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International Conference on Telecommunications Energy (INTELEC)

作者： Sang-Taek Lee Hee-Jun Kim Dae-Kyong Kim Kwang-Woon Lee Dept. of Electronics Electrical Control and Instrumentation Engineering Hanyang Univ. Korea Digital Convergence Center Korea Electronics Technology Institute Korea School of Electrical Engineering and Computer Science Hanyang Univ. Korea Division of Maritime Electronics and Communication Engineering Mokpo National Maritime Univ. Korea

ISBN: (纸本)9781424424900

This paper presents a novel load variation compensation algorithm in a sensor-less BLDC motor drive for a reciprocating compressor. Periodic load variation of a reciprocating compressor leads to commutation position error and instantaneous speed variation and causes large peak currents. The major concept of this study includes tracking the pattern of load torque and controlling the motor input voltage by the commutation point and PWM depending on the tracked load torque. The suggested method can reduce the cost because this method does not require additional current sensing or voltage comparison circuit. The utility of the suggested algorithm was confirmed by simulation and experimental results of a sensor-less BLDC motor drive.

关键词： Load management Brushless DC motors Torque Commutation Pistons Voltage control Refrigeration Rotors Home appliances Force control

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Learning algorithm and application of quantum BP neural networks based on universal quantum gates

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Journal of Systems engineering and Electronics 2008年第1期19卷 167-174页

作者： Li Panchi Li Shiyong Dept. of Control Science and Engineering Harbin Inst. of Technology Harbin 150001 P. R. China Dept. of Computer Science and Engineering Daqing Petroleum Inst. Daqing 163318 P. R. China

A quantum BP neural networks model with learning algorithm is proposed. First, based on the universality of single qubit rotation gate and two-qubit controlled-NOT gate, a quantum neuron model is constructed, which is composed of input, phase rotation, aggregation, reversal rotation and output. In this model, the input is described by qubits, and the output is given by the probability of the state in which （1） is observed. The phase rotation and the reversal rotation are performed by the universal quantum gates. Secondly, the quantum BP neural networks model is constructed, in which the output layer and the hide layer are quantum neurons. With the application of the gradient descent algorithm, a learning algorithm of the model is proposed, and the continuity of the model is proved. It is shown that this model and algorithm are superior to the conventional BP networks in three aspects： convergence speed, convergence rate and robustness, by two application examples of pattern recognition and function approximation.

关键词： quantum computing universal quantum gate quantum neuron quantum neural networks

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Grover quantum searching algorithm based on weighted targets

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Journal of Systems engineering and Electronics 2008年第2期19卷 363-369页

The current Grover quantum searching algorithm cannot identify the difference in importance of the search targets when it is applied to an unsorted quantum database, and the probability for each search target is equal. To solve this problem, a Grover searching algorithm based on weighted targets is proposed. First, each target is endowed a weight coefficient according to its importance. Applying these different weight coefficients, the targets are represented as quantum superposition states. Second, the novel Grover searching algorithm based on the quantum superposition of the weighted targets is constructed. Using this algorithm, the probability of getting each target can be approximated to the corresponding weight coefficient, which shows the flexibility of this algorithm. Finally, the validity of the algorithm is proved by a simple searching example.

关键词： Grover algorithm targets weighting quantum searching quantum computing.

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The servomechanism problem for SISO positive LTI systems

Lecture Notes in Control and Information Sciences

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Lecture Notes in control and Information Sciences 2008年 371卷 181-193页

作者： Roszak, Bartek Davison, Edward Systems Control Group Dept. of Electrical and Computer Engineering University of Toronto Toronto Ont. M5S 1A4 Canada

ISBN: (纸本)9781848001541

In this paper, we study the servomechanism problem for positive LTI systems. In particular, we consider the robust servomechanism problem of nonnegative constant reference signals for stable SISO positive LTI systems with constant disturbances, for the case when the plant model of the system is not known. A positive LTI system is an LTI system with the imposed constraint that the state, output and/or input variables be nonnegative for all time. This type of constraint is quite natural to apply, since the property of nonnegativity occurs quite frequently in practical applications and in nature, e.g. in pharmacodynamic applications, infusion of vasoactive drugs, chemical systems. A special class of positive systems that is of significant importance and appears quite frequently in the literature is the class of compartmental systems;these systems are composed of a finite number of storage devices or reservoirs and model various gas, fluid, and solid exchange networks. Positive systems have been of great interest to numerous researchers over several decades. Interesting results obtained on positive systems span the topics of reachability and controllability, realization theory for positive systems, stability control, and control via pole-assignment. However, to date, there appears that no study has been carried out on the servomechanism problem for positive LTI systems;thus we focus our attention on this topic in the paper. Various applications of the results are applied to a number of positive system problems obtained from the literature. © 2008 Springer London.

关键词： Linear systems

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Performance of MISO time reversal ultra-wideband over an 802.15.3a channel model

Performance of MISO time reversal ultra-wideband over an 802...

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2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications, ISSSTA2008

作者： Angélico, Bruno A. Burt, Phillip M. S. Jeszensky, Paul Jean E. Hodgkiss, William S. Abrão, Taufik Dept. of Telecommunications and Control Engineering Escola Politécnica of the University of São Paulo Brazil Dept. of Electrical and Computer Engineering University of California San Diego United States Dept. of Electrical Engineering State University of Londrina Brazil

ISBN: (纸本)9781424422043

This paper analyzes the performance of a baseband multiple-input single-output (MISO) time reversal ultra-wideband system (TR-UWB) over the IEEE 802.15.3a channel model. Two scenarios are considered, CM1 based on LOS (0-4m) channel measurements and ("VI3 based on NLOS (4-10m) channel measurements. A semi-analytical performance expression is derived and compared with simulation results in terms of the number of antenna elements, number of users, and transmission rate. The results show that the system performance is improved with an increase in the number of transmit antenna elements and that additional equalization and multiple access enhancement schemes are necessary for high transmission rates. © 2008 IEEE.

关键词： Antennas

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Improvement of MISO single-user time reversal ultra-wideband using a DFE channel equalizer

Improvement of MISO single-user time reversal ultra-wideband...

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2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications, ISSSTA2008

作者： Angelico, Bruno A. Burt, Phillip M. S. Jeszensky, Paul Jean E. Hodgkiss, William S. Abrão, Taufik Dept. of Telecommunications and Control Engineering Escola Politécnica of the University of São Paulo Brazil Dept. of Electrical and Computer Engineering University of California San Diego United States Dept. of Electrical Engineering State University of Londrina Brazil

ISBN: (纸本)9781424422043

In this paper a baseband multiple-input single-output (MISO) time reversal ultra-wideband system (TR-UWB) incorporating a decision feedback equalizer (DFE) is evaluated over the scenarios CM1 and CM3 of the IEEE 802.15.3a channel model. A semi-analytical performance based on a Gaussian approximation is derived and compared with simulation results. The results show that such approach represents a good approximation for the bit error rate (HER) analysis, and that the DFE, as well as an increase in the number of transmit antennas, improve the system performance. © 2008 IEEE.

关键词： Decision feedback equalizers

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Robust reliable guaranteed cost control for nonlinear singular stochastic systems with time delay

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Journal of Systems engineering and Electronics 2008年第4期19卷 791-798页

作者： Zhang Aiqing Fang Huajing Dept. of Control Science and Engineering Huazhong Univ. of Science and Technology Wuhan 430074 P. R. China Coll. of Mathematics and Computer Science Jianghan Univ. Wuhan 430056 P. R. China

To study the design problem of robust reliable guaranteed cost controller for nonlinear singular stochastic systems, the Takagi-Sugeno （T-S） fuzzy model is used to represent a nonlinear singular stochastic system with norm-bounded parameter uncertainties and time delay. Based on the linear matrix inequality （LMI） techniques and stability theory of stochastic differential equations, a stochastic Lyapunov function method is adopted to design a state feedback fuzzy controller. The resulting closed-loop fuzzy system is robustly reliable stochastically stable, and the corresponding quadratic cost function is guaranteed to be no more than a certain upper bound for all admissible uncertainties, as well as different actuator fault cases. A sufficient condition of existence and design method of robust reliable guaranteed cost controller is presented. Finally, a numerical simulation is given to illustrate the effectiveness of the proposed method.

关键词： fuzzy control reliable control LMI singular systems stochastic stability

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Verification of Markov models of ageing power equipment

Verification of Markov models of ageing power equipment

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10th International Conference on Probabilistic Methods Applied to Power Systems, PMAPS 2008

作者： Sugier, Jaroslaw Anders, George Inst. of Computer Engineering Control and Robotics Wroclaw University of Technology Poland Dept. of Microelectronics of the Technical University of Lodz Poland

ISBN: (纸本)9781934325216

Markov models are a well established technique widely used for modeling deterioration processes of the electric power equipment and in reliability analysis. Recently, several papers using Markov and semi-Markov models have been published addressing the issue of the calculation of the rlife, future failure rates and the probability of failure of power equipment. This paper focuses on one such model and addresses an issue of accuracy of Markov model analysis. The paper presents a method of model adjustment and discusses implementation of three numerical algorithms solving the problem of parameter approximation. A practical example confirms validity of the approach and illustrates its efficiency.

关键词： Reliability analysis

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Contourlet Based Interest Points Detector

Contourlet Based Interest Points Detector

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20th IEEE International Conference on Tools with Artificial Intelligence

作者： Saydam, Samer R. El rube', Ibrahim A. Shoukry, Amin A. CS Department Computing and Information Technology College AASTMT Egypt EC Eng. Dept. College of Engineering and Technology AASTMT Egypt Computer Science and Automatic Control Department Faculty of Engineering Alexandria University Egypt

ISBN: (纸本)9780769534404

This paper proposes a robust algorithm for detecting interest points based on the NonsubSampled Contourlet Transform (NSCT). The NSCT provides multiscale decomposition with directional filters at each scale. Furthermore, NSCT is very efficient in extracting the geometric information of images and therefore it has very good feature localization. The NSCT-based point detector is compared to the widely used Harris and Difference of Gaussian (DoG) interest point detectors. The experimental results reveal the robustness of the proposed algorithm to rotation, scale and viewpoint changes.

关键词： Interest point detection corner detector local features nonsubsampled contourlet transform (NSCT)

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A new method to thermally manage an electronic control unit while reducing radiated emissions

A new method to thermally manage an electronic control unit ...

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2008 IEEE International 51st Midwest Symposium on Circuits and Systems, MWSCAS

作者： Sharaa, Imad Aloi, Daniel N. Powertrain Control Electronics Visteon Van Buren Township MI United States Electrical and Computer Engineering Dept. Oakland University Rochester MI United States

ISBN: (纸本)9781424421671

This paper provides a methodology to thermally manage an electronic control unit while reducing its radiated emissions. Measurements of the radiated emission levels for a particular electronic control unit revealed excessive levels. Electronic control units utilize pulse width modulated signals to control an external load. The rise and fall times of the pulse width modulated signal impact both the radiated emissions and the thermal behavior of the electronic control unit. The method proposed in this paper establishes a generalized relationship between the rise and fall times of the electronic control unit's pulse width modulated signals to its associated radiated emission levels and thermal behavior. ©2008 IEEE.

关键词： Servomechanisms

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