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作者： Wan, Shenghua Yin, Zhao Zhang, Kang Zhang, Hongchao Li, Xin Department of Electrical and Computer Engineering Center for Computation and Technology Louisiana State University Baton Rouge 70803 United States Department of Automation Xiamen University Xiamen 361005 China Department of Mathematics Louisiana State University Baton Rouge 70803 United States

We present an effective optimization framework to compute polycube mapping. Composed of a set of small cubes, a polycube well approximates the geometry of the free-form model yet possesses great regularity;therefore, it can serve as a nice parametric domain for free-form shape modeling and analysis. Generally, the more cubes are used to construct the polycube, the better the shape can be approximated and parameterized with less distortion. However, corner points of a polycube domain are singularities of this parametric representation, so a polycube domain having too many corners is undesirable. We develop an iterative algorithm to seek for the optimal polycube domain and mapping, with the constraint on using a restricted number of cubes (therefore restricted number of corner points). We also use our polycube mapping framework to compute an optimal common polycube domain for multiple objects simultaneously for lowly distorted consistent parameterization. © 2011 Elsevier Ltd. All rights reserved.

关键词： Mapping

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Universal image steganalysis against spatial-domain steganography based on energy distribution of singular values

Universal image steganalysis against spatial-domain steganog...

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7th International Conference on Information Technology and Application, ICITA 2011

作者： Shojaei-Hashemi, Anahita Soltanian-Zadeh, Hamid Ghaemmagham, Shahrokh Kamarei, Mahmoud School of Electrical and Computer Engineering College of Engineering University of Tehran Tehran Iran Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering University of Tehran Tehran Iran Image Analysis Laboratory Department of Radiology Henry Ford Health System Detroit MI United States Electronics Research Institute Sharif University of Technology Tehran Iran

ISBN: (纸本)9780980326741

A passive image steganalysis method is proposed to universally detect spatial-domain steganography schemes. It is shown to have better performance than universal steganalyzers known to be powerful in spatial domain, including the WFLogSv and the WAM methods. This level of accuracy is the result of improving the WFLogSv steganalyzer by considering a more comprehensive relationship between the singular values of each image block and the linear correlation of the rows and the columns. That is, instead of the closeness of the lower singular values to zero, the energy distribution of the singular values is investigated. An innovative measure is proposed for this investigation, which is inspired from arithmetic mean-geometric mean inequality. Experimental results confirm the supremacy of the proposed steganalysis scheme over its counterparts.

关键词： Singular value decomposition

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Universal steganalysis based on local prediction error in wavelet domain

Universal steganalysis based on local prediction error in wa...

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7th International Conference on Intelligent Information Hiding and Multimedia Signal Processing, IIHMSP 2011

作者： Shojaei-Hashemi, Anahita Mehdipour-Ghazi, Mostafa Ghaemmaghami, Shahrokh Soltanian-Zadeh, Hamid School of Electrical and Computer Engineering College of Engineering University of Tehran Tehran Iran Electronics Research Institute Sharif University of Technology Tehran Iran Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering University of Tehran Tehran Iran Image Analysis Laboratory Department of Radiology Henry Ford Health System Detroit MI United States

ISBN: (纸本)9780769545172

A passive universal image steganalysis method is proposed that is shown to be of higher detection accuracy than existing truly blind steganalysis methods including Farid's and the WAM. This is achieved by improving some weaknesses of Farid's steganalysis scheme in feature extraction, that is, instead of deriving an over-determined equation system for each sub band of the wavelet decomposition, the sub bands are divided into overlapping blocks and an over-determined equation system is constructed for each block. To guarantee the existence of finite answers, the over-determined equation systems are solved in a way different from Farid's by using Moore-Penrose pseudo-inverse concept. Further improvement to the performance is achieved by adding diagonal directions and increasing the number of moments. The comparative evaluations confirm the superiority of the proposed method over prevalent blind steganalysis schemes. © 2011 IEEE.

关键词： Wavelet decomposition

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Corrigendum to “Conformational Heterogeneity of the SAM-I Riboswitch Transcriptional ON State: A Chaperone-Like Role for S -Adenosyl Methionine” [ J. Mol. Biol. 418 (2012) 331–349]

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Journal of Molecular Biology 2012年第3期420卷 258-258页

作者： Wei Huang Joohyun Kim Shantenu Jha Fareed Aboul-ela Department of Biological Science Louisiana State University Baton Rouge LA 70803 USA Center for Computation & Technology Louisiana State University Baton Rouge LA 70803 USA Department of Electrical and Computer Engineering Rutgers University Piscataway NJ 08854 USA

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Slow-light enhanced absorption switches in metal-dielectric-metal plasmonic waveguides

Slow-light enhanced absorption switches in metal-dielectric-...

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作者： Min, Changjun Veronis, Georgios Center for Computation and Technology Louisiana State University Baton Rouge LA 70803 United States Department of Electrical and Computer Engineering Louisiana State University Baton Rouge LA 70803 United States

We introduce slow-light enhanced absorption switches in subwavelength metal-dielectric-metal plasmonic waveguides. Both decent modulation depth and moderate insertion loss can be achieved in such switches by small ind... 详细信息

ISBN: (纸本)9781557529107

关键词： Slow light

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Wavelet-based EEG denoising for automatic sleep stage classification

Wavelet-based EEG denoising for automatic sleep stage classi...

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21st International Conference on Electronics Communications and computers, CONIELECOMP 2011

作者： Estrada, Edson Nazeran, Homer Sierra, Gustavo Ebrahimi, Farideh Setarehdan, S. Kamaledin Department of Electrical and Computer Engineering University of Texas at El Paso El Paso TX United States Instituto de Ciencias BiomédicasUniversidad Autónoma de Ciudad Juárez Cd. Juárez Chih Mexico Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran Tehran Iran

ISBN: (纸本)9781424495573

In automatic sleep stage classification, as in any other signal processing task involving the easily contaminated EEG signals, denoising constitutes a crucial pre-processing step that must be addressed before carrying out further analysis on the EEG signals. Discrete wavelet transform offers an effective solution for denoising nonstationary signals such as EEG due to its shrinkage property. In this paper, we explored the application of wavelet denoising method to EEG signals acquired during different sleep stages classified according to the RK rules, with the objective to identify suitable thresholding rules and threshold values. Preliminary results showed that the combination of soft thresholding rule applied to the Detailed wavelet coefficients with the Universal threshold value produced better performance measures such as a smaller Minimum Squared Error (MSE) and a larger signal-to-Noise Ratio (SNR). Similarly improved results were obtained for Stage 1, Stage 2, Stage 3, Stage 4 and REM stage EEG signals using this combination. Such thresholding rule and values are equally well applicable to denoising EEG epochs acquired from deep sleep stages. © 2011 IEEE.

关键词： Signal to noise ratio

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Fast Outcome Prediction based on Slow Cause Estimation: A human Inspired Approach in Air hockey game

Fast Outcome Prediction based on Slow Cause Estimation: A hu...

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IEEE International Conference on Robotics and Biomimetics

作者： S. A. Ghazvini H. Moradi M. Nili Ahmadabadi B. Araabi School of Electrical and Computer Engineering the University of Tehran Control and Intelligent Processing Center of Excellence at the Electrical and Computer Engineering Department at the University of Tehran

ISBN: (纸本)9781457721366

In this paper, we present an approach, inspired by human behavior, in predicting the state of a high speed object based on the state of another object that causes such a high speed, e.g. predicting the state of a high speed puck which is hit by a lower speed paddle in the air hockey game. The proposed approach eliminates the need for high speed sensors, such as high speed cameras and grabbers, for capturing and processing high speed motions. This approach has been implemented and tested on an air hockey simulator and in real images taken by an off-the-shelf camera. The results show that the low speed of a paddle in the air hockey can be easily captured by an off-the-shelf camera and then the state of the puck, which is the speed and its pose, after being hit by the paddle can be calculated.

关键词： Blades Prognosis Hockey Puck High speed speed sensor Cameras-High speed low speed Human behavior air Respiratory Inspiration Hunting Game theory Game animals

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Hide-and-Seek with Directional Sensing *

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IFAC Proceedings Volumes 2011年第1期44卷 9343-9348页

作者： Alessandro Borri Shaunak D. Bopardikar Joao P. Hespanha Maria D. Di Benedetto Department of Electrical Engineering University of L'Aquila Italy Center for Control Dynamical Systems and Computation University of California at Santa Barbara CA 93106 USA

Abstract We consider a game played between a hider, who hides a static object in one of several possible positions in a bounded planar region, and a searcher, who wishes to reach the object by querying sensors placed in the plane. The searcher is a mobile agent, and whenever it physically visits a sensor, the sensor returns a random direction, corresponding to a half-plane in which the hidden object is located. We first present a novel search heuristic and characterize bounds on the expected distance covered before reaching the object. Next, we model this game as a large-dimensional zero-sum dynamic game and we apply a recently introduced randomized sampling technique that provides a probabilistic level of security to the hider. We observe that, when the randomized sampling approach is only allowed to select a very small number of samples, the cost of the heuristic is comparable to the security level provided by the randomized procedure. However, as we allow the number of samples to increase, the randomized procedure provides a higher probabilistic security level.

关键词：

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Synergistic Potential Functions for Hybrid control of Rigid-Body Attitude

Synergistic Potential Functions for Hybrid Control of Rigid-...

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2011 American control Conference (ACC)

作者： Christopher G. Mayhew Andrew R. Teel Robert Bosch Limited Liability Company Palo Alto CA USA Center for Control Engineering and Computation Electrical and Computer Engineering Department University of California Santa Barbara CA USA

Achieving global asymptotic stabilization of rigid-body attitude is impossible using smooth feedback;however, this obstruction can be overcome using a hybrid controller that coordinates a "synergistic" family of potential functions and their corresponding feedbacks. In this paper, we show that it is impossible to construct a synergistic family of potential functions from the widely used class of "modified trace functions," despite the fact that one can choose a subset of these functions whose only common critical point is the identity element. With this as motivation, we introduce a parametrized diffeomorphism that is capable of altering the critical behavior of potential functions and generating a synergistic family, paving the way for global asymptotic attitude stabilization of rigid-body attitude by hybrid feedback.

关键词： Attitude control Asymptotic stability Jacobian matrices Lyapunov methods Eigenvalues and eigenfunctions Aerospace electronics Context

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Wideband spectrum sensing experiments in indoor wireless channels

Wideband spectrum sensing experiments in indoor wireless cha...

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International Teletraffic Congress, ITC 21

作者： N. Misiunas P. Gandhi R. Remany K. Chandra C. Thompson Center for Advanced Computation and Telecommunications Department of Electrical and Computer Engineering University of Massachusetts Lowell Lowell MA USA

In this work, spectrum sensing experiments are conducted in indoor wireless channels using state-of-the-art commercial software radio transceivers. The objective is to evaluate the performance of cooperative spectrum sensing of wideband channels and determine achievable gains against the limiting effects of multipath interference, frequency-selective and correlated fading. To this end, the energy and temporal correlation metrics of narrowband signals embedded in a wideband transmit signal are examined with varying transmitter-receiver positions. It is shown that whereas the energy metric of signal carrying bands becomes indistinguishable from that of empty bands with increasing distance and in non line-of-sight conditions, the temporal correlation features of modulated active channels are retained when sensing relatively longer distances from the transmitter, even in a highly multipath environment.

关键词： Correlation Sensors Receivers Radio transmitters Radio frequency Wideband Software radio

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