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1401.4644
Cyril Voyant
Cyril Voyant (SPE), Pierrick Haurant (CETHIL), Marc Muselli (SPE), Christophe Paoli (SPE), Marie Laure Nivet (SPE)
Time series modeling and large scale global solar radiation forecasting from geostationary satellites data
Solar Energy (2014)
null
null
null
cs.CE physics.comp-ph stat.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
When a territory is poorly instrumented, geostationary satellites data can be useful to predict global solar radiation. In this paper, we use geostationary satellites data to generate 2-D time series of solar radiation for the next hour. The results presented in this paper relate to a particular territory, the Corsica Island, but as data used are available for the entire surface of the globe, our method can be easily exploited to another place. Indeed 2-D hourly time series are extracted from the HelioClim-3 surface solar irradiation database treated by the Heliosat-2 model. Each point of the map have been used as training data and inputs of artificial neural networks (ANN) and as inputs for two persistence models (scaled or not). Comparisons between these models and clear sky estimations were proceeded to evaluate the performances. We found a normalized root mean square error (nRMSE) close to 16.5% for the two best predictors (scaled persistence and ANN) equivalent to 35-45% related to ground measurements. Finally in order to validate our 2-D predictions maps, we introduce a new error metric called the gamma index which is a criterion for comparing data from two matrixes in medical physics. As first results, we found that in winter and spring, scaled persistence gives the best results (gamma index test passing rate is respectively 67.7% and 86%), in autumn simple persistence is the best predictor (95.3%) and ANN is the best in summer (99.8%).
[ { "created": "Sun, 19 Jan 2014 08:02:29 GMT", "version": "v1" } ]
2014-01-21
[ [ "Voyant", "Cyril", "", "SPE" ], [ "Haurant", "Pierrick", "", "CETHIL" ], [ "Muselli", "Marc", "", "SPE" ], [ "Paoli", "Christophe", "", "SPE" ], [ "Nivet", "Marie Laure", "", "SPE" ] ]
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1401.4648
Rafid Siddiqui
Rafid Siddiqui, Siamak Khatibi
Visual Tracking using Particle Swarm Optimization
null
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The problem of robust extraction of visual odometry from a sequence of images obtained by an eye in hand camera configuration is addressed. A novel approach toward solving planar template based tracking is proposed which performs a non-linear image alignment for successful retrieval of camera transformations. In order to obtain global optimum a bio-metaheuristic is used for optimization of similarity among the planar regions. The proposed method is validated on image sequences with real as well as synthetic transformations and found to be resilient to intensity variations. A comparative analysis of the various similarity measures as well as various state-of-art methods reveal that the algorithm succeeds in tracking the planar regions robustly and has good potential to be used in real applications.
[ { "created": "Sun, 19 Jan 2014 09:52:19 GMT", "version": "v1" } ]
2014-01-21
[ [ "Siddiqui", "Rafid", "" ], [ "Khatibi", "Siamak", "" ] ]
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1401.4650
Vincent Vajnovszki
Antonio Bernini, Stefano Bilotta, Renzo Pinzani, Vincent Vajnovszki
A Gray Code for cross-bifix-free sets
null
null
10.1017/S0960129515000067
null
cs.IT cs.DM math.CO math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A cross-bifix-free set of words is a set in which no prefix of any length of any word is the suffix of any other word in the set. A construction of cross-bifix-free sets has recently been proposed by Chee {\it et al.} in 2013 within a constant factor of optimality. We propose a \emph{trace partitioned} Gray code for these cross-bifix-free sets and a CAT algorithm generating it.
[ { "created": "Sun, 19 Jan 2014 10:07:55 GMT", "version": "v1" } ]
2015-05-20
[ [ "Bernini", "Antonio", "" ], [ "Bilotta", "Stefano", "" ], [ "Pinzani", "Renzo", "" ], [ "Vajnovszki", "Vincent", "" ] ]
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1401.4652
Lev Maslov
Lev A. Maslov
Self-organization in the Earth climate system versus Milankovitch-Berger astronomical cycles
This paper has been withdrawn by the author because of his disappointment in this work
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null
null
physics.ao-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Late Pleistocene Antarctic temperature variation curve is decomposed into two parts: cyclic and stochastic. These two parts represent different but tightly interconnected processes and also represent two different types of self-organization of the Earth climate system. The self-organization in the cyclic component is the non-linear auto-oscillation reaction of the Earth climate system, as a whole, to the input of solar radiation. The self-organization in the stochastic component is a nonlinear critical process, taking energy from, and fluctuating around the cyclic component of the temperature variations. The system of ODEs is written to model the cyclic part of the temperature variation, and the multifractal spectrum of the stochastic part of the temperature variation is calculated. The Earth climate can be characterized as an open, complex, self-organized dynamical system with nonlinear reaction to the input of solar radiation.
[ { "created": "Sun, 19 Jan 2014 10:31:27 GMT", "version": "v1" }, { "created": "Tue, 13 May 2014 10:32:34 GMT", "version": "v2" }, { "created": "Sat, 17 May 2014 12:53:37 GMT", "version": "v3" } ]
2014-05-20
[ [ "Maslov", "Lev A.", "" ] ]
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1401.4655
Karel De Vogeleer
Karel De Vogeleer, Gerard Memmi, Pierre Jouvelot, Fabien Coelho
The Energy/Frequency Convexity Rule: Modeling and Experimental Validation on Mobile Devices
null
null
null
null
cs.OH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper provides both theoretical and experimental evidence for the existence of an Energy/Frequency Convexity Rule, which relates energy consumption and CPU frequency on mobile devices. We monitored a typical smartphone running a specific computing-intensive kernel of multiple nested loops written in C using a high-resolution power gauge. Data gathered during a week-long acquisition campaign suggest that energy consumed per input element is strongly correlated with CPU frequency, and, more interestingly, the curve exhibits a clear minimum over a 0.2 GHz to 1.6 GHz window. We provide and motivate an analytical model for this behavior, which fits well with the data. Our work should be of clear interest to researchers focusing on energy usage and minimization for mobile devices, and provide new insights for optimization opportunities.
[ { "created": "Sun, 19 Jan 2014 11:16:00 GMT", "version": "v1" } ]
2014-01-21
[ [ "De Vogeleer", "Karel", "" ], [ "Memmi", "Gerard", "" ], [ "Jouvelot", "Pierre", "" ], [ "Coelho", "Fabien", "" ] ]
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1401.4657
Suman Kumar
Suman Kumar, K. Giridhar
Power Control Factor Selection in Uplink OFDMA Cellular Networks
arXiv admin note: text overlap with arXiv:1203.1304 by other authors
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Uplink power control plays a key role on the performance of uplink cellular network. In this work, the power control factor ($\in[0,1]$) is evaluated based on three parameters namely: average transmit power, coverage probability and average rate. In other words, we evaluate power control factor such that average transmit power should be low, coverage probability of cell-edge users should be high and also average rate over all the uplink users should be high. We show through numerical studies that the power control factor should be close to $0.5$ in order to achieve an acceptable trade-off between these three parameters.
[ { "created": "Sun, 19 Jan 2014 11:57:24 GMT", "version": "v1" }, { "created": "Mon, 3 Feb 2014 09:56:13 GMT", "version": "v2" } ]
2014-02-04
[ [ "Kumar", "Suman", "" ], [ "Giridhar", "K.", "" ] ]
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1401.4658
Yongming Li
Yongming Li, Yali Li, Zhanyou Ma
Computation Tree Logic Model Checking Based on Possibility Measures
30 pages, 5 figures
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In order to deal with the systematic verification with uncertain infromation in possibility theory, Li and Li \cite{li12} introduced model checking of linear-time properties in which the uncertainty is modeled by possibility measures. Xue, Lei and Li \cite{Xue09} defined computation tree logic (CTL) based on possibility measures, which is called possibilistic CTL (PoCTL). This paper is a continuation of the above work. First, we study the expressiveness of PoCTL. Unlike probabilistic CTL, it is shown that PoCTL (in particular, qualitative PoCTL) is more powerful than CTL with respect to their expressiveness. The equivalent expressions of basic CTL formulae using qualitative PoCTL formulae are presented in detail. Some PoCTL formulae that can not be expressed by any CTL formulae are presented. In particular, some qualitative properties of repeated reachability and persistence are expressed using PoCTL formulae. Next, adapting CTL model-checking algorithm, a method to solve the PoCTL model-checking problem and its time complexity are discussed in detail. Finally, an example is given to illustrate the PoCTL model-checking method.
[ { "created": "Sun, 19 Jan 2014 12:07:11 GMT", "version": "v1" } ]
2014-01-21
[ [ "Li", "Yongming", "" ], [ "Li", "Yali", "" ], [ "Ma", "Zhanyou", "" ] ]
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1401.4660
Cm Pintea
Gloria Cerasela Crisan, Camelia-M. Pintea, Petrica C. Pop
On the Resilience of an Ant-based System in Fuzzy Environments. An Empirical Study
This paper has been withdrawn by the author due to copyrights
IEEE International Conference on Fuzzy Systems (FUZZ-IEEE), 2588-2593 (2014)
10.1109/FUZZ-IEEE.2014.6891709
null
cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The current work describes an empirical study conducted in order to investigate the behavior of an optimization method in a fuzzy environment. MAX-MIN Ant System, an efficient implementation of a heuristic method is used for solving an optimization problem derived from the Traveling Salesman Problem (TSP). Several publicly-available symmetric TSP instances and their fuzzy variants are tested in order to extract some general features. The entry data was adapted by introducing a two-dimensional systematic degree of fuzziness, proportional with the number of nodes, the dimension of the instance and also with the distances between nodes, the scale of the instance. The results show that our proposed method can handle the data uncertainty, showing good resilience and adaptability.
[ { "created": "Sun, 19 Jan 2014 12:17:06 GMT", "version": "v1" }, { "created": "Sun, 16 Feb 2014 06:12:30 GMT", "version": "v2" } ]
2020-07-28
[ [ "Crisan", "Gloria Cerasela", "" ], [ "Pintea", "Camelia-M.", "" ], [ "Pop", "Petrica C.", "" ] ]
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1401.4662
Suman Kumar
Suman Kumar, Sheetal Kalyani, and K. Giridhar
Optimal Thresholds for Coverage and Rate in FFR Schemes for Planned Cellular Networks
Submitted to: IEEE Transactions on Communications
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null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Fractional frequency reuse (FFR) is an inter-cell interference coordination scheme that is being actively researched for emerging wireless cellular networks. In this work, we consider hexagonal tessellation based planned FFR deployments, and derive expressions for the coverage probability and normalized average rate for the downlink. In particular, given reuse $\frac{1}{3}$ (FR$3$ ) and reuse $1$ (FR$1$) regions, and a Signal-to-Interference-plus-noise-Ratio (SINR) threshold $S_{th}$ which decides the user assignment to either the FR$1$ or FR$3$ regions, we theoretically show that: $(i)$ The optimal choice of $S_{th}$ which maximizes the coverage probability is $S_{th} = T$, where $T$ is the required target SINR (for ensuring coverage), and $(ii)$ The optimal choice of $S_{th}$ which maximizes the normalized average rate is given by the expression $S_{th}=\max(T, T')$, where $T'$ is a function of the path loss exponent and the fade parameters. For the optimal choice of $S_{th}$, we show that FFR gives a higher rate than FR$1$ and a better coverage probability than FR$3$. The impact of frequency correlation over the sub-bands allocated to the FR$1$ and FR$3$ regions is analysed, and it is shown that correlation decreases the average rate of the FFR network. Numerical results are provided, and these match with the analytical results.
[ { "created": "Sun, 19 Jan 2014 12:27:26 GMT", "version": "v1" } ]
2014-01-21
[ [ "Kumar", "Suman", "" ], [ "Kalyani", "Sheetal", "" ], [ "Giridhar", "K.", "" ] ]
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1401.4663
Suman Kumar
Suman Kumar and Sheetal Kalyani
Impact of Correlation between Nakagami-m Interferers on Coverage Probability and Rate in Cellular Systems
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Coverage probability and rate expressions are theoretically compared for the following cases: $(i).$ Both the user channel and the $N$ interferers are independent and non identical Nakagami-m distributed random variables (RVs). $(ii).$ The $N$ interferers are correlated Nakagami-m RVs. It is analytically shown that the coverage probability in the presence of correlated interferers is greater than or equal to the coverage probability in the presence of non-identical independent interferers when the shape parameter of the channel between the user and its base station is not greater than one. It is further analytically shown that the average rate in the presence of correlated interferers is greater than or equal to the average rate in the presence of non-identical independent interferers. Simulation results are provided and these match with the obtained theoretical results. The utility of our results are also discussed.
[ { "created": "Sun, 19 Jan 2014 12:44:05 GMT", "version": "v1" }, { "created": "Fri, 25 Jul 2014 09:08:05 GMT", "version": "v2" } ]
2014-07-28
[ [ "Kumar", "Suman", "" ], [ "Kalyani", "Sheetal", "" ] ]
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1401.4666
Shaoshi Chen
Shaoshi Chen, Ruyong Feng, Ziming Li, and Michael F. Singer
Parallel Telescoping and Parameterized Picard--Vessiot Theory
19 pages
null
null
null
cs.SC math.CA
http://creativecommons.org/licenses/by/3.0/
Parallel telescoping is a natural generalization of differential creative-telescoping for single integrals to line integrals. It computes a linear ordinary differential operator $L$, called a parallel telescoper, for several multivariate functions, such that the applications of $L$ to the functions yield antiderivatives of a single function. We present a necessary and sufficient condition guaranteeing the existence of parallel telescopers for differentially finite functions, and develop an algorithm to compute minimal ones for compatible hyperexponential functions. Besides computing annihilators of parametric line integrals, we use the parallel telescoping for determining Galois groups of parameterized partial differential systems of first order.
[ { "created": "Sun, 19 Jan 2014 13:34:20 GMT", "version": "v1" } ]
2014-01-21
[ [ "Chen", "Shaoshi", "" ], [ "Feng", "Ruyong", "" ], [ "Li", "Ziming", "" ], [ "Singer", "Michael F.", "" ] ]
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1401.4672
Simone Righi
Simone Righi and K\'aroly Tak\'acs
Parallel versus Sequential Update and the Evolution of Cooperation with the Assistance of Emotional Strategies
14 pages, 2 figures
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physics.soc-ph cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Our study contributes to the debate on the evolution of cooperation in the single-shot Prisoner's Dilemma (PD) played on networks. We construct a model in which individuals are connected with positive and negative ties. Some agents play sign-dependent strategies that use the sign of the relation as a shorthand for determining appropriate action toward the opponent. In the context of our model in which network topology, agent strategic types and relational signs coevolve, the presence of sign-dependent strategies catalyzes the evolution of cooperation. We highlight how the success of cooperation depends on a crucial aspect of implementation: whether we apply parallel or sequential strategy update. Parallel updating, with averaging of payoffs across interactions in the social neighborhood, supports cooperation in a much wider set of parameter values than sequential updating. Our results cast doubts about the realism and generalizability of models that claim to explain the evolution of cooperation but implicitly assume parallel updating.
[ { "created": "Sun, 19 Jan 2014 14:35:30 GMT", "version": "v1" } ]
2014-01-21
[ [ "Righi", "Simone", "" ], [ "Takács", "Károly", "" ] ]
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1401.4674
Ronald Hochreiter
Ronald Hochreiter and Christoph Waldhauser
Evolving Accuracy: A Genetic Algorithm to Improve Election Night Forecasts
null
null
null
null
cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we apply genetic algorithms to the field of electoral studies. Forecasting election results is one of the most exciting and demanding tasks in the area of market research, especially due to the fact that decisions have to be made within seconds on live television. We show that the proposed method outperforms currently applied approaches and thereby provide an argument to tighten the intersection between computer science and social science, especially political science, further. We scrutinize the performance of our algorithm's runtime behavior to evaluate its applicability in the field. Numerical results with real data from a local election in the Austrian province of Styria from 2010 substantiate the applicability of the proposed approach.
[ { "created": "Sun, 19 Jan 2014 14:46:09 GMT", "version": "v1" } ]
2014-01-21
[ [ "Hochreiter", "Ronald", "" ], [ "Waldhauser", "Christoph", "" ] ]
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1401.4676
Enys Mones
Enys Mones, P\'eter Pollner and Tam\'as Vicsek
Universal hierarchical behavior of citation networks
null
null
10.1088/1742-5468/2014/05/P05023
null
physics.soc-ph cs.DL cs.SI physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Many of the essential features of the evolution of scientific research are imprinted in the structure of citation networks. Connections in these networks imply information about the transfer of knowledge among papers, or in other words, edges describe the impact of papers on other publications. This inherent meaning of the edges infers that citation networks can exhibit hierarchical features, that is typical of networks based on decision-making. In this paper, we investigate the hierarchical structure of citation networks consisting of papers in the same field. We find that the majority of the networks follow a universal trend towards a highly hierarchical state, and i) the various fields display differences only concerning their phase in life (distance from the "birth" of a field) or ii) the characteristic time according to which they are approaching the stationary state. We also show by a simple argument that the alterations in the behavior are related to and can be understood by the degree of specialization corresponding to the fields. Our results suggest that during the accumulation of knowledge in a given field, some papers are gradually becoming relatively more influential than most of the other papers.
[ { "created": "Sun, 19 Jan 2014 14:54:15 GMT", "version": "v1" } ]
2014-05-23
[ [ "Mones", "Enys", "" ], [ "Pollner", "Péter", "" ], [ "Vicsek", "Tamás", "" ] ]
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1401.4677
Hisham Abdel-Aal
H. A. Abdel-Aal, M. El Mansori
Characterization of load bearing metrological parameters in reptilian exuviae in comparison to precision finished cylinder liner surfaces
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null
null
null
physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Design of precise functional surfaces is essential for many future applications. In the technological realm, the accumulated experience with the construction of such surfaces is not sufficient. Nature provides many examples of dynamic surfaces worthy of study and adoption, at least as a concept, within human engineering. In this work, we probe load-bearing features of the ventral skin of snake surfaces. We examine the structure of two snake species that mainly move by rectilinear locomotion. These are Python regius (pythonidae) and Bittis gabonica (Vipridae). To this end, we focus on the load bearing characteristics of the ventral skin surface (i.e. the Rk family of parameters). Therefore, we draw detailed comparison between the reptilian surfaces and two sets of technological data. The first set pertains to an actual commercial cylinder liner, whereas, the second set is a summary of recommended surface finish metrological values for several commercial cylinder liner manufacturers. The results highlight several similarities between the two types of surfaces. In particular, we show that there is a striking correspondence between the sense of texture engineering within both surfaces (although that their construction evolved along entirely different paths). We also show that reptilian surfaces manifest a high degree of specialization with respect to habitat constraints on wear resistance and adhesive effects.
[ { "created": "Sun, 19 Jan 2014 14:57:50 GMT", "version": "v1" } ]
2014-01-21
[ [ "Abdel-Aal", "H. A.", "" ], [ "Mansori", "M. El", "" ] ]
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1401.4679
Gerardo Adesso
Gerardo Adesso, Sammy Ragy, Antony R. Lee
Continuous variable quantum information: Gaussian states and beyond
55 pages, 3 figures. Published in OSID special volume on open systems (44 SMP)
Open Syst. Inf. Dyn. 21, 1440001 (2014)
10.1142/S1230161214400010
null
quant-ph cond-mat.stat-mech math-ph math.MP physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The study of Gaussian states has arisen to a privileged position in continuous variable quantum information in recent years. This is due to vehemently pursued experimental realisations and a magnificently elegant mathematical framework. In this article, we provide a brief, and hopefully didactic, exposition of Gaussian state quantum information and its contemporary uses, including sometimes omitted crucial details. After introducing the subject material and outlining the essential toolbox of continuous variable systems, we define the basic notions needed to understand Gaussian states and Gaussian operations. In particular, emphasis is placed on the mathematical structure combining notions of algebra and symplectic geometry fundamental to a complete understanding of Gaussian informatics. Furthermore, we discuss the quantification of different forms of correlations (including entanglement and quantum discord) for Gaussian states, paying special attention to recently developed measures. The manuscript is concluded by succinctly expressing the main Gaussian state limitations and outlining a selection of possible future lines for quantum information processing with continuous variable systems.
[ { "created": "Sun, 19 Jan 2014 15:06:16 GMT", "version": "v1" }, { "created": "Tue, 21 Jan 2014 09:00:51 GMT", "version": "v2" }, { "created": "Fri, 14 Mar 2014 06:17:24 GMT", "version": "v3" } ]
2014-03-17
[ [ "Adesso", "Gerardo", "" ], [ "Ragy", "Sammy", "" ], [ "Lee", "Antony R.", "" ] ]
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1401.4680
Chong Wu
Chong Wu and Shenggong Ji and Rui Zhang and Liujun Chen and Jiawei Chen and Xiaobin Li and Yanqing Hu
Multiple Hybrid Phase Transition: Bootstrap Percolation on Complex Networks with Communities
null
null
10.1209/0295-5075/107/48001
null
physics.soc-ph cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Bootstrap percolation is a well-known model to study the spreading of rumors, new products or innovations on social networks. The empirical studies show that community structure is ubiquitous among various social networks. Thus, studying the bootstrap percolation on the complex networks with communities can bring us new and important insights of the spreading dynamics on social networks. It attracts a lot of scientists' attentions recently. In this letter, we study the bootstrap percolation on Erd\H{o}s-R\'{e}nyi networks with communities and observed second order, hybrid (both second and first order) and multiple hybrid phase transitions, which is rare in natural system. Moreover, we have analytically solved this system and obtained the phase diagram, which is further justified well by the corresponding simulations.
[ { "created": "Sun, 19 Jan 2014 15:11:53 GMT", "version": "v1" }, { "created": "Tue, 21 Jan 2014 10:17:20 GMT", "version": "v2" }, { "created": "Wed, 22 Jan 2014 14:40:10 GMT", "version": "v3" }, { "created": "Sat, 12 Apr 2014 12:34:35 GMT", "version": "v4" }, { "created": "Tue, 1 Jul 2014 10:46:52 GMT", "version": "v5" } ]
2015-06-18
[ [ "Wu", "Chong", "" ], [ "Ji", "Shenggong", "" ], [ "Zhang", "Rui", "" ], [ "Chen", "Liujun", "" ], [ "Chen", "Jiawei", "" ], [ "Li", "Xiaobin", "" ], [ "Hu", "Yanqing", "" ] ]
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1401.4684
Yukai Chen
Chen Yukai, Li Yuxiong, He Lijuan, Li Weimin
Theoretical analysis of BLM system for HLS II
null
null
null
null
physics.ins-det physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Hefei Light Source (HLS) is being upgraded to HLS II. Its emittance will be much lower than before, therefore the Touschek scattering will increase significantly and become the dominant factor of beam loss. So it is necessary to build a new beam loss monitoring (BLM) system differed from the old one to obtain the quantity and position information of lost electrons. This information is useful in the commissioning, troubleshooting and beam lifetime studying for HLS II. This paper analyzes the distribution features of different kinds of lost electrons, introduces the new machine's operation parameters and discusses the way to choose proper monitoring positions. Base on these comprehensive analysis, a new BLM system for HLS II is proposed.
[ { "created": "Sun, 19 Jan 2014 15:54:19 GMT", "version": "v1" } ]
2014-01-21
[ [ "Yukai", "Chen", "" ], [ "Yuxiong", "Li", "" ], [ "Lijuan", "He", "" ], [ "Weimin", "Li", "" ] ]
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1401.4686
Vladimir Burdyuzha
Vladimir Burdyuzha
Testing of Dark Energy and a Solution of the Cosmological Constant Problem
5 pages
Talk on XXVII Texas Symposium on Relativistic Astrophysics, December 8-13, 2013, Dallas
null
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A probable solution of the cosmological constant problem was recently found. We propose that dark energy of the Universe is vacuum energy. Our Universe during its expansion is spending its vacuum energy for creation of new quantum states, but in the quantum regime phase transitions were more effective in reducing the vacuum energy than creation of new quantum states. Here we show how the 123 crisis orders of the vacuum energy are reduced by conventional physical processes in both the quantum and classical regimes of the Universe evolution. Numeral estimates of dark energy evolution are also presented.
[ { "created": "Sun, 19 Jan 2014 16:04:09 GMT", "version": "v1" } ]
2014-01-21
[ [ "Burdyuzha", "Vladimir", "" ] ]
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1401.4687
Fazal Ghafoor
Bakht A Bacha, Fazal Ghafoor, Rashid G Nazmidinov
Slow and fast light dynamics in a chiral cold and hot atomic medium
8 pages, 8 figures
null
null
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study Chiral Based Electromagnetically Induced Transparency (CBEIT) of a light pulse and its associated subluminal and superluminal behavior through a cold and a hot medium of 4-level \textit{double-Lambda type} atomic system. The dynamical behavior of this chiral based system is temperature dependent. The magnetic field based chirality and dispersion is always opposite as compared with the electric field ones. Contrastingly, the response of the chiral effect along with the incoherence Doppler broadening mechanism enhances the superluminal behavior as compared with its traditional degrading effect. Nevertheless, the intensity of a coupled microwave field destroys the coherence of the medium and degrade superluminality and subluminality of the sysmtem. The undistorted retrieved pulse from a hot chiral medium delays by $896 ns$ than from a cold chiral medium under same set of parameters. Nevertheless, it advances by $-31n s$ in the cold chiral medium when a suitably different spectroscopic parameters are selected. The corresponding group index of the medium and the time delay/advance, are studied and analyzed explicitly [Note: A revise version is under preparation
[ { "created": "Sun, 19 Jan 2014 16:04:44 GMT", "version": "v1" } ]
2014-01-21
[ [ "Bacha", "Bakht A", "" ], [ "Ghafoor", "Fazal", "" ], [ "Nazmidinov", "Rashid G", "" ] ]
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1401.4691
Ronald Hochreiter
Stefan Hochrainer and Ronald Hochreiter and Georg Pflug
An algorithm for calculating steady state probabilities of $M|E_r|c|K$ queueing systems
null
Central European Journal of Operations Research 13(1): 1-13. 2005
null
null
cs.SY cs.PF
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a method for calculating steady state probabilities of $M|E_r|c|K$ queueing systems. The infinitesimal generator matrix is used to define all possible states in the system and their transition probabilities. While this matrix can be written down immediately for many other $M|PH|c|K$ queueing systems with phase-type service times (e.g. Coxian, Hypoexponential, \ldots), it requires a more careful analysis for systems with Erlangian service times. The constructed matrix may then be used to calculate steady state probabilities using an iterative algorithm. The resulting steady state probabilities can be used to calculate various performance measures, e.g. the average queue length. Additionally, computational issues of the implementation are discussed and an example from the field of telecommunication call-center queue length will be outlined to substantiate the applicability of these efforts. In the appendix, tables of the average queueing length given a specific number of service channels, traffic density, and system size are presented.
[ { "created": "Sun, 19 Jan 2014 16:25:38 GMT", "version": "v1" } ]
2014-01-21
[ [ "Hochrainer", "Stefan", "" ], [ "Hochreiter", "Ronald", "" ], [ "Pflug", "Georg", "" ] ]
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1401.4696
Ronald Hochreiter
Ronald Hochreiter
Evolutionary Optimization for Decision Making under Uncertainty
Keynote talk at the MENDEL 2011
Proceedings of MENDEL 2011: 107-113. 2011
null
null
cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Optimizing decision problems under uncertainty can be done using a variety of solution methods. Soft computing and heuristic approaches tend to be powerful for solving such problems. In this overview article, we survey Evolutionary Optimization techniques to solve Stochastic Programming problems - both for the single-stage and multi-stage case.
[ { "created": "Sun, 19 Jan 2014 16:42:57 GMT", "version": "v1" } ]
2014-01-21
[ [ "Hochreiter", "Ronald", "" ] ]
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1401.4697
Ola Mahmoud
Marcelo Fiore and Ola Mahmoud
Functorial Semantics of Second-Order Algebraic Theories
null
null
null
null
math.CT cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The purpose of this work is to complete the algebraic foundations of second-order languages from the viewpoint of categorical algebra as developed by Lawvere. To this end, this paper introduces the notion of second-order algebraic theory and develops its basic theory. A crucial role in the definition is played by the second-order theory of equality $\M$, representing the most elementary operators and equations present in every second-order language. The category $\M$ can be described abstractly via the universal property of being the free cartesian category on an exponentiable object. Thereby, in the tradition of categorical algebra, a second-order algebraic theory consists of a cartesian category $\Mlaw$ and a strict cartesian identity-on-objects functor $\M \to \Mlaw$ that preserves the universal exponentiable object of $\Mlaw$. Lawvere's functorial semantics for algebraic theories can then be generalised to the second-order setting. To verify the correctness of our theory, two categorical equivalences are established: at the syntactic level, that of second-order equational presentations and second-order algebraic theories; at the semantic level, that of second-order algebras and second-order functorial models.
[ { "created": "Sun, 19 Jan 2014 16:47:39 GMT", "version": "v1" } ]
2014-01-21
[ [ "Fiore", "Marcelo", "" ], [ "Mahmoud", "Ola", "" ] ]
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1401.4699
Roman Planeta
N.Abgrall, O.Andreeva, A.Aduszkiewicz, Y.Ali, T.Anticic, N.Antoniou, B.Baatar, F.Bay, A.Blondel, J.Blumer, M.Bogomilov, M.Bogusz, A.Bravar, J.Brzychczyk, S.A.Bunyatov, P.Christakoglou, T.Czopowicz, N.Davis, S.Debieux, H.Dembinski, F.Diakonos, S.DiLuise, W.Dominik, T.Drozhzhova, J.Dumarchez, K.Dynowski, R.Engel, I.Efthymiopoulos, A.Ereditato, A.Fabich, G.A.Feofilov, Z.Fodor, A.Fulop, M.Gazdzicki, M.Golubeva, K.Grebieszkow, A.Grzeszczuk, F.Guber, A.Haesler, T.Hasegawa, M.Hierholzer, R.Idczak, S.Igolkin, A.Ivashkin, D.Jokovic, K.Kadija, A.Kapoyannis, E.Kaptur, D.Kielczewska, M.Kirejczyk, J.Kisiel, T.Kiss, S.Kleinfelder, T.Kobayashi, V.I.Kolesnikov, D.Kolev, V.P.Kondratiev, A.Korzenev, P.Koversarski, S.Kowalski, A.Krasnoperov, A.Kurepin, D.Larsen, A.Laszlo, V.V.Lyubushkin, M.Mackowiak-Pawlowska, Z.Majka, B.Maksiak, A.I.Malakhov, D.Maletic, D.Manglunki, D.Manic, A.Marchionni, A.Marcinek, V.Marin, K.Marton, H.-J.Mathes, T.Matulewicz, V.Matveev, G.L.Melkumov, M.Messina, St.Mrowczynski, S.Murphy, T.Nakadaira, M.Nirkko, K.Nishikawa, T.Palczewski, G.Palla, A.D.Panagiotou, T.Paul, W.Peryt, O.Petukhov, C.Pistillo, R.Planeta, J.Pluta, B.A.Popov, M.Posiadala, S.Pulawski, J.Puzovic, W.Rauch, M.Ravonel, A.Redij, R.Renfordt, E.Richter-Was, A.Robert, D.Rohrich, E.Rondio, B.Rossi, M.Roth, A.Rubbia, A.Rustamov, M.Rybczynski, A.Sadovsky, K.Sakashita, M.Savic, K.Schmidt, T.Sekiguchi, P.Seyboth, D.Sgalaberna, M.Shibata, R.Sipos, E.Skrzypczak, M.Slodkowski, Z.Sosin, P.Staszel, G.Stefanek, J.Stepaniak, H.Stroebele, T.Susa, M.Szuba, M.Tada, V.Tereshchenko, T.Tolyhi, R.Tsenov, L.Turko, R.Ulrich, M.Unger, M.Vassiliou, D.Veberic, V.V.Vechernin, G.Vesztergombi, L.Vinogradov, A.Wilczek, Z.Wlodarczyk, A.Wojtaszek-Szwarz, O.Wyszynski, L.Zambelli, W.Zipper
NA61/SHINE facility at the CERN SPS: beams and detector system
null
JINST 9 (2014) P06005
10.1088/1748-0221/9/06/P06005
CERN-PH-EP-2014-003
physics.ins-det nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
NA61/SHINE (SPS Heavy Ion and Neutrino Experiment) is a multi-purpose experimental facility to study hadron production in hadron-proton, hadron-nucleus and nucleus-nucleus collisions at the CERN Super Proton Synchrotron. It recorded the first physics data with hadron beams in 2009 and with ion beams (secondary 7Be beams) in 2011. NA61/SHINE has greatly profited from the long development of the CERN proton and ion sources and the accelerator chain as well as the H2 beamline of the CERN North Area. The latter has recently been modified to also serve as a fragment separator as needed to produce the Be beams for NA61/SHINE. Numerous components of the NA61/SHINE set-up were inherited from its predecessors, in particular, the last one, the NA49 experiment. Important new detectors and upgrades of the legacy equipment were introduced by the NA61/SHINE Collaboration. This paper describes the state of the NA61/SHINE facility - the beams and the detector system - before the CERN Long Shutdown I, which started in March 2013.
[ { "created": "Sun, 19 Jan 2014 16:49:25 GMT", "version": "v1" } ]
2014-07-03
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1401.4704
Giorgio Fagiolo
Martha G. Alatriste Contreras, Giorgio Fagiolo
Propagation of Economic Shocks in Input-Output Networks: A Cross-Country Analysis
9 pages, 12 figures, supplemental material section
null
null
null
q-fin.GN physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper investigates how economic shocks propagate and amplify through the input-output network connecting industrial sectors in developed economies. We study alternative models of diffusion on networks and we calibrate them using input-output data on real-world inter-sectoral dependencies for several European countries before the Great Depression. We show that the impact of economic shocks strongly depends on the nature of the shock and country size. Shocks that impact on final demand without changing production and the technological relationships between sectors have on average a large but very homogeneous impact on the economy. Conversely, when shocks change also the magnitudes of input-output across-sector interdependencies (and possibly sector production), the economy is subject to predominantly large but more heterogeneous avalanche sizes. In this case, we also find that: (i) the more a sector is globally central in the country network, the largest its impact; (ii) the largest European countries, such as those constituting the core of the European Union's economy, typically experience the largest avalanches, signaling their intrinsic higher vulnerability to economic shocks.
[ { "created": "Sun, 19 Jan 2014 17:15:42 GMT", "version": "v1" }, { "created": "Tue, 1 Apr 2014 19:45:46 GMT", "version": "v2" } ]
2014-04-02
[ [ "Contreras", "Martha G. Alatriste", "" ], [ "Fagiolo", "Giorgio", "" ] ]
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1401.4705
Sanjib Kumar Agarwalla
Sanjib Kumar Agarwalla
Physics Potential of Long-Baseline Experiments
44 pages, 37 pdf figures, 5 tables. Review article to appear in Advances in High Energy Physics
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null
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hep-ph hep-ex physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The discovery of neutrino mixing and oscillations over the past decade provides firm evidence for new physics beyond the Standard Model. Recently, theta13 has been determined to be moderately large, quite close to its previous upper bound. This represents a significant milestone in establishing the three-flavor oscillation picture of neutrinos. It has opened up exciting prospects for current and future long-baseline neutrino oscillation experiments towards addressing the remaining fundamental questions, in particular the type of the neutrino mass hierarchy and the possible presence of a CP-violating phase. Another recent and crucial development is the indication of non-maximal 2-3 mixing angle, causing the octant ambiguity of theta23. In this paper, I will review the phenomenology of long-baseline neutrino oscillations with a special emphasis on sub-leading three-flavor effects, which will play a crucial role in resolving these unknowns. First, I will give a brief description of neutrino oscillation phenomenon. Then, I will discuss our present global understanding of the neutrino mass-mixing parameters and will identify the major unknowns in this sector. After that, I will present the physics reach of current generation long-baseline experiments. Finally, I will conclude with a discussion on the physics capabilities of accelerator-driven possible future long-baseline precision oscillation facilities.
[ { "created": "Sun, 19 Jan 2014 17:20:53 GMT", "version": "v1" } ]
2014-01-21
[ [ "Agarwalla", "Sanjib Kumar", "" ] ]
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1401.4707
Mikhail Shneider
M. Pekker and M.N. Shneider
The surface charge of a cell lipid membrane
null
J Phys Chem Biophys 5: 177 (2015)
10.4172/2161-0398.1000177
null
physics.bio-ph cond-mat.soft q-bio.BM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper the problem of surface charge of the lipid membrane immersed in the physiological solution is considered. It is shown that both side of the bilayer phospholipid membrane surface are negatively charged. A self-consistent model of the potential in solution is developed, and a stationary charge density on the membrane surface is found. It is shown that the ions of the surface charge are in a relatively deep (as compared to kBT) potential wells, which are localized near the dipole heads of phospholipid membrane. It makes impossible for ions to slip along the membrane surface. Simple experiments for verifying the correctness of the considered model are proposed. A developed approach can be used for estimations of the surface charges on the outer and inner membrane of the cell.
[ { "created": "Sun, 19 Jan 2014 17:48:15 GMT", "version": "v1" }, { "created": "Sun, 26 Oct 2014 12:51:57 GMT", "version": "v2" } ]
2015-05-14
[ [ "Pekker", "M.", "" ], [ "Shneider", "M. N.", "" ] ]
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1401.4709
Rodrigo de Lamare
T. Peng, R. C. de Lamare and A. Schmeink
Adaptive Power Allocation Strategies using DSTC in Cooperative MIMO Networks
5 figures, 9 pages. IET Communications, 2014
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Adaptive Power Allocation (PA) algorithms with different criteria for a cooperative Multiple-Input Multiple-Output (MIMO) network equipped with Distributed Space-Time Coding (DSTC) are proposed and evaluated. Joint constrained optimization algorithms to determine the power allocation parameters, the channel parameters and the receive filter are proposed for each transmitted stream in each link. Linear receive filter and maximum-likelihood (ML) detection are considered with Amplify-and-Forward (AF) and Decode-and-Forward (DF) cooperation strategies. In the proposed algorithms, the elements in the PA matrices are optimized at the destination node and then transmitted back to the relay nodes via a feedback channel. The effects of the feedback errors are considered. Linear MMSE expressions and the PA matrices depend on each other and are updated iteratively. Stochastic gradient (SG) algorithms are developed with reduced computational complexity. Simulation results show that the proposed algorithms obtain significant performance gains as compared to existing power allocation schemes.
[ { "created": "Sun, 19 Jan 2014 18:12:39 GMT", "version": "v1" } ]
2014-01-21
[ [ "Peng", "T.", "" ], [ "de Lamare", "R. C.", "" ], [ "Schmeink", "A.", "" ] ]
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1401.4712
Olivier Bodini
Olivier Bodini (LIPN), David Julien (LIPN), Marchal Philippe (LAGA)
Random-bit optimal uniform sampling for rooted planar trees with given sequence of degrees and Applications
19 pages
null
null
null
cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we redesign and simplify an algorithm due to Remy et al. for the generation of rooted planar trees that satisfies a given partition of degrees. This new version is now optimal in terms of random bit complexity, up to a multiplicative constant. We then apply a natural process "simulate-guess-and-proof" to analyze the height of a random Motzkin in function of its frequency of unary nodes. When the number of unary nodes dominates, we prove some unconventional height phenomenon (i.e. outside the universal square root behaviour.)
[ { "created": "Sun, 19 Jan 2014 18:17:01 GMT", "version": "v1" } ]
2014-01-21
[ [ "Bodini", "Olivier", "", "LIPN" ], [ "Julien", "David", "", "LIPN" ], [ "Philippe", "Marchal", "", "LAGA" ] ]
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1401.4714
Ronald Hochreiter
Ronald Hochreiter and Christoph Waldhauser
Revolutionary Algorithms
null
Proceedings of BIOMA 2012: 37-48. 2012
null
null
cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The optimization of dynamic problems is both widespread and difficult. When conducting dynamic optimization, a balance between reinitialization and computational expense has to be found. There are multiple approaches to this. In parallel genetic algorithms, multiple sub-populations concurrently try to optimize a potentially dynamic problem. But as the number of sub-population increases, their efficiency decreases. Cultural algorithms provide a framework that has the potential to make optimizations more efficient. But they adapt slowly to changing environments. We thus suggest a confluence of these approaches: revolutionary algorithms. These algorithms seek to extend the evolutionary and cultural aspects of the former to approaches with a notion of the political. By modeling how belief systems are changed by means of revolution, these algorithms provide a framework to model and optimize dynamic problems in an efficient fashion.
[ { "created": "Sun, 19 Jan 2014 18:27:41 GMT", "version": "v1" } ]
2014-01-21
[ [ "Hochreiter", "Ronald", "" ], [ "Waldhauser", "Christoph", "" ] ]
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1401.4715
Moshe Schwartz
Mario Blaum, James S. Plank, Moshe Schwartz, Eitan Yaakobi
Construction of Partial MDS (PMDS) and Sector-Disk (SD) Codes with Two Global Parity Symbols
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Partial MDS (PMDS) codes are erasure codes combining local (row) correction with global additional correction of entries, while Sector-Disk (SD) codes are erasure codes that address the mixed failure mode of current RAID systems. It has been an open problem to construct general codes that have the PMDS and the SD properties, and previous work has relied on Monte-Carlo searches. In this paper, we present a general construction that addresses the case of any number of failed disks and in addition, two erased sectors. The construction requires a modest field size. This result generalizes previous constructions extending RAID~5 and RAID~6.
[ { "created": "Sun, 19 Jan 2014 18:31:52 GMT", "version": "v1" } ]
2014-01-21
[ [ "Blaum", "Mario", "" ], [ "Plank", "James S.", "" ], [ "Schwartz", "Moshe", "" ], [ "Yaakobi", "Eitan", "" ] ]
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1401.4716
Jun Huang
Yunlong He and Jun Huang and Qiang Duan and Zi Xiong and Juan Lv and Yanbing Liu
A Novel Admission Control Model in Cloud Computing
null
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
With the rapid development of Cloud computing technologies and wide adopt of Cloud services and applications, QoS provisioning in Clouds becomes an important research topic. In this paper, we propose an admission control mechanism for Cloud computing. In particular we consider the high volume of simultaneous requests for Cloud services and develop admission control for aggregated traffic flows to address this challenge. By employ network calculus, we determine effective bandwidth for aggregate flow, which is used for making admission control decision. In order to improve network resource allocation while achieving Cloud service QoS, we investigate the relationship between effective bandwidth and equivalent capacity. We have also conducted extensive experiments to evaluate performance of the proposed admission control mechanism.
[ { "created": "Sun, 19 Jan 2014 18:36:35 GMT", "version": "v1" }, { "created": "Sun, 26 Jan 2014 02:53:18 GMT", "version": "v2" } ]
2014-01-28
[ [ "He", "Yunlong", "" ], [ "Huang", "Jun", "" ], [ "Duan", "Qiang", "" ], [ "Xiong", "Zi", "" ], [ "Lv", "Juan", "" ], [ "Liu", "Yanbing", "" ] ]
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1401.4720
Bruno Grenet
Bruno Grenet
Computing low-degree factors of lacunary polynomials: a Newton-Puiseux approach
22 pages
Proceedings of the 39th International Symposium on Symbolic and Algebraic Computation (ISSAC'14), pp 224-231, ACM, 2014
10.1145/2608628.2608649
null
cs.SC cs.CC cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a new algorithm for the computation of the irreducible factors of degree at most $d$, with multiplicity, of multivariate lacunary polynomials over fields of characteristic zero. The algorithm reduces this computation to the computation of irreducible factors of degree at most $d$ of univariate lacunary polynomials and to the factorization of low-degree multivariate polynomials. The reduction runs in time polynomial in the size of the input polynomial and in $d$. As a result, we obtain a new polynomial-time algorithm for the computation of low-degree factors, with multiplicity, of multivariate lacunary polynomials over number fields, but our method also gives partial results for other fields, such as the fields of $p$-adic numbers or for absolute or approximate factorization for instance. The core of our reduction uses the Newton polygon of the input polynomial, and its validity is based on the Newton-Puiseux expansion of roots of bivariate polynomials. In particular, we bound the valuation of $f(X,\phi)$ where $f$ is a lacunary polynomial and $\phi$ a Puiseux series whose vanishing polynomial has low degree.
[ { "created": "Sun, 19 Jan 2014 19:23:24 GMT", "version": "v1" }, { "created": "Tue, 24 Jun 2014 07:38:52 GMT", "version": "v2" } ]
2014-07-11
[ [ "Grenet", "Bruno", "" ] ]
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1401.4721
Sugata Sanyal
Sugata Sanyal
Energy Harvesting in M2M and WSN Space
3 pages
null
null
null
cs.NI cs.ET
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Energy harvesting or power harvesting or energy scavenging is a process where energy is derived from external sources (e.g. solar power, thermal energy, wind energy, salinity gradients, kinetic energy etc.), captured, and stored for small, wireless autonomous devices, like those used in wearable electronics and wireless sensor networks. This paper is focused to applications of Energy Harvesting in Wireless Sensor Networks. This is going to help the ever growing M2M (Machine to Machine) field where there is an exponential growth of intelligent devices and automatic control of these is of paramount importance.
[ { "created": "Sun, 19 Jan 2014 19:28:08 GMT", "version": "v1" } ]
2014-01-21
[ [ "Sanyal", "Sugata", "" ] ]
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1401.4725
Diogo Pratas
Armando J. Pinho, Diogo Pratas, and Paulo J. S. G. Ferreira
Information profiles for DNA pattern discovery
Full version of DCC 2014 paper "Information profiles for DNA pattern discovery"
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null
null
q-bio.GN cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Finite-context modeling is a powerful tool for compressing and hence for representing DNA sequences. We describe an algorithm to detect genomic regularities, within a blind discovery strategy. The algorithm uses information profiles built using suitable combinations of finite-context models. We used the genome of the fission yeast Schizosaccharomyces pombe strain 972 h- for illustration, unveilling locations of low information content, which are usually associated with DNA regions of potential biological interest.
[ { "created": "Sun, 19 Jan 2014 19:44:07 GMT", "version": "v1" } ]
2014-01-21
[ [ "Pinho", "Armando J.", "" ], [ "Pratas", "Diogo", "" ], [ "Ferreira", "Paulo J. S. G.", "" ] ]
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1401.4726
Rainer H\"orbe
Rainer Hoerbe
A Model for Privacy-enhanced Federated Identity Management
36 pages
null
null
null
cs.CR
http://creativecommons.org/licenses/by-nc-sa/3.0/
Identity federations operating in a business or consumer context need to prevent the collection of user data across trust service providers for legal and business case reasons. Legal reasons are given by data protection legislation. Other reasons include business owners becoming increasingly aware of confidentiality risks that go beyond traditional information security, e.g., the numbers of authentications to an EDI service might provide insights into the volume of invoices, from which one could derive insider information. This paper proposes extended technical controls supporting three privacy requirements: a) Limit d Linkability: Two service providers cannot link data related to a user without the help of a third party, using neither an identifier nor other identifying attributes like email addresses or payment data; b) Limited Observability: An identity provider cannot trace which services a user is using without the help of a third party; c) Non-Disclosure: Attributes provided to the service provider by an attribute provider are not disclosed to the identity provider or an intermediate service broker. Using a hub-and-spoke federation style following the privacy-by-design principle, this reference architecture addresses the privacy controls mentioned above.
[ { "created": "Sun, 19 Jan 2014 19:44:38 GMT", "version": "v1" } ]
2014-01-21
[ [ "Hoerbe", "Rainer", "" ] ]
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1401.4730
Masoud Koleini
Masoud Koleini and Eike Ritter and Mark Ryan
Verification of agent knowledge in dynamic access control policies
The original version of this paper, "Model checking agent knowledge in dynamic access control policies", appeared in Lecture Notes in Computer Science (LNCS), Volume 7795, 2013, pp 448-462
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cs.LO cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We develop a modeling technique based on interpreted systems in order to verify temporal-epistemic properties over access control policies. This approach enables us to detect information flow vulnerabilities in dynamic policies by verifying the knowledge of the agents gained by both reading and reasoning about system information. To overcome the practical limitations of state explosion in model-checking temporal-epistemic properties, we introduce a novel abstraction and refinement technique for temporal-epistemic safety properties in ACTLK (ACTL with knowledge modality K) and a class of interesting properties that does fall in this category.
[ { "created": "Sun, 19 Jan 2014 19:59:24 GMT", "version": "v1" } ]
2014-01-21
[ [ "Koleini", "Masoud", "" ], [ "Ritter", "Eike", "" ], [ "Ryan", "Mark", "" ] ]
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1401.4733
Omar Gamel
Omar Gamel and Daniel F. V. James
Majorization and Measures of Classical Polarization in Three Dimensions
8 pages
JOSA A, Vol. 31, Issue 7, pp. 1620-1626 (2014)
10.1364/JOSAA.31.001620
null
physics.optics quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
There has been much discussion in the literature about rival measures of classical polarization in three dimensions. We gather and compare the various proposed measures of polarization, creating a geometric representation of the polarization state space in the process. We use majorization, previously used in quantum information, as a criterion to establish a partial ordering on the polarization state space. Using this criterion and other considerations, the most useful polarization measure in three dimensions is found to be one dependent on the Bloch vector decomposition of the polarization matrix.
[ { "created": "Sun, 19 Jan 2014 20:13:26 GMT", "version": "v1" }, { "created": "Mon, 10 Mar 2014 02:56:40 GMT", "version": "v2" } ]
2014-06-26
[ [ "Gamel", "Omar", "" ], [ "James", "Daniel F. V.", "" ] ]
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1401.4734
Natalia Silberstein
Natalia Silberstein and Tuvi Etzion
Optimal Fractional Repetition Codes based on Graphs and Designs
null
null
null
null
cs.IT cs.DM math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Fractional repetition (FR) codes is a family of codes for distributed storage systems that allow for uncoded exact repairs having the minimum repair bandwidth. However, in contrast to minimum bandwidth regenerating (MBR) codes, where a random set of a certain size of available nodes is used for a node repair, the repairs with FR codes are table based. This usually allows to store more data compared to MBR codes. In this work, we consider bounds on the fractional repetition capacity, which is the maximum amount of data that can be stored using an FR code. Optimal FR codes which attain these bounds are presented. The constructions of these FR codes are based on combinatorial designs and on families of regular and biregular graphs. These constructions of FR codes for given parameters raise some interesting questions in graph theory. These questions and some of their solutions are discussed in this paper. In addition, based on a connection between FR codes and batch codes, we propose a new family of codes for DSS, namely fractional repetition batch codes, which have the properties of batch codes and FR codes simultaneously. These are the first codes for DSS which allow for uncoded efficient exact repairs and load balancing which can be performed by several users in parallel. Other concepts related to FR codes are also discussed.
[ { "created": "Sun, 19 Jan 2014 20:26:50 GMT", "version": "v1" }, { "created": "Tue, 30 Sep 2014 10:52:57 GMT", "version": "v2" }, { "created": "Wed, 21 Jan 2015 13:57:41 GMT", "version": "v3" } ]
2015-01-22
[ [ "Silberstein", "Natalia", "" ], [ "Etzion", "Tuvi", "" ] ]
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1401.4735
Samson Abramsky
Samson Abramsky
Axioms for Definability and Full Completeness
18 pages
In Proof, language, and Interaction, MIT Press, pp. 55-76. 2000
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Axioms are presented which encapsulate the properties satisfied by categories of games which form the basis of results on full abstraction for PCF and other programming languages, and on full completeness for various logics and type theories. Axioms are presented on models of PCF from which full abstraction can be proved. These axioms have been distilled from recent results on definability and full abstraction of game semantics for a number of programming languages. Full completeness for pure simply-typed $\lambda$-calculus is also axiomatized.
[ { "created": "Sun, 19 Jan 2014 20:33:58 GMT", "version": "v1" }, { "created": "Tue, 21 Jan 2014 10:09:12 GMT", "version": "v2" } ]
2014-01-22
[ [ "Abramsky", "Samson", "" ] ]
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1401.4737
Xmass Publications
H. Uchida, K. Abe, K. Hieda, K. Hiraide, S. Hirano, K. Ichimura, Y. Kishimoto, K. Kobayashi, S. Moriyama, K. Nakagawa, M. Nakahata, H. Ogawa, N. Oka, H. Sekiya, A. Shinozaki, Y. Suzuki, A. Takeda, O. Takachio, D. Umemoto, M. Yamashita, B. S. Yang, S. Tasaka, J. Liu, K. Martens, K. Hosokawa, K. Miuchi, A. Murata, Y. Onishi, Y. Otsuka, Y. Takeuchi, Y. H. Kim, K. B. Lee, M. K. Lee, J. S. Lee, Y. Fukuda, Y. Itow, K. Masuda, Y. Nishitani, H. Takiya, N. Y. Kim, Y. D. Kim, F. Kusaba, K. Nishijima, K. Fujii, I. Murayama, and S. Nakamura
Search for inelastic WIMP nucleus scattering on $^{129}$Xe in data from the XMASS-I experiment
13 pages, 7 figures, to be published in PTEP
null
10.1093/ptep/ptu064
null
astro-ph.CO hep-ex nucl-ex physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A search for inelastic scattering of Weakly Interacting Massive Particles (WIMPs) on the isotope $^{129}$Xe was done in data taken with the single phase liquid xenon detector XMASS at the Kamioka Observatory. Using a restricted volume containing 41 kg of LXe at the very center of our detector we observed no significant excess of events in 165.9 days of data. Our background reduction allowed us to derive our limits without explicitly subtracting the remaining events which are compatible with background expectations and derive for e.g. a 50 GeV WIMP an upper limit for its inelastic cross section on $^{129}$Xe nuclei of 3.2 pb at the 90% confidence level.
[ { "created": "Sun, 19 Jan 2014 21:00:05 GMT", "version": "v1" }, { "created": "Thu, 23 Jan 2014 13:51:14 GMT", "version": "v2" }, { "created": "Thu, 10 Apr 2014 10:29:14 GMT", "version": "v3" }, { "created": "Tue, 29 Apr 2014 11:28:31 GMT", "version": "v4" } ]
2016-06-21
[ [ "Uchida", "H.", "" ], [ "Abe", "K.", "" ], [ "Hieda", "K.", "" ], [ "Hiraide", "K.", "" ], [ "Hirano", "S.", "" ], [ "Ichimura", "K.", "" ], [ "Kishimoto", "Y.", "" ], [ "Kobayashi", "K.", "" ], [ "Moriyama", "S.", "" ], [ "Nakagawa", "K.", "" ], [ "Nakahata", "M.", "" ], [ "Ogawa", "H.", "" ], [ "Oka", "N.", "" ], [ "Sekiya", "H.", "" ], [ "Shinozaki", "A.", "" ], [ "Suzuki", "Y.", "" ], [ "Takeda", "A.", "" ], [ "Takachio", "O.", "" ], [ "Umemoto", "D.", "" ], [ "Yamashita", "M.", "" ], [ "Yang", "B. S.", "" ], [ "Tasaka", "S.", "" ], [ "Liu", "J.", "" ], [ "Martens", "K.", "" ], [ "Hosokawa", "K.", "" ], [ "Miuchi", "K.", "" ], [ "Murata", "A.", "" ], [ "Onishi", "Y.", "" ], [ "Otsuka", "Y.", "" ], [ "Takeuchi", "Y.", "" ], [ "Kim", "Y. H.", "" ], [ "Lee", "K. B.", "" ], [ "Lee", "M. K.", "" ], [ "Lee", "J. S.", "" ], [ "Fukuda", "Y.", "" ], [ "Itow", "Y.", "" ], [ "Masuda", "K.", "" ], [ "Nishitani", "Y.", "" ], [ "Takiya", "H.", "" ], [ "Kim", "N. Y.", "" ], [ "Kim", "Y. D.", "" ], [ "Kusaba", "F.", "" ], [ "Nishijima", "K.", "" ], [ "Fujii", "K.", "" ], [ "Murayama", "I.", "" ], [ "Nakamura", "S.", "" ] ]
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1401.4739
Arash Rafiey
Jan Manuch and Arash Rafiey
Finding minimum Tucker submatrices
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cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A binary matrix has the Consecutive Ones Property (C1P) if its columns can be ordered in such a way that all 1s on each row are consecutive. These matrices are used for DNA physical mapping and ancestral genome reconstruction in computational biology on the other hand they represents a class of convex bipartite graphs and are of interest of algorithm graph theory researchers. Tucker gave a forbidden submartices characterization of matrices that have C1P property in 1972. Booth and Lucker (1976) gave a first linear time recognition algorithm for matrices with C1P property and then in 2002, Habib, et al. gave a simpler linear time recognition algorithm. There has been substantial amount of works on efficiently finding minimum size forbidden submatrix. Our algorithm is at least $n$ times faster than the existing algorithm where $n$ is the number of columns of the input matrix.
[ { "created": "Sun, 19 Jan 2014 21:24:33 GMT", "version": "v1" } ]
2014-01-21
[ [ "Manuch", "Jan", "" ], [ "Rafiey", "Arash", "" ] ]
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1401.4740
Noah Friedkin
Noah E. Friedkin
Generalization of the PageRank Model
null
null
null
null
cs.SI cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper develops a generalization of the PageRank model of page centralities in the global webgraph of hyperlinks. The webgraph of adjacencies is generalized to a valued directed graph, and the scalar dampening coefficient for walks through the graph is relaxed to allow for heterogeneous values. A visitation count approach may be employed to apply the more general model, based on the number of visits to a page and the page's proportionate allocations of these visits to other nodes of the webgraph.
[ { "created": "Sun, 19 Jan 2014 21:31:59 GMT", "version": "v1" } ]
2014-01-21
[ [ "Friedkin", "Noah E.", "" ] ]
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1401.4744
Daniel Roche
Andrew Arnold, Mark Giesbrecht, Daniel S. Roche
Sparse interpolation over finite fields via low-order roots of unity
18 pages, 1 table, 4 procedures, accepted to ISSAC 2014
null
null
null
cs.SC
http://creativecommons.org/licenses/publicdomain/
We present a new Monte Carlo algorithm for the interpolation of a straight-line program as a sparse polynomial $f$ over an arbitrary finite field of size $q$. We assume a priori bounds $D$ and $T$ are given on the degree and number of terms of $f$. The approach presented in this paper is a hybrid of the diversified and recursive interpolation algorithms, the two previous fastest known probabilistic methods for this problem. By making effective use of the information contained in the coefficients themselves, this new algorithm improves on the bit complexity of previous methods by a "soft-Oh" factor of $T$, $\log D$, or $\log q$.
[ { "created": "Sun, 19 Jan 2014 21:51:32 GMT", "version": "v1" }, { "created": "Fri, 2 May 2014 14:31:31 GMT", "version": "v2" } ]
2014-05-05
[ [ "Arnold", "Andrew", "" ], [ "Giesbrecht", "Mark", "" ], [ "Roche", "Daniel S.", "" ] ]
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1401.4746
Yassin Chaffi
Y. Chaffi, R. Casta, L. Brenig
Effect of the fluctuations around mean field for N-body systems with long range interactions
14 pages
null
null
null
physics.class-ph cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the effect of Chandrasekhar and Holstmark's distribution of field fluctuations on the dynamics of N-body systems interacting via Coulomb or Newton gravitational force. We develop an approach based on statistical dynamics first principles whose mathematical framework is similar to the one used by Chandrasekhar and Holstmark for their field fluctuation theory. We use the Picard iteration method to approximate the Hamiltonian dynamics in the short time limit. Neglecting correlations between particles, carrying the thermodynamic limit and assuming that the system is spatially homogeneous, we find a fractional kinetic equation for the velocity distribution. Both, the fractional derivative order and the asymptotic behavior of the solution appear to be directly connected to the $1/r^2$ behavior of the Coulombian or gravitational interaction force over short distances.
[ { "created": "Sun, 19 Jan 2014 21:57:53 GMT", "version": "v1" } ]
2014-01-21
[ [ "Chaffi", "Y.", "" ], [ "Casta", "R.", "" ], [ "Brenig", "L.", "" ] ]
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1401.4747
Costantino Sigismondi
Costantino Sigismondi
Ipotesi astronomiche sul foro della colonna augustea di Santa Maria in Aracoeli
8 pages, 5 color figures, in Italian. To appear in Gerbertus vol. 5 (2014)
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physics.hist-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The third column of the left row in the Basilica of Santa Maria in Aracoeli in Rome, has a hole carved in it, of probable astronomical use. The tube aims at a point a 116 degrees of azimut, East-South-East and 17.3 degrees of altitude, the Sun could be aimed in that direction at 07:00 UTC of 12 october and 7:25 UT of march 2, but the view is obstructed by the church's building. Same situation for the 3.9 magnitude alpha Monocerotis, visible 2000 years ago, taking into account the precession. Other hypotheses on the meridian astronomical use of this hole are here reviewed. In the case of solar observations it cannot be for meridian transits in Rome, since the lower transits occurs now at 24.5 degrees at winter solstice; we investigate the case of stellar transits, of declination 30.8 degrees South. Many alignments are possible leaving the azimut as free parameter, being the columun not in its original collocation, but here we investigate only the meridian transits, and no bright stars could have been seen through that hole, taking also into account the precession 2000 years ago. We conclude that this hole was probably not used for meridian observations.
[ { "created": "Sun, 19 Jan 2014 22:23:22 GMT", "version": "v1" } ]
2014-01-21
[ [ "Sigismondi", "Costantino", "" ] ]
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1401.4750
Yaoqing Yang
Yaoqing Yang, Bo Bai, Wei Chen
How Much Frequency Can Be Reused in 5G Cellular Networks---A Matrix Graph Model
12 pages
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The 5th Generation cellular network may have the key feature of smaller cell size and denser resource employment, resulted from diminishing resource and increasing communication demands. However, small cell may result in high interference between cells. Moreover, the random geographic patterns of small cell networks make them hard to analyze, at least excluding schemes in the well-accepted hexagonal grid model. In this paper, a new model---the matrix graph is proposed which takes advantage of the small cell size and high inter-cell interference to reduce computation complexity. This model can simulate real world networks accurately and offers convenience in frequency allocation problems which are usually NP-complete. An algorithm dealing with this model is also given, which asymptotically achieves the theoretical limit of frequency allocation, and has a complexity which decreases with cell size and grows linearly with the network size. This new model is specifically proposed to characterize the next-generation cellular networks.
[ { "created": "Sun, 19 Jan 2014 22:42:47 GMT", "version": "v1" }, { "created": "Mon, 3 Feb 2014 05:32:40 GMT", "version": "v2" }, { "created": "Fri, 11 Apr 2014 20:47:33 GMT", "version": "v3" } ]
2014-04-15
[ [ "Yang", "Yaoqing", "" ], [ "Bai", "Bo", "" ], [ "Chen", "Wei", "" ] ]
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1401.4753
Rodrigo de Lamare
K. Zu, R. C. de Lamare and M. Haardt
Multi-Branch Tomlinson-Harashima Precoding for MU-MIMO Systems: Theory and Algorithms
13 figures, 12 pages. IEEE Transactions on Communications, 2014
null
10.1109/TCOMM.2014.012514.130241
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Tomlinson-Harashima precoding (THP) is a nonlinear processing technique employed at the transmit side and is a dual to the successive interference cancelation (SIC) detection at the receive side. Like SIC detection, the performance of THP strongly depends on the ordering of the precoded symbols. The optimal ordering algorithm, however, is impractical for multiuser MIMO (MU-MIMO) systems with multiple receive antennas due to the fact that the users are geographically distributed. In this paper, we propose a multi-branch THP (MB-THP) scheme and algorithms that employ multiple transmit processing and ordering strategies along with a selection scheme to mitigate interference in MU-MIMO systems. Two types of multi-branch THP (MB-THP) structures are proposed. The first one employs a decentralized strategy with diagonal weighted filters at the receivers of the users and the second uses a diagonal weighted filter at the transmitter. The MB-MMSE-THP algorithms are also derived based on an extended system model with the aid of an LQ decomposition, which is much simpler compared to the conventional MMSE-THP algorithms. Simulation results show that a better bit error rate (BER) performance can be achieved by the proposed MB-MMSE-THP precoder with a small computational complexity increase.
[ { "created": "Sun, 19 Jan 2014 23:08:35 GMT", "version": "v1" } ]
2016-11-15
[ [ "Zu", "K.", "" ], [ "de Lamare", "R. C.", "" ], [ "Haardt", "M.", "" ] ]
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1401.4768
Chi Xiong
Chi Xiong, Wolfram H. P. Pernice, and Hong X. Tang
Low-loss, silicon integrated, aluminum nitride photonic circuits and their use for electro-optic signal processing
null
Nano Letters 12 (7), 3562-3568 (2012)
10.1021/nl3011885
null
physics.optics cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Photonic miniaturization requires seamless integration of linear and nonlinear optical components to achieve passive and active functions simultaneously. Among the available material systems, silicon photonics holds immense promise for optical signal processing and on-chip optical networks. However, silicon is limited to wavelengths above 1100 nm and does not provide the desired lowest order optical nonlinearity for active signal processing. Here we report the integration of aluminum nitride (AlN) films on silicon substrates to bring active functionalities to chip-scale photonics. Using CMOS-compatible sputtered thin films we fabricate AlN-on-insulator waveguides that exhibit low propagation loss (0.6 dB/cm). Exploiting AlN's inherent Pockels effect we demonstrate electro-optic modulation up to 4.5 Gb/s with very low energy consumption (down to 10 fJ/bit). The ultra-wide transparency window of AlN devices also enables high speed modulation at visible wavelengths. Our low cost, wideband, carrier-free photonic circuits hold promise for ultra-low power and high speed signal processing at the microprocessor chip level.
[ { "created": "Mon, 20 Jan 2014 01:54:56 GMT", "version": "v1" } ]
2014-01-21
[ [ "Xiong", "Chi", "" ], [ "Pernice", "Wolfram H. P.", "" ], [ "Tang", "Hong X.", "" ] ]
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1401.4770
Omer Tamuz
Elchanan Mossel and Omer Tamuz
Opinion Exchange Dynamics
62 pages. arXiv admin note: substantial text overlap with arXiv:1207.5893
Probab. Surveys 14 (2017), 155--204
10.1214/14-PS230
null
math.PR cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We survey a range of models of opinion exchange. From the introduction: "The exchange of opinions between individuals is a fundamental social interaction... Moreover, many models in this field are an excellent playground for mathematicians, especially those working in probability, algorithms and combinatorics. The goal of this survey is to introduce such models to mathematicians, and especially to those working in discrete mathematics, information theory, optimization, probability and statistics."
[ { "created": "Mon, 20 Jan 2014 02:16:27 GMT", "version": "v1" }, { "created": "Wed, 29 Mar 2017 05:09:53 GMT", "version": "v2" } ]
2017-07-11
[ [ "Mossel", "Elchanan", "" ], [ "Tamuz", "Omer", "" ] ]
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1401.4773
Chi Xiong
W. H. P. Pernice, Chi Xiong and H. X. Tang
Photonic crystal dumbbell resonators in silicon and aluminum nitride integrated optical circuits
null
Journal of Nanophotonics 7 (1), 073095-073095 (2013)
10.1117/1.JNP.7.073095
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Tight confinement of light in photonic cavities provides an efficient template for the realization of high optical intensity with strong field gradients. Here we present such a nanoscale resonator device based on a one-dimensional photonic crystal slot cavity. Our design allows for realizing highly localized optical modes with theoretically predicted Q factors in excess of 106. The design is demonstrated experimentally both in a high-contrast refractive index system (silicon), as well as in medium refractive index contrast devices made from aluminum nitride. We achieve extinction ratio of 21dB in critically coupled resonators using an on-chip readout platform with loaded Q factors up to 33,000. Our approach holds promise for realizing ultra-small opto-mechanical resonators for high-frequency operation and sensing applications.
[ { "created": "Mon, 20 Jan 2014 02:23:46 GMT", "version": "v1" } ]
2014-02-25
[ [ "Pernice", "W. H. P.", "" ], [ "Xiong", "Chi", "" ], [ "Tang", "H. X.", "" ] ]
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1401.4776
Francis Robicheaux
F. Robicheaux and N. M. Gill
The effect of random positions for dipole hopping through a Rydberg gas
null
Phys. Rev. A 89, 053429 (2014)
10.1103/PhysRevA.89.053429
null
physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We calculate the effect of two kinds of randomness on the hopping of an excitation through a nearly regular Rydberg gas. We present calculations for how fast the excitation can hop away from its starting position for different dimensional lattices and for different levels of randomness. We also examine the asymptotic in time final position of the excitation to determine whether or not the excitation can be localized. The one dimensional system is an example of Anderson localization where the randomness is in the off-diagonal elements although the long-range nature of the interaction leads to non-exponential decay with distance. The two dimensional square lattice shows a mixture of extended and localized states for large randomness while there is no visible sign of localized states for weak randomness. The three dimensional cubic lattice has few localized states even for strong randomness.
[ { "created": "Mon, 20 Jan 2014 02:45:43 GMT", "version": "v1" } ]
2014-06-02
[ [ "Robicheaux", "F.", "" ], [ "Gill", "N. M.", "" ] ]
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1401.4777
Roland Bouffanais
Mohammad Komareji and Roland Bouffanais
Controllability of a swarm of topologically interacting autonomous agents
9 pages, 3 figures. arXiv admin note: text overlap with arXiv:1401.2598
Int. J. Complex Systems in Science, 3 (2013) 11-19
null
null
physics.bio-ph nlin.AO physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Controllability of complex networks has been the focal point of many recent studies in the field of complexity. These landmark advances shed a new light on the dynamics of natural and technological complex systems. Here, we analyze the controllability of a swarm of autonomous self-propelled agents having a topological neighborhood of interactions, applying the analytical tools developed for the study of the controllability of arbitrary complex directed networks. To this aim we thoroughly investigate the structural properties of the swarm signaling network which is the information transfer channel underpinning the dynamics of agents in the physical space. Our results show that with 6 or 7 topological neighbors, every agent not only affects, but is also affected by all other agents within the group. More importantly, still with 6 or 7 topological neighbors, each agent is capable of full control over all other agents. This finding is yet another argument justifying the particular value of the number of topological neighbors observed in field observations with flocks of starlings.
[ { "created": "Mon, 20 Jan 2014 02:52:50 GMT", "version": "v1" } ]
2022-09-29
[ [ "Komareji", "Mohammad", "" ], [ "Bouffanais", "Roland", "" ] ]
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1401.4780
Ji Liu
Ji Liu and Stephen J. Wright and Srikrishna Sridhar
An Asynchronous Parallel Randomized Kaczmarz Algorithm
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null
null
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math.NA cs.NA math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe an asynchronous parallel variant of the randomized Kaczmarz (RK) algorithm for solving the linear system $Ax=b$. The analysis shows linear convergence and indicates that nearly linear speedup can be expected if the number of processors is bounded by a multiple of the number of rows in $A$.
[ { "created": "Mon, 20 Jan 2014 03:06:43 GMT", "version": "v1" }, { "created": "Sat, 7 Jun 2014 16:33:39 GMT", "version": "v2" } ]
2014-06-10
[ [ "Liu", "Ji", "" ], [ "Wright", "Stephen J.", "" ], [ "Sridhar", "Srikrishna", "" ] ]
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1401.4786
Abhishek Gupta
Abhishek Gupta, Ashutosh Nayyar, Cedric Langbort, Tamer Basar
Common Information based Markov Perfect Equilibria for Linear-Gaussian Games with Asymmetric Information
Submitted to SIAM Journal of Control and Optimization
null
null
null
cs.SY cs.GT math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a class of two-player dynamic stochastic nonzero-sum games where the state transition and observation equations are linear, and the primitive random variables are Gaussian. Each controller acquires possibly different dynamic information about the state process and the other controller's past actions and observations. This leads to a dynamic game of asymmetric information among the controllers. Building on our earlier work on finite games with asymmetric information, we devise an algorithm to compute a Nash equilibrium by using the common information among the controllers. We call such equilibria common information based Markov perfect equilibria of the game, which can be viewed as a refinement of Nash equilibrium in games with asymmetric information. If the players' cost functions are quadratic, then we show that under certain conditions a unique common information based Markov perfect equilibrium exists. Furthermore, this equilibrium can be computed by solving a sequence of linear equations. We also show through an example that there could be other Nash equilibria in a game of asymmetric information, not corresponding to common information based Markov perfect equilibria.
[ { "created": "Mon, 20 Jan 2014 03:46:25 GMT", "version": "v1" } ]
2014-01-21
[ [ "Gupta", "Abhishek", "" ], [ "Nayyar", "Ashutosh", "" ], [ "Langbort", "Cedric", "" ], [ "Basar", "Tamer", "" ] ]
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1401.4788
Frank Nielsen
Frank Nielsen
Generalized Bhattacharyya and Chernoff upper bounds on Bayes error using quasi-arithmetic means
22 pages, include R code. To appear in Pattern Recognition Letters
Pattern Recognition Letters 42 (2014): 25-34
10.1016/j.patrec.2014.01.002
null
cs.CV cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Bayesian classification labels observations based on given prior information, namely class-a priori and class-conditional probabilities. Bayes' risk is the minimum expected classification cost that is achieved by the Bayes' test, the optimal decision rule. When no cost incurs for correct classification and unit cost is charged for misclassification, Bayes' test reduces to the maximum a posteriori decision rule, and Bayes risk simplifies to Bayes' error, the probability of error. Since calculating this probability of error is often intractable, several techniques have been devised to bound it with closed-form formula, introducing thereby measures of similarity and divergence between distributions like the Bhattacharyya coefficient and its associated Bhattacharyya distance. The Bhattacharyya upper bound can further be tightened using the Chernoff information that relies on the notion of best error exponent. In this paper, we first express Bayes' risk using the total variation distance on scaled distributions. We then elucidate and extend the Bhattacharyya and the Chernoff upper bound mechanisms using generalized weighted means. We provide as a byproduct novel notions of statistical divergences and affinity coefficients. We illustrate our technique by deriving new upper bounds for the univariate Cauchy and the multivariate $t$-distributions, and show experimentally that those bounds are not too distant to the computationally intractable Bayes' error.
[ { "created": "Mon, 20 Jan 2014 04:05:27 GMT", "version": "v1" } ]
2023-03-07
[ [ "Nielsen", "Frank", "" ] ]
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1401.4790
Dheerendra Mishra Mr.
Dheerendra Mishra
Cryptanalysis of Multi-Server Authenticated Key Agreement Scheme Based on Trust Computing Using Smart Cards and Biometrics
null
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Advancement in communication technology provides a scalable platform for various services where a remote user can access the server from anywhere without moving from its place. It has provided a unique opportunity for online services, such that the user need not physically present at the service center. These services adopt authentication and key agreement protocols to ensure authorized and secure access to resources. Most of the authentication schemes support single server environment where the user has to register with each server. If a user wishes to access multiple application servers, he requires to register with each of the servers. Although multi-server authentication schemes introduced a scalable platform such that a user can interact with any server using single registration. Recently, Chuang and Chen proposed an efficient multi-server authenticated key agreement scheme based on smart cards along with password and biometrics. This is a lightweight authentication scheme which requires the computation of only hash function. In this article, we present a brief review of Chuang and Chen's scheme. We analyze Chuang and Chen's scheme and identify that their scheme does not resist stolen smart card attack which causes the user's impersonation attack, server spoofing attack and man-in-the middle attack. Additionally, we show that their scheme has a weak key agreement protocol, which does not ensure forward secrecy.
[ { "created": "Mon, 20 Jan 2014 04:29:25 GMT", "version": "v1" } ]
2014-01-21
[ [ "Mishra", "Dheerendra", "" ] ]
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1401.4795
Tuen Wai Ng
Wai-Shun Cheung and Tuen-Wai Ng
A Three-Dimensional Voting System in Hong Kong
null
null
null
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The voting system in the Legislative Council of Hong Kong (Legco) is sometimes unicameral and sometimes bicameral, depending on whether the bill is proposed by the Hong Kong government. Therefore, although without any representative within Legco, the Hong Kong government has certain degree of legislative power --- as if there is a virtual representative of the Hong Kong government within the Legco. By introducing such a virtual representative of the Hong Kong government, we show that Legco is a three-dimensional voting system. We also calculate two power indices of the Hong Kong government through this virtual representative and consider the $C$-dimension and the $W$-dimension of Legco. Finally, some implications of this Legco model to the current constitutional reform in Hong Kong will be given.
[ { "created": "Mon, 20 Jan 2014 05:58:50 GMT", "version": "v1" } ]
2014-01-21
[ [ "Cheung", "Wai-Shun", "" ], [ "Ng", "Tuen-Wai", "" ] ]
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1401.4798
Chi Xiong
Chi Xiong, Wolfram Pernice, Kevin K. Ryu, Carsten Schuck, King Y. Fong, Tomas Palacios and Hong X. Tang
Integrated GaN photonic circuits on silicon (100) for second harmonic generation
null
Optics Express, Vol. 19, Issue 11, pp. 10462-10470 (2011)
10.1364/OE.19.010462
null
physics.optics cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate second order optical nonlinearity in a silicon architecture through heterogeneous integration of single-crystalline gallium nitride (GaN) on silicon (100) substrates. By engineering GaN microrings for dual resonance around 1560 nm and 780 nm, we achieve efficient, tunable second harmonic generation at 780 nm. The \{chi}(2) nonlinear susceptibility is measured to be as high as 16 plus minus 7 pm/V. Because GaN has a wideband transparency window covering ultraviolet, visible and infrared wavelengths, our platform provides a viable route for the on-chip generation of optical wavelengths in both the far infrared and near-UV through a combination of \{chi}(2) enabled sum-/difference-frequency processes.
[ { "created": "Mon, 20 Jan 2014 06:10:38 GMT", "version": "v1" } ]
2014-01-21
[ [ "Xiong", "Chi", "" ], [ "Pernice", "Wolfram", "" ], [ "Ryu", "Kevin K.", "" ], [ "Schuck", "Carsten", "" ], [ "Fong", "King Y.", "" ], [ "Palacios", "Tomas", "" ], [ "Tang", "Hong X.", "" ] ]
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1401.4799
Rami Cohen
Rami Cohen and Yuval Cassuto
LDPC Codes for Partial-Erasure Channels in Multi-Level Memories
7 pages, 3 figures. Partial version was submitted to ISIT 2014
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null
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cs.IT math.IT
http://creativecommons.org/licenses/by-nc-sa/3.0/
In this paper, we develop a new channel model, which we name the $q$-ary partial erasure channel (QPEC). QPEC has a $q$-ary input, and its output is either one symbol or a set of $M$ possible values. This channel mimics situations when current/voltage levels in measurement channels are only partially known, due to high read rates or imperfect current/voltage sensing. Our investigation is concentrated on the performance of low-density parity-pheck (LDPC) codes when used over this channel, due to their low decoding complexity with iterative-decoding algorithms. We give the density evolution equations of this channel, and develop its decoding-threshold analysis. Part of the analysis shows that finding the exact decoding threshold efficiently lies upon a solution to an open problem in additive combinatorics. For this part we give bounds and approximations.
[ { "created": "Mon, 20 Jan 2014 06:26:35 GMT", "version": "v1" }, { "created": "Thu, 23 Jan 2014 11:46:38 GMT", "version": "v2" }, { "created": "Tue, 4 Feb 2014 11:23:36 GMT", "version": "v3" }, { "created": "Wed, 12 Feb 2014 11:08:51 GMT", "version": "v4" } ]
2014-02-13
[ [ "Cohen", "Rami", "" ], [ "Cassuto", "Yuval", "" ] ]
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1401.4800
Chi Xiong
Chi Xiong, Wolfram H.P. Pernice, Mo Li and Hong X. Tang
High performance nanophotonic circuits based on partially buried horizontal slot waveguides
null
Optics Express, Vol. 18, Issue 20, pp. 20690-20698 (2010)
10.1364/OE.18.020690
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a novel platform to construct high-performance nanophotonic devices in low refractive index dielectric films at telecoms wavelengths. The formation of horizontal slots by PECVD deposition of high index amorphous silicon provides a convenient and low-cost way to tailor nanophotonic devices to application needs. Low propagation loss of less than 2 dB/cm is obtained allowing us to fabricate optical resonators with measured high optical quality factors exceeding 10^5. We design and experimentally demonstrate on-chip grating couplers to efficiently couple light into integrated circuitry with coupling loss of 4 dB and optical bandwidth exceeding 110 nm. The entire on-chip circuitry consisting of input/output couplers, Mach-Zehnder interferometers with high extinction ratio and ring, racetrack resonators are designed, fabricated and characterized.
[ { "created": "Mon, 20 Jan 2014 06:29:56 GMT", "version": "v1" } ]
2014-01-21
[ [ "Xiong", "Chi", "" ], [ "Pernice", "Wolfram H. P.", "" ], [ "Li", "Mo", "" ], [ "Tang", "Hong X.", "" ] ]
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1401.4802
J\"urgen M\"unch
Alexis Ocampo, J\"urgen M\"unch
Process Evolution Supported by Rationale: An Empirical Investigation of Process Changes
8 pages. The final publication is available at http://link.springer.com/chapter/10.1007%2F11754305_36
Software Process Change, volume 3966 of Lecture Notes in Computer Science, pages 334-341, Springer Berlin Heidelberg, 2006
10.1007/11754305_36
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Evolving a software process model without a retrospective and, in consequence, without an understanding of the process evolution, can lead to severe problems for the software development organization, e.g., inefficient performance as a consequence of the arbitrary introduction of changes or difficulty in demonstrating compliance to a given standard. Capturing information on the rationale behind changes can provide a means for better understanding process evolution. This article presents the results of an exploratory study with the goal of understanding the nature of process changes in a given context. It presents the most important issues that motivated process engineers changing important aerospace software process standards during an industrial project. The study is part of research work intended to incrementally define a systematic mechanism for process evolution supported by rationale information.
[ { "created": "Mon, 20 Jan 2014 06:41:59 GMT", "version": "v1" } ]
2014-01-21
[ [ "Ocampo", "Alexis", "" ], [ "Münch", "Jürgen", "" ] ]
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1401.4803
Hiroshi Kori
Hiroshi Kori, Yoshiki Kuramoto, Swati Jain, Istv\'an Z. Kiss, John Hudson
Clustering in Globally Coupled Oscillators Near a Hopf Bifurcation: Theory and Experiments
15 pages, 5 figures
Phys. Rev. E 89, 062906 (2014)
10.1103/PhysRevE.89.062906
null
nlin.AO cond-mat.dis-nn physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A theoretical analysis is presented to show the general occurrence of phase clusters in weakly, globally coupled oscillators close to a Hopf bifurcation. Through a reductive perturbation method, we derive the amplitude equation with a higher order correction term valid near a Hopf bifurcation point. This amplitude equation allows us to calculate analytically the phase coupling function from given limit-cycle oscillator models. Moreover, using the phase coupling function, the stability of phase clusters can be analyzed. We demonstrate our theory with the Brusselator model. Experiments are carried out to confirm the presence of phase clusters close to Hopf bifurcations with electrochemical oscillators.
[ { "created": "Mon, 20 Jan 2014 06:48:20 GMT", "version": "v1" }, { "created": "Sun, 13 Apr 2014 06:35:21 GMT", "version": "v2" }, { "created": "Tue, 16 Sep 2014 11:15:53 GMT", "version": "v3" } ]
2014-09-17
[ [ "Kori", "Hiroshi", "" ], [ "Kuramoto", "Yoshiki", "" ], [ "Jain", "Swati", "" ], [ "Kiss", "István Z.", "" ], [ "Hudson", "John", "" ] ]
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1401.4804
Walter Pettus
DM-Ice Collaboration: J. Cherwinka, D. Grant, F. Halzen, K. M. Heeger, L. Hsu, A. J. F. Hubbard, A. Karle, M. Kauer, V. A. Kudryavtsev, C. Macdonald, R. H. Maruyama, S. Paling, W. Pettus, Z. P. Pierpoint, B. N. Reilly, M. Robinson, P. Sandstrom, N. J. C. Spooner, S. Telfer, L. Yang
First data from DM-Ice17
matches PRD published version
Phys. Rev. D 90, 092005 (2014)
10.1103/PhysRevD.90.092005
null
astro-ph.IM astro-ph.CO hep-ex physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report the first analysis of background data from DM-Ice17, a direct-detection dark matter experiment consisting of 17 kg of NaI(Tl) target material. It was codeployed with IceCube 2457 m deep in the South Pole glacial ice in December 2010 and is the first such detector operating in the Southern Hemisphere. The background rate in the 6.5 - 8.0 keVee region is measured to be 7.9 +/- 0.4 counts/day/keV/kg. This is consistent with the expected background from the detector assemblies with negligible contributions from the surrounding ice. The successful deployment and operation of DM-Ice17 establishes the South Pole ice as a viable location for future underground, low-background experiments in the Southern Hemisphere. The detector assembly and deployment are described here, as well as the analysis of the DM-Ice17 backgrounds based on data from the first two years of operation after commissioning, July 2011 - June 2013.
[ { "created": "Mon, 20 Jan 2014 06:56:12 GMT", "version": "v1" }, { "created": "Wed, 13 Aug 2014 19:50:46 GMT", "version": "v2" }, { "created": "Thu, 13 Nov 2014 20:39:43 GMT", "version": "v3" } ]
2014-11-14
[ [ "Ice Collaboration", "", "" ], [ "Cherwinka", "J.", "" ], [ "Grant", "D.", "" ], [ "Halzen", "F.", "" ], [ "Heeger", "K. M.", "" ], [ "Hsu", "L.", "" ], [ "Hubbard", "A. J. F.", "" ], [ "Karle", "A.", "" ], [ "Kauer", "M.", "" ], [ "Kudryavtsev", "V. A.", "" ], [ "Macdonald", "C.", "" ], [ "Maruyama", "R. H.", "" ], [ "Paling", "S.", "" ], [ "Pettus", "W.", "" ], [ "Pierpoint", "Z. P.", "" ], [ "Reilly", "B. N.", "" ], [ "Robinson", "M.", "" ], [ "Sandstrom", "P.", "" ], [ "Spooner", "N. J. C.", "" ], [ "Telfer", "S.", "" ], [ "Yang", "L.", "" ] ]
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1401.4808
J\"urgen M\"unch
Mart\'in Soto, J\"urgen M\"unch
Maintaining a Large Process Model Aligned with a Process Standard: An Industrial Example
12 pages. The final publication is available at http://link.springer.com/chapter/10.1007%2F978-3-540-75381-0_3
Software Process Improvement, volume 4764 of Lecture Notes in Computer Science, pages 19-30, Springer Berlin Heidelberg, 2007
10.1007/978-3-540-75381-0_3
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An essential characteristic of mature software and system development organizations is the definition and use of explicit process models. For a number of reasons, it can be valuable to produce new process models by tailoring existing process standards (such as the V-Modell XT). Both process models and standards evolve over time in order to integrate improvements or adapt the process models to context changes. An important challenge for a process engineering team is to keep tailored process models aligned over time with the standards originally used to produce them. This article presents an approach that supports the alignment of process standards evolving in parallel to derived process models, using an actual industrial example to illustrate the problems and potential solutions. We present and discuss the results of a quantitative analysis done to determine whether a strongly tailored model can still be aligned with its parent standard and to assess the potential cost of such an alignment. We close the paper with conclusions and outlook.
[ { "created": "Mon, 20 Jan 2014 07:16:25 GMT", "version": "v1" } ]
2014-01-21
[ [ "Soto", "Martín", "" ], [ "Münch", "Jürgen", "" ] ]
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1401.4809
Lukas Einkemmer
Lukas Einkemmer and Alexander Ostermann
A strategy to suppress recurrence in grid-based Vlasov solvers
null
Eur. Phys. J. D (2014) 68: 197
10.1140/epjd/e2014-50058-x
null
physics.comp-ph math.NA physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we propose a strategy to suppress the recurrence effect present in grid-based Vlasov solvers. This method is formulated by introducing a cutoff frequency in Fourier space. Since this cutoff only has to be performed after a number of time steps, the scheme can be implemented efficiently and can relatively easily be incorporated into existing Vlasov solvers. Furthermore, the scheme proposed retains the advantage of grid-based methods in that high accuracy can be achieved. This is due to the fact that in contrast to the scheme proposed by Abbasi et al. no statistical noise is introduced into the simulation. We will illustrate the utility of the method proposed by performing a number of numerical simulations, including the plasma echo phenomenon, using a discontinuous Galerkin approximation in space and a Strang splitting based time integration.
[ { "created": "Mon, 20 Jan 2014 07:23:30 GMT", "version": "v1" } ]
2017-01-06
[ [ "Einkemmer", "Lukas", "" ], [ "Ostermann", "Alexander", "" ] ]
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1401.4821
J\"urgen M\"unch
Mart\'in Soto, J\"urgen M\"unch
Process Model Difference Analysis for Supporting Process Evolution
12 pages. The final publication is available at http://link.springer.com/chapter/10.1007%2F11908562_12
Software Process Improvement, volume 4257 of Lecture Notes in Computer Science, pages 123-134, Springer Berlin Heidelberg, 2006
10.1007/11908562_12
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Software development processes are subject to variations in time and space, variations that can originate from learning effects, differences in application domains, or a number of other causes. Identifying and analyzing such differences is crucial for a variety of process activities, like defining and evolving process standards, or analyzing the compliance of process models to existing standards, among others. In this paper, we show why appropriately identifying, describing, and visualizing differences between process models in order to support such activities is a highly challenging task. We present scenarios that motivate the need for process model difference analysis, and describe the conceptual and technical challenges arising from them. In addition, we sketch an initial tool-based approach implementing difference analysis, and contrast it with similar existing approaches. The results from this paper constitute the requirements for our ongoing development effort, whose objectives we also describe briefly.
[ { "created": "Mon, 20 Jan 2014 08:39:35 GMT", "version": "v1" } ]
2014-01-21
[ [ "Soto", "Martín", "" ], [ "Münch", "Jürgen", "" ] ]
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1401.4823
Matthew Wing
AWAKE Collaboration: R. Assmann, R. Bingham, T. Bohl, C. Bracco, B. Buttenschon, A. Butterworth, A. Caldwell, S. Chattopadhyay, S. Cipiccia, E. Feldbaumer, R.A. Fonseca, B. Goddard, M. Gross, O. Grulke, E. Gschwendtner, J. Holloway, C. Huang, D. Jaroszynski, S. Jolly, P. Kempkes, N. Lopes, K. Lotov, J. Machacek, S.R. Mandry, J.W. McKenzie, M. Meddahi, B.L. Militsyn, N. Moschuering, P. Muggli, Z. Najmudin, T.C.Q. Noakes, P.A. Norreys, E. Oz, A. Pardons, A. Petrenko, A. Pukhov, K. Rieger, O. Reimann, H. Ruhl, E. Shaposhnikova, L.O. Silva, A. Sosedkin, R. Tarkeshian, R.M.G.N. Trines, T. Tuckmantel, J. Vieira, H. Vincke, M. Wing, G. Xia
Proton-driven plasma wakefield acceleration: a path to the future of high-energy particle physics
12 pages, 5 figures, submitted to Plasma Phys. Control. Fusion special edition for LPAW 2013. Small updates after comments from Journal referees
null
null
null
physics.acc-ph hep-ex physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
New acceleration technology is mandatory for the future elucidation of fundamental particles and their interactions. A promising approach is to exploit the properties of plasmas. Past research has focused on creating large-amplitude plasma waves by injecting an intense laser pulse or an electron bunch into the plasma. However, the maximum energy gain of electrons accelerated in a single plasma stage is limited by the energy of the driver. Proton bunches are the most promising drivers of wakefields to accelerate electrons to the TeV energy scale in a single stage. An experimental program at CERN -- the AWAKE experiment -- has been launched to study in detail the important physical processes and to demonstrate the power of proton-driven plasma wakefield acceleration. Here we review the physical principles and some experimental considerations for a future proton-driven plasma wakefield accelerator.
[ { "created": "Mon, 20 Jan 2014 08:45:16 GMT", "version": "v1" }, { "created": "Wed, 2 Apr 2014 09:11:54 GMT", "version": "v2" } ]
2014-04-03
[ [ "AWAKE Collaboration", "", "" ], [ "Assmann", "R.", "" ], [ "Bingham", "R.", "" ], [ "Bohl", "T.", "" ], [ "Bracco", "C.", "" ], [ "Buttenschon", "B.", "" ], [ "Butterworth", "A.", "" ], [ "Caldwell", "A.", "" ], [ "Chattopadhyay", "S.", "" ], [ "Cipiccia", "S.", "" ], [ "Feldbaumer", "E.", "" ], [ "Fonseca", "R. A.", "" ], [ "Goddard", "B.", "" ], [ "Gross", "M.", "" ], [ "Grulke", "O.", "" ], [ "Gschwendtner", "E.", "" ], [ "Holloway", "J.", "" ], [ "Huang", "C.", "" ], [ "Jaroszynski", "D.", "" ], [ "Jolly", "S.", "" ], [ "Kempkes", "P.", "" ], [ "Lopes", "N.", "" ], [ "Lotov", "K.", "" ], [ "Machacek", "J.", "" ], [ "Mandry", "S. R.", "" ], [ "McKenzie", "J. W.", "" ], [ "Meddahi", "M.", "" ], [ "Militsyn", "B. L.", "" ], [ "Moschuering", "N.", "" ], [ "Muggli", "P.", "" ], [ "Najmudin", "Z.", "" ], [ "Noakes", "T. C. Q.", "" ], [ "Norreys", "P. A.", "" ], [ "Oz", "E.", "" ], [ "Pardons", "A.", "" ], [ "Petrenko", "A.", "" ], [ "Pukhov", "A.", "" ], [ "Rieger", "K.", "" ], [ "Reimann", "O.", "" ], [ "Ruhl", "H.", "" ], [ "Shaposhnikova", "E.", "" ], [ "Silva", "L. O.", "" ], [ "Sosedkin", "A.", "" ], [ "Tarkeshian", "R.", "" ], [ "Trines", "R. M. G. N.", "" ], [ "Tuckmantel", "T.", "" ], [ "Vieira", "J.", "" ], [ "Vincke", "H.", "" ], [ "Wing", "M.", "" ], [ "Xia", "G.", "" ] ]
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1401.4825
Erhu Zhang
Xiaobo Zhai, Shengli Zhang and Shumin Zhao
Conformation characters of gel sheets with rotational symmetry: the role of boundary
10 pages, 8 figures
null
null
null
physics.bio-ph cond-mat.soft
http://creativecommons.org/licenses/by-nc-sa/3.0/
In this paper, we systemically study the conformation characters of rotational symmetric gel sheets with free boundary and investigate the role of boundary on the equilibrium conformation. In gel sheet the boundary provides a residual strain which leads to re-distribution of stress and impacts the shape of equilibrium conformation accordingly. For sheet with boundary, the in-plane stretching energy is far larger than the bending energy in some cases. It is intrinsic different from closed membrane. In gel sheets, the boundary doesn't only quantitatively amend to the elastic energy. The residual strain on boundary cooperates with bending and stretching to determine the equilibrium conformation rather than just the last two factors. Furthermore, on the boundary of gel sheet, there is an additional energy induced by boundary line tension $\gamma $. If $\gamma =0$, there is $10\%$ difference of elastic energy from the experimental result. Finally, we discuss the effects of such line tension $\gamma $ and propose a way to measure it by the border radius. It redounds to study the physical origination of $\gamma $.
[ { "created": "Mon, 20 Jan 2014 08:54:50 GMT", "version": "v1" } ]
2014-01-21
[ [ "Zhai", "Xiaobo", "" ], [ "Zhang", "Shengli", "" ], [ "Zhao", "Shumin", "" ] ]
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1401.4831
Yi-Kai Wang
Yi-Kai Wang, Yitong Yin, Sheng Zhong
Approximate Capacities of Two-Dimensional Codes by Spatial Mixing
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null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We apply several state-of-the-art techniques developed in recent advances of counting algorithms and statistical physics to study the spatial mixing property of the two-dimensional codes arising from local hard (independent set) constraints, including: hard-square, hard-hexagon, read/write isolated memory (RWIM), and non-attacking kings (NAK). For these constraints, the strong spatial mixing would imply the existence of polynomial-time approximation scheme (PTAS) for computing the capacity. It was previously known for the hard-square constraint the existence of strong spatial mixing and PTAS. We show the existence of strong spatial mixing for hard-hexagon and RWIM constraints by establishing the strong spatial mixing along self-avoiding walks, and consequently we give PTAS for computing the capacities of these codes. We also show that for the NAK constraint, the strong spatial mixing does not hold along self-avoiding walks.
[ { "created": "Mon, 20 Jan 2014 09:14:04 GMT", "version": "v1" }, { "created": "Tue, 25 Feb 2014 10:31:57 GMT", "version": "v2" } ]
2014-02-26
[ [ "Wang", "Yi-Kai", "" ], [ "Yin", "Yitong", "" ], [ "Zhong", "Sheng", "" ] ]
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1401.4832
Magnus Ekeberg
Magnus Ekeberg, Tuomo Hartonen, Erik Aurell
Fast pseudolikelihood maximization for direct-coupling analysis of protein structure from many homologous amino-acid sequences
33 pages, 4 figures; M. Ekeberg and T. Hartonen are joint first authors; code and supplementary information on http://plmdca.csc.kth.se/
Journal of Computational Physics 276 (2014) 341-356
10.1016/j.jcp.2014.07.024
null
q-bio.QM physics.comp-ph physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Direct-Coupling Analysis is a group of methods to harvest information about coevolving residues in a protein family by learning a generative model in an exponential family from data. In protein families of realistic size, this learning can only be done approximately, and there is a trade-off between inference precision and computational speed. We here show that an earlier introduced $l_2$-regularized pseudolikelihood maximization method called plmDCA can be modified as to be easily parallelizable, as well as inherently faster on a single processor, at negligible difference in accuracy. We test the new incarnation of the method on 148 protein families from the Protein Families database (PFAM), one of the largest tests of this class of algorithms to date.
[ { "created": "Mon, 20 Jan 2014 09:15:01 GMT", "version": "v1" } ]
2014-09-16
[ [ "Ekeberg", "Magnus", "" ], [ "Hartonen", "Tuomo", "" ], [ "Aurell", "Erik", "" ] ]
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Fast pseudolikelihood maximization for direct-coupling analysis of protein structure from many homologous amino-acid sequences
http://arxiv.org/abs/1401.4832v1
http://arxiv.org/pdf/1401.4832v1.pdf
https://github.com/pagnani/PlmDCA
false
false
https://paperswithcode.com/paper/fast-pseudolikelihood-maximization-for-direct
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1401.4834
Amr Ismail Tammam
Amr Ismail and Mohamed-Slim Alouini
On Low-Complexity Full-diversity Detection In Multi-User MIMO Multiple-Access Channels
30 pages, 7 figures, submitted to the IEEE Transactions on Communications
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Multiple-input multiple-output (MIMO) techniques are becoming commonplace in recent wireless communication standards. This added dimension (i.e., space) can be efficiently used to mitigate the interference in the multi-user MIMO context. In this paper, we focus on the uplink of a MIMO multiple access channel (MAC) where perfect channel state information (CSI) is only available at the destination. We provide a new set of sufficient conditions for a wide range of space-time block codes (STBC)s to achieve full-diversity under \emph{partial interference cancellation group decoding} (PICGD) with or without successive interference cancellation (SIC) for completely blind users. Explicit interference cancellation (IC) schemes for two and three users are then provided and shown to satisfy the derived full-diversity criteria. Besides the complexity reduction due to the fact that the proposed IC schemes enable separate decoding of distinct users without sacrificing the diversity gain, further reduction of the decoding complexity may be obtained. In fact, thanks to the structure of the proposed schemes, the real and imaginary parts of each user's symbols may be decoupled without any loss of performance. Finally, our theoretical claims are corroborated by simulation results and the new IC scheme for two-user MIMO MAC is shown to outperform the recently proposed two-user IC scheme especially for high spectral efficiency while requiring significantly less decoding complexity.
[ { "created": "Mon, 20 Jan 2014 09:24:20 GMT", "version": "v1" }, { "created": "Fri, 20 Jun 2014 17:08:56 GMT", "version": "v2" } ]
2014-06-23
[ [ "Ismail", "Amr", "" ], [ "Alouini", "Mohamed-Slim", "" ] ]
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1401.4840
Tomasz Gogacz
Tomasz Gogacz and Jerzy Marcinkowski
Termination of oblivious chase is undecidable
null
null
null
null
cs.DB
http://creativecommons.org/licenses/by-nc-sa/3.0/
We show that all--instances termination of chase is undecidable. More precisely, there is no algorithm deciding, for a given set $\cal T$ consisting of Tuple Generating Dependencies (a.k.a. Datalog$^\exists$ program), whether the $\cal T$-chase on $D$ will terminate for every finite database instance $D$. Our method applies to Oblivious Chase, Semi-Oblivious Chase and -- after a slight modification -- also for Standard Chase. This means that we give a (negative) solution to the all--instances termination problem for all version of chase that are usually considered. The arity we need for our undecidability proof is three. We also show that the problem is EXPSPACE-hard for binary signatures, but decidability for this case is left open. Both the proofs -- for ternary and binary signatures -- are easy. Once you know them.
[ { "created": "Mon, 20 Jan 2014 09:43:59 GMT", "version": "v1" }, { "created": "Fri, 14 Feb 2014 07:39:31 GMT", "version": "v2" } ]
2015-12-08
[ [ "Gogacz", "Tomasz", "" ], [ "Marcinkowski", "Jerzy", "" ] ]
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1401.4844
Rosy Madaan
Ashish Kumar Mourya, Niraj Singhal
Managing Congestion Control in Mobile AD-HOC Network Using Mobile Agents
9 Pages. IJCEA, 2014. arXiv admin note: substantial text overlap with arXiv:0907.5441 by other authors without attribution
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In mobile adhoc networks, congestion occurs with limited resources. The standard TCP congestion control mechanism is not able to handle the special properties of a shared wireless channel. TCP congestion control works very well on the Internet. But mobile adhoc networks exhibit some unique properties that greatly affect the design of appropriate protocols and protocol stacks in general, and of congestion control mechanism in particular. As it turned out, the vastly differing environment in a mobile adhoc network is highly problematic for standard TCP. Many approaches have been proposed to overcome these difficulties. Mobile agent based congestion control Technique is proposed to avoid congestion in adhoc network. When mobile agent travels through the network, it can select a less-loaded neighbor node as its next hop and update the routing table according to the node congestion status. With the aid of mobile agents, the nodes can get the dynamic network topology in time. In this paper, a mobile agent based congestion control mechanism is presented.
[ { "created": "Mon, 20 Jan 2014 09:51:07 GMT", "version": "v1" } ]
2014-01-21
[ [ "Mourya", "Ashish Kumar", "" ], [ "Singhal", "Niraj", "" ] ]
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1401.4848
Ronald Hochreiter
Ronald Hochreiter and Christoph Waldhauser
An Evolutionary Approach towards Clustering Airborne Laser Scanning Data
null
Proceedings of MENDEL 2012: 7-12. 2012
null
null
cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In land surveying, the generation of maps was greatly simplified with the introduction of orthophotos and at a later stage with airborne LiDAR laser scanning systems. While the original purpose of LiDAR systems was to determine the altitude of ground elevations, newer full wave systems provide additional information that can be used on classifying the type of ground cover and the generation of maps. The LiDAR resulting point clouds are huge, multidimensional data sets that need to be grouped in classes of ground cover. We propose a genetic algorithm that aids in classifying these data sets and thus make them usable for map generation. A key feature are tailor-made genetic operators and fitness functions for the subject. The algorithm is compared to a traditional k-means clustering.
[ { "created": "Mon, 20 Jan 2014 10:22:41 GMT", "version": "v1" } ]
2014-01-21
[ [ "Hochreiter", "Ronald", "" ], [ "Waldhauser", "Christoph", "" ] ]
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1401.4849
Sebastien Bubeck
S\'ebastien Bubeck, Elchanan Mossel, Mikl\'os Z. R\'acz
On the influence of the seed graph in the preferential attachment model
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null
null
null
math.PR cs.DM cs.SI math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the influence of the seed graph in the preferential attachment model, focusing on the case of trees. We first show that the seed has no effect from a weak local limit point of view. On the other hand, we conjecture that different seeds lead to different distributions of limiting trees from a total variation point of view. We take a first step in proving this conjecture by showing that seeds with different degree profiles lead to different limiting distributions for the (appropriately normalized) maximum degree, implying that such seeds lead to different (in total variation) limiting trees.
[ { "created": "Mon, 20 Jan 2014 10:23:44 GMT", "version": "v1" }, { "created": "Fri, 7 Feb 2014 19:16:28 GMT", "version": "v2" }, { "created": "Fri, 28 Mar 2014 13:27:19 GMT", "version": "v3" } ]
2014-03-31
[ [ "Bubeck", "Sébastien", "" ], [ "Mossel", "Elchanan", "" ], [ "Rácz", "Miklós Z.", "" ] ]
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1401.4857
Ronald Hochreiter
Ronald Hochreiter and Christoph Waldhauser
A Genetic Algorithm to Optimize a Tweet for Retweetability
null
Proceedings of MENDEL 2013: 13-18. 2013
null
null
cs.NE cs.CY cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Twitter is a popular microblogging platform. When users send out messages, other users have the ability to forward these messages to their own subgraph. Most research focuses on increasing retweetability from a node's perspective. Here, we center on improving message style to increase the chance of a message being forwarded. To this end, we simulate an artificial Twitter-like network with nodes deciding deterministically on retweeting a message or not. A genetic algorithm is used to optimize message composition, so that the reach of a message is increased. When analyzing the algorithm's runtime behavior across a set of different node types, we find that the algorithm consistently succeeds in significantly improving the retweetability of a message.
[ { "created": "Mon, 20 Jan 2014 10:42:51 GMT", "version": "v1" } ]
2014-01-21
[ [ "Hochreiter", "Ronald", "" ], [ "Waldhauser", "Christoph", "" ] ]
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1401.4858
Scientific Information Service CERN
E. Todesco (ed.) (CERN)
Proceedings of the WAMSDO 2013 Workshop on Accelerator Magnet, Superconductor, Design and Optimization, CERN Geneva, Switzerland, 15 - 16 Jan 2013
12 lectures, 82 pages, published as CERN Yellow Report https://cds.cern.ch/record/1481283
null
10.5170/CERN-2013-006
CERN-2013-006
physics.acc-ph
http://creativecommons.org/licenses/by/3.0/
This report contains the proceedings of the Workshop on Accelerator Magnet Superconductor, Design and Optimization (WAMSDO) held at CERN from 15 to 16 January 2013. This fourth edition of the WAMSDO workshop is focussed on aspects related to quench protection.
[ { "created": "Mon, 20 Jan 2014 10:44:11 GMT", "version": "v1" } ]
2014-01-21
[ [ "Todesco", "E.", "", "ed." ] ]
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1401.4861
Federico Laudisa
Mauro Dorato and Federico Laudisa
Realism and instrumentalism about the wave function. How should we choose?
Forthcoming in Gao Shan (ed.) Protective Measurements and Quantum Reality: Toward a New Understanding of Quantum Mechanics, Cambridge University Press
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quant-ph physics.hist-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The main claim of the paper is that one can be 'realist' (in some sense) about quantum mechanics without requiring any form of realism about the wave function. We begin by discussing various forms of realism about the wave function, namely Albert's configuration-space realism, Duerr Zanghi and Goldstein's nomological realism about the wave function, Esfeld's dispositional reading of the wave function and Pusey Barrett and Rudolph's realism about the quantum state. By discussing the articulation of these four positions, and their interrelation, we conclude that instrumentalism about the wave function is by itself not sufficient to choose one over the other interpretations of quantum mechanics, thereby confirming in a different way the indetermination of the metaphysical interpretations of quantum mechanics.
[ { "created": "Mon, 20 Jan 2014 11:15:04 GMT", "version": "v1" } ]
2014-01-21
[ [ "Dorato", "Mauro", "" ], [ "Laudisa", "Federico", "" ] ]
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1401.4862
Vincenzo De Florio
Vincenzo De Florio
Antifragility = Elasticity + Resilience + Machine Learning: Models and Algorithms for Open System Fidelity
Preliminary version submitted to the 1st International Workshop "From Dependable to Resilient, from Resilient to Antifragile Ambients and Systems" (ANTIFRAGILE 2014), https://sites.google.com/site/resilience2antifragile/
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cs.OH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a model of the fidelity of open systems - fidelity being interpreted here as the compliance between corresponding figures of interest in two separate but communicating domains. A special case of fidelity is given by real-timeliness and synchrony, in which the figure of interest is the physical and the system's notion of time. Our model covers two orthogonal aspects of fidelity, the first one focusing on a system's steady state and the second one capturing that system's dynamic and behavioural characteristics. We discuss how the two aspects correspond respectively to elasticity and resilience and we highlight each aspect's qualities and limitations. Finally we sketch the elements of a new model coupling both of the first model's aspects and complementing them with machine learning. Finally, a conjecture is put forward that the new model may represent a first step towards compositional criteria for antifragile systems.
[ { "created": "Mon, 20 Jan 2014 11:19:32 GMT", "version": "v1" } ]
2014-01-21
[ [ "De Florio", "Vincenzo", "" ] ]
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1401.4864
Emilie Verheylewegen
Emilie Verheylewegen and \"Ozg\"ur Karatekin and Beno\^it Noyelles
Coupled orbital-thermal evolution of Miranda
20 pages, 6 figures
null
null
null
math.DS astro-ph.EP physics.geo-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Miranda has a unusually high inclination ($I=4.338^\circ$), and its surface reveals signs of past endogenic activity. Investigations of the dynamical aspects of its orbital evolution suggest probable resonant processes, in particular with Umbriel, as an explanation for the present high inclination of Miranda. The tidal heating induced by gravitational interactions can lead to the rise of eccentricities and, consequently, to the increased dissipation of energy inside the satellite and higher internal temperatures. We study here the possible increase in eccentricities caused by orbital resonances and the resulting endogenic heating on Miranda taking into account its temperature dependent rheology. The coupled orbital-thermal evolution model was run with different rheological models and the thermal parameters starting form a cold thermal state, in radiative equilibrium with the environment. For the nominal parameters of the evolution scenarios studied, the resonances were not sufficient to rise neither the eccentricities nor the internal temperatures significantly. Lowest dissipation function $Q$ of around 100 and final eccentricity of $e\approx0.02$ were obtained during the resonance 3:1 with Umbriel.
[ { "created": "Mon, 20 Jan 2014 11:37:00 GMT", "version": "v1" } ]
2014-01-21
[ [ "Verheylewegen", "Emilie", "" ], [ "Karatekin", "Özgür", "" ], [ "Noyelles", "Benoît", "" ] ]
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1401.4869
Taraka Rama Kasicheyanula
Taraka Rama, Karthik Gali, Avinesh PVS
Does Syntactic Knowledge help English-Hindi SMT?
null
null
null
null
cs.CL cs.AI
http://creativecommons.org/licenses/by/3.0/
In this paper we explore various parameter settings of the state-of-art Statistical Machine Translation system to improve the quality of the translation for a `distant' language pair like English-Hindi. We proposed new techniques for efficient reordering. A slight improvement over the baseline is reported using these techniques. We also show that a simple pre-processing step can improve the quality of the translation significantly.
[ { "created": "Mon, 20 Jan 2014 11:49:11 GMT", "version": "v1" } ]
2014-01-21
[ [ "Rama", "Taraka", "" ], [ "Gali", "Karthik", "" ], [ "PVS", "Avinesh", "" ] ]
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1401.4872
Ayman Bahaa-Eldin
Hany Nashat Gabra, Ayman Mohammad Bahaa-Eldin, Huda Korashy
Classification of IDS Alerts with Data Mining Techniques
2012 International Conference on Internet Study (NETs2012), Bangkok, Thailand
null
null
null
cs.CR cs.DB cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A data mining technique to reduce the amount of false alerts within an IDS system is proposed. The new technique achieves an accuracy of 99% compared to 97% by the current systems.
[ { "created": "Mon, 20 Jan 2014 11:58:23 GMT", "version": "v1" } ]
2014-01-21
[ [ "Gabra", "Hany Nashat", "" ], [ "Bahaa-Eldin", "Ayman Mohammad", "" ], [ "Korashy", "Huda", "" ] ]
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1401.4876
Ngo Khanh Tan Vu
Ngo Tan Vu Khanh
The critical factors affecting E-Government adoption: A Conceptual Framework in Vietnam
null
null
null
null
cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Electronic government (e-government) has established as an effective mechanism for increasing government productivity and efficiency and a key enabler of citizen- centric services. However, e-government implementation is surrounded by technological, governing and social issues, which have to be considered and treated carefully in order to facilitate this change. This research attempts to explore and investigate the key challenges that influence e-government implementation and the factors influencing citizen adoption in Vietnam. It develops a conceptual framework on the basis of existing experiences drawn from administrative reforms. Survey data from public employee will be used to test the proposed hypothesis and the model. Therefore, this research has identified factors that determine if the citizen will adopt E-government services and thereby aiding governments in accessing what is required to increase adoption. We will also highlight several research, practitioner and policy implications.
[ { "created": "Mon, 20 Jan 2014 12:31:21 GMT", "version": "v1" } ]
2014-01-21
[ [ "Khanh", "Ngo Tan Vu", "" ] ]
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1401.4879
Marcello Mamino
Marcello Mamino
On the Computing Power of $+$, $-$, and $\times$
11 pages, final version accepted by CSL-LICS 2014
null
null
null
cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Modify the Blum-Shub-Smale model of computation replacing the permitted computational primitives (the real field operations) with any finite set $B$ of real functions semialgebraic over the rationals. Consider the class of boolean decision problems that can be solved in polynomial time in the new model by machines with no machine constants. How does this class depend on $B$? We prove that it is always contained in the class obtained for $B = \{+, -, \times\}$. Moreover, if $B$ is a set of continuous semialgebraic functions containing $+$ and $-$, and such that arbitrarily small numbers can be computed using $B$, then we have the following dichotomy: either our class is $\mathsf P$ or it coincides with the class obtained for $B = \{+, -, \times\}$.
[ { "created": "Mon, 20 Jan 2014 12:54:33 GMT", "version": "v1" }, { "created": "Tue, 15 Apr 2014 19:28:32 GMT", "version": "v2" } ]
2014-04-16
[ [ "Mamino", "Marcello", "" ] ]
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1401.4882
Joe Smallman
I.J. Smallman, F. Wang, T.C. Steimle, M.R. Tarbutt, E.A. Hinds
Radiative Branching Ratios for Excited States of $^{174}$YbF: Application to Laser Cooling
5 pages
null
10.1016/j.jms.2014.02.006
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We excite YbF molecules to low-lying vibrational levels of the $A^2\Pi_{1/2}$ state, and of the nearby perturber state sometimes called [18.6]0.5. By dispersing the fluorescence, we measure branching ratios for the radiative decay to vibrational levels of the $X^2\Sigma^+$ state. These ratios help to determine the optimum laser cooling scheme for the molecule. Our results establish the practicality of a scheme that was previously suggested [Tarbutt et al., New J. Phys. 15 (2013) 053034] and show how the scheme can be modified to provide a stronger radiative cooling force.
[ { "created": "Mon, 20 Jan 2014 13:03:17 GMT", "version": "v1" }, { "created": "Tue, 11 Feb 2014 10:46:32 GMT", "version": "v2" } ]
2015-06-18
[ [ "Smallman", "I. J.", "" ], [ "Wang", "F.", "" ], [ "Steimle", "T. C.", "" ], [ "Tarbutt", "M. R.", "" ], [ "Hinds", "E. A.", "" ] ]
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1401.4890
Evgeny Gromov
E.M. Gromov, B.A. Malomed
Damped solitons in an extended nonlinear Schrodinger equation with a spatial stimulated Raman scattering and decreasing dispersion
13 pages, 6 figures, Optics Communications, in press. arXiv admin note: text overlap with arXiv:1306.4550
null
10.1016/j.optcom.2014.01.050
null
physics.optics nlin.PS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Dynamics of solitons is considered in the framework of an extended nonlinear Schrodinger equation (NLSE), which is derived from a system of the Zakharov's type for the interaction between high- and low-frequency (HF and LF) waves. The resulting NLSE includes a pseudo-stimulated-Raman-scattering (pseudo-SRS) term, i.e., a spatial-domain counterpart of the SRS term, which is a known ingredient of the temporal-domain NLSE in optics. Also included is inhomogeneity of the spatial second-order dispersion (SOD) and linear losses of HF waves. It is shown that wavenumber downshift by the pseudo-SRS may be compensated by upshift provided by SOD whose local strength is an exponentially decaying function of the coordinate. An analytical soliton solution with a permanent shape is found in an approximate form, and is verified by comparison with numerical results
[ { "created": "Mon, 20 Jan 2014 13:19:45 GMT", "version": "v1" } ]
2014-03-05
[ [ "Gromov", "E. M.", "" ], [ "Malomed", "B. A.", "" ] ]
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1401.4891
Ahmed Ben Achballah
Ahmed Ben Achballah and Slim Ben Saoud
The Design of a Network-On-Chip Architecture Based On An Avionic Protocol
5 pages World Symposium on Computer Applications & Research WSCAR' 2014, 18-20 January, Sousse, Tunisia
null
null
null
cs.AR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
When the Network-On-Chip (NoC) paradigm was introduced, many researchers have proposed many novelistic NoC architectures, tools and design strategies. In this paper we introduce a new approach in the field of designing Network-On-Chip (NoC). Our inspiration came from an avionic protocol which is the AFDX protocol. The proposed NoC architecture is a switch centric architecture, with exclusive shortcuts between hosts and utilizes the flexibility, the reliability and the performances offered by AFDX.
[ { "created": "Mon, 20 Jan 2014 13:20:58 GMT", "version": "v1" } ]
2014-01-21
[ [ "Achballah", "Ahmed Ben", "" ], [ "Saoud", "Slim Ben", "" ] ]
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1401.4897
Behcet Alpat
Behcet Alpat, Ercan Pilicer, Sandor Blasko, Diego Caraffini, Francesco Di Capua, Vasile Postolache, Giorgio Saltanocchi, Mauro Menichelli, Laurent Desorgher, Marco Durante, Radek Pleskac, Chiara La Tessa
Total and Partial Fragmentation Cross-Section of 500 MeV/nucleon Carbon Ions on Different Target Materials
10pages, 13figures, 4tables
IEEE TRANSACTIONS ON NUCLEAR SCIENCE, VOL. 60, NO. 6, DECEMBER 2013
10.1109/TNS.2013.2284855
null
physics.ins-det hep-ex nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
By using an experimental setup based on thin and thick double-sided microstrip silicon detectors, it has been possible to identify the fragmentation products due to the interaction of very high energy primary ions on different targets. Here we report total and partial cross-sections measured at GSI (Gesellschaft fur Schwerionenforschung), Darmstadt, for 500 MeV/n energy $^{12}C$ beam incident on water (in flasks), polyethylene, lucite, silicon carbide, graphite, aluminium, copper, iron, tin, tantalum and lead targets. The results are compared to the predictions of GEANT4 (v4.9.4) and FLUKA (v11.2) Monte Carlo simulation programs.
[ { "created": "Mon, 20 Jan 2014 13:38:11 GMT", "version": "v1" } ]
2014-01-21
[ [ "Alpat", "Behcet", "" ], [ "Pilicer", "Ercan", "" ], [ "Blasko", "Sandor", "" ], [ "Caraffini", "Diego", "" ], [ "Di Capua", "Francesco", "" ], [ "Postolache", "Vasile", "" ], [ "Saltanocchi", "Giorgio", "" ], [ "Menichelli", "Mauro", "" ], [ "Desorgher", "Laurent", "" ], [ "Durante", "Marco", "" ], [ "Pleskac", "Radek", "" ], [ "La Tessa", "Chiara", "" ] ]
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1401.4907
Saif Khan Mohammed Dr.
Saif Khan Mohammed
Impact of Transceiver Power Consumption on the Energy Efficiency of Zero-Forcing Detector in Massive MIMO Systems
To appear in IEEE Transactions on Communications (accepted, 13 October 2014)
null
10.1109/TCOMM.2014.2364188
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the impact of transceiver power consumption on the energy efficiency (EE) of the Zero Forcing (ZF) detector in the uplink of massive MIMO systems, where a base station (BS) with $M$ antennas communicates coherently with $K$ single antenna user terminals (UTs). We consider the problem of maximizing the EE with respect to (M,K) for a fixed sum spectral efficiency. Through analysis we study the impact of system parameters on the optimal EE. System parameters consists of the average channel gain to the users and the power consumption parameters (PCPs) (e.g., power consumed by each RF antenna/receiver at BS). When the average user channel gain is high or else the BS/UT design is power inefficient, our analysis reveals that it is optimal to have a few BS antennas and a single user, i.e., non-massive MIMO regime. Similarly, when the channel gain is small or else the BS/UT design is power efficient, it is optimal of have a larger (M,K), i.e., massive MIMO regime. Tight analytical bounds on the optimal EE are proposed for both these regimes. The impact of the system parameters on the optimal EE is studied and several interesting insights are drawn.
[ { "created": "Mon, 20 Jan 2014 14:10:13 GMT", "version": "v1" }, { "created": "Fri, 20 Jun 2014 08:45:37 GMT", "version": "v2" }, { "created": "Thu, 30 Oct 2014 13:13:23 GMT", "version": "v3" }, { "created": "Mon, 10 Nov 2014 06:31:08 GMT", "version": "v4" } ]
2016-11-18
[ [ "Mohammed", "Saif Khan", "" ] ]
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1401.4912
Mehdi Molkaraie
Mehdi Molkaraie
An Importance Sampling Scheme on Dual Factor Graphs. I. Models in a Strong External Field
9 pages
null
null
null
stat.CO cond-mat.stat-mech cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose an importance sampling scheme to estimate the partition function of the two-dimensional ferromagnetic Ising model and the two-dimensional ferromagnetic $q$-state Potts model, both in the presence of an external magnetic field. The proposed scheme operates in the dual Forney factor graph and is capable of efficiently computing an estimate of the partition function under a wide range of model parameters. In particular, we consider models that are in a strong external magnetic field.
[ { "created": "Mon, 20 Jan 2014 14:19:09 GMT", "version": "v1" }, { "created": "Thu, 23 Jan 2014 18:48:59 GMT", "version": "v2" }, { "created": "Mon, 16 Jun 2014 01:44:43 GMT", "version": "v3" }, { "created": "Wed, 21 Jan 2015 10:12:39 GMT", "version": "v4" }, { "created": "Thu, 5 Feb 2015 15:20:25 GMT", "version": "v5" } ]
2015-02-06
[ [ "Molkaraie", "Mehdi", "" ] ]
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1401.4913
Krishanu Deyasi
Krishanu Deyasi, Shashankaditya Upadhyay, Anirban Banerjee
Communication on structure of biological networks
null
Pramana, Volume 86, Issue 3 , pp 617-635 (2016)
10.1007/s12043-015-1035-3
null
q-bio.QM physics.soc-ph q-bio.MN
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Networks are widely used to represent interaction pattern among the components in complex systems. Structures of real networks from differ- ent domains may vary quite significantly. Since there is an interplay be- tween network architecture and dynamics, structure plays an important role in communication and information spreading on a network. Here we investigate the underlying undirected topology of different biological networks which support faster spreading of information and are better in communication. We analyze the good expansion property by using the spectral gap and communicability between nodes. Different epidemic models are also used to study the transmission of information in terms of disease spreading through individuals (nodes) in those networks. More- over, we explore the structural conformation and properties which may be responsible for better communication. Among all biological networks studied here, the undirected structure of neuronal networks not only pos- sesses the small-world property but the same is expressed remarkably to a higher degree than any randomly generated network which possesses the same degree sequence. A relatively high percentage of nodes, in neuronal networks, form a higher core in their structure. Our study shows that the underlying undirected topology in neuronal networks is significantly qualitatively different than the same from other biological networks and that they may have evolved in such a way that they inherit a (undirected) structure which is excellent and robust in communication.
[ { "created": "Mon, 20 Jan 2014 14:19:44 GMT", "version": "v1" }, { "created": "Sun, 28 Dec 2014 09:21:38 GMT", "version": "v2" } ]
2016-05-10
[ [ "Deyasi", "Krishanu", "" ], [ "Upadhyay", "Shashankaditya", "" ], [ "Banerjee", "Anirban", "" ] ]
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1401.4916
Jessica Steinlechner
Jessica Steinlechner, Alexander Khalaidovski and Roman Schnabel
Optical Absorption Measurement at 1550 nm on a Highly-Reflective Si/SiO$_2$ Coating Stack
null
null
10.1088/0264-9381/31/10/105005
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Future laser-interferometric gravitational wave detectors (GWDs) will potentially employ test mass mirrors from crystalline silicon and a laser wavelength of $1550\,\rm{nm}$, which corresponds to a photon energy below the silicon bandgap. Silicon might also be an attractive high-refractive index material for the dielectric mirror coatings. Films of amorphous silicon (a-Si), however, have been found to be significantly more absorptive at $1550\,\rm{nm}$ than crystalline silicon (c-Si). Here, we investigate the optical absorption of a Si/SiO$_2$ dielectric coating produced with the ion plating technique. The ion plating technique is distinct from the standard state-of-the-art ion beam sputtering technique since it uses a higher processing temperature of about 250$^\circ$C, higher particle energies, and generally results in higher refractive indices of the deposited films. Our coating stack was fabricated for a reflectivity of $R=99.95\,\%$ for s-polarized light at $1550\,\rm{nm}$ and for an angle of incidence of 44$^\circ$. We used the photothermal self-phase modulation technique to measure the coating absorption in s-polarization and p-polarization. We obtained $\alpha^{\rm coat}_{s}=(1035 \pm 42)\,\rm{ppm}$ and $\alpha^{\rm coat}_{p}=(1428 \pm 97)\,\rm{ppm}$. These results correspond to an absorption coefficient which is lower than literature values for a-Si which vary from $100\,\rm{/cm}$ up to $2000\,\rm{/cm}$. It is, however, still orders of magnitude higher than expected for c-Si and thus still too high for GWD applications.
[ { "created": "Mon, 20 Jan 2014 14:31:02 GMT", "version": "v1" } ]
2015-06-18
[ [ "Steinlechner", "Jessica", "" ], [ "Khalaidovski", "Alexander", "" ], [ "Schnabel", "Roman", "" ] ]
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1401.4917
Philipp Winter
Philipp Winter and Stefan Lindskog
Spoiled Onions: Exposing Malicious Tor Exit Relays
null
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Several hundred Tor exit relays together push more than 1 GiB/s of network traffic. However, it is easy for exit relays to snoop and tamper with anonymised network traffic and as all relays are run by independent volunteers, not all of them are innocuous. In this paper, we seek to expose malicious exit relays and document their actions. First, we monitored the Tor network after developing a fast and modular exit relay scanner. We implemented several scanning modules for detecting common attacks and used them to probe all exit relays over a period of four months. We discovered numerous malicious exit relays engaging in different attacks. To reduce the attack surface users are exposed to, we further discuss the design and implementation of a browser extension patch which fetches and compares suspicious X.509 certificates over independent Tor circuits. Our work makes it possible to continuously monitor Tor exit relays. We are able to detect and thwart many man-in-the-middle attacks which makes the network safer for its users. All our code is available under a free license.
[ { "created": "Mon, 20 Jan 2014 14:31:24 GMT", "version": "v1" } ]
2014-01-21
[ [ "Winter", "Philipp", "" ], [ "Lindskog", "Stefan", "" ] ]
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1401.4927
Merlijn Sevenster
Merlijn Sevenster
Linear Programming Tools for Analyzing Strategic Games of Independence-Friendly Logic and Applications
null
null
null
null
math.LO cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In recent work, semantic games of independence-friendly logic were studied in strategic form in terms of (mixed strategy) Nash equilibria. The class of strategic games of independence-friendly logic is contained in the class of win-loss, zero-sum two-player games. In this note we draw on the theory of linear programming to develop tools to analyze the value of such games. We give two applications of these tools to independence-friendly logic under the so-called equilibrium semantics.
[ { "created": "Mon, 20 Jan 2014 14:54:28 GMT", "version": "v1" } ]
2014-01-21
[ [ "Sevenster", "Merlijn", "" ] ]
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1401.4930
Younes Ra'di
Viktar S. Asadchy, Igar A. Faniayeu, Younes Ra'di, Sergei A. Tretyakov
Determining polarizability tensors for an arbitrary small electromagnetic scatterer
11 pages, 4 figures
null
10.1016/j.photonics.2014.04.004
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we present a method to retrieve tensor polarizabilities of general bi-anisotropic particles from their far-field responses to plane-wave illuminations. The necessary number of probing excitations and the directions where the scattered fields need to be calculated or measured have been found. When implemented numerically, the method does not require any spherical harmonic expansion nor direct calculation of dipole moments, but only calculations of co- and cross-polarized scattering cross sections for a number of plane-wave excitations. With this simple approach, the polarizabilities can be found also from experimentally measured cross sections. The method is exemplified considering two bi-anisotropic particles, a reciprocal omega particle and a non-reciprocal particle containing a ferrite inclusion coupled to metal strips.
[ { "created": "Mon, 20 Jan 2014 15:06:30 GMT", "version": "v1" } ]
2015-06-18
[ [ "Asadchy", "Viktar S.", "" ], [ "Faniayeu", "Igar A.", "" ], [ "Ra'di", "Younes", "" ], [ "Tretyakov", "Sergei A.", "" ] ]
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1401.4931
Viresh Patel
Daniela K\"uhn, Deryk Osthus, Viresh Patel
A domination algorithm for $\{0,1\}$-instances of the travelling salesman problem
29 pages (final version to appear in Random Structures and Algorithms)
null
null
null
cs.DS math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present an approximation algorithm for $\{0,1\}$-instances of the travelling salesman problem which performs well with respect to combinatorial dominance. More precisely, we give a polynomial-time algorithm which has domination ratio $1-n^{-1/29}$. In other words, given a $\{0,1\}$-edge-weighting of the complete graph $K_n$ on $n$ vertices, our algorithm outputs a Hamilton cycle $H^*$ of $K_n$ with the following property: the proportion of Hamilton cycles of $K_n$ whose weight is smaller than that of $H^*$ is at most $n^{-1/29}$. Our analysis is based on a martingale approach. Previously, the best result in this direction was a polynomial-time algorithm with domination ratio $1/2-o(1)$ for arbitrary edge-weights. We also prove a hardness result showing that, if the Exponential Time Hypothesis holds, there exists a constant $C$ such that $n^{-1/29}$ cannot be replaced by $\exp(-(\log n)^C)$ in the result above.
[ { "created": "Mon, 20 Jan 2014 15:07:35 GMT", "version": "v1" }, { "created": "Tue, 26 May 2015 10:28:30 GMT", "version": "v2" } ]
2015-05-27
[ [ "Kühn", "Daniela", "" ], [ "Osthus", "Deryk", "" ], [ "Patel", "Viresh", "" ] ]
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1401.4932
Egor Ianovski
Egor Ianovski
The existential fragment of S1S over element and successor is the co-Buchi languages
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cs.FL cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Buchi's theorem, in establishing the equivalence between languages definable in S1S over element and < and the omega-regular languages also demonstrated that S1S over element and < is no more expressive than its existential fragment. It is also easy to see that S1S over element and < is equi-expressive with S1S over element and successor. However, it is not immediately obvious whether it is possible to adapt Buchi's argument to establish equivalence between expressivity in S1S over element and successor and its existential fragment. In this paper we show that it is not: the existential fragment of S1S over element and successor is strictly less expressive, and is in fact equivalent to the co-Buchi languages.
[ { "created": "Mon, 20 Jan 2014 15:07:42 GMT", "version": "v1" } ]
2014-01-21
[ [ "Ianovski", "Egor", "" ] ]
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1401.4935
Chithrupa Ramesh
Chithrupa Ramesh, Henrik Sandberg and Karl H. Johansson
Performance Analysis of a Network of Event-based Systems
null
null
null
null
cs.SY cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a scenario where multiple event-based systems use a wireless network to communicate with their respective controllers. These systems use a contention resolution mechanism (CRM) to arbitrate access to the network. We present a Markov model for the network interactions between the event-based systems. Using this model, we obtain an analytical expression for the reliability, or the probability of successfully transmitting a packet, in this network. There are two important aspects to our model. Firstly, our model captures the joint interactions of the event-triggering policy and the CRM. This is required because event-triggering policies typically adapt to the CRM outcome. Secondly, the model is obtained by decoupling interactions between the different systems in the network, drawing inspiration from Bianchi's analysis of IEEE 802.11. This is required because the network interactions introduce a correlation between the system variables. We present Monte-Carlo simulations that validate our model under various network configurations, and verify our performance analysis as well.
[ { "created": "Mon, 20 Jan 2014 15:20:40 GMT", "version": "v1" } ]
2014-01-21
[ [ "Ramesh", "Chithrupa", "" ], [ "Sandberg", "Henrik", "" ], [ "Johansson", "Karl H.", "" ] ]
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1401.4936
Rodrigo de Lamare
P. Li and R. C. de Lamare
Low-Complexity Robust Data-Adaptive Dimensionality Reduction Based on Joint Iterative Optimization of Parameters
5 pages, 3 figures. CAMSAP 2013
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a low-complexity robust data-dependent dimensionality reduction based on a modified joint iterative optimization (MJIO) algorithm for reduced-rank beamforming and steering vector estimation. The proposed robust optimization procedure jointly adjusts the parameters of a rank-reduction matrix and an adaptive beamformer. The optimized rank-reduction matrix projects the received signal vector onto a subspace with lower dimension. The beamformer/steering vector optimization is then performed in a reduced-dimension subspace. We devise efficient stochastic gradient and recursive least-squares algorithms for implementing the proposed robust MJIO design. The proposed robust MJIO beamforming algorithms result in a faster convergence speed and an improved performance. Simulation results show that the proposed MJIO algorithms outperform some existing full-rank and reduced-rank algorithms with a comparable complexity.
[ { "created": "Mon, 20 Jan 2014 15:21:49 GMT", "version": "v1" } ]
2014-01-21
[ [ "Li", "P.", "" ], [ "de Lamare", "R. C.", "" ] ]
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