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1401.6249
Yangjia Li
Yangjia Li and Mingsheng Ying
(Un)decidable Problems about Reachability of Quantum Systems
null
null
null
null
cs.LO quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the reachability problem of a quantum system modelled by a quantum automaton. The reachable sets are chosen to be boolean combinations of (closed) subspaces of the state space of the quantum system. Four different reachability properties are considered: eventually reachable, globally reachable, ultimately forever reachable, and infinitely often reachable. The main result of this paper is that all of the four reachability properties are undecidable in general; however, the last three become decidable if the reachable sets are boolean combinations without negation.
[ { "created": "Fri, 24 Jan 2014 03:47:29 GMT", "version": "v1" } ]
2014-01-27
[ [ "Li", "Yangjia", "" ], [ "Ying", "Mingsheng", "" ] ]
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1401.6252
Masaaki Harada
Masaaki Harada
Note on the residue codes of self-dual $\mathbb{Z}_4$-codes having large minimum Lee weights
18 pages
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null
null
math.CO cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is shown that the residue code of a self-dual $\mathbb{Z}_4$-code of length $24k$ (resp.\ $24k+8$) and minimum Lee weight $8k+4 \text{ or }8k+2$ (resp.\ $8k+8 \text{ or }8k+6$) is a binary extremal doubly even self-dual code for every positive integer $k$. A number of new self-dual $\mathbb{Z}_4$-codes of length $24$ and minimum Lee weight $10$ are constructed using the above characterization. These codes are Type I $\mathbb{Z}_4$-codes having the largest minimum Lee weight and the largest Euclidean weight among all Type I $\mathbb{Z}_4$-codes of that length. In addition, new extremal Type II $\mathbb{Z}_4$-codes of length $56$ are found.
[ { "created": "Fri, 24 Jan 2014 03:48:41 GMT", "version": "v1" }, { "created": "Wed, 26 Mar 2014 02:55:22 GMT", "version": "v2" }, { "created": "Mon, 16 Mar 2015 10:20:26 GMT", "version": "v3" } ]
2015-03-17
[ [ "Harada", "Masaaki", "" ] ]
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1401.6253
Vladimir Salomatov
Vladimir Salomatov
Relativistic particle in the rest frame
null
null
null
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is shown that for a specific choice of a particular solution of the relativistic wave equation, it falls into the Helmholtz equation and the Klein -Gordon equation. In this case, the squares of the rest masses of the particle with the relativistic dispersion relation are determined by the Helmholtz equation. It is suggested the possibility in principle of classification of the mass spectrum and lifetimes of the particles according to the discrete solutions of the Helmholtz equation in a particular model. In this case, it can be assumed that the lifetime of a particle is determined by the ratio of contributions to the wave function of the Bessel and collapsed Neumann functions. An opportunity to compare real elementary particles rest masses and especially lifetimes with the particles masses and lifetimes considered is discussed.
[ { "created": "Fri, 24 Jan 2014 03:52:17 GMT", "version": "v1" } ]
2014-01-27
[ [ "Salomatov", "Vladimir", "" ] ]
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1401.6254
Masaaki Harada
Masaaki Harada
On a 5-design related to a putative extremal doubly even self-dual code of length a multiple of 24
16 pages, Designs, Codes and Cryptogr. (to appear)
Designs, Codes and Cryptogr. 76 (2015), 373-384
null
null
math.CO cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
By the Assmus and Mattson theorem, the codewords of each nontrivial weight in an extremal doubly even self-dual code of length 24m form a self-orthogonal 5-design. In this paper, we study the codes constructed from self-orthogonal 5-designs with the same parameters as the above 5-designs. We give some parameters of a self-orthogonal 5-design whose existence is equivalent to that of an extremal doubly even self-dual code of length 24m for m=3,...,6. If $m \in \{1,\ldots,6\}$, $k \in \{m+1,\ldots,5m-1\}$ and $(m,k) \ne (6,18)$, then it is shown that an extremal doubly even self-dual code of length 24m is generated by codewords of weight 4k.
[ { "created": "Fri, 24 Jan 2014 03:54:09 GMT", "version": "v1" }, { "created": "Wed, 19 Mar 2014 08:46:02 GMT", "version": "v2" } ]
2015-09-18
[ [ "Harada", "Masaaki", "" ] ]
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1401.6258
Yinfei Xu Mr.
Yinfei Xu and Qiao Wang
Rate Region of the Vector Gaussian CEO Problem with the Trace Distortion Constraint
12 pages, 1 figures, a shorter version is submitted for publication in IEEE International Symposium on Information Theory (ISIT), 2014
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We establish a new extremal inequality, which is further leveraged to give a complete characterization of the rate region of the vector Gaussian CEO problem with the trace distortion constraint. The proof of this extremal inequality hinges on a careful analysis of the Karush-Kuhn-Tucker necessary conditions for the non-convex optimization problem associated with the Berger-Tung scheme, which enables us to integrate the perturbation argument by Wang and Chen with the distortion projection method by Rahman and Wagner.
[ { "created": "Fri, 24 Jan 2014 04:44:38 GMT", "version": "v1" }, { "created": "Wed, 29 Jan 2014 09:55:57 GMT", "version": "v2" }, { "created": "Mon, 10 Feb 2014 02:28:10 GMT", "version": "v3" }, { "created": "Wed, 19 Feb 2014 08:23:45 GMT", "version": "v4" }, { "created": "Thu, 20 Feb 2014 11:37:52 GMT", "version": "v5" } ]
2014-02-21
[ [ "Xu", "Yinfei", "" ], [ "Wang", "Qiao", "" ] ]
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1401.6260
Yijin Zhang
Yijin Zhang, Yuan-Hsun Lo, Feng Shu and Wing Shing Wong
Protocol Sequences for Multiple-Packet Reception
25 pages, 4 figures. A revision submitted to IEEE Trans. Inform. Theory
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Consider a time slotted communication channel shared by $K$ active users and a single receiver. It is assumed that the receiver has the ability of the multiple-packet reception (MPR) to correctly receive at most $\gamma$ ($1 \leq \gamma < K$) simultaneously transmitted packets. Each user accesses the channel following a specific periodical binary sequence, called the protocol sequence, and transmits a packet within a channel slot if and only if the sequence value is equal to one. The fluctuation in throughput is incurred by inevitable random relative shifts among the users due to the lack of feedback. A set of protocol sequences is said to be throughput-invariant (TI) if it can be employed to produce invariant throughput for any relative shifts, i.e., maximize the worst-case throughput. It was shown in the literature that the TI property without considering MPR (i.e., $\gamma=1$) can be achieved by using shift-invariant (SI) sequences, whose generalized Hamming cross-correlation is independent of relative shifts. This paper investigates TI sequences for MPR; results obtained include achievable throughput value, a lower bound on the sequence period, an optimal construction of TI sequences that achieves the lower bound on the sequence period, and intrinsic structure of TI sequences. In addition, we present a practical packet decoding mechanism for TI sequences that incorporates packet header, forward error-correcting code, and advanced physical layer blind signal separation techniques.
[ { "created": "Fri, 24 Jan 2014 05:23:52 GMT", "version": "v1" }, { "created": "Fri, 26 Sep 2014 09:43:25 GMT", "version": "v2" } ]
2014-09-29
[ [ "Zhang", "Yijin", "" ], [ "Lo", "Yuan-Hsun", "" ], [ "Shu", "Feng", "" ], [ "Wong", "Wing Shing", "" ] ]
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1401.6262
Benjamin Roberts
B. M. Roberts, V. A. Dzuba, V. V. Flambaum
Strongly enhanced atomic parity violation due to close levels of opposite parity
15 pages, 19 tables, 0 figures
Phys. Rev. A 89, 042509 (2014)
10.1103/PhysRevA.89.042509
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present calculations of nuclear-spin-dependent and nuclear-spin-independent parity violating amplitudes in Ba, Ra, Ac+, Th and Pa. Parity nonconservation in these systems is greatly enhanced due to the presence of very close electronic energy levels of opposite parity, large nuclear charge, and strong nuclear enhancement of parity-violating effects. The presented amplitudes constitute several of the largest atomic parity-violating signals predicted so far. Experiments using these systems may be performed to determine values for the nuclear anapole moment, a P-odd T-even nuclear moment given rise to by parity-violating nuclear forces. Such measurements may prove to be valuable tools in the study of parity violation in the hadron sector. The considered spin-independent transitions could also be used to measure the ratio of weak charges for different isotopes of the same atom, the results of which would serve as a test of the standard model and also of neutron distributions. Barium, with seven stable isotopes, is particularly promising in this regard.
[ { "created": "Fri, 24 Jan 2014 05:27:24 GMT", "version": "v1" } ]
2014-04-23
[ [ "Roberts", "B. M.", "" ], [ "Dzuba", "V. A.", "" ], [ "Flambaum", "V. V.", "" ] ]
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1401.6264
Reevana Balmahoon
Reevana Balmahoon and Ling Cheng
Information Leakage of Correlated Source Coded Sequences over Channel with an Eavesdropper
null
null
null
null
cs.IT math.IT
http://creativecommons.org/licenses/by-nc-sa/3.0/
A new generalised approach for multiple correlated sources over a wiretap network is investigated. A basic model consisting of two correlated sources where each produce a component of the common information is initially investigated. There are several cases that consider wiretapped syndromes on the transmission links and based on these cases a new quantity, the information leakage at the source/s is determined. An interesting feature of the models described in this paper is the information leakage quantification. Shannon's cipher system with eavesdroppers is incorporated into the two correlated sources model to minimize key lengths. These aspects of quantifying information leakage and reducing key lengths using Shannon's cipher system are also considered for a multiple correlated source network approach. A new scheme that incorporates masking using common information combinations to reduce the key lengths is presented and applied to the generalised model for multiple sources.
[ { "created": "Fri, 24 Jan 2014 05:59:22 GMT", "version": "v1" }, { "created": "Tue, 11 Mar 2014 14:00:09 GMT", "version": "v10" }, { "created": "Sat, 22 Mar 2014 12:21:16 GMT", "version": "v11" }, { "created": "Thu, 2 Oct 2014 21:00:56 GMT", "version": "v12" }, { "created": "Mon, 24 Feb 2014 20:19:38 GMT", "version": "v2" }, { "created": "Tue, 25 Feb 2014 20:28:55 GMT", "version": "v3" }, { "created": "Wed, 26 Feb 2014 11:30:59 GMT", "version": "v4" }, { "created": "Thu, 27 Feb 2014 12:08:43 GMT", "version": "v5" }, { "created": "Tue, 4 Mar 2014 09:53:00 GMT", "version": "v6" }, { "created": "Wed, 5 Mar 2014 20:14:18 GMT", "version": "v7" }, { "created": "Fri, 7 Mar 2014 17:33:50 GMT", "version": "v8" }, { "created": "Mon, 10 Mar 2014 16:47:59 GMT", "version": "v9" } ]
2014-10-06
[ [ "Balmahoon", "Reevana", "" ], [ "Cheng", "Ling", "" ] ]
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1401.6267
Harun Rasit Er M.S.
Harun Rasit Er, Nadia Erdogan
Parallel Genetic Algorithm to Solve Traveling Salesman Problem on MapReduce Framework using Hadoop Cluster
The International Journal of Soft Computing and Software Engineering [JSCSE], Vol. 3, No. 3, Special Issue. The Proceeding of International Conference on Soft Computing and Software Engineering 2013
null
10.7321/jscse.v3.n3.57
e-ISSN: 2251-7545
cs.DC cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Traveling Salesman Problem (TSP) is one of the most common studied problems in combinatorial optimization. Given the list of cities and distances between them, the problem is to find the shortest tour possible which visits all the cities in list exactly once and ends in the city where it starts. Despite the Traveling Salesman Problem is NP-Hard, a lot of methods and solutions are proposed to the problem. One of them is Genetic Algorithm (GA). GA is a simple but an efficient heuristic method that can be used to solve Traveling Salesman Problem. In this paper, we will show a parallel genetic algorithm implementation on MapReduce framework in order to solve Traveling Salesman Problem. MapReduce is a framework used to support distributed computation on clusters of computers. We used free licensed Hadoop implementation as MapReduce framework.
[ { "created": "Fri, 24 Jan 2014 06:59:08 GMT", "version": "v1" } ]
2014-01-27
[ [ "Er", "Harun Rasit", "" ], [ "Erdogan", "Nadia", "" ] ]
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1401.6275
Hongyi Zeng
Hongyi Zeng, Wei Chen
Delay-Energy lower bound on Two-Way Relay Wireless Network Coding
null
null
null
null
cs.IT cs.NI math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Network coding is a novel solution that significantly improve the throughput and energy consumed of wireless networks by mixing traffic flows through algebraic operations. In conventional network coding scheme, a packet has to wait for packets from other sources to be coded before transmitting. The wait-and-code scheme will naturally result in packet loss rate in a finite buffer. We will propose Enhanced Network Coding (ENC), an extension to ONC in continuous time domain. In ENC, the relay transmits both coded and uncoded packets to reduce delay. In exchange, more energy is consumed in transmitting uncoded packets. ENC is a practical algorithm to achieve minimal average delay and zero packet-loss rate under given energy constraint. The system model for ENC on a general renewal process queuing is presented. In particular, we will show that there exists a fundamental trade-off between average delay and energy. We will also present the analytic result of lower bound for this trade-off curve, which can be achieved by ENC.
[ { "created": "Fri, 24 Jan 2014 07:49:37 GMT", "version": "v1" } ]
2014-01-27
[ [ "Zeng", "Hongyi", "" ], [ "Chen", "Wei", "" ] ]
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1401.6290
Ghazal Riahi
Ghazal Riahi
A Security Plan for Smart Grid Systems Based On AGC4ISR
The International Journal of Soft Computing and Software Engineering [JSCSE], Vol. 3, No. 3, Special Issue
International Journal of Soft Computing and Software Engineering [JSCSE], Vol. 3, No. 3, 2013 pp.760-768
10.7321/jscse.v3.n3.115
null
cs.CR cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper is proposed a security plan for Smart Grid Systems based on AGC4ISR which is an architecture for Autonomic Grid Computing Systems. Smart Grid incorporates has many benefits of distributed computing and communications to deliver a real-time information and enable the near-instantaneous balance of supply and demand at the device level. AGC4ISR architecture is Organized by Autonomic Grid Computing and C4ISR (Command, Control, Communications, Computers and Intelligence, Surveillance, & Reconnaissance) Architecture. In this paper we will present a solution for as security plan which will be consider encryption, intrusion detection, key management and detail of cyber security in Smart Grids. In this paper we use the cryptography for the packet in the C4ISR and we use a key management for send and receive a packet in the smart grid because it is necessary for intelligent networks to keeping away from packet missing.
[ { "created": "Fri, 24 Jan 2014 09:08:30 GMT", "version": "v1" } ]
2014-01-27
[ [ "Riahi", "Ghazal", "" ] ]
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1401.6294
Badong Chen
Badong Chen, Guangmin Wang, Nanning Zheng, Jose C. Principe
An Extended Result on the Optimal Estimation under Minimum Error Entropy Criterion
15 pages, no figures, submitted to Entropy
Entropy 2014, 16(4), 2223-2233
10.3390/e16042223
null
cs.IT math.IT math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The minimum error entropy (MEE) criterion has been successfully used in fields such as parameter estimation, system identification and the supervised machine learning. There is in general no explicit expression for the optimal MEE estimate unless some constraints on the conditional distribution are imposed. A recent paper has proved that if the conditional density is conditionally symmetric and unimodal (CSUM), then the optimal MEE estimate (with Shannon entropy) equals the conditional median. In this study, we extend this result to the generalized MEE estimation where the optimality criterion is the Renyi entropy or equivalently, the \alpha-order information potential (IP).
[ { "created": "Fri, 24 Jan 2014 09:27:32 GMT", "version": "v1" } ]
2015-04-14
[ [ "Chen", "Badong", "" ], [ "Wang", "Guangmin", "" ], [ "Zheng", "Nanning", "" ], [ "Principe", "Jose C.", "" ] ]
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1401.6300
Johan Anderson
Johan Anderson, Hans Nordman, Raghvendra Singh
Effects of the Second Harmonic on the GAM in Electron Scale Turbulence
12 pages, 1 figure. Work presented at 15th EFTC 2013, September 23-26th, Oxford, England
null
null
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The effects higher order harmonics have been self-consistently included in the derivation of the electron branch of the electron Geodesic Acoustic Mode (el-GAM) in an Electron-Temperature-Gradient (ETG) turbulence background. The work is based on a two-fluid model including finite $\beta$-effects while retaining non-adiabatic ions. In solving the linear dispersion relation, it is found that the due to the coupling to the $m=2$ mode the real frequency may be significantly altered and yield higher values.
[ { "created": "Fri, 24 Jan 2014 09:58:08 GMT", "version": "v1" } ]
2014-01-27
[ [ "Anderson", "Johan", "" ], [ "Nordman", "Hans", "" ], [ "Singh", "Raghvendra", "" ] ]
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1401.6302
Frank Simon
Frank Simon
Higgs Physics at future Linear Colliders - A Case for precise Vertexing
9 pages, 4 figures, to be published in the proceedings of the 22nd International Workshop on Vertex Detectors VERTEX 2013, Lake Starnberg, Germany, September 2013, v2 updated references. arXiv admin note: substantial text overlap with arXiv:1211.7242
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null
MPP-2014-12
hep-ex hep-ph physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The discovery of a Higgs boson by the experiments at the LHC marks a major breakthrough in particle physics, with far-reaching consequences for our understanding of the fundamental principles of our Universe. To fully explore this unique particle, experiments at high-energy electron-positron colliders are being planned, providing substantial added benefit over the capabilities of the LHC alone, such as model-independent measurements of couplings, constraints on invisible decays and precise measurements of the self-coupling. This contribution summarizes the Higgs physics program at such future facilities, highlighting in particular also the role of precise vertexing in achieving the ambitious goals of these experiments.
[ { "created": "Fri, 24 Jan 2014 10:20:25 GMT", "version": "v1" }, { "created": "Mon, 27 Jan 2014 19:38:29 GMT", "version": "v2" } ]
2014-01-28
[ [ "Simon", "Frank", "" ] ]
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1401.6304
Natalia Dueck
Natalia D\"uck and Karl-Heinz Zimmermann
Graver Bases and Universal Gr\"obner Bases for Linear Codes
18 pages
null
null
null
math.AC cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Two correspondences have been provided that associate any linear code over a finite field with a binomial ideal. In this paper, algorithms for computing their Graver bases and universal Gr\"obner bases are given. To this end, a connection between these binomial ideals and toric ideals will be established.
[ { "created": "Fri, 24 Jan 2014 10:28:00 GMT", "version": "v1" }, { "created": "Wed, 7 May 2014 11:59:28 GMT", "version": "v2" } ]
2014-05-08
[ [ "Dück", "Natalia", "" ], [ "Zimmermann", "Karl-Heinz", "" ] ]
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1401.6307
Florent Capelli
Florent Capelli, Arnaud Durand, Stefan Mengel
Hypergraph Acyclicity and Propositional Model Counting
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null
null
null
cs.CC cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that the propositional model counting problem #SAT for CNF- formulas with hypergraphs that allow a disjoint branches decomposition can be solved in polynomial time. We show that this class of hypergraphs is incomparable to hypergraphs of bounded incidence cliquewidth which were the biggest class of hypergraphs for which #SAT was known to be solvable in polynomial time so far. Furthermore, we present a polynomial time algorithm that computes a disjoint branches decomposition of a given hypergraph if it exists and rejects otherwise. Finally, we show that some slight extensions of the class of hypergraphs with disjoint branches decompositions lead to intractable #SAT, leaving open how to generalize the counting result of this paper.
[ { "created": "Fri, 24 Jan 2014 10:33:23 GMT", "version": "v1" } ]
2014-01-27
[ [ "Capelli", "Florent", "" ], [ "Durand", "Arnaud", "" ], [ "Mengel", "Stefan", "" ] ]
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1401.6308
Behrooz Ferdowsi
B. Ferdowsi, M. Griffa, R. A. Guyer, P. A. Johnson, J. Carmeliet
Effect of boundary vibration on the frictional behavior of a dense sheared granular layer
null
null
10.1007/s00707-014-1136-y
null
physics.geo-ph cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report results of 3D Discrete Element Method (DEM) simulations aiming at investigating the role of the boundary vibration in inducing frictional weakening in sheared granular layers. We study the role of different vibration amplitudes applied at various shear stress levels, for a granular layer in the stick-slip regime and in the steady-sliding regime. Results are reported in terms of friction drops and kinetic energy release associated with frictional weakening events. We find that larger vibration amplitude induces larger frictional weakening events. The results show evidence of a threshold below which no induced frictional weakening takes place. Friction drop size is found to be dependent on the shear stress at the time of vibration. A significant increase in the ratio between the number of slipping contacts to the number of sticking contacts in the granular layer is observed for large vibration amplitudes. These vibration-induced contact rearrangements enhance particle mobilization and induces a friction drop and kinetic energy release. This observation provides some insight into the grain-scale mechanisms of frictional weakening by boundary vibration in a dense sheared granular layer. In addition to characterizing the basic physics of vibration induced shear weakening, we are attempting to understand how a fault fails in the earth under seismic wave forcing. This is the well know phenomenon of dynamic earthquake triggering. We believe that the granular physics are key to this understanding.
[ { "created": "Fri, 24 Jan 2014 10:34:08 GMT", "version": "v1" } ]
2014-05-05
[ [ "Ferdowsi", "B.", "" ], [ "Griffa", "M.", "" ], [ "Guyer", "R. A.", "" ], [ "Johnson", "P. A.", "" ], [ "Carmeliet", "J.", "" ] ]
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1401.6309
Vladislav Orekhov
Maxim Mayzel, Krzysztof Kazimierczuk, and Vladislav Yu. Orekhov
Causality principle in reconstruction of sparse NMR spectra
changes in v2: fixed typos and minor text corrections
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physics.chem-ph cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Rapid development of sparse sampling methodology offers dramatic increase in power and efficiency of magnetic resonance techniques in medicine, chemistry, molecular structural biology, and other fields. We suggest to use available yet usually unexploited prior knowledge about the phase and the causality of the sparsely detected NMR signal as a general approach for a major improvement of the spectra quality. The work gives a theoretical framework of the method and demonstrates notable improvement of the protein spectra reconstructed with two commonly used state-of-the-art signal processing algorithms, compressed sensing and SIFT.
[ { "created": "Fri, 24 Jan 2014 10:35:23 GMT", "version": "v1" }, { "created": "Mon, 27 Jan 2014 10:54:59 GMT", "version": "v2" } ]
2014-01-28
[ [ "Mayzel", "Maxim", "" ], [ "Kazimierczuk", "Krzysztof", "" ], [ "Orekhov", "Vladislav Yu.", "" ] ]
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1401.6310
Matthew England Dr
R. Bradford, C. Chen, J.H. Davenport, M. England, M. Moreno Maza and D. Wilson
Truth Table Invariant Cylindrical Algebraic Decomposition by Regular Chains
null
V.P. Gerdt W. Koepf, W.M. Seiler and E.V. Vorozhtsov, eds. Computer Algebra in Scientific Computing, pp. 44-58. (Lecture Notes in Computer Science, 8660). Springer International, 2014
10.1007/978-3-319-10515-4_4
null
cs.SC math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new algorithm to compute cylindrical algebraic decompositions (CADs) is presented, building on two recent advances. Firstly, the output is truth table invariant (a TTICAD) meaning given formulae have constant truth value on each cell of the decomposition. Secondly, the computation uses regular chains theory to first build a cylindrical decomposition of complex space (CCD) incrementally by polynomial. Significant modification of the regular chains technology was used to achieve the more sophisticated invariance criteria. Experimental results on an implementation in the RegularChains Library for Maple verify that combining these advances gives an algorithm superior to its individual components and competitive with the state of the art.
[ { "created": "Fri, 24 Jan 2014 10:52:25 GMT", "version": "v1" }, { "created": "Thu, 17 Apr 2014 15:28:40 GMT", "version": "v2" }, { "created": "Tue, 10 Jun 2014 10:08:22 GMT", "version": "v3" } ]
2014-09-04
[ [ "Bradford", "R.", "" ], [ "Chen", "C.", "" ], [ "Davenport", "J. H.", "" ], [ "England", "M.", "" ], [ "Maza", "M. Moreno", "" ], [ "Wilson", "D.", "" ] ]
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1401.6312
Bart Bogaerts
Broes De Cat, Bart Bogaerts, Maurice Bruynooghe, Gerda Janssens and Marc Denecker
Predicate Logic as a Modelling Language: The IDP System
null
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
With the technology of the time, Kowalski's seminal 1974 paper {\em Predicate Logic as a Programming Language} was a breakthrough for the use of logic in computer science. It introduced two fundamental ideas: on the declarative side, the use of the Horn clause logic fragment of classical logic, which was soon extended with negation as failure, on the procedural side the procedural interpretation which made it possible to write algorithms in the formalism. Since then, strong progress was made both on the declarative understanding of the logic programming formalism and in automated reasoning technologies, particularly in SAT solving, Constraint Programming and Answer Set Programming. This has paved the way for the development of an extension of logic programming that embodies a more pure view of logic as a modelling language and its role for problem solving. In this paper, we present the \idp language and system. The language is essentially classical logic extended with one of logic programmings most important contributions to knowledge representation: the representation of complex definitions as rule sets under well-founded semantics. The system is a knowledge base system: a system in which complex declarative information is stored in a knowledge base which can be used to solve different computational problems by applying multiple forms of inference. In this view, theories are declarative modellings, bags of information, descriptions of possible states of affairs. They are neither procedures nor descriptions of computational problems. As such, the \idp language and system preserve the fundamental idea of a declarative reading of logic programs, while they break with the fundamental idea of the procedural interpretation of logic programs.
[ { "created": "Fri, 24 Jan 2014 11:13:43 GMT", "version": "v1" }, { "created": "Wed, 9 Mar 2016 09:43:32 GMT", "version": "v2" }, { "created": "Tue, 13 Mar 2018 13:06:19 GMT", "version": "v3" } ]
2018-03-14
[ [ "De Cat", "Broes", "" ], [ "Bogaerts", "Bart", "" ], [ "Bruynooghe", "Maurice", "" ], [ "Janssens", "Gerda", "" ], [ "Denecker", "Marc", "" ] ]
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1401.6317
Muhammad Aamir
Muhammad Aamir and Mustafa Ali Zaidi
DDoS Attack and Defense: Review of Some Traditional and Current Techniques
This paper is being withdrawn by the author due to a critical signing mistake in equation 5
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Distributed Denial of Service (DDoS) attacks exhaust victim's bandwidth or services. Traditional architecture of Internet is vulnerable to DDoS attacks and an ongoing cycle of attack & defense is observed. In this paper, different types and techniques of DDoS attacks and their countermeasures are reviewed. The significance of this paper is the coverage of many aspects of countering DDoS attacks including new research on the topic. We survey different papers describing methods of defense against DDoS attacks based on entropy variations, traffic anomaly parameters, neural networks, device level defense, botnet flux identifications and application layer DDoS defense. We also discuss some traditional methods of defense such as traceback and packet filtering techniques so that readers can identify major differences between traditional and current techniques of defense against DDoS attacks. Before the discussion on countermeasures, we mention different attack types under DDoS with traditional and advanced schemes while some information on DDoS trends in the year 2012 Quarter-1 is also provided. We identify that application layer DDoS attacks possess the ability to produce greater impact on the victim as they are driven by legitimate-like traffic making it quite difficult to identify and distinguish from legitimate requests. The need of improved defense against such attacks is therefore more demanding in research. The study conducted in this paper can be helpful for readers and researchers to recognize better techniques of defense in current times against DDoS attacks and contribute with more research on the topic in the light of future challenges identified in this paper.
[ { "created": "Fri, 24 Jan 2014 11:43:28 GMT", "version": "v1" }, { "created": "Fri, 21 Mar 2014 19:36:21 GMT", "version": "v2" } ]
2014-03-24
[ [ "Aamir", "Muhammad", "" ], [ "Zaidi", "Mustafa Ali", "" ] ]
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1401.6318
Pat O'Mahony
Ana Laura Frapiccini, Aliou Hamido, Sebastian Schr\"oter, Dean Pyke, Francisca Mota-Furtado, Patrick F. O'Mahony, Javier Madro\~nero, Johannes Eiglsperger and Bernard Piraux
Explicit schemes for time propagating many-body wavefunctions
24 pages, 14 Figures
Physical Review A, 89, 023418 (2014)
10.1103/PhysRevA.89.023418
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Accurate theoretical data on many time-dependent processes in atomic and molecular physics and in chemistry require the direct numerical solution of the time-dependent Schr\"odinger equation, thereby motivating the development of very efficient time propagators. These usually involve the solution of very large systems of first order differential equations that are characterized by a high degree of stiffness. We analyze and compare the performance of the explicit one-step algorithms of Fatunla and Arnoldi. Both algorithms have exactly the same stability function, therefore sharing the same stability properties that turn out to be optimum. Their respective accuracy however differs significantly and depends on the physical situation involved. In order to test this accuracy, we use a predictor-corrector scheme in which the predictor is either Fatunla's or Arnoldi's algorithm and the corrector, a fully implicit four-stage Radau IIA method of order 7. We consider two physical processes. The first one is the ionization of an atomic system by a short and intense electromagnetic pulse; the atomic systems include a one-dimensional Gaussian model potential as well as atomic hydrogen and helium, both in full dimensionality. The second process is the decoherence of two-electron quantum states when a time independent perturbation is applied to a planar two-electron quantum dot where both electrons are confined in an anharmonic potential. Even though the Hamiltonian of this system is time independent the corresponding differential equation shows a striking stiffness. For the one-dimensional Gaussian potential we discuss in detail the possibility of monitoring the time step for both explicit algorithms. In the other physical situations that are much more demanding in term of computations, we show that the accuracy of both algorithms depends strongly on the degree of stiffness of the problem.
[ { "created": "Fri, 24 Jan 2014 11:44:31 GMT", "version": "v1" } ]
2015-06-18
[ [ "Frapiccini", "Ana Laura", "" ], [ "Hamido", "Aliou", "" ], [ "Schröter", "Sebastian", "" ], [ "Pyke", "Dean", "" ], [ "Mota-Furtado", "Francisca", "" ], [ "O'Mahony", "Patrick F.", "" ], [ "Madroñero", "Javier", "" ], [ "Eiglsperger", "Johannes", "" ], [ "Piraux", "Bernard", "" ] ]
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1401.6325
Jonathan Kochems
Jonathan Kochems, C-H Luke Ong
Safety verification of asynchronous pushdown systems with shaped stacks
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null
null
null
cs.LO cs.FL cs.PL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we study the program-point reachability problem of concurrent pushdown systems that communicate via unbounded and unordered message buffers. Our goal is to relax the common restriction that messages can only be retrieved by a pushdown process when its stack is empty. We use the notion of partially commutative context-free grammars to describe a new class of asynchronously communicating pushdown systems with a mild shape constraint on the stacks for which the program-point coverability problem remains decidable. Stacks that fit the shape constraint may reach arbitrary heights; further a process may execute any communication action (be it process creation, message send or retrieval) whether or not its stack is empty. This class extends previous computational models studied in the context of asynchronous programs, and enables the safety verification of a large class of message passing programs.
[ { "created": "Fri, 24 Jan 2014 12:26:27 GMT", "version": "v1" } ]
2014-01-27
[ [ "Kochems", "Jonathan", "" ], [ "Ong", "C-H Luke", "" ] ]
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1401.6328
Stefan Nagele
Stefan Nagele, Renate Pazourek, Michael Wais, Georg Wachter, and Joachim Burgd\"orfer
Time-resolved photoemission using attosecond streaking
Submitted to J.Phys.Conf.Ser. (ICPEAC 2013 conference proceedings) on 27.09.2013, accepted on 28.10.2013, final version submitted on 15.11.2013
J. Phys.: Conf. Ser. 488, 012004 (2014)
10.1088/1742-6596/488/1/012004
null
physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We theoretically study time-resolved photoemission in atoms as probed by attosecond streaking. We review recent advances in the study of the photoelectric effect in the time domain and show that the experimentally accessible time shifts can be decomposed into distinct contributions that stem from the field-free photoionization process itself and from probe-field induced corrections. We perform accurate quantum-mechanical as well as classical simulations of attosecond streaking for effective one-electron systems and determine all relevant contributions to the time delay with attosecond precision. In particular, we investigate the properties and limitations of attosecond streaking for the transition from short-ranged potentials (photodetachment) to long-ranged Coulomb potentials (photoionization). As an example for a more complex system, we study time-resolved photoionization for endohedral fullerenes $A$@$\text{C}_{60}$ and discuss how streaking time shifts are modified due to the interaction of the $\text{C}_{60}$ cage with the probing infrared streaking field.
[ { "created": "Fri, 24 Jan 2014 12:52:26 GMT", "version": "v1" } ]
2015-03-06
[ [ "Nagele", "Stefan", "" ], [ "Pazourek", "Renate", "" ], [ "Wais", "Michael", "" ], [ "Wachter", "Georg", "" ], [ "Burgdörfer", "Joachim", "" ] ]
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1401.6330
Li Dong
Li Dong, Furu Wei, Shujie Liu, Ming Zhou, Ke Xu
A Statistical Parsing Framework for Sentiment Classification
Accepted by Computational Linguistics
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null
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cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a statistical parsing framework for sentence-level sentiment classification in this article. Unlike previous works that employ syntactic parsing results for sentiment analysis, we develop a statistical parser to directly analyze the sentiment structure of a sentence. We show that complicated phenomena in sentiment analysis (e.g., negation, intensification, and contrast) can be handled the same as simple and straightforward sentiment expressions in a unified and probabilistic way. We formulate the sentiment grammar upon Context-Free Grammars (CFGs), and provide a formal description of the sentiment parsing framework. We develop the parsing model to obtain possible sentiment parse trees for a sentence, from which the polarity model is proposed to derive the sentiment strength and polarity, and the ranking model is dedicated to selecting the best sentiment tree. We train the parser directly from examples of sentences annotated only with sentiment polarity labels but without any syntactic annotations or polarity annotations of constituents within sentences. Therefore we can obtain training data easily. In particular, we train a sentiment parser, s.parser, from a large amount of review sentences with users' ratings as rough sentiment polarity labels. Extensive experiments on existing benchmark datasets show significant improvements over baseline sentiment classification approaches.
[ { "created": "Fri, 24 Jan 2014 12:56:36 GMT", "version": "v1" }, { "created": "Thu, 5 Mar 2015 05:26:13 GMT", "version": "v2" } ]
2015-03-06
[ [ "Dong", "Li", "" ], [ "Wei", "Furu", "" ], [ "Liu", "Shujie", "" ], [ "Zhou", "Ming", "" ], [ "Xu", "Ke", "" ] ]
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1401.6333
Yang Yu
Yang Yu and Hong Qian
The Sampling-and-Learning Framework: A Statistical View of Evolutionary Algorithms
null
null
null
null
cs.NE cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Evolutionary algorithms (EAs), a large class of general purpose optimization algorithms inspired from the natural phenomena, are widely used in various industrial optimizations and often show excellent performance. This paper presents an attempt towards revealing their general power from a statistical view of EAs. By summarizing a large range of EAs into the sampling-and-learning framework, we show that the framework directly admits a general analysis on the probable-absolute-approximate (PAA) query complexity. We particularly focus on the framework with the learning subroutine being restricted as a binary classification, which results in the sampling-and-classification (SAC) algorithms. With the help of the learning theory, we obtain a general upper bound on the PAA query complexity of SAC algorithms. We further compare SAC algorithms with the uniform search in different situations. Under the error-target independence condition, we show that SAC algorithms can achieve polynomial speedup to the uniform search, but not super-polynomial speedup. Under the one-side-error condition, we show that super-polynomial speedup can be achieved. This work only touches the surface of the framework. Its power under other conditions is still open.
[ { "created": "Fri, 24 Jan 2014 13:10:11 GMT", "version": "v1" }, { "created": "Fri, 11 Apr 2014 14:29:27 GMT", "version": "v2" } ]
2014-04-14
[ [ "Yu", "Yang", "" ], [ "Qian", "Hong", "" ] ]
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1401.6334
Anna Mrozik Mrs
Anna Mrozik, Pawe{\l} Bilski, Barbara Marczewska, Barbara Obryk, Krzysztof Hodyr and Wojciech Gieszczyk
Radio-photoluminescence of highly irradiated LiF:Mg,Ti and LiF:Mg,Cu,P detectors
The manuscript was submitted for publication in the Special Issue of Radiation Measurements. The SSD17 manuscript presented during Poster Session
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physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The radio-photoluminescent (RPL) characteristics of LiF:Mg,Ti (MTS) and LiF:Mg,Cu,P (MCP) thermoluminescent detectors, routinely used in radiation protection dosimetry, were investigated after irradiation with ultra-high electron doses ranging up to 1 MGy. The photoluminescence of both types of LiF detectors was stimulated by a blue light (460 nm) and measured within a spectral window around 530 nm. The RPL dose response was found to be linear up to 50 kGy and sublinear in the range of 50 kGy to 1 MGy for MCP detectors and linear up to 3 kGy and next sublinear in the range from 5 kGy to 1 MGy for MTS detectors. For both type of LiF detectors RPL signal is saturated for doses higher than 100 kGy. The observed differences between MCP and MTS may suggest, that the RPL effect in LiF is not entirely governed by intrinsic defects (F2 and F3+ centers), but impurities may also have a significant influence. Due to the non-destructive character of the RPL measurement, it is suggested to apply combined RPL/TL readouts, what should improve accuracy of high-dose dosimetry.
[ { "created": "Fri, 24 Jan 2014 13:18:09 GMT", "version": "v1" } ]
2014-01-27
[ [ "Mrozik", "Anna", "" ], [ "Bilski", "Paweł", "" ], [ "Marczewska", "Barbara", "" ], [ "Obryk", "Barbara", "" ], [ "Hodyr", "Krzysztof", "" ], [ "Gieszczyk", "Wojciech", "" ] ]
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1401.6335
Klas Markstr\"om
Klas Markstr\"om
From the Ising and Potts models to the general graph homomorphism polynomial
V2. Extended version
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math.CO cond-mat.stat-mech cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this note we study some of the properties of the generating polynomial for homomorphisms from a graph to at complete weighted graph on $q$ vertices. We discuss how this polynomial relates to a long list of other well known graph polynomials and the partition functions for different spin models, many of which are specialisations of the homomorphism polynomial. We also identify the smallest graphs which are not determined by their homomorphism polynomials for $q=2$ and $q=3$ and compare this with the corresponding minimal examples for the $U$-polynomial, which generalizes the well known Tutte-polynomal.
[ { "created": "Fri, 24 Jan 2014 13:18:36 GMT", "version": "v1" }, { "created": "Thu, 19 Nov 2015 19:33:12 GMT", "version": "v2" } ]
2015-11-20
[ [ "Markström", "Klas", "" ] ]
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1401.6336
Jean-Marc Kelif
Jean-Marc Kelif, Stephane Senecal, Constant Bridon, Marceau Coupechoux
A Fluid Approach for Poisson Wireless Networks
6 pages, 7 figures
null
null
null
cs.IT cs.NI math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Among the different models of networks usually considered, the hexagonal network model is the most popular. However, it requires extensive numerical computations. The Poisson network model, for which the base stations (BS) locations form a spatial Poisson process, allows to consider a non constant distance between base stations. Therefore, it may characterize more realistically operational networks. The Fluid network model, for which the interfering BS are replaced by a continuum of infinitesimal interferers, allows to establish closed-form formula for the SINR (Signal on Interference plus Noise Ratio). This model was validated by comparison with an hexagonal network. The two models establish very close results. As a consequence, the Fluid network model can be used to analyze hexagonal networks. In this paper, we show that the Fluid network model can also be used to analyze Poisson networks. Therefore, the analysis of performance and quality of service becomes very easy, whatever the type of network model, by using the analytical expression of the SINR established by considering the Fluid network model.
[ { "created": "Fri, 24 Jan 2014 13:25:03 GMT", "version": "v1" } ]
2014-01-27
[ [ "Kelif", "Jean-Marc", "" ], [ "Senecal", "Stephane", "" ], [ "Bridon", "Constant", "" ], [ "Coupechoux", "Marceau", "" ] ]
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1401.6338
Christoph Bunte
Christoph Bunte and Amos Lapidoth
Encoding Tasks and R\'enyi Entropy
12 pages; accepted for publication in the IEEE Transactions on Information Theory; minor changes in the presentation; added a section on tasks with costs; presented in part at ITW 2013; to be presented in part at ISIT 2014
null
10.1109/TIT.2014.2329490
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A task is randomly drawn from a finite set of tasks and is described using a fixed number of bits. All the tasks that share its description must be performed. Upper and lower bounds on the minimum $\rho$-th moment of the number of performed tasks are derived. The case where a sequence of tasks is produced by a source and $n$ tasks are jointly described using $nR$ bits is considered. If $R$ is larger than the R\'enyi entropy rate of the source of order $1/(1+\rho)$ (provided it exists), then the $\rho$-th moment of the ratio of performed tasks to $n$ can be driven to one as $n$ tends to infinity. If $R$ is smaller than the R\'enyi entropy rate, this moment tends to infinity. The results are generalized to account for the presence of side-information. In this more general setting, the key quantity is a conditional version of R\'enyi entropy that was introduced by Arimoto. For IID sources two additional extensions are solved, one of a rate-distortion flavor and the other where different tasks may have different nonnegative costs. Finally, a divergence that was identified by Sundaresan as a mismatch penalty in the Massey-Arikan guessing problem is shown to play a similar role here.
[ { "created": "Fri, 24 Jan 2014 13:53:57 GMT", "version": "v1" }, { "created": "Mon, 2 Jun 2014 12:55:33 GMT", "version": "v2" } ]
2014-10-07
[ [ "Bunte", "Christoph", "" ], [ "Lapidoth", "Amos", "" ] ]
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1401.6346
Zsuzsanna Lipt\'ak
P\'eter Burcsi and Gabriele Fici and Zsuzsanna Lipt\'ak and Frank Ruskey and Joe Sawada
On Combinatorial Generation of Prefix Normal Words
12 pages, 5 figures
Combinatorial Pattern Matching 2014, LNCS 8464, 60-69
10.1007/978-3-319-07566-2_7
null
cs.DS cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A prefix normal word is a binary word with the property that no substring has more 1s than the prefix of the same length. This class of words is important in the context of binary jumbled pattern matching. In this paper we present an efficient algorithm for exhaustively listing the prefix normal words with a fixed length. The algorithm is based on the fact that the language of prefix normal words is a bubble language, a class of binary languages with the property that, for any word w in the language, exchanging the first occurrence of 01 by 10 in w results in another word in the language. We prove that each prefix normal word is produced in O(n) amortized time, and conjecture, based on experimental evidence, that the true amortized running time is O(polylog(n)).
[ { "created": "Fri, 24 Jan 2014 14:30:35 GMT", "version": "v1" } ]
2014-06-23
[ [ "Burcsi", "Péter", "" ], [ "Fici", "Gabriele", "" ], [ "Lipták", "Zsuzsanna", "" ], [ "Ruskey", "Frank", "" ], [ "Sawada", "Joe", "" ] ]
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1401.6347
Daniel R\"osch
Daniel R\"osch, Stefan Willitsch, Yuan-Pin Chang, Jochen K\"upper
Chemical reactions of conformationally selected molecules in a beam with Coulomb-crystallized ions
12 pages, 11 figures
J. Chem. Phys. 140, 124202 (2014)
10.1063/1.4869100
null
physics.chem-ph physics.atm-clus
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Many molecules exhibit multiple conformers that often easily interconvert under thermal conditions. Therefore, single conformations are difficult to isolate which renders the study of their distinct chemical reactivities challenging. We have recently reported a new experimental method for the characterization of conformer-specific effects in chemical reactions [Y. P. Chang et al., Science 342, 98 (2013)]. Different conformers are spatially separated using inhomogeneous electric fields and reacted with a Coulomb crystal of cold, spatially localized ions in a trap. As a first application, we studied reactions between the two conformers of 3-aminophenol and Ca$^+$. We observed a twofold larger rate constant for the $cis$ compared to the $trans$ conformer which was rationalized in terms of the differences in the long-range ion-molecule interactions. The present article provides a detailed description of the new method and a full account of the experimental results as well as the accompanying theoretical calculations.
[ { "created": "Fri, 24 Jan 2014 14:32:33 GMT", "version": "v1" } ]
2014-03-31
[ [ "Rösch", "Daniel", "" ], [ "Willitsch", "Stefan", "" ], [ "Chang", "Yuan-Pin", "" ], [ "Küpper", "Jochen", "" ] ]
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1401.6348
Atif Khan
Atif Ali Khan, Oumair Naseer
Fuzzy Logic Based Multi User Adaptive Test System
Published online: Aug 20, 2012
International Journal of Soft Computing And Software Engineering (JSCSE), e-ISSN: 2251-7545, Vol. 2, no. 8, 2012
10.7321/jscse.v2.n8.1
null
cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The present proliferation of e-learning has been actively underway for the last 10 years. Current research in Adaptive Testing System focuses on the development of psychometric models with items selection strategies applicable to adaptive testing processes. The key aspect of proposed Adaptive Testing System is to develop an increasingly sophisticated latent trait model which can assist users in developing and enhancing their skills. Computerized Adaptive Test (CAT) System requires a lot of investment in time and effort to develop analyze and administrate an adaptive test. In this paper a fuzzy logic based Multi User Adaptive Test System (MUATS) is developed. Which is a Short Messaging Service (SMS) based System, currently integrated with GSM network based on the new psychometric model in education assessment. MUATS is not only a platform independent Adaptive Test System but also it eases the evaluation effort for adaptive test process. It further uses fuzzy logic to pick the most appropriate question from the pool of database for a specific user to be asked which makes the overall system an intelligent one.
[ { "created": "Fri, 24 Jan 2014 14:33:26 GMT", "version": "v1" } ]
2014-01-27
[ [ "Khan", "Atif Ali", "" ], [ "Naseer", "Oumair", "" ] ]
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1401.6351
Sergey Khrapak
S. A. Khrapak, A. G. Khrapak, A. V. Ivlev, and G. E. Morfill
Simple estimation of thermodynamic properties of Yukawa systems
To be published in Phys. Rev. E
Phys. Rev. E 89, 023102 (2014)
10.1103/PhysRevE.89.023102
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A simple analytical approach to estimate thermodynamic properties of model Yukawa systems is presented. The approach extends the traditional Debye-H\"{u}ckel theory into the regime of moderate coupling and is able to qualitatively reproduce thermodynamics of Yukawa systems up to the fluid-solid phase transition. The simplistic equation of state (pressure equation) is derived and applied to the hydrodynamic description of the longitudinal waves in Yukawa fluids. The relevance of this study to the topic of complex (dusty) plasmas is discussed.
[ { "created": "Fri, 24 Jan 2014 14:37:00 GMT", "version": "v1" } ]
2014-02-13
[ [ "Khrapak", "S. A.", "" ], [ "Khrapak", "A. G.", "" ], [ "Ivlev", "A. V.", "" ], [ "Morfill", "G. E.", "" ] ]
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1401.6352
Dmitry Zezyulin
Vladimir V. Konotop and Dmitry A. Zezyulin
Stochastic ${\cal PT}$-symmetric coupler
5 pages, 3 figures; accepted to Optics Letters
Optics Letters 39, 1223-1226 (2014)
10.1364/OL.39.001223
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a stochastic ${\cal PT}$-symmetric coupler, which is based on dual-core waveguides with fluctuating parameters, such that the gain and the losses are exactly balanced in average. We consider different parametric regimes which correspond to the broken and unbroken ${\cal PT}$ symmetry, as well as to the exceptional point of the underlying deterministic system. We demonstrate that in all the cases the statistically averaged intensity of the field grows. This result holds for either linear or nonlinear coupler and is independent on the type of fluctuations.
[ { "created": "Fri, 24 Jan 2014 14:38:26 GMT", "version": "v1" } ]
2014-02-24
[ [ "Konotop", "Vladimir V.", "" ], [ "Zezyulin", "Dmitry A.", "" ] ]
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1401.6354
Karin Schnass
Karin Schnass
Local Identification of Overcomplete Dictionaries
32 pages, 2 figures, final version accepted to JMLR
null
null
null
cs.IT math.IT stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents the first theoretical results showing that stable identification of overcomplete $\mu$-coherent dictionaries $\Phi \in \mathbb{R}^{d\times K}$ is locally possible from training signals with sparsity levels $S$ up to the order $O(\mu^{-2})$ and signal to noise ratios up to $O(\sqrt{d})$. In particular the dictionary is recoverable as the local maximum of a new maximisation criterion that generalises the K-means criterion. For this maximisation criterion results for asymptotic exact recovery for sparsity levels up to $O(\mu^{-1})$ and stable recovery for sparsity levels up to $O(\mu^{-2})$ as well as signal to noise ratios up to $O(\sqrt{d})$ are provided. These asymptotic results translate to finite sample size recovery results with high probability as long as the sample size $N$ scales as $O(K^3dS \tilde \varepsilon^{-2})$, where the recovery precision $\tilde \varepsilon$ can go down to the asymptotically achievable precision. Further, to actually find the local maxima of the new criterion, a very simple Iterative Thresholding and K (signed) Means algorithm (ITKM), which has complexity $O(dKN)$ in each iteration, is presented and its local efficiency is demonstrated in several experiments.
[ { "created": "Fri, 24 Jan 2014 14:41:31 GMT", "version": "v1" }, { "created": "Thu, 2 Apr 2015 13:37:23 GMT", "version": "v2" } ]
2015-04-03
[ [ "Schnass", "Karin", "" ] ]
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1401.6356
Wojciech Gieszczyk Ph.D.
P. Bilski, W. Gieszczyk, B. Obryk, K. Hodyr
Comparison of commercial thermoluminescent readers regarding high-dose high-temperature measurements
Data contained within this manuscript have been presented during the 1st International Conference on Dosimetry and its Applications, Prague, Czech Republic, 23-28 June 2013
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null
null
physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Three different thermoluminescent measuring systems have been compared with respect to the differences in temperature profiles, spectral sensitivities, as well as linearity of dose response characteristics. The comparison was performed using the Harshaw 3500, Riso DA-20 and RA94 TLD readers. The instruments were tested for the readouts of highly irradiated LiF:Mg,Cu,P (MCP) TL detectors, which require readout up to 550 C, in case of doses exceeding 1 kGy. It was found that the Harshaw 3500 can be used, without any additional light attenuation, for the measurements of MCP detectors exposed to doses up to about 5 Gy. For the other two readers the upper dose limit is about 5 times lower. It was also found that the Harshaw 3500 shows the best thermal stability considering the peak maximum position. For the ultra-high doses the differences in the spectral characteristics of the applied optical filters and photomultipliers, in conjunction with an evolution of the MCP TL emission spectrum with increasing dose, significantly influence the shape of TL glow curves measured with the Riso reader. The detailed characteristic of the compared TLD readers, at high-dose high-temperature range is discussed.
[ { "created": "Fri, 24 Jan 2014 14:44:19 GMT", "version": "v1" }, { "created": "Tue, 25 Feb 2014 08:14:00 GMT", "version": "v2" } ]
2014-02-26
[ [ "Bilski", "P.", "" ], [ "Gieszczyk", "W.", "" ], [ "Obryk", "B.", "" ], [ "Hodyr", "K.", "" ] ]
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1401.6359
Daniel Gor\'in
Daniel Gor\'in and Lutz Schr\"oder
Subsumption Checking in Conjunctive Coalgebraic Fixpoint Logics
null
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
While reasoning in a logic extending a complete Boolean basis is coNP-hard, restricting to conjunctive fragments of modal languages sometimes allows for tractable reasoning even in the presence of greatest fixpoints. One such example is the EL family of description logics; here, efficient reasoning is based on satisfaction checking in suitable small models that characterize formulas in terms of simulations. It is well-known, though, that not every conjunctive modal language has a tractable reasoning problem. Natural questions are then how common such tractable fragments are and how to identify them. In this work we provide sufficient conditions for tractability in a general way by considering unlabeled tableau rules for a given modal logic. We work in the framework of coalgebraic logic as a unifying semantic setting. Apart from recovering known results for description logics such as EL and FL0, we obtain new ones for conjunctive fragments of relational and non-relational modal logics with greatest fixpoints. Most notably we find tractable fragments of game logic and the alternating-time mu-calculus.
[ { "created": "Fri, 24 Jan 2014 14:50:44 GMT", "version": "v1" }, { "created": "Fri, 14 Feb 2014 10:29:38 GMT", "version": "v2" }, { "created": "Fri, 11 Apr 2014 07:09:19 GMT", "version": "v3" }, { "created": "Mon, 21 Apr 2014 19:39:39 GMT", "version": "v4" }, { "created": "Fri, 6 Jun 2014 12:02:36 GMT", "version": "v5" } ]
2014-06-09
[ [ "Gorín", "Daniel", "" ], [ "Schröder", "Lutz", "" ] ]
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1401.6360
Luc Bouganim
Niv Dayan (IT), Martin Kjaer Svendsen (IT), Matias Bjorling, Philippe Bonnet (IT), Luc Bouganim (PRISM, INRIA Rocquencourt)
EagleTree: Exploring the Design Space of SSD-Based Algorithms
39th International Conference on Very Large Data Bases (VLDB) (2013)
null
null
null
cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Solid State Drives (SSDs) are a moving target for system designers: they are black boxes, their internals are undocumented, and their performance characteristics vary across models. There is no appropriate analytical model and experimenting with commercial SSDs is cumbersome, as it requires a careful experimental methodology to ensure repeatability. Worse, performance results obtained on a given SSD cannot be generalized. Overall, it is impossible to explore how a given algorithm, say a hash join or LSM-tree insertions, leverages the intrinsic parallelism of a modern SSD, or how a slight change in the internals of an SSD would impact its overall performance. In this paper, we propose a new SSD simulation framework, named EagleTree, which addresses these problems, and enables a principled study of SSD-Based algorithms. The demonstration scenario illustrates the design space for algorithms based on an SSD-based IO stack, and shows how researchers and practitioners can use EagleTree to perform tractable explorations of this complex design space.
[ { "created": "Fri, 24 Jan 2014 14:54:41 GMT", "version": "v1" } ]
2014-01-27
[ [ "Dayan", "Niv", "", "IT" ], [ "Svendsen", "Martin Kjaer", "", "IT" ], [ "Bjorling", "Matias", "", "IT" ], [ "Bonnet", "Philippe", "", "IT" ], [ "Bouganim", "Luc", "", "PRISM, INRIA Rocquencourt" ] ]
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1401.6361
Michel Kieffer
Nesrine Changuel, Bessem Sayadi, Michel Kieffer (LTCI, IUF)
Control of Multiple Remote Servers for Quality-Fair Delivery of Multimedia Contents
null
null
null
null
cs.MM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper proposes a control scheme for the quality-fair delivery of several encoded video streams to mobile users sharing a common wireless resource. Video quality fairness, as well as similar delivery delays are targeted among streams. The proposed controller is implemented within some aggregator located near the bottleneck of the network. The transmission rate among streams is adapted based on the quality of the already encoded and buffered packets in the aggregator. Encoding rate targets are evaluated by the aggregator and fed back to each remote video server (fully centralized solution), or directly evaluated by each server in a distributed way (partially distributed solution). Each encoding rate target is adjusted for each stream independently based on the corresponding buffer level or buffering delay in the aggregator. Communication delays between the servers and the aggregator are taken into account. The transmission and encoding rate control problems are studied with a control-theoretic perspective. The system is described with a multi-input multi-output model. Proportional Integral (PI) controllers are used to adjust the video quality and control the aggregator buffer levels. The system equilibrium and stability properties are studied. This provides guidelines for choosing the parameters of the PI controllers. Experimental results show the convergence of the proposed control system and demonstrate the improvement in video quality fairness compared to a classical transmission rate fair streaming solution and to a utility max-min fair approach.
[ { "created": "Fri, 24 Jan 2014 14:56:42 GMT", "version": "v1" } ]
2014-01-27
[ [ "Changuel", "Nesrine", "", "LTCI, IUF" ], [ "Sayadi", "Bessem", "", "LTCI, IUF" ], [ "Kieffer", "Michel", "", "LTCI, IUF" ] ]
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1401.6362
Zhang Shengli
Shengli Zhang, Soung-Chang Liew and Jinyuan Chen
The Capacity of Known Interference Channel (updated)
10 pages
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we investigate the capacity of known interference channel, where the receiver knows the interference data but not the channel gain of the interference data. We first derive a tight upper bound for the capacity of this known-interference channel. After that, we obtain an achievable rate of the channel with a blind known interference cancellation (BKIC) scheme in closed form. We prove that the aforementioned upper bound in the high SNR regime can be approached by our achievable rate. Moreover, the achievable rate of our BKIC scheme is much larger than that of the traditional interference cancellation scheme. In particular, the achievable rate of BKIC continues to increase with SNR in the high SNR regime (non-zero degree of freedom), while that of the traditional scheme approaches a fixed bound that does not improve with SNR (zero degree of freedom).
[ { "created": "Fri, 24 Jan 2014 14:59:04 GMT", "version": "v1" }, { "created": "Thu, 13 Feb 2014 02:47:12 GMT", "version": "v2" }, { "created": "Thu, 11 Sep 2014 23:26:30 GMT", "version": "v3" } ]
2014-09-15
[ [ "Zhang", "Shengli", "" ], [ "Liew", "Soung-Chang", "" ], [ "Chen", "Jinyuan", "" ] ]
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1401.6363
Xin Li
Xin Li and Zhe Chang
Exact solution of vacuum field equation in Finsler spacetime
25 pages
null
10.1103/PhysRevD.90.064049
null
physics.gen-ph
http://creativecommons.org/licenses/by/4.0/
We suggest that the vacuum field equation in Finsler spacetime is equivalent to vanishing of Ricci scalar. Schwarzschild metric can be deduced from a solution of our field equation if the spacetime preserve spherical symmetry. Supposing spacetime to preserve the symmetry of "Finslerian sphere", we find a non-Riemannian exact solution of the Finslerian vacuum field equation. The solution is similar to the Schwarzschild metric. It reduces to Schwarzschild metric while the Finslerian parameter $\epsilon$ vanishes. It is proved that the Finslerian covariant derivative of the geometrical part of the gravitational field equation is conserved. The interior solution is also given. We get solutions of geodesic equation in such a Schwarzschild-like spacetime, and show that the geodesic equation returns to the counterpart in Newton's gravity at weak field approximation. The celestial observations give constraint on the Finslerian parameter $\epsilon<10^{-4}$. And the recent Michelson-Morley experiment requires $\epsilon<10^{-16}$. The counterpart of Birkhoff's theorem exist in Finslerian vacuum. It shows that the Finslerian gravitational field with the symmetry of "Finslerian sphere" in vacuum must be static.
[ { "created": "Thu, 23 Jan 2014 14:28:06 GMT", "version": "v1" }, { "created": "Thu, 10 May 2018 15:45:51 GMT", "version": "v2" } ]
2018-05-11
[ [ "Li", "Xin", "" ], [ "Chang", "Zhe", "" ] ]
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1401.6365
Behnam Faghih
Behnam Faghih, Dr. Mohammad Reza Azadehfar, Prof. S. D. Katebi
User Interface Design for E-Learning Software
9 pages
International Journal of Soft Computing and Software Engineering [JSCSE], Vol. 3, No. 3, pp. 786-794, 2013
10.7321/jscse.v3.n3.119
null
cs.CY cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
User interface (UI) is point of interaction between user and computer software. The success and failure of a software application depends on User Interface Design (UID). Possibility of using a software, easily using and learning are issues influenced by UID. The UI is significant in designing of educational software (e-Learning). Principles and concepts of learning should be considered in addition to UID principles in UID for e-learning. In this regard, to specify the logical relationship between education, learning, UID and multimedia at first we readdress the issues raised in previous studies. It is followed by examining the principle concepts of e-learning and UID. Then, we will see how UID contributes to e-learning through the educational software built by authors. Also we show the way of using UI to improve learning and motivating the learners and to improve the time efficiency of using e-learning software.
[ { "created": "Fri, 24 Jan 2014 15:04:05 GMT", "version": "v1" } ]
2014-01-27
[ [ "Faghih", "Behnam", "" ], [ "Azadehfar", "Dr. Mohammad Reza", "" ], [ "Katebi", "Prof. S. D.", "" ] ]
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1401.6370
Haipeng Zhang Ph.D.
Haipeng Zhang, Lingjun Kong, Xiuju Huang, Mengmeng Cao
Design of a High Speed XAUI Based on Dynamic Reconfigurable Transceiver IP Core
10 pages, 5 figures, 5 tables, 14 references
International Journal of Soft Computing And Software Engineering (JSCSE) Vol.2,No.9, 2012 Published online: Sep 25, 2012
10.7321/jscse.v2.n9.4
null
cs.AR
http://creativecommons.org/licenses/by-nc-sa/3.0/
By using the dynamic reconfigurable transceiver in high speed interface design, designer can solve critical technology problems such as ensuring signal integrity conveniently, with lower error binary rate. In this paper, we designed a high speed XAUI (10Gbps Ethernet Attachment Unit Interface) to transparently extend the physical reach of the XGMII. The following points are focused: (1) IP (Intellectual Property) core usage. Altera Co. offers two transceiver IP cores in Quartus II MegaWizard Plug-In Manager for XAUI design which is featured of dynamic reconfiguration performance, that is, ALTGX_RECO?FIG instance and ALTGX instance, we can get various groups by changing settings of the devices without power off. These two blocks can accomplish function of PCS (Physical Coding Sub-layer) and PMA (Physical Medium Attachment), however, with higher efficiency and reliability. (2) 1+1 protection. In our design, two ALTGX IP cores are used to work in parallel, which named XAUI0 and XAUI1. The former works as the main channel while the latter redundant channel. When XAUI0 is out of service for some reasons, XAUI1 will start to work to keep the business. (3) RTL (Register Transfer Level) coding with Verilog HDL and simulation. Create the ALTGX_RECO?FIG instance and ALTGX instance, enable dynamic reconfiguration in the ALTGXB Megafunction, then connect the ALTGX_RECO?FIG with the ALTGX instances. After RTL coding, the design was simulated on VCS simulator. The validated result indicates that the packets are transferred efficiently. FPGA makes high-speed optical communication system design simplified.
[ { "created": "Fri, 24 Jan 2014 15:14:52 GMT", "version": "v1" } ]
2014-01-27
[ [ "Zhang", "Haipeng", "" ], [ "Kong", "Lingjun", "" ], [ "Huang", "Xiuju", "" ], [ "Cao", "Mengmeng", "" ] ]
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1401.6375
Haipeng Zhang Ph.D.
Yixin Liu, Haipeng Zhang, Tao Feng
Design of an Encryption-Decryption Module Oriented for Internet Information Security SOC Design
11 pages, 5 figures, 4 tables, 14 references
International Journal of Soft Computing And Software Engineering (JSCSE),Vol.2,No.7, 2012
10.7321/jscse.v2.n7.3
null
cs.AR cs.CR
http://creativecommons.org/licenses/by-nc-sa/3.0/
In order to protect the security of network data, a high speed chip module for encrypting and decrypting of network data packet is designed. The chip module is oriented for internet information security SOC (System on Chip) design. During the design process, AES (Advanced Encryption Standard) and 3DES (Data Encryption Standard) encryption algorithm are adopted to protect the security of network data. The following points are focused: (1) The SOC (System on Chip) design methodology based on IP (Intellectual Property) core is used. AES (Advanced Encryption Standard) and 3DES (Data Encryption Standard) IP (Intellectual Property) cores are embedded in the chip module, peripheral control sub-modules are designed to control the encryption-decryption module, which is capable of shortening the design period of the chip module. (2) The implementation of encryption-decryption with hardware was presented, which improves the safety of data through the encryption-decryption chip and reduce the load of CPU. (3) In our hardware solution, two AES (Advanced Encryption Standard) cores are used to work in parallel, which improves the speed of the encryption module. Moreover, the key length of AES (Advanced Encryption Standard) encryption algorithm is designed with three optional configurations at 128 bits, 256 bits and 192 bits respectively and six optional encryption algorithm modes: CBC (Cipher Block Chaining) mode, ECB (Electronic Code Book) mode, GCM (Galois/Counter Mode) mode, XTS(cipherteXT Stealing) mode, CTR (CounTeR) mode and 3DES respectively, which adds the flexibility to its applications.
[ { "created": "Fri, 24 Jan 2014 15:29:06 GMT", "version": "v1" } ]
2014-01-27
[ [ "Liu", "Yixin", "" ], [ "Zhang", "Haipeng", "" ], [ "Feng", "Tao", "" ] ]
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1401.6376
Jie Chen
Jie Chen and Jos\'e Carlos M. Bermudez and C\'edric Richard
Steady-state performance of non-negative least-mean-square algorithm and its variants
10 pages, 4 figures
null
10.1109/LSP.2014.2320944
null
cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Non-negative least-mean-square (NNLMS) algorithm and its variants have been proposed for online estimation under non-negativity constraints. The transient behavior of the NNLMS, Normalized NNLMS, Exponential NNLMS and Sign-Sign NNLMS algorithms have been studied in our previous work. In this technical report, we derive closed-form expressions for the steady-state excess mean-square error (EMSE) for the four algorithms. Simulations results illustrate the accuracy of the theoretical results. This is a complementary material to our previous work.
[ { "created": "Fri, 24 Jan 2014 15:36:09 GMT", "version": "v1" } ]
2015-06-18
[ [ "Chen", "Jie", "" ], [ "Bermudez", "José Carlos M.", "" ], [ "Richard", "Cédric", "" ] ]
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1401.6380
Francesco Caltagirone
Francesco Caltagirone and Lenka Zdeborov\'a
Properties of spatial coupling in compressed sensing
5 pages, 6 figures
null
null
null
cs.IT cond-mat.stat-mech math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we address a series of open questions about the construction of spatially coupled measurement matrices in compressed sensing. For hardware implementations one is forced to depart from the limiting regime of parameters in which the proofs of the so-called threshold saturation work. We investigate quantitatively the behavior under finite coupling range, the dependence on the shape of the coupling interaction, and optimization of the so-called seed to minimize distance from optimality. Our analysis explains some of the properties observed empirically in previous works and provides new insight on spatially coupled compressed sensing.
[ { "created": "Fri, 24 Jan 2014 15:41:58 GMT", "version": "v1" } ]
2014-01-27
[ [ "Caltagirone", "Francesco", "" ], [ "Zdeborová", "Lenka", "" ] ]
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1401.6384
Francesco Caltagirone
Francesco Caltagirone, Florent Krzakala and Lenka Zdeborov\'a
On Convergence of Approximate Message Passing
5 pages, 3 figures
Information Theory Proceedings (ISIT), 2014 IEEE International Symposium on, page(s) 1812-1816
10.1109/ISIT.2014.6875146
null
cs.IT cond-mat.stat-mech math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Approximate message passing is an iterative algorithm for compressed sensing and related applications. A solid theory about the performance and convergence of the algorithm exists for measurement matrices having iid entries of zero mean. However, it was observed by several authors that for more general matrices the algorithm often encounters convergence problems. In this paper we identify the reason of the non-convergence for measurement matrices with iid entries and non-zero mean in the context of Bayes optimal inference. Finally we demonstrate numerically that when the iterative update is changed from parallel to sequential the convergence is restored.
[ { "created": "Fri, 24 Jan 2014 15:53:19 GMT", "version": "v1" } ]
2014-10-03
[ [ "Caltagirone", "Francesco", "" ], [ "Krzakala", "Florent", "" ], [ "Zdeborová", "Lenka", "" ] ]
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1401.6385
Songjian Lu
Songjian Lu, Xinghua Lu
An exact algorithm for the weighed mutually exclusive maximum set cover problem
null
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we introduce an exact algorithm with a time complexity of $O^*(1.325^m)$ for the {\sc weighted mutually exclusive maximum set cover} problem, where $m$ is the number of subsets in the problem. This is an NP-hard motivated and abstracted from a bioinformatics problem of identifying signaling pathways based gene mutations. Currently, this problem is addressed using heuristic algorithms, which cannot guarantee the performance of the solution. By providing a relatively efficient exact algorithm, our approach will like increase the capability of finding better solutions in the application of cancer research.
[ { "created": "Fri, 24 Jan 2014 16:00:34 GMT", "version": "v1" } ]
2014-01-27
[ [ "Lu", "Songjian", "" ], [ "Lu", "Xinghua", "" ] ]
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1401.6393
Radu Horaud P
Miles Hansard, Radu Horaud, Michel Amat, Georgios Evangelidis
Automatic Detection of Calibration Grids in Time-of-Flight Images
11 pages, 11 figures, 1 table
Computer Vision and Image Understanding, 121, 2014
10.1016/j.cviu.2014.01.007
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is convenient to calibrate time-of-flight cameras by established methods, using images of a chequerboard pattern. The low resolution of the amplitude image, however, makes it difficult to detect the board reliably. Heuristic detection methods, based on connected image-components, perform very poorly on this data. An alternative, geometrically-principled method is introduced here, based on the Hough transform. The projection of a chequerboard is represented by two pencils of lines, which are identified as oriented clusters in the gradient-data of the image. A projective Hough transform is applied to each of the two clusters, in axis-aligned coordinates. The range of each transform is properly bounded, because the corresponding gradient vectors are approximately parallel. Each of the two transforms contains a series of collinear peaks; one for every line in the given pencil. This pattern is easily detected, by sweeping a dual line through the transform. The proposed Hough-based method is compared to the standard OpenCV detection routine, by application to several hundred time-of-flight images. It is shown that the new method detects significantly more calibration boards, over a greater variety of poses, without any overall loss of accuracy. This conclusion is based on an analysis of both geometric and photometric error.
[ { "created": "Fri, 24 Jan 2014 16:25:56 GMT", "version": "v1" } ]
2020-12-18
[ [ "Hansard", "Miles", "" ], [ "Horaud", "Radu", "" ], [ "Amat", "Michel", "" ], [ "Evangelidis", "Georgios", "" ] ]
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1401.6396
Majid Zamani
Majid Zamani, Manuel Mazo Jr, Mahmoud Khaled, Alessandro Abate
Symbolic Abstractions of Networked Control Systems
22 pages, 8 figures, 1 table
null
null
null
math.OC cs.FL cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The last decade has witnessed significant attention on networked control systems (NCS) due to their ubiquitous presence in industrial applications, and, in the particular case of wireless NCS, because of their architectural flexibility and low installation and maintenance costs. In wireless NCS the communication between sensors, controllers, and actuators is supported by a communication channel that is likely to introduce variable communication delays, packet losses, limited bandwidth, and other practical non-idealities leading to numerous technical challenges. Although stability properties of NCS have been investigated extensively in the literature, results for NCS under more complex and general objectives, and in particular results dealing with verification or controller synthesis for logical specifications, are much more limited. This work investigates how to address such complex objectives by constructively deriving symbolic models of NCS, while encompassing the mentioned network non-idealities. The obtained abstracted (symbolic) models can then be employed to synthesize hybrid controllers enforcing rich logical specifications over the concrete NCS models. Examples of such general specifications include properties expressed as formulae in linear temporal logic (LTL) or as automata on infinite strings. We thus provide a general synthesis framework that can be flexibly adapted to a number of NCS setups. We illustrate the effectiveness of the results over some case studies.
[ { "created": "Fri, 24 Jan 2014 16:42:20 GMT", "version": "v1" }, { "created": "Wed, 9 Jul 2014 10:33:20 GMT", "version": "v2" }, { "created": "Wed, 16 Mar 2016 14:24:40 GMT", "version": "v3" }, { "created": "Mon, 21 Nov 2016 11:23:48 GMT", "version": "v4" } ]
2016-11-22
[ [ "Zamani", "Majid", "" ], [ "Mazo", "Manuel", "Jr" ], [ "Khaled", "Mahmoud", "" ], [ "Abate", "Alessandro", "" ] ]
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1401.6399
Daniel Lemire
Daniel Lemire, Leonid Boytsov, Nathan Kurz
SIMD Compression and the Intersection of Sorted Integers
null
Software: Practice and Experience Volume 46, Issue 6, pages 723-749, June 2016
10.1002/spe.2326
null
cs.IR cs.DB cs.PF
http://creativecommons.org/licenses/by/4.0/
Sorted lists of integers are commonly used in inverted indexes and database systems. They are often compressed in memory. We can use the SIMD instructions available in common processors to boost the speed of integer compression schemes. Our S4-BP128-D4 scheme uses as little as 0.7 CPU cycles per decoded integer while still providing state-of-the-art compression. However, if the subsequent processing of the integers is slow, the effort spent on optimizing decoding speed can be wasted. To show that it does not have to be so, we (1) vectorize and optimize the intersection of posting lists; (2) introduce the SIMD Galloping algorithm. We exploit the fact that one SIMD instruction can compare 4 pairs of integers at once. We experiment with two TREC text collections, GOV2 and ClueWeb09 (Category B), using logs from the TREC million-query track. We show that using only the SIMD instructions ubiquitous in all modern CPUs, our techniques for conjunctive queries can double the speed of a state-of-the-art approach.
[ { "created": "Fri, 24 Jan 2014 16:53:37 GMT", "version": "v1" }, { "created": "Fri, 6 Mar 2015 19:50:27 GMT", "version": "v10" }, { "created": "Thu, 12 Mar 2015 01:32:13 GMT", "version": "v11" }, { "created": "Thu, 7 May 2015 00:52:07 GMT", "version": "v12" }, { "created": "Mon, 20 Apr 2020 19:42:24 GMT", "version": "v13" }, { "created": "Mon, 27 Jan 2014 16:37:12 GMT", "version": "v2" }, { "created": "Tue, 4 Feb 2014 01:02:27 GMT", "version": "v3" }, { "created": "Thu, 27 Feb 2014 23:38:50 GMT", "version": "v4" }, { "created": "Mon, 28 Apr 2014 19:15:10 GMT", "version": "v5" }, { "created": "Thu, 15 May 2014 14:57:33 GMT", "version": "v6" }, { "created": "Thu, 17 Jul 2014 19:42:12 GMT", "version": "v7" }, { "created": "Wed, 23 Jul 2014 19:16:39 GMT", "version": "v8" }, { "created": "Wed, 24 Dec 2014 20:30:29 GMT", "version": "v9" } ]
2020-04-22
[ [ "Lemire", "Daniel", "" ], [ "Boytsov", "Leonid", "" ], [ "Kurz", "Nathan", "" ] ]
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SIMD Compression and the Intersection of Sorted Integers
http://arxiv.org/abs/1401.6399v12
http://arxiv.org/pdf/1401.6399v12.pdf
https://github.com/lemire/SIMDCompressionAndIntersection
true
true
https://paperswithcode.com/paper/simd-compression-and-the-intersection-of
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1401.6404
Ankit Sharma
Ankit Sharma, Jaideep Srivastava and Abhishek Chandra
Predicting Multi-actor collaborations using Hypergraphs
null
null
null
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Social networks are now ubiquitous and most of them contain interactions involving multiple actors (groups) like author collaborations, teams or emails in an organizations, etc. Hypergraphs are natural structures to effectively capture multi-actor interactions which conventional dyadic graphs fail to capture. In this work the problem of predicting collaborations is addressed while modeling the collaboration network as a hypergraph network. The problem of predicting future multi-actor collaboration is mapped to hyperedge prediction problem. Given that the higher order edge prediction is an inherently hard problem, in this work we restrict to the task of predicting edges (collaborations) that have already been observed in past. In this work, we propose a novel use of hyperincidence temporal tensors to capture time varying hypergraphs and provides a tensor decomposition based prediction algorithm. We quantitatively compare the performance of the hypergraphs based approach with the conventional dyadic graph based approach. Our hypothesis that hypergraphs preserve the information that simple graphs destroy is corroborated by experiments using author collaboration network from the DBLP dataset. Our results demonstrate the strength of hypergraph based approach to predict higher order collaborations (size>4) which is very difficult using dyadic graph based approach. Moreover, while predicting collaborations of size>2 hypergraphs in most cases provide better results with an average increase of approx. 45% in F-Score for different sizes = {3,4,5,6,7}.
[ { "created": "Fri, 24 Jan 2014 17:10:16 GMT", "version": "v1" } ]
2014-01-27
[ [ "Sharma", "Ankit", "" ], [ "Srivastava", "Jaideep", "" ], [ "Chandra", "Abhishek", "" ] ]
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1401.6406
Paul Dellar
Emma S. Warneford and Paul J. Dellar
Super- and sub-rotating equatorial jets: Newtonian cooling versus Rayleigh friction
20 pages, 28 figures, generates 3.4MB PDF
null
null
null
physics.flu-dyn astro-ph.EP physics.ao-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Numerical simulations of the shallow water equations on rotating spheres produce mixtures of robust vortices and alternating zonal jets, as seen in the atmospheres of the gas giant planets. However, simulations that include Rayleigh friction invariably produce a sub-rotating (retrograde) equatorial jet for Jovian parameter regimes, whilst observations of Jupiter show a super-rotating (prograde) equatorial jet that has persisted over several decades. Super-rotating equatorial jets have recently been obtained in shallow water simulations that include a Newtonian relaxation of perturbations to the layer thickness to model radiative cooling to space, and in simulations of the thermal shallow water equations that include a similar relaxation term in their temperature equation. Simulations of global quasigeostrophic forms of these different models produce equatorial jets in the same directions as the parent models, suggesting that the mechanism responsible for setting the direction lies within quasigeostrophic theory. We provide such a mechanism by calculating the effective force acting on the thickness-weighted zonal mean flow due to the decay of an equatorially trapped Rossby wave. Decay due to Newtonian cooling creates an eastward zonal mean flow at the equator, consistent with the formation of a super-rotating equatorial jet, while decay due to Rayleigh friction leads to a westward zonal mean flow at the equator, consistent with the formation of a sub-rotating equatorial jet. In both cases the meridionally integrated zonal mean of the absolute zonal momentum is westward, consistent with the standard result that Rossby waves carry westward pseudomomentum, but this does not preclude the zonal mean flow being eastward on and close to the equator.
[ { "created": "Fri, 24 Jan 2014 17:25:45 GMT", "version": "v1" }, { "created": "Wed, 4 Jan 2017 16:59:23 GMT", "version": "v2" } ]
2017-01-05
[ [ "Warneford", "Emma S.", "" ], [ "Dellar", "Paul J.", "" ] ]
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1401.6410
Christian Steinruecken
Christian Steinruecken
Compressing Sets and Multisets of Sequences
null
null
null
null
cs.IT math.IT stat.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This article describes lossless compression algorithms for multisets of sequences, taking advantage of the multiset's unordered structure. Multisets are a generalisation of sets where members are allowed to occur multiple times. A multiset can be encoded na\"ively by simply storing its elements in some sequential order, but then information is wasted on the ordering. We propose a technique that transforms the multiset into an order-invariant tree representation, and derive an arithmetic code that optimally compresses the tree. Our method achieves compression even if the sequences in the multiset are individually incompressible (such as cryptographic hash sums). The algorithm is demonstrated practically by compressing collections of SHA-1 hash sums, and multisets of arbitrary, individually encodable objects.
[ { "created": "Fri, 24 Jan 2014 17:36:32 GMT", "version": "v1" } ]
2014-01-27
[ [ "Steinruecken", "Christian", "" ] ]
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1401.6413
Nuri Denizcan Vanli
N. Denizcan Vanli, Muhammed O. Sayin, Suleyman S. Kozat
Predicting Nearly As Well As the Optimal Twice Differentiable Regressor
null
null
null
null
cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study nonlinear regression of real valued data in an individual sequence manner, where we provide results that are guaranteed to hold without any statistical assumptions. We address the convergence and undertraining issues of conventional nonlinear regression methods and introduce an algorithm that elegantly mitigates these issues via an incremental hierarchical structure, (i.e., via an incremental decision tree). Particularly, we present a piecewise linear (or nonlinear) regression algorithm that partitions the regressor space in a data driven manner and learns a linear model at each region. Unlike the conventional approaches, our algorithm gradually increases the number of disjoint partitions on the regressor space in a sequential manner according to the observed data. Through this data driven approach, our algorithm sequentially and asymptotically achieves the performance of the optimal twice differentiable regression function for any data sequence with an unknown and arbitrary length. The computational complexity of the introduced algorithm is only logarithmic in the data length under certain regularity conditions. We provide the explicit description of the algorithm and demonstrate the significant gains for the well-known benchmark real data sets and chaotic signals.
[ { "created": "Thu, 23 Jan 2014 15:51:36 GMT", "version": "v1" }, { "created": "Mon, 6 Oct 2014 23:32:10 GMT", "version": "v2" } ]
2014-10-08
[ [ "Vanli", "N. Denizcan", "" ], [ "Sayin", "Muhammed O.", "" ], [ "Kozat", "Suleyman S.", "" ] ]
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1401.6417
Rashad Moarref
R. Moarref and M. R. Jovanovic and J. A. Tropp and A. S. Sharma and B. J. McKeon
A low-order decomposition of turbulent channel flow via resolvent analysis and convex optimization
null
Phys. Fluids, 26: 051701, 2014
10.1063/1.4876195
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We combine resolvent-mode decomposition with techniques from convex optimization to optimally approximate velocity spectra in a turbulent channel. The velocity is expressed as a weighted sum of resolvent modes that are dynamically significant, non-empirical, and scalable with Reynolds number. To optimally represent DNS data at friction Reynolds number $2003$, we determine the weights of resolvent modes as the solution of a convex optimization problem. Using only $12$ modes per wall-parallel wavenumber pair and temporal frequency, we obtain close agreement with DNS-spectra, reducing the wall-normal and temporal resolutions used in the simulation by three orders of magnitude.
[ { "created": "Fri, 24 Jan 2014 18:25:28 GMT", "version": "v1" }, { "created": "Wed, 21 May 2014 06:13:13 GMT", "version": "v2" } ]
2014-05-22
[ [ "Moarref", "R.", "" ], [ "Jovanovic", "M. R.", "" ], [ "Tropp", "J. A.", "" ], [ "Sharma", "A. S.", "" ], [ "McKeon", "B. J.", "" ] ]
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1401.6420
Ronald Hochreiter
Ronald Hochreiter and Christoph Waldhauser
Zombie Politics: Evolutionary Algorithms to Counteract the Spread of Negative Opinions
null
null
null
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper is about simulating the spread of opinions in a society and about finding ways to counteract that spread. To abstract away from potentially emotionally laden opinions, we instead simulate the spread of a zombie outbreak in a society. The virus causing this outbreak is different from traditional approaches: it not only causes a binary outcome (healthy vs infected) but rather a continuous outcome. To counteract the outbreak, a discrete number of infection-level specific treatments is available. This corresponds to acts of mild persuasion or the threats of legal action in the opinion spreading use case. This paper offers a genetic and a cultural algorithm that find the optimal mixture of treatments during the run of the simulation. They are assessed in a number of different scenarios. It is shown, that albeit far from being perfect, the cultural algorithm delivers superior performance at lower computational expense.
[ { "created": "Wed, 22 Jan 2014 15:49:09 GMT", "version": "v1" } ]
2014-01-27
[ [ "Hochreiter", "Ronald", "" ], [ "Waldhauser", "Christoph", "" ] ]
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1401.6421
Jonathan Huang
Jonathan Huang, Ashish Kapoor, Carlos Guestrin
Riffled Independence for Efficient Inference with Partial Rankings
arXiv admin note: text overlap with arXiv:1202.3734
Journal Of Artificial Intelligence Research, Volume 44, pages 491-532, 2012
10.1613/jair.3543
null
cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Distributions over rankings are used to model data in a multitude of real world settings such as preference analysis and political elections. Modeling such distributions presents several computational challenges, however, due to the factorial size of the set of rankings over an item set. Some of these challenges are quite familiar to the artificial intelligence community, such as how to compactly represent a distribution over a combinatorially large space, and how to efficiently perform probabilistic inference with these representations. With respect to ranking, however, there is the additional challenge of what we refer to as human task complexity users are rarely willing to provide a full ranking over a long list of candidates, instead often preferring to provide partial ranking information. Simultaneously addressing all of these challenges i.e., designing a compactly representable model which is amenable to efficient inference and can be learned using partial ranking data is a difficult task, but is necessary if we would like to scale to problems with nontrivial size. In this paper, we show that the recently proposed riffled independence assumptions cleanly and efficiently address each of the above challenges. In particular, we establish a tight mathematical connection between the concepts of riffled independence and of partial rankings. This correspondence not only allows us to then develop efficient and exact algorithms for performing inference tasks using riffled independence based represen- tations with partial rankings, but somewhat surprisingly, also shows that efficient inference is not possible for riffle independent models (in a certain sense) with observations which do not take the form of partial rankings. Finally, using our inference algorithm, we introduce the first method for learning riffled independence based models from partially ranked data.
[ { "created": "Thu, 23 Jan 2014 02:42:39 GMT", "version": "v1" } ]
2014-01-27
[ [ "Huang", "Jonathan", "" ], [ "Kapoor", "Ashish", "" ], [ "Guestrin", "Carlos", "" ] ]
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1401.6422
Christina Sauper
Christina Sauper, Regina Barzilay
Automatic Aggregation by Joint Modeling of Aspects and Values
null
Journal Of Artificial Intelligence Research, Volume 46, pages 89-127, 2013
10.1613/jair.3647
null
cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a model for aggregation of product review snippets by joint aspect identification and sentiment analysis. Our model simultaneously identifies an underlying set of ratable aspects presented in the reviews of a product (e.g., sushi and miso for a Japanese restaurant) and determines the corresponding sentiment of each aspect. This approach directly enables discovery of highly-rated or inconsistent aspects of a product. Our generative model admits an efficient variational mean-field inference algorithm. It is also easily extensible, and we describe several modifications and their effects on model structure and inference. We test our model on two tasks, joint aspect identification and sentiment analysis on a set of Yelp reviews and aspect identification alone on a set of medical summaries. We evaluate the performance of the model on aspect identification, sentiment analysis, and per-word labeling accuracy. We demonstrate that our model outperforms applicable baselines by a considerable margin, yielding up to 32% relative error reduction on aspect identification and up to 20% relative error reduction on sentiment analysis.
[ { "created": "Thu, 23 Jan 2014 02:48:07 GMT", "version": "v1" } ]
2014-01-27
[ [ "Sauper", "Christina", "" ], [ "Barzilay", "Regina", "" ] ]
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1401.6423
Liu Hanlin
Hanlin Liu
A Algorithm for the Hamilton Circuit Problem
In this article, we try to find a algorithm for the hamilton circuit problem. Unfortunately, it can not cover all cases of hamilton circuit problem. So, it is a failed attempt
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cs.DS
http://creativecommons.org/licenses/by-nc-sa/3.0/
We proposed an algorithm that covers some cases of Hamilton Circuit Problem.
[ { "created": "Thu, 23 Jan 2014 12:56:05 GMT", "version": "v1" }, { "created": "Wed, 29 Jan 2014 04:35:33 GMT", "version": "v2" }, { "created": "Thu, 20 Feb 2014 16:59:58 GMT", "version": "v3" }, { "created": "Sat, 22 Feb 2014 16:47:04 GMT", "version": "v4" }, { "created": "Mon, 10 Mar 2014 14:27:54 GMT", "version": "v5" }, { "created": "Tue, 11 Mar 2014 05:34:46 GMT", "version": "v6" }, { "created": "Wed, 16 Apr 2014 11:12:47 GMT", "version": "v7" }, { "created": "Wed, 31 Oct 2018 10:45:21 GMT", "version": "v8" } ]
2018-11-01
[ [ "Liu", "Hanlin", "" ] ]
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1401.6424
Nico Goernitz
Nico Goernitz, Marius Micha Kloft, Konrad Rieck, Ulf Brefeld
Toward Supervised Anomaly Detection
null
Journal Of Artificial Intelligence Research, Volume 46, pages 235-262, 2013
10.1613/jair.3623
null
cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Anomaly detection is being regarded as an unsupervised learning task as anomalies stem from adversarial or unlikely events with unknown distributions. However, the predictive performance of purely unsupervised anomaly detection often fails to match the required detection rates in many tasks and there exists a need for labeled data to guide the model generation. Our first contribution shows that classical semi-supervised approaches, originating from a supervised classifier, are inappropriate and hardly detect new and unknown anomalies. We argue that semi-supervised anomaly detection needs to ground on the unsupervised learning paradigm and devise a novel algorithm that meets this requirement. Although being intrinsically non-convex, we further show that the optimization problem has a convex equivalent under relatively mild assumptions. Additionally, we propose an active learning strategy to automatically filter candidates for labeling. In an empirical study on network intrusion detection data, we observe that the proposed learning methodology requires much less labeled data than the state-of-the-art, while achieving higher detection accuracies.
[ { "created": "Thu, 23 Jan 2014 02:46:53 GMT", "version": "v1" } ]
2014-01-27
[ [ "Goernitz", "Nico", "" ], [ "Kloft", "Marius Micha", "" ], [ "Rieck", "Konrad", "" ], [ "Brefeld", "Ulf", "" ] ]
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1401.6427
Seyed Abolghasem Mirroshandel
Seyed Abolghasem Mirroshandel, Gholamreza Ghassem-Sani
Towards Unsupervised Learning of Temporal Relations between Events
null
Journal Of Artificial Intelligence Research, Volume 45, pages 125-163, 2012
10.1613/jair.3693
null
cs.LG cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Automatic extraction of temporal relations between event pairs is an important task for several natural language processing applications such as Question Answering, Information Extraction, and Summarization. Since most existing methods are supervised and require large corpora, which for many languages do not exist, we have concentrated our efforts to reduce the need for annotated data as much as possible. This paper presents two different algorithms towards this goal. The first algorithm is a weakly supervised machine learning approach for classification of temporal relations between events. In the first stage, the algorithm learns a general classifier from an annotated corpus. Then, inspired by the hypothesis of "one type of temporal relation per discourse, it extracts useful information from a cluster of topically related documents. We show that by combining the global information of such a cluster with local decisions of a general classifier, a bootstrapping cross-document classifier can be built to extract temporal relations between events. Our experiments show that without any additional annotated data, the accuracy of the proposed algorithm is higher than that of several previous successful systems. The second proposed method for temporal relation extraction is based on the expectation maximization (EM) algorithm. Within EM, we used different techniques such as a greedy best-first search and integer linear programming for temporal inconsistency removal. We think that the experimental results of our EM based algorithm, as a first step toward a fully unsupervised temporal relation extraction method, is encouraging.
[ { "created": "Thu, 23 Jan 2014 02:50:50 GMT", "version": "v1" } ]
2014-01-27
[ [ "Mirroshandel", "Seyed Abolghasem", "" ], [ "Ghassem-Sani", "Gholamreza", "" ] ]
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1401.6428
Thomas Voice
Thomas Voice, Maria Polukarov, Nicholas R. Jennings
Coalition Structure Generation over Graphs
arXiv admin note: text overlap with arXiv:1102.1747
Journal Of Artificial Intelligence Research, Volume 45, pages 165-196, 2012
10.1613/jair.3715
null
cs.DS cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We give the analysis of the computational complexity of coalition structure generation over graphs. Given an undirected graph G = (N,E) and a valuation function v : P(N) \to R over the subsets of nodes, the problem is to find a partition of N into connected subsets, that maximises the sum of the components values. This problem is generally NP-complete; in particular, it is hard for a defined class of valuation functions which are independent of disconnected members - that is, two nodes have no effect on each other's marginal contribution to their vertex separator. Nonetheless, for all such functions we provide bounds on the complexity of coalition structure generation over general and minor-free graphs. Our proof is constructive and yields algorithms for solving corresponding instances of the problem. Furthermore, we derive linear time bounds for graphs of bounded treewidth. However, as we show, the problem remains NP-complete for planar graphs, and hence, for any K_k minor free graphs where k \geq 5. Moreover, a 3-SAT problem with m clauses can be represented by a coalition structure generation problem over a planar graph with O(m^2) nodes. Importantly, our hardness result holds for a particular subclass of valuation functions, termed edge sum, where the value of each subset of nodes is simply determined by the sum of given weights of the edges in the induced subgraph.
[ { "created": "Thu, 23 Jan 2014 16:45:24 GMT", "version": "v1" } ]
2014-01-27
[ [ "Voice", "Thomas", "" ], [ "Polukarov", "Maria", "" ], [ "Jennings", "Nicholas R.", "" ] ]
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1401.6432
Nir Elkayam
Nir Elkayam and Meir Feder
A Universal Decoder Relative to a Given Family of Metrics
Accepted to ISIT 2014
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Consider the following framework of universal decoding suggested in [MerhavUniversal]. Given a family of decoding metrics and random coding distribution (prior), a single, universal, decoder is optimal if for any possible channel the average error probability when using this decoder is better than the error probability attained by the best decoder in the family up to a subexponential multiplicative factor. We describe a general universal decoder in this framework. The penalty for using this universal decoder is computed. The universal metric is constructed as follows. For each metric, a canonical metric is defined and conditions for the given prior to be normal are given. A sub-exponential set of canonical metrics of normal prior can be merged to a single universal optimal metric. We provide an example where this decoder is optimal while the decoder of [MerhavUniversal] is not.
[ { "created": "Fri, 24 Jan 2014 19:35:55 GMT", "version": "v1" }, { "created": "Sun, 9 Feb 2014 19:53:50 GMT", "version": "v2" }, { "created": "Sun, 27 Apr 2014 18:11:15 GMT", "version": "v3" } ]
2014-04-29
[ [ "Elkayam", "Nir", "" ], [ "Feder", "Meir", "" ] ]
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1401.6437
Elsayed Ahmed
Elsayed Ahmed, and Ahmed M. Eltawil
On Phase Noise Suppression in Full-Duplex Systems
Published in IEEE transactions on wireless communications on October-2014. Please refer to the IEEE version for the most updated document
null
10.1109/TWC.2014.2365536
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Oscillator phase noise has been shown to be one of the main performance limiting factors in full-duplex systems. In this paper, we consider the problem of self-interference cancellation with phase noise suppression in full-duplex systems. The feasibility of performing phase noise suppression in full-duplex systems in terms of both complexity and achieved gain is analytically and experimentally investigated. First, the effect of phase noise on full-duplex systems and the possibility of performing phase noise suppression are studied. Two different phase noise suppression techniques with a detailed complexity analysis are then proposed. For each suppression technique, both free-running and phase locked loop based oscillators are considered. Due to the fact that full-duplex system performance highly depends on hardware impairments, experimental analysis is essential for reliable results. In this paper, the performance of the proposed techniques is experimentally investigated in a typical indoor environment. The experimental results are shown to confirm the results obtained from numerical simulations on two different experimental research platforms. At the end, the tradeoff between the required complexity and the gain achieved using phase noise suppression is discussed.
[ { "created": "Fri, 24 Jan 2014 19:52:27 GMT", "version": "v1" }, { "created": "Tue, 28 Oct 2014 17:54:47 GMT", "version": "v2" }, { "created": "Thu, 6 Nov 2014 18:57:26 GMT", "version": "v3" } ]
2014-11-07
[ [ "Ahmed", "Elsayed", "" ], [ "Eltawil", "Ahmed M.", "" ] ]
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1401.6444
William Glisson
Karl-Johan Karlsson, William Bradley Glisson
Android Anti-forensics: Modifying CyanogenMod
Karlsson, K.-J. and W.B. Glisson, Android Anti-forensics: Modifying CyanogenMod in Hawaii International Conference on System Sciences (HICSS-47). 2014, IEEE Computer Society Press: Hawaii
null
10.1109/HICSS.2014.593
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Mobile devices implementing Android operating systems inherently create opportunities to present environments that are conducive to anti-forensic activities. Previous mobile forensics research focused on applications and data hiding anti-forensics solutions. In this work, a set of modifications were developed and implemented on a CyanogenMod community distribution of the Android operating system. The execution of these solutions successfully prevented data extractions, blocked the installation of forensic tools, created extraction delays and presented false data to industry accepted forensic analysis tools without impacting normal use of the device. The research contribution is an initial empirical analysis of the viability of operating system modifications in an anti-forensics context along with providing the foundation for future research.
[ { "created": "Fri, 24 Jan 2014 20:23:05 GMT", "version": "v1" } ]
2016-11-17
[ [ "Karlsson", "Karl-Johan", "" ], [ "Glisson", "William Bradley", "" ] ]
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1401.6449
Viet Chi Tran
St\'ephan Cl\'emen\c{c}on, Hector De Arazoza (MATCOM), Fabrice Rossi, Viet Chi Tran
A statistical network analysis of the HIV/AIDS epidemics in Cuba
null
null
null
null
stat.AP cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Cuban contact-tracing detection system set up in 1986 allowed the reconstruction and analysis of the sexual network underlying the epidemic (5,389 vertices and 4,073 edges, giant component of 2,386 nodes and 3,168 edges), shedding light onto the spread of HIV and the role of contact-tracing. Clustering based on modularity optimization provides a better visualization and understanding of the network, in combination with the study of covariates. The graph has a globally low but heterogeneous density, with clusters of high intraconnectivity but low interconnectivity. Though descriptive, our results pave the way for incorporating structure when studying stochastic SIR epidemics spreading on social networks.
[ { "created": "Fri, 24 Jan 2014 20:41:20 GMT", "version": "v1" }, { "created": "Mon, 17 Mar 2014 18:34:07 GMT", "version": "v2" }, { "created": "Thu, 21 May 2015 09:34:01 GMT", "version": "v3" }, { "created": "Fri, 22 May 2015 08:26:56 GMT", "version": "v4" } ]
2015-05-25
[ [ "Clémençon", "Stéphan", "", "MATCOM" ], [ "De Arazoza", "Hector", "", "MATCOM" ], [ "Rossi", "Fabrice", "" ], [ "Tran", "Viet Chi", "" ] ]
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1401.6454
Valerio Biancalana
Valerio Biancalana, Yordanka Dancheva, Leonardo Stiaccini
A fast pneumatic sample-shuttle with attenuated shocks
3 pages and 3 figures; 2 additional pages (2 figures) as a supplemental material
null
10.1063/1.4868092
null
physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe a home-built pneumatic shuttle suitable for the fast displacement of samples in the vicinity of a highly sensitive atomic magnetometer. The samples are magnetized at 1 T using a Halbach assembly of magnets. The device enables the remote detection of free induction decay in ultra-low-field and zero-field NMR experiments, in relaxometric measurements and in other applications involving the displacement of magnetized samples within time intervals as short as a few tens of milliseconds. Other possible applications of fast sample shuttling exist in radiological studies, where samples have to be irradiated and then analyzed in a 'cold' environment.
[ { "created": "Fri, 24 Jan 2014 14:05:56 GMT", "version": "v1" } ]
2016-01-27
[ [ "Biancalana", "Valerio", "" ], [ "Dancheva", "Yordanka", "" ], [ "Stiaccini", "Leonardo", "" ] ]
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1401.6455
Lingjie Duan
Lingjie Duan, Takeshi Kubo, Kohei Sugiyama, Jianwei Huang, Teruyuki Hasegawa, and Jean Walrand
Motivating Smartphone Collaboration in Data Acquisition and Distributed Computing
This paper will appear at IEEE Transactions on Mobil Computing
null
10.1109/TMC.2014.2307327
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper analyzes and compares different incentive mechanisms for a master to motivate the collaboration of smartphone users on both data acquisition and distributed computing applications. To collect massive sensitive data from users, we propose a reward-based collaboration mechanism, where the master announces a total reward to be shared among collaborators, and the collaboration is successful if there are enough users wanting to collaborate. We show that if the master knows the users' collaboration costs, then he can choose to involve only users with the lowest costs. However, without knowing users' private information, then he needs to offer a larger total reward to attract enough collaborators. Users will benefit from knowing their costs before the data acquisition. Perhaps surprisingly, the master may benefit as the variance of users' cost distribution increases. To utilize smartphones' computation resources to solve complex computing problems, we study how the master can design an optimal contract by specifying different task-reward combinations for different user types. Under complete information, we show that the master involves a user type as long as the master's preference characteristic outweighs that type's unit cost. All collaborators achieve a zero payoff in this case. If the master does not know users' private cost information, however, he will conservatively target at a smaller group of users with small costs, and has to give most benefits to the collaborators.
[ { "created": "Sun, 26 Jan 2014 09:04:15 GMT", "version": "v1" } ]
2016-11-17
[ [ "Duan", "Lingjie", "" ], [ "Kubo", "Takeshi", "" ], [ "Sugiyama", "Kohei", "" ], [ "Huang", "Jianwei", "" ], [ "Hasegawa", "Teruyuki", "" ], [ "Walrand", "Jean", "" ] ]
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1401.6468
Andrew Baggaley
D.H. Wacks, A.W. Baggaley, C.F.Barenghi
Coherent laminar and turbulent motion of toroidal vortex bundles
22 pages, 12 figures
null
10.1063/1.4864659
null
physics.flu-dyn cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Motivated by experiments performed in superfluid helium, we study numerically the motion of toroidal bundles of vortex filaments in an inviscid fluid. We find that the evolution of these large-scale vortex structures involves the generalised leapfrogging of the constituent vortex rings. Despite three dimensional perturbations in the form of Kelvin waves and vortex reconnections, toroidal vortex bundles retain their coherence over a relatively large distance (compared to their size), in agreement with experimental observations.
[ { "created": "Fri, 24 Jan 2014 22:10:08 GMT", "version": "v1" } ]
2015-06-18
[ [ "Wacks", "D. H.", "" ], [ "Baggaley", "A. W.", "" ], [ "Barenghi", "C. F.", "" ] ]
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1401.6476
Dilip Bethanabhotla
Dilip Bethanabhotla, Giuseppe Caire, Michael J. Neely
Adaptive Video Streaming in MU-MIMO Networks
submitted to IEEE Intl. Symposium on Information Theory 2014
null
null
null
cs.IT cs.MM cs.NI math.IT math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider extensions and improvements on our previous work on dynamic adaptive video streaming in a multi-cell multiuser ``small cell'' wireless network. Previously, we treated the case of single-antenna base stations and, starting from a network utility maximization (NUM) formulation, we devised a ``push'' scheduling policy, where users place requests to sequential video chunks to possibly different base stations with adaptive video quality, and base stations schedule their downlink transmissions in order to stabilize their transmission queues. In this paper we consider a ``pull'' strategy, where every user maintains a request queue, such that users keep track of the video chunks that are effectively delivered. The pull scheme allows to download the chunks in the playback order without skipping or missing them. In addition, motivated by the recent/forthcoming progress in small cell networks (e.g., in wave-2 of the recent IEEE 802.11ac standard), we extend our dynamic streaming approach to the case of base stations capable of multiuser MIMO downlink, i.e., serving multiple users on the same time-frequency slot by spatial multiplexing. By exploiting the ``channel hardening'' effect of high dimensional MIMO channels, we devise a low complexity user selection scheme to solve the underlying max-weighted rate scheduling, which can be easily implemented and runs independently at each base station. Through simulations, we show MIMO gains in terms of video streaming QoE metrics like the pre-buffering and re-buffering times.
[ { "created": "Sat, 25 Jan 2014 00:04:36 GMT", "version": "v1" } ]
2014-01-28
[ [ "Bethanabhotla", "Dilip", "" ], [ "Caire", "Giuseppe", "" ], [ "Neely", "Michael J.", "" ] ]
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1401.6481
Robin Thomas
Neil Robertson, Daniel P. Sanders, Paul Seymour and Robin Thomas
Reducibility in the Four-Color Theorem
8 pages, 2 ancillary files. These files were originally posted on an anonymous ftp server and later (after the server's shutdown) were relocated to the last author's website
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math.CO cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In [J. Combin. Theory Ser. B 70 (1997), 2-44] we gave a simplified proof of the Four-Color Theorem. The proof is computer-assisted in the sense that for two lemmas in the article we did not give proofs, and instead asserted that we have verified those statements using a computer. Here we give additional details for one of those lemmas, and we include the original computer programs and data as "ancillary files" accompanying this submission.
[ { "created": "Sat, 25 Jan 2014 01:26:34 GMT", "version": "v1" } ]
2014-01-28
[ [ "Robertson", "Neil", "" ], [ "Sanders", "Daniel P.", "" ], [ "Seymour", "Paul", "" ], [ "Thomas", "Robin", "" ] ]
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1401.6482
Aria Ghasemian Sahebi
Aria G. Sahebi and S. Sandeep Pradhan
Nested Polar Codes Achieve the Shannon Rate-Distortion Function and the Shannon Capacity
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is shown that nested polar codes achieve the Shannon rate-distortion function for arbitrary (binary or non-binary) discrete memoryless sources and the Shannon capacity of arbitrary discrete memoryless channels.
[ { "created": "Sat, 25 Jan 2014 01:26:53 GMT", "version": "v1" } ]
2014-01-28
[ [ "Sahebi", "Aria G.", "" ], [ "Pradhan", "S. Sandeep", "" ] ]
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1401.6483
Hu Qin
Zhixin Luo and Hu Qin and Wenbin Zhu and Andrew Lim
Branch-and-price-and-cut for the Split-collection Vehicle Routing Problem with Time Windows and Linear Weight-related Cost
22 pages
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper addresses a new vehicle routing problem that simultaneously involves time windows, split collection and linear weight-related cost, which is a generalization of the split delivery vehicle routing problem with time windows (SDVRPTW). This problem consists of determining least-cost vehicle routes to serve a set of customers while respecting the restrictions of vehicle capacity and time windows. The travel cost per unit distance is a linear function of the vehicle weight and the customer demand can be fulfilled by multiple vehicles. To solve this problem, we propose a exact branch-and-price-and-cut algorithm, where the pricing subproblem is a resource-constrained elementary least-cost path problem. We first prove that at least an optimal solution to the pricing subproblem is associated with an extreme collection pattern, and then design a tailored and novel label-setting algorithm to solve it. Computational results show that our proposed algorithm can handle both the SDVRPTW and our problem effectively.
[ { "created": "Sat, 25 Jan 2014 01:38:49 GMT", "version": "v1" } ]
2014-01-28
[ [ "Luo", "Zhixin", "" ], [ "Qin", "Hu", "" ], [ "Zhu", "Wenbin", "" ], [ "Lim", "Andrew", "" ] ]
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1401.6484
Kiran Sree Pokkuluri Prof
Pokkuluri Kiran Sree, Inampudi Ramesh Babu
Identification of Protein Coding Regions in Genomic DNA Using Unsupervised FMACA Based Pattern Classifier
arXiv admin note: text overlap with arXiv:1312.2642
IJCSNS International Journal of Computer Science and Network Security, VOL.8 No.1, January 2008,305-310
null
null
cs.CE cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Genes carry the instructions for making proteins that are found in a cell as a specific sequence of nucleotides that are found in DNA molecules. But, the regions of these genes that code for proteins may occupy only a small region of the sequence. Identifying the coding regions play a vital role in understanding these genes. In this paper we propose a unsupervised Fuzzy Multiple Attractor Cellular Automata (FMCA) based pattern classifier to identify the coding region of a DNA sequence. We propose a distinct K-Means algorithm for designing FMACA classifier which is simple, efficient and produces more accurate classifier than that has previously been obtained for a range of different sequence lengths. Experimental results confirm the scalability of the proposed Unsupervised FCA based classifier to handle large volume of datasets irrespective of the number of classes, tuples and attributes. Good classification accuracy has been established.
[ { "created": "Sat, 25 Jan 2014 01:48:14 GMT", "version": "v1" } ]
2014-01-28
[ [ "Sree", "Pokkuluri Kiran", "" ], [ "Babu", "Inampudi Ramesh", "" ] ]
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1401.6485
Robin Thomas
Neil Robertson, Daniel P. Sanders, Paul Seymour and Robin Thomas
Discharging cartwheels
22 pages, 9 ancillary files. These files were originally posted on an anonymous ftp server and later (after the server's shutdown) were relocated to the last author's website
null
null
null
math.CO cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In [J. Combin. Theory Ser. B 70 (1997), 2-44] we gave a simplified proof of the Four-Color Theorem. The proof is computer-assisted in the sense that for two lemmas in the article we did not give proofs, and instead asserted that we have verified those statements using a computer. Here we give additional details for one of those lemmas, and we include the original computer programs and data as "ancillary files" accompanying this submission.
[ { "created": "Sat, 25 Jan 2014 01:55:32 GMT", "version": "v1" } ]
2014-01-28
[ [ "Robertson", "Neil", "" ], [ "Sanders", "Daniel P.", "" ], [ "Seymour", "Paul", "" ], [ "Thomas", "Robin", "" ] ]
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1401.6488
Dusko Pavlovic
Dusko Pavlovic
Chasing diagrams in cryptography
17 pages, 4 figures; to appear in: 'Categories in Logic, Language and Physics. Festschrift on the occasion of Jim Lambek's 90th birthday', Claudia Casadio, Bob Coecke, Michael Moortgat, and Philip Scott (editors); this version: fixed typos found by kind readers
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cs.CR math.CT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cryptography is a theory of secret functions. Category theory is a general theory of functions. Cryptography has reached a stage where its structures often take several pages to define, and its formulas sometimes run from page to page. Category theory has some complicated definitions as well, but one of its specialties is taming the flood of structure. Cryptography seems to be in need of high level methods, whereas category theory always needs concrete applications. So why is there no categorical cryptography? One reason may be that the foundations of modern cryptography are built from probabilistic polynomial-time Turing machines, and category theory does not have a good handle on such things. On the other hand, such foundational problems might be the very reason why cryptographic constructions often resemble low level machine programming. I present some preliminary explorations towards categorical cryptography. It turns out that some of the main security concepts are easily characterized through the categorical technique of *diagram chasing*, which was first used Lambek's seminal `Lecture Notes on Rings and Modules'.
[ { "created": "Sat, 25 Jan 2014 02:21:38 GMT", "version": "v1" }, { "created": "Mon, 7 Nov 2016 23:01:50 GMT", "version": "v2" } ]
2016-11-09
[ [ "Pavlovic", "Dusko", "" ] ]
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1401.6495
Wei Jeng
Wei Jeng, Daqing He, Jiepu Jiang
User Participation in an Academic Social Networking Service: A Survey of Open Group Users on Mendeley
null
Journal of the Association for Information Science and Technology. 66(2015), 890-904
10.1002/asi.23225
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Although there are a number of social networking services that specifically target scholars, little has been published about the actual practices and the usage of these so-called academic social networking services (ASNSs). To fill this gap, we explore the populations of academics who engage in social activities using an ASNS; as an indicator of further engagement, we also determine their various motivations for joining a group in ASNSs. Using groups and their members in Mendeley as the platform for our case study, we obtained 146 participant responses from our online survey about users' common activities, usage habits, and motivations for joining groups. Our results show that 1) participants did not engage with social-based features as frequently and actively as they engaged with research-based features, and 2) users who joined more groups seemed to have a stronger motivation to increase their professional visibility and to contribute the research articles they had read to the group reading list. Our results generate interesting insights into Mendeley's user populations, their activities, and their motivations relative to the social features of Mendeley. We also argue that further design of ASNSs is needed to take greater account of disciplinary differences in scholarly communication and to establish incentive mechanisms for encouraging user participation.
[ { "created": "Sat, 25 Jan 2014 04:48:07 GMT", "version": "v1" }, { "created": "Tue, 4 Feb 2014 16:50:59 GMT", "version": "v2" }, { "created": "Tue, 9 Jun 2015 20:08:07 GMT", "version": "v3" } ]
2015-06-11
[ [ "Jeng", "Wei", "" ], [ "He", "Daqing", "" ], [ "Jiang", "Jiepu", "" ] ]
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1401.6496
Eitan Yaakobi
Arman Fazeli, Alexander Vardy, and Eitan Yaakobi
Generalized Sphere Packing Bound
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Kulkarni and Kiyavash recently introduced a new method to establish upper bounds on the size of deletion-correcting codes. This method is based upon tools from hypergraph theory. The deletion channel is represented by a hypergraph whose edges are the deletion balls (or spheres), so that a deletion-correcting code becomes a matching in this hypergraph. Consequently, a bound on the size of such a code can be obtained from bounds on the matching number of a hypergraph. Classical results in hypergraph theory are then invoked to compute an upper bound on the matching number as a solution to a linear-programming problem. The method by Kulkarni and Kiyavash can be applied not only for the deletion channel but also for other error channels. This paper studies this method in its most general setup. First, it is shown that if the error channel is regular and symmetric then this upper bound coincides with the sphere packing bound and thus is called the generalized sphere packing bound. Even though this bound is explicitly given by a linear programming problem, finding its exact value may still be a challenging task. In order to simplify the complexity of the problem, we present a technique based upon graph automorphisms that in many cases reduces the number of variables and constraints in the problem. We then apply this method on specific examples of error channels. We start with the $Z$ channel and show how to exactly find the generalized sphere packing bound for this setup. Next studied is the non-binary limited magnitude channel both for symmetric and asymmetric errors, where we focus on the single-error case. We follow up on the deletion and grain-error channels and show how to improve upon the existing upper bounds for single deletion/error. Finally, we apply this method for projective spaces and find its generalized sphere packing bound for the single-error case.
[ { "created": "Sat, 25 Jan 2014 04:57:43 GMT", "version": "v1" } ]
2014-01-28
[ [ "Fazeli", "Arman", "" ], [ "Vardy", "Alexander", "" ], [ "Yaakobi", "Eitan", "" ] ]
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1401.6497
Qibin Zhao Dr
Qibin Zhao, Liqing Zhang, and Andrzej Cichocki
Bayesian CP Factorization of Incomplete Tensors with Automatic Rank Determination
null
null
10.1109/TPAMI.2015.2392756
null
cs.LG cs.CV stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
CANDECOMP/PARAFAC (CP) tensor factorization of incomplete data is a powerful technique for tensor completion through explicitly capturing the multilinear latent factors. The existing CP algorithms require the tensor rank to be manually specified, however, the determination of tensor rank remains a challenging problem especially for CP rank. In addition, existing approaches do not take into account uncertainty information of latent factors, as well as missing entries. To address these issues, we formulate CP factorization using a hierarchical probabilistic model and employ a fully Bayesian treatment by incorporating a sparsity-inducing prior over multiple latent factors and the appropriate hyperpriors over all hyperparameters, resulting in automatic rank determination. To learn the model, we develop an efficient deterministic Bayesian inference algorithm, which scales linearly with data size. Our method is characterized as a tuning parameter-free approach, which can effectively infer underlying multilinear factors with a low-rank constraint, while also providing predictive distributions over missing entries. Extensive simulations on synthetic data illustrate the intrinsic capability of our method to recover the ground-truth of CP rank and prevent the overfitting problem, even when a large amount of entries are missing. Moreover, the results from real-world applications, including image inpainting and facial image synthesis, demonstrate that our method outperforms state-of-the-art approaches for both tensor factorization and tensor completion in terms of predictive performance.
[ { "created": "Sat, 25 Jan 2014 05:08:33 GMT", "version": "v1" }, { "created": "Thu, 9 Oct 2014 09:48:37 GMT", "version": "v2" } ]
2015-01-22
[ [ "Zhao", "Qibin", "" ], [ "Zhang", "Liqing", "" ], [ "Cichocki", "Andrzej", "" ] ]
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Bayesian CP Factorization of Incomplete Tensors with Automatic Rank Determination
http://arxiv.org/abs/1401.6497v2
http://arxiv.org/pdf/1401.6497v2.pdf
https://github.com/zhaoxile/reproducible-tensor-completion-state-of-the-art
false
false
https://paperswithcode.com/paper/bayesian-cp-factorization-of-incomplete
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1401.6498
Parham Noorzad
Parham Noorzad, Michelle Effros, Michael Langberg, Tracey Ho
On the Power of Cooperation: Can a Little Help a Lot? (Extended Version)
Extended version of a paper submitted to ISIT 2014 (10 pages, 3 figures)
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we propose a new cooperation model for discrete memoryless multiple access channels. Unlike in prior cooperation models (e.g., conferencing encoders), where the transmitters cooperate directly, in this model the transmitters cooperate through a larger network. We show that under this indirect cooperation model, there exist channels for which the increase in sum-capacity resulting from cooperation is significantly larger than the rate shared by the transmitters to establish the cooperation. This result contrasts both with results on the benefit of cooperation under prior models and results in the network coding literature, where attempts to find examples in which similar small network modifications yield large capacity benefits have to date been unsuccessful.
[ { "created": "Sat, 25 Jan 2014 05:20:03 GMT", "version": "v1" }, { "created": "Sun, 27 Apr 2014 19:49:48 GMT", "version": "v2" } ]
2014-04-29
[ [ "Noorzad", "Parham", "" ], [ "Effros", "Michelle", "" ], [ "Langberg", "Michael", "" ], [ "Ho", "Tracey", "" ] ]
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1401.6499
Sanjay Vishwakarma
Sanjay Vishwakarma and A. Chockalingam
Transmitter Optimization in MISO Broadcast Channel with Common and Secret Messages
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null
null
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we consider transmitter optimization in multiple-input single-output (MISO) broadcast channel with common and secret messages. The secret message is intended for $K$ users and it is transmitted with perfect secrecy with respect to $J$ eavesdroppers which are also assumed to be legitimate users in the network. The common message is transmitted at a fixed rate $R_{0}$ and it is intended for all $K$ users and $J$ eavesdroppers. The source operates under a total power constraint. It also injects artificial noise to improve the secrecy rate. We obtain the optimum covariance matrices associated with the common message, secret message, and artificial noise, which maximize the achievable secrecy rate and simultaneously meet the fixed rate $R_{0}$ for the common message.
[ { "created": "Sat, 25 Jan 2014 05:24:12 GMT", "version": "v1" } ]
2014-01-28
[ [ "Vishwakarma", "Sanjay", "" ], [ "Chockalingam", "A.", "" ] ]
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1401.6500
Ryuhei Mori
Ryuhei Mori
Holographic Transformation for Quantum Factor Graphs
3 pages, revised
null
null
null
cs.IT cond-mat.stat-mech math.IT quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recently, a general tool called a holographic transformation, which transforms an expression of the partition function to another form, has been used for polynomial-time algorithms and for improvement and understanding of the belief propagation. In this work, the holographic transformation is generalized to quantum factor graphs.
[ { "created": "Sat, 25 Jan 2014 05:56:43 GMT", "version": "v1" }, { "created": "Thu, 6 Feb 2014 16:17:29 GMT", "version": "v2" } ]
2014-02-07
[ [ "Mori", "Ryuhei", "" ] ]
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1401.6508
Yehia El-khatib PhD
Yehia Elkhatib and Gareth Tyson and Michael Welzl
The Effect of Network and Infrastructural Variables on SPDY's Performance
null
null
null
SCC-2013-01
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
HTTP is a successful Internet technology on top of which a lot of the web resides. However, limitations with its current specification, i.e. HTTP/1.1, have encouraged some to look for the next generation of HTTP. In SPDY, Google has come up with such a proposal that has growing community acceptance, especially after being adopted by the IETF HTTPbis-WG as the basis for HTTP/2.0. SPDY has the potential to greatly improve web experience with little deployment overhead. However, we still lack an understanding of its true potential in different environments. This paper seeks to resolve these issues, offering a comprehensive evaluation of SPDY's performance using extensive experiments. We identify the impact of network characteristics and website infrastructure on SPDY's potential page loading benefits, finding that these factors are decisive for SPDY and its optimal deployment strategy. Through this, we feed into the wider debate regarding HTTP/2.0, exploring the key aspects that impact the performance of this future protocol.
[ { "created": "Sat, 25 Jan 2014 08:58:00 GMT", "version": "v1" } ]
2014-01-28
[ [ "Elkhatib", "Yehia", "" ], [ "Tyson", "Gareth", "" ], [ "Welzl", "Michael", "" ] ]
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1401.6512
Mina Karzand
Mina Karzand and Lizhong Zheng
Achievable Degrees of Freedom in MIMO Correlatively Changing Fading Channels
submitted for ISIT 2014. arXiv admin note: substantial text overlap with arXiv:1401.2169
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null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The relationship between the transmitted signal and the noiseless received signals in correlatively changing fading channels is modeled as a nonlinear mapping over manifolds of different dimensions. Dimension counting argument claims that the dimensionality of the neighborhood in which this mapping is bijective with probability one is achievable as the degrees of freedom of the system.We call the degrees of freedom achieved by the nonlinear decoding methods the nonlinear degrees of freedom.
[ { "created": "Sat, 25 Jan 2014 09:31:09 GMT", "version": "v1" } ]
2014-01-28
[ [ "Karzand", "Mina", "" ], [ "Zheng", "Lizhong", "" ] ]
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1401.6517
Jiangcheng Chen
Jiangcheng Chen, Xiaodong Zhang, Lei Zhu
Kinematics analysis and three-dimensional simulation of the rehabilitation lower extremity exoskeleton robot
The international conference on Soft Computing and Software Engineering
null
null
null
cs.RO
http://creativecommons.org/licenses/by/3.0/
The kinematics recursive equation was built by using the modified D-H method after the structure of rehabilitation lower extremity exoskeleton was analyzed. The numerical algorithm of inverse kinematics was given too. Then the three-dimensional simulation model of the exoskeleton robot was built using MATLAB software, based on the model, 3D reappearance of a complete gait was achieved. Finally, the reliability of numerical algorithm of inverse kinematics was verified by the simulation result. All jobs above lay a foundation for developing a three-dimensional simulation platform of exoskeleton robot.
[ { "created": "Sat, 25 Jan 2014 10:37:55 GMT", "version": "v1" } ]
2014-01-28
[ [ "Chen", "Jiangcheng", "" ], [ "Zhang", "Xiaodong", "" ], [ "Zhu", "Lei", "" ] ]
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1401.6520
Peng Cui
Peng Cui
Approximation Resistance by Disguising Biased Distributions
6 pages, short note
null
null
null
cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this short note, the author shows that the gap problem of some 3-XOR is NP-hard and can be solved by running Charikar\&Wirth's SDP algorithm for two rounds. To conclude, the author proves that $P=NP$.
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2015-11-10
[ [ "Cui", "Peng", "" ] ]
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1401.6523
Haris Aziz
Haris Aziz and Serge Gaspers and Nick Mattei and Nina Narodytska and Toby Walsh
Strategic aspects of the probabilistic serial rule for the allocation of goods
28 pages
null
null
null
cs.GT cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The probabilistic serial (PS) rule is one of the most prominent randomized rules for the assignment problem. It is well-known for its superior fairness and welfare properties. However, PS is not immune to manipulative behaviour by the agents. We examine computational and non-computational aspects of strategising under the PS rule. Firstly, we study the computational complexity of an agent manipulating the PS rule. We present polynomial-time algorithms for optimal manipulation. Secondly, we show that expected utility best responses can cycle. Thirdly, we examine the existence and computation of Nash equilibrium profiles under the PS rule. We show that a pure Nash equilibrium is guaranteed to exist under the PS rule. For two agents, we identify two different types of preference profiles that are not only in Nash equilibrium but can also be computed in linear time. Finally, we conduct experiments to check the frequency of manipulability of the PS rule under different combinations of the number of agents, objects, and utility functions.
[ { "created": "Sat, 25 Jan 2014 12:11:09 GMT", "version": "v1" } ]
2014-01-28
[ [ "Aziz", "Haris", "" ], [ "Gaspers", "Serge", "" ], [ "Mattei", "Nick", "" ], [ "Narodytska", "Nina", "" ], [ "Walsh", "Toby", "" ] ]
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1401.6528
Afonso S. Bandeira
Emmanuel Abbe, Noga Alon, Afonso S. Bandeira, Colin Sandon
Linear Boolean classification, coding and "the critical problem"
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The problem of constructing a minimal rank matrix over GF(2) whose kernel does not intersect a given set S is considered. In the case where S is a Hamming ball centered at 0, this is equivalent to finding linear codes of largest dimension. For a general set, this is an instance of "the critical problem" posed by Crapo and Rota in 1970. This work focuses on the case where S is an annulus. As opposed to balls, it is shown that an optimal kernel is composed not only of dense but also of sparse vectors, and the optimal mixture is identified in various cases. These findings corroborate a proposed conjecture that for annulus of inner and outer radius nq and np respectively, the optimal relative rank is given by (1-q)H(p/(1-q)), an extension of the Gilbert-Varshamov bound H(p) conjectured for Hamming balls of radius np.
[ { "created": "Sat, 25 Jan 2014 13:07:02 GMT", "version": "v1" }, { "created": "Sun, 18 May 2014 04:42:46 GMT", "version": "v2" }, { "created": "Sat, 27 Jun 2015 16:59:13 GMT", "version": "v3" } ]
2015-06-30
[ [ "Abbe", "Emmanuel", "" ], [ "Alon", "Noga", "" ], [ "Bandeira", "Afonso S.", "" ], [ "Sandon", "Colin", "" ] ]
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1401.6533
Kezhi Li
Kezhi Li and Shuang Cong
A Robust Compressive Quantum State Tomography Algorithm Using ADMM
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The possible state space dimension increases exponentially with respect to the number of qubits. This feature makes the quantum state tomography expensive and impractical for identifying the state of merely several qubits. The recent developed approach, compressed sensing, gives us an alternative to estimate the quantum state with fewer measurements. It is proved that the estimation then can be converted to a convex optimization problem with quantum mechanics constraints. In this paper we present an alternating augmented Lagrangian method for quantum convex optimization problem aiming for recovering pure or near pure quantum states corrupted by sparse noise given observables and the expectation values of the measurements. The proposed algorithm is much faster, robust to outlier noises (even very large for some entries) and can solve the reconstruction problem distributively. The simulations verify the superiority of the proposed algorithm and compare it to the conventional least square and compressive quantum tomography using Dantzig method.
[ { "created": "Sat, 25 Jan 2014 14:03:30 GMT", "version": "v1" } ]
2014-01-28
[ [ "Li", "Kezhi", "" ], [ "Cong", "Shuang", "" ] ]
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1401.6534
Amir Aghamohammadi
Mohammad Khorrami, Amir Aghamohammadi
A suspended rope wrapped around a cylinder
11 pages, 4 figures
Eur. J. Phys. 35 (2014) 025008
10.1088/0143-0807/35/2/025008
null
physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The problem of a suspended rope wrapped around a fixed cylinder is studied. If the suspension force is larger than a certain threshold (which is larger than the weight of the rope), the rope would remain tightly wrapped around the cylinder. For suspension forces smaller than that threshold but larger than another threshold, the rope becomes loose (loses contact with the cylinder) at some points, but still remains at rest. Theses thresholds are obtained when there is no friction. The system is then analyzed also with friction, and the threshold of tight-wrapping is obtained for that case as well.
[ { "created": "Sat, 25 Jan 2014 14:05:11 GMT", "version": "v1" } ]
2014-01-28
[ [ "Khorrami", "Mohammad", "" ], [ "Aghamohammadi", "Amir", "" ] ]
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1401.6536
Mike M\"uller
Mike M\"uller and Svetlana Puzynina and Micha\"el Rao
Infinite square-free self-shuffling words
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null
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cs.DM cs.FL math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we answer two recent questions from Charlier et al. and Harju about self-shuffling words. An infinite word $w$ is called self-shuffling, if $w=\prod_{i=0}^\infty U_iV_i=\prod_{i=0}^\infty U_i=\prod_{i=0}^\infty V_i$ for some finite words $U_i$, $V_i$. Harju recently asked whether square-free self-shuffling words exist. We answer this question affirmatively. Besides that, we build an infinite word such that no word in its shift orbit closure is self-shuffling, answering positively a question from Charlier et al.
[ { "created": "Sat, 25 Jan 2014 14:08:39 GMT", "version": "v1" }, { "created": "Sat, 8 Nov 2014 15:08:37 GMT", "version": "v2" } ]
2014-11-11
[ [ "Müller", "Mike", "" ], [ "Puzynina", "Svetlana", "" ], [ "Rao", "Michaël", "" ] ]
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1401.6541
Tao Yang
Tao Yang, Ziyang Meng, Guodong Shi, Yiguang Hong, Karl Henrik Johansson
Network Synchronization with Nonlinear Dynamics and Switching Interactions
27 pages, 0 figures
null
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper considers the synchronization problem for networks of coupled nonlinear dynamical systems under switching communication topologies. Two types of nonlinear agent dynamics are considered. The first one is non-expansive dynamics (stable dynamics with a convex Lyapunov function $\varphi(\cdot)$) and the second one is dynamics that satisfies a global Lipschitz condition. For the non-expansive case, we show that various forms of joint connectivity for communication graphs are sufficient for networks to achieve global asymptotic $\varphi$-synchronization. We also show that $\varphi$-synchronization leads to state synchronization provided that certain additional conditions are satisfied. For the globally Lipschitz case, unlike the non-expansive case, joint connectivity alone is not sufficient for achieving synchronization. A sufficient condition for reaching global exponential synchronization is established in terms of the relationship between the global Lipschitz constant and the network parameters. We also extend the results to leader-follower networks.
[ { "created": "Sat, 25 Jan 2014 14:41:21 GMT", "version": "v1" }, { "created": "Mon, 29 Dec 2014 07:01:30 GMT", "version": "v2" }, { "created": "Mon, 24 Aug 2015 03:40:44 GMT", "version": "v3" } ]
2015-08-25
[ [ "Yang", "Tao", "" ], [ "Meng", "Ziyang", "" ], [ "Shi", "Guodong", "" ], [ "Hong", "Yiguang", "" ], [ "Johansson", "Karl Henrik", "" ] ]
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1401.6543
Ananthanarayanan Chockalingam
T. Lakshmi Narasimhan, Yalagala Naresh, Tanumay Datta, and A. Chockalingam
Pseudo-random Phase Precoded Spatial Modulation
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Spatial modulation (SM) is a transmission scheme that uses multiple transmit antennas but only one transmit RF chain. At each time instant, only one among the transmit antennas will be active and the others remain silent. The index of the active transmit antenna will also convey information bits in addition to the information bits conveyed through modulation symbols (e.g.,QAM). Pseudo-random phase precoding (PRPP) is a technique that can achieve high diversity orders even in single antenna systems without the need for channel state information at the transmitter (CSIT) and transmit power control (TPC). In this paper, we exploit the advantages of both SM and PRPP simultaneously. We propose a pseudo-random phase precoded SM (PRPP-SM) scheme, where both the modulation bits and the antenna index bits are precoded by pseudo-random phases. The proposed PRPP-SM system gives significant performance gains over SM system without PRPP and PRPP system without SM. Since maximum likelihood (ML) detection becomes exponentially complex in large dimensions, we propose low complexity local search based detection (LSD) algorithm suited for PRPP-SM systems with large precoder sizes. Our simulation results show that with 4 transmit antennas, 1 receive antenna, $5\times 20$ pseudo-random phase precoder matrix and BPSK modulation, the performance of PRPP-SM using ML detection is better than SM without PRPP with ML detection by about 9 dB at $10^{-2}$ BER. This performance advantage gets even better for large precoding sizes.
[ { "created": "Sat, 25 Jan 2014 15:03:27 GMT", "version": "v1" } ]
2014-01-28
[ [ "Narasimhan", "T. Lakshmi", "" ], [ "Naresh", "Yalagala", "" ], [ "Datta", "Tanumay", "" ], [ "Chockalingam", "A.", "" ] ]
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1401.6546
Iver Brevik
Iver Brevik
Explanation for the Transverse Radiation Force Observed on a Vertically Hanging Fiber
9 pages latex, no figures. To appear in Phys. Rev. A
Physical Review A, vol 89, paper 025802 (2014)
10.1103/PhysRevA.89.025802
null
physics.optics quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
As shown in the experiment of She {\it et al.} [Phys. Rev. Lett. {\bf 101}, 243601 (2008)], a weak laser beam sent through a vertically hanging fiber exerts a transverse force and produces a lateral displacement of the fiber's lower end. The experiment is of obvious theoretical interest in connection with the electromagnetic theory of media. Suggested explanations given for this effect in the past include the famous Abraham-Minkowski issue concerning the "correct" photon momentum in matter. In our opinion such an explanation can hardly be right. Instead, we propose instead a very simple description of the effect implying that the sideways deflection is caused by the radiation force on the {\it obliquely cut} lower end face of the fiber. From a calculation based upon geometrical optics, we find quite good agreement with the observations. We present also, as an alternative approach, a calculation involving wave optics instead of geometrical optics, and find comparable results.
[ { "created": "Sat, 25 Jan 2014 15:35:08 GMT", "version": "v1" } ]
2015-06-18
[ [ "Brevik", "Iver", "" ] ]
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1401.6548
Stefan Hickel PhD
S Hickel, M. Mihatsch, S.J. Schmidt
Implicit Large Eddy Simulation of Cavitation in Micro Channel Flows
Proceedings of WIMRC 3rd International Cavitation Forum 2011 (ISBN 978-0-9570404-1-0)
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null
null
physics.flu-dyn physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a numerical method for Large Eddy Simulations (LES) of compressible two-phase flows. The method is validated for the flow in a micro channel with a step-like restriction. This setup is representative for typical cavitating multi-phase flows in fuel injectors and follows an experimental study of Iben et al., 2010. While a diesel-like test fuel was used in the experiment, we solve the compressible Navier-Stokes equations with a barotropic equation of state for water and vapor and a simple phase-change model based on equilibrium assumptions. Our LES resolve all wave dynamics in the compressible fluid and the turbulence production in shear layers.
[ { "created": "Sat, 25 Jan 2014 15:41:09 GMT", "version": "v1" } ]
2014-01-28
[ [ "Hickel", "S", "" ], [ "Mihatsch", "M.", "" ], [ "Schmidt", "S. J.", "" ] ]
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1401.6550
Jan Frederik Totz
Jan F. Totz, Harald Engel, Oliver Steinbock
Spatial Confinement Causes Lifetime Enhancement and Expansion of Vortex Rings with Positive Filament Tension
null
null
10.1088/1367-2630/17/9/093043
null
nlin.PS physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the impact of spatial confinement on the dynamics of three-dimensional excitation vortices with circular filaments. In a chemically active medium we observe a decreased contraction of such scroll rings and even expanding ones, despite of their positive filament tension. We propose a kinematical model which takes into account the interaction of the scroll ring with a confining Neumann boundary. The model reproduces all experimentally observed regimes of ring evolution, and correctly predicts the results obtained by numerical simulations of the underlying reaction-diffusion equations.
[ { "created": "Sat, 25 Jan 2014 15:46:22 GMT", "version": "v1" }, { "created": "Tue, 30 Jun 2015 09:22:51 GMT", "version": "v2" } ]
2015-10-28
[ [ "Totz", "Jan F.", "" ], [ "Engel", "Harald", "" ], [ "Steinbock", "Oliver", "" ] ]
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1401.6554
Xueqin Huang
Xueqin Huang, Meng Xiao, Zhao-Qing Zhang, and C. T. Chan
Deterministic formation of interface states in some two-dimensional photonic crystals with conical dispersions
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physics.optics cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
There is no assurance that interface states can be found at the boundary separating two materials. As a strong perturbation typically favors wave localization, it is natural to expect that an interface state should form more easily in the boundary that represents a strong perturbation. Here, we show on the contrary that in some two dimensional photonic crystals (PCs) with a square lattice possessing Dirac-like cone at k=0, a small perturbation guarantees the existence of interface states. More specifically, we find that single-mode localized states exist in a deterministic manner at an interface formed by two PCs each with system parameters slightly perturbed from the conical dispersion condition. The conical dispersion guarantees the existence of gaps in the projected band structure which allows interface states to form and the assured existence of interface states stems from the geometric phases of the bulk bands.
[ { "created": "Sat, 25 Jan 2014 16:16:49 GMT", "version": "v1" } ]
2014-01-28
[ [ "Huang", "Xueqin", "" ], [ "Xiao", "Meng", "" ], [ "Zhang", "Zhao-Qing", "" ], [ "Chan", "C. T.", "" ] ]
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1401.6561
Anna Viatkina
A. V. Viatkina, M. G. Kozlov
Sensitivity of Tunneling-Rotational Transitions in Ethylene Glycol to Variation of Electron-to-Proton Mass Ratio
revtex, 8p, 2fig, accepted to J.Mol.Spec; v.2: one more figure added and several new transitions included
null
10.1016/j.jms.2014.03.002
null
physics.atom-ph astro-ph.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Ethylene glycol in its ground conformation has tunneling transition with the frequency about 7 GHz. This leads to a rather complicated tunneling-rotational spectrum. Because tunneling and rotational energies have different dependence on the electron-to-proton mass ratio $\mu$, this spectrum is highly sensitive to the possible $\mu$ variation. We used simple 14 parameter effective Hamiltonian to calculate dimensionless sensitivity coefficients $Q_\mu$ of the tunneling-rotational transitions and found that they lie in the range from $-17$ to $+18$. Ethylene glycol has been detected in the interstellar medium. All this makes it one of the most sensitive probes of $\mu$ variation at the large space and time scales.
[ { "created": "Sat, 25 Jan 2014 18:04:13 GMT", "version": "v1" }, { "created": "Fri, 14 Mar 2014 17:24:34 GMT", "version": "v2" } ]
2015-06-18
[ [ "Viatkina", "A. V.", "" ], [ "Kozlov", "M. G.", "" ] ]
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