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1402.3870
Jacob Khurgin B
Jacob B khurgin
Graphene - a rather ordinary nonlinear optical material
null
null
10.1063/1.4873704
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An analytical expression for the nonlinear refractive index of graphene has been derived and used to obtain the performance metrics of third order nonlinear devices using graphene as a nonlinear medium. None of the metrics is found to be superior to the existing nonlinear optical materials.
[ { "created": "Mon, 17 Feb 2014 02:16:42 GMT", "version": "v1" } ]
2015-06-18
[ [ "khurgin", "Jacob B", "" ] ]
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1402.3873
Yutao Ma
Peng He, Bing Li, Xiao Liu, Jun Chen, and Yutao Ma
An Empirical Study on Software Defect Prediction with a Simplified Metric Set
24 pages, 9 figures, 13 tables
Information and Software Technology, 2015, 59(3): 170-190
10.1016/j.infsof.2014.11.006
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Software defect prediction plays a crucial role in estimating the most defect-prone components of software, and a large number of studies have pursued improving prediction accuracy within a project or across projects. However, the rules for making an appropriate decision between within- and cross-project defect prediction when available historical data are insufficient remain unclear. The objective of this work is to validate the feasibility of the predictor built with a simplified metric set for software defect prediction in different scenarios, and to investigate practical guidelines for the choice of training data, classifier and metric subset of a given project. First, based on six typical classifiers, we constructed three types of predictors using the size of software metric set in three scenarios. Then, we validated the acceptable performance of the predictor based on Top-k metrics in terms of statistical methods. Finally, we attempted to minimize the Top-k metric subset by removing redundant metrics, and we tested the stability of such a minimum metric subset with one-way ANOVA tests. The experimental results indicate that (1) the choice of training data should depend on the specific requirement of prediction accuracy; (2) the predictor built with a simplified metric set works well and is very useful in case limited resources are supplied; (3) simple classifiers (e.g., Naive Bayes) also tend to perform well when using a simplified metric set for defect prediction; and (4) in several cases, the minimum metric subset can be identified to facilitate the procedure of general defect prediction with acceptable loss of prediction precision in practice. The guideline for choosing a suitable simplified metric set in different scenarios is presented in Table 12.
[ { "created": "Mon, 17 Feb 2014 02:29:16 GMT", "version": "v1" }, { "created": "Fri, 28 Feb 2014 06:02:24 GMT", "version": "v2" }, { "created": "Fri, 1 Aug 2014 05:09:14 GMT", "version": "v3" }, { "created": "Wed, 24 Dec 2014 15:53:35 GMT", "version": "v4" } ]
2020-04-28
[ [ "He", "Peng", "" ], [ "Li", "Bing", "" ], [ "Liu", "Xiao", "" ], [ "Chen", "Jun", "" ], [ "Ma", "Yutao", "" ] ]
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1402.3876
William Pettersson
Benjamin A. Burton and William Pettersson
Fixed parameter tractable algorithms in combinatorial topology
16 pages, 9 figures
Lecture Notes in Computer Science, vol. 8591, 2014, pp. 300-311
10.1007/978-3-319-08783-2_26
null
math.GT cs.CG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
To enumerate 3-manifold triangulations with a given property, one typically begins with a set of potential face pairing graphs (also known as dual 1-skeletons), and then attempts to flesh each graph out into full triangulations using an exponential-time enumeration. However, asymptotically most graphs do not result in any 3-manifold triangulation, which leads to significant "wasted time" in topological enumeration algorithms. Here we give a new algorithm to determine whether a given face pairing graph supports any 3-manifold triangulation, and show this to be fixed parameter tractable in the treewidth of the graph. We extend this result to a "meta-theorem" by defining a broad class of properties of triangulations, each with a corresponding fixed parameter tractable existence algorithm. We explicitly implement this algorithm in the most generic setting, and we identify heuristics that in practice are seen to mitigate the large constants that so often occur in parameterised complexity, highlighting the practicality of our techniques.
[ { "created": "Mon, 17 Feb 2014 03:06:07 GMT", "version": "v1" }, { "created": "Mon, 5 May 2014 00:33:58 GMT", "version": "v2" } ]
2014-07-25
[ [ "Burton", "Benjamin A.", "" ], [ "Pettersson", "William", "" ] ]
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1402.3877
Angel S. Sanz
A. S. Sanz
Particles, waves and trajectories: 210 years after Young's experiment
14 pages, 4 figures; based on a talk at the Conference "Emergent Quantum Mechanics" (Vienna, Oct 3-6, 2013)
J. Phys.: Conf. Ser. 504, 012028 (2014)
10.1088/1742-6596/504/1/012028
null
quant-ph physics.hist-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Mermin's "shut up and calculate!" somehow summarizes the most widely accepted view on quantum mechanics. This conception has led to a rather constraining way to think and understand the quantum world. Nonetheless, a closer look at the principles and formal body of this theory shows that, beyond longstanding prejudices, there is still room enough for alternative tools. This is the case, for example, of Bohmian mechanics. As it is discussed here, there is nothing contradictory or wrong with this hydrodynamical representation, which enhances the dynamical role of the quantum phase to the detriment (to some extent) of the probability density. The possibility to describe the evolution of quantum systems in terms of trajectories or streamlines is just a direct consequence of the fact that Bohmian mechanics (quantum hydrodynamics) is just a way to recast quantum mechanics in the more general language of the theory of characteristics. Misconceptions concerning Bohmian mechanics typically come from the fact that many times it is taken out of context and considered as an alternative theory to quantum mechanics, which is not the case. On the contrary, an appropriate contextualization shows that Bohmian mechanics constitutes a serious and useful representation of quantum mechanics, at the same level as any other quantum picture, such as Schr\"odinger's, Heisenberg's, Dirac's, or Feynman's, for instance. To illustrate its versatility, two phenomena will be briefly considered, namely dissipation and light interference.
[ { "created": "Mon, 17 Feb 2014 03:06:31 GMT", "version": "v1" } ]
2014-04-17
[ [ "Sanz", "A. S.", "" ] ]
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1402.3878
Angel S. Sanz
A. S. Sanz
Effective Markovian description of decoherence in bound systems
12 pages, 9 figures
Can. J. Chem. 92, 168 (2014)
10.1139/cjc-2013-0399
null
quant-ph physics.chem-ph physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Effective descriptions accounting for the evolution of quantum systems that are acted on by a bath are desirable. As the number of bath degrees of freedom increases and full quantum simulations turn out computationally prohibitive, simpler models become essential to understand and gain an insight into the main physical mechanisms involved in the system dynamics. In this regard, vibrational decoherence of an I$_2$ diatomics is tackled here within the framework of Markovian quantum state diffusion. The I$_2$ dynamics are analyzed in terms of an effective decoherence rate, $\Lambda$, and the specific choice of the initial state, in particular, Gaussian wave packets and two-state superpositions. It is found that, for Markovian baths, the relevant quantity regarding decoherence is the product of friction ($\eta$) and temperature ($T$); there is no distinction between varying one or the other. It is also observed that decoherence becomes faster as the energy levels involved in the system state correspond to higher eigenvalues. This effect is due to a population redistribution during the dynamical process and an eventual irreversible loss of the initial coherence. These results have been compared with those available in the literature from more detailed semiclassical IVR simulations, finding a good agreement.
[ { "created": "Mon, 17 Feb 2014 03:08:19 GMT", "version": "v1" } ]
2014-02-18
[ [ "Sanz", "A. S.", "" ] ]
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1402.3885
Angel S. Sanz
A. S. Sanz, M. Davidovic, M. Bozic
Full quantum mechanical analysis of atomic three-grating Mach-Zehnder interferometry
17 pages, 6 figures (remarkably improved version)
Ann. Phys. 353, 205 (2015)
10.1016/j.aop.2014.11.012
null
physics.atom-ph physics.chem-ph physics.optics quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Atomic three-grating Mach-Zehnder interferometry constitutes an important tool to probe fundamental aspects of the quantum theory. There is, however, a remarkable gap in the literature between the oversimplified models and robust numerical simulations considered to describe the corresponding experiments. Consequently, the former usually lead to paradoxical scenarios, such as the wave-particle dual behavior of atoms, while the latter make difficult the data analysis in simple terms. Here these issues are tackled by means of a simple grating working model consisting of evenly-spaced Gaussian slits. As is shown, this model suffices to explore and explain such experiments both analytically and numerically, giving a good account of the full atomic journey inside the interferometer, and hence contributing to make less mystic the physics involved. More specifically, it provides a clear and unambiguous picture of the wavefront splitting that takes place inside the interferometer, illustrating how the momentum along each emerging diffraction order is well defined even though the wave function itself still displays a rather complex shape. To this end, the local transverse momentum is also introduced in this context as a reliable analytical tool. The splitting, apart from being a key issue to understand atomic Mach-Zehnder interferometry, also demonstrates at a fundamental level how wave and particle aspects are always present in the experiment, without incurring in any contradiction or interpretive paradox. On the other hand, at a practical level, the generality and versatility of the model and methodology presented, makes them suitable to attack analogous problems in a simple manner after a convenient tuning.
[ { "created": "Mon, 17 Feb 2014 03:57:03 GMT", "version": "v1" }, { "created": "Wed, 7 Jan 2015 11:37:39 GMT", "version": "v2" } ]
2015-01-08
[ [ "Sanz", "A. S.", "" ], [ "Davidovic", "M.", "" ], [ "Bozic", "M.", "" ] ]
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1402.3890
Michal Brzezinski
Michal Brzezinski
Power laws in citation distributions: Evidence from Scopus
18 pages, 1 figure
null
null
null
cs.DL physics.soc-ph stat.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Modeling distributions of citations to scientific papers is crucial for understanding how science develops. However, there is a considerable empirical controversy on which statistical model fits the citation distributions best. This paper is concerned with rigorous empirical detection of power-law behaviour in the distribution of citations received by the most highly cited scientific papers. We have used a large, novel data set on citations to scientific papers published between 1998 and 2002 drawn from Scopus. The power-law model is compared with a number of alternative models using a likelihood ratio test. We have found that the power-law hypothesis is rejected for around half of the Scopus fields of science. For these fields of science, the Yule, power-law with exponential cut-off and log-normal distributions seem to fit the data better than the pure power-law model. On the other hand, when the power-law hypothesis is not rejected, it is usually empirically indistinguishable from most of the alternative models. The pure power-law model seems to be the best model only for the most highly cited papers in "Physics and Astronomy". Overall, our results seem to support theories implying that the most highly cited scientific papers follow the Yule, power-law with exponential cut-off or log-normal distribution. Our findings suggest also that power laws in citation distributions, when present, account only for a very small fraction of the published papers (less than 1% for most of science fields) and that the power-law scaling parameter (exponent) is substantially higher (from around 3.2 to around 4.7) than found in the older literature.
[ { "created": "Mon, 17 Feb 2014 05:17:29 GMT", "version": "v1" } ]
2014-02-18
[ [ "Brzezinski", "Michal", "" ] ]
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1402.3891
Vinodhini G
Vinodhini G Chandrasekaran RM
Performance Evaluation of Machine Learning Classifiers in Sentiment Mining
4 pages 2 tables, International Journal of Computer Trends and Technology, volume 4, Issue 6, june 2013
null
null
null
cs.LG cs.CL cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In recent years, the use of machine learning classifiers is of great value in solving a variety of problems in text classification. Sentiment mining is a kind of text classification in which, messages are classified according to sentiment orientation such as positive or negative. This paper extends the idea of evaluating the performance of various classifiers to show their effectiveness in sentiment mining of online product reviews. The product reviews are collected from Amazon reviews. To evaluate the performance of classifiers various evaluation methods like random sampling, linear sampling and bootstrap sampling are used. Our results shows that support vector machine with bootstrap sampling method outperforms others classifiers and sampling methods in terms of misclassification rate.
[ { "created": "Mon, 17 Feb 2014 05:24:42 GMT", "version": "v1" } ]
2014-02-18
[ [ "RM", "Vinodhini G Chandrasekaran", "" ] ]
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1402.3892
Nasri Othman
Nasri Bin Othman, Erika Fille Legara, Vicknesh Selvam, Christopher Monterola
Simulating Congestion Dynamics of Train Rapid Transit using Smart Card Data
10 pages, 5 figures, submitted to International Conference on Computational Science 2014
null
null
null
cs.MA physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Investigating congestion in train rapid transit systems (RTS) in today's urban cities is a challenge compounded by limited data availability and difficulties in model validation. Here, we integrate information from travel smart card data, a mathematical model of route choice, and a full-scale agent-based model of the Singapore RTS to provide a more comprehensive understanding of the congestion dynamics than can be obtained through analytical modelling alone. Our model is empirically validated, and allows for close inspection of the dynamics including station crowdedness, average travel duration, and frequency of missed trains---all highly pertinent factors in service quality. Using current data, the crowdedness in all 121 stations appears to be distributed log-normally. In our preliminary scenarios, we investigate the effect of population growth on service quality. We find that the current population (2 million) lies below a critical point; and increasing it beyond a factor of $\sim10\%$ leads to an exponential deterioration in service quality. We also predict that incentivizing commuters to avoid the most congested hours can bring modest improvements to the service quality provided the population remains under the critical point. Finally, our model can be used to generate simulated data for analytical modelling when such data are not empirically available, as is often the case.
[ { "created": "Mon, 17 Feb 2014 05:26:47 GMT", "version": "v1" } ]
2014-02-18
[ [ "Othman", "Nasri Bin", "" ], [ "Legara", "Erika Fille", "" ], [ "Selvam", "Vicknesh", "" ], [ "Monterola", "Christopher", "" ] ]
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1402.3895
Karthikeyan Shanmugam
Karthikeyan Shanmugam and Alexandros G. Dimakis
Bounding Multiple Unicasts through Index Coding and Locally Repairable Codes
6 pages, 2 figures.Submitted to ISIT 2014
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null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We establish a duality result between linear index coding and Locally Repairable Codes (LRCs). Specifically, we show that a natural extension of LRCs we call Generalized Locally Repairable Codes (GLCRs) are exactly dual to linear index codes. In a GLRC, every node is decodable from a specific set of other nodes and these sets induce a recoverability directed graph. We show that the dual linear subspace of a GLRC is a solution to an index coding instance where the side information graph is this GLRC recoverability graph. We show that the GLRC rate is equivalent to the complementary index coding rate, i.e. the number of transmissions saved by coding. Our second result uses this duality to establish a new upper bound for the multiple unicast network coding problem. In multiple unicast network coding, we are given a directed acyclic graph and r sources that want to send independent messages to r corresponding destinations. Our new upper bound is efficiently computable and relies on a strong approximation result for complementary index coding. We believe that our bound could lead to a logarithmic approximation factor for multiple unicast network coding if a plausible connection we state is verified.
[ { "created": "Mon, 17 Feb 2014 05:38:58 GMT", "version": "v1" } ]
2014-02-18
[ [ "Shanmugam", "Karthikeyan", "" ], [ "Dimakis", "Alexandros G.", "" ] ]
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1402.3897
Thomas Buettner Mr
Thomas F. S. Buettner, Irina V. Kabakova, Darren D. Hudson, Ravi Pant, Christopher G. Poulton, Alexander C. Judge, and Benjamin J. Eggleton
Phase-locking in Multi-Frequency Brillouin Oscillator via Four Wave Mixing
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null
null
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physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Stimulated Brillouin scattering (SBS) and Kerr-nonlinear four wave-mixing (FWM) are among the most important and widely studied nonlinear effects in optical fibres. At high powers SBS can be cascaded producing multiple Stokes waves spaced by the Brillouin frequency shift. Here, we investigate the complex nonlinear interaction of the cascade of Stokes waves, generated in a Fabry-Perot chalcogenide fibre resonator through the combined action of SBS and FWM. We demonstrate the existence of parameter regimes, in which pump and Stokes waves attain a phase-locked steady state. Real-time measurements of 40ps pulses with 8GHz repetition rate are presented, confirming short-and long-term stability. Numerical simulations qualitatively agree with experiments and show the significance of FWM in phase-locking of pump and Stokes waves. Our findings can be applied for the design of novel picosecond pulse sources with GHz repetition rate for optical communication systems.
[ { "created": "Mon, 17 Feb 2014 05:41:11 GMT", "version": "v1" } ]
2014-02-18
[ [ "Buettner", "Thomas F. S.", "" ], [ "Kabakova", "Irina V.", "" ], [ "Hudson", "Darren D.", "" ], [ "Pant", "Ravi", "" ], [ "Poulton", "Christopher G.", "" ], [ "Judge", "Alexander C.", "" ], [ "Eggleton", "Benjamin J.", "" ] ]
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1402.3898
Karthikeyan Shanmugam
Karthikeyan Shanmugam, Alexandros G. Dimakis and Michael Langberg
Graph Theory versus Minimum Rank for Index Coding
8 pages, 2 figures. Submitted to ISIT 2014
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We obtain novel index coding schemes and show that they provably outperform all previously known graph theoretic bounds proposed so far. Further, we establish a rather strong negative result: all known graph theoretic bounds are within a logarithmic factor from the chromatic number. This is in striking contrast to minrank since prior work has shown that it can outperform the chromatic number by a polynomial factor in some cases. The conclusion is that all known graph theoretic bounds are not much stronger than the chromatic number.
[ { "created": "Mon, 17 Feb 2014 05:46:43 GMT", "version": "v1" } ]
2014-02-18
[ [ "Shanmugam", "Karthikeyan", "" ], [ "Dimakis", "Alexandros G.", "" ], [ "Langberg", "Michael", "" ] ]
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1402.3899
Martin Castelnovo
Martin Castelnovo (Phys-ENS), Timoth\'ee Verdier (Phys-ENS), Lionel Foret (LPS)
Comparing open and closed molecular self-assembly
PACS 81.16.Fg - Supramolecular and biochemical assembly PACS 82.39.-k - Chemical kinetics in biological systems PACS 05.65.+b - Self-organized systems
Europhysics Letterss, 105 (2014) 28006
10.1209/0295-5075/105/28006
null
physics.bio-ph cond-mat.soft q-bio.BM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study theoretically in the present work the self-assembly of molecules in an open system, which is fed by monomers and depleted in partial or complete clusters. Such a scenario is likely to occur for example in the context of viral self-assembly. We provide a general formula for the mean-field size distribution which is valid both at equilibrium in a closed system, and in the stationary state in an open system. This allows us to explore in a simple way out-of-equilibrium features for self-assembly and compare them to equilibrium properties. In particular, we identify a region of parameter space for which the out-of-equilibrium size distribution in the presence of external fluxes is equal to the equilibrium size distribution in the absence of external fluxes, up to a constant renormalization factor. The range of validity of this result and its consequences are discussed.
[ { "created": "Mon, 17 Feb 2014 05:52:46 GMT", "version": "v1" } ]
2014-02-18
[ [ "Castelnovo", "Martin", "", "Phys-ENS" ], [ "Verdier", "Timothée", "", "Phys-ENS" ], [ "Foret", "Lionel", "", "LPS" ] ]
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1402.3902
Karthikeyan Shanmugam
Murat Kocaoglu, Karthikeyan Shanmugam, Alexandros G. Dimakis and Adam Klivans
Sparse Polynomial Learning and Graph Sketching
14 pages; to appear in NIPS 2014l Updated proof of Theorem 5 and some other minor changes during revision
null
null
null
cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $f:\{-1,1\}^n$ be a polynomial with at most $s$ non-zero real coefficients. We give an algorithm for exactly reconstructing f given random examples from the uniform distribution on $\{-1,1\}^n$ that runs in time polynomial in $n$ and $2s$ and succeeds if the function satisfies the unique sign property: there is one output value which corresponds to a unique set of values of the participating parities. This sufficient condition is satisfied when every coefficient of f is perturbed by a small random noise, or satisfied with high probability when s parity functions are chosen randomly or when all the coefficients are positive. Learning sparse polynomials over the Boolean domain in time polynomial in $n$ and $2s$ is considered notoriously hard in the worst-case. Our result shows that the problem is tractable for almost all sparse polynomials. Then, we show an application of this result to hypergraph sketching which is the problem of learning a sparse (both in the number of hyperedges and the size of the hyperedges) hypergraph from uniformly drawn random cuts. We also provide experimental results on a real world dataset.
[ { "created": "Mon, 17 Feb 2014 06:00:16 GMT", "version": "v1" }, { "created": "Tue, 18 Feb 2014 06:56:27 GMT", "version": "v2" }, { "created": "Wed, 5 Nov 2014 22:35:40 GMT", "version": "v3" }, { "created": "Fri, 7 Nov 2014 03:00:28 GMT", "version": "v4" } ]
2014-11-10
[ [ "Kocaoglu", "Murat", "" ], [ "Shanmugam", "Karthikeyan", "" ], [ "Dimakis", "Alexandros G.", "" ], [ "Klivans", "Adam", "" ] ]
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1402.3909
Fahad Panolan
Fedor V. Fomin, Daniel Lokshtanov, Fahad Panolan, Saket Saurabh
Representative Sets of Product Families
arXiv admin note: substantial text overlap with arXiv:1304.4626
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null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A subfamily ${\cal F}'$ of a set family ${\cal F}$ is said to $q$-{\em represent} ${\cal F}$ if for every $A \in {\cal F}$ and $B$ of size $q$ such that $A \cap B = \emptyset$ there exists a set $A' \in {\cal F}'$ such that $A' \cap B = \emptyset$. In this paper, we consider the efficient computation of $q$-representative sets for {\em product} families ${\cal F}$. A family ${\cal F}$ is a product family if there exist families ${\cal A}$ and ${\cal B}$ such that ${\cal F} = \{A \cup B~:~A \in {\cal A}, B \in {\cal B}, A \cap B = \emptyset\}$. Our main technical contribution is an algorithm which given ${\cal A}$, ${\cal B}$ and $q$ computes a $q$-representative family ${\cal F}'$ of ${\cal F}$. The running time of our algorithm is sublinear in $|{\cal F}|$ for many choices of ${\cal A}$, ${\cal B}$ and $q$ which occur naturally in several dynamic programming algorithms. We also give an algorithm for the computation of $q$-representative sets for product families ${\cal F}$ in the more general setting where $q$-representation also involves independence in a matroid in addition to disjointness. This algorithm considerably outperforms the naive approach where one first computes ${\cal F}$ from ${\cal A}$ and ${\cal B}$, and then computes the $q$-representative family ${\cal F}'$ from ${\cal F}$. We give two applications of our new algorithms for computing $q$-representative sets for product families. The first is a $3.8408^{k}n^{O(1)}$ deterministic algorithm for the Multilinear Monomial Detection ($k$-MlD) problem. The second is a significant improvement of deterministic dynamic programming algorithms for "connectivity problems" on graphs of bounded treewidth.
[ { "created": "Mon, 17 Feb 2014 06:55:42 GMT", "version": "v1" } ]
2014-02-18
[ [ "Fomin", "Fedor V.", "" ], [ "Lokshtanov", "Daniel", "" ], [ "Panolan", "Fahad", "" ], [ "Saurabh", "Saket", "" ] ]
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1402.3911
Dmitry Markovich L
Dmitry L. Markovich, Pavel Ginzburg, Anton Samusev, Pavel A. Belov, and Anatoly V. Zayats
Magnetic dipole radiation tailored by substrates: numerical investigation
10 page, 28 figures
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physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Nanoparticles of high refractive index materials can possess strong magnetic polarizabilities and give rise to artificial magnetism in the optical spectral range. While the response of individual dielectric or metal spherical particles can be described analytically via multipole decomposition in the Mie series, the influence of substrates, in many cases present in experimental observations, requires different approaches. Here, the comprehensive numerical studies of the influence of a substrate on the spectral response of high- index dielectric nanoparticles were performed. In particular, glass, perfect electric conductor, gold, and hyperbolic metamaterial substrates were investigated. Optical properties of nanoparticles were characterized via scattering cross-section spectra, electric field profiles, and induced electric and magnetic moments. The presence of substrates was shown to introduce significant impact on particle's magnetic resonances and resonant scattering cross-sections. Variation of substrate material provides an additional degree of freedom in tailoring properties of emission of magnetic multipoles, important in many applications.
[ { "created": "Mon, 17 Feb 2014 07:02:37 GMT", "version": "v1" } ]
2014-02-18
[ [ "Markovich", "Dmitry L.", "" ], [ "Ginzburg", "Pavel", "" ], [ "Samusev", "Anton", "" ], [ "Belov", "Pavel A.", "" ], [ "Zayats", "Anatoly V.", "" ] ]
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1402.3913
Li Qian
Li Qian, Lizhen Liu, Yue Hu
Analysis of Personalized Information Service System for Digital Libraries
null
null
null
null
cs.DL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Along with the rapid development of digital library, digital library of the third generation, taking the main characteristics of the personalized service, has already become the mainstream today. This article first analyzes the concept and characteristics of digital library, then elaborates the inevitability of personalized service as well as the necessity of its development and based on the Propose of establishing interested knowledge-base, enumerates several ways of personalized service, at last according to individualized service, this paper proposes the model of "learningoriented individual digital library" and prospects the trends of digital library.
[ { "created": "Mon, 17 Feb 2014 07:17:56 GMT", "version": "v1" } ]
2014-02-18
[ [ "Qian", "Li", "" ], [ "Liu", "Lizhen", "" ], [ "Hu", "Yue", "" ] ]
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1402.3915
Tak Chu Li
T.C. Li, J.F. Drake and M. Swisdak
Coronal Electron Confinement by Double Layers
null
2013, ApJ, 778, 144
10.1088/0004-637X/778/2/144
null
physics.plasm-ph astro-ph.SR physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In observations of flare-heated electrons in the solar corona, a longstanding problem is the unexplained prolonged lifetime of the electrons compared to their transit time across the source. This suggests confinement. Recent particle-in-cell (PIC) simulations, which explored the transport of pre-accelerated hot electrons through ambient cold plasma, showed that the formation of a highly localized electrostatic potential drop, in the form of a double layer (DL), significantly inhibited the transport of hot electrons (T.C. Li, J.F. Drake, and M. Swisdak, 2012, ApJ, 757, 20). The effectiveness of confinement by a DL is linked to the strength of the DL as defined by its potential drop. In this work, we investigate the scaling of the DL strength with the hot electron temperature by PIC simulations, and find a linear scaling. We demonstrate that the strength is limited by the formation of parallel shocks. Based on this, we analytically determine the maximum DL strength, and find also a linear scaling with the hot electron temperature. The DL strength obtained from the analytic calculation is comparable to that from the simulations. At the maximum strength, the DL is capable of confining a significant fraction of hot electrons in the source.
[ { "created": "Mon, 17 Feb 2014 07:32:27 GMT", "version": "v1" } ]
2014-02-18
[ [ "Li", "T. C.", "" ], [ "Drake", "J. F.", "" ], [ "Swisdak", "M.", "" ] ]
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1402.3918
Brian Odom
Chien-Yu Lien, Christopher M. Seck, Yen-Wei Lin, Jason H. V. Nguyen, David A. Tabor, Brian C. Odom
Broadband optical cooling of molecular rotors from room temperature to the ground state
null
Nature Communications 5, 4783 (2014)
10.1038/ncomms5783
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Laser cycling of resonances can remove entropy from a system via spontaneously emitted photons, with electronic resonances providing the fastest cooling timescales because of their rapid relaxation rates. Although atoms are routinely laser cooled, even simple molecules pose two interrelated challenges for cooling: every populated rotational-vibrational state requires a different laser frequency, and electronic relaxation generally excites vibrations. Here, we cool trapped AlH+ molecules to their ground rotational-vibrational quantum state using an electronically-exciting broadband laser to simultaneously drive cooling resonances from many different rotational levels. Undesired vibrational excitation is avoided because of vibrational-electronic decoupling in AlH+. We demonstrate rotational cooling on the 140(20) ms timescale from room temperature to 3.8(+0.9/-0.3) K, with the ground state population increasing from ~3% to 95.4(+1.3/-2.0) %. This cooling technique could be applied to several other neutral and charged molecular species useful for quantum information processing, ultracold chemistry applications, and precision tests of fundamental symmetries.
[ { "created": "Mon, 17 Feb 2014 07:43:18 GMT", "version": "v1" }, { "created": "Thu, 20 Feb 2014 00:38:37 GMT", "version": "v2" }, { "created": "Fri, 21 Feb 2014 17:21:21 GMT", "version": "v3" }, { "created": "Mon, 7 Apr 2014 14:49:03 GMT", "version": "v4" }, { "created": "Sat, 19 Apr 2014 21:05:17 GMT", "version": "v5" }, { "created": "Sat, 10 May 2014 21:36:55 GMT", "version": "v6" }, { "created": "Fri, 30 May 2014 03:22:24 GMT", "version": "v7" }, { "created": "Tue, 12 Aug 2014 19:32:27 GMT", "version": "v8" }, { "created": "Fri, 10 Apr 2015 02:30:28 GMT", "version": "v9" } ]
2020-08-07
[ [ "Lien", "Chien-Yu", "" ], [ "Seck", "Christopher M.", "" ], [ "Lin", "Yen-Wei", "" ], [ "Nguyen", "Jason H. V.", "" ], [ "Tabor", "David A.", "" ], [ "Odom", "Brian C.", "" ] ]
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1402.3920
Kleanthis Thramboulidis
Kleanthis Thramboulidis
A Framework for the Implementation of Industrial Automation Systems Based on PLCs
13 pages, 9 figures Corrected typos. Corrections to Fig. 5a and 9. results unchanged
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null
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cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Industrial automation systems (IASs) are traditionally developed using a sequential approach where the automation software, which is commonly based on the IEC 61131 languages, is developed when the design and in many cases the implementation of mechanical parts have been completed. However, it is claimed that this approach does not lead to the optimal system design and that the IEC 61131 does not meet new challenges in this domain. In this paper, a system engineering process based on the new version of IEC 61131, which supports Object Orientation, is presented. SysML and UML are utilized to introduce a higher layer of abstraction in the design space of IAS and Internet of Things (IoT) is considered as an enabling technology for the integration of Cyber and Cyber-physical components of the system, bringing into the industrial automation domain the benefits of these technologies.
[ { "created": "Mon, 17 Feb 2014 07:59:49 GMT", "version": "v1" }, { "created": "Mon, 23 Jun 2014 09:06:17 GMT", "version": "v2" } ]
2014-06-24
[ [ "Thramboulidis", "Kleanthis", "" ] ]
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1402.3926
Hideitsu Hino
Toshiyuki Kato, Hideitsu Hino, and Noboru Murata
Sparse Coding Approach for Multi-Frame Image Super Resolution
null
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An image super-resolution method from multiple observation of low-resolution images is proposed. The method is based on sub-pixel accuracy block matching for estimating relative displacements of observed images, and sparse signal representation for estimating the corresponding high-resolution image. Relative displacements of small patches of observed low-resolution images are accurately estimated by a computationally efficient block matching method. Since the estimated displacements are also regarded as a warping component of image degradation process, the matching results are directly utilized to generate low-resolution dictionary for sparse image representation. The matching scores of the block matching are used to select a subset of low-resolution patches for reconstructing a high-resolution patch, that is, an adaptive selection of informative low-resolution images is realized. When there is only one low-resolution image, the proposed method works as a single-frame super-resolution method. The proposed method is shown to perform comparable or superior to conventional single- and multi-frame super-resolution methods through experiments using various real-world datasets.
[ { "created": "Mon, 17 Feb 2014 08:23:35 GMT", "version": "v1" } ]
2014-02-18
[ [ "Kato", "Toshiyuki", "" ], [ "Hino", "Hideitsu", "" ], [ "Murata", "Noboru", "" ] ]
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1402.3928
Santosh Arvind Adimoolam
Santosh Arvind Adimoolam
Parametrization of completeness in symbolic abstraction of bounded input linear systems
null
null
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A good state-time quantized symbolic abstraction of an already input quantized control system would satisfy three conditions: proximity, soundness and completeness. Extant approaches for symbolic abstraction of unstable systems limit to satisfying proximity and soundness but not completeness. Instability of systems is an impediment to constructing fully complete state-time quantized symbolic models for bounded and quantized input unstable systems, even using supervisory feedback. Therefore, in this paper we come up with a way of parametrization of completeness of the symbolic model through the quintessential notion of Trimmed-Input Approximate Bisimulation which is introduced in the paper. The amount of completeness is specified by a parameter called trimming of the set of input trajectories. We subsequently discuss a procedure of constructing state-time quantized symbolic models which are near-complete in addition to being sound and proximate with respect to the time quantized models.
[ { "created": "Mon, 17 Feb 2014 08:33:30 GMT", "version": "v1" } ]
2014-02-18
[ [ "Adimoolam", "Santosh Arvind", "" ] ]
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1402.3937
Ahmad Haboush Dr
Ahmad Khader Haboush
A Hybrid Modified Semantic Matching Algorithm Based on Instances Detection With Case Study on Renewable Energy
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null
null
null
cs.SE
http://creativecommons.org/licenses/by-nc-sa/3.0/
This Matching input keywords with historical or information domain is an important point in modern computations in order to find the best match information domain for specific input queries. Matching algorithms represents hot area of researches in computer science and artificial intelligence. In the area of text matching, it is more reliable to study semantics of the pattern and query in terms of semantic matching. This paper improves the semantic matching results between input queries and information ontology domain. The contributed algorithm is a hybrid technique that is based on matching extracted instances from booth, the queries and in information domain. The instances extraction algorithm that is presented in this paper are contributed which is based on mathematical and statistical analysis of objects with respect to each other and also with respect to marked objects. The instances that are instances from the queries and information domain are subjected to semantic matching to find the best match, match percentage, and to improve the decision making process. An application case was studied in this paper which is related to renewable energy, where the input queries represents the customer requirements input and the knowledge domain is renewable energy vendors profiles. The comparison was made with most known recent matching researches.
[ { "created": "Mon, 17 Feb 2014 09:29:02 GMT", "version": "v1" } ]
2014-02-18
[ [ "Haboush", "Ahmad Khader", "" ] ]
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1402.3939
Suqi Cheng
Suqi Cheng, Hua-Wei Shen, Junming Huang, Wei Chen, Xue-Qi Cheng
IMRank: Influence Maximization via Finding Self-Consistent Ranking
10 pages, 8 figures, this paper has been submitted to SIGIR2014
null
null
null
cs.SI cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Influence maximization, fundamental for word-of-mouth marketing and viral marketing, aims to find a set of seed nodes maximizing influence spread on social network. Early methods mainly fall into two paradigms with certain benefits and drawbacks: (1)Greedy algorithms, selecting seed nodes one by one, give a guaranteed accuracy relying on the accurate approximation of influence spread with high computational cost; (2)Heuristic algorithms, estimating influence spread using efficient heuristics, have low computational cost but unstable accuracy. We first point out that greedy algorithms are essentially finding a self-consistent ranking, where nodes' ranks are consistent with their ranking-based marginal influence spread. This insight motivates us to develop an iterative ranking framework, i.e., IMRank, to efficiently solve influence maximization problem under independent cascade model. Starting from an initial ranking, e.g., one obtained from efficient heuristic algorithm, IMRank finds a self-consistent ranking by reordering nodes iteratively in terms of their ranking-based marginal influence spread computed according to current ranking. We also prove that IMRank definitely converges to a self-consistent ranking starting from any initial ranking. Furthermore, within this framework, a last-to-first allocating strategy and a generalization of this strategy are proposed to improve the efficiency of estimating ranking-based marginal influence spread for a given ranking. In this way, IMRank achieves both remarkable efficiency and high accuracy by leveraging simultaneously the benefits of greedy algorithms and heuristic algorithms. As demonstrated by extensive experiments on large scale real-world social networks, IMRank always achieves high accuracy comparable to greedy algorithms, with computational cost reduced dramatically, even about $10-100$ times faster than other scalable heuristics.
[ { "created": "Mon, 17 Feb 2014 09:33:15 GMT", "version": "v1" } ]
2014-02-18
[ [ "Cheng", "Suqi", "" ], [ "Shen", "Hua-Wei", "" ], [ "Huang", "Junming", "" ], [ "Chen", "Wei", "" ], [ "Cheng", "Xue-Qi", "" ] ]
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1402.3941
Jonathan Scarlett
Jonathan Scarlett and Alfonso Martinez and Albert Guill\'en i F\`abregas
The Saddlepoint Approximation: Unified Random Coding Asymptotics for Fixed and Varying Rates
Accepted to ISIT 2014, presented without publication at ITA 2014
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a saddlepoint approximation of the random-coding union bound of Polyanskiy et al. for i.i.d. random coding over discrete memoryless channels. The approximation is single-letter, and can thus be computed efficiently. Moreover, it is shown to be asymptotically tight for both fixed and varying rates, unifying existing achievability results in the regimes of error exponents, second-order coding rates, and moderate deviations. For fixed rates, novel exact-asymptotics expressions are specified to within a multiplicative 1+o(1) term. A numerical example is provided for which the approximation is remarkably accurate even at short block lengths.
[ { "created": "Mon, 17 Feb 2014 09:44:19 GMT", "version": "v1" }, { "created": "Fri, 25 Apr 2014 12:32:14 GMT", "version": "v2" } ]
2014-04-28
[ [ "Scarlett", "Jonathan", "" ], [ "Martinez", "Alfonso", "" ], [ "Fàbregas", "Albert Guillén i", "" ] ]
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1402.3942
Nuttakan Pakprod Miss
Nuttakan Pakprod and Panita Wannapiroon
Development of Interactive Instructional Model Using Augmented Reality based on Edutainment to Enhance Emotional Quotient
8 pages
IJITE: Results Vol.2, No.4, December 2013 (43-50)
10.5121/ijite.2013.2405
null
cs.CY
http://creativecommons.org/licenses/by-nc-sa/3.0/
The research aims to develop an interactive instructional model using augmented reality based on edutainment to enhance emotional quotient and evaluate the model. Two phases of the research will be carried out: a development and an evaluation of the model. Samples are experts in the field of IT, child psychology, and 7th grade curriculum management. Ten experts are selected by purposive sampling method. The obtained data are analyzed using mean and standard deviation. The research result demonstrates the following findings: 1) The results of this research show that Model consists of 3 elements: IIAR, EduLA, and EQ. EQ is a means to assess EQ based on Time Series Experimental Design using 2 kinds of tools; i.e. EQ Assessment by programs in tablet computers, and EQ Assessment by behavioral observation. 2) The ten experts have evaluated the model and commented that the developed model showed high suitability.
[ { "created": "Mon, 17 Feb 2014 09:46:16 GMT", "version": "v1" } ]
2014-02-18
[ [ "Pakprod", "Nuttakan", "" ], [ "Wannapiroon", "Panita", "" ] ]
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1402.3944
J\"urgen M\"unch
J\"urgen M\"unch, Jens Heidrich
Context-driven Software Project Estimation
2 pages
Proceedings of the 2nd ACM-IEEE International Symposium on Empirical Software Engineering (ISESE 2003), volume 2, pages 15-16, Rome, Italy, September 20 - October 1 2003
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using quantitative data from past projects for software project estimation requires context knowledge that characterizes its origin and indicates its applicability for future use. This article sketches the SPRINT I technique for project planning and controlling. The underlying prediction mechanism is based on the identification of similar past projects and the building of so-called clusters with typical data curves. The article focuses on how to characterize these clusters with context knowledge and how to use context information from actual projects for prediction. The SPRINT approach is tool-supported and first evaluations have been conducted.
[ { "created": "Mon, 17 Feb 2014 09:53:10 GMT", "version": "v1" } ]
2014-02-18
[ [ "Münch", "Jürgen", "" ], [ "Heidrich", "Jens", "" ] ]
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1402.3946
Thierry Dudok de Wit
Thierry Dudok de Wit, Sean Bruinsma, and Kiyoto Shibasaki
Synoptic solar radio observations as proxies for upper atmosphere modelling
13 pages
Journal of Space Weather and Space Climate 4 (2014) A06
10.1051/swsc/2014003
null
astro-ph.SR physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The specification of the upper atmosphere strongly relies on solar proxies that can properly reproduce the solar energetic input in the UV. Whilst the microwave flux at 10.7 cm (also called F10.7 index) has been routinely used as a solar proxy, we show that the radio flux at other wavelengths provides valuable complementary information that enhances their value for upper atmospheric modelling. We merged daily observations from various observatories into a single homogeneous data set of fluxes at wavelengths of 30, 15, 10.7, 8 and 3.2 cm, spanning from 1957 to today. Using blind source separation (BSS), we show that their rotational modulation contains three contributions, which can be interpreted in terms of thermal bremsstrahlung and gyro-resonance emissions. The latter account for 90% of the rotational variability in the F10.7 index. Most solar proxies, such as the MgII index, are remarkably well reconstructed by simple linear combination of radio fluxes at various wavelengths. The flux at 30 cm stands out as an excellent proxy and is better suited than the F10.7 index for the modelling the thermosphere-ionosphere system, most probably because it receives a stronger contribution from thermal bremsstrahlung. This better performance is illustrated here through comparison between the observed thermospheric density, and reconstructions by the Drag Temperature Model.
[ { "created": "Mon, 17 Feb 2014 09:56:54 GMT", "version": "v1" } ]
2014-02-18
[ [ "de Wit", "Thierry Dudok", "" ], [ "Bruinsma", "Sean", "" ], [ "Shibasaki", "Kiyoto", "" ] ]
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1402.3951
Jeroen van der Ham PhD
Jeroen van der Ham and Mattijs Ghijsen and Paola Grosso and Cees de Laat
Trends in Computer Network Modeling Towards the Future Internet
null
null
null
null
cs.NI
http://creativecommons.org/licenses/by/3.0/
This article provides a taxonomy of current and past network modeling efforts. In all these efforts over the last few years we see a trend towards not only describing the network, but connected devices as well. This is especially current given the many Future Internet projects, which are combining different models, and resources in order to provide complete virtual infrastructures to users. An important mechanism for managing complexity is the creation of an abstract model, a step which has been undertaken in computer networks too. The fact that more and more devices are network capable, coupled with increasing popularity of the Internet, has made computer networks an important focus area for modeling. The large number of connected devices creates an increasing complexity which must be harnessed to keep the networks functioning. Over the years many different models for computer networks have been proposed, and used for different purposes. While for some time the community has moved away from the need of full topology exchange, this requirement resurfaced for optical networks. Subsequently, research on topology descriptions has seen a rise in the last few years. Many different models have been created and published, yet there is no publication that shows an overview of the different approaches.
[ { "created": "Mon, 17 Feb 2014 10:15:16 GMT", "version": "v1" }, { "created": "Wed, 5 Mar 2014 15:33:57 GMT", "version": "v2" } ]
2014-03-06
[ [ "van der Ham", "Jeroen", "" ], [ "Ghijsen", "Mattijs", "" ], [ "Grosso", "Paola", "" ], [ "de Laat", "Cees", "" ] ]
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1402.3954
Martin Castelnovo
Cendrine Faivre-Moskalenko (Phys-ENS), Julien Bernaud (Phys-ENS), Audrey Thomas (CPBS), Kevin Tartour, Yvonne Beck (Phys-ENS), Maksym Iazykov (Phys-ENS), John Danial (Phys-ENS), Morgane Lourdin, Delphine Muriaux (CPBS), Martin Castelnovo (Phys-ENS)
RNA Control of HIV-1 Particle Size Polydispersity
null
PLoS ONE 1, 9 (2014) e83874
10.1371/journal.pone.0083874
null
physics.bio-ph q-bio.BM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
HIV-1, an enveloped RNA virus, produces viral particles that are known to be much more heterogeneous in size than is typical of non-enveloped viruses. We present here a novel strategy to study HIV-1 Viral Like Particles (VLP) assembly by measuring the size distribution of these purified VLPs and subsequent viral cores thanks to Atomic Force Microscopy imaging and statistical analysis. This strategy allowed us to identify whether the presence of viral RNA acts as a modulator for VLPs and cores size heterogeneity in a large population of particles. These results are analyzed in the light of a recently proposed statistical physics model for the self-assembly process. In particular, our results reveal that the modulation of size distribution by the presence of viral RNA is qualitatively reproduced, suggesting therefore an entropic origin for the modulation of RNA uptake by the nascent VLP.
[ { "created": "Mon, 17 Feb 2014 10:21:45 GMT", "version": "v1" } ]
2014-02-18
[ [ "Faivre-Moskalenko", "Cendrine", "", "Phys-ENS" ], [ "Bernaud", "Julien", "", "Phys-ENS" ], [ "Thomas", "Audrey", "", "CPBS" ], [ "Tartour", "Kevin", "", "Phys-ENS" ], [ "Beck", "Yvonne", "", "Phys-ENS" ], [ "Iazykov", "Maksym", "", "Phys-ENS" ], [ "Danial", "John", "", "Phys-ENS" ], [ "Lourdin", "Morgane", "", "CPBS" ], [ "Muriaux", "Delphine", "", "CPBS" ], [ "Castelnovo", "Martin", "", "Phys-ENS" ] ]
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1402.3962
No\'emie Meunier
V\'eronique Bruy\`ere, No\'emie Meunier and Jean-Fran\c{c}ois Raskin
Secure Equilibria in Weighted Games
null
null
null
null
cs.GT cs.FL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider two-player non zero-sum infinite duration games played on weighted graphs. We extend the notion of secure equilibrium introduced by Chatterjee et al., from the Boolean setting to this quantitative setting. As for the Boolean setting, our notion of secure equilibrium refines the classical notion of Nash equilibrium. We prove that secure equilibria always exist in a large class of weighted games which includes common measures like sup, inf, lim sup, lim inf, mean-payoff, and discounted sum. Moreover we show that one can synthesize finite-memory strategy profiles with few memory. We also prove that the constrained existence problem for secure equilibria is decidable for sup, inf, lim sup, lim inf and mean-payoff measures. Our solutions rely on new results for zero-sum quantitative games with lexicographic objectives that are interesting on their own right.
[ { "created": "Mon, 17 Feb 2014 11:09:48 GMT", "version": "v1" }, { "created": "Mon, 12 May 2014 13:05:30 GMT", "version": "v2" }, { "created": "Fri, 30 Sep 2016 09:52:17 GMT", "version": "v3" } ]
2016-10-03
[ [ "Bruyère", "Véronique", "" ], [ "Meunier", "Noémie", "" ], [ "Raskin", "Jean-François", "" ] ]
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1402.3967
Salvatore Pascale
Salvatore Pascale and Valerio Lucarini and Xue Feng and Amilcare Porporato and Shabeh ul Hasson
Analysis of rainfall seasonality from observations and climate models
35 pages, 15 figures
null
10.1007/s00382-014-2278-2
null
physics.ao-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Two new indicators of rainfall seasonality based on information entropy, the relative entropy (RE) and the dimensionless seasonality index (DSI), together with the mean annual rainfall, are evaluated on a global scale for recently updated precipitation gridded datasets and for historical simulations from coupled atmosphere-ocean general circulation models. The RE provides a measure of the number of wet months and, for precipitation regimes featuring one maximum in the monthly rain distribution, it is related to the duration of the wet season. The DSI combines the rainfall intensity with its degree of seasonality and it is an indicator of the extent of the global monsoon region. We show that the RE and the DSI are fairly independent of the time resolution of the precipitation data, thereby allowing objective metrics for model intercomparison and ranking. Regions with different precipitation regimes are classified and characterized in terms of RE and DSI. Comparison of different land observational datasets reveals substantial difference in their local representation of seasonality. It is shown that two-dimensional maps of RE provide an easy way to compare rainfall seasonality from various datasets and to determine areas of interest. CMIP5 models consistently overestimate the RE over tropical Latin America and underestimate it in Western Africa and East Asia. It is demonstrated that positive RE biases in a GCM are associated with simulated monthly precipitation fractions which are too large during the wet months and too small in the months preceding the wet season; negative biases are instead due to an excess of rainfall during the dry months.
[ { "created": "Mon, 17 Feb 2014 11:32:26 GMT", "version": "v1" }, { "created": "Mon, 1 Sep 2014 15:12:14 GMT", "version": "v2" } ]
2014-09-02
[ [ "Pascale", "Salvatore", "" ], [ "Lucarini", "Valerio", "" ], [ "Feng", "Xue", "" ], [ "Porporato", "Amilcare", "" ], [ "Hasson", "Shabeh ul", "" ] ]
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1402.3973
Sjoerd Dirksen
Sjoerd Dirksen
Dimensionality reduction with subgaussian matrices: a unified theory
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cs.IT cs.DS math.IT stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a theory for Euclidean dimensionality reduction with subgaussian matrices which unifies several restricted isometry property and Johnson-Lindenstrauss type results obtained earlier for specific data sets. In particular, we recover and, in several cases, improve results for sets of sparse and structured sparse vectors, low-rank matrices and tensors, and smooth manifolds. In addition, we establish a new Johnson-Lindenstrauss embedding for data sets taking the form of an infinite union of subspaces of a Hilbert space.
[ { "created": "Mon, 17 Feb 2014 11:51:15 GMT", "version": "v1" } ]
2014-02-18
[ [ "Dirksen", "Sjoerd", "" ] ]
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1402.3982
Juhoon Kim
Juhoon Kim, Nadi Sarrar, Anja Feldmann
Watching the IPv6 Takeoff from an IXP's Viewpoint
Also appears as TU-Berlin technical report 2013-01, ISSN: 1436-9915
null
null
2014-01 (ISSN: 1436-9915)
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The different level of interest in deploying the new Internet address space across network operators has kept IPv6 tardy in its deployment. However, since the last block of IPv4 addresses has been assigned, Internet communities took the concern of the address space scarcity seriously and started to move forward actively. After the successful IPv6 test on 8 June, 2011 (World IPv6 Day [1]), network operators and service/content providers were brought together for preparing the next step of the IPv6 global deployment (World IPv6 Launch on 6 June, 2012 [2]). The main purpose of the event was to permanently enable their IPv6 connectivity. In this paper, based on the Internet traffic collected from a large European Internet Exchange Point (IXP), we present the status of IPv6 traffic mainly focusing on the periods of the two global IPv6 events. Our results show that IPv6 traffic is responsible for a small fraction such as 0.5 % of the total traffic in the peak period. Nevertheless, we are positively impressed by the facts that the increase of IPv6 traffic/prefixes shows a steep increase and that the application mix of IPv6 traffic starts to imitate the one of IPv4-dominated Internet.
[ { "created": "Mon, 17 Feb 2014 12:37:50 GMT", "version": "v1" } ]
2014-02-18
[ [ "Kim", "Juhoon", "" ], [ "Sarrar", "Nadi", "" ], [ "Feldmann", "Anja", "" ] ]
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1402.3985
Payaswini P
P Payaswini, D. H Manjaiah
Challenges and issues in 4G Networks Mobility Management
Wrongly uploaded file
International Journal of Computer Trends and Technology (IJCTT) volume 4 Issue 5 May 2013
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Wireless broadband technology is now in motion to provide higher data rate, wider coverage and improved mobility. Towards this the 4G - network is an integration of various wireless technologies and expected to provide seamless mobility. Moreover 4G-networks will be entirely packet switched systems based on IP protocol. One of the research challenges for 4G-Network is the design of intelligent mobility management techniques that take advantage of IP-based technologies to achieve global roaming among various access technologies. Hence Mobile IPv6 is considered to be one of the key technologies for integration of heterogeneous networks. However the original Mobile IPv6 does not support fast handover, which is essential function for mobile networks. Number of research groups working towards this to develop a common protocol to enable seamless mobility. In this paper we identify and explore the different issues and challenges related to mobility management in 4G - networks.
[ { "created": "Mon, 17 Feb 2014 12:54:34 GMT", "version": "v1" }, { "created": "Sun, 12 Dec 2021 08:31:32 GMT", "version": "v2" } ]
2021-12-14
[ [ "Payaswini", "P", "" ], [ "Manjaiah", "D. H", "" ] ]
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1402.3986
Samir Aknine
Samir Aknine
New Mechanism for Multiagent Extensible Negotiations
null
null
null
null
cs.MA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Multiagent negotiation mechanisms advise original solutions to several problems for which usual problem solving methods are inappropriate. Mainly negotiation models are based on agents' interactions through messages. Agents interact in order to reach an agreement for solving a specific problem. In this work, we study a new variant of negotiations, which has not yet been addressed in existing works. This negotiation form is denoted extensible negotiation. In contrast with current negotiation models, this form of negotiation allows the agents to dynamically extend the set of items under negotiation. This facility gives more acceptable solutions for the agents in their negotiation. The advantage of enlarging the negotiation space is to certainly offer more facilities for the agents for reaching new agreements which would not have been obtained using usual negotiation methods. This paper presents the protocol and the strategies used by the agents to deal with such negotiations.
[ { "created": "Mon, 17 Feb 2014 12:54:45 GMT", "version": "v1" } ]
2014-02-18
[ [ "Aknine", "Samir", "" ] ]
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1402.3987
Philippe Marcq
Philippe Marcq
Spatio-temporal dynamics of an active, polar, viscoelastic ring
9 pages, 4 figures
Eur. Phys. J. E 37:29 (2014)
10.1140/epje/i2014-14029-x
null
cond-mat.soft physics.bio-ph q-bio.QM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Constitutive equations for a one-dimensional, active, polar, viscoelastic liquid are derived by treating the strain field as a slow hydrodynamic variable. Taking into account the couplings between strain and polarity allowed by symmetry, the hydrodynamics of an active, polar, viscoelastic body include an evolution equation for the polarity field that generalizes the damped Kuramoto-Sivashinsky equation. Beyond thresholds of the active coupling coefficients between the polarity and the stress or the strain rate, bifurcations of the homogeneous state lead first to stationary waves, then to propagating waves of the strain, stress and polarity fields. I argue that these results are relevant to living matter, and may explain rotating actomyosin rings in cells and mechanical waves in epithelial cell monolayers.
[ { "created": "Mon, 17 Feb 2014 12:56:16 GMT", "version": "v1" } ]
2014-05-21
[ [ "Marcq", "Philippe", "" ] ]
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1402.4002
H. Paul Keeler Dr
Holger Paul Keeler
Free surface flow due to a submerged source
Australian honours thesis (similar to a masters by coursework)
null
null
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this thesis we consider the free surface flow due to a submerged source in a channel of finite depth. This problem has been considered previously in the literature, with some disagreement about whether or not a train of waves exist on the free surface for Froude numbers less than unity. The physical assumptions behind the accepted model are clearly stated and governing equations and boundary conditions derived. Complex variable theory is then employed to obtain a singular nonlinear integral equation, which describes the flow field completely. The integral equation is evaluated numerically using a collocation method, and implemented with mathematical software {\em Matlab}. The numerical solutions suggest that indeed waves do exist on the free surface, but are exponentially small in the limit that the Froude number approaches zero. An asymptotic expression is also derived to solve the integral equation, valid for small Froude numbers. This expansion is calculated to second order, which improves on the leading order solution given previously in the literature. Such a scheme is unable to predict waves on the free surface, since they are exponentially small. It is discussed how exponential asymptotics could be used to derive a more accurate analytic solution that describes waves on the free surface.
[ { "created": "Mon, 17 Feb 2014 13:57:25 GMT", "version": "v1" } ]
2014-02-18
[ [ "Keeler", "Holger Paul", "" ] ]
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1402.4004
Ella Gale
Ella Gale, Ben de Lacy Costello and Andrew Adamatzky
Design of a Hybrid Robot Control System using Memristor-Model and Ant-Inspired Based Information Transfer Protocols
Conference
Workshop on Unconventional Approaches to Robotics, Automation and Control (UARACIN), at International Conference on Robotics and Automation (ICRA) 2013, Karlsruhe, Germany, Fr-Ws-09, pgs. 34-36
null
null
cs.RO cs.ET cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is not always possible for a robot to process all the information from its sensors in a timely manner and thus quick and yet valid approximations of the robot's situation are needed. Here we design hybrid control for a robot within this limit using algorithms inspired by ant worker placement behaviour and based on memristor-based non-linearity.
[ { "created": "Mon, 17 Feb 2014 14:00:01 GMT", "version": "v1" } ]
2014-02-18
[ [ "Gale", "Ella", "" ], [ "Costello", "Ben de Lacy", "" ], [ "Adamatzky", "Andrew", "" ] ]
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1402.4007
Ella Gale
Ella Gale, Ben de Lacy Costello and Andrew Adamatzky
Does the D.C. Response of Memristors Allow Robotic Short-Term Memory and a Possible Route to Artificial Time Perception?
3 page position paper
Workshop on Unconventional Approaches to Robotics, Automation and Control (UARACIN), at International Conference on Robotics and Automation (ICRA) 2013, Karlsruhe, Germany, Fr-Ws-09, pgs. 22-24
null
null
cs.RO cs.ET cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Time perception is essential for task switching, and in the mammalian brain appears alongside other processes. Memristors are electronic components used as synapses and as models for neurons. The d.c. response of memristors can be considered as a type of short-term memory. Interactions of the memristor d.c. response within networks of memristors leads to the emergence of oscillatory dynamics and intermittent spike trains, which are similar to neural dynamics. Based on this data, the structure of a memristor network control for a robot as it undergoes task switching is discussed and it is suggested that these emergent network dynamics could improve the performance of role switching and learning in an artificial intelligence and perhaps create artificial time perception.
[ { "created": "Mon, 17 Feb 2014 14:08:57 GMT", "version": "v1" } ]
2014-02-18
[ [ "Gale", "Ella", "" ], [ "Costello", "Ben de Lacy", "" ], [ "Adamatzky", "Andrew", "" ] ]
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1402.4009
Kashyap Vijay
Kashyap.V and Boominathan.P
Privacy Shielding against Mass Surveillance
8 pages,8 figures,Published with International Journal of Engineering Trends and Technology (IJETT)
null
10.14445/22315381/IJETT-V8P213
null
cs.CY cs.CR
http://creativecommons.org/licenses/by-nc-sa/3.0/
Privacy Shielding against Mass Surveillance provides a step by step tactical approach to protecting the privacy of all the users of the internet from mass surveillance programs by the governments and other state agencies. Protection of privacy is of prime importance and Privacy Shielding provides the right means against mass surveillance programs and from malicious users trying to gain access to your systems. Although protection is difficult when massive government agencies like the National Security Agency and The Government Communications Headquarters target internet users for surveillance, it is possible because the target is not you as an individual but the entire mass as a whole. With the right approach and a broad perspective of the term Privacy, it is possible for one to freely access and share information over the internet without being victims of surveillance.
[ { "created": "Mon, 17 Feb 2014 14:09:00 GMT", "version": "v1" } ]
2014-02-18
[ [ "V", "Kashyap.", "" ], [ "P", "Boominathan.", "" ] ]
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1402.4010
Lucas Benedi\v{c}i\v{c}
Lucas Benedi\v{c}i\v{c}, Felipe A. Cruz, Tsuyoshi Hamada and Peter Koro\v{s}ec
A GRASS GIS parallel module for radio-propagation predictions
13 pages, 12 figures and 2 tables. International Journal of Geographical Information Science, 2014
null
10.1080/13658816.2013.879151
null
cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Geographical information systems are ideal candidates for the application of parallel programming techniques, mainly because they usually handle large data sets. To help us deal with complex calculations over such data sets, we investigated the performance constraints of a classic master-worker parallel paradigm over a message-passing communication model. To this end, we present a new approach that employs an external database in order to improve the calculation/communication overlap, thus reducing the idle times for the worker processes. The presented approach is implemented as part of a parallel radio-coverage prediction tool for the GRASS environment. The prediction calculation employs digital elevation models and land-usage data in order to analyze the radio coverage of a geographical area. We provide an extended analysis of the experimental results, which are based on real data from an LTE network currently deployed in Slovenia. Based on the results of the experiments, which were performed on a computer cluster, the new approach exhibits better scalability than the traditional master-worker approach. We successfully tackled real-world data sets, while greatly reducing the processing time and saturating the hardware utilization.
[ { "created": "Mon, 17 Feb 2014 14:10:12 GMT", "version": "v1" } ]
2014-02-18
[ [ "Benedičič", "Lucas", "" ], [ "Cruz", "Felipe A.", "" ], [ "Hamada", "Tsuyoshi", "" ], [ "Korošec", "Peter", "" ] ]
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1402.4013
Ella Gale
Ella Gale, Ben de Lacy Costello, Victor Erokhin and Andrew Adamatzky
The Short-term Memory (D.C. Response) of the Memristor Demonstrates the Causes of the Memristor Frequency Effect
Conference paper, to appear in CASFEST 2014 June, Melbourne
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null
null
cs.ET cond-mat.mtrl-sci cs.AR physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A memristor is often identified by showing its distinctive pinched hysteresis curve and testing for the effect of frequency. The hysteresis size should relate to frequency and shrink to zero as the frequency approaches infinity. Although mathematically understood, the material causes for this are not well known. The d.c. response of the memristor is a decaying curve with its own timescale. We show via mathematical reasoning that this decaying curve when transformed to a.c. leads to the frequency effect by considering a descretized curve. We then demonstrate the validity of this approach with experimental data from two different types of memristors.
[ { "created": "Mon, 17 Feb 2014 14:23:34 GMT", "version": "v1" } ]
2014-02-18
[ [ "Gale", "Ella", "" ], [ "Costello", "Ben de Lacy", "" ], [ "Erokhin", "Victor", "" ], [ "Adamatzky", "Andrew", "" ] ]
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1402.4016
Richard Nisius
Richard Nisius
On the combination of correlated estimates of a physics observable
22 pages, 7 figures, Version accepted by EPJC
null
10.1140/epjc/s10052-014-3004-2
null
physics.data-an hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The combination of a number of correlated estimates of a given observable is frequently performed using the Best Linear Unbiased Estimate (BLUE) method. Most features of such a combination can already be seen by analysing the special case of a pair of estimates from two correlated estimators of the observable. Two important parameters of this combination are the weight of the less precise estimate and the ratio of uncertainties of the combined result and the more precise estimate. Derivatives of these quantities are derived with respect to the correlation and the ratio of uncertainties of the two estimates. The impact of using either absolute or relative uncertainties in the BLUE combination is investigated on a number of examples including Peelle's Pertinent Puzzle. Using an example, a critical assessment is performed of suggested methods to deal with the fact that both the correlation and the ratio of uncertainties of a pair of estimates are typically only known with some uncertainty. Finally, a proposal is made to decide on the usefulness of a combination and to perform it. The proposal is based on possible improvements with respect to the most precise estimate by including additional estimates. This procedure can be applied to the general case of several observables.
[ { "created": "Mon, 17 Feb 2014 14:35:12 GMT", "version": "v1" }, { "created": "Mon, 28 Jul 2014 11:04:14 GMT", "version": "v2" } ]
2015-06-18
[ [ "Nisius", "Richard", "" ] ]
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1402.4021
Juraj Szavits Nossan
Juraj Szavits-Nossan, Kym Eden, Ryan J. Morris, Cait E. MacPhee, Martin R. Evans and Rosalind J. Allen
Inherent variability in the kinetics of autocatalytic protein self-assembly
5pp, 3 fig. + Supp. Mat. (7pp, 4 fig.), accepted for publication in PRL
Phys. Rev. Lett. 113, 098101 (2014)
10.1103/PhysRevLett.113.098101
null
cond-mat.soft cond-mat.stat-mech physics.bio-ph q-bio.BM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In small volumes, the kinetics of filamentous protein self-assembly is expected to show significant variability, arising from intrinsic molecular noise. This is not accounted for in existing deterministic models. We introduce a simple stochastic model including nucleation and autocatalytic growth via elongation and fragmentation, which allows us to predict the effects of molecular noise on the kinetics of autocatalytic self-assembly. We derive an analytic expression for the lag-time distribution, which agrees well with experimental results for the fibrillation of bovine insulin. Our expression decomposes the lag time variability into contributions from primary nucleation and autocatalytic growth and reveals how each of these scales with the key kinetic parameters. Our analysis shows that significant lag-time variability can arise from both primary nucleation and from autocatalytic growth, and should provide a way to extract mechanistic information on early-stage aggregation from small-volume experiments.
[ { "created": "Mon, 17 Feb 2014 14:50:36 GMT", "version": "v1" }, { "created": "Wed, 7 May 2014 12:23:50 GMT", "version": "v2" }, { "created": "Mon, 11 Aug 2014 14:57:29 GMT", "version": "v3" } ]
2014-08-28
[ [ "Szavits-Nossan", "Juraj", "" ], [ "Eden", "Kym", "" ], [ "Morris", "Ryan J.", "" ], [ "MacPhee", "Cait E.", "" ], [ "Evans", "Martin R.", "" ], [ "Allen", "Rosalind J.", "" ] ]
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1402.4028
Szabolcs Levente Fancsali
Szabolcs L. Fancsali (MTA-ELTE Geometric and Algebraic Combinatorics Research Group) and P\'eter Sziklai (ELTE Institute of Mathematics Department of Computer Science and MTA-ELTE Geometric and Algebraic Combinatorics Research Group)
Lines in higgledy-piggledy position
17 pages
Electronic Journal of Combinatorics Volume 21, Issue 2 (2014) Paper #P2.56
null
null
math.CO cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We examine sets of lines in PG(d,F) meeting each hyperplane in a generator set of points. We prove that such a set has to contain at least 1.5d lines if the field F has more than 1.5d elements, and at least 2d-1 lines if the field F is algebraically closed. We show that suitable 2d-1 lines constitute such a set (if |F| > or = 2d-1), proving that the lower bound is tight over algebraically closed fields. At last, we will see that the strong (s,A) subspace designs constructed by Guruswami and Kopparty have better (smaller) parameter A than one would think at first sight.
[ { "created": "Mon, 17 Feb 2014 15:21:05 GMT", "version": "v1" } ]
2014-07-22
[ [ "Fancsali", "Szabolcs L.", "", "MTA-ELTE Geometric and Algebraic Combinatorics\n Research Group" ], [ "Sziklai", "Péter", "", "ELTE Institute of Mathematics Department\n of Computer Science and MTA-ELTE Geometric and Algebraic Combinatorics\n Research Group" ] ]
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1402.4029
Ella Gale
Deborah Gater, Attya Iqbal, Jeffrey Davey and Ella Gale
Connecting Spiking Neurons to a Spiking Memristor Network Changes the Memristor Dynamics
Conference paper, 4 pages
Proceedings of the International Conference on Electronics, Circuits and Systems (ICECS) 2013, Abu Dhabi, UAE, December 8th-11th, 534--537
null
null
cs.ET cs.NE physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Memristors have been suggested as neuromorphic computing elements. Spike-time dependent plasticity and the Hodgkin-Huxley model of the neuron have both been modelled effectively by memristor theory. The d.c. response of the memristor is a current spike. Based on these three facts we suggest that memristors are well-placed to interface directly with neurons. In this paper we show that connecting a spiking memristor network to spiking neuronal cells causes a change in the memristor network dynamics by: removing the memristor spikes, which we show is due to the effects of connection to aqueous medium; causing a change in current decay rate consistent with a change in memristor state; presenting more-linear $I-t$ dynamics; and increasing the memristor spiking rate, as a consequence of interaction with the spiking neurons. This demonstrates that neurons are capable of communicating directly with memristors, without the need for computer translation.
[ { "created": "Mon, 17 Feb 2014 15:23:18 GMT", "version": "v1" } ]
2014-02-18
[ [ "Gater", "Deborah", "" ], [ "Iqbal", "Attya", "" ], [ "Davey", "Jeffrey", "" ], [ "Gale", "Ella", "" ] ]
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1402.4030
Zu-Guo Yu
Zu-Guo Yu, Yee Leung, Yongqin David Chen, Qiang Zhang, Vo Anh and Yu Zhou
Multifractal analyses of daily rainfall time series in Pearl River basin of China
16 pages, 7 figures, 1 table, accepted by Physica A
Physica A 405 (2014) 193-202
10.1016/j.physa.2014.02.047
null
physics.ao-ph cond-mat.stat-mech physics.geo-ph
http://creativecommons.org/licenses/by/3.0/
The multifractal properties of daily rainfall time series at the stations in Pearl River basin of China over periods of up to 45 years are examined using the universal multifractal approach based on the multiplicative cascade model and the multifractal detrended fluctuation analysis (MF-DFA). The results from these two kinds of multifractal analyses show that the daily rainfall time series in this basin have multifractal behavior in two different time scale ranges. It is found that the empirical multifractal moment function $K(q)$ of the daily rainfall time series can be fitted very well by the universal mulitifractal model (UMM). The estimated values of the conservation parameter $H$ from UMM for these daily rainfall data are close to zero indicating that they correspond to conserved fields. After removing the seasonal trend in the rainfall data, the estimated values of the exponent $h(2)$ from MF-DFA indicate that the daily rainfall time series in Pearl River basin exhibit no long-term correlations. It is also found that $K(2)$ and elevation series are negatively correlated. It shows a relationship between topography and rainfall variability.
[ { "created": "Mon, 17 Feb 2014 15:23:52 GMT", "version": "v1" } ]
2015-06-18
[ [ "Yu", "Zu-Guo", "" ], [ "Leung", "Yee", "" ], [ "Chen", "Yongqin David", "" ], [ "Zhang", "Qiang", "" ], [ "Anh", "Vo", "" ], [ "Zhou", "Yu", "" ] ]
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1402.4031
Farhad Farokhi
Farhad Farokhi, Andre M. H. Teixeira, Cedric Langbort
Estimation with Strategic Sensors
Results are generalized, illustrative examples are added, and the literature review is improved
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null
null
cs.GT cs.SY math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a model of estimation in the presence of strategic, self-interested sensors. We employ a game-theoretic setup to model the interaction between the sensors and the receiver. The cost function of the receiver is equal to the estimation error variance while the cost function of the sensor contains an extra term which is determined by its private information. We start by the single sensor case in which the receiver has access to a noisy but honest side information in addition to the message transmitted by a strategic sensor. We study both static and dynamic estimation problems. For both these problems, we characterize a family of equilibria in which the sensor and the receiver employ simple strategies. Interestingly, for the dynamic estimation problem, we find an equilibrium for which the strategic sensor uses a memory-less policy. We generalize the static estimation setup to multiple sensors with synchronous communication structure (i.e., all the sensors transmit their messages simultaneously). We prove the maybe surprising fact that, for the constructed equilibrium in affine strategies, the estimation quality degrades as the number of sensors increases. However, if the sensors are herding (i.e., copying each other policies), the quality of the receiver's estimation improves as the number of sensors increases. Finally, we consider the asynchronous communication structure (i.e., the sensors transmit their messages sequentially).
[ { "created": "Mon, 17 Feb 2014 15:27:35 GMT", "version": "v1" }, { "created": "Fri, 17 Oct 2014 00:50:37 GMT", "version": "v2" }, { "created": "Thu, 25 Jun 2015 00:52:00 GMT", "version": "v3" } ]
2015-06-26
[ [ "Farokhi", "Farhad", "" ], [ "Teixeira", "Andre M. H.", "" ], [ "Langbort", "Cedric", "" ] ]
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1402.4032
J\"org Main
Jacob Fuchs, J\"org Main, Holger Cartarius, G\"unter Wunner
Harmonic inversion analysis of exceptional points in resonance spectra
17 pages, 3 figures, submitted to J. Phys. A
J. Phys. A: Math. Theor. 47, 125304 (2014)
10.1088/1751-8113/47/12/125304
null
nlin.CD physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The spectra of, e.g. open quantum systems are typically given as the superposition of resonances with a Lorentzian line shape, where each resonance is related to a simple pole in the complex energy domain. However, at exceptional points two or more resonances are degenerate and the resulting non-Lorentzian line shapes are related to higher order poles in the complex energy domain. In the Fourier-transform time domain an $n$-th order exceptional point is characterised by a non-exponentially decaying time signal given as the product of an exponential function and a polynomial of degree $n-1$. The complex positions and amplitudes of the non-degenerate resonances can be determined with high accuracy by application of the nonlinear harmonic inversion method to the real-valued resonance spectra. We extend the harmonic inversion method to include the analysis of exceptional points. The technique yields, in the energy domain, the amplitudes of the higher order poles contributing to the spectra, and, in the time domain, the coefficients of the polynomial characterising the non-exponential decay of the time signal. The extended harmonic inversion method is demonstrated on two examples, viz. the analysis of exceptional points in resonance spectra of the hydrogen atom in crossed magnetic and electric fields, and an exceptional point occurring in the dynamics of a single particle in a time-dependent harmonic trap.
[ { "created": "Mon, 17 Feb 2014 15:31:13 GMT", "version": "v1" } ]
2014-03-12
[ [ "Fuchs", "Jacob", "" ], [ "Main", "Jörg", "" ], [ "Cartarius", "Holger", "" ], [ "Wunner", "Günter", "" ] ]
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1402.4033
Erheng Zhong
Erheng Zhong, Evan Wei Xiang, Wei Fan, Nathan Nan Liu, Qiang Yang
Friendship Prediction in Composite Social Networks
10 pages
null
null
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Friendship prediction is an important task in social network analysis (SNA). It can help users identify friends and improve their level of activity. Most previous approaches predict users' friendship based on their historical records, such as their existing friendship, social interactions, etc. However, in reality, most users have limited friends in a single network, and the data can be very sparse. The sparsity problem causes existing methods to overfit the rare observations and suffer from serious performance degradation. This is particularly true when a new social network just starts to form. We observe that many of today's social networks are composite in nature, where people are often engaged in multiple networks. In addition, users' friendships are always correlated, for example, they are both friends on Facebook and Google+. Thus, by considering those overlapping users as the bridge, the friendship knowledge in other networks can help predict their friendships in the current network. This can be achieved by exploiting the knowledge in different networks in a collective manner. However, as each individual network has its own properties that can be incompatible and inconsistent with other networks, the naive merging of all networks into a single one may not work well. The proposed solution is to extract the common behaviors between different networks via a hierarchical Bayesian model. It captures the common knowledge across networks, while avoiding negative impacts due to network differences. Empirical studies demonstrate that the proposed approach improves the mean average precision of friendship prediction over state-of-the-art baselines on nine real-world social networking datasets significantly.
[ { "created": "Mon, 17 Feb 2014 15:36:38 GMT", "version": "v1" } ]
2014-02-18
[ [ "Zhong", "Erheng", "" ], [ "Xiang", "Evan Wei", "" ], [ "Fan", "Wei", "" ], [ "Liu", "Nathan Nan", "" ], [ "Yang", "Qiang", "" ] ]
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1402.4036
Ella Gale
Ella Gale, Ben de Lacy Costello and Andrew Adamatzky
Is Spiking Logic the Route to Memristor-Based Computers?
Conference paper. Work also reported in US patent: `Logic device and method of performing a logical operation', patent application no. 14/089,191 (November 25, 2013)
Proceedings of the International Conference on Electronics, Circuits and Systems (ICECS) 2013, Abu Dhabi, UAE, December 8th-11th, 297--300
null
null
cs.ET cond-mat.mtrl-sci cs.AR cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Memristors have been suggested as a novel route to neuromorphic computing based on the similarity between neurons (synapses and ion pumps) and memristors. The D.C. action of the memristor is a current spike, which we think will be fruitful for building memristor computers. In this paper, we introduce 4 different logical assignations to implement sequential logic in the memristor and introduce the physical rules, summation, `bounce-back', directionality and `diminishing returns', elucidated from our investigations. We then demonstrate how memristor sequential logic works by instantiating a NOT gate, an AND gate and a Full Adder with a single memristor. The Full Adder makes use of the memristor's memory to add three binary values together and outputs the value, the carry digit and even the order they were input in.
[ { "created": "Mon, 17 Feb 2014 15:40:49 GMT", "version": "v1" } ]
2014-02-18
[ [ "Gale", "Ella", "" ], [ "Costello", "Ben de Lacy", "" ], [ "Adamatzky", "Andrew", "" ] ]
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null
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1402.4037
Hang Zhou
Sampath Kannan, Claire Mathieu, Hang Zhou
Near-Linear Query Complexity for Graph Inference
null
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
How efficiently can we find an unknown graph using distance or shortest path queries between its vertices? Let $G = (V,E)$ be an unweighted, connected graph of bounded degree. The edge set $E$ is initially unknown, and the graph can be accessed using a \emph{distance oracle}, which receives a pair of vertices $(u,v)$ and returns the distance between $u$ and $v$. In the \emph{verification} problem, we are given a hypothetical graph $\hat G = (V,\hat E)$ and want to check whether $G$ is equal to $\hat G$. We analyze a natural greedy algorithm and prove that it uses $n^{1+o(1)}$ distance queries. In the more difficult \emph{reconstruction} problem, $\hat G$ is not given, and the goal is to find the graph $G$. If the graph can be accessed using a \emph{shortest path oracle}, which returns not just the distance but an actual shortest path between $u$ and $v$, we show that extending the idea of greedy gives a reconstruction algorithm that uses $n^{1+o(1)}$ shortest path queries. When the graph has bounded treewidth, we further bound the query complexity of the greedy algorithms for both problems by $\tilde O(n)$. When the graph is chordal, we provide a randomized algorithm for reconstruction using $\tilde O(n)$ distance queries.
[ { "created": "Mon, 17 Feb 2014 15:44:34 GMT", "version": "v1" }, { "created": "Wed, 18 Feb 2015 09:45:58 GMT", "version": "v2" } ]
2015-02-19
[ [ "Kannan", "Sampath", "" ], [ "Mathieu", "Claire", "" ], [ "Zhou", "Hang", "" ] ]
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1402.4043
James Riely
Radha Jagadeesan and James Riely
Between Linearizability and Quiescent Consistency: Quantitative Quiescent Consistency
Short version in ICALP 2014. http://icalp2014.itu.dk/
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null
null
cs.PL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Linearizability is the de facto correctness criterion for concurrent data structures. Unfortunately, linearizability imposes a performance penalty which scales linearly in the number of contending threads. Quiescent consistency is an alternative criterion which guarantees that a concurrent data structure behaves correctly when accessed sequentially. Yet quiescent consistency says very little about executions that have any contention. We define quantitative quiescent consistency (QQC), a relaxation of linearizability where the degree of relaxation is proportional to the degree of contention. When quiescent, no relaxation is allowed, and therefore QQC refines quiescent consistency, unlike other proposed relaxations of linearizability. We show that high performance counters and stacks designed to satisfy quiescent consistency continue to satisfy QQC. The precise assumptions under which QQC holds provides fresh insight on these structures. To demonstrate the robustness of QQC, we provide three natural characterizations and prove compositionality.
[ { "created": "Mon, 17 Feb 2014 15:58:49 GMT", "version": "v1" }, { "created": "Wed, 16 Apr 2014 20:53:25 GMT", "version": "v2" }, { "created": "Sat, 26 Apr 2014 17:09:09 GMT", "version": "v3" } ]
2014-04-29
[ [ "Jagadeesan", "Radha", "" ], [ "Riely", "James", "" ] ]
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1402.4046
Ella Gale
Ella Gale, Ben de Lacy Costello and Andrew Adamatzky
Boolean Logic Gates From A Single Memristor Via Low-Level Sequential Logic
Conference paper, published in Springer Lecture Notes in Computer Science http://link.springer.com/chapter/10.1007%2F978-3-642-39074-6_9
Lecture Notes in Computer Science Volume 7956 2013 Unconventional Computation and Natural Computation 12th International Conference, UCNC 2013, Milan, Italy, July 1-5, 2013. Proceedings, 78-89
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null
cs.ET cs.AR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
By using the memristor's memory to both store a bit and perform an operation with a second input bit, simple Boolean logic gates have been built with a single memristor. The operation makes use of the interaction of current spikes (occasionally called current transients) found in both memristors and other devices. The sequential time-based logic methodology allows two logical input bits to be used on a one-port by sending the bits separated in time. The resulting logic gate is faster than one relying on memristor's state switching, low power and requires only one memristor. We experimentally demonstrate working OR and XOR gates made with a single flexible Titanium dioxide sol-gel memristor.
[ { "created": "Mon, 17 Feb 2014 16:21:31 GMT", "version": "v1" } ]
2014-02-18
[ [ "Gale", "Ella", "" ], [ "Costello", "Ben de Lacy", "" ], [ "Adamatzky", "Andrew", "" ] ]
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1402.4050
Diodato Ferraioli
Vincenzo Auletta, Ioannis Caragiannis, Diodato Ferraioli, Clemente Galdi, and Giuseppe Persiano
Minority Becomes Majority in Social Networks
To appear in WINE 2015
null
null
null
cs.GT cs.DS cs.MA cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is often observed that agents tend to imitate the behavior of their neighbors in a social network. This imitating behavior might lead to the strategic decision of adopting a public behavior that differs from what the agent believes is the right one and this can subvert the behavior of the population as a whole. In this paper, we consider the case in which agents express preferences over two alternatives and model social pressure with the majority dynamics: at each step an agent is selected and its preference is replaced by the majority of the preferences of her neighbors. In case of a tie, the agent does not change her current preference. A profile of the agents' preferences is stable if the preference of each agent coincides with the preference of at least half of the neighbors (thus, the system is in equilibrium). We ask whether there are network topologies that are robust to social pressure. That is, we ask if there are graphs in which the majority of preferences in an initial profile always coincides with the majority of the preference in all stable profiles reachable from that profile. We completely characterize the graphs with this robustness property by showing that this is possible only if the graph has no edge or is a clique or very close to a clique. In other words, except for this handful of graphs, every graph admits at least one initial profile of preferences in which the majority dynamics can subvert the initial majority. We also show that deciding whether a graph admits a minority that becomes majority is NP-hard when the minority size is at most 1/4-th of the social network size.
[ { "created": "Mon, 17 Feb 2014 16:35:13 GMT", "version": "v1" }, { "created": "Fri, 25 Jul 2014 08:35:26 GMT", "version": "v2" }, { "created": "Wed, 23 Sep 2015 10:30:40 GMT", "version": "v3" }, { "created": "Thu, 1 Oct 2015 07:46:50 GMT", "version": "v4" } ]
2015-10-02
[ [ "Auletta", "Vincenzo", "" ], [ "Caragiannis", "Ioannis", "" ], [ "Ferraioli", "Diodato", "" ], [ "Galdi", "Clemente", "" ], [ "Persiano", "Giuseppe", "" ] ]
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1402.4053
Franz J. Kir\'aly
Franz J Kir\'aly and Martin Ehler
The Algebraic Approach to Phase Retrieval and Explicit Inversion at the Identifiability Threshold
null
null
null
null
math.FA cs.CV cs.IT math.AG math.IT stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study phase retrieval from magnitude measurements of an unknown signal as an algebraic estimation problem. Indeed, phase retrieval from rank-one and more general linear measurements can be treated in an algebraic way. It is verified that a certain number of generic rank-one or generic linear measurements are sufficient to enable signal reconstruction for generic signals, and slightly more generic measurements yield reconstructability for all signals. Our results solve a few open problems stated in the recent literature. Furthermore, we show how the algebraic estimation problem can be solved by a closed-form algebraic estimation technique, termed ideal regression, providing non-asymptotic success guarantees.
[ { "created": "Mon, 17 Feb 2014 16:49:38 GMT", "version": "v1" } ]
2014-02-18
[ [ "Király", "Franz J", "" ], [ "Ehler", "Martin", "" ] ]
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1402.4058
Ihor Lubashevsky
Ihor Lubashevsky and Bohdan Datsko
Fractional Dynamics and Multi-Slide Model of Human Memory
Submitted to 36th Annual Conference of the Cognitive Science Society, Quebec City, Canada, July 23-26 2014
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q-bio.NC nlin.AO physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a single chunk model of long-term memory that combines the basic features of the ACT-R theory and the multiple trace memory architecture. The pivot point of the developed theory is a mathematical description of the creation of new memory traces caused by learning a certain fragment of information pattern and affected by the fragments of this pattern already retained by the current moment of time. Using the available psychological and physiological data these constructions are justified. The final equation governing the learning and forgetting processes is constructed in the form of the differential equation with the Caputo type fractional time derivative. Several characteristic situations of the learning (continuous and discontinuous) and forgetting processes are studied numerically. In particular, it is demonstrated that, first, the "learning" and "forgetting" exponents of the corresponding power laws of the memory fractional dynamics should be regarded as independent system parameters. Second, as far as the spacing effects are concerned, the longer the discontinuous learning process, the longer the time interval within which a subject remembers the information without its considerable lost. Besides, the latter relationship is a linear proportionality.
[ { "created": "Thu, 13 Feb 2014 05:06:43 GMT", "version": "v1" } ]
2014-02-18
[ [ "Lubashevsky", "Ihor", "" ], [ "Datsko", "Bohdan", "" ] ]
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1402.4062
Alexandra Silva
Filippo Bonchi and Stefan Milius and Alexandra Silva and Fabio Zanasi
How to Kill Epsilons with a Dagger -- A Coalgebraic Take on Systems with Algebraic Label Structure
null
null
10.1016/j.tcs.2015.03.024
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose an abstract framework for modeling state-based systems with internal behavior as e.g. given by silent or $\epsilon$-transitions. Our approach employs monads with a parametrized fixpoint operator $\dagger$ to give a semantics to those systems and implement a sound procedure of abstraction of the internal transitions, whose labels are seen as the unit of a free monoid. More broadly, our approach extends the standard coalgebraic framework for state-based systems by taking into account the algebraic structure of the labels of their transitions. This allows to consider a wide range of other examples, including Mazurkiewicz traces for concurrent systems.
[ { "created": "Mon, 17 Feb 2014 17:09:51 GMT", "version": "v1" }, { "created": "Sat, 1 Mar 2014 08:59:48 GMT", "version": "v2" } ]
2016-12-01
[ [ "Bonchi", "Filippo", "" ], [ "Milius", "Stefan", "" ], [ "Silva", "Alexandra", "" ], [ "Zanasi", "Fabio", "" ] ]
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1402.4064
Konrad Kulakowski
Konrad Ku{\l}akowski
Notes on the existence of solutions in the pairwise comparisons method using the Heuristic Rating Estimation approach
8 pages
null
10.1007/s10472-015-9474-6
null
cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Pairwise comparisons are a well-known method for modelling of the subjective preferences of a decision maker. A popular implementation of the method is based on solving an eigenvalue problem for M - the matrix of pairwise comparisons. This does not take into account the actual values of preference. The Heuristic Rating Estimation (HRE) approach is a modification of this method in which allows modelling of the reference values. To determine the relative order of preferences is to solve a certain linear equation system defined by the matrix A and the constant term vector b (both derived from M). The article explores the properties of these equation systems. In particular, it is proven that for some small data inconsistency the A matrix is an M-matrix, hence the equation proposed by the HRE approach has a unique strictly positive solution.
[ { "created": "Mon, 17 Feb 2014 17:11:55 GMT", "version": "v1" }, { "created": "Thu, 20 Feb 2014 23:13:15 GMT", "version": "v2" }, { "created": "Fri, 4 Apr 2014 00:14:37 GMT", "version": "v3" } ]
2015-09-25
[ [ "Kułakowski", "Konrad", "" ] ]
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1402.4065
R. Ramanathan
R. Ramanathan
Are atomic clocks slowing down? Possible connection between the quantum and the cosmos: A feasible experimental test of objective realism
8 pages
null
null
null
physics.gen-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An alternative to the current accepted model of expanding universe is presented. The proposal is anchored in the objective realist, stochastic formulation of quantum mechanics wherein the Planck constant plays the role of a diffusion constant which need not be an universal constant for all epochs. This underlying noise is charecterised by a very high initial value of the Planck constant which gradually decreased over the epochs gone by, finally reaching its present value .It is this decrease in the strength of the Planck constant that causes a spectral red shift with the passage of time .The compatibility of this proposal with some cosmological data is shown.Feasible spectroscopic measurement of a specific spectral line frequency done over a period of a few years can decisively either validate or invalidate the proposal in a terrestrially bound experiment. This proposal predicts a slowing down of atomic clocks by nearly 2. 10^-18 s with respect to every preceding second. A positive experimental outcome will validate the objective realist basis of quantum physics as advocated by Einstein and many others.
[ { "created": "Sun, 2 Feb 2014 10:31:14 GMT", "version": "v1" } ]
2014-02-18
[ [ "Ramanathan", "R.", "" ] ]
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1402.4067
Santiago Aja-Fernandez
Santiago Aja-Fernandez, Gonzalo Vegas-Sanchez-Ferrero, Antonio Trsitan-Vega
Statistical Noise Analysis in SENSE Parallel MRI
null
null
null
TECH-LPI2012-01. V2.0
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A complete first and second order statistical characterization of noise in SENSE reconstructed data is proposed. SENSE acquisitions have usually been modeled as Rician distributed, since the data reconstruction takes place into the spatial domain, where Gaussian noise is assumed. However, this model just holds for the first order statistics and obviates other effects induced by coils correlations and the reconstruction interpolation. Those effects are properly taken into account in this study, in order to fully justify a final SENSE noise model. As a result, some interesting features of the reconstructed image arise: (1) There is a strong correlation between adjacent lines. (2) The resulting distribution is non-stationary and therefore the variance of noise will vary from point to point across the image. Closed equations for the calculation of the variance of noise and the correlation coefficient between lines are proposed. The proposed model is totally compatible with g-factor formulations.
[ { "created": "Mon, 17 Feb 2014 17:16:21 GMT", "version": "v1" } ]
2014-02-18
[ [ "Aja-Fernandez", "Santiago", "" ], [ "Vegas-Sanchez-Ferrero", "Gonzalo", "" ], [ "Trsitan-Vega", "Antonio", "" ] ]
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1402.4069
Yasel Garc\'es Su\'arez
Yasel Garc\'es, Esley Torres, Osvaldo Pereira and Roberto Rodr\'iguez
Application of the Ring Theory in the Segmentation of Digital Images
Very interesting new index to compute the similarity among images. arXiv admin note: substantial text overlap with arXiv:1306.2624
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cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Ring theory is one of the branches of the abstract algebra that has been broadly used in images. However, ring theory has not been very related with image segmentation. In this paper, we propose a new index of similarity among images using Zn rings and the entropy function. This new index was applied as a new stopping criterion to the Mean Shift Iterative Algorithm with the goal to reach a better segmentation. An analysis on the performance of the algorithm with this new stopping criterion is carried out. The obtained results proved that the new index is a suitable tool to compare images.
[ { "created": "Mon, 17 Feb 2014 17:16:35 GMT", "version": "v1" }, { "created": "Mon, 24 Nov 2014 20:09:39 GMT", "version": "v2" } ]
2014-11-25
[ [ "Garcés", "Yasel", "" ], [ "Torres", "Esley", "" ], [ "Pereira", "Osvaldo", "" ], [ "Rodríguez", "Roberto", "" ] ]
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1402.4073
Daniel Lemire
Owen Kaser and Daniel Lemire
Threshold and Symmetric Functions over Bitmaps
This paper uses small fonts and colours and is only intended for electronic viewing
null
null
TR-14-001
cs.DB cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Bitmap indexes are routinely used to speed up simple aggregate queries in databases. Set operations such as intersections, unions and complements can be represented as logical operations (AND, OR, NOT). However, less is known about the application of bitmap indexes to more advanced queries. We want to extend the applicability of bitmap indexes. As a starting point, we consider symmetric Boolean queries (e.g., threshold functions). For example, we might consider stores as sets of products, and ask for products that are on sale in 2 to 10 stores. Such symmetric Boolean queries generalize intersection, union, and T-occurrence queries. It may not be immediately obvious to an engineer how to use bitmap indexes for symmetric Boolean queries. Yet, maybe surprisingly, we find that the best of our bitmap-based algorithms are competitive with the state-of-the-art algorithms for important special cases (e.g., MergeOpt, MergeSkip, DivideSkip, ScanCount). Moreover, unlike the competing algorithms, the result of our computation is again a bitmap which can be further processed within a bitmap index. We review algorithmic design issues such as the aggregation of many compressed bitmaps. We conclude with a discussion on other advanced queries that bitmap indexes might be able to support efficiently.
[ { "created": "Mon, 17 Feb 2014 17:22:05 GMT", "version": "v1" }, { "created": "Tue, 15 Nov 2016 01:59:54 GMT", "version": "v2" } ]
2016-11-16
[ [ "Kaser", "Owen", "" ], [ "Lemire", "Daniel", "" ] ]
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1402.4077
Thierry Lahaye
Daniel Barredo, Sylvain Ravets, Henning Labuhn, Lucas B\'eguin, Aline Vernier, Florence Nogrette, Thierry Lahaye, Antoine Browaeys
Demonstration of a strong Rydberg blockade in three-atom systems with anisotropic interactions
5 pages, 4 figures, supplemental material (including 1 figure)
Phys. Rev. Lett. 112, 183002 (2014)
10.1103/PhysRevLett.112.183002
null
physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the Rydberg blockade in a system of three atoms arranged in different 2D geometries (linear and triangular configurations). In the strong blockade regime, we observe high-contrast, coherent collective oscillations of the single excitation probability, and an almost perfect van der Waals blockade. Our data is consistent with a total population in doubly and triply excited states below 2%. In the partial blockade regime, we directly observe the anisotropy of the van der Waals interactions between $|nD\rangle$ Rydberg states in the triangular configuration. A simple model, that only uses independently measured two-body van der Waals interactions, fully reproduces the dynamics of the system without any adjustable parameter. These results are extremely promising for scalable quantum information processing and quantum simulation with neutral atoms.
[ { "created": "Mon, 17 Feb 2014 17:38:29 GMT", "version": "v1" }, { "created": "Fri, 9 May 2014 12:03:21 GMT", "version": "v2" } ]
2015-06-18
[ [ "Barredo", "Daniel", "" ], [ "Ravets", "Sylvain", "" ], [ "Labuhn", "Henning", "" ], [ "Béguin", "Lucas", "" ], [ "Vernier", "Aline", "" ], [ "Nogrette", "Florence", "" ], [ "Lahaye", "Thierry", "" ], [ "Browaeys", "Antoine", "" ] ]
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1402.4084
Edward Moroshko
Edward Moroshko, Koby Crammer
Selective Sampling with Drift
null
null
null
null
cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recently there has been much work on selective sampling, an online active learning setting, in which algorithms work in rounds. On each round an algorithm receives an input and makes a prediction. Then, it can decide whether to query a label, and if so to update its model, otherwise the input is discarded. Most of this work is focused on the stationary case, where it is assumed that there is a fixed target model, and the performance of the algorithm is compared to a fixed model. However, in many real-world applications, such as spam prediction, the best target function may drift over time, or have shifts from time to time. We develop a novel selective sampling algorithm for the drifting setting, analyze it under no assumptions on the mechanism generating the sequence of instances, and derive new mistake bounds that depend on the amount of drift in the problem. Simulations on synthetic and real-world datasets demonstrate the superiority of our algorithms as a selective sampling algorithm in the drifting setting.
[ { "created": "Mon, 17 Feb 2014 17:53:57 GMT", "version": "v1" } ]
2014-02-18
[ [ "Moroshko", "Edward", "" ], [ "Crammer", "Koby", "" ] ]
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1402.4092
Moshe Schwartz
Nehemia Schwartz and Moshe Schwartz
On a periodicity measure and superoscillations
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physics.data-an cond-mat.other nlin.CD
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The phenomenon of superoscillation, where band limited signals can oscillate over some time period with a frequency higher than the band limit, is not only very interesting but it also seems to offer many practical applications. The first reason is that the superoscillation frequency can be exploited to perform tasks beyond the limits imposed by the lower bandwidth of the signal. The second reason is that it is generic and applies to any wave form, be it optical, electrical, sonic, or quantum mechanical. For practical applications, it is important to overcome two problems. The first problem is that an overwhelming proportion of the energy goes into the non superoscillating part of the signal. The second problem is the control of the shape of the superoscillating part of the signal. The first problem has been recently addressed by optimization of the super oscillation yield, the ratio of the energy in the superoscillations to the total energy of the signal. The second problem may arise when the superoscillation, is to mimic a high frequency purely perodic signal. This may be required, for example, when a superoscillating force is to drive a harmonic oscillator at a high resonance frequency. In this paper the degree of periodicity of a signal is defined and applied to some yield optimized superoscillating signals.
[ { "created": "Thu, 13 Feb 2014 11:16:21 GMT", "version": "v1" } ]
2014-02-18
[ [ "Schwartz", "Nehemia", "" ], [ "Schwartz", "Moshe", "" ] ]
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1402.4099
Harry Nussbaumer
Harry Nussbaumer
Einstein's aborted attempt at a dynamic steady-state universe
11 pages, 3 figures. To appear in the Gedenkband "In memoriam Hilmar W. Duerbeck".(Acta Historica Astronomiae). References and minor items updated
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physics.hist-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In June 1930 Einstein visited Cambridge where he stayed with Eddington who had just shown that Einstein's supposedly static universe of 1917 was not stable. This forced Einstein to rethink his cosmology. He spent January and February 1931 at Pasadena. There, he discussed cosmology intensely with Tolman, conscious that he had to replace his original model of 1917. However, at the end of February he still had not made up his mind about an alternative. The Albert Einstein Archives of Jerusalem (AEA) hold an undated draft, handwritten by Einstein, which I date to the beginning of January 1931. In this draft Einstein hopes to have found a solution to the cosmological problem: a stationary, dynamic universe in expansion. His model was stationary because particles leaving a given volume were replaced by particles created out of the vacuum, anticipating an idea of Bondi, Gold and Hoyle published in 1948. He saw the cosmological term as energy reservoir. However, he realised that his calculations contained a numerical error. When the error was corrected his steady-state-model collapsed.
[ { "created": "Fri, 14 Feb 2014 10:29:39 GMT", "version": "v1" }, { "created": "Mon, 24 Feb 2014 10:33:11 GMT", "version": "v2" } ]
2014-02-25
[ [ "Nussbaumer", "Harry", "" ] ]
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1402.4100
Lei Zhang Mr.
Lei Zhang, Hong-Chuan Yang, and Mazen O. Hasna
Generalized Area Spectral Efficiency: An Effective Performance Metric for Green Wireless Communications
11 pages, 8 figures, accepted by TCom
null
null
null
cs.NI cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Area spectral efficiency (ASE) was introduced as a metric to quantify the spectral utilization efficiency of cellular systems. Unlike other performance metrics, ASE takes into account the spatial property of cellular systems. In this paper, we generalize the concept of ASE to study arbitrary wireless transmissions. Specifically, we introduce the notion of affected area to characterize the spatial property of arbitrary wireless transmissions. Based on the definition of affected area, we define the performance metric, generalized area spectral efficiency (GASE), to quantify the spatial spectral utilization efficiency as well as the greenness of wireless transmissions. After illustrating its evaluation for point-to-point transmission, we analyze the GASE performance of several different transmission scenarios, including dual-hop relay transmission, three-node cooperative relay transmission and underlay cognitive radio transmission. We derive closed-form expressions for the GASE metric of each transmission scenario under Rayleigh fading environment whenever possible. Through mathematical analysis and numerical examples, we show that the GASE metric provides a new perspective on the design and optimization of wireless transmissions, especially on the transmitting power selection. We also show that introducing relay nodes can greatly improve the spatial utilization efficiency of wireless systems. We illustrate that the GASE metric can help optimize the deployment of underlay cognitive radio systems.
[ { "created": "Thu, 13 Feb 2014 22:10:35 GMT", "version": "v1" } ]
2014-02-18
[ [ "Zhang", "Lei", "" ], [ "Yang", "Hong-Chuan", "" ], [ "Hasna", "Mazen O.", "" ] ]
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1402.4101
Val\'erio Ramos Batista
Marcelo Zanchetta do Nascimento and Val\'erio Ramos Batista
First steps to Virtual Mammography: Simulating external compressions of the breast with the Surface Evolver
null
null
null
null
cs.CE physics.med-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we introduce a computational modelling that reproduces the breast compression processes used to obtain the mammogram. The main result is a programme in which one can track the first steps of virtual mammography. On the one hand, our modelling enables addition of structures that represent different tissues, muscles and glands in the breast. On the other hand, we shall validate and implement it by means of laboratory tests with phantoms. To the best of our knowledge, these two characteristics do confer originality to our research. This is because their interrelation seems not to be properly established elsewhere yet. We conclude that our model reproduces the same shapes and measurements really taken from the volunteer's breasts.
[ { "created": "Mon, 17 Feb 2014 19:56:22 GMT", "version": "v1" } ]
2014-02-18
[ [ "Nascimento", "Marcelo Zanchetta do", "" ], [ "Batista", "Valério Ramos", "" ] ]
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1402.4102
Tianqi Chen
Tianqi Chen, Emily B. Fox, Carlos Guestrin
Stochastic Gradient Hamiltonian Monte Carlo
ICML 2014 version
null
null
null
stat.ME cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Hamiltonian Monte Carlo (HMC) sampling methods provide a mechanism for defining distant proposals with high acceptance probabilities in a Metropolis-Hastings framework, enabling more efficient exploration of the state space than standard random-walk proposals. The popularity of such methods has grown significantly in recent years. However, a limitation of HMC methods is the required gradient computation for simulation of the Hamiltonian dynamical system-such computation is infeasible in problems involving a large sample size or streaming data. Instead, we must rely on a noisy gradient estimate computed from a subset of the data. In this paper, we explore the properties of such a stochastic gradient HMC approach. Surprisingly, the natural implementation of the stochastic approximation can be arbitrarily bad. To address this problem we introduce a variant that uses second-order Langevin dynamics with a friction term that counteracts the effects of the noisy gradient, maintaining the desired target distribution as the invariant distribution. Results on simulated data validate our theory. We also provide an application of our methods to a classification task using neural networks and to online Bayesian matrix factorization.
[ { "created": "Mon, 17 Feb 2014 19:57:59 GMT", "version": "v1" }, { "created": "Mon, 12 May 2014 06:38:21 GMT", "version": "v2" } ]
2014-05-13
[ [ "Chen", "Tianqi", "" ], [ "Fox", "Emily B.", "" ], [ "Guestrin", "Carlos", "" ] ]
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Stochastic Gradient Hamiltonian Monte Carlo
http://arxiv.org/abs/1402.4102v2
http://arxiv.org/pdf/1402.4102v2.pdf
https://github.com/JavierAntoran/Bayesian-Neural-Networks
false
false
https://paperswithcode.com/paper/stochastic-gradient-hamiltonian-monte-carlo
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1402.4111
Vincent Cohen-Addad
Vincent Cohen-Addad, Zhentao Li, Claire Mathieu, Ioannis Millis
Energy-efficient algorithms for non-preemptive speed-scaling
null
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We improve complexity bounds for energy-efficient speed scheduling problems for both the single processor and multi-processor cases. Energy conservation has become a major concern, so revisiting traditional scheduling problems to take into account the energy consumption has been part of the agenda of the scheduling community for the past few years. We consider the energy minimizing speed scaling problem introduced by Yao et al. where we wish to schedule a set of jobs, each with a release date, deadline and work volume, on a set of identical processors. The processors may change speed as a function of time and the energy they consume is the $\alpha$th power of its speed. The objective is then to find a feasible schedule which minimizes the total energy used. We show that in the setting with an arbitrary number of processors where all work volumes are equal, there is a $2(1+\varepsilon)(5(1+\varepsilon))^{\alpha -1}\tilde{B}_{\alpha}=O_{\alpha}(1)$ approximation algorithm, where $\tilde{B}_{\alpha}$ is the generalized Bell number. This is the first constant factor algorithm for this problem. This algorithm extends to general unequal processor-dependent work volumes, up to losing a factor of $(\frac{(1+r)r}{2})^{\alpha}$ in the approximation, where $r$ is the maximum ratio between two work volumes. We then show this latter problem is APX-hard, even in the special case when all release dates and deadlines are equal and $r$ is 4. In the single processor case, we introduce a new linear programming formulation of speed scaling and prove that its integrality gap is at most $12^{\alpha -1}$. As a corollary, we obtain a $(12(1+\varepsilon))^{\alpha -1}$ approximation algorithm where there is a single processor, improving on the previous best bound of $2^{\alpha-1}(1+\varepsilon)^{\alpha}\tilde{B}_{\alpha}$ when $\alpha \ge 25$.
[ { "created": "Mon, 17 Feb 2014 20:23:04 GMT", "version": "v1" }, { "created": "Tue, 18 Feb 2014 17:51:58 GMT", "version": "v2" } ]
2014-02-19
[ [ "Cohen-Addad", "Vincent", "" ], [ "Li", "Zhentao", "" ], [ "Mathieu", "Claire", "" ], [ "Millis", "Ioannis", "" ] ]
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1402.4116
M Zielinski J
E. Czerwi\'nski, M. Zieli\'nski, T. Bednarski, P. Bia{\l}as, {\L}. Kap{\l}on, A. Kochanowski, G. Korcyl, J. Kowal, P. Kowalski, T. Kozik, W. Krzemie\'n, E. Kubicz, M. Molenda, P. Moskal, Sz. Nied\'zwiecki, M. Pa{\l}ka, M. Pawlik, L. Raczy\'nski, Z. Rudy, P. Salabura, N. G. Sharma, M. Silarski, A. S{\l}omski, J. Smyrski, A. Strzelecki, A. Wieczorek, W.Wi\'slicki, N. Zo\'n
Database and data structure for the novel TOF-PET detector developed for J-PET project
6 p, 3 figs, based on talk given at Symposium on Positron Emission Tomography, Sept. 19-22, 2013, Jagiellonian University, Krak\'ow PL, submitted to Bio-Algorithms and Med-Systems
Bio-Algorithms and Med-Systems 10(2), 79-83 (2014)
10.1515/bams-2014-0003
null
physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The complexity of the hardware and the amount of data collected during the PET imaging process require application of modern methods of efficient data organization and processing. In this article we will discuss the data structures and the flow of collected data from the novel TOF-PET medical scanner which is being developed at the Jagiellonian University. The developed data format reflects: registration process of the gamma quanta emitted from positron-electron annihilation, Front-End Electronic (FEE) structure and required input information for the image reconstruction. In addition, the system database fulfills possible demands of the evolving J-PET project.
[ { "created": "Mon, 17 Feb 2014 20:47:18 GMT", "version": "v1" } ]
2014-08-19
[ [ "Czerwiński", "E.", "" ], [ "Zieliński", "M.", "" ], [ "Bednarski", "T.", "" ], [ "Białas", "P.", "" ], [ "Kapłon", "Ł.", "" ], [ "Kochanowski", "A.", "" ], [ "Korcyl", "G.", "" ], [ "Kowal", "J.", "" ], [ "Kowalski", "P.", "" ], [ "Kozik", "T.", "" ], [ "Krzemień", "W.", "" ], [ "Kubicz", "E.", "" ], [ "Molenda", "M.", "" ], [ "Moskal", "P.", "" ], [ "Niedźwiecki", "Sz.", "" ], [ "Pałka", "M.", "" ], [ "Pawlik", "M.", "" ], [ "Raczyński", "L.", "" ], [ "Rudy", "Z.", "" ], [ "Salabura", "P.", "" ], [ "Sharma", "N. G.", "" ], [ "Silarski", "M.", "" ], [ "Słomski", "A.", "" ], [ "Smyrski", "J.", "" ], [ "Strzelecki", "A.", "" ], [ "Wieczorek", "A.", "" ], [ "Wiślicki", "W.", "" ], [ "Zoń", "N.", "" ] ]
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1402.4123
C\'edric Beaume
Cedric Beaume, Edgar Knobloch, Greg P. Chini and Keith Julien
Exact coherent structures in a reduced model of parallel shear flow
null
null
null
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A reduced description of shear flows consistent with the Reynolds number scaling of lower-branch exact coherent states in plane Couette flow [J. Wang et al., Phys. Rev. Lett. 98, 204501 (2007)] is constructed. Exact time-independent nonlinear solutions of the reduced equations corresponding to both lower and upper branch states are found for Waleffe flow [F. Waleffe, Phys. Fluids 9, 883--900 (1997)]. The lower branch solution is characterized by fluctuations that vary slowly along the critical layer while the upper branch solutions display a bimodal structure and are more strongly focused on the critical layer. The reduced model provides a rational framework for investigations of subcritical spatiotemporal patterns in parallel shear flows.
[ { "created": "Sun, 16 Feb 2014 18:19:38 GMT", "version": "v1" } ]
2014-02-19
[ [ "Beaume", "Cedric", "" ], [ "Knobloch", "Edgar", "" ], [ "Chini", "Greg P.", "" ], [ "Julien", "Keith", "" ] ]
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1402.4152
Francesco Costanzo
Nitesh Nama and Po-Hsun Huang and Tony Jun Huang and Francesco Costanzo
Investigation of acoustic streaming patterns around oscillating sharp edges
15 pages, 11 figures, submitted for publication in " Lab on a Chip" on 12 February 2014, micro-acousto-fluidics, streaming flows, mixing
null
null
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Oscillating sharp edges have been employed to achieve rapid and homogeneous mixing in microchannels using acoustic streaming. Here we use a perturbation approach to study the flow around oscillating sharp edges in a microchannel. This work extends prior experimental studies to numerically characterize the effect of various parameters on the acoustically induced flow. Our numerical results match well with the experimental results. We investigated multiple device parameters such as the tip angle, oscillation amplitude, and channel dimensions. Our results indicate that, due to the inherent nonlinearity of acoustic streaming, the channel dimensions could significantly impact the flow patterns and device performance.
[ { "created": "Mon, 17 Feb 2014 21:28:14 GMT", "version": "v1" } ]
2014-02-19
[ [ "Nama", "Nitesh", "" ], [ "Huang", "Po-Hsun", "" ], [ "Huang", "Tony Jun", "" ], [ "Costanzo", "Francesco", "" ] ]
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1402.4155
Timothy Softley
Katrin Dulitz, Michael Motsch, Nicolas Vanhaecke and Timothy P. Softley
Getting a Grip on the Transverse Motion in a Zeeman Decelerator
accepted by J. Chem. Phys
null
10.1063/1.4866906
null
physics.atom-ph physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Zeeman deceleration is an experimental technique in which inhomogeneous, time-dependent magnetic fields generated inside an array of solenoid coils are used to manipulate the velocity of a supersonic beam. A 12-stage Zeeman decelerator has been built and characterized using hydrogen atoms as a test system. The instrument has several original features including the possibility to replace each deceleration coil individually. In this article, we give a detailed description of the experimental setup, and illustrate its performance. We demonstrate that the overall acceptance in a Zeeman decelerator can be significantly increased with only minor changes to the setup itself. This is achieved by applying a rather low, anti-parallel magnetic field in one of the solenoid coils that forms a temporally varying quadrupole field, and improves particle confinement in the transverse direction. The results are reproduced by three-dimensional numerical particle trajectory simulations thus allowing for a rigorous analysis of the experimental data. The findings suggest the use of a modified coil configuration to improve transverse focusing during the deceleration process.
[ { "created": "Mon, 17 Feb 2014 21:45:34 GMT", "version": "v1" } ]
2015-06-18
[ [ "Dulitz", "Katrin", "" ], [ "Motsch", "Michael", "" ], [ "Vanhaecke", "Nicolas", "" ], [ "Softley", "Timothy P.", "" ] ]
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1402.4157
Jan-Peter Calliess
Jan-Peter Calliess, Michael Osborne, Stephen Roberts
Conservative collision prediction and avoidance for stochastic trajectories in continuous time and space
This preprint is an extended version of a conference paper that is to appear in \textit{Proceedings of the 13th International Conference on Autonomous Agents and Multiagent Systems (AAMAS 2014)}
null
null
null
cs.AI cs.MA cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Existing work in multi-agent collision prediction and avoidance typically assumes discrete-time trajectories with Gaussian uncertainty or that are completely deterministic. We propose an approach that allows detection of collisions even between continuous, stochastic trajectories with the only restriction that means and variances can be computed. To this end, we employ probabilistic bounds to derive criterion functions whose negative sign provably is indicative of probable collisions. For criterion functions that are Lipschitz, an algorithm is provided to rapidly find negative values or prove their absence. We propose an iterative policy-search approach that avoids prior discretisations and yields collision-free trajectories with adjustably high certainty. We test our method with both fixed-priority and auction-based protocols for coordinating the iterative planning process. Results are provided in collision-avoidance simulations of feedback controlled plants.
[ { "created": "Mon, 17 Feb 2014 21:46:26 GMT", "version": "v1" }, { "created": "Mon, 12 May 2014 15:38:42 GMT", "version": "v2" } ]
2014-05-13
[ [ "Calliess", "Jan-Peter", "" ], [ "Osborne", "Michael", "" ], [ "Roberts", "Stephen", "" ] ]
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1402.4159
Xiaozhe Wang
Xiaozhe Wang, Hsiao-Dong Chiang
Application of Pseudo-Transient Continuation Method in Dynamic Stability Analysis
This paper has been accepted by IEEE PES general meeting, 2014
null
10.1109/PESGM.2014.6938891
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, pseudo-transient continuation method has been modified and implemented in power system long-term stability analysis. This method is a middle ground between integration and steady state calculation, thus is a good compromise between accuracy and efficiency. Pseudo-transient continuation method can be applied in the long-term stability model directly to accelerate simulation speed and can also be implemented in the QSS model to overcome numerical difficulties. Numerical examples show that pseudo-transient continuation method can provide correct approximations for the long-term stability model in terms of trajectories and stability assessment.
[ { "created": "Mon, 17 Feb 2014 21:55:30 GMT", "version": "v1" } ]
2016-11-18
[ [ "Wang", "Xiaozhe", "" ], [ "Chiang", "Hsiao-Dong", "" ] ]
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1402.4160
Rajeev Nongpiur
R. C. Nongpiur and D. J. Shpak
Maximizing the Signal-to-Alias Ratio in Non-Uniform Filter Banks for Acoustic Echo Cancellation
IEEE Transactions on Circuits and Systems I: Regular Paper, vol. 59, no. 10, Oct. 2012
null
null
null
cs.SD
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new method for designing non-uniform filter-banks for acoustic echo cancellation is proposed. In the method, the analysis prototype filter design is framed as a convex optimization problem that maximizes the signal-to-alias ratio (SAR) in the analysis banks. Since each sub-band has a different bandwidth, the contribution to the overall SAR from each analysis bank is taken into account during optimization. To increase the degrees of freedom during optimization, no constraints are imposed on the phase or group delay of the filters; at the same time, low delay is achieved by ensuring that the resulting filters are minimum phase. Experimental results show that the filter bank designed using the proposed method results in a sub-band adaptive filter with a much better echo return loss enhancement (ERLE) when compared with existing design methods.
[ { "created": "Fri, 14 Feb 2014 03:11:53 GMT", "version": "v1" } ]
2014-02-19
[ [ "Nongpiur", "R. C.", "" ], [ "Shpak", "D. J.", "" ] ]
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1402.4164
Eduardo R. B. Marques
Eduardo R. B. Marques
Fine-grained Patches for Java Software Upgrades
In Proc. HotSWUp'13, 6 pages, 4 figures, 1 table
Proc. 5th Workshop on Hot Topics in Software Upgrades, USENIX, 2013
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a novel methodology for deriving fine-grained patches of Java software. We consider an abstract-syntax tree (AST) representation of Java classes compiled to the Java Virtual Machine (JVM) format, and a difference analysis over the AST representation to derive patches. The AST representation defines an appropriate abstraction level for analyzing differences, yielding compact patches that correlate modularly to actual source code changes. The approach contrasts to other common, coarse-grained approaches, like plain binary differences, which may easily lead to disproportionately large patches. We present the main traits of the methodology, a prototype tool called aspa that implements it, and a case-study analysis on the use of aspa to derive patches for the Java 2 SE API. The case-study results illustrate that aspa patches have a significantly smaller size than patches derived by binary differencing tools.
[ { "created": "Mon, 17 Feb 2014 22:05:42 GMT", "version": "v1" } ]
2014-02-19
[ [ "Marques", "Eduardo R. B.", "" ] ]
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1402.4167
Yvan Sortais
J. Pellegrino, R. Bourgain, S. Jennewein, Y.R.P. Sortais, S.D. Jenkins and J. Ruostekoski and A. Browaeys
Observation of suppression of light scattering induced by dipole-dipole interactions in a cold atomic ensemble
5 pages, 5 figures
Phys. Rev. Lett. 113, 133602 (2014)
10.1103/PhysRevLett.113.133602
null
physics.atom-ph cond-mat.quant-gas quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the emergence of collective scattering in the presence of dipole-dipole interactions when we illuminate a cold cloud of rubidium atoms with a near-resonant and weak intensity laser. The size of the atomic sample is comparable to the wavelength of light. When we gradually increase the atom number from 1 to 450, we observe a broadening of the line, a small red shift and, consistently with these, a strong suppression of the scattered light with respect to the noninteracting atom case. Numerical simulations, which include the internal atomic level structure, agree with the data.
[ { "created": "Mon, 17 Feb 2014 22:13:37 GMT", "version": "v1" }, { "created": "Wed, 8 Oct 2014 12:05:01 GMT", "version": "v2" } ]
2014-10-09
[ [ "Pellegrino", "J.", "" ], [ "Bourgain", "R.", "" ], [ "Jennewein", "S.", "" ], [ "Sortais", "Y. R. P.", "" ], [ "Jenkins", "S. D.", "" ], [ "Ruostekoski", "J.", "" ], [ "Browaeys", "A.", "" ] ]
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1402.4171
Diego Garlaschelli
Rossana Mastrandrea, Tiziano Squartini, Giorgio Fagiolo, Diego Garlaschelli
Reconstructing the world trade multiplex: the role of intensive and extensive biases
null
Phys. Rev. E 90, 062804 (2014)
10.1103/PhysRevE.90.062804
null
q-fin.GN physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In economic and financial networks, the strength of each node has always an important economic meaning, such as the size of supply and demand, import and export, or financial exposure. Constructing null models of networks matching the observed strengths of all nodes is crucial in order to either detect interesting deviations of an empirical network from economically meaningful benchmarks or reconstruct the most likely structure of an economic network when the latter is unknown. However, several studies have proved that real economic networks and multiplexes are topologically very different from configurations inferred only from node strengths. Here we provide a detailed analysis of the World Trade Multiplex by comparing it to an enhanced null model that simultaneously reproduces the strength and the degree of each node. We study several temporal snapshots and almost one hundred layers (commodity classes) of the multiplex and find that the observed properties are systematically well reproduced by our model. Our formalism allows us to introduce the (static) concept of extensive and intensive bias, defined as a measurable tendency of the network to prefer either the formation of extra links or the reinforcement of link weights, with respect to a reference case where only strengths are enforced. Our findings complement the existing economic literature on (dynamic) intensive and extensive trade margins. More in general, they show that real-world multiplexes can be strongly shaped by layer-specific local constraints.
[ { "created": "Mon, 17 Feb 2014 22:46:12 GMT", "version": "v1" }, { "created": "Fri, 25 Apr 2014 20:52:02 GMT", "version": "v2" }, { "created": "Mon, 24 Nov 2014 10:05:02 GMT", "version": "v3" } ]
2014-12-09
[ [ "Mastrandrea", "Rossana", "" ], [ "Squartini", "Tiziano", "" ], [ "Fagiolo", "Giorgio", "" ], [ "Garlaschelli", "Diego", "" ] ]
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1402.4172
Wenyan Xu
Wenyan Xu
A propositional system induced by Japaridze's approach to IF logic
null
null
null
null
cs.LO math.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cirquent calculus is a new proof-theoretic and semantic approach introduced for the needs of computability logic by G.Japaridze, who also showed that, through cirquent calculus, one can capture, refine and generalize independence-friendly (IF) logic. Specifically, the approach allows us to account for independence from propositional connectives in the same spirit as the traditional IF logic accounts for independence from quantifiers. Japaridze's treatment of IF logic, however, was purely semantical, and no deductive system was proposed. The present paper constructs a formal system sound and complete w.r.t. the propositional fragment of Japaridze's cirquent-based semantics for IF logic. Such a system can thus be considered an axiomatization of purely propositional IF logic in its full generality.
[ { "created": "Mon, 17 Feb 2014 22:54:14 GMT", "version": "v1" }, { "created": "Fri, 23 May 2014 14:44:05 GMT", "version": "v2" } ]
2014-05-26
[ [ "Xu", "Wenyan", "" ] ]
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1402.4178
Thomas Kalinowski
Enrico Angelelli, Thomas Kalinowski, Reena Kapoor, Martin W.P. Savelsbergh
A reclaimer scheduling problem arising in coal stockyard management
26 pages
Journal of Scheduling 19(5), 563-582, 2016
10.1007/s10951-015-0436-y
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study a number of variants of an abstract scheduling problem inspired by the scheduling of reclaimers in the stockyard of a coal export terminal. We analyze the complexity of each of the variants, providing complexity proofs for some and polynomial algorithms for others. For one, especially interesting variant, we also develop a constant factor approximation algorithm.
[ { "created": "Mon, 17 Feb 2014 23:23:05 GMT", "version": "v1" }, { "created": "Thu, 1 Jan 2015 22:44:35 GMT", "version": "v2" } ]
2018-04-25
[ [ "Angelelli", "Enrico", "" ], [ "Kalinowski", "Thomas", "" ], [ "Kapoor", "Reena", "" ], [ "Savelsbergh", "Martin W. P.", "" ] ]
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1402.4179
Alejandro Tejedor
Alejandro Tejedor, Anthony Longjas, Ilya Zaliapin, Samuel Ambroj and Efi Foufoula-Georgiou
Network robustness assessed within a dual connectivity perspective
null
null
null
null
physics.soc-ph cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Network robustness against attacks has been widely studied in fields as diverse as the Internet, power grids and human societies. Typically, in these studies, robustness is assessed only in terms of the connectivity of the nodes unaffected by the attack. Here we put forward the idea that the connectivity of the affected nodes can play a crucial role in properly evaluating the overall network robustness and its future recovery from the attack. Specifically, we propose a dual perspective approach wherein at any instant in the network evolution under attack, two distinct networks are defined: (i) the Active Network (AN) composed of the unaffected nodes and (ii) the Idle Network (IN) composed of the affected nodes. The proposed robustness metric considers both the efficiency of destroying the AN and the efficiency of building-up the IN. We show, via analysis of both prototype networks and real world data, that trade-offs between the efficiency of Active and Idle network dynamics give rise to surprising crossovers and re-ranking of different attack strategies, pointing to significant implications for decision making.
[ { "created": "Mon, 17 Feb 2014 23:29:08 GMT", "version": "v1" }, { "created": "Fri, 14 Mar 2014 00:06:19 GMT", "version": "v2" } ]
2014-03-17
[ [ "Tejedor", "Alejandro", "" ], [ "Longjas", "Anthony", "" ], [ "Zaliapin", "Ilya", "" ], [ "Ambroj", "Samuel", "" ], [ "Foufoula-Georgiou", "Efi", "" ] ]
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1402.4182
Miltiadis Allamanis
Miltiadis Allamanis and Earl T. Barr and Christian Bird and Charles Sutton
Learning Natural Coding Conventions
null
null
10.1145/2635868.2635883
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Every programmer has a characteristic style, ranging from preferences about identifier naming to preferences about object relationships and design patterns. Coding conventions define a consistent syntactic style, fostering readability and hence maintainability. When collaborating, programmers strive to obey a project's coding conventions. However, one third of reviews of changes contain feedback about coding conventions, indicating that programmers do not always follow them and that project members care deeply about adherence. Unfortunately, programmers are often unaware of coding conventions because inferring them requires a global view, one that aggregates the many local decisions programmers make and identifies emergent consensus on style. We present NATURALIZE, a framework that learns the style of a codebase, and suggests revisions to improve stylistic consistency. NATURALIZE builds on recent work in applying statistical natural language processing to source code. We apply NATURALIZE to suggest natural identifier names and formatting conventions. We present four tools focused on ensuring natural code during development and release management, including code review. NATURALIZE achieves 94% accuracy in its top suggestions for identifier names and can even transfer knowledge about conventions across projects, leveraging a corpus of 10,968 open source projects. We used NATURALIZE to generate 18 patches for 5 open source projects: 14 were accepted.
[ { "created": "Mon, 17 Feb 2014 23:40:01 GMT", "version": "v1" }, { "created": "Fri, 4 Apr 2014 13:31:02 GMT", "version": "v2" }, { "created": "Mon, 7 Apr 2014 13:03:52 GMT", "version": "v3" } ]
2016-11-09
[ [ "Allamanis", "Miltiadis", "" ], [ "Barr", "Earl T.", "" ], [ "Bird", "Christian", "" ], [ "Sutton", "Charles", "" ] ]
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1402.4183
Zizhuo Wang
Dongdong Ge, Zizhuo Wang, Lai Wei, Jiawei Zhang
An Improved Algorithm for Fixed-Hub Single Allocation Problem
null
null
null
null
cs.DS cs.CC math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper discusses the fixed-hub single allocation problem (FHSAP). In this problem, a network consists of hub nodes and terminal nodes. Hubs are fixed and fully connected; each terminal node is connected to a single hub which routes all its traffic. The goal is to minimize the cost of routing the traffic in the network. In this paper, we propose a linear programming (LP)-based rounding algorithm. The algorithm is based on two ideas. First, we modify the LP relaxation formulation introduced in Ernst and Krishnamoorthy (1996, 1999) by incorporating a set of validity constraints. Then, after obtaining a fractional solution to the LP relaxation, we make use of a geometric rounding algorithm to obtain an integral solution. We show that by incorporating the validity constraints, the strengthened LP often provides much tighter upper bounds than the previous methods with a little more computational effort, and the solution obtained often has a much smaller gap with the optimal solution. We also formulate a robust version of the FHSAP and show that it can guard against data uncertainty with little cost.
[ { "created": "Mon, 17 Feb 2014 23:42:50 GMT", "version": "v1" } ]
2014-02-19
[ [ "Ge", "Dongdong", "" ], [ "Wang", "Zizhuo", "" ], [ "Wei", "Lai", "" ], [ "Zhang", "Jiawei", "" ] ]
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1402.4189
Eldad Avital
J. Punekar, E.J. Avital and R.E. Musafir
Computations of Nonlinear Propagation of Sound Emitted from High Speed Mixing Layers
null
Open Acoustics J. 3, 11-20
null
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Non-linear sound propagation is investigated computationally by simulating compressible time-developing mixing layers using the Large Eddy Simulation (LES) approach and solving the viscous Burgers Equation. The mixing layers are of convective Mach numbers of 0.4, 0.8 and 1.2. The LES results agree qualitatively with known flow behavior. Mach waves are observed in the near sound field of the supersonic mixing layer computed by the LES. These waves show steepening typical to non-linear propagation. Further calculations using the Burgers equation support this finding, where the initial wave slope has a role in kicking them. No visible non-linear propagation effects were found for the subsonic mixing layers. The effects of geometrical spreading and viscosity are also considered.
[ { "created": "Tue, 18 Feb 2014 00:10:28 GMT", "version": "v1" } ]
2014-02-19
[ [ "Punekar", "J.", "" ], [ "Avital", "E. J.", "" ], [ "Musafir", "R. E.", "" ] ]
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1402.4191
Mathieu Salanne
Dario Corradini, Dario Marrocchelli, Paul A. Madden, Mathieu Salanne
Effect of dispersion interactions on the properties of LiF in condensed phases
8 pages, 5 figures
J. Phys.: Condens. Matter, 26, 244103, 2014
10.1088/0953-8984/26/24/244103
null
cond-mat.mtrl-sci physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Classical molecular dynamics simulations are performed on LiF in the framework of the polarizable ion model. The overlap-repulsion and polarization terms of the interaction potential are derived on a purely non empirical, first-principles basis. For the dispersion, three cases are considered: a first one in which the dispersion parameters are set to zero and two others in which they are included, with different parameterizations. Various thermodynamic, structural and dynamic properties are calculated for the solid and liquid phases. The melting temperature is also obtained by direct coexistence simulations of the liquid and solid phases. Dispersion interactions appear to have an important effect on the density of both phases and on the melting point, although the liquid properties are not affected when simulations are performed in the NVT ensemble at the experimental density.
[ { "created": "Tue, 18 Feb 2014 00:14:30 GMT", "version": "v1" } ]
2015-01-07
[ [ "Corradini", "Dario", "" ], [ "Marrocchelli", "Dario", "" ], [ "Madden", "Paul A.", "" ], [ "Salanne", "Mathieu", "" ] ]
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1402.4194
Shaddin Dughmi
Shaddin Dughmi
On the Hardness of Signaling
null
null
null
null
cs.GT cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
There has been a recent surge of interest in the role of information in strategic interactions. Much of this work seeks to understand how the realized equilibrium of a game is influenced by uncertainty in the environment and the information available to players in the game. Lurking beneath this literature is a fundamental, yet largely unexplored, algorithmic question: how should a "market maker" who is privy to additional information, and equipped with a specified objective, inform the players in the game? This is an informational analogue of the mechanism design question, and views the information structure of a game as a mathematical object to be designed, rather than an exogenous variable. We initiate a complexity-theoretic examination of the design of optimal information structures in general Bayesian games, a task often referred to as signaling. We focus on one of the simplest instantiations of the signaling question: Bayesian zero-sum games, and a principal who must choose an information structure maximizing the equilibrium payoff of one of the players. In this setting, we show that optimal signaling is computationally intractable, and in some cases hard to approximate, assuming that it is hard to recover a planted clique from an Erdos-Renyi random graph. This is despite the fact that equilibria in these games are computable in polynomial time, and therefore suggests that the hardness of optimal signaling is a distinct phenomenon from the hardness of equilibrium computation. Necessitated by the non-local nature of information structures, en-route to our results we prove an "amplification lemma" for the planted clique problem which may be of independent interest.
[ { "created": "Tue, 18 Feb 2014 00:43:23 GMT", "version": "v1" }, { "created": "Thu, 3 Apr 2014 05:41:56 GMT", "version": "v2" }, { "created": "Wed, 16 Jul 2014 18:27:43 GMT", "version": "v3" }, { "created": "Sun, 20 Jul 2014 11:26:31 GMT", "version": "v4" } ]
2014-07-22
[ [ "Dughmi", "Shaddin", "" ] ]
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1402.4211
Tao Xiong
Yukun Bao, Tao Xiong, Zhongyi Hu, Mboni Kibelloh
Exploring gender differences on general and specific computer self-efficacy in mobile learning adoption
30 pages
Journal of Educational Computing Reasearch.2013, Vol. 49(1).111-132
null
null
cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Reasons for contradictory findings regarding the gender moderate effect on computer self-efficacy in the adoption of e-learning/mobile learning are limited. Recognizing the multilevel nature of the computer self-efficacy (CSE), this study attempts to explore gender differences in the adoption of mobile learning, by extending the Technology Acceptance Model (TAM) with general and specific CSE. Data collected from 137 university students were tested against the research model using the structural equation modeling approach. The results suggest that there are significant gender differences in perceptions of general CSE, perceived ease of use and behavioral intention to use but no significant differences in specific CSE, perceived usefulness. Additionally, the findings reveal that specific CSE is more salient than general CSE in influencing perceived ease of use while general CSE seems to be the salient factor on perceived usefulness for both female and male combined. Moreover, general CSE was salient to determine the behavioral intention to use indirectly for female despite lower perception of general CSE than male's, and specific CSE exhibited stronger indirect effect on behavioral intention to use than general CSE for female despite similar perception of specific CSE as males'. These findings provide important implications for mobile learning adoption and usage.
[ { "created": "Tue, 18 Feb 2014 02:41:59 GMT", "version": "v1" } ]
2014-02-19
[ [ "Bao", "Yukun", "" ], [ "Xiong", "Tao", "" ], [ "Hu", "Zhongyi", "" ], [ "Kibelloh", "Mboni", "" ] ]
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1402.4214
Timur Tscherbul
T. V. Tscherbul and P. Brumer
Quantum Yields from Stationary States: Cis-Trans Isomerization of Model Retinal
null
null
null
null
physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cis-trans isomerization in retinal, the first step in vision, is often computationally studied from a time dependent viewpoint. Motivation for such studies lies in coherent pulsed laser experiments that explore the isomerization dynamics. However, such biological processes take place naturally in the presence of incoherent light, which excites a non-evolving mixture of stationary states. Here the isomerization problem is considered from the latter viewpoint and applied to a standard two-state, two-mode linear vibronic coupling model of retinal that explicitly includes a conical intersection between the ground and first excited electronic states. The calculated quantum yield at 500 nm agrees well with both the previous time-dependent calculations of Hahn and Stock (0.63) and with experiment ($0.65\pm0.01$), as does its wavelength dependence. Significantly, the effects of environmental relaxation on the quantum yield in this well-established model are found to be negligible. The results make clear the connection of the photoisomerization quantum yield to properties of stationary eigenstates, providing alternate insights into conditions for yield optimization.
[ { "created": "Tue, 18 Feb 2014 02:57:58 GMT", "version": "v1" } ]
2014-02-19
[ [ "Tscherbul", "T. V.", "" ], [ "Brumer", "P.", "" ] ]
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1402.4223
Andreas Barth
Andreas Barth, Werner Marx, Lutz Bornmann, Ruediger Mutz
On the origins and the historical roots of the Higgs boson research from a bibliometric perspective
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null
null
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physics.hist-ph cs.DL hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Subject of our present paper is the analysis of the origins or historical roots of the Higgs boson research from a bibliometric perspective, using a segmented regression analysis in a reference publication year spectroscopy (RPYS). Our analysis is based on the references cited in the Higgs boson publications published since 1974. The objective of our analysis consists of identifying concrete individual publications in the Higgs boson research context to which the scientific community frequently had referred to. As a consequence, we are interested in seminal works which contributed to a high extent to the discovery of the Higgs boson. Our results show that researchers in the Higgs boson field preferably refer to more recently published papers - particular papers published since the beginning of the sixties. For example, our analysis reveals seven major contributions which appeared within the sixties: Englert and Brout (1964), Higgs (1964, 2 papers), and Guralnik et al. (1964) on the Higgs mechanism as well as Glashow (1961), Weinberg (1967), and Salam (1968) on the unification of weak and electromagnetic interaction. Even if the Nobel Prize award highlights the outstanding importance of the work of Peter Higgs and Francois Englert, bibliometrics offer the additional possibility of getting hints to other publications in this research field (especially to historical publications), which are of vital importance from the expert point of view.
[ { "created": "Mon, 17 Feb 2014 15:34:25 GMT", "version": "v1" }, { "created": "Tue, 29 Apr 2014 10:27:59 GMT", "version": "v2" } ]
2014-04-30
[ [ "Barth", "Andreas", "" ], [ "Marx", "Werner", "" ], [ "Bornmann", "Lutz", "" ], [ "Mutz", "Ruediger", "" ] ]
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1402.4224
Valery Pilipchuk
V.N. Pilipchuk
Asymptotic of 'rigid-body' motions for nonlinear dynamics: physical insight and methodologies
Presented at 12th DSTA Conference, December 2-5, 2013 {\L}\'od\'z, Poland
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null
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physics.class-ph nlin.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The purpose of the present work is to show that an adequate basis for understanding the essentially nonlinear phenomena must also be essentially nonlinear however still simple enough to play the role of a basis. It is shown that such types of 'elementary' nonlinear models can be revealed by tracking the hidden links between analytical tools of analyses and subgroups of the rigid-body motions or, in other terms, rigid Euclidean transformation. While the subgroup of rotations is linked with linear and weakly nonlinear vibrations, the translations with reflections can be viewed as a geometrical core of the strongly nonlinear dynamics associated with the so-called vibro-impact behaviors. It is shown that the corresponding analytical approach develops through non-smooth temporal substitutions generated by the impact models.
[ { "created": "Tue, 18 Feb 2014 04:48:54 GMT", "version": "v1" } ]
2014-02-19
[ [ "Pilipchuk", "V. N.", "" ] ]
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1402.4225
Changho Suh
Changho Suh
Information Theory of Matrix Completion
5 pages, submitted to the International Symposium on Information Theory 2014
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Matrix completion is a fundamental problem that comes up in a variety of applications like the Netflix problem, collaborative filtering, computer vision, and crowdsourcing. The goal of the problem is to recover a k-by-n unknown matrix from a subset of its noiseless (or noisy) entries. We define an information-theoretic notion of completion capacity C that quantifies the maximum number of entries that one observation of an entry can resolve. This number provides the minimum number m of entries required for reliable reconstruction: m=kn/C. Translating the problem into a distributed joint source-channel coding problem with encoder restriction, we characterize the completion capacity for a wide class of stochastic models of the unknown matrix and the observation process. Our achievability proof is inspired by that of the Slepian-Wolf theorem. For an arbitrary stochastic matrix, we derive an upper bound on the completion capacity.
[ { "created": "Tue, 18 Feb 2014 04:51:10 GMT", "version": "v1" } ]
2014-02-19
[ [ "Suh", "Changho", "" ] ]
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1402.4226
Krishna Kumar Dr
Hirdesh K. Pharasi and Krishna Kumar
Oscillatory instability and fluid patterns in low-Prandtl-number Rayleigh-B\'{e}nard convection with uniform rotation
32 pages, 14 figures, 1 table
Physics of Fluids 25, 104105 (2013)
10.1063/1.4825281
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the results of direct numerical simulations of flow patterns in a low-Prandtl-number ($Pr = 0.1$) fluid above the onset of oscillatory convection in a Rayleigh-B\'{e}nard system rotating uniformly about a vertical axis. Simulations were carried out in a periodic box with thermally conducting and stress-free top and bottom surfaces. We considered a rectangular box ($L_x \times L_y \times 1$) and a wide range of Taylor numbers ($750 \le Ta \le 5000$) for the purpose. The horizontal aspect ratio $\eta = L_y/L_x$ of the box was varied from $0.5$ to $10$. The primary instability appeared in the form of two-dimensional standing waves for shorter boxes ($0.5 \le \eta < 1$ and $1 < \eta < 2$). The flow patterns observed in boxes with $\eta = 1$ and $\eta = 2$ were different from those with $\eta < 1$ and $1 < \eta < 2$. We observed a competition between two sets of mutually perpendicular rolls at the primary instability in a square cell ($\eta = 1$) for $Ta < 2700$, but observed a set of parallel rolls in the form of standing waves for $Ta \geq 2700$. The three-dimensional convection was quasiperiodic or chaotic for $750 \le Ta < 2700$, and then bifurcated into a two-dimensional periodic flow for $Ta \ge 2700$. The convective structures consisted of the appearance and disappearance of straight rolls, rhombic patterns, and wavy rolls inclined at an angle $\phi = \frac{\pi}{2} - \arctan{(\eta^{-1})}$ with the straight rolls.
[ { "created": "Tue, 18 Feb 2014 05:30:12 GMT", "version": "v1" } ]
2014-02-19
[ [ "Pharasi", "Hirdesh K.", "" ], [ "Kumar", "Krishna", "" ] ]
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1402.4229
Alexander Pavlov
Ahmet Soysal, Suad sedki and Alexander Pavlov
Realization of white light cavity for ulra-short optical signal storage and Processing
arXiv admin note: substantial text overlap with arXiv:1308.3288
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null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have demonstrated that chirped Bragg gratings can compensate for a chromatic dispersion by reflecting different wavelengths at different location along the axis of the gratings. In this paper, we make use of such a dispersion-compensating property to create a white light cavity (WLC) effect that cancels the round trip phase shift due to propagation as the optical frequency is tuned. A pair of LCBGs is used to make the cavity. To fulfill WLC condition, the dispersion profile of the LCBGs is tailored by adjusting parameters such as chirping rate, modulation depth and the length of the grating region. Numerical simulation shows WLC bandwidth is ~10GHz.
[ { "created": "Tue, 18 Feb 2014 06:12:01 GMT", "version": "v1" } ]
2014-02-19
[ [ "Soysal", "Ahmet", "" ], [ "sedki", "Suad", "" ], [ "Pavlov", "Alexander", "" ] ]
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1402.4230
D\'avid Guszejnov
D\'avid Guszejnov, Attila Bencze, S\'andor Zoletnik, N\'ora Laz\'anyi
On the effect of intermittency of turbulence on the parabolic relation between skewness and kurtosis in magnetized plasmas
null
Physics of Plasmas, 20 112305 (2013)
10.1063/1.4835535
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper is aimed to contribute to the scientific discussions that have been triggered by the experimental observation of a quadratic relation between the kurtosis and skewness of turbulent fluctuations present in fusion plasmas and other nonlinear physical systems. In this paper we offer a general statistical model which attributes the observed $K = aS^2 + b$ relation to the varying intermittency of the experimental signals. The model is a two random variable model constructed to catch the essential intermittent feature of the real signal. One of the variables is the amplitude of the underlying intermittent event (e.g. turbulent structure) while the other is connected to the intermittency level of the system. This simple model can attribute physical meaning to the $a$ and $b$ coefficients, as they characterize the spatio-temporal statistics of intermittent events. By constructing a particle-conserving Gaussian model for the underlying coherent structures the experimentally measured $a$ and $b$ coefficients could be adequately reproduced.
[ { "created": "Tue, 18 Feb 2014 06:26:27 GMT", "version": "v1" } ]
2014-02-19
[ [ "Guszejnov", "Dávid", "" ], [ "Bencze", "Attila", "" ], [ "Zoletnik", "Sándor", "" ], [ "Lazányi", "Nóra", "" ] ]
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1402.4233
Assaf Shomer
Assaf Shomer
On the Phase Space of Block-Hiding Strategies in Bitcoin-like networks
28 pages, 7 figures
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We calculate the probability of success of block-hiding mining strategies in Bitcoin-like networks. These strategies involve building a secret branch of the block-tree and publishing it opportunistically, aiming to replace the top of the main branch and rip the reward associated with the secretly mined blocks. We identify two types of block-hiding strategies and chart the parameter space where those are more beneficial than the standard mining strategy described in Nakamoto's paper. Our analysis suggests a generalization of the notion of the relative hashing power as a measure for a miner's influence on the network. Block-hiding strategies are beneficial only when this measure of influence exceeds a certain threshold.
[ { "created": "Tue, 18 Feb 2014 06:54:23 GMT", "version": "v1" } ]
2014-02-19
[ [ "Shomer", "Assaf", "" ] ]
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1402.4237
Mathieu Salanne
A. E. Gheribi, D. Corradini, L. Dewan, P. Chartrand, C. Simon, P. A. Madden, M. Salanne
Prediction of the thermophysical properties of molten salt fast reactor fuel from first-principles
6 pages, 4 figures
Mol. Phys., 112, 1305-1312, 2014
10.1080/00268976.2014.897396
null
cond-mat.mtrl-sci physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Molten fluorides are known to show favorable thermophysical properties which make them good candidate coolants for nuclear fission reactors. Here we investigate the special case of mixtures of lithium fluoride and thorium fluoride, which act both as coolant and fuel in the molten salt fast reactor concept. By using ab initio parameterized polarizable force fields, we show that it is possible to calculate the whole set of properties (density, thermal expansion, heat capacity, viscosity and thermal conductivity) which are necessary for assessing the heat transfer performance of the melt over the whole range of compositions and temperatures. We then deduce from our calculations several figures of merit which are important in helping the optimization of the design of molten salt fast reactors.
[ { "created": "Tue, 18 Feb 2014 07:08:44 GMT", "version": "v1" } ]
2015-02-27
[ [ "Gheribi", "A. E.", "" ], [ "Corradini", "D.", "" ], [ "Dewan", "L.", "" ], [ "Chartrand", "P.", "" ], [ "Simon", "C.", "" ], [ "Madden", "P. A.", "" ], [ "Salanne", "M.", "" ] ]
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