Browsing College of Engineering (COE) by Title

Now showing items 2357-2376 of 3624

    • An O(n log n) Algorithm for Finding Minimal Perfect Hash Functions 

      Fox, Edward A.; Heath, Lenwood S.; Chen, Qi-Fan (Department of Computer Science, Virginia Polytechnic Institute & State University, 1989), TR-89-10
      We describe the first practical algorithm for finding minimal perfect hash functions that can be used to access very large databases. This method extends earlier work wherein an O(n3) algorithm was devised, building upon ...

    • An O(N log N) Expected Time Merge Heuristic for the Planar ETSP 

      Chadha, Ritu; Allison, Donald C. S. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1988), TR-88-16
      We discuss a new heuristic for solving the Euclidean Traveling Salesman Problem (ETSP). This heuristic is a convex hull-based method and makes use of the Delaunay triangulation of the set of cities to compute a tour for ...

    • OAI and ODL: Building Digital Libraries from Components 

      Richardson, Ryan (2003-09-18)
      This presentation describes the Open Archives Initiative (OAI), OAI-PMH, and the Open Digital Library (ODL).

    • OAI and ODL: Building Digital Libraries from Components 

      Suleman, Hussein (2002-09-12)
      This presentation instructs users how to build digital libraries from components, which is the fundamental concept behind DLbox. It was written for graduate computer science classes at Virginia Tech and fits into a 50-minute ...

    • An OAI-based Digital Library Framework for Biodiversity Information Systems 

      Torres, Ricardo da Silva; Medeiros, Claudia; Goncalves, Marcos A.; Fox, Edward A. (Department of Computer Science, Virginia Polytechnic Institute & State University, 2004), TR-04-01a
      Biodiversity information systems (BISs) involve all kinds of heterogeneous data, which include ecological and geographical features. However, available information systems offer very limited support for managing such data ...

    • OAI/ODL Component Composition Exercise 

      Suleman, Hussein (2002-09-01)
      This exercise is a hands-on introduction to building digital libraries from components. It is a good introduction for individuals with modest Unix skills, and it reviews the process of using DLbox to create a working digital ...

    • Object Oriented Metrics: Generation and Application 

      Lattanzi, Mark; Henry, Sallie M. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1994-05-01), TR-94-20
      Object oriented software has been cited by many [Cox86, Meye87, Coad90, Booc91] as a cure to some of the common problems occurring in software development. In particular, the object oriented paradigm, through inheritance, ...

    • An Object-oriented Approach to Semidefinite Programming 

      Yuzhen, Ge; Watson, Layne T.; Emmanuel G. Collins, Jr. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1996-05-01), TR-96-08
      An object-oriented design and implementation of a primal-dual algorithm for solving the semidefinite programming problem is presented. The advantages of applying the object-oriented methodology to numerical computations, ...

    • Object-Oriented Metrics Which Predict Maintainability 

      Li, Wei; Henry, Sallie M. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1993), TR-93-05
      Software metrics have been studied in the procedural paradigm as a quantitative means of assessing the software development process as well as the quality of software products. Several studies have validated that various ...

    • Objective and Comprehensive Evaluation of Bisulfite Short Read Mapping Tools 

      Tran, Hong; Porter, Jacob; Sun, Ming-an; Xie, Hehuang; Zhang, Liqing (Hindawi, 2014-04-15)
      Background. Large-scale bisulfite treatment and short reads sequencing technology allow comprehensive estimation of methylation states of Cs in the genomes of different tissues, cell types, and developmental stages. Accurate ...

    • The Objectives And Requirements of Model Manageement 

      Nance, Richard E.; Balci, Osman (Department of Computer Science, Virginia Polytechnic Institute & State University, 1983), CS83024-R
      Model management is a technology evolving by necessity, pushed by the attempts to deal with increasingly complex systems and the perceived inadequacies of past efforts. This rapid evolution of Model Management Systems ...

    • Observation of domain texture in poled Pb(Mg1/3Nb2/3)O-3-PbTiO3 crystals 

      Li, Jiefang; Ruette, B.; Viehland, Dwight D. (AIP Publishing, 2002-11-01)
      Mapping of domain distributions under constant Bragg conditions has been performed on poled (0.7)Pb(Mg1/3Nb2/3)O-3-0.3PbTiO(3) crystals. Studies were done on crystals of cubic geometry, where each cube face was oriented ...

    • Observation of partially incoherent <110> boundaries between polar nanodomains in Na1/2Bi1/2TiO3 single crystals 

      Yao, Jianjun; Ge, Wenwei; Yang, Yaodong; Luo, Liang; Li, Jiefang; Viehland, Dwight D.; Bhattacharyya, Somnath; Zhang, Qinhui; Luo, Haosu (American Institute of Physics, 2010-09-15)
      The ferroelectric domain structure of Na1/2Bi1/2TiO3 single crystals was investigated by transmission electron microscopy (TEM) and piezoforce microscopy (PFM). Bright-field TEM and PFM images revealed the presence of polar ...

    • Observation of Quantized and Partial Quantized Conductance in Polymer- Suspended Graphene Nanoplatelets 

      Kang, Yuhong; Ruan, Hang; Claus, Richard O.; Heremans, Jean; Orlowski, Marius (SpringerOpen, 2016)
      Quantized conductance is observed at zero magnetic field and room temperature in metal-insulator-metal structures with graphene submicron-sized nanoplatelets embedded in a 3-hexylthiophene (P3HT) polymer layer. In devices ...

    • Observation Of The Enhanced Backscattering Of Light By The End Of A Tilted Dielectric Cylinder Owing To The Caustic Merging Transition 

      Marston, P. L.; Zhang, Y. B.; Thiessen, D. B. (Optical Society of America, 2003-03-01)
      The scattering of light by obliquely illuminated circular dielectric cylinders was previously demonstrated to be enhanced by a merger of Airy caustics at a critical tilt angle. [Appl. Opt. 37, 1534 (1998)]. A related ...

    • Observations of crab giant pulses in 20-84 MHz using LWA1 

      Ellingson, S. W.; Clarke, Tracy E.; Craig, J.; Hicks, B. C.; Lazio, T. J. W.; Taylor, G. B.; Wilson, T. L.; Wolfe, C. N. (IOP Publishing Ltd., 2013-05-01)
      We report the detection and observed characteristics of giant pulses from the Crab Nebula pulsar (B0531+21) in four frequency bands covering 20-84 MHz using the recently completed Long Wavelength Array Station 1 (LWA1) ...

    • Observations of Reduced Turbulence and Wave Activity in the Arctic Middle Atmosphere Following the January 2015 Sudden Stratospheric Warming 

      Triplett, Colin C.; Li, Jintai; Collins, Richard L.; Lehmacher, Gerald A.; Barjatya, Aroh; Fritts, David C.; Strelnikov, Boris; Luebken, Franz-Josef; Thurairajah, Brentha; Harvey, V. Lynn; Hampton, Donald L.; Varney, Roger H. (2018-12-16)
      Measurements of turbulence and waves were made as part of the Mesosphere-Lower Thermosphere Turbulence Experiment (MTeX) on the night of 25-26 January 2015 at Poker Flat Research Range, Chatanika, Alaska (65 degrees N, 147 ...

    • Obtaining reliable transient rheological data on concentrated short fiber suspensions using a rotational rheometer 

      Eberle, A. P. R.; Baird, Donald G.; Wapperom, P.; Velez-Garcia, G. M. (AIP Publishing, 2009-09-01)
      The conventional method for obtaining transient rheological data on short glass fiber-filled polymeric fluids is to use the parallel disk (PP) geometry in a rotational rheometer. Using the PP geometry large transient stress ...

    • Occupational Safety and Health Concerns in Logging: A Cross-Sectional Assessment in Virginia 

      Kim, Sunwook; Nussbaum, Maury A.; Schoenfisch, Ashley L.; Barrett, Scott M.; Bolding, Michael Chad; Dickerson, Deborah E. (MDPI, 2017-11-15)
      Increased logging mechanization has helped improve logging safety and health, yet related safety risks and concerns are not well understood. A cross-sectional study was completed among Virginia loggers. Participants (n ...

    • Octant analysis based structural relations for three-dimensional turbulent boundary layers 

      Olcmen, S. M.; Simpson, R. L.; Newby, J. W. (American Institute of Physics, 2006-02-01)
      A flow structure based triple-product correlation model developed by Nagano and Tagawa [J. Fluid Mech. 215, 639 (1990)] has been expanded to three-dimensional turbulent flows. Three-dimensional turbulent boundary layer ...