检索结果-内蒙古大学图书馆

19th International Conference on Adaptive Structures and Technologies 2008, ICAST 2008

作者： Aphale, Sumeet S. Fleming, Andrew J. Moheimani, S.O.R. University of Aberdeen Kings College United Kingdom ARC Center of Excellence for Complex Dynamic Systems and Control University of Newcastle Callaghan Australia School of Electrical Engineering and Computer Science University of Newcastle CallaghanNSW Australia

ISBN: (纸本)9781617389870

This paper presents a simple second-order controller that damps the resonance typical of piezoelectric nanopositioners and delivers good tracking performance. This method employs the Integral Resonant control scheme (IRC) for damping the dominant resonant mode of the piezoelectric nanopositioner and uses an integral controller to achieve tracking performance. As disturbance rejection is a main concern in nanopositioning applications, the control scheme is tested for its disturbance rejection performance. It is seen that the control scheme has good disturbance rejection characteristics deeming it suitable for nanopositioning applications. To test the tracking performance, the system is made to track a 20 Hz triangular input at various integral gains. It is shown that improved tracking performance can be achieved at high gains with only a slight degradation in disturbance rejection performance at high frequencies.

关键词： Disturbance rejection

来源：评论

学校读者我要写书评

暂无评论

Performance-aware power management in embedded controllers with multiple-voltage processors

引用

Information Technology Journal 2008年第6期7卷 942-947页

作者： Xia, Feng Liu, Liping Ma, Longhua Sun, Youxian Dong, Jinxiang College of Computer Science and Technology Zhejiang University Hangzhou 310027 China School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China State Key Lab of Industrial Control Technology Zhejiang University Hangzhou 310027 China Faculty of Information Technology Queensland University of Technology Brisbane QLD 4001 Australia

The aim of this research is to minimize the energy dissipation of embedded controllers without jeopardizing the Quality of control (QoC). Taking advantage of the Dynamic Voltage Scaling (DVS) technology, this study develops a performance-aware power management scheme for embedded controllers with processors that allow multiple voltage levels. The periods of control tasks are adapted online with respect to the current QoC, thus facilitating additional energy reduction over standard DVS. To avoid the waste of CPU resources as a result of the discrete voltage levels, a resource reclaiming mechanism is employed to maximize the CPU utilization and also to improve the QoC Simulations are conducted to evaluate the performance of the proposed scheme. Compared with the optimal standard DVS scheme, the proposed scheme is shown to be able to save remarkably more energy while maintaining comparable QoC. © 2008 Asian Network for Scientific Information.

关键词： Real time control

来源：评论

学校读者我要写书评

暂无评论

Model of cerebellum for control of human upright balance

引用

Tien Tzu Hsueh Pao/Acta Electronica Sinica 2008年第11期36卷 2132-2138+2143页

作者： Zhang, Shao-Bai Ruan, Xiao-Gang Cheng, Xie-Feng Feng, Zhi-Quan College of Electronic Information and Control Engineering Beijing University of Technology Beijing 100022 China College of Computer Nanjing University of Posts and Telecommunications Nanjing 210003 China School of Information Science and Engineering Jinan University Jinan 250022 China

The paper presents a model of cerebellum with long-loop force feedback and gains scheduling so as to demonstrate the control of human upright balance. The model consists mostly of two parts, i.e. cerebrum and cerebellum. The cerebellar component of the controller is represented by two sets of gains that provide linear scaling of same-joint and interjoint long-loop stretch responses between ankle, knee and kip. Whereas the cerebral component of the model composes a single set of same-joint liner force feedback gains. The paper, however, proposes that the cerebellum switches control gain sets as a function of sensing human body kinematics state. By means of simulation, the model illustrates that stabilized hybrid long-loop feedback with scheduling of linear gains may afford realistic balance control in the absence of explicit internal dynamics models and suggests that the cerebellum and cerebral cortex may contribute to the balance control via such mechanism.

关键词： Scheduling

来源：评论

学校读者我要写书评

暂无评论

Adaptive Digital Video Transmission in MIMO Systems

Adaptive Digital Video Transmission in MIMO Systems

引用

International Symposium on Intelligent Information Technology Application, IITA

作者： Jia-Chyi Wu Chi-Min Li Kuo-Hsean Chen Department of Communications Navigation and Control Engineering College of Electrical Engineering and Computer Science National Taiwan Ocean University Keelung Taiwan

Under limited channel capacity condition, this study investigates a combined source and channel coding algorithm providing a uniform video transmission rate to achieve better system performance in wireless MIMO systems. In the proposed algorithm, we applied MPEG2 video source coding scheme with convolutional channel coding as well as space-time block coding techniques, associated with BPSK/QPSK modulation method, to improve video transmission performance. The proposed algorithm assigned rates to MPEG2 source code and convolutional channel code, combined with space-time block coding schemes based upon the feedback information from performance control unit (PCU) under channel capacity limitation, which ensures the given system can achieve better performance compared to a conventional system.

关键词： MIMO Channel capacity Channel coding Convolutional codes Block codes System performance Source coding Binary phase shift keying Quadrature phase shift keying Modulation coding

来源：评论

学校读者我要写书评

暂无评论

Clustering and scheduling algorithm based on task duplication

引用

Jisuanji Xuebao/Chinese Journal of computers 2008年第5期31卷 733-740页

作者： He, Kun Zhao, Yong Huang, Wen-Qi College of Computer Science and Technology Huazhong Univ. of Sci. and Technol. Wuhan 430074 China Department of Control Science and Engineering Huazhong Univ. of Sci. and Technol. Wuhan 430074 China

This paper addresses an important and classic scheduling problem, the static scheduling of dependent tasks in homogeneous environment. It is NP hard even when the resources are unbounded, and finds many applications in the parallel and distributed computation area. Dependent tasks are usually denoted by Directed Acyclic Graph (DAG), and solving heuristics are commonly categorized to priority list based, cluster based and task duplication based schemes. Task-duplication-based (TDB) algorithms are of better performance than non-duplication ones. A new TDB clustering and scheduling algorithm, called the dynamic critical predecessor (DCP) algorithm, is proposed in this paper. DCP algorithm defines a new selective strategy for important ancestors to be duplicated. The primary aim is to get the shortest schedule length, and the next is to utilize as less resources as possible. Based on an improved definition of granularity, DCP algorithm achieves a better performance guarantee for arbitrary DAG than relative works reported in the literature. Experimental results on several benchmarks show that DCP algorithm is quite effective and it exceeds other classic TDB algorithms. Especially for the classic EZ benchmark, DCP algorithm gets an optimal solution with 8 makespan, which is better than the optimal result taken for before with 8.5 makespan. Complement graph of a DAG is defined, and a similar algorithm is developed to produce a 2-optimal schedule for tree graph if task duplication is not allowed for the tasks.

关键词： Scheduling algorithms

来源：评论

学校读者我要写书评

暂无评论

Robust H∞ reliable control for uncertain singular stochastic fuzzy systems

Robust H∞ reliable control for uncertain singular stochasti...

引用

IEEE International Conference on Automation and Logistics

作者： Aiqing Zhang Huajing Fang College of Mathematics and Computer Science Jianghan University Wuhan Hubei China Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan Hubei China

This paper is concerned with the design problem of robust H infin reliable controller for nonlinear singular stochastic systems with actuator failures via a fuzzy-control approach. The Takagi-Sugeno (T-S) fuzzy model is employed to represent a nonlinear singular stochastic system with norm-bounded parameter uncertainties. The objective is to design a state feedback fuzzy controller such that, for all admissible uncertainties as well as normal and different actuator failure cases, the resulting closed-loop system is robustly stochastically stable while satisfying a prescribed performance constraint. Based on linear matrix inequality (LMI) techniques, stochastic Lyapunov function method is adopted to establish sufficient conditions of existence and design method of robust H infin reliable fuzzy controller in terms of stability theory for stochastic differential equations. Finally, a numerical simulation is given to illustrate the effectiveness of the proposed method.

关键词： Robustness Stochastic processes Fuzzy systems Actuators Stochastic systems Reliability theory Stability analysis

来源：评论

学校读者我要写书评

暂无评论

Robust reliable control for uncertain singular stochastic fuzzy systems with time-delay

Robust reliable control for uncertain singular stochastic fu...

引用

World Congress on Intelligent control and Automation (WCICA)

This paper deals with the design problem of robust reliable controller for nonlinear singular stochastic systems. The Takagi-Sugeno (T-S) fuzzy model is employed to represent a nonlinear singular stochastic system with norm-bounded parameter uncertainties and time-delay. Based on linear matrix inequality (LMI) techniques and stability theory of stochastic differential equations, stochastic Lyapunov function method is adopted to design a state feedback fuzzy controller. The resulting closed-loop fuzzy system is robustly reliable stochastically stable for all admissible uncertainties as well as different actuator fault cases. A sufficient condition of existence and design method of robust reliable controller is presented. Finally, a numerical simulation is given to illustrate the effectiveness of the proposed method.

关键词： Stochastic processes Robustness Fuzzy systems Stochastic systems Reliability engineering Reliability theory Actuators

来源：评论

学校读者我要写书评

暂无评论

Study of tumor molecular diagnosis model based on artificial neural network with gene expression profile

Study of tumor molecular diagnosis model based on artificial...

引用

Congress on Evolutionary Computation

作者： Xiaogang Ruan Jinlian Wang Hui Li Xiaoming Li College of Electronic Information and Control Engineering Beijing University of Technology China College of Computer Science Beijing University of Technology China Lang Fang Normal University China

We introduce a method for modeling cancer diagnosis at the molecular level using a Chinese microarray gastric cancer dataset. The method combines an artificial neural network with a decision tree that is intended to precede standard techniques, such as classification, and enhance their performance and ability to detect cancer genes. First, we used the relief algorithm to select the featured genes that could unravel cancer characteristics out of high dimensional data. Then, an artificial neural network was employed to find the biomarker subsets with the best classification performance for distinguishing cancerous tissues and their counterparts. Next a decision tree expression was used to extract rules subsets from these biomarker sets. Rules induced from the best performance decision tree, in which the branches denote the level of gene expression, were interpreted as a diagnostic model by using previous biological knowledge. Finally, we obtained a gastric cancer diagnosis model for Chinese patients. The results show that using the Chinese gastric biomarker genes with the diagnostic model provides more instruction in biological experiments and clinical diagnosis reference than previous methods.

关键词： Cancer Classification algorithms Decision trees Artificial neural networks Training Biological system modeling Gene expression

来源：评论

学校读者我要写书评

暂无评论

Research of key technologies in a Windows CE-based monitoring and control system

Research of key technologies in a Windows CE-based monitorin...

引用

IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Jianmin Duan Fan Lin Zhen Liu College of Electronic Information & Control Engineering Beijing University of Technology Beijing China School of Computer Science Beijing University of Posts and Telecommunications Beijing China

This paper describes a Windows CE-based intelligent system that integrates control and monitoring in one platform. The overall structure of the system is given and some techniques used inside the customization and transplantation of the Windows CE OS are introduced as well. These key techniques include development and transplantation of device drivers in Windows CE, the realization of preserving registry data when power off, the key points of building a special-purpose OS, and the realization of the bootloader. We have designed a temperature control and monitoring system for a heat furnace based on this embedded platform, and the results demonstrate the benefits of using this control solution.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Dynamic range expansion amplifier to measure the slow wave signal from the intestine by telemetry capsule

Dynamic range expansion amplifier to measure the slow wave s...

引用

IEEE/RAS-EMBS International Conference on Biomedical Robotics and Biomechatronics (BioRob)

作者： S. H. Woo T. W. Kim M. U. D. Zia Q. Wei E. U. Chung M. W. Kim J. W. Lee C. H. Won J. H. Cho School of Electronic Engineering and Computer Science Kyungpook National University College of Veterinary Medicine Department of physiology Kyungpook National University Medical & Biological Engineering Kyungpook National University Department of Computer Control & Electrical Engineering Kyung Hee University

Recently, various capsule endoscope systems have been developed, and it is possible measure various bio signal from the human to diagnosis a disease. There have been numerous studies of the myoelectric activity in a stomach, but only a few studies of the small intestines, because, there was no way to measure the signal by non-invasive method. Therefore, it is necessary to research myoelectric measurable telemetry capsule. In this paper, main focuses are implement swallowable telemetry capsule, and enough working time for future clinical experiments. The capsule use dynamic range expansion technique to reduce size of the amplifier, and reduce average power consumption as 3.6 mW; therefore, the capsule can use small batteries, that could be implemented as swallowable size. The capsule is verified by in-vitro experiment, and it amplifies the signal properly.

关键词： Dynamic range Intestines Telemetry Endoscopes Humans Diseases Stomach Battery charge measurement Power amplifiers Energy consumption

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：