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produced by SRTM. In particular, we have developed a rigorous mathematical algorithm and means to fill in missing data over rough terrain from other data sets. We illustrate this method by using a higher resolution, but globally less accurate, DEM produced by the TOPSAR airborne instrument over the Galapagos Islands to augment the SRTM data set in this area, We combine this data set with SRTM to use each set to fill in holes left over by the other imaging system. The infilling is done by first interpolating each data set using a prediction error filter that reproduces the same statistical characterization as exhibited by the entire data set within the interpolated region. After this procedure is implemented on each data set, the two are combined on a point by point basis with weights that reflect the accuracy of each data point in its original image. In areas that are better covered by SRTM, TOPSAR data are weighted down but still retain TOPSAR statistics. The reverse is true for regions better covered by TOPSAR. The resulting DEM passes statistical tests and appears quite feasible to the eye, but as this DEM is the best available for the region we cannot fully veri@ its accuracy. Spot checks with GPS points show that locally the technique results in a more comprehensive and accurate map than either data set alone. Derived from text Algorithms; Statistical Tests; Interpolation; Digital Elevation Models 20040071158 NASA Langley Research Center, Hampton, VA, USA DSP Implementation of the Retinex Image Enhancement Algorithm Hines, Glenn; Rahman, Zia-Ur; Jobson, Daniel; Woodell, Glenn; [2004]; 12 pp.; In English; SPIE Defense and Security Symposium, 12-16 Apr. 2004, Orlando, FL, USA Contract(s)/Grant(s): NNL04AA02A; NCC1-01030; 23-728-60-30 Report No.(s): SPIE-5438-37; No Copyright; Avail: CASI; A03, Hardcopy The Retinex is a general-purpose image enhancement algorithm that is used to produce good visual representations of scenes. It performs a non-linear spatial/spectral transform that synthesizes strong local contrast enhancement and color constancy. A real-time, video frame rate implementation of the Retinex is required to meet the needs of various potential users. Retinex processing contains a relatively large number of complex computations, thus to achieve real-time performance using current technologies requires specialized hardware and software. In this paper we discuss the design and development of a digital signal processor (DSP) implementation of the Retinex. The target processor is a Texas Instruments TMS320C6711 floating point DSP. NTSC video is captured using a dedicated frame-grabber card, Retinex processed, and displayed on a standard monitor. We discuss the optimizations used to achieve real-time performance of the Retinex and also describe our future plans on using alternative architectures. Author Digital Systems; Algorithms; Signal Processing; Signal Analyzers; Image Enhancement 20040073488 NASA Langley Research Center, Hampton, VA, USA A Discontinuous Galerkin Method for Parabolic Problems with Modified hp-Finite Element Approximation Technique Kaneko, Hideaki; Bey, Kim S.; Hou, Gene J. W.; [2004]; 22 pp.; In English Contract(s)/Grant(s): NAG1-01092; NAG1-2300; No Copyright; Avail: CASI; A03, Hardcopy A recent paper is generalized to a case where the spatial region is taken in R(sup 3). The region is assumed to be a thin body, such as a panel on the wing or fuselage of an aerospace vehicle. The traditional h- as well as hp-finite element methods are applied to the surface defined in the x-yvariables, while, through the thickness, the technique of the p-element is employed. Time and spatial discretization scheme based upon an assumption of certain weak singularity of double vertical line u(sub t) double vertical line 2, is used to derive an optimal a priori error estimate for the current method. Author Galerkin Method; Finite Element Method; Parabolic Differential Equations; Approximation 20040073489 Old Dominion Univ., Norfolk, VA, USA Error Analysis for Discontinuous Galerkin Method for Parabolic Problems Kaneko, Hideaki; May 24, 2004; 4 pp.; In English Contract(s)/Grant(s): NAG1-01092; No Copyright; Avail: CASI; A01, Hardcopy In the proposal, the following three objectives are stated: (1) A p-version of the discontinuous Galerkin method for a one dimensional parabolic problem will be established. It should be recalled that the h-version in space was used for the discontinuous Galerkin method. An a priori error estimate as well as a posteriori estimate of this p-finite element discontinuous Galerkin method will be given. (2) The parameter alpha that describes the behavior double vertical line u(sub t)(t) double vertical line 2 was computed exactly. This was made feasible because of the explicitly specified initial condition. For practical 217
heat transfer problems, the initial condition may have to be approximated. Also, if the parabolic problem is proposed on a multi-dimensional region, the parameter alpha, for most cases, would be difficult to compute exactly even in the case that the initial condition is known exactly. The second objective of this proposed research is to establish a method to estimate this parameter. This will be done by computing two discontinuous Galerkin approximate solutions at two different time steps starting from the initial time and use them to derive alpha. (3) The third objective is to consider the heat transfer problem over a two dimensional thin plate. The technique developed by Vogelius and Babuska will be used to establish a discontinuous Galerkin method in which the p-element will be used for through thickness approximation. This h-p finite element approach, that results in a dimensional reduction method, was used for elliptic problems, but the application appears new for the parabolic problem. The dimension reduction method will be discussed together with the time discretization method. Author (revised) Error Analysis; Galerkin Method; Parabolic Differential Equations 20040073529 California Inst. of Tech., Pasadena, CA, USA Dynamical Chaos in the Wisdom-Holman Integrator: Origins and Solutions Rauch, Kevin P.; Holman, Matthew; The Astronomical Journal; 1999; Volume 117, pp. 1087-1102; In English Contract(s)/Grant(s): NAG5-10365; Copyright; Avail: Other Sources; Abstract Only We examine the nonlinear stability of the Wisdom-Holman (WH) symplectic mapping applied to the integration of perturbed, highly eccentric (e-0.9) two-body orbits. We find that the method is unstable and introduces artificial chaos into the computed trajectories for this class of problems, unless the step size chosen 1s small enough that PeriaPse is always resolved, in which case the method is generically stable. This ‘radial orbit instability’ persists even for weakly perturbed systems. Using the Stark problem as a fiducial test case, we investigate the dynamical origin of this instability and argue that the numerical chaos results from the overlap of step-size resonances; interestingly, for the Stark-problem many of these resonances appear to be absolutely stable. We similarly examine the robustness of several alternative integration methods: a time-regularized version of the WH mapping suggested by Mikkola; the potential-splitting (PS) method of Duncan, Levison, Lee; and two original methods incorporating approximations based on Stark motion instead of Keplerian motion. The two fixed point problem and a related, more general problem are used to conduct a comparative test of the various methods for several types of motion. Among the algorithms tested, the time-transformed WH mapping is clearly the most efficient and stable method of integrating eccentric, nearly Keplerian orbits in the absence of close encounters. For test particles subject to both high eccentricities and very close encounters, we find an enhanced version of the PS method-incorporating time regularization, force-center switching, and an improved kernel function-to be both economical and highly versatile. We conclude that Stark-based methods are of marginal utility in N-body type integrations. Additional implications for the symplectic integration of N-body systems are discussed. Author Eccentric Orbits; Chaos; Robustness (Mathematics); Many Body Problem; Kernel Functions 20040073569 Naval Postgraduate School, Monterey, CA Sensitivity Analysis for an Assignment Incentive Pay in the U.S. Navy Enlisted Personnel Assignment Process in a Simulation Environment Logemann, Karsten; Mar. 2004; 90 pp.; In English; Original contains color illustrations Report No.(s): AD-A422386; No Copyright; Avail: CASI; A05, Hardcopy The enlisted personnel assignment process is a major part in the USA Navy’s Personnel Distribution system. It ensures warfighters and supporting activities receive the right sailor with the right training to the right billet at the right time (R4) and is a critical element in meeting the challenges of Seapower 21 and Global CONOPS. In order to attain these optimal goals the ways-to-do-it need to be customer-centered and should optimize both, the Navy’s needs and the sailor’s interests. Recent studies and a detailing pilot in 2002 used a web-based marketplace with two- sided matching mechanisms to accomplish this vision. This research examines the introduction of an Assignment Incentive Pay (AlP) as part of the U,S, Navy’s enlisted personnel assignment process in a simulation environment. It uses a previously developed simulation tool, including the Deferred Acceptance (DA) and the Linear Programming (LP) matching algorithm to simulate the assignment process. The results of the sensitivity analysis suggested that the Navy should mainly emphasize sailor quality rather than saving AIP funds in order to maximize utility and the possible matches When adopting such an introduction policy also the percentage of unstable matches under the LP as the matching algorithm was reduced. DTIC Algorithms; Billets; Incentives; Navy; Personnel; Sensitivity Analysis; Simulation 218
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NASA STI Program ... in Profile Sin
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NASA STI Availability Information N
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Geosciences 43 Earth Resources and
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SCIENTIFIC AND TECHNICAL AEROSPACE
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iced airfoils. The software was app
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concerning the operation of aircraf
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nitrides. There are over 60 of thes
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With the increasing use of fiber-re
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20040071101 Texas Univ., Austin, TX
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20040073643 Naval Research Lab., St
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20040074155 Air Force Inst. of Tech
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instrumentation is needed to improv
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Perched atop a Long March (CZ-2F) l
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to analyze model with the dense mes
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network. To achieve these goals, a
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The space radiation environment can
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20040074322 NASA Langley Research C
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experience gained from the morning
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20040070749 Eagle-Picher Industries
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(IPD) program, and the Hybrid Sound
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eactions (with group balance when p
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ehavior and the resulting damage me
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single-walled carbon nanotubes (SWN
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As part of an ongoing effort to dev
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A critical analysis of the CCSD(T)
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zone permeability. Two full-scale P
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changes can have drastic affects. N
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needed for validation of a detailed
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20040073730 Stanford Univ., Stanfor
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20040073775 Army Cold Regions Resea
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Prior studies of Alloy 600 and Allo
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esearch. The Lorentz force induced
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ship’s hull, to generate pitch mo
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20040073644 Stevens Inst. of Tech.,
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28 PROPELLANTS AND FUELS Includes r
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Biological and Physical Space Resea
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20040068297 National Telecommunicat
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The Navy-Marine Corps team envision
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y applying the doctrine of maneuver
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solutions. Single and multi-stage p
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of the NMOS transistors with an n-c
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20040070924 NASA Marshall Space Fli
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20040073555 State Univ. of New York
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qubits in quantum computers. It has
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20040068170 NASA Ames Research Cent
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different flow types are proposed.
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20040070802 QSS Group, Inc., Clevel
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experimental dataset provides essen
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This final report describes the pro
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vapor line and liquid line are made
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A general model is presented that a
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detectors or highly cooled (about 4
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Architecture with Uncooled TIR Dete
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potential for inducing catastrophic
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discuss the technical issues involv
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20040073759 Michigan Technological
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solution. The sensor responds prope
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noise. Multiplexers for large numbe
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20040074303 Cologne Univ., Germany
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20040073556 Florida State Univ., Ta
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otor and blades, were found to be i
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local wave-form changes associated
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limited number of geometries. The r
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Commercial Instrument Validation La
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20040071082 Lockheed Martin Space O
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esolution specifications for new se
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and resistance of the cell has rema
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20040070745 ElectroChem, Inc., Wobu
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cell potential vs. current density
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20040070987 Lawrence Livermore Nati
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in the Earth’s climate system. Th
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the scientific questions of the rol
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20040073763 Georgia Tech Research I
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frontal systems approaching the Nam
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effects of climate change and urban
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forecasting weather in the vast, da
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that 100 tg of dust are transported
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effort to study the monsoons. The o
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looking at data files generated by
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Body weights of rat pups reared dur
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maltose, sucrose, starch and D-mann
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changes in SFOAEs due to noise can
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20040073582 Scripps Research Inst.,
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Page 202 and 203: Simulation (NPSS) software package.
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Page 250 and 251: tension. The binder material with m
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Page 262 and 263: We discuss the temporal and spectra
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1979, when we decided it was time t
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in our competitive position resulti
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also work to foster increased trust
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of interacting with others while wo
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20040070865 Ford Motor Co., Dearbor
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and industry in the nation’s aero
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20040073532 Defense Manpower Data C
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it was found that information flow
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provided for consideration in the s
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This viewgraph presentation provide
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applications are re-factored into t
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where its calibration is maintained
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status of the development of SOFIA
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separation roughly constant. The li
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esonances involving the longitude o
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15-17, 2003 and hosted by the Insti
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scientific enthusiasm amongst Europ
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Bolocam, MAMBO) and the surveys of
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20040074293 Naval Research Lab., Wa
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The questions of greatest scientifi
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walls and more. I will also list wh
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al., which suggest considerable bla
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as is often invoked for black hole
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We report on the timing analysis of
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Space Flight Center, Greenbelt, MD,
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20040073754 Air Force Research Lab.
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A possible accretion model associat
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spectrally resolved application, la
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composition with unprecedented wave
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20040068206 L-1 Standards and Techn
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individual flares. In addition, RHE
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93 SPACE RADIATION Includes cosmic
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perigee observations from 1 Decembe
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ABBREVIATIONS MSFC Space Station Pr
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AEROSPACE VEHICLES Application of S
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ANNOTATIONS An Annotated Bibliograp
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AUTOMATIC CONTROL Automated Modern
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BLOOD PRESSURE Flow Redistribution
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CATALOGS (PUBLICATIONS) The BATSE E
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COMBAT An Improvement to Situationa
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Speech Recognition Software; An Alt
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Proceedings of the Autonomous Vehic
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Effects of Fatigue on Simulation-Ba
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DOPPLER RADAR Interference Estimati
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ELECTROMAGNETIC WAVE TRANSMIS- SION
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EUROPE Future Far-IR Mission and Su
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Application of Non-Deterministic Me
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GALACTIC RADIATION A New Method to
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GUIDANCE SENSORS Advanced Video Gui
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HVOF THERMAL SPRAYING Replacement o
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INDUSTRIES The 10-Year Remote Sensi
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ION BEAMS Understanding Particle De
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LEVITATION An Overview of the Mater
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MAMMALS Coordinate Expression of th
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Structural Fluctuation and Thermoph
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MINERALOGY Perovskite Manganites: A
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NEBULAE IR Fine-Structure Line Sign
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OPTICAL MEASUREMENT Development of
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PHYSIOLOGICAL EFFECTS Characterizat
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PROCUREMENT Metrics to Monitor Gove
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RADAR CROSS SECTIONS Bandwidth Limi
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Automated Rendezvous and Capture Sy
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SEALING Strain-Life Assessment of G
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SMOG Brown Cloud Pollution and Smog
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SPACE TRANSPORTATION SYSTEM FLIGHTS
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STRESS CONCENTRATION Development of
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TANTALUM Densification of nanocryst
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Energy Release Rate in a Constraine
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TWO DIMENSIONAL MODELS An Investiga
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Properties of Longitudinal Flux Tub
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Abbas, M. M. Laboratory Experiments
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Auyeung, T. P. Design of a High Hea
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Bey, Kim S. A Discontinuous Galerki
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Brown, T. Individual Radiation Prot
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Chen, Yuan A Chip and Pixel Qualifi
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Crochetiere, William J. On the Use
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Dunn, J. Spectral and Imaging Chara
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Fournet, R. Chemical Kinetic Charac
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Giulianetti, Demo J. Aviation Syste
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Harris, Robert Comparing Methods fo
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Hua, Inez Environment Partitioning
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Khairoutdinov, M. Cloud-Resolving M
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LaConti, A. Some Recent Studies Wit
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Little, James E. Fuel-Flexible Gas
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Marsic, Damien Spirochaeta American
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Montgomery, Edward E, IV The Develo
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Nitao, E. N. Parameterization of In
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Phan, Kandy Q. Design and Implement
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Ren, Libo Dynamic Punch Shear Behav
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Schatz, Josh The Use of LS-DYNA in
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Sokolov, Sergey Assembly of Functio
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Talley, D. G. The Development of a
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Varakala, S. Facilitating Intellige
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Whipple, Kelin X. Relief Evolution
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Yen, Chian-Fong Dynamic Punch Shear
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