Wyniki wyszukiwania - BazTech

1

Ant-based clustering for flow graph mining

Lewicki Arkadiusz, Pancerz Krzysztof

International Journal of Applied Mathematics and Computer Science

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2020

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Vol. 30, no. 3

561--572

EN

The paper is devoted to the problem of mining graph data. The goal of this process is to discover possibly certain sequences appearing in data. Both rough set flow graphs and fuzzy flow graphs are used to represent sequences of items originally arranged in tables representing information systems. Information systems are considered in the Pawlak sense, as knowledge representation systems. In the paper, an approach involving ant based clustering is proposed. We show that ant based clustering can be used not only for building possible large groups of similar objects, but also to build larger structures (in our case, sequences) of objects to obtain or preserve the desired properties.

2

Study of mutual influence of measuring part elements of transformer differential protection and its impact on the primary signal processing

Andreev M., Gusev A., Suvorov A., Ruban N., Ufa R.

Przegląd Elektrotechniczny

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2018

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R. 94, nr 9

71--74

EN

Calculation of relay protection (RP) settings ensuring its adequate functioning under specific operating conditions is extremely difficult task. The main prerequisite for solving this problem is availability of a detailed analysis of functioning of key elements of RPs schemes in the specific conditions of its operation. That is possible to do with adequate RPs mathematical models and modern EPS simulators. Based on developed by authors approach for detailed RPs simulation the models of the whole circuit of measuring part (MP) of numerical transformer differential protection were developed for different types of auxiliary transformers and low-pass filters. A comparative numerical analysis of its impact on the primary signal processing is carried out, including taking into account the magnetization current transformers. Summarizing, the theoretical and practical studies presented in the article allows formulating requirements for RPs’ detailed mathematical models, which will be used in the further research.

PL

W artykule analizoano warunki prawidłowej pracy cyfrowego zabezpieczenia pracy transformatora. W tym celu opracowano model matematyczny układu zabezpieczającego ze szczególnym uwzględnieniem pracy filtru. Przeprowadzono symulacje dla różnych typów zewnętrznego transformatora i filtru dolnoprzepustowego.

3

On the systematic method of conditional control program execution by a PLC

Milik A., Chmiel M., Hrynkiewicz E.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2016

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Vol. 64, nr 1

161--170

EN

The paper presents an original idea of the selective control program execution that allows significant response time reduction. The exhaustive analysis of the PLC program performance is given. An analytic approach explains the idea of the selective control program evaluation and gives the requirements for its feasibility. There is presented a systematic and formal method of program analysis based on a data flow graph approach. The method generates acyclic graph from the control program that is subject of optimization, variable allocation and instruction generation. The graph approach allows determining variables dependencies and task partitioning required by selective program execution. The method utilize the hardware supported variable changes detection. It is transparent for system operation and enables evaluation of blocks that require update.

4

Adaptive Method of Adjusting Flowgraph for Route Reconstruction in Video Surveillance Systems

Czyżewski A., Lisowski K.

Fundamenta Informaticae

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2013

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Vol. 127, nr 1-4

561--576

EN

Pawlak's flowgraph has been applied as a suitable data structure for description and analysis of human behaviour in the area supervised with multicamera video surveillance system. Information contained in the flowgraph can be easily used to predict consecutive movements of a particular object. Moreover, utilization of the flowgraph can support reconstructing object route from the past video images. However, such a flowgraph with its accumulative nature needs a certain period of time for adaptation to changes in behaviour of objects which can be caused, e.g. by closing a door or placing other obstacle forcing people to pass it by. In this paper a method for reduction of time needed for flowgraph adaptation is presented. Additionally, distance measure between flowgraphs is also introduced in order to determine if carrying out the adaptation process is needed.

5

Data analysis and flow graphs

Pawlak Z.

Journal of Telecommunications and Information Technology

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2004

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nr 3

18-22

EN

In this paper we present a new approach to data analysis based on flow distribution study in a flow network. Branches of the flow graph are interpreted as decision rules, whereas the flow graph is supposed to describe a decision algorithm. We propose to model decision processes as flow graphs and analyze decisions in terms of flow spreading in the graph.