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2012 13th International Carpathian control Conference, ICCC 2012

作者： DrĄg, Pawel Zelazny, Dominik Institute of Computer Engineering Control and Robotics Wroclaw University of Technology Janiszewskiego 11/17 50-372 Wroclaw Poland

ISBN: (纸本)9781457718687

In the paper we present a new method for solving optimal control problems of a class of hybrid systems. We describe the new effective algorithm based on memetic algorithm (MA) for optimal control of switched systems. We concentrate on a class of problems in which a pre-specified sequence of active subsystems is known. Our aim is to find both the optimal switching instants and the optimal continuous inputs. The new approach, which we propose, decomposes the cost functional of the basic optimal control problem in Bolza form in two terms. The first term depends explicitly on a value of state variables at the final time. The second term depends on state and control trajectories. In oreder to solve those two tasks we used MA as the multi-objective optimization algorithm. In this paper we considered a fundamental bi-criteria case with two mentioned before functions: the value of state variables at the final time and the state and control trajectories. In order to find an approximation of Pareto frontier, we proposed new effective method based on genetic algorithm (GA) and local search (LS). Problems properties were taken into consideration in the design of our new approach of solving it. They were used to construct new algorithm inspired by the LS NSGA-II, which performed rather well in multi-criteria scheduling problem. Since simple genetic algorithms are efficient heuristics in searching for optimal solutions, but lack the accuracy of some more computational complex algorithms, a hybrid algorithm was constructed. It uses fast non-dominated sorting, in order to evaluate child population and allocate solutions to corresponding Pareto frontiers. I addition a local search method was used, in order to find more differentiated and better solutions. Clustering solutions from Pareto frontiers also improved diversity of solutions in child population. This approach can be used as a start point for searching for algorithm for solving optimal control problems of switched systems wi

关键词： Hybrid systems

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Topographic map object classification using real-value grammar classifier system

Topographic map object classification using real-value gramm...

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1st Indo-Japan Conference on Perception and Machine Intelligence, PerMIn 2012

作者： Cielecki, Lukasz Institute of Computer Engineering Control and Robotics Wroclaw University of Technology Wybrzeze Wyspianskiego 27 50-370 Wroclaw Poland

ISBN: (纸本)9783642273865

Learning Classifier Systems (LCS) became a large branch of machine learning applications that received a lot of attention recently. Our model of LCS - rGCS or real-value Grammar Classifier System - uses grammar inference to classify real-value vectors which may describe range variety of problems. In this paper we utilize the rGCS core in an object recognition task. Our application seeks for certain graphic symbols on a topographic map scan. © 2012 Springer-Verlag.

关键词： Object recognition

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Nonparametric identification of nonlinearity in wiener-hammerstein systems

Nonparametric identification of nonlinearity in wiener-hamme...

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9th International Conference on Informatics in control, Automation and robotics, ICINCO 2012

作者： Mzyk, Grzegorz Institute of Computer Engineering Control and Robotics Wroclaw University of Technology Wybrzeze Wyspianskiego 27 50-370 Wroclaw Poland

ISBN: (纸本)9789898565211

In the paper we recover the static characteristic of Wiener-Hammerstein (sandwich) system from inputoutput data. The system is excited and disturbed by random processes with arbitrary distribution. Two kernel-based estimates are proposed and compared. It is shown that they can successfully recover the system characteristic under small amount of a priori information about the static characteristic and the surrounding dynamic blocks. The identified nonlinear function is not parametrized and is not assumed to be invertible, which is common restriction in the literature. The orders of linear dynamic blocks are also unknown. The convergence of the estimates take place for the points in which the input probability density function in positive. The effectiveness of the algorithms is illustrated in simulation example. Copyright © 2012 SciTePress.

关键词： Random processes

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An efficient algorithm for finding minimal cycle time in cyclic job shop scheduling problem

An efficient algorithm for finding minimal cycle time in cyc...

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IEEE 16th International Conference on Intelligent engineering Systems, INES 2012

作者： Smutnicki, Czeslaw Wroclaw University of Technology Institute of Computer Engineering Control and Robotics Janiszewskiego 11-17 50-372 Wroclaw Poland

ISBN: (纸本)9781467326957

We consider the cyclic production system providing on output the mixture of various products. Each product is produced by certain chain of operations, i. e. the unique sequence followed from the technological order. Each operations is performed on the dedicated machine. This sequence of operations is called the job. The aim is to find the cyclic schedule ensuring minimal cycle length. The problem belongs to deterministic scheduling theory, appears with the name cyclic job shop scheduling problem, is strongly NP-hard, and has been analyzed very rarely in the literature. Methodology of designing efficient optimization procedures for hard scheduling problem refers commonly to the component subproblem, namely the problem of finding cycle time or minimal cycle time for fixed job sequence. Numerical properties of this method have crucial influence on the quality of the final optimization algorithm. In this paper we propose several algorithms to solve the problem of finding cycle time for fixed job sequence. Then, we discuss and examine theoretical as well as numerical properties of these algorithms. Obtained results are illustrated by wide results of computational tests. © 2012 IEEE.

关键词： Scheduling algorithms

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Fast model order selection of the nonlinearity in Hammerstein systems

Fast model order selection of the nonlinearity in Hammerstei...

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2012 13th International Carpathian control Conference, ICCC 2012

作者： Mzyk, Grzegorz Institute of Computer Engineering Control and Robotics Wroclaw University of Technology Wybrzeze Wyspiańskiego 27 50-370 Wroclaw Poland

ISBN: (纸本)9781457718687

In the paper we show a new three-stage algorithm identifying the Hammerstein system nonlinearity. The algorithm is designed to work when a poor a priori knowledge is available and when the measurement data set is small. In the first stage, a deconvolution routine is applied to output signal in order to diminish a (usually) harmful influence of the linear dynamic component. Such filtered output is then used in a standard nonparametric estimate (be it kernel or orthogonal series one) to recover the unknown characteristics. Finally, the results of nonparametric estimation are used in the algorithm selecting the best parametric model. The entire proposed approach is illustrated by the simulation example. © 2012 IEEE.

关键词： control nonlinearities

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Application of B-splines in modelling anatomic shapes from CT scans

Application of B-splines in modelling anatomic shapes from C...

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IEEE 16th International Conference on Intelligent engineering Systems, INES 2012

作者： Wytyczak-Partyka, Andrzej Klempous, Ryszard Institute of Computer Engineering Control and Robotics Wroclaw University of Technology 27 Wybrzeze Wyspianskiego st. 50-370 Wroclaw Poland

ISBN: (纸本)9781467326957

The paper shows several methods employed in a semi-automatic pipeline for 3D surface reconstruction of anatomic shapes from Computed Tomography scans. Main benefits of the approach are very little human involvement and high processing speed, while maintaining high reconstruction accuracy. Several filtering methods are described that make contour segmentation easier. Further improvements of the algorithm are proposed. © 2012 IEEE.

关键词： computerized tomography

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Equivalent circuit simulation model of cantilevered piezoelectric bimorph energy harvester

Equivalent circuit simulation model of cantilevered piezoele...

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2011 International Conference on Mechanical engineering, Materials and Energy, ICMEME 2011

作者： Wang, Hongyan Shan, Xiaobiao Xie, Tao State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin 150001 China College of Computer and Control Engineering Qiqihar University Qiqihar 161006 China

ISBN: (纸本)9783037853405

This paper presented an equivalent circuit simulation model of the cantilevered piezoelectric bimorph energy harvester for predicting the electrical power output of the energy harvester. The alternating voltage in the equivalent circuit model is identified from FE transducer model and the parameters of the resistance, capacitance and inductance in the equivalent circuit model are identified from FE actuator model. To valid the equivalent circuit simulation model, the power output values are compared with those obtained from the coupled piezoelectric-circuit finite element analysis. The results demonstrate the accuracy of the equivalent circuit simulation model. © (2012) Trans Tech Publications, Switzerland.

关键词： Equivalent circuits

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Complex impedance matching for power improvement of a circular piezoelectric energy harvester

Complex impedance matching for power improvement of a circul...

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2011 International Conference on Mechanical engineering, Materials and Energy, ICMEME 2011

ISBN: (纸本)9783037853405

The impedance matching and the optimization of power from a circular piezoelectric energy harvester with a central-attached mass are studied. A finite element model is constructed to analyze the electrical equivalent impedance of the circular piezoelectric energy harvester. Furthermore, the complex conjugate matching load is used to extract the maximum output power of the energy harvester. The power output from complex conjugate matching load is compared with the power output from the resistive matching load and a constant resistance, separately. The results suggest that the complex conjugate matching can result in a significant increase of the output power for all frequencies. The effective bandwidth of the piezoelectric energy harvester is extended significantly. © (2012) Trans Tech Publications, Switzerland.

关键词： Finite element method

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ESICM LIVES 2016: part one Milan, Italy. 1-5 October 2016 Abstracts

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INTENSIVE CARE MEDICINE EXPERIMENTAL 2016年第SUPPL 1期4卷 1-1页

作者： [Anonymous] Academic Medical Center University of Amsterdam Amsterdam Netherlands UMCU Utrecht Netherlands Autonomous University of Barcelona Barcelona Spain Hospital São Francisco Xavier Lisbon Portugal CHU Henri Mondor Medical ICU Créteil France Université de Paris Est-Créteil Groupe de Recherche Clinique CARMAS Créteil France Hôpital Tenon APHP Medical and Surgical ICU Paris France Université Paris Diderot Sorbonne Paris Cité UMR 1153 Paris France Interdepartmental Division of Critical Care University of Toronto Toronto Canada University Health Network University of Toronto Critical Care Medicine Toronto Canada University of Milan - Bicocca Health Sciences School of Medicine and Surgery Monza Italy St Michael’s Hospital University of Toronto Anesthesia Toronto Canada CHU d’Angers Medical ICU Angers France Interdepartmental Division of Critical Care University of Toronto Saint Michael’s Hospital and Keenan Research Centre Toronto Canada University of Birmingham Institute for Inflammation and Ageing Birmingham UK University of Sheffield Mathematics and Statistics Help Centre Sheffield UK Heart of England NHS Foundation Trust Intensive Care Medicine Birmingham UK Department of Surgery University Hospitals Birmingham NHS Trust Birmingham UK University Hospitals Birmingham NHS Trust Anaesthesia and Critical Care Medicine Birmingham UK Queen’s University of Belfast Wellcome-Wolfson Institute for Experimental Medicine Belfast UK Royal Victoria Hospital Intensive Care Medicine Belfast UK University of Warwick Warwick Clinical Trials Unit Coventry UK University of Bari ‘Aldo Moro’ Bari Italy Hospital Israelita Albert Einstein São Paulo Brazil Mayo Clinic Jacksonville USA Mahidol University Faculty of Tropical Medicine Bangkok Thailand University Medical Center Utrecht Intensive Care Utrecht Netherlands University Medical Center Utrecht Julius Center for Health Sciences and Primary Care Utrecht Netherlands Academic Medical Center University of Amste

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Design of a Novel Flexible 4-moduli RNS and Reverse Converter

Design of a Novel Flexible 4-moduli RNS and Reverse Converte...

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IET Irish Signals and Systems Conference

作者： Marcin Wesolowski Piotr Patronik Krzysztof Berezowski Janusz Biernat The Institute of Computer Engineering Control and Robotics Wroclaw University of Technology

ISBN: (纸本)9781629935867

In this paper we propose a new 4-moduli Residue Number System (RNS) {2~k, 2~n - 1, 2~(n-1) - 1, 2~(n+1) - 1} and its respective reverse converter. The new moduli set is characterized by a very efficient way of utilizing the underlying representation's capacity coming from its two aspects. First, by not including conjugate moduli our set covers the dynamic range of the representation much better than the systems that do include conjugate moduli. Second, independent controlling parameters of the even and odd moduli allow for fine-grained adjustment of the dynamic range to the needs of specific application with a single bit resolution. Our converter capitalizes on the mixed-radix conversion technique augmented to obtain a compact architecture and to reduce critical path delay by careful decomposition of the computations into cricital and non-critical chunks. The synthesis experiment conducted on a 16-tap programmable FIR filter example using STMicro 65nm low-power library shows up to 11.5% improvement in power dissipation against competitive flexible moduli set.

关键词： computer arithmetic Residue number systems VLSI circuits

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