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1401.3497
Yuichiro Yano Mr
Yuichiro Yano, Wujie Gao, Shigeyoshi Goka and Masatoshi Kajita
Theoretical and experimental investigation of the light shift in Ramsey coherent population trapping
16 pages, 8 figures
Physical Review A 90, 013826 (2014)
10.1103/PhysRevA.90.013826
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The ac Stark shift (or light shift) of the 6$^{2}$S$_{1/2}$ (F $=$ 3 $\leftrightarrow $ 4) transition in $^{133}$Cs, as observed through coherent population trapping under pulsed excitation, is measured using a $^{133}$Cs gas cell and the $D_1$-line vertical-cavity surface-emitting laser. This light shift can be calculated using density-matrix analysis. We derive an expression for this shift as a function of light intensity, showing that it varies linearly with respect to light intensity only with intensities higher than 1.0~mW/cm$^2$. For pulsed excitation of high laser intensity, the variation in light shift is 20 times lower than that when using a continuous wave. The differences between the results of theory and experiment are discussed, taking into account the difference in conditions assumed; the results from theoretical analysis, taking the attenuation of the first-order sideband into account, approximately agree with the experimental results. The light shift is reduced by shortening the observation times.
[ { "created": "Wed, 15 Jan 2014 05:58:51 GMT", "version": "v1" }, { "created": "Tue, 10 Jun 2014 08:33:01 GMT", "version": "v2" }, { "created": "Wed, 6 Aug 2014 09:39:34 GMT", "version": "v3" } ]
2014-08-07
[ [ "Yano", "Yuichiro", "" ], [ "Gao", "Wujie", "" ], [ "Goka", "Shigeyoshi", "" ], [ "Kajita", "Masatoshi", "" ] ]
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1401.3502
Xiao Lu
Xiao Lu, Ping Wang, Niyato Dusit, Hossain Ekram
Dynamic Spectrum Access in Cognitive Radio Networks with RF Energy Harvesting
To appear in IEEE Wireless Communications
null
10.1109/MWC.2014.6845054
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Spectrum efficiency and energy efficiency are two critical issues in designing wireless networks. Through dynamic spectrum access, cognitive radios can improve the spectrum efficiency and capacity of wireless networks. On the other hand, radio frequency (RF) energy harvesting has emerged as a promising technique to supply energy to wireless networks and thereby increase their energy efficiency. Therefore, to achieve both spectrum and energy efficiencies, the secondary users in a cognitive radio network (CRN) can be equipped with the RF energy harvesting capability and such a network can be referred to as an RF-powered cognitive radio network. In this article, we provide an overview of the RF-powered CRNs and discuss the challenges that arise for dynamic spectrum access in these networks. Focusing on the tradeoff among spectrum sensing, data transmission, and RF energy harvesting, then we discuss the dynamic channel selection problem in a multi-channel RF-powered CRN. In the RF-powered CRN, a secondary user can adaptively select a channel to transmit data when the channel is not occupied by any primary user. Alternatively, the secondary user can harvest RF energy for data transmission if the channel is occupied. The optimal channel selection policy of the secondary user can be obtained by formulating a Markov decision process (MDP) problem. We present some numerical results obtained by solving this MDP problem.
[ { "created": "Wed, 15 Jan 2014 06:51:53 GMT", "version": "v1" }, { "created": "Fri, 18 Apr 2014 15:45:55 GMT", "version": "v2" } ]
2016-11-15
[ [ "Lu", "Xiao", "" ], [ "Wang", "Ping", "" ], [ "Dusit", "Niyato", "" ], [ "Ekram", "Hossain", "" ] ]
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1401.3506
Xiao Lu
Xiao Lu, Ping Wang, Dusit Niyato
A Layered Coalitional Game Framework of Wireless Relay Network
Accepted for publication in IEEE Transactions on Vehicular Technology
null
10.1109/TVT.2013.2274533
null
cs.NI cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A wireless relay network (WRN) has recently emerged as an effective way to increase communication capacity and extend a coverage area with a low cost. In the WRN, multiple service providers (SPs) can cooperate to share their resources (e.g., relay nodes and spectrum), to achieve higher utility in terms of revenue. Such cooperation can improve the capacity of the WRN, and thus throughput for terminal devices (TDs). However, this cooperation can be realized only if fair allocation of aggregated utility, which is the sum of the utility of all the cooperative SPs, can be achieved. In this paper, we investigate the WRN consisting of SPs at the upper layer and TDs at the lower layer and present a game theoretic framework to address the cooperation decision making problem in the WRN. Specifically, the cooperation of SPs is modeled as an overlapping coalition formation game, in which SPs should form a stable coalitional structure and obtain a fair share of the aggregated utility. We also study the problem of allocating aggregated utility based on the concept of Shapley value, which stabilizes the cooperation of SPs in the WRN. The cooperation of TDs is modeled as a network formation game, in which TDs establish links among each other to form a stable network structure. Numerical results demonstrate that the proposed distributed algorithm obtains the aggregated utility approximating the optimal solutions and achieves good convergence speed.
[ { "created": "Wed, 15 Jan 2014 07:11:54 GMT", "version": "v1" } ]
2016-11-15
[ [ "Lu", "Xiao", "" ], [ "Wang", "Ping", "" ], [ "Niyato", "Dusit", "" ] ]
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1401.3510
Saurabh Varshney Mr.
Saurabh Varshney and Jyoti Bajpai
Improving Performance Of English-Hindi Cross Language Information Retrieval Using Transliteration Of Query Terms
International Journal on Natural Language Computing (IJNLC) Vol. 2, No.6, December 2013 http://airccse.org/journal/ijnlc/index.html
null
10.5121/ijnlc.2013.2604
null
cs.IR cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The main issue in Cross Language Information Retrieval (CLIR) is the poor performance of retrieval in terms of average precision when compared to monolingual retrieval performance. The main reasons behind poor performance of CLIR are mismatching of query terms, lexical ambiguity and un-translated query terms. The existing problems of CLIR are needed to be addressed in order to increase the performance of the CLIR system. In this paper, we are putting our effort to solve the given problem by proposed an algorithm for improving the performance of English-Hindi CLIR system. We used all possible combination of Hindi translated query using transliteration of English query terms and choosing the best query among them for retrieval of documents. The experiment is performed on FIRE 2010 (Forum of Information Retrieval Evaluation) datasets. The experimental result show that the proposed approach gives better performance of English-Hindi CLIR system and also helps in overcoming existing problems and outperforms the existing English-Hindi CLIR system in terms of average precision.
[ { "created": "Wed, 15 Jan 2014 08:07:08 GMT", "version": "v1" } ]
2014-01-16
[ [ "Varshney", "Saurabh", "" ], [ "Bajpai", "Jyoti", "" ] ]
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1401.3511
Hongxing Li Dr.
Hongxing Li and Nitin Vaidya
Optimal CSMA-based Wireless Communication with Worst-case Delay and Non-uniform Sizes
null
null
null
null
cs.NI cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Carrier Sense Multiple Access (CSMA) protocols have been shown to reach the full capacity region for data communication in wireless networks, with polynomial complexity. However, current literature achieves the throughput optimality with an exponential delay scaling with the network size, even in a simplified scenario for transmission jobs with uniform sizes. Although CSMA protocols with order-optimal average delay have been proposed for specific topologies, no existing work can provide worst-case delay guarantee for each job in general network settings, not to mention the case when the jobs have non-uniform lengths while the throughput optimality is still targeted. In this paper, we tackle on this issue by proposing a two-timescale CSMA-based data communication protocol with dynamic decisions on rate control, link scheduling, job transmission and dropping in polynomial complexity. Through rigorous analysis, we demonstrate that the proposed protocol can achieve a throughput utility arbitrarily close to its offline optima for jobs with non-uniform sizes and worst-case delay guarantees, with a tradeoff of longer maximum allowable delay.
[ { "created": "Wed, 15 Jan 2014 08:08:17 GMT", "version": "v1" } ]
2014-01-16
[ [ "Li", "Hongxing", "" ], [ "Vaidya", "Nitin", "" ] ]
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1401.3512
Ebrahim Karimi
Hammam Qassim, Filippo M. Miatto, Juan P. Torres, Miles J. Padgett, Ebrahim Karimi, and Robert W. Boyd
Limitations to the determination of a Laguerre-Gauss spectrum via projective, phase-flattening measurement
5 pages, 4 figures
Journal of the Optical Society of America B 31, A20 (2014)
10.1364/JOSAB.31.000A20
null
physics.optics quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
One of the most widely used techniques for measuring the orbital angular momentum components of a light beam is to flatten the spiral phase front of a mode, in order to couple it to a single-mode optical fiber. This method, however, suffers from an efficiency that depends on the orbital angular momentum of the initial mode and on the presence of higher order radial modes. The reason is that once the phase has been flattened, the field retains its ringed intensity pattern and is therefore a nontrivial superposition of purely radial modes, of which only the fundamental one couples to a single mode optical fiber. In this paper, we study the efficiency of this technique both theoretically and experimentally. We find that even for low values of the OAM, a large amount of light can fall outside the fundamental mode of the fiber, and we quantify the losses as functions of the waist of the coupling beam of the orbital angular momentum and radial indices. Our results can be used as a tool to remove the efficiency bias where fair-sampling loopholes are not a concern. However, we hope that our study will encourage the development of better detection methods of the orbital angular momentum content of a beam of light.
[ { "created": "Wed, 15 Jan 2014 08:15:08 GMT", "version": "v1" }, { "created": "Tue, 22 Apr 2014 19:50:27 GMT", "version": "v2" } ]
2014-04-23
[ [ "Qassim", "Hammam", "" ], [ "Miatto", "Filippo M.", "" ], [ "Torres", "Juan P.", "" ], [ "Padgett", "Miles J.", "" ], [ "Karimi", "Ebrahim", "" ], [ "Boyd", "Robert W.", "" ] ]
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1401.3516
Tanja Hartmann
Tanja Hartmann and Andrea Kappes and Dorothea Wagner
Clustering Evolving Networks
46 pages (including 9 pages of references), 4 figures, submission version, to appear in a collection of surveys associated with the DFG Priority Programme "Algorithm Engineering" (SPP 1307)
null
null
null
cs.SI cs.CY physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Roughly speaking, clustering evolving networks aims at detecting structurally dense subgroups in networks that evolve over time. This implies that the subgroups we seek for also evolve, which results in many additional tasks compared to clustering static networks. We discuss these additional tasks and difficulties resulting thereof and present an overview on current approaches to solve these problems. We focus on clustering approaches in online scenarios, i.e., approaches that incrementally use structural information from previous time steps in order to incorporate temporal smoothness or to achieve low running time. Moreover, we describe a collection of real world networks and generators for synthetic data that are often used for evaluation.
[ { "created": "Wed, 15 Jan 2014 08:34:20 GMT", "version": "v1" } ]
2014-01-16
[ [ "Hartmann", "Tanja", "" ], [ "Kappes", "Andrea", "" ], [ "Wagner", "Dorothea", "" ] ]
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1401.3519
Kamlesh Sharma
Kamlesh Sharma, Dr. T.V Prasad
Swar The Voice Operated PC
4 pages, 1 figure
null
null
null
cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Keyboard, although a popular medium, is not very convenient as it requires a certain amount of skill for effective usage. A mouse on the other hand requires a good hand-eye co-ordination. Also current computer interfaces also assume a certain level of literacy from the user. It also expect the user to have certain level of proficiency in English. In our country where the literacy level is as low as 50% in some states, if information technology has to reach the grass root level; these constraints have to be eliminated. As a solution for these, Speech Recognition and hence the concept of Voice operated computer system comes into picture. In this paper we propose a technique to develop a voice recognition system which will be used for controlling computer via speech input from any user i.e. without the use of mouse and / or keyboard. Once developed this system would be of great benefit to physically handicapped people as Instead of scrolling through written procedures on a laptop or handheld computer, they can wear a headset and have their hands and eyes free.
[ { "created": "Wed, 15 Jan 2014 08:58:56 GMT", "version": "v1" } ]
2014-01-16
[ [ "Sharma", "Kamlesh", "" ], [ "Prasad", "Dr. T. V", "" ] ]
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1401.3520
Vahid Jamali
Vahid Jamali, Nikola Zlatanov, and Robert Schober
Adaptive Mode Selection for Bidirectional Relay Networks -- Fixed Rate Transmission
IEEE ICC 2014
null
10.1109/ICC.2014.6884252
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we consider the problem of sum throughput maximization for bidirectional relay networks with block fading. Thereby, user 1 and user 2 exchange information only via a relay node, i.e., a direct link between both users is not present. We assume that channel state information at the transmitter (CSIT) is not available and/or only one coding and modulation scheme is used at the transmitters due to complexity constraints. Thus, the nodes transmit with a fixed predefined rate regardless of the channel state information (CSI). In general, the nodes in the network can assume one of three possible states in each time slot, namely the transmit, receive, and silent state. Most of the existing protocols assume a fixed schedule for the sequence of the states of the nodes. In this paper, we abandon the restriction of having a fixed and predefined schedule and propose a new protocol which, based on the CSI at the receiver (CSIR), selects the optimal states of the nodes in each time slot such that the sum throughput is maximized. To this end, the relay has to be equipped with two buffers for storage of the information received from the two users. Numerical results show that the proposed protocol significantly outperforms the existing protocols.
[ { "created": "Wed, 15 Jan 2014 09:03:07 GMT", "version": "v1" }, { "created": "Wed, 5 Feb 2014 10:41:58 GMT", "version": "v2" } ]
2016-11-15
[ [ "Jamali", "Vahid", "" ], [ "Zlatanov", "Nikola", "" ], [ "Schober", "Robert", "" ] ]
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1401.3521
Ville Syrj\"al\"a
Ville Syrjala, Mikko Valkama, Lauri Anttila, Taneli Riihonen and Dani Korpi
Analysis of Oscillator Phase-Noise Effects on Self-Interference Cancellation in Full-Duplex OFDM Radio Transceivers
Revised manuscript for IEEE Transactions on Wireless Communications, 2014
null
10.1109/TWC.2014.041014.131171
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper addresses the analysis of oscillator phase-noise effects on the self-interference cancellation capability of full-duplex direct-conversion radio transceivers. Closed-form solutions are derived for the power of the residual self-interference stemming from phase noise in two alternative cases of having either independent oscillators or the same oscillator at the transmitter and receiver chains of the full-duplex transceiver. The results show that phase noise has a severe effect on self-interference cancellation in both of the considered cases, and that by using the common oscillator in upconversion and downconversion results in clearly lower residual self-interference levels. The results also show that it is in general vital to use high quality oscillators in full-duplex transceivers, or have some means for phase noise estimation and mitigation in order to suppress its effects. One of the main findings is that in practical scenarios the subcarrier-wise phase-noise spread of the multipath components of the self-interference channel causes most of the residual phase-noise effect when high amounts of self-interference cancellation is desired.
[ { "created": "Wed, 15 Jan 2014 09:05:16 GMT", "version": "v1" } ]
2016-11-15
[ [ "Syrjala", "Ville", "" ], [ "Valkama", "Mikko", "" ], [ "Anttila", "Lauri", "" ], [ "Riihonen", "Taneli", "" ], [ "Korpi", "Dani", "" ] ]
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1401.3525
Bertrand Roehner
Bertrand M. Roehner
Is the month of Ramadan marked by a reduction in the number of suicides?
7 pages, 1 figure
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null
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physics.soc-ph cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For Muslims the month of Ramadan is a time of fasting but during the evenings after sunset it is also an occasion for family and social gatherings. Therefore, according to the Bertillon-Durkheim conception of suicide (that is based on the strength of social ties), one would expect a fall in suicide rates during Ramadan. Is this conjecture confirmed by observation? That is the question addressed in the present paper. Surprisingly, the most tricky part of the investigation was to find reliable monthly suicide data. In the Islamic world Turkey seems to be the only country whose statistical institute publishes such observations. The data reveal indeed a fall of about $15\%$ in suicide numbers during the month of Ramadan (with respect to same-non-Ramadan months). As the standard deviation is only $4.7\%$ this effect has a high degree of significance. This observation, along with the fact that other occasions of social gathering such as Thanksgiving or Christmas are also marked by a drop in suicides, adds further credence to the B-D thesis.
[ { "created": "Wed, 15 Jan 2014 09:17:21 GMT", "version": "v1" } ]
2014-01-16
[ [ "Roehner", "Bertrand M.", "" ] ]
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1401.3527
Guangyue Han
Guangyue Han, Jian Song
Extensions of the I-MMSE Relationship to Gaussian Channels with Feedback and Memory
47 pages
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Unveiling a fundamental link between information theory and estimation theory, the I-MMSE relationship by Guo, Shamai and Verdu~\cite{gu05}, together with its numerous extensions, has great theoretical significance and various practical applications. On the other hand, its influences to date have been restricted to channels without feedback or memory, due to the absence of its extensions to such channels. In this paper, we propose extensions of the I-MMSE relationship to discrete-time and continuous-time Gaussian channels with feedback and/or memory. Our approach is based on a very simple observation, which can be applied to other scenarios, such as a simple and direct proof of the classical de Bruijn's identity. This submission corrects the mistakes in the previous version.
[ { "created": "Wed, 15 Jan 2014 09:26:17 GMT", "version": "v1" }, { "created": "Sun, 5 Jul 2020 09:24:28 GMT", "version": "v2" } ]
2020-07-07
[ [ "Han", "Guangyue", "" ], [ "Song", "Jian", "" ] ]
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1401.3528
Roman Schmeissner
Roman Schmeissner, Valerian Thiel, Cl\'ement Jacquard, Claude Fabre, Nicolas Treps
Analysis and filtering of phase noise in an optical frequency comb at the quantum limit to improve timing measurements
null
null
10.1364/OL.39.003603
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The sensitivity of homodyne timing measurements with femtosecond lasers is only limited by the amplitude and phase noise. We describe a novel method to analyze the phase noise of a Ti:Sapph oscillator relative to the standard quantum limit. The broadband passive cavity used to this aim also filters lowest levels of classical noise at sidebands above 100kHz detection frequency. Leading to quantum limited carrier-envelope-phase noise at $\mu$s-timescales, it can improve the sensitivity of a highly sensitive, homodyne timing jitter measurement by 2 orders of magnitude.
[ { "created": "Wed, 15 Jan 2014 09:28:01 GMT", "version": "v1" }, { "created": "Mon, 3 Feb 2014 08:36:37 GMT", "version": "v2" }, { "created": "Wed, 5 Feb 2014 10:42:16 GMT", "version": "v3" } ]
2015-06-18
[ [ "Schmeissner", "Roman", "" ], [ "Thiel", "Valerian", "" ], [ "Jacquard", "Clément", "" ], [ "Fabre", "Claude", "" ], [ "Treps", "Nicolas", "" ] ]
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1401.3529
Guangyue Han
Xianming Liu, Guangyue Han
Capacity Regions of Families of Continuous-Time Multi-User Gaussian Channels
27 pages
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we propose to use Brownian motions to model families of continuous-time multiuser Gaussian channels without bandwidth limit. It turns out that such a formulation allows parallel translation of many fundamental notions and techniques from the discrete-time setting to the continuous-time regime, which enables us to derive the capacity regions of a continuous-time white Gaussian multiple access channel with/without feedback, a continuous-time white Gaussian interference channel without feedback and a continuous-time white Gaussian broadcast channel without feedback. In theory, these capacity results give the fundamental transmission limit modulation/coding schemes can achieve for families of continuous-time Gaussian one-hop channels without bandwidth limit; in practice, the explicit capacity regions derived and capacity achieving modulation/coding scheme proposed may provide engineering insights on designing multi-user communication systems operating on an ultra-wideband regime.
[ { "created": "Wed, 15 Jan 2014 09:30:45 GMT", "version": "v1" }, { "created": "Fri, 24 Jan 2014 14:10:40 GMT", "version": "v2" }, { "created": "Sun, 28 Jun 2015 02:48:07 GMT", "version": "v3" } ]
2015-06-30
[ [ "Liu", "Xianming", "" ], [ "Han", "Guangyue", "" ] ]
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1401.3530
Ingo Laut
Ingo Laut, Christoph R\"ath, Lisa W\"orner, Vladimir Nosenko, Sergey K. Zhdanov, Jan Schablinski, Dietmar Block, Hubertus M. Thomas, Gregor E. Morfill
Network analysis of 3D complex plasma clusters in a rotating electric field
9 pages, 9 figures; corrected Fig.4 and typos
Phys. Rev. E 89, 023104 (2014)
10.1103/PhysRevE.89.023104
null
physics.plasm-ph physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Network analysis was used to study the structure and time evolution of driven three-dimensional complex plasma clusters. The clusters were created by suspending micron-size particles in a glass box placed on top of the rf electrode in a capacitively coupled discharge. The particles were highly charged and manipulated by an external electric field that had a constant magnitude and uniformly rotated in the horizontal plane. Depending on the frequency of the applied electric field, the clusters rotated in the direction of the electric field or remained stationary. The positions of all particles were measured using stereoscopic digital in-line holography. The network analysis revealed the interplay between two competing symmetries in the cluster. The rotating cluster was shown to be more cylindrical than the nonrotating cluster. The emergence of vertical strings of particles was also confirmed.
[ { "created": "Wed, 15 Jan 2014 09:36:10 GMT", "version": "v1" }, { "created": "Thu, 20 Feb 2014 09:21:13 GMT", "version": "v2" } ]
2014-02-21
[ [ "Laut", "Ingo", "" ], [ "Räth", "Christoph", "" ], [ "Wörner", "Lisa", "" ], [ "Nosenko", "Vladimir", "" ], [ "Zhdanov", "Sergey K.", "" ], [ "Schablinski", "Jan", "" ], [ "Block", "Dietmar", "" ], [ "Thomas", "Hubertus M.", "" ], [ "Morfill", "Gregor E.", "" ] ]
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1401.3531
Ben Fulcher
Ben D. Fulcher and Nick S. Jones
Highly comparative feature-based time-series classification
null
IEEE Trans. Knowl. Data Eng. 26, 3026 (2014)
10.1109/TKDE.2014.2316504
null
cs.LG cs.AI cs.DB physics.data-an q-bio.QM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A highly comparative, feature-based approach to time series classification is introduced that uses an extensive database of algorithms to extract thousands of interpretable features from time series. These features are derived from across the scientific time-series analysis literature, and include summaries of time series in terms of their correlation structure, distribution, entropy, stationarity, scaling properties, and fits to a range of time-series models. After computing thousands of features for each time series in a training set, those that are most informative of the class structure are selected using greedy forward feature selection with a linear classifier. The resulting feature-based classifiers automatically learn the differences between classes using a reduced number of time-series properties, and circumvent the need to calculate distances between time series. Representing time series in this way results in orders of magnitude of dimensionality reduction, allowing the method to perform well on very large datasets containing long time series or time series of different lengths. For many of the datasets studied, classification performance exceeded that of conventional instance-based classifiers, including one nearest neighbor classifiers using Euclidean distances and dynamic time warping and, most importantly, the features selected provide an understanding of the properties of the dataset, insight that can guide further scientific investigation.
[ { "created": "Wed, 15 Jan 2014 09:41:50 GMT", "version": "v1" }, { "created": "Fri, 9 May 2014 00:05:57 GMT", "version": "v2" } ]
2017-11-10
[ [ "Fulcher", "Ben D.", "" ], [ "Jones", "Nick S.", "" ] ]
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1401.3533
Edward Mitchell
E. F. Mitchell, H. M. Ara\'ujo, E. Daly, N. Guerrini, S. Gunes-Lasnet, D. Griffin, A. Marshall, A. Menicucci, T. Morse, O. Poyntz-Wright, R. Turchetta, S. Woodward
The Highly Miniaturised Radiation Monitor
17 pages, 15 figures
null
10.1088/1748-0221/9/07/P07010
null
physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the design and preliminary calibration results of a novel highly miniaturised particle radiation monitor (HMRM) for spacecraft use. The HMRM device comprises a telescopic configuration of active pixel sensors enclosed in a titanium shield, with an estimated total mass of 52 g and volume of 15 cm$^3$. The monitor is intended to provide real-time dosimetry and identification of energetic charged particles in fluxes of up to 10$^8$ cm$^{-2}$ s$^{-1}$ (omnidirectional). Achieving this capability with such a small instrument could open new prospects for radiation detection in space.
[ { "created": "Wed, 15 Jan 2014 09:57:58 GMT", "version": "v1" }, { "created": "Fri, 20 Jun 2014 17:35:32 GMT", "version": "v2" } ]
2015-06-18
[ [ "Mitchell", "E. F.", "" ], [ "Araújo", "H. M.", "" ], [ "Daly", "E.", "" ], [ "Guerrini", "N.", "" ], [ "Gunes-Lasnet", "S.", "" ], [ "Griffin", "D.", "" ], [ "Marshall", "A.", "" ], [ "Menicucci", "A.", "" ], [ "Morse", "T.", "" ], [ "Poyntz-Wright", "O.", "" ], [ "Turchetta", "R.", "" ], [ "Woodward", "S.", "" ] ]
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1401.3538
Dani Korpi
Dani Korpi, Taneli Riihonen, Ville Syrj\"al\"a, Lauri Anttila, Mikko Valkama, Risto Wichman
Full-Duplex Transceiver System Calculations: Analysis of ADC and Linearity Challenges
16 pages, 12 figures
IEEE Transactions on Wireless Communications, vol. 13, no. 7, pp. 3821-3836, July 2014
10.1109/TWC.2014.2315213
null
cs.IT cs.ET math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Despite the intensive recent research on wireless single-channel full-duplex communications, relatively little is known about the transceiver chain nonidealities of full-duplex devices. In this paper, the effect of nonlinear distortion occurring in the transmitter power amplifier (PA) and the receiver chain is analyzed, alongside with the dynamic range requirements of analog-to-digital converters (ADCs). This is done with detailed system calculations, which combine the properties of the individual electronics components to jointly model the complete transceiver chain, including self-interference cancellation. They also quantify the decrease in the dynamic range for the signal of interest caused by self-interference at the analog-to-digital interface. Using these system calculations, we provide comprehensive numerical results for typical transceiver parameters. The analytical results are also confirmed with full waveform simulations. We observe that the nonlinear distortion produced by the transmitter PA is a significant issue in a full-duplex transceiver and, when using cheaper and less linear components, also the receiver chain nonlinearities become considerable. It is also shown that, with digitally-intensive self-interference cancellation, the quantization noise of the ADCs is another significant problem.
[ { "created": "Wed, 15 Jan 2014 10:43:34 GMT", "version": "v1" }, { "created": "Mon, 14 Apr 2014 06:25:35 GMT", "version": "v2" }, { "created": "Mon, 4 Aug 2014 12:19:38 GMT", "version": "v3" } ]
2014-08-05
[ [ "Korpi", "Dani", "" ], [ "Riihonen", "Taneli", "" ], [ "Syrjälä", "Ville", "" ], [ "Anttila", "Lauri", "" ], [ "Valkama", "Mikko", "" ], [ "Wichman", "Risto", "" ] ]
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1401.3541
Habib Sidi b.a.
Habib B.A. Sidi, Zwi Altman and Abdoulaye Tall
Self-Optimizing Mechanisms for EMF Reduction in Heterogeneous Networks
null
null
null
null
cs.NI cs.PF
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper focuses on the exposure to Radio Frequency (RF) Electromagnetic Fields (EMF) and on optimization methods to reduce it. Within the FP7 LEXNET project, an Exposure Index (EI) has been defined that aggregates the essential components that impact exposure to EMF. The EI includes, among other, downlink (DL) exposure induced by the base stations (BSs) and access points, the uplink (UL) exposure induced by the devices in communication, and the corresponding exposure time. Motivated by the EI definition, this paper develops stochastic approximation based self-optimizing algorithm that dynamically adapts the network to reduce the EI in a heterogeneous network with macro- and small cells. It is argued that the increase of the small cells' coverage can, to a certain extent, reduce the EI, but above a certain limit, will deteriorate DL QoS. A load balancing algorithm is formulated that adapts the small cell' coverage based on UL loads and a DL QoS indicator. The proof of convergence of the algorithm is provided and its performance in terms of EI reduction is illustrated through extensive numerical simulations.
[ { "created": "Wed, 15 Jan 2014 10:57:42 GMT", "version": "v1" } ]
2014-01-16
[ [ "Sidi", "Habib B. A.", "" ], [ "Altman", "Zwi", "" ], [ "Tall", "Abdoulaye", "" ] ]
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1401.3549
Andres Santos
Ren\'e D. Rohrmann and Andr\'es Santos
Equation of state of sticky-hard-sphere fluids in the chemical-potential route
13 pages, 7 figures; v2: Results from the zero-separation route have been added
Phys. Rev. E 89, 042121 (2014)
10.1103/PhysRevE.89.042121
null
cond-mat.soft cond-mat.stat-mech physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The coupling-parameter method, whereby an extra particle is progressively coupled to the rest of the particles, is applied to the sticky-hard-sphere fluid to obtain its equation of state in the so-called chemical-potential route ($\mu$ route). As a consistency test, the results for one-dimensional sticky particles are shown to be exact. Results corresponding to the three-dimensional case (Baxter's model) are derived within the Percus-Yevick approximation by using different prescriptions for the dependence of the interaction potential of the extra particle on the coupling parameter. The critical point and the coexistence curve of the gas-liquid phase transition are obtained in the $\mu$ route and compared with predictions from other thermodynamics routes and from computer simulations. The results show that the $\mu$ route yields a general better description than the virial, energy, compressibility, and zero-separation routes.
[ { "created": "Wed, 15 Jan 2014 11:21:15 GMT", "version": "v1" }, { "created": "Mon, 14 Apr 2014 15:18:22 GMT", "version": "v2" } ]
2014-04-15
[ [ "Rohrmann", "René D.", "" ], [ "Santos", "Andrés", "" ] ]
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1401.3554
Abhishek Jain
Abhishek Jain, Piyush Kumar Gupta, Dr. Hima Gupta and Sachish Dhar
Accelerating SystemVerilog UVM Based VIP to Improve Methodology for Verification of Image Signal Processing Designs Using HW Emulator
International Journal of VLSI design & Communication Systems (VLSICS)
null
null
null
cs.OH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we present the development of Acceleratable UVCs from standard UVCs in SystemVerilog and their usage in UVM based Verification Environment of Image Signal Processing designs to increase run time performance. This paper covers development of Acceleratable UVCs from standard UVCs for internal control and data buses of ST imaging group by partitioning of transaction-level components and cycle-accurate signal-level components between the software simulator and hardware accelerator respectively. Standard Co-Emulation API: Modeling Interface (SCE-MI) compliant, transaction-level communications link between test benches running on a host system and Emulation machine is established. Accelerated Verification IPs are used at UVM based Verification Environment of Image Signal Processing designs both with simulator and emulator as UVM acceleration is an extension of the standard simulation-only UVM and is fully backward compatible with it. Acceleratable UVCs significantly reduces development schedule risks while leveraging transaction models used during simulation. In this paper, we discuss our experiences on UVM based methodology adoption on TestBench-Xpress(TBX) based technology step by step. We are also doing comparison between the run time performance results from earlier simulator-only environment and the new, hardware-accelerated environment. Although this paper focuses on Acceleratable UVCs development and their usage for image signal processing designs, Same concept can be extended for non-image signal processing designs. KEYWORDS- SystemVerilog, Universal Verification Methodology (UVM), TestBench-Xpress (TBX), Universal Verification Component (UVC), Standard Co-Emulation API: Modelling Interface (SCE-MI), Acceleratable UVC, Emulator, XRTL Tasks/Functions (xtf), Transactor interface (tif), Verification IP (VIP).
[ { "created": "Wed, 15 Jan 2014 11:58:56 GMT", "version": "v1" } ]
2014-01-16
[ [ "Jain", "Abhishek", "" ], [ "Gupta", "Piyush Kumar", "" ], [ "Gupta", "Dr. Hima", "" ], [ "Dhar", "Sachish", "" ] ]
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1401.3556
Sergiy Vorobyov A.
Alex E. Geyer, Reza Nikjah, Sergiy A. Vorobyov, and Norman C. Beaulieu
Equivalent Codes, Optimality, and Performance Analysis of OSTBC: Textbook Study
33 pages, 12 figures, 5 tables, full size journal paper, Finished in Oct. 2009, Unpublished
IEEE Trans. Communications, vol. 63, no. 8, pp. 2912-2923, Aug. 2015
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An equivalent model for a multi-input multi-output (MIMO) communication system with orthogonal space-time block codes (OSTBCs) is proposed based on a newly revealed connection between OSTBCs and Euclidean codes. Examples of distance spectra, signal constellations, and signal coordinate diagrams of Euclidean codes equivalent to simplest OSTBCs are given. A new asymptotic upper bound for the symbol error rate (SER) of OSTBCs, based on the distance spectra of the introduced equivalent Euclidean codes is derived, and new general design criteria for signal constellations of the optimal OSTBC are proposed. Some bounds relating distance properties, dimensionality, and cardinality of OSTBCs with constituent signals of equal energy are given, and new optimal signal constellations with cardinalities M = 8 and M = 16 for Alamouti's code are designed. Using the new model for MIMO communication systems with OSTBCs, a general methodology for performance analysis of OSTBCs is developed. As an example of the application of this methodology, an exact evaluation of the SER of any OSTBC is given. Namely, a new expression for the SER of Alamouti's OSTBC with binary phase shift keying (BPSK) signals is derived.
[ { "created": "Wed, 15 Jan 2014 12:07:56 GMT", "version": "v1" } ]
2016-03-03
[ [ "Geyer", "Alex E.", "" ], [ "Nikjah", "Reza", "" ], [ "Vorobyov", "Sergiy A.", "" ], [ "Beaulieu", "Norman C.", "" ] ]
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1401.3566
Sergiy Vorobyov A.
Omid Taheri, Sergiy A. Vorobyov
Reweighted l1-norm Penalized LMS for Sparse Channel Estimation and Its Analysis
28 pages, 4 figures, 1 table, Submitted to Signal Processing on June 2013
O. Taheri and S.A. Vorobyov, "Reweighted l1-norm penalized LMS for sparse channel estimation and its analysis," Signal Processing, vol. 104, pp. 70-79, Nov. 2014
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new reweighted l1-norm penalized least mean square (LMS) algorithm for sparse channel estimation is proposed and studied in this paper. Since standard LMS algorithm does not take into account the sparsity information about the channel impulse response (CIR), sparsity-aware modifications of the LMS algorithm aim at outperforming the standard LMS by introducing a penalty term to the standard LMS cost function which forces the solution to be sparse. Our reweighted l1-norm penalized LMS algorithm introduces in addition a reweighting of the CIR coefficient estimates to promote a sparse solution even more and approximate l0-pseudo-norm closer. We provide in depth quantitative analysis of the reweighted l1-norm penalized LMS algorithm. An expression for the excess mean square error (MSE) of the algorithm is also derived which suggests that under the right conditions, the reweighted l1-norm penalized LMS algorithm outperforms the standard LMS, which is expected. However, our quantitative analysis also answers the question of what is the maximum sparsity level in the channel for which the reweighted l1-norm penalized LMS algorithm is better than the standard LMS. Simulation results showing the better performance of the reweighted l1-norm penalized LMS algorithm compared to other existing LMS-type algorithms are given.
[ { "created": "Wed, 15 Jan 2014 13:03:43 GMT", "version": "v1" } ]
2014-05-09
[ [ "Taheri", "Omid", "" ], [ "Vorobyov", "Sergiy A.", "" ] ]
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1401.3567
Youssef Khmou
Y.Khmou, S.Safi
2D Direction Of Arrival Estimation with Modified Propagator
4 pages, one latex file, 3 figures
null
null
null
cs.IT math.IT stat.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, a fast algorithm for the Direction Of Arrival (DOA) estimation of radiating sources, based on partial covariance matrix and without eigende- composition of incoming signals is extended to two dimensional problem of joint azimuth and elevation estimation angles using Uniform Circular Array (UCA) in case of non coherent narrowband signals. Simulation results are presented with both Additive White Gaussian Noise (AWGN) and real symmetric Toeplitz noise.
[ { "created": "Wed, 15 Jan 2014 13:07:52 GMT", "version": "v1" } ]
2015-03-18
[ [ "Khmou", "Y.", "" ], [ "Safi", "S.", "" ] ]
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1401.3569
Sergiy Vorobyov A.
Jie Gao, Sergiy A. Vorobyov, and Hai Jiang
Efficient Strategies for Single/Multi-Target Jamming on MIMO Gaussian Channels
24 pages, 5 figures, Submitted to IEEE Trans. Signal Processing on December 2013
IEEE Trans. Signal Processing, vol. 63, no. 21, pp. 5821-5836, Nov. 2015
10.1109/TSP.2015.2457398
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The problem of jamming on multiple-input multiple-output (MIMO) Gaussian channels is investigated in this paper. In the case of a single target legitimate signal, we show that the existing result based on the simplification of the system model by neglecting the jamming channel leads to losing important insights regarding the effect of jamming power and jamming channel on the jamming strategy. We find a closed-form optimal solution for the problem under a positive semi-definite (PSD) condition without considering simplifications in the model. If the condition is not satisfied and the optimal solution may not exist in closed-form, we find the optimal solution using a numerical method and also propose a suboptimal solution in closed-form as a close approximation of the optimal solution. Then, the possibility of extending the results to solve the problem of multi-target jamming is investigated for four scenarios, i.e., multiple access channel, broadcasting channel, multiple transceiver pairs with orthogonal transmissions, and multiple transceiver pairs with interference, respectively. It is shown that the proposed numerical method can be extended to all scenarios while the proposed closed-form solutions for jamming may be applied in the scenarios of the multiple access channel and multiple transceiver pairs with orthogonal transmissions. Simulation results verify the effectiveness of the proposed solutions.
[ { "created": "Wed, 15 Jan 2014 13:10:33 GMT", "version": "v1" } ]
2016-03-03
[ [ "Gao", "Jie", "" ], [ "Vorobyov", "Sergiy A.", "" ], [ "Jiang", "Hai", "" ] ]
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1401.3577
Costantino Sigismondi
Costantino Sigismondi
La meridiana di Egnazio Danti nella Torre dei Venti in Vaticano: un'icona della riforma Gregoriana del calendario
11 pages, 5 figures and 1 table. Text in Italian
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physics.hist-ph astro-ph.IM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The meridian line traced by Egnazio Danti in the Torre dei Venti in Vatican demostrated the need of the Gregorian Reformation of the Calendar. A review on this instrument is presented, along with the astrometric recognition. This meridian line, dated 1580, is deviated of 72 arcminutes Westward from the true North.
[ { "created": "Tue, 14 Jan 2014 14:39:51 GMT", "version": "v1" } ]
2014-01-16
[ [ "Sigismondi", "Costantino", "" ] ]
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1401.3586
Joran Rolland
Joran Rolland
Turbulent spot growth in plane Couette flow: statistical study and formation of spanwise vorticity
10 pages, 9 figures
Fluid Dyn. Res. volume 46, page 015512 (2014)
10.1088/0169-5983/46/1/015512
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This article presents direct numerical simulations of the growth of turbulent spots in the transitional regime of plane Couette flow. A quantitative description of the growth process and of the detail of the quadrupolar flow around the spot is given. Focus is put on formation of spanwise vorticity in the velocity streaks that resembles a secondary shear instability. The main features of the instability (coherence lengths, advection velocity) are studied in the context of the turbulent spot, below and above the threshold Reynolds number of appearance of the oblique turbulent bands of plane Couette flow.
[ { "created": "Wed, 15 Jan 2014 13:52:03 GMT", "version": "v1" } ]
2014-01-16
[ [ "Rolland", "Joran", "" ] ]
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1401.3587
Mahashweta Basu
Mahashweta Basu
Communities of dense weighted networks: MicroRNA co-target network as an example
14 pages, 6 eps figures
null
null
null
q-bio.MN physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Complex networks are intrinsically modular. Resolving small modules is particularly difficult when the network is densely connected; wide variation of link weights invites additional complexities. In this article we present an algorithm to detect community structure in densely connected weighted networks. First, modularity of the network is calculated by erasing the links having weights smaller than a cutoff $q.$ Then one takes all the disjoint components obtained at $q=q_c,$ where the modularity is maximum, and modularize the components individually using Newman Girvan's algorithm for weighted networks. We show, taking microRNA (miRNA) co-target network of Homo sapiens as an example, that this algorithm could reveal miRNA modules which are known to be relevant in biological context.
[ { "created": "Wed, 15 Jan 2014 13:52:47 GMT", "version": "v1" } ]
2014-01-16
[ [ "Basu", "Mahashweta", "" ] ]
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1401.3588
Swen Jacobs
Swen Jacobs (Graz University of Technology), Roderick Bloem (Graz University of Technology)
Parameterized Synthesis
Extended version of TACAS 2012 paper, 29 pages
Logical Methods in Computer Science, Volume 10, Issue 1 (February 13, 2014) lmcs:736
10.2168/LMCS-10(1:12)2014
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the synthesis problem for distributed architectures with a parametric number of finite-state components. Parameterized specifications arise naturally in a synthesis setting, but thus far it was unclear how to detect realizability and how to perform synthesis in a parameterized setting. Using a classical result from verification, we show that for a class of specifications in indexed LTL\X, parameterized synthesis in token ring networks is equivalent to distributed synthesis in a network consisting of a few copies of a single process. Adapting a well-known result from distributed synthesis, we show that the latter problem is undecidable. We describe a semi-decision procedure for the parameterized synthesis problem in token rings, based on bounded synthesis. We extend the approach to parameterized synthesis in token-passing networks with arbitrary topologies, and show applicability on a simple case study. Finally, we sketch a general framework for parameterized synthesis based on cutoffs and other parameterized verification techniques.
[ { "created": "Wed, 15 Jan 2014 13:53:05 GMT", "version": "v1" }, { "created": "Wed, 12 Feb 2014 10:43:18 GMT", "version": "v2" } ]
2015-07-01
[ [ "Jacobs", "Swen", "", "Graz University of Technology" ], [ "Bloem", "Roderick", "", "Graz\n University of Technology" ] ]
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1401.3590
Karim Mahmoud
Karim M. Mahmoud
An Enhanced Method For Evaluating Automatic Video Summaries
This paper has been withdrawn by the author due to some errors and incomplete study
null
null
null
cs.CV cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Evaluation of automatic video summaries is a challenging problem. In the past years, some evaluation methods are presented that utilize only a single feature like color feature to detect similarity between automatic video summaries and ground-truth user summaries. One of the drawbacks of using a single feature is that sometimes it gives a false similarity detection which makes the assessment of the quality of the generated video summary less perceptual and not accurate. In this paper, a novel method for evaluating automatic video summaries is presented. This method is based on comparing automatic video summaries generated by video summarization techniques with ground-truth user summaries. The objective of this evaluation method is to quantify the quality of video summaries, and allow comparing different video summarization techniques utilizing both color and texture features of the video frames and using the Bhattacharya distance as a dissimilarity measure due to its advantages. Our Experiments show that the proposed evaluation method overcomes the drawbacks of other methods and gives a more perceptual evaluation of the quality of the automatic video summaries.
[ { "created": "Tue, 14 Jan 2014 09:30:44 GMT", "version": "v1" }, { "created": "Wed, 30 Apr 2014 23:04:43 GMT", "version": "v2" }, { "created": "Tue, 19 Apr 2016 16:05:08 GMT", "version": "v3" } ]
2016-04-20
[ [ "Mahmoud", "Karim M.", "" ] ]
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1401.3592
Ayman Bahaa-Eldin
Ayman M. Bahaa-Eldin
Intelligent Systems for Information Security
PhD Thesis. Ain Shams University, Faculty of Engineering. Computer and Systems Eng. Dept., 2004
null
null
null
cs.NE cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This thesis aims to use intelligent systems to extend and improve performance and security of cryptographic techniques. Genetic algorithms framework for cryptanalysis problem is addressed. A novel extension to the differential cryptanalysis using genetic algorithm is proposed and a fitness measure based on the differential characteristics of the cipher being attacked is also proposed. The complexity of the proposed attack is shown to be less than quarter of normal differential cryptanalysis of the same cipher by applying the proposed attack to both the basic Substitution Permutation Network and the Feistel Network. The basic models of modern block ciphers are attacked instead of actual cipher to prove that the attack is applicable to other ciphers vulnerable to differential cryptanalysis. A new attack for block cipher based on the ability of neural networks to perform an approximation of mapping is proposed. A complete problem formulation is explained and implementation of the attack on some hypothetical Feistel cipher not vulnerable to differential or linear attacks is presented. A new block cipher based on the neural networks is proposed. A complete cipher structure is given and a key scheduling is also shown. The main properties of neural network being able to perform mapping between large dimension domains in a very fast and a very small memory compared to S-Boxes is used as a base for the cipher.
[ { "created": "Wed, 15 Jan 2014 14:00:36 GMT", "version": "v1" } ]
2014-01-16
[ [ "Bahaa-Eldin", "Ayman M.", "" ] ]
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1401.3607
Larry Bull
Larry Bull
A Brief History of Learning Classifier Systems: From CS-1 to XCS
37 pages, 9 figures
null
null
null
cs.NE cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Modern Learning Classifier Systems can be characterized by their use of rule accuracy as the utility metric for the search algorithm(s) discovering useful rules. Such searching typically takes place within the restricted space of co-active rules for efficiency. This paper gives an historical overview of the evolution of such systems up to XCS, and then some of the subsequent developments of XCS to different types of learning.
[ { "created": "Wed, 15 Jan 2014 14:37:48 GMT", "version": "v1" }, { "created": "Fri, 7 Feb 2014 11:55:12 GMT", "version": "v2" } ]
2014-02-10
[ [ "Bull", "Larry", "" ] ]
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1401.3613
Hector Zenil
Hector Zenil
Turing Minimalism and the Emergence of Complexity
As accepted The Rutherford Journal - The New Zealand Journal for the History and Philosophy of Science and Technology
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null
null
cs.CC cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Not only did Turing help found one of the most exciting areas of modern science (computer science), but it may be that his contribution to our understanding of our physical reality is greater than we had hitherto supposed. Here I explore the path that Alan Turing would have certainly liked to follow, that of complexity science, which was launched in the wake of his seminal work on computability and structure formation. In particular, I will explain how the theory of algorithmic probability based on Turing's universal machine can also explain how structure emerges at the most basic level, hence reconnecting two of Turing's most cherished topics: computation and pattern formation.
[ { "created": "Wed, 15 Jan 2014 14:49:28 GMT", "version": "v1" }, { "created": "Thu, 31 Jul 2014 00:24:46 GMT", "version": "v2" } ]
2014-08-01
[ [ "Zenil", "Hector", "" ] ]
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1401.3614
Vincenzo De Florio
Vincenzo De Florio, Chris Blondia
Reflective and Refractive Variables: A Model for Effective and Maintainable Adaptive-and-Dependable Software
Proc. of the 33rd Euromicro Conference on Software Engineering and Advanced Applications (SEEA 2007), L\"ubeck, Germany, August 27-31 2007
null
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a simple and effective tool for the expression of tasks such as cross-layer optimization strategies or sensors-related applications. The approach is based on what we refer to as "reflective and refractive variables". Both types of variables are associated with external entities, e.g. sensors or actuators. A reflective variable is a volatile variable, that is, a variable that might be concurrently modified by multiple threads. A library of threads is made available, each of which interfaces a set of sensors and continuously update the value of a corresponding set of sensors. One such thread is "cpu", which exports the current level of usage of the local CPU as an integer between 0 and 100. This integer is reflected into the integer reflective variable cpu. A refractive variable is a reflective variable that can be modified. Each modification is caught and interpreted as a request to change the value of an actuator. For instance, setting variable "tcp_sendrate" would request a cross-layer adjustment to the thread interfacing the local TCP layer entity. This allows express in an easy way complex operations in the application layer of any programming language, e.g. plain old C. We describe our translator and the work we are carrying out within PATS to build simple and powerful libraries of scripts based on reflective and refractive variables, including robotics applications and RFID tags processing.
[ { "created": "Wed, 15 Jan 2014 14:51:03 GMT", "version": "v1" } ]
2014-01-16
[ [ "De Florio", "Vincenzo", "" ], [ "Blondia", "Chris", "" ] ]
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1401.3617
Sanjay Vishwakarma
Sanjay Vishwakarma, A. Chockalingam
Power Allocation in MIMO Wiretap Channel with Statistical CSI and Finite-Alphabet Input
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we consider the problem of power allocation in MIMO wiretap channel for secrecy in the presence of multiple eavesdroppers. Perfect knowledge of the destination channel state information (CSI) and only the statistical knowledge of the eavesdroppers CSI are assumed. We first consider the MIMO wiretap channel with Gaussian input. Using Jensen's inequality, we transform the secrecy rate max-min optimization problem to a single maximization problem. We use generalized singular value decomposition and transform the problem to a concave maximization problem which maximizes the sum secrecy rate of scalar wiretap channels subject to linear constraints on the transmit covariance matrix. We then consider the MIMO wiretap channel with finite-alphabet input. We show that the transmit covariance matrix obtained for the case of Gaussian input, when used in the MIMO wiretap channel with finite-alphabet input, can lead to zero secrecy rate at high transmit powers. We then propose a power allocation scheme with an additional power constraint which alleviates this secrecy rate loss problem, and gives non-zero secrecy rates at high transmit powers.
[ { "created": "Wed, 15 Jan 2014 14:52:32 GMT", "version": "v1" } ]
2014-01-16
[ [ "Vishwakarma", "Sanjay", "" ], [ "Chockalingam", "A.", "" ] ]
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1401.3621
Vincenzo De Florio
Vincenzo De Florio and Chris Blondia
Service-oriented Communities: Visions and Contributions towards Social Organizations
Proc. of the Fifth Int.l Workshop on MObile and NEtworking Technologies for social applications (MONET 2010), Lecture Notes in Computer Science, Volume 6428/2010, pp. 319-328, October 25-29, 2010, Crete, Greece
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cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
With the increase of the populations, resources are becoming scarcer, and a smarter way to make use of them becomes a vital necessity of our societies. On the other hand, resource management is traditionally carried out through well established organizations, policies, and regulations that are often considered as impossible to restructure. Our position is that merely expanding the traditional approaches might not be enough. Systems must be radically rethought in order to achieve a truly effective and rational use of the available resources. Classical concepts such as demand and supply need to be rethought as well, as they operate artificial classifications that limit the true potential of systems and organizations. In what follows we propose our vision to future, "smarter" systems able to overcome the limitations of the status quo. Such systems require what Boulding called "gestalts," namely concepts able to "directing research towards the gaps which they reveal". In this paper we elaborate on this and show how such gestalts can pave the way towards novel reformulations of traditional services able to reach a better and more sensible management of the available resources and cope with their scarcity. Our vision of a Service-oriented Community is also introduced. We believe that such communities---in heterarchical coexistence with traditional systems---provide the necessary diversity and innovation orientation to prevent societal lock-ins such as the ones we are experiencing in assisting our elderly ones.
[ { "created": "Wed, 15 Jan 2014 15:06:13 GMT", "version": "v1" } ]
2014-01-16
[ [ "De Florio", "Vincenzo", "" ], [ "Blondia", "Chris", "" ] ]
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1401.3623
Ankit Mundra
Ankit Mundra, Geetanjali Rathee, Meenu Chawla, Nitin Rakesh, Ashsutosh Soni
Transport Information System using Query Centric Cyber Physical Systems (QCPS)
5 pages, 4 Figures
International Journal of Computer Applications 85(3):12-16, January 2014. Published by Foundation of Computer Science, New York, USA
10.5120/14820-3050
null
cs.OH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
To incorporate the computation and communication with the physical world, next generation architecture i.e. CPS is viewed as a new technology. To improve the better interaction with the physical world or to perk up the electricity delivery usage, various CPS based approaches have been introduced. Recently several GPS equipped smart phones and sensor based frameworks have been proposed which provide various services i.e. environment estimation, road safety improvement but encounter certain limitations like elevated energy consumption and high computation cost. To meet the high reliability and safety requirements, this paper introduces a novel approach based on QCPS model which provides several users services (discussed in this paper). Further, this paper proposed a Transport Information System (TIS), which provide the communication with lower cost overhead by arranging the similar sensors in the form of grids. Each grid has a coordinator which interacts with cloud to process the user query. In order to evaluate the performance of proposed approach we have implemented a test bed of 16 wireless sensor nodes and have shown the performance in terms of computation and communication cost.
[ { "created": "Wed, 15 Jan 2014 15:19:42 GMT", "version": "v1" } ]
2014-01-16
[ [ "Mundra", "Ankit", "" ], [ "Rathee", "Geetanjali", "" ], [ "Chawla", "Meenu", "" ], [ "Rakesh", "Nitin", "" ], [ "Soni", "Ashsutosh", "" ] ]
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1401.3626
Diederik Aerts
Diederik Aerts and Sandro Sozzo
Modeling Concept Combinations in a Quantum-theoretic Framework
5 pages. arXiv admin note: substantial text overlap with arXiv:1311.6050
Advances in Cognitive Neurodynamics (IV), pp 393-399, 2014
10.1007/978-94-017-9548-7_55
null
cs.AI quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present modeling for conceptual combinations which uses the mathematical formalism of quantum theory. Our model faithfully describes a large amount of experimental data collected by different scholars on concept conjunctions and disjunctions. Furthermore, our approach sheds a new light on long standing drawbacks connected with vagueness, or fuzziness, of concepts, and puts forward a completely novel possible solution to the 'combination problem' in concept theory. Additionally, we introduce an explanation for the occurrence of quantum structures in the mechanisms and dynamics of concepts and, more generally, in cognitive and decision processes, according to which human thought is a well structured superposition of a 'logical thought' and a 'conceptual thought', and the latter usually prevails over the former, at variance with some widespread beliefs
[ { "created": "Wed, 15 Jan 2014 15:27:04 GMT", "version": "v1" } ]
2015-12-31
[ [ "Aerts", "Diederik", "" ], [ "Sozzo", "Sandro", "" ] ]
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1401.3627
Vincenzo De Florio
Ning Gui, Vincenzo De Florio, Hong Sun, Chris Blondia
A Service-oriented Infrastructure Approach for Mutual Assistance Communities
Proc. of the First IEEE WoWMoM Workshop on Adaptive and DependAble Mission- and bUsiness-critical mobile Systems (ADAMUS'07), Helsinki, Finland, June 18, 2007
null
null
null
cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Elder people are becoming a predominant aspect of our societies. As such, solutions both efficacious and cost-effective need to be sought. This paper proposes a service-oriented infrastructure approach to this problem. We propose an open and integrated service infrastructure to orchestrate the available resources (smart devices, professional carers, informal carers) to help elder or disabled people. Main characteristic of our design is the explicitly support of dynamically available service providers such as informal carers. By modeling the service description as Semantic Web Services, the service request can automatically be discovered, reasoned about and mapped onto the pool of heterogeneous service providers. We expect our approach to be able to efficiently utilize the available service resources, enrich the service options, and best match the requirements of the requesters.
[ { "created": "Wed, 15 Jan 2014 15:29:29 GMT", "version": "v1" } ]
2014-01-16
[ [ "Gui", "Ning", "" ], [ "De Florio", "Vincenzo", "" ], [ "Sun", "Hong", "" ], [ "Blondia", "Chris", "" ] ]
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1401.3632
Shaan Qamar
Shaan Qamar, Rajarshi Guhaniyogi, David B. Dunson
Bayesian Conditional Density Filtering
41 pages, 7 figures, 12 tables
null
null
null
stat.ML cs.LG stat.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a Conditional Density Filtering (C-DF) algorithm for efficient online Bayesian inference. C-DF adapts MCMC sampling to the online setting, sampling from approximations to conditional posterior distributions obtained by propagating surrogate conditional sufficient statistics (a function of data and parameter estimates) as new data arrive. These quantities eliminate the need to store or process the entire dataset simultaneously and offer a number of desirable features. Often, these include a reduction in memory requirements and runtime and improved mixing, along with state-of-the-art parameter inference and prediction. These improvements are demonstrated through several illustrative examples including an application to high dimensional compressed regression. Finally, we show that C-DF samples converge to the target posterior distribution asymptotically as sampling proceeds and more data arrives.
[ { "created": "Wed, 15 Jan 2014 15:40:40 GMT", "version": "v1" }, { "created": "Thu, 16 Oct 2014 21:47:00 GMT", "version": "v2" }, { "created": "Tue, 22 Sep 2015 07:41:00 GMT", "version": "v3" } ]
2015-09-23
[ [ "Qamar", "Shaan", "" ], [ "Guhaniyogi", "Rajarshi", "" ], [ "Dunson", "David B.", "" ] ]
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Bayesian Conditional Density Filtering
http://arxiv.org/abs/1401.3632v3
http://arxiv.org/pdf/1401.3632v3.pdf
https://github.com/rajguhaniyogi/Bayesian-Conditional-Density-Filtering
false
false
https://paperswithcode.com/paper/bayesian-conditional-density-filtering
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1401.3648
Andree-Aimee Toucas
David Perrin (CIS-ENSMSE, STBio-ENSMSE, LGF-ENSMSE, IFRESIS-ENSMSE), Pierre Badel (CIS-ENSMSE, STBio-ENSMSE, LGF-ENSMSE, IFRESIS-ENSMSE), St\'ephane Avril (CIS-ENSMSE, STBio-ENSMSE, LGF-ENSMSE, IFRESIS-ENSMSE), Jean-No\"el Albertini (DCV), Laurent Org\'eas (3S-R), Christian Geindreau (3S-R), Aur\'elien Dumenil (CIT), Cemil Goksu (CIT)
Patient-specific simulation of stent-graft deployment within an abdominal aortic aneurysm
null
3rd International Conference on Computational and Mathematical Biomedical Engineering, 16 au 18 d\'ecembre 2013, Hong Kong, Kowloon Hong Kong : Hong Kong (2013)
null
PB-CMBE-13.pdf
physics.med-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this study, finite element analysis is used to simulate the surgical deployment procedure of a bifurcated stent-graft on a real patient's arterial geometry. The stent-graft is modeled using realistic constitutive properties for both the stent and most importantly for the graft. The arterial geometry is obtained from pre-operative imaging exam. The obtained results are in good agreement with the post-operative imaging data. As the whole computational time was reduced to less than 2 hours, this study constitutes an essential step towards predictive planning simulations of aneurysmal endovascular surgery
[ { "created": "Wed, 15 Jan 2014 16:07:30 GMT", "version": "v1" } ]
2014-01-16
[ [ "Perrin", "David", "", "CIS-ENSMSE, STBio-ENSMSE, LGF-ENSMSE, IFRESIS-ENSMSE" ], [ "Badel", "Pierre", "", "CIS-ENSMSE, STBio-ENSMSE, LGF-ENSMSE, IFRESIS-ENSMSE" ], [ "Avril", "Stéphane", "", "CIS-ENSMSE, STBio-ENSMSE, LGF-ENSMSE, IFRESIS-ENSMSE" ], [ "Albertini", "Jean-Noël", "", "DCV" ], [ "Orgéas", "Laurent", "", "3S-R" ], [ "Geindreau", "Christian", "", "3S-R" ], [ "Dumenil", "Aurélien", "", "CIT" ], [ "Goksu", "Cemil", "", "CIT" ] ]
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1401.3654
Paulo Feofiloff
Ernesto G. Birgin, Paulo Feofiloff, Cristina G. Fernandes, Everton L. de Melo, Marcio T. I. Oshiro and D\'ebora P. Ronconi
A MILP model for an extended version of the Flexible Job Shop Problem
15 pages, 2 figures, 4 tables. Optimization Letters, 2013
null
10.1007/S11590-013-0669-7
null
cs.DS cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A MILP model for an extended version of the Flexible Job Shop Scheduling problem is proposed. The extension allows the precedences between operations of a job to be given by an arbitrary directed acyclic graph rather than a linear order. The goal is the minimization of the makespan. Theoretical and practical advantages of the proposed model are discussed. Numerical experiments show the performance of a commercial exact solver when applied to the proposed model. The new model is also compared with a simple extension of the model described by \"Ozg\"uven, \"Ozbakir, and Yavuz (Mathematical models for job-shop scheduling problems with routing and process plan flexibility, Applied Mathematical Modelling, 34:1539--1548, 2010), using instances from the literature and instances inspired by real data from the printing industry.
[ { "created": "Wed, 15 Jan 2014 16:23:12 GMT", "version": "v1" } ]
2014-01-16
[ [ "Birgin", "Ernesto G.", "" ], [ "Feofiloff", "Paulo", "" ], [ "Fernandes", "Cristina G.", "" ], [ "de Melo", "Everton L.", "" ], [ "Oshiro", "Marcio T. I.", "" ], [ "Ronconi", "Débora P.", "" ] ]
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1401.3656
Linus Stegbauer
Linus Stegbauer, Katharina Schwinghammer, Bettina V. Lotsch
A Hydrazone-based Covalent Organic Framework for Photocatalytic Hydrogen Production
Main Paper (5 pages, 5 figures)and Electronic supporting information (23 pages, 20 Figures, 6 schemes)
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null
null
cond-mat.mtrl-sci physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Covalent organic frameworks (COFs) have recently emerged as a new generation of porous polymers combining molecular functionality with the robustness and structural definition of crystalline solids. Drawing on the recent development of tailor-made semiconducting COFs, we here report on a new COF capable of visible-light driven hydrogen generation. The COF is based on hydrazone-linked functionalized triazine and phenyl building blocks and adopts a layered structure with a honeycomb-type lattice featuring mesopores of 3.8 nm and the highest surface area among all hydrazone-based COFs reported to date. When illuminated with visible light, the COF continuously produces hydrogen from water without signs of degradation. With their precise molecular organization and modular structure combined with high porosity, photoactive COFs represent well-defined model systems to study and adjust the molecular entities central to the photocatalyic process.
[ { "created": "Wed, 15 Jan 2014 16:30:21 GMT", "version": "v1" } ]
2014-01-16
[ [ "Stegbauer", "Linus", "" ], [ "Schwinghammer", "Katharina", "" ], [ "Lotsch", "Bettina V.", "" ] ]
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1401.3659
Hadi Ahmadi
Hadi Ahmadi and Reihaneh Safavi-Naini
Multipath Private Communication: An Information Theoretic Approach
null
null
null
null
cs.CR cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Sending private messages over communication environments under surveillance is an important challenge in communication security and has attracted attentions of cryptographers through time. We believe that resources other than cryptographic keys can be used for communication privacy. We consider private message transmission (PMT) in an abstract multipath communication model between two communicants, Alice and Bob, in the presence of an eavesdropper, Eve. Alice and Bob have pre-shared keys and Eve is computationally unbounded. There are a total of $n$ paths and the three parties can have simultaneous access to at most $t_a$, $t_b$, and $t_e$ paths. The parties can switch their paths after every $\lambda$ bits of communication. We study perfect (P)-PMT versus asymptotically-perfect (AP)-PMT protocols. The former has zero tolerance of transmission error and leakage, whereas the latter allows for positive error and leakage that tend to zero as the message length increases. We derive the necessary and sufficient conditions under which P-PMT and AP-PMT are possible. We also introduce explicit P-PMT and AP-PMT constructions. Our results show AP-PMT protocols attain much higher information rates than P-PMT ones. Interestingly, AP-PMT is possible even in poorest condition where $t_a=t_b=1$ and $t_e=n-1$. It remains however an open question whether the derived rates can be improved by more sophisticated AP-PMT protocols. We study applications of our results to private communication over the real-life scenarios of multiple-frequency links and multiple-route networks. We show practical examples of such scenarios that can be abstracted by the multipath setting: Our results prove the possibility of keyless information-theoretic private message transmission at rates $17\%$ and $20\%$ for the two example scenarios, respectively. We discuss open problems and future work at the end.
[ { "created": "Wed, 15 Jan 2014 16:48:08 GMT", "version": "v1" } ]
2014-01-16
[ [ "Ahmadi", "Hadi", "" ], [ "Safavi-Naini", "Reihaneh", "" ] ]
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1401.3660
Andrea Munari
Andrea Munari, Michael Heindlmaier, Gianluigi Liva, Matteo Berioli
The Throughput of Slotted Aloha with Diversity
Accepted for publications at 51st Annual Allerton Conference on Communication, Control, and Computing
null
null
null
cs.NI cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, a simple variation of classical Slotted Aloha is introduced and analyzed. The enhancement relies on adding multiple receivers that gather different observations of the packets transmitted by a user population in one slot. For each observation, the packets transmitted in one slot are assumed to be subject to independent on-off fading, so that each of them is either completely faded, and then does not bring any power or interference at the receiver, or it arrives unfaded, and then may or may not, collide with other unfaded transmissions. With this model, a novel type of diversity is introduced to the conventional SA scheme, leading to relevant throughput gains already for moderate number of receivers. The analytical framework that we introduce allows to derive closed-form expression of both throughput and packet loss rate an arbitrary number of receivers, providing interesting hints on the key trade-offs that characterize the system. We then focus on the problem of having receivers forward the full set of collected packets to a final gateway using the minimum possible amount of resources, i.e., avoiding delivery of duplicate packets, without allowing any exchange of information among them. We derive what is the minimum amount of resources needed and propose a scheme based on random linear network coding that achieves asymptotically this bound without the need for the receivers to coordinate among them.
[ { "created": "Wed, 15 Jan 2014 16:53:09 GMT", "version": "v1" } ]
2014-01-16
[ [ "Munari", "Andrea", "" ], [ "Heindlmaier", "Michael", "" ], [ "Liva", "Gianluigi", "" ], [ "Berioli", "Matteo", "" ] ]
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1401.3666
Ulrich Jentschura
U. D. Jentschura
Light Sea Fermions in Electron-Proton and Muon-Proton Interactions
6 pages; RevTeX; published in Physical Review A in 2013; as compare to the journal version, we have added a note at the end of the paper which pertains to the (new) Ref. [42]; otherwise unchanged
Phys.Rev.A 88 (2013) 062514
10.1103/PhysRevA.88.062514
null
physics.atom-ph hep-ph nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The proton radius conundrum [R. Pohl et al., Nature vol.466, p.213 (2010) and A. Antognini et al., Science vol.339, p.417 (2013)] highlights the need to revisit any conceivable sources of electron-muon nonuniversality in lepton-proton interactions within the Standard Model. Superficially, a number of perturbative processes could appear to lead to such a nonunversality. One of these is a coupling of the scattered electron into an electronic as opposed to a muonic vacuum polarization loop in the photon exchange of two valence quarks, which is present only for electron projectiles as opposed to muon projectiles. However, we can show that this effect actually is part of the radiative correction to the proton's polarizability contribution to the Lamb shift, equivalent to a radiative correction to double scattering. We conclude that any conceivable genuine nonuniversality must be connected with a nonperturbative feature of the proton's structure, e.g., with the possible presence of light sea fermions as constituent components of the proton. If we assume an average of roughly 0.7*10^(-7) light sea positrons per valence quark, then we can show that virtual electron-positron annihiliation processes lead to an extra term in the electron-proton versus muon-proton interaction, which has the right sign and magnitude to explain the proton radius discrepancy.
[ { "created": "Wed, 15 Jan 2014 16:58:15 GMT", "version": "v1" }, { "created": "Thu, 16 Jan 2014 20:38:39 GMT", "version": "v2" } ]
2014-01-17
[ [ "Jentschura", "U. D.", "" ] ]
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1401.3667
Tongxin Li
Tongxin Li, Chun Lam Chan, Wenhao Huang, Tarik Kaced, and Sidharth Jaggi
Group Testing with Prior Statistics
23 pages, 12 figures, presented in ISIT 2014, Honolulu
Information Theory (ISIT), 2014 IEEE International Symposium on, 2346-2350
10.1109/ISIT.2014.6875253
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a new group testing model wherein each item is a binary random variable defined by an a priori probability of being defective. We assume that each probability is small and that items are independent, but not necessarily identically distributed. The goal of group testing algorithms is to identify with high probability the subset of defectives via non-linear (disjunctive) binary measurements. Our main contributions are two classes of algorithms: (1) adaptive algorithms with tests based either on a maximum entropy principle, or on a Shannon-Fano/Huffman code; (2) non-adaptive algorithms. Under loose assumptions and with high probability, our algorithms only need a number of measurements that is close to the information-theoretic lower bound, up to an explicitly-calculated universal constant factor. We provide simulations to support our results.
[ { "created": "Wed, 15 Jan 2014 17:00:31 GMT", "version": "v1" }, { "created": "Thu, 16 Jan 2014 15:11:44 GMT", "version": "v2" }, { "created": "Wed, 22 Jan 2014 17:48:06 GMT", "version": "v3" }, { "created": "Fri, 24 Jan 2014 08:53:54 GMT", "version": "v4" }, { "created": "Thu, 29 May 2014 14:21:56 GMT", "version": "v5" }, { "created": "Tue, 29 Jul 2014 21:43:51 GMT", "version": "v6" }, { "created": "Tue, 30 Sep 2014 17:42:04 GMT", "version": "v7" }, { "created": "Sat, 21 Jul 2018 06:40:38 GMT", "version": "v8" } ]
2018-07-24
[ [ "Li", "Tongxin", "" ], [ "Chan", "Chun Lam", "" ], [ "Huang", "Wenhao", "" ], [ "Kaced", "Tarik", "" ], [ "Jaggi", "Sidharth", "" ] ]
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1401.3669
Doina Tatar
D. Tatar, M.Lupea, E. Kapetanios
Hrebs and Cohesion Chains as similar tools for semantic text properties research
13 pages, KNOWLEDGE ENGINEERING: PRINCIPLES AND TECHNIQUES Proceedings of the International Conference on Knowledge Engineering, Principles and Techniques, KEPT 2013 Cluj-Napoca (Romania)
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cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this study it is proven that the Hrebs used in Denotation analysis of texts and Cohesion Chains (defined as a fusion between Lexical Chains and Coreference Chains) represent similar linguistic tools. This result gives us the possibility to extend to Cohesion Chains (CCs) some important indicators as, for example the Kernel of CCs, the topicality of a CC, text concentration, CC-diffuseness and mean diffuseness of the text. Let us mention that nowhere in the Lexical Chains or Coreference Chains literature these kinds of indicators are introduced and used since now. Similarly, some applications of CCs in the study of a text (as for example segmentation or summarization of a text) could be realized starting from hrebs. As an illustration of the similarity between Hrebs and CCs a detailed analyze of the poem "Lacul" by Mihai Eminescu is given.
[ { "created": "Wed, 15 Jan 2014 17:01:36 GMT", "version": "v1" } ]
2016-10-31
[ [ "Tatar", "D.", "" ], [ "Lupea", "M.", "" ], [ "Kapetanios", "E.", "" ] ]
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1401.3670
Katarzyna Paluch
Katarzyna Paluch
Better Approximation Algorithms for Maximum Asymmetric Traveling Salesman and Shortest Superstring
null
null
null
null
cs.DS cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the maximum asymmetric traveling salesman problem (Max ATSP) we are given a complete directed graph with nonnegative weights on the edges and we wish to compute a traveling salesman tour of maximum weight. In this paper we give a fast combinatorial $\frac 34$-approximation algorithm for Max ATSP. It is based on a novel use of {\it half-edges}, matchings and a new method of edge coloring. (A {\it half-edge} of edge $(u,v)$ is informally speaking "either a head or a tail of $(u,v)$".) The current best approximation algorithms for Max ATSP, achieving the approximation guarantee of $\frac 23$, are due to Kaplan, Lewenstein, Shafrir and Sviridenko and Elbassioni, Paluch, van Zuylen. Using a recent result by Mucha, which states that an $\alpha$-approximation algorithm for Max ATSP implies a $(2+\frac{11(1-\alpha)}{9-2\alpha})$-approximation algorithm for the shortest superstring problem (SSP), we obtain also a $(2 \frac{11}{30} \approx 2,3667)$-approximation algorithm for SSP, beating the previously best known (having approximation factor equal to $2 \frac{11}{23} \approx 2,4782$.)
[ { "created": "Wed, 15 Jan 2014 17:02:40 GMT", "version": "v1" } ]
2014-01-16
[ [ "Paluch", "Katarzyna", "" ] ]
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1401.3671
Maxim Shcherbakov
Anton T. Le, Maxim R. Shcherbakov, Natalia Dubrovina, Anatole Lupu, and Andrey A. Fedyanin
Plasmon ruler with gold nanorod dimers: utilizing the second-order resonance
4 pages, 5 figures
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null
null
physics.optics cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The idea of utilizing the second-order plasmon resonance of the gold nanorod {\pi}-dimers for plasmon rulers is introduced. We report on a qualitatively different dependence of the plasmon resonance shift on the interparticle distance for the first- and second-order longitudinal modes, extending the working range of plasmon rulers up to the distance values of 400 nm.
[ { "created": "Wed, 15 Jan 2014 17:02:55 GMT", "version": "v1" } ]
2014-01-16
[ [ "Le", "Anton T.", "" ], [ "Shcherbakov", "Maxim R.", "" ], [ "Dubrovina", "Natalia", "" ], [ "Lupu", "Anatole", "" ], [ "Fedyanin", "Andrey A.", "" ] ]
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1401.3674
Zhili Guo
Zhili Guo, Yao Wang, Elza Erkip, Shivendra Panwar
Wireless Video Multicast with Cooperative and Incremental Transmission of Parity Packets
11 pages in double-column IEEE journal style. Submitted to IEEE JOURNAL OF SELECTED TOPICS IN SIGNAL PROCESSING
null
10.1109/TMM.2015.2438718
null
cs.MM cs.IT cs.NI math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, a cooperative multicast scheme that uses Randomized Distributed Space Time Codes (R-DSTC), along with packet level Forward Error Correction (FEC), is studied. Instead of sending source packets and/or parity packets through two hops using R-DSTC as proposed in our prior work, the new scheme delivers both source packets and parity packets using only one hop. After the source station (access point, AP) first sends all the source packets, the AP as well as all nodes that have received all source packets together send the parity packets using R-DSTC. As more parity packets are transmitted, more nodes can recover all source packets and join the parity packet transmission. The process continues until all nodes acknowledge the receipt of enough packets for recovering the source packets. For each given node distribution, the optimum transmission rates for source and parity packets are determined such that the video rate that can be sustained at all nodes is maximized. This new scheme can support significantly higher video rates, and correspondingly higher PSNR of decoded video, than the prior approaches. Three suboptimal approaches, which do not require full information about user distribution or the feedback, and hence are more feasible in practice are also presented. The proposed suboptimal scheme with only the node count information and without feedback still outperforms our prior approach that assumes full channel information and no feedback.
[ { "created": "Wed, 15 Jan 2014 17:08:41 GMT", "version": "v1" } ]
2016-11-18
[ [ "Guo", "Zhili", "" ], [ "Wang", "Yao", "" ], [ "Erkip", "Elza", "" ], [ "Panwar", "Shivendra", "" ] ]
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1401.3675
Timo Mennle
Timo Mennle and Sven Seuken
Partial Strategyproofness: Relaxing Strategyproofness for the Random Assignment Problem
Working Paper
null
null
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present partial strategyproofness, a new, relaxed notion of strategyproofness for studying the incentive properties of non-strategyproof assignment mechanisms. Informally, a mechanism is partially strategyproof if it makes truthful reporting a dominant strategy for those agents whose preference intensities differ sufficiently between any two objects. We demonstrate that partial strategyproofness is axiomatically motivated and yields a parametric measure for "how strategyproof" an assignment mechanism is. We apply this new concept to derive novel insights about the incentive properties of the probabilistic serial mechanism and different variants of the Boston mechanism.
[ { "created": "Wed, 15 Jan 2014 17:08:44 GMT", "version": "v1" }, { "created": "Thu, 13 Feb 2014 17:41:13 GMT", "version": "v2" }, { "created": "Tue, 27 May 2014 17:30:08 GMT", "version": "v3" }, { "created": "Tue, 10 Jan 2017 17:11:06 GMT", "version": "v4" }, { "created": "Mon, 10 Jul 2017 16:23:37 GMT", "version": "v5" }, { "created": "Sun, 2 Aug 2020 11:41:42 GMT", "version": "v6" } ]
2020-08-04
[ [ "Mennle", "Timo", "" ], [ "Seuken", "Sven", "" ] ]
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1401.3677
Martin Haenggi
Na Deng, Wuyang Zhou, and Martin Haenggi
The Ginibre Point Process as a Model for Wireless Networks with Repulsion
29 pages, 11 figures
null
null
null
cs.IT cs.NI math.IT math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The spatial structure of transmitters in wireless networks plays a key role in evaluating the mutual interference and hence the performance. Although the Poisson point process (PPP) has been widely used to model the spatial configuration of wireless networks, it is not suitable for networks with repulsion. The Ginibre point process (GPP) is one of the main examples of determinantal point processes that can be used to model random phenomena where repulsion is observed. Considering the accuracy, tractability and practicability tradeoffs, we introduce and promote the $\beta$-GPP, an intermediate class between the PPP and the GPP, as a model for wireless networks when the nodes exhibit repulsion. To show that the model leads to analytically tractable results in several cases of interest, we derive the mean and variance of the interference using two different approaches: the Palm measure approach and the reduced second moment approach, and then provide approximations of the interference distribution by three known probability density functions. Besides, to show that the model is relevant for cellular systems, we derive the coverage probability of the typical user and also find that the fitted $\beta$-GPP can closely model the deployment of actual base stations in terms of the coverage probability and other statistics.
[ { "created": "Wed, 15 Jan 2014 17:13:03 GMT", "version": "v1" } ]
2014-01-16
[ [ "Deng", "Na", "" ], [ "Zhou", "Wuyang", "" ], [ "Haenggi", "Martin", "" ] ]
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1401.3678
Davide Ceresoli
Daniele Giofr\'e, Davide Ceresoli and Mario I. Trioni
Electronic transport in BN-substituted bilayer graphene nano-junctions
4 pages, 7 figures
Phys. Rev. B 93, 205420 (2016)
10.1103/PhysRevB.93.205420
null
cond-mat.mtrl-sci cond-mat.mes-hall physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigated a suspended bilayer graphene where the bottom (top) layer is doped by boron (nitrogen) substitutional atoms by using Density Functional Theory (DFT) calculations. We found that at high dopant concentration (one B-N pair every 32 C atoms) the electronic structure of the bilayer does not depend on the B-N distance but on the relative occupation of the bilayer graphene sub-lattices by B and N. We found that a large built in electric field is established between layers, giving rise to an energy gap. We further investigated the transport properties and found that intra-layer electron current is weakly influenced by the presence of these dopants while the inter-layer current is significantly enhanced for biases allowing the energy alignment of N and B states. This effect leads to current rectification in asymmetric junctions.
[ { "created": "Wed, 15 Jan 2014 17:16:46 GMT", "version": "v1" } ]
2016-05-25
[ [ "Giofré", "Daniele", "" ], [ "Ceresoli", "Davide", "" ], [ "Trioni", "Mario I.", "" ] ]
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1401.3682
Minglai Cai
Holger Boche, Minglai Cai, and Christian Deppe
Broadcast Classical-Quantum Capacity Region of Two-Phase Bidirectional Relaying Channel
null
Quantum Information Processing: Volume 14, Issue 10 (2015), Page 3879-3897
10.1007/s11128-015-1065-2
null
cs.IT math.IT math.QA quant-ph
http://creativecommons.org/licenses/by/4.0/
We study a three-node quantum network which enables bidirectional communication between two nodes with a half-duplex relay node. A decode-and-forward protocol is used to perform the communication in two phases. In the first phase, the messages of two nodes are transmitted to the relay node. In the second phase, the relay node broadcasts a re-encoded composition to the two nodes. We determine the capacity region of the broadcast phase.
[ { "created": "Wed, 15 Jan 2014 17:29:23 GMT", "version": "v1" }, { "created": "Tue, 21 Jan 2014 10:27:07 GMT", "version": "v2" }, { "created": "Mon, 27 Jul 2015 13:02:18 GMT", "version": "v3" }, { "created": "Mon, 28 Sep 2015 15:23:00 GMT", "version": "v4" } ]
2015-09-29
[ [ "Boche", "Holger", "" ], [ "Cai", "Minglai", "" ], [ "Deppe", "Christian", "" ] ]
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1401.3683
Vincenzo De Florio
Vincenzo De Florio and G. Deconinck
$\mathcal R\!\raise2pt\hbox{$\varepsilon$}\!\hbox{$\mathcal L$}$: A Fault Tolerance Linguistic Structure for Distributed Applications
Proc. of the 9th IEEE Conf. and Workshop on Engineering of Computer-Based Systems (ECBS-2002), Lund, Sweden, 8-11 April, 2002; pp. 51-58
null
null
null
cs.DC cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The embedding of fault tolerance provisions into the application layer of a programming language is a non-trivial task that has not found a satisfactory solution yet. Such a solution is very important, and the lack of a simple, coherent and effective structuring technique for fault tolerance has been termed by researchers in this field as the "software bottleneck of system development". The aim of this paper is to report on the current status of a novel fault tolerance linguistic structure for distributed applications characterized by soft real-time requirements. A compliant prototype architecture is also described. The key aspect of this structure is that it allows to decompose the target fault-tolerant application into three distinct components, respectively responsible for (1) the functional service, (2) the management of the fault tolerance provisions, and (3) the adaptation to the current environmental conditions. The paper also briefly mentions a few case studies and preliminary results obtained exercising the prototype.
[ { "created": "Wed, 15 Jan 2014 17:31:52 GMT", "version": "v1" } ]
2014-01-16
[ [ "De Florio", "Vincenzo", "" ], [ "Deconinck", "G.", "" ] ]
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1401.3685
Ragesh Jaiswal
Ragesh Jaiswal, Mehul Kumar, Pulkit Yadav
Improved analysis of D2-sampling based PTAS for k-means and other Clustering problems
arXiv admin note: substantial text overlap with arXiv:1201.4206
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cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We give an improved analysis of the simple $D^2$-sampling based PTAS for the $k$-means clustering problem given by Jaiswal, Kumar, and Sen (Algorithmica, 2013). The improvement on the running time is from $O\left(nd \cdot 2^{\tilde{O}(k^2/\epsilon)}\right)$ to $O\left(nd \cdot 2^{\tilde{O}(k/\epsilon)}\right)$.
[ { "created": "Wed, 15 Jan 2014 17:49:22 GMT", "version": "v1" } ]
2014-01-16
[ [ "Jaiswal", "Ragesh", "" ], [ "Kumar", "Mehul", "" ], [ "Yadav", "Pulkit", "" ] ]
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1401.3687
Kyle Burke
Kyle Burke
$2^3$ Quantified Boolean Formula Games and Their Complexities
14 pages, 0 figures, for Integers 2013 Conference proceedings
null
null
null
cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Consider QBF, the Quantified Boolean Formula problem, as a combinatorial game ruleset. The problem is rephrased as determining the winner of the game where two opposing players take turns assigning values to boolean variables. In this paper, three common variations of games are applied to create seven new games: whether each player is restricted to where they may play, which values they may set variables to, or the condition they are shooting for at the end of the game. The complexity for determining which player can win is analyzed for all games. Of the seven, two are trivially in P and the other five are PSPACE-complete. These varying properties are common for combinatorial games; reductions from these five hard games can simplify the process for showing the PSPACE-hardness of other games.
[ { "created": "Wed, 15 Jan 2014 17:55:42 GMT", "version": "v1" }, { "created": "Mon, 29 Dec 2014 23:25:09 GMT", "version": "v2" } ]
2014-12-31
[ [ "Burke", "Kyle", "" ] ]
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1401.3688
Roman Kompaneets
Roman Kompaneets, Alexei V. Ivlev, Vladimir Nosenko, Gregor E. Morfill
Wakes in inhomogeneous plasmas
null
null
10.1103/PhysRevE.89.043108
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Debye shielding of a charge immersed in a flowing plasma is an old classic problem in plasma physics. It has been given renewed attention in the last two decades in view of experiments with complex plasmas, where charged dust particles are often levitated in a region with strong ion flow. Efforts to describe the shielding of the dust particles in such conditions have been focused on the homogeneous plasma approximation, which ignores the substantial inhomogeneity of the levitation region. We address the role of the plasma inhomogeneity by rigorously calculating the point charge potential in the collisionless Bohm sheath. We demonstrate that the inhomogeneity can dramatically modify the wake, making it non-oscillatory and weaker.
[ { "created": "Wed, 15 Jan 2014 17:57:10 GMT", "version": "v1" } ]
2015-06-18
[ [ "Kompaneets", "Roman", "" ], [ "Ivlev", "Alexei V.", "" ], [ "Nosenko", "Vladimir", "" ], [ "Morfill", "Gregor E.", "" ] ]
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1401.3690
Christian Stump
Chris Berg and Viviane Pons and Travis Scrimshaw and Jessica Striker and Christian Stump
FindStat - the combinatorial statistics database
2 pages, project description
null
null
null
math.CO cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The FindStat project at www.FindStat.org provides an online platform for mathematicians, particularly for combinatorialists, to gather information about combinatorial statistics and their relations. This outline provides an overview over the project.
[ { "created": "Wed, 15 Jan 2014 18:04:36 GMT", "version": "v1" } ]
2014-01-16
[ [ "Berg", "Chris", "" ], [ "Pons", "Viviane", "" ], [ "Scrimshaw", "Travis", "" ], [ "Striker", "Jessica", "" ], [ "Stump", "Christian", "" ] ]
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1401.3700
Matanya Horowitz
Matanya B. Horowitz, Nikolai Matni, Joel W. Burdick
Convex Relaxations of SE(2) and SE(3) for Visual Pose Estimation
ICRA 2014 Preprint
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper proposes a new method for rigid body pose estimation based on spectrahedral representations of the tautological orbitopes of $SE(2)$ and $SE(3)$. The approach can use dense point cloud data from stereo vision or an RGB-D sensor (such as the Microsoft Kinect), as well as visual appearance data. The method is a convex relaxation of the classical pose estimation problem, and is based on explicit linear matrix inequality (LMI) representations for the convex hulls of $SE(2)$ and $SE(3)$. Given these representations, the relaxed pose estimation problem can be framed as a robust least squares problem with the optimization variable constrained to these convex sets. Although this formulation is a relaxation of the original problem, numerical experiments indicate that it is indeed exact - i.e. its solution is a member of $SE(2)$ or $SE(3)$ - in many interesting settings. We additionally show that this method is guaranteed to be exact for a large class of pose estimation problems.
[ { "created": "Wed, 15 Jan 2014 18:54:17 GMT", "version": "v1" }, { "created": "Sun, 6 Apr 2014 17:57:31 GMT", "version": "v2" } ]
2014-04-08
[ [ "Horowitz", "Matanya B.", "" ], [ "Matni", "Nikolai", "" ], [ "Burdick", "Joel W.", "" ] ]
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1401.3709
Antonino Di Piazza
Norman Neitz, Naveen Kumar, Felix Mackenroth, Karen Z. Hatsagortsyan, Christoph H. Keitel, and Antonino Di Piazza
Novel aspects of radiation reaction in the classical and the quantum regime
13 pages, 3 figures, Proceedings of the LPHYS'13 Workshop
null
10.1088/1742-6596/497/1/012015
null
hep-ph physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This work is dedicated to the study of radiation reaction signatures in the framework of classical and quantum electrodynamics. Since there has been no distinct experimental validation of radiation reaction and its underlying equations so far and its impact is expected to be substantial for the construction of new experimental devices, e.g., quantum x-free electron lasers, a profound understanding of radiation reaction effects is of special interest. Here, we describe how the inclusion of quantum radiation reaction effects changes the dynamics of ultra-relativistic electron beams colliding with intense laser pulses significantly. Thereafter, the angular distribution of emitted radiation is demonstrated to be strongly altered in the quantum framework, if in addition to single photon emission also higher order photon emissions are considered. Furthermore, stimulated Raman scattering of an ultra-intense laser pulse in plasmas is examined and forward Raman scattering is found to be significantly increased by the inclusion of radiation reaction effects in the classical regime. The numerical simulations in this work show the feasibility of an experimental verification of the predicted effects with presently available lasers and electron accelerators.
[ { "created": "Mon, 13 Jan 2014 15:29:01 GMT", "version": "v1" } ]
2015-06-18
[ [ "Neitz", "Norman", "" ], [ "Kumar", "Naveen", "" ], [ "Mackenroth", "Felix", "" ], [ "Hatsagortsyan", "Karen Z.", "" ], [ "Keitel", "Christoph H.", "" ], [ "Di Piazza", "Antonino", "" ] ]
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1401.3714
Rafael Mendes de Oliveira
Zeev Dvir, Rafael Oliveira, Amir Shpilka
Testing Equivalence of Polynomials under Shifts
null
null
null
null
cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Two polynomials $f, g \in \mathbb{F}[x_1, \ldots, x_n]$ are called shift-equivalent if there exists a vector $(a_1, \ldots, a_n) \in \mathbb{F}^n$ such that the polynomial identity $f(x_1+a_1, \ldots, x_n+a_n) \equiv g(x_1,\ldots,x_n)$ holds. Our main result is a new randomized algorithm that tests whether two given polynomials are shift equivalent. Our algorithm runs in time polynomial in the circuit size of the polynomials, to which it is given black box access. This complements a previous work of Grigoriev (Theoretical Computer Science, 1997) who gave a deterministic algorithm running in time $n^{O(d)}$ for degree $d$ polynomials. Our algorithm uses randomness only to solve instances of the Polynomial Identity Testing (PIT) problem. Hence, if one could de-randomize PIT (a long-standing open problem in complexity) a de-randomization of our algorithm would follow. This establishes an equivalence between de-randomizing shift-equivalence testing and de-randomizing PIT (both in the black-box and the white-box setting). For certain restricted models, such as Read Once Branching Programs, we already obtain a deterministic algorithm using existing PIT results.
[ { "created": "Wed, 15 Jan 2014 19:29:48 GMT", "version": "v1" }, { "created": "Wed, 19 Feb 2014 05:03:55 GMT", "version": "v2" } ]
2014-02-20
[ [ "Dvir", "Zeev", "" ], [ "Oliveira", "Rafael", "" ], [ "Shpilka", "Amir", "" ] ]
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1401.3717
Igor Vladimirov
Igor G. Vladimirov and Ian R. Petersen
Physical Realizability and Mean Square Performance of Translation Invariant Networks of Interacting Linear Quantum Stochastic Systems
18 pages, 7 figures, submitted to MTNS 2014 on 29 November 2013
null
null
null
cs.SY math.PR quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper is concerned with translation invariant networks of linear quantum stochastic systems with nearest neighbour interaction mediated by boson fields. The systems are associated with sites of a one-dimensional chain or a multidimensional lattice and are governed by coupled linear quantum stochastic differential equations (QSDEs). Such interconnections of open quantum systems are relevant, for example, to the phonon theory of crystalline solids, atom trapping in optical lattices and quantum metamaterials. In order to represent a large-scale open quantum harmonic oscillator, the coefficients of the coupled QSDEs must satisfy certain physical realizability conditions. These are established in the form of matrix algebraic equations for the parameters of an individual building block of the network and its interaction with the neighbours and external fields. We also discuss the computation of mean square performance functionals with block Toeplitz weighting matrices for such systems in the thermodynamic limit per site for unboundedly increasing fragments of the lattice.
[ { "created": "Wed, 15 Jan 2014 19:42:19 GMT", "version": "v1" } ]
2014-01-16
[ [ "Vladimirov", "Igor G.", "" ], [ "Petersen", "Ian R.", "" ] ]
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1401.3718
Seung Ki Baek
Seung Ki Baek and Beom Jun Kim
Surname statistics - Crossing the boundary between disciplines
3 pages
Physics of Life Reviews, 10, 420 (2013)
10.1016/j.plrev.2013.07.029
null
physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Regarding "Surname distribution in population genetics and in statistical physics" by Rossi, we add comments on the following two points: One is a difference in his renormalization-group formulation from the traditional one in statistical physics despite apparent similarity. The other is the potential importance of the entropy maximization principle under constraints governing the evolution of surname statistics.
[ { "created": "Sat, 11 Jan 2014 03:35:20 GMT", "version": "v1" } ]
2014-01-16
[ [ "Baek", "Seung Ki", "" ], [ "Kim", "Beom Jun", "" ] ]
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1401.3720
Vahagn Gharibyan
Vahagn Gharibyan
Accelerator experiments check general relativity
A note is added about the applied approximation of high energy, gravitationally sterile electrons
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DESY 14-003
physics.gen-ph gr-qc hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The deflection of gamma-rays in Earth's gravitational field is tested in laser Compton scattering at high energy accelerators. Within a formalism connecting the bending angle to the photon's momentum it follows that detected gamma-ray spectra are inconsistent with a deflection magnitude of 2.78 nrad, predicted by Einstein's gravity theory. Moreover, preliminary results for 13-28 GeV photons from two different laboratories show opposite - away from the beam line - deflection, amounting to 33.8-0.8 prad. These conclusions, however, are applicable only for gravitationally sterile high energy electrons. Much more subtle effects are expected if the gravitational deflection of the electrons is taken into account.
[ { "created": "Mon, 13 Jan 2014 23:32:08 GMT", "version": "v1" }, { "created": "Sat, 12 Jul 2014 07:57:40 GMT", "version": "v2" }, { "created": "Tue, 28 Jun 2022 18:02:27 GMT", "version": "v3" } ]
2022-06-30
[ [ "Gharibyan", "Vahagn", "" ] ]
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1401.3733
Ed Bennett
Ed Bennett, Luigi Del Debbio, Kirk Jordan, Biagio Lucini, Agostino Patella, Claudio Pica, Antonio Rago
BSMBench: a flexible and scalable supercomputer benchmark from computational particle physics
6 pages, 5 figures; version as presented at High Performance Computing and Simulation, HPCS 2016
2016 International Conference on High Performance Computing & Simulation (HPCS), Innsbruck, Austria, 2016, pp. 834-839
10.1109/HPCSim.2016.7568421
CP3-Origins-2014-001 DNRF90 & DIAS-2014-1
cs.DC hep-lat
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Lattice Quantum ChromoDynamics (QCD), and by extension its parent field, Lattice Gauge Theory (LGT), make up a significant fraction of supercomputing cycles worldwide. As such, it would be irresponsible not to evaluate machines' suitability for such applications. To this end, a benchmark has been developed to assess the performance of LGT applications on modern HPC platforms. Distinct from previous QCD-based benchmarks, this allows probing the behaviour of a variety of theories, which allows varying the ratio of demands between on-node computations and inter-node communications. The results of testing this benchmark on various recent HPC platforms are presented, and directions for future development are discussed.
[ { "created": "Wed, 15 Jan 2014 20:33:38 GMT", "version": "v1" }, { "created": "Thu, 22 Sep 2016 12:27:22 GMT", "version": "v2" } ]
2016-09-23
[ [ "Bennett", "Ed", "" ], [ "Del Debbio", "Luigi", "" ], [ "Jordan", "Kirk", "" ], [ "Lucini", "Biagio", "" ], [ "Patella", "Agostino", "" ], [ "Pica", "Claudio", "" ], [ "Rago", "Antonio", "" ] ]
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1401.3734
Heinrich P\"as
Torsten Heinrich, Benjamin Knopp and Heinrich P\"as
Entropy, biological evolution and the psychological arrow of time
12 pages, 5 figures. Version accepted for publication in Journal of Modern Physics
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null
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physics.gen-ph astro-ph.CO q-bio.OT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We argue that in Universes where future and past differ only by the entropy content a psychological arrow of time pointing in the direction of entropy increase can arise from natural selection in biological evolution. We show that this effect can be demonstrated in very simple toy computer simulations of evolution in an entropy increasing or decreasing environment.
[ { "created": "Mon, 13 Jan 2014 22:18:58 GMT", "version": "v1" }, { "created": "Mon, 30 Nov 2015 16:34:53 GMT", "version": "v2" } ]
2015-12-01
[ [ "Heinrich", "Torsten", "" ], [ "Knopp", "Benjamin", "" ], [ "Päs", "Heinrich", "" ] ]
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1401.3737
Tobias Glasmachers
Tobias Glasmachers and \"Ur\"un Dogan
Coordinate Descent with Online Adaptation of Coordinate Frequencies
null
null
null
null
stat.ML cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Coordinate descent (CD) algorithms have become the method of choice for solving a number of optimization problems in machine learning. They are particularly popular for training linear models, including linear support vector machine classification, LASSO regression, and logistic regression. We consider general CD with non-uniform selection of coordinates. Instead of fixing selection frequencies beforehand we propose an online adaptation mechanism for this important parameter, called the adaptive coordinate frequencies (ACF) method. This mechanism removes the need to estimate optimal coordinate frequencies beforehand, and it automatically reacts to changing requirements during an optimization run. We demonstrate the usefulness of our ACF-CD approach for a variety of optimization problems arising in machine learning contexts. Our algorithm offers significant speed-ups over state-of-the-art training methods.
[ { "created": "Wed, 15 Jan 2014 20:50:00 GMT", "version": "v1" } ]
2014-01-16
[ [ "Glasmachers", "Tobias", "" ], [ "Dogan", "Ürün", "" ] ]
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1401.3758
Luk\'a\v{s} Vok\v{r}\'inek
Luk\'a\v{s} Vok\v{r}\'inek
Decidability of the extension problem for maps into odd-dimensional spheres
6 pages
null
null
null
math.AT cs.CG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In a recent paper, it was shown that the problem of existence of a continuous map $X \to Y$ extending a given map $A \to Y$ defined on a subspace $A \subseteq X$ is undecidable, even for $Y$ an even-dimensional sphere. In the present paper, we prove that the same problem for $Y$ an odd-dimensional sphere is decidable. More generally, the same holds for any $d$-connected target space $Y$ whose homotopy groups $\pi_k Y$ are finite for $k>2d$.
[ { "created": "Wed, 15 Jan 2014 21:11:58 GMT", "version": "v1" } ]
2014-01-17
[ [ "Vokřínek", "Lukáš", "" ] ]
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1401.3760
Xiao Yang
Xiao Yang and Andrew R. Barron
Large Alphabet Compression and Predictive Distributions through Poissonization and Tilting
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null
null
null
cs.IT math.IT stat.ME
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper introduces a convenient strategy for coding and predicting sequences of independent, identically distributed random variables generated from a large alphabet of size $m$. In particular, the size of the sample is allowed to be variable. The employment of a Poisson model and tilting method simplifies the implementation and analysis through independence. The resulting strategy is optimal within the class of distributions satisfying a moment condition, and is close to optimal for the class of all i.i.d distributions on strings of a given length. Moreover, the method can be used to code and predict strings with a condition on the tail of the ordered counts. It can also be applied to distributions in an envelope class.
[ { "created": "Wed, 15 Jan 2014 21:18:56 GMT", "version": "v1" } ]
2014-01-17
[ [ "Yang", "Xiao", "" ], [ "Barron", "Andrew R.", "" ] ]
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1401.3762
Andrew Ju
Andrew Ju, Patrick Healy
An Experimental Evaluation of List Coloring Algorithms
null
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The list coloring problem is a variant of vertex coloring where a vertex may be colored only a color from a prescribed set. Several applications of vertex coloring are more appropriately modelled as instances of list coloring and thus we argue that it is an important problem to consider. Regardless of the importance of list coloring, few published algorithms exist for it. In this paper we review the only two existing ones we could find and propose an exact branch and bound one. We conduct an experimental evaluation of the three algorithms.
[ { "created": "Wed, 15 Jan 2014 21:22:18 GMT", "version": "v1" }, { "created": "Fri, 20 Jun 2014 23:07:41 GMT", "version": "v2" } ]
2014-06-24
[ [ "Ju", "Andrew", "" ], [ "Healy", "Patrick", "" ] ]
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1401.3766
Ugo Dal Lago
Raphaelle Crubille, Ugo Dal Lago
On Probabilistic Applicative Bisimulation and Call-by-Value $\lambda$-Calculi (Long Version)
30 pages
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Probabilistic applicative bisimulation is a recently introduced coinductive methodology for program equivalence in a probabilistic, higher-order, setting. In this paper, the technique is applied to a typed, call-by-value, lambda-calculus. Surprisingly, the obtained relation coincides with context equivalence, contrary to what happens when call-by-name evaluation is considered. Even more surprisingly, full-abstraction only holds in a symmetric setting.
[ { "created": "Wed, 15 Jan 2014 21:43:39 GMT", "version": "v1" }, { "created": "Wed, 29 Jan 2014 08:50:34 GMT", "version": "v2" } ]
2014-01-30
[ [ "Crubille", "Raphaelle", "" ], [ "Lago", "Ugo Dal", "" ] ]
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1401.3768
Wei Jiang
Bharath K. Samanthula, Wei Jiang, Elisa Bertino
Lightweight and Secure Two-Party Range Queries over Outsourced Encrypted Databases
25 pages, 1 figure
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
With the many benefits of cloud computing, an entity may want to outsource its data and their related analytics tasks to a cloud. When data are sensitive, it is in the interest of the entity to outsource encrypted data to the cloud; however, this limits the types of operations that can be performed on the cloud side. Especially, evaluating queries over the encrypted data stored on the cloud without the entity performing any computation and without ever decrypting the data become a very challenging problem. In this paper, we propose solutions to conduct range queries over outsourced encrypted data. The existing methods leak valuable information to the cloud which can violate the security guarantee of the underlying encryption schemes. In general, the main security primitive used to evaluate range queries is secure comparison (SC) of encrypted integers. However, we observe that the existing SC protocols are not very efficient. To this end, we first propose a novel SC scheme that takes encrypted integers and outputs encrypted comparison result. We empirically show its practical advantage over the current state-of-the-art. We then utilize the proposed SC scheme to construct two new secure range query protocols. Our protocols protect data confidentiality, privacy of user's query, and also preserve the semantic security of the encrypted data; therefore, they are more secure than the existing protocols. Furthermore, our second protocol is lightweight at the user end, and it can allow an authorized user to use any device with limited storage and computing capability to perform the range queries over outsourced encrypted data.
[ { "created": "Wed, 15 Jan 2014 21:50:01 GMT", "version": "v1" } ]
2014-01-17
[ [ "Samanthula", "Bharath K.", "" ], [ "Jiang", "Wei", "" ], [ "Bertino", "Elisa", "" ] ]
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1401.3770
Dvira Segal
Amro Dodin, Savannah Garmon, Lena Simine, Dvira Segal
Landau-Zener transitions mediated by an environment: population transfer and energy dissipation
null
J. Chem. Phys. 140, 124709 (2014)
10.1063/1.4869519
null
cond-mat.mes-hall physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study Landau-Zener transitions between two states with the addition of a shared discretized continuum. The continuum allows for population decay from the initial state as well as indirect transitions between the two states. The probability of nonadiabatic transition in this multichannel model preserves the standard Landau-Zener functional form except for a shift in the usual exponential factor, reflecting population transfer into the continuum. We provide an intuitive explanation for this behavior assuming independent individual transitions between pairs of states. In contrast, the probability of survival in the ground state at long time shows a novel, non-monotonic, functional form, with an oscillatory behavior in the sweep rate at low sweep rate values. We contrast the behavior of this open-multistate model to other generalized Landau-Zener models incorporating an environment: the stochastic Landau-Zener model and the dissipative case, where energy dissipation and thermal excitations affect the adiabatic region. Finally, we present evidence that the continuum of states may act to shield the two-state Landau-Zener transition probability from the effect of noise.
[ { "created": "Wed, 15 Jan 2014 21:55:47 GMT", "version": "v1" } ]
2014-07-23
[ [ "Dodin", "Amro", "" ], [ "Garmon", "Savannah", "" ], [ "Simine", "Lena", "" ], [ "Segal", "Dvira", "" ] ]
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1401.3781
Wataru Kumagai
Wataru Kumagai, Masahito Hayashi
Random Number Conversion and LOCC Conversion via Restricted Storage
53 pages
null
null
null
quant-ph cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider random number conversion (RNC) through random number storage with restricted size. We clarify the relation between the performance of RNC and the size of storage in the framework of first- and second- order asymptotics, and derive their rate regions. Then, we show that the results for RNC with restricted storage recover those for conventional RNC without storage in the limit of storage size. To treat RNC via restricted storage, we introduce a new kind of probability distributions named generalized Rayleigh-normal distributions. Using the generalized Rayleigh-normal distributions, we can describe the second-order asymptotic behaviour of RNC via restricted storage in a unified manner. As an application to quantum information theory, we analyze LOCC conversion via entanglement storage with restricted size. Moreover, we derive the optimal LOCC compression rate under a constraint of conversion accuracy.
[ { "created": "Wed, 15 Jan 2014 22:48:22 GMT", "version": "v1" }, { "created": "Sun, 19 Jan 2014 21:05:46 GMT", "version": "v2" }, { "created": "Mon, 6 Oct 2014 10:01:53 GMT", "version": "v3" }, { "created": "Tue, 21 Nov 2017 09:26:53 GMT", "version": "v4" } ]
2017-11-22
[ [ "Kumagai", "Wataru", "" ], [ "Hayashi", "Masahito", "" ] ]
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1401.3785
Rodrigo de Lamare
Songcen Xu, Rodrigo C. de Lamare and H. Vincent Poor
Adaptive Link Selection Strategies for Distributed Estimation in Wireless Sensor Networks
4 figures, 1 table
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work, we propose adaptive link selection strategies for distributed estimation in diffusion-type wireless networks. We develop an exhaustive search-based link selection algorithm and a sparsity-inspired link selection algorithm that can exploit the topology of networks with poor-quality links. In the exhaustive search-based algorithm, we choose the set of neighbors that results in the smallest excess mean square error (EMSE) for a specific node. In the sparsity-inspired link selection algorithm, a convex regularization is introduced to devise a sparsity-inspired link selection algorithm. The proposed algorithms have the ability to equip diffusion-type wireless networks and to significantly improve their performance. Simulation results illustrate that the proposed algorithms have lower EMSE values, a better convergence rate and significantly improve the network performance when compared with existing methods.
[ { "created": "Wed, 15 Jan 2014 23:21:16 GMT", "version": "v1" } ]
2014-01-17
[ [ "Xu", "Songcen", "" ], [ "de Lamare", "Rodrigo C.", "" ], [ "Poor", "H. Vincent", "" ] ]
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1401.3788
Ofer Firstenberg
Itay Katzir, Amiram Ron, Ofer Firstenberg
Diffraction manipulation by four-wave mixing
null
null
10.1364/OE.23.006379
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We suggest a scheme to manipulate paraxial diffraction by utilizing the dependency of a four-wave mixing process on the relative angle between the light fields. A microscopic model for four-wave mixing in a Lambda-type level structure is introduced and compared to recent experimental data. We show that images with feature size as low as 10 micrometers can propagate with very little or even negative diffraction. The mechanism is completely different from that conserving the shape of spatial solitons in nonlinear media, as here diffraction is suppressed for arbitrary spatial profiles. At the same time, the gain inherent to the nonlinear process prevents loss and allows for operating at high optical depths. Our scheme does not rely on atomic motion and is thus applicable to both gaseous and solid media.
[ { "created": "Wed, 15 Jan 2014 23:24:10 GMT", "version": "v1" }, { "created": "Fri, 28 Nov 2014 21:26:58 GMT", "version": "v2" } ]
2015-06-18
[ [ "Katzir", "Itay", "" ], [ "Ron", "Amiram", "" ], [ "Firstenberg", "Ofer", "" ] ]
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1401.3792
Ross McKenzie
Ross H. McKenzie, Christiaan Bekker, Bijyalaxmi Athokpam, and Sai G. Ramesh
Effect of quantum nuclear motion on hydrogen bonding
12 pages, 8 figures. Notation clarified. Revised figure including the effect of bending vibrations on secondary geometric isotope effect. Final version, accepted for publication in Journal of Chemical Physics
J. Chem. Phys. 140, 174508 (2014)
10.1063/1.4873352
null
physics.chem-ph cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This work considers how the properties of hydrogen bonded complexes, D-H....A, are modified by the quantum motion of the shared proton. Using a simple two-diabatic state model Hamiltonian, the analysis of the symmetric case, where the donor (D) and acceptor (A) have the same proton affinity, is carried out. For quantitative comparisons, a parametrization specific to the O-H....O complexes is used. The vibrational energy levels of the one-dimensional ground state adiabatic potential of the model are used to make quantitative comparisons with a vast body of condensed phase data, spanning a donor-acceptor separation (R) range of about 2.4-3.0 A, i.e., from strong to weak bonds. The position of the proton and its longitudinal vibrational frequency, along with the isotope effects in both are discussed. An analysis of the secondary geometric isotope effects, using a simple extension of the two-state model, yields an improved agreement of the predicted variation with R of frequency isotope effects. The role of the bending modes in also considered: their quantum effects compete with those of the stretching mode for certain ranges of H-bond strengths. In spite of the economy in the parametrization of the model used, it offers key insights into the defining features of H-bonds, and semi-quantitatively captures several experimental trends.
[ { "created": "Wed, 15 Jan 2014 23:43:21 GMT", "version": "v1" }, { "created": "Tue, 4 Feb 2014 01:08:36 GMT", "version": "v2" }, { "created": "Tue, 22 Apr 2014 03:31:51 GMT", "version": "v3" } ]
2014-05-09
[ [ "McKenzie", "Ross H.", "" ], [ "Bekker", "Christiaan", "" ], [ "Athokpam", "Bijyalaxmi", "" ], [ "Ramesh", "Sai G.", "" ] ]
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1401.3794
Thibaut Vidal
Thibaut Vidal, Nelson Maculan, Puca Huachi Vaz Penna, Luis Satoru Ochi
Large neighborhoods with implicit customer selection for vehicle routing problems with profits
Working Paper -- MIT, Revised, 34 pages
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cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider several Vehicle Routing Problems (VRP) with profits, which seek to select a subset of customers, each one being associated with a profit, and to design service itineraries. When the sum of profits is maximized under distance constraints, the problem is usually called team orienteering problem. The capacitated profitable tour problem seeks to maximize profits minus travel costs under capacity constraints. Finally, in the VRP with private fleet and common carrier, some customers can be delegated to an external carrier subject to a cost. Three families of combined decisions must be taken: customers selection, assignment to vehicles, and sequencing of deliveries for each route. We propose a new neighborhood search for these problems which explores an exponential number of solutions in pseudo polynomial time. The search is conducted with standard VRP neighborhoods on an "exhaustive" solution representation, visiting all customers. Since visiting all customers is usually infeasible or sub-optimal, an efficient "Select" algorithm, based on resource constrained shortest paths, is repeatedly used on any new route to find the optimal subsequence of visits to customers. The good performance of these neighborhood structures is demonstrated by extensive computational experiments with a local search, an iterated local search and a hybrid genetic algorithm. Intriguingly, even a local-improvement method to the first local optimum of this neighborhood achieves an average gap of 0.09% on classic team orienteering benchmark instances, rivaling with the current state-of-the-art metaheuristics. Promising research avenues on hybridizations with more standard routing neighborhoods are also open.
[ { "created": "Wed, 15 Jan 2014 23:47:21 GMT", "version": "v1" }, { "created": "Sat, 26 Jul 2014 22:03:37 GMT", "version": "v2" } ]
2014-07-29
[ [ "Vidal", "Thibaut", "" ], [ "Maculan", "Nelson", "" ], [ "Penna", "Puca Huachi Vaz", "" ], [ "Ochi", "Luis Satoru", "" ] ]
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1401.3798
Imran Mohamed
Imran Mohamed, Giampaolo Pisano, Ming Wah Ng, Vic Haynes, and Bruno Maffei
Dog Bone Triplet Metamaterial Wave Plate
5 pages, 5 figures. Conference paper. Progress In Electromagnetics Research Symposium 2012 Kuala Lumpur, Malaysia, 27th-30th March 2012. The published version can be found via either http://piers.org/piersproceedings/piers2012KualalumpurProc.php?searchname=Dog+Bone+Triplet+Metamaterial+Wave+Plate or https://www.escholar.manchester.ac.uk/uk-ac-man-scw:187815
PIERS 2012 Kuala Lumpur Proceedings, 1756-1760. Kuala Lumpur, Malaysia 27th-30th March 2012
null
uk-ac-man-scw:187815
astro-ph.IM physics.ins-det physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Metamaterials are artificially made sub-wavelength structures arranged in periodic arrays. They can be designed to interact with electromagnetic radiation in many different and interesting ways such as allowing radiation to experience a negative refractive index (NRI). We have used this technique to design and build a quasi-optical Half Wave Plate (HWP) that exhibits a large birefringence by virtue of having a positive refractive index in one axis and a NRI in the other. Previous implementations of such NRI-HWP have been narrow band ($\sim$1-3%) due to the inherent reliance on needing a resonance to create the NRI region. We manufacture a W-band prototype of a novel HWP that uses the Pancharatnam method to extend the bandwidth (up to more than twice) of a usual NRI-HWP. Our simulated and experimentally obtained results despite their differences show that a broadening of a flat region of the phase difference is possible even with the initially steep gradient for a single plate.
[ { "created": "Thu, 16 Jan 2014 00:06:34 GMT", "version": "v1" } ]
2015-01-07
[ [ "Mohamed", "Imran", "" ], [ "Pisano", "Giampaolo", "" ], [ "Ng", "Ming Wah", "" ], [ "Haynes", "Vic", "" ], [ "Maffei", "Bruno", "" ] ]
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1401.3800
Vladislav A. Yastrebov Dr.
Vladislav A. Yastrebov, Guillaume Anciaux, Jean-Fran\c{c}ois Molinari
From infinitesimal to full contact between rough surfaces: evolution of the contact area
47 pages, 17 figures, 72 references
International Journal of Solids and Structures, 52:83-102 (2015)
10.1016/j.ijsolstr.2014.09.019
null
physics.class-ph cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We carry out a statistically meaningful study on self-affine rough surfaces in elastic frictionless non-adhesive contact. We study the evolution of the true contact area under increasing squeezing pressure. Rough surfaces are squeezed from zero up to full contact, which enables us to compare the numerical results both with asperity based models at light pressures and with Persson's contact model for the entire range of pressures. Through the contact perimeter we estimate the error bounds inherent to contact area calculation in discrete problems. A large number of roughness realizations enables us to compute reliably the derivative of the contact area with respect to the pressure. In contrast to Persson's model and in agreement with asperity based models, we demonstrate that at light pressures it is a decreasing convex function. The nonlinearity of the contact area evolution, preserved for the entire range of pressures, is especially strong close to infinitesimal contact. This fact makes difficult an accurate investigation of contact at light pressure and prevents the evaluation of the proportionality coefficient, which is predicted by analytical models. A good agreement of numerical results with Persson's model is obtained for the shape of the area-pressure curve especially near full contact. We investigate the effects of the cutoff wavenumbers in surface spectrum onto the contact area evolution. Nayak's parameter is one of the central characteristics of roughness, it also plays an important role in rough contact mechanics, but its effect is significantly weaker than predicted by asperity based models. We give a detailed derivation of a new phenomenological contact evolution law; also we derive formulae that link Nayak's parameter and density of asperities with Hurst exponent and cutoffs wavenumbers.
[ { "created": "Thu, 16 Jan 2014 00:10:00 GMT", "version": "v1" } ]
2017-01-10
[ [ "Yastrebov", "Vladislav A.", "" ], [ "Anciaux", "Guillaume", "" ], [ "Molinari", "Jean-François", "" ] ]
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1401.3801
Masahito Hayashi
Shun Watanabe, Masahito Hayashi
Finite-length Analysis on Tail probability for Markov Chain and Application to Simple Hypothesis Testing
null
null
null
null
math.ST cs.IT math.IT math.PR stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using terminologies of information geometry, we derive upper and lower bounds of the tail probability of the sample mean. Employing these bounds, we obtain upper and lower bounds of the minimum error probability of the 2nd kind of error under the exponential constraint for the error probability of the 1st kind of error in a simple hypothesis testing for a finite-length Markov chain, which yields the Hoeffding type bound. For these derivations, we derive upper and lower bounds of cumulant generating function for Markov chain. As a byproduct, we obtain another simple proof of central limit theorem for Markov chain.
[ { "created": "Thu, 16 Jan 2014 00:16:10 GMT", "version": "v1" }, { "created": "Sun, 15 Mar 2015 01:29:58 GMT", "version": "v2" } ]
2015-03-17
[ [ "Watanabe", "Shun", "" ], [ "Hayashi", "Masahito", "" ] ]
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1401.3807
Son Hoang Dau
Son Hoang Dau and Wentu Song and Chau Yuen
On the Existence of MDS Codes Over Small Fields With Constrained Generator Matrices
8 pages
null
null
null
cs.IT cs.DM math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the existence over small fields of Maximum Distance Separable (MDS) codes with generator matrices having specified supports (i.e. having specified locations of zero entries). This problem unifies and simplifies the problems posed in recent works of Yan and Sprintson (NetCod'13) on weakly secure cooperative data exchange, of Halbawi et al. (arxiv'13) on distributed Reed-Solomon codes for simple multiple access networks, and of Dau et al. (ISIT'13) on MDS codes with balanced and sparse generator matrices. We conjecture that there exist such $[n,k]_q$ MDS codes as long as $q \geq n + k - 1$, if the specified supports of the generator matrices satisfy the so-called MDS condition, which can be verified in polynomial time. We propose a combinatorial approach to tackle the conjecture, and prove that the conjecture holds for a special case when the sets of zero coordinates of rows of the generator matrix share with each other (pairwise) at most one common element. Based on our numerical result, the conjecture is also verified for all $k \leq 7$. Our approach is based on a novel generalization of the well-known Hall's marriage theorem, which allows (overlapping) multiple representatives instead of a single representative for each subset.
[ { "created": "Thu, 16 Jan 2014 01:24:33 GMT", "version": "v1" } ]
2014-01-17
[ [ "Dau", "Son Hoang", "" ], [ "Song", "Wentu", "" ], [ "Yuen", "Chau", "" ] ]
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1401.3809
Shigeaki Kuzuoka
Shigeaki Kuzuoka and Shun Watanabe
An Information-Spectrum Approach to Weak Variable-Length Source Coding with Side-Information
54 pages, 2 figure
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper studies variable-length (VL) source coding of general sources with side-information. Novel one-shot coding theorems for coding with common side-information available at the encoder and the decoder and Slepian- Wolf (SW) coding (i.e., with side-information only at the decoder) are given, and then, are applied to asymptotic analyses of these coding problems. Especially, a general formula for the infimum of the coding rate asymptotically achievable by weak VL-SW coding (i.e., VL-SW coding with vanishing error probability) is derived. Further, the general formula is applied to investigating weak VL-SW coding of mixed sources. Our results derive and extend several known results on SW coding and weak VL coding, e.g., the optimal achievable rate of VL-SW coding for mixture of i.i.d. sources is given for countably infinite alphabet case with mild condition. In addition, the usefulness of the encoder side-information is investigated. Our result shows that if the encoder side-information is useless in weak VL coding then it is also useless even in the case where the error probability may be positive asymptotically.
[ { "created": "Thu, 16 Jan 2014 01:52:04 GMT", "version": "v1" }, { "created": "Tue, 8 Apr 2014 00:55:26 GMT", "version": "v2" } ]
2014-04-09
[ [ "Kuzuoka", "Shigeaki", "" ], [ "Watanabe", "Shun", "" ] ]
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1401.3810
Lianlin Li Dr
Lianlin Li, Fang Li, Tie Jun Cui
Subwavelength imaging of sparse broadband sources surrounded by an open disordered medium from a single antenna
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null
10.1109/LAWP.2014.2341231
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this letter we study the subwavelength imaging of sparse broadband sources inside a disordered medium by processing the data acquired by a single antenna. A mathematical model has been developed for solving such problem based on the idea of sparse reconstruction. We show that the strongly disordered medium can serves as an efficient apparatus for compressive measurement, which shifts the complexity of devising compressive sensing (CS) hardware from the design, fabrication and electronic control. The proposed method and associated results can find applications in several imaging disciplines, such as optics, THz, RF or ultrasound imaging.
[ { "created": "Thu, 16 Jan 2014 02:04:25 GMT", "version": "v1" } ]
2015-06-18
[ [ "Li", "Lianlin", "" ], [ "Li", "Fang", "" ], [ "Cui", "Tie Jun", "" ] ]
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1401.3814
Masahito Hayashi
Masahito Hayashi, Shun Watanabe
Information Geometry Approach to Parameter Estimation in Markov Chains
Appendix D is added
Annals of Statistics, Volume 44, Number 4, 1495-1535 (2016)
10.1214/15-AOS1420
null
math.ST cs.IT math.IT stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the parameter estimation of Markov chain when the unknown transition matrix belongs to an exponential family of transition matrices. Then, we show that the sample mean of the generator of the exponential family is an asymptotically efficient estimator. Further, we also define a curved exponential family of transition matrices. Using a transition matrix version of the Pythagorean theorem, we give an asymptotically efficient estimator for a curved exponential family.
[ { "created": "Thu, 16 Jan 2014 02:35:13 GMT", "version": "v1" }, { "created": "Fri, 6 Jun 2014 12:45:52 GMT", "version": "v2" }, { "created": "Tue, 3 Feb 2015 00:47:52 GMT", "version": "v3" }, { "created": "Tue, 5 May 2015 23:17:37 GMT", "version": "v4" } ]
2016-09-28
[ [ "Hayashi", "Masahito", "" ], [ "Watanabe", "Shun", "" ] ]
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1401.3815
Ning Cai
Ning Cai, and M. Junaid Khan
On Swarm Stability of Linear Time-Invariant Descriptor Compartmental Networks
null
null
10.1049/iet-cta.2014.0130
2015
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Swarm stability is concerned for descriptor compartmental networks with linear time-invariant protocol. Compartmental network is a specific type of dynamical multi-agent system. Necessary and sufficient conditions for both consensus and critical swarm stability are presented, which require a joint matching between the interactive dynamics of nearest neighboring vertices and the Laplacian spectrum of the overall network topology. Three numerical instances are illustrated to verify the theoretical results.
[ { "created": "Thu, 16 Jan 2014 02:39:46 GMT", "version": "v1" } ]
2015-01-13
[ [ "Cai", "Ning", "" ], [ "Khan", "M. Junaid", "" ] ]
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1401.3816
Gabriel Weymouth
Gabriel D. Weymouth, Dick K.P. Yue
Physics-Based Learning Models for Ship Hydrodynamics
null
Journal of Ship Research, Volume 57, Number 1, March 2013 , pp. 1-12(12)
10.5957/JOSR.57.1.120005
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the concepts of physics-based learning models (PBLM) and their relevance and application to the field of ship hydrodynamics. The utility of physics-based learning is motivated by contrasting generic learning models for regression predictions, which do not presume any knowledge of the system other than the training data provided with methods such as semi-empirical models, which incorporate physical insights along with data-fitting. PBLM provides a framework wherein intermediate models, which capture (some) physical aspects of the problem, are incorporated into modern generic learning tools to substantially improve the predictions of the latter, minimizing the reliance on costly experimental measurements or high-resolution high-fidelity numerical solutions. To illustrate the versatility and efficacy of PBLM, we present three wave-ship interaction problems: 1) at speed waterline profiles; 2) ship motions in head seas; and 3) three-dimensional breaking bow waves. PBLM is shown to be robust and produce error rates at or below the uncertainty in the generated data at a small fraction of the expense of high-resolution numerical predictions.
[ { "created": "Thu, 16 Jan 2014 02:40:07 GMT", "version": "v1" } ]
2014-01-17
[ [ "Weymouth", "Gabriel D.", "" ], [ "Yue", "Dick K. P.", "" ] ]
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1401.3818
Xiaoxia Sun
Xiaoxia Sun, Qing Qu, Nasser M. Nasrabadi, Trac D. Tran
Structured Priors for Sparse-Representation-Based Hyperspectral Image Classification
IEEE Geoscience and Remote Sensing Letter
null
10.1109/LGRS.2013.2290531
null
cs.CV cs.LG stat.ML
http://creativecommons.org/licenses/by-nc-sa/3.0/
Pixel-wise classification, where each pixel is assigned to a predefined class, is one of the most important procedures in hyperspectral image (HSI) analysis. By representing a test pixel as a linear combination of a small subset of labeled pixels, a sparse representation classifier (SRC) gives rather plausible results compared with that of traditional classifiers such as the support vector machine (SVM). Recently, by incorporating additional structured sparsity priors, the second generation SRCs have appeared in the literature and are reported to further improve the performance of HSI. These priors are based on exploiting the spatial dependencies between the neighboring pixels, the inherent structure of the dictionary, or both. In this paper, we review and compare several structured priors for sparse-representation-based HSI classification. We also propose a new structured prior called the low rank group prior, which can be considered as a modification of the low rank prior. Furthermore, we will investigate how different structured priors improve the result for the HSI classification.
[ { "created": "Thu, 16 Jan 2014 03:21:26 GMT", "version": "v1" } ]
2014-01-17
[ [ "Sun", "Xiaoxia", "" ], [ "Qu", "Qing", "" ], [ "Nasrabadi", "Nasser M.", "" ], [ "Tran", "Trac D.", "" ] ]
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1401.3824
Xiaohan Wei
Xiaohan Wei, Michael J. Neely
Power Aware Wireless File Downloading: A Constrained Restless Bandit Approach
null
null
null
null
cs.PF
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper treats power-aware throughput maximization in a multi-user file downloading system. Each user can receive a new file only after its previous file is finished. The file state processes for each user act as coupled Markov chains that form a generalized restless bandit system. First, an optimal algorithm is derived for the case of one user. The algorithm maximizes throughput subject to an average power constraint. Next, the one-user algorithm is extended to a low complexity heuristic for the multi-user problem. The heuristic uses a simple online index policy and its effectiveness is shown via simulation. For simple 3-user cases where the optimal solution can be computed offline, the heuristic is shown to be near-optimal for a wide range of parameters.
[ { "created": "Thu, 16 Jan 2014 04:18:47 GMT", "version": "v1" } ]
2014-01-17
[ [ "Wei", "Xiaohan", "" ], [ "Neely", "Michael J.", "" ] ]
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1401.3825
Wiebe van der Hoek
Wiebe van der Hoek, Dirk Walther, Michael Wooldridge
Reasoning About the Transfer of Control
null
Journal Of Artificial Intelligence Research, Volume 37, pages 437-477, 2010
10.1613/jair.2901
null
cs.AI cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present DCL-PC: a logic for reasoning about how the abilities of agents and coalitions of agents are altered by transferring control from one agent to another. The logical foundation of DCL-PC is CL-PC, a logic for reasoning about cooperation in which the abilities of agents and coalitions of agents stem from a distribution of atomic Boolean variables to individual agents -- the choices available to a coalition correspond to assignments to the variables the coalition controls. The basic modal constructs of DCL-PC are of the form coalition C can cooperate to bring about phi. DCL-PC extends CL-PC with dynamic logic modalities in which atomic programs are of the form agent i gives control of variable p to agent j; as usual in dynamic logic, these atomic programs may be combined using sequence, iteration, choice, and test operators to form complex programs. By combining such dynamic transfer programs with cooperation modalities, it becomes possible to reason about how the power of agents and coalitions is affected by the transfer of control. We give two alternative semantics for the logic: a direct semantics, in which we capture the distributions of Boolean variables to agents; and a more conventional Kripke semantics. We prove that these semantics are equivalent, and then present an axiomatization for the logic. We investigate the computational complexity of model checking and satisfiability for DCL-PC, and show that both problems are PSPACE-complete (and hence no worse than the underlying logic CL-PC). Finally, we investigate the characterisation of control in DCL-PC. We distinguish between first-order control -- the ability of an agent or coalition to control some state of affairs through the assignment of values to the variables under the control of the agent or coalition -- and second-order control -- the ability of an agent to exert control over the control that other agents have by transferring variables to other agents. We give a logical characterisation of second-order control.
[ { "created": "Thu, 16 Jan 2014 04:27:53 GMT", "version": "v1" } ]
2014-01-17
[ [ "van der Hoek", "Wiebe", "" ], [ "Walther", "Dirk", "" ], [ "Wooldridge", "Michael", "" ] ]
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1401.3827
Ruijie He
Ruijie He, Emma Brunskill, Nicholas Roy
Efficient Planning under Uncertainty with Macro-actions
null
Journal Of Artificial Intelligence Research, Volume 40, pages 523-570, 2011
10.1613/jair.3171
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Deciding how to act in partially observable environments remains an active area of research. Identifying good sequences of decisions is particularly challenging when good control performance requires planning multiple steps into the future in domains with many states. Towards addressing this challenge, we present an online, forward-search algorithm called the Posterior Belief Distribution (PBD). PBD leverages a novel method for calculating the posterior distribution over beliefs that result after a sequence of actions is taken, given the set of observation sequences that could be received during this process. This method allows us to efficiently evaluate the expected reward of a sequence of primitive actions, which we refer to as macro-actions. We present a formal analysis of our approach, and examine its performance on two very large simulation experiments: scientific exploration and a target monitoring domain. We also demonstrate our algorithm being used to control a real robotic helicopter in a target monitoring experiment, which suggests that our approach has practical potential for planning in real-world, large partially observable domains where a multi-step lookahead is required to achieve good performance.
[ { "created": "Thu, 16 Jan 2014 04:36:09 GMT", "version": "v1" } ]
2014-01-17
[ [ "He", "Ruijie", "" ], [ "Brunskill", "Emma", "" ], [ "Roy", "Nicholas", "" ] ]
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1401.3829
Amy Greenwald
Amy Greenwald, Seong Jae Lee, Victor Naroditskiy
RoxyBot-06: Stochastic Prediction and Optimization in TAC Travel
null
Journal Of Artificial Intelligence Research, Volume 36, pages 513-546, 2009
10.1613/jair.2904
null
cs.GT cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we describe our autonomous bidding agent, RoxyBot, who emerged victorious in the travel division of the 2006 Trading Agent Competition in a photo finish. At a high level, the design of many successful trading agents can be summarized as follows: (i) price prediction: build a model of market prices; and (ii) optimization: solve for an approximately optimal set of bids, given this model. To predict, RoxyBot builds a stochastic model of market prices by simulating simultaneous ascending auctions. To optimize, RoxyBot relies on the sample average approximation method, a stochastic optimization technique.
[ { "created": "Thu, 16 Jan 2014 04:47:45 GMT", "version": "v1" } ]
2014-01-17
[ [ "Greenwald", "Amy", "" ], [ "Lee", "Seong Jae", "" ], [ "Naroditskiy", "Victor", "" ] ]
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1401.3830
Henrik Reif Andersen
Henrik Reif Andersen, Tarik Hadzic, David Pisinger
Interactive Cost Configuration Over Decision Diagrams
null
Journal Of Artificial Intelligence Research, Volume 37, pages 99-139, 2010
10.1613/jair.2905
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In many AI domains such as product configuration, a user should interactively specify a solution that must satisfy a set of constraints. In such scenarios, offline compilation of feasible solutions into a tractable representation is an important approach to delivering efficient backtrack-free user interaction online. In particular,binary decision diagrams (BDDs) have been successfully used as a compilation target for product and service configuration. In this paper we discuss how to extend BDD-based configuration to scenarios involving cost functions which express user preferences. We first show that an efficient, robust and easy to implement extension is possible if the cost function is additive, and feasible solutions are represented using multi-valued decision diagrams (MDDs). We also discuss the effect on MDD size if the cost function is non-additive or if it is encoded explicitly into MDD. We then discuss interactive configuration in the presence of multiple cost functions. We prove that even in its simplest form, multiple-cost configuration is NP-hard in the input MDD. However, for solving two-cost configuration we develop a pseudo-polynomial scheme and a fully polynomial approximation scheme. The applicability of our approach is demonstrated through experiments over real-world configuration models and product-catalogue datasets. Response times are generally within a fraction of a second even for very large instances.
[ { "created": "Thu, 16 Jan 2014 04:48:15 GMT", "version": "v1" } ]
2014-01-17
[ [ "Andersen", "Henrik Reif", "" ], [ "Hadzic", "Tarik", "" ], [ "Pisinger", "David", "" ] ]
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1401.3831
Raghav Aras
Raghav Aras, Alain Dutech
An Investigation into Mathematical Programming for Finite Horizon Decentralized POMDPs
null
Journal Of Artificial Intelligence Research, Volume 37, pages 329-396, 2010
10.1613/jair.2915
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Decentralized planning in uncertain environments is a complex task generally dealt with by using a decision-theoretic approach, mainly through the framework of Decentralized Partially Observable Markov Decision Processes (DEC-POMDPs). Although DEC-POMDPS are a general and powerful modeling tool, solving them is a task with an overwhelming complexity that can be doubly exponential. In this paper, we study an alternate formulation of DEC-POMDPs relying on a sequence-form representation of policies. From this formulation, we show how to derive Mixed Integer Linear Programming (MILP) problems that, once solved, give exact optimal solutions to the DEC-POMDPs. We show that these MILPs can be derived either by using some combinatorial characteristics of the optimal solutions of the DEC-POMDPs or by using concepts borrowed from game theory. Through an experimental validation on classical test problems from the DEC-POMDP literature, we compare our approach to existing algorithms. Results show that mathematical programming outperforms dynamic programming but is less efficient than forward search, except for some particular problems. The main contributions of this work are the use of mathematical programming for DEC-POMDPs and a better understanding of DEC-POMDPs and of their solutions. Besides, we argue that our alternate representation of DEC-POMDPs could be helpful for designing novel algorithms looking for approximate solutions to DEC-POMDPs.
[ { "created": "Thu, 16 Jan 2014 04:49:14 GMT", "version": "v1" } ]
2014-01-17
[ [ "Aras", "Raghav", "" ], [ "Dutech", "Alain", "" ] ]
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1401.3832
Matthew Michelson
Matthew Michelson, Craig A. Knoblock
Constructing Reference Sets from Unstructured, Ungrammatical Text
null
Journal Of Artificial Intelligence Research, Volume 38, pages 189-221, 2010
10.1613/jair.2937
null
cs.CL cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Vast amounts of text on the Web are unstructured and ungrammatical, such as classified ads, auction listings, forum postings, etc. We call such text "posts." Despite their inconsistent structure and lack of grammar, posts are full of useful information. This paper presents work on semi-automatically building tables of relational information, called "reference sets," by analyzing such posts directly. Reference sets can be applied to a number of tasks such as ontology maintenance and information extraction. Our reference-set construction method starts with just a small amount of background knowledge, and constructs tuples representing the entities in the posts to form a reference set. We also describe an extension to this approach for the special case where even this small amount of background knowledge is impossible to discover and use. To evaluate the utility of the machine-constructed reference sets, we compare them to manually constructed reference sets in the context of reference-set-based information extraction. Our results show the reference sets constructed by our method outperform manually constructed reference sets. We also compare the reference-set-based extraction approach using the machine-constructed reference set to supervised extraction approaches using generic features. These results demonstrate that using machine-constructed reference sets outperforms the supervised methods, even though the supervised methods require training data.
[ { "created": "Thu, 16 Jan 2014 04:49:45 GMT", "version": "v1" } ]
2014-01-17
[ [ "Michelson", "Matthew", "" ], [ "Knoblock", "Craig A.", "" ] ]
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1401.3833
Bozhena Bidyuk
Bozhena Bidyuk, Rina Dechter, Emma Rollon
Active Tuples-based Scheme for Bounding Posterior Beliefs
null
Journal Of Artificial Intelligence Research, Volume 39, pages 335-371, 2010
10.1613/jair.2945
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The paper presents a scheme for computing lower and upper bounds on the posterior marginals in Bayesian networks with discrete variables. Its power lies in its ability to use any available scheme that bounds the probability of evidence or posterior marginals and enhance its performance in an anytime manner. The scheme uses the cutset conditioning principle to tighten existing bounding schemes and to facilitate anytime behavior, utilizing a fixed number of cutset tuples. The accuracy of the bounds improves as the number of used cutset tuples increases and so does the computation time. We demonstrate empirically the value of our scheme for bounding posterior marginals and probability of evidence using a variant of the bound propagation algorithm as a plug-in scheme.
[ { "created": "Thu, 16 Jan 2014 04:50:19 GMT", "version": "v1" } ]
2014-01-17
[ [ "Bidyuk", "Bozhena", "" ], [ "Dechter", "Rina", "" ], [ "Rollon", "Emma", "" ] ]
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1401.3834
Shahar Dobzinski
Shahar Dobzinski, Noam Nisan
Mechanisms for Multi-Unit Auctions
null
Journal Of Artificial Intelligence Research, Volume 37, pages 85-98, 2010
10.1613/jair.2950
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present an incentive-compatible polynomial-time approximation scheme for multi-unit auctions with general k-minded player valuations. The mechanism fully optimizes over an appropriately chosen sub-range of possible allocations and then uses VCG payments over this sub-range. We show that obtaining a fully polynomial-time incentive-compatible approximation scheme, at least using VCG payments, is NP-hard. For the case of valuations given by black boxes, we give a polynomial-time incentive-compatible 2-approximation mechanism and show that no better is possible, at least using VCG payments.
[ { "created": "Thu, 16 Jan 2014 04:50:35 GMT", "version": "v1" } ]
2014-01-17
[ [ "Dobzinski", "Shahar", "" ], [ "Nisan", "Noam", "" ] ]
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1401.3835
Ivan Jos\'e Varzinczak
Ivan Jos\'e Varzinczak
On Action Theory Change
null
Journal Of Artificial Intelligence Research, Volume 37, pages 189-246, 2010
10.1613/jair.2959
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
As historically acknowledged in the Reasoning about Actions and Change community, intuitiveness of a logical domain description cannot be fully automated. Moreover, like any other logical theory, action theories may also evolve, and thus knowledge engineers need revision methods to help in accommodating new incoming information about the behavior of actions in an adequate manner. The present work is about changing action domain descriptions in multimodal logic. Its contribution is threefold: first we revisit the semantics of action theory contraction proposed in previous work, giving more robust operators that express minimal change based on a notion of distance between Kripke-models. Second we give algorithms for syntactical action theory contraction and establish their correctness with respect to our semantics for those action theories that satisfy a principle of modularity investigated in previous work. Since modularity can be ensured for every action theory and, as we show here, needs to be computed at most once during the evolution of a domain description, it does not represent a limitation at all to the method here studied. Finally we state AGM-like postulates for action theory contraction and assess the behavior of our operators with respect to them. Moreover, we also address the revision counterpart of action theory change, showing that it benefits from our semantics for contraction.
[ { "created": "Thu, 16 Jan 2014 04:51:08 GMT", "version": "v1" } ]
2014-01-17
[ [ "Varzinczak", "Ivan José", "" ] ]
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