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International Symposium on Electromagnetic Compatibility, EMC EUROPE 2012

作者： Xiao, Li Yu, Zhanqing Chen, Shuiming Zhang, Bo Zeng, Rong Zhuang, Chijie Zeng, Yang Yu, Xiaoying Zhang, Qian State Key Lab of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China Research Institute Zoomlion Heavy Industry Science and Technology Development Co. Ltd. Changsha Hunan China

ISBN: (纸本)9781467307185

The Electromagnetic Compatibility (EMC) is a major issue for the truck crane designing, due to the large dimension. The conducted disturbance sources of truck crane was measured under stable conditions, the time domain characteristics of possible conducted disturbance sources was analyzed, and typical waveforms were concluded to solve the EMC (Electromagnetic Compatibility) issue. The electromagnetic disturbance characteristics at different test points under different operation conditions were compared, and the influence of different factors was studied. The amplitude and frequency parameters of the major disturbance sources were compared with the standard immunity test pulses suggested by ISO7637-2. The differences between them indicate that the extant standard might not apply to the test of the truck crane. The presented results could form a basis for the development of a special standard for the EMC test of the truck crane and further relevant EMC research. © 2012 IEEE.

关键词： Electromagnetic compatibility

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Micro-cantilever design and modeling framework for quantitative multi-frequency AFM

Micro-cantilever design and modeling framework for quantitat...

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IEEE Conference on Nanotechnology

作者： Naveen Shamsudhin Hugo Rothuizen Michel Despont John Lygeros Abu Sebastian Institute of Robotics and Intelligent Systems ETH Zurich Zurich Switzerland IBM Research Zurich Research Laboratory Ruschlikon Switzerland Automatic Control Laboratory ETH Zurich Zurich Switzerland

Recently several multi-frequency imaging techniques have been proposed that have opened up a multitude of information channels to probe surface properties in atomic force microscopy (AFM). However, the dynamics involved are significantly more complicated than in the traditional AFM modes, and hence quantitative multi-frequency AFM (MF- AFM) remains a key challenge. In this paper, we introduce custom-made micro-cantilevers with integrated actuators and a systems-theoretic modeling framework for MF-AFM, which together provide powerful experimental and theoretical tools for quantitative measurement of tip-sample interaction forces and sample properties.

关键词： Force Actuators

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Online Learning Algorithm for Stackelberg Games in Problems with Hierarchy

Online Learning Algorithm for Stackelberg Games in Problems ...

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IEEE Annual Conference on Decision and control

作者： K. G. Vamvoudakis F. L. Lewis M. Johnson W. E. Dixon Center for Control Dynamical-systems and Computation (CCDC) University of California Automation and Robotics Research Institute University of Texas at Arlington NASA Ames Research Center Department of Mechanical and Aerospace Engineering University of Florida

ISBN: (纸本)9781467320658

This paper presents an online adaptive optimal control algorithm based on policy iteration reinforcement learning techniques to solve the continuous-time Stackelberg games with infinite horizon for linear systems. This adaptive optimal control method finds in real-time approximations of the optimal value and the Stackelberg-equilibrium solution, while also guaranteeing closed-loop stability. The optimal-adaptive algorithm is implemented as a separate actor/critic parametric network approximator structure for every player, and involves simultaneous continuous-time adaptation of the actor/critic networks. Novel tuning algorithms are given for the actor/critic networks. The convergence to the closed-loop Stackelberg equilibrium is proven and stability of the system is also guaranteed. A simulation example shows the effectiveness of the new online algorithm.

关键词： Stackelberg games Hierarchical control problems adaptive optimal control Social Hierarchy Game theory e-learning infinite horizon Best value algorithms

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An online integral reinforcement learning algorithm to solve N-player Nash games

An online integral reinforcement learning algorithm to solve...

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IEEE International Symposium on Intelligent control (ISIC)

作者： Kyriakos G. Vamvoudakis Frank L. Lewis Center for Control Dynamical-systems and Computation (CCDC) University of California Santa Barbara CA USA Automation and Robotics Research Institute University of Texas Arlington Fort Worth TX USA

In this paper we introduce an online algorithm that uses integral reinforcement knowledge for learning the continuous-time Nash game (zero-sum and non-zero-sum) solution for nonlinear systems with infinite horizon costs and partial knowledge of the system dynamics. This algorithm is a data based approach to the solution of the coupled Hamilton-Jacobi equations and it does not require explicit knowledge on the system's drift dynamics. A novel adaptive control algorithm is given that is based on policy iteration and implemented using an actor/critic structure for every player in the game having 2N adaptive approximator structures. All 2N approximation networks are adapted simultaneously. Novel adaptive control tuning algorithms are given for the critic and actor networks. The convergence to the Nash solution of the game is proven, and stability of the system is also guaranteed. Simulation examples support the theoretical result.

关键词： Games Equations Heuristic algorithms Tuning Mathematical model Approximation algorithms Artificial neural networks

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Active control of Free Paraboloidal Membrane Shells Using Photostrictive Actuators

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Transactions of Tianjin University 2011年第1期17卷 6-12页

作者：王新杰岳洪浩邓宗全 State Key Laboratory of Robotics and Systems Harbin Institute of Technology Research Center of Aerospace Mechanism and Control Harbin Institute of Technology

The paraboloidal membrane shell with free boundary condition is actively controlled using photostrictive actuators which can provide contactless actuation under the illumination of ultraviolet light. The governing equations of the paraboloidal shell laminated with paired photostrictive actuators are established based on membrane approximation. The modal control actions of meridional/circumferential actuators are respectively formulated and evaluated by case studies. Constant light intensity related to the velocity of the shell is adopted, and then the governing equations are written in a closed-loop form which can be solved with Newmark-β method. Considering the multi-field coupling behavior of photostrictive actuators, time histories of transverse displacement and control light intensity are simulated and evaluated. The results show that photostrictive actuators can effectively control the vibration of the paraboloidal membrane shell, and the photostrictive actuators oriented along circumferential direction can give better control effect than photostrictive actuators placed along the meridional direction.

关键词： photostrictive actuator paraboloidal shell active control membrane approximation

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development of integrated optical characterization bench for sensing microfluidic channel

Development of integrated optical characterization bench for...

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IEEE Conference on Electron Devices and Solid-State Circuits

作者： Charusluk Viphavakit Joydeep Dutta Sakoolkarn Boonruang Nithi Atthi Waleed S. Mohammed Center of Excellent in Nanotechnology (COEN) Asian Institute of Technology Klong Luang Pathum Thani Thailand Thai Microelectronics Center (TMEC) National Science and Technology Development Agency Chachoengsao Thailand Photonics Technology Laboratory NECTEC National Science and Technology Development Agency Klong Luang Pathum Thani Thailand Center of Research in Optoelectronics Communications and Control Systems (BU-CROCCS) School of Engineering Bangkok University Klong Luang Pathum Thani Thailand

This work introduces design, fabrication and characterization of an optical based integrated flow rate sensor where the light- fluid interaction is maximized by allowing the liquid and light to propagate along the same direction. This is achieved by placing a 10 μm deep channel between two waveguides. The optical waveguides are tapered down to the channel width to feed the light in and out, where tapering is done to minimize the coupling and propagation loss. The output signal is detected by a fast receiver (higher than 1MHz) that records the dynamic change of the light intensity when fluid flows through the channel. The initial results showed a dynamic range of measurement up to 0.18.

关键词： Optical waveguides Microfluidics Optical sensors Image motion analysis Computer vision Microchannel Optical device fabrication

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Test and Analysis of Conducted Disturbance Sources of the Truck Crane under Stable Conditions

Test and Analysis of Conducted Disturbance Sources of the Tr...

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International Symposium on Electromagnetic Compatibility

作者： Li Xiao Zhanqing Yu Shuiming Chen Bo Zhang Rong Zeng Chijie Zhuang Yang Zeng Xiaoying Yu Qian Zhang State Key Lab of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Research Institute Zoomlion Heavy Industry Science & Technology Development Co. Ltd.

ISBN: (纸本)9781467307185

关键词： Truck crane EMC Conducted disturbance source Time domain characteristics Electromagnetic immunity test

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Determinants of Corporate Dividend Policy: A Tobit Model Approach

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Vision 2012年第3期16卷 153 - 162页

作者： Monica Singhania Akshay Gupta Monica Singhania () is Associate Professor Faculty of Management Studies (FMS) University of Delhi Delhi India. She is a Fellow Member (FCA) of the Institute of Chartered Accountants of India. She has been awarded Ph.D. in the area of corporate finance and taxation from the University of Delhi. She is the author of seven books on direct tax laws and has several research papers published in leading journals. She teaches management accounting management control systems project management and corporate taxation to MBA students at FMS. Akshay Gupta () belongs to the MBA Class of 2011 Faculty of Management Studies (FMS) University of Delhi Delhi India. He is also Bachelor of Engineering (with distinction and merit) from Delhi College of Engineering University of Delhi. Prior to joining FMS he has worked as Software Engineer with Cisco Systems and as an Intern with various organizations such as Mentor Graphics Defense Research and Development Organization (DRDO) and Central Electronics Engineering Research Institute (CEERI). His interest lies in Quantitative Finance Equity Research and Portfolio Management.

Dividend is the return that a shareholder gets from a company, out of its profits, on his shareholding. Equity investors receive returns in two forms—dividends and capital gains. The factors that drive dividend policy of a company have been topic of extensive research for a long time now with various, sometimes even conflicting, theories trying to find some pattern in the behaviour vis-à-vis dividend payouts. The objective of the article is to find the validity of the different views on determinants of dividend policy in India and empirically prove their significance using Tobit regression model. We develop framework based on major theories on corporate dividends available in literature so as to examine the determinants of dividends comprehensively. The firm-level panel data of National Stock Exchange (Nifty 50) companies from 1999–2000 to 2009–2010 is taken for this purpose. Accuracy and validity of the results is ensured using various diagnostic tests and test procedures to find the best-fit models. The findings suggest that firm’s size (market capitalization) and firm’s growth and investment opportunity are significant determinants of corporate dividend policy in India. The firm’s debt structure, profitability and experience are found to be not significant in the Indian scenario and in this way the results do negate some theories. The results of the study can be used by investors to take informed decision while deciding on investments based on dividend yield for Nifty 50 Index companies and to predict dividend yields in future using the significant determinants.

关键词： Payout Policy Dividend Behaviour Determinants Tobit Regression

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Actuator delayed active vehicle suspension control: A T-S fuzzy approach

Actuator delayed active vehicle suspension control: A T-S fu...

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IEEE International Conference on Fuzzy systems (FUZZ-IEEE)

作者： Hongyi Li Honghai Liu Huijun Gao Intelligent Systems & Biomedical Robotics Group School of Creative Technologies University of Portsmouth Portsmouth UK Research Institute of Intelligent Control and Systems Harbin Institute of Technology Harbin China

This paper focuses on fuzzy H ∞ controller design for uncertain active suspension systems with actuator delay based on Takagi-Sugeno (T-S) model approach. This dynamic system is presented by taking into account the sprung and unsprung mass variations, the actuator delay, and the suspension performance. The fuzzy H ∞ controller is designed such that the resulting T-S fuzzy system is asymptotically stable and guarantees H ∞ performance, and simultaneous satisfying the constraint performance. The existence condition of fuzzy H ∞ control is obtained in terms of linear matrix inequalities (LMIs) and can be solved by using the standard software. A quarter-car suspension model is provided to validate the effectiveness of the proposed design procedures.

关键词： Suspensions Vehicles Roads Tires Actuators Delay Fuzzy systems

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A Distance and Diversity Measure for Improving the Evolutionary Process of Modular Robot Organisms

A Distance and Diversity Measure for Improving the Evolution...

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IEEE International Conference on robotics and Biomimetics

作者： Lutz Winkler Heinz Worn Adrian Friebel Institute for Process Control and Robotics Karlsruhe Institute of Technology - KIT Research Group for Multicellular Systems Biology Interdisciplinary Centre for Bioinformatics (IZBI) University of Leipzig

ISBN: (纸本)9781457721366

In this paper, we present a novel diversity measure for a population of modular robot organisms. Evaluating this diversity we will get a prospect of the fitness of future generations of organisms in an evolutionary process. The degree of the diversity in a population is a measure for the adaptability to the environment. If the diversity is too low, it is necessary to change evolutionary parameters such as mutation probabilities or to start a new evolutionary run in order to get better adapted organisms. The novel measure helps to improve and speed-up the evolutionary process, which is mandatory as the evolution of robot organisms, specially the coevolution of controller and topology of organisms is a very tedious process. In four different experiments using the Robot3D simulator and the Symbricator modular robots, we will show the usefulness of this diversity measure. The goal of the first two experiments will be the evaluation of two different selection strategies: fitness proportionate and rank selection. In the last two experiments we will explore the differences between a restrained evolution, where the type of agent, which controls an element in an organism is predetermined by its parent element, and a free evolution.

关键词： Organism Modular robots Evolutionary health evolution evolution evolution Elements

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