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物理学报 2006年第12期55卷 6585-6588页

作者：蔡建臻朱宏伟吴德海刘峰吕力中国科学院物理研究所 Department of Electrical and Computer Engineering and Center for Computation and Technology Louisiana State University Baton Rouge 70803 USA 清华大学机械工程系 Department of Materials Science and Engineering University of Utah Salt Lake City 84112 USA

单壁碳纳米管在高压下会发生结构相变,导致金属型的碳纳米管变成半导体.相变后碳纳米管中电子的库仑关联的表现形式发生变化,从Luttingerliquid行为转变成环境量子涨落行为.同时,相变后电子波函数的相位关联导致弱局域化行为的出现.为... 详细信息

单壁碳纳米管在高压下会发生结构相变,导致金属型的碳纳米管变成半导体.相变后碳纳米管中电子的库仑关联的表现形式发生变化,从Luttingerliquid行为转变成环境量子涨落行为.同时,相变后电子波函数的相位关联导致弱局域化行为的出现.为了研究库仑关联和相位关联之间是否有相互影响,使用金刚石对顶砧和液压自锁高压包在0—10GPa准静压范围内测量了单层碳纳米管样品在低温和不同磁场下的微分电导随偏压的依赖关系.实验结果表明,相位关联和库仑关联是两种独立的效应,各自影响着电子的输运行为.

关键词：单层碳纳米管高压微分电导

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Auto-tune Predictive control of Switched Reluctance Motor

Auto-tune Predictive Control of Switched Reluctance Motor

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Arash Sadeghzadeh Babak N. Araabi Control and Intelligent Processing Center of Excellence Electrical and Computer Engineering Department University of Tehran Tehran Iran

This paper is based our previous work on model predictive control (MPC) of switched reluctance motor (SRM). A local linear neuro-fuzzy model is used to model SRM. Then a MPC schema is devised considering an appropriate energy term in the objective function during optimization phase. Commutation occurs naturally as an outcome of the predictive control design process, not as an extra step added to the control policy. In this paper, an adaptive -time varying- objective function is proposed to better cope with nonlinear nature of the SRM. A fast and easy algorithm is devised to adjust the weights in the objective function. This new algorithm allow for an auto-tune MPC approach to SRM control. From a computational view point, we use locally linear model predictive control that with a quadratic cost and linear constraints reduces to a simple quadratic programming, which can be solved very fast in a closed form. Simulation studies justify applicability of our proposed method and algorithm to SRM applications

关键词： Predictive control Reluctance motors Predictive models Magnetic materials Photonic crystals Reluctance machines Commutation Costs Strontium Power system modeling

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electrical stimuli capsule for control moving direction at the small intestine

Electrical stimuli capsule for control moving direction at t...

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4th IASTED International Conference on Biomedical engineering

作者： Woo, S.H. Jang, J.Y. Jung, E.S. Lee, J.H. Moon, Y.K. Kim, T.W. Won, C.H. Choi, H.C. Cho, J.H. School of Electronic Engineering and Computer Science Kyungpook National University College of Veterinary Medicine Dept. of Physiology Kynugpook National University Department of Computer Control and Electrical Engineering Kyungil University Advanced Research Center for Recovery of Human Sensibility Kyungpook National University Engineering Building 10 Kyungpook National University 1370 Sankyuk-dong Buk-gu Daegu 702-701 Korea Republic of

ISBN: (纸本)0889865787

Recently, a capsule endoscope has been developed to observe images from the inside of intestine. Such a capsule endoscope does not have locomotion or hold method. To get proper diagnosis and medication, it is necessary to control the capsule from outside to guide locomotion. The designed and implemented capsule has feasibility to contract the small intestine by electrical stimuli through the electrodes. When the small intestine is contracted by electrical stimuli, the capsule can move to opposite direction, which means the capsule can go up and down in the small intestine. The implemented stimuli capsule always monitors excessive energy transmission and automatically shuts down the electrical stimuli to make it more secure. Additionally, the stimuli capsule goes on standby mode to save the battery, and it can be reset by comparator circuit which is connected to stimulus electrodes. To verify the design and implement the stimuli capsule, in-vitro experiments were performed with pig's small intestine.

关键词： Biomedical engineering

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Design and implementation of the telemetry capsule for measuring of electrogastrography

Design and implementation of the telemetry capsule for measu...

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4th IASTED International Conference on Biomedical engineering

作者： Jung, E.S. Lee, J.H. Woo, S.H. Yoon, K.W. Jang, J.H. Kim, M.K. Moon, Y.K. Kim, T.W. Won, C.H. Choi, H.C. Cho, J.H. School of Electronic Engineering and Computer Science Kyungpook National University College of Veterinary Medicine Dept. of Physiology Kynugpook National University Department of Computer Control and Electrical Engineering Kyungil University Advanced Research Center for Recovery of Human Sensibility Kyungpook National University Engineering Building 10 Kyungpook National University 1370 Sankyuk-dong Buk-gu Daegu 702-701 Korea Republic of

ISBN: (纸本)0889865787

Electrogastrography (EGG) is a significant reference of the myoelectric activity of the gastrointestinal tract and indicates whether it has a disease or not. There have been numerous studies of the myoelectric activity in a stomach, but only a few studies of the intestines because of the difficulty of measurement in the intestines. Recently, the technology of the biotelemetry capsule for measurement of internal information in the human digestive tract has been developed. In the current study, an EGG telemetry system using the developed biotelemetry technology was designed and implemented for measuring EGG in intestines. The EGG capsule converts the acquired EGG value to digital data, which is transmitted from the capsule to the external receiver. The performance of the telemetry capsule for the EGG monitoring in the gastrointestinal tract was verified by in-vitro animal experiments. From the experiment, it was verified that the EGG telemetry capsule can measures a slow wave in intestines.

关键词： Biomedical engineering

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FuFaIR: a Fuzzy Farsi Information Retrieval System

FuFaIR: a Fuzzy Farsi Information Retrieval System

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ACS/IEEE International Conference on computer Systems and Applications

作者： A. Nayyeri F. Oroumchian Department of Electrical & Computer Engineering University of Tehran Iran Control and Intelligent Processing Center of Excellence Faculty of Engineering University of Tehran Iran

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Quantum key distribution based on a Sagnac loop interferometer and polarization-insensitive phase modulators

Quantum key distribution based on a Sagnac loop interferomet...

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IEEE International Symposium on Information Theory

作者： Bing Qi Lei-lei Huang Hoi-kwong Lo Li Qian Center for Quantum Information and Quantum Control Department of Physics and Department of Electrical and Computer Engineering University of Toronto Toronto Canada

We present a design for a quantum key distribution (QKD) system in a Sagnac loop configuration, employing a novel phase modulation scheme based on frequency shift, and demonstrate stable BB84 QKD operation with high interference visibility and low quantum bit error rate (QBER). The phase modulation is achieved by sending two light pulses with a fixed time delay (or a fixed optical path delay) through a frequency shift element and by modulating the amount of frequency shift. The relative phase between two light pulses upon leaving the frequency-shift element is determined by both the time delay (or the optical path delay) and the frequency shift, and can therefore be controlled by varying the amount of frequency shift. To demonstrate its operation, we used an acousto-optic modulator (AOM) as the frequency-shift element, and vary the driving frequency of the AOM to encode phase information. The interference visibility for a 40 km and a 10 km fiber loop is 96% and 99%, respectively, at single photon level. We ran BB84 protocol in a 40-km Sagnac loop setup continuously for one hour and the measured QBER remained within the 2%-5% range. A further advantage of our scheme is that both phase and amplitude modulation can be achieved simultaneously by frequency and amplitude modulation of the AOM's driving signal, allowing our QKD system the capability of implementing other protocols, such as the decoy-state QKD and the continuous-variable QKD. We also briefly discuss a new type of Eavesdropping strategy ("phase-remapping" attack) in bidirectional QKD system

关键词： Sagnac interferometers Polarization Phase modulation Frequency Delay effects Optical modulation Interference Optical pulses Pulse modulation Optical interferometry

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Sagnac quantum key distribution using novel polarization-insensitive phase modulators based on frequency shift

Sagnac quantum key distribution using novel polarization-ins...

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LEOS Summer Topical Meetings

作者： Lei-Lei Huang Bing Qi R. Mong Li Qian Hoi-Kwong Lo Department of Electrical and Computer Engineering and Department of Physics Center for Quantum Information and Quantum Control University of Toronto Toronto Canada

We demonstrate a stable Sagnac quantum key distribution implementing BB84 phase-encoding protocol based on acousto-optic frequency shifters. The quantum bit error rate remains 4-6.5% for at least one hour without reca... 详细信息

关键词： Sagnac interferometers Phase modulation Frequency shift keying Pulse modulation Optical pulse generation Optical fiber polarization Quantum computing Protocols Interference Optical control

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Piecewise Linear Model Tree: A modified combination of two learning algorithms for neuro-fuzzy models

Piecewise Linear Model Tree: A modified combination of two l...

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IEEE International Conference on computer-Aided Design

作者： Atiye Sarabi Jamab Babak N. Araabi Electrical Engineering Department Malek Ashtar University of Technology Tehran Iran Control & Intelligent Processing Center of Excellence Electrical and Computer Engineering Department University of Tehran Tehran Iran

Locally Linear Model Tree (LOLIMOT) and Piecewise Linear Network (PLN) learning algorithms are two approaches in local linear modeling use different algorithm in each part of training phase. PLN learning is more depended on training data than LOIMOT and needs rich training data set. In PLN learning no division test is needed and it causes this algorithm to be much faster than LOLIMOT, but it may create adjacent neurons that would lead to singularity in regression matrix. In LOLIMOT, because of regular splitting of input space, this problem does not occur and always it leads to acceptable output error, but needs large number of neuron. Therefore, PILIMOT learning algorithm is introduced as modified combination of these two main Locally Linear approaches. This new method takes suitable error and neuron number from both of algorithms and leads to efficient network which is applicable to identify all functions. Simulation results show the advantage and behavior of new method.

关键词： Piecewise linear techniques Function approximation Neurons Partitioning algorithms Neural networks Approximation algorithms Piecewise linear approximation Radial basis function networks Training data Artificial neural networks

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A control-design-based solution to robotic ecology: Autonomy of achieving cooperative behavior from a high-level astronaut command

A control-design-based solution to robotic ecology: Autonomy...

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作者： Wang, Jing Qu, Zhihua Ihlefeld, Curtis M. Hull, Richard A. Department of Electrical and Computer Engineering University of Central Florida Orlando FL 32816 United States Kennedy Space Center FL 32899 United States Lockheed Martin Missiles and Fire Control 5600 Sand Lake Rd. MP-450 Orlando FL 32819 United States School of Electrical and Computer Science University of Central Florida IEEE AIAA University of Central Florida Department of Electrical and Computer Engineering National Aeronautics and Space Administration Kennedy Space CenterKennedy Space Center Applied Physics Lab. Advanced Concepts Business Unit Science Applications International Corporation SAIC IEEE Control System Society

In this paper, we propose a cooperative control strategy for a group of robotic vehicles to achieve the specified task issued from a high-level astronaut command. The problem is mathematically formulated as designing the cooperative control for a general class of multiple-input-multiple-output (MIMO) dynamical systems in canonical form with arbitrary but finite relative degrees such that the outputs of the overall system converge to the explicitly given steady state. The proposed cooperative control for individual vehicle only need to use the sensed and communicated outputs information from its local neighboring vehicles. No fixed leader and time-invariant communication networks are assumed among vehicles. Particularly, a set of less-restrictive conditions on the connectivity of the sensor/communication networks are established, under which it is rigorously proven by using the newly found nice properties of the convergence of sequences of row stochastic matrices that the cooperative objective of the overall system can be achieved. Simulation results for a group of vehicles achieving a target and surrounding a specified object in formation are provided to support the proposed approach in this paper.

关键词： Robotics

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On stability of switched linear systems with perturbed switching paths

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控制理论与应用（英文版） 2006年第1期4卷 18-25页

作者： Zhendong SUN Shuzhi S. GE Center for Control and Optimization South China University of Technology Guangzhou Guangdong 510641 China Department of Electrical and Computer Engineering National University of Singapore 117576 Singapore

This paper addresses the stability issue of switched linear systems with perturbed switching paths. First, by introducing the notions of child-path and parent-path, we are able to define the distance between two switching paths by means of their switching matrices chains. Next, we present the nice properties of the defined distance. Then, a stability criterion is presented for a class of switched linear systems with perturbed switching paths. Finally, an illustrative example is presented to verify the effectiveness of the approach.

关键词： Switched systems Switching path Consistent convergency Switching distance

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