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检索条件"任意字段=Conference on Visualization and Data Analysis 2002"

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Multilayer Perceptron discrimination of software quality in a biomedical data analysis system

Multilayer Perceptron discrimination of software quality in ...

引用

IEEE Canadian conference on Electrical and Computer Engineering

作者： Alexiuk, MD Pizzi, NJ Natl Res Council Canada Inst Biodiagnost Winnipeg MB R3B 1Y6 Canada

ISBN: (纸本)0780375149

Biomedical data analysis typically involves large data sets, a diverse user base and intensive visualization procedures. These features place stringent quality demands upon software development and performance for both the architect and supervisor. An invaluable tool for software supervisors would be the automatic qualitative grading of software objects in terms of their extensibility, reusability, clarity and efficiency. This paper examines the quality assessment of software objects by a multilayer perceptron in relation to a gold standard provided by two independent software architects.

关键词： Artificial neural networks parallel programming software metrics

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A data compression method for tetrahedral meshes

A data compression method for tetrahedral meshes

引用

conference on visualization and data analysis 2002

作者： Ueng, SK Sikorski, K Natl Taiwan Ocean Univ Dept Comp Sci Chilung 202 Taiwan

ISBN: (纸本)0819444057

In this paper, a loose-less compression scheme is presented for Finite Element analysis (FEA) data. In this algorithm, all FEA cells are assumed to be tetrahedra. Therefore a cell has at most four neighboring-cells. Our algorithm starts with computing the indices of the four adjacent cells for each cell. The adjacency graph of the data set is formed by representing a cell by a vertex and by drawing an edge between two cells if they are adjacent. Then the adjacency graph is traversed by using a depth first search, and the mesh is split into tetrahedral strips. In a tetrahedral strip, every consecutive cells share a face, and thus only, one vertex index has to be specified for defining a tetrahedron. Therefore. the memory, space required for storing the mesh is reduced. The tetrahedral strips are encoded by using four types of instructions and converted into a sequence of bytes. Unlike most 3D geometrical compression algorithms, the indices of vertices are not changed in our scheme. Rearrangement of vertex data is not required.

关键词： data compression finite element analysis scientific visualization computer graphics

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data mining ocean model output at the naval oceanographic office major shared resource center

Data mining ocean model output at the naval oceanographic of...

引用

MTS/IEEE Oceans 2002 conference

作者： Gruzinskas, P Haas, A Goon, L USN Oceanog Off Stennis Space Ctr MS 39522 USA

ISBN: (纸本)0780375343

One of the Computational Technology Areas supported by the High Performance Computing Modernization Program is Climate, Weather, and Ocean (CWO) modeling. To this end, state-of-the-art computing architectures are leveraged against the extremely difficult problem of mathematically modeling and predicting the behavior of a variety of ocean climatological parameters. The problem at hand is the technology to store, retrieve, manipulate, and display these data has not kept pace with the computational technology. During the last five years, we have seen significant cost reductions associated with applying the status quo in visualization techniques to scientific data sets. This is due in large part to the computer gaming industry, driven by the huge profit margins associated with that market. The scientific community has benefited by these advances in low-cost architectures, but only as a by-product of its original intent, which is entertainment. Even so, these low-cost architectures are not designed to handle the scale of data sizes presented by the scientific community and serve only to make inadequate techniques cheaper to field and use. The Naval Oceanographic Office Major Shared Resource Center (NAVO MSRC) visualization Center is challenged with providing its users state-of-the-art analysis environments for the interrogation of their increasingly large data sets. This paper deals with the data generated by the CWO community, all of whom work with large domains and high resolutions (either vertically, horizontally, or both) that all vary over time. This leads to very large data sets (rows x columns x layers x attribute per cell) for each time step and can challenge even the most powerful architectures when trying to extract or "mine" information from the raw data. As in most visualization applications, the model output deals with physical parameters that are invisible to the naked eye. This means effective methods of display are required for ocean circulation or curren

关键词： Oceanography

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Knowledge acquisition and modeling in clinical information systems: A case study 13th

Knowledge acquisition and modeling in clinical information s...

引用

13th International conference on Knowledge Engineering and Knowledge Management (EKAW 2002)

作者： Falkman, G Torgersson, O Univ Skovde Dept Comp Sci SE-54128 Skovde Sweden Univ Gothenburg Chalmers Univ Technol Dept Comp Sci SE-41296 Gothenburg Sweden

ISBN: (纸本)3540442685

The goal of the MedView project is to develop models, methods, and tools to support clinicians in their daily work and research. MedView is based on a formal declarative model, which constitutes the main governing principle in MedView, not only in the formalization of knowledge, but in visualization models and in the design and implementation of individual tools and the system as a whole as well. Tools are provided for modeling, acquiring, and sharing knowledge, and for visualization and analysis of data.

关键词： data visualization

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A model for the visualization exploration process

A model for the visualization exploration process

引用

VIS 2002, IEEE Visualisation 2002

作者： Jankun-Kelly, T.J. Ma, Kwan-Liu Gertz, Michael Visualization and Graphics Res. Grp. Center for IPIC University of California Davis CA 95616 United States Database and Information Syst. Group Computer Science Department University of California Davis CA 95616 United States

The current state of the art in visualization research places a strong emphasis on different techniques to derive insight from disparate types of data. However, little work has investigated the visualization process itself. The information content of the visualization process-the results, history, and relationships between those results-is addressed by this work. A characterization of the visualization process is discussed, leading to a general model of the visualization exploration process. The model, based upon a new parameter derivation calculus, can be used for automated reporting, analysis, or visualized directly. An XML-based language for expressing visualization sessions using the model is also described. These sessions can then be shared and reused by collaborators. The model, along with the XML representation, provides an effective means to utilize the information within the visualization process to further data exploration.

关键词： visualization

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GeoCrystal:: Graphic-interactive access to geodata archives

GeoCrystal:: Graphic-interactive access to geodata archives

引用

conference on visualization and data analysis 2002

作者： Göbel, S Haist, J Jasnoch, U Fraunhofer Inst Comp Graph GIS Dept D-64283 Darmstadt Germany

ISBN: (纸本)0819444057

Recently there is spent a lot of effort to establish information systems and global infrastructures enabling both data suppliers and users to describe (--> eCommerce, metadata) as well as to find appropriate data. Examples for this are metadata information systems, online-shops or portals for geodata. The main disadvantages of existing approaches are insufficient methods and mechanisms leading users to (e.g. spatial) data archives. This affects aspects concerning usability and personalization in general as well as visual feedback techniques in the different steps of the information retrieval process. Several approaches aim at the improvement of graphical user interfaces by using intuitive metaphors, but only some of them offer 3D interfaces in the form of information landscapes or geographic result scenes in the context of information systems for geodata. This paper presents GeoCrystal, which basic idea is to adopt Venn diagrams to compose complex queries and to visualize search results in a 3D information and navigation space for geodata. These concepts are enhanced with spatial metaphors and 3D information landscapes (library for geodata) wherein users can specify searches for appropriate geodata and are enabled to graphic-interactively communicate with search results (book metaphor).

关键词： GeoCrystal GeoLibrary geodata archives information visualization visual information retrieval data mining metadata information systems metaphor spatial landscapes user interaction

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Dynamic multidimensional histograms 02

Dynamic multidimensional histograms

引用

ACM SIGMOD 2002 Proceedings of the ACM SIGMOD International conference on Managment of data

作者： Thaper, Nitin Guha, Sudipto Indyk, Piotr Koudas, Nick MIT United States University of Pennsylvania United States AT and T Research United States

ISBN: (纸本)9781581134971

Histograms are a concise and flexible way to construct summary structures for large data sets. They have attracted a lot of attention in database research due to their utility in many areas, including query optimization, and approximate query answering. They are also a basic tool for data visualization and analysis. In this paper, we present a formal study of dynamic multi-dimensional histogram structures over continuous data streams. At the heart of our proposal is the use of a dynamic summary data structure (vastly different from a histogram) maintaining a succinct approximation of the data distribution of the underlying continuous stream. On demand, an accurate histogram is derived from this dynamic data structure. We propose algorithms for extracting such an accurate histogram and we analyze their behavior and tradeoffs. The proposed algorithms are able to provide approximate guarantees about the quality of the estimation of the histograms they extract. We complement our analytical results with a thorough experimental evaluation using real data sets.

关键词： data visualization

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Investigating a component-oriented approach to adaptive collaborative visualization

Investigating a component-oriented approach to adaptive coll...

引用

conference on visualization and data analysis 2002

作者： Gallop, JR Blair, GS Cooper, CS Coulson, G Duce, DA Fitzpatrick, T Johnson, IJ Rutherford Appleton Lab CLRC Didcot OX11 0QX Oxon England

ISBN: (纸本)0819444057

Collaborative tools are developed to support work being undertaken by dispersed teams. As well as allowing voice and audio, several initiatives have supported collaborative information-rich tasks by enabling dispersed participants to share their visualization insights and to exercise some distributed control. In previous work, tools for collaborative visualization have been based on dataflow visualization systems, allowing visual programs to be rapidly prototyped and allowing not only the sharing of final results but also the process of obtaining them. However there are a number of issues: (1) the need for software policy changes, according to different meeting styles;(2) the presence of competing continuous flows, including voice and video of the participants and visualization movie sequences, in addition to bulk data flows;and (3) the dynamics of available resources which vary between participants or between mobile and office situations or within a single meeting. This need for adaptation is being studied in the Visual Beans project in the UK. The technologies under study include component technology, based on Java and CORBA, the use of continuous media in CORBA components, quality of service (QoS) monitoring and the use of open bindings.

关键词： adaptation collaborative visualization heterogeneous resources monitor

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A view-dependent approach to MIP for very large data

A view-dependent approach to MIP for very large data

引用

conference on visualization and data analysis 2002

作者： Shareef, N Crawfis, R Ohio State Univ Dept CIS Columbus OH 43210 USA

ISBN: (纸本)0819444057

A simple and yet useful approach to visualize a variety of structures from sampled data is the Maximum Intensity Projection (MIP). Higher valued structures of interest project over occluding structures. This can make MIP images difficult to interpret due to the loss of depth information. Animating about the data is one key way to try to decipher such ambiguities. The challenge is that MIP is inherently expensive and thus high frame rates are difficult to achieve. Variations to the original MIP algorithm and classification can help to further alleviate ambiguities and provide improved image quality. Unfortunately, these improved techniques are even more expensive. In addition, they require substantial parameter searching and tweaking. As today's data sizes are increasingly getting larger, current methods only allow very limited interaction. We explore a view-dependent approach using concepts from image-based rendering. A novel multilayered image representation storing scalar information is computed at a view sample and then warped to the user's view. We present algorithms using OpenGL to quickly compute MIP and its variations using commodity off-the-shelf graphics hardware to achieve near interactive rates.

关键词： MIP view-dependent image-based transfer function graphics hardware

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Improved ray-casting algorithm for volume visualization

Improved ray-casting algorithm for volume visualization

引用

conference on visualization and data analysis 2002

作者： Yang, SN Wu, TS Natl Tsing Hua Univ Dept Comp Sci Hsinchu 300 Taiwan Hwa Hsia Coll Technol & Commerce Dept Elect Engn Yokohama Kanagawa 235 Japan

ISBN: (纸本)0819444057

Applications in scientific visualization often involve extensive data sets, which represent scalar or vector valued functions resulting from experimental measurements. Ray Casting (RC) is a well-known approach for visualizing a multi-dimensional volume data. It casts a large number of rays from the viewer into the volume and then computes the progressive attenuation along each ray in the volume. It is known that the ray-casting algorithm requires extensive computation time. In this study, we propose two techniques to speed up the ray-casting process. First, we derive an estimation of ray step sizes during its progressive re-sampling without invocating viewing transformation operations. Hence lengthy computations of trigonometric functions and matrix multiplications can be avoided. Furthermore, by exploring the ray coherence property, we propose a scan-line algorithm so that ray/volume intersections can be found efficiently. The proposed algorithm is implemented and compared with the conventional RC algorithm. Experimental results show that the proposed algorithm performs three to four times faster than the conventional RC algorithm.

关键词： scientific visualization volume rendering ray casting re-sampling viewing transformation

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