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Advanced Robotics 2009年第12-13期23卷 1687-1702页

作者： Wang, Chieh-Chih Lin, Chi-Hao Hu, Jwu-Sheng Department of Computer Science and Information Engineering Graduate Institute of Networking and Multimedia National Taiwan University Taipei 10617 Taiwan Intelligent Robotics Program of Industrial Technology Research Institute Department of Electrical and Control Engineering National Chiao Tung University HsinChu 310 Taiwan

Auditory perception is one of the most important functions for robotics applications. Microphone arrays are widely used for auditory perception in which the spatial structure of microphones is usually known. In practice, microphone array calibration can be tedious and other devices or means are required. The structure from sound (SFS) approach addresses the problem of simultaneously localizing a set of microphones and a set of acoustic events that provides a great flexibility to calibrate different setups of microphone arrays. However, the existing method does not take measurement uncertainty into account and does not provide uncertainty estimates of the SFS results. In this paper, we propose a probabilistic structure from sound (PSFS) approach using the unscented transform in which the uncertainties of the PSFS results are also available. In addition, a probabilistic sound source localization approach using the PSFS results is provided to improve sound source localization accuracy. The ample results of simulation and experiments using low-cost, off-the-shelf microphones demonstrate the feasibility and performance of the proposed PSFS approach. © 2009 VSP.

关键词： Microphone array

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Gas sensing properties of WO3-doped ZnO nanoparticles synthesized by flame spray pyrolysis

Gas sensing properties of WO3-doped ZnO nanoparticles synthe...

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IEEE SENSORS

作者： Chawarat Siriwong Katcharin Wetchakun Anurat Wisitsoraat Sukon Phanichphant Nanosciences and Nanotechnology Program Graduate School Chiang Mai University Chiang Mai Thailand National Electronics and Computer Technology Center Pathum Thani Thailand Department of Chemistry Faculty of Science Sukon Phanichphant Chiang Mai Thailand

The flame-made (5/5) pure ZnO and WO 3 -doped ZnO nanoparticles containing 0.25, 0.50, and 0.75 mol% of WO 3 were successfully synthesized by flame spray pyrolysis (FSP). These materials were studied for NO 2 , CO and H 2 gas sensing at different gas concentrations and operating temperatures ranging from 300-400°C in dry air. The crystalline phase, morphology and size of the nanoparticles were characterized by XRD, BET, TEM, SEM and EDS in order to correlate physical properties with gas sensing performance. The gas-sensing results showed that WO 3 doping significantly enhanced NO 2 gas-sensing performance of ZnO nanoparticles. In addition, 0.5 mol% is found to be an optimal WO 3 concentration which gives the highest sensitivity towards NO 2 .

关键词： Zinc oxide Nanoparticles Fires Thermal spraying Crystalline materials Temperature distribution Temperature sensors Crystallization Morphology X-ray scattering

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Optimality of Affine Policies in Multi-stage Robust Optimization

Optimality of Affine Policies in Multi-stage Robust Optimiza...

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Joint 48th IEEE Conference on Decision and Control and 28th Chinese Control Conference

作者： Dimitris Bertsimas Dan A.Iancu Pablo A.Parrilo Faculty of the Sloan School of Management and the Operations Research Center Massachusetts Institute of Technology the Operations Research Center Massachusetts Institute of Technology the Laboratory for Information and Decision Systems and the Faculty of Electrical Engineering and Computer Science Massachusetts Institute of Technology

In this paper,we prove the optimality of disturbance-affine control policies in the context of onedimensional,box-constrained,multi-stage robust *** results cover the finite horizon case,with minimax(worstcase) objective,and convex state costs plus linear control *** proof methodology,based on techniques from polyhedral geometry,is elegant and conceptually simple,and entails efficient algorithms for the case of piecewise affine state costs,when computing the optimal affine policies can be done by solving a single linear program.

关键词： Optimality of Affine Policies in Multi-stage Robust Optimization

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Recent development of the HMM-based speech synthesis system (HTS)

Recent development of the HMM-based speech synthesis system ...

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Asia-Pacific Signal and information Processing Association 2009 Annual Summit and Conference, APSIPA ASC 2009

作者： Zen, Heiga Oura, Keiichiro Nose, Takashi Yamagishi, Junichi Sako, Shinji Toda, Tomoki Masuko, Takashi Black, Alan W. Tokuda, Keiichi Department of Computer Science Nagoya Institute of Technology Nagoya 466-8555 Japan Department of Information Processing Interdisciplinary Tokyo Institute of Technology Yokohama 226-8502 Japan Centre for Speech Technology Research University of Edinburgh Edinburgh EH8-9LW United Kingdom Graduate School of Information Science Nara Institute of Science and Technology Ikoma 630-0192 Japan Language Technologies Institute Carnegie Mellon University Pittsburgh PA 15213 United States Cambridge Research Laboratory Toshiba Research Europe Limited Cambridge CB4 0GZ United Kingdom Corporate Research and Development Center Toshiba Corporation Kawasaki 212-8582 Japan

A statistical parametric approach to speech synthesis based HMMs has grown in popularity over the last few years. In this approach, spectrum, excitation, and duration of speech are simultaneously modeled by context-dependent HMMs, and speech waveforms are generated from the HMMs themselves. Since December 2002, we have publicly released an opensource software toolkit named "HMM-based speech synthesis system (HTS)" to provide a research and development toolkit for statistical parametric speech synthesis. This paper describes recent developments of HTS in detail, as well as future release plans.

关键词： Speech synthesis

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Intrinsically organized network for face perception during the resting state

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Neuroscience Letters 2009年第1期454卷 1-5页

作者： Zhang, Hui Tian, Jie Liu, Jiangang Li, Jun Lee, Kang Institute of Automation Chinese Academy of Sciences Graduate School the Chinese Academy of Sciences. Beijing 100190 China Life Science Research Center School of Electronic Engineering Xidian University Xi'an Shaanxi 710071 China School of Computer and Information Technology Beijing Jiaotong University Beijing 1000441 China Institute of Child Study University of Toronto Toronto Ont. Canada

We investigated 0.01-0.08 Hz low-frequency fluctuations of BOLD-fMRI signals in the face and object-responsive regions during the resting-state and during face or object viewing tasks. By comparing the effects of the face-responsive regions of interest with those of the object-responsive regions of interest, we observed a distributed cortical network of face perception during the resting-state among posterior fusiform gyrus, inferior occipital gyrus, and superior temporal sulcus. This network was also significantly activated during the face perception task. The face perception task also activated additional areas in the frontal and parietal regions. Our results suggest that the "core" but not the "extended" network for face processing is already in some form of activation during the resting-state. A possible function of the resting-state face perception network is perhaps to prepare the brain to process faces that individuals are highly likely to encounter in their environment. © 2009 Elsevier Ireland Ltd.

关键词： Core and extended networks Face processing fMRI Resting-state

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Precise extraction of moving objects in video stream

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Kyokai Joho Imeji Zasshi/Journal of the Institute of Image information and Television Engineers 2009年第11期63卷 1574-1584页

作者： Tehrani, Mehrdad Panahpour Ishikawa, Akio Naito, Sei Sakazawa, Shigeyuki Koike, Atsushi Ultra Realistic Communications Laboratory KDDI RandD Laboratories Inc. 2-1-15 Ohara Fujimino Saitama 356-8502 Japan Department of Electrical Engineering and Computer Science Graduate School of Engineering Nagoya University Furo-cho Chikusa-ku Nagoya 464-8603 Japan Department of Computer and Information Science Faculty of Science and Technology Seikei University 3-3-1 Kichijoji-Kitamachi Musashino-shi Tokyo 180-8633 Japan

We propose an automatic and precise moving-object extraction method for use in video streams that can also be used for 3-D system applications. The method generates a statistical model for each pixel using several frames, and then uses it to generate trimap images. After manually initializing a frame, unknown regions are automatically determined either background or foreground for the rest of frames. The key technology proposed is an adaptive training scheme, which estimates detection thresholds locally through the algorithm, followed by matting approaches using an iterative process and weighted statistical distance minimization. Experiments demonstrate outperformance of our method for both indoor and outdoor video streams, and also for 3-D modeling and representation.

关键词： Extraction

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Feature extraction from EEG signals in P300 spelling system

Feature extraction from EEG signals in P300 spelling system

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SICE Annual Conference

作者： Kana Omori Tomonari Yamaguchi Katsuhiro Inoue Kyushu Institute of Technology Fukuoka Japan Department of Systems Innovation and Informatics Graduate school of Computer Science and Technology Kyushu Institute of Technology 680-4 Kawazu Iizuka Fukuoka 820-8502 Japan Department of Systems Innovation and Informatics Faculty of Computer Science and Technology Kyushu Institute of Technology 680-4 Kawazu Iizuka Fukuoka 820-8502 Japan

Recently, there are many studies on brain computer interface (BCI) system and some use EEG response at oddball paradigms. The aim of this paper is to extract feature (i.e. P300 response) from the EEG signals to improve the spelling system. We propose the method to analyze the averaged EEG signal concerned time and spatial. It is confirmed that the processing period with feature extraction is able to be shortened by averaging multi-channels. Effective information is obtained from the EEG signal near of the center part.

关键词： Feature extraction Electroencephalography Enterprise resource planning Brain computer interfaces Technological innovation Informatics computer science Data mining Pattern recognition Scalp

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Rapid modeling and analysis with QGENIE

Rapid modeling and analysis with QGENIE

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International Multiconference on computer science and information technology, IMCSIT

作者： Marek J. Drużdżel Faculty of Computer Science Białystok Technical University (BTU) Bialystok Poland Decision Systems Laboratory School of Information Sciences and Intelligent Systems Program University of Pittsburgh Pittsburgh PA USA

QGENIE is a specialized interface to GENIE, a decision modeling environment developed by the Decision Systems Laboratory, University of Pittsburgh. QGENIE allows for rapid construction of graphical models in which all variables are propositional, almost no numerical probabilities are displayed at the user interface, and degrees of truth of propositions are displayed by means of node colors. All numerical parameters, such as prior probability distributions over variables and strengths of influences between variables, are entered by means of graphical sliders. While the underlying computations are all numerical and based on Bayesian updating, QGENIE makes the impression of a qualitative, ¿order of magnitude¿ type system that aids rapid model building and an approximate analysis of systems.

关键词： Bayesian methods User interfaces Probability distribution Random variables Business Brain modeling computer science Graphical models Predictive models information technology

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Hybrid test vector compression in system-on-chip test — An overview and methodology

Hybrid test vector compression in system-on-chip test — An ...

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International Conference on computers and Devices for Communication (CODEC)

作者： Satyendra N. Biswas Sunil R. Das Emil M. Petriu Altaf Hossain Department of Electrical Engineering Technology Georgia Southern University Statesboro GA USA School of Information Technology and Engineering Faculty of Engineering University of Ottawa Ottawa ONT Canada Department of Computer and Information Science College of Arts and Sciences Troy University Montgomery AL USA

This paper presents a comprehensive study on a number of hybrid test vector compression methods for VLSI circuit testing. In the proposed approaches, a software program is loaded into the on-chip processor memory along with the compressed test data sets. To minimize on-chip storage besides testing time, the test data volume is first reduced by compaction in a hybrid manner before downloading into the processor. The methods utilize a set of adaptive coding techniques for realizing lossless compression. The compaction program need not be loaded into the embedded processor, as only the decompression of test data is required for the automatic test equipment. The developed schemes necessitate minimal hardware overhead, while the on-chip embedded processor can be reused for normal operation on completion of testing. As an extension of the earlier works, this paper also reports further results on studies of the problem and demonstrates the feasibility of the suggested methodologies with simulation results on ISCAS 85 combinational and ISCAS 89 full scan sequential benchmark circuits.

关键词： System testing System-on-a-chip Circuit testing Compaction Very large scale integration Software testing Adaptive coding Automatic testing Automatic test equipment Hardware

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Certified Trust Model

IFIP Advances in Information and Communication Technology

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IFIP Advances in information and Communication technology 2009年 296卷 41-49页

作者： Botêlho, Vanderson Enembreck, Fabríco Ávila, Bráulio C De Azevedo, Hilton Scalabrin, Edson E PUCPR Pontifical Catholic University of Paraná PPGIA Graduate Program on Applied Computer Science R. Imaculada Conceição Curitiba PR1155 Brazil UTFPR Federal Technological University of Paraná PPGTE Graduate Program on Technology Av. 7 de Setembro Curitiba PR3165 Brazil

This paper presents a certified confidence model which aims to ensure credibility for information exchanged among agents which inhabit an open environment. Generally speaking, the proposed environment shows a supplier agent b which delivers service for a customer agent a. The agent a returns to b a cryptographed evaluation r on the service delivered. The agent b will employ R as testimonial when requested to perform the same task for a distinct customer agent. Our hypotheses are: (i) control over testimonials can be distributed as they are locally stored by the assessed agents, i.e., each assessed agent is the owner of its testimonials;and (ii) testimonials, provided by supplier agents on their services, can be considered reliable since they are encapsulated with public key cryptography. This approach reduces the limitations of confidence models based, respectively, on the experience resulted from direct interaction between agents (direct confidence) and on the indirect experience obtained from reports of witnesses (propagated confidence). Direct confidence is a poor-quality measure for a customer agent a hardly has enough opportunities to interact with a supplier agent b so as to grow a useful knowledge base. Propagated confidence depends on the willingness of witnesses to share their experiences. The empiric model was tested in a multiagent system applied to the stock market, where supplier agents provide recommendations for buying or selling assets and customer agents then choose suppliers based on their reputations. Results demonstrate that the confidence model proposed enables the agents to more efficiently choose partners. © 2009, Springer New York LLC. All rights reserved.

关键词： Multi agent systems

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