1–50 of 164 hits
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    Dynamic characterization of a lightweight, highly maneuverable spacecraft using modal and finite element analyses

    Manning, P.A. / Burdick, R.B. / Woehrle, T.G. | Tema Archive | 1993
    deflection shapes for each natural mode of the mock-up. The experimental modal parameters were compared with the parameters obtained through modal ...

    Finite element analysis of the thermal characteristics of an automotive powertrain controller

    Romanczuk, C.S. / Burcham, S.W. / Evans, J.L. et al. | Tema Archive | 1993
    at various power levels inputs. The powertrain controller evaluated for this program uses a single layered insulated metal substrate for ...

    Fuzzy logic and neural networks in space applications

    Jani, Y. / Aldridge, J. | Tema Archive | 1993
    constructed around the idea of a set in which the membership is a matter of degree rather than yes or no. Though known for more than 30 years, the ...

    The steady state response calculation and damping vibration analysis of shrouded blades

    Ren, Yungsheng / Zhu, Demao | Tema Archive | 1994
    . The related computer programs are written in fortran 77. The numeric analysis for the blades is completed. ...

    Neural network for track initiation and maintenance

    Winter, M. / Schmidlin, V. / Favier, G. | Tema Archive | 1997
    Classical methods for multiple target tracking (such as the Joint Probabilistic Data Association (JPDA) Filter or the Nearest Neighbor ...

    Development of gazing algorithms for tracking oriented recognition

    Wang, S. / Chen, G. / Sapounas, D. et al. | Tema Archive | 1997
    This paper describes the development of a computer vision system that hosts a suite of gazing algorithms for tracking oriented recognition ...

    Adaptive multi-sensor integration for mine detection

    Baker, J.E. | Tema Archive | 1997
    application, while increasing the quality of the final result and provides a quantitative measure for comparing competing MSI techniques and sensor ...

    Constructing unified identification algorithms using a small number of observations for adaptive control and navigation systems

    Fursov, V.A. | Tema Archive | 1997
    The paper deals with the development of identification algorithms for adaptive control systems, with specific features related to the ...

    Three-dimensional anthropometric techniques applied to the fabrication of burn masks and the quantification of wound healing

    Whitestone, J.J. / Geisen, G.R. / McQuiston, B.K. | Tema Archive | 1997
    for successful mission performance of weapon systems, including cockpits, protective equipment, and clothing. The application of human body ...

    Missile-tracking algorithm using target-adapted spatio-temporal wavelets

    Mujica, F. / Leduc, J.P. / Smith, M.J.T. et al. | Tema Archive | 1997

    Qualitative landmark recognition using visual cues

    Poovendran, R. / Speigle, S. / Srinivasan, S. et al. | Tema Archive | 1997
    This paper presents a qualitative approach based on visual cues for man-made landmark recognition in outdoor as a navigational aid. This ...

    Quantifying performance of mine detectors with fewer than 10000 targets

    Andrews, A.M. / George, V. / Altshuler, T.W. | Tema Archive | 1997
    on small areas. Suggestions for improving results are given. We can estimate the uncertainty in a probability of detection measurement with a ...

    Passive position location using Bayes' conditional density filter

    Challa, S. / Faruqi, F.A. | Tema Archive | 1997

    Detection of buried land mines using a casi hyperspectral imager

    McFee, J.E. / Ripley, H.T. | Tema Archive | 1997
    Experiments were conducted to estimate the probability of detection (PD) and false alarm rate (FAR) for detection of buried mines using a ...

    A radiometric sensor performance model including atmospheric and infrared clutter effects

    Richter, R. / Davis, J.S. / Duggin, M.J. | Tema Archive | 1997
    The computer code SENSAT developed for radiometric investigations in remote sensing was extended to include two statistical clutter models ...

    An improved decision-theoretic approach to the optimum detection of mines

    Collins, L. / George, V. / Altshuler, T. et al. | Tema Archive | 1997
    for a known environment to incorrect prior knowledge of uncertain parameters in the demining scenario, and the robustness of performance and ...

    Comparison tools for assessing the microgravity environment of space missions, carriers, and conditions

    DeLombard, R. / Hrovat, K. / Moskowitz, M.E. et al. | Tema Archive | 1998
    systems. The need for comparisons between different missions, vehicles, conditions, etc. has been addressed by the two new processes described in ...

    Feedback control for communication and traffic networks

    Ball, J.A. / Day, M.V. / Kachroo, P. et al. | Tema Archive | 1998
    studied by the authors and solutions for these have been obtained; and (3) traffic routing. Traditionally both kinds of network systems have been ...

    Fault tolerant action selection for planetary rover control

    Huntsberger, T. | Tema Archive | 1998
    mission to Mars in July of 1997. Sojourner stayed within a 50 meter radius of the Pathfinder Lander. Current NASA plans call for extended year ...

    Area-based results for mine detection

    Gelenbe, E. / Kocak, T. | Tema Archive | 1998
    The cost, and the closely related length of time, spent in searching for mines or unexploded ordnance are largely determined by the number ...

    Suitability of scene matching for unmanned vehicle navigation

    Ding, Mingyue / Xiao, Yijun / Ai, Hao-Jun et al. | Tema Archive | 1998
    the reference map. Due to the sensitivity of scene imaging, only some special zones of the unmanned vehicle's planned area are suitable for ...

    Demodulation schemes for vibrometers and associated effects on target classification

    Ruck, B. / Lewis, H. / Rogoyski, A. et al. | Tema Archive | 1998
    schemes upon several critical classification cues, for example signal-to-noise ratio, frequency and bandwidth. These cues help to parameterize the ...

    Time-frequency signatures based on a fuzzy-cluster representation as a means for automatic classification of targets buried underground

    Strifors, H.C. / Abrahamson, S. / Gustafsson, A. et al. | Tema Archive | 1998
    features in the 2D time-frequency domain are viewed as the target signatures. For target identification, a signature representation should display ...

    Autonomous search for mines. II. Hierarchical search using sensory data

    Cao, Yonghuan / Gelenbe, E. | Tema Archive | 1998

    Information processing for aerospace structural health monitoring

    Lichtenwalner, P.F. / White, E.V. / Baumann, E.W. | Tema Archive | 1998
    monitoring (SHM) system. These include artificial intelligence techniques such as neural networks, expert systems, and fuzzy logic for nonlinear ...

    Feature extractor and search engine for automatic object recognition

    Freire, J. / Correia, B. | Tema Archive | 1998

    Spatio-temporal wavelets and tracking in noisy environments

    Mujica, F. / Murenzi, R. / Smith, M.J.T. | Tema Archive | 1998
    assumed to be obtained from an optical sensor mounted on the interceptor missile, where the goal of the interceptor is to neutralize the target ...

    Optimization of the Hubble Space Telescope fine guidance sensor target-acquisition parameters

    Abramowicz-Reed, L. / Ftaclas, C. / Chisholm, K.P. | Tema Archive | 1998
    Monte Carlo simulator used in deriving the optimized values for the FGS acquisition and discusses methods for testing the new parameters prior ...

    A skewed approach to filtering

    Julier, S.J. | Tema Archive | 1998
    The dynamics of many physical system are nonlinear and nonsymmetric. The motion of a missile, for example, is strongly determined by ...

    Accelerated convergence of neural network system identification algorithms via principal component analysis

    Hyland, D.C. / Davis, L.D. / Denoyer, K. | Tema Archive | 1998
    While significant theoretical and experimental progress has been made in the development of neural network-based systems for the autonomous ...

    Vibration control of a flexible beam through a smart structure concept

    Goud, A.P. / Umapathy, M. | Tema Archive | 1998
    Active control has become important in structural systems as an efficient tool for vibration suppression. A cantilever beam has been chosen ...

    Prediction of buried mine-like target radar signatures using wideband electromagnetic modeling

    Warrick, A.L. / Azevedo, S.G. / Mast, J.E. | Tema Archive | 1998
    Current ground penetrating radars (GPR) have been tested for land mine detection, but they have generally been costly and have poor ...

    Fast route-planning approach to aircraft

    Yi Min / Ding, Mingyue / Zhou, Chenping | Tema Archive | 1998

    Concrete object recognition by multispectral systems

    Zlotnikov, K.A. | Tema Archive | 1998
    for the selection of concrete surfaces, such as runways, against natural backgrounds. The reliability of the object recognition process ...

    Multiresolution motion estimation and target detection

    Karlsen, R.E. / Gorsich, D.J. / Gerhart, G.R. | Tema Archive | 1998
    can cover the field of regard much more quickly than foveal vision. In this paper, we present two hierarchical multiresolution methods for ...

    Radiated noise control via structural vibration control

    Varadan, V.V. / Gopinathan, S.V. / Lim, Young-Hun et al. | Tema Archive | 1998
    actuators and sensors is addressed. A hybrid approach using a finite element formulation for the radiating walls of the enclosure is developed. We ...

    Identification of mechanical properties of composite lamina using a distributed piezoelectric transducer

    Hong, Danbi / Ryou, Jung-Kyu / Park, Sungho et al. | Tema Archive | 1998
    G12, are design parameters for the identification process. The proposed method is applied to predict the dynamic behavior of laminated ...

    Linear magnetic position sensor for automotive applications

    Liu, Z. / Tian, L. / Parham, J. et al. | Tema Archive | 1999
    In this work, a linear position sensor with a Hall effect element for automotive applications is presented. The work involves the design of ...

    A time-domain simulation for evaluating smart wing concepts for reducing gust loads

    Hall, B.D. / Preidikman, S. / Mook, D.T. et al. | Tema Archive | 1999
    A numerical simulation for evaluating methods of predicting and controlling the response of an elastic wing in an airstream is discussed ...

    Adaptive sequential algorithms for detecting targets in a heavy IR clutter

    Tartakovsky, A. / Kligys, S. / Petrov, A. | Tema Archive | 1999
    discusses adaptive sequential detection methods which exploit 'track-before-detect' technology for detection low-SNR targets in IR search and track ...

    Bayesian networks for satellite payload testing

    Przytula, K.W. / Hagen, F. / Yung, K. | Tema Archive | 1999
    exists for a software tool, which would assist engineers in production and operation of satellite systems. We have designed and implemented a ...

    Principal components analysis: extension to scaling for application to images acquired at various ranges

    Cook, G. / O'Brien, G. | Tema Archive | 1999
    This paper builds on the method of principal components analysis and its use for obtaining from a set of training image vectors a basis in ...

    Bayesian signal detection for multiple aspect targets with an uncertain look angle

    Rasimas, J.G. / Tantum, S.L. / Nolte, L.W. | Tema Archive | 1999
    An optimal signal detection theory approach is presented for the determination of the presence or absence of a target observed at multiple ...

    Scannerless imaging ladar using a laser diode illuminator and FM/CW radar principles

    Stann, B. / Giza, M. / Robinson, D. et al. | Tema Archive | 1999
    Research Laboratory for reconnaissance applications. Range information is obtained by a frequency modulation/continuous wave (FM/CW) radar ...

    Statistical fusion of GPR and EMI data

    Weisenseel, R.A. / Karl, W.C. / Castanon, D.A. et al. | Tema Archive | 1999
    In this paper, we develop a statistical detection system exploiting sensor fusion for the detection of plastic A/P mines. We design and ...

    Target detection in infrared and SAR terrain images using a non-Gaussian stochastic model

    Chapple, P.B. / Bertilone, D.C. / Caprari, R.S. et al. | Tema Archive | 1999
    detection as a problem in statistical decision theory. The current paper follows this approach in developing a new stochastic model for images of ...

    An adaptive underwater target classification system

    Azimi-Sadjadi, M.R. / Yao, D. / Dobeck, G.J. | Tema Archive | 1999
    This paper presents a new adaptive underwater target classification system for in situ robust classification in the presence of ...

    Mine detection using model-trained multi-resolution neural networks and variational methods

    Szymczak, W.G. / Guo, W. | Tema Archive | 1999
    for training purposes. This under-representation of targets can cause missed classifications and a higher false alarm ratio in the presence of ...

    Stochastic simulation of ocean waves and their effect on microwave scattering

    Jean-Pierre, A. / Pierson, W.J. / Groves, G.W. | Tema Archive | 1999
    components for use in studies of radar sea scattering. The effects of Monte Carlo simulations of linear and nonlinear waves on radar backscatter from ...