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3rd International conference on Data Warehousing and Knowledge Discovery, DaWaK 2001

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3rd International conference on Data Warehousing and Knowledge Discovery, DaWaK 2001

ISBN: (纸本)3540425535

The proceedings contain 34 papers. The special focus in this conference is on Mining Temporal Patterns, Data Mining techniques, Collaborative Filtering and Web Mining. The topics include: Knowledge management in heterogeneous data warehouse environments;mining generalized association rules with multiple minimum supports;a theoretical framework for association mining based on the Boolean retrieval model;mining inter-transactional association rules;on the equivalence of top-down and bottom-up data mining in relational databases;discovering knowledge from meteorological databases;enhancing the apriori algorithm for frequent set counting;development of automated data mining system for quality control in manufacturing;ensemble feature selection based on the contextual merit;a new approach for item choice recommendations;an efficient collaborative filtering method;discovering web document associations for web site summarization;data visualization and analysis with self-organizing maps in learning metrics;towards a novel OLAP interface for distributed data warehouses;information warehouse for medical research;risk-management for data warehouse systems;parallel view maintenance under concurrent data updates of distributed sources;an experimental performance evaluation of incremental materialized view maintenance in object databases;managing time consistency for active data warehouse environments;optimization algorithms for simultaneous multidimensional queries in OLAP environments;improving the performance of OLAP queries using families of statistics trees;changes of dimension data in temporal data warehouses;adaptable similarity search using vector quantization and applying an OO database distribution strategy to data warehouses.

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Probability of cancer detection with optimized prostate biopsy protocols

Probability of cancer detection with optimized prostate biop...

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Medical Imaging 2001 conference

作者： Zeng, JC Sofer, A Bauer, JJ Zhang, W Sesterhenn, IA Moul, JW Mun, SK Georgetown Univ Med Ctr ISIS Ctr Washington DC 20007 USA

ISBN: (纸本)0819440051

What is the maximal possibility that a physician can detect a prostate cancer, given it is there? This research explores this issue from a statistical point of view and evaluates the theoretical results experimentally. We have collected 300 prostate specimens each with clinically localized cancers. We have reconstructed 300 computerized 3-D prostate models from these collected prostate specimens. What we will present here is an innovative study we have done recently using the above 300 3-D prostate models: First, a 3-D prostate cancer distribution atlas has been built by mapping the 300 individual prostate models. Optimal biopsy protocols have then been developed based on the 3-D cancer distribution atlas using nonlinear optimization techniques. By then, we have known, in theory, the maximal possible detection rate of prostate cancer with optimized biopsy. Finally, to experimentally evaluate the developed optimal biopsy protocols, a new generation of image-guided prostate biopsy system is being developed by dynamically fusing the optimal biopsy protocols as well as the 3-D cancer atlas with the ultrasound images during in vivo biopsies. A physician performing the needle biopsy on a live patient using the developed image-guided prostate biopsy system will have a significantly improved understanding on where the biopsies should be placed, leading to an improved performance in terms of cancer detection.

关键词： prostate biopsy 3-D cancer atlas probability of cancer detection optimization biopsy protocols image-guided procedures

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Interactive display of surfaces using subdivision surfaces and wavelets

Interactive display of surfaces using subdivision surfaces a...

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Spring conference on Computer Graphics

作者： M.A. Duchaineau M. Bertram S. Porumbescu B. Hamann K.I. Joy Center for Applied Scientific Computing Lawrence Livemore National Laboratory Livermore CA USA FB Informatik Universitaet Kaiserslautern Kaiserslautern Germany Center for Image Processing and Integrated Computing Department of Computer Science University of California USA

Complex surfaces and solids are produced by large-scale modeling and simulation activities in a variety of disciplines. Productive interaction with these simulations requires that these surfaces or solids should be viewable at interactive rates - yet many of these surfaces/solids can contain hundreds of millions of polygons/polyhedra. Interactive display of these objects requires compression techniques to minimize storage, and fast view-dependent triangulation techniques to drive the graphics hardware. In this paper, we review recent advances in subdivision-surface wavelet compression and optimization that can be used to provide a framework for both compression and triangulation. These techniques can be used to produce suitable approximations of complex surfaces of arbitrary topology and can be used to determine suitable triangulations for display. The techniques can be used in a variety of applications in computer graphics, computer animation and visualization.

关键词： Solid modeling Large-scale systems Drives Hardware Topology Computer displays Application software Computer graphics Animation visualization

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Signal identification by nonlinear optimization

Signal identification by nonlinear optimization

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IEEE International conference on Electronics, Circuits and Systems (ICECS)

作者： P. Popela J. Sklenar Department of Statistics and Operations Research Faculty of Science University of Malta Msida Malta Department of Mathematics Faculty of Mechanical Engineering Brno University of Technology Brno Czech Republic

Deals with the use of nonlinear optimization techniques to solve the problem of signal identification. The presented idea considers cases when time series are composed of a finite number of nonlinear functions distinct in their parameter sets, and realizations of additive random error. The focus is on the sums of parameterized trigonometric functions. As the random error probability distribution is assumed unknown, the common LSQ criterion is replaced with its parameterized generalization. The obtained unconstrained nonsmooth minimization problem can be solved either directly or after a smooth reformulation to the constrained problem. The efficient nonlinear programming algorithms are utilized. The initial values for computational procedures are estimated using heuristics and suitable statistical techniques. The proposed ideas are illustrated by simple explanatory examples and accompanied by figures. Test results are shown for two optimization solvers, MS Excel Solver and advanced GAMS/MINOS. MATLAB is used for visualization.

关键词： Signal processing MATLAB Harmonic analysis Frequency estimation Additive noise Mathematics Mechanical engineering Paper technology Statistics Operations research

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Visualizing capacity and load in production planning

Visualizing capacity and load in production planning

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International conference on Information Visualisation (IV)

作者： P.Y.F. Wu Department of Information Science and Telecommunications School of Information Sciences University of Pittsburgh USA

Production planning is difficult not just because of the intricate relationships between the myriads of parameters, but also the dynamic nature of changes in the decision making environment. Good visualization tools for production planning are rare. Production planning is not merely an optimization problem. The possibility of making incremental manual changes will allow the planner to be more responsive to the dynamic changes in businesses today. The paper reports on a study prompted by the production planning of metal ingot casting. To visualize the production capacity and the current load in production planning, we focused on the potential bottle-neck machines, namely, the melting furnace and the pre-heat oven. We developed models of these machines which capture their special characteristics relevant to planning. Using our models in the load graphs of these machines, we were able to visualize the loading situation and the available production capacity. The visual models facilitate direct manipulation by a human planner to interact with a production plan to make incremental changes, with the impact of the change verified automatically. visualization with the interactive techniques will augment advanced planning systems to provide better versatility and enhance usability.

关键词： visualization Capacity planning Production planning Decision making Casting Furnaces Ovens Load modeling Humans Usability

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Decompiling Java using staged encapsulation

Decompiling Java using staged encapsulation

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Working conference on Reverse Engineering

作者： J. Miecznikowski L. Hendren Sable Research Group School of Computer Science McGill University Montreal Canada

The paper presents an approach to program structuring for use in decompiling Java bytecode to Java source. The structuring approach uses three intermediate representations: (1) a list of typed, aggregated statements with an associated exception table, (2) a control flow graph, and (3) a structure encapsulation tree. The approach works in six distinct stages, with each stage focusing on a specific family of Java constructs, and each stage contributing more detail to the structure encapsulation tree. After completion of all stages the structure encapsulation tree contains enough information to allow a simple extraction of a structured Java program. The approach targets general Java bytecode including bytecode that may be the result of front-ends for languages other than Java, and also bytecode that has been produced by a bytecode optimizer. Thus, the techniques have been designed to work for bytecode that may not exhibit the typical structured patterns of bytecode produced by a standard Java compiler. The structuring techniques have been implemented as part of the Dava decompiler which has been built using the Soot framework.

关键词： Java Encapsulation Tree graphs Pattern matching Computer science Data mining Design optimization visualization Constraint optimization High level languages

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Efficient use of the BlobTree for rendering purposes

Efficient use of the BlobTree for rendering purposes

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International conference on Shape Modeling and Applications

作者： M. Fox C. Galbraith B. Wyvill Department of Computer Science University of Calgary AB Canada

ISBN: (纸本)0769508537

One of the major applications of implicit surface modeling systems has been the generation of cartoon-like characters. Recently, additional modeling methods have been combined with implicit surfaces to create much more complex models. These methods include constructive solid geometry (CSG), warping, and two-dimensional texture mapping (among others). The BlobTree has been introduced to organize all of these elements into a single structure which allows both local and global applications of each of these techniques in a general and intuitive fashion. The BlobTree lends itself well to rapid and direct specification of complex models, however current implementations of the BlobTree have not been engineered for efficiency, and perform poorly when attempting to render large models. In this work we apply established techniques, such as spatial subdivision and tree optimization, to the BlobTree. The objective is to increase efficiency during rendering without restricting the functionality of the BlobTree as a modeling tool.

关键词： Ray tracing Solids Facial animation Rendering (computer graphics) visualization Computer science Application software Motion pictures Geometry Organizing

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3D edge detection to define landmarks for point-based warping in brain imaging

3D edge detection to define landmarks for point-based warpin...

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IEEE International conference on Image Processing

作者： R. Pielot M. Scholz K. Obermayer E.D. Gundelfinger A. Hess Leibniz Institute of Neurobiology Magdeburg Germany Department of Computer Science Technical University Berlin Berlin Germany

The accurate comparison of inter-individual 3D image datasets of brains requires warping techniques to reduce geometric variations. In this study we use a point-based method of warping with weighted sums of displacement vectors, which is extended by an optimization process. To improve the practicability of 3D warping, we investigate 3D operators as landmark detectors for the applicability to our image datasets. The combined approach was tested on 3D autoradiographs of brains of Mongolian gerbils. The warping function is distance-weighted with landmark-specific weighting factors. These weighting factors are optimized by a computational evolution strategy. Within this optimization process the quality of warping is quantified by the sum of spatial differences of manually predefined registration points (registration error). The described approach combines a highly suitable procedure to detect landmarks in brain images and a point-based warping technique, which optimizes local weighting factors.

关键词： Image edge detection Brain optimization methods Humans Acoustic imaging visualization Detection algorithms Animals Computer science Detectors

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Detection and correction of poorly converged optimizations by iteratively reweighted least squares

Detection and correction of poorly converged optimizations b...

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41st AIAA/ASME/ASCE/AHS/ASC Structrures, Structural Dynamics, and Materials conference and Exhibit AIAA/ASME/AHS Adaptive Structures Forum AIAA Non-Deterministic Approaches Forum AIAA Space Inflatables Forum

作者： Kim, Hongman Papila, Melih Mason, William H. Haftka, Raphael T. Watson, Layne T. Grossman, Bernard Virginia Polytechnic Inst and State Univ Blacksburg United States

The use of Iteratively Reweighted Least Squares (IRLS) for detecting design points where structural optimizations give poor designs is demonstrated. Since most optimization error is one sided with poor results producing an overweight objective value, a nonsymmetrical version of IRLS (NIRLS) that takes into account the asymmetry in optimization errors is also developed. optimization studies with various sets of convergence criteria on wing bending material weight of a high speed civil transport are used to demonstrate these techniques. First, inspection of poor designs by a visualization technique that plots objective function and constraint boundaries on planes including the suspected points, indicated that poor results were due to incomplete convergence of the optimization procedure rather than due to local minima. Results obtained with several hundred design points indicated that IRLS techniques can find most of the points with large optimization errors, but that NIRLS techniques are much more reliable in this task. Finally, the paper shows that the choice of convergence settings and parameters can have large effects on optimization errors. In particular, tighter criteria for some parameters may actually increase optimization error.

关键词： optimization

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Prefiltering and reconstruction filters in the volume rendering

Prefiltering and reconstruction filters in the volume render...

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10th Mediterranean Electrotechnical conference on Information Technology and Electrotechnology for the Mediterranean Countries

作者： Goluban, A Mihajlovic, Z Budin, L Univ Zagreb Fac Elect Engn & Comp Dept Control & Comp Engn Automat Zagreb 10000 Croatia

ISBN: (纸本)078036290X

This paper deals with reconstruction filters and appropriate prefiltering techniques in the volume rendering. Sampling, resampling and reconstruction of continuous functions are used in many different fields. To satisfy conditions of Shannon theorem, prefiltering of images or data volumes is usually required before sampling. Usual approach is to use Gaussian prefilter, where the cutoff frequency is determined by the sampling rate, and one of different reconstruction schemes is then applied. The problem is to determine a prefilter so that the reconstruction will reproduce original object as accurately as possible. If the combination of prefiltering and reconstruction in the volumetric space is not adequate, aliasing artifacts will appear. Aliasing artifacts project from the three-dimensional space onto the projection plane and superpose to the artifacts caused by sampling and reconstruction in two dimensions. In this paper we present a methodology for designing filters based on optimization of combined operation of prefiltering and reconstruction postfiltering. This methodology offers a framework for comparing different reconstruction schemes in equal circumstances. The correct choice of reconstruction will also influence the derivative reconstruction which is used for shading. We demonstrate our results on examples in two- and three-dimensional space.

关键词： interpolation volume reconstruction prefiltering visualization

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