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International Joint Conference on Neural Networks

作者： Chao Li Ding Wang Derong Liu The State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of Sciences Beijing 100190 China School of Automation and Electrical Engineering University of Science and Technology Beijing 100083 China

ISBN: (纸本)9781509006212

In this paper, we establish a robust optimal control law for a class of continuous-time uncertain nonlinear systems by using a neural-network-based model-free policy iteration approach. The robust control law of the original uncertain nonlinear system is derived by adding a feedback gain to the optimal control law of the nominal system. It is proven that this robust control law can achieve optimality under a specified cost function. Then, the neural-network-based model-free policy iteration algorithm is developed to solve the Hamilton-Jacobi-Bellman equation corresponding to the nominal system without system dynamics. The actor-critic technique and the least squares implementation method are used to obtain the optimal control policy of the nominal system. A numerical simulation is given to verify the applicability of the present robust optimal control scheme.

关键词： Optimal control Cost function Mathematical model Heuristic algorithms Robustness Robust control Nonlinear systems

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A 1-dodecanethiol-based phase transfer protocol for the highly efficient extraction of noble metal ions from aqueous phase

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Journal of Environmental Sciences 2015年第3期27卷 146-150页

作者： Dong Chen Penglei Cui Hongbin Cao Jun Yang State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences University of Chinese Academy of Sciences Research Centre for Process Pollution Control Institute of Process Engineering Chinese Academy of Sciences

A 1-dodecanethiol-based phase-transfer protocol is developed for the extraction of noble metal ions from aqueous solution to a hydrocarbon phase, which calls for first mixing the aqueous metal ion solution with an ethanolic solution of 1-dodecanethiol, and then extracting the coordination compounds formed between noble metal ions and 1-dodecanethiol into a non-polar organic solvent. A number of characterization techniques, including inductively coupled plasma atomic emission spectroscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis demonstrate that this protocol could be applied to extract a wide variety of noble metal ions from water to dichlorometh- ane with an efficiency of 〉96%, and has high selectivity for the separation of the noble metal ions from other transition metals. It is therefore an attractive alternative for the extraction of noble metals from water, soil, or waste printed circuit boards.

关键词： Phase transfer 1-Dodecanethiol Extraction Noble metal ion Efficiency

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Integrated Missile Guidance and control Design with Smooth Adaptive Sliding Mode control 34

Integrated Missile Guidance and Control Design with Smooth A...

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第三十四届中国控制会议

作者： Zhou Jialing Yang Jianying State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering Science College of Engineering Peking University National Key Laboratory of Science and Technology on Aerospace Intelligence Control

ISBN: (纸本)9781467374439

This paper considers the problem of a missile intercepting a maneuvering target with demand for fast finite-time convergence and anti-chattering. Based on the widely used proportional navigation strategy, a novel integrated guidance and control(IGC) scheme is proposed, which is formulated as a second-order affine nonlinear system with uncertainties. Then the smooth adaptive nonsingular terminal sliding mode control(SANTSMC) method which is proposed in our pervious work is applied to this IGC scheme. By virtue of the SANTSMC method, the uncertainties with unknown bounds can be addressed, fast finite-time convergence can be achieved, and the chattering problem can be well solved.

关键词： Missile Interception,Integrated Guidance and control,Anti-chattering,Adaptive Sliding Mode control

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Backstepping sliding mode force/position control for constrained reconfigurable manipulator based on extended state observer

Backstepping sliding mode force/position control for constra...

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World Congress on Intelligent control and Automation (WCICA)

作者： Shuai Wu Bo Dong Guibin Ding Guogang Wang Guangjun Liu Yuanchun Li Department of control engineering in Changchun University of Technology Changchun China State Key Laboratory of Management and Control for Complex Systems Chinese Academy of Sciences Beijing China Department of control engineering in Jilin University Changchun China Department of Aerospace Engineering Ryerson University Toronto Canada

ISBN: (纸本)9781467384155

In this paper, a force/position control method is proposed for constrained reconfigurable manipulators based on extended state observer (ESO). First, the reduced-order dynamic model of the reconfigurable manipulator is formulated in the presence of the external constraint. Second, a backstepping sliding mode force/position controller is designed with extended state observer, which is used to estimate the overall model uncertainty, and the desired position and force can be tracked accurately. The stability of the system is proved by using the Lyapunov theory. Finally, simulations are performed by using the two Dofs of reconfigurable manipulators with different configurations to illustrate the effectiveness of the proposed method.

关键词： Manipulator dynamics Uncertainty Stability analysis Backstepping Observers Force

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GA-simplex algorithm and its application: a case study of gas emission estimation

GA-simplex algorithm and its application: a case study of ga...

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2016年IEEE/INFORMS服务运筹、物流与信息化国际会议

作者： Hui Li Hongqiang Lv Qingqi Lin Jianwen Zhang Information Science and Technology College Beijing University of Chemical Technology State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of Sciences Fluid Mechanics and Heat Transfer Laboratory Beijing University of Chemical Technology

Among the mathematical optimization algorithms, simplex algorithm is a popular and practical algorithm which was listed as one of the top 10 algorithms of the twentieth century by the journal Computing in Science and Engineering. Although simplex algorithm is efficient in the linear programming, the quality of convergence is unacceptable in practice as a numerical breakdown of the algorithm, even for smooth and well-behaved functions. On the other hand, full convergence might be seen in genetic algorithms(GA) using only crossover. So in this paper we combine the GA and simplex algorithm by initializing simplex from the final individual in GA and getting the converged result through simplex algorithm thereafter. A case study in estimating gas emission shows noteworthy improvement of efficiency and stability, compared with GA or simplex algorithm.

关键词： Multidimensional optimization genetic algorithm Simplex algorithm Nelder-Mead algorithm Linear programming

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Web Prefetching of Smart Wireless Access Point

Web Prefetching of Smart Wireless Access Point

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2016年IEEE/INFORMS服务运筹、物流与信息化国际会议

作者： Hui Li Hongqiang Lv Jianwen Zhang Qingqi Lin College of Information Science and Technology Beijing University of Chemical Technology The State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of Sciences Fluid Mechanics and Heat Transfer Laboratory Beijing University of Chemical Technology

Proven to be a viable and cost effective solution for ubiquitous internet access, wireless access network have proliferated at homes, offices, and cafes all over the globe. Being placed at the very edge of the computer network, with increasingly powerful computational ability, wireless access points are more and more suitable for deploying configurable and personalized services for mobile clients. In this paper we propose an intelligent wireless service framework over enhanced wireless access points(refered to as Smrart Wireless Access Point) that prefetch and aggregate web contents on the wired side based on user profiles and delivery it to the user in a wireless network environment. We modify the source code of browser to enhance its data collection capabilities and develop some practical smartphone applications on the mobile client-side. Additionally, we perform some caching stratagy and algorithms when a user have created considerable usage data or rated enough information. Measuring the download latency shows that DNS caching and content caching yields significant improvements in page load time. Prefetching mechanism, recommend system and some rich featured wireless local applications all benefit users much.

关键词： service Web Prefetching of Smart Wireless Access Point

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Neural Network based Constrained Optimal Guidance for Mars Entry Vehicles 34

Neural Network based Constrained Optimal Guidance for Mars E...

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第三十四届中国控制会议

作者： QIU Teng-Hai LUO Biao WU Huai-Ning GUO Lei Science and Technology on Aircraft Control Laboratory Beihang University (Beijing University of Aeronautics and Astronautics) State Key Laboratory of Management and Control for Complex Systems Institute of AutomationChinese Academy of Sciences

ISBN: (纸本)9781467374439

In this paper, an approximate constrained optimal guidance law is proposed for Mars entry vehicles guidance. Firstly, the original guidance of Mars entry vehicle is transformed into a fixed-time optimal tracking control problem, which depends on the solution of the Hamilton-Jacobi-Bellman(HJB) equation. Considering the case the control input is constrained, a generalized non-quadratic performance index is defined. In general, the HJB equation is a nonlinear partial differential equation that is difficult or even impossible to be solved analytically. To overcome the difficulty, neural network(NN) is used to solve the HJB equation approximately. Subsequently, the Monte-Carlo integration method and Latin Hypercube Sampling(LHS) are introduced to compute the integrals on multi-dimensional domains. Finally, the Monte-Carlo simulation results on the Mars entry vehicle demonstrate the effectiveness of the proposed method.

关键词： Guidance,Neural network,Mars entry vehicle,Hamilton-Jacobi-Bellman equation,Monte-Carlo integration

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High-precision NURBS interpolation algorithm based on the bisection method 34

High-precision NURBS interpolation algorithm based on the bi...

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34th Chinese control Conference, CCC 2015

作者： Zhongyi, Zheng Chao, Yang Fengshui, Jing Guodong, Yang State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of Sciences Beijing China

ISBN: (纸本)9789881563897

For a high precision Non-Uniform Rational B-Spline (NURBS) interpolator, calculating the parameter of the next path interpolating point is an indispensable step, which affects feedrate fluctuation. This paper presents a new, simple and precise interpolation algorithm for parameter curve which adopts first-order Taylor's expansion, and then make use of the bisection method to achieve accurate path parameters. In the meanwhile, the interpolator is restricted from geometric and kinematical constraints. A simulation study is conducted to demonstrate the advantages of proposed interpolation algorithm compared with other algorithms for the parametric curves represented in the NURBS form. © 2015 Technical Committee on control Theory, Chinese Association of Automation.

关键词： Interpolation Machining NURBS Precision

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Event-based state estimation of discrete-state hidden Markov models

Event-based state estimation of discrete-state hidden Markov...

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作者： Shi, Dawei Elliott, Robert J. Chen, Tongwen State Key Laboratory of Intelligent Control and Decision of Complex Systems School of Automation Beijing Institute of Technology Beijing100081 China School of Mathematical Sciences University of Adelaide SA5005 Australia Haskayne School of Business University of Calgary CalgaryAB Canada Department of Electrical and Computer Engineering University of Alberta EdmontonABT6G 1H9 Canada

The state estimation problem for hidden Markov models subject to event-based sensor measurement updates is considered in this work, using the change of probability approach. We assume the measurement updates are transmitted through wired or wireless communication networks. For the scenarios with reliable and unreliable communication channels, analytical expressions for the probability distributions of the states conditioned on all the past point- and set-valued measurement information are obtained. Also, we show that the scenario with a lossy channel, but without the event-trigger, can be treated as a special case of the reliable channel results. Based on these results, closed-form expressions for the estimated communication rates under the original probability measure are presented, which are shown to be the ratio between a weighted 1-norm and the 1-norm of the unnormalized conditional probability distributions of the states under the new probability measures constructed. Implementation issues are discussed, and the effectiveness of the results is illustrated by numerical examples and comparative simulations. © 2015 Elsevier Ltd. All rights reserved.

关键词： Hidden Markov models

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Abnormal interhemispheric resting-state functional connectivity in primary open-angle glaucoma

Abnormal interhemispheric resting-state functional connectiv...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Peng Zhou Jieqiong Wang Ting Li Ningli Wang Junfang Xian Huiguang He State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of Sciences and University of Chinese Academy of Sciences Beijing China Beijing Tongren Hospital Capital Medical University Beijing China

ISBN: (纸本)9781457702198

Glaucoma is the second leading cause of blindness and it has been the topic of massive studies to explore the underlying mechanisms of the disease. Resting-state neuroimaging studies have been widely applied to investigate the functional damage of the brain, but little is known about the alterations of the interhemispheric resting-state functional connectivity (RSFC) in patients with primary open-angle glaucoma (POAG). In the present study, we used a newly developed voxel-mirrored homotopic connectivity (VMHC) method to explore the interhemispheric RSFC of the brain in POAG patients. The result showed decreased VMHC in the precuneus and the occipital lobe including calcarine and cuneus, as well as increased VMHC in the lingual gyrus, insula, supramarginal gyrus, and frontal gyrus. Meanwhile, we found the mean VMHC in precuneus was negatively correlated (r=-0.551, P=0.041) with Cup-to-disk Ratio. Significant differences between POAG patients and normal controls reveal the altered brain regions and the functional damage, strengthening the understanding of the primary open-angle glaucoma.

关键词： Visualization Correlation Diseases Optical imaging Retina Magnetic resonance imaging Brain

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