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Query, analysis, and visualization of hierarchically structured data using Polaris 02

Query, analysis, and visualization of hierarchically structu...

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Proceedings of the eighth ACM SIGKDD international conference on Knowledge discovery and data mining

作者： Chris Stolte Diane Tang Pat Hanrahan Stanford CA

ISBN: (纸本)9781581135671

In the last several years, large OLAP databases have become common in a variety of applications such as corporate data warehouses and scientific computing. To support interactive analysis, many of these databases are augmented with hierarchical structures that provide meaningful levels of abstraction that can be leveraged by both the computer and analyst. This hierarchical structure generates many challenges and opportunities in the design of systems for the query, analysis, and visualization of these *** this paper, we present an interactive visual exploration tool that facilitates exploratory analysis of data warehouses with rich hierarchical structure, such as might be stored in data cubes. We base this tool on Polaris, a system for rapidly constructing table-based graphical displays of multidimensional databases. Polaris builds visualizations using an algebraic formalism derived from the interface and interpreted as a set of queries to a database. We extend the user interface, algebraic formalism, and generation of data queries in Polaris to expose and take advantage of hierarchical structure. In the resulting system, analysts can navigate through the hierarchical projections of a database, rapidly and incrementally generating visualizations for each projection.

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Neuro-fuzzy systems for explaining data sets

Neuro-fuzzy systems for explaining data sets

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conference of the North American Fuzzy Information Processing Society - NAFIPS

作者： D.D. Nauck BT Exact Technologies Research Ipswich UK

In this paper we describe ITEMS-a system for the estimation, visualization and exploration of travel data of a mobile workforce. One key feature of ITEMS is the interactive exploration of travel data that is visualized on maps. Users can not only see which journeys were late, on-time or early, but they can also request explanations why a journey was possibly late, for example. We have integrated a neuro-fuzzy system based on NEFCLASS into ITEMS. NEFCLASS generates explanatory fuzzy rules for a selected data subset in real time and presents them to the user. The rules can help the user in understanding the data better and in spotting possible problems in workforce management. We discuss aspects of learning interpretable fuzzy rules for generating explanations and demonstrate the application of NEFCLASS in the context of ITEMS.

关键词： Fuzzy neural networks data analysis Intelligent systems World Wide Web data visualization Customer relationship management Predictive models Fuzzy systems Electronic mail Web and internet services

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analysis of DNA microarray data using self-organizing map and kernel based clustering

Analysis of DNA microarray data using self-organizing map an...

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International conference on Neural Information Processing

作者： M. Kotani A. Sugiyama S. Ozawa Faculty of Engineering Kobe University Kobe Japan Graduate School of Science and Technology Kobe University Kobe Japan

We describe a method of combining a self-organizing map (SOM) and a kernel based clustering for analyzing and categorizing the gene expression data obtained from DNA microarray. The SOM is an unsupervised neural network learning algorithm and forms a mapping a high-dimensional data to a two-dimensional space. However, it is difficult to find clustering boundaries from results of the SOM. On the other hand, the kernel based clustering can partition the data nonlinearly. In order to understand the results of SOM easily, we apply the kernel based clustering to finding the clustering boundaries and show that the proposed method is effective for categorizing the gene expression data.

关键词： DNA Kernel Gene expression Robustness data visualization databases data engineering Neural networks Clustering algorithms Partitioning algorithms

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General tracking performance description for systems of sensors

General tracking performance description for systems of sens...

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International conference on Information Fusion

作者： A. Andersson T.R. Kronhamn Airborne Radar Division Ericsson Microwave Systems AB Molndal Sweden

Traditionally, radar or sensor performance is reviewed in terms of detection ranges and measurement accuracy. Today, when the radar often is a part of a locally integrated sensor system, which shall cooperate with other sensor systems, other performance parameters are required for evaluation and comparison of various solutions. The present paper gives an analysis method for descriptions of the tracking performance over the entire surveillance volume. It is also shown how the tracking performance can be visualized and interpreted. Furthermore, given that the user has chosen his preferred performance metrics, the paper shows how the analysis can be used as a decision aid, by comparing the existing system performance with the performance of a planned system configuration. Finally, the advantages of sensor data fusion are often asked for to be quantified. With the approach taken this can be done. The paper shows the tracking performance for a system of sensors, at each point in the volume, either as picking the best set of data from the individual sensors, or as the optimally fused data.

关键词： Sensor phenomena and characterization Sensor systems Radar tracking Sensor fusion Performance analysis Radar measurements Radar detection Surveillance data visualization System performance

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The informatics requirements for human brain atlasing

The informatics requirements for human brain atlasing

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International conference on Neural Information Processing

作者： A.W. Toga Laboratory of Nemo Imaging Department of Neurology School of Medicine UCLA Los Angeles CA USA

Brain atlases are neuroimage databases providing an appropriate coordinate system to enable multisubject comparisons, along with comprehensive descriptions of the data. Warping tools, visualization, and statistical analyses that accommodate the various neuroimaging modalities can be used to integrate diverse data to form comprehensive maps describing a particular subpopulation's brain structure and function. Task performance and genetic information can be related to brain morphology, establishing complex inter-relations between genotype, phenotype, and behavior.

关键词： Humans Image databases Brain mapping Genetics Image analysis Positron emission tomography Biomedical informatics Laboratories Nervous system Biomedical imaging

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A statistical analysis of shape reconstruction from areas of shadows

A statistical analysis of shape reconstruction from areas of...

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Asilomar conference on Signals, Systems & Computers

作者： A. Poonawala P. Milanfar R.J. Gardner Computer Engineering Department University of California Santa Cruz CA USA Electrical Engineering Department University of California Santa Cruz CA USA Mathematics Department Western Washington University Bellingham WA USA

We present a statistical analysis of the problem of shape reconstruction from measurements of the brightness function (areas of shadows) by deriving the Cramer-Rao lower bound (CRLB) on the estimated 2-D boundary. Confidence region techniques are used to analyze and visualize the performance of the 2-D parametric shape estimation problem. The brightness function data is very weak, so a constrained CRLB is used on the shape parameters to form the confidence regions. Algorithms for reconstructing the shape of a convex object from multiple measurements of its brightness function were developed in [R. J. Gardner and P. Milanfar, "Shape reconstruction from brightness functions", August 2001] and [R. J. Gardner and P. Milanfar, "Reconstruction of convex bodies from brightness functions"]. The Cramer-Rao bound analysis presented provides statistical estimates that can be used for performance evaluation of these algorithms.

关键词： Statistical analysis Brightness Shape measurement Image reconstruction Tomography Area measurement Electric variables measurement Performance analysis data visualization Algorithm design and analysis

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On the use of metaballs to visually map source code structures and analysis results onto 3D space

On the use of metaballs to visually map source code structur...

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Working conference on Reverse Engineering

作者： J. Rilling S.P. Mudur Department of Computer Science Concordia University Canada

Many reverse-engineering tools have been developed to derive abstract representations from existing source code. Graphic visuals derived from reverse engineered source code have long been recognized for their impact on improving the comprehensibility of the structural and behavioral aspects of software systems and their source code. As programs become more complex and larger, the sheer volume of information to be comprehended by developers becomes daunting. In this paper, we combine dynamic source analysis to selectively identify source code that is relevant at any point and combine it with 3D visualization techniques to reverse engineer and analyze source code, program executions, and program structures. For this research, we focus particularly on the use of metaballs, a 3D modeling technique that has already found extensive use representing complex organic shapes and structural relationships in biology and chemistry, to provide suitable 3D visual representations for software systems.

关键词： Software systems Reverse engineering data visualization Biological system modeling Computer science Computer graphics Shape Systems biology Computational biology Chemistry

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Integration of measurement tools in medical 3d visualizations 02

Integration of measurement tools in medical 3d visualization...

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Proceedings of the conference on visualization '02

作者： Bernhard Preim Christian Tietjen Wolf Spindler Heinz Otto Peitgen MeVis --- Center for Medical Diagnostic Systems and Visualization Bremen Germany

ISBN: (纸本)9780780374980

We discuss 3d interaction techniques for the quantitative analysis of spatial relations in medical visualizations. We describe the design and implementation of measurement tools to measure distances, angles and volumes in 3d visualizations. The visualization of measurement tools as recognizable 3d objects and a 3d interaction, which is both intuitive and precise, determines the usability of such facilities. Measurements may be carried out in 2d visualizations of the original radiological data and in 3d visualizations. The result of a measurement carried out in one view is also displayed in the other view appropriately. We discuss the validation of the obtained measures. Finally, we describe how some important measurement tasks may be solved automatically.

关键词： quantitative analysis interaction techniques medical visualization computer-assisted surgery

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Protection against methanol-induced retinal toxicity by LED photostimulation

Protection against methanol-induced retinal toxicity by LED ...

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12th conference on Ophthalmic Technologies

作者： Whelan, HT Wong-Riley, MTT Eells, JT Med Coll Wisconsin Milwaukee WI 53226 USA

ISBN: (纸本)0819443506

We have initiated experiments designed to test the hypothesis that 670nm Light-Emitting Diode (LED) exposure will attenuate formate-induced retinal dysfunction in a rodent model of methanol toxicity. Methanol intoxication produces toxic injury to the retina. The toxic metabolite formed in methanol intoxication is formic acid, a mitochondrial toxin known to inhibit cytochrome oxidase activity. 670 rim LED light has been hypothesized to act by stimulating cytochrome oxidase activity. To test this hypothesis, one group of animals was intoxicated with methanol, a second group was intoxicated with methanol and LED-treated and a third group was untreated. LED treatment (670 nm for 1 min 45 seconds = 50 mW/cm(2), 4 joules/cm(2)) was administered at 5, 25, and 50 hours after the initial dose of methanol. At 72 hours of methanol intoxication, retinal function was assessed by measurement of ERG responses and retinas were prepared for histologic analysis. ERG responses recorded in methanol-intoxicated animals revealed profound attenuation of both rod-dominated and UV-cone mediated responses. In contrast, methanol-intoxicated animals exposed to LED treatment exhibited a nearly complete recovery of rod-dominated ERG responses and a slight improvement of UV-cone mediated ERG responses. LED treatment also protected the retina against the histopathologic changes produced by formate in methanol. intoxication. These data provide evidence that LED phototherapy protects the retina against the cytotoxic actions of formate and are consistent with the hypothesis that LED photostimulation improves mitochondrial respiratory chain function.

关键词： Light emitting diodes Retina Toxicity Photostimulation Blood Optic nerve Rods visualization Eye Tissues

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Visual exploration of communication in command and control

Visual exploration of communication in command and control

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International conference on Information Visualisation (IV)

作者： P.-A. Albinsson M. Morin Swedish Defence Research Agency Linkoping Sweden Department of Computer and Information Science Linköping University Linkoping Sweden

Communication is a central activity in command and control. However, analysing communication using linear transcription of large amounts of sequential data is tedious and time consuming. This paper describes an alternative approach for communication analysis based on visual exploration of abstract representations of communication. It introduces a visualisation technique based on the Attribute Explorer. The technique was implemented in a visualisation component embedded in a framework for coordinated presentation of temporal data. It is demonstrated using authentic communication data from a military exercise and a rescue operation.

关键词： Command and control systems data visualization Streaming media Military communication Speech analysis Graphical user interfaces Navigation Information science Humans Fires

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