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Second-order consensus in networks of dynamic agents with communication time-delays

Journal of Systems Engineering and Electronics 2010年第1期21卷 88-94页

作者： Bo Yang1,2, Huajing Fang3, and Hua Wang4 1. School of Navigation, wuhan University of Technology, wuhan 430063, P. R. China 2. wuhan Second Ship Design and Research Institute, wuhan 430064, P. R. China 3. Department of Control Science and Engineering, Huazhong University of Science and Technology, wuhan 430074, P. R. China 4. Department of Aerospace and Mechanical Engineering, Boston University, Boston MA02215, USA School of Navigation Wuhan University of Technology Wuhan 430063 P. R. China wuhan Second Ship Design and Research Institute Wuhan 430064 P. R. China Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan 430074 P. R. China Department of Aerospace and Mechanical Engineering Boston University Boston MA02215 USA

This paper proposes second-order consensus protocols with time-delays and gives the measure of the robustness of the protocols to the time-delay existing in the network of agents with second-order dynamics. By employing a frequency domain method, it is proven that the information states and their time derivatives of all the agents in the network achieve consensus asymptotically, respectively, for appropriate communication timedelay if the topology of weighted network is connected. Particularly, a tight upper bound on the communication time-delay that can be tolerated in the dynamic network is found. The consensus protocols are distributed in the sense that each agent only needs information from its neighboring agents, which reduces the complexity of connections between neighboring agents significantly. Numerical simulation results are provided to demonstrate the effectiveness and the sharpness of the theoretical results for second-order consensus in networks in the presence of communication time-delays.

关键词： second-order consensus protocols dynamic networks algebraic graph theory frequency domain analysis com-munication constraints.

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On the new results of global attractive set and positive invariant set of the Lorenz chaotic system and the applications to chaos control and synchronization

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Science in China(Series F) 2005年第3期48卷 304-321页

作者： LIAO Xiaoxin 1, 2, 3 , FU Yuli 4 & XIE Shengli 4 1. Department of Control Science & Control Engineering, Huazhong University of Science & Technology, wuhan 430074, China 2. School of Automation, wuhan University of Science & Technology, wuhan 430070, China 3. School of Information, Central South University of Economy, Politics and Law, wuhan 430064, China 4. School of Electronics & Information Engineering, South China University of Technology, Guangzhou 510640, China Correspondence should be addressed to Liao Xiaoxin (email: xiaoxin_liao@***) Department of Control Science & Control Engineering Huazhong University of Science & Technology Wuhan China School of Automation Wuhan University of Science & Technology Wuhan China School of Information Central South University of Economy Politics and Law Wuhan China School of Electronics & Information Engineering South China University of Technology Guangzhou China

Constructing a family of generalized Lyapunov functions, a new method is proposed to obtain new global attractive set and positive invariant set of the Lorenz chaotic system. The method we proposed greatly simplifies the complex proofs of the two famous estimations presented by the Russian scholar Leonov. Our uniform formula can derive a series of the new estimations. Employing the idea of intersection in set theory, we extract a new Leonov formula-like estimation from the family of the estimations. With our method and the new estimation, one can confirm that there are no equilibrium, periodic solutions, almost periodic motions, wandering motions or other chaotic attractors outside the global attractive set. The Lorenz butterfly-like singular attractors are located in the global attractive set only. This result is applied to the chaos control and chaos synchronization. Some feedback control laws are obtained to guarantee that all the trajectories of the Lorenz systems track a periodic solution, or globally stabilize an unstable (or locally stable but not globally asymptotically stable) equilibrium. Further, some new global exponential chaos synchronization results are presented. Our new method and the new results are expected to be applied in real secure communication systems.

关键词： Lorenz chaotic system global attractive set positive invariant set globally exponential tracking globally exponential synchronization.

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The Influence of Residual Stress on Plastic Buckling of Cylindrical Shells

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China Ocean Engineering 1994年第2期9卷 135-144页

作者： Wu Lianyuan Hu Gangyi Professor, Shanghai Jiaotong University, Shanghai 200030 Engineer, wuhan Ship Development & Design Institute, wuhan 430064

-This paper adopts approximate formulas for residual stresses caused by cold bending for plates with stress-strain curve form a = K n. A typical distribution of the longitudinal residual stress due to welding is also assumed. The effects of residual stress due to cold bending and welding on plastic buckling of axially compressed cylindrical shells are studied by the finite element method.

关键词： residual stress cylindrical shells plastic buckling

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ISO9000 and the Quality Management System in the Digital Hospital

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Journal of Huazhong University of Science and Technology(Medical Sciences) 2002年第2期22卷 89-91,99页

作者： LIU Yalan(刘雅兰) YAO Bin(姚斌) ZHANG Zigang(张子刚) College of Management Huazhong University of Science and Technology Wuhan 430074 College of Management Zhongnan University of Economics and Law Wuhan 430064 College of Management Huazhong University of Science and Technology Wuhan 430074

Summary: ISO9000 quality management system (ISO9000QMS) emphasize on the customer-oriented, managers' leadership and all staff's joining, adopt the process method and system management, spread the taking facts as a basis to make decision and improve consistently, and establish win-win relation with the suppliers. So, the digital hospital can adopt the ISO9000QMS. In order to establish the ISO9000QMS, the digital hospital should: (1) Design integrally, including analyzing the operation procedure, clarifying the job duties, setting up the spreading team and setting the quality policy and objectives: (2) Learning the ISO9000 quality standards; (3) Drawing up the documents, including the quality manual, program files and operation guiding files; (4) Training according the documents; (5) Executing the quality standard, including the service quality auditing, quality record auditing and quality system auditing; (6) Improving continually. With the establishment of ISO900QMS, the digital hospital can appraise more accurately, analyze quality matters statistically and avoid the interference of artificial factors.

关键词： ISO9000 quality management system digital hospital

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交往理论与历史唯物主义建构——兼评哈贝马斯对历史唯物主义的“重建”

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武汉大学学报（人文科学版） 2005年第5期58卷 528-534页

作者：何捷一中南财经政法大学人文学院湖北武汉430064

马克思与哈贝马斯都把交往作为其哲学历史观的重要理论范畴,并依据各自的交往理论,沿着不同的理论路径来阐释社会历史的演进和发展,创立了历史唯物主义和致力于历史唯物主义的“重建”。马克思是以全球视域的交往实践观为历史唯物主义... 详细信息

马克思与哈贝马斯都把交往作为其哲学历史观的重要理论范畴,并依据各自的交往理论,沿着不同的理论路径来阐释社会历史的演进和发展,创立了历史唯物主义和致力于历史唯物主义的“重建”。马克思是以全球视域的交往实践观为历史唯物主义理论体系中的基础地位。哈贝马斯是从语言学与释义学出发所建立的交往理性观作为主要理论基石对历史唯物主义的“重建”。因此,应从交往实践观的历史语境与交往理性观的当代话语的对话中,重新解读马克思交往实践观的本真意义。

关键词：交往历史唯物主义重建

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口服5-羟色胺-3受体拮抗药预防化疗引起的呕吐

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中国新药与临床杂志 2002年第11期21卷 672-675页

作者：李性天武汉铁路中心医院临床药学室湖北武汉430064

口服 5 羟色胺 3(5 HT3 )受体拮抗药用于细胞毒药物和其他致吐物质引起的外周反射性呕吐有明显疗效 ,其吸收迅速 ,对 5 HT3 受体有较强亲合力。预防强致吐物引起的呕吐 ,可口服格拉司琼2mg·d- 1或昂丹司琼 2 4mg·d- 1;预防中度致... 详细信息

口服 5 羟色胺 3(5 HT3 )受体拮抗药用于细胞毒药物和其他致吐物质引起的外周反射性呕吐有明显疗效 ,其吸收迅速 ,对 5 HT3 受体有较强亲合力。预防强致吐物引起的呕吐 ,可口服格拉司琼2mg·d- 1或昂丹司琼 2 4mg·d- 1;预防中度致吐物引起的呕吐 ,可采用格拉司琼 1mg·d- 1,或昂丹司琼 8mg ,bid ,或多拉司琼 10 0mg·d- 1。

关键词： 5-羟色胺-3受体拮抗药预防化疗呕吐格拉司琼昂丹司琼多拉司琼

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BEHAVIOR OF ELASTIC TOWING CABLES IN SHEAR CURRENTS

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Journal of Hydrodynamics 2005年第5期17卷 590-595页

作者： HOU Guo-xiang LI Hong-bin ZHANG Sheng-jun YANG Yun-tao XU Shi-hua XIE Wei College of Traffic Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China Systems Engineering Research Institute Beijing 100036 China wuhan Ship Development and Design Institute Wuhan 430064 China

The formulation and solution of governing equations that can be used to analyse the three dimensional behaviour of elastic towing cables subjected to arbitrary sheared currents were presented in this paper. The elastic cable geometry was described in terms of two angles, elevation and azimuth, which are related to Cartesian co ordinates by geometry compatibility relations. These relations were combined with the cable equilibrium equations to obtain a system of non-linear differential equations. In the end, results for cable tension, angles, geometry and elongation are presented for example cases.

关键词： buoy system cable shear current tension

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生态发展是实现经济可持续发展的物质基础

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生态经济 2000年第12期16卷 30-32页

作者：冯静中南财经大学武汉430064

本文提出了生态发展是实现经济可持续发展不可缺少的物质基础 ,并探索生态与经济协调发展的生态化模式的基本框架。

关键词：生态发展可持续发展物质基础经济发展

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Variation of rate of exserted stigma in P(T) GMS lines of rice

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Chinese Rice Research Newsletter 1995年第3期3卷 4-5页

作者： ZHANG Xiangguang and LU Xinggui,Food Grops Research Institute ,Hubei Academy of Agriculiutral,Sciences wuhan 430064,China

Rate of exserted stigmas (RES), ie. the ratio of glumes with exserted stigmas to the total glumes is one of the most important characteristics which affects the out-crossing rate of its combinations. Sixteen P(T) GMS lines with different ecotypes were used to study the variations of RES during their stable sterile period in wuhan from 1992—1993. Ten healthy panicles were randomly selected at full anthesis. Their colour and the number of glumes showing one-side or two-side exserted of stigmas were investigated. Table 1 showed that there were a great variations of RES among the 16 lines tested in two consecutive years (c.v.=43.38%) and among the

关键词： rate RES GMS lines of rice Variation of rate of exserted stigma in P

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A Method for Calculating Hydrodynamic Forces on a Maneuvering Ship

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武汉理工大学学报（交通科学与工程版） 1999年第S1期24卷 120-123页

作者： Yimei Zhou 1) Lewen Zhang 2) Xiuheng Wu 2) (wuhan Ship Development and Design Institute 1) ,wuhan 430064,P.R.China) (wuhan Transportation University 2) ,wuhan 430063,P.R.China)

In order to evaluate the ship’s maneuverability at the initial stage of ship design,this paper introduces a method of calculation of the nonlinear forces which depend on the local form of the *** calculation results ... 详细信息

关键词： cross flow drag local hull form hydrodynamic force

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