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1402.1587
Paul Bonsma
Paul Bonsma
Independent Set Reconfiguration in Cographs
null
null
null
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cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the following independent set reconfiguration problem, called TAR-Reachability: given two independent sets $I$ and $J$ of a graph $G$, both of size at least $k$, is it possible to transform $I$ into $J$ by adding and removing vertices one-by-one, while maintaining an independent set of size at least $k$ throughout? This problem is known to be PSPACE-hard in general. For the case that $G$ is a cograph (i.e. $P_4$-free graph) on $n$ vertices, we show that it can be solved in time $O(n^2)$, and that the length of a shortest reconfiguration sequence from $I$ to $J$ is bounded by $4n-2k$, if such a sequence exists. More generally, we show that if $X$ is a graph class for which (i) TAR-Reachability can be solved efficiently, (ii) maximum independent sets can be computed efficiently, and which satisfies a certain additional property, then the problem can be solved efficiently for any graph that can be obtained from a collection of graphs in $X$ using disjoint union and complete join operations. Chordal graphs are given as an example of such a class $X$.
[ { "created": "Fri, 7 Feb 2014 10:12:05 GMT", "version": "v1" } ]
2014-02-10
[ [ "Bonsma", "Paul", "" ] ]
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1402.1590
Laszlo Deak
L. De\'ak, L. Botty\'an, D.L. Nagy and H. Spiering
The Coherent Forward Scattering Amplitude in Transmission and Grazing Incidence M\"ossbauer Spectroscopy
7 pages
Phys Rev B 53 (1996) 6158-6164
10.1103/PhysRevB.53.6158
null
cond-mat.other physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The theory of both transmission and grazing incidence M\"ossbauer spectroscopy is re-analyzed. Starting with the nuclear susceptibility tensor a common concise first order perturbation formulation is given by introducing the forward scattering amplitude into an anisotropic optical scheme. Formulae of Blume and Kistner as well as those of Andreeva are re-derived for the forward scattering and grazing incidence geometries, respectively. Limitations of several previously intuitively introduced approximations are pointed out. The grazing incidence integral propagation matrices are written in a form built up from 2x2 matrix exponentials which is particularly suitable for numerical calculations and practical fitting of both energy domain (conventional source experiment) and time domain (synchrotron radiation experiment) M\"ossbauer spectra.
[ { "created": "Fri, 7 Feb 2014 10:18:03 GMT", "version": "v1" } ]
2014-08-20
[ [ "Deák", "L.", "" ], [ "Bottyán", "L.", "" ], [ "Nagy", "D. L.", "" ], [ "Spiering", "H.", "" ] ]
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1402.1592
Euro Spallucci
Claudio Verzegnassi, Euro Spallucci
Goethe's Faust and the Minimal Action Principle: a possible Universal message
6 pages, no figures; short note to non-proficient in physics
null
null
null
physics.pop-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This short note is devoted to non-proficient in physics. Its purpose is that of proposing a possible universal connection between the definition of Action given by Goethe in his ``Faust'' tragic play and the Hamilton's Principle of the Minimal Action. This Principle is one of the most general ways of formulating the dynamics of a physical system both in classical and in quantum physics. The recent discovery of the long time searched Higgs particle may be seen as the most spectacular successful confirmation of the Standard Model formalism based on the Minimal Action Principle. Supported by this experimental confirmation, we propose a possible general meaning of the Principle, inspired by the Goethe's ``Faust'' tragic play.
[ { "created": "Fri, 7 Feb 2014 10:22:53 GMT", "version": "v1" } ]
2014-02-10
[ [ "Verzegnassi", "Claudio", "" ], [ "Spallucci", "Euro", "" ] ]
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1402.1602
Hongqiang Song
Hongqiang Song, Jie Zhang, Xin Cheng, Yao Chen, Rui Liu, Yuming Wang, and Bo Li
Temperature evolution of magnetic flux rope in a failed solar eruption
Accepted by the Astrophysical Journal (14 pages, 4 figures)
null
10.1088/0004-637X/784/1/48
null
physics.space-ph astro-ph.SR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this presentation, we report for the first time the detailed temperature evolution process of the magnetic flux rope in a failed solar eruption. Occurred on January 05, 2013, the flux rope was impulsively accelerated to a speed of ~ 400 km/s in the first minute, then decelerated and came to a complete stop in two minutes. The failed eruption resulted in a large-size high-lying (~ 100 Mm above the surface) high-temperature "fire ball" sitting in the corona for more than two hours. The time evolution of the thermal structure of the flux rope was revealed through the differential emission measure analysis technique, which produced temperature maps using observations of the Atmospheric Imaging Assembly on board Solar Dynamic Observatory. The average temperature of the flux rope steadily increased from ~ 5 MK to ~ 10 MK during the first nine minutes of the evolution, which was much longer than the rise time (about three minutes) of the associated soft X-ray flare. We suggest that the flux rope be heated by the energy release of the continuing magnetic reconnection, different from the heating of the low-lying flare loops, which is mainly produced by the chromospheric plasma evaporation. The loop arcade overlying the flux rope was pushed up by ~ 10 Mm during the attempted eruption. The pattern of the velocity variation of the loop arcade strongly suggests that the failure of the eruption be caused by the strapping effect of the overlying loop arcade.
[ { "created": "Fri, 7 Feb 2014 11:13:23 GMT", "version": "v1" } ]
2015-06-18
[ [ "Song", "Hongqiang", "" ], [ "Zhang", "Jie", "" ], [ "Cheng", "Xin", "" ], [ "Chen", "Yao", "" ], [ "Liu", "Rui", "" ], [ "Wang", "Yuming", "" ], [ "Li", "Bo", "" ] ]
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1402.1603
Yuri Lvov
Miguel Onorato, Lara Vozella, Davide Proment, Yuri V. Lvov
A route to thermalization in the $\alpha$-Fermi-Pasta-Ulam system
5 pages
Proceeding of National Academy of Science, 14, 4208 (2015)
10.1073/pnas.1404397112
null
nlin.CD cond-mat.stat-mech math-ph math.MP nlin.SI physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the original $\alpha$-Fermi-Pasta-Ulam (FPU) system with $N=16,32$ and $64$ masses connected by a nonlinear quadratic spring. Our approach is based on resonant wave-wave interaction theory, i.e. we assume that, in the weakly nonlinear regime (the one in which Fermi was originally interested), the large time dynamics is ruled by exact resonances. After a detailed analysis of the $\alpha$-FPU equation of motion, we find that the first non trivial resonances correspond to six-wave interactions. Those are precisely the interactions responsible for the thermalization of the energy in the spectrum. We predict that for small amplitude random waves the time scale of such interactions is extremely large and it is of the order of $1/\epsilon^8$, where $\epsilon$ is the small parameter in the system. The wave-wave interaction theory is not based on any threshold: equipartition is predicted for arbitrary small nonlinearity. Our results are supported by extensive numerical simulations. A key role in our finding is played by the {\it Umklapp} (flip over) resonant interactions, typical of discrete systems. The thermodynamic limit is also briefly discussed.
[ { "created": "Fri, 7 Feb 2014 11:15:00 GMT", "version": "v1" }, { "created": "Mon, 23 Feb 2015 18:47:55 GMT", "version": "v2" } ]
2020-06-05
[ [ "Onorato", "Miguel", "" ], [ "Vozella", "Lara", "" ], [ "Proment", "Davide", "" ], [ "Lvov", "Yuri V.", "" ] ]
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1402.1605
Sander Wahls
Sander Wahls and H. Vincent Poor
Fast Numerical Nonlinear Fourier Transforms
Minor changes
IEEE Transactions on Information Theory, vol. 61, no. 12, pp. 6957-6974, Dec. 2015
10.1109/TIT.2015.2485944
null
cs.IT math.IT math.NA nlin.SI physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The nonlinear Fourier transform, which is also known as the forward scattering transform, decomposes a periodic signal into nonlinearly interacting waves. In contrast to the common Fourier transform, these waves no longer have to be sinusoidal. Physically relevant waveforms are often available for the analysis instead. The details of the transform depend on the waveforms underlying the analysis, which in turn are specified through the implicit assumption that the signal is governed by a certain evolution equation. For example, water waves generated by the Korteweg-de Vries equation can be expressed in terms of cnoidal waves. Light waves in optical fiber governed by the nonlinear Schr\"odinger equation (NSE) are another example. Nonlinear analogs of classic problems such as spectral analysis and filtering arise in many applications, with information transmission in optical fiber, as proposed by Yousefi and Kschischang, being a very recent one. The nonlinear Fourier transform is eminently suited to address them -- at least from a theoretical point of view. Although numerical algorithms are available for computing the transform, a "fast" nonlinear Fourier transform that is similarly effective as the fast Fourier transform is for computing the common Fourier transform has not been available so far. The goal of this paper is to address this problem. Two fast numerical methods for computing the nonlinear Fourier transform with respect to the NSE are presented. The first method achieves a runtime of $O(D^2)$ floating point operations, where $D$ is the number of sample points. The second method applies only to the case where the NSE is defocusing, but it achieves an $O(D\log^2D)$ runtime. Extensions of the results to other evolution equations are discussed as well.
[ { "created": "Fri, 7 Feb 2014 11:24:49 GMT", "version": "v1" }, { "created": "Wed, 1 Oct 2014 09:12:08 GMT", "version": "v2" }, { "created": "Thu, 10 Sep 2015 10:56:08 GMT", "version": "v3" } ]
2015-11-24
[ [ "Wahls", "Sander", "" ], [ "Poor", "H. Vincent", "" ] ]
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1402.1607
Kangqi Liu
Kangqi Liu, Meixia Tao, Zhengzheng Xiang and Xin Long
Generalized Signal Alignment For MIMO Two-Way X Relay Channels
6 pages, 6 figures, to appear in IEEE ICC 2014
null
10.1109/ICC.2014.6884019
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the degrees of freedom (DoF) of MIMO two-way X relay channels. Previous work studied the case $N < 2M$, where $N$ and $M$ denote the number of antennas at the relay and each source, respectively, and showed that the maximum DoF of $2N$ is achievable when $N \leq \lfloor\frac{8M}{5}\rfloor$ by applying signal alignment (SA) for network coding and interference cancelation. This work considers the case $N>2M$ where the performance is limited by the number of antennas at each source node and conventional SA is not feasible. We propose a \textit{generalized signal alignment} (GSA) based transmission scheme. The key is to let the signals to be exchanged between every source node align in a transformed subspace, rather than the direct subspace, at the relay so as to form network-coded signals. This is realized by jointly designing the precoding matrices at all source nodes and the processing matrix at the relay. Moreover, the aligned subspaces are orthogonal to each other. By applying the GSA, we show that the DoF upper bound $4M$ is achievable when $M \leq \lfloor\frac{2N}{5}\rfloor$ ($M$ is even) or $M \leq \lfloor\frac{2N-1}{5}\rfloor$ ($M$ is odd). Numerical results also demonstrate that our proposed transmission scheme is feasible and effective.
[ { "created": "Fri, 7 Feb 2014 11:32:22 GMT", "version": "v1" } ]
2018-02-21
[ [ "Liu", "Kangqi", "" ], [ "Tao", "Meixia", "" ], [ "Xiang", "Zhengzheng", "" ], [ "Long", "Xin", "" ] ]
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1402.1614
Mehdi Samadieh
Mehdi samadieh and Mohammad Gholami
New LDPC Codes Using Permutation Matrices with Higher Girth than QC-LDPC Codes Constructed by Fossorier
This paper has been withdrawn by the authors. Some conclusions in the submitted paper are wrong and the authors decided to withdraw the paper
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null
null
cs.IT cs.DM math.CO math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the literatures, it is well-known that Fossorier code has the girth among LDPC codes. In this paper, we introduce a new class of low-density parity-check (LDPC) codes, with higher girth than other previous constructed codes. Especially we proposed a new method to construct LDPC codes using non fixed shift permutation matrices and full based matrices with higher girth than codes constructed by Fossorier.
[ { "created": "Fri, 7 Feb 2014 12:20:31 GMT", "version": "v1" }, { "created": "Fri, 21 Feb 2014 05:58:16 GMT", "version": "v2" }, { "created": "Wed, 26 Feb 2014 16:52:03 GMT", "version": "v3" } ]
2016-11-25
[ [ "samadieh", "Mehdi", "" ], [ "Gholami", "Mohammad", "" ] ]
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1402.1616
Jordi Pereira
Mariona Vil\`a, Jordi Pereira
A note on 'Exact and approximate methods for a one-dimensional minimax bin-packing problem' [Annals of Operations Research (2013) 206:611-626]
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cs.DS math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In a recent paper, Brusco, K\"ohn and Steinley [Ann. Oper. Res. 206:611-626 (2013)] conjecture that the 2 bins special case of the one-dimensional minimax bin-packing problem with bin size constraints might be solvable in polynomial time. In this note, we show that this problem is NP-hard for the special case and that it is strongly NP-hard for the general problem. We also propose a pseudo-polynomial algorithm for the special case and a constructive heuristic for the general problem.
[ { "created": "Fri, 7 Feb 2014 12:23:47 GMT", "version": "v1" } ]
2014-02-10
[ [ "Vilà", "Mariona", "" ], [ "Pereira", "Jordi", "" ] ]
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1402.1617
Michal Yemini
Michal Yemini, Anelia Somekh-Baruch and Amir Leshem
Asynchronous Transmission over Single-User State-Dependent Channels
The paper "On channels with asynchronous side information" was split into two separate papers: the enclosed paper which considers only point-to-point channels and an additional paper named "On the multiple access channel with asynchronous cognition" which discusses the multiuser setups
null
10.1109/TIT.2015.2476477
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Several channels with asynchronous side information are introduced. We first consider single-user state-dependent channels with asynchronous side information at the transmitter. It is assumed that the state information sequence is a possibly delayed version of the state sequence, and that the encoder and the decoder are aware of the fact that the state information might be delayed. It is additionally assumed that an upper bound on the delay is known to both encoder and decoder, but other than that, they are ignorant of the actual delay. We consider both the causal and the noncausal cases and present achievable rates for these channels, and the corresponding coding schemes. We find the capacity of the asynchronous Gel'fand-Pinsker channel with feedback. Finally, we consider a memoryless state dependent channel with asynchronous side information at both the transmitter and receiver, and establish a single-letter expression for its capacity.
[ { "created": "Fri, 7 Feb 2014 12:28:17 GMT", "version": "v1" }, { "created": "Sun, 29 Mar 2015 09:44:44 GMT", "version": "v2" } ]
2016-01-19
[ [ "Yemini", "Michal", "" ], [ "Somekh-Baruch", "Anelia", "" ], [ "Leshem", "Amir", "" ] ]
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1402.1624
Dietmar Janetzko
Dietmar Janetzko
Using Twitter to Model the EUR/USD Exchange Rate
35 pages, 6 figures
null
null
null
q-fin.ST cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Fast, global, and sensitively reacting to political, economic and social events of any kind, these are attributes that social media like Twitter share with foreign exchange markets. The leading assumption of this paper is that information which can be distilled from public debates on Twitter has predictive content for exchange rate movements. This assumption prompted a Twitter-based exchange rate model that harnesses regARIMA analyses for short-term out-of-sample ex post forecasts of the daily closing prices of EUR/USD spot exchange rates. The analyses used Tweet counts collected from January 1, 2012 - September 27, 2013. To identify concepts mentioned on Twitter with a predictive potential the analysis followed a 2-step selection. Firstly, a heuristic qualitative analysis assembled a long list of 594 concepts, e.g., Merkel, Greece, Cyprus, crisis, chaos, growth, unemployment expected to covary with the ups and downs of the EUR/USD exchange rate. Secondly, cross-validation using window averaging with a fixed-sized rolling origin was deployed to select concepts and corresponding univariate time series that had error scores below chance level as defined by the random walk model. With regard to a short list of 17 concepts (covariates), in particular SP (Standard & Poor's) and risk, the out-of-sample predictive accuracy of the Twitter-based regARIMA model was found to be repeatedly better than that obtained from both the random walk model and a random noise covariate in 1-step ahead forecasts of the EUR/USD exchange rate. This advantage was evident on the level of forecast error metrics (MSFE, MAE) when a majority vote over different estimation windows was conducted. The results challenge the semi-strong form of the efficient market hypothesis (Fama, 1970, 1991) which when applied to the FX market maintains that all publicly available information is already integrated into exchange rates.
[ { "created": "Fri, 7 Feb 2014 12:55:53 GMT", "version": "v1" } ]
2014-02-10
[ [ "Janetzko", "Dietmar", "" ] ]
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1402.1635
Wasantha Samarathunga
Wasantha Samarathunga, Masatoshi Seki, Hidenobu Saito, Ken Ichiryu, Yasuhiro Ohyama
Product Evaluation In Elliptical Helical Pipe Bending
null
International Journal of Computer Trends and Technology, volume 4 Issue 10 Oct 2013
null
null
cs.CE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This research proposes a computation approach to address the evaluation of end product machining accuracy in elliptical surfaced helical pipe bending using 6dof parallel manipulator as a pipe bender. The target end product is wearable metal muscle supporters used in build-to-order welfare product manufacturing. This paper proposes a product testing model that mainly corrects the surface direction estimation errors of existing least squares ellipse fittings, followed by arc length and central angle evaluations. This post-machining modelling requires combination of reverse rotations and translations to a specific location before accuracy evaluation takes place, i.e. the reverse comparing to pre-machining product modelling. This specific location not only allows us to compute surface direction but also the amount of excessive surface twisting as a rotation angle about a specified axis, i.e. quantification of surface torsion. At first we experimented three ellipse fitting methods such as, two least-squares fitting methods with Bookstein constraint and Trace constraint, and one non- linear least squares method using Gauss-Newton algorithm. From fitting results, we found that using Trace constraint is more reliable and designed a correction filter for surface torsion observation. Finally we apply 2D total least squares line fitting method with a rectification filter for surface direction detection.
[ { "created": "Fri, 7 Feb 2014 13:38:20 GMT", "version": "v1" } ]
2014-02-10
[ [ "Samarathunga", "Wasantha", "" ], [ "Seki", "Masatoshi", "" ], [ "Saito", "Hidenobu", "" ], [ "Ichiryu", "Ken", "" ], [ "Ohyama", "Yasuhiro", "" ] ]
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1402.1636
Petr Vabishchevich N.
Petr N. Vabishchevich
Numerical solving the boundary value problem for fractional powers of elliptic operators
18 pages, 17 figures
null
10.1016/j.jcp.2014.11.022
null
cs.NA math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A boundary value problem for a fractional power of the second-order elliptic operator is considered. It is solved numerically using a time-dependent problem for a pseudo-parabolic equation. For the auxiliary Cauchy problem, the standard two-level schemes with weights are applied. Stability conditions are obtained for the fully discrete schemes under the consideration. The numerical results are presented for a model two-dimensional boundary value problem wit a fractional power of an elliptic operator. The dependence of accuracy on grids in time and in space is studied.
[ { "created": "Fri, 7 Feb 2014 13:42:18 GMT", "version": "v1" } ]
2015-06-18
[ [ "Vabishchevich", "Petr N.", "" ] ]
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1402.1637
Wasantha Samarathunga
Wasantha Samarathunga, Masatoshi Seki, Hidenobu Saito, Ken Ichiryu, Yasuhiro Ohyama
Vertical Clustering of 3D Elliptical Helical Data
null
International Journal of Computer Trends and Technology, volume 6 number 2,Dec 2013
null
null
cs.CE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This research proposes an effective vertical clustering strategy of 3D data in an elliptical helical shape based on 2D geometry. The clustering object is an elliptical cross-sectioned metal pipe which is been bended in to an elliptical helical shape which is used in wearable muscle support designing for welfare industry. The aim of this proposed method is to maximize the vertical clustering (vertical partitioning) ability of surface data in order to run the product evaluation process addressed in research [2]. The experiment results prove that the proposed method outperforms the existing threshold no of clusters that preserves the vertical shape than applying the conventional 3D data. This research also proposes a new product testing strategy that provides the flexibility in computer aided testing by not restricting the sequence depending measurements which apply weight on measuring process. The clustering algorithms used for the experiments in this research are self-organizing map (SOM) and K-medoids.
[ { "created": "Fri, 7 Feb 2014 13:42:54 GMT", "version": "v1" } ]
2014-02-10
[ [ "Samarathunga", "Wasantha", "" ], [ "Seki", "Masatoshi", "" ], [ "Saito", "Hidenobu", "" ], [ "Ichiryu", "Ken", "" ], [ "Ohyama", "Yasuhiro", "" ] ]
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1402.1650
Francesco Borghesani
C. Braggio and A. F. Borghesani
A contactless microwave-based diagnostic tool for high repetition rate laser systems
4 pages, 5 figures, accepted for publication in Review of Scientific Instruments, to appear February 2014
null
10.1063/1.4865717
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on a novel electro-optic device for the diagnostics of high repetition rate laser systems. It is composed of a microwave receiver and of a second order nonlinear crystal, whose irradiation with a train of short laser pulses produces a time-dependent polarization in the crystal itself as a consequence of optical rectification. This process gives rise to the emission of microwave radiation that is detected by a receiver and is analyzed to infer the repetition rate and intensity of the pulses. We believe that this new method may overcome some of the limitations of photodetection techniques.
[ { "created": "Fri, 7 Feb 2014 14:26:26 GMT", "version": "v1" } ]
2014-03-05
[ [ "Braggio", "C.", "" ], [ "Borghesani", "A. F.", "" ] ]
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1402.1652
Tobias Kretz
Vidal Roca, Vicente Torres, Tobias Kretz, Karsten Lehmann, Ingmar Hofs\"a{\ss}
How to Apply Assignment Methods that were Developed for Vehicular Traffic to Pedestrian Microsimulations
contribution to PANAM 2014 conference
null
null
null
cs.CE cs.MA physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Applying assignment methods to compute user-equilibrium route choice is very common in traffic planning. It is common sense that vehicular traffic arranges in a user-equilibrium based on generalized costs in which travel time is a major factor. Surprisingly travel time has not received much attention for the route choice of pedestrians. In microscopic simulations of pedestrians the vastly dominating paradigm for the computation of the preferred walking direction is set into the direction of the (spatially) shortest path. For situations where pedestrians have travel time as primary determinant for their walking behavior it would be desirable to also have an assignment method in pedestrian simulations. To apply existing (road traffic) assignment methods with simulations of pedestrians one has to reduce the nondenumerably many possible pedestrian trajectories to a small subset of routes which represent the main, relevant, and significantly distinguished routing alternatives. All except one of these routes will mark detours, i.e. not the shortest connection between origin and destination. The proposed assignment method is intended to work with common operational models of pedestrian dynamics. These - as mentioned before - usually send pedestrians into the direction of the spatially shortest path. Thus, all detouring routes have to be equipped with intermediate destinations, such that pedestrians can do a detour as a piecewise connection of segments on which they walk into the direction of the shortest path. One has then to take care that the transgression from one segment to the following one no artifacts are introduced into the pedestrian trajectory.
[ { "created": "Fri, 7 Feb 2014 14:38:46 GMT", "version": "v1" } ]
2014-02-10
[ [ "Roca", "Vidal", "" ], [ "Torres", "Vicente", "" ], [ "Kretz", "Tobias", "" ], [ "Lehmann", "Karsten", "" ], [ "Hofsäß", "Ingmar", "" ] ]
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1402.1659
Chlo\'e Malbrunot
C. Malbrunot, P. Caradonna, M. Diermaier, N. Dilaver, S. Friedreich, B. Kolbinger, S. Lehner, R. Lundmark, O. Massiczek, B. Radics, C. Sauerzopf, M. Simon, E. Widmann, M. Wolf, B. Wunschek, J. Zmeskal
Spectroscopy Apparatus for the Measurement of The Hyperfine Structure of Antihydrogen
Proceedings of the 11th International Conference on Low Energy Antiproton Physics (LEAP 2013) held in Uppsala, Sweden, 10 to 15 June, 2013
null
10.1007/s10751-014-1013-z
null
physics.ins-det hep-ex physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The ASACUSA CUSP collaboration at the Antiproton Decelerator (AD) of CERN is planning to measure the ground-state hyperfine splitting of antihydrogen using an atomic spectroscopy beamline. We describe here the latest developments on the spectroscopy apparatus developed to be coupled to the antihydrogen production setup (CUSP).
[ { "created": "Fri, 7 Feb 2014 15:00:11 GMT", "version": "v1" } ]
2014-02-10
[ [ "Malbrunot", "C.", "" ], [ "Caradonna", "P.", "" ], [ "Diermaier", "M.", "" ], [ "Dilaver", "N.", "" ], [ "Friedreich", "S.", "" ], [ "Kolbinger", "B.", "" ], [ "Lehner", "S.", "" ], [ "Lundmark", "R.", "" ], [ "Massiczek", "O.", "" ], [ "Radics", "B.", "" ], [ "Sauerzopf", "C.", "" ], [ "Simon", "M.", "" ], [ "Widmann", "E.", "" ], [ "Wolf", "M.", "" ], [ "Wunschek", "B.", "" ], [ "Zmeskal", "J.", "" ] ]
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1402.1660
Alexander Igamberdiev
Alexander Igamberdiev, Andr\'e Schulz
A Duality Transform for Constructing Small Grid Embeddings of 3d Polytopes
Full version of the Graph Drawing 2013 conference version, 23 pages, 5 figures
null
null
null
cs.CG math.MG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the problem of how to obtain an integer realization of a 3d polytope when an integer realization of its dual polytope is given. We focus on grid embeddings with small coordinates and develop novel techniques based on Colin de Verdi\`ere matrices and the Maxwell-Cremona lifting method. We show that every truncated 3d polytope with n vertices can be realized on a grid of size O(n^{9log(6)+1}). Moreover, for every simplicial 3d polytope with n vertices with maximal vertex degree {\Delta} and vertices placed on an L x L x L grid, a dual polytope can be realized on an integer grid of size O(n L^{3\Delta + 9}). This implies that for a class C of simplicial 3d polytopes with bounded vertex degree and polynomial size grid embedding, the dual polytopes of C can be realized on a polynomial size grid as well.
[ { "created": "Fri, 7 Feb 2014 15:03:52 GMT", "version": "v1" }, { "created": "Sun, 12 Jul 2015 10:47:57 GMT", "version": "v2" }, { "created": "Mon, 25 Jan 2016 17:04:16 GMT", "version": "v3" } ]
2016-01-26
[ [ "Igamberdiev", "Alexander", "" ], [ "Schulz", "André", "" ] ]
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1402.1661
Jan Plato\v{s}
Milos Kudelka, Sarka Zehnalova and Jan Platos
Network Sampling Based on NN Representatives
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null
null
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The amount of large-scale real data around us increase in size very quickly and so does the necessity to reduce its size by obtaining a representative sample. Such sample allows us to use a great variety of analytical methods, whose direct application on original data would be infeasible. There are many methods used for different purposes and with different results. In this paper we outline a simple and straightforward approach based on analyzing the nearest neighbors (NN) that is generally applicable. This feature is illustrated on experiments with weighted networks and vector data. The properties of the representative sample show that the presented approach maintains very well internal data structures (e.g. clusters and density). Key technical parameters of the approach is low complexity and high scalability. This allows the application of this approach to the area of big data.
[ { "created": "Fri, 7 Feb 2014 15:09:18 GMT", "version": "v1" } ]
2014-02-10
[ [ "Kudelka", "Milos", "" ], [ "Zehnalova", "Sarka", "" ], [ "Platos", "Jan", "" ] ]
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1402.1662
David Gomez-Ullate
Juan Duque-Rodr\'iguez, David G\'omez-Ullate, Carlos Mej\'ia-Monasterio
Geometry-induced fluctuations of olfactory searches in bounded domains
7 pages, 8 figures, typed in revtex
null
null
null
cond-mat.stat-mech cond-mat.dis-nn physics.bio-ph physics.chem-ph q-bio.QM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In olfactory search an immobile target emits chemical molecules at constant rate. The molecules are transported by the medium which is assumed to be turbulent. Considering a searcher able to detect such chemical signals and whose motion follows the infotaxis strategy, we study the statistics of the first-passage time to the target when the searcher moves on a finite two-dimensional lattice of different geometries. Far from the target, where the concentration of chemicals is low the direction of the searcher's first movement is determined by the geometry of the domain and the topology of the lattice, inducing strong fluctuations on the average search time with respect to the initial position of the searcher. The domain is partitioned in well defined regions characterized by the direction of the first movement. If the search starts over the interface between two different regions, large fluctuations in the search time are observed.
[ { "created": "Fri, 7 Feb 2014 15:11:12 GMT", "version": "v1" } ]
2014-02-12
[ [ "Duque-Rodríguez", "Juan", "" ], [ "Gómez-Ullate", "David", "" ], [ "Mejía-Monasterio", "Carlos", "" ] ]
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1402.1666
Renaud Deguen
Renaud Deguen, Maylis Landeau, Peter Olson
Turbulent metal-silicate mixing, fragmentation, and equilibration in magma oceans
27 pages, 9 figures. Earth and Planetary Science Letters, 2014
null
10.1016/j.epsl.2014.02.007
null
physics.geo-ph physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Much of the Earth was built by high-energy impacts of planetesimals and embryos, many of these impactors already differentiated, with metallic cores of their own. Geochemical data provide critical information on the timing of accretion and the prevailing physical conditions, but their interpretation depends critically on the degree of metal-silicate chemical equilibration during core-mantle differentiation, which is poorly constrained. Efficient equilibration requires that the large volumes of iron derived from impactor cores mix with molten silicates down to scales small enough to allow fast metal-silicate mass transfer. Here we use fluid dynamics experiments to show that large metal blobs falling in a magma ocean mix with the molten silicate through turbulent entrainment, with fragmentation into droplets eventually resulting from the entrainment process. In our experiments, fragmentation of the dense fluid occurs after falling a distance equal to 3-4 times its initial diameter, at which point a sizable volume of ambient fluid has already been entrained and mixed with the dense falling fluid. Contrary to what has usually been assumed, we demonstrate that fragmentation of the metallic phase into droplets may not be required for efficient equilibration: turbulent mixing, by drastically increasing the metal-silicate interfacial area, may result in fast equilibration even before fragmentation. Efficient re-equilibration is predicted for impactors of size small compared to the magma ocean depth. In contrast, a much smaller re-equilibration degree is predicted in the case of large impacts for which the impactor core diameter approaches the magma ocean thickness.
[ { "created": "Fri, 7 Feb 2014 15:29:54 GMT", "version": "v1" } ]
2014-03-05
[ [ "Deguen", "Renaud", "" ], [ "Landeau", "Maylis", "" ], [ "Olson", "Peter", "" ] ]
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1402.1668
John Osborne
John David Osborne, Binod Gyawali, Thamar Solorio
Evaluation of YTEX and MetaMap for clinical concept recognition
6 pages, working notes to the ShareClef eHealth 2013 Shared Task
null
null
null
cs.IR cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We used MetaMap and YTEX as a basis for the construc- tion of two separate systems to participate in the 2013 ShARe/CLEF eHealth Task 1[9], the recognition of clinical concepts. No modifications were directly made to these systems, but output concepts were filtered using stop concepts, stop concept text and UMLS semantic type. Con- cept boundaries were also adjusted using a small collection of rules to increase precision on the strict task. Overall MetaMap had better per- formance than YTEX on the strict task, primarily due to a 20% perfor- mance improvement in precision. In the relaxed task YTEX had better performance in both precision and recall giving it an overall F-Score 4.6% higher than MetaMap on the test data. Our results also indicated a 1.3% higher accuracy for YTEX in UMLS CUI mapping.
[ { "created": "Fri, 7 Feb 2014 15:33:44 GMT", "version": "v1" } ]
2014-02-10
[ [ "Osborne", "John David", "" ], [ "Gyawali", "Binod", "" ], [ "Solorio", "Thamar", "" ] ]
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1402.1670
Evo Busseniers
Evo Busseniers
Hierarchical organization versus self-organization
15 pages +figures
null
null
null
cs.MA cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we try to define the difference between hierarchical organization and self-organization. Organization is defined as a structure with a function. So we can define the difference between hierarchical organization and self-organization both on the structure as on the function. In the next two chapters these two definitions are given. For the structure we will use some existing definitions in graph theory, for the function we will use existing theory on (self-)organization. In the third chapter we will look how these two definitions agree. Finally we give a conclusion.
[ { "created": "Fri, 7 Feb 2014 15:45:59 GMT", "version": "v1" } ]
2014-02-10
[ [ "Busseniers", "Evo", "" ] ]
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1402.1673
Petr Tichavsky
Petr Tichavsky, Anh Huy Phan, and Andrzej Cichocki
Non-Orthogonal Tensor Diagonalization
The manuscript was revised deeply, but the main idea is the same. The algorithm has changed significantly
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cs.NA stat.OT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Tensor diagonalization means transforming a given tensor to an exactly or nearly diagonal form through multiplying the tensor by non-orthogonal invertible matrices along selected dimensions of the tensor. It is generalization of approximate joint diagonalization (AJD) of a set of matrices. In particular, we derive (1) a new algorithm for symmetric AJD, which is called two-sided symmetric diagonalization of order-three tensor, (2) a similar algorithm for non-symmetric AJD, also called general two-sided diagonalization of an order-3 tensor, and (3) an algorithm for three-sided diagonalization of order-3 or order-4 tensors. The latter two algorithms may serve for canonical polyadic (CP) tensor decomposition, and they can outperform other CP tensor decomposition methods in terms of computational speed under the restriction that the tensor rank does not exceed the tensor multilinear rank. Finally, we propose (4) similar algorithms for tensor block diagonalization, which is related to the tensor block-term decomposition.
[ { "created": "Fri, 7 Feb 2014 15:50:21 GMT", "version": "v1" }, { "created": "Mon, 16 Feb 2015 14:01:09 GMT", "version": "v2" }, { "created": "Fri, 1 Jul 2016 17:18:59 GMT", "version": "v3" } ]
2016-07-04
[ [ "Tichavsky", "Petr", "" ], [ "Phan", "Anh Huy", "" ], [ "Cichocki", "Andrzej", "" ] ]
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1402.1674
Xiaojun Feng
Xiaojun Feng, Qian Zhang, Jin Zhang
A Hybrid Pricing Framework for TV White Space Database
12 pages, 9 figures, accepted by IEEE Transactions on Wireless Communications in Jan. 2014
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
According to the recent rulings of the Federal Communications Commission (FCC), TV white spaces (TVWS) can now be accessed by secondary users (SUs) after a list of vacant TV channels is obtained via a geo-location database. Proper business models are therefore essential for database operators to manage geo-location databases. Database access can be simultaneously priced under two different schemes: the registration scheme and the service plan scheme. In the registration scheme, the database reserves part of the TV bandwidth for registered White Space Devices (WSDs). In the service plan scheme, the WSDs are charged according to their queries. In this paper, we investigate the business model for the TVWS database under a hybrid pricing scheme. We consider the scenario where a database operator employs both the registration scheme and the service plan scheme to serve the SUs. The SUs' choices of different pricing schemes are modeled as a non-cooperative game and we derive distributed algorithms to achieve Nash Equilibrium (NE). Considering the NE of the SUs, the database operator optimally determines pricing parameters for both pricing schemes in terms of bandwidth reservation, registration fee and query plans.
[ { "created": "Thu, 6 Feb 2014 05:57:40 GMT", "version": "v1" } ]
2014-02-10
[ [ "Feng", "Xiaojun", "" ], [ "Zhang", "Qian", "" ], [ "Zhang", "Jin", "" ] ]
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1402.1678
Govinda Clos
Govinda Clos, Martin Enderlein, Ulrich Warring, Dietrich Leibfried, Tobias Schaetz
Decoherence-assisted spectroscopy of a single Mg$^+$ ion
5 pages, 4 figures
Phys. Rev. Lett. 112, 113003 (2014)
10.1103/PhysRevLett.112.113003
null
physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe a high-resolution spectroscopy method, in which the detection of single excitation events is enhanced by a complete loss of coherence of a superposition of two ground states. Thereby, transitions of a single isolated atom nearly at rest are recorded efficiently with high signal-to-noise ratios. Spectra display symmetric line shapes without stray-light background from spectroscopy probes. We employ this method on a $^{25}$Mg$^+$ ion to measure one, two, and three-photon transition frequencies from the 3S ground state to the 3P, 3D, and 4P excited states, respectively. Our results are relevant for astrophysics and searches for drifts of fundamental constants. Furthermore, the method can be extended to other transitions, isotopes, and species. The currently achieved fractional frequency uncertainty of $5 \times 10^{-9}$ is not limited by the method.
[ { "created": "Fri, 7 Feb 2014 16:06:52 GMT", "version": "v1" } ]
2014-03-25
[ [ "Clos", "Govinda", "" ], [ "Enderlein", "Martin", "" ], [ "Warring", "Ulrich", "" ], [ "Leibfried", "Dietrich", "" ], [ "Schaetz", "Tobias", "" ] ]
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1402.1682
Sergiy Vorobyov A.
Arash Khabbazibasmenj, Aboulnasr Hassanien, and Sergiy A. Vorobyov
How Many Beamforming Vectors Generate the Same Beampattern?
12 pages, 3 figures, 2 tables, Submitted to the IEEE Signal Processing Letters in February 2014
IEEE Signal Processing Letters, vol. 22, no. 10, pp. 1609-1613, Oct. 2015
10.1109/LSP.2015.2417220
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this letter, we address the fundamental question of how many beamforming vectors exist which generate the same beampattern? The question is relevant to many fields such as, for example, array processing, radar, wireless communications, data compression, dimensionality reduction, and biomedical engineering. The desired property of having the same beampattern for different columns of a beamspace transformation matrix (beamforming vectors) often plays a key importance in practical applications. The result is that at most 2^{M-1}-1 beamforming vectors with the same beampattern can be generated from any given beamforming vector. Here M is the dimension of the beamforming vector. At the constructive side, the answer to this question allows for computationally efficient techniques for the beamspace transformation design. Indeed, one can start with a single beamforming vector, which gives a desired beampattern, and generate a number of other beamforming vectors, which give absolutely the same beampattern, in a computationally efficient way. We call the initial beamforming vector as the mother beamforming vector. One possible procedure for generating all possible new beamforming vectors with the same beampattern from the mother beamforming vector is proposed. The application of the proposed analysis to the transmit beamspace design in multiple-input multiple-output radar is also given.
[ { "created": "Fri, 7 Feb 2014 16:24:53 GMT", "version": "v1" } ]
2016-03-03
[ [ "Khabbazibasmenj", "Arash", "" ], [ "Hassanien", "Aboulnasr", "" ], [ "Vorobyov", "Sergiy A.", "" ] ]
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1402.1683
Carol Niznik
Dr. Carol A. Niznik
Homeland Defense and Security Universal Interface Software (HDUIS) Protocol Communication Gateway UIS Protocol Enhancements, Alterations and Attachments
null
The International Journal of Soft Computing and Software Engineering [JSCSE], Vol. 3, No. 3, pp.517-523, 2013
10.7321/jscse.v3.n3.79
null
cs.CY cs.CR
http://creativecommons.org/licenses/publicdomain/
The Universal Interface Software(UIS) Protocol was a Theater Missile Defense Gateway Protocol which linked the Strategic Defense Initiative(SDI) Architecture Killer Satellite Software Protocol to the National Test Bed Simulation Software Protocol to enable neural network shock loop operation when ICBMS were approaching the SDI Shield. A Gateway Software is required for Homeland Defense and Security Systems to communicate the sensor information from hardware and software boxes at airports and government buildings and other locations to the Global Information Grid(GIG). Therefore, a Homeland Defense and Security UIS(HDSUIS) Protocol is achieved by UIS conversion to HDSUIS for Thresholds Stabilization and GIG and terrorist sensor Enhancements, Homeland Defense and Security Lagrangian equation and GIG simulation facility timing chart Alterations, and two Catastrophe Theory Protocol Attachments to the UIS Geometric software structure inner cube. This UIS Protocol conversion to the HDSUIS Protocol will track and provide a Congestion Controlled, i.e.,prevention of deadlock and livelock, communication of (1) Shoe bombers and copycat shoe bombers, (2) deeply buried and imbedded boxes with explosives, (3) damage to lase1 equipment, (4) shoulder missile fired armament, and (5) surface to air missiles from their sensor equipment to the Global Information Grid with Theater Missile Defense Characteristics. The Homeland Defense and Security GNNO(Geometric Neural Network Overlay) Protocol will be derived as a conversion of the UIS GNNO Protocol.
[ { "created": "Fri, 7 Feb 2014 16:27:02 GMT", "version": "v1" } ]
2014-02-10
[ [ "Niznik", "Dr. Carol A.", "" ] ]
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1402.1690
Alberto Ramos
A. Ramos and F. Ramos
Heliostat blocking and shadowing efficiency in the video-game era
LaTeX. 8 pages, 8 figures
null
null
DESY 14-009
math.OC cs.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Blocking and shadowing is one of the key effects in designing and evaluating a thermal central receiver solar tower plant. Therefore it is convenient to develop efficient algorithms to compute the area of an heliostat blocked or shadowed by the rest of the field. In this paper we explore the possibility of using very efficient clipping algorithms developed for the video game and imaging industry to compute the blocking and shadowing efficiency of a solar thermal plant layout. We propose an algorithm valid for arbitrary position, orientation and size of the heliostats. This algorithm turns out to be very accurate, free of assumptions and fast. We show the feasibility of the use of this algorithm to the optimization of a solar plant by studying a couple of examples in detail.
[ { "created": "Fri, 7 Feb 2014 16:54:46 GMT", "version": "v1" } ]
2014-02-10
[ [ "Ramos", "A.", "" ], [ "Ramos", "F.", "" ] ]
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1402.1691
Adnane Osmane
A. Osmane and A.M. Hamza
Relativistic surfatron process for Landau resonant electrons in radiation belts
Published in Nonlinear Processes of Geophysics but available in here without some random typos introduced by publisher
null
10.5194/npg-21-115-2014, 2014
null
physics.space-ph physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent theoretical studies of the nonlinear wave-particle interactions for relativistic particles have shown that Landau resonant orbits could be efficiently accelerated along the mean background magnetic field for propagation angles $\theta$ in close proximity to a critical propagation $\theta_\textrm{c}$ associated with a Hopf--Hopf bifurcation condition. In this report, we extend previous studies to reach greater modeling capacities for the study of electrons in radiation belts by including longitudinal wave effects and inhomogeneous magnetic fields. We find that even though both effects can limit the surfatron acceleration of electrons in radiation belts, gains in energy of the order of 100 keV, taking place on the order of ten milliseconds, are sufficiently strong for the mechanism to be relevant to radiation belt dynamics.
[ { "created": "Fri, 7 Feb 2014 16:56:01 GMT", "version": "v1" } ]
2014-02-10
[ [ "Osmane", "A.", "" ], [ "Hamza", "A. M.", "" ] ]
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1402.1693
Rahul Chavhan
Rahul D. Chavhan, Sachin U. Chavhan, Ganesh B. Chavan
Real Time Industrial Monitoring System
5 pages 7 figures
null
null
null
cs.OH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Industries are the biggest workplace all over the world, also there are large number of peoples involves as a worker and most of them are work as a machine operator. There are many systems developed for industrial work place, some of them, monitors machine processes and some do monitoring and control of machine parameters. Such as speed, temperature, production batch count etc. However there is no such system available that provides monitoring of operator during their work is in progress at workplace. This paper proposes the monitoring of the operators and the machines, by Real time Operator -Machine Allocation and monitoring system (Omams). Omams allocates a work machine to worker at entry point itself. It uses automation with RFID and one of the standards of wireless communication method. The system can be industry specific. Through this research paper our approach is to make fair allocation of machine to the operator in industry and reduce hassle for efficiency calculations.
[ { "created": "Fri, 7 Feb 2014 16:56:55 GMT", "version": "v1" } ]
2014-02-10
[ [ "Chavhan", "Rahul D.", "" ], [ "Chavhan", "Sachin U.", "" ], [ "Chavan", "Ganesh B.", "" ] ]
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1402.1695
Laurent Hilico
Laurent Hilico, Jean-Philippe Karr, Albane Douillet, Paul Indelicato, Sebastian Wolf, and Ferdinand Schmidt Kaler
Cooling antihydrogen ions for the free-fall experiment GBAR
10 pages, 5 figures
Int. J. Mod. Phys. Conf. Ser. 30, 1460269 (2014)
10.1142/S2010194514602695
null
physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss an experimental approach allowing to prepare antihydrogen atoms for the GBAR experiment. We study the feasibility of all necessary experimental steps: The capture of incoming $\bar{\rm H}^+$ ions at keV energies in a deep linear RF trap, sympathetic cooling by laser cooled Be$^+$ ions, transfer to a miniaturized trap and Raman sideband cooling of an ion pair to the motional ground state, and further reducing the momentum of the wavepacket by adiabatic opening of the trap. For each step, we point out the experimental challenges and discuss the efficiency and characteristic times, showing that capture and cooling are possible within a few seconds.
[ { "created": "Fri, 7 Feb 2014 17:00:43 GMT", "version": "v1" } ]
2017-02-20
[ [ "Hilico", "Laurent", "" ], [ "Karr", "Jean-Philippe", "" ], [ "Douillet", "Albane", "" ], [ "Indelicato", "Paul", "" ], [ "Wolf", "Sebastian", "" ], [ "Kaler", "Ferdinand Schmidt", "" ] ]
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1402.1697
Abhishek Halder
Abhishek Halder, Raktim Bhattacharya
Geodesic Density Tracking with Applications to Data Driven Modeling
8 pages, 7 figures
null
null
null
cs.SY math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Many problems in dynamic data driven modeling deals with distributed rather than lumped observations. In this paper, we show that the Monge-Kantorovich optimal transport theory provides a unifying framework to tackle such problems in the systems-control parlance. Specifically, given distributional measurements at arbitrary instances of measurement availability, we show how to derive dynamical systems that interpolate the observed distributions along the geodesics. We demonstrate the framework in the context of three specific problems: (i) \emph{finding a feedback control} to track observed ensembles over finite-horizon, (ii) \emph{finding a model} whose prediction matches the observed distributional data, and (iii) \emph{refining a baseline model} that results a distribution-level prediction-observation mismatch. We emphasize how the three problems can be posed as variants of the optimal transport problem, but lead to different types of numerical methods depending on the problem context. Several examples are given to elucidate the ideas.
[ { "created": "Fri, 7 Feb 2014 17:17:54 GMT", "version": "v1" } ]
2014-02-10
[ [ "Halder", "Abhishek", "" ], [ "Bhattacharya", "Raktim", "" ] ]
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1402.1699
Mauro Jaskelioff
Mauro Jaskelioff and Russell O'Connor
A Representation Theorem for Second-Order Functionals
null
null
null
null
cs.PL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Representation theorems relate seemingly complex objects to concrete, more tractable ones. In this paper, we take advantage of the abstraction power of category theory and provide a general representation theorem for a wide class of second-order functionals which are polymorphic over a class of functors. Types polymorphic over a class of functors are easily representable in languages such as Haskell, but are difficult to analyse and reason about. The concrete representation provided by the theorem is easier to analyse, but it might not be as convenient to implement. Therefore, depending on the task at hand, the change of representation may prove valuable in one direction or the other. We showcase the usefulness of the representation theorem with a range of examples. Concretely, we show how the representation theorem can be used to show that traversable functors are finitary containers, how parameterised coalgebras relate to very well-behaved lenses, and how algebraic effects might be implemented in a functional language.
[ { "created": "Fri, 7 Feb 2014 17:21:14 GMT", "version": "v1" }, { "created": "Wed, 4 Feb 2015 16:32:31 GMT", "version": "v2" } ]
2015-02-05
[ [ "Jaskelioff", "Mauro", "" ], [ "O'Connor", "Russell", "" ] ]
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1402.1706
Romain Peretti
Guillaume Gomard (INL), Romain Peretti (INL), S\'egol\`ene Callard (INL), Xianqin Meng (INL), R\'emy Artinyan (INL), Thierry Deschamps (INL), Pere Roca I. Cabarrocas (LPICM), Emmanuel Drouard (INL, ECL), Christian Seassal (INL, ECL)
Blue light absorption enhancement based on vertically channelling modes in nano-holes arrays
null
Applied Physics Letters 104, 5 (2014) 051119
10.1063/1.4864267
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the specific optical regime occurring at short wavelengths, in the high absorption regime, in silicon thin-films patterned by periodically arranged nano-holes. Near-field scanning optical microscopy indicates that the incoming light is coupled to vertically channelling modes. Optical modelling and simulations show that the light, travelling inside the low-index regions, is absorbed at the direct vicinity of the nano-holes sidewalls. This channelling regime should be taken into account for light management in optoelectronic devices.
[ { "created": "Fri, 7 Feb 2014 17:37:42 GMT", "version": "v1" } ]
2014-02-10
[ [ "Gomard", "Guillaume", "", "INL" ], [ "Peretti", "Romain", "", "INL" ], [ "Callard", "Ségolène", "", "INL" ], [ "Meng", "Xianqin", "", "INL" ], [ "Artinyan", "Rémy", "", "INL" ], [ "Deschamps", "Thierry", "", "INL" ], [ "Cabarrocas", "Pere Roca I.", "", "LPICM" ], [ "Drouard", "Emmanuel", "", "INL, ECL" ], [ "Seassal", "Christian", "", "INL, ECL" ] ]
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1402.1707
Norman G\"urlebeck
Alexander Milke and Andr\'e Kubelka-Lange and Norman G\"urlebeck and Benny Rievers and Sven Herrmann and Thilo Schuldt and Claus Braxmaier
Atom Interferometry in Space: Thermal Management and Magnetic Shielding
v2: minor changes to agree with published version; 8 pages, 6 figures
Rev. Sci. Instrum. 85, 083105 (2014)
10.1063/1.4890560
null
physics.ins-det astro-ph.IM physics.atom-ph physics.space-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Atom interferometry is an exciting tool to probe fundamental physics. It is considered especially apt to test the universality of free fall by using two different sorts of atoms. The increasing sensitivity required for this kind of experiment sets severe requirements on its environments, instrument control, and systematic effects. This can partially be mitigated by going to space as was proposed, for example, in the Spacetime Explorer and Quantum Equivalence Principle Space Test (STE-QUEST) mission. However, the requirements on the instrument are still very challenging. For example, the specifications of the STE-QUEST mission imply that the Feshbach coils of the atom interferometer are allowed to change their radius only by about 260 nm or 2.6E-4% due to thermal expansion although they consume an average power of 22 W. Also Earth's magnetic field has to be suppressed by a factor of 10E5. We show in this article that with the right design such thermal and magnetic requirements can indeed be met and that these are not an impediment for the exciting physics possible with atom interferometers in space.
[ { "created": "Fri, 7 Feb 2014 17:37:47 GMT", "version": "v1" }, { "created": "Mon, 18 Aug 2014 09:21:25 GMT", "version": "v2" } ]
2014-08-19
[ [ "Milke", "Alexander", "" ], [ "Kubelka-Lange", "André", "" ], [ "Gürlebeck", "Norman", "" ], [ "Rievers", "Benny", "" ], [ "Herrmann", "Sven", "" ], [ "Schuldt", "Thilo", "" ], [ "Braxmaier", "Claus", "" ] ]
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1402.1713
Damien Chablat
Liang Ma (IRCCyN, DIE), Wei Zhang (DIE), Bo Hu (DIE), Damien Chablat (IRCCyN), Fouad Bennis (IRCCyN), Fran\c{c}ois Guillaume
Determination of subject-specific muscle fatigue rates under static fatiguing operations
null
Ergonomics 56, 12 (2013) 1889-1900
null
null
cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cumulative local muscle fatigue may lead to potential musculoskeletal disorder (MSD) risks {\color{red}, and subject-specific muscle fatigability needs to be considered to reduce potential MSD risks.} This study was conducted to determine local muscle fatigue rate at shoulder joint level based on an exponential function derived from a muscle fatigue model. Forty male subjects participated in a fatiguing operation under a static posture with a range of relative force levels (14% - 33%). Remaining maximum muscle strengths were measured after different fatiguing sessions. The time course of strength decline was fitted to the exponential function. Subject-specific fatigue rates of shoulder joint moment strength were determined. Good correspondence ($R^2>0.8$) was found in the regression of the majority (35 out of 40 subjects). Substantial inter-individual variability in fatigue rate was found and discussed.
[ { "created": "Fri, 7 Feb 2014 17:42:17 GMT", "version": "v1" } ]
2014-02-10
[ [ "Ma", "Liang", "", "IRCCyN, DIE" ], [ "Zhang", "Wei", "", "DIE" ], [ "Hu", "Bo", "", "DIE" ], [ "Chablat", "Damien", "", "IRCCyN" ], [ "Bennis", "Fouad", "", "IRCCyN" ], [ "Guillaume", "François", "" ] ]
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1402.1718
Nicolas Courtois
Nicolas T. Courtois, Lear Bahack
On Subversive Miner Strategies and Block Withholding Attack in Bitcoin Digital Currency
not published elsewhere
null
null
null
cs.CR cs.CE cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Bitcoin is a "crypto currency", a decentralized electronic payment scheme based on cryptography. Bitcoin economy grows at an incredibly fast rate and is now worth some 10 billions of dollars. Bitcoin mining is an activity which consists of creating (minting) the new coins which are later put into circulation. Miners spend electricity on solving cryptographic puzzles and they are also gatekeepers which validate bitcoin transactions of other people. Miners are expected to be honest and have some incentives to behave well. However. In this paper we look at the miner strategies with particular attention paid to subversive and dishonest strategies or those which could put bitcoin and its reputation in danger. We study in details several recent attacks in which dishonest miners obtain a higher reward than their relative contribution to the network. In particular we revisit the concept of block withholding attacks and propose a new concrete and practical block withholding attack which we show to maximize the advantage gained by rogue miners. RECENT EVENTS: it seems that the attack was recently executed, see Section XI-A.
[ { "created": "Tue, 28 Jan 2014 13:54:02 GMT", "version": "v1" }, { "created": "Mon, 10 Feb 2014 14:20:19 GMT", "version": "v2" }, { "created": "Sun, 16 Mar 2014 12:11:10 GMT", "version": "v3" }, { "created": "Sun, 6 Jul 2014 23:14:56 GMT", "version": "v4" }, { "created": "Tue, 2 Dec 2014 16:45:26 GMT", "version": "v5" } ]
2014-12-03
[ [ "Courtois", "Nicolas T.", "" ], [ "Bahack", "Lear", "" ] ]
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1402.1720
Yair Censor
Blake Schultze, Micah Witt, Yair Censor, Reinhard Schulte, and Keith Evan Schubert
Performance of Hull-Detection Algorithms For Proton Computed Tomography Reconstruction
Contemporary Mathematics, accepted for publication
null
null
null
cs.CV physics.med-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Proton computed tomography (pCT) is a novel imaging modality developed for patients receiving proton radiation therapy. The purpose of this work was to investigate hull-detection algorithms used for preconditioning of the large and sparse linear system of equations that needs to be solved for pCT image reconstruction. The hull-detection algorithms investigated here included silhouette/space carving (SC), modified silhouette/space carving (MSC), and space modeling (SM). Each was compared to the cone-beam version of filtered backprojection (FBP) used for hull-detection. Data for testing these algorithms included simulated data sets of a digital head phantom and an experimental data set of a pediatric head phantom obtained with a pCT scanner prototype at Loma Linda University Medical Center. SC was the fastest algorithm, exceeding the speed of FBP by more than 100 times. FBP was most sensitive to the presence of noise. Ongoing work will focus on optimizing threshold parameters in order to define a fast and efficient method for hull-detection in pCT image reconstruction.
[ { "created": "Fri, 7 Feb 2014 17:58:16 GMT", "version": "v1" } ]
2014-02-10
[ [ "Schultze", "Blake", "" ], [ "Witt", "Micah", "" ], [ "Censor", "Yair", "" ], [ "Schulte", "Reinhard", "" ], [ "Schubert", "Keith Evan", "" ] ]
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1402.1724
Zhida Xu
Zhida Xu, Logan Liu
Quick Detection of Contaminants Leaching from Polypropylene Centrifuge Tube with Surface Enhanced Raman Spectroscopy and Ultra Violet Absorption Spectroscopy
null
Z. Xu, M. R. Gartia, C. J. Choi, J. Jiang, Y. Chen, B. T. Cunningham, and G. L. Liu, Journal of Raman Spectroscopy, 42, 1939-1944 2011
10.1002/jrs.2950
null
q-bio.QM physics.chem-ph q-bio.BM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Anomalous surface enhanced Raman scattering (SERS) peaks are identified for liquid sample stored in polypropylene centrifuge tubes (PP tube) for months. We observed the unexpected Raman peaks during experiments for Thiamine Hydrochloride aqueous solution stored in PP tube for two months. In order to identify the contaminants we have performed SERS experiments for de-ionized water (DI water) stored in polypropylene centrifuge tube for two months and compared them with fresh DI water sample. We have also carried out Ultra Violet (UV) absorption spectra for both fresh and contaminated water. We believe that the water is contaminated because of chemicals leaching from the PP tube. From the GC-MS data the main contaminant was found to be Phthalic acid and its derivatives. Further SERS and UV absorption experiment for Phthalic acid correlates well with the anomalous peaks identified earlier. We qualitatively confirmed the identification and quantitatively estimated the concentration of suspect contaminants as between 1uM and 10uM with both SERS and UV absorption spectroscopy. With UV absorption spectroscopy, we precisely estimate the concentration as 2.1uM. We have shown that sample in PP tube can be contaminated due to leaching chemicals upon long term storage and suggested SERS and UV-absorption spectroscopy as two quick and simple techniques to detect the contamination
[ { "created": "Fri, 7 Feb 2014 18:23:32 GMT", "version": "v1" } ]
2016-10-26
[ [ "Xu", "Zhida", "" ], [ "Liu", "Logan", "" ] ]
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1402.1726
Yi Li
Anna C. Gilbert, Yi Li, Ely Porat, Martin J. Strauss
For-all Sparse Recovery in Near-Optimal Time
null
ACM Transactions on Algorithms, Vol. 13, No. 3, pp 32:1--32:26, 2017
null
null
cs.DS cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An approximate sparse recovery system in $\ell_1$ norm consists of parameters $k$, $\epsilon$, $N$, an $m$-by-$N$ measurement $\Phi$, and a recovery algorithm, $\mathcal{R}$. Given a vector, $\mathbf{x}$, the system approximates $x$ by $\widehat{\mathbf{x}} = \mathcal{R}(\Phi\mathbf{x})$, which must satisfy $\|\widehat{\mathbf{x}}-\mathbf{x}\|_1 \leq (1+\epsilon)\|\mathbf{x}-\mathbf{x}_k\|_1$. We consider the 'for all' model, in which a single matrix $\Phi$, possibly 'constructed' non-explicitly using the probabilistic method, is used for all signals $\mathbf{x}$. The best existing sublinear algorithm by Porat and Strauss (SODA'12) uses $O(\epsilon^{-3} k\log(N/k))$ measurements and runs in time $O(k^{1-\alpha}N^\alpha)$ for any constant $\alpha > 0$. In this paper, we improve the number of measurements to $O(\epsilon^{-2} k \log(N/k))$, matching the best existing upper bound (attained by super-linear algorithms), and the runtime to $O(k^{1+\beta}\textrm{poly}(\log N,1/\epsilon))$, with a modest restriction that $\epsilon \leq (\log k/\log N)^{\gamma}$, for any constants $\beta,\gamma > 0$. When $k\leq \log^c N$ for some $c>0$, the runtime is reduced to $O(k\textrm{poly}(N,1/\epsilon))$. With no restrictions on $\epsilon$, we have an approximation recovery system with $m = O(k/\epsilon \log(N/k)((\log N/\log k)^\gamma + 1/\epsilon))$ measurements.
[ { "created": "Fri, 7 Feb 2014 18:34:37 GMT", "version": "v1" }, { "created": "Tue, 7 Mar 2017 14:06:46 GMT", "version": "v2" } ]
2017-03-08
[ [ "Gilbert", "Anna C.", "" ], [ "Li", "Yi", "" ], [ "Porat", "Ely", "" ], [ "Strauss", "Martin J.", "" ] ]
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1402.1727
Jing Liu
Lei Sheng, Jie Zhang, and Jing Liu
Liquid Metal Transformers
null
null
null
null
cond-mat.soft cond-mat.mes-hall cond-mat.mtrl-sci physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The room temperature liquid metal is quickly emerging as an important functional material in a variety of areas like chip cooling, 3D printing or printed electronics etc. With diverse capabilities in electrical, thermal and flowing behaviors, such fluid owns many intriguing properties that had never been anticipated before. Here, we show a group of unconventional phenomena occurring on the liquid metal objects. Through applying electrical field on the liquid metals immersed in water, a series of complex transformation behaviors such as self-assembling of a sheet of liquid metal film into a single sphere, quick mergences of separate metal droplets, controlled self-rotation and planar locomotion of liquid metal objects can be realized. Meanwhile, it was also found that two accompanying water vortexes were induced and reliably swirled near the rotating liquid metal sphere. Further, effects of the shape, size, voltage, orientation and geometries of the electrodes to control the liquid metal transformers were clarified. Such events are hard to achieve otherwise on rigid metal or conventional liquid spheres. This finding has both fundamental and practical significances which suggest a generalized way of making smart soft machine, collecting discrete metal fluids, as well as flexibly manipulating liquid metal objects including accompanying devices.
[ { "created": "Thu, 30 Jan 2014 06:12:15 GMT", "version": "v1" } ]
2014-02-10
[ [ "Sheng", "Lei", "" ], [ "Zhang", "Jie", "" ], [ "Liu", "Jing", "" ] ]
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1402.1730
Zhida Xu
Zhida Xu, Logan Liu
Surface plasmon enhanced broadband spectrophotometry on black silver substrates
null
Applied Physics Letter,24, 241904 2011
10.1063/1.3599551
null
cond-mat.mtrl-sci physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate surface plasmon-induced enhancements in optical imaging and spectroscopy on silver coated silicon nanocones which we call black silver substrate. The black silver substrate with dense and homogeneous nanocone forest structure is fabricated on wafer level with a mass producible nanomanufacturing method. The black silver substrate is able to efficiently trap and convert incident photons into localized plasmons in a broad wavelength range, which permits the enhancement in optical absorption from UV to NIR range by 12 times, the visible fluorescence enhancement of ~30 times and the NIR Raman scattering enhancement factor up to ~108. We show a considerable potential of the black silver substrate in high sensitivity and broadband optical sensing and imaging of chemical and biological molecules.
[ { "created": "Fri, 7 Feb 2014 18:49:29 GMT", "version": "v1" } ]
2014-02-10
[ [ "Xu", "Zhida", "" ], [ "Liu", "Logan", "" ] ]
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1402.1732
Christian Franck
Christian Franck
Dining Cryptographers with 0.924 Verifiable Collision Resolution
11 pages, 3 figures
Annales UMCS, Informatica. Volume 14, Issue 1, Pages 49-59, ISSN (Online) 2083-3628, October 2014
10.2478/umcsinfo-2014-0007
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The dining cryptographers protocol implements a multiple access channel in which senders and recipients are anonymous. A problem is that a malicious participant can disrupt communication by deliberately creating collisions. We propose a computationally secure dining cryptographers protocol with collision resolution that achieves a maximum stable throughput of 0.924 messages per round and which allows to easily detect disruptors.
[ { "created": "Fri, 7 Feb 2014 18:53:40 GMT", "version": "v1" }, { "created": "Tue, 17 Jun 2014 15:27:13 GMT", "version": "v2" }, { "created": "Sat, 3 Jan 2015 21:06:50 GMT", "version": "v3" } ]
2015-01-06
[ [ "Franck", "Christian", "" ] ]
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1402.1733
Zhida Xu
Zhida Xu, Logan Liu
Nanoreplicated positive and inverted sub-micron polymer pyramids array for surface enhanced Raman spectroscopy (SERS)
null
Journal of Nanophotonics, 5, 053526 2011
10.1117/1.3663259
null
physics.optics cond-mat.mes-hall cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate gold coated polymer surface enhanced Raman scattering (SERS) substrates with a pair of complementary structures--positive and inverted pyramids array structures fabricated by multiple-step molding and replication process. The uniform SERS enhancement factors over the entire device surfaces were measured as 7.2 X 10^4 for positive pyramids substrate while 1.6 X 10^6 for inverted pyramids substrate with Rhodamine 6G as the target analyte. Based on the optical reflection measurement and FDTD simulation result, the enhancement factor difference is attributed to plasmon resonance matching and to SERS "hot spots ". With this simple, fast and versatile complementary molding process, we can produce polymer SERS substrates with extremely low cost, high throughput and high repeatability.
[ { "created": "Fri, 7 Feb 2014 18:57:34 GMT", "version": "v1" } ]
2014-02-10
[ [ "Xu", "Zhida", "" ], [ "Liu", "Logan", "" ] ]
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1402.1736
Eric Vanden-Eijnden
Maria Cameron and Eric Vanden-Eijnden
Flows in Complex Networks: Theory, Algorithms, and Application to Lennard-Jones Cluster Rearrangement
32 pages, 13 figures
null
10.1007/s10955-014-0997-8
null
cond-mat.stat-mech cs.CE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A set of analytical and computational tools based on transition path theory (TPT) is proposed to analyze flows in complex networks. Specifically, TPT is used to study the statistical properties of the reactive trajectories by which transitions occur between specific groups of nodes on the network. Sampling tools are built upon the outputs of TPT that allow to generate these reactive trajectories directly, or even transition paths that travel from one group of nodes to the other without making any detour and carry the same probability current as the reactive trajectories. These objects permit to characterize the mechanism of the transitions, for example by quantifying the width of the tubes by which these transitions occur, the location and distribution of their dynamical bottlenecks, etc. These tools are applied to a network modeling the dynamics of the Lennard-Jones cluster with 38 atoms (LJ38) and used to understand the mechanism by which this cluster rearranges itself between its two most likely states at various temperatures.
[ { "created": "Wed, 29 Jan 2014 10:00:25 GMT", "version": "v1" } ]
2015-06-18
[ [ "Cameron", "Maria", "" ], [ "Vanden-Eijnden", "Eric", "" ] ]
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1402.1737
Zhida Xu
Zhida Xu, Logan Liu
Lithography-free sub-100nm nanocone array antireflection layer for low-cost silicon solar cell
null
Applied Optics, 19, 4430-4435 2012
10.1364/AO.51.004430
null
physics.optics cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
High density and uniformity sub-100nm surface oxidized silicon nanocone forest structure is created and integrated onto the existing texturization microstructures on photovoltaic device surface by a one-step high throughput plasma enhanced texturization method. We suppressed the broadband optical reflection on chemically textured grade-B silicon solar cells for up to 70.25% through this nanomanufacturing method. The performance of the solar cell is improved with the short circuit current increased by 7.1%, fill factor increased by 7.0%, conversion efficiency increased by 14.66%. Our method demonstrates the potential to improve the photovoltaic device performance with low cost high and throughput nanomanufacturing technology.
[ { "created": "Fri, 7 Feb 2014 19:17:27 GMT", "version": "v1" } ]
2014-02-10
[ [ "Xu", "Zhida", "" ], [ "Liu", "Logan", "" ] ]
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1402.1739
Zhida Xu
Zhida Xu, Logan Liu
Monolithic Integrations of Slanted Silicon Nanostructures on 3D Microstructures and Their Application to Surface Enhanced Raman Spectroscopy
null
Journal of Physical Chemistry C, 45, 24161-24170 2012
10.1021/jp308162c
null
cond-mat.mes-hall physics.optics q-bio.BM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrated fabrication of black silicon with slanted nanocone array on both planar and 3D micro and meso scale structures produced by a high-throughput lithography-free oblique-angle plasma etching process. Nanocones with gradual change in height were created on the same piece of silicon. The relation between the slanted angle of nanocones and incident angle of directional plasma is experimentally investigated. In order to demonstrate the monolithic integration of nanostructures on micro and meso scale non-planar surfaces, nanocone forest is fabricated on non-planar silicon surfaces in various morphologies such as silicon atomic force microscopy (AFM) tips and pyramidal pits. By integrating nanocones on inverse silicon micro-pyramid array devices, we further improved the surface enhanced Raman scattering (SERS) enhancement property of this optimized commercial SERS substrate by several folds even when using 66% less noble metal coating. We investigated the length gradient dependence and asymmetric properties of SERS effects for slanted nanocone with polarized excitation. This versatile and angle-controllable nanocone fabrication and monolithic 3D nano-micro-meso integration method provides new dimensions for production and optimization of SERS and other nanophotonic sensors.
[ { "created": "Fri, 7 Feb 2014 19:25:27 GMT", "version": "v1" } ]
2014-02-10
[ [ "Xu", "Zhida", "" ], [ "Liu", "Logan", "" ] ]
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1402.1741
Zhida Xu
Zhida Xu, Logan Liu
Elastomeric 2D Grating and Hemispherical Optofluidic Chamber for Multifunctional Fluidic Sensing
null
Journal of the Optical Society of America A, 30(12), 2466-2472 2013
10.1364/JOSAA.30.002466
null
physics.optics cond-mat.mtrl-sci q-bio.QM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present an optofluidic sensor based on an elastomeric two-dimensional (2D) grating integrated inside a hemispherical fluid chamber. Laser beam is diffracted before (reflection) and after (transmission) going through the grating and liquid in the dome chamber. The sensing mechanism is investigated and simulated with a finite difference time domain (FDTD) based electromagnetic (EM) method. For experiment, by analyzing the size, power and shape of the 2D diffraction patterns, we can retrieve multiple parameters of the liquid including the refractive index, pressure and opacity with high sensitivity. We demonstrate that glucose concentration can be monitored when mixed in different concentrated phosphate buffered saline (PBS) solution. The free-solution binding of bovine serum albumin (BSA) and anti-BSA IgG is detected with this optical sensor. This low-cost, multifunctional and reliable optofluidic sensor has the potential to be used as monitor of biofluid such as blood in hemodialysis.
[ { "created": "Fri, 7 Feb 2014 19:39:37 GMT", "version": "v1" } ]
2014-02-10
[ [ "Xu", "Zhida", "" ], [ "Liu", "Logan", "" ] ]
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1402.1743
Lisa Poyneer
L. A. Poyneer, T. McCarville, T. Pardini, D. Palmer, A. Brooks, M. J. Pivovaroff, B. Macintosh
Sub-nanometer flattening of a 45-cm long, 45-actuator x-ray deformable mirror
Revised version accepted by Applied Optics 24 Apr 2014
null
10.1364/AO.53.003404
LLNL-JRNL-649073
physics.ins-det astro-ph.IM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have built a 45-cm long x-ray deformable mirror of super-polished single-crystal silicon that has 45 actuators along the tangential axis. After assembly the surface height error was 19 nm rms. With use of high-precision visible-light metrology and precise control algorithms, we have actuated the x-ray deformable mirror and flattened its entire surface to 0.7 nm rms controllable figure error. This is, to our knowledge, the first sub-nanometer active flattening of a substrate longer than 15 cm.
[ { "created": "Fri, 7 Feb 2014 19:45:11 GMT", "version": "v1" }, { "created": "Thu, 24 Apr 2014 16:55:52 GMT", "version": "v2" } ]
2015-06-18
[ [ "Poyneer", "L. A.", "" ], [ "McCarville", "T.", "" ], [ "Pardini", "T.", "" ], [ "Palmer", "D.", "" ], [ "Brooks", "A.", "" ], [ "Pivovaroff", "M. J.", "" ], [ "Macintosh", "B.", "" ] ]
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1402.1745
Pavel A. Andreev
A. Yu. Ivanov, P. A. Andreev, L. S. Kuz'menkov
Balance equations in semi-relativistic quantum hydrodynamics
29 pages
Int. J. Mod. Phys. B, v. 28, p. 1450132 (2014)
10.1142/S021797921450132X
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Method of the quantum hydrodynamics has been applied in quantum plasmas studies. As the first step in our consideration, derivation of classical semi-relativistic (i. e. described by the Darwin Lagrangian on microscopic level) hydrodynamical equations is given after a brief review of method development. It provides better distinguishing between classic and quantum semi-relativistic effects. Derivation of the classical equations is interesting since it is made by a natural, but not very widespread method. This derivation contains explicit averaging of the microscopic dynamics. Derivation of corresponding quantum hydrodynamic equations is presented further. Equations are obtained in the five-momentum approximation including the continuity equation, Euler and energy balance equations. It is shown that relativistic corrections lead to presence of new quantum terms in expressions for a force field, a work field etc. The semi-relativistic generalization of the quantum Bohm potential is obtained. Quantum part of the energy current, which is an analog of the quantum Bohm potential for the energy evolution equation, is derived. The Langmuir wave dispersion in semi-relativistic quantum plasmas, corresponding to the Darwin Lagrangian, is also considered to demonstrate contribution of semi-relativistic effects on basic plasma phenomenon.
[ { "created": "Fri, 7 Feb 2014 19:52:52 GMT", "version": "v1" } ]
2014-06-24
[ [ "Ivanov", "A. Yu.", "" ], [ "Andreev", "P. A.", "" ], [ "Kuz'menkov", "L. S.", "" ] ]
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1402.1746
Nicol\`o Fabbiane
N. Fabbiane, O. Semeraro, S. Bagheri and D.S. Henningson
Adaptive and model-based control theory applied to convectively unstable flows
MATLAB\copyright code available (url link in the paper) Controllability/Observability section had been added
null
null
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Research on active control for the delay of laminar-turbulent transition in boundary layers has made a significant progress in the last two decades, but the employed strategies have been many and dispersed. Using one framework, we review model-based techniques, such as linear-quadratic regulators, and model-free adaptive methods, such as least-mean square filters. The former are supported by a elegant and powerful theoretical basis, whereas the latter may provide a more practical approach in the presence of complex disturbance environments, that are difficult to model. We compare the methods with a particular focus on efficiency, practicability and robustness to uncertainties. Each step is exemplified on the one-dimensional linearized Kuramoto-Sivashinsky equation, that shows many similarities with the initial linear stages of the transition process of the flow over a flat plate. Also, the source code for the examples are provided.
[ { "created": "Thu, 6 Feb 2014 16:18:36 GMT", "version": "v1" }, { "created": "Fri, 14 Mar 2014 10:50:55 GMT", "version": "v2" } ]
2014-03-17
[ [ "Fabbiane", "N.", "" ], [ "Semeraro", "O.", "" ], [ "Bagheri", "S.", "" ], [ "Henningson", "D. S.", "" ] ]
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1402.1750
Jean-Baptiste Doc
Samy Missoum, Christophe Vergez (LMA_CNRS), Jean-Baptiste Doc (LMA_CNRS)
Explicit Mapping of Acoustic Regimes For Wind Instruments
null
null
10.1016/j.jsv.2014.05.017
null
physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper proposes a methodology to map the various acoustic regimes of wind instruments. The maps can be generated in a multi-dimensional space consisting of design, control parameters, and initial conditions. The bound- aries of the maps are obtained explicitly in terms of the parameters using a support vector machine (SVM) classifier as well as a dedicated adaptive sam- pling scheme. The approach is demonstrated on a simplified clarinet model for which several maps are generated based on different criteria. Examples of computation of the probability of occurrence of a specific acoustic regime are also provided. In addition, the approach is demonstrated on a design optimization example for optimal intonation.
[ { "created": "Fri, 7 Feb 2014 20:20:38 GMT", "version": "v1" } ]
2015-06-18
[ [ "Missoum", "Samy", "", "LMA_CNRS" ], [ "Vergez", "Christophe", "", "LMA_CNRS" ], [ "Doc", "Jean-Baptiste", "", "LMA_CNRS" ] ]
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1402.1754
Zoltan Szabo
Zoltan Szabo, Arthur Gretton, Barnabas Poczos, Bharath Sriperumbudur
Two-stage Sampled Learning Theory on Distributions
v6: accepted at AISTATS-2015 for oral presentation; final version; code: https://bitbucket.org/szzoli/ite/; extension to the misspecified and vector-valued case: http://arxiv.org/abs/1411.2066
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math.ST cs.LG math.FA stat.ML stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We focus on the distribution regression problem: regressing to a real-valued response from a probability distribution. Although there exist a large number of similarity measures between distributions, very little is known about their generalization performance in specific learning tasks. Learning problems formulated on distributions have an inherent two-stage sampled difficulty: in practice only samples from sampled distributions are observable, and one has to build an estimate on similarities computed between sets of points. To the best of our knowledge, the only existing method with consistency guarantees for distribution regression requires kernel density estimation as an intermediate step (which suffers from slow convergence issues in high dimensions), and the domain of the distributions to be compact Euclidean. In this paper, we provide theoretical guarantees for a remarkably simple algorithmic alternative to solve the distribution regression problem: embed the distributions to a reproducing kernel Hilbert space, and learn a ridge regressor from the embeddings to the outputs. Our main contribution is to prove the consistency of this technique in the two-stage sampled setting under mild conditions (on separable, topological domains endowed with kernels). For a given total number of observations, we derive convergence rates as an explicit function of the problem difficulty. As a special case, we answer a 15-year-old open question: we establish the consistency of the classical set kernel [Haussler, 1999; Gartner et. al, 2002] in regression, and cover more recent kernels on distributions, including those due to [Christmann and Steinwart, 2010].
[ { "created": "Fri, 7 Feb 2014 20:37:59 GMT", "version": "v1" }, { "created": "Mon, 21 Apr 2014 11:35:58 GMT", "version": "v2" }, { "created": "Sun, 4 May 2014 19:29:36 GMT", "version": "v3" }, { "created": "Sat, 7 Jun 2014 17:42:06 GMT", "version": "v4" }, { "created": "Sat, 25 Oct 2014 21:03:01 GMT", "version": "v5" }, { "created": "Mon, 26 Jan 2015 22:20:59 GMT", "version": "v6" } ]
2015-01-28
[ [ "Szabo", "Zoltan", "" ], [ "Gretton", "Arthur", "" ], [ "Poczos", "Barnabas", "" ], [ "Sriperumbudur", "Bharath", "" ] ]
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1402.1755
Sascha Grusche
Sascha Grusche
Spectral synthesis provides 2-D videos on a 1-D screen with 360{\deg}-visibility and mirror-immunity
Preprint, 9 pages, 15 figures, 27 references; patent application filed for SNS and PICS on Dec 31, 2013
null
10.1364/AO.53.000674
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Spatial-light-modulator (SLM)-based tunable sources have complex setups. A simpler setup, comprising an SLM-projector and a dispersive element, synthesizes light as effectively, based on a Superposition of Newtonian Spectra (SNS). As a generalization of SNS, two-dimensional (2-D) grayscale videos are spectrally encoded on a one-dimensional (1-D), translucent screen, and viewed through another dispersive element. This Projected-Image Circumlineascopy (PICS) produces semitransparent, rainbow-coloured, virtual 2-D videos that face every viewer anywhere around the 1-D screen. They are invariant under reflection of the 1-D screen in mirrors parallel to it. SNS bandwidth and PICS image geometry are calculated using geometric optics and Dispersion Diagrams.
[ { "created": "Fri, 7 Feb 2014 20:46:54 GMT", "version": "v1" } ]
2015-06-18
[ [ "Grusche", "Sascha", "" ] ]
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1402.1757
Ron Rouhani
Tao Mao, Laura Ray
Frequency-Based Patrolling with Heterogeneous Agents and Limited Communication
null
null
null
null
cs.MA cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper investigates multi-agent frequencybased patrolling of intersecting, circle graphs under conditions where graph nodes have non-uniform visitation requirements and agents have limited ability to communicate. The task is modeled as a partially observable Markov decision process, and a reinforcement learning solution is developed. Each agent generates its own policy from Markov chains, and policies are exchanged only when agents occupy the same or adjacent nodes. This constraint on policy exchange models sparse communication conditions over large, unstructured environments. Empirical results provide perspectives on convergence properties, agent cooperation, and generalization of learned patrolling policies to new instances of the task. The emergent behavior indicates learned coordination strategies between heterogeneous agents for patrolling large, unstructured regions as well as the ability to generalize to dynamic variation in node visitation requirements.
[ { "created": "Fri, 7 Feb 2014 20:51:00 GMT", "version": "v1" } ]
2014-02-10
[ [ "Mao", "Tao", "" ], [ "Ray", "Laura", "" ] ]
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1402.1759
Smita Jolania
Smita Jolania, Sandeep Toshniwal
Performance Improvement of OFDM System Using Iterative Signal Clipping With Various Window Techniques for PAPR Reduction
5 pages,7 figures,Published with "International Journal of Engineering Trends and Technology (IJETT)"
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null
null
cs.IT math.IT
http://creativecommons.org/licenses/by/3.0/
OFDM signals demonstrates high fluctuations termed as Peak to Average Power Ratio (PAPR).The problem of OFDM is the frequent occurrence of high Peaks in the time domain signal which in turn reduces the efficiency of transmit high power amplifier.In this paper we discussed clipping and filtering technique which is easy to implement and reduces the amount of PAPR by clipping the peak of the maximum power signal.This technique clips the OFDM signal to a predefined threshold and uses a filter to eliminate the out-of-band radiation.Moreover, analysis of PAPR is given by varying different filters.The study is focused to reduce PAPR by iterative clipping and filtering method. The symbol error rate performances for different modulation techniques have been countered.Each clipping noise sample is multiplied by a window function(e.g.Hanning,Kaiser, or Hamming) to suppress the out-of-band noise.It is shown that clipping and different filtering techniques for improvement in the SER performance and provides further reduction in PAPR.
[ { "created": "Fri, 7 Feb 2014 09:53:42 GMT", "version": "v1" } ]
2014-02-11
[ [ "Jolania", "Smita", "" ], [ "Toshniwal", "Sandeep", "" ] ]
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1402.1761
Muriel Medard
Linda Zeger, Muriel M\'edard
On Scalability of Wireless Networks: A Practical Primer for Large Scale Cooperation
7 pages, 4 figures
null
null
null
cs.IT cs.NI math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An intuitive overview of the scalability of a variety of types of wireless networks is presented. Simple heuris- tic arguments are demonstrated here for scaling laws presented in other works, as well as for conditions not previously considered in the literature. Unicast and multicast messages, topology, hierarchy, and effects of reliability protocols are discussed. We show how two key factors, bottlenecks and erasures, can often domi- nate the network scaling behavior. Scaling of through- put or delay with the number of transmitting nodes, the number of receiving nodes, and the file size is described.
[ { "created": "Fri, 7 Feb 2014 16:11:35 GMT", "version": "v1" } ]
2016-11-26
[ [ "Zeger", "Linda", "" ], [ "Médard", "Muriel", "" ] ]
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1402.1763
Jens Jasche
Jens Jasche (1 and 2) and Guilhem Lavaux (1 and 2) ((1) CNRS IAP, (2) Sorbonnes Universit\'es UPMC IAP)
Matrix-free Large Scale Bayesian inference in cosmology
9 pages, 2 figures, submitted to MNRAS
null
10.1093/mnras/stu2479
null
astro-ph.CO physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work we propose a new matrix-free implementation of the Wiener sampler which is traditionally applied to high dimensional analysis when signal covariances are unknown. Specifically, the proposed method addresses the problem of jointly inferring a high dimensional signal and its corresponding covariance matrix from a set of observations. Our method implements a Gibbs sampling adaptation of the previously presented messenger approach, permitting to cast the complex multivariate inference problem into a sequence of uni-variate random processes. In this fashion, the traditional requirement of inverting high dimensional matrices is completely eliminated from the inference process, resulting in an efficient algorithm that is trivial to implement. Using cosmic large scale structure data as a showcase, we demonstrate the capabilities of our Gibbs sampling approach by performing a joint analysis of three dimensional density fields and corresponding power-spectra from Gaussian mock catalogues. These tests clearly demonstrate the ability of the algorithm to accurately provide measurements of the three dimensional density field and its power-spectrum and corresponding uncertainty quantification. Moreover, these tests reveal excellent numerical and statistical efficiency which will generally render the proposed algorithm a valuable addition to the toolbox of large scale Bayesian inference in cosmology and astrophysics.
[ { "created": "Fri, 7 Feb 2014 21:00:00 GMT", "version": "v1" } ]
2015-06-18
[ [ "Jasche", "Jens", "", "1 and 2" ], [ "Lavaux", "Guilhem", "", "1 and 2" ] ]
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1402.1774
Ali Makhdoumi
Ali Makhdoumi, Salman Salamatian, Nadia Fawaz, Muriel Medard
From the Information Bottleneck to the Privacy Funnel
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null
null
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We focus on the privacy-utility trade-off encountered by users who wish to disclose some information to an analyst, that is correlated with their private data, in the hope of receiving some utility. We rely on a general privacy statistical inference framework, under which data is transformed before it is disclosed, according to a probabilistic privacy mapping. We show that when the log-loss is introduced in this framework in both the privacy metric and the distortion metric, the privacy leakage and the utility constraint can be reduced to the mutual information between private data and disclosed data, and between non-private data and disclosed data respectively. We justify the relevance and generality of the privacy metric under the log-loss by proving that the inference threat under any bounded cost function can be upper-bounded by an explicit function of the mutual information between private data and disclosed data. We then show that the privacy-utility tradeoff under the log-loss can be cast as the non-convex Privacy Funnel optimization, and we leverage its connection to the Information Bottleneck, to provide a greedy algorithm that is locally optimal. We evaluate its performance on the US census dataset.
[ { "created": "Fri, 7 Feb 2014 21:23:10 GMT", "version": "v1" }, { "created": "Wed, 26 Feb 2014 20:54:18 GMT", "version": "v2" }, { "created": "Thu, 27 Feb 2014 01:38:04 GMT", "version": "v3" }, { "created": "Sun, 11 May 2014 21:27:18 GMT", "version": "v4" }, { "created": "Tue, 30 Sep 2014 03:28:10 GMT", "version": "v5" } ]
2014-10-01
[ [ "Makhdoumi", "Ali", "" ], [ "Salamatian", "Salman", "" ], [ "Fawaz", "Nadia", "" ], [ "Medard", "Muriel", "" ] ]
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1402.1776
Neelesh Patankar
H.-Y. Hsu and Neelesh A. Patankar
Electrokinetic instability in the sharp interface limit: The perpendicular electric field case
31 pages, 9 figures
null
null
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, instability at an interface between two miscible liquids with identical mechanical properties but different electrical conductivities is analyzed in the presence of an electric field that is perpendicular to the interface. A parallel electric field case was considered in a previous work [1]. A sharp Eulerian interface is considered between the two miscible liquids. Linear stability analysis leads to an analytic solution for the critical condition of instability. The mechanism of instability is analyzed. Key differences between the perpendicular and parallel electric field cases are discussed. The effect of a microchannel geometry is studied and the relevant non-dimensional parameters are identified.
[ { "created": "Fri, 7 Feb 2014 21:35:57 GMT", "version": "v1" } ]
2014-02-11
[ [ "Hsu", "H. -Y.", "" ], [ "Patankar", "Neelesh A.", "" ] ]
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1402.1777
Flavio Figueiredo
Flavio Figueiredo, Jussara M. Almeida, Marcos Andr\'e Gon\c{c}alves, Fabr\'icio Benevenuto
On the Dynamics of Social Media Popularity: A YouTube Case Study
Extended version of a paper published in ACM WSDM 2011. Pre-print of the paper accepted for publication on the ACM Transactions on Internet Tecnology
null
null
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Understanding the factors that impact the popularity dynamics of social media can drive the design of effective information services, besides providing valuable insights to content generators and online advertisers. Taking YouTube as case study, we analyze how video popularity evolves since upload, extracting popularity trends that characterize groups of videos. We also analyze the referrers that lead users to videos, correlating them, features of the video and early popularity measures with the popularity trend and total observed popularity the video will experience. Our findings provide fundamental knowledge about popularity dynamics and its implications for services such as advertising and search.
[ { "created": "Fri, 7 Feb 2014 21:37:06 GMT", "version": "v1" }, { "created": "Mon, 7 Apr 2014 02:40:41 GMT", "version": "v2" }, { "created": "Fri, 17 Oct 2014 12:59:18 GMT", "version": "v3" } ]
2014-10-20
[ [ "Figueiredo", "Flavio", "" ], [ "Almeida", "Jussara M.", "" ], [ "Gonçalves", "Marcos André", "" ], [ "Benevenuto", "Fabrício", "" ] ]
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1402.1778
Emilio Ferrara
Santa Agreste, Pasquale De Meo, Emilio Ferrara, Sebastiano Piccolo, Alessandro Provetti
Analysis of a heterogeneous social network of humans and cultural objects
12 pages, 9 figures - Transactions on Systems, Man and Cybernetics: Systems - under review
IEEE Transactions on Systems, Man, and Cybernetics: Systems, vol.45, no.4, pp.559,570, April 2015
10.1109/TSMC.2014.2378215
null
cs.SI cs.CY physics.data-an physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Modern online social platforms enable their members to be involved in a broad range of activities like getting friends, joining groups, posting/commenting resources and so on. In this paper we investigate whether a correlation emerges across the different activities a user can take part in. To perform our analysis we focused on aNobii, a social platform with a world-wide user base of book readers, who like to post their readings, give ratings, review books and discuss them with friends and fellow readers. aNobii presents a heterogeneous structure: i) part social network, with user-to-user interactions, ii) part interest network, with the management of book collections, and iii) part folksonomy, with books that are tagged by the users. We analyzed a complete and anonymized snapshot of aNobii and we focused on three specific activities a user can perform, namely her tagging behavior, her tendency to join groups and her aptitude to compile a wishlist reporting the books she is planning to read. In this way each user is associated with a tag-based, a group-based and a wishlist-based profile. Experimental analysis carried out by means of Information Theory tools like entropy and mutual information suggests that tag-based and group-based profiles are in general more informative than wishlist-based ones. Furthermore, we discover that the degree of correlation between the three profiles associated with the same user tend to be small. Hence, user profiling cannot be reduced to considering just any one type of user activity (although important) but it is crucial to incorporate multiple dimensions to effectively describe users preferences and behavior.
[ { "created": "Fri, 7 Feb 2014 21:39:57 GMT", "version": "v1" } ]
2015-04-15
[ [ "Agreste", "Santa", "" ], [ "De Meo", "Pasquale", "" ], [ "Ferrara", "Emilio", "" ], [ "Piccolo", "Sebastiano", "" ], [ "Provetti", "Alessandro", "" ] ]
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1402.1780
Saleh Soltan
Saleh Soltan, Dorian Mazauric, and Gil Zussman
Cascading Failures in Power Grids - Analysis and Algorithms
null
null
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper focuses on cascading line failures in the transmission system of the power grid. Recent large-scale power outages demonstrated the limitations of percolation- and epid- emic-based tools in modeling cascades. Hence, we study cascades by using computational tools and a linearized power flow model. We first obtain results regarding the Moore-Penrose pseudo-inverse of the power grid admittance matrix. Based on these results, we study the impact of a single line failure on the flows on other lines. We also illustrate via simulation the impact of the distance and resistance distance on the flow increase following a failure, and discuss the difference from the epidemic models. We then study the cascade properties, considering metrics such as the distance between failures and the fraction of demand (load) satisfied after the cascade (yield). We use the pseudo-inverse of admittance matrix to develop an efficient algorithm to identify the cascading failure evolution, which can be a building block for cascade mitigation. Finally, we show that finding the set of lines whose removal has the most significant impact (under various metrics) is NP-Hard and introduce a simple heuristic for the minimum yield problem. Overall, the results demonstrate that using the resistance distance and the pseudo-inverse of admittance matrix provides important insights and can support the development of efficient algorithms.
[ { "created": "Fri, 7 Feb 2014 21:47:31 GMT", "version": "v1" } ]
2014-02-11
[ [ "Soltan", "Saleh", "" ], [ "Mazauric", "Dorian", "" ], [ "Zussman", "Gil", "" ] ]
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1402.1783
Jason J Corso
Caiming Xiong, David Johnson, Jason J. Corso
Active Clustering with Model-Based Uncertainty Reduction
14 pages, 8 figures, submitted to TPAMI (second version just fixes a missing reference and format)
null
null
null
cs.LG cs.CV stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Semi-supervised clustering seeks to augment traditional clustering methods by incorporating side information provided via human expertise in order to increase the semantic meaningfulness of the resulting clusters. However, most current methods are \emph{passive} in the sense that the side information is provided beforehand and selected randomly. This may require a large number of constraints, some of which could be redundant, unnecessary, or even detrimental to the clustering results. Thus in order to scale such semi-supervised algorithms to larger problems it is desirable to pursue an \emph{active} clustering method---i.e. an algorithm that maximizes the effectiveness of the available human labor by only requesting human input where it will have the greatest impact. Here, we propose a novel online framework for active semi-supervised spectral clustering that selects pairwise constraints as clustering proceeds, based on the principle of uncertainty reduction. Using a first-order Taylor expansion, we decompose the expected uncertainty reduction problem into a gradient and a step-scale, computed via an application of matrix perturbation theory and cluster-assignment entropy, respectively. The resulting model is used to estimate the uncertainty reduction potential of each sample in the dataset. We then present the human user with pairwise queries with respect to only the best candidate sample. We evaluate our method using three different image datasets (faces, leaves and dogs), a set of common UCI machine learning datasets and a gene dataset. The results validate our decomposition formulation and show that our method is consistently superior to existing state-of-the-art techniques, as well as being robust to noise and to unknown numbers of clusters.
[ { "created": "Fri, 7 Feb 2014 22:13:03 GMT", "version": "v1" }, { "created": "Fri, 14 Feb 2014 02:53:32 GMT", "version": "v2" } ]
2014-02-17
[ [ "Xiong", "Caiming", "" ], [ "Johnson", "David", "" ], [ "Corso", "Jason J.", "" ] ]
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1402.1784
Matthew Perkett
Matthew R. Perkett and Michael F. Hagan
Using Markov State Models to Study Self-Assembly
12 pages, 11 figures
null
10.1063/1.4878494
null
physics.bio-ph cond-mat.stat-mech q-bio.BM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Markov state models (MSMs) have been demonstrated to be a powerful method for computationally studying intramolecular processes such as protein folding and macromolecular conformational changes. In this article, we present a new approach to construct MSMs that is applicable to modeling a broad class of multi-molecular assembly reactions. Distinct structures formed during assembly are distinguished by their undirected graphs, which are defined by strong subunit interactions. Spatial inhomogeneities of free subunits are accounted for using a recently developed Gaussian-based signature. Simplifications to this state identification are also investigated. The feasibility of this approach is demonstrated on two different coarse-grained models for virus self-assembly. We find good agreement between the dynamics predicted by the MSMs and long, unbiased simulations, and that the MSMs can reduce overall simulation time by orders of magnitude.
[ { "created": "Fri, 7 Feb 2014 22:15:37 GMT", "version": "v1" } ]
2015-06-18
[ [ "Perkett", "Matthew R.", "" ], [ "Hagan", "Michael F.", "" ] ]
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1402.1786
Neelesh Patankar
Yong Chen and Neelesh A. Patankar
Fluctuating Immersed Material (FIMAT) Dynamics for Fully Resolved Simulation of the Brownian Motion of Particles
37 pages, 7 figures
null
null
null
physics.flu-dyn cs.NA math.NA physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Fluctuating hydrodynamics based techniques have been developed in recent years for the simulation of Brownian motion of particles. These mesoscale simulation tools are viable approaches for problems where molecular dynamics simulations may be deemed expensive. We have developed a rigid constraint-based formulation where the key idea is to assume that the entire domain is a fluctuating fluid. Rigid motion constraints are then imposed in regions that are occupied by rigid particles. The resulting solution gives the Brownian motion of the particles. This approach is shown to be viable for the simulation of long time scale diffusive behavior as well as for short time scale dynamics by using two separate solution techniques. Test cases are reported to validate the approach and to establish its efficacy.
[ { "created": "Fri, 7 Feb 2014 22:19:13 GMT", "version": "v1" } ]
2014-02-11
[ [ "Chen", "Yong", "" ], [ "Patankar", "Neelesh A.", "" ] ]
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1402.1789
Dimitar Bakalov
Stephan Schiller, Dimitar Bakalov, Vladimir I. Korobov
Simple Molecules and Clocks
null
null
null
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The precise measurement of transition frequencies in cold, trapped molecules has applications in fundamental physics, and extremely high accuracies are desirable. We determine suitable candidates by considering simple molecules with a single electron, for which the external-field shift coefficients can be calculated with high precision. Our calculations show that $\Htwop$ exhibits particular transitions whose fractional uncertainties may reach $2\times10^{-17}$ at room temperature. We also generalize the method of composite frequencies, introducing tailored linear combinations of individual transition frequencies that are free of the major systematic shifts, independent of the strength of the external perturbing fields. By applying this technique, the uncertainty should be reduced to the $10^{-18}$ range for both $\Htwop$ and $\HDp$. Thus, the theoretical results demonstrate that these molecules are of metrological relevance for future studies.
[ { "created": "Fri, 7 Feb 2014 22:30:33 GMT", "version": "v1" } ]
2014-02-11
[ [ "Schiller", "Stephan", "" ], [ "Bakalov", "Dimitar", "" ], [ "Korobov", "Vladimir I.", "" ] ]
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1402.1792
Mehrdad Mahdavi
Mehrdad Mahdavi, Lijun Zhang, and Rong Jin
Binary Excess Risk for Smooth Convex Surrogates
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null
null
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cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In statistical learning theory, convex surrogates of the 0-1 loss are highly preferred because of the computational and theoretical virtues that convexity brings in. This is of more importance if we consider smooth surrogates as witnessed by the fact that the smoothness is further beneficial both computationally- by attaining an {\it optimal} convergence rate for optimization, and in a statistical sense- by providing an improved {\it optimistic} rate for generalization bound. In this paper we investigate the smoothness property from the viewpoint of statistical consistency and show how it affects the binary excess risk. We show that in contrast to optimization and generalization errors that favor the choice of smooth surrogate loss, the smoothness of loss function may degrade the binary excess risk. Motivated by this negative result, we provide a unified analysis that integrates optimization error, generalization bound, and the error in translating convex excess risk into a binary excess risk when examining the impact of smoothness on the binary excess risk. We show that under favorable conditions appropriate choice of smooth convex loss will result in a binary excess risk that is better than $O(1/\sqrt{n})$.
[ { "created": "Fri, 7 Feb 2014 23:02:50 GMT", "version": "v1" } ]
2014-02-11
[ [ "Mahdavi", "Mehrdad", "" ], [ "Zhang", "Lijun", "" ], [ "Jin", "Rong", "" ] ]
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1402.1794
Jesse Meyer
Jesse G. Meyer
In silico Proteome Cleavage Reveals Iterative Digestion Strategy for High Sequence Coverage
10 pages of text/references followed by figure/table legends, six figures, and one table
ISRN Computational Biology 2014
10.1155/2014/960902
null
q-bio.GN cs.CE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the post-genome era, biologists have sought to measure the complete complement of proteins, termed proteomics. Currently, the most effective method to measure the proteome is with shotgun, or bottom-up, proteomics, in which the proteome is digested into peptides that are identified followed by protein inference. Despite continuous improvements to all steps of the shotgun proteomics workflow, observed proteome coverage is often low; some proteins are identified by a single peptide sequence. Complete proteome sequence coverage would allow comprehensive characterization of RNA splicing variants and all post translational modifications, which would drastically improve the accuracy of biological models. There are many reasons for the sequence coverage deficit, but ultimately peptide length determines sequence observability. Peptides that are too short are lost because they match many protein sequences and their true origin is ambiguous. The maximum observable peptide length is determined by several analytical challenges. This paper explores computationally how peptide lengths produced from several common proteome digestion methods limit observable proteome coverage. Iterative proteome cleavage strategies are also explored. These simulations reveal that maximized proteome coverage can be achieved by use of an iterative digestion protocol involving multiple proteases and chemical cleavages that theoretically allow 91.1% proteome coverage.
[ { "created": "Fri, 7 Feb 2014 23:13:48 GMT", "version": "v1" } ]
2018-11-30
[ [ "Meyer", "Jesse G.", "" ] ]
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1402.1797
Krzysztof Gawedzki
Gregory Falkovich and Krzysztof Gawedzki
Turbulence on hyperbolic plane: the fate of inverse cascade
45 pages, 6 figures, eqs. (2.6) and (4.8) and few misprints corrected, sec. 6 shortened, reference [15] added
null
10.1007/s10955-014-0995-x
null
nlin.CD cond-mat.stat-mech hep-th physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe ideal incompressible hydrodynamics on the hyperbolic plane which is an infinite surface of constant negative curvature. We derive equations of motion, general symmetries and conservation laws, and then consider turbulence with the energy density linearly increasing with time due to action of small-scale forcing. In a flat space, such energy growth is due to an inverse cascade, which builds a constant part of the velocity autocorrelation function proportional to time and expanding in scales, while the moments of the velocity difference saturate during a time depending on the distance. For the curved space, we analyze the long-time long-distance scaling limit, that lives in a degenerate conical geometry, and find that the energy-containing mode linearly growing with time is not constant in space. The shape of the velocity correlation function indicates that the energy builds up in vortical rings of arbitrary diameter but of width comparable to the curvature radius of the hyperbolic plane. The energy current across scales does not increase linearly with the scale, as in a flat space, but reaches a maximum around the curvature radius. That means that the energy flux through scales decreases at larger scales so that the energy is transferred in a non-cascade way, that is the inverse cascade spills over to all larger scales where the energy pumped into the system is cumulated in the rings. The time-saturated part of the spectral density of velocity fluctuations contains a finite energy per unit area, unlike in the flat space where the time-saturated spectrum behaves as k^{-5/3}.
[ { "created": "Fri, 7 Feb 2014 23:28:29 GMT", "version": "v1" }, { "created": "Sun, 30 Mar 2014 16:36:56 GMT", "version": "v2" } ]
2015-06-18
[ [ "Falkovich", "Gregory", "" ], [ "Gawedzki", "Krzysztof", "" ] ]
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1402.1801
Sayedmasoud Hashemi Amroabadi
SayedMasoud Hashemi, Soosan Beheshti, Patrick R. Gill, Narinder S. Paul, Richard S.C. Cobbold
Efficient Low Dose X-ray CT Reconstruction through Sparsity-Based MAP Modeling
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stat.AP cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Ultra low radiation dose in X-ray Computed Tomography (CT) is an important clinical objective in order to minimize the risk of carcinogenesis. Compressed Sensing (CS) enables significant reductions in radiation dose to be achieved by producing diagnostic images from a limited number of CT projections. However, the excessive computation time that conventional CS-based CT reconstruction typically requires has limited clinical implementation. In this paper, we first demonstrate that a thorough analysis of CT reconstruction through a Maximum a Posteriori objective function results in a weighted compressive sensing problem. This analysis enables us to formulate a low dose fan beam and helical cone beam CT reconstruction. Subsequently, we provide an efficient solution to the formulated CS problem based on a Fast Composite Splitting Algorithm-Latent Expected Maximization (FCSA-LEM) algorithm. In the proposed method we use pseudo polar Fourier transform as the measurement matrix in order to decrease the computational complexity; and rebinning of the projections to parallel rays in order to extend its application to fan beam and helical cone beam scans. The weight involved in the proposed weighted CS model, denoted by Error Adaptation Weight (EAW), is calculated based on the statistical characteristics of CT reconstruction and is a function of Poisson measurement noise and rebinning interpolation error. Simulation results show that low computational complexity of the proposed method made the fast recovery of the CT images possible and using EAW reduces the reconstruction error by one order of magnitude. Recovery of a high quality 512$\times$ 512 image was achieved in less than 20 sec on a desktop computer without numerical optimizations.
[ { "created": "Sat, 8 Feb 2014 00:18:46 GMT", "version": "v1" } ]
2014-02-11
[ [ "Hashemi", "SayedMasoud", "" ], [ "Beheshti", "Soosan", "" ], [ "Gill", "Patrick R.", "" ], [ "Paul", "Narinder S.", "" ], [ "Cobbold", "Richard S. C.", "" ] ]
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1402.1806
Stefan Ulmer
S. Ulmer, A. Mooser, K. Blaum, S. Braeuninger, K. Franke, H. Kracke, C. Leiteritz, Y. Matsuda, H. Nagahama, C. Ospelkaus, C. C. Rodegheri, W. Quint, G. Schneider, C. Smorra, S. Van Gorp, J. Walz, and Y. Yamazaki
The magnetic moments of the proton and the antiproton
null
null
10.1088/1742-6596/488/1/012033
null
physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent exciting progress in the preparation and manipulation of the motional quantum states of a single trapped proton enabled the first direct detection of the particle's spin state. Based on this success the proton magnetic moment $\mu_p$ was measured with ppm precision in a Penning trap with a superimposed magnetic field inhomogeneity. An improvement by an additional factor of 1000 in precision is possible by application of the so-called double Penning trap technique. In a recent paper we reported the first demonstration of this method with a single trapped proton, which is a major step towards the first direct high-precision measurement of $\mu_p$. The techniques required for the proton can be directly applied to measure the antiproton magnetic moment $\mu_{\bar{p}}$. An improvement in precision of $\mu_{\bar{p}}$ by more than three orders of magnitude becomes possible, which will provide one of the most sensitive tests of CPT invariance. To achieve this research goal we are currently setting up the Baryon Antibaryon Symmetry Experiment (BASE) at the antiproton decelerator (AD) of CERN.
[ { "created": "Sat, 8 Feb 2014 00:57:10 GMT", "version": "v1" } ]
2015-06-18
[ [ "Ulmer", "S.", "" ], [ "Mooser", "A.", "" ], [ "Blaum", "K.", "" ], [ "Braeuninger", "S.", "" ], [ "Franke", "K.", "" ], [ "Kracke", "H.", "" ], [ "Leiteritz", "C.", "" ], [ "Matsuda", "Y.", "" ], [ "Nagahama", "H.", "" ], [ "Ospelkaus", "C.", "" ], [ "Rodegheri", "C. C.", "" ], [ "Quint", "W.", "" ], [ "Schneider", "G.", "" ], [ "Smorra", "C.", "" ], [ "Van Gorp", "S.", "" ], [ "Walz", "J.", "" ], [ "Yamazaki", "Y.", "" ] ]
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1402.1807
Aubrey Jaffer
Aubrey Jaffer
Recurrence for Pandimensional Space-Filling Functions
19 pages, 20 figures
null
null
null
cs.CG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A space-filling function is a bijection from the unit line segment to the unit square, cube, or hypercube. The function from the unit line segment is continuous. The inverse function, while well-defined, is not continuous. Space-filling curves, the finite approximations to space-filling functions, have found application in global optimization, database indexing, and dimension reduction among others. For these applications the desired transforms are mapping a scalar to multidimensional coordinates and mapping multidimensional coordinates to a scalar. Presented are recurrences which produce space-filling functions and curves of any rank $d\ge2$ based on serpentine Hamiltonian paths on $({\bf Z}\bmod s)^d$ where $s\ge2$. The recurrences for inverse space-filling functions are also presented. Both Peano and Hilbert curves and functions and their generalizations to higher dimensions are produced by these recurrences. The computations of these space-filling functions and their inverse functions are absolutely convergent geometric series. The space-filling functions are constructed as limits of integer recurrences and equivalently as non-terminating real recurrences. Scaling relations are given which enable the space-filling functions and curves and their inverses to extend beyond the unit area or volume and even to all of $d$-space. This unification of pandimensional space-filling curves facilitates quantitative comparison of curves generated from different Hamiltonian paths. The isotropy and performance in dimension reduction of a variety of space-filling curves are analyzed. For dimension reduction it is found that Hilbert curves perform somewhat better than Peano curves and their isotropic variants.
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2015-04-21
[ [ "Jaffer", "Aubrey", "" ] ]
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1402.1810
Martin F\"urer
Martin F\"urer
A Natural Generalization of Bounded Tree-Width and Bounded Clique-Width
To appear in the proceedings of Latin 2014. Springer LNCS 8392
null
null
null
cs.DS cs.CC cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate a new width parameter, the fusion-width of a graph. It is a natural generalization of the tree-width, yet strong enough that not only graphs of bounded tree-width, but also graphs of bounded clique-width, trivially have bounded fusion-width. In particular, there is no exponential growth between tree-width and fusion-width, as is the case between tree-width and clique-width. The new parameter gives a good intuition about the relationship between tree-width and clique-width.
[ { "created": "Sat, 8 Feb 2014 01:55:12 GMT", "version": "v1" } ]
2014-02-11
[ [ "Fürer", "Martin", "" ] ]
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1402.1811
Martin F\"urer
Martin F\"urer
How Fast Can We Multiply Large Integers on an Actual Computer?
To appear in the proceedings of Latin 2014. Springer LNCS 8392
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null
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cs.CC cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We provide two complexity measures that can be used to measure the running time of algorithms to compute multiplications of long integers. The random access machine with unit or logarithmic cost is not adequate for measuring the complexity of a task like multiplication of long integers. The Turing machine is more useful here, but fails to take into account the multiplication instruction for short integers, which is available on physical computing devices. An interesting outcome is that the proposed refined complexity measures do not rank the well known multiplication algorithms the same way as the Turing machine model.
[ { "created": "Sat, 8 Feb 2014 02:47:25 GMT", "version": "v1" } ]
2014-02-11
[ [ "Fürer", "Martin", "" ] ]
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1402.1813
Robin Thomas
Luke Postle and Robin Thomas
Five-list-coloring graphs on surfaces I. Two lists of size two in planar graphs
8 pages, minor revision based on referee report
J. Combin. Theory Ser. B 111 (2015), 234-241
null
null
math.CO cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let G be a plane graph with outer cycle C, let u,v be vertices of C and let (L(x):x in V(G)) be a family of sets such that |L(u)|=|L(v)|=2, L(x) has at least three elements for every vertex x of C-{u,v} and L(x) has at least five elements for every vertex x of G-V(C). We prove a conjecture of Hutchinson that G has a (proper) coloring f such that f(x) belongs to L(x) for every vertex x of G. We will use this as a lemma in subsequent papers.
[ { "created": "Sat, 8 Feb 2014 03:21:34 GMT", "version": "v1" }, { "created": "Tue, 5 Aug 2014 21:01:18 GMT", "version": "v2" } ]
2017-03-28
[ [ "Postle", "Luke", "" ], [ "Thomas", "Robin", "" ] ]
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1402.1814
Paresh Tanna
Prof. Paresh Tanna, Dr. Yogesh Ghodasara
Foundation for Frequent Pattern Mining Algorithms Implementation
5 pages, Published with International Journal of Computer Trends and Technology (IJCTT)
International Journal of Computer Trends and Technology (IJCTT) 4(7):2159-2163, July 2013
10.14445/2231-2803
null
cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
As with the development of the IT technologies, the amount of accumulated data is also increasing. Thus the role of data mining comes into picture. Association rule mining becomes one of the significant responsibilities of descriptive technique which can be defined as discovering meaningful patterns from large collection of data. The frequent pattern mining algorithms determine the frequent patterns from a database. Mining frequent itemset is very fundamental part of association rule mining. Many algorithms have been proposed from last many decades including majors are Apriori, Direct Hashing and Pruning, FP-Growth, ECLAT etc. The aim of this study is to analyze the existing techniques for mining frequent patterns and evaluate the performance of them by comparing Apriori and DHP algorithms in terms of candidate generation, database and transaction pruning. This creates a foundation to develop newer algorithm for frequent pattern mining.
[ { "created": "Sat, 8 Feb 2014 03:25:57 GMT", "version": "v1" } ]
2014-02-11
[ [ "Tanna", "Prof. Paresh", "" ], [ "Ghodasara", "Dr. Yogesh", "" ] ]
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1402.1815
Songnam Hong Dr.
Song-Nam Hong and Giuseppe Caire
On the Performance of Optimized Dense Device-to-Device Wireless Networks
Revised and resubmitted to IEEE Transactions on Information Theory
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a D2D wireless network where $n$ users are densely deployed in a squared planar region and communicate with each other without the help of a wired infrastructure. For this network, we examine the 3-phase hierarchical cooperation (HC) scheme and the 2-phase improved HC scheme based on the concept of {\em network multiple access}. Exploiting recent results on the optimality of treating interference as noise in Gaussian interference channels, we optimize the achievable average per-link rate and not just its scaling law. In addition, we provide further improvements on both the previously proposed hierarchical cooperation schemes by a more efficient use of TDMA and spatial reuse. Thanks to our explicit achievable rate expressions, we can compare HC scheme with multihop routing (MR), where the latter can be regarded as the current practice of D2D wireless networks. Our results show that the improved and optimized HC schemes yield very significant rate gains over MR in realistic conditions of channel propagation exponents, signal to noise ratio, and number of users. This sheds light on the long-standing question about the real advantage of HC scheme over MR beyond the well-known scaling laws analysis. In contrast, we also show that our rate optimization is non-trivial, since when HC is applied with off-the-shelf choice of the system parameters, no significant rate gain with respect to MR is achieved. We also show that for large pathloss exponent the sum rate is a nearly linear function of the number of users $n$ in the range of networks of practical size. This also sheds light on a long-standing dispute on the effective achievability of linear sum rate scaling with HC. Finally, we notice that the achievable sum rate for large $\alpha$ is much larger than for small $\alpha$. This suggests that HC scheme may be a very effective approach for networks operating at mm-waves.
[ { "created": "Sat, 8 Feb 2014 03:35:09 GMT", "version": "v1" }, { "created": "Fri, 19 Jun 2015 14:28:34 GMT", "version": "v2" } ]
2015-06-22
[ [ "Hong", "Song-Nam", "" ], [ "Caire", "Giuseppe", "" ] ]
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1402.1819
Sahaya Rose Vigita
Sahaya Rose Vigita, Golden Julie
Reliable Link-Based Routing Protocol for Highly Dynamic Mobile Adhoc Networks
7 pages, 8 figures, Published with International Journal of Engineering Trends and Technology (IJETT)
International Journal of Engineering Trends and Technology (IJETT)-Volume 4 Issue 5/ May 2013, Pages 1636 - 1642
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Traditional topology-based MANET routing protocols use stateful routing which increases the processing,communication and memory overheads. The high mobility of nodes in MANETs makes it difficult to maintain a deterministic route. To overcome this, stateless geographic routing protocols which ensure reliable data delivery have been proposed. It is found that link instability can be a major factor for unreliable data delivery. Driven by this issue, Link and Position based Opportunistic Routing (L-POR) protocol which chooses a forwarder based on the reception power of a node has been proposed. A back-up scheme is also proposed to handle communication holes. Simulation results show that the proposed protocol achieves excellent performance even under high node mobility.
[ { "created": "Sat, 8 Feb 2014 04:31:18 GMT", "version": "v1" } ]
2014-02-11
[ [ "Vigita", "Sahaya Rose", "" ], [ "Julie", "Golden", "" ] ]
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1402.1834
Alejandro Frery
Alejandro C. Frery and Eliana S. de Almeida and Osvaldo A. Rosso
The Generalized Statistical Complexity of PolSAR Data
Proceedings of The 4th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR), 2013, 100-103
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents and discusses the use of a new feature for PolSAR imagery: the Generalized Statistical Complexity. This measure is able to capture the disorder of the data by means of the entropy, as well as its departure from a reference distribution. The latter component is obtained by measuring a stochastic distance between two models: the $\mathcal G^0$ and the Gamma laws. Preliminary results on the intensity components of AIRSAR image of San Francisco are encouraging.
[ { "created": "Sat, 8 Feb 2014 08:38:17 GMT", "version": "v1" } ]
2014-02-11
[ [ "Frery", "Alejandro C.", "" ], [ "de Almeida", "Eliana S.", "" ], [ "Rosso", "Osvaldo A.", "" ] ]
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1402.1841
Nikhita Reddy Gade
G.Nikhita Reddy, G.J.Ugander Reddy
Study of Cloud Computing in HealthCare Industry
4 pages
International Journal of Science and Engineering Research - France - ISSN : 2229-5518 Volume 4 Issue 9 - September 2013 Pages: 68-71
null
null
cs.CY cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In Todays real world technology has become a domiant crucial component in every industry including healthcare industry. The benefits of storing electronically the records of patients have increased the productivity of patient care and easy accessibility and usage. The recent technological innovations in the health care is the invention of cloud based Technology. But many fears and security measures regarding patient records storing remotely is a concern for many in health care industry. One needs to understand the benefits and fears of implementation of cloud computing its advantages and disadvantages of this new technology.
[ { "created": "Sat, 8 Feb 2014 11:51:13 GMT", "version": "v1" } ]
2014-02-11
[ [ "Reddy", "G. Nikhita", "" ], [ "Reddy", "G. J. Ugander", "" ] ]
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1402.1842
Nikhita Reddy Gade
G. Nikhita Reddy, G.J. Ugander Reddy
A Study Of Cyber Security Challenges And Its Emerging Trends On Latest Technologies
5 pages
International Journal of Engineering and Technology - UK ISSN: 2049-3444, Volume 4 No.1 January 2014
null
null
cs.CR cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cyber Security plays an important role in the field of information technology .Securing the information have become one of the biggest challenges in the present day. When ever we think about the cyber security the first thing that comes to our mind is cyber crimes which are increasing immensely day by day. Various Governments and companies are taking many measures in order to prevent these cyber crimes. Besides various measures cyber security is still a very big concern to many. This paper mainly focuses on challenges faced by cyber security on the latest technologies .It also focuses on latest about the cyber security techniques, ethics and the trends changing the face of cyber security.
[ { "created": "Sat, 8 Feb 2014 12:00:10 GMT", "version": "v1" } ]
2014-02-11
[ [ "Reddy", "G. Nikhita", "" ], [ "Reddy", "G. J. Ugander", "" ] ]
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1402.1843
Manuel Fiolhais
J. G\"u\'emez and M. Fiolhais
Forces on wheels and fuel consumption in cars
10 pages, 1 figure
Eur. J. Phys. {\bf 34} 1005-1013 (2013)
10.1088/0143-0807/34/4/1005
null
physics.ed-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Motivated by real classroom discussions, we analyse the forces acting on moving vehicles, specifically friction forces on the wheels. In usual cars, with front-wheel drive, when the car accelerates these forces are in the forward direction in the front wheels, but they are in the opposite direction in the rear wheels. The situation may be intriguing for students, but it may also be helpful and stimulating to clarify the role of friction forces on rolling objects. In this article we also study thermodynamical aspects of an accelerating car, relating the distance traveled with the amount of fuel consumed. The fuel consumption is explicitly shown to be Galilean invariant and we identify the Gibbs free energy as the relevant quantity that enters in the thermodynamical description of the accelerating car. The more realistic case of the car's motion taking into account the dragging forces is also discussed.
[ { "created": "Sat, 8 Feb 2014 12:03:41 GMT", "version": "v1" } ]
2014-02-11
[ [ "Güémez", "J.", "" ], [ "Fiolhais", "M.", "" ] ]
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1402.1847
Jae Won Shin
Jae Won Shin, Sang-In Bak, Doyoon Kim, Chong Yeal Kim and Seung-Woo Hong
GEANT4 and PHITS simulations of the shielding of neutrons from $^{252}$Cf source
null
J. Korean Phys. Soc. 65, 591-598 (2014)
10.3938/jkps.65.591
null
physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Neutron shielding simulations by using GEANT4 and PHITS code are performed. As a neutron source, $^{252}$Cf is considered and the energy distribution of the neutrons emitted from $^{252}$Cf is assumed the Watt fission spectrum. The neutron dose equivalent rates with and without the shield are estimated for shielding materials such as graphite, iron, polyethylene, NS-4-FR and KRAFTON-HB. For the neutron shielding simulations by using GEANT4, high precision (G4HP) model with G4NDL 4.2 based on ENDF-VII data are used. And for PHITS simulations, JENDL-4.0 library are used for the same purpose. It is found that differences between the shielding calculations by using GEANT4 with G4NDL 4.2 and PHITS with JENDL-4.0 library are not significant for all cases considered in this work. We investigate the accuracy of the neutron dose equivalent rates obtained from GEANT4 and PHITS by comparing our simulation results with experimental data and other values calculated earlier. Calculated neutron dose equivalent rates agree well with the experimental dose equivalent rates within 20% errors except for polyethylene. For polyethylene material, discrepancy between the calculations and the experiments are up to 40% but all simulations show consistent features.
[ { "created": "Sat, 8 Feb 2014 12:25:12 GMT", "version": "v1" }, { "created": "Wed, 26 Mar 2014 02:38:30 GMT", "version": "v2" } ]
2014-09-24
[ [ "Shin", "Jae Won", "" ], [ "Bak", "Sang-In", "" ], [ "Kim", "Doyoon", "" ], [ "Kim", "Chong Yeal", "" ], [ "Hong", "Seung-Woo", "" ] ]
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1402.1857
Manuel Fiolhais
Julio G\"u\'emez and Manuel Fiolhais
A 4-vector formalism for classical mechanics
23 pages, 2 figures
Revista Brasileira de Ensino da F\'isica, 35 (2013) 4310 (13pp)
null
null
physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a matrix formalism, inspired by the Minkowski four-vectors of special relativity, useful to solve classical physics problems related to both mechanics and thermodynamics. The formalism turns out to be convenient to deal with exercises involving non-conservative forces and production or destruction of mechanical energy. On the other hand, it provides a framework to treat straightforwardly changes of inertial reference frames, since it embodies the Principle of Relativity. We apply the formalism to a few cases to better show how it works.
[ { "created": "Sat, 8 Feb 2014 15:22:30 GMT", "version": "v1" } ]
2014-02-11
[ [ "Güémez", "Julio", "" ], [ "Fiolhais", "Manuel", "" ] ]
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1402.1862
Tao Yang
Tao Yang, Ziyang Meng, Dimos V. Dimarogonas, and Karl H. Johansson
Periodic Behaviors in Constrained Multi-agent Systems
15 pages, 7 figures
null
null
null
cs.SY cs.MA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we provide two discrete-time multi-agent models which generate periodic behaviors. The first one is a multi-agent system of identical double integrators with input saturation constraints, while the other one is a multi-agent system of identical neutrally stable system with input saturation constraints. In each case, we show that if the feedback gain parameters of the local controller satisfy a certain condition, the multi-agent system exhibits a periodic solution.
[ { "created": "Sat, 8 Feb 2014 16:28:33 GMT", "version": "v1" } ]
2014-02-12
[ [ "Yang", "Tao", "" ], [ "Meng", "Ziyang", "" ], [ "Dimarogonas", "Dimos V.", "" ], [ "Johansson", "Karl H.", "" ] ]
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1402.1864
Massimiliano Pontil
Andreas Maurer, Massimiliano Pontil, Bernardino Romera-Paredes
An Inequality with Applications to Structured Sparsity and Multitask Dictionary Learning
null
null
null
null
cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
From concentration inequalities for the suprema of Gaussian or Rademacher processes an inequality is derived. It is applied to sharpen existing and to derive novel bounds on the empirical Rademacher complexities of unit balls in various norms appearing in the context of structured sparsity and multitask dictionary learning or matrix factorization. A key role is played by the largest eigenvalue of the data covariance matrix.
[ { "created": "Sat, 8 Feb 2014 16:39:30 GMT", "version": "v1" }, { "created": "Sat, 7 Jun 2014 07:37:52 GMT", "version": "v2" } ]
2014-06-10
[ [ "Maurer", "Andreas", "" ], [ "Pontil", "Massimiliano", "" ], [ "Romera-Paredes", "Bernardino", "" ] ]
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1402.1865
Keisuke Hakuta
Keisuke Hakuta, Hisayoshi Sato, and Tsuyoshi Takagi
Some properties of ${\tau}$-adic expansions on hyperelliptic Koblitz curves
100 pages
null
null
null
math.NT cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper explores two techniques on a family of hyperelliptic curves that have been proposed to accelerate computation of scalar multiplication for hyperelliptic curve cryptosystems. In elliptic curve cryptosystems, it is known that Koblitz curves admit fast scalar multiplication, namely, the ${\tau}$-adic non-adjacent form ($\tau$-NAF). It is shown that the $\tau$-NAF has the three properties: (1) existence, (2) uniqueness, and (3) minimality of the Hamming weight. These properties are not only of intrinsic mathematical interest, but also desirable in some cryptographic applications. On the other hand, G{\"u}nther, Lange, and Stein have proposed two generalizations of $\tau$-NAF for a family of hyperelliptic curves, called \emph{hyperelliptic Koblitz curves}. However, to our knowledge, it is not known whether the three properties are true or not. We provide an answer to the question. Our investigation shows that the first one has only the existence and the second one has the existence and uniqueness. Furthermore, we shall prove that there exist 16 digit sets so that one can achieve the second one.
[ { "created": "Sat, 8 Feb 2014 16:41:07 GMT", "version": "v1" } ]
2014-02-11
[ [ "Hakuta", "Keisuke", "" ], [ "Sato", "Hisayoshi", "" ], [ "Takagi", "Tsuyoshi", "" ] ]
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1402.1867
Thomas Juffmann
Thomas Juffmann, Adriana Milic, Michael M\"ullneritsch, Peter Asenbaum, Alexander Tsukernik, Jens T\"uxen, Marcel Mayor, Ori Cheshnovsky and Markus Arndt
Real-time single-molecule imaging of quantum interference
Related video: http://www.youtube.com/watch?v=wDx8tu-iX8U
Nature Nanotechnology 7, 297-300 (2012)
10.1038/nnano.2012.34
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The observation of interference patterns in double-slit experiments with massive particles is generally regarded as the ultimate demonstration of the quantum nature of these objects. Such matter-wave interference has been observed for electrons, neutrons, atoms and molecules and it differs from classical wave-physics in that it can even be observed when single particles arrive at the detector one by one. The build-up of such patterns in experiments with electrons has been described as the "most beautiful experiment in physics". Here we show how a combination of nanofabrication and nanoimaging methods allows us to record the full two-dimensional build-up of quantum diffraction patterns in real-time for phthalocyanine molecules PcH2 and their tailored derivatives F24PcH2 with a mass of 1298 amu. A laser-controlled micro-evaporation source was used to produce a beam of molecules with the required intensity and coherence and the gratings were machined in 10 nm thick silicon nitride membranes to reduce the effect of van der Waals forces. Wide-field fluorescence microscopy was used to detect the position of each molecule with an accuracy of 10 nm and to reveal the build-up of a deterministic ensemble interference pattern from stochastically arriving and internally hot single molecules.
[ { "created": "Sat, 8 Feb 2014 16:59:19 GMT", "version": "v1" } ]
2014-02-11
[ [ "Juffmann", "Thomas", "" ], [ "Milic", "Adriana", "" ], [ "Müllneritsch", "Michael", "" ], [ "Asenbaum", "Peter", "" ], [ "Tsukernik", "Alexander", "" ], [ "Tüxen", "Jens", "" ], [ "Mayor", "Marcel", "" ], [ "Cheshnovsky", "Ori", "" ], [ "Arndt", "Markus", "" ] ]
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1402.1869
KyungHyun Cho
Guido Mont\'ufar, Razvan Pascanu, Kyunghyun Cho and Yoshua Bengio
On the Number of Linear Regions of Deep Neural Networks
null
null
null
null
stat.ML cs.LG cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the complexity of functions computable by deep feedforward neural networks with piecewise linear activations in terms of the symmetries and the number of linear regions that they have. Deep networks are able to sequentially map portions of each layer's input-space to the same output. In this way, deep models compute functions that react equally to complicated patterns of different inputs. The compositional structure of these functions enables them to re-use pieces of computation exponentially often in terms of the network's depth. This paper investigates the complexity of such compositional maps and contributes new theoretical results regarding the advantage of depth for neural networks with piecewise linear activation functions. In particular, our analysis is not specific to a single family of models, and as an example, we employ it for rectifier and maxout networks. We improve complexity bounds from pre-existing work and investigate the behavior of units in higher layers.
[ { "created": "Sat, 8 Feb 2014 17:16:27 GMT", "version": "v1" }, { "created": "Sat, 7 Jun 2014 19:56:14 GMT", "version": "v2" } ]
2014-06-10
[ [ "Montúfar", "Guido", "" ], [ "Pascanu", "Razvan", "" ], [ "Cho", "Kyunghyun", "" ], [ "Bengio", "Yoshua", "" ] ]
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1402.1870
Sk Md Abu Nayeem
Nilanjan De, Sk. Md. Abu Nayeem and Anita Pal
Bounds for the modified eccentric connectivity index
10 pages
Advanced Modeling and Optimization, 16(1) (2014), pp. 133 - 142
null
null
math.CO cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The modified eccentric connectivity index of a graph is defined as the sum of the products of eccentricity with the total degree of neighboring vertices, over all vertices of the graph. This is a generalization of eccentric connectivity index. In this paper, we derive some upper and lower bounds for the modified eccentric connectivity index in terms of some graph parameters such as number of vertices, number of edges, radius, minimum degree, maximum degree, total eccentricity, the first and second Zagreb indices, Weiner index etc.
[ { "created": "Sat, 8 Feb 2014 17:25:59 GMT", "version": "v1" } ]
2014-06-03
[ [ "De", "Nilanjan", "" ], [ "Nayeem", "Sk. Md. Abu", "" ], [ "Pal", "Anita", "" ] ]
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1402.1879
Allen Yang
Liansheng Zhuang, Tsung-Han Chan, Allen Y. Yang, S. Shankar Sastry, Yi Ma
Sparse Illumination Learning and Transfer for Single-Sample Face Recognition with Image Corruption and Misalignment
null
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Single-sample face recognition is one of the most challenging problems in face recognition. We propose a novel algorithm to address this problem based on a sparse representation based classification (SRC) framework. The new algorithm is robust to image misalignment and pixel corruption, and is able to reduce required gallery images to one sample per class. To compensate for the missing illumination information traditionally provided by multiple gallery images, a sparse illumination learning and transfer (SILT) technique is introduced. The illumination in SILT is learned by fitting illumination examples of auxiliary face images from one or more additional subjects with a sparsely-used illumination dictionary. By enforcing a sparse representation of the query image in the illumination dictionary, the SILT can effectively recover and transfer the illumination and pose information from the alignment stage to the recognition stage. Our extensive experiments have demonstrated that the new algorithms significantly outperform the state of the art in the single-sample regime and with less restrictions. In particular, the single-sample face alignment accuracy is comparable to that of the well-known Deformable SRC algorithm using multiple gallery images per class. Furthermore, the face recognition accuracy exceeds those of the SRC and Extended SRC algorithms using hand labeled alignment initialization.
[ { "created": "Sat, 8 Feb 2014 18:46:28 GMT", "version": "v1" } ]
2014-02-11
[ [ "Zhuang", "Liansheng", "" ], [ "Chan", "Tsung-Han", "" ], [ "Yang", "Allen Y.", "" ], [ "Sastry", "S. Shankar", "" ], [ "Ma", "Yi", "" ] ]
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1402.1880
Ayad Ghany Ismaeel
Ayad Ghany Ismaeel, Dina Y. Mikhail
Design of Locally E-management System for Technical Education Foundation- Erbil
11 pages, 11 figures, 1 tables
PolyTechnic, Vol. 1, No. 1, Oct. 2011, National Journal, Erbil-IRAQ
null
null
cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Until now, there is no e-management and automation necessary for the operations or procedures of the departments in the Technical Education Foundation Erbil, and the foundation like any other organization in Kurdistan region is not connected to the network, because there is not infrastructure for that purpose. To solve this problem, comes the proposal DLMS4TEF, which requirements are divided into hardware and software, as hardware will need Fast-Ethernet (LAN) technology to connect the departments of the Foundation via Client-Server network later, when an infrastructure is established for e-governments or e-management, it may be extended to the campus network. The software is represented by installing windows server to implement the proposal design of DLMS4TEF, PHP script is used as web programming that supports the server, where as the HTML and JavaScript are used to support the client side. The dynamic DLMS4TEF will be based on relational database, which is created by using MySQL, to support processing hundreds of queries per second, and the Kurdish Unicode to support Kurdish fonts of GUI's, Moreover, for security DLMS4TEF allows each department in the Foundation to enter its own section and prevent accessing other sections by using HTAccessible program which allows the user to access by using his IP address and his computer only. The important conclusions and advantages of applying DLMS4TEF are making backup to DLMS4TEF's databases using the option (zipped) which allows them to reach the size of (3%) of the original database size, sufficient security techniques, through achieving levels of security, hidden access to the administrator section, and finally DLMS4TEF, when compared with the traditional methods and project of Oman, shows the same efficiency of some, if not better, features of Oman. Keywords- E-management, Client-Server network, Fast-Ethernet, PHP, MySQL
[ { "created": "Sat, 8 Feb 2014 19:29:33 GMT", "version": "v1" } ]
2014-02-12
[ [ "Ismaeel", "Ayad Ghany", "" ], [ "Mikhail", "Dina Y.", "" ] ]
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1402.1881
Bo Chen
Shuyu Zhou, Xiandong Zhang, Bo Chen, Steef van de Velde
Tactical Fixed Job Scheduling with Spread-Time Constraints
null
null
null
null
cs.DS cs.CE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We address the tactical fixed job scheduling problem with spread-time constraints. In such a problem, there are a fixed number of classes of machines and a fixed number of groups of jobs. Jobs of the same group can only be processed by machines of a given set of classes. All jobs have their fixed start and end times. Each machine is associated with a cost according to its machine class. Machines have spread-time constraints, with which each machine is only available for $L$ consecutive time units from the start time of the earliest job assigned to it. The objective is to minimize the total cost of the machines used to process all the jobs. For this strongly NP-hard problem, we develop a branch-and-price algorithm, which solves instances with up to $300$ jobs, as compared with CPLEX, which cannot solve instances of $100$ jobs. We further investigate the influence of machine flexibility by computational experiments. Our results show that limited machine flexibility is sufficient in most situations.
[ { "created": "Sat, 8 Feb 2014 19:30:16 GMT", "version": "v1" } ]
2014-02-12
[ [ "Zhou", "Shuyu", "" ], [ "Zhang", "Xiandong", "" ], [ "Chen", "Bo", "" ], [ "van de Velde", "Steef", "" ] ]
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1402.1882
Hong Huang
Hong Huang, Hajar Barani, and Hussein Al-Azzawi
Network Multiple-Input and Multiple-Output for Wireless Local Area Networks
This paper has been withdraw by the authors due to a crucial error in algorithm 1
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cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a tutorial for network multiple-input and multiple-output (netMIMO) in wireless local area networks (WLAN). Wireless traffic demand is growing exponentially. NetMIMO allows access points (APs) in a WLAN to cooperate in their transmissions as if the APs form a single virtual MIMO node. NetMIMO can significantly increase network capacity by reducing interferences and contentions through the cooperation of the APs. This paper covers a few representative netMIMO methods, ranging from interference alignment and cancelation, channel access protocol to allow MIMO nodes to join ongoing transmissions, distributed synchronization, to interference and contention mitigation in multiple contention domains. We believe the netMIMO methods described here are just the beginning of the new technologies to address the challenge of ever-increasing wireless traffic demand, and the future will see even more new developments in this field.
[ { "created": "Sat, 8 Feb 2014 19:35:51 GMT", "version": "v1" }, { "created": "Mon, 5 May 2014 19:31:39 GMT", "version": "v2" } ]
2014-05-06
[ [ "Huang", "Hong", "" ], [ "Barani", "Hajar", "" ], [ "Al-Azzawi", "Hussein", "" ] ]
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1402.1885
Emanuele Tassi
Emanuele Tassi
Hamiltonian closures for two-moment fluid models derived from drift-kinetic equations
null
null
10.1088/1751-8113/47/19/195501
null
physics.plasm-ph math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We derive the conditions under which the fluid models obtained from the first two moments of Hamiltonian drift-kinetic systems of interest to plasma physics, preserve a Hamiltonian structure. The adopted procedure consists of determining closure relations that allow to truncate the Poisson bracket of the drift-kinetic system, expressed in terms of the moments, in such a way that the resulting operation is a Poisson bracket for functionals of the first two fluid moments. The analysis is carried out for a class of full drift-kinetic equations and also for drift-kinetic systems in which a splitting between an equilibrium distribution function and a perturbation is performed. In the former case we obtain that the only closure, not involving integral or differential operators, that leads to a Poisson bracket, corresponds to that of an ideal adiabatic gas made of molecules possessing one degree of freedom. In the latter case, Hamiltonian closures turn out to be those in which the second moment is a linear combination of the first two moments, which can be seen as a linearization of the Hamiltonian closure of the full drift-kinetic case. A number of weakly-3D Hamiltonian reduced fluid models of interest, for instance for tokamak plasmas, can be derived in this way and, viceversa given a fluid model with a Hamiltonian structure of a certain type, a parent Hamiltonian drift-kinetic model can then be identified. We make use of this correspondence to identify the drift-kinetic models from which Hamiltonian fluid models for magnetic reconnection and compressible plasma dynamics in the presence of a static but inhomogeneous magnetic field can be derived. The Casimir invariants of the Poisson brackets of the derived fluid models are also discussed.
[ { "created": "Sat, 8 Feb 2014 20:10:20 GMT", "version": "v1" }, { "created": "Tue, 25 Mar 2014 19:09:35 GMT", "version": "v2" } ]
2015-06-18
[ [ "Tassi", "Emanuele", "" ] ]
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1402.1889
Xueye Hu
Xueye Hu, Hucheng Chen, Kai Chen, Joseph Mead, Shubin Liu, Qi An
Development of COTS ADC SEE Test System for the ATLAS LAr Calorimeter Upgrade
8 pages, 14 figures
null
null
null
physics.ins-det hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Radiation-tolerant, high speed, high density and low power commercial off-the-shelf (COTS) analog-to-digital converters (ADCs) are planned to be used in the upgrade to the Liquid Argon (LAr) calorimeter front end (FE) trigger readout electronics. Total ionization dose (TID) and single event effect (SEE) are two important radiation effects which need to be characterized on COTS ADCs. In our initial TID test, Texas Instruments (TI) ADS5272 was identified to be the top performer after screening a total 17 COTS ADCs from different manufacturers with dynamic range and sampling rate meeting the requirements of the FE electronics. Another interesting feature of ADS5272 is its 6.5 clock cycles latency, which is the shortest among the 17 candidates. Based on the TID performance, we have designed a SEE evaluation system for ADS5272, which allows us to further assess its radiation tolerance. In this paper, we present a detailed design of ADS5272 SEE evaluation system and show the effectiveness of this system while evaluating ADS5272 SEE characteristics in multiple irradiation tests. According to TID and SEE test results, ADS5272 was chosen to be implemented in the full-size LAr Trigger Digitizer Board (LTDB) demonstrator, which will be installed on ATLAS calorimeter during the 2014 Long Shutdown 1 (LS1).
[ { "created": "Sat, 8 Feb 2014 20:55:38 GMT", "version": "v1" }, { "created": "Tue, 11 Feb 2014 17:35:26 GMT", "version": "v2" }, { "created": "Thu, 6 Mar 2014 16:20:36 GMT", "version": "v3" } ]
2014-03-07
[ [ "Hu", "Xueye", "" ], [ "Chen", "Hucheng", "" ], [ "Chen", "Kai", "" ], [ "Mead", "Joseph", "" ], [ "Liu", "Shubin", "" ], [ "An", "Qi", "" ] ]
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1402.1892
Zachary Lipton
Zachary Chase Lipton, Charles Elkan, Balakrishnan Narayanaswamy
Thresholding Classifiers to Maximize F1 Score
null
null
null
null
stat.ML cs.IR cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper provides new insight into maximizing F1 scores in the context of binary classification and also in the context of multilabel classification. The harmonic mean of precision and recall, F1 score is widely used to measure the success of a binary classifier when one class is rare. Micro average, macro average, and per instance average F1 scores are used in multilabel classification. For any classifier that produces a real-valued output, we derive the relationship between the best achievable F1 score and the decision-making threshold that achieves this optimum. As a special case, if the classifier outputs are well-calibrated conditional probabilities, then the optimal threshold is half the optimal F1 score. As another special case, if the classifier is completely uninformative, then the optimal behavior is to classify all examples as positive. Since the actual prevalence of positive examples typically is low, this behavior can be considered undesirable. As a case study, we discuss the results, which can be surprising, of applying this procedure when predicting 26,853 labels for Medline documents.
[ { "created": "Sat, 8 Feb 2014 21:14:29 GMT", "version": "v1" }, { "created": "Wed, 14 May 2014 01:29:47 GMT", "version": "v2" } ]
2014-05-15
[ [ "Lipton", "Zachary Chase", "" ], [ "Elkan", "Charles", "" ], [ "Narayanaswamy", "Balakrishnan", "" ] ]
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Thresholding Classifiers to Maximize F1 Score
http://arxiv.org/abs/1402.1892v2
http://arxiv.org/pdf/1402.1892v2.pdf
https://github.com/Raghuvar/pneumonia_detection_using_X-rays
false
false
https://paperswithcode.com/paper/thresholding-classifiers-to-maximize-f1-score
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1402.1896
Jingjin Yu
Jingjin Yu, Mac Schwager, Daniela Rus
Correlated Orienteering Problem and it Application to Persistent Monitoring Tasks
Extended version, 18 pages
null
null
null
cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a novel non-linear extension to the Orienteering Problem (OP), called the Correlated Orienteering Problem (COP). We use COP to model the planning of informative tours for the persistent monitoring of a spatiotemporal field with time-invariant spatial correlations, in which the tours are constrained to have limited length. Our focus in this paper is QCOP a quadratic COP formulation that only looks at correlations between neighboring nodes in a node network. The main feature of QCOP is a quadratic utility function capturing the said spatial correlation. QCOP may be solved using mixed integer quadratic programming (MIQP), with the resulting anytime algorithm capable of planning multiple disjoint tours that maximize the quadratic utility. In particular, our algorithm can quickly plan a near-optimal tour over a network with up to $150$ nodes. Besides performing extensive simulation studies to verify the algorithm's correctness and characterize its performance, we also successfully applied it to two realistic persistent monitoring tasks: (i) estimation over a synthetic spatiotemporal field, and (ii) estimating the temperature distribution in the state of Massachusetts.
[ { "created": "Sat, 8 Feb 2014 22:56:50 GMT", "version": "v1" }, { "created": "Mon, 15 Dec 2014 03:21:47 GMT", "version": "v2" } ]
2014-12-16
[ [ "Yu", "Jingjin", "" ], [ "Schwager", "Mac", "" ], [ "Rus", "Daniela", "" ] ]
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