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  • Other Sources  (486)
  • COMPUTER PROGRAMMING AND SOFTWARE  (486)
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  • 1992  (486)
  • 1
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    Multidisciplinary computational aerosciences (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: By combining CFD with the computational state-of-the-art in structural mechanics, propulsion, aeroacoustics, electromagnetics, etc., multidisciplinary computational aerosciences (MCAS) poses a formidable computational challenge requiring the use of massively parallel machines. Research efforts must accordingly be directed to three areas: (1) parallel architectures, (2) systems software, and (3) applications software; attention is presently given to the last of these, in view of developments at NASA-Ames in solution methodology, physical modeling, and multidisciplinary validation experiments.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: Computing Systems in Engineering (ISSN 0956-0521); 3; 1-4; p. 87-95.
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  • 2
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    Parallel decomposition methods for the solution of electromagnetic scattering problems (1992)
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    Publication Date: 2011-08-24
    Description: This paper contains a overview of the methods used in decomposing solutions to scattering problems onto coarse-grained parallel processors. Initially, a short summary of relevant computer architecture is presented as background to the subsequent discussion. After the introduction of a programming model for problem decomposition, specific decompositions of finite difference time domain, finite element, and integral equation solutions to Maxwell's equations are presented. The paper concludes with an outline of possible software-assisted decomposition methods and a summary.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: Electromagnetics (ISSN 0272-6343); p. 343-357.
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  • 3
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    Information, entropy and fidelity in visual communication (1992)
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    Publication Date: 2011-08-24
    Description: This paper presents an assessment of visual communication that integrates the critical limiting factors of image gathering and display with the digital processing that is used to code and restore images. The approach focuses on two mathematical criteria, information and fidelity, and on their relationships to the entropy of the encoded data and to the visual quality of the restored image.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: In: Visual information processing; Proceedings of the Meeting, Orlando, FL, Apr. 20-22, 1992 (A93-32438 12-61); p. 145-154.
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  • 4
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    Modeling and initialization of a segmented telescope (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The closely integrated design effort entailed by such prospective NASA-JPL project hardware as the Large Deployable Reflector, encompassing controls, dynamics, structures, optics, and thermal considerations, has prompted the development of the Figure Control Simulation, or 'FCSim' simulation program. This code is presently demonstrated for the case of a 7-segment, 3.65-m diameter primary mirror designed for 100-800 micron wavelengths. The optical component of the analysis can handle multispectral images, extended sources, image smear due to structural jitter, and mirror segment surface irregularities.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: In: Controls for optical systems; Proceedings of the Meeting, Orlando, FL, Apr. 21, 22, 1992 (A93-34276 13-74); p. 243-252.
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  • 5
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    Using virtual menus in a virtual environment (1992)
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    Publication Date: 2011-08-24
    Description: Virtual environment interfaces to computer programs in several diverse application areas are currently being developed. The users of virtual environments will require many different methods to interact with the environments and the objects in them. This paper reports on our use of virtual menus as a method of interacting with virtual environments. Several aspects of virtual environments make menu interactions different from interactions with conventional menus. We review the relevant aspects of conventional menus and virtual environments, in order to provide a frame of reference for the design of virtual menus. We discuss the features and interaction methodologies of two different versions of virtual menus which have been developed and used in our lab. We also examine the problems associated with our original version, and the enhancements incorporated into our current version.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: ; : TABES 93 - Annual
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  • 6
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    A quadratic-tensor model algorithm for nonlinear least-squares problems with linear constraints (1992)
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    Publication Date: 2011-08-24
    Description: A new algorithm for solving nonlinear least-squares and nonlinear equation problems is proposed which is based on approximating the nonlinear functions using the quadratic-tensor model by Schnabel and Frank. The algorithm uses a trust region defined by a box containing the current values of the unknowns. The algorithm is found to be effective for problems with linear constraints and dense Jacobian matrices.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: ACM Transactions on Mathematical Software (ISSN 0098-3500); 18; 2; p. 115-133.
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  • 7
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    Multiresolution processing for fractal analysis of airborne remotely sensed data (1992)
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    Publication Date: 2011-08-24
    Description: Images acquired by NASA's Calibrated Airborne Multispectral Scanner are used to compute the fractal dimension as a function of spatial resolution. Three methods are used to determine the fractal dimension: Shelberg's (1982, 1983) line-divider method, the variogram method, and the triangular prism method. A description of these methods and the result of applying these methods to a remotely-sensed image is also presented. The scanner data was acquired over western Puerto Rico in January, 1990 over land and water. The aim is to study impacts of man-induced changes on land that affect sedimentation into the near-shore environment. The data were obtained over the same area at three different pixel sizes: 10 m, 20 m, and 30 m.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: In: Visual information processing; Proceedings of the Meeting, Orlando, FL, Apr. 20-22, 1992 (A93-32438 12-61); p. 43-54.
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  • 8
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    SPEEDES - A multiple-synchronization environment for parallel discrete-event simulation (1992)
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    Publication Date: 2011-08-24
    Description: Synchronous Parallel Environment for Emulation and Discrete-Event Simulation (SPEEDES) is a unified parallel simulation environment. It supports multiple-synchronization protocols without requiring users to recompile their code. When a SPEEDES simulation runs on one node, all the extra parallel overhead is removed automatically at run time. When the same executable runs in parallel, the user preselects the synchronization algorithm from a list of options. SPEEDES currently runs on UNIX networks and on the California Institute of Technology/Jet Propulsion Laboratory Mark III Hypercube. SPEEDES also supports interactive simulations. Featured in the SPEEDES environment is a new parallel synchronization approach called Breathing Time Buckets. This algorithm uses some of the conservative techniques found in Time Bucket synchronization, along with the optimism that characterizes the Time Warp approach. A mathematical model derived from first principles predicts the performance of Breathing Time Buckets. Along with the Breathing Time Buckets algorithm, this paper discusses the rules for processing events in SPEEDES, describes the implementation of various other synchronization protocols supported by SPEEDES, describes some new ones for the future, discusses interactive simulations, and then gives some performance results.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: International Journal in Computer Simulation (ISSN 1055-8470); p. 251-286.
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  • 9
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    Information models of software productivity - Limits on productivity growth (1992)
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    Publication Date: 2011-08-24
    Description: Research into generalized information-metric models of software process productivity establishes quantifiable behavior and theoretical bounds. The models establish a fundamental mathematical relationship between software productivity and the human capacity for information traffic, the software product yield (system size), information efficiency, and tool and process efficiencies. An upper bound is derived that quantifies average software productivity and the maximum rate at which it may grow. This bound reveals that ultimately, when tools, methodologies, and automated assistants have reached their maximum effective state, further improvement in productivity can only be achieved through increasing software reuse. The reuse advantage is shown not to increase faster than logarithmically in the number of reusable features available. The reuse bound is further shown to be somewhat dependent on the reuse policy: a general 'reuse everything' policy can lead to a somewhat slower productivity growth than a specialized reuse policy.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: Journal of Systems and Software (ISSN 0164-1212); p. 185-201.
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  • 10
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    Small-kernel, constrained least-squares restoration of sampled image data (1992)
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    Publication Date: 2011-08-24
    Description: Following the work of Park (1989), who extended a derivation of the Wiener filter based on the incomplete discrete/discrete model to a more comprehensive end-to-end continuous/discrete/continuous model, it is shown that a derivation of the constrained least-squares (CLS) filter based on the discrete/discrete model can also be extended to this more comprehensive continuous/discrete/continuous model. This results in an improved CLS restoration filter, which can be efficiently implemented as a small-kernel convolution in the spatial domain.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: In: Visual information processing; Proceedings of the Meeting, Orlando, FL, Apr. 20-22, 1992 (A93-32438 12-61); p. 155-164.
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