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A new educational set-up for a power engineering laboratory

A new educational set-up for a power engineering laboratory

引用

European conference on Power Electronics and Applications

作者： A. Kuznietsov ZES ZIMMER Electronic Systems GmbH Oberursel Germany

This paper presents a new educational set-up for using in industrial electronics and power engineering laboratory. The presented system consists of a precision power meter, an autonomous data logging unit as well as of application software. It helps students to understand the concepts of power electronic appliances, machines and drives by measuring the typical signals with different filtering and synchronisation tools, visualising the data and investigating the results with analytical models created with Matlabreg and Simulinkreg. The educational kit can present typical waveforms, phasor diagrams, real, active and reactive power and spectral diagrams and can also be used for improved laboratory practice, like investigation of transformers, PWM devices and rotating machines. Additionally there is a possibility to evaluate power quality with statistical and regression analysis

关键词： Power engineering Laboratories Pulse width modulation Industrial electronics Application software Power electronics Home appliances Power measurement Filtering data visualization

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Cerebral vascular atlas generation for anatomical knowledge modeling and segmentation purpose

Cerebral vascular atlas generation for anatomical knowledge ...

引用

conference on Computer Vision and Pattern Recognition (CVPR)

作者： N. Passat C. Ronse J. Baruthio J.-P. Armspach C. Maillot LSIIT UMR 7005 CNRS-ULP Strasbourg University Illkirch-Graffenstaden France IPB UMR 7004 CNRS-ULP Strasbourg University Strasbourg France Institut dAnatomie Normale Strasbourg University Strasbourg France

Magnetic resonance angiography (MRA) is currently used for cerebral flowing blood visualization. Many segmentation methods have been proposed for brain vessel segmentation, in order to help analyzing the huge data (generally more than 10/sup 7/ voxels) provided by MRA acquisitions. Recently, a new family of segmentation algorithms, involving high level anatomical knowledge, has been studied. These new algorithms require a way to model and store this knowledge. An efficient and general approach to reach that goal consists in using atlases. In this paper a method is proposed to create vascular atlases of the brain, containing information useful for vessel segmentation purpose. This atlas creation process, designed for phase-contrast MRA (PC-MRA), is composed of four steps: segmentation, quantification, registration and data fusion. It uses a region-growing algorithm for vessel segmentation, a skeleton and vessel size determination algorithm, based on discrete geometry, for determination of quantitative properties, and a topology preserving non-rigid registration method to fuse the information. This method, which has been applied to a 18 PC-MRA database, enables to create vascular atlases containing information on brain vessels position, density, size and orientation. The generated atlases are essentially devoted to segmentation purpose but can also be used for anatomical description or pathology detection.

关键词： Magnetic resonance Angiography Blood data visualization data analysis Magnetic analysis Process design Skeleton Information geometry Topology

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Discovering ontological semantics for reuse and sharing of learning objects in a contextual learning environment

Discovering ontological semantics for reuse and sharing of l...

引用

International conference on Advanced Learning Technologies (ICALT)

作者： Ching-Chieh Kiu Chien-Sing Lee Faculty of Information Technology Multimedia University Cyberjaya Malaysia

Ontologies enable learning objects sharing and reuse in a contextual learning environment and provide better search and navigation of learning objects. Ontologies add semantics to content components, which provide context to learning objects. This paper presents the use of Formal Concept analysis (FCA) to structure knowledge ontologically and the self-organizing map (SOM) to reduce the problem size. To gain better visualization of the intrinsic relationship between ontological concepts, k-means clustering is applied on the clustered SOM.

关键词： Ontologies Navigation visualization Clustering algorithms Information technology Packaging Vocabulary Learning systems data mining Unsupervised learning

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Visualizing hierachical information using a new focus+context method

Visualizing hierachical information using a new focus+contex...

引用

International conference on Computer and Information Science (ACIS)

作者： Hee Yong Yoo Hee Jin Yoo Department of Computer Engineering Dong-Guk University Department of Computer Science Suncheon First College

This paper reports a new focus+context method for information, which is constructed upon hierarchical structure. The visualization method presented in this paper represents intended to minimize disorientation that a user may have when he or she navigates through node information. This method suggests a structure with which a user can analyze focused node data through adjacent node data when he or she makes a node selection. It is also intended to minimize overlapping and calculation process when a user changes focused node thus causes node data to be restructured. This paper proposes HONG (hierarchies of network and graph) view system in graphics interface environment, which can search and display hierarchical information through suggested new focus+context method.

关键词： data visualization Application software Computer science Educational institutions Navigation data analysis Computer graphics Computer displays Tree graphs Fractals

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Challenging conventions for geovisualization interface design: implications for exploratory data analysis

Challenging conventions for geovisualization interface desig...

引用

International conference on Information Visualisation (IV)

作者： R.M. Edsall Department of Geography Arizona State University USA

The use of interface metaphors and cartographic guidelines for facilitating communication between cartographer and user may serve to limit the power of the system or the representation for a diverse set of users or a diverse set of uses. For example, the data exploration tasks typical of geovisualization systems may be hindered by strict adherence to conventional and/or traditional interface metaphors or cartographic symbolization. Successful design of geovisualization systems, therefore, should take into account factors that are socially and culturally determined and adjust design accordingly dependent on the targeted users or, more importantly, the targeted task (i.e. exploratory data analysis). This paper explores this possibility and presents the results of a pair of human-subjects experiments where some subgroups among the participants were shown non-traditional representations. Results indicate that, for data exploration tasks, designers and users should embrace unconventional designs in order to encourage creative problem solving and hypothesis generation.

关键词： data analysis data visualization Computer displays Cognitive science Geography Guidelines Problem-solving Application software Humans Design methodology

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Remote sensing methods in methodical procedure of qualitative assessment of the forest resources

Remote sensing methods in methodical procedure of qualitativ...

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International conference on Recent Advances in Space Technologies (RAST)

作者： S.R. Ibrahimova Institute of Space Researches of Natural Resources Azerbaijan National Aerospace Agency Baku Azerbaijan

At present an analysis of the processes on the Earth surface with the help of Earth remote sensing is becoming one of the most promising methods. Highly informative data, excellent spatial resolution, required intervals of imaging the area under survey are the available advantages of remote sensing materials. Principle limitations are related to integral and qualitative nature of information on the one hand, and the absence of systemized data on the state of the objects under study on the other hand. Therefore, the process of interpretation gives ambiguous results without a proper ground research. At the same time geoinformation technologies (GIS), which are widely used for describing natural systems provides for the creation of complete spatial-coordinated comprehensive data bases for various resources. GIS main advantage is a possibility of materials spatial analysis. Joint application of these technologies (remote sensing and GIS) gives an instrument for fast and effective solution of a class of missions related to qualitative assessments of natural ecosystem state changes caused by both man-induced and natural factors.

关键词： Remote sensing data visualization Geographic Information Systems Earth Image resolution Photography Shape measurement Statistics Spatial resolution High-resolution imaging

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Learnability of interactive coordinated-view visualizations

Learnability of interactive coordinated-view visualizations

引用

International conference on Information Visualisation (IV)

作者： S. Krishnamoorthy C. North Department of Computer Science Virginia Polytechnic Institute and State University Blacksburg VA USA

This paper examines the human computer interaction issue of learnability of interactive coordinated-view visualizations. We take the case of dataMaps, a census data visualization tool intended for a general audience with a huge percentage of novices. Usability tests conducted on dataMaps revealed three main kinds of problems that novices faced: they could not make strategic selections of coordinated visualizations according to a given task, they lacked familiarity with the nature of the attributes, and there were several misunderstandings of visual syntax and interaction widget usage. We outline design features which are desirable for novice-friendliness: Task based organization of coordinated views to enable strategic selection of views to suit the task, data centric approach to familiarize novices with data, self disclosure of visual syntax features and interaction mechanisms by the interface. The design should be such that they can smoothly transition from being a novice to expert. We examine how these principles may be applied to dataMaps to re-design it for "novice-friendliness".

关键词： data visualization Histograms Scattering Usability Testing Computer science Human computer interaction Displays Broadcasting data analysis

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Using workflow business process tools in simulation modeling 05

Using workflow business process tools in simulation modeling

引用

Simulation Winter conference

作者： J.G. Everton R.D. Stafford Brooks Automation Inc. Salt Lake UT USA

ISBN: (纸本)9780780395190

This article presents several model automation strategies used to improve the modeling operations such as data maintenance, model analysis and model visualization. There are several new products that have emerged in academics and industry that help reduce the costs of simulation and provide a solution that obtains more ROI from a new and/or existing simulation model. In addition these modeling techniques provide the capability to make models an operational component of a manufacturing system. As an operational component, models can provide planned work schedules, prediction estimates, and an operational decision tool that engineers and managers can used in making better operational decisions.

关键词： Analytical models Virtual manufacturing Maintenance engineering Predictive models Manufacturing automation Optimal scheduling Engineering management Project management data engineering Cities and towns

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Traffic engineering eye diagram

Traffic engineering eye diagram

引用

Consumer Communications and Networking conference, CCNC IEEE

作者： K. Kowalik M. Collier Research Institute for Networks and Communications Engineering (RINCE) University of Dublin Dublin Ireland

It is said that a picture is worth a thousand words - this statement also applies to networking topics. Thus, to effectively monitor network performance we need tools which present the performance metrics in a graphical way which is also clear and informative. We propose a tool for this purpose which we call the traffic engineering eye diagram (TEED). Eye diagrams are used in digital communications to analyse the quality of a digital signal; the TEED can similarly he used in the traffic engineering field to analyse the load balancing ability of a TE algorithm. In this paper we describe how to create such TEEDs and how to use them to analyse and compare various traffic engineering approaches.

关键词： Signal analysis Telecommunication traffic Tellurium Communication system traffic control Algorithm design and analysis Measurement Digital communication Humans data visualization Packaging

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Summarization - compressing data into an informative representation

Summarization - compressing data into an informative represe...

引用

IEEE International conference on data Mining (ICDM)

作者： V. Chandola V. Kumar Department of Computer Science University of Minnesota Minneapolis MN USA

In this paper, we formulate the problem of summarization of a dataset of transactions with categorical attributes as an optimization problem involving two objective functions - compaction gain and information loss. We propose metrics to characterize the output of any summarization algorithm. We investigate two approaches to address this problem. The first approach is an adaptation of clustering and the second approach makes use of frequent item sets from the association analysis domain. We illustrate one application of summarization in the field of network data where we show how our technique can be effectively used to summarize network traffic into a compact but meaningful representation. Specifically, we evaluate our proposed algorithms on the 1998 DARPA Off-line Intrusion Detection Evaluation data and network data generated by SKAION Corp for the ARDA information assurance program.

关键词： Telecommunication traffic data mining Computer science data analysis Monitoring Compaction Clustering algorithms Itemsets Intrusion detection data visualization

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