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International Joint Conference on Neural Networks (IJCNN)

作者： Maryam Shokri Hamid R. Tizhoosh Mohamed S. Kamel Department of Systems Design Engineering University of Waterloo Waterloo ONT Canada Department of Electrical and Computer Engineering University of Waterloo Waterloo ONT Canada

This paper presents some investigations on tradeoff between exploration and exploitation of opposition-based Q(lambda) with non-Markovian update (NOQ(lambda)) in a dynamic environment. In the previous work the authors applied NOQ(lambda) to the deterministic GridWorld problem. In this paper, we have implemented the NOQ(lambda) algorithm for a simple elevator control problem to test the behavior of the algorithm for non-deterministic and dynamic environment. We also extend the NOQ(lambda) algorithm by introducing the opposition weight to find a better tradeoff between exploration and exploitation for the NOQ(lambda) technique. The value of the opposition weight increases as the number of steps increases. Hence, it has more positive effects on the Q-value updates for opposite actions as the learning progresses. The performance of NOQ(lambda) method is compared with Q(lambda) technique. The experiments indicate that NOQ(lambda) performs better than Q(lambda).

关键词： Elevators Floors Learning Heuristic algorithms Mathematical model Equations Buildings

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Preliminary Intelligibility Tests of a Monaural Speech Segregation System

Preliminary Intelligibility Tests of a Monaural Speech Segre...

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2008 ISCA Tutorial and Research Workshop on Statistical and Perceptual Audio Processing, SAPA 2008

作者： Hu, Ke Divenyi, Pierre Ellis, Dan Jin, Zhaozhang Shinn-Cunningham, Barbara G. Wang, Deliang Department of Computer Science & Engineering Center for Cognitive Science The Ohio State University ColumbusOH43210 United States Speech and Hearing Research VA Medical Center MartinezCA94553 United States Department of Electrical Engineering Columbia University New YorkNY10027 United States Departments of Cognitive & Neural Systems and Biomedical Engineering Boston University BostonMA02215 United States

Human listeners are able to understand speech in the presence of a noisy background. How to simulate this perceptual ability remains a great challenge. This paper describes a preliminary evaluation of intelligibility of the output of a monaural speech segregation system. The system performs speech segregation in two stages. The first stage segregates voiced speech using supervised learning of harmonic features, and the second stage segregates unvoiced speech by subtracting noise energy that is estimated from voiced intervals and onset/offset based segmentation. Objective evaluation in terms of the match to ideal binary time-frequency masks shows substantial improvements. Tests with human subjects indicate that the system improves intelligibility for young listeners when the input SNR is very low, but does not aid elderly listeners. This preliminary evaluation identifies aspects of the system that should be improved in order to produce consistent improvement in intelligibility in noisy environments. © 2008 ITRW on Statistical and Perceptual Audio Processing, SAPA 2008. All rights reserved.

关键词： Supervised learning

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Control design for efficient and cost-effective distributed fuel cell power electronics system

Control design for efficient and cost-effective distributed ...

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Annual Conference of Industrial Electronics Society

作者： Sudip K. Mazumder Sanjaya K. Pradhan Laboratory for Energy and Switching-Electronics Systems Department of Electrical and Computer Engineering University of Illinois Chicago USA Product Design Engineer Philips

Batteries in a fuel cell power system are essential to provide the additional load demands during the sharp load transients. This necessitates a power electronics system, which would control the energy flow between the fuel cell stack, the battery and the load during the transient and in the steady-state. In this paper, a cost-effective and efficient power electronic system is proposed for a fuel cell based hybrid power system based on a distributed power electronics topology. The system includes a hierarchical controlling architecture, in which the master control optimizes the control parameters of the individual subsystem controls, which in turn optimizes the performance and efficiency of the overall system while nullifying the effects of load transients on the fuel cell stack subsystem. The power electronics system concept is further experimentally validated using a four module bidirectional DC-DC converter with Nexa PEM stack.

关键词： Control design Fuel cells Power electronics Control systems Power system transients Batteries Steady-state Hybrid power systems Circuit topology DC-DC power converters

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Blackbox Macromodel with S-Parameters and Fast Convolution

Blackbox Macromodel with S-Parameters and Fast Convolution

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Principles of Advanced and Distributed Simulation (PADS), 2006 Workshop on;Avignon,France

作者： Jose Schutt-Aine Jilin Tan C. Kumar Feras Al-Hawari Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign Urbana IL USA Cadence Design Systems Inc. Chelmsford MA USA

In this paper, the scattering parameters of blackbox multiport networks are pre-processed in the frequency domain to satisfy causality. Next, they are approximated to yield weighted delta functions in the time domain thus allowing the fast simulation. The resulting procedure leads to a robust, accurate and efficient macromodel generation scheme.

关键词： Scattering parameters Convolution Time domain analysis Transfer functions Function approximation Computational modeling Robustness Frequency domain analysis Curve fitting computer simulation

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A sliding mode control applied to whirling pendulum

A sliding mode control applied to whirling pendulum

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International Conference on Signals, Circuits and systems, SCS

作者： Sonia Mahjoub Faical Mnif Nabil Derbel Control design Optimization of complex Systems (ICOS) Research unit on Intelligent France Department of Electrical and Computer Engineering Sultan Qaboos University Muscat Oman

In this paper, we present a VSS-based tracking control for a fixed point regulation of 2-DOF underactuated manipulators. The design approach is systematic and relies on the selection of appropriate choice of two sliding surface. The controller is designed for the both sliding surfaces are attractive. Lyapunov theory is used to study and demonstrate the stability of the system. Convergence of state space is proved and robustness issues to bounded disturbances are also investigated. Simulation results on 2-DOF whirling pendulum are presented to chow the effectiveness of this approach.

关键词： Sliding mode control Control systems Manipulators Actuators Linear feedback control systems Torque control Intelligent control design optimization Mechanical systems Robust control

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Rapid Control Prototyping for Robot Soccer

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IFAC Proceedings Volumes 2008年第2期41卷 9122-9127页

作者： Junwon Jang Soohee Han Hanjun Kim Choon Ki Ahn School of Electrical Engr. & Computer Science Seoul National University Korea BK21 School for Creative Engineering Design of Next Generation Mechanical and Aerospace Systems Seoul National University Korea

In this paper, we propose rapid control prototyping (RCP) for a robot soccer using the SIMTool that has been developed in Seoul National University, Korea for the control aided control system design (CACSD). The proposed RCP enables us to carry out the rapid design and the verification of controls for two-wheeled mobile robots (TWMRs), players in the robot soccer, without writing C codes directly and requiring a special H/W. On the basis of the proposed RCP, a blockset for the robot soccer is developed for easy design of a variety of mathematical and logical algorithms. All blocks in the blockset are made up of basic blocks offered by the SIMTool. User-defined algorithms can be easily and efficiently constructed with just a combination of the blocks in the blockset. In order to validate the proposed RCP in a real game, we employ an official simulation game for the robot soccer, the SimuroSot. Block diagrams are constructed for strategy, path calculation, and the interface to the SIMTool. We show that the algorithms implemented with the proposed RCP work well in the simulation game.

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A small-gain condition for integral input-to-state stability of interconnected retarded nonlinear systems

A small-gain condition for integral input-to-state stability...

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IEEE Conference on Decision and Control

作者： Hiroshi Ito Pierdomenico Pepe Zhong-Ping Jiang Department of Systems Design and Informatics Kyushu Institute of Technology Fukuoka Japan Department of Electrical and Information Engineering University of L'' Aquila L'Aquila Italy Department of Electrical and Computer Engineering Polytechnic Institute of New York University Brooklyn NY USA

ISBN: (纸本)9781424431236

In this paper, interconnected retarded nonlinear systems are considered. Both the constant discrete and distributed time-delays in the subsystems and the interconnections are addressed. A sufficient small-gain type condition for integral input-to-state stability with respect to external inputs is provided in the framework of Lyapunov-Krasovskii functionals.

关键词： Nonlinear systems Interconnected systems Asymptotic stability Control systems Indium tin oxide Delay effects Stability criteria Delay systems Feedback Nonlinear control systems

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On wireless network scheduling with intersession network coding

On wireless network scheduling with intersession network cod...

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Annual Conference on Information Sciences and systems (CISS)

作者： Chih-Chun Wang Ness B. Shroff Center for Wireless Systems and Applications School of Electrical & Computer Engineering Purdue University Calumet West Lafayette IN USA Departments of ECE and CSE Ohio State Uinversity Columbus OH USA

Cross-layer optimization including congestion control, routing, and scheduling has shown dramatic throughput improvement over layered designs for wireless networks. In parallel, the paradigm-shifting network coding has empirically demonstrated substantial throughput improvement when coding operations are permitted at intermediate nodes and packets from different sessions are mixed. designing network codes and the associated flow in network coding presents new challenges for cross-layer optimization for wireless multi-hop networks. This work shows that with a new flow-based characterization of pairwise intersession network coding, a joint optimal scheduling and rate-control algorithm can be implemented distributively. Optimal scheduling is computationally expensive to achieve even in a purely routing-based (without network coding) paradigm, let alone with network coding. Thus, in this paper, the impact of imperfect scheduling is studied, which shows that pairwise intersession network coding can improve the throughput of routing-based solutions regardless of whether perfect/imperfect scheduling is used. Both the deterministic and stochastic packet arrivals and departures are considered. This work shows for the first time a striking resemblance between pairwise intersession network coding and routing, and thus advocates extensions of routing-based wisdoms to their network coding counterpart.

关键词： Wireless networks Network coding Optimal scheduling Throughput design optimization Routing Processor scheduling Spread spectrum communication Scheduling algorithm computer networks

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Remote Experiments for Control Education

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IFAC Proceedings Volumes 2008年第2期41卷 9117-9121页

作者： Soohee Han Bokyu Kwon BK21 School for Creative Engineering Design of Next Generation Mechanical and Aerospace Systems Seoul National University Korea School of Electrical Engr. & Computer Science Seoul National University Korea

This paper suggests remote experiments using the internet for the control education. The remote experiment is composed of equipment server computers, networks accessible to internet, and real plants such as inverted pendulums and crane systems. Additionally, it requires a server program that has I/O functions with plants and calculate the control, an interface program bridging between web and the server program, and the home page including the detail explanation for the usage. For effective educations, how to perform experiments and how to combine the experiment with lectures will be discussed. The simple experiments by entering a few control parameters and the complex experiments by designing overall controls, will be explained. Technologies related with the remote experiment will be introduced. It is demonstrated that the remote experiment will be very useful, particular for control education where students have difficulties in performing the experiments for lack of experimental equipments.

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Fractional-Order Signal Processing using a Polymer-Electrolyte Transistor

Fractional-Order Signal Processing using a Polymer-Electroly...

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51st Midwest Symposium on Circuits and systems (MWSCAS 2008), vol.2

作者： Robert L. Ewing Hoda S. Abdel-Aty-Zohdy Michael C. Hollenbeck Kenneth S. Stevens Information Directorate US Air Force Research Laboratory OH USA Microelectronics System Design Laboratory Department of Electrical and Systems Engineering Oakland University Rochester MI USA Department of Electrical and Computer Engineering University of Utah Salt Lake UT USA

Fractional-order systems have applications in the areas of Flight Control, Robotics, Missile Guidance, Control of Structural Vibrations of Space Platforms and Sensor Technology. Fractional-order transfer functions can characterize complex nonlinear dynamics with many fewer parameters than integer-order functions. This paper addresses the use of a polymer-electrolyte transistor (PET) for use in implementating fractional-order algorithms for signal processing. The PET's advantage over the conventional RC and RL circuits is that it can be both functionally scaled and varied for dynamic fractional-order parameter controllability.

关键词： Fractional-Order Signal Processing Polymer-electrolyte transistor Acid/base chemistry Diffusion Electrokinetic flow

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