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Articles 25831 - 25860 of 27737
Full-Text Articles in Entire DC Network
The Dark Side Of Risk (What Your Mother Never Told You About Time Warp), David M. Nicol, Xiaowen Liu
The Dark Side Of Risk (What Your Mother Never Told You About Time Warp), David M. Nicol, Xiaowen Liu
Computer Science Technical Reports
This paper is a reminder of the danger of allowing ``risk'' when synchronizing a parallel discrete-event simulation: a simulation code that runs correctly on a serial machine may, when run in parallel, fail catastrophically. This can happen when Time Warp presents an ``inconsistent'' message to an LP, a message that makes absolutely no sense given the LP's state. Failure may result if the simulation modeler did not anticipate the possibility of this inconsistency. While the problem is not new, there has been little discussion of how to deal with it; furthermore the problem may not be evident to new users …
A Critique Of The Telecommunications Description Language (Ted), Brian J. Premore, David M. Nicol, Xiaowen Liu
A Critique Of The Telecommunications Description Language (Ted), Brian J. Premore, David M. Nicol, Xiaowen Liu
Computer Science Technical Reports
TeD is an object-oriented description language designed to facilitate the modeling of large scale telecommunication networks, with simulation on parallel and distributed platforms. TeD models are mapped to the Georgia Tech Time Warp engine (GTW) for execution. In this paper we outline the features of TeD, pointing out its strengths and identifying characteristics that gave us trouble as we used TeD to model detailed networks. Our issues are motivated specifically by a model of TCP and a model of multicast resource allocation. Our intention is to illustrate by example what TeD can do, and characteristics that a potential TeD user …
High Quality Alias Free Image Rotation, Charles B. Owen, Fillia Makedon
High Quality Alias Free Image Rotation, Charles B. Owen, Fillia Makedon
Dartmouth Scholarship
This paper presents new algorithms for the rotation of images. The primary design criteria for these algorithms is very high quality. Common methods for image rotation, including convolutional and separable approaches, are examined and shown to exhibit significant high frequency aliasing problems. A new resampling filter design methodology is presented which minimizes the problem for conventional convolution-based image rotation. The paper also presents a new separable image rotation algorithm which exhibits improved performance in term of reduction in artifacts and an efficient $O(N^{2} log N)$ running time.
Quality Of Service Test By Codec Performance, Shunge Li, Bharat Bhargava, Dawei Wang
Quality Of Service Test By Codec Performance, Shunge Li, Bharat Bhargava, Dawei Wang
Department of Computer Science Technical Reports
No abstract provided.
Agent Based Network Systems For Multi- Physics Problems, Tzvetan Drashansky, John R. Rice
Agent Based Network Systems For Multi- Physics Problems, Tzvetan Drashansky, John R. Rice
Department of Computer Science Technical Reports
No abstract provided.
Annotated Statistical Indices For Sequence Analysis, Alberto Apostolico, Mary Ellen Bock, Xuyan Xu
Annotated Statistical Indices For Sequence Analysis, Alberto Apostolico, Mary Ellen Bock, Xuyan Xu
Department of Computer Science Technical Reports
No abstract provided.
Parallel (//) Ellpack: A Problem Solving Environment For Pde Based Applications On Multicomputer Platforms, Elias N. Houstis, John R. Rice, S. Weerawarana, A. C. Catlin, P. Papachiou, M. Gaitatzes
Parallel (//) Ellpack: A Problem Solving Environment For Pde Based Applications On Multicomputer Platforms, Elias N. Houstis, John R. Rice, S. Weerawarana, A. C. Catlin, P. Papachiou, M. Gaitatzes
Department of Computer Science Technical Reports
No abstract provided.
Galley: A New Parallel File System For Parallel Applications, Nils Nieuwejaar
Galley: A New Parallel File System For Parallel Applications, Nils Nieuwejaar
Dartmouth College Ph.D Dissertations
Most current multiprocessor file systems are designed to use multiple disks in parallel, using the high aggregate bandwidth to meet the growing I/O requirements of parallel scientific applications. Most multiprocessor file systems provide applications with a conventional Unix-like interface, allowing the application to access those multiple disks transparently. This interface conceals the parallelism within the file system, increasing the ease of programmability, but making it difficult or impossible for sophisticated application and library programmers to use knowledge about their I/O to exploit that parallelism. In addition to providing an insufficient interface, most current multiprocessor file systems are optimized for a …
Four-Fermion Production In E+E- Collisions At Centre-Of-Mass Energies Of 130 And 136 Gev, D. Buskulic, Manoj Thulasidas
Four-Fermion Production In E+E- Collisions At Centre-Of-Mass Energies Of 130 And 136 Gev, D. Buskulic, Manoj Thulasidas
Research Collection School Of Computing and Information Systems
Four-fermion events have been selected in a data sample of 5.8 pb−1 collected with the aleph detector at centre-of-mass energies of 130 and 136 GeV. The final states ℓ+ℓ−qq, ℓ+ℓ−ℓ+ℓ−, ννqq, and ννℓ+ℓ− have been examined. Five events are observed in the data, in agreement with the Standard Model predictions of 6.67±0.38 events from four-fermion processes and 0.14−0.05+0.19 from background processes.
Applications Of Parallel I/O, David Kotz
Applications Of Parallel I/O, David Kotz
Computer Science Technical Reports
Scientific applications are increasingly being implemented on massively parallel supercomputers. Many of these applications have intense I/O demands, as well as massive computational requirements. This paper is essentially an annotated bibliography of papers and other sources of information about scientific applications using parallel I/O. It will be updated periodically.
A Fast Parallel Implementation Of The Wavelet Packet Best Basis Algorithm On The Mp-2 For Real-Time Mri, Sumit Chawla, Dennis M. Healy Jr
A Fast Parallel Implementation Of The Wavelet Packet Best Basis Algorithm On The Mp-2 For Real-Time Mri, Sumit Chawla, Dennis M. Healy Jr
Computer Science Technical Reports
Adaptive signal representations such as those determined by best-basis type algorithms have found extensive application in image processing, although their use in real-time applications may be limited by the complexity of the algorithm. In contrast to the wavelet transform which can be computed in O(n) time, the full wavelet packet expansion required for the standard best basis search takes O(n log n) time to compute. In the parallel world, however, both transforms take O(log n) to compute when the number of processors equal the number of data elements, making the wavelet packet expansion attractive to implement. This note describes near …
An Algorithm For Estimating All Matches Between Two Strings, Mikhail J. Atallah, Frédéric Chyzak, Philippe Dumas
An Algorithm For Estimating All Matches Between Two Strings, Mikhail J. Atallah, Frédéric Chyzak, Philippe Dumas
Department of Computer Science Technical Reports
No abstract provided.
Scene Change Detection For Video Database Management Systems-A Survey, Haitao Jiang, Abdelsalam (Sumi) Helal, Ahmed K. Elmagarmid, Anupam Joshi
Scene Change Detection For Video Database Management Systems-A Survey, Haitao Jiang, Abdelsalam (Sumi) Helal, Ahmed K. Elmagarmid, Anupam Joshi
Department of Computer Science Technical Reports
No abstract provided.
Backtracking, Alberto Apostolico, Giuseppe F. Italiano
Backtracking, Alberto Apostolico, Giuseppe F. Italiano
Department of Computer Science Technical Reports
No abstract provided.
A Fertility Channel Model For Post-Correction Of Continuous Speech Recognition, Eric K. Ringger, James F. Allen
A Fertility Channel Model For Post-Correction Of Continuous Speech Recognition, Eric K. Ringger, James F. Allen
Faculty Publications
We have implemented a post-processor called SPEECHPP to correct word-level errors committed by an arbitrary speech recognizer. Applying a noisy-channel model, SPEECHPP uses a Viterbi beam-search that employs language and channel models. Previous work demonstrated that a simple word-for-word channel model was sufficient to yield substantial incieases in word accuracy. This paper demonstrates that some improvements in word accuracy result from augmenting the channel model with an account of word fertility in the channel. This work further demonstrates that a modern continuous speech recognizer can be used in "black-box" fashion for robustly recognizing speech for which the recognizer was not …
An Evidential Reasoning Approach To Attribute Value Conflict Resolution In Database Integration, Ee Peng Lim, Jaideep Srivastava, Shashi Shekhar
An Evidential Reasoning Approach To Attribute Value Conflict Resolution In Database Integration, Ee Peng Lim, Jaideep Srivastava, Shashi Shekhar
Research Collection School Of Computing and Information Systems
Resolving domain incompatibility among independently developed databases often involves uncertain information. DeMichiel [1] showed that uncertain information can be generated by the mapping of conflicting attributes to a common domain, based on some domain knowledge. In this paper, we show that uncertain information can also arise when the database integration process requires information not directly represented in the component databases, but can be obtained through some summary of data. We therefore propose an extended relational model based on Dempster-Shafer theory of evidence [2] to incorporate such uncertain knowledge about the source databases. The extended relation uses evidence sets to represent …
Authorship Analysis: Identifying The Author Of A Program, Ivan Krsul, Eugene H. Spafford
Authorship Analysis: Identifying The Author Of A Program, Ivan Krsul, Eugene H. Spafford
Department of Computer Science Technical Reports
No abstract provided.
Use Of A Taxonomy Of Security Faults, Taimur Aslam, Ivan Krsul, Eugene H. Spafford
Use Of A Taxonomy Of Security Faults, Taimur Aslam, Ivan Krsul, Eugene H. Spafford
Department of Computer Science Technical Reports
No abstract provided.
Mccogen, A C Code Generator From Mathematica Language, Chang-Hyeon Song
Mccogen, A C Code Generator From Mathematica Language, Chang-Hyeon Song
Department of Computer Science Technical Reports
No abstract provided.
Idiot - Users Guide, Mark Crosbie, Bryn Dole, Todd Ellis, Ivan Krsul, Eugene H. Spafford
Idiot - Users Guide, Mark Crosbie, Bryn Dole, Todd Ellis, Ivan Krsul, Eugene H. Spafford
Department of Computer Science Technical Reports
No abstract provided.
Multi-Pass Transmission Policy: An Effective Method Of Transmitting Large Multimedia Objects In The Wide-Area Network, Sheng-Yih Wang, Bharat Bhargava
Multi-Pass Transmission Policy: An Effective Method Of Transmitting Large Multimedia Objects In The Wide-Area Network, Sheng-Yih Wang, Bharat Bhargava
Department of Computer Science Technical Reports
No abstract provided.
Practical Implementation Of Multiple Model Adaptive Estimation Using Neyman-Pearson Based Hypothesis Testing And Spectral Estimation Tools, Peter D. Hanlon
Practical Implementation Of Multiple Model Adaptive Estimation Using Neyman-Pearson Based Hypothesis Testing And Spectral Estimation Tools, Peter D. Hanlon
Theses and Dissertations
This study investigates and develops various modifications to the Multiple Model Adaptive Estimation (MMAE) algorithm. The standard MMAE uses a bank of Kalman filters, each based on a different model of the system. Each of the filters predict the system response, based on its system model, to a given input and form the residual difference between the prediction and sensor measurements of the system response. Model differences in the input matrix, output matrix, and state transition matrix, which respectively correspond to an actuator failure, sensor failure, and an incorrectly modeled flight condition for a flight control failure application, were investigated …
Development Of A Standard Set Of Indicators And Metrics For Artificial Intelligence (Ai) And Expert System (Es) Software Development Efforts, Derek F. Cossey
Development Of A Standard Set Of Indicators And Metrics For Artificial Intelligence (Ai) And Expert System (Es) Software Development Efforts, Derek F. Cossey
Theses and Dissertations
The purpose of this research was to identify a standard set of indicators and metrics that can be used by program managers to improve their abilities to direct development efforts involving Artificial Intelligence (AI) and Expert Systems (ES). This research addresses two objectives. The first objective is to identify an appropriate set of software indicators and metrics to be used by government program offices for the management of development efforts involving software systems for AI and ES. The second objective is to demonstrate how the resources of the National Software Data and Information Repository (NSDIR) can be used in order …
Physical Modeling For Interaction In Real-Time Simulation, Curtis Lisle
Physical Modeling For Interaction In Real-Time Simulation, Curtis Lisle
Link Foundation Modeling, Simulation and Training Fellowship Reports
The goal of this project was to model objects in a simulated environment with a method which allows physically-correct behavior to be calculated in real-time. Our approach studied the interaction between differing object types and used object-oriented software design to create a class hierarchy of objects suitable for interactive speed virtual environment simulation. We studied physical modeling systems and constraint systems as techniques to control the behavior of objects in our simulations. We also studied two different ways to achieve distributed execution of an object-oriented simulation. In our first approach, we designed a set of simulation software which ran built …
An On-The-Fly Decoding Technique For Reed-Solomon Codes, Yuan Xing Lee, Robert H. Deng, Eng Hean Koh
An On-The-Fly Decoding Technique For Reed-Solomon Codes, Yuan Xing Lee, Robert H. Deng, Eng Hean Koh
Research Collection School Of Computing and Information Systems
An on-the-fly error correction technique for double-byte-error-correction (DBEC) and triple-byte-error-detection (TBED) Reed-Solomon (RS) codes is presented in this paper. This new algorithm finds number of byte-errors (single byte-error, double-byte errors, and triple-byte errors) by simply testing the values of a few syndrome functions, and locates and corrects the byte-errors directly without using the standard iterative algorithms for finding the error location polynomial. More importantly, it neither suffers from malfunctions incurred in Deng-Costello algorithm (1987), nor requires syndrome re-calculation as in Koksal-Yucel's modification (1992). It is also much more simpler and faster than the original Deng-Costello algorithm. It has found applications …
Mass Limit For The Standard Model Higgs Boson With The Full Lep I Aleph Data Sample, Buskulic, D.; Et Al., M. Thulasidas
Mass Limit For The Standard Model Higgs Boson With The Full Lep I Aleph Data Sample, Buskulic, D.; Et Al., M. Thulasidas
Research Collection School Of Computing and Information Systems
The reaction e+e− → HZ∗ is used to search for the standard model Higgs boson in the Hνν and the Hℓ+ℓ− channels. The data sample corresponds to about 4.5 million hadronic Z decays collected by the ALEPH experiment at LEP from 1989 to 1995 at centre-of-mass energies at and around the Z peak. Three candidate events are found in the Hμ+μ− channel, in agreement with the expected background from the electroweak process e+e− ℓ+ℓ−qq. This search results in a 95% C.L. lower limit on the Higgs boson mass of 63.9 GeV/c2.
Measurement Of The B Forward-Backward Asymmetry And Mixing Using High-P⊥ Leptons, Buskulic, D., M. Thulasidas
Measurement Of The B Forward-Backward Asymmetry And Mixing Using High-P⊥ Leptons, Buskulic, D., M. Thulasidas
Research Collection School Of Computing and Information Systems
The B0 - B̄0 average mixing parameter χ and b forward-backward asymmetry AFB0(b) are measured from a sample of about 4 200 000 Z → qq̄ events recorded with the ALEPH detector at LEP in the years 1990–1995. High transverse momentum electrons and muons produced in b semileptonic decays provide the tag of the quark flavour and of its charge.The average mixing parameter and the pole b asymmetry are measured to be χ = 0.1246 ± 0.0051stat ± 0.0052syst, AFB0(b) = 0.1008 ± 0.0043stat ± 0.0028syst. The value of sin2θweff = 0.23198 ± 0.00092 is extracted from the asymmetry measurement.
Observation Of Charmless Hadronic B Decays, Buskulic, D.; Et Al., M. Thulasidas
Observation Of Charmless Hadronic B Decays, Buskulic, D.; Et Al., M. Thulasidas
Research Collection School Of Computing and Information Systems
No abstract provided.
Search For Charginos And Neutralinos With R-Parity Violation At √S = 130 And 136 Gev, Buskulic, D.; Et Al., M. Thulasidas
Search For Charginos And Neutralinos With R-Parity Violation At √S = 130 And 136 Gev, Buskulic, D.; Et Al., M. Thulasidas
Research Collection School Of Computing and Information Systems
Searches for charginos and neutralinos produced in e +e - collisions at centre-of-mass energies of 130 and 136 GeV have been performed under the assumptions that R-parity is not conserved, that the dominant R-parity violating coupling involves only leptonic fields, and that the lifetime of the lightest supersymmetric particle can be neglected. In the 5.7 pb -1 data sample collected by ALEPH, no candidate events were found. As a result, chargino and neutralino masses and couplings are constrained and the domains previously excluded at LEP1 are extended.
Search For Cp Violation In The Decay Z → B B̄ G, Buskulic, D.; Et Al., M. Thulasidas
Search For Cp Violation In The Decay Z → B B̄ G, Buskulic, D.; Et Al., M. Thulasidas
Research Collection School Of Computing and Information Systems
About three million hadronic decays of the Z collected by ALEPH in the years 1991 to 1994 are used to search for anomalous CP violation beyond the Standard Model in the decay Z → bb̄g. The study is performed by analyzing angular correlations between the two quarks and the gluon in three-jet events and by measuring the differential two-jet rate. No signal of CP violation is found. For the combinations of anomalous CP violating couplings, ĥb = ĥAbgVh - ĥVbgAb and hb* = √ĥVb2 + ĥAb2, limits of | ĥb | b*