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1401.4317
Chang-Yong Lee
Chang-Yong Lee and Dongju Lee
An efficient method for solving a correlated multi-item inventory system
13 pages and 4 figures
null
null
null
physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose an efficient method of finding an optimal solution for a multi-item continuous review inventory model in which a bivariate Gaussian probability distribution represents a correlation between the demands of different items. By utilizing appropriate normalizations of the demands, we show that the normalized demands are uncorrelated. Furthermore, the set of equations coupled with different items can be decoupled in such a way that the order quantity and reorder point for each item can be evaluated independently from those of the other. As a result, in contrast to conventional methods, the solution procedure for the proposed method can be much simpler and more accurate without any approximation. To demonstrate the advantage of the proposed method, we present a solution scheme for a multi-item continuous review inventory model in which the demand of optional components depend on that of a "vanilla box", representing the customer's stochastic demand, under stochastic payment and budget constraints. We also perform a sensitivity analysis to investigate the dependence of order quantities and reorder points on the correlation coefficient.
[ { "created": "Fri, 17 Jan 2014 12:13:30 GMT", "version": "v1" } ]
2014-01-20
[ [ "Lee", "Chang-Yong", "" ], [ "Lee", "Dongju", "" ] ]
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1401.4318
Gabriela Barrreto Lemos
Gabriela B. Lemos, Victoria Borish, Garrett D. Cole, Sven Ramelow, Radek Lapkiewicz and Anton Zeilinger
Quantum Imaging with Undetected Photons
Comments welcome
Nature 512, 409 (2014)
10.1038/nature13586
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Indistinguishable quantum states interfere, but the mere possibility of obtaining information that could distinguish between overlapping states inhibits quantum interference. Quantum interference imaging can outperform classical imaging or even have entirely new features. Here, we introduce and experimentally demonstrate a quantum imaging concept that relies on the indistinguishability of the possible sources of a photon that remains undetected. Our experiment uses pair creation in two separate down-conversion crystals. While the photons passing through the object are never detected, we obtain images exclusively with the sister photons that do not interact with the object. Therefore the object to be imaged can be either opaque or invisible to the detected photons. Moreover, our technique allows the probe wavelength to be chosen in a range for which suitable sources and/or detectors are unavailable. Our experiment is a prototype in quantum information where knowledge can be extracted by and about a photon that is never detected.
[ { "created": "Fri, 17 Jan 2014 12:19:16 GMT", "version": "v1" }, { "created": "Mon, 27 Jan 2014 18:21:46 GMT", "version": "v2" } ]
2014-09-23
[ [ "Lemos", "Gabriela B.", "" ], [ "Borish", "Victoria", "" ], [ "Cole", "Garrett D.", "" ], [ "Ramelow", "Sven", "" ], [ "Lapkiewicz", "Radek", "" ], [ "Zeilinger", "Anton", "" ] ]
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1401.4321
Rodrigo Costas
Rodrigo Costas, Zohreh Zahedi, Paul Wouters
Do altmetrics correlate with citations? Extensive comparison of altmetric indicators with citations from a multidisciplinary perspective
null
null
10.1002/asi.23309
null
cs.DL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An extensive analysis of the presence of different altmetric indicators provided by Altmetric.com across scientific fields is presented, particularly focusing on their relationship with citations. Our results confirm that the presence and density of social media altmetric counts are still very low and not very frequent among scientific publications, with 15%-24% of the publications presenting some altmetric activity and concentrating in the most recent publications, although their presence is increasing over time. Publications from the social sciences, humanities and the medical and life sciences show the highest presence of altmetrics, indicating their potential value and interest for these fields. The analysis of the relationships between altmetrics and citations confirms previous claims of positive correlations but relatively weak, thus supporting the idea that altmetrics do not reflect the same concept of impact as citations. Also, altmetric counts do not always present a better filtering of highly cited publications than journal citation scores. Altmetrics scores (particularly mentions in blogs) are able to identify highly cited publications with higher levels of precision than journal citation scores (JCS), but they have a lower level of recall. The value of altmetrics as a complementary tool of citation analysis is highlighted, although more research is suggested to disentangle the potential meaning and value of altmetric indicators for research evaluation.
[ { "created": "Fri, 17 Jan 2014 12:35:08 GMT", "version": "v1" } ]
2014-08-04
[ [ "Costas", "Rodrigo", "" ], [ "Zahedi", "Zohreh", "" ], [ "Wouters", "Paul", "" ] ]
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1401.4324
Frantisek Slanina
Frantisek Slanina
Dynamical phase transitions in Hegselmann-Krause model of opinion dynamics and consensus
null
Eur. Phys. J. B 79, 99-106 (2011)
10.1140/epjb/e2010-10568-y
null
physics.soc-ph cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The dynamics of the model of agents with limited confidence introduced by Hegselmann and Krause exhibits multiple well-separated regimes characterised by the number of distinct clusters in the stationary state. We present indications that there are genuine dynamical phase transitions between these regimes. The main indicator is the divergence of the average evolution time required to reach the stationary state. The slowdown close to the transition is connected with the emergence of the groups of mediator agents which are very small but have decisive role in the process of social convergence. More detailed study shows that the histogram of the evolution times is composed of several peaks. These peaks are unambiguously interpreted as corresponding to mediator groups consisting of one, two, three etc. agents. Detailed study reveals that each transition possesses also an internal fine structure.
[ { "created": "Fri, 17 Jan 2014 12:43:19 GMT", "version": "v1" } ]
2014-01-20
[ [ "Slanina", "Frantisek", "" ] ]
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1401.4325
Dmytro Kundys
D. O. Kundys, P. Murzyn, J.P. R. Wells, A. I. Tartakovskii, and M. S. Skolnick, Le Si Dang, E. V. Lutsenko and N. P. Tarasuk, O. G. Lyublinskaya, A. A. Toropov, and S. V. Ivanov
The dynamics of amplified spontaneous emission in CdSe/ZnSe quantum dots
null
Journal of Applied Physics 100, 123510 (2006)
10.1063/1.2402793
null
cond-mat.mtrl-sci physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have used the variable stripe technique and pump-probe spectroscopy to investigate both gain and the dynamics of amplified spontaneous emission from CdSe quantum dot structures. We have found modal gain coefficients of 75 and 32 1/cm for asymmetric and symmetric waveguide structures, respectively. Amplified spontaneous emission decay times of 150 and 300 ps and carrier capture times of 15 and 40 ps were measured for the structures with high and low material gains respectively. The difference in the capture times are related to the fact that for the symmetric waveguide, carriers diffuse into the active region from the uppermost ZnMgSSe cladding layer, yielding a longer rise time for the pump-probe signals for this sample.
[ { "created": "Fri, 17 Jan 2014 12:48:54 GMT", "version": "v1" } ]
2014-01-20
[ [ "Kundys", "D. O.", "" ], [ "Murzyn", "P.", "" ], [ "Wells", "J. P. R.", "" ], [ "Tartakovskii", "A. I.", "" ], [ "Skolnick", "M. S.", "" ], [ "Dang", "Le Si", "" ], [ "Lutsenko", "E. V.", "" ], [ "Tarasuk", "N. P.", "" ], [ "Lyublinskaya", "O. G.", "" ], [ "Toropov", "A. A.", "" ], [ "Ivanov", "S. V.", "" ] ]
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1401.4330
Daniel Weller
Stefan Hetzl and Alexander Leitsch and Giselle Reis and Daniel Weller
Algorithmic Introduction of Quantified Cuts
null
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe a method for inverting Gentzen's cut-elimination in classical first-order logic. Our algorithm is based on first computign a compressed representation of the terms present in the cut-free proof and then cut-formulas that realize such a compression. Finally, a proof using these cut-formulas is constructed. This method allows an exponential compression of proof length. It can be applied to the output of automated theorem provers, which typically produce analytic proofs. An implementation is available on the web and described in this paper.
[ { "created": "Fri, 17 Jan 2014 12:58:52 GMT", "version": "v1" } ]
2014-01-20
[ [ "Hetzl", "Stefan", "" ], [ "Leitsch", "Alexander", "" ], [ "Reis", "Giselle", "" ], [ "Weller", "Daniel", "" ] ]
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1401.4335
Tong Zhou
Tong Zhou
On the Controllability and Observability of Networked Dynamic Systems
30 pages, 1 figure
Automatica, Vol.52, No.1, pp.63-75, 2015
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Some necessary and sufficient conditions are obtained for the controllability and observability of a networked system with linear time invariant (LTI) dynamics. The topology of this system is fixed but arbitrary, and every subsystem is permitted to have different dynamic input-output relations. These conditions essentially depend only on transmission zeros of every subsystem and the connection matrix among subsystems, which makes them attractive in the analysis and synthesis of a large scale networked system. As an application, these conditions are utilized to characterize systems whose steady state estimation accuracy with the distributed predictor developed in (Zhou, 2013) is equal to that of the lumped Kalman filter. Some necessary and sufficient conditions on system matrices are derived for this equivalence. It has been made clear that to guarantee this equivalence, the steady state update gain matrix of the Kalman filter must be block diagonal.
[ { "created": "Fri, 17 Jan 2014 13:26:11 GMT", "version": "v1" } ]
2016-10-12
[ [ "Zhou", "Tong", "" ] ]
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1401.4337
Vahid Jamali
Vahid Jamali, Yasser Karimian, Johannes Huber, Mahmoud Ahmadian
On the Design of Fast Convergent LDPC Codes: An Optimization Approach
Submitted to IEEE Transactions on Communication
null
10.1109/TCOMM.2014.2385858
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The complexity-performance trade-off is a fundamental aspect of the design of low-density parity-check (LDPC) codes. In this paper, we consider LDPC codes for the binary erasure channel (BEC), use code rate for performance metric, and number of decoding iterations to achieve a certain residual erasure probability for complexity metric. We first propose a quite accurate approximation of the number of iterations for the BEC. Moreover, a simple but efficient utility function corresponding to the number of iterations is developed. Using the aforementioned approximation and the utility function, two optimization problems w.r.t. complexity are formulated to find the code degree distributions. We show that both optimization problems are convex. In particular, the problem with the proposed approximation belongs to the class of semi-infinite problems which are computationally challenging to be solved. However, the problem with the proposed utility function falls into the class of semi-definite programming (SDP) and thus, the global solution can be found efficiently using available SDP solvers. Numerical results reveal the superiority of the proposed code design compared to existing code designs from literature.
[ { "created": "Fri, 17 Jan 2014 13:31:29 GMT", "version": "v1" } ]
2016-11-17
[ [ "Jamali", "Vahid", "" ], [ "Karimian", "Yasser", "" ], [ "Huber", "Johannes", "" ], [ "Ahmadian", "Mahmoud", "" ] ]
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1401.4339
Abhishek Bichhawat
Abhishek Bichhawat, Vineet Rajani, Deepak Garg and Christian Hammer
Information Flow Control in WebKit's JavaScript Bytecode
null
null
null
null
cs.CR cs.PL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Websites today routinely combine JavaScript from multiple sources, both trusted and untrusted. Hence, JavaScript security is of paramount importance. A specific interesting problem is information flow control (IFC) for JavaScript. In this paper, we develop, formalize and implement a dynamic IFC mechanism for the JavaScript engine of a production Web browser (specifically, Safari's WebKit engine). Our IFC mechanism works at the level of JavaScript bytecode and hence leverages years of industrial effort on optimizing both the source to bytecode compiler and the bytecode interpreter. We track both explicit and implicit flows and observe only moderate overhead. Working with bytecode results in new challenges including the extensive use of unstructured control flow in bytecode (which complicates lowering of program context taints), unstructured exceptions (which complicate the matter further) and the need to make IFC analysis permissive. We explain how we address these challenges, formally model the JavaScript bytecode semantics and our instrumentation, prove the standard property of termination-insensitive non-interference, and present experimental results on an optimized prototype.
[ { "created": "Fri, 17 Jan 2014 13:38:08 GMT", "version": "v1" }, { "created": "Tue, 21 Jan 2014 09:01:09 GMT", "version": "v2" } ]
2014-01-22
[ [ "Bichhawat", "Abhishek", "" ], [ "Rajani", "Vineet", "" ], [ "Garg", "Deepak", "" ], [ "Hammer", "Christian", "" ] ]
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1401.4349
Simon Huisman R.
S.R. Huisman, T.J. Huisman, S.A. Goorden, A.P. Mosk, and P.W.H. Pinkse
Programming balanced optical beam splitters in white paint
null
Optics Express, Vol. 22 Issue 7, pp.8320-8332 (2014)
10.1364/OE.22.008320
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Wavefront shaping allows for ultimate control of light propagation in multiple-scattering media by adaptive manipulation of incident waves. We shine two separate wavefront-shaped beams on a layer of dry white paint to create two enhanced output speckle spots of equal intensity. We experimentally confirm by interference measurements that the output speckle spots are almost correlated like the two outputs of an ideal balanced beam splitter. The observed deviations from the phase behavior of an ideal beam splitter are analyzed with a transmission matrix model. Our experiments demonstrate that wavefront shaping in multiple-scattering media can be used to approximate the functionality of linear optical devices with multiple inputs and outputs.
[ { "created": "Fri, 17 Jan 2014 14:06:27 GMT", "version": "v1" } ]
2014-08-11
[ [ "Huisman", "S. R.", "" ], [ "Huisman", "T. J.", "" ], [ "Goorden", "S. A.", "" ], [ "Mosk", "A. P.", "" ], [ "Pinkse", "P. W. H.", "" ] ]
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1401.4350
Lorenzo Rovigatti
Lorenzo Rovigatti, Petr \v{S}ulc, Istv\'an Z. Reguly, Flavio Romano
A comparison between parallelization approaches in molecular dynamics simulations on GPUs
10 pages, 6 figures
null
null
null
physics.comp-ph cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We test the performances of two different approaches to the computation of forces for molecular dynamics simulations on Graphics Processing Units. A "vertex-based" approach, where a computing thread is started per particle, is compared to a newly proposed "edge-based" approach, where a thread is started per each potentially non-zero interaction. We find that the former is more efficient for systems with many simple interactions per particle, while the latter is more efficient if the system has more complicated interactions or fewer of them. By comparing computation times on more and less recent GPU technology, we predict that, if the current trend of increasing the number of processing cores - as opposed to their computing power - remains, the "edge-based" approach will gradually become the most efficient choice in an increasing number of cases.
[ { "created": "Fri, 17 Jan 2014 14:06:46 GMT", "version": "v1" }, { "created": "Tue, 30 Sep 2014 09:24:32 GMT", "version": "v2" } ]
2014-10-01
[ [ "Rovigatti", "Lorenzo", "" ], [ "Šulc", "Petr", "" ], [ "Reguly", "István Z.", "" ], [ "Romano", "Flavio", "" ] ]
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1401.4351
Johan Anderson
Johan Anderson, Eun-jin Kim and Sara Moradi
A Fractional Fokker-Planck Model for Anomalous Diffusion
22 pages, 14 figures
Physics of Plasmas 21, 122109 (2014)
10.1063/1.4904201
null
physics.plasm-ph cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we present a study of anomalous diffusion using a Fokker-Planck description with fractional velocity derivatives. The distribution functions are found using numerical means for varying degree of fractionality observing the transition from a Gaussian distribution to a L\'evy distribution. The statistical properties of the distribution functions are assessed by a generalized expectation measure and entropy in terms of Tsallis statistical mechanics. We find that the ratio of the generalized entropy and expectation is increasing with decreasing fractionality towards the well known so-called sub-diffusive domain, indicating a self-organising behavior.
[ { "created": "Fri, 17 Jan 2014 14:08:24 GMT", "version": "v1" }, { "created": "Wed, 17 Dec 2014 16:29:54 GMT", "version": "v2" } ]
2014-12-18
[ [ "Anderson", "Johan", "" ], [ "Kim", "Eun-jin", "" ], [ "Moradi", "Sara", "" ] ]
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1401.4356
Robert Brady
Robert Brady and Ross Anderson
Why bouncing droplets are a pretty good model of quantum mechanics
null
null
null
null
quant-ph physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In 2005, Couder, Protiere, Fort and Badouad showed that oil droplets bouncing on a vibrating tray of oil can display nonlocal interactions reminiscent of the particle-wave associations in quantum mechanics; in particular they can move, attract, repel and orbit each other. Subsequent experimental work by Couder, Fort, Protiere, Eddi, Sultan, Moukhtar, Rossi, Molacek, Bush and Sbitnev has established that bouncing drops exhibit single-slit and double-slit diffraction, tunnelling, quantised energy levels, Anderson localisation and the creation/annihilation of droplet/bubble pairs. In this paper we explain why. We show first that the surface waves guiding the droplets are Lorentz covariant with the characteristic speed c of the surface waves; second, that pairs of bouncing droplets experience an inverse-square force of attraction or repulsion according to their relative phase, and an analogue of the magnetic force; third, that bouncing droplets are governed by an analogue of Schroedinger's equation where Planck's constant is replaced by an appropriate constant of the motion; and fourth, that orbiting droplet pairs exhibit spin-half symmetry and align antisymmetrically as in the Pauli exclusion principle. Our analysis explains the similarities between bouncing-droplet experiments and the behaviour of quantum-mechanical particles. It also enables us to highlight some differences, and to predict some surprising phenomena that can be tested in feasible experiments.
[ { "created": "Thu, 16 Jan 2014 05:04:21 GMT", "version": "v1" } ]
2014-01-20
[ [ "Brady", "Robert", "" ], [ "Anderson", "Ross", "" ] ]
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1401.4357
Georg Wachter
Georg Wachter, Christoph Lemell, Joachim Burgd\"orfer, Shunsuke A. Sato, Xiao-Min Tong, Kazuhiro Yabana
Ab Initio Simulation of Electrical Currents Induced by Ultrafast Laser Excitation of Dielectric Materials
Accepted version
Phys. Rev. Lett. 113, 087401 (2014)
10.1103/PhysRevLett.113.087401
null
cond-mat.mtrl-sci cond-mat.mes-hall physics.comp-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We theoretically investigate the generation of ultrafast currents in insulators induced by strong few-cycle laser pulses. Ab initio simulations based on time-dependent density functional theory give insight into the atomic-scale properties of the induced current signifying a femtosecond-scale insulator-metal transition. We observe the transition from nonlinear polarization currents during the laser pulse at low intensities to tunnelinglike excitation into the conduction band at higher laser intensities. At high intensities, the current persists after the conclusion of the laser pulse considered to be the precursor of the dielectric breakdown on the femtosecond scale. We show that the transferred charge sensitively depends on the orientation of the polarization axis relative to the crystal axis suggesting that the induced charge separation reflects the anisotropic electronic structure. We find good agreement with very recent experimental data on the intensity and carrierenvelope phase dependence [A. Schiffrin et al., Nature (London) 493, 70 (2013)].
[ { "created": "Fri, 17 Jan 2014 14:28:16 GMT", "version": "v1" }, { "created": "Mon, 25 Aug 2014 11:47:08 GMT", "version": "v2" } ]
2014-08-26
[ [ "Wachter", "Georg", "" ], [ "Lemell", "Christoph", "" ], [ "Burgdörfer", "Joachim", "" ], [ "Sato", "Shunsuke A.", "" ], [ "Tong", "Xiao-Min", "" ], [ "Yabana", "Kazuhiro", "" ] ]
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1401.4359
Thomas Czerniuk
T. Czerniuk, C. Brueggemann, J. Tepper, S. Brodbeck, C. Schneider, M. Kamp, S. Hoefling, B. A. Glavin, D. R. Yakovlev, A. V. Akimov, and M. Bayer
Controlled lasing from active optomechanical resonators
null
null
10.1038/ncomms5038
null
cond-mat.mes-hall physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Planar microcavities with distributed Bragg reflectors (DBRs) host, besides confined optical modes, also mechanical resonances due to stop bands in the phonon dispersion relation of the DBRs. These resonances have frequencies in the sub-terahertz (10E10-10E11 Hz) range with quality factors exceeding 1000. The interaction of photons and phonons in such optomechanical systems can be drastically enhanced, opening a new route toward manipulation of light. Here we implemented active semiconducting layers into the microcavity to obtain a vertical-cavity surface-emitting laser (VCSEL). Thereby three resonant excitations -photons, phonons, and electrons- can interact strongly with each other providing control of the VCSEL laser emission: a picosecond strain pulse injected into the VCSEL excites long-living mechanical resonances therein. As a result, modulation of the lasing intensity at frequencies up to 40 GHz is observed. From these findings prospective applications such as THz laser control and stimulated phonon emission may emerge.
[ { "created": "Fri, 17 Jan 2014 14:29:39 GMT", "version": "v1" } ]
2015-06-18
[ [ "Czerniuk", "T.", "" ], [ "Brueggemann", "C.", "" ], [ "Tepper", "J.", "" ], [ "Brodbeck", "S.", "" ], [ "Schneider", "C.", "" ], [ "Kamp", "M.", "" ], [ "Hoefling", "S.", "" ], [ "Glavin", "B. A.", "" ], [ "Yakovlev", "D. R.", "" ], [ "Akimov", "A. V.", "" ], [ "Bayer", "M.", "" ] ]
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1401.4362
Philippe Trinh
Philippe H. Trinh, Hyoungsoo Kim, Naima Hammoud, Peter D. Howell, S. Jonathan Chapman and Howard A. Stone
Curvature suppresses the Rayleigh-Taylor instability
null
Phys. Fluids 26, 051704 (2014)
10.1063/1.4876476
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The dynamics of a thin liquid film on the underside of a curved cylindrical substrate is studied. The evolution of the liquid layer is investigated as the film thickness and the radius of curvature of the substrate are varied. A dimensionless parameter (a modified Bond number) that incorporates both geometric parameters, gravity, and surface tension is identified, and allows the observations to be classified according to three different flow regimes: stable films, films with transient growth of perturbations followed by decay, and unstable films. Experiments and theory confirm that, below a critical value of the Bond number, curvature of the substrate suppresses the Rayleigh-Taylor instability.
[ { "created": "Fri, 17 Jan 2014 14:30:32 GMT", "version": "v1" }, { "created": "Mon, 20 Jan 2014 10:47:44 GMT", "version": "v2" } ]
2014-09-26
[ [ "Trinh", "Philippe H.", "" ], [ "Kim", "Hyoungsoo", "" ], [ "Hammoud", "Naima", "" ], [ "Howell", "Peter D.", "" ], [ "Chapman", "S. Jonathan", "" ], [ "Stone", "Howard A.", "" ] ]
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1401.4374
Facundo Carreiro
Facundo Carreiro, Alessandro Facchini, Yde Venema, Fabio Zanasi
Weak MSO: Automata and Expressiveness Modulo Bisimilarity
Technical Report, 57 pages
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove that the bisimulation-invariant fragment of weak monadic second-order logic (WMSO) is equivalent to the fragment of the modal $\mu$-calculus where the application of the least fixpoint operator $\mu p.\varphi$ is restricted to formulas $\varphi$ that are continuous in $p$. Our proof is automata-theoretic in nature; in particular, we introduce a class of automata characterizing the expressive power of WMSO over tree models of arbitrary branching degree. The transition map of these automata is defined in terms of a logic $\mathrm{FOE}_1^\infty$ that is the extension of first-order logic with a generalized quantifier $\exists^\infty$, where $\exists^\infty x. \phi$ means that there are infinitely many objects satisfying $\phi$. An important part of our work consists of a model-theoretic analysis of $\mathrm{FOE}_1^\infty$.
[ { "created": "Fri, 17 Jan 2014 14:52:06 GMT", "version": "v1" }, { "created": "Wed, 22 Jan 2014 17:46:41 GMT", "version": "v2" } ]
2014-01-23
[ [ "Carreiro", "Facundo", "" ], [ "Facchini", "Alessandro", "" ], [ "Venema", "Yde", "" ], [ "Zanasi", "Fabio", "" ] ]
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1401.4381
Khaled Khalil
Khaled M. Khalil, M. Abdel-Aziz, Taymour T. Nazmy, Abdel-Badeeh M. Salem
Intelligent Techniques for Resolving Conflicts of Knowledge in Multi-Agent Decision Support Systems
5 pages, 1 table, Sixth International Conference on Intelligence Computing and Information Systems, Cairo, Egypt, 2013
null
null
null
cs.MA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper focuses on some of the key intelligent techniques for conflict resolution in Multi-Agent Decision Support Systems.
[ { "created": "Fri, 17 Jan 2014 15:17:14 GMT", "version": "v1" } ]
2014-01-20
[ [ "Khalil", "Khaled M.", "" ], [ "Abdel-Aziz", "M.", "" ], [ "Nazmy", "Taymour T.", "" ], [ "Salem", "Abdel-Badeeh M.", "" ] ]
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1401.4383
Sascha Kurz
Sascha Kurz and J\"org Rambau
On the Hegselmann-Krause conjecture in opinion dynamics
22 pages, 8 figures
Journal of Difference Equations and Applications, Vol. 17, Nr. 6 (2011), Pages 859-876
null
null
math.DS cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We give an elementary proof of a conjecture by Hegselmann and Krause in opinion dynamics, concerning a symmetric bounded confidence interval model: If there is a truth and all individuals take each other seriously by a positive amount bounded away from zero, then all truth seekers will converge to the truth. Here truth seekers are the individuals which are attracted by the truth by a positive amount. In the absence of truth seekers it was already shown by Hegselmann and Krause that the opinions of the individuals converge.
[ { "created": "Fri, 17 Jan 2014 15:26:56 GMT", "version": "v1" } ]
2014-01-20
[ [ "Kurz", "Sascha", "" ], [ "Rambau", "Jörg", "" ] ]
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1401.4387
Enrico Moretto
Fausto Bonacina, Marco D'Errico, Enrico Moretto, Silvana Stefani, Anna Torriero
A Multiple Network Approach to Corporate Governance
version 2
null
null
null
q-fin.GN cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work, we consider Corporate Governance (CG) ties among companies from a multiple network perspective. Such a structure naturally arises from the close interrelation between the Shareholding Network (SH) and the Board of Directors network (BD). In order to capture the simultaneous effects of both networks on CG, we propose to model the CG multiple network structure via tensor analysis. In particular, we consider the TOPHITS model, based on the PARAFAC tensor decomposition, to show that tensor techniques can be successfully applied in this context. By providing some empirical results from the Italian financial market in the univariate case, we then show that a tensor--based multiple network approach can reveal important information.
[ { "created": "Fri, 17 Jan 2014 15:38:40 GMT", "version": "v1" }, { "created": "Tue, 6 May 2014 11:10:51 GMT", "version": "v2" } ]
2014-05-07
[ [ "Bonacina", "Fausto", "" ], [ "D'Errico", "Marco", "" ], [ "Moretto", "Enrico", "" ], [ "Stefani", "Silvana", "" ], [ "Torriero", "Anna", "" ] ]
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1401.4392
Krisztina Marton
K. Marton, G. Kiss, A. Laszlo, D. Varga
Low Momentum Particle Detector for the NA61 Experiment at CERN
null
null
10.1016/j.nima.2014.06.014
null
physics.ins-det hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The NA61 Experiment at CERN SPS is a large acceptance hadron spectrometer, aimed to studying of hadron-hadron, hadron-nucleus, and nucleus-nucleus interactions in a fixed target environment. The present paper discusses the construction and performance of the Low Momentum Particle Detector (LMPD), a small time projection chamber unit which has been added to the NA61 setup in 2012. The LMPD considerably extends the detector acceptance towards the backward region, surrounding the target in hadron-nucleus interactions. The LMPD features simultaneous range and ionization measurements, which allows for particle identification and momentum measurement in the 0.1-0.25 GeV/c momentum range for protons. The possibility of Z=1 particle identification in this range is directly demonstrated.
[ { "created": "Fri, 17 Jan 2014 15:58:47 GMT", "version": "v1" }, { "created": "Wed, 11 Jun 2014 13:42:36 GMT", "version": "v2" } ]
2015-06-18
[ [ "Marton", "K.", "" ], [ "Kiss", "G.", "" ], [ "Laszlo", "A.", "" ], [ "Varga", "D.", "" ] ]
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1401.4396
Andrew Adamatzky
Andrew Adamatzky
Towards plant wires
null
null
null
null
cs.ET physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In experimental laboratory studies we evaluate a possibility of making electrical wires from living plants. In scoping experiments we use lettuce seedlings as a prototype model of a plant wire. We approximate an electrical potential transfer function by applying direct current voltage to the lettuce seedlings and recording output voltage. We analyse oscillation frequencies of the output potential and assess noise immunity of the plant wires. Our findings will be used in future designs of self-growing wetware circuits and devices, and integration of plant-based electronic components into future and emergent bio-hybrid systems.
[ { "created": "Fri, 17 Jan 2014 16:06:57 GMT", "version": "v1" } ]
2014-01-20
[ [ "Adamatzky", "Andrew", "" ] ]
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1401.4412
Krishna Venkateswara
Krishna Venkateswara, Charles A. Hagedorn, Matthew D. Turner, Trevor Arp, Jens H. Gundlach
A high-precision mechanical absolute-rotation sensor
null
Rev. Sci. Instrum. 85, 015005 (2014)
10.1063/1.4862816
null
physics.ins-det physics.geo-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have developed a mechanical absolute-rotation sensor capable of resolving ground rotation angle of less than 1 nrad$/\sqrt{\text{Hz}}$ above $30$ mHz and 0.2 nrad$/\sqrt{\text{Hz}}$ above $100$ mHz about a single horizontal axis. The device consists of a meter-scale beam balance, suspended by a pair of flexures, with a resonance frequency of 10.8 mHz. The center of mass is located 3 $\mu$m above the pivot, giving an excellent horizontal displacement rejection of better than $3\times10^{-5}$ rad/m. The angle of the beam is read out optically using a high-sensitivity autocollimator. We have also built a tiltmeter with better than 1 nrad$/\sqrt{\text{Hz}}$ sensitivity above 30 mHz. Co-located measurements using the two instruments allowed us to distinguish between background rotation signal at low frequencies and intrinsic instrument noise. The rotation sensor is useful for rotational seismology and for rejecting background rotation signal from seismometers in experiments demanding high levels of seismic isolation, such as Advanced LIGO.
[ { "created": "Thu, 16 Jan 2014 18:57:48 GMT", "version": "v1" } ]
2014-01-30
[ [ "Venkateswara", "Krishna", "" ], [ "Hagedorn", "Charles A.", "" ], [ "Turner", "Matthew D.", "" ], [ "Arp", "Trevor", "" ], [ "Gundlach", "Jens H.", "" ] ]
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1401.4420
Roman Kontchakov
Stanislav Kikot, Roman Kontchakov, Vladimir Podolskii and Michael Zakharyaschev
On the Succinctness of Query Rewriting over OWL 2 QL Ontologies with Shallow Chases
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null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the size of first-order rewritings of conjunctive queries over OWL 2 QL ontologies of depth 1 and 2 by means of hypergraph programs computing Boolean functions. Both positive and negative results are obtained. Conjunctive queries over ontologies of depth 1 have polynomial-size nonrecursive datalog rewritings; tree-shaped queries have polynomial positive existential rewritings; however, in the worst case, positive existential rewritings can only be of superpolynomial size. Positive existential and nonrecursive datalog rewritings of queries over ontologies of depth 2 suffer an exponential blowup in the worst case, while first-order rewritings are superpolynomial unless $\text{NP} \subseteq \text{P}/\text{poly}$. We also analyse rewritings of tree-shaped queries over arbitrary ontologies and observe that the query entailment problem for such queries is fixed-parameter tractable.
[ { "created": "Fri, 17 Jan 2014 18:03:08 GMT", "version": "v1" }, { "created": "Wed, 22 Jan 2014 10:22:59 GMT", "version": "v2" } ]
2014-01-23
[ [ "Kikot", "Stanislav", "" ], [ "Kontchakov", "Roman", "" ], [ "Podolskii", "Vladimir", "" ], [ "Zakharyaschev", "Michael", "" ] ]
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1401.4424
Thomas Caswell
Thomas A. Caswell
Dynamics of Vapor Layer Under a Leidenfrost Drop
11 pages, 12 figures, University of Chicago PhD Thesis
Phys. Rev. E 90, 013014 (2014)
10.1103/PhysRevE.90.013014
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the Leidenfrost effect a small drop of fluid is levitated above a sufficiently hot surface, on a persistent vapor layer generated by evaporation from the drop. The vapor layer thermally insulates the drop from the surface leading to extraordinarily long drop lifetimes. The top-view shape of the levitated drops can exhibit persistent star-like vibrations. I extend recent work [Burton et al. PRL 2012] to study the bottom surface of the drop using interference-imaging. In this work I use a high-speed camera and automated image analysis to image, locate and classify the interference fringes. From the interference fringes I reconstruct the shape and height profile of the rim where the drop is closest to the surface. I measure the drop-size dependence of the planar vibrational mode frequencies, which agree well with previous work. I observe a distinct breathing mode in the average radius of the drop, the frequency of which scales differently with drop size than the other modes. This breathing mode can be tightly coupled to a vertical motion of the drop. I further observe a qualitative difference in the structure and dynamics of the vertical profile of the rim between large and small drops.
[ { "created": "Fri, 17 Jan 2014 18:12:39 GMT", "version": "v1" } ]
2014-07-30
[ [ "Caswell", "Thomas A.", "" ] ]
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1401.4426
Andreas Fring
Sanjib Dey, Andreas Fring and Thilagarajah Mathanaranjan
Non-Hermitian systems of Euclidean Lie algebraic type with real eigenvalue spectra
17 pages, 5 figures
Annals of Physics, 346 (2014) 28-41
10.1016/j.aop.2014.04.002
null
quant-ph math-ph math.MP physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study several classes of non-Hermitian Hamiltonian systems, which can be expressed in terms of bilinear combinations of Euclidean Lie algebraic generators. The classes are distinguished by different versions of antilinear (PT)-symmetries exhibiting various types of qualitative behaviour. On the basis of explicitly computed non-perturbative Dyson maps we construct metric operators, isospectral Hermitian counterparts for which we solve the corresponding time-independent Schroedinger equation for specific choices of the coupling constants. In these cases general analytical expressions for the solutions are obtained in the form of Mathieu functions, which we analyze numerically to obtain the corresponding energy eigenspectra. We identify regions in the parameter space for which the corresponding spectra are entirely real and also domains where the PT symmetry is spontaneously broken and sometimes also regained at exceptional points. In some cases it is shown explicitly how the threshold region from real to complex spectra is characterized by the breakdown of the Dyson maps or the metric operator. We establish the explicit relationship to models currently under investigation in the context of beam dynamics in optical lattices.
[ { "created": "Fri, 17 Jan 2014 18:18:02 GMT", "version": "v1" } ]
2014-04-29
[ [ "Dey", "Sanjib", "" ], [ "Fring", "Andreas", "" ], [ "Mathanaranjan", "Thilagarajah", "" ] ]
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1401.4428
Jeremy Hoskins
Anna C. Gilbert, Jeremy G. Hoskins, John C. Schotland
Diffuse Scattering on Graphs
null
null
null
null
math.CO cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We formulate and analyze difference equations on graphs analogous to time-independent diffusion equations arising in the study of diffuse scattering in continuous media. Moreover, we show how to construct solutions in the presence of weak scatterers from the solution to the homogeneous (background problem) using Born series, providing necessary conditions for convergence and demonstrating the process through numerous examples. In addition, we outline a method for finding Green's functions for Cayley graphs for both abelian and non-abelian groups. Finally, we conclude with a discussion of the effects of sparsity on our method and results, outlining the simplifications that can be made provided that the scatterers are weak and well-separated.
[ { "created": "Fri, 17 Jan 2014 18:30:19 GMT", "version": "v1" }, { "created": "Tue, 1 Nov 2016 20:12:43 GMT", "version": "v2" } ]
2016-11-03
[ [ "Gilbert", "Anna C.", "" ], [ "Hoskins", "Jeremy G.", "" ], [ "Schotland", "John C.", "" ] ]
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1401.4436
Muhammad Arshad Ul Abedin
Muhammad Arshad Ul Abedin, Vincent Ng, Latifur Khan
Cause Identification from Aviation Safety Incident Reports via Weakly Supervised Semantic Lexicon Construction
null
Journal Of Artificial Intelligence Research, Volume 38, pages 569-631, 2010
10.1613/jair.2986
null
cs.CL cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Aviation Safety Reporting System collects voluntarily submitted reports on aviation safety incidents to facilitate research work aiming to reduce such incidents. To effectively reduce these incidents, it is vital to accurately identify why these incidents occurred. More precisely, given a set of possible causes, or shaping factors, this task of cause identification involves identifying all and only those shaping factors that are responsible for the incidents described in a report. We investigate two approaches to cause identification. Both approaches exploit information provided by a semantic lexicon, which is automatically constructed via Thelen and Riloffs Basilisk framework augmented with our linguistic and algorithmic modifications. The first approach labels a report using a simple heuristic, which looks for the words and phrases acquired during the semantic lexicon learning process in the report. The second approach recasts cause identification as a text classification problem, employing supervised and transductive text classification algorithms to learn models from incident reports labeled with shaping factors and using the models to label unseen reports. Our experiments show that both the heuristic-based approach and the learning-based approach (when given sufficient training data) outperform the baseline system significantly.
[ { "created": "Thu, 16 Jan 2014 04:53:44 GMT", "version": "v1" } ]
2014-01-20
[ [ "Abedin", "Muhammad Arshad Ul", "" ], [ "Ng", "Vincent", "" ], [ "Khan", "Latifur", "" ] ]
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1401.4441
Jose Gracia
Christoph Niethammer, Colin W. Glass, Jose Gracia
Avoiding Serialization Effects in Data-Dependency aware Task Parallel Algorithms for Spatial Decomposition
6 pages, 9 figures, published at ISPA2012
null
null
null
cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Spatial decomposition is a popular basis for parallelising code. Cast in the frame of task parallelism, calculations on a spatial domain can be treated as a task. If neighbouring domains interact and share results, access to the specific data needs to be synchronized to avoid race conditions. This is the case for a variety of applications, like most molecular dynamics and many computational fluid dynamics codes. Here we present an unexpected problem which can occur in dependency-driven task parallelization models like StarSs: the tasks accessing a specific spatial domain are treated as interdependent, as dependencies are detected automatically via memory addresses. Thus, the order in which tasks are generated will have a severe impact on the dependency tree. In the worst case, a complete serialization is reached and no two tasks can be calculated in parallel. We present the problem in detail based on an example from molecular dynamics, and introduce a theoretical framework to calculate the degree of serialization. Furthermore, we present strategies to avoid this unnecessary problem. We recommend treating these strategies as best practice when using dependency-driven task parallel programming models like StarSs on such scenarios.
[ { "created": "Fri, 17 Jan 2014 19:28:10 GMT", "version": "v1" } ]
2014-01-20
[ [ "Niethammer", "Christoph", "" ], [ "Glass", "Colin W.", "" ], [ "Gracia", "Jose", "" ] ]
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1401.4443
Remus Brad
Nusrat Fatema and Remus Brad
Attacks And Counterattacks On Wireless Sensor Networks
null
Nusrat Fatema and Remus Brad, Attacks and Counterattacks on Wireless Sensor Networks, International Journal of Ad hoc, Sensor and Ubiquitous Computing, vol. 4(6), pp. 1-15, December 2013
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
WSN is formed by autonomous nodes with partial memory, communication range, power, and bandwidth. Their occupation depends on inspecting corporal and environmental conditions and communing through a system and performing data processing. The application field is vast, comprising military, ecology, healthcare, home or commercial and require a highly secured communication. The paper analyses different types of attacks and counterattacks and provides solutions for the WSN threats
[ { "created": "Fri, 17 Jan 2014 19:43:42 GMT", "version": "v1" } ]
2014-01-20
[ [ "Fatema", "Nusrat", "" ], [ "Brad", "Remus", "" ] ]
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1401.4446
Remus Brad
Cosmin Basca, Mihai Talos, Remus Brad
Humanoid Robot With Vision Recognition Control System
null
Proceedings of The International Symposium on System Theory, Automation, Robotics, Computers, Informatics, Electronics and Instrumentation, pp. 243-248, 20-22 October 2005, Craiova, Romania, ISBN 973-742-148-5
null
null
cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a solution to controlling humanoid robotic systems. The robot can be programmed to execute certain complex actions based on basic motion primitives. The humanoid robot is programmed using a PC. The software running on the PC can obtain at any given moment information about the state of the robot, or it can program the robot to execute a different action, providing the possibility of implementing a complex behavior. We want to provide the robotic system the ability to understand more on the external real world. In this paper we describe a method for detecting ellipses in real world images using the Randomized Hough Transform with Result Clustering. Real world images are preprocessed, noise reduction, greyscale transform, edge detection and finaly binarization in order to be processed by the actual ellipse detector. After all the ellipses are detected a post processing phase clusters the results.
[ { "created": "Fri, 17 Jan 2014 19:55:24 GMT", "version": "v1" } ]
2014-01-20
[ [ "Basca", "Cosmin", "" ], [ "Talos", "Mihai", "" ], [ "Brad", "Remus", "" ] ]
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1401.4451
Swanand Kadhe
Swanand Kadhe, Sidharth Jaggi, Mayank Bakshi, and Alex Sprintson
Reliable, Deniable, and Hidable Communication over Multipath Networks
26 pages, 4 figures; Extended version of the paper submitted for ISIT 2014
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the scenario wherein Alice wants to (potentially) communicate to the intended receiver Bob over a network consisting of multiple parallel links in the presence of a passive eavesdropper Willie, who observes an unknown subset of links. A primary goal of our communication protocol is to make the communication "deniable", {\it i.e.}, Willie should not be able to {\it reliably} estimate whether or not Alice is transmitting any {\it covert} information to Bob. Moreover, if Alice is indeed actively communicating, her covert messages should be information-theoretically "hidable" in the sense that Willie's observations should not {\it leak any information} about Alice's (potential) message to Bob -- our notion of hidability is slightly stronger than the notion of information-theoretic strong secrecy well-studied in the literature, and may be of independent interest. It can be shown that deniability does not imply either hidability or (weak or strong) information-theoretic secrecy; nor does any form of information-theoretic secrecy imply deniability. We present matching inner and outer bounds on the capacity for deniable and hidable communication over {\it multipath networks}.
[ { "created": "Fri, 17 Jan 2014 20:50:29 GMT", "version": "v1" }, { "created": "Wed, 29 Jan 2014 02:03:03 GMT", "version": "v2" } ]
2014-01-30
[ [ "Kadhe", "Swanand", "" ], [ "Jaggi", "Sidharth", "" ], [ "Bakshi", "Mayank", "" ], [ "Sprintson", "Alex", "" ] ]
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1401.4453
Ali Aghamohammadi
A. Aghamohammadi
Resembling holographic dark energy with f(R)gravity as scalar field and ghost dark energy with tachyon scalar fields
5 pages. 1figures
null
10.1007/s10773-014-2239-x
IJTP-D-14-00185R1
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this article,the dynamics and potential of two different scalar field models is presented in a at Friedmann-Lemaitre-Robertson-Walker(FLRW) universe. One of those models is obtained from the corresponding relation between holographic energy density (HED) with energy density of the corresponding scalar field of f(R) gravity,and other models is achieved from connection between the ghost energy density (GDE) with energy density of the tachyon field model. Also, a f(R) model according to the the HDE model is calculated then stability,anti -gravity and viable conditions on it are investigated.
[ { "created": "Sat, 18 Jan 2014 13:26:40 GMT", "version": "v1" }, { "created": "Sun, 16 Feb 2014 12:28:03 GMT", "version": "v2" }, { "created": "Sat, 22 Feb 2014 09:08:55 GMT", "version": "v3" } ]
2014-07-10
[ [ "Aghamohammadi", "A.", "" ] ]
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1401.4455
Alexey Slunyaev
Victor Shrira and Alexey Slunyaev
Nonlinear dynamics of trapped waves on jet currents and rogue waves
4 pages, 2 figures, 3 movies (supplemental materials, not enclosed to this submission)
Phys. Rev. E. 89, 041002(R) (2014)
10.1103/PhysRevE.89.041002
null
physics.flu-dyn physics.geo-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Nonlinear dynamics of surface gravity waves trapped by an opposing jet current is studied analytically and numerically. For wave fields narrowband in frequency but not necessarily with narrow angular distributions the developed asymptotic weakly nonlinear theory based on the modal approach of (V. Shrira, A. Slunyaev, J. Fluid. Mech, 738, 65, 2014) leads to the one-dimensional modified nonlinear Schr\"{o}dinger equation of self-focusing type for a single mode. Its solutions such as envelope solitons and breathers are considered to be prototypes of rogue waves; these solutions, in contrast to waves in the absence of currents, are robust with respect to transverse perturbations, which suggests potentially higher probability of rogue waves. Robustness of the long-lived analytical solutions in form of the modulated trapped waves and solitary wave groups is verified by direct numerical simulations of potential Euler equations.
[ { "created": "Sat, 18 Jan 2014 08:45:48 GMT", "version": "v1" } ]
2017-03-17
[ [ "Shrira", "Victor", "" ], [ "Slunyaev", "Alexey", "" ] ]
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1401.4472
Rushed Kanawati
Rushed Kanawati
YASCA: A collective intelligence approach for community detection in complex networks
4pags
null
null
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we present an original approach for community detection in complex networks. The approach belongs to the family of seed-centric algorithms. However, instead of expanding communities around selected seeds as most of existing approaches do, we explore here applying an ensemble clustering approach to different network partitions derived from ego-centered communities computed for each selected seed. Ego-centered communities are themselves computed applying a recently proposed ensemble ranking based approach that allow to efficiently combine various local modularities used to guide a greedy optimisation process. Results of first experiments on real world networks for which a ground truth decomposition into communities are known, argue for the validity of our approach.
[ { "created": "Fri, 17 Jan 2014 21:35:08 GMT", "version": "v1" } ]
2014-01-21
[ [ "Kanawati", "Rushed", "" ] ]
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1401.4477
Lukas Einkemmer
Nicolas Crouseilles and Lukas Einkemmer and Erwan Faou
A Hamiltonian splitting for the Vlasov-Maxwell system
null
Journal of Computational Physics, Volume 283, 15 February 2015, Pages 224-240
10.1016/j.jcp.2014.11.029
null
math.NA cs.NA physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new splitting is proposed for solving the Vlasov-Maxwell system. This splitting is based on a decomposition of the Hamiltonian of the Vlasov-Maxwell system and allows for the construction of arbitrary high order methods by composition (independent of the specific deterministic method used for the discretization of the phase space). Moreover, we show that for a spectral method in space this scheme satisfies Poisson's equation without explicitly solving it. Finally, we present some examples in the context of the time evolution of an electromagnetic plasma instability which emphasizes the excellent behavior of the new splitting compared to methods from the literature.
[ { "created": "Fri, 17 Jan 2014 21:39:09 GMT", "version": "v1" } ]
2017-01-06
[ [ "Crouseilles", "Nicolas", "" ], [ "Einkemmer", "Lukas", "" ], [ "Faou", "Erwan", "" ] ]
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1401.4484
Eitan Yaakobi
Sarit Buzaglo and Eitan Yaakobi
Constrained Codes for Rank Modulation
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Motivated by the rank modulation scheme, a recent work by Sala and Dolecek explored the study of constraint codes for permutations. The constraint studied by them is inherited by the inter-cell interference phenomenon in flash memories, where high-level cells can inadvertently increase the level of low-level cells. In this paper, the model studied by Sala and Dolecek is extended into two constraints. A permutation $\sigma \in S_n$ satisfies the \emph{two-neighbor $k$-constraint} if for all $2 \leq i \leq n-1$ either $|\sigma(i-1)-\sigma(i)|\leq k$ or $|\sigma(i)-\sigma(i+1)|\leq k$, and it satisfies the \emph{asymmetric two-neighbor $k$-constraint} if for all $2 \leq i \leq n-1$, either $\sigma(i-1)-\sigma(i) < k$ or $\sigma(i+1)-\sigma(i) < k$. We show that the capacity of the first constraint is $(1+\epsilon)/2$ in case that $k=\Theta(n^{\epsilon})$ and the capacity of the second constraint is 1 regardless to the value of $k$. We also extend our results and study the capacity of these two constraints combined with error-correction codes in the Kendall's $\tau$ metric.
[ { "created": "Fri, 17 Jan 2014 22:12:18 GMT", "version": "v1" } ]
2014-01-21
[ [ "Buzaglo", "Sarit", "" ], [ "Yaakobi", "Eitan", "" ] ]
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1401.4489
Devansh Arpit
Devansh Arpit, Ifeoma Nwogu, Gaurav Srivastava, Venu Govindaraju
An Analysis of Random Projections in Cancelable Biometrics
null
null
null
null
cs.CV cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
With increasing concerns about security, the need for highly secure physical biometrics-based authentication systems utilizing \emph{cancelable biometric} technologies is on the rise. Because the problem of cancelable template generation deals with the trade-off between template security and matching performance, many state-of-the-art algorithms successful in generating high quality cancelable biometrics all have random projection as one of their early processing steps. This paper therefore presents a formal analysis of why random projections is an essential step in cancelable biometrics. By formally defining the notion of an \textit{Independent Subspace Structure} for datasets, it can be shown that random projection preserves the subspace structure of data vectors generated from a union of independent linear subspaces. The bound on the minimum number of random vectors required for this to hold is also derived and is shown to depend logarithmically on the number of data samples, not only in independent subspaces but in disjoint subspace settings as well. The theoretical analysis presented is supported in detail with empirical results on real-world face recognition datasets.
[ { "created": "Fri, 17 Jan 2014 23:21:56 GMT", "version": "v1" }, { "created": "Wed, 5 Feb 2014 02:57:25 GMT", "version": "v2" }, { "created": "Fri, 14 Nov 2014 02:38:09 GMT", "version": "v3" } ]
2015-05-22
[ [ "Arpit", "Devansh", "" ], [ "Nwogu", "Ifeoma", "" ], [ "Srivastava", "Gaurav", "" ], [ "Govindaraju", "Venu", "" ] ]
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1401.4490
Haig Atikian
Haig A. Atikian, Amin Eftekharian, A. Jafari Salim, Michael J. Burek, Jennifer T. Choy, A. Hamed Majedi and Marko Loncar
Superconducting Nanowire Single Photon Detector on Diamond
null
null
10.1063/1.4869574
null
physics.optics quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Superconducting nanowire single photon detectors (SNSPDs) are fabricated directly on diamond substrates and their optical and electrical properties are characterized. Dark count performance and photon count rates are measured at varying temperatures for 1310nm and 632nm photons. The procedure to prepare diamond substrate surfaces suitable for the deposition and patterning of thin film superconducting layers is reported. Using this approach, diamond substrates with less than 300pm RMS surface roughness are obtained.
[ { "created": "Fri, 17 Jan 2014 23:25:38 GMT", "version": "v1" } ]
2015-06-18
[ [ "Atikian", "Haig A.", "" ], [ "Eftekharian", "Amin", "" ], [ "Salim", "A. Jafari", "" ], [ "Burek", "Michael J.", "" ], [ "Choy", "Jennifer T.", "" ], [ "Majedi", "A. Hamed", "" ], [ "Loncar", "Marko", "" ] ]
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1401.4492
Michael Clarkson
Michael R. Clarkson and Bernd Finkbeiner and Masoud Koleini and Kristopher K. Micinski and Markus N. Rabe and C\'esar S\'anchez
Temporal Logics for Hyperproperties
null
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Two new logics for verification of hyperproperties are proposed. Hyperproperties characterize security policies, such as noninterference, as a property of sets of computation paths. Standard temporal logics such as LTL, CTL, and CTL* can refer only to a single path at a time, hence cannot express many hyperproperties of interest. The logics proposed here, HyperLTL and HyperCTL*, add explicit and simultaneous quantification over multiple paths to LTL and to CTL*. This kind of quantification enables expression of hyperproperties. A model checking algorithm for the proposed logics is given. For a fragment of HyperLTL, a prototype model checker has been implemented.
[ { "created": "Fri, 17 Jan 2014 23:38:50 GMT", "version": "v1" }, { "created": "Tue, 21 Jan 2014 04:59:36 GMT", "version": "v2" } ]
2014-01-22
[ [ "Clarkson", "Michael R.", "" ], [ "Finkbeiner", "Bernd", "" ], [ "Koleini", "Masoud", "" ], [ "Micinski", "Kristopher K.", "" ], [ "Rabe", "Markus N.", "" ], [ "Sánchez", "César", "" ] ]
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Temporal Logics for Hyperproperties
https://arxiv.org/abs/1401.4492v2
https://arxiv.org/pdf/1401.4492v2.pdf
https://github.com/kmicinski/htltl2mc
false
false
https://paperswithcode.com/paper/temporal-logics-for-hyperproperties
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1401.4493
Stuart Szigeti
Stuart S. Szigeti, Andre R. R. Carvalho, James G. Morley, Michael R. Hush
Ignorance is bliss: General and robust cancellation of decoherence via no-knowledge quantum feedback
6 pages + 2 pages supplemental material, 3 figures
S. S. Szigeti, A. R. R. Carvalho, J. G. Morley and M. R. Hush, Phys. Rev. Lett. 113, 020407 (2014)
10.1103/PhysRevLett.113.020407
null
quant-ph cond-mat.other physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A "no-knowledge" measurement of an open quantum system yields no information about any system observable; it only returns noise input from the environment. Surprisingly, performing such a no-knowledge measurement can be advantageous. We prove that a system undergoing no-knowledge monitoring has reversible noise, which can be cancelled by directly feeding back the measurement signal. We show how no-knowledge feedback control can be used to cancel decoherence in an arbitrary quantum system coupled to a Markovian reservoir that is being monitored. Since no-knowledge feedback does not depend on the system state or Hamiltonian, such decoherence cancellation is guaranteed to be general, robust and can operate in conjunction with any other quantum control protocol. As an application, we show that no-knowledge feedback could be used to improve the performance of dissipative quantum computers subjected to local loss.
[ { "created": "Fri, 17 Jan 2014 23:55:32 GMT", "version": "v1" }, { "created": "Wed, 14 May 2014 00:15:03 GMT", "version": "v2" }, { "created": "Fri, 11 Jul 2014 14:37:09 GMT", "version": "v3" } ]
2014-07-14
[ [ "Szigeti", "Stuart S.", "" ], [ "Carvalho", "Andre R. R.", "" ], [ "Morley", "James G.", "" ], [ "Hush", "Michael R.", "" ] ]
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1401.4499
Federico Echenique
Federico Echenique
Testing for separability is hard
null
null
null
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper shows that it is computationally hard to decide (or test) if a consumption data set is consistent with separable preferences.
[ { "created": "Sat, 18 Jan 2014 00:31:09 GMT", "version": "v1" } ]
2014-01-21
[ [ "Echenique", "Federico", "" ] ]
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1401.4501
J. M. Vaquero
J.M. Vaquero and M.C. Gallego
Reconstructing Past Solar Activity using Meridian Solar Observations: the Case of the Royal Observatory of the Spanish Navy (1833-1840)
14 pages, 4 figures, accepted for publication in Advances in Space Research
null
10.1016/j.asr.2014.01.015
null
astro-ph.SR physics.hist-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Solar meridian observations have been used to evaluate the solar activity of the past. Some important examples are the solar meridian observations made at the Basilica of San Petronio in Bologna by several astronomers and the observations made by Hevelius published in his book Machina Coelestis. However, we do not know whether these observations, which were not aimed to estimate the solar activity, are reliable for evaluating solar activity. In this paper, we present the marginal notes about sunspots that are included in the manuscripts of the meridian solar observations made at the Royal Observatory of the Spanish Navy during the period 1833-1840. We compare these observations with other solar activity indices such as sunspot area and number. Our conclusion is that solar meridian observations should be used with extreme caution to evaluate past solar activity.
[ { "created": "Sat, 18 Jan 2014 00:50:56 GMT", "version": "v1" } ]
2015-06-18
[ [ "Vaquero", "J. M.", "" ], [ "Gallego", "M. C.", "" ] ]
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1401.4505
Juan Song Dr.
Juan Song, Junyi Ye, Mengdi Qian, Fangfang Luo, Xian Li, Huadong Bian, Ye Dai, Guo-hong Ma, Qingxi Chen, Yan Jiang, Quanzhong Zhao, Jianrong Qiu
Self-organized Voids Revisited: Experimental Verification of the Formation Mechanism*
null
null
10.1088/1674-1056/23/7/077901
null
physics.optics
http://creativecommons.org/licenses/by-nc-sa/3.0/
In this paper, several experiments were conducted to further clarify the formation mechanism of self organized void array induced by a single laser beam, including energy-related experiments, refractive-index-contrast-related experiments, depth-related experiments and effective-numerical-aperture experiment. These experiments indicate that the interface spherical aberration is indeed responsible for the formation of void arrays.
[ { "created": "Sat, 18 Jan 2014 01:41:03 GMT", "version": "v1" } ]
2015-06-18
[ [ "Song", "Juan", "" ], [ "Ye", "Junyi", "" ], [ "Qian", "Mengdi", "" ], [ "Luo", "Fangfang", "" ], [ "Li", "Xian", "" ], [ "Bian", "Huadong", "" ], [ "Dai", "Ye", "" ], [ "Ma", "Guo-hong", "" ], [ "Chen", "Qingxi", "" ], [ "Jiang", "Yan", "" ], [ "Zhao", "Quanzhong", "" ], [ "Qiu", "Jianrong", "" ] ]
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1401.4506
Benjamin Belzer
Jiyang Yu, Michael Carosino, Krishnamoorthy Sivakumar, Benjamin J. Belzer, Yiming Chen
Detection and Decoding for 2D Magnetic Recording Channels with 2D Intersymbol Interference
8 pages, 11 figures, 1 table
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper considers iterative detection and decoding on the concatenated communication channel consisting of a two-dimensional magnetic recording (TDMR) channel modeled by the four-grain rectangular discrete grain model (DGM) proposed by Kavcic et. al., followed by a two-dimensional intersymbol interference (2D-ISI) channel modeled by linear convolution of the DGM model's output with a finite-extent 2D blurring mask followed by addition of white Gaussian noise. An iterative detection and decoding scheme combines TDMR detection, 2D-ISI detection, and soft-in/soft-out (SISO) channel decoding in a structure with two iteration loops. In the first loop, the 2D-ISI channel detector exchanges log-likelihood ratios (LLRs) with the TDMR detector. In the second loop, the TDMR detector exchanges LLRs with a serially concatenated convolutional code (SCCC) decoder. Simulation results for the concatenated TDMR and 2 x 2 averaging mask ISI channel with 10 dB SNR show that densities of 0.48 user bits per grain and above can be achieved, corresponding to an areal density of about 9.6 Terabits per square inch, over the entire range of grain probabilities in the TDMR model.
[ { "created": "Sat, 18 Jan 2014 01:44:03 GMT", "version": "v1" }, { "created": "Thu, 23 Jan 2014 05:05:32 GMT", "version": "v2" } ]
2014-01-24
[ [ "Yu", "Jiyang", "" ], [ "Carosino", "Michael", "" ], [ "Sivakumar", "Krishnamoorthy", "" ], [ "Belzer", "Benjamin J.", "" ], [ "Chen", "Yiming", "" ] ]
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1401.4509
Imad Ahmad
Imad Ahmad, Chih-Chun Wang
When and By How Much Can Helper Node Selection Improve Regenerating Codes?
35 pages, 10 figures, submitted to IEEE Transactions on Information Theory on September 04, 2014
null
10.1109/ALLERTON.2014.7028491
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Regenerating codes (RCs) can significantly reduce the repair-bandwidth of distributed storage networks. Initially, the analysis of RCs was based on the assumption that during the repair process, the newcomer does not distinguish (among all surviving nodes) which nodes to access, i.e., the newcomer is oblivious to the set of helpers being used. Such a scheme is termed the blind repair (BR) scheme. Nonetheless, it is intuitive in practice that the newcomer should choose to access only those "good" helpers. In this paper, a new characterization of the effect of choosing the helper nodes in terms of the storage-bandwidth tradeoff is given. Specifically, answers to the following fundamental questions are given: Under what conditions does proactively choosing the helper nodes improve the storage-bandwidth tradeoff? Can this improvement be analytically quantified? This paper answers the former question by providing a necessary and sufficient condition under which optimally choosing good helpers strictly improves the storage-bandwidth tradeoff. To answer the latter question, a low-complexity helper selection solution, termed the family repair (FR) scheme, is proposed and the corresponding storage/repair-bandwidth curve is characterized. For example, consider a distributed storage network with 60 total number of nodes and the network is resilient against 50 node failures. If the number of helper nodes is 10, then the FR scheme and its variant demonstrate 27% reduction in the repair-bandwidth when compared to the BR solution. This paper also proves that under some design parameters, the FR scheme is indeed optimal among all helper selection schemes. An explicit construction of an exact-repair code is also proposed that can achieve the minimum-bandwidth-regenerating point of the FR scheme. The new exact-repair code can be viewed as a generalization of the existing fractional repetition code.
[ { "created": "Sat, 18 Jan 2014 01:51:19 GMT", "version": "v1" }, { "created": "Fri, 5 Sep 2014 20:35:40 GMT", "version": "v2" } ]
2016-11-15
[ [ "Ahmad", "Imad", "" ], [ "Wang", "Chih-Chun", "" ] ]
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1401.4512
Rahul Jain
Rahul Jain, Troy Lee, Nisheeth K. Vishnoi
A quadratically tight partition bound for classical communication complexity and query complexity
8 pages, version 1
null
null
null
cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work we introduce, both for classical communication complexity and query complexity, a modification of the 'partition bound' introduced by Jain and Klauck [2010]. We call it the 'public-coin partition bound'. We show that (the logarithm to the base two of) its communication complexity and query complexity versions form, for all relations, a quadratically tight lower bound on the public-coin randomized communication complexity and randomized query complexity respectively.
[ { "created": "Sat, 18 Jan 2014 02:39:29 GMT", "version": "v1" } ]
2014-01-21
[ [ "Jain", "Rahul", "" ], [ "Lee", "Troy", "" ], [ "Vishnoi", "Nisheeth K.", "" ] ]
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1401.4516
Yanqing Wang
Yanqing Wang, Yu Jiang, Xiaolei Wang, Siyu Zhang, Yaowen Liang
Solving reviewer assignment problem in software peer review: An approach based on preference matrix and asymmetric TSP model
11 pages, 1 figure, 2 tables
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cs.DL math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Optimized reviewer assignment can effectively utilize limited intellectual resources and significantly assure review quality in various scenarios such as paper selection in conference or journal, proposal selection in funding agencies and so on. However, little research on reviewer assignment of software peer review has been found. In this study, an optimization approach is proposed based on students' preference matrix and the model of asymmetric traveling salesman problem (ATSP). Due to the most critical role of rule matrix in this approach, we conduct a questionnaire to obtain students' preference matrices and convert them to rule matrices. With the help of software ILOG CPLEX, the approach is accomplished by controlling the exit criterion of ATSP model. The comparative study shows that the assignment strategies with both reviewers' preference matrix and authors' preference matrix get better performance than the random assignment. Especially, it is found that the performance is just a little better than that of random assignment when the reviewers' and authors' preference matrices are merged. In other words, the majority of students have a strong wish of harmonious development even though high-level students are not willing to do that.
[ { "created": "Sat, 18 Jan 2014 04:46:36 GMT", "version": "v1" } ]
2014-01-21
[ [ "Wang", "Yanqing", "" ], [ "Jiang", "Yu", "" ], [ "Wang", "Xiaolei", "" ], [ "Zhang", "Siyu", "" ], [ "Liang", "Yaowen", "" ] ]
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1401.4518
Dolya Sergey N.
S. N. Dolya
Acceleration of magnetic dipoles by the sequence of current turns
7 pages, 1 figure
null
10.1134/S1063784214110085
2012126797
physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Acceleration of magnetic dipoles is carried out by the running gradient of the magnetic field formed while sequent switching on the current turns. Magnetic dipoles, with a diameter of sixty millimeters and full length one meter, are pre-accelerated by using the gas-dynamic method to speed one kilometer per second, corresponding to the injection rate into the main accelerator. To prevent the turning of the dipoles by one hundred eighty degrees in the field of the accelerating pulse and focus them, the magnetic dipoles are accelerated inside the titanium tube. The magnetic dipoles have mass two kilograms and acquire the finite speed five kilometers per second on the acceleration length three hundreds meters.
[ { "created": "Sat, 18 Jan 2014 06:40:05 GMT", "version": "v1" } ]
2015-06-18
[ [ "Dolya", "S. N.", "" ] ]
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1401.4519
Chuanfei Dong
Chuanfei Dong
Minor ion heating in spectra of linearly and circularly polarized Alfv\'{e}n waves: Thermal and non-thermal motions associated with perpendicular heating
Physics of Plasmas, in press
null
10.1063/1.4863833
null
astro-ph.SR physics.plasm-ph physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Minor ion (such as $He^{2+}$) heating via nonresonant interaction with spectra of linearly and circularly polarized Alfv\'{e}n waves (LPAWs and CPAWs hereafter) is studied. The obtained analytic solutions are in good agreement with the simulation results, indicating that newborn ions are heated by low-frequency Alfv\'{e}n waves with finite amplitude in low-beta plasmas such as the solar corona. The analytic solutions also reproduce the preferential heating of heavy ions in the solar wind. In the presence of parallel propagating Alfv\'{e}n waves, turbulence-induced particle motion is clearly observed in the wave (magnetic field) polarized directions. After the waves diminish, the newborn ions are heated, which is caused by the phase difference (randomization) between ions due to their different parallel thermal motions. The heating is dominant in the direction perpendicular to the ambient magnetic field. The perpendicular heating, $\eta=(T_{i\perp}^R-T_{i0\perp}^R)/T_{i0\perp}^R$ (where $T_{i0\perp}^R$ and $T_{i\perp}^R$ are the perpendicular temperature of species $i$ before and after genuine heating, respectively), in the spectrum of CPAWs is a factor of two stronger than that of LPAWs. Moreover, we also study the effect of field-aligned differential flow speed of species $i$ relative to $H^+$, $\delta v_{ip} = (\mathbf{v_i}-\mathbf{v_p}) \cdot \mathbf{B} / |\mathbf{B}|$ (where $\mathbf{v_i}$ and $\mathbf{v_p}$ denote vector velocities of the $H^+$ and species $i$, respectively), on the perpendicular heating. It reveals that large drift speed, $v_d=\delta v_{ip}$, has an effect on reducing the efficiency of perpendicular heating, which is consistent with observations.
[ { "created": "Sat, 18 Jan 2014 06:53:46 GMT", "version": "v1" } ]
2015-06-18
[ [ "Dong", "Chuanfei", "" ] ]
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1401.4528
Matthias W\"ahlisch
Di Li, Asya Mitseva
Mobile Adhoc Offloading
Published in: E. Baccelli, F. Juraschek, O. Hahm, T. C. Schmidt, H. Will, M. W\"ahlisch (Eds.), Proc. of 3rd MANIAC Challenge, Berlin, Germany, July 27 - 28, 2013, arXiv:1401.1163, Jan. 2014
null
null
MANIAC/2013/02
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This problem is a series of biddings and auctions. Each round of bidding and auction are different from previous ones because of the change of network topology, variance of budget set by the sender, and possible evolution of strategies of other nodes. The huge strategy space of relay nodes makes the formulation to a game very difficult. We present a brief qualitative analysis in this paper, and propose a bidding strategy based on learning algorithms.
[ { "created": "Sat, 18 Jan 2014 10:46:19 GMT", "version": "v1" } ]
2014-01-21
[ [ "Li", "Di", "" ], [ "Mitseva", "Asya", "" ] ]
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1401.4529
Bal\'azs Hidasi
Bal\'azs Hidasi, Domonkos Tikk
General factorization framework for context-aware recommendations
The final publication is available at Springer via http://dx.doi.org/10.1007/s10618-015-0417-y. Data Mining and Knowledge Discovery, 2015
null
10.1007/s10618-015-0417-y
null
cs.IR cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Context-aware recommendation algorithms focus on refining recommendations by considering additional information, available to the system. This topic has gained a lot of attention recently. Among others, several factorization methods were proposed to solve the problem, although most of them assume explicit feedback which strongly limits their real-world applicability. While these algorithms apply various loss functions and optimization strategies, the preference modeling under context is less explored due to the lack of tools allowing for easy experimentation with various models. As context dimensions are introduced beyond users and items, the space of possible preference models and the importance of proper modeling largely increases. In this paper we propose a General Factorization Framework (GFF), a single flexible algorithm that takes the preference model as an input and computes latent feature matrices for the input dimensions. GFF allows us to easily experiment with various linear models on any context-aware recommendation task, be it explicit or implicit feedback based. The scaling properties makes it usable under real life circumstances as well. We demonstrate the framework's potential by exploring various preference models on a 4-dimensional context-aware problem with contexts that are available for almost any real life datasets. We show in our experiments -- performed on five real life, implicit feedback datasets -- that proper preference modelling significantly increases recommendation accuracy, and previously unused models outperform the traditional ones. Novel models in GFF also outperform state-of-the-art factorization algorithms. We also extend the method to be fully compliant to the Multidimensional Dataspace Model, one of the most extensive data models of context-enriched data. Extended GFF allows the seamless incorporation of information into the fac[truncated]
[ { "created": "Sat, 18 Jan 2014 11:13:26 GMT", "version": "v1" }, { "created": "Tue, 19 May 2015 11:50:22 GMT", "version": "v2" } ]
2015-05-20
[ [ "Hidasi", "Balázs", "" ], [ "Tikk", "Domonkos", "" ] ]
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1401.4532
Yanfei Yan
Yanfei Yan, Ling Liu, Cong Ling
Polar Lattices for Strong Secrecy Over the Mod-$\Lambda$ Gaussian Wiretap Channel
7 pages, 2 figures, extended version of a paper submitted to ISIT'14
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Polar lattices, which are constructed from polar codes, are provably good for the additive white Gaussian noise (AWGN) channel. In this work, we propose a new polar lattice construction that achieves the secrecy capacity under the strong secrecy criterion over the mod-$\Lambda$ Gaussian wiretap channel. This construction leads to an AWGN-good lattice and a secrecy-good lattice simultaneously. The design methodology is mainly based on the equivalence in terms of polarization between the $\Lambda/\Lambda'$ channel in lattice coding and the equivalent channel derived from the chain rule of mutual information in multilevel coding.
[ { "created": "Sat, 18 Jan 2014 11:41:44 GMT", "version": "v1" }, { "created": "Fri, 24 Jan 2014 10:49:01 GMT", "version": "v2" } ]
2014-01-27
[ [ "Yan", "Yanfei", "" ], [ "Liu", "Ling", "" ], [ "Ling", "Cong", "" ] ]
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1401.4533
Wolfgang Stock
Agnes Mainka, Sarah Hartmann, Wolfgang G. Stock, and Isabella Peters
Government and Social Media: A Case Study of 31 Informational World Cities
In Proceedings of the 47th Hawaii International Conference on System Sciences (pp. 1715-1724). IEEE Computer Society, 2014
null
10.1109/HICSS.2014.219
null
cs.CY cs.DL cs.SI physics.soc-ph
http://creativecommons.org/licenses/by/3.0/
Social media platforms are increasingly being used by governments to foster user interaction. Particularly in cities with enhanced ICT infrastructures (i.e., Informational World Cities) and high internet penetration rates, social media platforms are valuable tools for reaching high numbers of citizens. This empirical investigation of 31 Informational World Cities will provide an overview of social media services used for governmental purposes, of their popularity among governments, and of their usage intensity in broadcasting information online.
[ { "created": "Sat, 18 Jan 2014 11:45:44 GMT", "version": "v1" }, { "created": "Fri, 28 Feb 2014 11:46:49 GMT", "version": "v2" } ]
2014-03-03
[ [ "Mainka", "Agnes", "" ], [ "Hartmann", "Sarah", "" ], [ "Stock", "Wolfgang G.", "" ], [ "Peters", "Isabella", "" ] ]
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1401.4534
Daniel Shanahan
Daniel Shanahan
A Case for Lorentzian Relativity
The version of this paper published in "Foundations of Physics" is available online through Springer's open access program at link.springer.com/article/10.1007%2Fs10701-013-9765-x. The present version corrects errors of transcription in Refs. [9] and [34], and in Eqn. (3) and the unnumbered equations immediately following Eqns. (3) and (12)
Found. Phys. 44, 349 (2014)
10.1007/s10701-013-9765-x
null
quant-ph physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Lorentz transformation (LT) is explained by changes occurring in the wave characteristics of matter as it changes inertial frame. This explanation is akin to that favoured by Lorentz, but informed by later insights, due primarily to de Broglie, regarding the underlying unity of matter and radiation. To show the nature of these changes, a massive particle is modelled as a standing wave in three dimensions. As the particle moves, the standing wave becomes a travelling wave having two factors. One is a carrier wave displaying the dilated frequency and contracted ellipsoidal form described by the LT, while the other (identified as the de Broglie wave) is a modulation defining the dephasing of the carrier wave (and thus the failure of simultaneity) in the direction of travel. The superluminality of the de Broglie wave is thus explained, as are several other mysterious features of the optical behaviour of matter, including the physical meaning of the Schr\"odinger Eqn. and the relevance to scattering processes of the de Broglie wave number. Consideration is given to what this Lorentzian approach to relativity might mean for the possible existence of a preferred frame and the origin of the observed Minkowski metric.
[ { "created": "Sat, 18 Jan 2014 12:31:23 GMT", "version": "v1" }, { "created": "Thu, 2 Oct 2014 12:04:26 GMT", "version": "v2" }, { "created": "Fri, 6 Mar 2015 04:42:56 GMT", "version": "v3" } ]
2015-03-09
[ [ "Shanahan", "Daniel", "" ] ]
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1401.4538
Jules Hedges
Jules Hedges
Dialectica models of additive-free linear logic
null
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a construction which transforms categorical models of additive-free propositional linear logic, closely based on de Paiva's dialectica categories and Oliva's functional interpretations of classical linear logic. The construction is defined using dependent type theory, which proves to be a useful tool for reasoning about dialectica categories. Abstractly, we have a closure operator on the class of models: it preserves soundness and completeness and has a monad-like structure. When applied to categories of games we obtain `games with bidding', which are hybrids of dialectica and game models, and we prove completeness theorems for two specific such models.
[ { "created": "Sat, 18 Jan 2014 13:09:08 GMT", "version": "v1" }, { "created": "Thu, 25 Sep 2014 09:35:40 GMT", "version": "v2" } ]
2014-09-26
[ [ "Hedges", "Jules", "" ] ]
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1401.4539
S.M. Ferdous
S.M. Ferdous, M. Sohel Rahman
Solving the Minimum Common String Partition Problem with the Help of Ants
null
null
null
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we consider the problem of finding a minimum common partition of two strings. The problem has its application in genome comparison. As it is an NP-hard, discrete combinatorial optimization problem, we employ a metaheuristic technique, namely, MAX-MIN ant system to solve this problem. To achieve better efficiency we first map the problem instance into a special kind of graph. Subsequently, we employ a MAX-MIN ant system to achieve high quality solutions for the problem. Experimental results show the superiority of our algorithm in comparison with the state of art algorithm in the literature. The improvement achieved is also justified by standard statistical test.
[ { "created": "Sat, 18 Jan 2014 13:15:30 GMT", "version": "v1" }, { "created": "Wed, 21 May 2014 06:35:41 GMT", "version": "v2" } ]
2015-06-22
[ [ "Ferdous", "S. M.", "" ], [ "Rahman", "M. Sohel", "" ] ]
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1401.4540
Marc Barthelemy
Thomas Louail, Maxime Lenormand, Oliva Garc\'ia Cant\'u, Miguel Picornell, Ricardo Herranz, Enrique Frias-Martinez, Jos\'e J. Ramasco, Marc Barthelemy
From mobile phone data to the spatial structure of cities
14 pages, 15 figures
Scientific Reports 4: 5276 (2014)
10.1038/srep05276
null
physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Pervasive infrastructures, such as cell phone networks, enable to capture large amounts of human behavioral data but also provide information about the structure of cities and their dynamical properties. In this article, we focus on these last aspects by studying phone data recorded during 55 days in 31 Spanish metropolitan areas. We first define an urban dilatation index which measures how the average distance between individuals evolves during the day, allowing us to highlight different types of city structure. We then focus on hotspots, the most crowded places in the city. We propose a parameter free method to detect them and to test the robustness of our results. The number of these hotspots scales sublinearly with the population size, a result in agreement with previous theoretical arguments and measures on employment datasets. We study the lifetime of these hotspots and show in particular that the hierarchy of permanent ones, which constitute the "heart" of the city, is very stable whatever the size of the city. The spatial structure of these hotspots is also of interest and allows us to distinguish different categories of cities, from monocentric and "segregated" where the spatial distribution is very dependent on land use, to polycentric where the spatial mixing between land uses is much more important. These results point towards the possibility of a new, quantitative classification of cities using high resolution spatio-temporal data.
[ { "created": "Sat, 18 Jan 2014 13:20:06 GMT", "version": "v1" } ]
2018-12-27
[ [ "Louail", "Thomas", "" ], [ "Lenormand", "Maxime", "" ], [ "Cantú", "Oliva García", "" ], [ "Picornell", "Miguel", "" ], [ "Herranz", "Ricardo", "" ], [ "Frias-Martinez", "Enrique", "" ], [ "Ramasco", "José J.", "" ], [ "Barthelemy", "Marc", "" ] ]
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1401.4543
Meriem Ben-Salah Akin
Meriem Ben-Salah Akin
On the Potential of Twitter for Understanding the Tunisia of the Post-Arab Spring
7 pages, 5 figures
null
null
null
cs.SI cs.CY physics.soc-ph
http://creativecommons.org/licenses/by-nc-sa/3.0/
Micro-blogging through Twitter has made information short and to the point, and more importantly systematically searchable. This work is the first of a series in which quotidian observations about Tunisia are obtained using the micro-blogging site Twitter. Data was extracted using the open source Twitter API v1.1. Specific tweets were obtained using functional search operators in particular thematic hash tags, geo-location, date, time and language. The presence of Tunisia in the international tweet stream, the language of communication of Tunisian residents through Twitter as well as Twitter usage across Tunisia are the center of attention of this article.
[ { "created": "Sat, 18 Jan 2014 14:13:58 GMT", "version": "v1" } ]
2014-01-21
[ [ "Akin", "Meriem Ben-Salah", "" ] ]
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1401.4550
Lorenzo Pareschi
Lorenzo Pareschi and Giuseppe Toscani
Wealth distribution and collective knowledge. A Boltzmann approach
21 pages, 10 figures. arXiv admin note: text overlap with arXiv:q-bio/0312018 by other authors
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10.1098/rsta.2013.0396
null
q-fin.GN physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce and discuss a nonlinear kinetic equation of Boltzmann type which describes the influence of knowledge in the evolution of wealth in a system of agents which interact through the binary trades introduced in Cordier, Pareschi, Toscani, J. Stat. Phys. 2005. The trades, which include both saving propensity and the risks of the market, are here modified in the risk and saving parameters, which now are assumed to depend on the personal degree of knowledge. The numerical simulations show that the presence of knowledge has the potential to produce a class of wealthy agents and to account for a larger proportion of wealth inequality.
[ { "created": "Sat, 18 Jan 2014 15:48:07 GMT", "version": "v1" } ]
2015-06-18
[ [ "Pareschi", "Lorenzo", "" ], [ "Toscani", "Giuseppe", "" ] ]
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1401.4555
Lorenzo Dominici dr
Giovanni Lerario, Alessandro Cannavale, Dario Ballarini, Lorenzo Dominici, Milena De Giorgi, Marco Liscidini, Dario Gerace, Daniele Sanvitto, Giuseppe Gigli
Room temperature Bloch surface wave polaritons
null
Optics Letters, 39, 2068-2071 (2014)
10.1364/OL.39.002068
null
cond-mat.mes-hall physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Polaritons are hybrid light-matter quasi-particles that have gathered a significant attention for their capability to show room temperature and out-of-equilibrium Bose-Einstein condensation. More recently, a novel class of ultrafast optical devices have been realized by using flows of polariton fluids, such as switches, interferometers and logical gates. However, polariton lifetimes and propagation distance are strongly limited by photon losses and accessible in-plane momenta in usual microcavity samples. In this work, we show experimental evidence of the formation of room temperature propagating polariton states arising from the strong coupling between organic excitons and a Bloch surface wave. This result, which was only recently predicted, paves the way for the realization of polariton devices that could allow lossless propagation up to macroscopic distances.
[ { "created": "Sat, 18 Jan 2014 16:01:50 GMT", "version": "v1" } ]
2014-08-07
[ [ "Lerario", "Giovanni", "" ], [ "Cannavale", "Alessandro", "" ], [ "Ballarini", "Dario", "" ], [ "Dominici", "Lorenzo", "" ], [ "De Giorgi", "Milena", "" ], [ "Liscidini", "Marco", "" ], [ "Gerace", "Dario", "" ], [ "Sanvitto", "Daniele", "" ], [ "Gigli", "Giuseppe", "" ] ]
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1401.4557
Colin Sheppard
Colin J. R. Sheppard, Shan Shan Kou and Jiao Lin
The Green-function transform and wave propagation
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null
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physics.optics physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Fourier methods well known in signal processing are applied to three-dimensional wave propagation problems. The Fourier transform of the Green function, when written explicitly in terms of a real-valued spatial frequency, consists of homogeneous and inhomogeneous components. Both parts are necessary to result in a pure out-going wave that satisfies causality. The homogeneous component consists only of propagating waves, but the inhomogeneous component contains both evanescent and propagating terms. Thus we make a distinction between inhomogenous waves and evanescent waves. The evanescent component is completely contained in the region of the inhomogeneous component outside the k-space sphere. Further, propagating waves in the Weyl expansion contain both homogeneous and inhomogeneous components. The connection between the Whittaker and Weyl expansions is discussed. A list of relevant spherically symmetric Fourier transforms is given.
[ { "created": "Sat, 18 Jan 2014 16:04:13 GMT", "version": "v1" } ]
2014-01-21
[ [ "Sheppard", "Colin J. R.", "" ], [ "Kou", "Shan Shan", "" ], [ "Lin", "Jiao", "" ] ]
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1401.4561
Krystyna Lukierska-Walasek
K. Lukierska-Walasek, K. Topolski, K.Trojanowski
Hyperbolic statistics and entropy loss in the description of gene distributions
3 pages, 3 figures, improved presentation of figures and conclusions somewhat changed
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physics.bio-ph physics.data-an q-bio.QM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Zipf's law implies the statistical distributions of hyperbolic type, which can describe the properties of stability and entropy loss in linguistics. We present the information theory from which follows that if the system is described by distributions of hyperbolic type it leads to the possibility of entropy loss. We present the number of repetitions of genes in tne genomes for some bacteria, as Borelia burgdorferi and Escherichia coli. Distributions of repetitions of genes in genome appears to be represented by distributions of hyperbolic type.
[ { "created": "Sat, 18 Jan 2014 16:40:49 GMT", "version": "v1" }, { "created": "Fri, 28 Mar 2014 14:46:54 GMT", "version": "v2" } ]
2014-03-31
[ [ "Lukierska-Walasek", "K.", "" ], [ "Topolski", "K.", "" ], [ "Trojanowski", "K.", "" ] ]
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1401.4566
Mehrdad Mahdavi
Mehrdad Mahdavi and Rong Jin
Excess Risk Bounds for Exponentially Concave Losses
null
null
null
null
cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The overarching goal of this paper is to derive excess risk bounds for learning from exp-concave loss functions in passive and sequential learning settings. Exp-concave loss functions encompass several fundamental problems in machine learning such as squared loss in linear regression, logistic loss in classification, and negative logarithm loss in portfolio management. In batch setting, we obtain sharp bounds on the performance of empirical risk minimization performed in a linear hypothesis space and with respect to the exp-concave loss functions. We also extend the results to the online setting where the learner receives the training examples in a sequential manner. We propose an online learning algorithm that is a properly modified version of online Newton method to obtain sharp risk bounds. Under an additional mild assumption on the loss function, we show that in both settings we are able to achieve an excess risk bound of $O(d\log n/n)$ that holds with a high probability.
[ { "created": "Sat, 18 Jan 2014 17:07:38 GMT", "version": "v1" }, { "created": "Sat, 8 Feb 2014 05:02:49 GMT", "version": "v2" } ]
2014-02-11
[ [ "Mahdavi", "Mehrdad", "" ], [ "Jin", "Rong", "" ] ]
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1401.4567
Jean-Guillaume Dumas
Jean-Guillaume Dumas (CASYS), Erich Kaltofen
Essentially optimal interactive certificates in linear algebra
null
ACM International Symposium on Symbolic and Algebraic Computation (ISSAC 2014), Jul 2014, Kobe, Japan. pp.146-153
10.1145/2608628.2608644
null
cs.SC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Certificates to a linear algebra computation are additional data structures for each output, which can be used by a---possibly randomized---verification algorithm that proves the correctness of each output. The certificates are essentially optimal if the time (and space) complexity of verification is essentially linear in the input size $N$, meaning $N$ times a factor $N^{o(1)}$, i.e., a factor $N^{\eta(N)}$ with $\lim\_{N\to \infty} \eta(N)$ $=$ $0$. We give algorithms that compute essentially optimal certificates for the positive semidefiniteness, Frobenius form, characteristic and minimal polynomial of an $n\times n$ dense integer matrix $A$. Our certificates can be verified in Monte-Carlo bit complexity $(n^2 \log\|A\|)^{1+o(1)}$, where $\log\|A\|$ is the bit size of the integer entries, solving an open problem in [Kaltofen, Nehring, Saunders, Proc.\ ISSAC 2011] subject to computational hardness assumptions. Second, we give algorithms that compute certificates for the rank of sparse or structured $n\times n$ matrices over an abstract field, whose Monte Carlo verification complexity is $2$ matrix-times-vector products $+$ $n^{1+o(1)}$ arithmetic operations in the field. For example, if the $n\times n$ input matrix is sparse with $n^{1+o(1)}$ non-zero entries, our rank certificate can be verified in $n^{1+o(1)}$ field operations. This extends also to integer matrices with only an extra $\|A\|^{1+o(1)}$ factor. All our certificates are based on interactive verification protocols with the interaction removed by a Fiat-Shamir identification heuristic. The validity of our verification procedure is subject to standard computational hardness assumptions from cryptography.
[ { "created": "Sat, 18 Jan 2014 17:08:05 GMT", "version": "v1" }, { "created": "Sat, 26 Apr 2014 14:27:29 GMT", "version": "v2" }, { "created": "Mon, 23 Dec 2019 13:30:54 GMT", "version": "v3" }, { "created": "Wed, 8 Jan 2020 10:58:48 GMT", "version": "v4" } ]
2020-01-09
[ [ "Dumas", "Jean-Guillaume", "", "CASYS" ], [ "Kaltofen", "Erich", "" ] ]
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1401.4568
Petru Valicov
Julien Bensmail (LaBRI), Ararat Harutyunyan (MI), Herv\'e Hocquard (LaBRI), Petru Valicov (LIP)
Strong edge-colouring of sparse planar graphs
null
null
null
null
cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A strong edge-colouring of a graph is a proper edge-colouring where each colour class induces a matching. It is known that every planar graph with maximum degree $\Delta$ has a strong edge-colouring with at most $4\Delta+4$ colours. We show that $3\Delta+1$ colours suffice if the graph has girth 6, and $4\Delta$ colours suffice if $\Delta\geq 7$ or the girth is at least 5. In the last part of the paper, we raise some questions related to a long-standing conjecture of Vizing on proper edge-colouring of planar graphs.
[ { "created": "Sat, 18 Jan 2014 17:11:56 GMT", "version": "v1" }, { "created": "Wed, 22 Jan 2014 13:21:02 GMT", "version": "v2" }, { "created": "Mon, 21 Jul 2014 16:32:19 GMT", "version": "v3" } ]
2014-07-22
[ [ "Bensmail", "Julien", "", "LaBRI" ], [ "Harutyunyan", "Ararat", "", "MI" ], [ "Hocquard", "Hervé", "", "LaBRI" ], [ "Valicov", "Petru", "", "LIP" ] ]
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1401.4570
Andree-Aimee Toucas
Jean Geringer (DdO, CIS-ENSMSE, LGF-ENSMSE, STBio-ENSMSE, IFRESIS-ENSMSE), Mathew L. Taylor (DMSE), Digby D. Macdonald (DMSE)
Predicting the steady state thickness of passive films in order to prevent degradations of implant
null
ICMCTF 2013 (International Conference on Metallurgical Coatings and Thin Films), San Diego : United States (2013)
null
null
physics.med-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Some implants have approximately a lifetime of 15 years. The femoral stem, for example, should be made of 316L/316LN stainless steel. Fretting corrosion, friction under small displacements, should occur during human gait, due to repeated loadings and un-loadings, between stainless steel and bone for instance. Some experimental investigations of fretting corrosion have been practiced. As well known, metallic alloys and especially stainless steels are covered with a passive film that prevents from the corrosion and degradation. This passive layer of few nanometers, at ambient temperature, is the key of our civilization according to some authors. This work is dedicated to predict the passive layer thicknesses of stainless steel under fretting corrosion with a specific emphasis on the role of proteins. The model is based on the Point Defect Model (micro scale) and an update of the model on the friction process (micro-macro scale). Genetic algorithm was used for finding solution of the problem. The major results are, as expected from experimental results, albumin prevents from degradation at the lowest concentration of chlorides; an incubation time is necessary for degrading the passive film; under fretting corrosion and high concentration of chlorides the passive behavior is annihilated.
[ { "created": "Sat, 18 Jan 2014 17:13:33 GMT", "version": "v1" } ]
2014-01-21
[ [ "Geringer", "Jean", "", "DdO, CIS-ENSMSE, LGF-ENSMSE, STBio-ENSMSE,\n IFRESIS-ENSMSE" ], [ "Taylor", "Mathew L.", "", "DMSE" ], [ "Macdonald", "Digby D.", "", "DMSE" ] ]
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1401.4575
Tobias Lutz
Tobias Lutz
Various Views on the Trapdoor Channel and an Upper Bound on its Capacity
A mistake in the notation section was corrected. The correct definition of matrix $\tilde{I}_n$ is: $\tilde{I}_n$ is a $2^n \times 2^n$ matrix whose secondary diagonal entries are all equal to 1 while the remaining entries are all equal to 0
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Two novel views are presented on the trapdoor channel. First, by deriving the underlying iterated function system (IFS), it is shown that the trapdoor channel with input blocks of length $n$ can be regarded as the $n$th element of a sequence of shapes approximating a fractal. Second, an algorithm is presented that fully characterizes the trapdoor channel and resembles the recursion of generating all permutations of a given string. Subsequently, the problem of maximizing a $n$-letter mutual information is considered. It is shown that $\frac{1}{2}\log_2\left(\frac{5}{2}\right)\approx 0.6610$ bits per use is an upper bound on the capacity of the trapdoor channel. This upper bound, which is the tightest upper bound known proves that feedback increases capacity of the trapdoor channel.
[ { "created": "Sat, 18 Jan 2014 18:16:19 GMT", "version": "v1" }, { "created": "Thu, 6 Feb 2014 18:36:18 GMT", "version": "v2" } ]
2014-02-07
[ [ "Lutz", "Tobias", "" ] ]
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1401.4578
Vito Domenico Pietro Servedio
Saverio Caminiti, Claudio Cicali, Pietro Gravino, Vittorio Loreto, Vito D.P. Servedio, Alina S\^irbu and Francesca Tria
XTribe: a web-based social computation platform
11 pages, 2 figures, 1 table, 2013 Third International Conference on Cloud and Green Computing (CGC), Sept. 30 2013-Oct. 2 2013, Karlsruhe, Germany
IEEE Xplore, Cloud and Green Computing (CGC), 2013 Third International Conference on, 397-403 (2013)
10.1109/CGC.2013.69
null
cs.CY cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the last few years the Web has progressively acquired the status of an infrastructure for social computation that allows researchers to coordinate the cognitive abilities of human agents in on-line communities so to steer the collective user activity towards predefined goals. This general trend is also triggering the adoption of web-games as a very interesting laboratory to run experiments in the social sciences and whenever the contribution of human beings is crucially required for research purposes. Nowadays, while the number of on-line users has been steadily growing, there is still a need of systematization in the approach to the web as a laboratory. In this paper we present Experimental Tribe (XTribe in short), a novel general purpose web-based platform for web-gaming and social computation. Ready to use and already operational, XTribe aims at drastically reducing the effort required to develop and run web experiments. XTribe has been designed to speed up the implementation of those general aspects of web experiments that are independent of the specific experiment content. For example, XTribe takes care of user management by handling their registration and profiles and in case of multi-player games, it provides the necessary user grouping functionalities. XTribe also provides communication facilities to easily achieve both bidirectional and asynchronous communication. From a practical point of view, researchers are left with the only task of designing and implementing the game interface and logic of their experiment, on which they maintain full control. Moreover, XTribe acts as a repository of different scientific experiments, thus realizing a sort of showcase that stimulates users' curiosity, enhances their participation, and helps researchers in recruiting volunteers.
[ { "created": "Sat, 18 Jan 2014 18:35:34 GMT", "version": "v1" } ]
2014-01-21
[ [ "Caminiti", "Saverio", "" ], [ "Cicali", "Claudio", "" ], [ "Gravino", "Pietro", "" ], [ "Loreto", "Vittorio", "" ], [ "Servedio", "Vito D. P.", "" ], [ "Sîrbu", "Alina", "" ], [ "Tria", "Francesca", "" ] ]
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1401.4580
Piet Van Mieghem
Piet Van Mieghem
Graph eigenvectors, fundamental weights and centrality metrics for nodes in networks
New results are included. The appendices contain supplementary material. All comments are welcome!
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null
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math.SP cond-mat.stat-mech cs.DM cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Several expressions for the $j$-th component $\left( x_{k}\right)_{j}$ of the $k$-th eigenvector $x_{k}$ of a symmetric matrix $A$ belonging to eigenvalue $\lambda_{k}$ and normalized as $x_{k}^{T}x_{k}=1$ are presented. In particular, the expression \[ \left( x_{k}\right)_{j}^{2}=-\frac{1}{c_{A}^{\prime}\left( \lambda_{k}\right) }\det\left( A_{\backslash\left\{ j\right\} }-\lambda_{k}I\right) \] where $c_{A}\left( \lambda\right) =\det\left( A-\lambda I\right) $ is the characteristic polynomial of $A$, $c_{A}^{\prime}\left( \lambda\right) =\frac{dc_{A}\left( \lambda\right) }{d\lambda}$ and $A_{\backslash\left\{ j\right\} }$ is obtained from $A$ by removal of row $j$ and column $j$, suggests us to consider the square eigenvector component as a graph centrality metric for node $j$ that reflects the impact of the removal of node $j$ from the graph at an eigenfrequency/eigenvalue $\lambda_{k}$ of a graph related matrix (such as the adjacency or Laplacian matrix). Removal of nodes in a graph relates to the robustness of a graph. The set of such nodal centrality metrics, the squared eigenvector components $\left( x_{k}\right)_{j}^{2}$ of the adjacency matrix over all eigenvalue $\lambda_{k}$ for each node $j$, is 'ideal' in the sense of being complete, \emph{almost} uncorrelated and mathematically precisely defined and computable. Fundamental weights (column sum of $X$) and dual fundamental weights (row sum of $X$) are introduced as spectral metrics that condense information embedded in the orthogonal eigenvector matrix $X$, with elements $X_{ij}=\left( x_{j}\right)_{i}$. In addition to the criterion {\em If the algebraic connectivity is positive, then the graph is connected}, we found an alternative condition: {\em If $\min_{1\leq k\leq N}\left( \lambda_{k}^{2}(A)\right) =d_{\min}$, then the graph is disconnected.}
[ { "created": "Sat, 18 Jan 2014 19:05:56 GMT", "version": "v1" }, { "created": "Fri, 12 Dec 2014 09:40:21 GMT", "version": "v2" }, { "created": "Sat, 8 Aug 2015 18:58:39 GMT", "version": "v3" }, { "created": "Mon, 14 Mar 2016 16:11:01 GMT", "version": "v4" } ]
2016-03-15
[ [ "Van Mieghem", "Piet", "" ] ]
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1401.4582
David Birch
David Birch, Helen Liang, Paul H J Kelly, Glen Mullineux, Tony Field, Joan Ko, Alvise Simondetti
Multidisciplinary Engineering Models: Methodology and Case Study in Spreadsheet Analytics
12 Pages, 8 Colour figures
Proc. European Spreadsheet Risks Int. Grp. (EuSpRIG) 2013, ISBN: 978-1-9054045-1-3
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper demonstrates a methodology to help practitioners maximise the utility of complex multidisciplinary engineering models implemented as spreadsheets, an area presenting unique challenges. As motivation we investigate the expanding use of Integrated Resource Management(IRM) models which assess the sustainability of urban masterplan designs. IRM models reflect the inherent complexity of multidisciplinary sustainability analysis by integrating models from many disciplines. This complexity makes their use time-consuming and reduces their adoption. We present a methodology and toolkit for analysing multidisciplinary engineering models implemented as spreadsheets to alleviate such problems and increase their adoption. For a given output a relevant slice of the model is extracted, visualised and analysed by computing model and interdisciplinary metrics. A sensitivity analysis of the extracted model supports engineers in their optimisation efforts. These methods expose, manage and reduce model complexity and risk whilst giving practitioners insight into multidisciplinary model composition. We report application of the methodology to several generations of an industrial IRM model and detail the insight generated, particularly considering model evolution.
[ { "created": "Sat, 18 Jan 2014 19:25:43 GMT", "version": "v1" } ]
2014-01-21
[ [ "Birch", "David", "" ], [ "Liang", "Helen", "" ], [ "Kelly", "Paul H J", "" ], [ "Mullineux", "Glen", "" ], [ "Field", "Tony", "" ], [ "Ko", "Joan", "" ], [ "Simondetti", "Alvise", "" ] ]
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1401.4587
Rafayel Mirzoyan
A. Sargsyan, A. Tonoyan, G. Hakhumyan, A. Papoyan, E. Mariotti, D. Sarkisyan
Giant modification of atomic transitions probabilities induced by magnetic field: forbidden transitions become predominant
7 pages, 8 figures
null
10.1088/1612-2011/11/5/055701
null
physics.atom-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Magnetic field-induced giant modification of probabilities for seven components of 6S1/2 (Fg=3) - 6P3/2 (Fe=5) transition of Cs D2 line forbidden by selection rules is observed experimentally for the first time. For the case of excitation with circularly-polarized laser radiation, the probability of Fg=3,mF=-3 - Fe=5,mF=-2 transition becomes the largest among 25 transitions of Fg=3 - Fe=2,3,4,5 group in a wide range of magnetic field 200 - 3200 G. Moreover, the modification is the largest among D2 lines of alkali metals. A half-wave-thick cell (length along the beam propagation axis L=426 nm) filled with Cs has been used in order to achieve sub-Doppler resolution which allows for separating the large number of atomic transitions that appear in the absorption spectrum when an external magnetic field is applied. For B > 3 kG the group of seven transitions Fg=3 - Fe=5 is completely resolved and is located at the high frequency wing of Fg=3 - Fe=2,3,4 transitions. The applied theoretical model very well describes the experimental curves.
[ { "created": "Sat, 18 Jan 2014 20:44:19 GMT", "version": "v1" } ]
2015-06-18
[ [ "Sargsyan", "A.", "" ], [ "Tonoyan", "A.", "" ], [ "Hakhumyan", "G.", "" ], [ "Papoyan", "A.", "" ], [ "Mariotti", "E.", "" ], [ "Sarkisyan", "D.", "" ] ]
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1401.4589
Rania Ibrahim
Rania Ibrahim, Noha A. Yousri, Mohamed A. Ismail, Nagwa M. El-Makky
miRNA and Gene Expression based Cancer Classification using Self- Learning and Co-Training Approaches
8 pages, 4 figures, 10 tables, conference
null
null
null
cs.CE cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
miRNA and gene expression profiles have been proved useful for classifying cancer samples. Efficient classifiers have been recently sought and developed. A number of attempts to classify cancer samples using miRNA/gene expression profiles are known in literature. However, the use of semi-supervised learning models have been used recently in bioinformatics, to exploit the huge corpuses of publicly available sets. Using both labeled and unlabeled sets to train sample classifiers, have not been previously considered when gene and miRNA expression sets are used. Moreover, there is a motivation to integrate both miRNA and gene expression for a semi-supervised cancer classification as that provides more information on the characteristics of cancer samples. In this paper, two semi-supervised machine learning approaches, namely self-learning and co-training, are adapted to enhance the quality of cancer sample classification. These approaches exploit the huge public corpuses to enrich the training data. In self-learning, miRNA and gene based classifiers are enhanced independently. While in co-training, both miRNA and gene expression profiles are used simultaneously to provide different views of cancer samples. To our knowledge, it is the first attempt to apply these learning approaches to cancer classification. The approaches were evaluated using breast cancer, hepatocellular carcinoma (HCC) and lung cancer expression sets. Results show up to 20% improvement in F1-measure over Random Forests and SVM classifiers. Co-Training also outperforms Low Density Separation (LDS) approach by around 25% improvement in F1-measure in breast cancer.
[ { "created": "Sat, 18 Jan 2014 21:02:32 GMT", "version": "v1" } ]
2014-01-21
[ [ "Ibrahim", "Rania", "" ], [ "Yousri", "Noha A.", "" ], [ "Ismail", "Mohamed A.", "" ], [ "El-Makky", "Nagwa M.", "" ] ]
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1401.4590
Enrique Amig\'o
Enrique Amig\'o, Julio Gonzalo, Javier Artiles, Felisa Verdejo
Combining Evaluation Metrics via the Unanimous Improvement Ratio and its Application to Clustering Tasks
null
Journal Of Artificial Intelligence Research, Volume 42, pages 689-718, 2011
10.1613/jair.3401
null
cs.AI cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Many Artificial Intelligence tasks cannot be evaluated with a single quality criterion and some sort of weighted combination is needed to provide system rankings. A problem of weighted combination measures is that slight changes in the relative weights may produce substantial changes in the system rankings. This paper introduces the Unanimous Improvement Ratio (UIR), a measure that complements standard metric combination criteria (such as van Rijsbergen's F-measure) and indicates how robust the measured differences are to changes in the relative weights of the individual metrics. UIR is meant to elucidate whether a perceived difference between two systems is an artifact of how individual metrics are weighted. Besides discussing the theoretical foundations of UIR, this paper presents empirical results that confirm the validity and usefulness of the metric for the Text Clustering problem, where there is a tradeoff between precision and recall based metrics and results are particularly sensitive to the weighting scheme used to combine them. Remarkably, our experiments show that UIR can be used as a predictor of how well differences between systems measured on a given test bed will also hold in a different test bed.
[ { "created": "Sat, 18 Jan 2014 21:03:23 GMT", "version": "v1" } ]
2014-01-21
[ [ "Amigó", "Enrique", "" ], [ "Gonzalo", "Julio", "" ], [ "Artiles", "Javier", "" ], [ "Verdejo", "Felisa", "" ] ]
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1401.4591
Marc Ponsen
Marc Ponsen, Steven de Jong, Marc Lanctot
Computing Approximate Nash Equilibria and Robust Best-Responses Using Sampling
null
Journal Of Artificial Intelligence Research, Volume 42, pages 575-605, 2011
10.1613/jair.3402
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This article discusses two contributions to decision-making in complex partially observable stochastic games. First, we apply two state-of-the-art search techniques that use Monte-Carlo sampling to the task of approximating a Nash-Equilibrium (NE) in such games, namely Monte-Carlo Tree Search (MCTS) and Monte-Carlo Counterfactual Regret Minimization (MCCFR). MCTS has been proven to approximate a NE in perfect-information games. We show that the algorithm quickly finds a reasonably strong strategy (but not a NE) in a complex imperfect information game, i.e. Poker. MCCFR on the other hand has theoretical NE convergence guarantees in such a game. We apply MCCFR for the first time in Poker. Based on our experiments, we may conclude that MCTS is a valid approach if one wants to learn reasonably strong strategies fast, whereas MCCFR is the better choice if the quality of the strategy is most important. Our second contribution relates to the observation that a NE is not a best response against players that are not playing a NE. We present Monte-Carlo Restricted Nash Response (MCRNR), a sample-based algorithm for the computation of restricted Nash strategies. These are robust best-response strategies that (1) exploit non-NE opponents more than playing a NE and (2) are not (overly) exploitable by other strategies. We combine the advantages of two state-of-the-art algorithms, i.e. MCCFR and Restricted Nash Response (RNR). MCRNR samples only relevant parts of the game tree. We show that MCRNR learns quicker than standard RNR in smaller games. Also we show in Poker that MCRNR learns robust best-response strategies fast, and that these strategies exploit opponents more than playing a NE does.
[ { "created": "Sat, 18 Jan 2014 21:03:42 GMT", "version": "v1" } ]
2014-01-21
[ [ "Ponsen", "Marc", "" ], [ "de Jong", "Steven", "" ], [ "Lanctot", "Marc", "" ] ]
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Computing Approximate Nash Equilibria and Robust Best-Responses Using Sampling
https://arxiv.org/abs/1401.4591v1
https://arxiv.org/pdf/1401.4591v1.pdf
https://github.com/andrewgenesis/PythonHUSNGPokerBot
false
false
https://paperswithcode.com/paper/computing-approximate-nash-equilibria-and
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1401.4592
Jiri Baum
Jiri Baum, Ann E. Nicholson, Trevor I. Dix
Proximity-Based Non-uniform Abstractions for Approximate Planning
null
Journal Of Artificial Intelligence Research, Volume 43, pages 477-522, 2012
10.1613/jair.3414
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In a deterministic world, a planning agent can be certain of the consequences of its planned sequence of actions. Not so, however, in dynamic, stochastic domains where Markov decision processes are commonly used. Unfortunately these suffer from the curse of dimensionality: if the state space is a Cartesian product of many small sets (dimensions), planning is exponential in the number of those dimensions. Our new technique exploits the intuitive strategy of selectively ignoring various dimensions in different parts of the state space. The resulting non-uniformity has strong implications, since the approximation is no longer Markovian, requiring the use of a modified planner. We also use a spatial and temporal proximity measure, which responds to continued planning as well as movement of the agent through the state space, to dynamically adapt the abstraction as planning progresses. We present qualitative and quantitative results across a range of experimental domains showing that an agent exploiting this novel approximation method successfully finds solutions to the planning problem using much less than the full state space. We assess and analyse the features of domains which our method can exploit.
[ { "created": "Sat, 18 Jan 2014 21:03:58 GMT", "version": "v1" } ]
2014-01-21
[ [ "Baum", "Jiri", "" ], [ "Nicholson", "Ann E.", "" ], [ "Dix", "Trevor I.", "" ] ]
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1401.4593
Adam Sadilek
Adam Sadilek, Henry Kautz
Location-Based Reasoning about Complex Multi-Agent Behavior
null
Journal Of Artificial Intelligence Research, Volume 43, pages 87-133, 2012
10.1613/jair.3421
null
cs.MA cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent research has shown that surprisingly rich models of human activity can be learned from GPS (positional) data. However, most effort to date has concentrated on modeling single individuals or statistical properties of groups of people. Moreover, prior work focused solely on modeling actual successful executions (and not failed or attempted executions) of the activities of interest. We, in contrast, take on the task of understanding human interactions, attempted interactions, and intentions from noisy sensor data in a fully relational multi-agent setting. We use a real-world game of capture the flag to illustrate our approach in a well-defined domain that involves many distinct cooperative and competitive joint activities. We model the domain using Markov logic, a statistical-relational language, and learn a theory that jointly denoises the data and infers occurrences of high-level activities, such as a player capturing an enemy. Our unified model combines constraints imposed by the geometry of the game area, the motion model of the players, and by the rules and dynamics of the game in a probabilistically and logically sound fashion. We show that while it may be impossible to directly detect a multi-agent activity due to sensor noise or malfunction, the occurrence of the activity can still be inferred by considering both its impact on the future behaviors of the people involved as well as the events that could have preceded it. Further, we show that given a model of successfully performed multi-agent activities, along with a set of examples of failed attempts at the same activities, our system automatically learns an augmented model that is capable of recognizing success and failure, as well as goals of peoples actions with high accuracy. We compare our approach with other alternatives and show that our unified model, which takes into account not only relationships among individual players, but also relationships among activities over the entire length of a game, although more computationally costly, is significantly more accurate. Finally, we demonstrate that explicitly modeling unsuccessful attempts boosts performance on other important recognition tasks.
[ { "created": "Sat, 18 Jan 2014 21:04:39 GMT", "version": "v1" } ]
2014-01-21
[ [ "Sadilek", "Adam", "" ], [ "Kautz", "Henry", "" ] ]
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1401.4595
Na Fu
Na Fu, Hoong Chuin Lau, Pradeep R. Varakantham, Fei Xiao
Robust Local Search for Solving RCPSP/max with Durational Uncertainty
null
Journal Of Artificial Intelligence Research, Volume 43, pages 43-86, 2012
10.1613/jair.3424
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Scheduling problems in manufacturing, logistics and project management have frequently been modeled using the framework of Resource Constrained Project Scheduling Problems with minimum and maximum time lags (RCPSP/max). Due to the importance of these problems, providing scalable solution schedules for RCPSP/max problems is a topic of extensive research. However, all existing methods for solving RCPSP/max assume that durations of activities are known with certainty, an assumption that does not hold in real world scheduling problems where unexpected external events such as manpower availability, weather changes, etc. lead to delays or advances in completion of activities. Thus, in this paper, our focus is on providing a scalable method for solving RCPSP/max problems with durational uncertainty. To that end, we introduce the robust local search method consisting of three key ideas: (a) Introducing and studying the properties of two decision rule approximations used to compute start times of activities with respect to dynamic realizations of the durational uncertainty; (b) Deriving the expression for robust makespan of an execution strategy based on decision rule approximations; and (c) A robust local search mechanism to efficiently compute activity execution strategies that are robust against durational uncertainty. Furthermore, we also provide enhancements to local search that exploit temporal dependencies between activities. Our experimental results illustrate that robust local search is able to provide robust execution strategies efficiently.
[ { "created": "Sat, 18 Jan 2014 21:04:55 GMT", "version": "v1" } ]
2014-01-21
[ [ "Fu", "Na", "" ], [ "Lau", "Hoong Chuin", "" ], [ "Varakantham", "Pradeep R.", "" ], [ "Xiao", "Fei", "" ] ]
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1401.4596
Mario Alviano
Mario Alviano, Francesco Calimeri, Wolfgang Faber, Nicola Leone, Simona Perri
Unfounded Sets and Well-Founded Semantics of Answer Set Programs with Aggregates
null
Journal Of Artificial Intelligence Research, Volume 42, pages 487-527, 2011
10.1613/jair.3432
null
cs.LO cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Logic programs with aggregates (LPA) are one of the major linguistic extensions to Logic Programming (LP). In this work, we propose a generalization of the notions of unfounded set and well-founded semantics for programs with monotone and antimonotone aggregates (LPAma programs). In particular, we present a new notion of unfounded set for LPAma programs, which is a sound generalization of the original definition for standard (aggregate-free) LP. On this basis, we define a well-founded operator for LPAma programs, the fixpoint of which is called well-founded model (or well-founded semantics) for LPAma programs. The most important properties of unfounded sets and the well-founded semantics for standard LP are retained by this generalization, notably existence and uniqueness of the well-founded model, together with a strong relationship to the answer set semantics for LPAma programs. We show that one of the D-well-founded semantics, defined by Pelov, Denecker, and Bruynooghe for a broader class of aggregates using approximating operators, coincides with the well-founded model as defined in this work on LPAma programs. We also discuss some complexity issues, most importantly we give a formal proof of tractable computation of the well-founded model for LPA programs. Moreover, we prove that for general LPA programs, which may contain aggregates that are neither monotone nor antimonotone, deciding satisfaction of aggregate expressions with respect to partial interpretations is coNP-complete. As a consequence, a well-founded semantics for general LPA programs that allows for tractable computation is unlikely to exist, which justifies the restriction on LPAma programs. Finally, we present a prototype system extending DLV, which supports the well-founded semantics for LPAma programs, at the time of writing the only implemented system that does so. Experiments with this prototype show significant computational advantages of aggregate constructs over equivalent aggregate-free encodings.
[ { "created": "Sat, 18 Jan 2014 21:05:13 GMT", "version": "v1" } ]
2014-01-21
[ [ "Alviano", "Mario", "" ], [ "Calimeri", "Francesco", "" ], [ "Faber", "Wolfgang", "" ], [ "Leone", "Nicola", "" ], [ "Perri", "Simona", "" ] ]
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1401.4597
Matthew L. Ginsberg
Matthew L. Ginsberg
Dr.Fill: Crosswords and an Implemented Solver for Singly Weighted CSPs
null
Journal Of Artificial Intelligence Research, Volume 42, pages 851-886, 2011
10.1613/jair.3437
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe Dr.Fill, a program that solves American-style crossword puzzles. From a technical perspective, Dr.Fill works by converting crosswords to weighted CSPs, and then using a variety of novel techniques to find a solution. These techniques include generally applicable heuristics for variable and value selection, a variant of limited discrepancy search, and postprocessing and partitioning ideas. Branch and bound is not used, as it was incompatible with postprocessing and was determined experimentally to be of little practical value. Dr.Fillls performance on crosswords from the American Crossword Puzzle Tournament suggests that it ranks among the top fifty or so crossword solvers in the world.
[ { "created": "Sat, 18 Jan 2014 21:05:30 GMT", "version": "v1" } ]
2014-01-21
[ [ "Ginsberg", "Matthew L.", "" ] ]
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Dr.Fill: Crosswords and an Implemented Solver for Singly Weighted CSPs
http://arxiv.org/abs/1401.4597v1
http://arxiv.org/pdf/1401.4597v1.pdf
https://github.com/vinayakathavale/crossword-solver
false
false
https://paperswithcode.com/paper/drfill-crosswords-and-an-implemented-solver
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1401.4598
Ruoyun Huang
Ruoyun Huang, Yixin Chen, Weixiong Zhang
SAS+ Planning as Satisfiability
null
Journal Of Artificial Intelligence Research, Volume 43, pages 293-328, 2012
10.1613/jair.3442
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Planning as satisfiability is a principal approach to planning with many eminent advantages. The existing planning as satisfiability techniques usually use encodings compiled from STRIPS. We introduce a novel SAT encoding scheme (SASE) based on the SAS+ formalism. The new scheme exploits the structural information in SAS+, resulting in an encoding that is both more compact and efficient for planning. We prove the correctness of the new encoding by establishing an isomorphism between the solution plans of SASE and that of STRIPS based encodings. We further analyze the transition variables newly introduced in SASE to explain why it accommodates modern SAT solving algorithms and improves performance. We give empirical statistical results to support our analysis. We also develop a number of techniques to further reduce the encoding size of SASE, and conduct experimental studies to show the strength of each individual technique. Finally, we report extensive experimental results to demonstrate significant improvements of SASE over the state-of-the-art STRIPS based encoding schemes in terms of both time and memory efficiency.
[ { "created": "Sat, 18 Jan 2014 21:05:52 GMT", "version": "v1" } ]
2014-01-21
[ [ "Huang", "Ruoyun", "" ], [ "Chen", "Yixin", "" ], [ "Zhang", "Weixiong", "" ] ]
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1401.4599
Freek Stulp
Freek Stulp, Andreas Fedrizzi, Lorenz M\"osenlechner, Michael Beetz
Learning and Reasoning with Action-Related Places for Robust Mobile Manipulation
null
Journal Of Artificial Intelligence Research, Volume 43, pages 1-42, 2012
10.1613/jair.3451
null
cs.RO cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose the concept of Action-Related Place (ARPlace) as a powerful and flexible representation of task-related place in the context of mobile manipulation. ARPlace represents robot base locations not as a single position, but rather as a collection of positions, each with an associated probability that the manipulation action will succeed when located there. ARPlaces are generated using a predictive model that is acquired through experience-based learning, and take into account the uncertainty the robot has about its own location and the location of the object to be manipulated. When executing the task, rather than choosing one specific goal position based only on the initial knowledge about the task context, the robot instantiates an ARPlace, and bases its decisions on this ARPlace, which is updated as new information about the task becomes available. To show the advantages of this least-commitment approach, we present a transformational planner that reasons about ARPlaces in order to optimize symbolic plans. Our empirical evaluation demonstrates that using ARPlaces leads to more robust and efficient mobile manipulation in the face of state estimation uncertainty on our simulated robot.
[ { "created": "Sat, 18 Jan 2014 21:08:22 GMT", "version": "v1" } ]
2014-01-21
[ [ "Stulp", "Freek", "" ], [ "Fedrizzi", "Andreas", "" ], [ "Mösenlechner", "Lorenz", "" ], [ "Beetz", "Michael", "" ] ]
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1401.4600
Yifeng Zeng
Yifeng Zeng, Prashant Doshi
Exploiting Model Equivalences for Solving Interactive Dynamic Influence Diagrams
null
Journal Of Artificial Intelligence Research, Volume 43, pages 211-255, 2012
10.1613/jair.3461
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We focus on the problem of sequential decision making in partially observable environments shared with other agents of uncertain types having similar or conflicting objectives. This problem has been previously formalized by multiple frameworks one of which is the interactive dynamic influence diagram (I-DID), which generalizes the well-known influence diagram to the multiagent setting. I-DIDs are graphical models and may be used to compute the policy of an agent given its belief over the physical state and others models, which changes as the agent acts and observes in the multiagent setting. As we may expect, solving I-DIDs is computationally hard. This is predominantly due to the large space of candidate models ascribed to the other agents and its exponential growth over time. We present two methods for reducing the size of the model space and stemming its exponential growth. Both these methods involve aggregating individual models into equivalence classes. Our first method groups together behaviorally equivalent models and selects only those models for updating which will result in predictive behaviors that are distinct from others in the updated model space. The second method further compacts the model space by focusing on portions of the behavioral predictions. Specifically, we cluster actionally equivalent models that prescribe identical actions at a single time step. Exactly identifying the equivalences would require us to solve all models in the initial set. We avoid this by selectively solving some of the models, thereby introducing an approximation. We discuss the error introduced by the approximation, and empirically demonstrate the improved efficiency in solving I-DIDs due to the equivalences.
[ { "created": "Sat, 18 Jan 2014 21:09:03 GMT", "version": "v1" } ]
2014-01-21
[ [ "Zeng", "Yifeng", "" ], [ "Doshi", "Prashant", "" ] ]
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1401.4601
Gilles Pesant
Gilles Pesant, Claude-Guy Quimper, Alessandro Zanarini
Counting-Based Search: Branching Heuristics for Constraint Satisfaction Problems
null
Journal Of Artificial Intelligence Research, Volume 43, pages 173-210, 2012
10.1613/jair.3463
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Designing a search heuristic for constraint programming that is reliable across problem domains has been an important research topic in recent years. This paper concentrates on one family of candidates: counting-based search. Such heuristics seek to make branching decisions that preserve most of the solutions by determining what proportion of solutions to each individual constraint agree with that decision. Whereas most generic search heuristics in constraint programming rely on local information at the level of the individual variable, our search heuristics are based on more global information at the constraint level. We design several algorithms that are used to count the number of solutions to specific families of constraints and propose some search heuristics exploiting such information. The experimental part of the paper considers eight problem domains ranging from well-established benchmark puzzles to rostering and sport scheduling. An initial empirical analysis identifies heuristic maxSD as a robust candidate among our proposals.eWe then evaluate the latter against the state of the art, including the latest generic search heuristics, restarts, and discrepancy-based tree traversals. Experimental results show that counting-based search generally outperforms other generic heuristics.
[ { "created": "Sat, 18 Jan 2014 21:09:25 GMT", "version": "v1" } ]
2014-01-21
[ [ "Pesant", "Gilles", "" ], [ "Quimper", "Claude-Guy", "" ], [ "Zanarini", "Alessandro", "" ] ]
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1401.4602
Edith Elkind
Edith Elkind, Piotr Faliszewski, Arkadii Slinko
Cloning in Elections: Finding the Possible Winners
null
Journal Of Artificial Intelligence Research, Volume 42, pages 529-573, 2011
10.1613/jair.3468
null
cs.GT cs.MA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the problem of manipulating elections by cloning candidates. In our model, a manipulator can replace each candidate c by several clones, i.e., new candidates that are so similar to c that each voter simply replaces c in his vote with a block of these new candidates, ranked consecutively. The outcome of the resulting election may then depend on the number of clones as well as on how each voter orders the clones within the block. We formalize what it means for a cloning manipulation to be successful (which turns out to be a surprisingly delicate issue), and, for a number of common voting rules, characterize the preference profiles for which a successful cloning manipulation exists. We also consider the model where there is a cost associated with producing each clone, and study the complexity of finding a minimum-cost cloning manipulation. Finally, we compare cloning with two related problems: the problem of control by adding candidates and the problem of possible (co)winners when new alternatives can join.
[ { "created": "Sat, 18 Jan 2014 21:09:41 GMT", "version": "v1" } ]
2014-01-21
[ [ "Elkind", "Edith", "" ], [ "Faliszewski", "Piotr", "" ], [ "Slinko", "Arkadii", "" ] ]
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1401.4603
Esperanza Albacete
Esperanza Albacete, Javier Calle, Elena Castro, Dolores Cuadra
Semantic Similarity Measures Applied to an Ontology for Human-Like Interaction
null
Journal Of Artificial Intelligence Research, Volume 44, pages 397-421, 2012
10.1613/jair.3612
null
cs.AI cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The focus of this paper is the calculation of similarity between two concepts from an ontology for a Human-Like Interaction system. In order to facilitate this calculation, a similarity function is proposed based on five dimensions (sort, compositional, essential, restrictive and descriptive) constituting the structure of ontological knowledge. The paper includes a proposal for computing a similarity function for each dimension of knowledge. Later on, the similarity values obtained are weighted and aggregated to obtain a global similarity measure. In order to calculate those weights associated to each dimension, four training methods have been proposed. The training methods differ in the element to fit: the user, concepts or pairs of concepts, and a hybrid approach. For evaluating the proposal, the knowledge base was fed from WordNet and extended by using a knowledge editing toolkit (Cognos). The evaluation of the proposal is carried out through the comparison of system responses with those given by human test subjects, both providing a measure of the soundness of the procedure and revealing ways in which the proposal may be improved.
[ { "created": "Sat, 18 Jan 2014 21:09:42 GMT", "version": "v1" } ]
2014-01-21
[ [ "Albacete", "Esperanza", "" ], [ "Calle", "Javier", "" ], [ "Castro", "Elena", "" ], [ "Cuadra", "Dolores", "" ] ]
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1401.4604
Bernardo Cuenca Grau
Bernardo Cuenca Grau, Boris Motik, Giorgos Stoilos, Ian Horrocks
Completeness Guarantees for Incomplete Ontology Reasoners: Theory and Practice
null
Journal Of Artificial Intelligence Research, Volume 43, pages 419-476, 2012
10.1613/jair.3470
null
cs.AI cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
To achieve scalability of query answering, the developers of Semantic Web applications are often forced to use incomplete OWL 2 reasoners, which fail to derive all answers for at least one query, ontology, and data set. The lack of completeness guarantees, however, may be unacceptable for applications in areas such as health care and defence, where missing answers can adversely affect the applications functionality. Furthermore, even if an application can tolerate some level of incompleteness, it is often advantageous to estimate how many and what kind of answers are being lost. In this paper, we present a novel logic-based framework that allows one to check whether a reasoner is complete for a given query Q and ontology T---that is, whether the reasoner is guaranteed to compute all answers to Q w.r.t. T and an arbitrary data set A. Since ontologies and typical queries are often fixed at application design time, our approach allows application developers to check whether a reasoner known to be incomplete in general is actually complete for the kinds of input relevant for the application. We also present a technique that, given a query Q, an ontology T, and reasoners R_1 and R_2 that satisfy certain assumptions, can be used to determine whether, for each data set A, reasoner R_1 computes more answers to Q w.r.t. T and A than reasoner R_2. This allows application developers to select the reasoner that provides the highest degree of completeness for Q and T that is compatible with the applications scalability requirements. Our results thus provide a theoretical and practical foundation for the design of future ontology-based information systems that maximise scalability while minimising or even eliminating incompleteness of query answers.
[ { "created": "Sat, 18 Jan 2014 21:10:03 GMT", "version": "v1" } ]
2014-01-21
[ [ "Grau", "Bernardo Cuenca", "" ], [ "Motik", "Boris", "" ], [ "Stoilos", "Giorgos", "" ], [ "Horrocks", "Ian", "" ] ]
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1401.4605
J.H.M. Lee
J.H.M. Lee, Ka Lun Leung
Consistency Techniques for Flow-Based Projection-Safe Global Cost Functions in Weighted Constraint Satisfaction
null
Journal Of Artificial Intelligence Research, Volume 43, pages 257-292, 2012
10.1613/jair.3476
null
cs.AI cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Many combinatorial problems deal with preferences and violations, the goal of which is to find solutions with the minimum cost. Weighted constraint satisfaction is a framework for modeling such problems, which consists of a set of cost functions to measure the degree of violation or preferences of different combinations of variable assignments. Typical solution methods for weighted constraint satisfaction problems (WCSPs) are based on branch-and-bound search, which are made practical through the use of powerful consistency techniques such as AC*, FDAC*, EDAC* to deduce hidden cost information and value pruning during search. These techniques, however, are designed to be efficient only on binary and ternary cost functions which are represented in table form. In tackling many real-life problems, high arity (or global) cost functions are required. We investigate efficient representation scheme and algorithms to bring the benefits of the consistency techniques to also high arity cost functions, which are often derived from hard global constraints from classical constraint satisfaction. The literature suggests some global cost functions can be represented as flow networks, and the minimum cost flow algorithm can be used to compute the minimum costs of such networks in polynomial time. We show that naive adoption of this flow-based algorithmic method for global cost functions can result in a stronger form of null-inverse consistency. We further show how the method can be modified to handle cost projections and extensions to maintain generalized versions of AC* and FDAC* for cost functions with more than two variables. Similar generalization for the stronger EDAC* is less straightforward. We reveal the oscillation problem when enforcing EDAC* on cost functions sharing more than one variable. To avoid oscillation, we propose a weak version of EDAC* and generalize it to weak EDGAC* for non-binary cost functions. Using various benchmarks involving the soft variants of hard global constraints ALLDIFFERENT, GCC, SAME, and REGULAR, empirical results demonstrate that our proposal gives improvements of up to an order of magnitude when compared with the traditional constraint optimization approach, both in terms of time and pruning.
[ { "created": "Sat, 18 Jan 2014 21:10:22 GMT", "version": "v1" } ]
2014-01-21
[ [ "Lee", "J. H. M.", "" ], [ "Leung", "Ka Lun", "" ] ]
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1401.4606
Patrick Raymond Conrad
Patrick Raymond Conrad, Brian Williams
Drake: An Efficient Executive for Temporal Plans with Choice
null
Journal Of Artificial Intelligence Research, Volume 42, pages 607-659, 2011
10.1613/jair.3478
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This work presents Drake, a dynamic executive for temporal plans with choice. Dynamic plan execution strategies allow an autonomous agent to react quickly to unfolding events, improving the robustness of the agent. Prior work developed methods for dynamically dispatching Simple Temporal Networks, and further research enriched the expressiveness of the plans executives could handle, including discrete choices, which are the focus of this work. However, in some approaches to date, these additional choices induce significant storage or latency requirements to make flexible execution possible. Drake is designed to leverage the low latency made possible by a preprocessing step called compilation, while avoiding high memory costs through a compact representation. We leverage the concepts of labels and environments, taken from prior work in Assumption-based Truth Maintenance Systems (ATMS), to concisely record the implications of the discrete choices, exploiting the structure of the plan to avoid redundant reasoning or storage. Our labeling and maintenance scheme, called the Labeled Value Set Maintenance System, is distinguished by its focus on properties fundamental to temporal problems, and, more generally, weighted graph algorithms. In particular, the maintenance system focuses on maintaining a minimal representation of non-dominated constraints. We benchmark Drakes performance on random structured problems, and find that Drake reduces the size of the compiled representation by a factor of over 500 for large problems, while incurring only a modest increase in run-time latency, compared to prior work in compiled executives for temporal plans with discrete choices.
[ { "created": "Sat, 18 Jan 2014 21:10:40 GMT", "version": "v1" } ]
2014-01-21
[ [ "Conrad", "Patrick Raymond", "" ], [ "Williams", "Brian", "" ] ]
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1401.4607
Joohyung Lee
Joohyung Lee, Ravi Palla
Reformulating the Situation Calculus and the Event Calculus in the General Theory of Stable Models and in Answer Set Programming
null
Journal Of Artificial Intelligence Research, Volume 43, pages 571-620, 2012
10.1613/jair.3489
null
cs.AI cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Circumscription and logic programs under the stable model semantics are two well-known nonmonotonic formalisms. The former has served as a basis of classical logic based action formalisms, such as the situation calculus, the event calculus and temporal action logics; the latter has served as a basis of a family of action languages, such as language A and several of its descendants. Based on the discovery that circumscription and the stable model semantics coincide on a class of canonical formulas, we reformulate the situation calculus and the event calculus in the general theory of stable models. We also present a translation that turns the reformulations further into answer set programs, so that efficient answer set solvers can be applied to compute the situation calculus and the event calculus.
[ { "created": "Sat, 18 Jan 2014 21:11:15 GMT", "version": "v1" } ]
2014-01-21
[ [ "Lee", "Joohyung", "" ], [ "Palla", "Ravi", "" ] ]
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1401.4609
L\'eon R. Planken
L\'eon R. Planken, Mathijs M. de Weerdt, Roman P.J. van der Krogt
Computing All-Pairs Shortest Paths by Leveraging Low Treewidth
null
Journal Of Artificial Intelligence Research, Volume 43, pages 353-388, 2012
10.1613/jair.3509
null
cs.DS cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present two new and efficient algorithms for computing all-pairs shortest paths. The algorithms operate on directed graphs with real (possibly negative) weights. They make use of directed path consistency along a vertex ordering d. Both algorithms run in O(n^2 w_d) time, where w_d is the graph width induced by this vertex ordering. For graphs of constant treewidth, this yields O(n^2) time, which is optimal. On chordal graphs, the algorithms run in O(nm) time. In addition, we present a variant that exploits graph separators to arrive at a run time of O(n w_d^2 + n^2 s_d) on general graphs, where s_d andlt= w_d is the size of the largest minimal separator induced by the vertex ordering d. We show empirically that on both constructed and realistic benchmarks, in many cases the algorithms outperform Floyd-Warshalls as well as Johnsons algorithm, which represent the current state of the art with a run time of O(n^3) and O(nm + n^2 log n), respectively. Our algorithms can be used for spatial and temporal reasoning, such as for the Simple Temporal Problem, which underlines their relevance to the planning and scheduling community.
[ { "created": "Sat, 18 Jan 2014 21:23:48 GMT", "version": "v1" } ]
2014-01-21
[ [ "Planken", "Léon R.", "" ], [ "de Weerdt", "Mathijs M.", "" ], [ "van der Krogt", "Roman P. J.", "" ] ]
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1401.4610
Evgeny Asmolov S
Tatiana V. Nizkaya, Evgeny S. Asmolov, Olga I. Vinogradova
'Gas cushion' model and hydrodynamic boundary conditions for superhydrophobic textures
8 pages, 6 figures
Phys. Rev. E 90, 043017 (2014)
10.1103/PhysRevE.90.043017
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Superhydrophobic Cassie textures with trapped gas bubbles reduce drag, by generating large effective slip, which is important for a variety of applications that involve a manipulation of liquids at the small scale. Here we discuss how the dissipation in the gas phase of textures modifies their friction properties. We propose an operator method, which allows us the mapping of the flow in the gas subphase to a local slip boundary condition at the liquid/gas interface. The determined uniquely local slip length depends on the viscosity contrast and underlying topography, and can be immediately used to evaluate an effective slip of the texture. Besides superlubricating Cassie surfaces our approach is valid for rough surfaces impregnated by a low-viscosity 'lubricant', and even for Wenzel textures, where a liquid follows the surface relief. These results provide a framework for the rational design of textured surfaces for numerous applications.
[ { "created": "Sat, 18 Jan 2014 21:24:36 GMT", "version": "v1" }, { "created": "Wed, 4 Jun 2014 09:11:08 GMT", "version": "v2" }, { "created": "Mon, 6 Oct 2014 19:08:25 GMT", "version": "v3" } ]
2015-01-13
[ [ "Nizkaya", "Tatiana V.", "" ], [ "Asmolov", "Evgeny S.", "" ], [ "Vinogradova", "Olga I.", "" ] ]
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1401.4612
Javier Velez
Javier Velez, Garrett Hemann, Albert S. Huang, Ingmar Posner, Nicholas Roy
Modelling Observation Correlations for Active Exploration and Robust Object Detection
null
Journal Of Artificial Intelligence Research, Volume 44, pages 423-453, 2012
10.1613/jair.3516
null
cs.RO cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Today, mobile robots are expected to carry out increasingly complex tasks in multifarious, real-world environments. Often, the tasks require a certain semantic understanding of the workspace. Consider, for example, spoken instructions from a human collaborator referring to objects of interest; the robot must be able to accurately detect these objects to correctly understand the instructions. However, existing object detection, while competent, is not perfect. In particular, the performance of detection algorithms is commonly sensitive to the position of the sensor relative to the objects in the scene. This paper presents an online planning algorithm which learns an explicit model of the spatial dependence of object detection and generates plans which maximize the expected performance of the detection, and by extension the overall plan performance. Crucially, the learned sensor model incorporates spatial correlations between measurements, capturing the fact that successive measurements taken at the same or nearby locations are not independent. We show how this sensor model can be incorporated into an efficient forward search algorithm in the information space of detected objects, allowing the robot to generate motion plans efficiently. We investigate the performance of our approach by addressing the tasks of door and text detection in indoor environments and demonstrate significant improvement in detection performance during task execution over alternative methods in simulated and real robot experiments.
[ { "created": "Sat, 18 Jan 2014 21:37:47 GMT", "version": "v1" } ]
2014-01-21
[ [ "Velez", "Javier", "" ], [ "Hemann", "Garrett", "" ], [ "Huang", "Albert S.", "" ], [ "Posner", "Ingmar", "" ], [ "Roy", "Nicholas", "" ] ]
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1401.4613
Peter Jeavons
Peter Jeavons, Justyna Petke
Local Consistency and SAT-Solvers
null
Journal Of Artificial Intelligence Research, Volume 43, pages 329-351, 2012
10.1613/jair.3531
null
cs.AI cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Local consistency techniques such as k-consistency are a key component of specialised solvers for constraint satisfaction problems. In this paper we show that the power of using k-consistency techniques on a constraint satisfaction problem is precisely captured by using a particular inference rule, which we call negative-hyper-resolution, on the standard direct encoding of the problem into Boolean clauses. We also show that current clause-learning SAT-solvers will discover in expected polynomial time any inconsistency that can be deduced from a given set of clauses using negative-hyper-resolvents of a fixed size. We combine these two results to show that, without being explicitly designed to do so, current clause-learning SAT-solvers efficiently simulate k-consistency techniques, for all fixed values of k. We then give some experimental results to show that this feature allows clause-learning SAT-solvers to efficiently solve certain families of constraint problems which are challenging for conventional constraint-programming solvers.
[ { "created": "Sat, 18 Jan 2014 21:39:00 GMT", "version": "v1" } ]
2014-01-21
[ [ "Jeavons", "Peter", "" ], [ "Petke", "Justyna", "" ] ]
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1401.4620
Michael Wilkinson
Michael Wilkinson
A test-tube model for rainfall
5 pages, no figures
null
10.1209/0295-5075/106/40001
null
physics.ao-ph cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
If the temperature of a cell containing two partially miscible liquids is changed very slowly, so that the miscibility is decreased, microscopic droplets nucleate, grow and migrate to the interface due to their buoyancy. The system may show an approximately periodic variation of the turbidity of the mixture, as the mean droplet size fluctuates. These precipitation events are analogous to rainfall from warm clouds. This paper considers a theoretical model for these experiments. After nucleation the initial growth is by Ostwald ripening, followed by a finite-time runaway growth of droplet sizes due to larger droplets sweeping up smaller ones. The model predicts that the period $\Delta t$ and the temperature sweep rate $\xi$ are related by $\Delta t\sim C \xi^{-3/7}$, and is in good agreement with experiments. The coefficient $C$ has a power-law divergence approaching the critical point of the miscibility transition: $C\sim (T-T_{\rm c})^{-\eta}$, and the critical exponent $\eta$ is determined.
[ { "created": "Sat, 18 Jan 2014 23:21:25 GMT", "version": "v1" } ]
2015-06-18
[ [ "Wilkinson", "Michael", "" ] ]
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1401.4625
Junye Wang
Junye Wang
Commercialization of fuel cells: myth or reality?
5 pages
null
null
null
physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Despite huge investment and efforts in the last decades, fuel cells are still known as a fledgling industry after 170 years of the first fuel cell. It becomes clear that these investment and efforts did not address the critical questions. Why upscaling of fuel cells failed often when many researchers stated their successes in small scale? Why the fuel cells with simpler structure still lag far from the internal combustion (IC) engines and gas turbines? Could the current investment of the hydrogen infrastructure reduce substantially the fuel cell cost and make a breakthrough to the key issues of durability, reliability and robustness? In this paper, we study these fundamental questions and point out a must-way possible to reduce cost of fuel cells and to substantially improve durability and reliability.
[ { "created": "Sun, 19 Jan 2014 01:03:02 GMT", "version": "v1" } ]
2014-01-21
[ [ "Wang", "Junye", "" ] ]
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1401.4629
Moustafa Mohamed
Moustafa Mohamed, Zheng Li, Xi Chen, Alan Mickelson
HERMES: A Hierarchical Broadcast-Based Silicon Photonic Interconnect for Scalable Many-Core Systems
10 pages
null
null
null
cs.AR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Optical interconnection networks, as enabled by recent advances in silicon photonic device and fabrication technology, have the potential to address on-chip and off-chip communication bottlenecks in many-core systems. Although several designs have shown superior power efficiency and performance compared to electrical alternatives, these networks will not scale to the thousands of cores required in the future. In this paper, we introduce Hermes, a hybrid network composed of an optimized broadcast for power-efficient low-latency global-scale coordination and circuit-switch sub-networks for high-throughput data delivery. This network will scale for use in thousand core chip systems. At the physical level, SoI-based adiabatic coupler has been designed to provide low-loss and compact optical power splitting. Based on the adiabatic coupler, a topology based on 2-ary folded butterfly is designed to provide linear power division in a thousand core layout with minimal cross-overs. To address the network agility and provide for efficient use of optical bandwidth, a flow control and routing mechanism is introduced to dynamically allocate bandwidth and provide fairness usage of network resources. At the system level, bloom filter-based filtering for localization of communication are designed for reducing global traffic. In addition, a novel greedy-based data and workload migration are leveraged to increase the locality of communication in a NUCA (non-uniform cache access) architecture. First order analytic evaluation results have indicated that Hermes is scalable to at least 1024 cores and offers significant performance improvement and power savings over prior silicon photonic designs.
[ { "created": "Sun, 19 Jan 2014 03:20:40 GMT", "version": "v1" } ]
2014-01-21
[ [ "Mohamed", "Moustafa", "" ], [ "Li", "Zheng", "" ], [ "Chen", "Xi", "" ], [ "Mickelson", "Alan", "" ] ]
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1401.4633
Pengwei Wang
Pengwei Wang and Reihaneh Safavi-Naini
Efficient Codes for Adversarial Wiretap Channels
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null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In [13] we proposed a ({\rho}_r , {\rho}_w )-adversarial wiretap channel model (AWTP) in which the adversary can adaptively choose to see a fraction {\rho}_r of the codeword sent over the channel, and modify a fraction {\rho}_w of the codeword by adding arbitrary noise values to them. In this paper we give the first efficient construction of a capacity achieving code family that provides perfect secrecy for this channel.
[ { "created": "Sun, 19 Jan 2014 03:39:56 GMT", "version": "v1" } ]
2014-01-21
[ [ "Wang", "Pengwei", "" ], [ "Safavi-Naini", "Reihaneh", "" ] ]
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1401.4634
Farzad Farnoud (Hassanzadeh)
Farzad Farnoud (Hassanzadeh), Moshe Schwartz, Jehoshua Bruck
The Capacity of String-Replication Systems
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null
null
null
cs.IT cs.CL math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is known that the majority of the human genome consists of repeated sequences. Furthermore, it is believed that a significant part of the rest of the genome also originated from repeated sequences and has mutated to its current form. In this paper, we investigate the possibility of constructing an exponentially large number of sequences from a short initial sequence and simple replication rules, including those resembling genomic replication processes. In other words, our goal is to find out the capacity, or the expressive power, of these string-replication systems. Our results include exact capacities, and bounds on the capacities, of four fundamental string-replication systems.
[ { "created": "Sun, 19 Jan 2014 03:57:39 GMT", "version": "v1" } ]
2014-01-21
[ [ "Farnoud", "Farzad", "", "Hassanzadeh" ], [ "Schwartz", "Moshe", "" ], [ "Bruck", "Jehoshua", "" ] ]
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1401.4642
Arya Mazumdar
Arya Mazumdar
On the Capacity of Memoryless Adversary
Submitted
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we study a model of communication under adversarial noise. In this model, the adversary makes online decisions on whether to corrupt a transmitted bit based on only the value of that bit. Like the usual binary symmetric channel of information theory or the fully adversarial channel of combinatorial coding theory, the adversary can, with high probability, introduce at most a given fraction of error. It is shown that, the capacity (maximum rate of reliable information transfer) of such memoryless adversary is strictly below that of the binary symmetric channel. We give new upper bound on the capacity of such channel -- the tightness of this upper bound remains an open question. The main component of our proof is the careful examination of error-correcting properties of a code with skewed distance distribution.
[ { "created": "Sun, 19 Jan 2014 08:00:44 GMT", "version": "v1" } ]
2014-01-21
[ [ "Mazumdar", "Arya", "" ] ]
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