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IEEE International Conference on Industrial informatics (INDIN)

作者： G. Grabmair A. Zoitl T. Strasser R. Froschauer Department for Industrial Informatics University of Applied Science Wels Austria Automation and Control Institute University of Technology Vienna Austria PROFACTOR Produktionsforschungs GmbH Steyr Austria

The complexity of automation and control systems is fast increasing in order to satisfy the arising needs of the manufacturing industry. The central exigencies for new production facilities are flexibility, adaptability and reconfigurability in combination with guarantees for downtime less operation. Additionally modern automation systems are supposed to execute control applications distributed across heterogeneous networks The standard IEC 61499 introduces a function block oriented architecture which should be able to satisfy most of these new requirements. Still some of the open issues within the standards definition are the consideration of real-time constrained applications, the missing possibilities and conventions to define an explicit execution order and the absence of an appropriate modelling technique for real-time constraint specification. Furthermore in case of reconfiguration of control applications similar or different real-time requirements must be fulfilled which have to be considered during the engineering process. Therefore the main topic of this paper discusses investigations on possibilities to define and model real-time constraints within reconfigurable IEC 61499 applications.

关键词： IEC standards Automatic control Timing control systems Manufacturing automation Programmable control Distributed control Electrical equipment industry Manufacturing industries Industrial control

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An Execution Environment for Real-Time Constrained control Software based on IEC 61499

An Execution Environment for Real-Time Constrained Control S...

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IEEE International Conference on Industrial informatics (INDIN)

作者： Alois Zoitl Gunnar Grabmair Rene Smodic Thomas Strasser Automation and Control Institute University of Technology Vienna Vienna Austria Department for Industrial Informatics University of Applied Sciences Wells Australia PROFACTOR Produktionsforschungs GmbH Steyr Austria

The ever increasing complexity of manufacturing systems demands for new real-time control infrastructures. With the new standard IEC 61499 the IEC introduced a base for such a control infrastructure. An open issue of this standard is the missing definition of real-time execution. This work maps existing real-time execution theory to IEC 61499 execution elements deriving the basic element for the new execution approach-the event chain concept. A novel execution environment for an efficient execution of reconfigurable real-time control in IEC 61499 is presented.

关键词： IEC standards Programmable control Application software Delay Manufacturing systems Computer architecture Distributed control Yarn Java Real time systems

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A Distributed Energy Management Approach for Autonomous Power Supply Systems

A Distributed Energy Management Approach for Autonomous Powe...

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IEEE International Conference on Industrial informatics (INDIN)

作者： Ingo Hegny Roland Holzer Gunnar Grabmair Alois Zoitl Franz Auinger Ewald Wahlmuller Automation and Control Institute University of Technology Vienna Vienna Austria Department for Industrial Informatics University of Applied Science Wels Austria Fronius International GmbH Thalheim bei Wels Austria

Currently applied autonomous power supplies are designed for specific energy demands and therefore rather inflexible. For an increased user friendliness, allowing attaching and detaching electrical devices without new load calculations, a flexible Power Distribution System is necessary. This can be reached by applying an Energy Management System. A concept for such a system, that is scalable by distributing it to multiple devices, is presented in this work. Reconfiguration, such as changing the load distribution algorithm, can be realized without downtime. This is possible by implementing the concept as an IEC 61499 application. A field demonstrator is set up using embedded controllers, equipped with a network interface. To perform necessary measurement and switching tasks, an interface board is developed. The desired system behavior, a stable operation of a flexible autonomous power supply system, can be achieved in the simulation on PC hardware as well as on the field demonstrator set up.

关键词： Energy management Power supplies Medical services Power system modeling IEC standards Power system management Power control Power distribution Performance evaluation Hardware

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Off-Line Signature Verification Based on Feature Matching

Off-Line Signature Verification Based on Feature Matching

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IEEE International Conference on Intelligent Engineering Systems (INES)

作者： Bence Kovari Zsolt Kertesz Attila Major Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Hungary Department of Control Engineering and Information Technology Budapest University슠of슠Technology슠and슠Economics Hungary

This paper presents a novel approach for off-line signature verification. First the different aspects and problems of signature verification are discussed in conjunction with off-line analysis methods. It is shown, that on-line analysis methods perform usually better than off-line methods because they can make use of the temporal information (and thereby get a better perception of the semantics of the signature). An assumption is made, that off-line verification methods have difficulties improving their results because of the high level of abstraction they use, which is a direct consequence of the missing semantics. Afterwards a solution is presented with the ability to preserve some semantic information, and thereby deliver a better ability to analyze the results and optimize the system.

关键词： Handwriting recognition Data acquisition Feature extraction Information analysis automation informatics control engineering Information technology Error analysis Law

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Combined Photovoltaic/Thermal Energy System for Stand-alone Operation

Combined Photovoltaic/Thermal Energy System for Stand-alone ...

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2007 IEEE International Symposium on Industrial Electronics (ISIE 2007), vol.6

作者： Rafael K. Jardan Istvan Nagy Angel Cid-Pastor Ramon Leyva Abdelali El Aroudi Luis Martinez-Salamero Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Department of Electrical Electronic and Automatic Control Engineering University of Rovira i Virgili Tarragona Spain Department of Electrical Electronic and Automatic Control Engineering Universitat Rovira i Virgili Tarragona Spain

The utilization of solar energy can be made by photovoltaic (PV) cells to generate electric power directly and solar thermal (T) panels can be applied to generate heat power. When the utilization of the solar energy is necessary to generate electric power, the option of using T panels in combination with some heat/electric power conversion technology can be a viable solution. The power generated by utilizing the solar energy absorbed by a given area of solar panel can be increased if the two technologies, PV and T cells, are combined in such a way that the resulting unit will be capable of co-generation of heat and electric power. In the present paper combined Photovoltaic/Thermal panels are suggested to generate heat power to produce hot water, while the photovoltaic part is used to obtain electric power mainly for covering the electric power consumption of the system, to supply the electronic control units and to operate pump drives etc. Ac and dc supplies are provided by converters for covering self-consumption and possibly the need of some household appliances. The development and design of the system is made by extensive use of modeling and simulation techniques. In the paper a part of the simulation studies, carried out to determine the energy balance in the electric energy conversion section of the system and the control structure, assuming stand-alone operation is presented.

关键词： Photovoltaic systems Solar power generation Power generation Cogeneration Solar energy Solar heating Heat pumps Water heating Temperature control control systems

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COVARIANCE MATCHING CRITERIA IN EIV IDENTIFICATION

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IFAC Proceedings Volumes 2006年第1期39卷 184-189页

作者： István Vajk Jen Hetthéssy Department of Automation and Applied Informatics Budapest University of Technology and Economics HAS-BUTE Control Research Group H 1521 Budapest Hungary

The paper deals with the simultaneous estimation of the process and noise parameters in linear dynamic errors-in-variables models. The presented method is based on the minimization of loss functions to estimate all the parameters in the EIV model. The related loss functions involve Hankel matrices built up by the noisy input-output observations, as well as error covariance matrices taking the assumptions made for the noisy environment into consideration. The theoretical results are verified by simulation examples.

关键词： Linear models errors-in-variables models system identification subspace methods

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Comparison of cluster validation methods

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WSEAS Transactions on Information Science and Applications 2006年第3期3卷 502-509页

作者： Legány, Csaba Juhász, Sándor Babos, Attila Department of Automation and Applied Informatics HAS-BUTE Control Research Group Budapest University of Technology and Economics 1111 Goldmann Gy. ter 3. Budapest Hungary

The main goal of clustering is to partition the elements of a large dataset into separate groups in an unsupervised way. The creation of groups is based on the similarity of objects that is objects with similar properties are kept together while significantly different objects are assigned to different groups. Various algorithms exist that can prove to be efficient in different situations. These algorithms produce different results depending on their structure, on their initial parameters and on the nature of the data being analyzed. This paper focuses on the different techniques developed for evaluating the behavior of the algorithms from the point of view of clustering quality. It is difficult to define when a clustering is appropriate, sometimes even for a human observer. The high number of dimensions, the possibility of arbitrary shaped and overlapping clusters further increase the complexity of the situation. In this paper the most commonly used approaches are introduced and explained, after they are compared based on experimental results.

关键词： Data mining

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Different clustering possibilities used in web usage mining

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WSEAS Transactions on Information Science and Applications 2006年第3期3卷 622-628页

作者： Ivancsy, Renata Kovacs, Ferenc Department of Automation and Applied Informatics HAS-BUTE Control Research Group Budapest University of Technology and Economics Goldmann Gy. ter 3 H-1111 Budapest Hungary

The expansion of the World Wide Web (Web for short) has resulted in a large amount of data that is now in general freely available for user access. The different types of data have to be managed and organized in such a way that they can be accessed by different users efficiently. Therefore, the application of data mining techniques on the Web is now the focus of an increasing number of researchers. Clustering is one of the various type of methods that can be applied on Web data in order to provide more dynamic and user friendly Web-based service. Because the amount of data stored in such Web systems is great in this case the data mining aspects of clustering should be used. This paper deals with the different aspects of Web data mining and provides an overview about the various techniques used in this field.

关键词： Data mining

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Subspace identification methods: Review and re-interpretation

Subspace identification methods: Review and re-interpretatio...

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5th International Conference on control and automation, ICCA'05

作者： Vajk, István Hetthéssy, Jeno Department of Automation and Applied Informatics Budapest University of Technology and Economics HAS-BUTE Control Research Group H 1521 Budapest Hungary

ISBN: (纸本)0780391381

The paper is devoted for a systematic discussion on the subspace based identification methods. The structure of the noise components acting additively at various system signals is considered as the guiding principle for the analysis of the estimation algorithms. It is shown that replacing the state space approach typically applied in this field by a discrete time transfer function system realization the highly involved machinery of the subspace algorithms can be handled in a clearly ordered framework exhibited by a set of over-determined equations to be solved. © 2005 IEEE.

关键词： Identification (control systems)

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Fast discovery of frequent itemsets: A cubic structure-based approach

Fast discovery of frequent itemsets: A cubic structure-based...

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作者： Ivancsy, Renata Vajk, Istvan Department of Automation and Applied Informatics Budapest University of Technology and Economics HAS-BUTE Control Research Group Goldmann Gy. ter 3 H-1111 Budapest Hungary

Mining frequent patterns in large transactional databases is a highly researched area in the field of data mining. The different existing frequent pattern discovering algorithms suffer from various problems regarding the computational and I/O cost, and memory requirements when mining large amount of data. In this paper a novel approach is introduced for solving the aforementioned issues. The contribution of the new method is to count the short patterns in a very fast way, using a specific index structure. The suggested algorithm is partially based on the apriori hypothesis and exploits the benefit of a new index table-based cubic structure to count the occurrences of the candidates. Experimental results show the advantageous execution time behavior of the proposed algorithm, especially when mining datasets having huge number of short patterns. Its memory requirement, which is independent from the number of processed transactions, is another benefit of the new method.

关键词： Data mining

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