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13th IFAC Symposium on System Identification, SYSID 2003

作者： McKelvey, Tomas Rylander, Thomas Viberg, Mats Dept. of Signals and Systems Chalmers University of Technology GothenburgSE -412 96 Sweden Center for Computational Electromagnetics Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign UrbanaIL61801-2991 United States

Computational electromagnetics deals with the problem of finding efficient and reliable solutions of Maxwell's equations. This is important in a variety of practical applications, such as antenna design and automatic target recognition, and time-domain computations are attractive for a large class of these problems. However, one is more often interested in the frequency characteristics of the solution. Using the Fourier transform to determine the resonance frequencies and damping factors requires long time series. implying severe computational complexity. An attractive alternative is to apply high-resolution frequency estimation, developed in the signal processing society over the past few decades. This is a challenging problem. though. as the number of interesting frequency components can be as large as several hundreds. To overcome the difficulties. we propose a frequency-domain subspace method that yields accurate frequency and damping estimates in a selected frequency band. The required electromagnetic simulation time can thereby be reduced by several orders of magnitude. © 2003 International Federation of Automatic Control.

关键词： Frequency estimation

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Localized holographic correlators

Localized holographic correlators

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2003 IEEE LEOS Annual Meeting Conference Proceedings

作者： Karbaschi, Arash Momtahan, Omid Adibi, Ali Javidi, Bahram Sch. of Electrical and Computer Eng. Georgia Institute of Technology Atlanta GA 30332 United States Dept. of Electrical and Systems Eng. University of Connecticut U-157 Storrs CT 06269 United States

An overview is given of a holographic correlator that use localized recording technique. The implementation of this method is based on a gated holographic recording technique such as two-center recording.

关键词： Correlators

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Utilizing Soft Information in Image Decoding

Utilizing Soft Information in Image Decoding

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IEEE第14届国际个人无线移动通信大会

作者： Hannes Persson Anna Brunstrom Tony Ottosson Dept. of Computer Science Karlstad University 651 88 Karlstad Sweden Tony Ottosson Dept. of Signals and Systems Chalmers University of Technology 412 96 Gteborg Sweden Dept. of Computer Science Karlstad University 651 88 Karlstad Sweden Tony Ottosson Dept. of Signals and Systems Chalmers University of Technology 412 96 Gteborg Sweden Dept. of Signals and Systems Chalmers University of Technology 412 96 Gteborg Sweden

This paper explores the utilization of soft information in image decoding. Error free transmission is not always possible in today’s nor future’s communication networks without retransmissions. Ret

关键词： soft information image coding JPEG2000

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Automatic generation of PLC programs for control of flexible manufacturing cells

Automatic generation of PLC programs for control of flexible...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： J. Richardsson M. Fabian Control and Computer Systems Volvo Car Corporation Göteborg Sweden Dept. of Signals and Systems Chalmers University of Technology Göteborg Sweden

Shortened product life-cycles decrease the output rate of manufacturing systems. Offline verification of the control systems promises to increase the output. However, to make offline verification possible some major improvements of the current development process of manufacturing systems are needed. Information handling and development of control programs based on information reuse are the two most important improvement areas. This paper deals with one problem up the many connected to enabling offline verification. A general control program structure, adapted to information reuse and formal mathematical verification methods, is needed. This paper proposes a program structure that makes it possible to generate the PLC-program out of information that already exists in the development process of a manufacturing system. In order to further increase the ability of offline verification the proposed program structure is adapted to import information processed by formal mathematical methods.

关键词： Programmable control Automatic generation control Flexible manufacturing systems Manufacturing automation Automatic control Control systems Manufacturing systems computer aided manufacturing Production computer bugs

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Investment decision analysis - A case study at SCA transforest

Investment decision analysis - A case study at SCA transfore...

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Proceedings of the International Conference on Information and Knowledge Engineering 2003

作者： Danielson, Mats Ekenberg, Love Johansson, Jim Larsson, Aron Department of Informatics/ESI Orebro University SE-701 82 Orebro Sweden Dept. of Computer and Systems Sci. Stockholm University Royal Institute of Technology Forum 100 SE-164 40 Kista Sweden Department of Information Technology Mid Sweden University SE-851 70 Sundsvall Sweden

ISBN: (纸本)1932415076

In investment decision-making in organizations, large values can be at stake. The need for a structured process Is evident, not least when several people or interests are involved in the process. We advocate that the use of modern computational decision analysis can improve such investment processes by improving visibility and only requiring reasonably precise input data. The applicability of a structured decision analysis to corporate decision-making is demonstrated in a case study at SCA Transforest, a subdivision to SCA. The decision problem consists of whether a new system for logistic control should be implemented or not. The background information was collected through interviews and the structuring and analysis of the problem was performed using the tool DecideIT, designed for handling situations where uncertainties in input data prevail. The result of the analysis points out a reasonable action, but also shows which aspects are crucial to consider for a reliable result.

关键词： Decision theory

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Evaluating the quality of information models: Empirical testing of a conceptual model quality framework

Evaluating the quality of information models: Empirical test...

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25th International Conference on Software Engineering

作者： Moody, Daniel L. Sindre, Guttorm Brasethvik, Terje Sølvberg, Arne Department of Software Engineering Charles University Praque Czech Republic School of Business Systems Monash University Melbourne Vic. Australia Dept. of Computer and Info. Science Norwegian Univ. Sci. and Technology Trondheim Norway Dept. of Mgmt. Sci. and Info. Syst. University of Auckland Auckland New Zealand

This paper conducts an empirical analysis of a semiotics-based quality framework for quality assuring information models. 192 participants were trained in the concepts of the quality framework, and used it to evaluate models represented in an extended Entity Relationship (ER) language. A randomised, double-blind design was used, in which each participant independently reviewed multiple models and each model was evaluated by multiple reviewers. A combination of quantitative and qualitative analysis techniques were used to evaluate the results, including reliability analysis, validity analysis, interaction analysis, influence analysis, defect pattern analysis and task accuracy analysis. An analysis was also conducted of the framework's likelihood of adoption in practice. The study provides strong support for the validity of the framework and suggests that it is likely to be adopted in practice, but raises questions about its reliability and the ability of participants to use it to accurately identify defects. The research findings provide clear directions for improvement of the framework. The research methodology used provides a general approach to empirical validation of quality frameworks.

关键词： Software engineering

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Adaptive management of Bluetooth master/slave bridge

Adaptive management of Bluetooth master/slave bridge

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IEEE International Conference on Performance, Computing and Communications (IPCCC)

作者： J. Misic V.B. Misic Dept. of Computer Science The Hong Kong University of Science and Technology Hong Kong SAR China Dept. of Information and Systems Management The Hong Kong University of Science and Technology Hong Kong SAR China

Inter-piconet scheduling in a Bluetooth scatternet may be performed in an adaptive manner so as to minimize end-to-end packet delays. Using the theory of queues with vacations, we analyze the impact of different values of scatternet parameters on end-to-end delays, and then investigate the possibility of minimization of the aforementioned delays. We show that such minimization is possible for the scatternet with the master/slave bridge, and that it should be based on inter-piconet traffic. We also describe a simple algorithm that enables the scatternet to achieve near minimum delays in a wide range of traffic parameter values.

关键词： Bluetooth Master-slave Bridges Queueing analysis Personal area networks Delay Topology Scattering Traffic control Switches

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Control of a forced-circulation evaporator system as a case study for control engineering education

Control of a forced-circulation evaporator system as a case ...

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Midwest Symposium on Circuits and systems (MWSCAS)

作者： D. Ibrahim A.H. El Abbass F.N.H. El-deen Electrical Engineering Dept Benha Higher Institute of Technology Egypt Computer & Systems Dept. Electronics Research Institute Faculty of Enginering Helwan University

The forced-circulation evaporator system is used as a case study in this paper. A mathematical nonlinear model is derived and implemented by SIMULINK. Linear model is obtained from linearization of the mathematical equations using MATLAB. Four suggested control algorithms are applied on nonlinear and linear models. The results show that it is a good case study for control education purposes.

关键词： Force control Control systems computer aided software engineering Control engineering education Feeds Water heating Heat transfer Mathematical model Cooling Sugar industry

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Empirical research methods in software engineering

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2003年 2765卷 7-23页

作者： Wohlin, Claes Höst, Martin Henningsson, Kennet Dept. of Software Engineering and Computer Science Blekinge Institute of Technology Box 520 SE-372 25 Ronneby Sweden Dept. of Communication Systems Lund University Box 118 SE-221 00 Lund Sweden

Software engineering is not only about technical solutions. It is to a large extent also concerned with organizational issues, project management and human behaviour. For a discipline like software engineering, empirical methods are crucial, since they allow for incorporating human behaviour into the research approach taken. Empirical methods are common practice in many other disciplines. This chapter provides a motivation for the use of empirical methods in software engineering research. The main motivation is that it is needed from an engineering perspective to allow for informed and well-grounded decision. The chapter continues with a brief introduction to four research methods: controlled experiments, case studies, surveys and post-mortem analyses. These methods are then put into an improvement context. The four methods are presented with the objective to introduce the reader to the methods to a level that it is possible to select the most suitable method at a specific instance. The methods have in common that they all are concerned with quantitative data. However, several of them are also suitable for qualitative data. Finally, it is concluded that the methods are not competing. On the contrary, the different research methods can preferably be used together to obtain more sources of information that hopefully lead to more informed engineering decisions in software engineering. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Motivation

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Experimentation with usage-based reading

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2003年 2765卷 193-207页

作者： Thelin, Thomas Erlansson, Magnus Höst, Martin Wohlin, Claes Dept. of Communication Systems Lund University Box 118 SE-221 00 Lund Sweden Dept. of Software Engineering and Computer Science Blekinge Institute of Technology Box 520 SE-372 25 Ronneby Sweden

Software inspections are regarded as an important technique to detect faults throughout the software development process. The individual preparation phase of software inspections has enlarged its focus from only comprehension to also include fault searching. Hence, reading techniques to support the reviewers on fault detection are needed. Usage-based reading (UBR) is a reading technique, which focuses on the important parts from a user's point of view in a software document by using prioritized use cases. UBR has been evaluated in two previously conducted experiments, which investigate the prioritization of UBR and compare UBR against checklist-based reading (CBR). This chapter presents two controlled experiments with UBR on requirements and design specifications. The experiments include individual preparation and inspection meeting, i.e. the first steps of the traditional inspection process. For the requirements inspection, UBR is evaluated against CBR, and for the design inspection, the amount of information needed in the use cases are studied. The studies were conducted in different environments with a total of about 100 students. The result from these experiments shows that UBR is not better than CBR for requirements inspections. Results from the experiment on design inspection indicate that use cases developed in advance are preferable compared to developing them as part of the preparation phase of the inspection. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Inspection

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