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1402.4596
Jon Goldwin
J. Goldwin, B. Prasanna Venkatesh, D. H. J. O'Dell
Backaction-Driven Transport of Bloch Oscillating Atoms in Ring Cavities
Published version: 5 pages, 4 figures; Supplementary Material included
Phys. Rev. Lett. 113, 073003 (2014)
10.1103/PhysRevLett.113.073003
APCTP Pre2014 - 002
cond-mat.quant-gas physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We predict that an atomic Bose-Einstein condensate strongly coupled to an intracavity optical lattice can undergo resonant tunneling and directed transport when a constant and uniform bias force is applied. The bias force induces Bloch oscillations, causing amplitude and phase modulation of the lattice which resonantly modifies the site-to-site tunneling. For the right choice of parameters a net atomic current is generated. The transport velocity can be oriented oppositely to the bias force, with its amplitude and direction controlled by the detuning between the pump laser and the cavity. The transport can also be enhanced through imbalanced pumping of the two counter-propagating running wave cavity modes. Our results add to the cold atoms quantum simulation toolbox, with implications for quantum sensing and metrology.
[ { "created": "Wed, 19 Feb 2014 09:19:37 GMT", "version": "v1" }, { "created": "Tue, 19 Aug 2014 14:38:30 GMT", "version": "v2" } ]
2014-08-20
[ [ "Goldwin", "J.", "" ], [ "Venkatesh", "B. Prasanna", "" ], [ "O'Dell", "D. H. J.", "" ] ]
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1402.4597
J\"urgen M\"unch
Ulrike Becker-Kornstaedt, Daniela Boggio, J\"urgen M\"unch, Alexis Ocampo, Gino Palladino
Empirically Driven Design of Software Development Processes for Wireless Internet Services
15 pages. The final publication is available at http://link.springer.com/chapter/10.1007%2F3-540-36209-6_30
Product Focused Software Process Improvement, volume 2559 of Lecture Notes in Computer Science, pages 351-366. Springer Berlin Heidelberg, 2002
10.1007/3-540-36209-6_30
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The development of software for wireless services on the Internet is a challenging task due to the extreme time-to-market pressure, the newness of the application domain, and the quick evolution of the technical infrastructure. Nevertheless, developing software of a predetermined quality in a predictable fashion can only be achieved with systematic development processes and the use of engineering principles. Thus, systematic development processes for this domain are needed urgently. This article presents a method for the design of an adaptable software development process based on existing practices from related domains, industrial piloting, and expert knowledge. First results of the application of the method for the wireless Internet services domain are described. The benefit for the reader is twofold: the article describes a validated method on how to gain process knowledge for an upcoming field fast and incrementally. Furthermore, first results of the process design for the wireless Internet services domain are given.
[ { "created": "Wed, 19 Feb 2014 09:21:14 GMT", "version": "v1" } ]
2014-02-20
[ [ "Becker-Kornstaedt", "Ulrike", "" ], [ "Boggio", "Daniela", "" ], [ "Münch", "Jürgen", "" ], [ "Ocampo", "Alexis", "" ], [ "Palladino", "Gino", "" ] ]
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1402.4598
Oded Farago
Oded Farago, Niels Gr{\o}nbech-Jensen
Fluctuation-dissipation relation for systems with spatially varying friction
11 pages, 6 figures. Minor revisions to previous version. Accepted for publication in J. Stat. Phys
J. Stat. Phys. 156, 1093 (2014)
10.1007/s10955-014-1045-4
null
cond-mat.stat-mech cond-mat.soft physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
When a particle diffuses in a medium with spatially dependent friction coefficient $\alpha(r)$ at constant temperature $T$, it drifts toward the low friction end of the system even in the absence of any real physical force $f$. This phenomenon, which has been previously studied in the context of non-inertial Brownian dynamics, is termed "spurious drift", although the drift is real and stems from an inertial effect taking place at the short temporal scales. Here, we study the diffusion of particles in inhomogeneous media within the framework of the inertial Langevin equation. We demonstrate that the quantity which characterizes the dynamics with non-uniform $\alpha(r)$ is not the displacement of the particle $\Delta r=r-r^0$ (where $r^0$ is the initial position), but rather $\Delta A(r)=A(r)-A(r^0)$, where $A(r)$ is the primitive function of $\alpha(r)$. We derive expressions relating the mean and variance of $\Delta A$ to $f$, $T$, and the duration of the dynamics $\Delta t$. For a constant friction coefficient $\alpha(r)=\alpha$, these expressions reduce to the well known forms of the force-drift and fluctuation-dissipation relations. We introduce a very accurate method for Langevin dynamics simulations in systems with spatially varying $\alpha(r)$, and use the method to validate the newly derived expressions.
[ { "created": "Wed, 19 Feb 2014 09:22:59 GMT", "version": "v1" }, { "created": "Thu, 20 Feb 2014 21:19:34 GMT", "version": "v2" }, { "created": "Sun, 8 Jun 2014 11:47:17 GMT", "version": "v3" } ]
2015-06-18
[ [ "Farago", "Oded", "" ], [ "Grønbech-Jensen", "Niels", "" ] ]
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1402.4600
Sean Meyn
Sean Meyn, Prabir Barooah, Ana Bu\v{s}i\'c, Yue Chen, and Jordan Ehren
Ancillary Service to the Grid Using Intelligent Deferrable Loads
null
null
10.1109/TAC.2015.2414772
null
math.OC cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Renewable energy sources such as wind and solar power have a high degree of unpredictability and time-variation, which makes balancing demand and supply challenging. One possible way to address this challenge is to harness the inherent flexibility in demand of many types of loads. Introduced in this paper is a technique for decentralized control for automated demand response that can be used by grid operators as ancillary service for maintaining demand-supply balance. A Markovian Decision Process (MDP) model is introduced for an individual load. A randomized control architecture is proposed, motivated by the need for decentralized decision making, and the need to avoid synchronization that can lead to large and detrimental spikes in demand. An aggregate model for a large number of loads is then developed by examining the mean field limit. A key innovation is an LTI-system approximation of the aggregate nonlinear model, with a scalar signal as the input and a measure of the aggregate demand as the output. This makes the approximation particularly convenient for control design at the grid level. The second half of the paper contains a detailed application of these results to a network of residential pools. Simulations are provided to illustrate the accuracy of the approximations and effectiveness of the proposed control approach.
[ { "created": "Wed, 19 Feb 2014 09:30:09 GMT", "version": "v1" } ]
2016-04-18
[ [ "Meyn", "Sean", "" ], [ "Barooah", "Prabir", "" ], [ "Bušić", "Ana", "" ], [ "Chen", "Yue", "" ], [ "Ehren", "Jordan", "" ] ]
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1402.4610
Pascal Marquet
Pascal Marquet
On the concept of exergy and available enthalpy: Application to atmospheric energetics
Corrected and augmented version of a paper submitted in April 1990 to the Quarterly Journal of the Royal Meteorological Society. Published in Vol.117 (499), p.449-475, April 1991 (41 pages, 14 Figures)
null
10.1002/qj.49711749903
null
physics.ao-ph physics.flu-dyn physics.geo-ph physics.hist-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The available enthalpy is an early form of the modern thermodynamic concept of exergy, which is the generic name for the amount of work obtainable when some matter is brought to a state of equilibrium with its surroundings by means of reversible processes. It is shown in this paper that a study of the hydrodynamic properties of available enthalpy leads to a generalization of the global meteorological available energies previously introduced by Lorenz, Dutton and Pearce. A local energy cycle is derived without approximation. Moreover, static instabilities or topography do not prevent this theory from having practical applications. The concept of available enthalpy is also presented in terms of the potential change in total entropy. Using the hydrostatic assumption, limited-area energetics is then rigorously defined, including new boundary fluxes and new energy components. This innovative approach is especially suitable for the study of energy conversions between isobaric layers of an open limited atmospheric domain. Numerical evaluations of various energy components are presented for a hemispheric field of zonal-average temperature. It is further shown that this new energetic scheme realizes a hierarchical partition of the components so that the smallest of those available enthalpy reservoirs are almost of the same magnitude as the kinetic energy. This is actually the fundamental property that induced Margules to define the primary concept of available kinetic energy in meteorology.
[ { "created": "Wed, 19 Feb 2014 10:05:34 GMT", "version": "v1" } ]
2014-02-21
[ [ "Marquet", "Pascal", "" ] ]
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1402.4611
Petr Hellinger
Petr Hellinger and Pavel M. Travnicek
Solar wind protons at 1 AU: trends and bounds, constraints and correlations
Accepted for publication in ApJL
null
10.1088/2041-8205/784/1/L15
null
physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The proton temperature anisotropy in the solar wind exhibits apparent bounds which are compatible with the theoretical constraints imposed by temperature-anisotropy driven kinetic instabilities. Recent statistical analyses based on conditional averaging indicate that near these theoretical constraints the solar wind protons have typically enhanced temperatures and a weaker collisionality. Here we carefully analyze the solar wind data and show that these results are a consequence of superposition of multiple correlations in the solar wind, namely, they mostly result from the correlation between the proton temperature and the solar wind velocity and from the superimposed anti-correlation between the proton temperature anisotropy and the proton parallel beta in the fast solar wind. Colder and more collisional data are distributed around temperature isotropy whereas hotter and less collisional data have a wider range of the temperature anisotropy anti-correlated with the proton parallel beta with signatures of constraints owing to the temperature-anisotropy driven instabilities. However, most of the hot and weakly collisional data, including the hottest and least collisional ones, lies far from the marginal stability regions. Consequently, we conclude that there is no clear relation between the enhanced temperatures and instability constraints and that the conditional averaging used for these analyses must be used carefully and need to be well tested.
[ { "created": "Wed, 19 Feb 2014 10:09:41 GMT", "version": "v1" } ]
2014-09-12
[ [ "Hellinger", "Petr", "" ], [ "Travnicek", "Pavel M.", "" ] ]
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1402.4612
Xiaochen Zhao
Xiaochen Zhao and Wei Dai
Power Allocation in Compressed Sensing of Non-uniformly Sparse Signals
5 pages, 3 figures
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper studies the problem of power allocation in compressed sensing when different components in the unknown sparse signal have different probability to be non-zero. Given the prior information of the non-uniform sparsity and the total power budget, we are interested in how to optimally allocate the power across the columns of a Gaussian random measurement matrix so that the mean squared reconstruction error is minimized. Based on the state evolution technique originated from the work by Donoho, Maleki, and Montanari, we revise the so called approximate message passing (AMP) algorithm for the reconstruction and quantify the MSE performance in the asymptotic regime. Then the closed form of the optimal power allocation is obtained. The results show that in the presence of measurement noise, uniform power allocation, which results in the commonly used Gaussian random matrix with i.i.d. entries, is not optimal for non-uniformly sparse signals. Empirical results are presented to demonstrate the performance gain.
[ { "created": "Wed, 19 Feb 2014 10:13:28 GMT", "version": "v1" }, { "created": "Thu, 8 May 2014 21:47:16 GMT", "version": "v2" } ]
2014-05-12
[ [ "Zhao", "Xiaochen", "" ], [ "Dai", "Wei", "" ] ]
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1402.4618
Sean Meyn
Ana Bu\v{s}i\'c and Sean Meyn
Passive Dynamics in Mean Field Control
To appear IEEE CDC, 2014
Proc. 53rd IEEE Conference on Decision and Control, 2014
10.1109/CDC.2014.7039805
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Mean-field models are a popular tool in a variety of fields. They provide an understanding of the impact of interactions among a large number of particles or people or other "self-interested agents", and are an increasingly popular tool in distributed control. This paper considers a particular randomized distributed control architecture introduced in our own recent work. In numerical results it was found that the associated mean-field model had attractive properties for purposes of control. In particular, when viewed as an input-output system, its linearization was found to be minimum phase. In this paper we take a closer look at the control model. The results are summarized as follows: (i) The Markov Decision Process framework of Todorov is extended to continuous time models, in which the "control cost" is based on relative entropy. This is the basis of the construction of a family of controlled Markovian generators. (ii) A decentralized control architecture is proposed in which each agent evolves as a controlled Markov process. A central authority broadcasts a common control signal to each agent. The central authority chooses this signal based on an aggregate scalar output of the Markovian agents. (iii) Provided the control-free system is a reversible Markov process, the following identity holds for the linearization, \[ \text{Real} (G(j\omega)) = \text{PSD}_Y(\omega)\ge 0, \quad \omega\in\Re, \] where the right hand side denotes the power spectral density for the output of any one of the individual (control-free) Markov processes.
[ { "created": "Wed, 19 Feb 2014 10:56:46 GMT", "version": "v1" }, { "created": "Wed, 24 Sep 2014 13:12:25 GMT", "version": "v2" } ]
2016-04-18
[ [ "Bušić", "Ana", "" ], [ "Meyn", "Sean", "" ] ]
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1402.4621
Tingshao Zhu
Dong Nie, Bibo Hao, Zheng Yan, Tingshao Zhu
Cyber Behavior of Microblog Users: Onlies Versus Others
24 pages
null
null
null
cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Much research has been conducted to investigate personality and daily behavior of these only children ('Onlies') due to the Chinese one-child-per-family policy, and report the singleton generation to be more selfish. As Microblog becomes increasingly popular recently in China, we studied cyber behavior of Onlies and children with siblings ('Others') on Sina Microblog ('Weibo'), a leading Microblog service provider in China. Participants were 1792 Weibo users. Their recorded data on Weibo were downloaded to assess their cyber behaviors. The general results show that (1) Onlies have a smaller social circle; (2)Onlies are more significantly active on social platform.
[ { "created": "Wed, 19 Feb 2014 11:05:16 GMT", "version": "v1" } ]
2014-02-20
[ [ "Nie", "Dong", "" ], [ "Hao", "Bibo", "" ], [ "Yan", "Zheng", "" ], [ "Zhu", "Tingshao", "" ] ]
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1402.4622
Andres Santos
Elena Beltr\'an-Heredia and Andr\'es Santos
Fourth virial coefficient of additive hard-sphere mixtures in the Percus-Yevick and hypernetted-chain approximations
8 pages, 1 figure; v2: Minor changes; v3: Typo in Eq. (2.34) corrected
J. Chem. Phys. 140, 134507 (2014)
10.1063/1.4870011
null
cond-mat.stat-mech cond-mat.soft physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The fourth virial coefficient of additive hard-sphere mixtures, as predicted by the Percus-Yevick (PY) and hypernetted-chain (HNC) theories, is derived via the compressibility, virial, and chemical-potential routes, the outcomes being compared with exact results. Except in the case of the HNC compressibility route, the other five expressions exhibit a common structure involving the first three moments of the size distribution. In both theories the chemical-potential route is slightly better than the virial one and the best behavior is generally presented by the compressibility route. Moreover, the PY results with any of the three routes are more accurate than any of the HNC results.
[ { "created": "Wed, 19 Feb 2014 11:05:25 GMT", "version": "v1" }, { "created": "Mon, 14 Apr 2014 15:32:59 GMT", "version": "v2" }, { "created": "Fri, 4 Jul 2014 10:31:09 GMT", "version": "v3" } ]
2014-07-07
[ [ "Beltrán-Heredia", "Elena", "" ], [ "Santos", "Andrés", "" ] ]
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1402.4623
Dario Berzano
Dario Berzano, Jakob Blomer, Predrag Buncic, Ioannis Charalampidis, Gerardo Ganis, Georgios Lestaris and Ren\'e Meusel
PROOF as a Service on the Cloud: a Virtual Analysis Facility based on the CernVM ecosystem
Talk from Computing in High Energy and Nuclear Physics 2013 (CHEP2013), Amsterdam (NL), October 2013, 7 pages, 4 figures
null
10.1088/1742-6596/513/3/032007
null
cs.DC physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
PROOF, the Parallel ROOT Facility, is a ROOT-based framework which enables interactive parallelism for event-based tasks on a cluster of computing nodes. Although PROOF can be used simply from within a ROOT session with no additional requirements, deploying and configuring a PROOF cluster used to be not as straightforward. Recently great efforts have been spent to make the provisioning of generic PROOF analysis facilities with zero configuration, with the added advantages of positively affecting both stability and scalability, making the deployment operations feasible even for the end user. Since a growing amount of large-scale computing resources are nowadays made available by Cloud providers in a virtualized form, we have developed the Virtual PROOF-based Analysis Facility: a cluster appliance combining the solid CernVM ecosystem and PoD (PROOF on Demand), ready to be deployed on the Cloud and leveraging some peculiar Cloud features such as elasticity. We will show how this approach is effective both for sysadmins, who will have little or no configuration to do to run it on their Clouds, and for the end users, who are ultimately in full control of their PROOF cluster and can even easily restart it by themselves in the unfortunate event of a major failure. We will also show how elasticity leads to a more optimal and uniform usage of Cloud resources.
[ { "created": "Wed, 19 Feb 2014 11:14:53 GMT", "version": "v1" } ]
2015-06-18
[ [ "Berzano", "Dario", "" ], [ "Blomer", "Jakob", "" ], [ "Buncic", "Predrag", "" ], [ "Charalampidis", "Ioannis", "" ], [ "Ganis", "Gerardo", "" ], [ "Lestaris", "Georgios", "" ], [ "Meusel", "René", "" ] ]
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1402.4624
Aleksandr Aravkin
Aleksandr Y. Aravkin and Anju Kambadur and Aurelie C. Lozano and Ronny Luss
Sparse Quantile Huber Regression for Efficient and Robust Estimation
9 pages
null
null
null
stat.ML cs.DS math.OC stat.ME
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider new formulations and methods for sparse quantile regression in the high-dimensional setting. Quantile regression plays an important role in many applications, including outlier-robust exploratory analysis in gene selection. In addition, the sparsity consideration in quantile regression enables the exploration of the entire conditional distribution of the response variable given the predictors and therefore yields a more comprehensive view of the important predictors. We propose a generalized OMP algorithm for variable selection, taking the misfit loss to be either the traditional quantile loss or a smooth version we call quantile Huber, and compare the resulting greedy approaches with convex sparsity-regularized formulations. We apply a recently proposed interior point methodology to efficiently solve all convex formulations as well as convex subproblems in the generalized OMP setting, pro- vide theoretical guarantees of consistent estimation, and demonstrate the performance of our approach using empirical studies of simulated and genomic datasets.
[ { "created": "Wed, 19 Feb 2014 11:18:32 GMT", "version": "v1" } ]
2014-02-20
[ [ "Aravkin", "Aleksandr Y.", "" ], [ "Kambadur", "Anju", "" ], [ "Lozano", "Aurelie C.", "" ], [ "Luss", "Ronny", "" ] ]
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1402.4626
Louis M Shekhtman
Louis M. Shekhtman, Yehiel Berezin, Michael M. Danziger, Shlomo Havlin
Robustness of a Network Formed of Spatially Embedded Networks
null
null
10.1103/PhysRevE.90.012809
null
physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present analytic and numeric results for percolation in a network formed of interdependent spatially embedded networks. We show results for a treelike and a random regular network of networks each with $(i)$ unconstrained interdependent links and $(ii)$ interdependent links restricted to a maximum length, $r$. Analytic results are given for each network of networks with unconstrained dependency links and compared with simulations. For the case of two spatially embedded networks it was found that only for $r>r_c\approx8$ does the system undergo a first order phase transition. We find that for treelike networks of networks $r_c$ significantly decreases as $n$ increases and rapidly reaches its limiting value, $r=1$. For cases where the dependencies form loops, such as in random regular networks, we show analytically and confirm through simulations, that there is a certain fraction of dependent nodes, $q_{max}$, above which the entire network structure collapses even if a single node is removed. This $q_{max}$ decreases quickly with $m$, the degree of the random regular network of networks. Our results show the extreme sensitivity of coupled spatial networks and emphasize the susceptibility of these networks to sudden collapse. The theory derived here can be used to find the robustness of any network of networks where the profile of percolation of a single network is known.
[ { "created": "Wed, 19 Feb 2014 11:34:06 GMT", "version": "v1" } ]
2015-06-18
[ [ "Shekhtman", "Louis M.", "" ], [ "Berezin", "Yehiel", "" ], [ "Danziger", "Michael M.", "" ], [ "Havlin", "Shlomo", "" ] ]
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1402.4638
Aurelien Drezet
A. Drezet, A. Cuche, and S. Huant
Near-field microscopy with a single-photon point-like emitter: Resolution versus the aperture tip?
null
Optics communications, 284, 1444-1450 (2011)
10.1016/j.optcom.2010.10.097
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss theoretically the concept of spatial resolution in near-field scanning optical microscopy (NSOM) in light of a recent work [Opt. Express 17 (2009) 19969] which reported on the achievement of active tips made of a single ultrasmall fluorescent nanodiamond grafted onto the apex of a substrate tip and on their validation in NSOM imaging. Since fluorescent nanodiamonds tend to decrease steadily in size, we assimilate a nanodiamond-based tip to a point-like single photon source and compare its ultimate resolution with that offered by standard metal-coated aperture NSOM tips. We demonstrate both classically and quantum mechanically that NSOM based on a point-like tip has a resolving power that is only limited by the scan height over the imaged system whereas the aperture-tip resolution depends critically on both the scan height and aperture diameter. This is a consequence of the complex distribution of the electromagnetic field around the aperture that tends to artificially duplicate the imaged objects. We show that the point-like tip does not suffer from this "squint" and that it rapidly approaches its ultimate resolution in the near-field as soon its scan height falls below the distance between the two nano-objects to be resolved.
[ { "created": "Wed, 19 Feb 2014 12:28:32 GMT", "version": "v1" } ]
2015-06-18
[ [ "Drezet", "A.", "" ], [ "Cuche", "A.", "" ], [ "Huant", "S.", "" ] ]
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1402.4642
Oleg Verbitsky
Johannes K\"obler, Sebastian Kuhnert, Oleg Verbitsky
On the Isomorphism Problem for Helly Circular-Arc Graphs
22 pages, 5 figures. Section 5 is revised in this version
Information and Computation 247 (2016), pp. 266-277
10.1016/j.ic.2016.01.006
null
cs.CC cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The isomorphism problem is known to be efficiently solvable for interval graphs, while for the larger class of circular-arc graphs its complexity status stays open. We consider the intermediate class of intersection graphs for families of circular arcs that satisfy the Helly property. We solve the isomorphism problem for this class in logarithmic space. If an input graph has a Helly circular-arc model, our algorithm constructs it canonically, which means that the models constructed for isomorphic graphs are equal.
[ { "created": "Wed, 19 Feb 2014 12:32:59 GMT", "version": "v1" }, { "created": "Tue, 3 Nov 2015 11:52:11 GMT", "version": "v2" } ]
2017-04-20
[ [ "Köbler", "Johannes", "" ], [ "Kuhnert", "Sebastian", "" ], [ "Verbitsky", "Oleg", "" ] ]
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1402.4645
Jothi Prakash V
V. Jothi Prakash, Dr. L.M. Nithya
A Survey on Semi-Supervised Learning Techniques
5 Pages, 3 figures, Published with International Journal of Computer Trends and Technology (IJCTT)
International Journal of Computer Trends and Technology (IJCTT) 8(1):25-29, February 2014. ISSN:2231-2803.Published by Seventh Sense Research Group
10.14445/22312803/IJCTT-V8P105
null
cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Semisupervised learning is a learning standard which deals with the study of how computers and natural systems such as human beings acquire knowledge in the presence of both labeled and unlabeled data. Semisupervised learning based methods are preferred when compared to the supervised and unsupervised learning because of the improved performance shown by the semisupervised approaches in the presence of large volumes of data. Labels are very hard to attain while unlabeled data are surplus, therefore semisupervised learning is a noble indication to shrink human labor and improve accuracy. There has been a large spectrum of ideas on semisupervised learning. In this paper we bring out some of the key approaches for semisupervised learning.
[ { "created": "Wed, 19 Feb 2014 12:40:31 GMT", "version": "v1" } ]
2014-02-20
[ [ "Prakash", "V. Jothi", "" ], [ "Nithya", "Dr. L. M.", "" ] ]
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1402.4648
Wiktor Mlynarski
Wiktor M{\l}ynarski and J\"urgen Jost
Natural statistics of binaural sounds
29 pages, 13 figures
null
null
null
q-bio.NC cs.SD
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Binaural sound localization is usually considered a discrimination task, where interaural time (ITD) and level (ILD) disparities at pure frequency channels are utilized to identify a position of a sound source. In natural conditions binaural circuits are exposed to a stimulation by sound waves originating from multiple, often moving and overlapping sources. Therefore statistics of binaural cues depend on acoustic properties and the spatial configuration of the environment. In order to process binaural sounds efficiently, the auditory system should be adapted to naturally encountered cue distributions. Statistics of cues encountered naturally and their dependence on the physical properties of an auditory scene have not been studied before. Here, we performed binaural recordings of three auditory scenes with varying spatial properties. We have analyzed empirical cue distributions from each scene by fitting them with parametric probability density functions which allowed for an easy comparison of different scenes. Higher order statistics of binaural waveforms were analyzed by performing Independent Component Analysis (ICA) and studying properties of learned basis functions. Obtained results can be related to known neuronal mechanisms and suggest how binaural hearing can be understood in terms of adaptation to the natural signal statistics.
[ { "created": "Wed, 19 Feb 2014 12:47:05 GMT", "version": "v1" }, { "created": "Sat, 1 Mar 2014 01:32:16 GMT", "version": "v2" } ]
2014-03-04
[ [ "Młynarski", "Wiktor", "" ], [ "Jost", "Jürgen", "" ] ]
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1402.4653
Sohan Seth
Sohan Seth, John Shawe-Taylor, Samuel Kaski
Retrieval of Experiments by Efficient Estimation of Marginal Likelihood
null
null
null
null
stat.ML cs.IR cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the task of retrieving relevant experiments given a query experiment. By experiment, we mean a collection of measurements from a set of `covariates' and the associated `outcomes'. While similar experiments can be retrieved by comparing available `annotations', this approach ignores the valuable information available in the measurements themselves. To incorporate this information in the retrieval task, we suggest employing a retrieval metric that utilizes probabilistic models learned from the measurements. We argue that such a metric is a sensible measure of similarity between two experiments since it permits inclusion of experiment-specific prior knowledge. However, accurate models are often not analytical, and one must resort to storing posterior samples which demands considerable resources. Therefore, we study strategies to select informative posterior samples to reduce the computational load while maintaining the retrieval performance. We demonstrate the efficacy of our approach on simulated data with simple linear regression as the models, and real world datasets.
[ { "created": "Wed, 19 Feb 2014 13:21:40 GMT", "version": "v1" } ]
2014-02-20
[ [ "Seth", "Sohan", "" ], [ "Shawe-Taylor", "John", "" ], [ "Kaski", "Samuel", "" ] ]
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1402.4662
Evgeny Nikulchev
Evgeniy Pluzhnik, Evgeniy Nikulchev, Simon Payain
Optimal Control of Applications for Hybrid Cloud Services
4 pages, Proc. conf. (not published). arXiv admin note: text overlap with arXiv:1402.1469
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null
null
cs.DC cs.SY
http://creativecommons.org/licenses/by/3.0/
Development of cloud computing enables to move Big Data in the hybrid cloud services. This requires research of all processing systems and data structures for provide QoS. Due to the fact that there are many bottlenecks requires monitoring and control system when performing a query. The models and optimization criteria for the design of systems in a hybrid cloud infrastructures are created. In this article suggested approaches and the results of this build.
[ { "created": "Wed, 19 Feb 2014 13:49:50 GMT", "version": "v1" } ]
2014-02-20
[ [ "Pluzhnik", "Evgeniy", "" ], [ "Nikulchev", "Evgeniy", "" ], [ "Payain", "Simon", "" ] ]
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1402.4663
Evgeny Nikulchev
Evgeniy Pluzhnik, Evgeniy Nikulchev, Simon Payain
Concept of Feedback in Future Computing Models to Cloud Systems
10 pages. arXiv admin note: substantial text overlap with arXiv:1402.1469
World Applied Sciences Journal 32 (7): 1394-1399, 2014
10.5829/idosi.wasj.2014.32.07.588
null
cs.DC cs.NI cs.SY
http://creativecommons.org/licenses/by/3.0/
Currently, it is urgent to ensure QoS in distributed computing systems. This became especially important to the development and spread of cloud services. Big data structures become heavily distributed. Necessary to consider the communication channels and data transmission systems and virtualization and scalability in future design of computational models in problems of designing cloud systems, evaluating the effectiveness of the algorithms, the assessment of economic performance data centers. Requires not only the monitoring of data flows and computing resources, but also the operational management of these resources to QoS provide. Such a tool may be just the introduction of feedback in computational models. The article presents the main dynamic model with feedback as a basis for a new model of distributed computing processes. The research results are presented here. Formulated in this work can be used for other complex tasks - estimation of structural complexity of distributed databases, evaluation of dynamic characteristics of systems operating in the hybrid cloud, etc.
[ { "created": "Wed, 19 Feb 2014 13:53:22 GMT", "version": "v1" } ]
2014-11-18
[ [ "Pluzhnik", "Evgeniy", "" ], [ "Nikulchev", "Evgeniy", "" ], [ "Payain", "Simon", "" ] ]
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1402.4666
Peng Shi
Peng Shi, Shi-Cheng Zhao, Wen-Dong Li, and Yong-Jian Gu
Feasibility of underwater free space quantum key distribution
12 pages, 10 figures
J. Opt. Soc. Am. A 32 (3) (2015) 349-356
10.1364/JOSAA.32.000349
null
quant-ph physics.ao-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the optical absorption and scattering properties of underwater media pertinent to our underwater free space quantum key distribution (QKD) channel model. With the vector radiative transfer theory and Monte Carlo method, we obtain the attenuation of photons, the fidelity of the scattered photons, the quantum bit error rate and the sifted key generation rate of underwater quantum communication. It can be observed from our simulations that the most secure single photon underwater free space QKD is feasible in the clearest ocean water.
[ { "created": "Wed, 19 Feb 2014 13:59:58 GMT", "version": "v1" }, { "created": "Fri, 4 Apr 2014 21:15:13 GMT", "version": "v2" } ]
2017-10-24
[ [ "Shi", "Peng", "" ], [ "Zhao", "Shi-Cheng", "" ], [ "Li", "Wen-Dong", "" ], [ "Gu", "Yong-Jian", "" ] ]
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1402.4670
Daniele De Martino
G.De Concini, D.De Martino
Overelaxed hit-and-run Monte Carlo for the uniform sampling of convex bodies with applications in metabolic network analysis
null
null
10.1142/S0129183115500102
null
cond-mat.stat-mech physics.bio-ph q-bio.MN
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The uniform sampling of convex regions in high dimension is an important computational issue, from both theoretical and applied point of view. The hit-and-run montecarlo algorithms are the most efficient methods known to perform it and one of their bottlenecks relies in the difficulty of escaping from tight corners in high dimension. Inspired by optimized montecarlo methods used in statistical mechanics we define a new algorithm by overelaxing the hit-and-run dynamics. We made numerical simulations on high dimensional simplices in order to test its performances, pointing out its improved ability to escape from angles and finally apply it to an inference problem in the steady state dynamics of metabolic networks.
[ { "created": "Wed, 19 Feb 2014 14:15:08 GMT", "version": "v1" } ]
2015-06-18
[ [ "De Concini", "G.", "" ], [ "De Martino", "D.", "" ] ]
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1402.4674
Joerg Evers
M. G\"arttner, S. Whitlock, D. W. Sch\"onleber, J. Evers
Semi-analytical model for nonlinear light propagation in strongly interacting Rydberg gases
7 pages, 4 figures
Phys. Rev. A 89, 063407 (2014)
10.1103/PhysRevA.89.063407
null
physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Rate equation models are extensively used to describe the many-body states of laser driven atomic gases. We show that the properties of the rate equation model used to describe nonlinear optical effects arising in interacting Rydberg gases can be understood by considering the excitation of individual super-atoms. From this we deduce a simple semi-analytic model that accurately describes the Rydberg density and optical susceptibility for different dimensionalities. We identify the previously reported universal dependence of the susceptibility on the Rydberg excited fraction as an intrinsic property of the rate equation model that is rooted in one-body properties. Benchmarking against exact master equation calculations, we identify regimes in which the semi-analytic model is particularly reliable. The performance of the model improves in the presence of dephasing which destroys higher order atomic coherences.
[ { "created": "Wed, 19 Feb 2014 14:28:26 GMT", "version": "v1" } ]
2015-06-18
[ [ "Gärttner", "M.", "" ], [ "Whitlock", "S.", "" ], [ "Schönleber", "D. W.", "" ], [ "Evers", "J.", "" ] ]
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1402.4675
Boris Bellalta Dr.
T. Adame, A. Bel, B. Bellalta, J. Barcelo, M. Oliver
IEEE 802.11ah: The Wi-Fi Approach for M2M Communications
IEEE Wireless Magazine, 2014
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
M2M communications are projected to be one of the fastest growing technology segments of the IT sector in the next years. Sensor and actuator networks connect communication machines and devices so that they automatically transmit information, serving the growing demand for environmental data acquisition. IEEE 802.11ah Task Group addresses the creation of a new standard for giving response to the particular requirements of this type of networks: large number of power-constrained stations, long transmission range, small and infrequent data messages, low data-rates and non-critical delay. This article explores the key features of this new standard under development, especially those related to the reduction of energy consumption in the MAC Layer. In this direction, a performance assessment of IEEE 802.11ah in four typical M2M scenarios has been performed.
[ { "created": "Wed, 19 Feb 2014 14:35:12 GMT", "version": "v1" }, { "created": "Sun, 5 Oct 2014 17:46:59 GMT", "version": "v2" } ]
2014-10-07
[ [ "Adame", "T.", "" ], [ "Bel", "A.", "" ], [ "Bellalta", "B.", "" ], [ "Barcelo", "J.", "" ], [ "Oliver", "M.", "" ] ]
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1402.4678
Yelena Mandelshtam
Yelena Mandelshtam and Natalia Komarova
When Learners Surpass their Sources: Mathematical Modeling of Learning from an Inconsistent Source
21 pages, 5 figures
null
null
null
cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a new algorithm to model and investigate the learning process of a learner mastering a set of grammatical rules from an inconsistent source. The compelling interest of human language acquisition is that the learning succeeds in virtually every case, despite the fact that the input data are formally inadequate to explain the success of learning. Our model explains how a learner can successfully learn from or even surpass its imperfect source without possessing any additional biases or constraints about the types of patterns that exist in the language. We use the data collected by Singleton and Newport (2004) on the performance of a 7-year boy Simon, who mastered the American Sign Language (ASL) by learning it from his parents, both of whom were imperfect speakers of ASL. We show that the algorithm possesses a frequency-boosting property, whereby the frequency of the most common form of the source is increased by the learner. We also explain several key features of Simon's ASL.
[ { "created": "Tue, 18 Feb 2014 02:18:10 GMT", "version": "v1" } ]
2014-02-20
[ [ "Mandelshtam", "Yelena", "" ], [ "Komarova", "Natalia", "" ] ]
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1402.4695
Anatoly Nekrasov
Anatoly K. Nekrasov
On differences between the B- and E-approaches and the implications for the Solar atmosphere
13 pages
null
null
null
astro-ph.SR physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A simple collisional three-component plasma model consisting of electrons, ions, and neutrals with arbitrary collision frequencies and dynamic time scales is considered. It is shown that the usual MHD-approach dealing with magnetic field perturbations can give other results than the approach in which all perturbations are expressed via the perturbed electric field. For the partially ionized plasma with strong collisional coupling of neutrals with ions, magnetosonic (nondamping) and Alfv\'{e}n (weakly damping) waves modified by the presence of neutrals are obtained. It is shown that the magnetic diffusivity for Alfv\'{e}n waves appears only due to the longitudinal current connected with the field $E_{1z}$ at the angular propagation of perturbations relatively to the background magnetic field. The model can be applied to different parts of a solar atmosphere and prominences.
[ { "created": "Wed, 19 Feb 2014 15:25:01 GMT", "version": "v1" } ]
2014-02-20
[ [ "Nekrasov", "Anatoly K.", "" ] ]
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1402.4699
Shujia Liu
Shujia Liu
A Powerful Genetic Algorithm for Traveling Salesman Problem
5 pages, 1 figure
null
null
null
cs.NE cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a powerful genetic algorithm(GA) to solve the traveling salesman problem (TSP). To construct a powerful GA, I use edge swapping(ES) with a local search procedure to determine good combinations of building blocks of parent solutions for generating even better offspring solutions. Experimental results on well studied TSP benchmarks demonstrate that the proposed GA is competitive in finding very high quality solutions on instances with up to 16,862 cities.
[ { "created": "Wed, 19 Feb 2014 15:33:35 GMT", "version": "v1" } ]
2014-02-20
[ [ "Liu", "Shujia", "" ] ]
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A Powerful Genetic Algorithm for Traveling Salesman Problem
http://arxiv.org/abs/1402.4699v1
http://arxiv.org/pdf/1402.4699v1.pdf
https://github.com/sugia/GA-for-TSP
true
true
https://paperswithcode.com/paper/a-powerful-genetic-algorithm-for-traveling
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1402.4700
J{\o}rgen Kjoshagen Tr{\o}mborg
J{\o}rgen Kjoshagen Tr{\o}mborg, Henrik Andersen Sveinsson, Julien Scheibert, Kjetil Th{\o}gersen, David Sk{\aa}lid Amundsen and Anders Malthe-S{\o}renssen
Slow slip and the transition from fast to slow fronts in the rupture of frictional interfaces
35 pages, 5 primary figures, 6 supporting figures. Post-print version with improvements from review process included
PNAS, 2014, vol. 111, no. 24, pp. 8764-8769
10.1073/pnas.1321752111
null
cond-mat.soft physics.class-ph physics.geo-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The failure of the population of micro-junctions forming the frictional interface between two solids is central to fields ranging from biomechanics to seismology. This failure is mediated by the propagation along the interface of various types of rupture fronts, covering a wide range of velocities. Among them are so-called slow fronts, which are recently discovered fronts much slower than the materials' sound speeds. Despite intense modelling activity, the mechanisms underlying slow fronts remain elusive. Here, we introduce a multi-scale model capable of reproducing both the transition from fast to slow fronts in a single rupture event and the short-time slip dynamics observed in recent experiments. We identify slow slip immediately following the arrest of a fast front as a phenomenon sufficient for the front to propagate further at a much slower pace. Whether slow fronts are actually observed is controlled both by the interfacial stresses and by the width of the local distribution of forces among micro-junctions. Our results show that slow fronts are qualitatively different from faster fronts. Since the transition from fast to slow fronts is potentially as generic as slow slip, we anticipate that it might occur in the wide range of systems in which slow slip has been reported, including seismic faults.
[ { "created": "Wed, 19 Feb 2014 15:33:37 GMT", "version": "v1" }, { "created": "Fri, 20 Jun 2014 14:14:23 GMT", "version": "v2" } ]
2014-06-23
[ [ "Trømborg", "Jørgen Kjoshagen", "" ], [ "Sveinsson", "Henrik Andersen", "" ], [ "Scheibert", "Julien", "" ], [ "Thøgersen", "Kjetil", "" ], [ "Amundsen", "David Skålid", "" ], [ "Malthe-Sørenssen", "Anders", "" ] ]
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1402.4702
Nitin Rawat Mr
Nitin Rawat, Pavel Ni, Rajesh Kumar
A Fast Compressive Sensing Based Digital Image Encryption Technique using Structurally Random Matrices and Arnold Transform
13 pages
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new digital image encryption method based on fast compressed sensing approach using structurally random matrices and Arnold transform is proposed. Considering the natural images to be compressed in any domain, the fast compressed sensing based approach saves computational time, increases the quality of the image and reduces the dimension of the digital image by choosing even 25 % of the measurements. First, dimension reduction is utilized to compress the digital image with scrambling effect. Second, Arnold transformation is used to give the reduced digital image into more complex form. Then, the complex image is again encrypted by double random phase encoding process embedded with a host image; two random keys with fractional Fourier transform are been used as a secret keys. At the receiver, the decryption process is recovered by using TwIST algorithm. Experimental results including peak-to-peak signal-to-noise ratio between the original and reconstructed image are shown to analyze the validity of this technique and demonstrated our proposed method to be secure, fast, complex and robust.
[ { "created": "Thu, 13 Feb 2014 08:18:15 GMT", "version": "v1" } ]
2014-02-20
[ [ "Rawat", "Nitin", "" ], [ "Ni", "Pavel", "" ], [ "Kumar", "Rajesh", "" ] ]
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1402.4707
Dmitry N. Kozlov
Dmitry N. Kozlov
Standard protocol complexes for the immediate snapshot read/write model
null
null
null
null
cs.DC math.AT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we consider a family of abstract simplicial complexes which we call immediate snapshot complexes. Their definition is motivated by theoretical distributed computing. Specifically, these complexes appear as protocol complexes in the general immediate snapshot execution model. In order to define and to analyze the immediate snapshot complexes we use the novel language of witness structures. We develop the rigorous mathematical theory of witness structures and use it to prove several combinatorial as well as topological properties of the immediate snapshot complexes. In particular, we prove that these complexes are simplicially homeomorphic to simplices.
[ { "created": "Wed, 19 Feb 2014 15:51:48 GMT", "version": "v1" } ]
2014-02-20
[ [ "Kozlov", "Dmitry N.", "" ] ]
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1402.4717
Mykhaylo Dubov
Huseyin Karakuzu, Mykhaylo Dubov, Sonia Boscolo, Leonid A.Melnikov, Yulia A. Mazhirina
Optimisation of microstructured waveguides in z-cut LiNbO3 crystals
12 pages; 9 figures; to be submitted to Optical Material Express
null
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a practical approach to the numerical optimisation of the guiding properties of buried microstructured waveguides, which can be fabricated in a z-cut lithium niobate (LiNbO3) crystal by the method of direct femtosecond laser inscription. We demonstrate the possibility to extend the spectral range of low-loss operation of the waveguide into the mid-infrared region beyond 3{\mu}m.
[ { "created": "Wed, 19 Feb 2014 16:23:58 GMT", "version": "v1" } ]
2014-02-20
[ [ "Karakuzu", "Huseyin", "" ], [ "Dubov", "Mykhaylo", "" ], [ "Boscolo", "Sonia", "" ], [ "Melnikov", "Leonid A.", "" ], [ "Mazhirina", "Yulia A.", "" ] ]
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1402.4718
Bart M. P. Jansen
Bart M. P. Jansen
Turing Kernelization for Finding Long Paths and Cycles in Restricted Graph Classes
39 pages, 8 figures
J. Comput. Syst. Sci. vol 85 pages 18--37, 2017
10.1016/j.jcss.2016.10.008
null
cs.DS cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The NP-complete $k$-Path problem asks whether a given undirected graph has a (simple) path of length at least $k$. We prove that $k$-Path has polynomial-size Turing kernels when restricted to planar graphs, graphs of bounded degree, claw-free graphs, or to $K_{3,t}$-minor-free graphs for some constant $t$. This means that there is an algorithm that, given a $k$-Path instance $(G,k)$ belonging to one of these graph classes, computes its answer in polynomial time when given access to an oracle that solves $k$-Path instances of size polynomial in $k$ in a single step. The difficulty of $k$-Path can therefore be confined to subinstances whose size is independent of the total input size, but is bounded by a polynomial in the parameter $k$ alone. These results contrast existing superpolynomial lower bounds for the sizes of traditional kernels for the $k$-Path problem on these graph classes: there is no polynomial-time algorithm that reduces any instance $(G,k)$ to a single, equivalent instance $(G',k')$ of size polynomial in $k$ unless $NP \subseteq coNP/poly$. The same positive and negative results apply to the $k$-Cycle problem, which asks for the existence of a cycle of length at least $k$. Our kernelization schemes are based on a new methodology called Decompose-Query-Reduce.
[ { "created": "Wed, 19 Feb 2014 16:26:30 GMT", "version": "v1" }, { "created": "Fri, 29 Jan 2016 09:51:07 GMT", "version": "v2" } ]
2017-04-21
[ [ "Jansen", "Bart M. P.", "" ] ]
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1402.4722
Guilherme D. da Fonseca
Guilherme D. da Fonseca, Vin\'icius G. Pereira de S\'a and Celina M. H. de Figueiredo
Shifting coresets: obtaining linear-time approximations for unit disk graphs and other geometric intersection graphs
An extended abstract of this paper appeared in the 12th Workshop on Approximation and Online Algorithms (WAOA), part of ALGO~2014. The journal version will appear at International Journal of Computational Geometry and Applications
WAOA 2014, LNCS 8952:132-143, 2015
10.1007/978-3-319-18263-6_12
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Numerous approximation algorithms for problems on unit disk graphs have been proposed in the literature, exhibiting a sharp trade-off between running times and approximation ratios. We introduce a variation of the known shifting strategy that allows us to obtain linear-time constant-factor approximation algorithms for such problems. To illustrate the applicability of the proposed variation, we obtain results for three well-known optimization problems. Among such results, the proposed method yields linear-time (4+eps)-approximation for the maximum-weight independent set and the minimum dominating set of unit disk graphs, thus bringing significant performance improvements when compared to previous algorithms that achieve the same approximation ratios. Finally, we use axis-aligned rectangles to illustrate that the same method may be used to derive linear-time approximations for problems on other geometric intersection graph classes.
[ { "created": "Wed, 19 Feb 2014 16:30:04 GMT", "version": "v1" }, { "created": "Mon, 5 May 2014 16:29:04 GMT", "version": "v2" }, { "created": "Thu, 4 Sep 2014 09:27:54 GMT", "version": "v3" }, { "created": "Thu, 17 Dec 2015 10:30:45 GMT", "version": "v4" }, { "created": "Sat, 5 Nov 2016 11:11:18 GMT", "version": "v5" } ]
2016-11-08
[ [ "da Fonseca", "Guilherme D.", "" ], [ "de Sá", "Vinícius G. Pereira", "" ], [ "de Figueiredo", "Celina M. H.", "" ] ]
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1402.4724
Onintra Poobrasert
Onintra Poobrasert and Waragorn Gestubtim
Breaking Barriers: Assistive Technology Tool as Educational Software to support Writing
9 pages. IJCA 2013
null
null
null
cs.HC cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The preliminary report by Siriraj Hospital suggested that 6% of population who are students in Thailand could be estimated to have learning disabilities. It is therefore necessary for our institute to develop suitable ICT technologies to assist the education of these learning disabilities children. We therefore developed a program called Thai Word Prediction Program. Thai Word Prediction program aims to assist students with learning disabilities in their writing. After the usability engineering, we conducted the experiment with students with learning disabilities at the School in Bangkok. Hence, the results indicated that all three students with learning disabilities in this study improved their ability of writing by 50%, 81.89% and 100% respectively.
[ { "created": "Wed, 19 Feb 2014 16:36:58 GMT", "version": "v1" } ]
2014-02-20
[ [ "Poobrasert", "Onintra", "" ], [ "Gestubtim", "Waragorn", "" ] ]
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1402.4726
Younes Ra'di
Inigo Liberal, Younes Ra'di, Ramon Gonzalo, Inigo Ederra, Sergei A. Tretyakov and Richard W. Ziolkowski
Least Upper Bounds of the Powers Extracted and Scattered by Bi-anisotropic Particles
9 pages, 1 figures
null
10.1109/TAP.2014.2330620
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The least upper bounds of the powers extracted and scattered by bi-anisotropic particles are investigated analytically. A rigorous derivation for particles having invertible polarizability tensors is presented, and the particles with singular polarizability tensors that have been reported in the literature are treated explicitly. The analysis concludes that previous upper bounds presented for isotropic particles can be extrapolated to bi-anisotropic particles. In particular, it is shown that neither nonreciprocal nor magnetoelectric coupling phenomena can further increase those upper bounds on the extracted and scattered powers. The outcomes are illustrated further with approximate circuit model examples of two dipole antennas connected via a generic lossless network.
[ { "created": "Thu, 13 Feb 2014 08:02:14 GMT", "version": "v1" } ]
2015-06-18
[ [ "Liberal", "Inigo", "" ], [ "Ra'di", "Younes", "" ], [ "Gonzalo", "Ramon", "" ], [ "Ederra", "Inigo", "" ], [ "Tretyakov", "Sergei A.", "" ], [ "Ziolkowski", "Richard W.", "" ] ]
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1402.4729
Ravi Tandon
SaiDhiraj Amuru, Ravi Tandon, Shlomo Shamai (Shitz)
On the Degrees-of-freedom of the 3-user MISO Broadcast Channel with Hybrid CSIT
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The 3-user multiple-input single-output (MISO) broadcast channel (BC) with hybrid channel state information at the transmitter (CSIT) is considered. In this framework, there is perfect and instantaneous CSIT from a subset of users and delayed CSIT from the remaining users. We present new results on the degrees of freedom (DoF) of the 3-user MISO BC with hybrid CSIT. In particular, for the case of 2 transmit antennas, we show that with perfect CSIT from one user and delayed CSIT from the remaining two users, the optimal DoF is 5/3. For the case of 3 transmit antennas and the same hybrid CSIT setting, it is shown that a higher DoF of 9/5 is achievable and this result improves upon the best known bound. Furthermore, with 3 transmit antennas, and the hybrid CSIT setting in which there is perfect CSIT from two users and delayed CSIT from the third one, a novel scheme is presented which achieves 9/4 DoF. Our results also reveal new insights on how to utilize hybrid channel knowledge for multi-user scenarios.
[ { "created": "Wed, 19 Feb 2014 16:54:21 GMT", "version": "v1" } ]
2014-02-20
[ [ "Amuru", "SaiDhiraj", "", "Shitz" ], [ "Tandon", "Ravi", "", "Shitz" ], [ "Shamai", "Shlomo", "", "Shitz" ] ]
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1402.4732
Thomas Lasko
Thomas A. Lasko
Efficient Inference of Gaussian Process Modulated Renewal Processes with Application to Medical Event Data
8 pages, 4 figures
null
null
VU-DBMI-2014-01-001
stat.ML cs.LG stat.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The episodic, irregular and asynchronous nature of medical data render them difficult substrates for standard machine learning algorithms. We would like to abstract away this difficulty for the class of time-stamped categorical variables (or events) by modeling them as a renewal process and inferring a probability density over continuous, longitudinal, nonparametric intensity functions modulating that process. Several methods exist for inferring such a density over intensity functions, but either their constraints and assumptions prevent their use with our potentially bursty event streams, or their time complexity renders their use intractable on our long-duration observations of high-resolution events, or both. In this paper we present a new and efficient method for inferring a distribution over intensity functions that uses direct numeric integration and smooth interpolation over Gaussian processes. We demonstrate that our direct method is up to twice as accurate and two orders of magnitude more efficient than the best existing method (thinning). Importantly, the direct method can infer intensity functions over the full range of bursty to memoryless to regular events, which thinning and many other methods cannot. Finally, we apply the method to clinical event data and demonstrate the face-validity of the abstraction, which is now amenable to standard learning algorithms.
[ { "created": "Wed, 19 Feb 2014 17:09:14 GMT", "version": "v1" } ]
2014-02-20
[ [ "Lasko", "Thomas A.", "" ] ]
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1402.4738
Richard Fredlund M
Richard M Fredlund
A measure of compression gain for new symbols in data-compression
7 pages, 0 figures
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Huffman encoding is often improved by using block codes, for example a 3-block would be an alphabet consisting of each possible combination of three characters. We take the approach of starting with a base alphabet and expanding it to include frequently occurring aggregates of symbols. We prove that the change in compressed message length by the introduction of a new aggregate symbol can be expressed as the difference of two entropies, dependent only on the probabilities and length of the introduced symbol. The expression is independent of the probability of all other symbols in the alphabet. This measure of information gain, for a new symbol, can be applied in data compression methods. We also demonstrate that aggregate symbol alphabets, as opposed to mutually exclusive alphabets have the potential to provide good levels of compression, with a simple experiment. Finally, compression gain as defined in this paper may also be useful for feature selection.
[ { "created": "Wed, 19 Feb 2014 17:38:52 GMT", "version": "v1" }, { "created": "Sun, 6 Nov 2016 10:30:34 GMT", "version": "v2" } ]
2016-11-08
[ [ "Fredlund", "Richard M", "" ] ]
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1402.4740
Genki Ichinose
Genki Ichinose and Hiroki Sayama
Evolution of Fairness in the Not Quite Ultimatum Game
14 pages, 3 figures
Scientific Reports 4, 5104, 2014
10.1038/srep05104
null
physics.soc-ph cs.GT q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Ultimatum Game (UG) is an economic game where two players (proposer and responder) decide how to split a certain amount of money. While traditional economic theories based on rational decision making predict that the proposer should make a minimal offer and the responder should accept it, human subjects tend to behave more fairly in UG. Previous studies suggested that extra information such as reputation, empathy, or spatial structure is needed for fairness to evolve in UG. Here we show that fairness can evolve without additional information if players make decisions probabilistically and may continue interactions when the offer is rejected, which we call the Not Quite Ultimatum Game (NQUG). Evolutionary simulations of NQUG showed that the probabilistic decision making contributes to the increase of proposers' offer amounts to avoid rejection, while the repetition of the game works to responders' advantage because they can wait until a good offer comes. These simple extensions greatly promote evolution of fairness in both proposers' offers and responders' acceptance thresholds.
[ { "created": "Wed, 19 Feb 2014 17:51:48 GMT", "version": "v1" }, { "created": "Wed, 14 May 2014 01:26:02 GMT", "version": "v2" } ]
2017-04-06
[ [ "Ichinose", "Genki", "" ], [ "Sayama", "Hiroki", "" ] ]
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1402.4741
Julio Lemos
Julio Lemos
A normative account of defeasible and probabilistic inference
null
Intuitio 6 (2), 2013, pp. 211-219
null
null
cs.LO cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we provide more evidence for the contention that logical consequence should be understood in normative terms. Hartry Field and John MacFarlane covered the classical case. We extend their work, examining what it means for an agent to be obliged to infer a conclusion when faced with uncertain information or reasoning within a non-monotonic, defeasible, logical framework (which allows e. g. for inference to be drawn from premises considered true unless evidence to the contrary is presented).
[ { "created": "Wed, 19 Feb 2014 17:52:00 GMT", "version": "v1" } ]
2014-02-20
[ [ "Lemos", "Julio", "" ] ]
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1402.4742
Sarah Emery Bunn
Markus Demleitner, Patrick Dowler, Ray Plante, Guy Rixon and Mark Taylor
IVOA Recommendation: TAPRegExt: a VOResource Schema Extension for Describing TAP Services
null
null
10.5479/ADS/bib/2012ivoa.spec.0827D
REC-TAPRegExt-1.0-20120827
astro-ph.IM cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This document describes an XML encoding standard for metadata about services implementing the table access protocol TAP [TAP], referred to as TAPRegExt. Instance documents are part of the service's registry record or can be obtained from the service itself. They deliver information to both humans and software on the languages, output formats, and upload methods supported by the service, as well as data models implemented by the exposed tables, optional language features, and certain limits enforced by the service.
[ { "created": "Wed, 19 Feb 2014 17:52:34 GMT", "version": "v1" } ]
2019-05-22
[ [ "Demleitner", "Markus", "" ], [ "Dowler", "Patrick", "" ], [ "Plante", "Ray", "" ], [ "Rixon", "Guy", "" ], [ "Taylor", "Mark", "" ] ]
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1402.4743
Nigel Badnell
N. R. Badnell and C. P. Ballance
Electron-impact excitation of Fe$^{2+}$: a comparison of intermediate coupling frame transformation, Breit-Pauli and Dirac R-matrix calculations
Ap.J. In Press. (5 pages, 2 figures.)
null
10.1088/0004-637X/785/2/99
null
astro-ph.GA physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Modeling the spectral emission of low-charge iron group ions enables the diagnostic determination of the local physical conditions of many cool plasma environments such as those found in H II regions, planetary nebulae, active galactic nuclei etc. Electron-impact excitation drives the population of the emitting levels and, hence, their emissivities. By carrying-out Breit-Pauli and intermediate coupling frame transformation (ICFT) R-matrix calculations for the electron-impact excitation of Fe$^{2+}$ which both use the exact same atomic structure and the same close-coupling expansion, we demonstrate the validity of the application of the powerful ICFT method to low-charge iron group ions. This is in contradiction to the finding of Bautista et al. [Ap.J.Lett, 718, L189, (2010)] who carried-out ICFT and Dirac R-matrix calculations for the same ion. We discuss possible reasons.
[ { "created": "Wed, 19 Feb 2014 17:54:51 GMT", "version": "v1" } ]
2015-06-18
[ [ "Badnell", "N. R.", "" ], [ "Ballance", "C. P.", "" ] ]
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1402.4746
Ananda Theertha Suresh
Jayadev Acharya, Ashkan Jafarpour, Alon Orlitsky, Ananda Theertha Suresh
Near-optimal-sample estimators for spherical Gaussian mixtures
null
null
null
null
cs.LG cs.DS cs.IT math.IT stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Statistical and machine-learning algorithms are frequently applied to high-dimensional data. In many of these applications data is scarce, and often much more costly than computation time. We provide the first sample-efficient polynomial-time estimator for high-dimensional spherical Gaussian mixtures. For mixtures of any $k$ $d$-dimensional spherical Gaussians, we derive an intuitive spectral-estimator that uses $\mathcal{O}_k\bigl(\frac{d\log^2d}{\epsilon^4}\bigr)$ samples and runs in time $\mathcal{O}_{k,\epsilon}(d^3\log^5 d)$, both significantly lower than previously known. The constant factor $\mathcal{O}_k$ is polynomial for sample complexity and is exponential for the time complexity, again much smaller than what was previously known. We also show that $\Omega_k\bigl(\frac{d}{\epsilon^2}\bigr)$ samples are needed for any algorithm. Hence the sample complexity is near-optimal in the number of dimensions. We also derive a simple estimator for one-dimensional mixtures that uses $\mathcal{O}\bigl(\frac{k \log \frac{k}{\epsilon} }{\epsilon^2} \bigr)$ samples and runs in time $\widetilde{\mathcal{O}}\left(\bigl(\frac{k}{\epsilon}\bigr)^{3k+1}\right)$. Our other technical contributions include a faster algorithm for choosing a density estimate from a set of distributions, that minimizes the $\ell_1$ distance to an unknown underlying distribution.
[ { "created": "Wed, 19 Feb 2014 17:59:55 GMT", "version": "v1" } ]
2014-02-20
[ [ "Acharya", "Jayadev", "" ], [ "Jafarpour", "Ashkan", "" ], [ "Orlitsky", "Alon", "" ], [ "Suresh", "Ananda Theertha", "" ] ]
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1402.4748
Leon Abdillah
Leon Andretti Abdillah
Managing information and knowledge sharing cultures in higher educations institutions
The 11th International Research Conference on Quality, Innovation, and Knowledge Management (QIK2014); L. A. Abdillah, "Managing information and knowledge sharing cultures in higher educations institutions," in The 11th International Research Conference on QIK, The Trans Luxury Hotel, Bandung, Indonesia, 2014
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cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Information and knowledge (IK) are very important for any institution including education higher institution. Those IK are stored in every single individual in organization in the form of experiences, skills, etc. The growth of the higher education institution nowadays relies on how an institution manage the dissemination of those IK over the organization by using information technology (IT). This article discusses several ways and tools for engaging persons in the organization to build sharing cultures. This article gives some view of freely availabe application over internet to be used for IK sharing cultures.
[ { "created": "Wed, 19 Feb 2014 18:06:33 GMT", "version": "v1" } ]
2014-02-20
[ [ "Abdillah", "Leon Andretti", "" ] ]
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1402.4750
Sarah Emery Bunn
Patrick Dowler, Markus Demleitner, Mark Taylor, Doug Tody
IVOA Recommendation: DALI: Data Access Layer Interface Version 1.0
null
null
10.5479/ADS/bib/2013ivoa.spec.1129D
REC-DALI-1.0-20131129
astro-ph.IM cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This document describes the Data Access Layer Interface (DALI). DALI defines the base web service interface common to all Data Access Layer (DAL) services. This standard defines the behaviour of common resources, the meaning and use of common parameters, success and error responses, and DAL service registration. The goal of this specification is to define the common elements that are shared across DAL services in order to foster consistency across concrete DAL service specifications and to enable standard re-usable client and service implementations and libraries to be written and widely adopted.
[ { "created": "Wed, 19 Feb 2014 18:08:44 GMT", "version": "v1" } ]
2019-05-22
[ [ "Dowler", "Patrick", "" ], [ "Demleitner", "Markus", "" ], [ "Taylor", "Mark", "" ], [ "Tody", "Doug", "" ] ]
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1402.4758
Robert Green II
Rachel Householder, Scott Arnold, and Robert Green
On Cloud-based Oversubscription
7 pages, 3 figures
International Journal of Engineering Trends and Technology(IJETT), V8(8),425-431 February 2014. ISSN:2231-5381
10.14445/22315381/IJETT-V8P273
null
cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Rising trends in the number of customers turning to the cloud for their computing needs has made effective resource allocation imperative for cloud service providers. In order to maximize profits and reduce waste, providers have started to explore the role of oversubscribing cloud resources. However, the benefits of cloud-based oversubscription are not without inherent risks. This paper attempts to unveil the incentives, risks, and techniques behind oversubscription in a cloud infrastructure. Additionally, an overview of the current research that has been completed on this highly relevant topic is reviewed, and suggestions are made regarding potential avenues for future work.
[ { "created": "Wed, 19 Feb 2014 18:25:54 GMT", "version": "v1" }, { "created": "Wed, 5 Mar 2014 16:15:00 GMT", "version": "v2" } ]
2014-03-06
[ [ "Householder", "Rachel", "" ], [ "Arnold", "Scott", "" ], [ "Green", "Robert", "" ] ]
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1402.4767
Cale Gentry
Cale M. Gentry and Milos A. Popovic
Dark state lasers
null
null
10.1364/OL.39.004136
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a new type of laser resonator based on imaginary "energy-level splitting" (imaginary coupling, or quality factor Q splitting) in a pair of coupled microcavities. A particularly advantageous arrangement involves two microring cavities with different free-spectral ranges (FSRs) in a configuration wherein they are coupled by "far-field" interference in a shared radiation channel. A novel Vernier-like effect for laser resonators is designed where only one longitudinal resonant mode has a lower loss than the small signal gain and can achieve lasing while all other modes are suppressed. This configuration enables ultra-widely tunable single-frequency lasers based on either homogeneously or inhomogeneously broadened gain media. The concept is an alternative to the common external cavity configurations for achieving tunable single-mode operation in a laser. The proposed laser concept builds on a high-Q "dark state" that is established by radiative interference coupling and bears a direct analogy to parity-time (PT) symmetric Hamiltonians in optical systems. Variants of this concept should be extendable to parametric-gain based oscillators, enabling use of ultrabroadband parametric gain for widely tunable single-frequency light sources.
[ { "created": "Wed, 19 Feb 2014 18:56:19 GMT", "version": "v1" } ]
2016-11-25
[ [ "Gentry", "Cale M.", "" ], [ "Popovic", "Milos A.", "" ] ]
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null
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1402.4769
Sparisoma Viridi
Sparisoma Viridi, Mitra Djamal, Yusaku Fujii
Lup-Like Cantilever Beam for Small Deflection
10 pages, 3 figures
null
null
null
physics.ins-det
http://creativecommons.org/licenses/by-nc-sa/3.0/
A lup-like cantilever beam are discussed in this work. For small deflection it can be approximated as a spring-mass system with certain spring constant whose effective mass is larger than the usual constant rectangular cross section cantilever beam. A new parameter $\beta$ is introduced to relates some the properties of lup-like cantilever beam to the usual one. Influence of beam witdh $B_0$ and head width $B_t$ to value of $\beta$ is also presented.
[ { "created": "Wed, 19 Feb 2014 19:03:32 GMT", "version": "v1" }, { "created": "Sun, 23 Feb 2014 17:56:55 GMT", "version": "v2" } ]
2014-02-25
[ [ "Viridi", "Sparisoma", "" ], [ "Djamal", "Mitra", "" ], [ "Fujii", "Yusaku", "" ] ]
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1402.4778
Jan Bergstra
Jan A. Bergstra and Peter Weijland
Bitcoin: a Money-like Informational Commodity
null
null
null
Report TCS 1402
cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The question "what is Bitcoin" allows for many answers depending on the objectives aimed at when providing such answers. The question addressed in this paper is to determine a top-level classification, or type, for Bitcoin. We will classify Bitcoin as a system of type money-like informational commodity (MLIC).
[ { "created": "Wed, 19 Feb 2014 19:25:15 GMT", "version": "v1" } ]
2014-02-20
[ [ "Bergstra", "Jan A.", "" ], [ "Weijland", "Peter", "" ] ]
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1402.4783
Matteo Smerlak
Matteo Smerlak, Brady Stoll, Agam Gupta, James S. Magdanz
Mapping systemic risk: critical degree and failures distribution in financial networks
19 pages, 4 figures
PLoS ONE 10(7): e0130948 (2015)
10.1371/journal.pone.0130948
null
q-fin.GN physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The 2008 financial crisis illustrated the need for a thorough, functional understanding of systemic risk in strongly interconnected financial structures. Dynamic processes on complex networks being intrinsically difficult, most recent studies of this problem have relied on numerical simulations. Here we report analytical results in a network model of interbank lending based on directly relevant financial parameters, such as interest rates and leverage ratios. Using a mean-field approach, we obtain a closed-form formula for the "critical degree", viz. the number of creditors per bank below which an individual shock can propagate throughout the network. We relate the failures distribution (probability that a single shock induces $F$ failures) to the degree distribution (probability that a bank has $k$ creditors), showing in particular that the former is fat-tailed whenever the latter is. Our criterion for the onset of contagion turns out to be isomorphic to the condition for cooperation to evolve on graphs and social networks, as recently formulated in evolutionary game theory. This remarkable connection supports recent calls for a methodological rapprochement between finance and ecology.
[ { "created": "Tue, 11 Feb 2014 21:58:59 GMT", "version": "v1" }, { "created": "Sat, 1 Mar 2014 20:48:54 GMT", "version": "v2" } ]
2015-08-05
[ [ "Smerlak", "Matteo", "" ], [ "Stoll", "Brady", "" ], [ "Gupta", "Agam", "" ], [ "Magdanz", "James S.", "" ] ]
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1402.4792
Alessandra Sabina Lanotte
I. M. Mazzitelli and F. Toschi and A.S. Lanotte
An accurate and efficient Lagrangian sub-grid model
null
null
10.1063/1.4894149
null
physics.flu-dyn nlin.CD
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A computationally efficient model is introduced to account for the sub-grid scale velocities of tracer particles dispersed in statistically homogeneous and isotropic turbulent flows. The model embeds the multi-scale nature of turbulent temporal and spatial correlations, that are essential to reproduce multi-particle dispersion. It is capable to describe the Lagrangian diffusion and dispersion of temporally and spatially correlated clouds of particles. Although the model neglects intermittent corrections, we show that pair and tetrad dispersion results nicely compare with Direct Numerical Simulations of statistically isotropic and homogeneous $3D$ turbulence. This is in agreement with recent observations that deviations from self-similar pair dispersion statistics are rare events.
[ { "created": "Wed, 19 Feb 2014 20:27:14 GMT", "version": "v1" } ]
2015-06-18
[ [ "Mazzitelli", "I. M.", "" ], [ "Toschi", "F.", "" ], [ "Lanotte", "A. S.", "" ] ]
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1402.4799
Hassan Zivari-Fard
Hassan Zivari-Fard, Bahareh Akhbari, Mahmoud Ahmadian-Attari, Mohammad Reza Aref
Multiple Access Channel with Common Message and Secrecy constraint
11 pages, 7 figures, Accepted in IET Communications
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we study the problem of secret communication over a multiple-access channel with a common message. Here, we assume that two transmitters have confidential messages, which must be kept secret from the wiretapper (the second receiver), and both of them have access to a common message which can be decoded by the two receivers. We call this setting as Multiple-Access Wiretap Channel with Common message (MAWC-CM). For this setting, we derive general inner and outer bounds on the secrecy capacity region for the discrete memoryless case and show that these bounds meet each other for a special case called the switch channel. As well, for a Gaussian version of MAWC-CM, we derive inner and outer bounds on the secrecy capacity region. Providing numerical results for the Gaussian case, we illustrate the comparison between the derived achievable rate region and the outer bound for the considered model and the capacity region of compound multiple access channel.
[ { "created": "Wed, 19 Feb 2014 20:42:48 GMT", "version": "v1" }, { "created": "Mon, 2 Jun 2014 12:46:30 GMT", "version": "v2" }, { "created": "Tue, 12 Jul 2016 17:27:32 GMT", "version": "v3" } ]
2016-07-13
[ [ "Zivari-Fard", "Hassan", "" ], [ "Akhbari", "Bahareh", "" ], [ "Ahmadian-Attari", "Mahmoud", "" ], [ "Aref", "Mohammad Reza", "" ] ]
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1402.4802
Lu\'is F. Seoane MSc
Ricard V. Sol\'e and Lu\'is F. Seoane
Ambiguity in language networks
19 pages, 5 figures, review and book chapter
null
null
null
physics.soc-ph cs.CL q-bio.NC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Human language defines the most complex outcomes of evolution. The emergence of such an elaborated form of communication allowed humans to create extremely structured societies and manage symbols at different levels including, among others, semantics. All linguistic levels have to deal with an astronomic combinatorial potential that stems from the recursive nature of languages. This recursiveness is indeed a key defining trait. However, not all words are equally combined nor frequent. In breaking the symmetry between less and more often used and between less and more meaning-bearing units, universal scaling laws arise. Such laws, common to all human languages, appear on different stages from word inventories to networks of interacting words. Among these seemingly universal traits exhibited by language networks, ambiguity appears to be a specially relevant component. Ambiguity is avoided in most computational approaches to language processing, and yet it seems to be a crucial element of language architecture. Here we review the evidence both from language network architecture and from theoretical reasonings based on a least effort argument. Ambiguity is shown to play an essential role in providing a source of language efficiency, and is likely to be an inevitable byproduct of network growth.
[ { "created": "Tue, 18 Feb 2014 09:26:17 GMT", "version": "v1" }, { "created": "Thu, 13 Mar 2014 15:10:40 GMT", "version": "v2" } ]
2014-03-14
[ [ "Solé", "Ricard V.", "" ], [ "Seoane", "Luís F.", "" ] ]
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1402.4824
Sergio G\'omez
Sara Teller, Clara Granell, Manlio De Domenico, Jordi Soriano, Sergio Gomez, Alex Arenas
Emergence of assortative mixing between clusters of cultured neurons
33 pages, 10 figures
PLOS Comput. Biol. 10(9) (2014) e1003796
10.1371/journal.pcbi.1003796
null
q-bio.NC cond-mat.dis-nn physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The analysis of the activity of neuronal cultures is considered to be a good proxy of the functional connectivity of in vivo neuronal tissues. Thus, the functional complex network inferred from activity patterns is a promising way to unravel the interplay between structure and functionality of neuronal systems. Here, we monitor the spontaneous self-sustained dynamics in neuronal cultures formed by interconnected aggregates of neurons (clusters). Dynamics is characterized by the fast activation of groups of clusters in sequences termed bursts. The analysis of the time delays between clusters' activations within the bursts allows the reconstruction of the directed functional connectivity of the network. We propose a method to statistically infer this connectivity and analyze the resulting properties of the associated complex networks. Surprisingly enough, in contrast to what has been reported for many biological networks, the clustered neuronal cultures present assortative mixing connectivity values, as well as a rich--club core, meaning that there is a preference for clusters to link to other clusters that share similar functional connectivity, which shapes a `connectivity backbone' in the network. These results point out that the grouping of neurons and the assortative connectivity between clusters are intrinsic survival mechanisms of the culture.
[ { "created": "Wed, 19 Feb 2014 21:05:25 GMT", "version": "v1" }, { "created": "Mon, 7 Jul 2014 19:13:46 GMT", "version": "v2" } ]
2014-09-09
[ [ "Teller", "Sara", "" ], [ "Granell", "Clara", "" ], [ "De Domenico", "Manlio", "" ], [ "Soriano", "Jordi", "" ], [ "Gomez", "Sergio", "" ], [ "Arenas", "Alex", "" ] ]
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1402.4826
Federico Maggi
Andrea Gianazza and Federico Maggi and Aristide Fattori and Lorenzo Cavallaro and Stefano Zanero
PuppetDroid: A User-Centric UI Exerciser for Automatic Dynamic Analysis of Similar Android Applications
null
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Popularity and complexity of malicious mobile applications are rising, making their analysis difficult and labor intensive. Mobile application analysis is indeed inherently different from desktop application analysis: In the latter, the interaction of the user (i.e., victim) is crucial for the malware to correctly expose all its malicious behaviors. We propose a novel approach to analyze (malicious) mobile applications. The goal is to exercise the user interface (UI) of an Android application to effectively trigger malicious behaviors, automatically. Our key intuition is to record and reproduce the UI interactions of a potential victim of the malware, so as to stimulate the relevant behaviors during dynamic analysis. To make our approach scale, we automatically re-execute the recorded UI interactions on apps that are similar to the original ones. These characteristics make our system orthogonal and complementary to current dynamic analysis and UI-exercising approaches. We developed our approach and experimentally shown that our stimulation allows to reach a higher code coverage than automatic UI exercisers, so to unveil interesting malicious behaviors that are not exposed when using other approaches. Our approach is also suitable for crowdsourcing scenarios, which would push further the collection of new stimulation traces. This can potentially change the way we conduct dynamic analysis of (mobile) applications, from fully automatic only, to user-centric and collaborative too.
[ { "created": "Wed, 19 Feb 2014 21:08:11 GMT", "version": "v1" } ]
2014-02-21
[ [ "Gianazza", "Andrea", "" ], [ "Maggi", "Federico", "" ], [ "Fattori", "Aristide", "" ], [ "Cavallaro", "Lorenzo", "" ], [ "Zanero", "Stefano", "" ] ]
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1402.4827
Rui Soares Barbosa
Shane Mansfield and Rui Soares Barbosa
Extendability in the Sheaf-theoretic Approach: Construction of Bell Models from Kochen-Specker Models
18 pages, presented at Quantum Physics and Logic X - 2013 (ICFO, Barcelona), submitted to Electronic Proceedings in Theoretical Computer Science
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null
null
quant-ph cs.LO math.CT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Extendability of an empirical model was shown by Abramsky & Brandenburger to correspond in a unified manner to both locality and non-contextuality. We develop their approach by presenting a refinement of the notion of extendability that can also be useful in characterising the properties of sub-models. The refinement is found to have another useful application: it is shown that a particular canonical extension, when well-defined, may be used for the construction of Bell-type models from models of more general kinds in such a way that the constructed model is equivalent to the original in terms of non-locality/contextuality. This is important since on practical and foundational levels, the notion of locality in Bell-type models can more easily be motivated than the corresponding general notion of contextuality. We consider examples of Bell-type models generated from some standard examples of contextual models, including an entire class of Kochen-Specker-like models. This exposes an intriguing relationship between the simplest possible contextual model (the contextual triangle) and Popescu-Rohrlich no-signalling correlations.
[ { "created": "Wed, 19 Feb 2014 21:09:34 GMT", "version": "v1" } ]
2014-02-21
[ [ "Mansfield", "Shane", "" ], [ "Barbosa", "Rui Soares", "" ] ]
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1402.4834
Mir Ehsan Hesam Sadati
Mir Ehsan Hesam Sadati, Jamshid Bagherzadeh Mohasefi
The Application of Imperialist Competitive Algorithm for Fuzzy Random Portfolio Selection Problem
5 pages, 2 tables, Published with International Journal of Computer Applications (IJCA)
International Journal of Computer Applications 79(9):10-14, October 2013
10.5120/13767-1618
null
math.OC cs.AI
http://creativecommons.org/licenses/by/3.0/
This paper presents an implementation of the Imperialist Competitive Algorithm (ICA) for solving the fuzzy random portfolio selection problem where the asset returns are represented by fuzzy random variables. Portfolio Optimization is an important research field in modern finance. By using the necessity-based model, fuzzy random variables reformulate to the linear programming and ICA will be designed to find the optimum solution. To show the efficiency of the proposed method, a numerical example illustrates the whole idea on implementation of ICA for fuzzy random portfolio selection problem.
[ { "created": "Wed, 19 Feb 2014 21:37:17 GMT", "version": "v1" } ]
2014-02-21
[ [ "Sadati", "Mir Ehsan Hesam", "" ], [ "Mohasefi", "Jamshid Bagherzadeh", "" ] ]
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null
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1402.4835
Mohammad Farazmand
Mohammad Farazmand and George Haller
How coherent are the vortices of two-dimensional turbulence?
revised version
null
null
null
math.DS physics.flu-dyn physics.geo-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use recent developments in the theory of finite-time dynamical systems to objectively locate the material boundaries of coherent vortices in two-dimensional Navier--Stokes turbulence. We show that these boundaries are optimal in the sense that any closed curve in their exterior will lose coherence under material advection. Through a detailed comparison, we find that other available Eulerian and Lagrangian techniques significantly underestimate the size of each coherent vortex.
[ { "created": "Wed, 19 Feb 2014 21:40:22 GMT", "version": "v1" }, { "created": "Fri, 27 Jun 2014 15:40:11 GMT", "version": "v2" } ]
2014-06-30
[ [ "Farazmand", "Mohammad", "" ], [ "Haller", "George", "" ] ]
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1402.4843
Aleksandar Perisic
Aleksandar Perisic
Exercise: +-1 bug and center of an array problem
18 pages
null
null
null
cs.PL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A problem that is constantly cropping up in designing even the simplest algorithm or a program is dealing with +-1 bug when we calculate positions within an array, very noticeably while splitting it in half. This bug is often found in buffer overflow type of bugs. While designing one complicated algorithm, we needed various ways of splitting an array, and we found lack of general guidance for this apparently minor problem. We present an exercise that tracks the cause of the problem and leads to the solution. This problem looks trivial because it seems obvious or insignificant, however treating it without outmost precision can lead to subtle bugs, unbalanced solution, not transparent expressions for various languages. Basically, the exercise is about dealing with <= < as well as n/2, n/2-1, (n+1)/2, n-1 and similar expressions when they are rounded down to the nearest integer and used to define a range.
[ { "created": "Wed, 19 Feb 2014 22:50:29 GMT", "version": "v1" }, { "created": "Sun, 2 Mar 2014 12:51:39 GMT", "version": "v2" }, { "created": "Wed, 5 Mar 2014 12:33:13 GMT", "version": "v3" }, { "created": "Wed, 12 Mar 2014 07:59:05 GMT", "version": "v4" }, { "created": "Fri, 21 Mar 2014 08:44:07 GMT", "version": "v5" } ]
2014-03-24
[ [ "Perisic", "Aleksandar", "" ] ]
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1402.4844
Alon Gonen
Alon Gonen, Dan Rosenbaum, Yonina Eldar, Shai Shalev-Shwartz
Subspace Learning with Partial Information
null
null
null
null
cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The goal of subspace learning is to find a $k$-dimensional subspace of $\mathbb{R}^d$, such that the expected squared distance between instance vectors and the subspace is as small as possible. In this paper we study subspace learning in a partial information setting, in which the learner can only observe $r \le d$ attributes from each instance vector. We propose several efficient algorithms for this task, and analyze their sample complexity
[ { "created": "Wed, 19 Feb 2014 22:57:03 GMT", "version": "v1" }, { "created": "Thu, 26 May 2016 14:06:50 GMT", "version": "v2" } ]
2016-05-27
[ [ "Gonen", "Alon", "" ], [ "Rosenbaum", "Dan", "" ], [ "Eldar", "Yonina", "" ], [ "Shalev-Shwartz", "Shai", "" ] ]
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1402.4845
Gionata Gelati
Jonathan Gelati and Sithan Kanna
Diffusion Least Mean Square: Simulations
null
null
null
null
cs.LG cs.MA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this technical report we analyse the performance of diffusion strategies applied to the Least-Mean-Square adaptive filter. We configure a network of cooperative agents running adaptive filters and discuss their behaviour when compared with a non-cooperative agent which represents the average of the network. The analysis provides conditions under which diversity in the filter parameters is beneficial in terms of convergence and stability. Simulations drive and support the analysis.
[ { "created": "Wed, 19 Feb 2014 22:59:14 GMT", "version": "v1" } ]
2014-02-21
[ [ "Gelati", "Jonathan", "" ], [ "Kanna", "Sithan", "" ] ]
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1402.4847
Ricard Menchon-Enrich
Ricard Menchon-Enrich, Jordi Mompart, Veronica Ahufinger
Spatial adiabatic passage processes in sonic crystals with linear defects
11 pages, 10 figures
Phys. Rev. B 89, 094304 (2014)
10.1103/PhysRevB.89.094304
null
cond-mat.mtrl-sci physics.flu-dyn quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate spatial adiabatic passage processes for sound waves propagation in sonic crystals, consisting of steel cylinders embedded in a water host medium, that present two linear defects. This work constitutes an extension of the well-known quantum optical rapid adiabatic passage technique to the field of sound propagation. Several spatial adiabatic passage devices are proposed, by appropriately designing the geometry of the two linear defects along the propagation direction, to work as a coherent multifrequency adiabatic splitter, a phase difference analyzer and a coherent multifrequency adiabatic coupler. These devices are robust in front of fluctuations of the geometric parameter values.
[ { "created": "Wed, 19 Feb 2014 23:12:39 GMT", "version": "v1" } ]
2014-04-02
[ [ "Menchon-Enrich", "Ricard", "" ], [ "Mompart", "Jordi", "" ], [ "Ahufinger", "Veronica", "" ] ]
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1402.4855
Sergio Cabello
Sergio Cabello, Miha Jej\v{c}i\v{c}
Shortest Paths in Intersection Graphs of Unit Disks
An alternative approach for the unweighted case is added to the Introduction
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null
null
cs.CG cs.DM cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $G$ be a unit disk graph in the plane defined by $n$ disks whose positions are known. For the case when $G$ is unweighted, we give a simple algorithm to compute a shortest path tree from a given source in $O(n\log n)$ time. For the case when $G$ is weighted, we show that a shortest path tree from a given source can be computed in $O(n^{1+\varepsilon})$ time, improving the previous best time bound of $O(n^{4/3+\varepsilon})$.
[ { "created": "Thu, 20 Feb 2014 00:59:45 GMT", "version": "v1" }, { "created": "Mon, 17 Nov 2014 22:43:17 GMT", "version": "v2" } ]
2014-11-19
[ [ "Cabello", "Sergio", "" ], [ "Jejčič", "Miha", "" ] ]
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1402.4857
Hui Kong
Kong Hui and Tong lianhai and Zhou yahui
Transverse ultrasonic anomaly in La1/3Sr2/3MnO3
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null
null
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physics.atm-clus cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The charge ordering (CO) transition in polycrystalline La1/3Sr2/3MnO3 has been studied by measuring the resistivity, magnetization and transverse ultrasonic velocity. At about 235K, a conspicuous increase in resistivity was observed, while the magnetization shows a cusp structure, corresponding to an antiferromagnetic charge ordering transition. Around this transition temperature, dramatic anomaly in transverse sound velocity was observed. The simultaneous occurrence of electron, magnon and phonon anomalous features implies strong spin-phonon coupling and electron-phonon in La1/3Sr2/3MnO3. The analysis suggests that the spin-phonon interaction is due to single-ion magnetostriction, and electron-phonon coupling originates from the Jahn-Teller effect of Mn3+.
[ { "created": "Thu, 20 Feb 2014 01:12:58 GMT", "version": "v1" }, { "created": "Fri, 28 Feb 2014 13:25:55 GMT", "version": "v2" } ]
2014-03-03
[ [ "Hui", "Kong", "" ], [ "lianhai", "Tong", "" ], [ "yahui", "Zhou", "" ] ]
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1402.4861
Aryan Mokhtari
Aryan Mokhtari and Alejandro Ribeiro
A Quasi-Newton Method for Large Scale Support Vector Machines
5 pages, To appear in International Conference on Acoustics, Speech, and Signal Processing (ICASSP) 2014
null
null
null
cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper adapts a recently developed regularized stochastic version of the Broyden, Fletcher, Goldfarb, and Shanno (BFGS) quasi-Newton method for the solution of support vector machine classification problems. The proposed method is shown to converge almost surely to the optimal classifier at a rate that is linear in expectation. Numerical results show that the proposed method exhibits a convergence rate that degrades smoothly with the dimensionality of the feature vectors.
[ { "created": "Thu, 20 Feb 2014 01:44:33 GMT", "version": "v1" } ]
2014-02-21
[ [ "Mokhtari", "Aryan", "" ], [ "Ribeiro", "Alejandro", "" ] ]
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1402.4862
Raja Hafiz Affandi
Raja Hafiz Affandi, Emily B. Fox, Ryan P. Adams and Ben Taskar
Learning the Parameters of Determinantal Point Process Kernels
null
null
null
null
stat.ML cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Determinantal point processes (DPPs) are well-suited for modeling repulsion and have proven useful in many applications where diversity is desired. While DPPs have many appealing properties, such as efficient sampling, learning the parameters of a DPP is still considered a difficult problem due to the non-convex nature of the likelihood function. In this paper, we propose using Bayesian methods to learn the DPP kernel parameters. These methods are applicable in large-scale and continuous DPP settings even when the exact form of the eigendecomposition is unknown. We demonstrate the utility of our DPP learning methods in studying the progression of diabetic neuropathy based on spatial distribution of nerve fibers, and in studying human perception of diversity in images.
[ { "created": "Thu, 20 Feb 2014 01:54:37 GMT", "version": "v1" } ]
2014-02-21
[ [ "Affandi", "Raja Hafiz", "" ], [ "Fox", "Emily B.", "" ], [ "Adams", "Ryan P.", "" ], [ "Taskar", "Ben", "" ] ]
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1402.4866
Lin Wang
Y. Yao, S.-S. Chen
Heterogeneous noise enhances spatial reciprocity
15pages, 4 figures
null
10.1016/j.physa.2014.06.041
null
physics.soc-ph q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent research has identified the heterogeneity as crucial for the evolution of cooperation in spatial population. However, the influence of heterogeneous noise is still lack. Inspired by this interesting question, in this work, we try to incorporate heterogeneous noise into the evaluation of utility, where only a proportion of population possesses noise, whose range can also be tuned. We find that increasing heterogeneous noise monotonously promotes cooperation and even translates the full defection phase (of the homogeneous version) into the complete cooperation phase. Moreover, the promotion effect of this mechanism can be attributed to the leading role of cooperators who have the heterogeneous noise. These type of cooperators can attract more agents penetrating into the robust cooperator clusters, which is beyond the text of traditional spatial reciprocity. We hope that our work may shed light on the understanding of the cooperative behavior in the society.
[ { "created": "Thu, 20 Feb 2014 02:24:26 GMT", "version": "v1" } ]
2015-06-18
[ [ "Yao", "Y.", "" ], [ "Chen", "S. -S.", "" ] ]
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1402.4867
Anke van Zuylen
Anke van Zuylen, James Bieron, Frans Schalekamp, Gexin Yu
An Upper Bound on the Number of Circular Transpositions to Sort a Permutation
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cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the problem of upper bounding the number of circular transpositions needed to sort a permutation. It is well known that any permutation can be sorted using at most $n(n-1)/2$ adjacent transpositions. We show that, if we allow all adjacent transpositions, as well as the transposition that interchanges the element in position 1 with the element in the last position, then the number of transpositions needed is at most $n^2/4$. This answers an open question posed by Feng, Chitturi and Sudborough (2010).
[ { "created": "Thu, 20 Feb 2014 02:26:28 GMT", "version": "v1" } ]
2014-02-21
[ [ "van Zuylen", "Anke", "" ], [ "Bieron", "James", "" ], [ "Schalekamp", "Frans", "" ], [ "Yu", "Gexin", "" ] ]
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1402.4869
Raja Jurdak
Raja Jurdak
The Impact of Cost and Network Topology on Urban Mobility: A Study of Public Bicycle Usage in 2 U.S. Cities
6 pages, 7 Figure, PLOS One
PLoS ONE 8(11): e79396
10.1371/journal.pone.0079396
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Understanding the drivers of urban mobility is vital for epidemiology, urban planning, and communication networks. Human movements have so far been studied by observing people's positions in a given space and time, though most recent models only implicitly account for expected costs and returns for movements. This paper explores the explicit impact of cost and network topology on mobility dynamics, using data from 2 city-wide public bicycle share systems in the USA. User mobility is characterized through the distribution of trip durations, while network topology is characterized through the pairwise distances between stations and the popularity of stations and routes. Despite significant differences in station density and physical layout between the 2 cities, trip durations follow remarkably similar distributions that exhibit cost sensitive trends around pricing point boundaries, particularly with long-term users of the system. Based on the results, recommendations for dynamic pricing and incentive schemes are provided to positively influence mobility patterns and guide improved planning and management of public bicycle systems to increase uptake.
[ { "created": "Thu, 20 Feb 2014 02:32:59 GMT", "version": "v1" } ]
2014-02-21
[ [ "Jurdak", "Raja", "" ] ]
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1402.4874
Yizhu Zhang
Y.H. Jiang, A. Senftleben, A. Rudenko, M. E. Madjet, O.Vendrell, M. Kurka, K. Schnorr, L. Foucar, M. K\"ubel, O. Herrwerth, M. Lezius, M.F. Kling, J. van Tilborg, A. Belkacem, K. Ueda, S. D\"usterer, R. Treusch, C.D. Schr\"oter, R. Santra, J. Ullrich, and R. Moshammer
Watching the acetylene vinylidene intramolecular reaction in real time
21 pages, 3 figures, submitted
null
null
null
physics.atm-clus
http://creativecommons.org/licenses/by-nc-sa/3.0/
It is a long-standing dream of scientists to capture the ultra-fast dynamics of molecular or chemical reactions in real time and to make a molecular movie. With free-electron lasers delivering extreme ultraviolet (XUV) light at unprecedented intensities, in combination with pump-probe schemes, it is now possible to visualize structural changes on the femtosecond time scale in photo-excited molecules. In hydrocarbons the absorption of a single photon may trigger the migration of a hydrogen atom within the molecule. Here, such a reaction was filmed in acetylene molecules (C2H2) showing a partial migration of one of the protons along the carbon backbone which is consistent with dynamics calculations on ab initio potential energy surfaces. Our approach opens attractive perspectives and potential applications for a large variety of XUV-induced ultra-fast phenomena in molecules relevant to physics, chemistry, and biology.
[ { "created": "Thu, 20 Feb 2014 03:08:24 GMT", "version": "v1" } ]
2014-02-21
[ [ "Jiang", "Y. H.", "" ], [ "Senftleben", "A.", "" ], [ "Rudenko", "A.", "" ], [ "Madjet", "M. E.", "" ], [ "Vendrell", "O.", "" ], [ "Kurka", "M.", "" ], [ "Schnorr", "K.", "" ], [ "Foucar", "L.", "" ], [ "Kübel", "M.", "" ], [ "Herrwerth", "O.", "" ], [ "Lezius", "M.", "" ], [ "Kling", "M. F.", "" ], [ "van Tilborg", "J.", "" ], [ "Belkacem", "A.", "" ], [ "Ueda", "K.", "" ], [ "Düsterer", "S.", "" ], [ "Treusch", "R.", "" ], [ "Schröter", "C. D.", "" ], [ "Santra", "R.", "" ], [ "Ullrich", "J.", "" ], [ "Moshammer", "R.", "" ] ]
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1402.4876
Ruibang Luo
Sze-Hang Chan, Jeanno Cheung, Edward Wu, Heng Wang, Chi-Man Liu, Xiaoqian Zhu, Shaoliang Peng, Ruibang Luo, Tak-Wah Lam
MICA: A fast short-read aligner that takes full advantage of Intel Many Integrated Core Architecture (MIC)
2 pages, 1 figure, 2 tables, submitted to Bioinformatics as an application note
null
null
null
cs.DC cs.CE q-bio.GN
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Background: Short-read aligners have recently gained a lot of speed by exploiting the massive parallelism of GPU. An uprising alternative to GPU is Intel MIC; supercomputers like Tianhe-2, currently top of TOP500, is built with 48,000 MIC boards to offer ~55 PFLOPS. The CPU-like architecture of MIC allows CPU-based software to be parallelized easily; however, the performance is often inferior to GPU counterparts as an MIC board contains only ~60 cores (while a GPU board typically has over a thousand cores). Results: To better utilize MIC-enabled computers for NGS data analysis, we developed a new short-read aligner MICA that is optimized in view of MICs limitation and the extra parallelism inside each MIC core. Experiments on aligning 150bp paired-end reads show that MICA using one MIC board is 4.9 times faster than the BWA-MEM (using 6-core of a top-end CPU), and slightly faster than SOAP3-dp (using a GPU). Furthermore, MICAs simplicity allows very efficient scale-up when multiple MIC boards are used in a node (3 cards give a 14.1-fold speedup over BWA-MEM). Summary: MICA can be readily used by MIC-enabled supercomputers for production purpose. We have tested MICA on Tianhe-2 with 90 WGS samples (17.47 Tera-bases), which can be aligned in an hour less than 400 nodes. MICA has impressive performance even though the current MIC is at its initial stage of development (the next generation of MIC has been announced to release in late 2014).
[ { "created": "Thu, 20 Feb 2014 03:19:50 GMT", "version": "v1" } ]
2014-02-21
[ [ "Chan", "Sze-Hang", "" ], [ "Cheung", "Jeanno", "" ], [ "Wu", "Edward", "" ], [ "Wang", "Heng", "" ], [ "Liu", "Chi-Man", "" ], [ "Zhu", "Xiaoqian", "" ], [ "Peng", "Shaoliang", "" ], [ "Luo", "Ruibang", "" ], [ "Lam", "Tak-Wah", "" ] ]
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1402.4881
Vincent Tan
Vincent Y. F. Tan and Pierre Moulin
Fixed Error Asymptotics For Erasure and List Decoding
18 pages, 1 figure; Submitted to IEEE Transactions on Information Theory; Shorter version to be presented at ISIT 2014
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We derive the optimum second-order coding rates, known as second-order capacities, for erasure and list decoding. For erasure decoding for discrete memoryless channels, we show that second-order capacity is $\sqrt{V}\Phi^{-1}(\epsilon_t)$ where $V$ is the channel dispersion and $\epsilon_t$ is the total error probability, i.e., the sum of the erasure and undetected errors. We show numerically that the expected rate at finite blocklength for erasures decoding can exceed the finite blocklength channel coding rate. We also show that the analogous result also holds for lossless source coding with decoder side information, i.e., Slepian-Wolf coding. For list decoding, we consider list codes of deterministic size that scales as $\exp(\sqrt{n}l)$ and show that the second-order capacity is $l+\sqrt{V}\Phi^{-1}(\epsilon)$ where $\epsilon$ is the permissible error probability. We also consider lists of polynomial size $n^\alpha$ and derive bounds on the third-order coding rate in terms of the order of the polynomial $\alpha$. These bounds are tight for symmetric and singular channels. The direct parts of the coding theorems leverage on the simple threshold decoder and converses are proved using variants of the hypothesis testing converse.
[ { "created": "Thu, 20 Feb 2014 03:53:29 GMT", "version": "v1" }, { "created": "Mon, 21 Apr 2014 13:29:55 GMT", "version": "v2" } ]
2014-04-22
[ [ "Tan", "Vincent Y. F.", "" ], [ "Moulin", "Pierre", "" ] ]
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1402.4888
Johnvictor D
D. Johnvictor, G. Selvavinayagam
Survey on Sparse Coded Features for Content Based Face Image Retrieval
4 pages,3 figures,1 table, Published with International Journal of Computer Trends and Technology (IJCTT)
International Journal of Computer Trends and Technology (IJCTT) 8(1):30-33, February 2014. ISSN:2231-2803
10.14445/22312803/IJCTT-V8P106
null
cs.IR cs.CV cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Content based image retrieval, a technique which uses visual contents of image to search images from large scale image databases according to users' interests. This paper provides a comprehensive survey on recent technology used in the area of content based face image retrieval. Nowadays digital devices and photo sharing sites are getting more popularity, large human face photos are available in database. Multiple types of facial features are used to represent discriminality on large scale human facial image database. Searching and mining of facial images are challenging problems and important research issues. Sparse representation on features provides significant improvement in indexing related images to query image.
[ { "created": "Thu, 20 Feb 2014 04:32:40 GMT", "version": "v1" } ]
2014-02-21
[ [ "Johnvictor", "D.", "" ], [ "Selvavinayagam", "G.", "" ] ]
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1402.4892
Kiran Thekumparampil
Kiran Koshy Thekumparampil, Andrew Thangaraj, Rahul Vaze
Sub-Modularity of Waterfilling with Applications to Online Basestation Allocation
5 pages, 2 figures; submitted to the International Symposium on Information Theory 2014
null
null
null
cs.NI cs.DS cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that the popular water-filling algorithm for maximizing the mutual information in parallel Gaussian channels is sub-modular. The sub-modularity of water-filling algorithm is then used to derive online basestation allocation algorithms, where mobile users are assigned to one of many possible basestations immediately and irrevocably upon arrival without knowing the future user information. The goal of the allocation is to maximize the sum-rate of the system under power allocation at each basestation. We present online algorithms with competitive ratio of at most 2 when compared to offline algorithms that have knowledge of all future user arrivals.
[ { "created": "Thu, 20 Feb 2014 05:12:00 GMT", "version": "v1" } ]
2014-02-21
[ [ "Thekumparampil", "Kiran Koshy", "" ], [ "Thangaraj", "Andrew", "" ], [ "Vaze", "Rahul", "" ] ]
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1402.4893
Xianping Li
Xianping Li
Anisotropic Mesh Adaptation for Image Representation
25 pages, 15 figures
null
null
null
cs.CV math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Triangular meshes have gained much interest in image representation and have been widely used in image processing. This paper introduces a framework of anisotropic mesh adaptation (AMA) methods to image representation and proposes a GPRAMA method that is based on AMA and greedy-point removal (GPR) scheme. Different than many other methods that triangulate sample points to form the mesh, the AMA methods start directly with a triangular mesh and then adapt the mesh based on a user-defined metric tensor to represent the image. The AMA methods have clear mathematical framework and provides flexibility for both image representation and image reconstruction. A mesh patching technique is developed for the implementation of the GPRAMA method, which leads to an improved version of the popular GPRFS-ED method. The GPRAMA method can achieve better quality than the GPRFS-ED method but with lower computational cost.
[ { "created": "Thu, 20 Feb 2014 05:15:22 GMT", "version": "v1" }, { "created": "Mon, 1 Jun 2015 23:08:06 GMT", "version": "v2" }, { "created": "Mon, 30 Nov 2015 03:03:29 GMT", "version": "v3" }, { "created": "Tue, 29 Mar 2016 19:10:35 GMT", "version": "v4" } ]
2016-03-30
[ [ "Li", "Xianping", "" ] ]
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1402.4899
Carl Blair
L Ju, C Zhao, D G Blair, S Susmithan, Q Fang and C D Blair
Three Mode Interactions as a Precision Monitoring Tool for Advanced Laser Interferometers
8 pages, 4 figures
null
10.1088/0264-9381/31/18/185003
null
physics.optics
http://creativecommons.org/licenses/by/3.0/
Three-mode opto-acoustic interactions in advanced laser interferometer gravitational wave detectors have high sensitivity to thermally excited ultrasonic modes in their test masses. Three mode interaction signal gain can change by 100% for thermally induced radius of curvature variations ~ 10-5, allowing the monitoring of thermal distortions corresponding to wavefront changes ~2 x 10-13m. We show that the three-mode gain for single cavity interactions can be monitored by observing beat signals in the transmitted or reflected light due to the thermal excitation of the many hundreds of detectable acoustic modes. We show that three mode interaction signals can be used at low optical power to predict parametric instabilities that could occur at higher power. In addition, at any power, the observed mode amplitudes can be used to control the interferometer operating point against slow environmental perturbations. We summarize data on an 80m cavity that demonstrates these effects and propose testing on full scale interferometer cavities to evaluate whether the technique has practical benefits that can be extended from single cavities to dual recycling interferometers.
[ { "created": "Thu, 20 Feb 2014 05:37:53 GMT", "version": "v1" } ]
2015-06-18
[ [ "Ju", "L", "" ], [ "Zhao", "C", "" ], [ "Blair", "D G", "" ], [ "Susmithan", "S", "" ], [ "Fang", "Q", "" ], [ "Blair", "C D", "" ] ]
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1402.4904
Eric Olaf Potma
Steven Yampolsky, Dmitry A. Fishman, Shirshendu Dey, Eero Hulkko, Mayukh Banik, Eric O. Potma, Vartkess A. Apkarian
Seeing the vibrational breathing of a single molecule through time-resolved coherent anti-Stokes Raman scattering
17 pages, 5 figures
null
null
null
physics.chem-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The motion of chemical bonds within molecules can be observed in real time, in the form of vibrational wavepackets prepared and interrogated through ultrafast nonlinear spectroscopy. Such nonlinear optical measurements are commonly performed on large ensembles of molecules, and as such, are limited to the extent that ensemble coherence can be maintained. Here, we describe vibrational wavepacket motion on single molecules, recorded through time-resolved, surface-enhanced, coherent anti-Stokes Raman scattering. The required sensitivity to detect the motion of a single molecule, under ambient conditions, is achieved by equipping the molecule with a dipolar nano-antenna (a gold dumbbell). In contrast with measurements in ensembles, the vibrational coherence on a single molecule does not dephase. It develops phase fluctuations with characteristic statistics. We present the time evolution of discretely sampled statistical states, and highlight the unique information content in the characteristic, early-time probability distribution function of the signal.
[ { "created": "Thu, 20 Feb 2014 06:16:59 GMT", "version": "v1" } ]
2014-02-21
[ [ "Yampolsky", "Steven", "" ], [ "Fishman", "Dmitry A.", "" ], [ "Dey", "Shirshendu", "" ], [ "Hulkko", "Eero", "" ], [ "Banik", "Mayukh", "" ], [ "Potma", "Eric O.", "" ], [ "Apkarian", "Vartkess A.", "" ] ]
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1402.4906
Oded Hod
Tamar Zelovich, Leeor Kronik, and Oded Hod
A State Representation Approach for Atomistic Time-Dependent Transport Calculations in Molecular Junctions
30 pages, 6 figures
J. Chem. Theory Comput. 10, 2927-2941 (2014)
null
null
cond-mat.mes-hall physics.chem-ph physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a new method for simulating electron dynamics in open quantum systems out of equilibrium, using a finite atomistic model. The proposed method is motivated by the intuitive and practical nature of the driven Liouville von-Neumann equation approach of S\'anchez et al. [J. Chem. Phys., 124, 214708 (2006)]. A key ingredient of our approach is a transformation of the Hamiltonian matrix from an atomistic to a state representation of the molecular junction. This allows us to uniquely define the bias voltage across the system while maintaining a proper thermal electronic distribution within the finite lead models. Furthermore, it allows us to investigate complex molecular junctions, including non-linear setups and multi-lead configurations. A heuristic derivation of our working equation leads to explicit expressions for the damping and driving terms, which serve as appropriate electron sources and sinks that effectively "open" the finite model system. Although the method does not forbid it, in practice we find neither violation of Pauli's exclusion principles nor deviation from density matrix positivity throughout our numerical simulations of various tight-binding model systems. We believe that the new approach offers a practical and physically sound route for performing atomistic time-dependent transport calculations in realistic molecular junctions.
[ { "created": "Thu, 20 Feb 2014 06:19:19 GMT", "version": "v1" } ]
2014-09-23
[ [ "Zelovich", "Tamar", "" ], [ "Kronik", "Leeor", "" ], [ "Hod", "Oded", "" ] ]
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1402.4907
Carlos Alberto Lara-Alvarez
Leonardo Romero and Carlos Lara
Line Maps in Cluttered Environments
Advances in Artificial Intelligence Lecture Notes in Computer Science Volume 6437, 2010, pp 154-165
null
null
null
cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper uses the smoothing and mapping framework to solve the SLAM problem in indoor environments; focusing on how some key issues such as feature extraction and data association can be handled by applying probabilistic techniques. For feature extraction, an odds ratio approach to find multiple lines from laser scans is proposed, this criterion allows to decide which model must be merged and to output the best number of models. In addition, to solve the data association problem a method based on the segments of each line is proposed. Experimental results show that high quality indoor maps can be obtained from noisy data
[ { "created": "Thu, 20 Feb 2014 06:28:01 GMT", "version": "v1" } ]
2014-02-21
[ [ "Romero", "Leonardo", "" ], [ "Lara", "Carlos", "" ] ]
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null
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1402.4910
Subhasish Dutta Gupta
K. Nireekshan Reddy and S. Dutta Gupta
Gap solitons with null-scattering
null
null
10.1364/OL.39.002254
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study excitation of gap solitons under the conditions of coherent perfect absorption (CPA). Our system consists of a symmetric periodic structure with alternating Kerr nonlinear and linear layers, illuminated from both the ends. We show near-total transfer of incident light energy into the gap solitons resulting in null-scattering. We also report on the nonlinear super-scattering (SS) states. Both the CPA and the SS states are shown to be characterized by typical field distributions. Both the exact and the approximate results (based on nonlinear characteristic matrix method) are presented, which show good agreement.
[ { "created": "Thu, 20 Feb 2014 06:56:43 GMT", "version": "v1" } ]
2015-06-18
[ [ "Reddy", "K. Nireekshan", "" ], [ "Gupta", "S. Dutta", "" ] ]
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1402.4914
Vikash Mansinghka
Vikash Mansinghka and Eric Jonas
Building fast Bayesian computing machines out of intentionally stochastic, digital parts
6 figures
null
null
null
cs.AI cs.AR stat.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The brain interprets ambiguous sensory information faster and more reliably than modern computers, using neurons that are slower and less reliable than logic gates. But Bayesian inference, which underpins many computational models of perception and cognition, appears computationally challenging even given modern transistor speeds and energy budgets. The computational principles and structures needed to narrow this gap are unknown. Here we show how to build fast Bayesian computing machines using intentionally stochastic, digital parts, narrowing this efficiency gap by multiple orders of magnitude. We find that by connecting stochastic digital components according to simple mathematical rules, one can build massively parallel, low precision circuits that solve Bayesian inference problems and are compatible with the Poisson firing statistics of cortical neurons. We evaluate circuits for depth and motion perception, perceptual learning and causal reasoning, each performing inference over 10,000+ latent variables in real time - a 1,000x speed advantage over commodity microprocessors. These results suggest a new role for randomness in the engineering and reverse-engineering of intelligent computation.
[ { "created": "Thu, 20 Feb 2014 07:17:03 GMT", "version": "v1" } ]
2014-02-21
[ [ "Mansinghka", "Vikash", "" ], [ "Jonas", "Eric", "" ] ]
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1402.4917
Kyongwan Kim
Kyongwan Kim, Andrew L. Liao, Aurelien Sikora, Daniel Oliveira, Hikaru Nakazawa, Mitsuo Umetsu, Izumi Kumagai, Tadafumi Adschiri, Wonmuk Hwangb and Winfried Teizer
Microtubule shuttles on kinesin-coated glass micro-wire tracks
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q-bio.BM physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Gliding of microtubule filaments on surfaces coated with the motor protein kinesin has potential applications for nano-scale devices. The ability to guide the gliding direction in three dimensions allows the fabrication of tracks of arbitrary geometry in space. Here, we achieve this by using kinesin-coated glass wires of micrometer diameter range. Unlike previous methods in which the guiding tracks are fixed on flat two-dimensional surfaces, the flexibility of glass wires in shape and size facilitates building in-vitro devices that have deformable tracks.
[ { "created": "Thu, 20 Feb 2014 07:39:29 GMT", "version": "v1" } ]
2014-02-21
[ [ "Kim", "Kyongwan", "" ], [ "Liao", "Andrew L.", "" ], [ "Sikora", "Aurelien", "" ], [ "Oliveira", "Daniel", "" ], [ "Nakazawa", "Hikaru", "" ], [ "Umetsu", "Mitsuo", "" ], [ "Kumagai", "Izumi", "" ], [ "Adschiri", "Tadafumi", "" ], [ "Hwangb", "Wonmuk", "" ], [ "Teizer", "Winfried", "" ] ]
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1402.4926
Amer Mouawad
Amer E. Mouawad, Naomi Nishimura, Venkatesh Raman, Sebastian Siebertz
Vertex Cover Reconfiguration and Beyond
null
null
null
null
cs.CC cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the Vertex Cover Reconfiguration (VCR) problem, given a graph $G$, positive integers $k$ and $\ell$ and two vertex covers $S$ and $T$ of $G$ of size at most $k$, we determine whether $S$ can be transformed into $T$ by a sequence of at most $\ell$ vertex additions or removals such that every operation results in a vertex cover of size at most $k$. Motivated by results establishing the W[1]-hardness of VCR when parameterized by $\ell$, we delineate the complexity of the problem restricted to various graph classes. In particular, we show that VCR remains W[1]-hard on bipartite graphs, is NP-hard, but fixed-parameter tractable on (regular) graphs of bounded degree and more generally on nowhere dense graphs and is solvable in polynomial time on trees and (with some additional restrictions) on cactus graphs.
[ { "created": "Thu, 20 Feb 2014 08:24:29 GMT", "version": "v1" }, { "created": "Thu, 26 Oct 2017 16:00:28 GMT", "version": "v2" }, { "created": "Wed, 9 Dec 2020 19:02:07 GMT", "version": "v3" } ]
2020-12-11
[ [ "Mouawad", "Amer E.", "" ], [ "Nishimura", "Naomi", "" ], [ "Raman", "Venkatesh", "" ], [ "Siebertz", "Sebastian", "" ] ]
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1402.4929
Asen Iliev
Asen Petkov Iliev
Formal Description of Components in Operating Systems
null
IJITEE (ISSN: 2278 - 3075, Volume-3, Issue-4, September 2013) 96 - 98
null
null
cs.OS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The contemporary development of hardware components is a prerequisite for increasing the concentration of computing power. System software is developing at a much slower pace. To use available resources efficiently modeling is required. Formalization of elements, present in the material, provides the basis for modeling. Examples are presented to demonstrate the efficiency of the concept.
[ { "created": "Thu, 20 Feb 2014 08:33:02 GMT", "version": "v1" } ]
2014-02-21
[ [ "Iliev", "Asen Petkov", "" ] ]
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1402.4930
Zhyrair Gevorkian
Zhyrair Gevorkian and Vladimir Gasparian
Plasmon Enhanced Faraday Rotation in Thin Films
14pages, 2 figures
Phys.Rev.A 89,023830,(2014)
10.1103/PhysRevA.89.023830
null
cond-mat.mes-hall physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have analyzed analytically the Faraday rotation of an electromagnetic wave for magnetoactive thin metallic film with a nanostructured surface profile. Periodical as well as random surface profiles were considered. The plasmon contribution to the Faraday angle was studied. For periodical grating case, we have shown that the maximum of rotation angle is achieved when surface plasmon wave number coincides with one of the wave numbers of the inverse lattice. Enhancement of the Faraday angle at plasmonic band edges is predicted. In the case of random surface profile, it is shown that the diffusion of surface magnetoplasmons gives a dominant contribution to Faraday rotation. Comparison with the experiments is carried out.
[ { "created": "Thu, 20 Feb 2014 08:34:00 GMT", "version": "v1" } ]
2014-02-21
[ [ "Gevorkian", "Zhyrair", "" ], [ "Gasparian", "Vladimir", "" ] ]
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1402.4933
Ankit Kaushik
Ankit Kaushik, Friedrich K. Jondral
On the Estimation of Channel State Transitions for Cognitive Radio Systems
6 pages
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Coexistence by means of shared access is a cognitive radio application. The secondary user models the slotted primary users channel access as a Markov process. The model parameters, i.e, the state transition probabilities (alpha,beta) help secondary user to determine the channel occupancy, thereby enables secondary user to rank the primary user channels. These parameters are unknown and need to be estimated by secondary users for each channel. To do so, the secondary users have to sense all the primary user channels in every time slot, which is unrealistic for a large and sparsely allocated primary user spectrum. With no other choice left, the secondary user has to sense a channel at random time intervals and estimate the parametric information for all the channels using the observed slots.
[ { "created": "Thu, 20 Feb 2014 08:40:41 GMT", "version": "v1" } ]
2014-02-21
[ [ "Kaushik", "Ankit", "" ], [ "Jondral", "Friedrich K.", "" ] ]
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1402.4936
Ayman Bahaa-Eldin
Amira Mohammad Abdel-Mawgoud Saleh
Enhanced Secure Algorithm for Fingerprint Recognition
PhD Thesis, Ain Shams University, 2011
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Fingerprint recognition requires a minimal effort from the user, does not capture other information than strictly necessary for the recognition process, and provides relatively good performance. A critical step in fingerprint identification system is thinning of the input fingerprint image. The performance of a minutiae extraction algorithm relies heavily on the quality of the thinning algorithm. So, a fast fingerprint thinning algorithm is proposed. The algorithm works directly on the gray-scale image as binarization of fingerprint causes many spurious minutiae and also removes many important features. The performance of the thinning algorithm is evaluated and experimental results show that the proposed thinning algorithm is both fast and accurate. A new minutiae-based fingerprint matching technique is proposed. The main idea is that each fingerprint is represented by a minutiae table of just two columns in the database. The number of different minutiae types (terminations and bifurcations) found in each track of a certain width around the core point of the fingerprint is recorded in this table. Each row in the table represents a certain track, in the first column, the number of terminations in each track is recorded, in the second column, the number of bifurcations in each track is recorded. The algorithm is rotation and translation invariant, and needs less storage size. Experimental results show that recognition accuracy is 98%, with Equal Error Rate (EER) of 2%. Finally, the integrity of the data transmission via communication channels must be secure all the way from the scanner to the application. After applying Gaussian noise addition, and JPEG compression with high and moderate quality factors on the watermarked fingerprint images, recognition accuracy decreases slightly to reach 96%.
[ { "created": "Thu, 20 Feb 2014 09:19:17 GMT", "version": "v1" } ]
2014-02-21
[ [ "Saleh", "Amira Mohammad Abdel-Mawgoud", "" ] ]
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1402.4938
Christopher Rennick
C. J. Rennick, J. Lam, W. G. Doherty, and T. P. Softley
Magnetic Trapping of Cold Bromine Atoms
null
Phys. Rev. Lett. 112 (2014) 023002
10.1103/PhysRevLett.112.023002
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Magnetic trapping of bromine atoms at temperatures in the milliKelvin regime is demonstrated for the first time. The atoms are produced by photodissociation of Br$_2$ molecules in a molecular beam. The lab-frame velocity of Br atoms is controlled by the wavelength and polarization of the photodissociation laser. Careful selection of the wavelength results in one of the pair of atoms having sufficient velocity to exactly cancel that of the parent molecule, and it remains stationary in the lab frame. A trap is formed at the null point between two opposing neodymium permanent magnets. Dissociation of molecules at the field minimum results in the slowest fraction of photofragments remaining trapped. After the ballistic escape of the fastest atoms, the trapped slow atoms are only lost by elastic collisions with the chamber background gas. The measured loss rate is consistent with estimates of the total cross section for only those collisions transferring sufficient kinetic energy to overcome the trapping potential.
[ { "created": "Thu, 20 Feb 2014 09:27:16 GMT", "version": "v1" } ]
2014-02-21
[ [ "Rennick", "C. J.", "" ], [ "Lam", "J.", "" ], [ "Doherty", "W. G.", "" ], [ "Softley", "T. P.", "" ] ]
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1402.4943
Alessandro Olmi
G.Pasquali, G.Pastore, N.Le Neindre, G.Ademard, S.Barlini, M.Bini, E.Bonnet, B.Borderie, R.Bougault, M.Bruno, G.Casini, A.Chbihi, M.Cinausero, J.A.Duenas, P.Edelbruck, J.D.Frankland, F.Gramegna, D.Gruyer, A.Kordyasz, T.Kozik, O.Lopez, T.Marchi, L.Morelli, A.Olmi, A.Ordine, M.Parlog, S.Piantelli, G.Poggi, M.F.Rivet, E.Rosato, F.Salomon, G.Spadaccini, A.A.Stefanini, S.Valdre, E.Vient, T.Twarog, R.Alba, C.Maiolino, and D.Santonocito
Energy measurement and fragment identification using digital signals from partially depleted Si detectors
13 pages, 10 figures 5 tables; submitted to European Physical Journal A
Eur. Phys. J. A 50 (2014) 86
10.1140/epja/i2014-14086-9
null
physics.ins-det nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A study of identification properties of a Si-Si DE-E telescope exploiting an underdepleted residual-energy detector has been performed. Five different bias voltages have been used, one corresponding to full depletion, the others associated with a depleted layer ranging from 90% to 60% of the detector thickness. Fragment identification has been performed using either the DE-E technique or Pulse Shape Analysis (PSA). Both detectors are reverse mounted: particles enter from the low field side, to enhance the PSA performance. The achieved charge and mass resolution has been quantitatively expressed using a Figure of Merit (FoM). Charge collection efficiency has been evaluated and the possibility of energy calibration corrections has been considered. We find that the DE-E performance is not affected by incomplete depletion even when only 60% of the wafer is depleted. Isotopic separation capability improves at lower bias voltages with respect to full depletion, though charge identification thresholds are higher than at full depletion. Good isotopic identification via PSA has been obtained from a partially depleted detector whose doping uniformity is not good enough for isotopic identification at full depletion.
[ { "created": "Thu, 20 Feb 2014 09:57:27 GMT", "version": "v1" } ]
2014-06-18
[ [ "Pasquali", "G.", "" ], [ "Pastore", "G.", "" ], [ "Neindre", "N. Le", "" ], [ "Ademard", "G.", "" ], [ "Barlini", "S.", "" ], [ "Bini", "M.", "" ], [ "Bonnet", "E.", "" ], [ "Borderie", "B.", "" ], [ "Bougault", "R.", "" ], [ "Bruno", "M.", "" ], [ "Casini", "G.", "" ], [ "Chbihi", "A.", "" ], [ "Cinausero", "M.", "" ], [ "Duenas", "J. A.", "" ], [ "Edelbruck", "P.", "" ], [ "Frankland", "J. D.", "" ], [ "Gramegna", "F.", "" ], [ "Gruyer", "D.", "" ], [ "Kordyasz", "A.", "" ], [ "Kozik", "T.", "" ], [ "Lopez", "O.", "" ], [ "Marchi", "T.", "" ], [ "Morelli", "L.", "" ], [ "Olmi", "A.", "" ], [ "Ordine", "A.", "" ], [ "Parlog", "M.", "" ], [ "Piantelli", "S.", "" ], [ "Poggi", "G.", "" ], [ "Rivet", "M. F.", "" ], [ "Rosato", "E.", "" ], [ "Salomon", "F.", "" ], [ "Spadaccini", "G.", "" ], [ "Stefanini", "A. A.", "" ], [ "Valdre", "S.", "" ], [ "Vient", "E.", "" ], [ "Twarog", "T.", "" ], [ "Alba", "R.", "" ], [ "Maiolino", "C.", "" ], [ "Santonocito", "D.", "" ] ]
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1402.4946
Asrar Ahmed
Asrar Ahmed and Kamalakar Karlapalem
Inequity aversion and the evolution of cooperation
null
Physical Review E (89) (2) (2014) 022802
10.1103/PhysRevE.89.022802
null
cs.GT physics.soc-ph q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Evolution of cooperation is a widely studied problem in biology, social science, economics, and artificial intelligence. Most of the existing approaches that explain cooperation rely on some notion of direct or indirect reciprocity. These reciprocity based models assume agents recognize their partner and know their previous interactions, which requires advanced cognitive abilities. In this paper we are interested in developing a model that produces cooperation without requiring any explicit memory of previous game plays. Our model is based on the notion of, a concept introduced within behavioral economics, whereby individuals care about payoff equality in outcomes. Here we explore the effect of using income inequality to guide partner selection and interaction. We study our model by considering both the well-mixed and the spatially structured population and present the conditions under which cooperation becomes dominant. Our results support the hypothesis that inequity aversion promotes cooperative relationship among nonkin.
[ { "created": "Thu, 20 Feb 2014 10:07:08 GMT", "version": "v1" } ]
2014-02-21
[ [ "Ahmed", "Asrar", "" ], [ "Karlapalem", "Kamalakar", "" ] ]
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1402.4950
Kees Middelburg
J. A. Bergstra, C. A. Middelburg
On algorithmic equivalence of instruction sequences for computing bit string functions
27 pages, the preliminaries have textual overlaps with the preliminaries in arXiv:1308.0219 [cs.PL], arXiv:1312.1529 [cs.PL], and arXiv:1312.1812 [cs.PL]; 27 pages, three paragraphs about Milner's algorithmic equivalence hypothesis added to concluding remarks; 26 pages, several minor improvements of the presentation made
Fundamenta Informaticae, 138(4):411--434, 2015
10.3233/FI-2015-1219
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Every partial function from bit strings of a given length to bit strings of a possibly different given length can be computed by a finite instruction sequence that contains only instructions to set and get the content of Boolean registers, forward jump instructions, and a termination instruction. We look for an equivalence relation on instruction sequences of this kind that captures to a reasonable degree the intuitive notion that two instruction sequences express the same algorithm.
[ { "created": "Thu, 20 Feb 2014 10:21:52 GMT", "version": "v1" }, { "created": "Sun, 6 Apr 2014 15:02:58 GMT", "version": "v2" }, { "created": "Thu, 5 Feb 2015 15:23:34 GMT", "version": "v3" } ]
2015-07-28
[ [ "Bergstra", "J. A.", "" ], [ "Middelburg", "C. A.", "" ] ]
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1402.4955
Gudrun Wanner
Gudrun Wanner, Gerhard Heinzel
Analytical description of interference between two misaligned and mismatched complete Gaussian beams
8 pages, 2 figures
Appl. Opt. 53, 3043-3048 (2014)
10.1364/AO.53.003043
null
physics.optics physics.comp-ph physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A typical application for laser interferometers is a precision measurement of length changes that result in interferometric phase shifts. Such phase changes are typically predicted numerically, due to the com- plexity of the overlap integral that needs to be solved. In this paper we will derive analytical representations of the interferometric phase and contrast (aka. fringe visibility) for two beam interferometers, both homodyne and heterodyne. The fundamental Gaussian beams can be arbitrarily misaligned and mismatched to each other. A limitation of the analytical result is that both beams must be detected completely, which can experimentally be realized by a sufficiently large single-element photodetector.
[ { "created": "Thu, 20 Feb 2014 10:49:44 GMT", "version": "v1" } ]
2014-06-06
[ [ "Wanner", "Gudrun", "" ], [ "Heinzel", "Gerhard", "" ] ]
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1402.4957
Uriel Frisch
Uriel Frisch and Barbara Villone
Cauchy's almost forgotten Lagrangian formulation of the Euler equation for 3D incompressible flow
23 pages, 6 figures, EPJ H (history), in press
Eur. Phys. J. H vol. 39, pp. 325-351 (2014)
10.1140/epjh/e2014-50016-6
null
math.HO math.AP physics.hist-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Two prized papers, one by Augustin Cauchy in 1815, presented to the French Academy and the other by Hermann Hankel in 1861, presented to G\"ottingen University, contain major discoveries on vorticity dynamics whose impact is now quickly increasing. Cauchy found a Lagrangian formulation of 3D ideal incompressible flow in terms of three invariants that generalize to three dimensions the now well-known law of conservation of vorticity along fluid particle trajectories for two-dimensional flow. This has very recently been used to prove analyticity in time of fluid particle trajectories for 3D incompressible Euler flow and can be extended to compressible flow, in particular to cosmological dark matter. Hankel showed that Cauchy's formulation gives a very simple Lagrangian derivation of the Helmholtz vorticity-flux invariants and, in the middle of the proof, derived an intermediate result which is the conservation of the circulation of the velocity around a closed contour moving with the fluid. This circulation theorem was to be rediscovered independently by William Thomson (Kelvin) in 1869. Cauchy's invariants were only occasionally cited in the 19th century --- besides Hankel, foremost by George Stokes and Maurice L\'evy --- and even less so in the 20th until they were rediscovered via Emmy Noether's theorem in the late 1960, but reattributed to Cauchy only at the end of the 20th century by Russian scientists.
[ { "created": "Thu, 20 Feb 2014 10:52:56 GMT", "version": "v1" }, { "created": "Wed, 25 Jun 2014 06:48:43 GMT", "version": "v2" }, { "created": "Fri, 12 Sep 2014 12:29:29 GMT", "version": "v3" } ]
2014-09-29
[ [ "Frisch", "Uriel", "" ], [ "Villone", "Barbara", "" ] ]
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1402.4958
Dan Dobre Dan Dobre
Elli Androulaki, Christian Cachin, Dan Dobre, Marko Vukolic
Erasure-Coded Byzantine Storage with Separate Metadata
null
null
null
null
cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Although many distributed storage protocols have been introduced, a solution that combines the strongest properties in terms of availability, consistency, fault-tolerance, storage complexity and the supported level of concurrency, has been elusive for a long time. Combining these properties is difficult, especially if the resulting solution is required to be efficient and incur low cost. We present AWE, the first erasure-coded distributed implementation of a multi-writer multi-reader read/write storage object that is, at the same time: (1) asynchronous, (2) wait-free, (3) atomic, (4) amnesic, (i.e., with data nodes storing a bounded number of values) and (5) Byzantine fault-tolerant (BFT) using the optimal number of nodes. Furthermore, AWE is efficient since it does not use public-key cryptography and requires data nodes that support only reads and writes, further reducing the cost of deployment and ownership of a distributed storage solution. Notably, AWE stores metadata separately from $k$-out-of-$n$ erasure-coded fragments. This enables AWE to be the first BFT protocol that uses as few as $2t+k$ data nodes to tolerate $t$ Byzantine nodes, for any $k \ge 1$.
[ { "created": "Thu, 20 Feb 2014 10:53:07 GMT", "version": "v1" } ]
2014-02-21
[ [ "Androulaki", "Elli", "" ], [ "Cachin", "Christian", "" ], [ "Dobre", "Dan", "" ], [ "Vukolic", "Marko", "" ] ]
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1402.4963
Julius Hannink
Julius Hannink, Remco Duits and Erik Bekkers
Vesselness via Multiple Scale Orientation Scores
9 pages, 8 figures
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The multi-scale Frangi vesselness filter is an established tool in (retinal) vascular imaging. However, it cannot cope with crossings or bifurcations, since it only looks for elongated structures. Therefore, we disentangle crossing structures in the image via (multiple scale) invertible orientation scores. The described vesselness filter via scale-orientation scores performs considerably better at enhancing vessels throughout crossings and bifurcations than the Frangi version. Both methods are evaluated on a public dataset. Performance is measured by comparing ground truth data to the segmentation results obtained by basic thresholding and morphological component analysis of the filtered images.
[ { "created": "Thu, 20 Feb 2014 11:06:35 GMT", "version": "v1" }, { "created": "Thu, 27 Feb 2014 18:30:55 GMT", "version": "v2" }, { "created": "Tue, 4 Mar 2014 12:33:37 GMT", "version": "v3" }, { "created": "Mon, 19 May 2014 09:20:06 GMT", "version": "v4" } ]
2014-05-20
[ [ "Hannink", "Julius", "" ], [ "Duits", "Remco", "" ], [ "Bekkers", "Erik", "" ] ]
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1402.4968
Alexander Severin
Alexander Severin
On some possible features of motion of a polaron in gyrotropic medium
null
null
null
null
physics.chem-ph cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We predict the possibility of asymmetric dynamics of polaron in gyrotropic medium and give approximate quantitative estimate of the effect.
[ { "created": "Thu, 20 Feb 2014 11:13:55 GMT", "version": "v1" }, { "created": "Mon, 8 Dec 2014 10:09:53 GMT", "version": "v2" } ]
2014-12-09
[ [ "Severin", "Alexander", "" ] ]
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1402.4970
Saikat Banerjee
Saikat Banerjee and Jonathan Furtado and Biman Bagchi
Fluctuating micro-heterogeneity in water - tert-butyl alcohol mixtures and lambda-type divergence of the mean cluster size with phase transition-like multiple anomalies
12 pages, 12 figures
null
10.1063/1.4874637
null
cond-mat.soft cond-mat.stat-mech physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Water - tert-butyl alcohol (TBA) binary mixture exhibits a large number of thermodynamic and dynamic anomalies. These anomalies are observed at surprisingly low TBA mole fraction, with $x_{\text{TBA}} \approx 0.03 - 0.07$. We demonstrate here that the origin of the anomalies lies in the local structural changes that occur due to self-aggregation of TBA molecules. We observe a percolation transition of the TBA molecules at $x_{\text{TBA}} \approx 0.05$. We note that "islands" of TBA clusters form even below this mole fraction, while a large spanning cluster emerges above that mole fraction. At this percolation threshold, we observe a lambda-type divergence in the fluctuation of the size of the largest TBA cluster, reminiscent of a critical point. Alongside, the structure of water is also perturbed, albeit weakly, by the aggregation of TBA molecules. There is a monotonic decrease in the tetrahedral order parameter of water, while the dipole moment correlation shows a weak non-linearity. Interestingly, water molecules themselves exhibit a reverse percolation transition at higher TBA concentration, $x_{\text{TBA}} \approx 0.45$, where large spanning water clusters now break-up into small clusters. This is accompanied by significant divergence of the fluctuations in the size of largest water cluster. This second transition gives rise to another set of anomalies around. Both the percolation transitions can be regarded as manifestations of Janus effect at small molecular level.
[ { "created": "Thu, 20 Feb 2014 11:28:02 GMT", "version": "v1" } ]
2015-06-18
[ [ "Banerjee", "Saikat", "" ], [ "Furtado", "Jonathan", "" ], [ "Bagchi", "Biman", "" ] ]
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1402.4986
Gang Mei
Gang Mei and Hong Tian
Performance Impact of Data Layout on the GPU-accelerated IDW Interpolation
Preprint version for reviewing. 9 pages
SpringerPlus.2016, 5:104
10.1186/s40064-016-1731-6
null
cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper focuses on evaluating the performance impact of different data layouts on the GPU-accelerated IDW interpolation. First, we redesign and improve our previous GPU implementation that was performed by exploiting the feature CUDA Dynamic Parallel (CDP). And then, we implement three versions of GPU implementations, i.e., the naive version, the tiled version, and the improved CDP version, based on five layouts including the Structure of Arrays (SoA), the Array of Sturcutes (AoS), the Array of aligned Sturcutes (AoaS), the Structure of Arrays of aligned Structures (SoAoS), and the Hybrid layout. Experimental results show that: the layouts AoS and AoaS achieve better performance than the layout SoA for both the naive version and tiled version, while the layout SoA is the best choice for the improved CDP version. We also observe that: for the two combined data layouts (the SoAoS and the Hybrid), there are no notable performance gains when compared to other three basic layouts. We recommend that: in practical applications, the layout AoaS is the best choice since the tiled version is the fastest one among the three versions of GPU implementations, especially on single precision.
[ { "created": "Thu, 20 Feb 2014 12:44:09 GMT", "version": "v1" } ]
2016-02-03
[ [ "Mei", "Gang", "" ], [ "Tian", "Hong", "" ] ]
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1402.4994
Fabian Fuchs
Fabian Fuchs, Dorothea Wagner
Arbitrary Transmission Power in the SINR Model: Local Broadcasting, Coloring and MIS
Improved Runtime of Local Broadcasting by a factor of \Gamma^\alpha
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the light of energy conservation and the expansion of existing networks, wireless networks face the challenge of nodes with heterogeneous transmission power. However, for more realistic models of wireless communication only few algorithmic results are known. In this paper we consider nodes with arbitrary, possibly variable, transmission power in the so-called physical or SINR model. Our first result is a bound on the probabilistic interference from all simultaneously transmitting nodes on receivers. This result implies that current local broadcasting algorithms can be generalized to the case of non-uniform transmission power with minor changes. The algorithms run in $\O(\Gamma^{2} \Delta \log n)$ time slots if the maximal degree $\Delta$ is known, and $\O((\Delta + \log n)\Gamma^{2} \log n)$ otherwise, where $\Gamma$ is the ratio between the maximal and the minimal transmission range. The broad applicability of our result on bounding the interference is further highlighted, by generalizing a distributed coloring algorithm to this setting.
[ { "created": "Thu, 20 Feb 2014 13:37:45 GMT", "version": "v1" }, { "created": "Mon, 28 Apr 2014 16:04:23 GMT", "version": "v2" } ]
2014-04-29
[ [ "Fuchs", "Fabian", "" ], [ "Wagner", "Dorothea", "" ] ]
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1402.4995
Petr Novotn\'y
Tom\'a\v{s} Br\'azdil, David Kla\v{s}ka, Anton\'in Ku\v{c}era, Petr Novotn\'y
Minimizing Running Costs in Consumption Systems
32 pages, corrections of typos and minor omissions
null
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A standard approach to optimizing long-run running costs of discrete systems is based on minimizing the mean-payoff, i.e., the long-run average amount of resources ("energy") consumed per transition. However, this approach inherently assumes that the energy source has an unbounded capacity, which is not always realistic. For example, an autonomous robotic device has a battery of finite capacity that has to be recharged periodically, and the total amount of energy consumed between two successive charging cycles is bounded by the capacity. Hence, a controller minimizing the mean-payoff must obey this restriction. In this paper we study the controller synthesis problem for consumption systems with a finite battery capacity, where the task of the controller is to minimize the mean-payoff while preserving the functionality of the system encoded by a given linear-time property. We show that an optimal controller always exists, and it may either need only finite memory or require infinite memory (it is decidable in polynomial time which of the two cases holds). Further, we show how to compute an effective description of an optimal controller in polynomial time. Finally, we consider the limit values achievable by larger and larger battery capacity, show that these values are computable in polynomial time, and we also analyze the corresponding rate of convergence. To the best of our knowledge, these are the first results about optimizing the long-run running costs in systems with bounded energy stores.
[ { "created": "Thu, 20 Feb 2014 13:42:09 GMT", "version": "v1" }, { "created": "Mon, 24 Mar 2014 15:50:33 GMT", "version": "v2" } ]
2014-03-25
[ [ "Brázdil", "Tomáš", "" ], [ "Klaška", "David", "" ], [ "Kučera", "Antonín", "" ], [ "Novotný", "Petr", "" ] ]
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