1–50 von 163 Ergebnissen
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    Research on the Support and Gravitational Deformation of Large Aperture Primary Mirror of Space Telescopes

    Peng, Yang-Lin / Dai, Yi-Fan / Chen, Shan-Yong | Tema Archiv | 2012
    telescopes are used in weightless environments, which is different from the ground environment for optical machining and testing. Therefore the ...

    Damage detection and leakage alert of fiber composite wrapped tank for high pressure hydrogen storage

    Sun, Xiao-Yan / Huston, D.R. / Qin, Quan et al. | Tema Archiv | 2008
    Car manufactures are turning to high pressure hydrogen storage for on-broad power applications. Fiber-composite-wrapped high pressure ...

    Polarization measurements of automobile paints

    Goldstein, D.H. | Tema Archiv | 2008
    micrometer. Depolarization indices for all polarimetric measurements were calculated. ...

    Inspection of Lamb waves in carbon fiber composites using shearographic interferometry

    Focke, O. / Hildebrand, A. / Kopylow, C. von et al. | Tema Archiv | 2008
    . The optical implementation of both techniques within the interferometically setup and experimental results with the possibility to measure the ...

    Lane detection system for autonomous vehicle navigation

    Bhatia, A. | Tema Archiv | 2007
    This paper represents the vision processing solution used for lane detection by the Insight Racing team, for DARPA Grand Challenge 2007 ...

    Terminal phase visual position estimation for a tail-sitting vertical takeoff and landing UAV via a Kalman filter

    Tsai, A.C. / Gibbens, P.W. / Stone, R.H. | Tema Archiv | 2007
    Computer vision has been an active field of research for many decades; it has also become widely used for airborne applications in the last ...

    An adaptive localization system for outdoor/indoor navigation for autonomous robots

    Pacis, E.B. / Sights, B. / Ahuja, G. et al. | Tema Archiv | 2006
    of autonomous navigation for mobile robots has targeted either outdoor or indoor scenarios, but not both, which is not how humans operate ...

    Influence of particle size on the vibration of plates loaded with granular material

    Turner, J.A. / Kang, Wonmo / Bobaru, F. et al. | Tema Archiv | 2006
    Acoustic methods of land mine detection rely on the vibrations of the top plate of the mine in response to sound. For granular soil (e.g ...

    High-fidelity simulation capability for virtual testing of seismic and acoustic sensors

    Wilson, D.K. / Moran, M.L. / Ketcham, S.A. et al. | Tema Archiv | 2005
    This paper describes development and application of a high-fidelity, seismic/acoustic simulation capability for battlefield sensors. The ...

    Fusion of visual and eddy current inspection results for the evaluation of corrosion damage in aircraft lap joints

    Liu, Zheng / Forsyth, D.S. / Safizadeh, S. et al. | Tema Archiv | 2005
    laser displacement sensor is used to provide the reference. The EOL estimation is for the total material loss while the eddy current or pulsed ...

    Unattended ground sensor based on fiber Bragg grating technology

    Zhang, Yan / Li, Sanguo / Yin, Zhifan et al. | Tema Archiv | 2005
    In this paper we have demonstrated an unattended seismic wave sensor based on the optical fiber Bragg grating (FBG) sensing technology. The ...

    Development of an active twist rotor blade with distributed actuation and orthotropic material

    Wierach, P. / Riemenschneider, J. / Keye, S. | Tema Archiv | 2005
    Individual blade control (IBC) as well as higher harmonic control (HHC) for helicopter rotors promises to be a method to increase flight ...

    Optimized grouping of piezoelectric actuators on a flexible fin

    Rader, A. / Yousefi-Koma, A. / Afagh, F. et al. | Tema Archiv | 2005
    This paper presents a new method used to determine the optimum group configuration of any specified number of piezoelectric actuators for ...

    GSIM: a simulator for missile seekers

    Lindgren, M. / Engvall, A. / Kihlen, R. | Tema Archiv | 2004
    A simulator (GSIM) for missile seekers that can be used as a general tool in missile seeker performance analysis has been developed. The ...

    A probabilistic approach for mine burial prediction

    Barbu, C. / Valent, P. / Richardson, M. et al. | Tema Archiv | 2004

    Estimating the backscatter spectral dependence and relative concentration for multiple aerosol materials from lidar data

    Warren, R.E. / Vanderbeek, R.G. | Tema Archiv | 2004
    section coefficients, backscatter in the case of aerosols and absorptivity for vapors, be known in advance. While this typically is a reasonable ...

    Distortions of laser beams by turbulent aero-engine jet: experiment and numerical modeling

    Borisova, N.F. / Ivanova, I.V. / Sirazetdinov, V.S. | Tema Archiv | 2004
    The experimental studies of spatial characteristics for laser beams disturbed by a turbulent aero-engine jet were carried out. The angular ...

    Spatial modeling of occlusion patterns applied to the detection of surface-laid mines

    Lundberg, M.P. / Brown, C.L. / Uppsall, M.S. | Tema Archiv | 2004

    Corrosion damage detection with piezoelectric wafer active sensors

    Thomas, D.T. / Welter, J.T. / Giurgiutiu, V. | Tema Archiv | 2004
    has become a priority issue for today's Air Force. One of the most critical structural problems is corrosion. In fact the KC-135 now costs$1.2 ...

    Aircraft interior ANC with flat panel speakers

    Gerner, C. / Sachau, D. / Breitbach, H. | Tema Archiv | 2004
    In a propeller driven aircraft the main source for internal noise are tonal disturbances caused by the propeller blades that are passing ...

    Probabilistic neural networks for infrared imaging target discrimination

    Cayouette, P. / Labonte, G. / Morin, A. | Tema Archiv | 2003
    The next generation of infrared imaging trackers and seekers will allow for the implementation of more sophisticated and smarter tracking ...

    Robustness of features for automatic target discrimination in high resolution polarimetric SAR data

    Broek, A. van den / Dekker, R. / Steeghs, P. | Tema Archiv | 2003
    We have studied the robustness of features against aspect variability for the purpose of target discrimination using polarimetric 35 Ghz ...

    Asymptotic performance of ATR in infrared images

    Ceritoglu, C. / Bitouk, D. / Miller, M.I. et al. | Tema Archiv | 2003
    In this study, the asymptotic performance analysis for target detection-identification through Bayesian hypothesis testing in infrared ...

    Multitarget-multisensor data association using the tree-reweighted max-product algorithm

    Chen Lei / Wainwright, M.J. / Cetin, M. et al. | Tema Archiv | 2003
    -sized applications. We describe an iterative method for solving the optimal data association problem in a distributed fashion; the work exploits ...

    Fuzzy logic resource manager: decision tree topology, combined admissible regions, and the self-morphing property

    Smith, J.F. III | Tema Archiv | 2003
    incorporation of expertise. Genetic algorithm based optimization is conducted to determine the form of the membership functions for the fuzzy root ...

    Intelligent sensor management to minimize detection error

    Wegrzyn, J.W. / Kastella, K.D. | Tema Archiv | 2003
    location to test next. For non-myopic optimization, graph search techniques are used. When the sensor output is thresholded, the performance ...

    Sensitivity of fusion performance to classifier model variations

    Goebel, K.F. | Tema Archiv | 2003
    is how the output should be distributed, in particular for multi-class continuous output classifiers. Using the wrong distribution may lead ...

    Fragility analysis of transportation networks

    Murachi, Y. / Orikowski, M.J. / Dong, Xuejiang et al. | Tema Archiv | 2003
    -earthquake traffic behavior in animation. This will assist emergency response professionals to gain pre-event insight for developing optimal ...

    Efficient particle filters for joint tracking and classification

    Gordon, N.J. / Maskell, S. / Kirubarajan, T. | Tema Archiv | 2002
    designed to derive behavior characteristics or include them as part of their output. Thus, there is potential scope for both applying target type ...

    Toward dynamic model-based prognostics for transmission gears

    Wang, Wenyi | Tema Archiv | 2002
    This paper presents a novel methodology for the diagnosis and prognosis of crucial gear faults, such as gear tooth fatigue cracking ...

    New initial basic probability assignments for multiple classifiers

    Rheaume, F. / Jousselme, A.L. / Grenier, D. et al. | Tema Archiv | 2002
    classification methods exist but none of them can return always right results for any given kind of data. Each classifier behaves differently, having its ...

    Stochastic search and graph techniques for MCM path planning

    Piatko, C.D. / Diehl, C.P. / McNamee, P. et al. | Tema Archiv | 2002
    We have been developing path planning techniques to look for paths that balance the utility and risk associated with different routes ...

    Fourier descriptor features for acoustic landmine detection

    Keller, J.M. / Cheng, Zhanqi / Gader, P.D. et al. | Tema Archiv | 2002
    obtainable from the sensors used for landmine detection. The Acoustic Sensing Technology (AST), which uses a Laser Doppler Vibrometer (LDV) that ...

    Wavelets for ultrasonic echo identification in aircraft fuel tanks

    Sadok, M. | Tema Archiv | 2002
    to gauge fuel in commercial and military aircraft. Ultrasonics are among other techniques that were tested for such purposes. Generally, in ...

    Real-time 2D floating-point fast Fourier transforms for seeker simulation

    Chamberlain, R. / Lord, E. / Shand, D.J. | Tema Archiv | 2002
    operations on a single modest sized image making it impractical for realtime hardware-in-the-loop systems, until now. This paper outlines the ...

    Probability-of-detect-based beam pointing for multitarget tracking with electronically scanned radars

    Register, A.H. / Brown, G.C. / Blair, W. | Tema Archiv | 2002
    very important. Two opportunities for conserving radar resources that have not been fully exploited when tracking closely-spaced objects with ...

    Model reduction and substructuring for computing responses of structures containing frequency-dependent viscoelastic materials

    Germes, S. / Van Herpe, F. | Tema Archiv | 2002
    systems, there is still a need for finite element models capable of predicting the frequency response of structures containing VEM. We address in ...

    Modeling soft factors in computer based wargames

    Alexander, S.M. / Ross, D.O. / Vinarskai, J.S. et al. | Tema Archiv | 2002
    developed for the entertainment industry, most of these advances have centered on the graphics, sound, and user interfaces integrated into these ...

    Results from a forward-looking GPR mine detection system

    Kositsky, J. / Cosgrove, R. / Amazeen, C.A. et al. | Tema Archiv | 2002
    each image. Finally, multilook processing combined the results from several independent views of the same mines (at various ranges). For buried ...

    Applying model abstraction techniques to the advanced low altitude radar model (ALARM)

    Plotz, G.A. / Dibble, S. | Tema Archiv | 2002
    radar model for simulating the volume detection capability of low flying targets within a digitally simulated environment. Due to the complexity ...

    Land mine detection with an ultra-wideband SAR system

    Andrieu, J. / Gallais, F. / Mallepeyre, V. et al. | Tema Archiv | 2002
    PULSAR is an ultra wide band (UWB) short pulse Radar developed by the CELAR (French Technical Center for Armament Electronics) and the ...

    Integrated spatiotemporal multiple sensor fusion system design

    Chen, Hai-Wen / Olson, T. | Tema Archiv | 2002
    more sensors. This allows for the collection of sequential segments or frames of temporal information per sensor as well as across various ...

    Finite element analysis and performance evaluation of synthetic jet actuators

    Ro, Jeng-Jong / Wu, K.C. | Tema Archiv | 2002
    The primary objective of active flow control research is to develop a cost-effective technology that has the potential for revolutionary ...

    Factoring a priori classifier performance into decision fusion

    Goebel, K. / Mysore, S.P. | Tema Archiv | 2002
    than a less reliable one without discounting the less reliable one completely. For a multi-class classifier, the reliability per class must be ...

    Parametric investigation of ground roughness on the interference between AP-mine and clutter-object buried under two-dimensional random rough surfaces

    El-Shenawee, M. / Rappaport, C.M. | Tema Archiv | 2002
    . Using the Method of Moment (MoM), the new integral equations are transformed into a linear system of equations to be solved for the unknown ...

    Active structural acoustic control: numerical modeling, robust controller design and experimental validation

    Deuble, F. / Hofmann, C. / Kroplin, B. et al. | Tema Archiv | 2002
    microphones is investigated as an approach to this problem. For this a generic experiment has been set up. One objective of the work is to find and ...

    Optical detection of land mines at FOI

    Sjokvist, S. / Uppsall, M. / Nyberg, S. et al. | Tema Archiv | 2001
    the origin of detectable optical signatures for choosing the most favorable conditions for detection. Measurements in test beds and ...

    Nonlinear feature extraction applied to ISAR images of targets for classification

    Maskall, G.T. / Webb, A.R. | Tema Archiv | 2001
    This paper examines the use of a nonlinear dimensionality reduction scheme for feature extraction applied to ISAR images of armored targets ...