检索结果-内蒙古大学图书馆

Extending CSP to detect motor imagery in a four-class BCI

Journal of Information and Computational Science 2012年第1期9卷 143-151页

作者： Fang, Yonghui Chen, Minyou Zheng, Xufei Harrison, R.F. State Key Laboratory of Power Transmission Equipment and System Security New Technology Chongqing University Chongqing 400044 China School of Electronic and Information Engineering Southwest University Chongqing 400715 China College of Computer Science Sichuan University Chengdu 610065 China Department of Automatic Control and Systems Engineering University of Sheffield United Kingdom

Brain Computer Interface (BCI) provides a direct communication channel from brain to peripheral equipment. Common Spatial Patterns (CSP) is wildly used to extract features for electroencephalogram (EEG). However, basic CSP only suits two-class discrimination and is unable to solve multi-class discrimination problems. This paper proposes a modified CSP method termed Bisearch Common Spatial Patterns (BCSP) to solve a four-class BCI problem. In BCSP, the Fisher's Linear Discriminant Analysis (LDA) is used to discriminate among the four motor imagery tasks. The BCSP can effectively reduce the number of the basic CSP, and thus makes the overall classification procedure more efficient. The Graz BCI data set from the BCI 2008 competition be used to verify the effectiveness of the BCSP. Simulation results show that BCSP has better performance than other extension schemes. © 2012 Binary Information Press January 2012.

关键词： Brain computer interface

来源：评论

学校读者我要写书评

暂无评论

Feature extraction of motor imagery in BCI with approximate entropy

引用

Journal of Computational Information systems 2012年第6期8卷 2485-2491页

作者： Fang, Yonghui Chen, Minyou Zheng, Xufei Harrison, Robert F State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing 400044 China School of Electronic and Information Engineering Southwest University Chongqing 400715 China College of Computer Science Sichuan University Chengdu 610065 China Department of Automatic Control and Systems Engineering University of Sheffield Sheffield United Kingdom

Approximate Entropy (ApEn) is a regularity statistic that quantifies the unpredictability of fluctuations in a time series and can classify complex systems. This study, ApEn is used to extract features from motor imagery Electroencephalogram (EEC) that containing two motor imagery tasks. This method is different from the traditional way to get the character from EEC. Appropriate parameters must been chosen for different dataset. Two datasets are used in this paper. One comes from BCI Competion2003, the other from the lab of Electromagnetic theory and artincal intelligence, Chongqing University. The results show that ApEn can extract different features in left-hand and right-hand motor imagery EEC efficiently. Comparison between ApEn and Fast Fourier Transform (FFT) shows that ApEn has good capability to the two imagery tasks Brain Computer Interface. © 2012 Binary Information Press.

关键词： Electroencephalography

来源：评论

学校读者我要写书评

暂无评论

Poster:Development of dynamic leg joint model for paraplegic with Functional Electrical Stimulation

Poster:Development of dynamic leg joint model for paraplegic...

引用

1st IEEE International Conference on Computational Advances in Bio and Medical Sciences, ICCABS 2011

作者： Bijanzadeh, M. Jailani, R. Tokhi, M.O. Gharooni, S.C. Department of Automatic Control and System Engineering University of Sheffield United Kingdom

ISBN: (纸本)9781612848525

This paper presents the development of paraplegic joint model using Artificial Neural Network (ANN). A series of experiments using Functional Electrical Stimulation (FES) with different stimulation frequencies, pulse width and pulse duration to investigate the impact on the leg swing angle is conducted. The data obtained is used to develop the paraplegic leg joint model. 74810 training data and 33602 testing data set are used in the development of joint model. The joint model thus developed is validated with clinical data from one paraplegic subject. Two modelling strategies were used to model the leg joint which the ANN joint model is found to be the most useful joint model representing paraplegic leg. The established model is then used to predict the behaviour of the underlying system and will be used in the future for the design and evaluation of various control strategies. © 2011 IEEE.

关键词： Neural networks

来源：评论

学校读者我要写书评

暂无评论

A reliability model for web services: From the consumers' perspective

A reliability model for web services: From the consumers' pe...

引用

2011 International Conference on Computer Science and Service system, CSSS 2011

作者： Zhao, Shi Lu, Xiaoming Zhou, Xianzhong Zhang, Tie Xue, Jianqiang Dept. of Control and System Engineering Nanjing University Nanjing China North Automatic Control Technique Institute Taiyuan China

ISBN: (纸本)9781424497638

This paper proposes a model to quantify the reliability of web services. Based on their structures, web services can be classified into the following two kinds: atomic web service which calls no other web services and composite web service consisting of atomic web services. The model first evaluates the reliability of atomic web services from the consumers' perspective. After that this paper points out redundancy is a very effective approach to improve the reliability of composite web services. Then the reliability issue of composite web services is discussed. A method of computing the aggregating reliability of composite web services is introduced using the structure information with the assumption that the reliabilities of atomic web services in the composite web services are available. © 2011 IEEE.

关键词： Redundancy

来源：评论

学校读者我要写书评

暂无评论

Consensus based decoupling in hybrid optimization of cooperative transportation planning

Consensus based decoupling in hybrid optimization of coopera...

引用

作者： Mangesius, Herbert Sobotka, Marion Stursberg, Olaf Institute of Automatic Control Engineering Technische Universität München Germany Control and System Theory Universität Kassel Germany

ISBN: (纸本)9783902661937

A recently introduced new class of multi-agent transportation planning is considered. Several agents have to cooperate in order to transfer a passive agent from its initial configuration to a goal configuration. Docking events refer to discrete decisions, whereas the individual agents are governed by nonlinear continuous dynamics. Modeling this problem in a hybrid optimal control framework allows computing a solution using a centralized, hierarchical optimization algorithm. Relatively well performing solutions can be found with much lower computational time by decoupling the discrete-event level from the continuous processes. This is accomplished by introducing a feedback controller based on a consensus protocol into the hierarchical optimization structure. The scalability and optimality of this approach is examined for varying information topologies in the consensus protocol and controller gains. © 2011 IFAC.

关键词： Multi agent systems

来源：评论

学校读者我要写书评

暂无评论

automatic design of nonlinear controllers by means of coevolutive algorithms application to an inverted pendulum

Automatic design of nonlinear controllers by means of coevol...

引用

Mediterranean Conference on control and Automation

作者： Fernández Gómez, Francisco Manuel Muros Ponce, Francisco Javier Department of System Engineering and Automatic Control University of Seville Camino de los Descubrimientos s/n 41092 Spain

ISBN: (纸本)9781457701252

This paper focuses on the development of a tool to design nonlinear controllers automatically. This is done by means of an automatic stochastic search: a coevolutive algorithm, inspired by the competitive and symbiotic relationships between certain species in the Nature that evolve in parallel. The algorithm developed is used to look for a law that enable control of a classic system: the inverted pendulum. One of the two species that coevolve is made up of a set of control laws (each of them is a solution). The other one consist of initial conditions (that is a population of problems). The search space of the problem comprises all the possible solutions to it. The populations of the two species that evolve are processed by two different kinds of evolutive algorithms, a genetic algorithm and an algorithm that implements the Genetic Programming paradigm. © 2011 IEEE.

关键词： Inverted pendulum

来源：评论

学校读者我要写书评

暂无评论

Finite state control of FES-assisted walking with spring brake orthosis

Finite state control of FES-assisted walking with spring bra...

引用

2011 UKSim 13th International Conference on Modelling and Simulation, UKSim 2011

作者： Jailani, R. Tokhi, M.O. Gharooni, S.C. Jogtaei, M. Department of Automatic Control and System Engineering University of Sheffield United Kingdom Faculty of Electrical Engineering Universiti Teknologi MARA 40450 Shah Alam Malaysia

ISBN: (纸本)9780769543765

This paper presents finite state control (FSC) of paraplegic walking with wheel walker using functional electrical stimulation (FES) with spring brake orthosis (SBO). The work is a first effort towards restoring natural like swing phase in paraplegic gait through a new hybrid orthosis, referred to as spring brake orthosis (SBO). This mechanism simplifies the control task and results in smooth motion and more-natural like trajectory produced by the flexion reflex for gait in spinal cord injured subjects. The study is carried out with a model of humanoid with wheel walker using the Visual Nastran (Vn4D) dynamic simulation software. Stimulated muscle model of quadriceps is developed for knee extension. Fuzzy logic control (FLC) is developed in Matlab/Simulink to regulate the muscle stimulation pulse-width required to drive FES-assisted walking gait and the computed motion is visualised in graphic animation from Vn4D and finite state control is used to control the transaction between all walking states. Finite state control (FSC) is used to control the switching of brakes, FES and spring during walking cycle. © 2011 IEEE.

关键词： Brakes

来源：评论

学校读者我要写书评

暂无评论

An adaptive sliding mode control law for the power maximization of the wind turbine system

An adaptive sliding mode control law for the power maximizat...

引用

3rd IEEE International Conference on Power engineering, Energy and Electrical Drives, PowerEng2011

作者： Barambones, Oscar De Durana, Jose Maria Gonzalez Automatic Control and System Engineering Departament EUI de Vitoria University of the Basque Country Nieves cano 12 1006 Vitoria Spain

ISBN: (纸本)9781424498444

The actual wind turbines are provided with adjustable speed generators, like the double feed induction generator, that are capable to work in variable speed operations. One of the main advantage of adjustable speed generators is that they improve the system efficiency compared to fixed speed generators because turbine speed is adjusted as a function of wind speed to maximize output power. However this systems requires a suitable speed controller in order to track the optimal wind turbine reference speed. In this work, an adaptive robust control for variable speed wind power generator is described. The proposed robust control law is based on a sliding mode control theory, that presents a good performance under system uncertainties. The proposed sliding-mode control law incorporates an adaptive switching gain, which avoids having to calculate an upper limit of the system uncertainties that is necessary in the traditional sliding-mode control laws. The stability analysis of the proposed controller under disturbances and parameter uncertainties is provided using the Lyapunov stability theory. Finally simulated results show, on the one hand that the proposed controller provides high-performance dynamic characteristics, and on the other hand that this scheme is robust with respect to plant parameter variations and external disturbances. © 2011 IEEE.

关键词： Sliding mode control

来源：评论

学校读者我要写书评

暂无评论

Design of embedded systems able to adapt both scheduling and control parameters

引用

UPB Scientific Bulletin, Series C: Electrical engineering 2011年第4期73卷 11-24页

作者： Niculae, Daniel Dumitrache, Ioan SC IPA SA Bucharest Romania Automatic Control and System Engineering Department Automatic Control and Computers Faculty University POLITEHNICA of Bucharest Romania

The paper will present the implementation of numeric systems for process control and it will explain the problems that arise from the independent way of development of the actual control tasks - oriented to control theory away from the real time system- oriented to operating system theory. It will then be described the effects o running such control on an on-the-shelf resources deprived hardware environment, and the way these can be surpassed using co-designed control theory.

关键词： control theory

来源：评论

学校读者我要写书评

暂无评论

automatic design of nonlinear controllers by means of coevolutive algorithms application to an inverted pendulum

Automatic design of nonlinear controllers by means of coevol...

引用

Mediterranean Conference on control and Automation (MED)

作者： Francisco Manuel Fernández Gómez Francisco Javier Muros Ponce Department of System Engineering and Automatic Control University of Seville Spain

关键词： Algorithm design and analysis Genetic algorithms Angular velocity Genetic programming Data structures Aerospace electronics Mathematical model

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：