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International Symposium Semiconductor Device Research (ISDRS)

作者： M.A. Karami A. Afzali-Kusha R. Faraji-Dana Nanoelectronics center of Excellence Department of Electrical and Computer Engineering University of Tehran Iran

In this paper the spontaneous emission modification and coupling factor was calculated for evaluating the microcavity effects of nanowire lasers. This calculation was performed for hexagonally shaped nanowire lasers by finite integral simulations, where dipoles at different positions of nanowire laser and different orientations were examined.

关键词： Spontaneous emission Vertical cavity surface emitting lasers Surface emitting lasers Optical coupling Nanoscale devices Microcavities Stimulated emission Optical sensors Laser modes Semiconductor lasers

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An ontology-based dictionary of understanding as a basis for software agents with understanding abilities

An ontology-based dictionary of understanding as a basis for...

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2007 Agent Directed Simulation Symposium, ADS 2007

作者： Ören, Tuncer I. Ghassem-Aghaee, Nasser Yilmaz, Levent M and SNet Ottawa Center of the MISS SITE University of Ottawa OttawaON Canada Beykent University Istanbul Turkey Department of Computer Engineering University of Isfahan Isfahan Iran M and SNet: Auburn Modeling and Simulation Laboratory Computer Science and Software Engineering Auburn University AuburnAL United States

Nearly 60 types of machine understanding is presented in an ontology-based dictionary as a basis for the development of software agents with understanding abilities. Then a framework for software agents is presented.

ISBN: (纸本)1565553136

关键词： software agents

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Using supervised fuzzy clustering and cwt for ventricular late potentials (vlps) detection in high-resolution ecg signal

Using supervised fuzzy clustering and cwt for ventricular la...

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5th Conference of the European Society for Fuzzy Logic and Technology, EUSFLAT 2007

作者： Khorshidi, Gholamreza Salimi Jaafari, Ayyoub Pourmorteza, Amir Motie, Ali Golpayegani, Mohammadreza Hashemi School of Cognitive Sciences Institute for Studies in Theoretical Physics and Mathematics Tehran Iran Faculty of Biomedical Engineering Amirkabir University of Technology Tehran Iran Iran Control and Intelligent Processing Center of Excellence Electrical and Computer Engineering Department University of Tehran Tehran Iran Nasrabadi Group of Biomedical Engineering Faculty of Engineering Shahed University Tehran Iran

ISBN: (纸本)9788073683863

Ventricular Late Potentials (VLPs) are lowamplitude, high-frequency components that appear at the end of the QRS complex of a High-Resolution ECG (HRECG) record. VLPs are clinically useful for identifying post-MI (Myocardial Infarction) patients prone to Ventricular Tachycardia (VT) and Sudden Cardiac Death (SCD). In this paper, the Continuous Wavelet Transform (CWT) and a supervised fuzzy clustering algorithm are used together to detect VLP. The terminal part of the QRS complex in the Vector Magnitude (VM) waveform is processed with the CWT to extract a feature vector. Resulting time-frequency representation is subdivided into several sub bands, and the sum of the squared decomposition coefficients is computed in each region. Finally, a supervised Fuzzy clustering method, trained by an appropriate set of these feature vectors, is applied to this data in order to identify VLP.

关键词： Electrocardiograms

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Basic Movements of a Nonholonomic Wheel-Based Pole Climbing Robot

Basic Movements of a Nonholonomic Wheel-Based Pole Climbing ...

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2007 IEEE/ASME International Conference on Advanced Intelligent Mechatronics, Pages 805-1210

作者： Sara Mahdavi Ehsan Noohi Majid Nili Ahmadabadi Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran

ISBN: (纸本)9781424412631;1424412633

Three basic movements for path planning of a nonholonomic wheel-based pole climbing robot, UT-PCR, are proposed. In order to simplify the system equations, the state equations are first derived in the velocity space in which the nonholonomic constraint is easily shown. Subsequently, according to the derived equations, three basic movements are defined and a suitable control method is proposed. Finally, the proposed movements and the control method are tested via simulations.

关键词： Climbing Robot Nonholonomic Systems Basic Movements

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Modeling and design of control algorithms over wireless networks

Modeling and design of control algorithms over wireless netw...

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IEEE Conference on Control Technology and Applications (CCTA)

作者： M.D. Di Benedetto A. D'Innocenzo C. Rinaldi F. Santucci E. Serra Department of Electrical and Computer Engineering and Center of Excellence DEWS University of L'' Aquila Italy

A major problem in control over wireless networks is conceiving a joint control and communication system design to optimize a given cost function. To solve this problem we have recently proposed a theoretical framework based on the Platform Based Design (PBD). The first step consists in mapping control specifications onto communication network specifications: this involves parameters as quantization noise, coding and modulation scheme, and power level. Next, a communication scheme is chosen so that the control specifications are satisfied. Hybrid models are exploited in order to capture the intrinsic discrete-continuous behaviors, and the developed framework is able to account for safety specifications that often occur in industrial control systems. While in our previous work we have been concerned with modeling efforts, in this paper we focus on the development of control methodologies and provide an example of application within a test case that is currently considered within the project HYCON.

关键词： Algorithm design and analysis Wireless networks Communication system control Control systems Communication systems Design optimization Cost function Communication networks Quantization Noise level

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New criteria for selecting differentially expressed genes

New criteria for selecting differentially expressed genes

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作者： Loo, Lit-Hsin Roberts, Samuel Hrebien, Leonid Kam, Moshe MathWorks United Kingdom Department of Electrical and Computer Engineering Drexel University IEEE Aerospace Medical Association Drexel University National Security Agency Center of Excellence in Information Assurance Education Dept. of Electrical and Computer Engineering Drexel University 3141 Chestnut St. Philadelphia PA 19104 United States

One of the major concerns in detecting changes in higher moments is these changes may be due to outliers or process errors that are not biologically significant. For example, a larger variance observed in the expression levels may simply due to the larger variation in the data collecting process. Several outliers, which exhibit some extreme expression levels than the rest of the samples, may also increase the variance or skewness of the expression levels significantly. So it is very important to reduce the effect of outliers and process errors by proper experimental designs [27], such as technical replicates and biological replicates, before high sensitivity criterion, such as ADS, can be applied. We have presented and demonstrated the operation of two new criteria, ADS and the MDS, for identifying differentially expressed genes. These two criteria were compared with several commonly used criteria, namely WTS, WRS, FCS, and ICE. Experiments with simulated data show ADS to be more powerful than the WTS. When high-sensitivity screening is required, ADS appears to be preferable to WTS. When an FPR similar to WTS is desired, MDS should be used. The popular Wilcoxon rank sum is a more conservative approach that should be employed when the lowest FPR is desired, even at the expense of lower TPRs. ICE is a less desirable criterion because it does not perform well for data generated by the normal model. FCS gave results similar to those of WTS. Evaluation of these algorithms using real biological datasets showed that ADS and MDS flagged several biologically significant genes that were missed by WTS, besides selecting most of the genes that are also selected by WTS. ©2007IEEE.

关键词： Genes

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Approach for runtime monitoring of WS-BPEL processes

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Tien Tzu Hsueh Pao/Acta Electronica Sinica 2007年第SUPPL. 2期36卷 174-178页

作者： Chen, Jin-Liang Wu, Guo-Quan Wei, Jun Technology Center of Software Engineering Institute of Software Chinese Academy of Sciences Beijing 100080 China Department of Computer Science and Technology University of Science and Technology of China Hefei 230026 China

As a service-based language, WS-BPEL is widely adopted into enterprise solutions. However, because of the intrinsic flexibility and dynamism of the web services it used, its behavior couldn't be foreseen until it is running, runtime monitoring is needed. The paper introduces an approach of dynamic monitoring of WS-BPEL processes. It uses Past Linear Temporal Language (PLTL) to describe monitor rules, with the support of Aspect Oriented Programming (AOP). This approach, which has been implemented on OnceBPEL, a BPEL engine designed by ISCAS, can be applied to runtime monitoring of WS-BPEL processes effectively.

关键词： Web services

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Lessons learned through driving science applications in the PRAGMA grid

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International Journal of Web and Grid Services 2007年第3期3卷 287-312页

作者： Zheng, Cindy Katz, Mason J. Papadopoulos, Phil M. Abramson, David Ayyub, Shahaan Enticott, Colin Garic, Slavisa Goscinski, Wojtek Arzberger, Peter Lee, Bu Sung Phatanapherom, Sugree Sriprayoonsakul, Somsak Uthayopas, Putchong Tanaka, Yoshio Tanimura, Yusuke Tatebe, Osamu San Diego Supercomputer Center San Diego CA United States Monash University Clayton VIC Australia University of California San Diego CA United States School of Computer Engineering Nanyang Technological University Singapore Singapore Thai National Grid Center Software Industry Promotion Agency Thailand National Institute of Advanced Industrial Science and Technology Japan Department of Computer Science University of Tsukuba Tsukuba Japan

This paper describes the coordination, design and implementation of the PRAGMA Grid. Applications in genomics, quantum mechanics, climate simulation, organic chemistry and molecular simulation have driven the middleware requirements, and the PRAGMA Grid provides a mechanism for science and technology teams to collaborate, for grids to interoperate and for international users to share software beyond the essential, de facto standard Globus core. Several middleware tools developed by researchers within PRAGMA have been deployed in the PRAGMA grid and this has enabled significant insights, improvements and new collaborations to flourish. In this paper, we describe how human factors, resource availability and performance issues have affected the middleware, applications and the grid design. We also describe how middleware components in grid monitoring, grid accounting and grid file systems have dealt with some of the major characteristics of our grid. We also briefly describe a number of mechanisms that we have employed to make software easily available to PRAGMA and global grid communities. Copyright © 2007 Inderscience Enterprises Ltd.

关键词： Grid computing

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A Criterion Function for Broken Bar Fault Diagnosis in Induction Motor under Load Variation using Wavelet Transform

A Criterion Function for Broken Bar Fault Diagnosis in Induc...

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International Conference on Electrical Machines and Systems 2007(ICEMS2007)(第十届国际电机与系统会议)

作者： B.M. Ebrahimi B. Asaie R. Rajabioun Jawad Faiz H. A. Toliyat Department of Electrical and Computer Engineering Center of Excellence on Applied Electromagnetic S Department of Electrical and Computer Engineering University of Texas A&M Texas USA.

In this paper a novel criterion function is introduced to diagnose the breakage in rotor bars, which uses wavelet transform (WT) to process the stator current signal in faulty induction motors. This criterion function facilitates the diagnosis of fault in induction motors under load variation, precisely. The proposed function is based on wavelet coefficients of stator current in a specific frequency band. Meanwhile, in this paper broken rotor bar in induction motor is detected using spectrum analysis of stator current. It is also shown that increasing the load makes an increase in harmonic components amplitude of a faulty induction motor. A Time stepping finite element (TSFE) method is used for modeling broken rotor bar faults in induction motors. In this modeling, the effects of the spatial distribution of the stator winding, non uniform air-gap permeance, geometrical and physical characteristics of different parts of the motor, and finally non-linearity of the core materials are taken into account. The proposed algorithm is applied to the stator current of a healthy and faulty induction motor. The simulation results are obtained and their accuracy is verified by experimental results.

关键词： Fault diagnosis Induction motors Load management Wavelet transforms Rotors Stator cores Bars Signal processing Wavelet coefficients Frequency

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Applying Concept Algebra to Information Restructuring of Web Documents

Applying Concept Algebra to Information Restructuring of Web...

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Canadian Conference on Electrical and computer engineering (CCECE)

作者： Kai Hu Yingxu Wang Theoretical and Empirical Software Engineering Research Center Department of Electrical and Computer Engineering Schulich School of Engineering University of Calgary Calgary AB Canada

On the basis of concept algebra, this article presents a hierarchical model for web document restructuring and comprehension. The formal model for information restructuring of web documents is built on decoding the external knowledge representation in informal documents into cognitive knowledge represented by concept algebra and concept networks. The semantic relations between concepts in a document are expressed by semantic links among concepts. To automatically implement the information restructuring by machines, a two level knowledge base that mimic human lexical, syntactical, and semantic cognition is introduced. The information restructuring model provides a foundation for automatic concept indexing and knowledge extraction from web documents.

关键词： Algebra Knowledge representation Humans Data mining Natural languages Cognition software engineering Decoding Indexing Knowledge engineering

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