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Advances in Intelligent and Soft Computing 2011年 97卷 285-299页

作者： Woda, Marek Kubacki-Gorwecki, Konrad Institute of Computer Engineering Control and Robotics Wroclaw University of Technology Wybrzeze Wyspiańskiego 27 50-370 Wroclaw Poland

ISBN: (纸本)9783642213922

This chapter is dedicated to an effective learning environment implementation, and more precisely the development of algorithms that improve effectiveness of the learning process using the automatic selection of the difficulty of lessons depending on individual student characteristics and selection of the architecture to increase the technical efficiency of the process through the use of appropriate technical means to build e-learning system. © 2011 Springer-Verlag Berlin Heidelberg.

关键词： computer aided instruction

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Avoiding probability saturation during adjustment of markov models of ageing equipment

Advances in Intelligent and Soft Computing

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Advances in Intelligent and Soft Computing 2011年 97卷 205-217页

作者： Sugier, Jaroslaw Wroclaw University of Technology Institute of Computer Engineering Control and Robotics ul. Janiszewskiego 11/17 50-372 Wroclaw Poland

ISBN: (纸本)9783642213922

Markov models are well established technique used widely for modeling equipment deterioration. This work presents an approach where Markov models represent equipment ageing and also incorporate various maintenance activities. Having available some basic model it is possible to adjust its parameters so that it represents some hypothetical new maintenance policy and then to examine impact that this new policy has on various reliability characteristics of the system. The paper deals with a method of model adjustment and specifically investigates its one particular problem: avoiding probability saturation in a model which is tuned towards increased repair frequencies. The text describes the adjustment method in a general case, identifies specific risk of probability saturation that may take place during the iterative procedure and proposes a new extension to the method that overcomes this problem with minimal intervention in the internal structure of the model, in a specific class of cases. © 2011 Springer-Verlag Berlin Heidelberg.

关键词： Iterative methods

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Human resource influence on dependability of discrete transportation systems

Advances in Intelligent and Soft Computing

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Advances in Intelligent and Soft Computing 2011年 97卷 271-283页

作者： Walkowiak, Tomasz Mazurkiewicz, Jacek Institute of Computer Engineering Control and Robotics Wroclaw University of Technology ul. Wybrzeze Wyspianskiego 27 50-370 Wroclaw Poland

ISBN: (纸本)9783642213922

The chapter is focused on the human resource influence on dependability of discrete transportation systems (DTS). The human resource means the driver of the vehicle. We add him/her as a new element of the system description. The dependability means the combination of the reliability and functional parameters of the DTS. This way the analysis of the DTS behavior seems to be more sophisticated. The unified containers transported by trucks with the set of time-type assumptions are the essence of the system discussed. The proposed method is based on modeling and simulating of the system behavior. The income of containers is modeled by a stochastic process. Each container has a source and destination address. The central node is the destination address for all containers generated in the ordinary nodes. We also propose the heuristic management approach as well as the functional metric for DTS and we test the example system based on the real data. © 2011 Springer-Verlag Berlin Heidelberg.

关键词： Containers

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Functional based reliability analysis of web based information systems

Advances in Intelligent and Soft Computing

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Advances in Intelligent and Soft Computing 2011年 97卷 257-269页

作者： Walkowiak, Tomasz Michalska, Katarzyna Institute of Computer Engineering Control and Robotics Wroclaw University of Technology ul. Wybrzeze Wyspianskiego 27 50-370 Wroclaw Poland

ISBN: (纸本)9783642213922

The chapter presents a method of Web-based information system dependability analysis based on functional and reliability approach. A service availability is predicted by developed by authors a two level simulator (using Monte-Carlo based estimation). Taxonomy of the faults is described. Numerical experiments were performed on a test case scenario that was modeled as a network of interacting tasks and technical infrastructure required for the service realization. © 2011 Springer-Verlag Berlin Heidelberg.

关键词： Reliability analysis

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How to predict future in a world of antibody-antigen chromosomes

How to predict future in a world of antibody-antigen chromos...

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Federated Conference on computer Science and Information Systems (FedCSIS)

作者： Zbigniew Pliszka Olgierd Unold Wroclaw Public Library Wroclaw Poland Institute of Computer Engineering Control and Robotics Wroclaw University of Technology Wroclaw Poland

The paper deals with a representation of the antibody-antigen chromosomes. The proposed new binary decoding allows us to prove the dependence between subsequent generations of chromosomes, using quick and simple operations on chromosomes indices, instead of processing the binary strings. Some formal properties of the immune system were expressed based on this representation. A consistency theoretical proof for epistatic properties as well as exploration possibilities of a crossover operator was given.

关键词： Biological cells Mathematical model Immune system Encoding Aerospace electronics Equations Indexes

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Feature referenced tip localization enhanced by probability motion model for AFM based nanomanipulations

Feature referenced tip localization enhanced by probability ...

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2011 IEEE International Conference on robotics and Biomimetics, ROBIO 2011

作者： Yuan, Shuai Liu, Lianqing Wang, Zhidong Xi, Ning Wang, Yuechao Dong, Zaili Wang, Zhiyu Wang, Zhibo State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Shenyang Liaoning Province 110016 China College of Information and Control Engineering Shenyang Jianzhu University Shenyang 110168 China Graduate School of Chinese Academy of Sciences Beijing 100001 China Department of Electrical and Computer Engineering Michigan State University East Lansing MI 48823 United States Department of Advanced Robotics Chiba Institute of Technology Chiba Japan

ISBN: (纸本)9781457721373

The spatial uncertainties of tip positioning due to the nonlinearity of the PZT scanner and thermal drift hinder the further application of the AFM based nanomanipulation. This paper brings forward feature referenced tip localization enhanced by probability motion model to reduce the spatial uncertainties. An improved motion model is probabilistically built by incorporating the PI model, the creep model and the thermal drift model. For calibrating the accurate model parameters, the statistical experiments are designed and performed. Then the tip position is optimally estimated by combining with a local scan based feature sensing method. The simulation and corresponding experiments are performed to illustrate the validity and feasibility of the calibrated parameters and the algorithm. © 2011 IEEE.

关键词： Micromanipulators

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Energy-Efficient Scheduling Algorithms for Periodic Power Management for Real-Time Event Streams

Energy-Efficient Scheduling Algorithms for Periodic Power Ma...

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IEEE International Conference on Embedded and Real-Time Computing Systems and Applications (RTCSA)

作者： Kai Huang Jian-Jia Chen Lothar Thiele fortiss GmbH Munich Germany Institute for Process Control and Robotics Karlsruhe Institute of Technology Germany ETH Zurich Computer Engineering and Networks Laboratory Switzerland

As modern VLSI technology is scaling to the deep sub-micron domain, embedded systems face a power-efficiency problem, i.e., static power consumption caused by the leakage current. This paper explores how to use dynamic power management to reduce static power consumption while guaranteeing hard real-time properties. To tackle event arrivals with non-deterministic patterns, the arrival curve model is adopted to describe event arrivals in the interval domain. To reduce runtime overhead, periodic power management is investigated, which turns on and off a system with a fixed period. To reduce the timing complexity of computing such a periodic scheme, two algorithms, which are based on a linear-segmented representation of the arrival curve model, are proposed to trade the complexity with accuracy for energy reduction. We also present simulation results to demonstrate the effectiveness of our algorithms.

关键词： Power demand Real time systems Computational modeling Silicon Approximation algorithms Energy consumption Timing

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Adaptive output-feedback control of planar hybrid step motors using position-only feedback

Adaptive output-feedback control of planar hybrid step motor...

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International Conference on control and Automation (ICCA)

作者： P. Krishnamurthy F. Khorrami Control/Robotics Research Laboratory (CRRL) Department of Electrical and Computer Engineering Polytechnic Institute of New york University Brooklyn NY USA

In this paper, the design of a nonlinear robust adaptive dynamic output-feedback controller for voltage-fed dual-axis linear stepper (Sawyer) motors is addressed using a detailed motor model with electrical dynamics and significant uncertainties and disturbances. The proposed controller utilizes only position measurements in each axis, and achieves practical stabilization of position tracking errors. Velocity and current measurements are not required for feedback. Furthermore, the only electromechanical motor parameter that is required to be known is the time constant of the electrical subsystem. Adaptations are utilized to remove requirement of knowledge of any other electromechanical system parameters. The controller is robust to load torques, friction, cogging forces, and other disturbances satisfying certain bounds. The controller also corrects for the yaw rotation to achieve synchrony of motor and rotor teeth.

关键词： Permanent magnet motors Reluctance motors Observers Force Windings Robustness Current measurement

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Adaptive backstepping and θ-D based controllers for a tilt-rotor aircraft

Adaptive backstepping and θ-D based controllers for a tilt-...

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Mediterranean Conference on control and Automation (MED)

作者： P. Krishnamurthy F. Khorrami Control/Robotics Research Laboratory (CRRL) Department of Electrical and Computer Engineering Polytechnic Institute of New york University Brooklyn NY USA

The robust adaptive control of tilt-rotor aircraft is addressed using backstepping and θ-D based control design techniques. The designs specifically focus on providing high robustness to time-varying system parameters and disturbance effects from the environment to attain good disturbance attenuation properties in highly aerodynamically challenging environments such as shipboard environments. The control system is structured with a modular architecture combining adaptive backstepping and adaptive θ-D control algorithms and provides flexibility and customizability for various tilt-rotor aircraft configurations and operating environments. The overall control system and its constituent algorithms are designed to either be able to operate on their own to provide fully autonomous flight or to operate in conjunction with a human pilot or an existing baseline controller in a control augmentation fashion to provide additional robustness and reliability improvements under severe aerodynamic disturbance conditions. The robustness, stability, and performance of the proposed control algorithms are demonstrated through simulation based studies.

关键词： Aerodynamics Aircraft Rotors Atmospheric modeling Attitude control control design

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Parallel estimation of the cost function for the flexible scheduling problemI

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Procedia computer Science 2011年 4卷 2236-2245页

作者： Wojciech Boźejko Mariusz Uchroński Mieczysław Wodecki Institute of Computer Engineering Control and Robotics Wrocław University of Technology Janiszewskiego 11-17 50-372 Wrocław Poland Institute of Computer Science University of Wrocław Joliot-Curie 15 50-383 Wrocław Poland

The aim of this paper is to show how to determine the neighborhood of the complex discrete optimization problem and how to search it in the parallel environment, this being illustrated by an example of the hybrid scheduling, more precisely a flexible job shop problem. We present a parallel single-walk approach in this respect. A theoretical analysis based on PRAM model of parallel computing has been made. We propose a cost-optimal method of neighborhood generation parallelization.

关键词： parallel algorithm scheduling flexible job shop metaheuristics

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