检索结果-内蒙古大学图书馆

American control Conference

作者： Carlos E. de Souza Michel Kinnaert Daniel Coutinho Department of Systems and Control Laboratorio Nacional de Computacao Cientifica - LNCC/MCTI Av. Getulio Vargas 333 Petropolis RJ 25651-075 Brazil Department of Control Engineering and System Analysis Universite Libre de Bruxelles (ULB) Brussels 1050 Belgium Department of Automation and Systems Universidade Federal de Santa Catarina PO Box 476 Florianopolis SC 88040-900 Brazil

ISBN: (纸本)9781479917730

This paper addresses the design of a distributed steady state filter for a sensor network. In the considered scenario, an estimate of the full system state is determined at each network node. The filter structure includes both measurement update terms from neighboring nodes, and a consensus term on the state estimates. The computation of the filter gains is recast as a convex optimization problem. Convergence of the estimation error variance is ensured at each network node and a guaranteed performance in the mean square sense is achieved. Extension of the method to linear parameter-varying systems yields a gain scheduled distributed filter.

关键词： network node mean square Filters linear parameter varying system Sensor networks Distribute State estimation Error measure measurement update

来源：评论

学校读者我要写书评

暂无评论

Improving L2 gain performance of linear systems by reset control 19

Improving L2 gain performance of linear systems by reset con...

引用

19th IFAC World Congress on International Federation of Automatic control, IFAC 2014

作者： Zhao, Guanglei Nešić, Dragan Tan, Ying Wang, Jingcheng Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai200240 China Department of Electrical and Electronic Engineering University of Melbourne ParkvilleVIC3010 Australia

ISBN: (纸本)9783902823625

In this paper, new Lyapunov-based reset rules are constructed to improve C2 gain performance of linear-time-invariant (LTI) systems. By using the hybrid system framework, sufficient conditions for exponential and finite gain C2 stability are presented. It is shown that the C2 gain of the closed loop system with resets can be improved compared with the base system. Numerical example supports our results. © IFAC.

关键词： Closed loop systems

来源：评论

学校读者我要写书评

暂无评论

Scalable load balancing for large-scale web server clusters

引用

Journal of Computational Information systems 2014年第13期10卷 5763-5771页

作者： Huang, Chuibi Wang, Jinlin Wu, Gang Chen, Jun Department of Automation University of Science and Technology of China Key Laboratory of Network Communication System and Control Hefei China Institute of Acoustics Chinese Academy of Sciences National Network New Media Engineering Research Center Beijing China

Load balancing is a fundamental technology to provide scalability for web server clusters. But in the scenarios where the web server clusters have massive amount of user accesses, a single load balancing server is unable to carry the user visits. Therefore load balancing tasks should be undertaken among a set of load balancing servers. Correspondingly the loads among these servers also need to be balanced. In this paper, we proposed a load balancing scheme that could provide scalability, availability and reliability for large-scale web server clusters. The scheme combines existing routing techniques and splits the function of load balancing into three levels that could be implemented by different devices, thereby enabling the web server cluster scales with user accesses. The experiment results have demonstrated the effectiveness of the program. © 2014 by Binary Information Press

关键词： Scalability

来源：评论

学校读者我要写书评

暂无评论

Wastewater treatment prediction based on immune optimization multi-output least squares support vector regression machine

Wastewater treatment prediction based on immune optimization...

引用

2013 IEEE Conference Anthology, ANTHOLOGY 2013

作者： Ye, Hongtao Fei, Luo Xu, Yuge Tan, Guangxing School of Automation Science and Engineering South China University of Technology Guangzhou China Department of Electronic Information and Control Engineering Guangxi University of Technology Liuzhou China

ISBN: (纸本)9781479916603

In order to improve effluent water quality prediction precision of wastewater treatment system, the main factors which have influence on the effluent quality are analyzed. Wastewater treatment system is a multi-input multi-output system. But the traditional support vector regression machine (SVRM) algorithms are only used for single-output systems. If several SVRM models are constructed for multi-input multi-output systems, it will increase the complexity of the algorithm and the precision is poor for the correlation of output variables. In order to solve prediction problem of multi-output system, a method of multi-output least squares support vector regression machine (LS-SVRM) based on immune optimization is proposed in this study. The multi-output LS-SVRM is used to predict effluent quality, using the immune algorithm to optimize the parameters of the multi-output LS-SVRM. Simulation shows that the proposed method has a better prediction precision for wastewater treatment system. © 2013 IEEE.

关键词： Wastewater treatment

来源：评论

学校读者我要写书评

暂无评论

State Estimation of Finite-State Hidden Markov Models Subject to Stochastically Event-triggered Measurements

State Estimation of Finite-State Hidden Markov Models Subjec...

引用

IEEE Annual Conference on Decision and control

作者： Wentao Chen Junzheng Wang Ling Shi Dawei Shi State Key Laboratory of Intelligent Control and Decision of Complex Systems School of Automation Beijing Institute of Technology Beijing 100081 P.R. China Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong

ISBN: (纸本)9781479978878

We consider the event-triggered state estimation of a finite-state hidden Markov model with a general stochastic event-triggering condition. Utilizing the change of probability measure approach and the event-triggered measurement information available to the estimator, analytical expressions for the conditional probability distributions of the states are obtained, based on which the minimum mean square error event-based state estimates are further calculated. We show that the results also cover the case of packet dropout, under a special parameterization of the event-triggering conditions. With the results on state estimation, a closed-form expression of the average sensor-to-estimator communication rate is also presented. The effectiveness of the proposed results is illustrated by a numerical example and comparative simulations.

关键词： State estimation Hidden Markov models Event trigger Probability distribution Mean square error numerical example

来源：评论

学校读者我要写书评

暂无评论

Development and learning control of a human limb with a rehabilitation exoskeleton

引用

IEEE Transactions on Industrial electronics 2014年第7期61卷 3776-3785页

作者： Lu, Renquan Li, Zhijun Su, Chun-Yi Xue, Anke Institute of Information and Control Hangzhou Dianzi University Hangzhou 310018 China Key Laboratory of Autonomous System and Network Control College of Automation Science and Engineering South China University of Technology Guangzhou 510640 China College of Automation Science and Engineering South China University of Technology Guangzhou 510640 China Department of Mechanical and Industrial Engineering Concordia University Montreal QC H3G 1M8 Canada

This paper describes a novel development of a lower limber exoskeleton for physical assistance and rehabilitation. The developed exoskeleton is a motorized leg device having a total of 4 DOF with hip, knee, and ankle actuated in the sagittal plane. The exoskeleton applies forces and learns the impedance parameters of both robot and human. An adaptive control scheme by incorporating learning control approaches into the exoskeleton system is developed to help the leg movement on a desired periodic trajectory and handle periodic uncertainties with known periods. The proposed control approach does not require a muscle model and can be proven to yield asymptotic stability for a nonlinear muscle model and an exoskeleton model in the presence of bounded nonlinear disturbances (e.g., spasticity and fatigue). The performance of the controller is demonstrated through closed-loop experiments on human subjects. The experiments illustrate the ability of the exoskeleton to enable the leg shank to track single and multiple period trajectories with different periods and ranges of motion. © 2013 IEEE.

关键词： Muscle

来源：评论

学校读者我要写书评

暂无评论

Feedforward and feedback control of dynamic systems 19

Feedforward and feedback control of dynamic systems

引用

19th IFAC World Congress on International Federation of Automatic control, IFAC 2014

作者： Hu, Wuhua Camacho, Eduardo F. Xie, Lihua School of Electrical and Electronic Engineering Nanyang Technological University Singapore Singapore Department of System Engineering and Automatic Control Escuela Superior de Ingenieros University of Sevilla Spain

ISBN: (纸本)9783902823625

Recently the control methods based on disturbance rejection have largely renewed our understanding of automatic control, especially the role of feedforward control. With the renewed understanding, this work presents a feedforward and feedback approach for control of general dynamic systems under a state tracking framework. This is realized by introducing a fictitious system model and employing a proper state and disturbance estimator. The resultant control scheme embodies a close cooperation between feedforward and feedback controls: Feedforward control rejects the general disturbance and embeds a reference state trajectory, whilst feedback control cancels the fictitious dynamics and enforces desired tracking error dynamics. A notable advantage of the approach is that control designs of linear and nonlinear systems can follow a common routine and the closed-loop stability is guaranteed under standard conditions. © IFAC.

关键词： Closed loop control systems

来源：评论

学校读者我要写书评

暂无评论

Implementation of Input Shaping control to Reduce Residual Vibration in Industrial Network Motion system

Implementation of Input Shaping Control to Reduce Residual V...

引用

International Conference on control, automation and systems

作者： Ha-Quang-Thinh Ngo Quoc-Chi Nguyen Won-Ho Kim Control and Automation Lab Department of Mechatronics Engineering Ho Chi Minh City University of Technology Department of Mechatronics Engineering Ho Chi Minh City University of Technology Department of Intelligent System Engineering Dong-Eui University

ISBN: (纸本)9781479999767

In this paper, a method to implement the input shaping control in Mechatrolink-III motion system is introduced. Firstly, the underdamped system is theoretically built by modeling. Then, the motion controller of Mechatrolink-III network is designed to apply the input shaper for reducing residual vibration in manufacturing machine. Later, the experimental beam is set-up to verify the effective performance of input shaping technique. The validity of the control strategy is practically performed by testing ZV, ZVD and ZVDD input shapers. Especially, the successful implementation provides an opportunity to apply the input shaper for multi-axes since Mechatrolink-III motion controller supports up to 32 axes.

关键词： Motion control Input shaping Mechatrolink-III Industrial network Residual vibration

来源：评论

学校读者我要写书评

暂无评论

Resource allocation in ofdma-based cognitive radio networks via cooperation with primary users

引用

Journal of Communications 2015年第5期10卷 294-300页

作者： Tang, Yi Wang, Lijie Grace, David Wang, Zibin National Key Laboratory of Science and Technology on Information System Security Beijing100101 China College of Electronic Science and Engineering National University of Defense Technology Hunan410073 China China Xi’an Satellite Control Center Xi’an China Department of Electronics University of York YorkYO10 5DD United Kingdom

This paper considers an OFDMA-based cooperative cognitive radio network where the secondary users (SUs) act as the relay of the primary users (PUs) while guaranteeing the quality of service (QoS) of the PUs. In return, the SUs access the spectrum licensed to PUs in both time and frequency without impacting the communication of the PUs. A joint resource allocation problem is formulated to maximize the data rate of the SUs. It is proven that the optimization problem can be decomposed into two coupled subproblems which are power allocation and relay selection. The power allocation adopts the water-filling algorithm using the Lagrangian method, and the optimal relay selection is solved by Hungarian method. Simulation results show that the proposed algorithm can bring revenue to both the PUs and SUs. © 2015 Journal of Communications.

关键词： Quality of service

来源：评论

学校读者我要写书评

暂无评论

Unambiguous synchronization scheme for GNSS BOC(n,n) signals

引用

Journal of Networks 2014年第8期9卷 2224-2231页

作者： Qi, Jiamin Chen, Jiapin Geng, Yu System Control and Info Processing Group Research Inst of Micro Nano Science and Technology Shanghai Jiaotong University Shanghai China Mechanical and Electronic Department School of Mechanical and Automotive Engineering Hubei University of Arts and Science XiangYang China

Galileo and Modernized GPS have included in their signal structures a new signal modulation: the Binary Offset Carrier (BOC), which multiplies a spreading code with a square wave sub-carrier. It creates a split spectrum with two main lobes shifted from the center frequency by sub-carrier. This modulated signal induces better tracking in white noise and better inherent multipath mitigation compared to the spreading code alone. However, it also makes acquisition more challenging and tracking potentially ambiguous due to its multiple peak autocorrelation function. This paper, instead of trying to find a generic solution, focuses on a specific BOC signal: the BOC(n,n). A novel tracking technique dedicated to BOC(n,n) signals has been developed by using a synthesized local cross correlation function between received BOC signal and local PRN. It completely removes the side-peak threating. Simulation results show that the combined tracking loops can eliminate false lock points. It also reduces the standard tracking deviation error and slightly degrade its probability of detection compared with the standard tracking algorithm. © 2014 ACADEMY PUBLISHER.

关键词： Global positioning system

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：