Now showing items 2975-2994 of 3721

    • S4W: Globally Optimized Design of Wireless Communication Systems 

      He, Jian; Verstak, Alex; Watson, Layne T.; Stinson, C.A.; Ramakrishnan, Naren; Shaffer, Clifford A.; Rappaport, Theodore S.; Anderson, Christopher R.; Bae, Kyung; Jiang, Jing; Tranter, William H. (Department of Computer Science, Virginia Polytechnic Institute & State University, 2002-07-01), TR-02-16
      In this paper, a global optimization technique is applied to solve the optimal transmitter placement problem for indoor wireless systems. An efficient pattern search algorithm -- DIRECT (DIviding RECTangles) of Jones,Perttunen, ...
    • A Sampling Filter for Non-Gaussian Data Assimilation 

      Attia, A; Sandu, A
      Data assimilation combines information from models, measurements, and priors to estimate the state of a dynamical system such as the atmosphere. The Ensemble Kalman filter (EnKF) is a family of ensemble-based data assimilation ...
    • Sapphire Fibers: Optical Attenuation And Splicing Techniques 

      Barnes, A. E.; May, R. G.; Sreenivasulu, Gollapudi; Claus, Richard O. (Optical Society of America, 1995-12-01)
      The optical attenuation in sapphire fibers was examined. Attenuation was found to depend heavily on injection conditions. A number of techniques for making sapphire-silica fiber splices were attempted, with an effort toward ...
    • SART-Type Image Reconstruction from a Limited Number of Projections with the Sparsity Constraint 

      Yu, Hengyong; Wang, Ge (Hindawi, 2010-04-26)
      Based on the recent mathematical findings on solving the linear inverse problems with sparsity constraints by Daubechiesx et al., here we adapt a simultaneous algebraic reconstruction technique (SART) for image reconstruction ...
    • SART-Type Image Reconstruction from Overlapped Projections 

      Yu, Hengyong; Ji, Changguo; Wang, Ge (Hindawi, 2010-09-05)
      To maximize the time-integrated X-ray flux from multiple X-ray sources and shorten the data acquisition process, a promising way is to allow overlapped projections from multiple sources being simultaneously on without ...
    • Satellite Formation Flight Simulation Using Multi-Constellation GNSS and Applications to Ionospheric Remote Sensing 

      Peng, YuXiang; Scales, Wayne A. (MDPI, 2019-11-30)
      The Virginia Tech Formation Flying Testbed (VTFFTB) is a global navigation satellite system (GNSS)-based hardware-in-the-loop (HIL) simulation testbed for spacecraft formation flying with ionospheric remote sensing ...
    • SBES Advanced Multi-scale CT Facility at Virginia Tech - From Multi-scale to Multi-energy and Multi-Parameter Imaging Capabilities 

      Wang, Ge; Wyatt, Chris L.; Yu, Hengyong; Sharma, Kriti S.; Prater, Renee; Xiao, Shuhai; Markert, Chad; Saul, Justin; Fox, Edward A.; Lee, Seung W.; Feser, Michael; Lau, S. H.; Yun, Wenbing; Wang, Steve (2010-04-05)
      While clinical CT scanners are available at our medical school, for preclinical imaging we have a Scanco micro-CT scanner, an Xradia micro-CT scanner and an Xradia nano-CT scanner. With all these scanners, we can cover ...
    • SBES News, Fall 2009 

      Unknown author (Virginia Tech, 2009)
      This is the annual newsletter for the School of Biomedical Engineering and Sciences. In this issue: Our New Buildings Come to Life.
    • SBES News, Fall 2010 

      Unknown author (Virginia Tech, 2010)
      This is the annual newsletter for the School of Biomedical Engineering and Sciences. In this issue: New Medical School, New Research Institute, New Partnerships.
    • SBES News, Fall 2011 

      Unknown author (Virginia Tech, 2011)
      This is the annual newsletter for the School of Biomedical Engineering and Sciences. In this issue: 17 New Faculty Join SBES.
    • SBES News, Fall 2012 

      Unknown author (Virginia Tech, 2012)
      This is the annual newsletter for the School of Biomedical Engineering and Sciences. In this issue: Doubled our Faculty.
    • SBES News, Fall 2013 

      Unknown author (Virginia Tech, 2013)
      This is the annual newsletter for the School of Biomedical Engineering and Sciences. In this issue: Crusade Against Cancer.
    • SBES News, Summer/Fall 2008 

      Unknown author (Virginia Tech, 2008)
      This is the annual newsletter for the School of Biomedical Engineering and Sciences.
    • Scalability Analysis of Parallel GMRES Implementations 

      Sosonkina, Masha; Allison, Donald C. S.; Watson, Layne T. (Department of Computer Science, Virginia Polytechnic Institute & State University, 2001), TR-01-06
      Applications involving large sparse nonsymmetric linear systems encourage parallel implementations of robust iterative solution methods, such as GMRES(k). Two parallel versions of GMRES(k) based on different data distributions ...
    • Scalable Fabrication of Highly Flexible Porous Polymer-Based Capacitive Humidity Sensor Using Convergence Fiber Drawing 

      Tousi, Maryam Mesgarpour; Zhang, Yujing; Wan, Shaowei; Yu, Li; Hou, Chong; Yan, Ning; Fink, Yoel; Wang, Anbo; Jia, Xiaoting (MDPI, 2019-12-02)
      In this study, we fabricated a highly flexible fiber-based capacitive humidity sensor using a scalable convergence fiber drawing approach. The sensor’s sensing layer is made of porous polyetherimide (PEI) with its ...
    • Scalable Storage for Digital Libraries 

      Mather, Paul (Department of Computer Science, Virginia Polytechnic Institute & State University, 2002-10-01), TR-02-21
      I propose a storage system optimised for digital libraries. Its key features are its heterogeneous scalability; its integration and exploitation of rich semantic metadata associated with digital objects; its use of a name ...
    • Scaling Law for Photon Transmission through Optically Turbid Slabs Based on Random Walk Theory 

      Li, Xuesong; Ma, Lin (MDPI, 2012-03-01)
      Past work has demonstrated the value of a random walk theory (RWT) to solve multiple-scattering problems arising in numerous contexts. This paper's goal is to investigate the application range of the RWT using Monte Carlo ...
    • Scaling Secure Computation 

      Evans, David (2013-04-25)
      Alice and Bob meet in a campus bar in 2017. Being typical Virginia Tech students, they both have their genomes stored on their mobile devices and, before expending any unnecessary effort in courtship rituals, they want to ...
    • Scaling the World-Wide Web 

      Abdulla, Ghaleb; Abrams, Marc; Fox, Edward A. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1996-03-01), TR-96-06
    • ScALPEL: A Scalable Adaptive Lightweight Performance Evaluation Library for application performance monitoring 

      Pyla, Hari; Ramesh, Bharath; Ribbens, Calvin J.; Varadarajan, Srinidhi (Department of Computer Science, Virginia Polytechnic Institute & State University, 2009-02-01), TR-09-03
      As supercomputers continue to grow in scale and capabilities, it is becoming increasingly difficult to isolate processor and system level causes of performance degradation. Over the last several years, a significant number ...