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System of setting calculation and simulation of relaying protection on local power network

System of setting calculation and simulation of relaying pro...

引用

8th International conference on Electronic Measurement and Instruments

作者： Zhang Qing Shi Junwei Liu Tianying Hou Chenwei Mechanical and Electrical Engineering Institute Hebei Agricultural University China Modern Education and Technology Centre Hebei Agricultural University China

ISBN: (纸本)1424411351

According to the running condition of local power network at present, system of setting calculation and simulation of relaying protection is developed for power system based on graphic modeling. It makes use of graphical software to complete data and process management, fault analysis of power network, setting and simulation of fixed value. By building all kinds of calculation models of running method, setting calculation can be achieved in both automatic and semi-automatic calculation. Through the control of calculation process and the experience of setting engineer, it optimizes the setting value of relaying protection equipments in different ranks of power network by virtue of setting procedure, achieving the optimal setting scheme in different structures of power network and running modes. Setting the running mode in main wiring diagram, random fault, fault point and simulation time, software is designed to simulate the fault calculation and logical decision automatically, making sure the action of relaying protection and tripping out the corresponding circuit breaker. As the base of whole system analysis, graphic system is developed in Visual C++ and Microsoft Access with adoption of the object-oriented ideas. Having such excellent features as visualization and modularization, the whole system is easy to expand and maintain.

关键词： relaying protection setting calculation fault analysis system simulation data management

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Holographic image acquisition and remote underwater visualization

Holographic image acquisition and remote underwater visualiz...

引用

Oceans 2007 Europe International conference

作者： Benzie, Philip Sun, Hongyue Watson, John Univ Aberdeen Univ London Kings Coll Sch Engn Aberdeen AB24 3UE Scotland

ISBN: (纸本)9781424406340

Currently there are two approaches to large volume data retrieval for underwater holography: optical methods using high resolution emulsions and digital holography. Underwater digital holography has enabled high resolution real-time data to be obtained with depths-of-field otherwise unobtainable by conventional non-holographic optical techniques. However, conventional emulsion methods provide large volume retrieval at a superior resolution. This paper will discuss a twin camera automated image retrieval system for in-line emulsion holographic reconstruction and future alternative real-time reconstruction methods using digital holography. In both techniques image acquisition and data retrieval from reconstructed holograms presents a number of challenges that hinder the ability to readily extract information. The application of holography to store high resolution three-dimensional data for large volumes is well understood, however here also belies a problem for data retrieval and large information storage, the data extraction is time-consuming and requires manual intervention. The automated holographic reconstruction system has been developed to aid the analysis, databasing and identification of objects captured by in-line holography. Whereas, the digital off-axis system presents an alternative real-time visualisation approach for underwater analysis. Digital off-axis real-time reconstruction will be presented using numerical pre-processing of captured holograms for data extraction and visualization using a spatial light modulator (SLM). This method has the advantage of recording surface information and optimizing the recording quality of holograms in-situ without the necessity of numerical post-processing. Preliminary experimental research has demonstrated optical and numerical reconstructions at interactive frame rates. Observed interlacing artifacts caused by the CCD camera used are presented and discussed. Optical and numerical reconstructions are presented using

关键词： holography

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Visualizing trends in knowledge management

引用

2nd International conference on Knowledge Science, Engineering Management

作者： Lee, Maria R. Chen, Tsung Teng Shih Chien Univ Dept Informat Management Taipei 104 Taiwan Natl Taipei Univ Grad Sch Informat Management Taipei 104 Taiwan

ISBN: (纸本)9783540767183

Knowledge visualization is a creative process, but difficult to formalize. This paper presents a system that is capable of analyzing voluminous citation data and visualizing the result. The system offers visualizations of trends by clustering scientific papers taken from the web (CiteSeer papers). Two methods are implemented: factor analysis and PFNET. An experiment has been carried out with the literature in knowledge management. A deep analysis of current trends in KM is then performed to check the relevance of these results. While the topical content is specific to knowledge engineering, semantic web, and related sub-areas, the approach could be applied to any general topic area in AI.

关键词： knowledge management knowledge visualization factor analysis PFNET

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High Dynamic Range Preserving Compression of Light Fields and Reflectance Fields 07

High Dynamic Range Preserving Compression of Light Fields an...

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5th International conference on Virtual Reality, Computer Graphics, visualization and Interaction in Africa

作者： Menzel, Nicolas Guthe, Michael Univ Marburg FB 12 D-35032 Marburg Germany

ISBN: (纸本)9781595939067

Surface structures at meso- and micro-scale are almost impossible to convincingly reproduce with analytical BRDFs. Therefore, image-based methods like light fields, surface light fields, reflectance fields and bidirectional texture functions became widely accepted to represent spatially nonuniform surfaces. For all of these techniques a set of input photographs from varying view and/or light directions is taken that usually by far exceeds the available graphics memory. The recent development of HDR photography additionally increased the amount of data generated by current acquisition systems since every image needs to be stored as ail array of floating point numbers. Furthermore, statistical compression methods - like principal component analysis (PCA) that are commonly used for compression are optimal for linearly distributed values and thus cannot handle the high dynamic range radiance values appropriately. In this paper, we address both of these problems introduced by the acquisition of high dynamic range light and reflectance fields. Instead of directly compressing the radiance data with a truncated PCA, a non-linear transformation is applied to input values in advance to assure an almost uniform distribution. This does not only significantly improve the approximation quality after an arbitrary tone mapping operator is applied to the reconstructed HDR. images, but also allows to efficiently quantize the principal components and even apply hardware-supported texture compression without much further loss of quality. Thus, in addition to the improved visual quality, the storage requirements are reduced by more than an order of magnitude.

关键词： Principal component analysis

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Novel collaborative automated testing framework using DDF

Novel collaborative automated testing framework using DDF

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4th International conference on Cooperative Design, visualization, and Engineering

作者： Pei, Songwen Wu, Baifeng Yu, Qiang Zhu, Kun Fudan Univ Dept Comp & Informat Technol Shanghai 200433 Peoples R China

ISBN: (纸本)9783540747796

Collaborative testing is an effective way of distributed interoperability in pursuit of automated testing. In this paper, a novel collaborative testing approach named Collaborative Automated Testing Framework (CATF) which meets the requirements of not only automated testing but also collaborative operation is proposed. Through the abstract analysis in, terms of extended dynamic dataflow (DDF) model's viewpoint incorporating with UML2.0 profile of MDA, we design the framework with an automated engine working as a Finite State Machine (FSM). Particularly, as a approach to collaborative testing at a system level, CATF is implemented with component modules based on J2EE and verified to be of efficiency.

关键词： data flow analysis

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Transient stability boundary visualization for power system

Transient stability boundary visualization for power system

引用

2006 International conference on Power System Technology, POWERCON2006

作者： Zhihong, Yu Xiaoxin, Zhou Zhongxi, Wu IEEE Qinhe Beijing 100085 China CEPRI Qinhe Beijing 100085 China

ISBN: (纸本)1424401119

In terms of monitored operational information, a visual transient stability assessment (TSA) approach is presented to power system. In the procedure, the initial high-dimensional operation data points are projected into an intuitively understandable graphical representation with two-dimensional visualization. Moreover, the data with different operation states are divided into two clusters. One is the stable cluster, and the other is the unstable cluster. Consequently, the operation points and the stability boundary can be strongly apparent on the two-dimensional displays after the mapping. In order to improve the performance of visualization, some data compression techniques are applied in the paper. To an unseen operation point, its status could be decided easily and quickly according to the boundary and its position in the projected space. The proposed method is designed to be applicable for any power system. The assessments of the transient stability for the IEEE 10-machine 39-bus system and a real large-scale power system, 4267-bus State Grid of China system, are used to demonstrate the validity of the approach. © 2006 IEEE.

关键词： Transient analysis

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Enhanced visual separation of clusters by M-mapping to facilitate cluster analysis

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9th International conference on Visual Information Systems

作者： Zhang, Ke-Bing Orgun, Mehmet A. Zhang, Kang Macquarie Univ Dept Comp N Ryde NSW 2109 Australia Univ Texas Dallas Dept Comp Sci Richardson TX USA

ISBN: (纸本)9783540764137

The goal of clustering in data mining is to distinguish objects into partitions/clusters based on given criteria. visualization methods and techniques may provide users an intuitively appealing interpretation of cluster structures. Having good visually separated groups of the studied data is beneficial for detecting cluster information as well as refining the membership formation of clusters. In this paper, we propose a novel visual approach called M-mapping, based on the projection technique of HOV3 to achieve the separation of cluster structures. With M-mapping, users can explore visual cluster clues intuitively and validate clusters effectively by matching the geometrical distributions of clustered and non-clustered subsets produced in HOV3.

关键词： cluster analysis visual separability visualization

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A novel architecture for the classification and visualization of sequential data

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8th International conference on Adaptive and Natural Computing Algorithms (ICANNGA)

作者： Couchet, Jorge Ferreira, Enrique Fonseca, Andre Manrique, Daniel Univ ORT 11100 Cuareim Montevideo 1451 Uruguay Univ Catolica Uruguay Montevideo Uruguay Univ ORT Montevideo Uruguay Univ Politecn Madrid Madrid Spain

ISBN: (纸本)9783540715894

This paper(1) introduces a novel architecture to efficiently code in a self-organized manner, data from sequences or a hierarchy of sequences. The main objective of the architecture proposed is to achieve an inductive model of the sequential data through a learning algorithm in a finite vector space with generalization and prediction properties improved by the compression process. The architecture consists of a hierarchy of recurrent self-organized maps with emergence which performs a fractal codification of the sequences. An adaptive outlier detection algorithm is used to automatically extract the emergent properties of the maps. A visualization technique to help the analysis and interpretation of data is also developed. Experiments and results for the architecture are shown for an anomaly intrusion detection problem.

关键词： Computer architecture

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Applying 2D/3D visualization technology in construction education: A case study

Applying 2D/3D visualization technology in construction educ...

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114th Annual ASEE conference and Exposition, 2007

作者： Gao, Zhili Varma, Virendra Asa, Eric North Dakota State University United States Department of Construction Management and Engineering North Dakota State University United States Department of Construction Management and Engineering 120 CME Building Fargo ND 58105 United States Missouri Western State University United States Department of Engineering Technology Missouri Western State University United States Department of Engineering Technology Wilson Hall 4525 Downs Dr. St. Joseph MO 64507 United States

Analytical principles of mechanics and strength of materials introduce students of construction at the sophomore or junior level to the fundamental principles involved in the analysis and design of typical components of structures. Unfortunately, students find it difficult to relate the external forces on a structural element, such as beams, ties, and columns, to the internal forces and deformations of that element. Research shows that computer-based Two-Dimensional/ThreeDimensional (2D/3D) visualization techniques offer new capabilities that can enhance a student's understanding of how structures behave under various types of loading. For instance, computer animation programs allow processes of mechanics to be shown in motion. This paper reports the results of a study on the application of 2D/3D visualization techniques in the teaching of a course in mechanics of materials to the sophomore-level construction students. The main purpose of this study was to evaluate the suitability of 2D/3D visualization techniques toward development of construction students' understanding of structural response to different loads. The impact on student outcomes and future learning environment is also a part of the targeted data as more new technologies, media and tools become available to teach a new generation of students. Students enrolled in the course participated in a survey and provided their evaluations and comments on both the traditional and 2D/3D visualization methods of teaching. The methodology and data of this process may be used for other construction engineering or technology courses in the future. © American Society for Engineering Education, 2007.

关键词： Engineering education

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Processing of volumetric data by slice- and process-based streaming 07

Processing of volumetric data by slice- and process-based st...

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Afrigraph 2007: 5th International conference on Virtual Reality, Computer Graphics, visualization and Interaction in Africa

作者： Varchola, Andrej Vaško, Anton Solcány, Viliam Dimitrov, Leonid I. Šrámek, Miloš Austrian Academy of Sciences Vienna Austria Komensky University Bratislava Slovakia

ISBN: (纸本)9781595939067

Although the main memory capacity of modern computers is constantly growing, the developers and users of data manipulation and visualization tools fight all over again with the problem of its short-age. In this paper, we advocate slice-based streaming as a possible solution for the memory shortage problem, in the case of preprocessing and analysis of volumetric data defined over Cartesian, regular and other types of structured grids. In our version of streaming, data flows through independent processing units-filters-represented by individual system processes, which store each just a minimal fraction of the whole data set, with a slice as a basic data entity. Such filters can be easily interconnected in complex networks by means of standard interprocess communication using named pipes and. are executed concurrently on a parallel system without a requirement of specific modification or explicit parallelization. In our technique, the amount of stored data by a filter is defined by the algorithm implemented therein, and is in most cases as small as one data slice or only several slices. Thus, the upper bound on the processed, data volume is not any more defined by the main memory size but is shifted to the disc capacity, which is usually orders of magnitude larger. We propose implementations of this technique for various point, local and even global data processing operations, which may require multiple runs over the input data or eventually temporary data buffering. Further, we give a detailed performance analysis and show how well this approach fits to the current trend of employing cheap multicore processors and multiprocessor computers. Copyright © 2007 by the Association for Computing Machinery, Inc.

关键词： Complex networks

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