检索结果-内蒙古大学图书馆

Decentralized adaptive output-feedback controller design for stochastic nonlinear interconnected systems

AUTOMATICA 2012年第11期48卷 2866-2873页

作者： Fan, Huijin Han, Lixia Wen, Changyun Xu, Li Huazhong Univ Sci & Technol Dept Control Sci & Engn Key Lab Image Proc & Intelligent Control Wuhan 430074 Peoples R China Nanyang Technol Univ Sch Elect & Elect Engn Singapore Singapore Akita Prefectural Univ Dept Elect & Informat Syst Akita Japan

In this paper, the controller design for a class of stochastic interconnected systems with both parametric uncertainties and unknown nonlinear interactions is presented. The diffusion terms considered are dependent on the outputs of local subsystems and allowed to be unbounded. First, by employing decentralized state observers, totally decentralized adaptive tracking controllers with suitable parameter adaptive laws are designed to ensure the boundedness in probability of all the signals in the closed-loop system. It is shown that the tracking errors converge to small residual sets around the origin. Then, for systems with relaxed diffusion vector fields, a decentralized adaptive stabilizing scheme is proposed to ensure the boundedness in probability of all signals in the closed-loop system. (c) 2012 Elsevier Ltd. All rights reserved.

关键词： Decentralized control Adaptive control Stochastic nonlinear systems Interconnected systems

来源：评论

学校读者我要写书评

暂无评论

Artificial Bee Colony algorithm based Auto-Disturbance Rejection control for rehabilitation robotic arm driven by PM-TS actuator

Artificial Bee Colony algorithm based Auto-Disturbance Rejec...

引用

2012 International Conference on Modelling, Identification and control, ICMIC 2012

作者： Wu, Jun Wang, Yongji Huang, Jian Xing, Kexin Key Laboratory of Image Processing and Intelligent Control Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China College of Information Engineering Zhejiang University of Technology Hangzhou Zhejiang 310032 China

ISBN: (纸本)9780956715715

Pneumatic Muscle (PM) has the advantages of cheapness, light weight, compliance, safe and high power/weight. It is suitable for rehabilitation engineering. To minimize the number of PM for driving a single joint of rehabilitation, a new PM-TS actuator comprising a PM and a Torsion Spring (TS) is proposed. Unlike the traditional agonist/antagonist PM actuator, the PM is arranged in appropriate place as agonist and the torsion spring provides opposing torque as antagonist in the proposed actuator. The dynamic model of a 1-DOF (Degree of Freedom) rehabilitation robotic arm is derived considering the PM-TS actuator. To realize high accurate trajectory tracking control of the robotic arm, an Artificial Bee Colony (ABC) algorithm based Auto-Disturbance Rejection control (ADRC) is proposed, where ABC is employed to optimize the control parameters of ADRC. Simulation results demonstrate the validity of PM-TS actuator, and verify that the ABC based ADRC has satisfactory performance. © 2012 Huazhong Univ of Sci & Tec.

关键词： Optimization

来源：评论

学校读者我要写书评

暂无评论

A novel target tracking approach based on ORB used in micromanipulation system

A novel target tracking approach based on ORB used in microm...

引用

2012 International Conference on Modelling, Identification and control, ICMIC 2012

作者： Zuo, Lei Huang, Xinhan Zuo, Wen Key Laboratory of Image Processing and Intelligent Control of Education Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China College of Electronical Engineering Naval University of Engineering Wuhan 430033 China

ISBN: (纸本)9780956715715

Micromanipulation robot is a system which often does some precise manipulations in micro scale space, such as centimeter or millimeter level space, in which micro visual servo system plays a very important role. In visual servo system, it's difficult to give consideration to two or more things such as location accuracy and real-time property at the same time. In this paper, we introduced a novel approach which suited our system very well and could meet both of the above requirements. It was called ORB, a novel feature extracting method which outperformed many current excellent methods such as SIFT and SURF. © 2012 Huazhong Univ of Sci & Tec.

关键词： Target tracking

来源：评论

学校读者我要写书评

暂无评论

Incremental feedback learning methods for voice recognition based on DTW

Incremental feedback learning methods for voice recognition ...

引用

2012 International Conference on Modelling, Identification and control, ICMIC 2012

作者： Chen, Xiaoxia Huang, Jian Wang, Yongji Tao, Chunjing Key Laboratory of Image Processing and Intelligent Control Department of Control Science and Technology Huazhong University of Science and Technology Wuhan China R and D Department National Research Center for Rehabilitation Technical Aids Beijing China

ISBN: (纸本)9780956715715

A Dynamic Time Warping (DTW) based voice recognition approach and its template training problem are discussed in this paper. In order to achieve better recognition accuracies, we proposed two kinds of incremental feedback learning methods for DTW-based voice recognition, including the variable gain coefficient (VGC) based method and the time warping average (TWA) based method. Compared with the non-feedback recognition system, the proposed methods are easy to implement and more robust to noise. A number of comparison experiments are performed to demonstrate the effectiveness of the proposed method. It is also shown that the VGC-based method, whose implementation is easy, achieves significantly better performance than conventional batch template training method without feedback learning. © 2012 Huazhong Univ of Sci & Tec.

关键词： Speech recognition

来源：评论

学校读者我要写书评

暂无评论

Development of wearable bath safety monitoring system for handicapped people

Development of wearable bath safety monitoring system for ha...

引用

2012 International Conference on Modelling, Identification and control, ICMIC 2012

作者： Zhang, Hao Huang, Jian Huo, Weiguang Tao, Chunjing Key Laboratory of Image Processing and Intelligent Control Department of Control Science and Technology Huazhong University of Science and Technology Wuhan China R and D Department of National Research Center for Rehabilitation Technical Aids Beijing China

ISBN: (纸本)9780956715715

With the development of society and progress of technology, people are concerned with their health more and more. Currently there are increasing number of handicapped people, which brings tremendous burden to the society and their families. For handicapped people, bathing is a big challenge because of disabilities and some dangers such as falling down or drowning which will cause severe consequence if not be dealt with in time. To alleviate the burden of society and their families as well as guarantee their safety during bathing, we propose an integrated wearable bath safety monitoring system. This system can detect both fall and drowning emergencies during bathing in real-time and alarm to remote monitoring center for help. The effectiveness of the propose safety monitoring system is confirmed by experiments. © 2012 Huazhong Univ of Sci & Tec.

关键词： Fall detection

来源：评论

学校读者我要写书评

暂无评论

A novel approach for multiple mobile objects path planning: Parametrization method and conflict resolution strategy

引用

PHYSICS LETTERS A 2012年第4期376卷 377-386页

作者： Ma, Yong Wang, Hongwei Zamirian, M. Huazhong Univ Sci & Technol Inst Syst Engn Key Lab Image Proc & Intelligent Control Wuhan 430074 Hubei Peoples R China Islamic Azad Univ Bojnourd Branch Dept Math Bojnourd Iran

We present a new approach containing two steps to determine conflict-free paths for mobile objects in two and three dimensions with moving obstacles. Firstly, the shortest path of each object is set as goal function which is subject to collision-avoidance criterion, path smoothness, and velocity and acceleration constraints. This problem is formulated as calculus of variation problem (CVP). Using parametrization method, CVP is converted to time-varying nonlinear programming problems (TNLPP) and then resolved. Secondly, move sequence of object is assigned by priority scheme: conflicts are resolved by multilevel conflict resolution strategy. Approach efficiency is confirmed by numerical examples. (C) 2011 Elsevier B.V. All rights reserved.

关键词： Mobile object The shortest path planning Parametrization method Time-varying nonlinear programming problem Priority scheme Conflict resolution strategy

来源：评论

学校读者我要写书评

暂无评论

controllability of switching networks of multi-agent systems

引用

INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR control 2012年第6期22卷 630-644页

作者： Liu, Bo Chu, Tianguang Wang, Long Zuo, Zhiqiang Chen, Guanrong Su, Housheng Huazhong Univ Sci & Technol Dept Control Sci & Engn Key Lab Image Proc & Intelligent Control Educ Minist China Wuhan 430074 Peoples R China N China Univ Technol Coll Sci Beijing 100144 Peoples R China Peking Univ Ctr Syst & Control Coll Engn Intelligent Control Lab Beijing 100871 Peoples R China Tianjin Univ Sch Elect Engn & Automat Tianjin Key Lab Proc Measurement & Control Tianjin 300072 Peoples R China City Univ Hong Kong Dept Elect Engn Hong Kong Hong Kong Peoples R China

This paper addresses the controllability of a switching network of multi-agent systems with a leader obeying nearest-neighbor communication rules. The leader is a particular agent acting as an external input to control other member agents. Some computationally efficient sufficient conditions for such multi-agent systems to be controllable are derived. The results show that a multi-agent system can be controllable even if each of its subsystem is not controllable, by appropriately selecting one of the agents as the leader and suitably designing the neighbor-interaction rules via a switching topology. The fixed topology case is analyzed and new controllability conditions and formula of inputs for the desired formation of the network are presented. The controllability of a switching network of multi-agent systems in the presence of communication delay is also investigated. Examples with numerical simulations are given to illustrate the theoretical results. Copyright (C) 2011 John Wiley & Sons, Ltd.

关键词： controllability nearest-neighbor rule multi-agent system switching topology time delay

来源：评论

学校读者我要写书评

暂无评论

Average Consensus of Multi-Agent Systems under Logarithm Quantized Communications

Average Consensus of Multi-Agent Systems under Logarithm Qua...

引用

12th International Conference on control, Automation, Robotics and Vision (ICARCV)

作者： Bian, Tao Wang, Yan-Wu Huazhong Univ Sci & Technol Dept Control Sci & Engn Wuhan 430074 Peoples R China Educ Minist China Key Lab Image Proc & Intelligent Control Wuhan Peoples R China

ISBN: (纸本)9781467318723;9781467318716

In this paper, the average consensus problem of multi-agent systems under logarithm quantized communication is investigated. The logarithm quantizer with finite quantization levels is considered. A sufficient condition is derived to ensure the convergence of the multi-agent system. Finally, a numerical example is given to show the effectiveness of the result obtained in this paper.

关键词： graph theory multi-agent systems

来源：评论

学校读者我要写书评

暂无评论

A novel iterative non-local means algorithm for speckle reduction

A novel iterative non-local means algorithm for speckle redu...

引用

Conference on Medical Imaging - image processing

作者： Zhan, Yi Zhang, Xuming Ding, Mingyue Huazhong Univ Sci & Technol Key Lab Image Proc & Intelligent Control Educ Minist China Sch Life Sci & Technol Wuhan 430074 Peoples R China

ISBN: (纸本)9780819489630

Despeckling of ultrasound images is a crucial step for facilitating subsequent image processing. The non-local means (NLM) filter has been widely applied for denoising images corrupted by Gaussian noise. However, the direct application of this filter in ultrasound images cannot provide satisfactory restoration results. To address this problem, a novel iterative adaptive non-local means (IANLM) filter is proposed to despeckle ultrasound images. In the proposed filter, the speckle noise is firstly transformed into additive Gaussian noise by square root operation. Then the decay parameter is estimated based on a selected homogeneous region. Finally, an iterative strategy combined with the local clustering method based on pixel intensities is adopted to realize effective image smoothing while preserving image edges. Comparisons of the restoration performance of IANLM filter with other state-of-the-art despeckling methods are made. The quantitative comparisons of despeckling synthetic images based on Peak signal-to-noise ratio (PSNR) show that the IANLM filter can provide the best restoration performance among all the evaluated filters. The subjective visual comparisons of the denoised synthetic and ultrasound images demonstrate that the IANLM filter outperforms other compared algorithms in that it can achieve better performance of noise reduction, artifact avoidance, edges and textures preservation and contrast enhancement.

关键词： Non-local means despeckle ultrasound image square root operation decay parameter iterative strategy local clustering

来源：评论

学校读者我要写书评

暂无评论

Global exponential stability of a class of memristor-based recurrent neural networks with time-varying delays

引用

NEUROCOMPUTING 2012年 97卷 149-154页

作者： Zhang, Guodong Shen, Yi Sun, Junwei Huazhong Univ Sci & Technol Dept Control Sci & Engn Wuhan 430074 Peoples R China Educ Minist China Key Lab Image Proc & Intelligent Control Wuhan 430074 Peoples R China Hubei Normal Univ Coll Math & Stat Huangshi 435002 Peoples R China

The paper analyzes a general memristor-based recurrent neural networks with time-varying delays (DRNNs). The dynamic analysis in the paper employs results from the theory of differential equations with discontinuous right-hand side as introduced by Filippov, and some new conditions concerning global exponential stability are obtained. In addition, these conditions do not require the activation functions to be differentiable, the connection weight matrices to be symmetric and the delay functions to be differentiable, our results are mild and more general. Finally, numerical simulations illustrate the effectiveness of our results. (C) 2012 Elsevier B.V. All rights reserved.

关键词： Global exponential stability Recurrent neural networks Memristor Time-varying delays

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：