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1401.1381
Ming Liu
Ming Liu (IETR), Jean-Fran\c{c}ois H\'elard (IETR), Matthieu Crussi\`ere (IETR), Maryline H\'elard (IETR)
Reduced-complexity maximum-likelihood decoding for 3D MIMO code
IEEE Wireless Communications and Networking Conference (WCNC 2013), Shanghai : China (2013)
null
10.1109/WCNC.2013.6555219
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The 3D MIMO code is a robust and efficient space-time coding scheme for the distributed MIMO broadcasting. However, it suffers from the high computational complexity if the optimal maximum-likelihood (ML) decoding is used. In this paper we first investigate the unique properties of the 3D MIMO code and consequently propose a simplified decoding algorithm without sacrificing the ML optimality. Analysis shows that the decoding complexity is reduced from O(M^8) to O(M^{4.5}) in quasi-static channels when M-ary square QAM constellation is used. Moreover, we propose an efficient implementation of the simplified ML decoder which achieves a much lower decoding time delay compared to the classical sphere decoder with Schnorr-Euchner enumeration.
[ { "created": "Tue, 7 Jan 2014 13:52:37 GMT", "version": "v1" } ]
2014-01-08
[ [ "Liu", "Ming", "", "IETR" ], [ "Hélard", "Jean-François", "", "IETR" ], [ "Crussière", "Matthieu", "", "IETR" ], [ "Hélard", "Maryline", "", "IETR" ] ]
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1401.1393
Hideki Tsuiki
Hideki Tsuiki (Graduate School of Human and Environmental Studies, Kyoto University), Yasuyuki Tsukamoyo (Graduate School of Human and Environmental Studies, Kyoto University)
Domain Representations Induced by Dyadic Subbases
null
Logical Methods in Computer Science, Volume 11, Issue 1 (March 31, 2015) lmcs:1175
10.2168/LMCS-11(1:17)2015
null
math.GN cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study domain representations induced by dyadic subbases and show that a proper dyadic subbase S of a second-countable regular space X induces an embedding of X in the set of minimal limit elements of a subdomain D of $\{0,1,\perp\}\omega$. In particular, if X is compact, then X is a retract of the set of limit elements of D.
[ { "created": "Tue, 7 Jan 2014 14:13:26 GMT", "version": "v1" }, { "created": "Thu, 17 Apr 2014 13:46:53 GMT", "version": "v2" }, { "created": "Mon, 19 May 2014 13:41:05 GMT", "version": "v3" }, { "created": "Sun, 22 Jun 2014 07:51:11 GMT", "version": "v4" }, { "created": "Mon, 30 Mar 2015 07:53:49 GMT", "version": "v5" } ]
2016-08-08
[ [ "Tsuiki", "Hideki", "", "Graduate School of Human and Environmental Studies,\n Kyoto University" ], [ "Tsukamoyo", "Yasuyuki", "", "Graduate School of Human and\n Environmental Studies, Kyoto University" ] ]
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1401.1399
Zdenek Dvorak
Zdenek Dvorak and Robin Thomas
List-coloring apex-minor-free graphs
48 pages, 5 figures; expanded version taking into account referee comments
null
null
null
cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A graph H is t-apex if H-X is planar for some subset X of V(H) of size t. For any integer t>=0 and a fixed t-apex graph H, we give a polynomial-time algorithm to decide whether a (t+3)-connected H-minor-free graph is colorable from a given assignment of lists of size t+4. The connectivity requirement is the best possible in the sense that for every t>=1, there exists a t-apex graph H such that testing (t+4)-colorability of (t+2)-connected H-minor-free graphs is NP-complete. Similarly, the size of the lists cannot be decreased (unless P=NP), since for every t>=1, testing (t+3)-list-colorability of (t+3)-connected K_{t+4}-minor-free graphs is NP-complete.
[ { "created": "Tue, 7 Jan 2014 14:33:51 GMT", "version": "v1" }, { "created": "Mon, 26 Dec 2016 19:26:53 GMT", "version": "v2" } ]
2016-12-28
[ [ "Dvorak", "Zdenek", "" ], [ "Thomas", "Robin", "" ] ]
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1401.1404
Jer-Shing Huang
Daniel Lin and Jer-Shing Huang
Slant-gap plasmonic nanoantenna for optical chirality enhancement
10 pages, 5 figures and Supporting Information
Optics Express, 22, 7434-7445 (2014)
10.1364/OE.22.007434
null
cond-mat.mes-hall physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a new design of plasmonic nanoantenna with a slant gap for optical chirality engineering. At resonance, the slant gap provides highly enhanced electric field parallel to external magnetic field with a phase delay of 90 degree, resulting in enhanced optical chirality. We show by numerical simulations that upon linearly polarized excitation our achiral nanoantenna can generate near field with enhanced optical chirality that can be tuned by the slant angle and resonance condition. Our design can be easily realized and may find applications in circular dichroism enhancement.
[ { "created": "Tue, 7 Jan 2014 14:49:54 GMT", "version": "v1" } ]
2014-03-26
[ [ "Lin", "Daniel", "" ], [ "Huang", "Jer-Shing", "" ] ]
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1401.1406
Jianfeng Zhan
Lei Wang, Jianfeng Zhan, Chunjie Luo, Yuqing Zhu, Qiang Yang, Yongqiang He, Wanling Gao, Zhen Jia, Yingjie Shi, Shujie Zhang, Chen Zheng, Gang Lu, Kent Zhan, Xiaona Li, and Bizhu Qiu
BigDataBench: a Big Data Benchmark Suite from Internet Services
12 pages, 6 figures, The 20th IEEE International Symposium On High Performance Computer Architecture (HPCA-2014), February 15-19, 2014, Orlando, Florida, USA
null
10.1109/HPCA.2014.6835958
null
cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
As architecture, systems, and data management communities pay greater attention to innovative big data systems and architectures, the pressure of benchmarking and evaluating these systems rises. Considering the broad use of big data systems, big data benchmarks must include diversity of data and workloads. Most of the state-of-the-art big data benchmarking efforts target evaluating specific types of applications or system software stacks, and hence they are not qualified for serving the purposes mentioned above. This paper presents our joint research efforts on this issue with several industrial partners. Our big data benchmark suite BigDataBench not only covers broad application scenarios, but also includes diverse and representative data sets. BigDataBench is publicly available from http://prof.ict.ac.cn/BigDataBench . Also, we comprehensively characterize 19 big data workloads included in BigDataBench with varying data inputs. On a typical state-of-practice processor, Intel Xeon E5645, we have the following observations: First, in comparison with the traditional benchmarks: including PARSEC, HPCC, and SPECCPU, big data applications have very low operation intensity; Second, the volume of data input has non-negligible impact on micro-architecture characteristics, which may impose challenges for simulation-based big data architecture research; Last but not least, corroborating the observations in CloudSuite and DCBench (which use smaller data inputs), we find that the numbers of L1 instruction cache misses per 1000 instructions of the big data applications are higher than in the traditional benchmarks; also, we find that L3 caches are effective for the big data applications, corroborating the observation in DCBench.
[ { "created": "Mon, 6 Jan 2014 12:35:31 GMT", "version": "v1" }, { "created": "Sat, 22 Feb 2014 20:25:01 GMT", "version": "v2" } ]
2016-11-17
[ [ "Wang", "Lei", "" ], [ "Zhan", "Jianfeng", "" ], [ "Luo", "Chunjie", "" ], [ "Zhu", "Yuqing", "" ], [ "Yang", "Qiang", "" ], [ "He", "Yongqiang", "" ], [ "Gao", "Wanling", "" ], [ "Jia", "Zhen", "" ], [ "Shi", "Yingjie", "" ], [ "Zhang", "Shujie", "" ], [ "Zheng", "Chen", "" ], [ "Lu", "Gang", "" ], [ "Zhan", "Kent", "" ], [ "Li", "Xiaona", "" ], [ "Qiu", "Bizhu", "" ] ]
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1401.1413
B\'egu\'e Damien
D. B\'egu\'e, G.V. Vereshchagin
Transparency of an instantaneously created electron-positron-photon plasma
Accepted for publication in MNRAS, 6 pages, 5 figures
MNRAS 439 (2014) 924-928
10.1093/mnras/stu011
null
astro-ph.HE physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The problem of the expansion of a relativistic plasma generated when a large amount of energy is released in a small volume has been considered by many authors. We use the analytical solution of Bisnovatyi-Kogan and Murzina (1995) for the spherically symmetric relativistic expansion. The light-curves and the spectra from transparency of an electron-positron-photon plasma are obtained. We compare our results with the work of Goodman (1986).
[ { "created": "Tue, 7 Jan 2014 15:08:06 GMT", "version": "v1" } ]
2014-06-26
[ [ "Bégué", "D.", "" ], [ "Vereshchagin", "G. V.", "" ] ]
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1401.1415
Jun-Yu Ou
Jun-Yu Ou, Jin-Kyu So, Giorgio Adamo, Azat Sulaev, Lan Wang and Nikolay I. Zheludev
Ultraviolet and visible range plasmonics of a topological insulator
9 pages, 4 figures
null
10.1038/ncomms6139
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The development of metamaterials, data processing circuits and sensors for the visible and UV parts of the spectrum is hampered by the lack of low-loss media supporting plasmonic excitations and drives the intense search for plasmonic materials beyond noble metals. By studying plasmonic nanostructures fabricated on the surface of topological insulator $\mbox{Bi}_{1.5}\mbox{Sb}_{0.5}\mbox{Te}_{1.8}\mbox{Se}_{1.2}$ we found that it is orders of magnitude better plasmonic material than gold and silver in the blue-UV range. Metamaterial fabricated from $\mbox{Bi}_{1.5}\mbox{Sb}_{0.5}\mbox{Te}_{1.8}\mbox{Se}_{1.2}$ show plasmonic resonances from 350 nm to 550 nm while surface gratings exhibit cathodoluminescent peaks from 230 nm to 1050 nm. The negative permittivity underpinning plasmonic response is attributed to the combination of bulk interband transitions and surface contribution of the topologically protected states. The importance of our result is in the identification of new mechanisms of negative permittivity in semiconductors where visible-range plasmonics can be directly integrated with electronics.
[ { "created": "Tue, 7 Jan 2014 15:15:00 GMT", "version": "v1" }, { "created": "Fri, 10 Jan 2014 18:00:38 GMT", "version": "v2" } ]
2020-05-12
[ [ "Ou", "Jun-Yu", "" ], [ "So", "Jin-Kyu", "" ], [ "Adamo", "Giorgio", "" ], [ "Sulaev", "Azat", "" ], [ "Wang", "Lan", "" ], [ "Zheludev", "Nikolay I.", "" ] ]
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1401.1418
Leonardo A Pachon
Leonardo A. Pachon, Johan F. Triana, David Zueco, Paul Brumer
Influence of Non-Markovian Dynamics in Thermal-Equilibrium Uncertainty-Relations
9 pages, 3 figures
J. Chem. Phys. 150, 034105 (2019)
10.1063/1.5055061
null
quant-ph physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Contrary to the conventional wisdom that deviations from standard thermodynamics originate from the strong coupling to the bath, it is shown that in quantum mechanics, these deviations originate from the uncertainty principle and are supported by the non-Markovian character of the dynamics. Specifically, it is shown that the lower bound of the dispersion of the total energy of the system, imposed by the uncertainty principle, is dominated by the bath power spectrum and therefore, quantum mechanics inhibits the system thermal-equilibrium-state from being described by the canonical Boltzmann's distribution. We show that for a wide class of systems, systems interacting via central forces with pairwise-self-interacting environments, this general observation is in sharp contrast to the classical case, for which the thermal equilibrium distribution, irrespective of the interaction strength, is \emph{exactly} characterized by the canonical Boltzmann distribution and therefore, no dependence on the bath power spectrum is present. We define an \emph{effective coupling} to the environment that depends on all energy scales in the system and reservoir interaction. Sample computations in regimes predicted by this effective coupling are demonstrated. For example, for the case of strong effective coupling, deviations from standard thermodynamics are present and, for the case of weak effective coupling, quantum features such as stationary entanglement are possible at high temperatures.
[ { "created": "Tue, 7 Jan 2014 15:35:29 GMT", "version": "v1" }, { "created": "Tue, 26 Apr 2016 21:21:37 GMT", "version": "v2" }, { "created": "Mon, 31 Oct 2016 22:36:00 GMT", "version": "v3" }, { "created": "Tue, 8 Jan 2019 09:04:30 GMT", "version": "v4" } ]
2019-03-15
[ [ "Pachon", "Leonardo A.", "" ], [ "Triana", "Johan F.", "" ], [ "Zueco", "David", "" ], [ "Brumer", "Paul", "" ] ]
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1401.1424
Matthias W\"ahlisch
Gabriel B. T. Kalejaiye, Jo\~ao A. S. R. Rondina, Leonardo V. V. L. Albuquerque, Ta\'is L. Pereira, Luiz F. O. Campos, Raphael A. S. Melo, Daniel S. Mascarenhas, Marcelo M. Carvalho
Mobile Offloading in Wireless Ad Hoc Networks
Published in: E. Baccelli, F. Juraschek, O. Hahm, T. C. Schmidt, H. Will, M. W\"ahlisch (Eds.), Proc. of 3rd MANIAC Challenge, Berlin, Germany, July 27 - 28, 2013, arXiv:1401.1163, Jan. 2014
null
null
MANIAC/2013/04
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper describes a strategy that was designed, implemented, and presented at the {\it Mobile Ad Hoc Networking Interoperability and Cooperation (MANIAC) Challenge 2013}. The theme of the MANIAC Challenge 2013 was ``Mobile Data Offloading,'' and consisted on developing and comparatively evaluating strategies to offload infrastructure access points via customer ad hoc forwarding using handheld devices (e.g., tablets and smartphones). According to the challenge rules, a hop-by-hop bidding contest (or ``auction'') should decide the path of each data packet towards its destination. Consequently, each team should rely on other teams' willingness to forward packets for them in order to get their traffic across the network. In this application scenario, the incentive for customers to join the ad hoc network is discounted monthly fees, while operators should benefit from decreased infrastructure costs. Following the rules of MANIAC Challenge 2013, this paper proposes a strategy that is based on the concept of how ``tight'' a node is to successfully deliver a packet to its destination within a given deadline. This ``tightness'' idea relies on a shortest-path analysis of the underlying network graph, and it is used to define three sub-strategies that specify a) how to participate in an auction; b) how to announce an auction; and c) how to decide who wins the announced auction. The proposed strategy seeks to minimize network resource utilization and to promote cooperative behavior among participant nodes.
[ { "created": "Tue, 7 Jan 2014 16:01:23 GMT", "version": "v1" } ]
2014-01-08
[ [ "Kalejaiye", "Gabriel B. T.", "" ], [ "Rondina", "João A. S. R.", "" ], [ "Albuquerque", "Leonardo V. V. L.", "" ], [ "Pereira", "Taís L.", "" ], [ "Campos", "Luiz F. O.", "" ], [ "Melo", "Raphael A. S.", "" ], [ "Mascarenhas", "Daniel S.", "" ], [ "Carvalho", "Marcelo M.", "" ] ]
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1401.1428
Matthias W\"ahlisch
Alan Ferrari, Dario Gallucci
B-Maniac
Published in: E. Baccelli, F. Juraschek, O. Hahm, T. C. Schmidt, H. Will, M. W\"ahlisch (Eds.), Proc. of 3rd MANIAC Challenge, Berlin, Germany, July 27 - 28, 2013, arXiv:1401.1163, Jan. 2014
null
null
MANIAC/2013/01
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Mobile Data Offloading permits users to use cheap communication media, whenever feasible, for delivering their personal data instead of using the infrastructure which is more expensive. Having good procedures to assess and compare the different possibilities a device has to send his data is crucial. In the following paper, we propose an evaluating approach that takes into consideration the topology changes history in order to provide an efficient way to calculate the quality of a specific medium. In particular \textit{Bayesian Networks} are used as basis to provide our solution to the Maniac Challenge 2013. Bayesian Networks is a statistical model for the generation of inferences starting with very little information. In the next sections we will give a definition of the Bayesian Networks focusing on the simplest and computationally efficient of the Bayesian Networks versions, named \textit{\naive Bayes}. Finally, we will show our method for the challenge to evaluate the medium and the bid strategy.
[ { "created": "Tue, 7 Jan 2014 16:10:44 GMT", "version": "v1" } ]
2014-01-08
[ [ "Ferrari", "Alan", "" ], [ "Gallucci", "Dario", "" ] ]
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1401.1434
Stefan K\"onig
Stefan K\"onig
Computational Aspects of the Hausdorff Distance in Unbounded Dimension
null
null
null
null
cs.CG cs.CC math.MG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the computational complexity of determining the Hausdorff distance of two polytopes given in halfspace- or vertex-presentation in arbitrary dimension. Subsequently, a matching problem is investigated where a convex body is allowed to be homothetically transformed in order to minimize its Hausdorff distance to another one. For this problem, we characterize optimal solutions, deduce a Helly-type theorem and give polynomial time (approximation) algorithms for polytopes.
[ { "created": "Tue, 7 Jan 2014 16:37:02 GMT", "version": "v1" } ]
2014-01-08
[ [ "König", "Stefan", "" ] ]
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1401.1448
Denis Kuperberg
Denis Kuperberg
Linear Temporal Logic for Regular Cost Functions
37 pages, 13 figures, accepted to LMCS, updated version 08/02/2017
Logical Methods in Computer Science, Volume 10, Issue 1 (February 4, 2014) lmcs:1222
10.2168/LMCS-10(1:4)2014
null
cs.LO cs.FL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Regular cost functions have been introduced recently as an extension to the notion of regular languages with counting capabilities, which retains strong closure, equivalence, and decidability properties. The specificity of cost functions is that exact values are not considered, but only estimated. In this paper, we define an extension of Linear Temporal Logic (LTL) over finite words to describe cost functions. We give an explicit translation from this new logic to two dual form of cost automata, and we show that the natural decision problems for this logic are PSPACE-complete, as it is the case in the classical setting. We then algebraically characterize the expressive power of this logic, using a new syntactic congruence for cost functions introduced in this paper.
[ { "created": "Tue, 7 Jan 2014 17:24:18 GMT", "version": "v1" }, { "created": "Sun, 2 Feb 2014 22:02:49 GMT", "version": "v2" }, { "created": "Thu, 8 May 2014 16:06:09 GMT", "version": "v3" }, { "created": "Tue, 7 Feb 2017 16:35:41 GMT", "version": "v4" }, { "created": "Wed, 8 Feb 2017 12:52:42 GMT", "version": "v5" } ]
2017-02-09
[ [ "Kuperberg", "Denis", "" ] ]
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1401.1450
Diego Fernando C. Carri\'on L.
Diego Fernando C. Carri\'on L
A Recursive Algorithmic Approach to the Finding of Permutations for the Combination of Any Two Sets
12 pages, 4 figures, originally submitted to the July 2013 Brigham Young University-Idaho Research and Creative Works Conference
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cs.DS
http://creativecommons.org/licenses/by/3.0/
In this paper I present a conjecture for a recursive algorithm that finds each permutation of combining two sets of objects (AKA the Shuffle Product). This algorithm provides an efficient way to navigate this problem, as each atomic operation yields a permutation of the union. The permutations of the union of the two sets are represented as binary integers which are then manipulated mathematically to find the next permutation. The routes taken to find each of the permutations then form a series of associations or adjacencies which can be represented in a tree graph which appears to possess some properties of a fractal. This algorithm was discovered while attempting to identify every possible end-state of a Tic-Tac-Toe (Naughts and Crosses) board. It was found to be a viable and efficient solution to the problem, and now---in its more generalized state---it is my belief that it may find applications among a wide range of theoretical and applied sciences. I hypothesize that, due to the fractal-like nature of the tree it traverses, this algorithm sheds light on a more generic principle of combinatorics and as such could be further generalized to perhaps be applied to the union of any number of sets.
[ { "created": "Tue, 7 Jan 2014 17:30:05 GMT", "version": "v1" } ]
2014-01-08
[ [ "L", "Diego Fernando C. Carrión", "" ] ]
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1401.1451
Kalpana Pandey
Kalpana Kandpal, Anjali Singhal
Smart Grid Demand Monitoring Model
3 pages, 1 figure, International Journal
null
null
null
cs.OH
http://creativecommons.org/licenses/by/3.0/
This paper is in related to the demand genrated by the consumer for a time for the power which is being viewed by taking some measures to solve the demand need.
[ { "created": "Tue, 7 Jan 2014 17:30:29 GMT", "version": "v1" } ]
2014-01-08
[ [ "Kandpal", "Kalpana", "" ], [ "Singhal", "Anjali", "" ] ]
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1401.1456
Margarita Karkali
Margarita Karkali, Francois Rousseau, Alexandros Ntoulas, Michalis Vazirgiannis
Using temporal IDF for efficient novelty detection in text streams
30 pages
null
null
null
cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Novelty detection in text streams is a challenging task that emerges in quite a few different scenarios, ranging from email thread filtering to RSS news feed recommendation on a smartphone. An efficient novelty detection algorithm can save the user a great deal of time and resources when browsing through relevant yet usually previously-seen content. Most of the recent research on detection of novel documents in text streams has been building upon either geometric distances or distributional similarities, with the former typically performing better but being much slower due to the need of comparing an incoming document with all the previously-seen ones. In this paper, we propose a new approach to novelty detection in text streams. We describe a resource-aware mechanism that is able to handle massive text streams such as the ones present today thanks to the burst of social media and the emergence of the Web as the main source of information. We capitalize on the historical Inverse Document Frequency (IDF) that was known for capturing well term specificity and we show that it can be used successfully at the document level as a measure of document novelty. This enables us to avoid similarity comparisons with previous documents in the text stream, thus scaling better and leading to faster execution times. Moreover, as the collection of documents evolves over time, we use a temporal variant of IDF not only to maintain an efficient representation of what has already been seen but also to decay the document frequencies as the time goes by. We evaluate the performance of the proposed approach on a real-world news articles dataset created for this task. The results show that the proposed method outperforms all of the baselines while managing to operate efficiently in terms of time complexity and memory usage, which are of great importance in a mobile setting scenario.
[ { "created": "Tue, 7 Jan 2014 17:43:37 GMT", "version": "v1" }, { "created": "Sun, 9 Nov 2014 15:58:35 GMT", "version": "v2" } ]
2014-11-11
[ [ "Karkali", "Margarita", "" ], [ "Rousseau", "Francois", "" ], [ "Ntoulas", "Alexandros", "" ], [ "Vazirgiannis", "Michalis", "" ] ]
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1401.1458
Young-Ho Eom
Young-Ho Eom, Hang-Hyun Jo
Generalized friendship paradox in complex networks: The case of scientific collaboration
Published in Scientific Reports. 9 pages, 3 figures
Scientific Reports 4, 4603 (2014)
10.1038/srep04603
null
cs.SI physics.data-an physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The friendship paradox states that your friends have on average more friends than you have. Does the paradox "hold" for other individual characteristics like income or happiness? To address this question, we generalize the friendship paradox for arbitrary node characteristics in complex networks. By analyzing two coauthorship networks of Physical Review journals and Google Scholar profiles, we find that the generalized friendship paradox (GFP) holds at the individual and network levels for various characteristics, including the number of coauthors, the number of citations, and the number of publications. The origin of the GFP is shown to be rooted in positive correlations between degree and characteristics. As a fruitful application of the GFP, we suggest effective and efficient sampling methods for identifying high characteristic nodes in large-scale networks. Our study on the GFP can shed lights on understanding the interplay between network structure and node characteristics in complex networks.
[ { "created": "Tue, 7 Jan 2014 17:51:14 GMT", "version": "v1" }, { "created": "Mon, 31 Mar 2014 16:59:54 GMT", "version": "v2" }, { "created": "Thu, 10 Apr 2014 09:21:46 GMT", "version": "v3" } ]
2014-04-11
[ [ "Eom", "Young-Ho", "" ], [ "Jo", "Hang-Hyun", "" ] ]
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1401.1460
Jan Rochel
Clemens Grabmayer and Jan Rochel
Maximal Sharing in the Lambda Calculus with letrec
18 pages, plus 19 pages appendix
null
10.1145/2628136.2628148
null
cs.PL
http://creativecommons.org/licenses/publicdomain/
Increasing sharing in programs is desirable to compactify the code, and to avoid duplication of reduction work at run-time, thereby speeding up execution. We show how a maximal degree of sharing can be obtained for programs expressed as terms in the lambda calculus with letrec. We introduce a notion of `maximal compactness' for lambda-letrec-terms among all terms with the same infinite unfolding. Instead of defined purely syntactically, this notion is based on a graph semantics. lambda-letrec-terms are interpreted as first-order term graphs so that unfolding equivalence between terms is preserved and reflected through bisimilarity of the term graph interpretations. Compactness of the term graphs can then be compared via functional bisimulation. We describe practical and efficient methods for the following two problems: transforming a lambda-letrec-term into a maximally compact form; and deciding whether two lambda-letrec-terms are unfolding-equivalent. The transformation of a lambda-letrec-term $L$ into maximally compact form $L_0$ proceeds in three steps: (i) translate L into its term graph $G = [[ L ]]$; (ii) compute the maximally shared form of $G$ as its bisimulation collapse $G_0$; (iii) read back a lambda-letrec-term $L_0$ from the term graph $G_0$ with the property $[[ L_0 ]] = G_0$. This guarantees that $L_0$ and $L$ have the same unfolding, and that $L_0$ exhibits maximal sharing. The procedure for deciding whether two given lambda-letrec-terms $L_1$ and $L_2$ are unfolding-equivalent computes their term graph interpretations $[[ L_1 ]]$ and $[[ L_2 ]]$, and checks whether these term graphs are bisimilar. For illustration, we also provide a readily usable implementation.
[ { "created": "Tue, 7 Jan 2014 18:01:41 GMT", "version": "v1" }, { "created": "Thu, 16 Jan 2014 14:42:02 GMT", "version": "v2" }, { "created": "Thu, 10 Apr 2014 12:46:41 GMT", "version": "v3" }, { "created": "Thu, 17 Apr 2014 13:05:03 GMT", "version": "v4" }, { "created": "Mon, 23 Jun 2014 21:41:15 GMT", "version": "v5" } ]
2015-12-04
[ [ "Grabmayer", "Clemens", "" ], [ "Rochel", "Jan", "" ] ]
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1401.1465
David Balduzzi
David Balduzzi
Cortical prediction markets
To appear, AAMAS 2014
null
null
null
cs.AI cs.GT cs.LG cs.MA q-bio.NC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate cortical learning from the perspective of mechanism design. First, we show that discretizing standard models of neurons and synaptic plasticity leads to rational agents maximizing simple scoring rules. Second, our main result is that the scoring rules are proper, implying that neurons faithfully encode expected utilities in their synaptic weights and encode high-scoring outcomes in their spikes. Third, with this foundation in hand, we propose a biologically plausible mechanism whereby neurons backpropagate incentives which allows them to optimize their usefulness to the rest of cortex. Finally, experiments show that networks that backpropagate incentives can learn simple tasks.
[ { "created": "Tue, 7 Jan 2014 18:28:20 GMT", "version": "v1" } ]
2014-01-08
[ [ "Balduzzi", "David", "" ] ]
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1401.1467
Mikhail Andreev
Mikhail Andreev, Akim Kumok
The sum $2^{\mathit{KA}(x)-\mathit{KP}(x)}$ over all prefixes $x$ of some binary sequence can be infinite
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider two quantities that measure complexity of binary strings: $\mathit{KA}(x)$ is defined as the minus logarithm of continuous a priori probability on the binary tree, and $\mathit{KP}(x)$ denotes prefix complexity of a binary string $x$. In this paper we answer a question posed by Joseph Miller and prove that there exists an infinite binary sequence $\omega$ such that the sum of $2^{\mathit{KA}(x)-\mathit{KP}(x)}$ over all prefixes $x$ of $\omega$ is infinite. Such a sequence can be chosen among characteristic sequences of computably enumerable sets.
[ { "created": "Tue, 7 Jan 2014 18:30:52 GMT", "version": "v1" } ]
2014-01-08
[ [ "Andreev", "Mikhail", "" ], [ "Kumok", "Akim", "" ] ]
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1401.1472
Nirman Kumar
Sariel Har-Peled and Nirman Kumar
Robust Proximity Search for Balls using Sublinear Space
null
null
null
null
cs.CG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Given a set of n disjoint balls b1, . . ., bn in IRd, we provide a data structure, of near linear size, that can answer (1 \pm \epsilon)-approximate kth-nearest neighbor queries in O(log n + 1/\epsilon^d) time, where k and \epsilon are provided at query time. If k and \epsilon are provided in advance, we provide a data structure to answer such queries, that requires (roughly) O(n/k) space; that is, the data structure has sublinear space requirement if k is sufficiently large.
[ { "created": "Tue, 7 Jan 2014 18:40:49 GMT", "version": "v1" }, { "created": "Wed, 29 Oct 2014 05:51:17 GMT", "version": "v2" } ]
2014-10-30
[ [ "Har-Peled", "Sariel", "" ], [ "Kumar", "Nirman", "" ] ]
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1401.1473
Steven Brunton
Steven L. Brunton and Scott T. M. Dawson and Clarence W. Rowley
State-space model identification and feedback control of unsteady aerodynamic forces
20 pages, 13 figures
null
10.1016/j.jfluidstructs.2014.06.026
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Unsteady aerodynamic models are necessary to accurately simulate forces and develop feedback controllers for wings in agile motion; however, these models are often high dimensional or incompatible with modern control techniques. Recently, reduced-order unsteady aerodynamic models have been developed for a pitching and plunging airfoil by linearizing the discretized Navier-Stokes equation with lift-force output. In this work, we extend these reduced-order models to include multiple inputs (pitch, plunge, and surge) and explicit parameterization by the pitch-axis location, inspired by Theodorsen's model. Next, we investigate the na\"{\i}ve application of system identification techniques to input--output data and the resulting pitfalls, such as unstable or inaccurate models. Finally, robust feedback controllers are constructed based on these low-dimensional state-space models for simulations of a rigid flat plate at Reynolds number 100. Various controllers are implemented for models linearized at base angles of attack $\alpha_0=0^\circ, \alpha_0=10^\circ$, and $\alpha_0=20^\circ$. The resulting control laws are able to track an aggressive reference lift trajectory while attenuating sensor noise and compensating for strong nonlinearities.
[ { "created": "Tue, 7 Jan 2014 18:44:25 GMT", "version": "v1" } ]
2015-06-18
[ [ "Brunton", "Steven L.", "" ], [ "Dawson", "Scott T. M.", "" ], [ "Rowley", "Clarence W.", "" ] ]
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1401.1475
Paulo Shakarian
Paulo Shakarian, Gerardo I. Simari, Marcelo A. Falappa
Belief Revision in Structured Probabilistic Argumentation
null
null
null
null
cs.LO cs.AI
http://creativecommons.org/licenses/publicdomain/
In real-world applications, knowledge bases consisting of all the information at hand for a specific domain, along with the current state of affairs, are bound to contain contradictory data coming from different sources, as well as data with varying degrees of uncertainty attached. Likewise, an important aspect of the effort associated with maintaining knowledge bases is deciding what information is no longer useful; pieces of information (such as intelligence reports) may be outdated, may come from sources that have recently been discovered to be of low quality, or abundant evidence may be available that contradicts them. In this paper, we propose a probabilistic structured argumentation framework that arises from the extension of Presumptive Defeasible Logic Programming (PreDeLP) with probabilistic models, and argue that this formalism is capable of addressing the basic issues of handling contradictory and uncertain data. Then, to address the last issue, we focus on the study of non-prioritized belief revision operations over probabilistic PreDeLP programs. We propose a set of rationality postulates -- based on well-known ones developed for classical knowledge bases -- that characterize how such operations should behave, and study a class of operators along with theoretical relationships with the proposed postulates, including a representation theorem stating the equivalence between this class and the class of operators characterized by the postulates.
[ { "created": "Tue, 7 Jan 2014 18:53:24 GMT", "version": "v1" } ]
2014-01-08
[ [ "Shakarian", "Paulo", "" ], [ "Simari", "Gerardo I.", "" ], [ "Falappa", "Marcelo A.", "" ] ]
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1401.1477
Sariel Har-Peled
Sariel Har-Peled and Benjamin Raichel
On the Complexity of Randomly Weighted Voronoi Diagrams
null
null
null
null
cs.CG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we provide an $O(n \mathrm{polylog} n)$ bound on the expected complexity of the randomly weighted Voronoi diagram of a set of $n$ sites in the plane, where the sites can be either points, interior-disjoint convex sets, or other more general objects. Here the randomness is on the weight of the sites, not their location. This compares favorably with the worst case complexity of these diagrams, which is quadratic. As a consequence we get an alternative proof to that of Agarwal etal [AHKS13] of the near linear complexity of the union of randomly expanded disjoint segments or convex sets (with an improved bound on the latter). The technique we develop is elegant and should be applicable to other problems.
[ { "created": "Tue, 7 Jan 2014 19:00:02 GMT", "version": "v1" }, { "created": "Thu, 19 Mar 2015 21:39:27 GMT", "version": "v2" } ]
2015-03-23
[ [ "Har-Peled", "Sariel", "" ], [ "Raichel", "Benjamin", "" ] ]
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1401.1479
Andrey Garnaev
Andrey Garnaev and Yezekael Hayel and Eitan Altman
Multilevel Pricing Schemes in a Deregulated Wireless Network Market
This is the last draft version of the paper. Revised version of the paper accepted by ValueTools 2013 can be found in Proceedings of the 7th International Conference on Performance Evaluation Methodologies and Tools (ValueTools '13), December 10-12, 2013, Turin, Italy
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cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Typically the cost of a product, a good or a service has many components. Those components come from different complex steps in the supply chain of the product from sourcing to distribution. This economic point of view also takes place in the determination of goods and services in wireless networks. Indeed, before transmitting customer data, a network operator has to lease some frequency range from a spectrum owner and also has to establish agreements with electricity suppliers. The goal of this paper is to compare two pricing schemes, namely a power-based and a flat rate, and give a possible explanation why flat rate pricing schemes are more common than power based pricing ones in a deregulated wireless market. We suggest a hierarchical game-theoretical model of a three level supply chain: the end users, the service provider and the spectrum owner. The end users intend to transmit data on a wireless network. The amount of traffic sent by the end users depends on the available frequency bandwidth as well as the price they have to pay for their transmission. A natural question arises for the service provider: how to design an efficient pricing scheme in order to maximize his profit. Moreover he has to take into account the lease charge he has to pay to the spectrum owner and how many frequency bandwidth to rent. The spectrum owner itself also looks for maximizing its profit and has to determine the lease price to the service provider. The equilibrium at each level of our supply chain model are established and several properties are investigated. In particular, in the case of a power-based pricing scheme, the service provider and the spectrum owner tend to share the gross provider profit. Whereas, considering the flat rate pricing scheme, if the end users are going to exploit the network intensively, then the tariffs of the suppliers (spectrum owner and service provider) explode.
[ { "created": "Tue, 7 Jan 2014 19:08:01 GMT", "version": "v1" } ]
2014-01-08
[ [ "Garnaev", "Andrey", "" ], [ "Hayel", "Yezekael", "" ], [ "Altman", "Eitan", "" ] ]
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1401.1480
Yair Carmon
Yair Carmon and Shlomo Shamai
Lower Bounds and Approximations for the Information Rate of the ISI Channel
21 pages, 4 figures
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the discrete-time intersymbol interference (ISI) channel model, with additive Gaussian noise and fixed i.i.d. inputs. In this setting, we investigate the expression put forth by Shamai and Laroia as a conjectured lower bound for the input-output mutual information after application of a MMSE-DFE receiver. A low-SNR expansion is used to prove that the conjectured bound does not hold under general conditions, and to characterize inputs for which it is particularly ill-suited. One such input is used to construct a counterexample, indicating that the Shamai-Laroia expression does not always bound even the achievable rate of the channel, thus excluding a natural relaxation of the original conjectured bound. However, this relaxed bound is then shown to hold for any finite entropy input and ISI channel, when the SNR is sufficiently high. Finally, new simple bounds for the achievable rate are proven, and compared to other known bounds. Information-Estimation relations and estimation-theoretic bounds play a key role in establishing our results.
[ { "created": "Tue, 7 Jan 2014 19:15:17 GMT", "version": "v1" } ]
2014-01-08
[ [ "Carmon", "Yair", "" ], [ "Shamai", "Shlomo", "" ] ]
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1401.1486
Zeeshan Bhatti
Imdad Ali Ismaili, Zeeshan Bhatti, Azhar Ali Shah
Design & Development of the Graphical User Interface for Sindhi Language
null
Mehran University Research Journal of Engineering & Technology, Volume 30, No. 4, October 2011 [ISSN 0254-7821]
null
null
cs.HC cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper describes the design and implementation of a Unicode-based GUISL (Graphical User Interface for Sindhi Language). The idea is to provide a software platform to the people of Sindh as well as Sindhi diasporas living across the globe to make use of computing for basic tasks such as editing, composition, formatting, and printing of documents in Sindhi by using GUISL. The implementation of the GUISL has been done in the Java technology to make the system platform independent. The paper describes several design issues of Sindhi GUI in the context of existing software tools and technologies and explains how mapping and concatenation techniques have been employed to achieve the cursive shape of Sindhi script.
[ { "created": "Tue, 7 Jan 2014 20:07:51 GMT", "version": "v1" } ]
2014-01-08
[ [ "Ismaili", "Imdad Ali", "" ], [ "Bhatti", "Zeeshan", "" ], [ "Shah", "Azhar Ali", "" ] ]
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1401.1488
Zeeshan Bhatti
Zeeshan Bhatti, Asadullah Shah, Farruh Shahidi, Mostafa Karbasi
Forward and Inverse Kinematics Seamless Matching Using Jacobian
null
Sindh University Research Journal (SURJ) Volume 45 (2), 8/2013, pp:387-392, Sindh University Press
null
null
cs.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper the problem of matching Forward Kinematics (FK) motion of a 3 Dimensional (3D) joint chain to the Inverse Kinematics (IK) movement and vice versa has been addressed. The problem lies at the heart of animating a 3D character having controller and manipulator based rig for animation within any 3D modeling and animation software. The seamless matching has been achieved through the use of pseudo-inverse of Jacobian Matrix. The Jacobian Matrix is used to determine the rotation values of each joint of character body part such as arms, between the inverse kinematics and forward kinematics motion. Then moving the corresponding kinematic joint system to the desired place, automatically eliminating the jumping or popping effect which would reduce the complexity of the system.
[ { "created": "Tue, 7 Jan 2014 20:14:55 GMT", "version": "v1" } ]
2014-01-08
[ [ "Bhatti", "Zeeshan", "" ], [ "Shah", "Asadullah", "" ], [ "Shahidi", "Farruh", "" ], [ "Karbasi", "Mostafa", "" ] ]
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1401.1489
Romain H\'erault
John Komar and Romain H\'erault and Ludovic Seifert
Key point selection and clustering of swimmer coordination through Sparse Fisher-EM
Presented at ECML/PKDD 2013 Workshop on Machine Learning and Data Mining for Sports Analytics (MLSA2013)
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stat.ML cs.CV cs.LG physics.data-an stat.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
To answer the existence of optimal swimmer learning/teaching strategies, this work introduces a two-level clustering in order to analyze temporal dynamics of motor learning in breaststroke swimming. Each level have been performed through Sparse Fisher-EM, a unsupervised framework which can be applied efficiently on large and correlated datasets. The induced sparsity selects key points of the coordination phase without any prior knowledge.
[ { "created": "Tue, 7 Jan 2014 20:16:05 GMT", "version": "v1" } ]
2014-01-08
[ [ "Komar", "John", "" ], [ "Hérault", "Romain", "" ], [ "Seifert", "Ludovic", "" ] ]
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1401.1491
Markus Reiher
Thomas Weymuth and Markus Reiher
Gradient-Driven Molecule Construction: An Inverse Approach Applied to the Design of Small-Molecule Fixating Catalysts
40 pages, 6 tables, 5 figures
International Journal of Quantum Chemistry, Volume 114, Issue 13, pages 838-850, 5 July 2014
10.1002/qua.24686
null
physics.chem-ph cond-mat.mtrl-sci physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Rational design of molecules and materials usually requires extensive screening of molecular structures for the desired property. The inverse approach to deduce a structure for a predefined property would be highly desirable, but is, unfortunately, not well-defined. However, feasible strategies for such an inverse design process may be successfully developed for specific purposes. We discuss options for calculating 'jacket' potentials that fulfill a predefined target requirement - a concept that we recently introduced [T. Weymuth, M. Reiher, MRS Proceediungs, 2013, 1524, DOI:10.1557/opl.2012.1764]. We consider the case of small-molecule activating transition metal catalysts. As a target requirement we choose the vanishing geometry gradients on all atoms of a subsystem consisting of a metal center binding the small molecule to be activated. The jacket potential can be represented within a full quantum model or by a sequence of approximations of which a field of electrostatic point charges is the simplest. In a second step, the jacket potential needs to be replaced by a chemically viable chelate-ligand structure for which the geometry gradients on all of its atoms are also required to vanish. In order to analyze the feasibility of this approach, we dissect a known dinitrogen-fixating catalyst to study possible design strategies that must eventually produce the known catalyst.
[ { "created": "Tue, 7 Jan 2014 20:32:33 GMT", "version": "v1" }, { "created": "Sat, 17 May 2014 01:18:59 GMT", "version": "v2" } ]
2014-05-20
[ [ "Weymuth", "Thomas", "" ], [ "Reiher", "Markus", "" ] ]
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1401.1493
Oskar Painter J
Amir H. Safavi-Naeini, Jeff T. Hill, Sean Meenehan, Jasper Chan, Simon Groeblacher, and Oskar Painter
Two-dimensional phononic-photonic bandgap optomechanical crystal cavity
4 pages, 4 figures
Phys. Rev. Lett. 112, 153603 (2014)
10.1103/PhysRevLett.112.153603
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the fabrication and characterization of an artificial crystal structure formed from a thin-film of silicon which has a full phononic bandgap for microwave X-band phonons and a two-dimensional pseudo-bandgap for near-infrared photons. An engineered defect in the crystal structure is used to localize optical and mechanical resonances in the bandgap of the planar crystal. Two-tone optical spectroscopy is used to characterize the cavity system, showing a large vacuum coupling rate of 220kHz between the fundamental optical cavity resonance at 195THz and a co-localized mechanical resonance at 9.3GHz.
[ { "created": "Tue, 7 Jan 2014 20:40:05 GMT", "version": "v1" } ]
2015-06-18
[ [ "Safavi-Naeini", "Amir H.", "" ], [ "Hill", "Jeff T.", "" ], [ "Meenehan", "Sean", "" ], [ "Chan", "Jasper", "" ], [ "Groeblacher", "Simon", "" ], [ "Painter", "Oskar", "" ] ]
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1401.1495
Howard Milchberg
J. K. Wahlstrand, N. Jhajj, E. W. Rosenthal, S. Zahedpour, and H. M. Milchberg
Direct measurement of the acoustic waves generated by femtosecond filaments in air
null
null
10.1364/OL.39.001290
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present direct measurements of the gas acoustic dynamics following interaction of spatial single- and multi-mode 50 fs, 800 nm pulses in air at 10 Hz and 1 kHz repetition rates. Results are in excellent agreement with hydrodynamic simulations. Under no conditions for single filaments do we find on-axis enhancement of gas density; this occurs only with multi-filaments. We also investigate the propagation of probe beams in the gas density profile induced by a single extended filament. We find that light trapping in the expanding annular acoustic wave can create the impression of on-axis guiding in a limited temporal window.
[ { "created": "Tue, 7 Jan 2014 20:50:32 GMT", "version": "v1" } ]
2015-10-16
[ [ "Wahlstrand", "J. K.", "" ], [ "Jhajj", "N.", "" ], [ "Rosenthal", "E. W.", "" ], [ "Zahedpour", "S.", "" ], [ "Milchberg", "H. M.", "" ] ]
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1401.1498
Nobumitsu Yokoi
Nobumitsu Yokoi, Katsuaki Higashimori, and Masahiro Hoshino
Transport enhancement and suppression in turbulent magnetic reconnection: A self-consistent turbulence model
18 pages, 7 figures
Physics of Plasmas, Vol. 20, No. 12, 122310 (2013)
10.1063/1.4851976
null
physics.plasm-ph astro-ph.SR physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Through the enhancement of transport, turbulence is expected to contribute to the fast reconnection. However the effects of turbulence are not so straightforward. In addition to the enhancement of transport, turbulence under some environment shows effects that suppress the transport. In the presence of turbulent cross helicity, such a dynamic balance between the transport enhancement and suppression occurs. As this result of dynamic balance, the region of effective enhanced magnetic diffusivity is confined to a narrow region, leading to the fast reconnection. In order to confirm this idea, a self-consistent turbulence model for the magnetic reconnection is proposed. With the aid of numerical simulations where turbulence effects are incorporated in a consistent manner through the turbulence model, the dynamic balance in the turbulence magnetic reconnection is confirmed.
[ { "created": "Wed, 8 Jan 2014 06:46:16 GMT", "version": "v1" } ]
2014-01-09
[ [ "Yokoi", "Nobumitsu", "" ], [ "Higashimori", "Katsuaki", "" ], [ "Hoshino", "Masahiro", "" ] ]
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1401.1512
Markus Reiher
Thomas Weymuth and Markus Reiher
Inverse Quantum Chemistry: Concepts and Strategies for Rational Compound Design
43 pages, 5 figures
International Journal of Quantum Chemistry, Volume 114, Issue 13, pages 823-837, 5 July 2014
10.1002/qua.24687
null
physics.chem-ph cond-mat.mtrl-sci physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The rational design of molecules and materials is becoming more and more important. With the advent of powerful computer systems and sophisticated algorithms, quantum chemistry plays an important role in rational design. While traditional quantum chemical approaches predict the properties of a predefined molecular structure, the goal of inverse quantum chemistry is to find a structure featuring one or more desired properties. Herein, we review inverse quantum chemical approaches proposed so far and discuss their advantages as well as their weaknesses.
[ { "created": "Tue, 7 Jan 2014 21:14:36 GMT", "version": "v1" }, { "created": "Sat, 17 May 2014 00:49:26 GMT", "version": "v2" } ]
2014-05-20
[ [ "Weymuth", "Thomas", "" ], [ "Reiher", "Markus", "" ] ]
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1401.1513
Karim Seddik
Karim G. Seddik
On the Stability of Random Multiple Access with Feedback Exploitation and Queue Priority
null
null
null
null
cs.IT cs.NI cs.PF math.IT
http://creativecommons.org/licenses/by/3.0/
In this paper, we study the stability of two interacting queues under random multiple access in which the queues leverage the feedback information. We derive the stability region under random multiple access where one of the two queues exploits the feedback information and backs off under negative acknowledgement (NACK) and the other, higher priority, queue will access the channel with probability one. We characterize the stability region of this feedback-based random access protocol and prove that this derived stability region encloses the stability region of the conventional random access (RA) scheme that does not exploit the feedback information.
[ { "created": "Mon, 6 Jan 2014 20:11:21 GMT", "version": "v1" } ]
2014-01-09
[ [ "Seddik", "Karim G.", "" ] ]
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1401.1526
Colleen Swanson
Colleen M. Swanson and Douglas R. Stinson
Additional Constructions to Solve the Generalized Russian Cards Problem using Combinatorial Designs
null
null
null
null
cs.CR math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the generalized Russian cards problem, we have a card deck $X$ of $n$ cards and three participants, Alice, Bob, and Cathy, dealt $a$, $b$, and $c$ cards, respectively. Once the cards are dealt, Alice and Bob wish to privately communicate their hands to each other via public announcements, without the advantage of a shared secret or public key infrastructure. Cathy should remain ignorant of all but her own cards after Alice and Bob have made their announcements. Notions for Cathy's ignorance in the literature range from Cathy not learning the fate of any individual card with certainty (weak $1$-security) to not gaining any probabilistic advantage in guessing the fate of some set of $\delta$ cards (perfect $\delta$-security). As we demonstrate, the generalized Russian cards problem has close ties to the field of combinatorial designs, on which we rely heavily, particularly for perfect security notions. Our main result establishes an equivalence between perfectly $\delta$-secure strategies and $(c+\delta)$-designs on $n$ points with block size $a$, when announcements are chosen uniformly at random from the set of possible announcements. We also provide construction methods and example solutions, including a construction that yields perfect $1$-security against Cathy when $c=2$. We leverage a known combinatorial design to construct a strategy with $a=8$, $b=13$, and $c=3$ that is perfectly $2$-secure. Finally, we consider a variant of the problem that yields solutions that are easy to construct and optimal with respect to both the number of announcements and level of security achieved. Moreover, this is the first method obtaining weak $\delta$-security that allows Alice to hold an arbitrary number of cards and Cathy to hold a set of $c = \lfloor \frac{a-\delta}{2} \rfloor$ cards. Alternatively, the construction yields solutions for arbitrary $\delta$, $c$ and any $a \geq \delta + 2c$.
[ { "created": "Tue, 7 Jan 2014 22:18:05 GMT", "version": "v1" }, { "created": "Tue, 5 Aug 2014 17:41:40 GMT", "version": "v2" } ]
2014-08-06
[ [ "Swanson", "Colleen M.", "" ], [ "Stinson", "Douglas R.", "" ] ]
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1401.1533
Devis Pantano
Devis Pantano
Proposta di nuovi strumenti per comprendere come funziona la cognizione (Novel tools to understand how cognition works)
In Italian
null
null
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
I think that the main reason why we do not understand the general principles of how knowledge works (and probably also the reason why we have not yet designed and built efficient machines capable of artificial intelligence), is not the excessive complexity of cognitive phenomena, but the lack of the conceptual and methodological tools to properly address the problem. It is like trying to build up Physics without the concept of number, or to understand the origin of species without including the mechanism of natural selection. In this paper I propose some new conceptual and methodological tools, which seem to offer a real opportunity to understand the logic of cognitive processes. I propose a new method to properly treat the concepts of structure and schema, and to perform on them operations of structural analysis. These operations allow to move straightforwardly from concrete to more abstract representations. With these tools I will suggest a definition for the concept of rule, of regularity and of emergent phenomena. From the analysis of some important aspects of the rules, I suggest to distinguish them in operational and associative rules. I propose that associative rules assume a dominant role in cognition. I also propose a definition for the concept of problem. At the end I will briefly illustrate a possible general model for cognitive systems.
[ { "created": "Tue, 7 Jan 2014 22:38:18 GMT", "version": "v1" }, { "created": "Mon, 27 Jan 2014 22:26:33 GMT", "version": "v2" }, { "created": "Fri, 18 Apr 2014 19:39:37 GMT", "version": "v3" } ]
2014-04-21
[ [ "Pantano", "Devis", "" ] ]
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1401.1534
Edriss Titi
Adam Larios and Edriss S. Titi
Global Regularity vs. Finite-Time Singularities: Some Paradigms on the Effect of Boundary Conditions and Certain Perturbations
null
null
null
null
math.AP physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In light of the question of finite-time blow-up vs. global well-posedness of solutions to problems involving nonlinear partial differential equations, we provide several cautionary examples which indicate that modifications to the boundary conditions or to the nonlinearity of the equations can effect whether the equations develop finite-time singularities. In particular, we aim to underscore the idea that in analytical and computational investigations of the blow-up of three-dimensional Euler and Navier-Stokes equations, the boundary conditions may need to be taken into greater account. We also examine a perturbation of the nonlinearity by dropping the advection term in the evolution of the derivative of the solutions to the viscous Burgers equation, which leads to the development of singularities not present in the original equation, and indicates that there is a regularizing mechanism in part of the nonlinearity. This simple analytical example corroborates recent computational observations in the singularity formation of fluid equations.
[ { "created": "Tue, 7 Jan 2014 22:41:16 GMT", "version": "v1" } ]
2014-01-09
[ [ "Larios", "Adam", "" ], [ "Titi", "Edriss S.", "" ] ]
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1401.1541
Lorna Stewart
Lorna Stewart and Richard Anthony Valenzano
On polygon numbers of circle graphs and distance hereditary graphs
27 pages, 8 figures
null
null
null
cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Circle graphs are intersection graphs of chords in a circle and $k$-polygon graphs are intersection graphs of chords in a convex $k$-sided polygon where each chord has its endpoints on distinct sides. The $k$-polygon graphs, for $k \ge 2$, form an infinite chain of graph classes, each of which contains the class of permutation graphs. The union of all of those graph classes is the class of circle graphs. The polygon number $\gp(G)$ of a circle graph $G$ is the minimum $k$ such that $G$ is a $k$-polygon graph. Given a circle graph $G$ and an integer $k$, determining whether $\gp(G) \le k$ is NP-complete, while the problem is solvable in polynomial time for fixed $k$. In this paper, we show that $\gp(G)$ is always at least as large as the asteroidal number of $G$, and equal to the asteroidal number of $G$ when $G$ is a connected distance hereditary graph that is not a clique. This implies that the classes of distance hereditary permutation graphs and distance hereditary AT-free graphs are the same, and we give a forbidden subgraph characterization of that class. We also establish the following upper bounds: $\gp(G)$ is at most the clique cover number of $G$ if $G$ is not a clique, at most 1 plus the independence number of $G$, and at most $\lceil n/2 \rceil$ where $n \ge 3$ is the number of vertices of $G$. Our results lead to linear time algorithms for finding the minimum number of corners that must be added to a given circle representation to produce a polygon representation, and for finding the asteroidal number of a distance hereditary graph, both of which are improvements over previous algorithms for those problems.
[ { "created": "Tue, 7 Jan 2014 23:17:25 GMT", "version": "v1" }, { "created": "Wed, 4 Oct 2017 21:38:49 GMT", "version": "v2" } ]
2017-10-06
[ [ "Stewart", "Lorna", "" ], [ "Valenzano", "Richard Anthony", "" ] ]
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1401.1542
Qudsia Quraishi
Qudsia Quraishi and Scott Diddams and Leo Hollberg
Optical phase-noise dynamics of Titanium:sapphire optical frequency combs
null
Optics Communications, Volume 320, 84 (2014)
10.1016/j.optcom.2014.01.030
null
physics.optics
http://creativecommons.org/licenses/publicdomain/
Stabilized optical frequency combs (OFC) can have remarkable levels of coherence across their broad spectral bandwidth. We study the scaling of the optical noise across hundreds of nanometers of optical spectra. We measure the residual phase noise between two OFC's (having offset frequencies $f^{(1)}_0 $ and $f^{(2)}_0$) referenced to a common cavity-stabilized narrow linewidth CW laser. Their relative offset frequency $ \Delta f_0 = f^{(2)}_0 - f^{(1)}_0 $, which appears across their entire spectra, provides a convenient measure of the phase noise. By comparing $\Delta f_0$ at different spectral regions, we demonstrate that the observed scaling of the residual phase noise is in very good agreement with the noise predicted from the standard frequency comb equation.
[ { "created": "Tue, 7 Jan 2014 23:21:09 GMT", "version": "v1" } ]
2017-03-09
[ [ "Quraishi", "Qudsia", "" ], [ "Diddams", "Scott", "" ], [ "Hollberg", "Leo", "" ] ]
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1401.1543
Falk Toeppel
Falk T\"oppel, Andrea Aiello, Christoph Marquardt, Elisabeth Giacobino, Gerd Leuchs
Classical entanglement in polarization metrology
12 pages + appendices, 3 figures
New J. Phys. 16, 073019 (2014)
10.1088/1367-2630/16/7/073019
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Quantum approaches relying on entangled photons have been recently proposed to increase the efficiency of optical measurements. We demonstrate here that, surprisingly, the use of classical light with entangled degrees of freedom can also bring outstanding advantages over conventional measurements in polarization metrology. Specifically, we show that radially polarized beams of light allow to perform real-time single-shot Mueller matrix polarimetry. Our results also indicate that quantum optical procedures requiring entanglement without nonlocality can be actually achieved in classical optics regime.
[ { "created": "Tue, 7 Jan 2014 23:42:40 GMT", "version": "v1" }, { "created": "Mon, 24 Feb 2014 17:26:25 GMT", "version": "v2" }, { "created": "Tue, 25 Feb 2014 08:19:28 GMT", "version": "v3" }, { "created": "Thu, 3 Apr 2014 12:37:51 GMT", "version": "v4" } ]
2015-06-18
[ [ "Töppel", "Falk", "" ], [ "Aiello", "Andrea", "" ], [ "Marquardt", "Christoph", "" ], [ "Giacobino", "Elisabeth", "" ], [ "Leuchs", "Gerd", "" ] ]
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1401.1545
Valery Ugrinovskii
V. Ugrinovskii and E. Fridman
A Round-Robin Protocol for Distributed Estimation with $H_\infty$ Consensus
A version of this paper has been presented at the 52nd IEEE CDC, Florence, Italy
null
null
null
math.OC cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The paper considers a distributed robust estimation problem over a network with directed topology involving continuous time observers. While measurements are available to the observers continuously, the nodes interact according to a Round-Robin rule, at discrete time instances. The results of the paper are sufficient conditions which guarantee a suboptimal $H_\infty$ level of consensus between observers with sampled interconnections.
[ { "created": "Tue, 7 Jan 2014 23:48:02 GMT", "version": "v1" } ]
2014-01-09
[ [ "Ugrinovskii", "V.", "" ], [ "Fridman", "E.", "" ] ]
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1401.1549
Zheng Wen
Zheng Wen, Daniel O'Neill and Hamid Reza Maei
Optimal Demand Response Using Device Based Reinforcement Learning
null
null
null
null
cs.LG cs.AI cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Demand response (DR) for residential and small commercial buildings is estimated to account for as much as 65% of the total energy savings potential of DR, and previous work shows that a fully automated Energy Management System (EMS) is a necessary prerequisite to DR in these areas. In this paper, we propose a novel EMS formulation for DR problems in these sectors. Specifically, we formulate a fully automated EMS's rescheduling problem as a reinforcement learning (RL) problem, and argue that this RL problem can be approximately solved by decomposing it over device clusters. Compared with existing formulations, our new formulation (1) does not require explicitly modeling the user's dissatisfaction on job rescheduling, (2) enables the EMS to self-initiate jobs, (3) allows the user to initiate more flexible requests and (4) has a computational complexity linear in the number of devices. We also demonstrate the simulation results of applying Q-learning, one of the most popular and classical RL algorithms, to a representative example.
[ { "created": "Wed, 8 Jan 2014 00:49:01 GMT", "version": "v1" }, { "created": "Sat, 28 Jun 2014 04:24:47 GMT", "version": "v2" } ]
2014-10-07
[ [ "Wen", "Zheng", "" ], [ "O'Neill", "Daniel", "" ], [ "Maei", "Hamid Reza", "" ] ]
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1401.1550
Sile Nic Chormaic
Ivan Gusachenko, Mary C. Frawley, Viet Giang Truong and Sile Nic Chormaic
Optical nanofiber integrated into an optical tweezers for particle manipulation and in-situ fiber probing
7 pages, 4 figures
null
10.1117/12.2061442
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Precise control of particle positioning is desirable in many optical propulsion and sorting applications. Here, we develop an integrated platform for particle manipulation consisting of a combined optical nanofiber and optical tweezers system. Individual silica microspheres were introduced to the nanofiber at arbitrary points using the optical tweezers, thereby producing pronounced dips in the fiber transmission. We show that such consistent and reversible transmission modulations depend on both particle and fiber diameter, and may be used as a reference point for in-situ nanofiber or particle size measurement. Therefore we combine SEM size measurements with nanofiber transmission data to provide calibration for particle-based fiber assessment. We also demonstrate how the optical tweezers can be used to create a particle jet to feed a supply of microspheres to the nanofiber surface, forming a particle conveyor belt. This integrated optical platform provides a method for selective evanescent field manipulation of micron-sized particles and facilitates studies of optical binding and light-particle interaction dynamics.
[ { "created": "Wed, 8 Jan 2014 00:51:33 GMT", "version": "v1" }, { "created": "Tue, 22 Jul 2014 23:48:06 GMT", "version": "v2" } ]
2015-06-18
[ [ "Gusachenko", "Ivan", "" ], [ "Frawley", "Mary C.", "" ], [ "Truong", "Viet Giang", "" ], [ "Chormaic", "Sile Nic", "" ] ]
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1401.1551
Alessandro Checco
Alessandro Checco, Carlo Lancia, Douglas J. Leith
Updating Neighbour Cell List via Crowdsourced User Reports: a Framework for Measuring Time Performance
null
null
10.1155/2018/9028427
null
cs.NI cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we introduce the idea of estimating local topology in wireless networks by means of crowdsourced user reports. In this approach each user periodically reports to the serving basestation information about the set of neighbouring basestations observed by the user. We show that, by mapping the local topological structure of the network onto states of increasing knowledge, a crisp mathematical framework can be obtained, which allows in turn for the use of a variety of user mobility models. Using a simplified mobility model we show how obtain useful upper bounds on the expected time for a basestation to gain full knowledge of its local neighbourhood, answering the fundamental question about which classes of network deployments can effectively benefit from a crowdsourcing approach.
[ { "created": "Wed, 8 Jan 2014 00:54:12 GMT", "version": "v1" }, { "created": "Mon, 6 Oct 2014 22:47:12 GMT", "version": "v2" }, { "created": "Wed, 20 Nov 2019 17:36:34 GMT", "version": "v3" } ]
2019-11-21
[ [ "Checco", "Alessandro", "" ], [ "Lancia", "Carlo", "" ], [ "Leith", "Douglas J.", "" ] ]
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1401.1558
Ming Yan
Zhitao Fan and Feng Guan and Chunlin Wu and Ming Yan
The Continuity of Images by Transmission Imaging Revisited
23 pages, 8 figures
null
null
null
math.DG cs.CV math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Transmission imaging, as an important imaging technique widely used in astronomy, medical diagnosis, and biology science, has been shown in [49] quite different from reflection imaging used in our everyday life. Understanding the structures of images (the prior information) is important for designing, testing, and choosing image processing methods, and good image processing methods are helpful for further uses of the image data, e.g., increasing the accuracy of the object reconstruction methods in transmission imaging applications. In reflection imaging, the images are usually modeled as discontinuous functions and even piecewise constant functions. In transmission imaging, it was shown very recently in [49] that almost all images are continuous functions. However, the author in [49] considered only the case of parallel beam geometry and used some too strong assumptions in the proof, which exclude some common cases such as cylindrical objects. In this paper, we consider more general beam geometries and simplify the assumptions by using totally different techniques. In particular, we will prove that almost all images in transmission imaging with both parallel and divergent beam geometries (two most typical beam geometries) are continuous functions, under much weaker assumptions than those in [49], which admit almost all practical cases. Besides, taking into accounts our analysis, we compare two image processing methods for Poisson noise (which is the most significant noise in transmission imaging) removal. Numerical experiments will be provided to demonstrate our analysis.
[ { "created": "Wed, 8 Jan 2014 01:50:55 GMT", "version": "v1" } ]
2014-01-09
[ [ "Fan", "Zhitao", "" ], [ "Guan", "Feng", "" ], [ "Wu", "Chunlin", "" ], [ "Yan", "Ming", "" ] ]
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1401.1559
Renato Paes Leme
Moshe Babaioff and Noam Nisan and Renato Paes Leme
Price Competition in Online Combinatorial Markets
accept to WWW'14 (23rd International World Wide Web Conference)
null
null
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a single buyer with a combinatorial preference that would like to purchase related products and services from different vendors, where each vendor supplies exactly one product. We study the general case where subsets of products can be substitutes as well as complementary and analyze the game that is induced on the vendors, where a vendor's strategy is the price that he asks for his product. This model generalizes both Bertrand competition (where vendors are perfect substitutes) and Nash bargaining (where they are perfect complements), and captures a wide variety of scenarios that can appear in complex crowd sourcing or in automatic pricing of related products. We study the equilibria of such games and show that a pure efficient equilibrium always exists. In the case of submodular buyer preferences we fully characterize the set of pure Nash equilibria, essentially showing uniqueness. For the even more restricted "substitutes" buyer preferences we also prove uniqueness over {\em mixed} equilibria. Finally we begin the exploration of natural generalizations of our setting such as when services have costs, when there are multiple buyers or uncertainty about the the buyer's valuation, and when a single vendor supplies multiple products.
[ { "created": "Wed, 8 Jan 2014 01:59:03 GMT", "version": "v1" } ]
2014-01-09
[ [ "Babaioff", "Moshe", "" ], [ "Nisan", "Noam", "" ], [ "Leme", "Renato Paes", "" ] ]
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1401.1560
Tao Xiong
Tao Xiong, Yukun Bao, Zhongyi Hu
Beyond One-Step-Ahead Forecasting: Evaluation of Alternative Multi-Step-Ahead Forecasting Models for Crude Oil Prices
32 pages
Energy Economics. 40, 2013: 405-415
10.1016/j.eneco.2013.07.028
null
cs.LG cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An accurate prediction of crude oil prices over long future horizons is challenging and of great interest to governments, enterprises, and investors. This paper proposes a revised hybrid model built upon empirical mode decomposition (EMD) based on the feed-forward neural network (FNN) modeling framework incorporating the slope-based method (SBM), which is capable of capturing the complex dynamic of crude oil prices. Three commonly used multi-step-ahead prediction strategies proposed in the literature, including iterated strategy, direct strategy, and MIMO (multiple-input multiple-output) strategy, are examined and compared, and practical considerations for the selection of a prediction strategy for multi-step-ahead forecasting relating to crude oil prices are identified. The weekly data from the WTI (West Texas Intermediate) crude oil spot price are used to compare the performance of the alternative models under the EMD-SBM-FNN modeling framework with selected counterparts. The quantitative and comprehensive assessments are performed on the basis of prediction accuracy and computational cost. The results obtained in this study indicate that the proposed EMD-SBM-FNN model using the MIMO strategy is the best in terms of prediction accuracy with accredited computational load.
[ { "created": "Wed, 8 Jan 2014 01:59:53 GMT", "version": "v1" } ]
2014-01-10
[ [ "Xiong", "Tao", "" ], [ "Bao", "Yukun", "" ], [ "Hu", "Zhongyi", "" ] ]
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1401.1568
Seung Ki Baek
Seung Ki Baek, Il Gu Yi, Hye Jin Park, and Beom Jun Kim
Universal statistics of the knockout tournament
16 pages, 14 figures
Sci. Rep. 3, 3198 (2013)
10.1038/srep03198
null
physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study statistics of the knockout tournament, where only the winner of a fixture progresses to the next. We assign a real number called competitiveness to each contestant and find that the resulting distribution of prize money follows a power law with an exponent close to unity if the competitiveness is a stable quantity and a decisive factor to win a match. Otherwise, the distribution is found narrow. The existing observation of power law distributions in various kinds of real sports tournaments therefore suggests that the rules of those games are constructed in such a way that it is possible to understand the games in terms of the contestants' inherent characteristics of competitiveness.
[ { "created": "Wed, 8 Jan 2014 02:59:13 GMT", "version": "v1" } ]
2014-01-09
[ [ "Baek", "Seung Ki", "" ], [ "Yi", "Il Gu", "" ], [ "Park", "Hye Jin", "" ], [ "Kim", "Beom Jun", "" ] ]
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1401.1572
Aravindhan Ganesan Dr
Aravindhan Ganesan, Narges Mohammadi and Feng Wang
From building blocks of proteins to drugs: A quantum chemical study on structure-property relationships of phenylalanine, tyrosine and dopa
null
null
null
null
physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Density functional theory and ab initio methods have been employed to address the impacts of hydroxyl (OH) group substitutions on the physico-chemical properties of levodopa (or L-dopa) against the natural amino acids, phenylalanine and tyrosine. L-dopa, which is an important therapeutic drug for Parkinson's disease, shares structural homology with the amino acids, whose structures differ only by OH substitutions in their phenyl side chains. It is revealed that the backbone geometries of the aromatic molecules do not show apparent OH-dependent differences; however, their other molecular-level properties, such as molecular dipole moment, electronic properties and aromaticity, change significantly. The core binding energy spectra indicate that the atom sites that undergo modifications exhibit large energy shifts, so as to accommodate the changes in the intra-molecular chemical environment of the molecules. The binding energies of the modified C 1s sites in the molecules shift as much as 1.8 eV, whereas the electronic changes in their O 1s spectra happen in the higher energy region (ca. 536 eV). The valence spectra provide enhanced insights on the reactivity and chemical properties of the aromatic molecules. The impacts of OH moieties on the valence spectra are predominantly focussed in the energy band<16 eV, where the frontier molecular orbitals display much reorganization and energy shifts from the amino acids to L-dopa. Of the three molecules, L-dopa also has the least HOMO-LUMO energy gap, which can readily explain its proactivity as a drug compound. Furthermore, the nuclear independent chemical shift calculations suggest that L-dopa also has more aromaticity features than those of the amino acids. The OH groups, therefore, play a more prominent role in shaping the physico-chemical properties of L-dopa, which significantly improve its drug potency.
[ { "created": "Wed, 8 Jan 2014 03:41:57 GMT", "version": "v1" } ]
2014-01-09
[ [ "Ganesan", "Aravindhan", "" ], [ "Mohammadi", "Narges", "" ], [ "Wang", "Feng", "" ] ]
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1401.1573
Xue Gong Deng
Xuegong Deng
The security deposit for finitely repeated Prisoner's dilemma
null
null
null
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Under the assumption of complete rationality, Nash equilibrium is the only reasonable strategy (set) of the finitely repeated prisoner's dilemma. In fact, some strategies only slightly deviate from the so-called rationality, and the corresponding payoff may much better than that of Nash equilibrium. This article points out, even under the rational assumptions, the players have reason to seek a mutually beneficial agreement (Pareto dominated compare to Nash equilibrium) and a weak and optional constraints, so that the agreement can be successfully implemented. If the constraint does not harm the interests of the participants, or the adversely affects of the constraint are negligible, then the finitely repeated prisoner's dilemma becomes a bargaining problem issues on the strategy sequences and the problem to seek the constraints. The quantification of the constraints, the so-called security deposit in this paper, is nearly a concept of distance from an agreement (a strategy set) to the complete rationality.
[ { "created": "Wed, 8 Jan 2014 03:50:39 GMT", "version": "v1" } ]
2014-01-09
[ [ "Deng", "Xuegong", "" ] ]
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1401.1577
Quan Quan
Quan Quan, Lu Jiang and Kai-Yuan Cai
Discrete-Time Output-Feedback Robust Repetitive Control for a Class of Nonlinear Systems by Additive State Decomposition
15 pages
null
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The discrete-time robust repetitive control (RC, or repetitive controller, also designated RC) problem for nonlinear systems is both challenging and practical. This paper proposes a discrete-time output-feedback RC design for a class of systems subject to measurable nonlinearities to track reference robustly with respect to the period variation. The design relies on additive state decomposition, by which the output-feedback RC problem is decomposed into an output-feedback RC problem for a linear time-invariant system and a state-feedback stabilization problem for a nonlinear system. Thanks to the decomposition, existing controller design methods in both the frequency domain and time domain can be employed to make the robustness and discretization for a nonlinear system tractable. To demonstrate the effectiveness, an illustrative example is given.
[ { "created": "Wed, 8 Jan 2014 04:22:47 GMT", "version": "v1" } ]
2014-01-09
[ [ "Quan", "Quan", "" ], [ "Jiang", "Lu", "" ], [ "Cai", "Kai-Yuan", "" ] ]
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1401.1580
Quan Quan
Quan Quan and Kai-Yuan Cai
A New Causal Ideal Internal Dynamics Generator
16 pages
International Journal of Robust and Nonlinear Control. 2017, 27(12):2086-2101
10.1002/rnc.3672
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The design of ideal internal dynamics (IID) generators, namely solving IID, is a fundamental problem, which is a key step to handle the nonminimum-phase output tracking problem. In this paper, for a class of unstable matrix differential equations, a new causal dynamic IID generator is proposed, whose parameters are partly chosen via H_2/H_inf optimization. Compared with existing similar generators, it is applicable to matrix differential equations with singular system matrices and is easily extended to slowly time-varying matrix differential equations without extra computation.
[ { "created": "Wed, 8 Jan 2014 04:45:52 GMT", "version": "v1" } ]
2020-03-10
[ [ "Quan", "Quan", "" ], [ "Cai", "Kai-Yuan", "" ] ]
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1401.1587
Byungjoon Min
Byungjoon Min and K.-I. Goh
Multiple resource demands and viability in multiplex networks
4 pages, 3 figures, accepted for publication in Phys. Rev. E
Phys. Rev. E 89, 040802(R) (2014)
10.1103/PhysRevE.89.040802
null
physics.soc-ph cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Many complex systems demand manifold resources to be supplied from distinct channels to function properly, i.e, water, gas, and electricity for a city. Here, we study a model for viability of such systems demanding more than one type of vital resources produced and distributed by resource nodes in multiplex networks. We found a rich variety of behaviors such as discontinuity, bistability, and hysteresis in the fraction of viable nodes with respect to the density of networks and the fraction of resource nodes. Our result suggests that viability in multiplex networks is not only exposed to the risk of abrupt collapse but also suffers excessive complication in recovery.
[ { "created": "Wed, 8 Jan 2014 06:03:30 GMT", "version": "v1" }, { "created": "Mon, 21 Apr 2014 02:41:09 GMT", "version": "v2" } ]
2014-05-02
[ [ "Min", "Byungjoon", "" ], [ "Goh", "K. -I.", "" ] ]
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1401.1591
Tibor Toth-Katona
Istv\'an J\'anossy, Katalin Fodor-Csorba, Anik\'o Vajda and Tibor T\'oth-Katona
Laser-induced instabilities in liquid crystal cells with a photosensitive substrate
to appear in Phys. Rev. E
null
10.1103/PhysRevE.89.012504
null
cond-mat.soft physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Liquid crystal layers sandwiched between a reference plate and a photosensitive substrate were investigated. We focused on the reverse geometry, where the cell was illuminated by a laser beam from the reference side. In planar cells instabilities occurred, static and dynamic ones, depending on the angle between the laser polarization and the director orientation on the reference plate. In cells where the molecules were aligned along the normal of the reference plate, dynamic pattern was observed at all angles of polarization. A simple model based on a photo-induced surface torque gives account of the findings. Light scattering studies revealed some basic properties of the instabilities.
[ { "created": "Wed, 8 Jan 2014 07:48:43 GMT", "version": "v1" } ]
2015-06-18
[ [ "Jánossy", "István", "" ], [ "Fodor-Csorba", "Katalin", "" ], [ "Vajda", "Anikó", "" ], [ "Tóth-Katona", "Tibor", "" ] ]
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1401.1592
Tibor Toth-Katona
I. J\'anossy, K. Fodor-Csorba, A. Vajda, L.O. Palomares and T. T\'oth-Katona
Light-induced instabilities in photo-oriented liquid crystal cells
to appear in Mol. Cryst. Liq. Cryst
null
null
null
cond-mat.soft physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In a planar liquid crystal sample sandwiched between a photosensitive and a reference plate instabilities occurred, when the cell was illuminated from the reference side. The instabilities were induced both by polarized white light source and monochromatic laser beams. Static and dynamic regimes were found; for laser irradiation dynamic instability was found only in a range of polarization directions. A model, developed for monochromatic excitation, predicts that at certain thicknesses dynamic instability is forbidden. Experiments on a wedge-like cell confirmed this conclusion.
[ { "created": "Wed, 8 Jan 2014 07:54:50 GMT", "version": "v1" } ]
2014-01-09
[ [ "Jánossy", "I.", "" ], [ "Fodor-Csorba", "K.", "" ], [ "Vajda", "A.", "" ], [ "Palomares", "L. O.", "" ], [ "Tóth-Katona", "T.", "" ] ]
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1401.1603
Primo\v{z} Peterlin
Ignasi M\'endez, Primo\v{z} Peterlin, Rihard Hudej, Andrej Strojnik, Bo\v{z}idar Casar
On multichannel film dosimetry with channel-independent perturbations
11 pages, 2 figures
Medical Physics 41(1):011705 (2014)
10.1118/1.4845095
null
physics.med-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Purpose: Different multichannel methods for film dosimetry have been proposed in the literature. Two of them are the weighted mean method and the method put forth by Micke et al and Mayer et al. The purpose of this work was to compare their results and to develop a generalized channel-independent perturbations framework in which both methods enter as special cases. Methods: Four models of channel-independent perturbations were compared: weighted mean, Micke-Mayer method, uniform distribution and truncated normal distribution. A closed-form formula to calculate film doses and the associated Type B uncertainty for all four models was deduced. To evaluate the models, film dose distributions were compared with planned and measured dose distributions. At the same time, several elements of the dosimetry process were compared: film type EBT2 versus EBT3, different waiting-time windows, reflection mode versus transmission mode scanning, and planned versus measured dose distribution for film calibration and for gamma-index analysis. The methods and the models described in this study are publicly accessible through IRISEU. Alpha 1.1 (http://www.iriseu.com). IRISEU. is a cloud computing web application for calibration and dosimetry of radiochromic films. Results: The truncated normal distribution model provided the best agreement between film and reference doses, both for calibration and gamma-index verification, and proved itself superior to both the weighted mean model, which neglects correlations between the channels, and the Micke-Mayer model, whose accuracy depends on the properties of the sensitometric curves. Conclusions: The truncated normal distribution model of channel-independent perturbations was found superior to the other three models under comparison and we propose its use for multichannel dosimetry.
[ { "created": "Wed, 8 Jan 2014 08:35:09 GMT", "version": "v1" } ]
2014-01-09
[ [ "Méndez", "Ignasi", "" ], [ "Peterlin", "Primož", "" ], [ "Hudej", "Rihard", "" ], [ "Strojnik", "Andrej", "" ], [ "Casar", "Božidar", "" ] ]
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1401.1605
James Hensman
James Hensman and Magnus Rattray and Neil D. Lawrence
Fast nonparametric clustering of structured time-series
Accepted for publication in special edition of TPAMI on Bayesian Nonparametrics
null
null
null
cs.LG cs.CV stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this publication, we combine two Bayesian non-parametric models: the Gaussian Process (GP) and the Dirichlet Process (DP). Our innovation in the GP model is to introduce a variation on the GP prior which enables us to model structured time-series data, i.e. data containing groups where we wish to model inter- and intra-group variability. Our innovation in the DP model is an implementation of a new fast collapsed variational inference procedure which enables us to optimize our variationala pproximation significantly faster than standard VB approaches. In a biological time series application we show how our model better captures salient features of the data, leading to better consistency with existing biological classifications, while the associated inference algorithm provides a twofold speed-up over EM-based variational inference.
[ { "created": "Wed, 8 Jan 2014 08:47:44 GMT", "version": "v1" }, { "created": "Mon, 14 Apr 2014 08:04:46 GMT", "version": "v2" } ]
2014-04-15
[ [ "Hensman", "James", "" ], [ "Rattray", "Magnus", "" ], [ "Lawrence", "Neil D.", "" ] ]
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1401.1619
Vincenzo Galdi
Silvio Savoia, Giuseppe Castaldi, Vincenzo Galdi, Andrea Alu', Nader Engheta
Tunneling of Obliquely-Incident Waves through PT-Symmetric Epsilon-Near-Zero Bi-Layers
11 pages, 12 figures (minor revisions in the text and figures)
null
10.1103/PhysRevB.89.085105
null
physics.optics cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that obliquely-incident, transversely-magnetic-polarized plane waves can be totally transmitted (with zero reflection) through epsilon-near-zero (ENZ) bi-layers characterized by balanced loss and gain with parity-time (PT) symmetry. This tunneling phenomenon is mediated by the excitation of a surface-wave localized at the interface separating the loss and gain regions. We determine the parameter configurations for which the phenomenon may occur and, in particular, the relationship between the incidence direction and the electrical thickness. We show that, below a critical threshold of gain and loss, there always exists a tunneling angle which, for moderately thick (wavelength-sized) structures, approaches a critical value dictated by the surface-wave phase-matching condition. We also investigate the unidirectional character of the tunneling phenomenon, as well as the possible onset of spontaneous symmetry breaking, typical of PT-symmetric systems. Our results constitute an interesting example of a PT-symmetry-induced tunneling phenomenon, and may open up intriguing venues in the applications of ENZ materials featuring loss and gain.
[ { "created": "Wed, 8 Jan 2014 09:05:52 GMT", "version": "v1" }, { "created": "Mon, 20 Jan 2014 11:46:11 GMT", "version": "v2" }, { "created": "Mon, 3 Feb 2014 13:43:57 GMT", "version": "v3" } ]
2015-06-18
[ [ "Savoia", "Silvio", "" ], [ "Castaldi", "Giuseppe", "" ], [ "Galdi", "Vincenzo", "" ], [ "Alu'", "Andrea", "" ], [ "Engheta", "Nader", "" ] ]
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1401.1623
Marco Pizzocaro
Marco Pizzocaro, Davide Calonico, Pablo Cancio Pastor, Jacopo Catani, Giovanni A. Costanzo, Filippo Levi and Luca Lorini
Efficient Frequency Doubling at 399 nm
null
Applied Optics, Vol. 53, Issue 16, pp. 3388-3392 (2014)
10.1364/AO.53.003388
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This article describes a high-power and narrow-linewidth laser source at 399 nm useful for cooling and trapping of ytterbium atoms. A continuous-wave titanium-sapphire laser at 798 nm is frequency doubled using a lithium triborate crystal in an enhancement cavity. Up to 1.0 W of light at 399 nm has been obtained from 1.3 W of infrared light, with an efficiency of 80 % This paper was published in Applied Optics and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/ao/abstract.cfm?uri=ao-53-16-3388. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
[ { "created": "Wed, 8 Jan 2014 09:11:08 GMT", "version": "v1" }, { "created": "Fri, 31 Jan 2014 09:29:25 GMT", "version": "v2" }, { "created": "Wed, 21 May 2014 15:21:30 GMT", "version": "v3" } ]
2014-05-22
[ [ "Pizzocaro", "Marco", "" ], [ "Calonico", "Davide", "" ], [ "Pastor", "Pablo Cancio", "" ], [ "Catani", "Jacopo", "" ], [ "Costanzo", "Giovanni A.", "" ], [ "Levi", "Filippo", "" ], [ "Lorini", "Luca", "" ] ]
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1401.1626
Enrico Paolini
Enrico Paolini, Gianluigi Liva, Marco Chiani
Coded Slotted ALOHA: A Graph-Based Method for Uncoordinated Multiple Access
The final version to appear in IEEE Trans. Inf. Theory. 18 pages, 10 figures
null
10.1109/TIT.2015.2492579
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, a random access scheme is introduced which relies on the combination of packet erasure correcting codes and successive interference cancellation (SIC). The scheme is named coded slotted ALOHA. A bipartite graph representation of the SIC process, resembling iterative decoding of generalized low-density parity-check codes over the erasure channel, is exploited to optimize the selection probabilities of the component erasure correcting codes via density evolution analysis. The capacity (in packets per slot) of the scheme is then analyzed in the context of the collision channel without feedback. Moreover, a capacity bound is developed and component code distributions tightly approaching the bound are derived.
[ { "created": "Wed, 8 Jan 2014 09:24:08 GMT", "version": "v1" }, { "created": "Wed, 30 Sep 2015 09:16:33 GMT", "version": "v2" } ]
2016-11-15
[ [ "Paolini", "Enrico", "" ], [ "Liva", "Gianluigi", "" ], [ "Chiani", "Marco", "" ] ]
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1401.1632
Eduardo Vega-Fuentes
E. Vega-Fuentes, S. Leon-del Rosario, J.M. Cerezo-Sanchez, A. Vega-Martinez
Fuzzy Inference System for VOLT/VAR control in distribution substations in isolated power systems
null
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null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a fuzzy inference system for voltage/reactive power control in distribution substations. The purpose is go forward to automation distribution and its implementation in isolated power systems where control capabilities are limited and it is common using the same applications as in continental power systems. This means that lot of functionalities do not apply and computational burden generates high response times. A fuzzy controller, with logic guidelines embedded based upon heuristic rules resulting from operators at dispatch control center past experience, has been designed. Working as an on-line tool, it has been tested under real conditions and it has managed the operation during a whole day in a distribution substation. Within the limits of control capabilities of the system, the controller maintained successfully an acceptable voltage profile, power factor values over 0,98 and it has ostensibly improved the performance given by an optimal power flow based automation system.
[ { "created": "Wed, 8 Jan 2014 09:39:38 GMT", "version": "v1" } ]
2014-01-09
[ [ "Vega-Fuentes", "E.", "" ], [ "Rosario", "S. Leon-del", "" ], [ "Cerezo-Sanchez", "J. M.", "" ], [ "Vega-Martinez", "A.", "" ] ]
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1401.1644
Fernando Falceto
J. G. Esteve and F. Falceto
Neutrino mass and Extreme Value Distributions in $\beta$-decay
6 pages, 3 figures; published version
J. Phys. G: Nucl. Part. Phys. 41 (2014) 055011
10.1088/0954-3899/41/5/055011
null
physics.data-an nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a new application of the Extreme Value Theory for distributions with compact support. The novelty of our proposal is the use of these tools to estimate the neutrino mass from the energy spectrum of electrons in $\beta$-decay. In this way the dependence of the result on the mass of the neutrino is considerably enhanced increasing the sensitivity of the experiment.
[ { "created": "Wed, 8 Jan 2014 10:17:18 GMT", "version": "v1" }, { "created": "Fri, 11 Apr 2014 12:34:01 GMT", "version": "v2" } ]
2015-06-18
[ [ "Esteve", "J. G.", "" ], [ "Falceto", "F.", "" ] ]
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1401.1646
Oliver Matula
Oliver Matula, Armen G. Hayrapetyan, Valeriy G. Serbo, Andrey Surzhykov, Stephan Fritzsche
Radiative Capture of Twisted Electrons by Bare Ions
5 pages, 3 figures
null
10.1088/1367-2630/16/5/053024
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent advances in the production of twisted electron beams with a subnanometer spot size offer unique opportunities to explore the role of orbital angular momentum (OAM) in basic atomic processes. In the present work, we address one of these processes: radiative recombination of twisted electrons with bare ions. Based on the density matrix formalism and the non-relativistic Schr\"odinger theory, analytical expressions are derived for the angular distribution and the linear polarization of photons emitted due to the capture of twisted electrons into the ground state of (hydrogen-like) ions. We show that these angular and polarization distributions are sensitive to both, the transverse momentum and the topological charge of the electron beam. To observe in particular the value of this charge, we propose an experiment that makes use of the coherent superposition of two twisted beams.
[ { "created": "Wed, 8 Jan 2014 10:20:10 GMT", "version": "v1" } ]
2015-06-18
[ [ "Matula", "Oliver", "" ], [ "Hayrapetyan", "Armen G.", "" ], [ "Serbo", "Valeriy G.", "" ], [ "Surzhykov", "Andrey", "" ], [ "Fritzsche", "Stephan", "" ] ]
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1401.1655
Titus Sandu
Titus Sandu, George Boldeiu, and Victor Moagar-Poladian
Applications of electrostatic capacitance and charging
7 pages, 7 figures. arXiv admin note: text overlap with arXiv:1304.6624
Journal of Applied Physics 114, 224904 (2013)
10.1063/1.4847495
null
cond-mat.mes-hall physics.bio-ph physics.chem-ph physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The capacitance of an arbitrarily shaped object is calculated with the same second-kind integral equation method used for computing static and dynamic polarizabilities. The capacitance is simply the dielectric permittivity multiplied by the area of the object and divided by the squared norm of the Neumann-Poincar\'{e} operator eigenfunction corresponding to the largest eigenvalue. The norm of this eigenfunction varies slowly with shape thus enabling the definition of two scale-invariant shape factors and perturbative calculations of capacitance. The result is extended to a special class of capacitors in which the electrodes are the equipotential surfaces generated by the equilibrium charge on the object. This extention allows analytical expressions of capacitance for confocal spheroidal capacitors and finite cylinders. Moreover, a second order formula for thin constant-thickness capacitors is given with direct applications for capacitance of membranes in living cells and of supercapacitors. For axisymmetric geometries a fast and accurate numerical method is provided.
[ { "created": "Wed, 8 Jan 2014 10:59:34 GMT", "version": "v1" } ]
2014-01-09
[ [ "Sandu", "Titus", "" ], [ "Boldeiu", "George", "" ], [ "Moagar-Poladian", "Victor", "" ] ]
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1401.1659
Mark Zentile
Mark A Zentile, Rebecca Andrews, Lee Weller, Svenja Knappe, Charles S Adams and Ifan G Hughes
The hyperfine Paschen-Back Faraday effect
8 pages, 4 figures
J. Phys. B: At. Mol. Opt. Phys. 47, 075005 (2014)
10.1088/0953-4075/47/7/075005
null
physics.atom-ph physics.optics quant-ph
http://creativecommons.org/licenses/by/3.0/
We investigate experimentally and theoretically the Faraday effect in an atomic medium in the hyperfine Paschen-Back regime, where the Zeeman interaction is larger than the hyperfine splitting. We use a small permanent magnet and a micro-fabricated vapour cell, giving magnetic fields of the order of a Tesla. We show that for low absorption and small rotation angles, the refractive index is well approximated by the Faraday rotation signal, giving a simple way to measure the atomic refractive index. Fitting to the atomic spectra, we achieve magnetic field sensitivity at the $10^{-4}$ level. Finally we note that the Faraday signal shows zero crossings which can be used as temperature insensitive error signals for laser frequency stabilisation at large detuning. The theoretical sensitivity for $^{87}$Rb is found to be $\sim 40$ kHz/$^\circ$C.
[ { "created": "Wed, 8 Jan 2014 11:08:02 GMT", "version": "v1" }, { "created": "Wed, 26 Mar 2014 10:23:03 GMT", "version": "v2" } ]
2014-03-27
[ [ "Zentile", "Mark A", "" ], [ "Andrews", "Rebecca", "" ], [ "Weller", "Lee", "" ], [ "Knappe", "Svenja", "" ], [ "Adams", "Charles S", "" ], [ "Hughes", "Ifan G", "" ] ]
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1401.1660
Georg Weidenspointner
Georg Weidenspointner, Matej Batic, Steffen Hauf, Gabriela Hoff, Markus Kuster, Maria Grazia Pia, and Paolo Saracco
Validation of Compton Scattering Monte Carlo Simulation Models
5 pages, 3 figures, to be published in the Proceedings of IEEE Nuclear Science Symposium 2013
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physics.comp-ph astro-ph.IM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Several models for the Monte Carlo simulation of Compton scattering on electrons are quantitatively evaluated with respect to a large collection of experimental data retrieved from the literature. Some of these models are currently implemented in general purpose Monte Carlo systems; some have been implemented and evaluated for possible use in Monte Carlo particle transport for the first time in this study. Here we present first and preliminary results concerning total and differential Compton scattering cross sections.
[ { "created": "Wed, 8 Jan 2014 11:08:54 GMT", "version": "v1" } ]
2014-01-09
[ [ "Weidenspointner", "Georg", "" ], [ "Batic", "Matej", "" ], [ "Hauf", "Steffen", "" ], [ "Hoff", "Gabriela", "" ], [ "Kuster", "Markus", "" ], [ "Pia", "Maria Grazia", "" ], [ "Saracco", "Paolo", "" ] ]
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1401.1661
Tao Zhu
Tao Zhu, Shihong Huang, Leilei Shi, Lei Gao, Wei Huang, Baomei Zhang
Ultra-narrow Linewidth Fiber Laser with Self-injection Feedback Based on Rayleigh Backscattering
5 pages, 6 figures
null
null
null
physics.optics
http://creativecommons.org/licenses/by-nc-sa/3.0/
A single longitudinal mode fiber laser with ultra-narrow linewidth based on self-injection feedback by using the linewidth compress mechanism of Rayleigh backscattering (RBS) are proposed and demonstrated. Since the linewidth of RBS is narrower than that of the incident light in optical fibers and they have the same centre wavelength, the RBS can act as a mechanism to compress the linewidth of the incident light in fiber ring laser. In addition, more RBS signal could be collected to help further compress the laser linewidth besides the free spectral range is expanded when the self-injection feedback method is used. Our experimental results show that the side-mode suppression ratio of our laser is up to 75dB and the laser linewidth could be low to ~130Hz.
[ { "created": "Wed, 8 Jan 2014 11:10:41 GMT", "version": "v1" } ]
2014-01-09
[ [ "Zhu", "Tao", "" ], [ "Huang", "Shihong", "" ], [ "Shi", "Leilei", "" ], [ "Gao", "Lei", "" ], [ "Huang", "Wei", "" ], [ "Zhang", "Baomei", "" ] ]
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1401.1669
J. G. Wolff
J. Gerard Wolff
Smart machines and the SP theory of intelligence
arXiv admin note: substantial text overlap with arXiv:1306.3890
null
null
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
These notes describe how the "SP theory of intelligence", and its embodiment in the "SP machine", may help to realise cognitive computing, as described in the book "Smart Machines". In the SP system, information compression and a concept of "multiple alignment" are centre stage. The system is designed to integrate such things as unsupervised learning, pattern recognition, probabilistic reasoning, and more. It may help to overcome the problem of variety in big data, it may serve in pattern recognition and in the unsupervised learning of structure in data, and it may facilitate the management and transmission of big data. There is potential, via information compression, for substantial gains in computational efficiency, especially in the use of energy. The SP system may help to realise data-centric computing, perhaps via a development of Hebb's concept of a "cell assembly", or via the use of light or DNA for the processing of information. It has potential in the management of errors and uncertainty in data, in medical diagnosis, in processing streams of data, and in promoting adaptability in robots.
[ { "created": "Wed, 8 Jan 2014 11:32:56 GMT", "version": "v1" } ]
2014-02-20
[ [ "Wolff", "J. Gerard", "" ] ]
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1401.1671
S.M. Zafaruddin
Oshri Naparstek, S. M. Zafaruddin, Amir Leshem, Eduard Jorswieck
Distributed Energy Efficient Channel Allocation
12 pages, 7 figures, 3 Tables. This work has been submitted to the IEEE for possible publication
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null
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cs.NI cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Design of energy efficient protocols for modern wireless systems has become an important area of research. In this paper, we propose a distributed optimization algorithm for the channel assignment problem for multiple interfering transceiver pairs that cannot communicate with each other. We first modify the auction algorithm for maximal energy efficiency and show that the problem can be solved without explicit message passing using the carrier sense multiple access (CSMA) protocols. We then develop a novel scheme by converting the channel assignment problem into perfect matchings on bipartite graphs. The proposed scheme improves the energy efficiency and does not require any explicit message passing or a shared memory between the users. We derive bounds on the convergence rate and show that the proposed algorithm converges faster than the distributed auction algorithm and achieves near-optimal performance under Rayleigh fading channels. We also present an asymptotic performance analysis of the fast matching algorithm for energy efficient resource allocation and prove the optimality for large enough number of users and number of channels. Finally, we provide numerical assessments that confirm the energy efficiency gains compared to the state of the art.
[ { "created": "Wed, 8 Jan 2014 11:38:48 GMT", "version": "v1" }, { "created": "Thu, 15 Feb 2018 11:50:39 GMT", "version": "v2" } ]
2018-02-16
[ [ "Naparstek", "Oshri", "" ], [ "Zafaruddin", "S. M.", "" ], [ "Leshem", "Amir", "" ], [ "Jorswieck", "Eduard", "" ] ]
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1401.1676
Bengt Eliasson
Bengt Eliasson
Ion shock acceleration by large amplitude double layers in laser-produced plasmas
9 pages, 4 figures
Physics of Plasmas 21, 023111 (2014)
10.1063/1.4866240
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A kinetic model for the shock acceleration of ions in laser-produced plasmas is developed. A fraction of the warm ions are accelerated by the large amplitude monotonic potential of the double layer created due the plasma compression and electron heating by the laser. It is found that the amplitude of the large amplitude double layer is almost uniquely defined by the electron temperature. Therefore, a balance between electron heating and plasma compression is needed for optimal ion acceleration by this scheme. Typical Mach numbers of the monotonic shocks are close to 1.5. The scheme could potentially produce monoenergetic ions with a relative energy spread of less than 1 percent. The model is compared with recent simulations and experiments, where efficient shocks acceleration and production of monoenergetic protons have been observed. Similarities and differences with other shock models are pointed out and discussed.
[ { "created": "Wed, 8 Jan 2014 12:07:01 GMT", "version": "v1" }, { "created": "Wed, 5 Feb 2014 14:34:32 GMT", "version": "v2" }, { "created": "Fri, 21 Feb 2014 17:09:08 GMT", "version": "v3" } ]
2014-02-24
[ [ "Eliasson", "Bengt", "" ] ]
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1401.1677
Younes Ra'di
Y. Ra'di, V. S. Asadchy, and S. A. Tretyakov
Tailoring reflections from thin composite metamirrors
11 pages, 7 figures
null
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose an effective route to fully control the phase of plane waves reflected from electrically (optically) thin sheets. This becomes possible using engineered artificial full-reflection layers (metamirrors) as arrays of electrically small resonant bi-anisotropic particles. In this scenario, fully reflecting mirrors do not contain any continuous ground plane, but only arrays of small particles. Bi-anisotropic omega coupling is required to get asymmetric response in reflection phase for plane waves incident from the opposite sides of the composite mirror. It is shown that with this concept one can independently tailor the phase of electromagnetic waves reflected from both sides of the mirror array.
[ { "created": "Wed, 8 Jan 2014 12:13:35 GMT", "version": "v1" } ]
2014-01-09
[ [ "Ra'di", "Y.", "" ], [ "Asadchy", "V. S.", "" ], [ "Tretyakov", "S. A.", "" ] ]
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null
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1401.1679
Guillaume Jeanmairet
Guillaume Jeanmairet, Nicolas Levy, Maximilien Levesque and Daniel Borgis
Introduction to Classical Density Functional Theory by a Computational Experiment
4 pages, 2 figures, submitted to: The Journal of Chemical Education
null
10.1021/ed500049m
null
physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose an in-silico experiment to introduce classical density functional theory (cDFT). Den- sity functional theories, whether quantum or classical, rely on abstract concepts that are non- intuitive. However, they are at the heart of powerful tools and active fields of research in both physics and chemistry. They led to the 1998 Nobel Prize in chemistry. DFT is illustrated here in its most simple and yet physically relevant form: the classical density functional theory of an ideal fluid of classical particles. For illustration purpose, it is applied to the prediction of the molecular structure of liquid neon. The numerical experiment proposed therein is built around the writing of a cDFT code by students in Mathematica. Students thus have to deal with (i) the cDFT theory, (ii) some basic concepts of statistical mechanics of simple fluids, (iii) functional minimization, and (iv) a useful functional programming language. This computational experiment is proposed during a molecular simulation class, but may also be of interest in a quantum chemistry class to illustrate electronic DFT, if one highlights the analogies between the quantum and classical DFTs.
[ { "created": "Wed, 8 Jan 2014 12:24:36 GMT", "version": "v1" }, { "created": "Mon, 13 Jan 2014 10:47:58 GMT", "version": "v2" }, { "created": "Tue, 19 Aug 2014 14:42:03 GMT", "version": "v3" } ]
2014-10-16
[ [ "Jeanmairet", "Guillaume", "" ], [ "Levy", "Nicolas", "" ], [ "Levesque", "Maximilien", "" ], [ "Borgis", "Daniel", "" ] ]
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1401.1682
Simen A Adnoy Ellingsen
Simen {\AA}. Ellingsen
Ship waves in the presence of uniform vorticity
10 pages, 6 figures, accepted for J. Fluid Mech. Rapids
J. Fluid Mech. (JFM Rapids) 742 R2 (2014)
10.1017/jfm.2014.28
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Lord Kelvin's result that waves behind a ship lie within a half-angle 19 deg 28' is perhaps the most famous and striking result in the field of surface waves. We solve the linear ship wave problem in the presence of a shear current of constant vorticity S, and show that the Kelvin angles (one each side of wake) as well as other aspects of the wake depend closely on the "shear Froude number" Frs=VS/g (based on length g/S^2 and the ship's speed V), and on the angle between current and the ship's line of motion. In all directions except exactly along the shear flow there exists a critical value of Frs beyond which no transverse waves are produced, and where the full wake angle reaches 180 deg. Such critical behaviour is previously known from waves at finite depth. For side-on shear, one Kelvin angle can exceed 90 deg. On the other hand, the angle of maximum wave amplitude scales as 1/Fr (Fr based on size of ship) when Fr >> 1, a scaling virtually unaffected by the shear flow.
[ { "created": "Wed, 8 Jan 2014 12:38:09 GMT", "version": "v1" } ]
2014-02-26
[ [ "Ellingsen", "Simen Å.", "" ] ]
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1401.1684
Riccardo De Pascalis
Riccardo De Pascalis, I. David Abrahams, William J. Parnell
On nonlinear viscoelastic deformations - a reappraisal of Fung's quasilinear viscoelastic model
null
null
10.1098/rspa.2014.0058
null
physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This article offers a reappraisal of Fung's method for quasilinear viscoelasticity. It is shown that a number of negative features exhibited in other works, commonly attributed to the Fung approach, are merely a consequence of the way it has been applied. The approach outlined herein is shown to yield improved behaviour, and offers a straightforward scheme for solving a wide range of models. Results from the new model are contrasted with those in the literature for the case of uniaxial elongation of a bar: for an imposed stretch of an incompressible bar, and for an imposed load. In the last case, a numerical solution to a Volterra integral equation is required to obtain the results. This is achieved by a high order discretisation scheme. Finally, the stretch of a compressible viscoelastic bar is determined for two distinct materials: Horgan-Murphy and Gent.
[ { "created": "Wed, 8 Jan 2014 12:51:31 GMT", "version": "v1" } ]
2015-06-18
[ [ "De Pascalis", "Riccardo", "" ], [ "Abrahams", "I. David", "" ], [ "Parnell", "William J.", "" ] ]
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1401.1686
Tobias Kretz
Tobias Kretz, Karsten Lehmann, Ingmar Hofs\"a{\ss}
Pedestrian Route Choice by Iterated Equilibrium Search
contribution to proceedings of Traffic and Granular Flow 2013 (TGF13)
null
null
null
cs.MA cs.CE nlin.AO physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In vehicular traffic planning it is a long standing problem how to assign demand such on the available model of a road network that an equilibrium with regard to travel time or generalized costs is realized. For pedestrian traffic this question can be asked as well. However, as the infrastructure of pedestrian dynamics is not a network (a graph), but two-dimensional, there is in principle an infinitely large set of routes. As a consequence none of the iterating assignment methods developed for road traffic can be applied for pedestrians. In this contribution a method to overcome this problem is briefly summarized and applied with an example geometry which as a result is enhanced with routes with intermediate destination areas of certain shape. The enhanced geometry is used in some exemplary assignment calculations.
[ { "created": "Wed, 8 Jan 2014 13:01:55 GMT", "version": "v1" } ]
2014-01-09
[ [ "Kretz", "Tobias", "" ], [ "Lehmann", "Karsten", "" ], [ "Hofsäß", "Ingmar", "" ] ]
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1401.1687
Valery Shchesnovich
S. C. Fern\'andez and V. S. Shchesnovich
Nondecaying linear and nonlinear modes in a periodic array of spatially localized dissipations
20 pages, 11 figures (best viewed in color). Accepted to Journal of Physics A: Mathematical and Theoretical
null
10.1088/1751-8113/47/8/085202
null
math-ph math.MP nlin.PS physics.optics quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate the existence of extremely weakly decaying linear and nonlinear modes (i.e. modes immune to dissipation) in the one-dimensional periodic array of identical spatially localized dissipations, where the dissipation width is much smaller than the period of the array. We consider wave propagation governed by the one-dimensional Schr\"odinger equation in the array of identical Gaussian-shaped dissipations with three parameters, the integral dissipation strength $\Gamma_0$, the width $\sigma$ and the array period $d$. In the linear case, setting $\sigma\to0$, while keeping $\Gamma_0$ fixed, we get an array of zero-width dissipations given by the Dirac delta-functions, i.e. the complex Kroning-Penney model, where an infinite number of nondecaying modes appear with the Bloch index being either at the center, $k= 0$, or at the boundary, $k= \pi/d $, of an analog of the Brillouin zone. By using numerical simulations we confirm that the weakly decaying modes persist for $\sigma$ such that $\sigma/d\ll1$ and have the same Bloch index. The nondecaying modes persist also if a real-valued periodic potential is added to the spatially periodic array of dissipations, with the period of the dissipative array being multiple of that of the periodic potential. We also consider evolution of the soliton-shaped pulses in the nonlinear Schr\"odinger equation with the spatially periodic dissipative lattice and find that when the pulse width is much larger than the lattice period and its wave number $k$ is either at the center, $k= 2\pi/d$, or at the boundary, $k= \pi/d $, a significant fraction of the pulse escapes the dissipation forming a stationary nonlinear mode with the soliton shaped envelope and the Fourier spectrum consisting of two peaks centered at $k $ and $-k$.
[ { "created": "Wed, 8 Jan 2014 13:02:02 GMT", "version": "v1" } ]
2014-03-05
[ [ "Fernández", "S. C.", "" ], [ "Shchesnovich", "V. S.", "" ] ]
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1401.1690
Sergey Andreyev
Sergey Andreyev
Tendencies, Dead-ends, and Promising Ways. From Interface Ideas to New Programs
5 pages
null
null
null
cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The mechanism of communication between users and devices is called interface. From time to time changes in interface significantly improve our work with computers even without any serious changes in programs themselves. Main ideas in PCs interface were introduced many years ago and since then there are no significant changes, while new devices show promising ways by using direct manipulation of screen objects. Users' direct action with all the screen objects of our ordinary PCs turns standard screens into touch screens of very high resolution and not only changes the interface of familiar programs but creates the new type of programs: user-driven applications.
[ { "created": "Wed, 8 Jan 2014 13:22:42 GMT", "version": "v1" } ]
2014-01-09
[ [ "Andreyev", "Sergey", "" ] ]
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1401.1691
Jordi Gomis-Bresco Dr
J. Gomis-Bresco, D. Navarro-Urrios, M. Oudich, S. El-Jallal, A. Griol, D. Puerto, E. Chavez, Y. Pennec, B. Djafari-Rouhani, F. Alzina, A. Mart\'inez and C. M. Sotomayor Torres
A 1D Optomechanical crystal with a complete phononic band gap
9 pages, 4 figures
Nature Communications, 5, 4452 (2014)
10.1038/ncomms5452
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent years have witnessed the boom of cavity optomechanics, which exploits the confinement and coupling of optical and mechanical waves at the nanoscale. Amongst their physical implementations, optomechanical (OM) crystals built on semiconductor slabs enable the integration and manipulation of multiple OM elements in a single chip and provide GHz phonons suitable for coherent phonon manipulation. Different demonstrations of coupling of infrared photons and GHz phonons in cavities created by inserting defects on OM crystals have been performed. However, the considered structures do not show a complete phononic bandgap, which should allow longer dephasing time, since acoustic leakage is minimized. We demonstrate the excitation of acoustic modes in a 1D OM crystal properly designed to display a full phononic bandgap for acoustic modes at 4 GHz. The modes inside the complete bandgap are designed to have mechanical Q factors above 10e8 and invariant to fabrication imperfections.
[ { "created": "Wed, 8 Jan 2014 13:25:39 GMT", "version": "v1" }, { "created": "Fri, 17 Jan 2014 16:06:24 GMT", "version": "v2" } ]
2014-07-29
[ [ "Gomis-Bresco", "J.", "" ], [ "Navarro-Urrios", "D.", "" ], [ "Oudich", "M.", "" ], [ "El-Jallal", "S.", "" ], [ "Griol", "A.", "" ], [ "Puerto", "D.", "" ], [ "Chavez", "E.", "" ], [ "Pennec", "Y.", "" ], [ "Djafari-Rouhani", "B.", "" ], [ "Alzina", "F.", "" ], [ "Martínez", "A.", "" ], [ "Torres", "C. M. Sotomayor", "" ] ]
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1401.1693
Harald Ruess
Martin Hofmann, Harald Ruess
Certification for mu-calculus with winning strategies
Presented at the VeriSure workshop associated with CAV'13 in St. Petersburg in July 2013
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We define memory-efficient certificates for $\mu$-calculus model checking problems based on the well-known correspondence of the $\mu$-calculus model checking with winning certain parity games. Winning strategies can independently checked, in low polynomial time, by observing that there is no reachable strongly connected component in the graph of the parity game whose largest priority is odd. Winning strategies are computed by fixpoint iteration following the naive semantics of $\mu$-calculus. We instrument the usual fixpoint iteration of $\mu$-calculus model checking so that it produces evidence in the form of a winning strategy; these winning strategies can be computed in polynomial time in $|S|$ and in space $O(|S|^2 |{\phi}|^2)$, where $|S|$ is the size of the state space and $|\phi|$ the length of the formula $\phi$\@. The main technical contribution here is the notion and algebra of partial winning strategies. On the technical level our work can be seen as a new, simpler, and immediate constructive proof of the correspondence between $\mu$-calculus and parity games.
[ { "created": "Wed, 8 Jan 2014 13:30:54 GMT", "version": "v1" } ]
2014-01-09
[ [ "Hofmann", "Martin", "" ], [ "Ruess", "Harald", "" ] ]
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1401.1696
Thomas T\"ows
Sebastian Getfert, Thomas T\"ows and Peter Reimann
Reluctance of a neutral nanoparticle to enter a charged pore
null
Physical Review E 88, 052710 (2013)
10.1103/PhysRevE.88.052710
null
cond-mat.soft physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the translocation of a neutral (uncharged) nanoparticle through a pore in a thin membrane with constant surface charge density. If the concomitant Debye screening layer is sufficiently thin, the resulting forces experienced by the particle on its way through the pore are negligible. But when the Debye length becomes comparable to the pore diameter, the particle encounters a quite significant potential barrier while approaching and entering the pore, and symmetrically upon exiting the pore. The main reason is an increasing pressure which acts on the particle when it intrudes into the counter ion cloud of the Debye screening layer. In case the polarizability of the particle is different (usually smaller) than that of the ambient fluid, a second, much smaller contribution to the potential barrier is due to self-energy effects. Our numerical treatment of the problem is complemented by analytical approximations for sufficiently long cylindrical particles and pores, which agree very well with the numerics.
[ { "created": "Wed, 8 Jan 2014 13:35:33 GMT", "version": "v1" } ]
2014-01-09
[ [ "Getfert", "Sebastian", "" ], [ "Töws", "Thomas", "" ], [ "Reimann", "Peter", "" ] ]
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1401.1699
Stefan Willitsch
Stefan Willitsch
Ion-atom hybrid systems
To appear in the Proceedings of the International School of Physics Enrico Fermi, Course 189: Ion Traps for Tomorrows Applications
null
null
null
physics.atom-ph physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The study of interactions between simultaneously trapped cold ions and atoms has emerged as a new research direction in recent years. The development of ion-atom hybrid experiments has paved the way for investigating elastic, inelastic and reactive collisions between these species at very low temperatures, for exploring new cooling mechanisms of ions by atoms and for implementing new hybrid quantum systems. The present lecture reviews experimental methods, recent results and upcoming developments in this emerging field.
[ { "created": "Wed, 8 Jan 2014 13:43:34 GMT", "version": "v1" } ]
2014-01-09
[ [ "Willitsch", "Stefan", "" ] ]
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1401.1702
Gerd Kortemeyer
Gerd Kortemeyer
Extending Item Response Theory to Online Homework
null
Physical Review SPECIAL TOPICS - PHYSICS EDUCATION RESEARCH 10, 010118 (2014)
10.1103/PhysRevSTPER.10.010118
null
physics.ed-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Item Response Theory becomes an increasingly important tool when analyzing ``Big Data'' gathered from online educational venues. However, the mechanism was originally developed in traditional exam settings, and several of its assumptions are infringed upon when deployed in the online realm. For a large enrollment physics course for scientists and engineers, the study compares outcomes from IRT analyses of exam and homework data, and then proceeds to investigate the effects of each confounding factor introduced in the online realm. It is found that IRT yields the correct trends for learner ability and meaningful item parameters, yet overall agreement with exam data is moderate. It is also found that learner ability and item discrimination is over wide ranges robust with respect to model assumptions and introduced noise, less so than item difficulty.
[ { "created": "Wed, 8 Jan 2014 13:57:24 GMT", "version": "v1" } ]
2014-05-29
[ [ "Kortemeyer", "Gerd", "" ] ]
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1401.1711
Ritesh Kolte
Ritesh Kolte, Urs Niesen and Piyush Gupta
Energy-Efficient Communication over the Unsynchronized Gaussian Diamond Network
20 pages, 4 figures, submitted to IEEE Transactions on Information Theory, presented at IEEE ISIT 2014
IEEE Transactions on Information Theory, vol. 60, pp. 7719 - 7731, December 2014
10.1109/TIT.2014.2364028
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Communication networks are often designed and analyzed assuming tight synchronization among nodes. However, in applications that require communication in the energy-efficient regime of low signal-to-noise ratios, establishing tight synchronization among nodes in the network can result in a significant energy overhead. Motivated by a recent result showing that near-optimal energy efficiency can be achieved over the AWGN channel without requiring tight synchronization, we consider the question of whether the potential gains of cooperative communication can be achieved in the absence of synchronization. We focus on the symmetric Gaussian diamond network and establish that cooperative-communication gains are indeed feasible even with unsynchronized nodes. More precisely, we show that the capacity per unit energy of the unsynchronized symmetric Gaussian diamond network is within a constant factor of the capacity per unit energy of the corresponding synchronized network. To this end, we propose a distributed relaying scheme that does not require tight synchronization but nevertheless achieves most of the energy gains of coherent combining.
[ { "created": "Wed, 8 Jan 2014 14:48:00 GMT", "version": "v1" }, { "created": "Thu, 9 Jan 2014 01:58:33 GMT", "version": "v2" }, { "created": "Tue, 8 Jul 2014 01:41:59 GMT", "version": "v3" } ]
2016-11-18
[ [ "Kolte", "Ritesh", "" ], [ "Niesen", "Urs", "" ], [ "Gupta", "Piyush", "" ] ]
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1401.1714
Cedomir Stefanovic
Cedomir Stefanovic, Miyu Momoda, Petar Popovski
Exploiting Capture Effect in Frameless ALOHA for Massive Wireless Random Access
Accepted for presentation at IEEE WCNC'14 Track 2 (MAC and Cross-Layer Design)
null
10.1109/WCNC.2014.6952516
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The analogies between successive interference cancellation (SIC) in slotted ALOHA framework and iterative belief-propagation erasure-decoding, established recently, enabled the application of the erasure-coding theory and tools to design random access schemes. This approach leads to throughput substantially higher than the one offered by the traditional slotted ALOHA. In the simplest setting, SIC progresses when a successful decoding occurs for a single user transmission. In this paper we consider a more general setting of a channel with capture and explore how such physical model affects the design of the coded random access protocol. Specifically, we assess the impact of capture effect in Rayleigh fading scenario on the design of SIC-enabled slotted ALOHA schemes. We provide analytical treatment of frameless ALOHA, which is a special case of SIC-enabled ALOHA scheme. We demonstrate both through analytical and simulation results that the capture effect can be very beneficial in terms of achieved throughput.
[ { "created": "Wed, 8 Jan 2014 14:52:16 GMT", "version": "v1" } ]
2016-11-17
[ [ "Stefanovic", "Cedomir", "" ], [ "Momoda", "Miyu", "" ], [ "Popovski", "Petar", "" ] ]
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1401.1720
Panayiotis Frangos V
Ch. Christakis, K. Ioannidi, S.Sautbekov, P. Frangos and S.K. Atanov
The radiation problem from a vertical short dipole antenna above flat and lossy ground. Novel formulation in the spectral domain with closed form analytical solution in the high frequency regime
null
null
null
null
physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we consider the problem of radiation from a vertical short Hertzian dipole above flat lossy ground, which represents the well known in the literature Sommerfeld radiation problem. The problem is formulated in a novel spectral domain approach, and by inverse three dimensional Fourier transformation the expressions for the received electric and magnetic field in the physical space are derived as one dimensional integrals over the radial component of wavevector, in cylindrical coordinates. Subsequent use of the Stationary Phase Method in the high frequency regime yields closed form analytical solutions for the received EM field vectors, which coincide with the corresponding reflected EM field originating from the image point. In this way, we conclude that the so called in the literature space wave, i.e. line of sight plus reflected EM field, represents the total solution of the Sommerfeld problem in the high frequency regime, in which case the surface wave can be ignored. Finally, numerical results in the high frequency regime are presented in this paper, in comparison with corresponding numerical results based on Norton solution of the problem, i.e. space and surface waves.
[ { "created": "Wed, 8 Jan 2014 15:10:14 GMT", "version": "v1" } ]
2014-01-09
[ [ "Christakis", "Ch.", "" ], [ "Ioannidi", "K.", "" ], [ "Sautbekov", "S.", "" ], [ "Frangos", "P.", "" ], [ "Atanov", "S. K.", "" ] ]
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1401.1723
Helga Gudmundsdottir
Helga Gudmundsdottir, Eyj\'olfur I \'Asgeirsson, Marijke H. L. Bodlaender, Joseph T. Foley, Magn\'us M. Halld\'orsson, Ymir Vigfusson
Wireless Scheduling Algorithms in Complex Environments
null
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Efficient spectrum use in wireless sensor networks through spatial reuse requires effective models of packet reception at the physical layer in the presence of interference. Despite recent progress in analytic and simulations research into worst-case behavior from interference effects, these efforts generally assume geometric path loss and isotropic transmission, assumptions which have not been borne out in experiments. Our paper aims to provide a methodology for grounding theoretical results into wireless interference in experimental reality. We develop a new framework for wireless algorithms in which distance-based path loss is replaced by an arbitrary gain matrix, typically obtained by measurements of received signal strength (RSS). Gain matrices allow for the modeling of complex environments, e.g., with obstacles and walls. We experimentally evaluate the framework in two indoors testbeds with 20 and 60 motes, and confirm superior predictive performance in packet reception rate for a gain matrix model over a geometric distance-based model. At the heart of our approach is a new parameter $\zeta$ called metricity which indicates how close the gain matrix is to a distance metric, effectively measuring the complexity of the environment. A powerful theoretical feature of this parameter is that all known SINR scheduling algorithms that work in general metric spaces carry over to arbitrary gain matrices and achieve equivalent performance guarantees in terms of $\zeta$ as previously obtained in terms of the path loss constant. Our experiments confirm the sensitivity of $\zeta$ to the nature of the environment. Finally, we show analytically and empirically how multiple channels can be leveraged to improve metricity and thereby performance. We believe our contributions will facilitate experimental validation for recent advances in algorithms for physical wireless interference models.
[ { "created": "Wed, 8 Jan 2014 15:14:34 GMT", "version": "v1" }, { "created": "Fri, 16 May 2014 17:19:12 GMT", "version": "v2" } ]
2014-05-19
[ [ "Gudmundsdottir", "Helga", "" ], [ "Ásgeirsson", "Eyjólfur I", "" ], [ "Bodlaender", "Marijke H. L.", "" ], [ "Foley", "Joseph T.", "" ], [ "Halldórsson", "Magnús M.", "" ], [ "Vigfusson", "Ymir", "" ] ]
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1401.1724
Tomoya Iju
T. Iju, M. Tokumaru, K. Fujiki
Kinematic Properties of Slow ICMEs and an Interpretation of a Modified Drag Equation for Fast and Moderate ICMEs
24 pages, 6 figures, 10 tables, accepted for publication in Solar Physics
Solar Phys. 289 (2014) 2157--2175
10.1007/s11207-014-0472-3
null
physics.space-ph astro-ph.SR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report kinematic properties of slow interplanetary coronal mass ejections (ICMEs) identified by SOHO/LASCO, interplanetary scintillation, and in-situ observations, and propose a modified equation for the ICME motion. We identify seven ICMEs between 2010 and 2011, and examine them with 39 events reported in our previous work. We examine 15 fast (V_SOHO - V_bg > 500 km/s), 25 moderate (0 km/s <= V_SOHO - V_bg <= 500 km/s), and 6 slow (V_SOHO - V_bg < 0 km/s) ICMEs, where V_SOHO and V_bg are the initial speed of ICMEs and the speed of the background solar wind, respectively. For slow ICMEs, we found the following results: i) They accelerate toward the speed of the background solar wind during their propagation, and reach their final speed by 0.34 (+-) 0.03 AU. ii) The acceleration ends when they reach 479 (+-) 126 km/s; this is close to the typical speed of the solar wind during the period of this study. iii) When k_1 and k_2 are assumed to be constants, a quadratic equation for the acceleration a = -k_2(V - V_bg)|V - V_bg| is more appropriate than a linear one a = -k_1(V - V_bg), where V is the propagation speed of ICMEs, while the latter gives a smaller chi-square value than the former. For the motion of the fast and moderate ICMEs, we found a modified drag equation. From the viewpoint of fluid dynamics, we interpret this equation as indicating that ICMEs with 0 km/s <= V - V_bg <= 2300 km/s are controlled mainly by the hydrodynamic Stokes drag force, while the aerodynamic drag force is a predominant factor for the propagation of ICME with V - V_bg > 2300 km/s.
[ { "created": "Wed, 8 Jan 2014 15:22:40 GMT", "version": "v1" } ]
2014-10-08
[ [ "Iju", "T.", "" ], [ "Tokumaru", "M.", "" ], [ "Fujiki", "K.", "" ] ]
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1401.1732
Alessandro Sordoni
Alessandro Sordoni and Jian-Yun Nie
Looking at Vector Space and Language Models for IR using Density Matrices
In Proceedings of Quantum Interaction 2013
null
null
null
cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work, we conduct a joint analysis of both Vector Space and Language Models for IR using the mathematical framework of Quantum Theory. We shed light on how both models allocate the space of density matrices. A density matrix is shown to be a general representational tool capable of leveraging capabilities of both VSM and LM representations thus paving the way for a new generation of retrieval models. We analyze the possible implications suggested by our findings.
[ { "created": "Wed, 8 Jan 2014 15:46:35 GMT", "version": "v1" } ]
2014-01-09
[ [ "Sordoni", "Alessandro", "" ], [ "Nie", "Jian-Yun", "" ] ]
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1401.1736
Emanuel A. Lazar
Emanuel A. Lazar, Jeremy K. Mason, Robert D. MacPherson, David J. Srolovitz
Statistical Topology of Three-Dimensional Poisson-Voronoi Cells and Cell Boundary Networks
15 pages, 19 figures, Supplemental Material included
Phys. Rev. E 88, 063309 (2013)
10.1103/PhysRevE.88.063309
null
physics.comp-ph cond-mat.dis-nn cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Voronoi tessellations of Poisson point processes are widely used for modeling many types of physical and biological systems. In this paper, we analyze simulated Poisson-Voronoi structures containing a total of 250,000,000 cells to provide topological and geometrical statistics of this important class of networks. We also report correlations between some of these topological and geometrical measures. Using these results, we are able to corroborate several conjectures regarding the properties of three-dimensional Poisson-Voronoi networks and refute others. In many cases, we provide accurate fits to these data to aid further analysis. We also demonstrate that topological measures represent powerful tools for describing cellular networks and for distinguishing among different types of networks.
[ { "created": "Wed, 8 Jan 2014 16:05:50 GMT", "version": "v1" } ]
2014-01-09
[ [ "Lazar", "Emanuel A.", "" ], [ "Mason", "Jeremy K.", "" ], [ "MacPherson", "Robert D.", "" ], [ "Srolovitz", "David J.", "" ] ]
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1401.1742
Avinash Bhute
Avinash N Bhute, B. B. Meshram
Content Based Image Indexing and Retrieval
12 pages
IJGIP 2013 Vol 3 issue 4
null
null
cs.CV cs.GR cs.IR cs.MM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we present the efficient content based image retrieval systems which employ the color, texture and shape information of images to facilitate the retrieval process. For efficient feature extraction, we extract the color, texture and shape feature of images automatically using edge detection which is widely used in signal processing and image compression. For facilitated the speedy retrieval we are implements the antipole-tree algorithm for indexing the images.
[ { "created": "Wed, 8 Jan 2014 16:22:09 GMT", "version": "v1" } ]
2014-01-09
[ [ "Bhute", "Avinash N", "" ], [ "Meshram", "B. B.", "" ] ]
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1401.1752
Noreen Jamil
Noreen Jamil, Johannes M\"uller, Christof Lutteroth and Gerald Weber
Speeding up SOR Solvers for Constraint-based GUIs with a Warm-Start Strategy
null
null
null
null
cs.HC cs.AI cs.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Many computer programs have graphical user interfaces (GUIs), which need good layout to make efficient use of the available screen real estate. Most GUIs do not have a fixed layout, but are resizable and able to adapt themselves. Constraints are a powerful tool for specifying adaptable GUI layouts: they are used to specify a layout in a general form, and a constraint solver is used to find a satisfying concrete layout, e.g.\ for a specific GUI size. The constraint solver has to calculate a new layout every time a GUI is resized or changed, so it needs to be efficient to ensure a good user experience. One approach for constraint solvers is based on the Gauss-Seidel algorithm and successive over-relaxation (SOR). Our observation is that a solution after resizing or changing is similar in structure to a previous solution. Thus, our hypothesis is that we can increase the computational performance of an SOR-based constraint solver if we reuse the solution of a previous layout to warm-start the solving of a new layout. In this paper we report on experiments to test this hypothesis experimentally for three common use cases: big-step resizing, small-step resizing and constraint change. In our experiments, we measured the solving time for randomly generated GUI layout specifications of various sizes. For all three cases we found that the performance is improved if an existing solution is used as a starting solution for a new layout.
[ { "created": "Mon, 6 Jan 2014 10:29:32 GMT", "version": "v1" } ]
2014-01-09
[ [ "Jamil", "Noreen", "" ], [ "Müller", "Johannes", "" ], [ "Lutteroth", "Christof", "" ], [ "Weber", "Gerald", "" ] ]
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1401.1753
Sounak Sadhukhan
Sounak Sadhukhan, Samar Sen Sarma
A Solution of Degree Constrained Spanning Tree Using Hybrid GA
This paper has been withdrawn by the author due to some crucial errors
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cs.NE cs.DS
http://creativecommons.org/licenses/by/3.0/
In real life, it is always an urge to reach our goal in minimum effort i.e., it should have a minimum constrained path. The path may be shortest route in practical life, either physical or electronic medium. The scenario is to represents the ambiance as a graph and to find a spanning tree with custom design criteria. Here, we have chosen a minimum degree spanning tree, which can be generated in real time with minimum turnaround time. The problem is NP-complete in nature [1, 2]. The solution approach, in general, is approximate. We have used a heuristic approach, namely hybrid genetic algorithm (GA), with motivated criteria of encoded data structures of graph. We compare the experimental result with the existing approximate algorithm and the result is so encouraging that we are interested to use it in our future applications.
[ { "created": "Wed, 8 Jan 2014 17:05:41 GMT", "version": "v1" }, { "created": "Mon, 13 Jan 2014 17:04:59 GMT", "version": "v2" } ]
2014-01-14
[ [ "Sadhukhan", "Sounak", "" ], [ "Sarma", "Samar Sen", "" ] ]
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1401.1757
Mark Bull
Mark Tucker and J. Mark Bull
An efficient algorithm for the calculation of reserves for non-unit linked life policies
28 pages
null
null
null
q-fin.CP cs.CE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The underlying stochastic nature of the requirements for the Solvency II regulations has introduced significant challenges if the required calculations are to be performed correctly, without resorting to excessive approximations, within practical timescales. It is generally acknowledged by practising actuaries within UK life offices that it is currently impossible to correctly fulfil the requirements imposed by Solvency II using existing computational techniques based on commercially available valuation packages. Our work has already shown that it is possible to perform profitability calculations at a far higher rate than is achievable using commercial packages. One of the key factors in achieving these gains is to calculate reserves using recurrence relations that scale linearly with the number of time steps. Here, we present a general vector recurrence relation which can be used for a wide range of non-unit linked policies that are covered by Solvency II; such contracts include annuities, term assurances, and endowments. Our results suggest that by using an optimised parallel implementation of this algorithm, on an affordable hardware platform, it is possible to perform the `brute force' approach to demonstrating solvency in a realistic timescale (of the order of a few hours).
[ { "created": "Wed, 8 Jan 2014 17:16:29 GMT", "version": "v1" }, { "created": "Fri, 27 Jun 2014 15:23:30 GMT", "version": "v2" } ]
2014-06-30
[ [ "Tucker", "Mark", "" ], [ "Bull", "J. Mark", "" ] ]
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1401.1760
Abhinav Sinha
Abhinav Sinha and Achilleas Anastasopoulos
Generalized Proportional Allocation Mechanism Design for Unicast Service on the Internet
arXiv admin note: text overlap with arXiv:1307.2569
null
null
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this report we construct two mechanisms that fully implement social welfare maximising allocation in Nash equilibria for the case of a single infinitely divisible good subject to multiple inequality constraints. The first mechanism achieves weak budget balance, while the second is an extension of the first, and achieves strong budget balance. One important application of this mechanism is unicast service on the Internet where a network operator wishes to allocate rates among strategic users in such a way that maximise overall user satisfaction while respecting capacity constraints on every link in the network. The emphasis of this work is on full implementation, which means that all Nash equilibria of the induced game result in the optimal allocations of the centralized allocation problem.
[ { "created": "Wed, 8 Jan 2014 17:39:21 GMT", "version": "v1" }, { "created": "Mon, 13 Jan 2014 16:24:47 GMT", "version": "v2" }, { "created": "Mon, 3 Feb 2014 05:35:09 GMT", "version": "v3" } ]
2014-02-06
[ [ "Sinha", "Abhinav", "" ], [ "Anastasopoulos", "Achilleas", "" ] ]
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1401.1761
Grzegorz Pawlik
G. Pawlik, K. Tarnowski, W. Walasik, A.C. Mitus, I.C. Khoo
Liquid crystal hyperbolic metamaterial for wide-angle negative-positive refraction and reflection
null
null
10.1364/OL.39.001744
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that nanosphere dispersed liquid crystal (NDLC) metamaterial can be characterized in near IR spectral region as an indefinite medium whose real parts of effective ordinary and extraordinary permittivities are opposite in signs. Based on this fact we design a novel electrooptic effect: external electric field driven switch between normal refraction, negative refraction and reflection of TM incident electromagnetic wave from the boundary vacuum/NDLC. A detailed analysis of its functionality is given based on effective medium theory combined with a study of negative refraction in anisotropic metamaterials, and Finite Elements simulations.
[ { "created": "Wed, 8 Jan 2014 18:02:11 GMT", "version": "v1" } ]
2015-06-18
[ [ "Pawlik", "G.", "" ], [ "Tarnowski", "K.", "" ], [ "Walasik", "W.", "" ], [ "Mitus", "A. C.", "" ], [ "Khoo", "I. C.", "" ] ]
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1401.1762
William Hoover
Julien Clinton Sprott, William Graham Hoover, and Carol Griswold Hoover
Heat Conduction, and the Lack Thereof, in Time-Reversible Dynamical Systems: Generalized Nos\'e-Hoover Oscillators with a Temperature Gradient
Fifteen pages and six figures, incorporating two rounds of referees' suggestions for Physical Review E
null
10.1103/PhysRevE.89.042914
null
cond-mat.stat-mech nlin.CD physics.class-ph physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use nonequilibrium molecular dynamics to analyze and illustrate the qualitative differences between the one-thermostat and two-thermostat versions of equilibrium and nonequilibrium (heat-conducting) harmonic oscillators. Conservative nonconducting regions can coexist with dissipative heat conducting regions in phase space with exactly the same imposed temperature field.
[ { "created": "Wed, 8 Jan 2014 18:03:13 GMT", "version": "v1" }, { "created": "Sat, 18 Jan 2014 18:35:24 GMT", "version": "v2" }, { "created": "Wed, 26 Feb 2014 22:47:10 GMT", "version": "v3" }, { "created": "Sun, 13 Apr 2014 02:16:58 GMT", "version": "v4" } ]
2015-06-18
[ [ "Sprott", "Julien Clinton", "" ], [ "Hoover", "William Graham", "" ], [ "Hoover", "Carol Griswold", "" ] ]
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1401.1763
Vladimir Braverman
Vladimir Braverman, Jonathan Katzman, Charles Seidell, Gregory Vorsanger
Approximating Large Frequency Moments with $O(n^{1-2/k})$ Bits
null
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we consider the problem of approximating frequency moments in the streaming model. Given a stream $D = \{p_1,p_2,\dots,p_m\}$ of numbers from $\{1,\dots, n\}$, a frequency of $i$ is defined as $f_i = |\{j: p_j = i\}|$. The $k$-th \emph{frequency moment} of $D$ is defined as $F_k = \sum_{i=1}^n f_i^k$. In this paper we give an upper bound on the space required to find a $k$-th frequency moment of $O(n^{1-2/k})$ bits that matches, up to a constant factor, the lower bound of Woodruff and Zhang (STOC 12) for constant $\epsilon$ and constant $k$. Our algorithm makes a single pass over the stream and works for any constant $k > 3$.
[ { "created": "Wed, 8 Jan 2014 18:05:26 GMT", "version": "v1" }, { "created": "Mon, 27 Jan 2014 02:31:23 GMT", "version": "v2" } ]
2014-01-28
[ [ "Braverman", "Vladimir", "" ], [ "Katzman", "Jonathan", "" ], [ "Seidell", "Charles", "" ], [ "Vorsanger", "Gregory", "" ] ]
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1401.1766
Yuanyuan Zhang
James Z. Wang, Yuanyuan Zhang, Liang Dong, Lin Li, Pradip K Srimani, Philip S. Yu
G-Bean: an ontology-graph based web tool for biomedical literature retrieval
This paper has been withdrawn by the author due to errors in figure 1
null
null
null
cs.IR
http://creativecommons.org/licenses/by/3.0/
Currently, most people use PubMed to search the MEDLINE database, an important bibliographical information source for life science and biomedical information. However, PubMed has some drawbacks that make it difficult to find relevant publications pertaining to users' individual intentions, especially for non-expert users. To ameliorate the disadvantages of PubMed, we developed G-Bean, a graph based biomedical search engine, to search biomedical articles in MEDLINE database more efficiently.G-Bean addresses PubMed's limitations with three innovations: parallel document index creation,ontology-graph based query expansion, and retrieval and re-ranking of documents based on user's search intention.Performance evaluation with 106 OHSUMED benchmark queries shows that G-Bean returns more relevant results than PubMed does when using these queries to search the MEDLINE database. PubMed could not even return any search result for some OHSUMED queries because it failed to form the appropriate Boolean query statement automatically from the natural language query strings. G-Bean is available at http://bioinformatics.clemson.edu/G-Bean/index.php.G-Bean addresses PubMed's limitations with ontology-graph based query expansion, automatic document indexing, and user search intention discovery. It shows significant advantages in finding relevant articles from the MEDLINE database to meet the information need of the user.
[ { "created": "Wed, 8 Jan 2014 18:15:31 GMT", "version": "v1" }, { "created": "Wed, 22 Jan 2014 16:00:11 GMT", "version": "v2" }, { "created": "Mon, 27 Jan 2014 15:49:22 GMT", "version": "v3" }, { "created": "Fri, 28 Feb 2014 14:55:12 GMT", "version": "v4" }, { "created": "Mon, 31 Aug 2015 19:27:00 GMT", "version": "v5" } ]
2015-09-01
[ [ "Wang", "James Z.", "" ], [ "Zhang", "Yuanyuan", "" ], [ "Dong", "Liang", "" ], [ "Li", "Lin", "" ], [ "Srimani", "Pradip K", "" ], [ "Yu", "Philip S.", "" ] ]
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1401.1770
Mathieu Leconte
Mathieu Leconte, Marc Lelarge and Laurent Massouli\'e
Adaptive Replication in Distributed Content Delivery Networks
10 pages, 5 figures
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We address the problem of content replication in large distributed content delivery networks, composed of a data center assisted by many small servers with limited capabilities and located at the edge of the network. The objective is to optimize the placement of contents on the servers to offload as much as possible the data center. We model the system constituted by the small servers as a loss network, each loss corresponding to a request to the data center. Based on large system / storage behavior, we obtain an asymptotic formula for the optimal replication of contents and propose adaptive schemes related to those encountered in cache networks but reacting here to loss events, and faster algorithms generating virtual events at higher rate while keeping the same target replication. We show through simulations that our adaptive schemes outperform significantly standard replication strategies both in terms of loss rates and adaptation speed.
[ { "created": "Wed, 8 Jan 2014 18:29:13 GMT", "version": "v1" } ]
2014-01-09
[ [ "Leconte", "Mathieu", "" ], [ "Lelarge", "Marc", "" ], [ "Massoulié", "Laurent", "" ] ]
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1401.1771
Yang Xiang
Yang Xiang
Simple linear algorithms for mining graph cores
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null
null
null
cs.DS cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Batagelj and Zaversnik proposed a linear algorithm for the well-known $k$-core decomposition problem. However, when $k$-cores are desired for a given $k$, we find that a simple linear algorithm requiring no sorting works for mining $k$-cores. In addition, this algorithm can be extended to mine $(k_1, k_2,\ldots, k_p)$-cores from $p$-partite graphs in linear time, and this mining approach can be efficiently implemented in a distributed computing environment with a lower message complexity bound in comparison with the best known method of distributed $k$-core decomposition.
[ { "created": "Wed, 8 Jan 2014 18:34:38 GMT", "version": "v1" } ]
2014-01-09
[ [ "Xiang", "Yang", "" ] ]
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