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ANALYSIS OF TIMING PROPERTIES OF ELECTRICAL POWER SYSTEM PROTECTION

IFAC Proceedings Volumes 2007年第6期40卷 37-42页

作者： Miroslaw Lukowicz Jan Magott Pawel Skrobanek Institute of Electrical Power Engineering Institute of Computer Science Automatic Control and Robotics Wroclaw University of Technology Wroclaw

In electrical power systems, the coordination of protections in time domain is important and difficult problem. The time settings of protection relays have to be adapted to the time characteristics of electrical power system plants and the delay times of the other protections. In the paper, Fault Trees with Time Dependencies (FTTDs) are used in selection of values of the delay times of primary (local) and remote backup protections. In the FTTD, events and gates are characterized by time parameters. These time parameters are derived from the time characteristics of protection devices and the inherent delay times of protection equipment.

关键词： power system protection distance protection remote backup protection fault detection and isolation fault tree with time dependencies

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Learning Context-Free Grammars from Partially Structured Examples: Juxtaposition of GCS with TBL

Learning Context-Free Grammars from Partially Structured Exa...

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International Conference on Hybrid Intelligent Systems (HIS)

作者： Olgierd Unold Lukasz Cielecki The Institute of Computer Engineering Control and Robotics Wroclaw University of Technology Poland

This paper juxtaposes performance of the grammar- based classifier system (GCS) with tabular representation algorithm (TBL) on the task of inducing context-free grammars from partially structured examples. In both cases structured examples rapidly improve the efficiency of learning algorithms, although there are substantial differences in the way they work. GCS requires more attention while setting initial system parameters and structured examples provide a bit more information than in TBL but on the other hand it is more efficient when tested against the same examples' sets.

关键词： Production systems Learning automata Inference algorithms Partitioning algorithms Hidden Markov models Space exploration Hybrid intelligent systems control engineering computing Robot control control systems

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Error Prevention, Detection and Diffusion Algorithms for Cryptographic Hardware

Error Prevention, Detection and Diffusion Algorithms for Cry...

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International Conference on Dependability of computer Systems (DepCos-RELCOMEX)

作者： Maciej Nikodem Institute of Computer Engineering Control and Robotics Wroclaw University of Technology Poland

It is well known that hardware is susceptible to variety of different faults causing device malfunction, errors in the output or simply destroying the device. These threats refer to any type of hardware. However in case of cryptographic devices, such as smart cards or crypto-processors, errors may also leak some secret information hidden in the device (e.g. encryption keys). This was presented for almost all cryptographic protocols and algorithms allowing an adversary to perform a fault analysis. Therefore it is urgent to propose hardware implementation of cryptographic algorithms that will be immune to this type of attack. Some solutions to this problem have been already proposed for the RSA algorithm based on the Chinese Reminder Theorem and for symmetric algorithms. On the other hand there is a large number of algorithms that are susceptible to fault analysis but no solutions to increase immunity have been proposed so far.

关键词： Cryptography Hardware Error correction Circuit faults Doped fiber amplifiers Fault detection Security Algorithm design and analysis computer errors Radiation detector circuits

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Discrete transport system simulated by SSF for reliability and functional analysis

Discrete transport system simulated by SSF for reliability a...

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International Conference on Dependability of computer Systems (DepCos-RELCOMEX)

作者： Tomasz Walkowiak Jacek Mazurkiewicz Institute of Computer Engineering Control and Robotics Wroclaw University of Technology Wroclaw Poland

A method of reliability and functional analysis related to discrete transport systems is presented. The proposed analysis is based on modeling and simulating of the system behavior. Monte Carlo simulation is used for proper reliability and functional parameters calculation. The simulator is built using Scalable Simulation Framework (SSF). No restriction on the system structure and on a kind of distribution is the main advantage of the method. The paper presents some exemplar system modeling. The authors stress the problem of influence of the reliability parameters for final system functional measures (required time of delivery). They also propose to measure the economic quality of discrete transport system by "profit function". The presented problem is practically essential for defining an organization of vehicle maintenance and transport system logistics.

关键词： Analytical models Functional analysis Vehicles Containers Computational modeling computer simulation Maintenance Logistics Telecommunication network reliability control engineering computing

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Incident Detection and Analysis in Communication and Information Systems by Fuzzy Logic

Incident Detection and Analysis in Communication and Informa...

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International Conference on Dependability of computer Systems (DepCos-RELCOMEX)

作者： Tomasz Walkowiak Tomasz Wilk Institute of Computer Engineering Control and Robotics Wroclaw University of Technology Wroclaw Poland

The paper presents the model of automatic detection system which uses fuzzy logic methodology for intrusion detection and analysis in sophisticated distributed system. The proposed system functions are to detect the occurrence of intrusions, their severity and impact on the system work. The authors indicate that the current system reveals to be experimental in nature. We propose the hierarchical agent architecture to increase the detection response speed and scalability of the system.

关键词： Information analysis Information systems Fuzzy logic Intrusion detection Artificial intelligence Computational Intelligence Society Fuzzy sets Communication system control Scalability Information security

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Output feedback decoupling of neutral time delay systems

Output feedback decoupling of neutral time delay systems

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2007 Mediterranean Conference on control and Automation, MED

作者： Panagiotakis, G.E. Koumboulis, F.N. Paraskevopoulos, P.N. Halkis Institute of Technology Department of Automation 34400 Psahna Evias Greece National Technical University of Athens Division of Signals Control and Robotics Department of Electrical and Computer Engineering 15773 Zographou Athens Greece

ISBN: (纸本)142441282X

The problem of Input Output Decoupling is studied for the case of general neutral multi-delay systems, via proportional realizable output feedback. Using a pure algebraic approach, the necessary and sufficient conditions for the problem to have a realizable solution are established and the general analytical expressions of the proportional realizable controller matrices, are derived. © 2007 IEEE.

关键词： Timing circuits

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Analysis of Timing Requirements for Intrusion Detection System

Analysis of Timing Requirements for Intrusion Detection Syst...

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International Conference on Dependability of computer Systems (DepCos-RELCOMEX)

作者： Jan Magott Pawel Skrobanek Marek Woda Institute of Computer Science Automatic Control and Robotics Wroclaw University of Technology Wroclaw Poland

An intrusion detection system (IDS) is a collection of sensors (often in the form of mobile agents) that collect data (security related events), classify them and trigger an alarm when unwanted manipulations to regular network behaviour is detected. Activities of attackers and network are time dependent. In the paper, fault trees with time dependencies (FTTD) are used to describe intrusions with emphasis put on timing properties. In FTTD, events and gates are characterized by time parameters. FTTD are used in verification whether the IDS reacts sufficiently quick on the intrusions. As an example, "the victim trusts the intruder" attack is analysed.

关键词： Timing Intrusion detection Fault trees Hazards US Department of Transportation Tree graphs Logic computer science Automatic control Mobile robots

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Secure Communication Trees in Ad Hoc Networks

Secure Communication Trees in Ad Hoc Networks

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International Conference and Workshop on Engineering of computer-Based Systems

作者： Jan Nikodem Maciej Nikodem Institute of Computer Engineering Control and Robotics Wrocław University of Technology Wroclaw Poland

In this paper we examine the communication trees widely used in ad hoc networks. These trees can be used in a number of ways e.g. to route or broadcast messages and to aggregate information. In this paper we propose a new key distribution protocol for large and dynamic ad hoc networks over unreliable channel. Protocol proposed here involves broadcast exclusion based on polynomial interpolation and secret key cryptography. Proposed scheme ensures security of broadcast and one-to-one communication, message authentication and gives a possibility to verify routing information. It also ensures t-resilience which means that up to t nodes can be compromised without influencing the security

关键词： Ad hoc networks Broadcasting Cryptographic protocols Information security Aggregates Polynomials Interpolation Cryptography Message authentication Routing

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Securing Communication Trees in Ad Hoc Sensor Networks with Polynomial-Based Key Pre-Distribution

Securing Communication Trees in Ad Hoc Sensor Networks with ...

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IEEE Symposium on computers and Communications (ISCC)

作者： Jan Nikodem Maciej Nikodem Institute of Computer Science Control and Robotics Wrocław University of Technology Wroclaw Poland

There are many applications of ad hoc sensor networks that have to ensure immunity to adversaries. One challenge is how to bootstrap secure communication among nodes. In this paper we propose a novel key pre-distribution scheme based on polynomials. The properties of our scheme are the same as a scheme presented by Blom, but we propose to use a different technique that can be easily extended if we get rid of a node's computation constrains. By using polynomial-based key pre-distribution, we can reduce the storage requried at receivers down to O(t) where t is a system and security parameter. Moreover using only this information, pairwise keys can be established efficiently for each pair of nodes which enable secure construction of the communication tree.

关键词： Polynomials Protocols Proposals Communication system security Wireless sensor networks Routing Data security computer science Robot control Communication system control

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Model matching of SISO neutral time delay systems via output feedback

Model matching of SISO neutral time delay systems via output...

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2007 Mediterranean Conference on control and Automation, MED

作者： Koumboulis, F.N. Kouvakas, N.D. Paraskevopoulos, P.N. Halkis Institute of Technology Department of Automation 34400 Psahna Evias Halkis Greece National Technical University of Athens Division of Signals Control and Robotics Department of Electrical and Computer Engineering 15773 Zographou Athens Greece

ISBN: (纸本)142441282X

The necessary and sufficient conditions for the solvability of the exact model matching problem for general neutral single input - single output multi-delay systems, via a realizable dynamic output feedback and a realizable dynamic precompensator, are established. The general class of the realizable dynamic controllers solving the problem is analytically determined. The results are successfully applied to the model of a cascade connection of two mixers as well as a numerical example. ©2007 IEEE.

关键词： Timing circuits

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