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International Conference on Wireless Communications, Networking and Mobile Computing (WiCom)

作者： Wang Lang Liu Juan He Kun Department of Computer Science Wuhan University of China Wuhan China Systems Engineering Institute Control Science and Engineering Department Huazhong University of Science and Technology Wuhan China

With the popularity of mobile phone, the function of the mobile phone has extended from communication tool to other areas, such as amusement, game, Web browsing, and so on. Most of the mobile manufactures have provided some toolkits in their products for developing such kinds of tools. However, different toolkits provided by different mobile phone manufacturers are quite different, mainly on screen size, screen color, way of key-press responsing and unicode character displaying, etc. One must develop the software for particular kind of mobile phones, and it is not easy to transplant the software from one kind of mobile phones to another kind, which bothers the developers quite well. To solve above problems, we have developed a wireless component library, RichUI. By using RichUI, developers can only concentrate on the development of business function without considering the details of different toolkit implementations, and the software developed based on RichUI can be used in different kinds of mobile phones.

关键词： Libraries Mobile handsets Manufacturing Standards development Java Virtual machining Helium computer science systems engineering and theory Communication system control

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Modelling of needle insertion forces for surgical simulation

Modelling of needle insertion forces for surgical simulation

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IEEE International Conference on Mechatronics and Automation

作者： Hua Yang P.X. Liu Jiadong Zhang Department of Systems & Computer Engineering Carleton University Ottawa ONT Canada School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Beijing China

A novel force model for needle insertion into soft tissues has been developed for virtual reality and haptics based simulation of percutaneous therapies. The forces are divided into two parts, stiffness force and friction force, for which a blood vessel model is used in order to improve the realism. The validity of the developed model is confirmed by a comparison between the results from the developed model and those derived from real data.

关键词： Needles Surgery Haptic interfaces Computational modeling Virtual reality Friction Force feedback computer simulation Blood vessels Biological tissues

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Transient modelling of single-electron transistors for efficient circuit simulation by SPICE

Transient modelling of single-electron transistors for effic...

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作者： Yu, Y.S. Hwang, S.W. Ahn, D. Institute of Quantum Information Processing and Systems University of Seoul 90 Jeonnong Dongdaemun Seoul 130-743 Korea Republic of Department of Information and Control Engineering Hankyong National University 67 Seokjeong Anseong Gyeonggi 456-749 Korea Republic of Department of Electronics and Computer Engineering Korea University 5-1 Anam Sungbuk Seoul 136-075 Korea Republic of

In the paper, a regime, where the independent treatment of single-electron transistors (SETs) in transient simulations is valid, has been identified quantitatively. It is found that, as in the steady-state case, although the temperature varies, each SET can be treated independently, even in the transient case when the interconnection capacitance is large enough. However, the value of the load capacitance CL of the interconnections for the independent treatment of SETs is approximately ten times larger than that of the steady-state case. A compact SET transient model is developed for transient circuit simulation by SPICE. The developed model is based on a linearised equivalent circuit and the solution of a master equation is done by the programming capabilities of the SmartSpice. Exact delineation of several simulation time scales and the physics-based compact model make it possible to accurately simulate hybrid circuits in the timescales down to several tens of picoseconds.

关键词： Transistors

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BACKLASH COMPENSATION USING RECEDING HORIZON control

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IFAC Proceedings Volumes 2005年第1期38卷 508-513页

作者： María Seron Kyung Sang Yoo Graham Goodwin Centre for Complex Dynamic Systems and Control School of Electrical Engineering and Computer Science The University of Newcastle Callaghan 2308 NSW Australia Department of Electrical Engineering Doowon Technical College Ansung 456-718 Korea

We present a receding horizon control algorithm for compensation of backlash at the input of a stable linear system under control rate constraints. The problem is first posed as a receding horizon optimal control problem by modelling backlash as a piecewise affine system with a state space partition consisting of three regions. This optimal control problem involves solving, at each step, 3 N quadratic programmes, where N is the optimisation horizon. As an alternative to solving the quadratic programmes, we propose a strategy based on a recently devised suboptimal receding horizon control algorithm which utilises a singular value decomposition of the Hessian of the quadratic programme. This alternative strategy leads, at the cost of some performance degradation, to much smaller computational load since a feasible rather than optimal solution has to be obtained at each step.

关键词： Receding horizon control backlash piecewise affine systems rate constraints model predictive control SVD algorithm

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Continuous time system identification of nonparametric models with constraints

Continuous time system identification of nonparametric model...

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作者： Wang, Liuping Gawthrop, Peter J. Young, Peter C. School of Electrical and Computer Engineering RMIT University Melbourne Australia Center for Systems and Control Department of Mechanical Engineering University of Glasgow Glasgow G12 8QQ United Kingdom Centre for Research on Environmental Syst. and Stat. Lancaster University LA1 4 YQ United Kingdom

ISBN: (纸本)008045108X

Although structural constraints such as model order and time delay have been incorporated in the continuous time system identification since its origin, the constraints on the estimated model parameters were rarely enforced. This paper proposes a continuous time system identification approach with constraints. It shows that by incorporating physical parameter information known a priori as hard constraints, the traditional parameter estimation schemes are modified to minimize a quadratic cost function with linear inequality constraints. Using the structure of Frequency Sampling Filters as the vehicle, the paper shows that the constraints can be readily imposed on continuous time frequency response estimation and step response estimation. in particular, a priori knowledge in both time-domain and frequency domain is utilized simultaneously as the constraints for the optimal parameter solution. A Monte-Carlo simulation study with 100 noise realization is used to demonstrate the improvement of the estimation results in terms of continuous time frequency response and continuous time step response. Copyright © 2005 IFAC.

关键词： Frequency response

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CONTINUOUS-TIME LQ PREDICTIVE POLE-PLACEMENT control

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IFAC Proceedings Volumes 2005年第1期38卷 359-364页

作者： Peter J Gawthrop Wen-Hua Chen Liuping Wang Centre for Systems and Control and Department of Mechanical Engineering University of Glasgow GLASGOW. G12 8QQ Scotland Department of Aeronautical and Automotive Engineering Loughborough University Leicestershire LE11 3TU UK Discipline of Electrical Energy and Control Systems School of Electrical and Computer Engineering RMIT University Melbourne Victoria 3000 Australia

The previously developed Predictive Pole Placement (PPP) controller is modified to give enhanced numerical and stability properties by embedding the method in a linear-quadratic formulation to give a linear-quadratic PPP (LQPPP) controller. Input, output and state constraints are considered using an natural quadratic programming (QP) formulation of LQPPP. Illustrative examples are given.

关键词： Predictive control pole-assignment constraint satisfaction problems quadratic programming continuous-time systems

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Optimal trajectory generation in ocean flows

Optimal trajectory generation in ocean flows

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American control Conference (ACC)

作者： T. Inanc S.C. Shadden J.E. Marsden Department of Electrical and Computer Engineering University of Louisville Louisville KY USA Department of Control and Dynamical Systems California Institute of Technology Pasadena CA USA

In this paper it is shown that Lagrangian Coherent Structures (LCS) are useful in determining near optimal trajectories for autonomous underwater gliders in a dynamic ocean environment. This opens the opportunity for optimal path planning of autonomous underwater vehicles by studying the global flow geometry via dynamical systems methods. Optimal glider paths were computed for a 2-dimensionaI kinematic model of an end-point glider problem. Numerical solutions to the optimal control problem were obtained using Nonlinear Trajectory Generation (NTG) software. The resulting solution is compared to corresponding results on LCS obtained using the Direct Lyapunov Exponent method. The velocity data used for these computations was obtained from measurements taken in August, 2000, by HF-Radar stations located around Monterey Bay, CA, USA.

关键词： Oceans Vehicle dynamics Lagrangian functions Path planning Underwater vehicles Optimal control Contracts control systems Geometry Kinematics

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Self-organized motion in a class of anisotropic swarms: convergence vs oscillation

Self-organized motion in a class of anisotropic swarms: conv...

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American control Conference (ACC)

作者： Tianguang Chu Long Wang Tongwen Chen Center for Systems and Control Department of Mechanics and Engineering ScienceFirst Hospital Peking University Beijing China Department of Electrical and Computer Engineering University of Alberta Edmonton AB Canada

ISBN: (纸本)0780390989

We study an anisotropic swarm model with a class of attraction and repulsion functions. It is shown that the members of a reciprocal swarm aggregates and eventually form a cohesive cluster of finite size around the swarm center within finite time. Under mild conditions on attraction and repulsion functions, the swarm is also completely stable, i.e., every motion converges to the equilibrium point set of the system. These results are further extended to a class of nonreciprocal swarms under the detailed balance condition on coupling weights. We also present numerical simulations demonstrating complex oscillatory behavior in general nonreciprocal swarms. These results provide more insight into the effect of the interaction pattern on collective behavior of swarms.

关键词： Anisotropic magnetoresistance Convergence control systems Stability Numerical simulation Multiagent systems Pattern formation Distributed control Motion control Aggregates

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Boundary conditions and the stability of a class of 2D continuous-discrete linear systems

Boundary conditions and the stability of a class of 2D conti...

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American control Conference (ACC)

作者： D.H. Owens E. Rogers Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK School of Electronics and Computer Science University of Southampton Southampton UK

Differential linear repetitive processes are characterized by a series of sweeps, or passes, through a set of dynamics defined over a finite interval or duration with interaction between successive passes. They are distinct from other classes of 2D continuous-discrete linear systems due to the fact that information propagation in one of the two separate directions only occurs over a finite duration. Moreover, this is an intrinsic feature of the underlying dynamics as opposed to an assumption introduced for analysis purposes. This paper shows that the structure of the initial conditions at the start of each new pass of the process is critical to its stability properties.

关键词： Boundary conditions Linear systems Optimal control Iterative algorithms Asymptotic stability control systems Machining Metals industry Algorithm design and analysis Power system reliability

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Multi-Static Adaptive Microwave Imaging for Early Breast Cancer Detection

Multi-Static Adaptive Microwave Imaging for Early Breast Can...

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Asilomar Conference on Signals, systems & computers

作者： Yao Xie Bin Guo Luzhou Xu Jian Li P. Stoica Department of Electrical and Computer Engineering University of Florida Gainesville FL USA Department of Information Technology Systems and Control Division University of Uppsala Uppsala Sweden

We propose a new multi-static adaptive microwave imaging (MAMI) method for early breast cancer detection. MAMI is a two-stage robust Capon beamforming (RCB) based image formation algorithm. MAMI exhibits higher resolution, lower sidelobes, and better noise and interference rejection capabilities than the existing approaches. The effectiveness of using MAMI for breast cancer detection is demonstrated via a simulated 3-D breast model and several numerical examples

关键词： Microwave imaging Breast cancer Cancer detection Transmitting antennas Receiving antennas Array signal processing Microwave theory and techniques Interference Ultra wideband technology Finite difference methods

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