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Articles 9481 - 9510 of 12097
Full-Text Articles in Entire DC Network
Hot In-Place Recycling Of Asphalt Pavement, Michael T. Vietti
Hot In-Place Recycling Of Asphalt Pavement, Michael T. Vietti
Purdue Road School
No abstract provided.
Active Defense Of A Computer System Using Autonomous Agents, Mark Crosbie, Eugene H. Spafford
Active Defense Of A Computer System Using Autonomous Agents, Mark Crosbie, Eugene H. Spafford
Department of Computer Science Technical Reports
No abstract provided.
Adapting Distributed Database Systems For High Availability, Xiangning Liu, Evaggelia Pitoura, Bharat Bhargava
Adapting Distributed Database Systems For High Availability, Xiangning Liu, Evaggelia Pitoura, Bharat Bhargava
Department of Computer Science Technical Reports
No abstract provided.
Concurrent And Fail-Safe Replicated Simulations On Heterogeneous Networks: An Introduction To Eclipse, Felipe Knop, Edward Mascarenhas, Vernon J. Rego, V. S. Sunderam
Concurrent And Fail-Safe Replicated Simulations On Heterogeneous Networks: An Introduction To Eclipse, Felipe Knop, Edward Mascarenhas, Vernon J. Rego, V. S. Sunderam
Department of Computer Science Technical Reports
No abstract provided.
Consistent And Recoverable Agent-Based Access To Heterogeneous Mobile Databases, Evaggelia Pitoura, Bharat Bhargava
Consistent And Recoverable Agent-Based Access To Heterogeneous Mobile Databases, Evaggelia Pitoura, Bharat Bhargava
Department of Computer Science Technical Reports
No abstract provided.
An Efficient Lower Bound Algorithm For Channel Routing, Heng Yi Chao, Mary P. Harper
An Efficient Lower Bound Algorithm For Channel Routing, Heng Yi Chao, Mary P. Harper
Department of Electrical and Computer Engineering Technical Reports
Channel routing plays a central role in the physical design of VLSI chips. For two-layer dogleg-free channel routing, dm,, and v,,, are the two traditional lower bounds. In this paper, we present two efficient algorithms for computing a tighter lower bound for the channel routing problem. Our algorithms succe:j~fullyc ompute a lower bound of 26 for Deutsch's Difficult Example (DDE). The experiment on some large-scale randomly generated channel routing problems sholws that our lower bound algorithms are much tighter than the traditional lower bounds, and are much more efficient than Pals' algorithm [20] while obtaining similar (sometimes better) results.
Rethinking The Wac/Writing Center Connection, Michael A. Pemberton
Rethinking The Wac/Writing Center Connection, Michael A. Pemberton
The Writing Center Journal
No abstract provided.
From The Editor, Dave Healy
Sovereignty Conditions And Governance Modes: An Option Theory Approach, John A. Carlson
Sovereignty Conditions And Governance Modes: An Option Theory Approach, John A. Carlson
Purdue CIBER Working Papers
This study extends previous work which has examined governance decisions using option theory. In particular, it evaluates the contribution of option theory in both domestic and international environments. Empirical results from a multinomial logit model suggest that the influence of option value differs across segments.
Money Growth Variability And The Term Structure Of Interest In Japan, Gerald J. Lynch, Bradley T. Ewing
Money Growth Variability And The Term Structure Of Interest In Japan, Gerald J. Lynch, Bradley T. Ewing
Purdue CIBER Working Papers
The hypothesis of this paper is that uncertain moeny growth leads to an increased yield spread between short term and long term interest rates. Since current inflation is obviously the same at any given time, the change in the term structure can be explained, in part, by the greater degree of uncertainty in the long term caused by monetary uncertainty. This hypothesis is tested by looking at the spread between short term and long term instruments in Japan and determining if increased monetary instability leads to a wider yield spread. We find that a rise in monetary uncertainty is associated …
Impact Of Data-Reuse And Multiple Data-Copies In A Heterogeneous Computing System With Sequentially Executed Subtasks , Min Tan, John K. Antonio, Howard Jay Siegel, Yan Alexander Li
Impact Of Data-Reuse And Multiple Data-Copies In A Heterogeneous Computing System With Sequentially Executed Subtasks , Min Tan, John K. Antonio, Howard Jay Siegel, Yan Alexander Li
Department of Electrical and Computer Engineering Technical Reports
In a heterogeneous computing (HC) environment, an application program is decomposed into subtasks, then each computationally homogeneous subtask is assigned to the machine where it is best suited for execution. It is assumed that, at any instant in time during the execution of a specific application program, only one machine is being used for program execution and only one subtask is being executed. A mathematical model is presented for three of the factors that affect the execution time of an application program in an HC system: matching, scheduling, and data relocation schemes. Two data relocation situations are identified, namely data-reuse …
On The Carrier Mobility In Forward-Biased Semiconductor Barriers, Mark S. Lundstrom, Shin'ichi Tanaka
On The Carrier Mobility In Forward-Biased Semiconductor Barriers, Mark S. Lundstrom, Shin'ichi Tanaka
Department of Electrical and Computer Engineering Faculty Publications
A simple one-speed solution to the Boltzmann equation is used to evaluate the mobility and diffusion coefficient for carriers in forward-biased semiconductor barriers. The analysis shows that although the average kinetic energy of carriers remains near thermal equilibrium, the mobility and diffusion coefficient are strongly reduced by the built-in field. Conventional macroscopic transport equations, which treat the carrier mobility and diffusion coefficient as single valued functions of the kinetic energy will improperly treat transport in forward-biased barriers. The results are important for the careful analysis of metal–semiconductor and heterojunction diodes.
On The Carrier Mobility In Forward-Biased Semiconductor Barriers, Mark S. Lundstrom, S. I. Tanaka
On The Carrier Mobility In Forward-Biased Semiconductor Barriers, Mark S. Lundstrom, S. I. Tanaka
Department of Electrical and Computer Engineering Faculty Publications
A simple one-speed solution to the Boltzmann equation is used to evaluate the mobility and diffusion coefficient for carriers in forward-biased semiconductor barriers. The analysis shows that although the average kinetic energy of carriers remains near thermal equilibrium, the mobility and diffusion coefficient are strongly reduced by the built-in field. Conventional macroscopic transport equations, which treat the carrier mobility and diffusion coefficient as single valued functions of the kinetic energy will improperly treat transport in forward-biased barriers. The results are important for the careful analysis of metal-semiconductor and heterojunction diodes.© 1995 American Institute of Physics.
Transition Matrix Approach For Monte Carlo Simulation Of Coupled Electron/Phonon/Photon Dynamics, Muhammad A. Alam, Mark S. Lundstrom
Transition Matrix Approach For Monte Carlo Simulation Of Coupled Electron/Phonon/Photon Dynamics, Muhammad A. Alam, Mark S. Lundstrom
Department of Electrical and Computer Engineering Faculty Publications
A new approach for simulating the dynamics of electrons, phonons, and photons is described. The technique provides a Monte Carlo simulation of particle dynamics without the statistical noise associated with direct Monte Carlo simulation, treats physical phenomena with a wide range of time scales, and has a good computational efficiency. A transition matrix is first precomputed by direct Monte Carlo simulation. Particle populations are then updated at regular time steps by simple matrix multiplication while correcting for nonlinear effects such as carrier–carrier scattering, band filling, hot phonons, etc. The technique is well suited to studies of quantum well laser devices …
Temperature Dependence Of Minority And Majority Carrier Mobilities In Degenerately Doped Gaas, Michael L. Lovejoy, Michael R. Melloch, Mark S. Lundstrom
Temperature Dependence Of Minority And Majority Carrier Mobilities In Degenerately Doped Gaas, Michael L. Lovejoy, Michael R. Melloch, Mark S. Lundstrom
Department of Electrical and Computer Engineering Faculty Publications
Measured minority and majority carrier mobility temperature dependencies in heavily doped n- and p-GaAs are compared. Majority carrier mobilities in heavily doped GaAs are essentially temperature ~T! independent while minority carrier mobilities exhibit a roughly 1/T dependence. Majority carrier freezeout, which reduces both majority–minority carrier and ionized impurity scattering, is shown not to be responsible for the 1/T minority carrier mobility dependence. The difference in minority and majority carrier mobility T dependencies is explained in terms of the increased degree of degeneracy of majority carriers with decreased temperature, which decreases majority–minority carrier scattering.
Characterization Of Photon Recycling In Thin Crystalline Gaas Light Emitting Diodes, M. P. Patkar, M. S. Lundstrom, Michael R. Melloch
Characterization Of Photon Recycling In Thin Crystalline Gaas Light Emitting Diodes, M. P. Patkar, M. S. Lundstrom, Michael R. Melloch
Department of Electrical and Computer Engineering Faculty Publications
Gallium arsenide light emitting diodes (LEDs) were fabricated using molecular beam epitaxial films on GaAs substrates and removed by epitaxial lift-off (ELO). Lifted off devices were then mounted on a Si wafer using a Pd/Au/Cr contact layer, which also served as a back surface reflector. Devices were characterized by electrical and optical measurements, and the results for devices on the GaAs substrate were compared to those for EL0 devices. EL0 LEDs coated with a ZnS/MgF2 antireflection coating exhibited an optical output that was up to six times that of LEDs on GaAs substrates. At the same time, the measured current-voltage …
Reliable Stream Transmission In Mobile Computing Environments, Houzhi Xu, Bharat Bhargava
Reliable Stream Transmission In Mobile Computing Environments, Houzhi Xu, Bharat Bhargava
Department of Computer Science Technical Reports
No abstract provided.
Early Writing Centers: Toward A History, Peter Carino
Early Writing Centers: Toward A History, Peter Carino
The Writing Center Journal
No abstract provided.
A Decision Support System For Real-Time Snow And Ice Control, Hjalmar James Miedema, J. R. Wright
A Decision Support System For Real-Time Snow And Ice Control, Hjalmar James Miedema, J. R. Wright
JTRP Technical Reports
Effective real-time snow and ice control operations require a timely initial call-out. A timely initial call-out is one that mobilizes the workforce slightly prior to the onset of hazardous road conditions. In order to estimate the onset of hazardous road conditions, the snow and ice control decision makers use available physical and meteorological information. New technologies are developed that could provide better information, thereby improving the ability to make timely initial call-outs. A systematic methodology for evaluating the benefit of additional information used in snow and ice control initiation is presented. The purposed methodology compares reduction in the direct and …
Asphalt Mix Design And Performance, Shakor Ramat Badaruddin, Thomas D. White
Asphalt Mix Design And Performance, Shakor Ramat Badaruddin, Thomas D. White
JTRP Technical Reports
Premature flexible pavement distress became a major concern in Indiana. As a result, a study was conducted investigating the major underlying factors. Pavement sections were investigated based on a factorial study with four factors comprised of climate, truck traffic, pavement base type, and wheel path. The distresses evaluated were rutting, thermal cracking and stripping. All were evaluated against control sections with zero distress. The pavement condition of each section was determined. Laboratory tests of field sample included physical properties, dynamic creep and recompaction. Results of the study indicate that the Asphalt Institute mix design criteria identify an asphalt content that …
Inter-Activism: Strengthening The Writing Conference, Darsie Bowden
Inter-Activism: Strengthening The Writing Conference, Darsie Bowden
The Writing Center Journal
No abstract provided.
Migrant Rationalities: Graduate Students And The Idea Of Authority In The Writing Center, Nancy Welch
Migrant Rationalities: Graduate Students And The Idea Of Authority In The Writing Center, Nancy Welch
The Writing Center Journal
No abstract provided.
Finding Consistency And Speculating Change: What We Can Learn About Portfolio Assessment From The Writing Center, Sheryl I. Fontaine
Finding Consistency And Speculating Change: What We Can Learn About Portfolio Assessment From The Writing Center, Sheryl I. Fontaine
The Writing Center Journal
No abstract provided.
Development Of Annual Permit Procedure For Overweight Trucks On Indiana Highways, Robert K. Whitford, David P. Moffett
Development Of Annual Permit Procedure For Overweight Trucks On Indiana Highways, Robert K. Whitford, David P. Moffett
JTRP Technical Reports
Overweight truck permitting in Indiana is presently done on a per trip basis. This study evaluated alternatives to each trip having to make a call to the INDOT permit office to gain a permit. The study was originally requested by the Indiana State Legislature under P.L. 122-1993 section 7 in response to delays in getting permits. The report’s six chapters are 1. Introduction and Summary 2. Review of Other States’ Permitting Systems 3. Framework for Policy Evaluation 4. Permits for Michigan Truck-Trains 5. Overweight and Overweight/Oversized Trucks 6. Implementation Suggestions – PLUS -- 7. Appendices. A Michigan Truck-Train is a …
Effects Of Salt And Trace Minerals For Bituminous Pavement Literature Review, Information Gathering, And Research Plan Development, Robert Allan Pittenger, Terry R. West
Effects Of Salt And Trace Minerals For Bituminous Pavement Literature Review, Information Gathering, And Research Plan Development, Robert Allan Pittenger, Terry R. West
JTRP Technical Reports
A review of current literature on the effects of deicing salt and trace minerals, such as sulfate, on aggregate deterioration was conducted. Such deterioration in both Portland cement concrete, and bituminous pavements was reviewed. For Portland cement concrete, it was determined that current research on the effects of moisture and deicing salt on aggregates concrete matrix durability, with little discussion on the effects on aggregates. The effects of trace minerals in deicing salt are also rarely discussed. Pore size distribution, insoluble residue, absorption, and susceptibility to alkali-silica reaction all appear to affect aggregate durability in the presence of moisture of …
Fatigue Strength Of Girders With Tapered Covered Plates, Ahmed Farouk Hassan, Mark D. Bowman
Fatigue Strength Of Girders With Tapered Covered Plates, Ahmed Farouk Hassan, Mark D. Bowman
JTRP Technical Reports
This report represents results from a study to determine the fatigue strength of steel beams with welded partial-length cover plates. Results of an experimental investigation that examined the fatigue strength of various cracked cover plate end details that were subsequently repaired are presented. The repair methods investigated included a slip-critical bolted splice plate connection, air-hammer peening, and a combination of the previous two called a partial bolted splice connection. Also, an analytical model was developed to predict the fatigue behavior of a cover plate and detail that is repaired using one of the three repair methods investigated and which contains …
Predicting Traffic Impacts At Two-Lane Highway Work Zones, Michael J. Cassidy, Youngtae Son
Predicting Traffic Impacts At Two-Lane Highway Work Zones, Michael J. Cassidy, Youngtae Son
JTRP Technical Reports
Maintenance or reconstruction activity on a two-lane highway often requires a lane closure. The implementation of “one-way traffic control,” required to maintain traffic flow throughout the work zone, typically produces significant motorist delay. This report describes the adaptation and application of queuing models, originally derived for intersections controlled by vehicle-actuated traffic signals, to estimate delay at two-lane highway work zones. The models estimate expected delay as a function of directional traffic demand rates, work zone physical length and observed traffic measures. Validation efforts using simulation suggest that the models accurately predict the impacts of two-lane highway lane closures.
Use Of Time Domain Reflectometry For Determination Of Water Content An Density Of Soil, Shafiqul I. Siddiqui, Vincent P. Drnevich
Use Of Time Domain Reflectometry For Determination Of Water Content An Density Of Soil, Shafiqul I. Siddiqui, Vincent P. Drnevich
JTRP Technical Reports
A new method is developed for measuring in-place density and moisture content of soil using the technique of Time Domain Reflectometry (TDR). The method is applicable for construction control of earthworks. The method is extended for measuring moisture content of soil in the laboratory and in the field for various other geotechnical purposes. Laboratory uses include measuring moisture content of soil in compaction molds; field uses include measuring moisture content of soil in Shelby tubes and soil retrieved during drilling and sampling operations. In the course of achieving these goals, this study develops the principles of TDR probe design, test …
Recognition And Localization Of A Flat Symmetric Object From A Single Perspective Image, Andoo P. Yang, David M. Chelberg
Recognition And Localization Of A Flat Symmetric Object From A Single Perspective Image, Andoo P. Yang, David M. Chelberg
Department of Electrical and Computer Engineering Technical Reports
A flat symmetric object viewed under perspective (orthographic) projectiorl yields a convergent (skew) symmetry. Unlike skew symmetry where the axes constrain the orientation of the underlying object to lie on a hyperbola in the gradient space, for convergent symmetry the object orientation can be uniquely determined from the axis and convergent point except for some special cases. However, detection of the axis and convergent point of a convergent symmetry has not yet received much attention. We present a technique which can detect the axis and convergent point of a convergent symmetric contmour in an image using distinguished points such as …