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Independent Quadtrees

Description: This dissertation deals with the problem of manipulating and storing an image using quadtrees. A quadtree is a tree in which each node has four ordered children or is a leaf. It can be used to represent an image via hierarchical decomposition. The image is broken into four regions. A region can be a solid color (homogeneous) or a mixture of colors (heterogeneous). If a region is heterogeneous it is broken into four subregions, and the process continues recursively until all subregions are homogeneous. The traditional quadtree suffers from dependence on the underlying grid. The grid coordinate system is implicit, and therefore fixed. The fixed coordinate system implies a rigid tree. A rigid tree cannot be translated, scaled, or rotated. Instead, a new tree must be built which is the result of one of these transformations. This dissertation introduces the independent quadtree. The independent quadtree is free of any underlying coordinate system. The tree is no longer rigid and can be easily translated, scaled, or rotated. Algorithms to perform these operations axe presented. The translation and rotation algorithms take constant time. The scaling algorithm has linear time in the number nodes in the tree. The disadvantage of independent quadtrees is the longer generation and display time. This dissertation also introduces an alternate method of hierarchical decomposition. This new method finds the largest homogeneous block with respect to the corners of the image. This block defines the division point for the decomposition. If the size of the block is below some cutoff point, it is deemed to be to small to make the overhead worthwhile and the traditional method is used instead. This new method is compared to the traditional method on randomly generated rectangles, triangles, and circles. The new method is shown to use significantly less space for all three ...
Date: December 1986
Creator: Atwood, Larry D. (Larry Dale)
Partner: UNT Libraries

GenoGraphics for OpenWindows

Description: GenoGraphics is a generic utility for constructing and querying one-dimensional linear plots. The outgrowth of a request from Dr. Cassandra Smith for a tool to facilitate her genome mapping research. GenoGraphics development has benefited from a continued collaboration with her. Written in Sun Microsystem's OpenWindows environment and the BTOL toolkit developed at Argonne National Laboratory. GenoGraphics provides an interactive, intuitive, graphical interface. Its features include: viewing multiple maps simultaneously, zooming, and querying by mouse clicking. By expediting plot generation, GenoGraphics gives the scientist more time to analyze data and a novel means for deducing conclusions.
Date: April 1992
Creator: Hagstrom, Ray; Michaels, George S.; Taylor, Ronald; Price, Morgan; Overbeek, Ross; Zawada, Dave et al.
Partner: UNT Libraries Government Documents Department

An investigation of the effects of presentation format and time pressure on decision makers performing tasks of varying complexitites

Description: The primary objective of this study was to determine which presentation format leads to better decision performance when the decision maker solving a problem of certain complexity is experiencing a certain level of time pressure.
Date: December 1990
Creator: Hwang, Mark I. (Mark Ing-Hwa)
Partner: UNT Libraries

SCALE Graphical Developments for Improved Criticality Safety Aalyses

Description: New computer graphic developments at Oak Ridge National Ridge National Laboratory (ORNL) are being used to provide visualization of criticality safety models and calculational results as well as tools for criticality safety analysis input preparation. The purpose of this paper is to present the status of current development efforts to continue to enhance the SCALE (Standardized Computer Analyses for Licensing Evaluations) computer software system. Applications for criticality safety analysis in the areas of 3-D model visualization, input preparation and execution via a graphical user interface (GUI), and two-dimensional (2-D) plotting of results are discussed.
Date: September 20, 1999
Creator: Barnett, D. L.; Bowman, S. M.; Horwedel, J. E. & Petrie, L. M.
Partner: UNT Libraries Government Documents Department

Shiva: An astronomical data analysis framework

Description: A key online and off-line software component of the Sloan Digital Sky Survey (SDSS) is Shiva. Shiva provides a readily extendible framework upon which the SDSS data reduction pipeline software is built. In this paper we present an introduction to the Shiva data analysis framework. We briefly discuss the features and the inherent prototyping and rapid development capabilities that make Shiva an integral part in the on-going development of SDSS software.
Date: December 1, 1995
Creator: Sergey, G.; Berman, E.; Huang, C.H.; Kent, S.; Newberg, H; Nicinski, T. et al.
Partner: UNT Libraries Government Documents Department

IMAGES, IMAGES, IMAGES

Description: The role of images of information (charts, diagrams, maps, and symbols) for effective presentation of facts and concepts is expanding dramatically because of advances in computer graphics technology, increasingly hetero-lingual, hetero-cultural world target populations of information providers, the urgent need to convey more efficiently vast amounts of information, the broadening population of (non-expert) computer users, the decrease of available time for reading texts and for decision making, and the general level of literacy. A coalition of visual performance experts, human engineering specialists, computer scientists, and graphic designers/artists is required to resolve human factors aspects of images of information. The need for, nature of, and benefits of interdisciplinary effort are discussed. The results of an interdisciplinary collaboration are demonstrated in a product for visualizing complex information about global energy interdependence. An invited panel will respond to the presentation.
Date: July 1, 1980
Creator: Marcus, A.
Partner: UNT Libraries Government Documents Department

Status of the HEPVis class library

Description: Since 1994 a group of High Energy Physicists and Computer Scientists have been collaborating on HEPVis, a library of 2-D and 3-D shapes for detector visualization and HEP analysis. Based on the Open Inventor (1) toolkit, HEPVis has grown into an international collaboration since its inception in 1994. This paper describes the library, its history, and its future. Images from HEP applications that use the library are also included.
Date: March 3, 1999
Creator: al., Amber Boehnlein et
Partner: UNT Libraries Government Documents Department

DOE/FETC Gasis Project

Description: Technical progress on the GAS IS project during the quarter for contract no. DE-AC21 -93 MC281 39 is described. During this period, work was performed on Task 4 Technology Transfer, Task 7: Software Enhancement, Task 8: Reservoir Data System Updates, and Task 9: Supplemental Reservoir Studies.
Date: November 12, 1998
Creator: Hugman, R. H.
Partner: UNT Libraries Government Documents Department

Visual literacy in computer culture: reading, writing, and drawing Logo turtle graphics

Description: This study seeks to explore relationships between Logo turtle graphics and visual literacy by addressing two related questions: (a) can traditional visual literacy concepts, as found in the published literature, be synthesized in terms of Logo turtle graphics, and (b) do the literature and "hands-on" experience with turtle graphics indicate that visual competencies are pertinent to graphics-based electronic communications in computer culture?
Date: August 1989
Creator: Horn, Carin E.
Partner: UNT Libraries

General Purpose Programming on Modern Graphics Hardware

Description: I start with a brief introduction to the graphics processing unit (GPU) as well as general-purpose computation on modern graphics hardware (GPGPU). Next, I explore the motivations for GPGPU programming, and the capabilities of modern GPUs (including advantages and disadvantages). Also, I give the background required for further exploring GPU programming, including the terminology used and the resources available. Finally, I include a comprehensive survey of previous and current GPGPU work, and end with a look at the future of GPU programming.
Date: May 2008
Creator: Fleming, Robert
Partner: UNT Libraries

Users Guide and Tutorial for PC-GenoGraphics: Version 1

Description: PC-GenoGraphics is a visual database/query facility designed for reasoning with genomic data. Data are represented to reflect variously accurate notions of the location of their sites, etc., along the length of the genome. Sequence data are efficiently stored and queried via a rather versatile language so that entire sequences of organisms will be treatable as they emerge. Other classes of information, such as function descriptions, are stored in a relational form, and joint queries relating these to sequence properties are supported. All queries result in visual responses that indicate locations along the genome. The results of queries can themselves be promoted to be queryable objects against which further queries can be launched.
Date: December 1992
Creator: Hagstrom, Ray; Overbeek, Ross & Price, Morgan
Partner: UNT Libraries Government Documents Department

Visualization Tools for Adaptive Mesh Refinement Data

Description: Adaptive Mesh Refinement (AMR) is a highly effective method for simulations that span a large range of spatiotemporal scales, such as astrophysical simulations that must accommodate ranges from interstellar to sub-planetary. Most mainstream visualization tools still lack support for AMR as a first class data type and AMR code teams use custom built applications for AMR visualization. The Department of Energy's (DOE's) Science Discovery through Advanced Computing (SciDAC) Visualization and Analytics Center for Enabling Technologies (VACET) is currently working on extending VisIt, which is an open source visualization tool that accommodates AMR as a first-class data type. These efforts will bridge the gap between general-purpose visualization applications and highly specialized AMR visual analysis applications. Here, we give an overview of the state of the art in AMR visualization research and tools and describe how VisIt currently handles AMR data.
Date: May 9, 2007
Creator: Weber, Gunther H.; Beckner, Vincent E.; Childs, Hank; Ligocki,Terry J.; Miller, Mark C.; Van Straalen, Brian et al.
Partner: UNT Libraries Government Documents Department

Digital video technology - today and tomorrow: 11th office information technology conference

Description: Digital video is probably computing`s fastest moving technology today. Just three years ago, the zenith of digital video technology on the PC was the successful marriage of digital text and graphics with analog audio and video by means of expensive analog laser disc players and video overlay boards. The state of the art involves two different approaches to fully digital video on computers: hardware-assisted and software-only solutions.
Date: October 1, 1994
Creator: Liberman, J.
Partner: UNT Libraries Government Documents Department

Expanding the Numerical Control Version of Computer Graphics to Include Automatically Computed Machine Feeds and Speeds

Description: The objective of the study is to utilize the cross-sectional computation capabilities of a computer to calculate the revolutions per minute, to determine the volume of metal being removed by the machine cutter at any point in the programmed path, and to output the feed rate that the particular situation requires. The six chapters which present the information are as follows: Chapter I, introduction; Chapter II, analysis of factors affecting the computation of speed and feed rate parameters; Chapter III, organization of the input by the numerical control programmer; Chapter IV, modifications to the computer software; Chapter V, evaluation of the benefits of utilizing computed speed and feed rates; Chapter VI, summary, findings, conclusions, and recommendations.
Date: August 1979
Creator: Berry, Ronny E.
Partner: UNT Libraries

InSight: An innovative multimedia training tool

Description: InSight is an innovative computer-based multimedia training tool that provides a navigable virtual environment and links to related information. It provides training and guidance for touring and observing operations at any facility or site in a realistic virtual environment. This presentation identifies unique attributes of InSight and describes the initial application at ANL-West. A brief description of the development of this tool, production steps, and an onscreen demonstration of its operation are also provided.
Date: May 1, 1996
Creator: Seidel, B.R.; Crites, D.C.; Forsmann, J.H. & Walters, B.G.
Partner: UNT Libraries Government Documents Department

Adaptive resolution refinement for high-fidelity continuum parameterizations

Description: This paper describes an algorithm the adaptively samples a parametric continuum so that a fidelity metric is satisfied. Using the divide-and-conquer strategy of adaptive sampling eliminates the guesswork of traditional uniform parameterization techniques. The space and time complexity of parameterization are increased in a controllable manner so that a desired fidelity is obtained.
Date: October 1, 1996
Creator: Anderson, J.W.; Khamayseh, A. & Jean, B.A.
Partner: UNT Libraries Government Documents Department

Composing simulations using persistent software components

Description: The traditional process for developing large-scale simulations is cumbersome, time consuming, costly, and in some cases, inadequate. The topics of software components and component-based software engineering are being explored by software professionals in academic and industrial settings. A component is a well-delineated, relatively independent, and replaceable part of a software system that performs a specific function. Many researchers have addressed the potential to derive a component-based approach to simulations in general, and a few have focused on military simulations in particular. In a component-based approach, functional or logical blocks of the simulation entities are represented as coherent collections of components satisfying explicitly defined interface requirements. A simulation is a top-level aggregate comprised of a collection of components that interact with each other in the context of a simulated environment. A component may represent a simulation artifact, an agent, or any entity that can generated events affecting itself, other simulated entities, or the state of the system. The component-based approach promotes code reuse, contributes to reducing time spent validating or verifying models, and promises to reduce the cost of development while still delivering tailored simulations specific to analysis questions. The Integrated Virtual Environment for Simulation (IVES) is a composition-centered framework to achieve this potential. IVES is a Java implementation of simulation composition concepts developed at Los Alamos National Laboratory for use in several application domains. In this paper, its use in the military domain is demonstrated via the simulation of dismounted infantry in an urban environment.
Date: March 1999
Creator: Holland, J. V.; Michelsen, R. E.; Powell, D. R.; Upton, S. C. & Thompson, D. R.
Partner: UNT Libraries Government Documents Department

Science/art - art/science: case studies of the development of a professional art product

Description: Objective was to follow the cognitive and creative processes demonstrated by student research participants as they integrated a developing knowledge of ``big`` science, as practiced at LLNL, into a personal and idiosyncratic visual, graphical, or multimedia product. The participants, all non-scientists, involved in this process, attended a series of design classes, sponsored by LLNL at the Art Center College of Design in Pasadena CA. As a result of this study, we have become interested in the possibility of similar characteristics between scientists and artists. We have also become interested in the different processes that can be used to teach science to non-scientists, so that they are able to understand and portray scientific information.
Date: February 24, 1997
Creator: Sesko, S.C. & Marchant, M.
Partner: UNT Libraries Government Documents Department

Gist: A scientific graphics package for Python

Description: {open_quotes}Gist{close_quotes} is a scientific graphics library written by David H. Munro of Lawrence Livermore National Laboratory (LLNL). It features support for three common graphics output devices: X Windows, (Color) PostScript, and ANSI/ISO Standard Computer Graphics Metafiles (CGM). The library is small (written directly to Xlib), portable, efficient, and full-featured. It produces X versus Y plots with {open_quotes}good{close_quotes} tick marks and tick labels, 2-dimensional quadrilateral mesh plots with contours, vector fields, or pseudo color maps on such meshes, with 3-dimensional plots on the way. The Python Gist module utilizes the new {open_quotes}Numeric{close_quotes} module due to J. Hugunin and others. It is therefore fast and able to handle large datasets. The Gist module includes an X Windows event dispatcher which can be dynamically added (e.g., via importing a dynamically loaded module) to the Python interpreter after a simple two-line modification to the Python core. This makes fast mouse-controlled zoom, pan, and other graphic operations available to the researcher while maintaining the usual Python command-line interface. Munro`s Gist library is already freely available. The Python Gist module is currently under review and is also expected to qualify for unlimited release.
Date: May 8, 1996
Creator: Busby, L.E.
Partner: UNT Libraries Government Documents Department

ROAMing terrain (Real-time Optimally Adapting Meshes)

Description: Terrain visualization is a difficult problem for applications requiring accurate images of large datasets at high frame rates, such as flight simulation and ground-based aircraft testing using synthetic sensor stimulation. On current graphics hardware, the problem is to maintain dynamic, view-dependent triangle meshes and texture maps that produce good images at the required frame rate. We present an algorithm for constructing triangle meshes that optimizes flexible view-dependent error metrics, produces guaranteed error bounds, achieves specified triangle counts directly, and uses frame-to-frame coherence to operate at high frame rates for thousands of triangles per frame. Our method, dubbed Real-time Optimally Adapting Meshes (ROAM), uses two priority queues to drive split and merge operations that maintain continuous triangulations built from pre-processed bintree triangles. We introduce two additional performance optimizations: incremental triangle stripping and priority-computation deferral lists. ROAM execution time is proportionate to the number of triangle changes per frame, which is typically a few percent of the output mesh size, hence ROAM performance is insensitive to the resolution and extent of the input terrain. Dynamic terrain and simple vertex morphing are supported.
Date: July 1, 1997
Creator: Duchaineau, M.; Wolinsky, M.; Sigeti, D.E.; Miller, M.C.; Aldrich, C. & Mineev, M.
Partner: UNT Libraries Government Documents Department