Digital Commons Network^™

A Load Distribution Through Competition For Workstation Clusters, Kam Hong Shum, Muslim Bozyigit

Research Collection School Of Computing and Information Systems

The aim of this work is to develop a competition driven solution approach for load distribution in distributed computing system (DCS) environments. The subject DCS is composed of a set of workstation clusters. The study deals with concurrent applications, but assumes the existence of the independent tasks executing on individual workstations as well. Akin to conventional load balancing algorithms, the approach considers two phases; the partitioning phase and the mapping phase. Each phase is based on the application and the DCS data which is translated into market data, mainly price. The price is governed by the demand and supply of …

The "Infoharness" Information Integration Platform, Leon Shklar, Satish Thatte, Howard Marcus, Amit P. Sheth

Kno.e.sis Publications

The "InfoHarness" information integration platform, tools, and services being developed at Bellcore are aimed at providing integrated and rapid access to huge amounts of heterogeneous information independent of the type, representation, and location of information. InfoHarness provides advanced search and browsing capabilities without imposing the burden of restructuring, reformatting or relocating information on information suppliers or creators. This is achieved through object-oriented encapsulation of information and the associated meta-information (e.g., type, location, access rights, owner, creation date, etc.). The meta-information extraction methods ensure rapid and largely automatic creation of information repositories. A gateway that supports access to InfoHarness repositories from …

Does Pedagogy Make A Difference?: An Experimental Study Of Unethical Behavior In Information Systems, Deepak Khazanchi

Information Systems and Quantitative Analysis Faculty Publications

Jn the past few years ethics education has received increasing attention from the business and academic communities. Many have instituted pedagogical programs for increasing awareness of ethical issues, ethical norms and codes of conduct in different professions. It appears that both researchers and practitioners are in agreement about the need for providing adequate ethics education to managers (13, 20, 9). This has become especially important in the context of the information systems (IS) discipline. Proliferation of information and communication technologies has raised many questions on what constitutes ethical managerial behavior. Researchers have reported that the existence of a computer-based information …

Asymptotically Optimal Heuristics For Bottleneck And Capacity Optimization Problems, Wojciech Szpankowski

Department of Computer Science Technical Reports

No abstract provided.

Bit-Sequences: A Cache Invalidation Algorithm In Mobile Environments, Jin Jing, Omran Bukhres, Ahmed K. Elmagarmid, Rafael Alonso

Department of Computer Science Technical Reports

No abstract provided.

Geometric Contraints For Cagd, Christoph M. Hoffmann, Jörg Peters

Department of Computer Science Technical Reports

No abstract provided.

Distributed Lock Management For Mobile Transactions, Jin Jing, Omran Bukhres, Ahmed K. Elmagarmid

Department of Computer Science Technical Reports

No abstract provided.

A Suboptimal Lossy Data Compression Based On Approximate Pattern Matching, Tomasz Luczak, Wojciech Szpankowski

Department of Computer Science Technical Reports

No abstract provided.

Representing Nodes And Arcs In 3d Networks, Glenn Franck, Colin Ware

Center for Coastal and Ocean Mapping

This paper introduces six graphical principles for 30 network displays. These are justified with examples from GraphVisualizer3D, a system developed by the authors to investigate the problems of 30 visualization of information networks. GraphVisualizer3D enables the exploration of sulface color, surface texture, object shape, arc shape and labeling conventions.

Biofeedback Gait Training Auditory Vs. Visual Techniques, Timothy D. Hiemenz

Electrical & Computer Engineering Theses & Dissertations

Training lower extremity amputees to walk normally is quite a difficult task. Amputees must wear a prosthesis so they can walk at all. This allows them some mobility, but their walking pattern may be unnatural. If their gait is temporally asymmetric, they need to exert more energy to move about. This research was initiated to help lower extremity amputees to walk more efficiently using biofeedback gait training. Two types of feedback were developed and tested to determine which method gave the most understandable feedback, validating its use in a clinical setting.

A normal gait cycle uses the lower limbs to …

Defining Locally Shared Memory Constructs For Special Purpose Parallel Architectures, David J. Nielsen

Electrical & Computer Engineering Theses & Dissertations

Locally shared memory systems offer significant advantages over other parallel processing systems for specific classes of problems. Locally shared memory systems tend to be easier to program because explicit passing of messages is not necessary. The goal in defining a locally shared memory system is to allow only a small number of processors access to any single memory. If this goal is met, locally shared memory systems provide an architecture which is relatively simple to implement.

To make shared memory architectures attractive to designers of special purpose parallel architectures, the architectures must be scalable. To be scalable, the number of …

A Multiprocessor Extension To The Conventional File System Interface, Nils Nieuwejaar, David Kotz

Computer Science Technical Reports

As the I/O needs of parallel scientific applications increase, file systems for multiprocessors are being designed to provide applications with parallel access to multiple disks. Many parallel file systems present applications with a conventional Unix-like interface that allows the application to access multiple disks transparently. By tracing all the activity of a parallel file system in a production, scientific computing environment, we show that many applications exhibit highly regular, but non-consecutive I/O access patterns. Since the conventional interface does not provide an efficient method of describing these patterns, we present an extension which supports strided and nested-strided I/O requests.

A Domain-Specific Parallel Programming System I: Design And Application To Ecological Modelling, Elaine Wenderholm, Micah Beck

Electrical Engineering and Computer Science - Technical Reports

The goal of the εm project is to make parallel programming easily accessible to a broad community of scientists. Previous approaches such as the use of general parallel programming languages and parallelizing compilers for sequential languages have fallen short in this respect. The approach is to design a special purpose programming language which is oriented towards a specific area of application. The result is a specialized and effective scientific tool. εm is a high-level programming system which puts parallelism into the hands of scientists who are not sophisticated programmers. By restricting and simplifying the programming interface, εm eases both the …

Science Pad: An Intelligent Electronic Notepad For Ubiquitous Scientific Computing, Anupam Joshi, Sanjiva Weerawarana, Tzvetan T. Drashansky, Elias N. Houstis

Department of Computer Science Technical Reports

No abstract provided.

Processing Pde Interface Conditions Ii, Tzvetan Drashansky, John R. Rice

Department of Computer Science Technical Reports

No abstract provided.

Dynamic File-Access Characteristics Of A Production Parallel Scientific Workload, David Kotz, Nils Nieuwejaar

Computer Science Technical Reports

Multiprocessors have permitted astounding increases in computational performance, but many cannot meet the intense I/O requirements of some scientific applications. An important component of any solution to this I/O bottleneck is a parallel file system that can provide high-bandwidth access to tremendous amounts of data in parallel to hundreds or thousands of processors. Most successful systems are based on a solid understanding of the characteristics of the expected workload, but until now there have been no comprehensive workload characterizations of multiprocessor file systems. We began the CHARISMA project in an attempt to fill that gap. We instrumented the common node …

How To Program In Ccsp, Beth Arrowsmith

Computer Science Technical Reports

No abstract provided.

Problem Solving Environments For Partial Differential Equation Based Applications (Ph.D. Thesis), Sanjiva Weerawarana

Department of Computer Science Technical Reports

No abstract provided.

Modeling With Collaborating Pde Solvers - Theory And Practice, Mo Mu, John R. Rice

Department of Computer Science Technical Reports

No abstract provided.

Timing Results Of A Parallel Fftsynth, Robert E. Lynch, Zhongyun Zhang

Department of Computer Science Technical Reports

No abstract provided.

Performance Of Combined Diversity Reception And Convolutional Coding For Qdpsk Land Mobile Radio, Huafei Zhou, Robert H. Deng, T. T. Tjhung

Research Collection School Of Computing and Information Systems

Diversity reception and error correction coding are powerful techniques to combat multipath fading encountered in mobile radio communications. In order to improve the transmission performance of the ?/4-shift QDPSK signal in mobile radio channels, the authors propose a new scheme of combined coding and diversity reception, i.e., combination of diversity reception employing code combining (CC) and convolutional coding employing error-and erasure correction Viterbi decoding. They also consider another combination scheme, i.e., combination of diversity reception employing postdetection maximal ratio combining (MRC) and convolutional coding employing hard decision Viterbi decoding. They theoretically analyze the performance of the schemes taking into account …

Optimum Symbol-By-Symbol Detection Of Uncoded Digital Data Over The Gaussian Channel With Unknown Carrier Phase, Pooi Yuen Kam, Seng Siew Ng, Tock Soon Ng

Research Collection School Of Computing and Information Systems

A theory of optimum receiver design for symbol-by-symbol detection of an uncoded digital data sequence received over the Gaussian channel with unknown carrier phase is presented. Linear suppressed-carrier modulation is assumed. The work here aims at laying a conceptual foundation for optimum symbol-by-symbol detection, and rectifies existing approaches to the problem. The optimum receiver structure is obtained explicitly for an arbitrary carrier phase model, but its computational requirements are too heavy in general for any practical implementation. In one important special case, namely, the case in which the carrier phase can be treated as a constant over some K+1 symbol …

Teaching The Practice Of Formal Methods In Distributed Computing Systems - A Module, Beth Arrowsmith, Bruce Mcmillin

Computer Science Technical Reports

No abstract provided.

A Study Of Computer Hardware And Software Usage In The Wichita, Kansas Area Business Community, Cheryl L. Rogers

Electronic Theses & Dissertations

For the purpose of informationally equipping educational institutions to prepare students for a future in the business world, this study was conducted with the intent of identifying and analyzing the current computer hardware and software used for word processing, spreadsheet, database, and desktop publishing tasks in Wichita, Kansas, selected area businesses and industries. In addition, this study was designed to determine the factors the business community respondents considered in choosing their computer hardware and software. Finally, the study was intended to ascertain the length of time since computer hardware and software changes had been made within the responding companies and …

Stability Analysis Of Quota Allocation Access Protocols In Ring Networks With Spatial Reuse, Leonidas Georgiadis, Wojciech Szpankowski, Leondros Tassiulas

Department of Computer Science Technical Reports

No abstract provided.

Bmmc Permutations On A Decmpp 12000/Sx 2000, Kristin Bruhl

Dartmouth College Undergraduate Theses

Increasingly, modern computing problems, including many scientific and business applications, require huge amounts of data to be examined, modified, and stored. Parallel computers can be used to decrease the time needed to operate on such large data sets, by allowing computations to be performed on many pieces of data at once. For example, on the DECmpp machine used in our research, there are 2048 processors in the parallel processor array. The DECmpp can read data into each of these processors, perform a computation in parallel on all of it, and write the data out again, theoretically decreasing the execution time …

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, Volume 10, Number 6, June 1994, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

A ten page newsletter created by the Wright State University College of Engineering and Computer Science that addresses the current affairs of the college.

A Conceptual Model For Multimedia Database Systems, Shunge Li, Xiangning Liu, Bharat Bhargava

Department of Computer Science Technical Reports

No abstract provided.

Scalar Field Modeling & Visualization On The Intel Delta, Chandrajit Bajaj, Kwun-Nan Lin

Department of Computer Science Technical Reports

No abstract provided.

Processing Pde Interface Conditions, John R. Rice

Department of Computer Science Technical Reports

No abstract provided.