检索结果-内蒙古大学图书馆

Authors' Reply to Comments on “Variable-Structure PID control to Prevent Integrator Windup”

IEEE Transactions on Industrial Electronics 2004年第3期51卷 738-739页

作者： Scottedward Hodel, A. Hall, Charles E. Department of Electrical and Computer Engineering Auburn University Auburn AL 36849-5201 United States Control Systems Group NASA Marshall Space Flight Center Huntsville AL 35812 United States

For comments by R.J. Mantz and H. De Battisa see ibid. (vol. 51, p. 736-38, June 2004) . For original paper by A. S. Hodel and C. E. Hall see ibid.(vol. 48, p. 442-51, Apr. 2001).

关键词： control systems design methodology

来源：评论

学校读者我要写书评

暂无评论

A hierarchical tissue segmentation approach in brain MRI images

A hierarchical tissue segmentation approach in brain MRI ima...

引用

Image Processing, Biomedicine, Multimedia, Financial engineering and Manufacturing - International Forum on Multimedia Image Processing, IFMIP - Sixth Biannual World Automation Congress, WAC 2004

作者： Song, Tao Huang, Mingxiong Lee, Roland R. Gasparovic, Charles Jamshidi, Mo University of New Mexico Albuquerque NM United States Electrical and Computer Engineering Department University of New Mexico Autonomous Control Engineering Center University of New Mexico Radiology Department University of New Mexico New Mexico VA Health Care System MIND Imaging Center University of New Mexico Health Science Center

ISBN: (纸本)188933524X

Magnetic resonance imaging (MRI) is a widely used approach to obtaining high quality medical images of the brain. Post-processing MRI images with segmentation algorithms enhances the visualization and measurement of soft tissues and lesions. Segmented brain images contain information amenable to quantitative analysis (e.g., tissue component percentage in a region of interest (ROI)) and diagnostic interpretation (e.g., total lesion volume). A number of different segmentation algorithms have been developed for this purpose. In this paper, we propose a novel automated segmentation technique, hierarchical structure weighted probabilistic neural network (HSWPNN), based on multi-scale feature extraction, hierarchical labeling structure, and a modified weighted probabilistic neural network (PNN). Compared to other clustering algorithms, our method is relatively robust to noise and accurate. We compare our results to a model of ground truth.

关键词： Magnetic resonance imaging

来源：评论

学校读者我要写书评

暂无评论

Multispectral landsat image classification using fuzzy expert systems

Multispectral landsat image classification using fuzzy exper...

引用

Proceedings of the Biannual World Automation Congress

作者： Van Wang Mo Jamshidi Electrical and Computer Engineering Department and Autonomous Control Engineering Center University of New Mexico Albuquerque NM USA

A hierarchical fuzzy expert system is proposed for multispectral Landsat image classification to overcome difficulties with conventional maximum-likelihood classifier (MLC) based on normal distribution and easily incorporate other collateral data, such as vegetation index, digital elevation model, etc. The hierarchical structure is to reduce fuzzy rules to incorporate as many useful data sources as possible. Adaptive-Neural-Network Based Fuzzy Inference System (ANFIS) is used to build up fuzzy rule based systems to adapt training data. The expert system is tested for the classification on Landsat 7 ETM+ image and results are effective for multispectral image classification.

关键词： Satellites Remote sensing Image classification Hybrid intelligent systems Training data Fuzzy systems Humans Image analysis control engineering Fuzzy logic

来源：评论

学校读者我要写书评

暂无评论

On designing a reduced-order fuzzy observer

On designing a reduced-order fuzzy observer

引用

8th Pacific Rim International Conference on Artificial Intelligence, PRICAI 2004: Trends in Artificial Intelligence

作者： Moshiri, Behzad Besharati, Farhad Tafti, Abdrreza Dehghani Bitaghsir, Ali Akhavan Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran P.O. Box 14395/515 Tehran Iran Islamic Azad University Science and Research Branch Tehran Iran

In this paper, a method for designing reduced-order fuzzy observers for systems expressed in Takagi-Sugeno fuzzy model is proposed. © Springer-Verlag Berlin Heidelberg 2004.

ISBN: (纸本)3540228179

In this paper, a method for designing reduced-order fuzzy observers for systems expressed in Takagi-Sugeno fuzzy model is proposed. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Fuzzy sets

来源：评论

学校读者我要写书评

暂无评论

A novel low chattering sliding mode controller

A novel low chattering sliding mode controller

引用

Asian control Conference

作者： M.R. Rafimanzelat M.J. Yazdanpanah Control & Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran Iran

The purpose of this paper is to design a high performance sliding mode controller through the use of a new switching function. This method uses the idea of boundary layer sliding mode while taking the boundary layer width as a function of the angle between the state trajectory and the sliding surface which we call approach angle. By incorporating the approach angle into the switching function, the overall sliding mode controller guarantees the asymptotical stability of the system while having only a slight amount of chattering. This method overcomes the shortcomings of a pure discontinuous switching such as excessive chattering, while maintaining its benefit that is the asymptotical stability is guaranteed. The proposed method is used to control an inverted pendulum. It is also compared with a pure switching function. Simulation results show that the new sliding mode controller has good control performance with negligible chattering.

关键词： Sliding mode control Asymptotic stability control systems Closed loop systems Robust control Linear approximation Piecewise linear approximation Robustness Intelligent control control system synthesis

来源：评论

学校读者我要写书评

暂无评论

Sensorless speed control of induction motor derives using a robust and adaptive neuro-fuzzy based intelligent controller

Sensorless speed control of induction motor derives using a ...

引用

IEEE International Conference on Industrial Technology (ICIT)

作者： F. Rashidi Center of Excellence for Control and Intelligent Processing Department of Electrical and Computer Engineering University of Tehran Iran

In this paper a novel sensorless adaptive neurofuzzy speed controller for induction motor derives is formulated. An artificial neural network (ANN) is adopted to estimate the motor speed and thus provide a sensorless speed estimator system. The performance of the proposed adaptive neurofuzzy speed controller is evaluated for a wide range of operating conditions for induction motor. These include startup, step changes in reference speed, unknown load torque and parameters variations. Obtained results show that the proposed ANN provides a very satisfactory speed estimation under the above mentioned operation conditions and also the sensorless adaptive neurofuzzy speed controller can achieve very robust and satisfactory performance and could be used to get the desired performance levels. The response time is also very fast despite the fact that the control strategy is based on bounded rationality.

关键词： Velocity control Induction motors Robust control Programmable control Adaptive control Intelligent sensors Sensorless control Artificial neural networks Artificial intelligence Torque

来源：评论

学校读者我要写书评

暂无评论

Power system transient stabilization and voltage regulation based on simple neuron structure

Power system transient stabilization and voltage regulation ...

引用

International Conference on Mechatronics (ICM)

作者： R. Mohammadi-Milasi P. Jabehdar-Maralani Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran Iran

A global power system transient stabilizer and voltage regulator based on a simple neuron structure is proposed in this paper. Two independent controllers i.e. transient controller and voltage regulator are designed. To this end, a simple structure controller that consists of only one neuron is used. The proposed neuro-controller does not need any offline training and the parameters can be determined on-line. To achieve the global control action that guarantees both transient stability and voltage regulation, we used a membership function that was a function of measurable parameters of the system. The proposed global control law acts in a manner in which in the transient period, the transient stabilizer is the dominant controller and in the post transient period, the voltage controller is the dominant one. The effectiveness of the proposed global control action is demonstrated through some computer simulations on a single machine infinite-bus (SMIB) power system.

关键词： Power system transients Voltage control Neurons Regulators control systems Stability computer simulation Power system simulation Power system control Power systems

来源：评论

学校读者我要写书评

暂无评论

A new approach to commutation in predictive control of switch reluctance motor

A new approach to commutation in predictive control of switc...

引用

IEEE International Conference on Industrial Technology (ICIT)

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

This paper provides a model predictive approach to control switched reluctance motors (SRM's). A local linear neuro-fuzzy model is used to model SRM. Then a predictive control schema is devised considering an appropriate energy term in the optimization phase. Commutation occurs naturally as an outcome of the predictive control design process, not as an extra step added to the control policy. 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 program, which can be solved very fast in a closed form. Simulation studies justify applicability of our proposed method to SRM applications.

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

来源：评论

学校读者我要写书评

暂无评论

Robust H/sub /spl infin// congestion control in differentiated services networks

Robust H/sub /spl infin// congestion control in differentiat...

引用

International Conference on Information and Communication Technologies: From Theory to Applications, ICTTA

作者： M. Jalili-Kharaajoo Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran Tehran Iran

A robust active queue management system is designed to secure high utilization, bounded delay and loss, while the network complies with the demands each traffic class sets. To this end, we use the H/sub /spl infin// control theory. Simulation results of the proposed control action demonstrate the effectiveness of the controller in providing robust queue management system.

关键词： Robust control Intelligent networks Diffserv networks Internet TCPIP Communication system traffic control Traffic control Protocols IP networks Streaming media

来源：评论

学校读者我要写书评

暂无评论

An experimental study of subsonic cavity flow - physical understanding and control

An experimental study of subsonic cavity flow - physical und...

引用

2nd AIAA Flow control Conference 2004

作者： Debiasi, M. Yan, P. Little, J. Özbay, H. Myatt, J. Samimy, M. Gas Dynamics and Turbulence Laboratory Collaborative Center of Control Science The Ohio State University GDTL/AARL2300 West Case Road Columbus OH 43235 United States Department of Mechanical Engineering United States Department of Electrical and Computer Engineering United States Air Force Research Laboratory United States

ISBN: (纸本)9781624100307

We present the results of an experimental investigation that uses two different techniques for controlling a shallow cavity flow in the Mach number range 0.25-0.5. The first method is basically an open-loop design that relies on zero-net-mass forcing at an optimal frequency for suppressing the cavity flow resonance. The second method is a parallel-proportional with time delay controller, a linear control design that relies on real-time feedback from the flow to counteract the resonance. With properly tuned parameters, both methods are successful in reducing the cavity resonance for flows in the Mach number range explored. However the parallel-proportional controller exhibits a superior robustness with respect to departure of the Mach number from the design conditions, a signature of feedback control designs that are naturally more capable to handle changes of the open-loop plant. An additional benefit of the feedback control method is the lower power requirement to achieve comparable suppression of the resonance. An interpretation is presented of the physical mechanisms by which the optimal forcing frequency and the parallel-proportional with time delay controller reduce the cavity flow resonance. The results support the idea that the optimal forcing frequency control induces in the system a rapid switching between modes competing for the available energy that can be extracted from the mean flow. In the case of parallel- proportional control mode switching is also observed which involves a larger range of frequencies and spreads more the extracted energy thus producing a flow with a quieter, more broadband spectral signature.

关键词： Mach number

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：