Digital Commons Network^™

Interfaces For Disk-Directed I/O, David Kotz

Computer Science Technical Reports

In other papers I propose the idea of disk-directed I/O for multiprocessor file systems. Those papers focus on the performance advantages and capabilities of disk-directed I/O, but say little about the application-programmer's interface or about the interface between the compute processors and I/O processors. In this short note I discuss the requirements for these interfaces, and look at many existing interfaces for parallel file systems. I conclude that many of the existing interfaces could be adapted for use in a disk-directed I/O system.

Implementation Of A Campuswide Distributed Mass Storage Service: The Dream Versus Reality, Betty Jo Armstead, Stephen Prahst

Armstead Publications and Presentations

In 1990, a technical team at NASA Lewis Research Center, Cleveland, Ohio, began defining a Mass Storage Service to provide long-term archival storage, short-term storage for very large files, distributed Network File System access, and backup services for critical data that resides on workstations and personal computers. Because of software availability and budgets, the total service was phased in over 3 years. During the process of building the service from the commercial technologies available, our Mass Storage Team refined the original vision and learned from the problems and mistakes that occurred. We also enhanced some technologies to better meet the …

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, Volume 11, Number 7, September 1995, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

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

Calibration Of The Software Architecture Sizing And Estimation Tool (Saset), Carl D. Vegas

Theses and Dissertations

This study attempted to analyze the effect of calibration on the performance of the SASET computer software cost estimating model. Data used for input into the model were drawn from the most current USAF SMC Software Database (SWDB). Once all the records to be used for analysis were identified, the DBMS-Calibration tool (which is part of SASET) was used to perform regression analysis on the relationship between program size (measured in SLOC) and the effort required to develop the program (measured in man-months). Productivity information reported from this tool was then input into equations used to calculate the Productivity Calibration …

Air Force Materiel Command (Afmc) Modeling, Simulation, And Analysis (Ms&A) Interactive Database, Timothy J. Wagner

Theses and Dissertations

This study develops a high level, unifying taxonomy for Modeling, Simulation, and Analysis (MS&A) products for the Air Force Materiel Command (AFMC). AFMC is concerned that limited resources are being expended on duplicative MS&A efforts. No mechanism exists that would confirm or deny this concern, so it was suggested that a database could be developed to catalog and track AFMC's MS&A inventory. First, it was necessary to determine the information that a decision maker needs to select a suitable MS&A product. Potential traits and characteristics were identified through review of current regulatory guidance, interviews with MS&A users, and a study …

An Architecture For A Camputs-Scale Wireless Mobile Internet, Douglas E. Comer, John C. Lin, Vincent F. Russo

Department of Computer Science Technical Reports

No abstract provided.

S-To-P Broadcasting On Coarse-Grained Machines, Susanne E. Hambrusch, Ashfaq A. Khokhar, Yi Liu

Department of Computer Science Technical Reports

No abstract provided.

Distributed And Collaborative Synthetic Environments, Chandrajit L. Bajaj, Fausto Bernardini

Department of Computer Science Technical Reports

No abstract provided.

Proceedings Of The Mspls Spring '95 Workshop, Gerald Baumgartner, Vincent R. Russo

Department of Computer Science Technical Reports

No abstract provided.

Vrware Beware: Vr At Siggraph, P.D. Quick

SWITCH

The article uses the author’s experiences from the event of Siggraph ‘95 to comment on upcoming products using virtual or augmented reality. The article includes further discussion on the products’ effects on the psychology and physiology of consumers. Some examples include the “i-Glasses” from Virtual I/O, the “Smart Model” from Multigen, as well as the nanomanipulator created by University of North Carolina Chapel Hill Department of Computer Science, and the Phobia Project developed by the Georgia Tech Graphics Visualization and Usability Center. The article also covers not only the products of this event, but also the courses, panels, papers, and …

Ua12/2/1 College Heights Herald, Vol. 71, No. Ii, Wku Student Affairs

WKU Administration Documents

WKU campus newspaper reporting campus, athletic and Bowling Green, Kentucky news. This issue contains articles:

• Vickrey, Eric & Charbonee LaBelle. Survey Aimed at Dropout Rate
• Good, Epha. NASA Grant Targets Minorities, Research
• Becker, Lori. Empty-Handed: Western Loses Out on $200,000 Gift in Will – Kathleen Carter
• LaBelle, Charbonee. Students Not Safe from Tow Trucks – Parking
• Weaver, Ron. Editorial Cartoon re: Pay Raise
• Slicing Pay-Raise Pie for Faculty, Staff
• Gentile, Mark. Non-Discrimination Policy Should Include Gays
• Gagliardi, Melissa. When in France, Know the Language
• Curtis, Stacy. Editorial Cartoon. Shannon Faulkner Quits Citadel
• Brown, Karen. Take Care of Business, Black Students …

Process Migration For Heterogeneous Distributed Systems, Matt Bishop, Mark Valence, Leonard F. Winiewski

Computer Science Technical Reports

The policies and mechanisms for migrating processes in a distributed system become more complicated in a heterogeneous environment, where the hosts may differ in their architecture and operating systems. These distributed systems include a large quantity and great diversity of resources which may not be fully utilized without the means to migrate processes to the idle resources. In this paper, we present a graph model for single process migration which can be used for load balancing as well as other non-traditional scenarios such as migration during the graceful degradation of a host. The graph model provides the basis for a …

Power Systems Marginal Cost Curve And Its Applications, Shaojun Wang, S. M. Shahidehpour, Nian-De Xiang

Kno.e.sis Publications

This paper presents a forward recursive procedure to calculate the expected system marginal cost curve (EMC). The EMC formulation allows for multi-state and multi-block dispatch of generating units and is used to determine the optimal energy of pumped-storage units. A new approach is developed to compute the first and second derivatives of the expected generation energy of a thermal unit with respect to the capacity of all thermal units in the system. The salient feature of the proposed approach is that it applies to hydro-thermal systems with multiple limited-energy hydro units.

An Integrated Framework For Learning And Reasoning, Christophe G. Giraud-Carrier, Tony R. Martinez

Faculty Publications

Learning and reasoning are both aspects of what is considered to be intelligence. Their studies within AI have been separated historically, learning being the topic of machine learning and neural networks, and reasoning falling under classical (or symbolic) AI. However, learning and reasoning are in many ways interdependent. This paper discusses the nature of some of these interdependencies and proposes a general framework called FLARE, that combines inductive learning using prior knowledge together with reasoning in a propositional setting. Several examples that test the framework are presented, including classical induction, many important reasoning protocols and two simple expert systems.

Measurement Of The D*± Cross Section In Two Photon Collisions At Lep, D. Buskulic, M. Thulasidas

Research Collection School Of Computing and Information Systems

The inclusive production of D∗± mesons in photon-photon collisions has been measured by the Aleph experiment at LEP with a beam energy of 45 GeV. The D∗+ are detected in their decay to D0π+ with the D0 observed in three separate decay modes: (1) K−π+, (2) K−π+π0 and (3) K−π+π−π+, and analagously for the D∗− modes. A total of 33 events was observed from an integrated luminosity of 73 pb−1 which corresponds to a cross section for Σ(e+e−→ e+e−D∗±X) of 155 ± 33 ± 21 pb. This result is compatible with both the direct production γγ → cc in the …

Data Replication In Distributed Database Systems Over Large Number Of Sites, Xiangning Liu, Bharat K. Bhargava

Department of Computer Science Technical Reports

No abstract provided.

Frequency Of Pattern Occurences In A (Dna) Sequence, Mireille Régnier, Wojciech Szpankowski

Department of Computer Science Technical Reports

No abstract provided.

Parallel Electronic Prototyping Of Physical Objects, Poting Wu, Elias N. Houstis

Department of Computer Science Technical Reports

No abstract provided.

Designing A Voice User Interface For A Fuzzy Expert System Tool (Fest), Scott Michael Josephson

Theses and Dissertations

This thesis deals with the design and implementation of a Voice User Interface for the Fuzzy Expert System Tool known as FEST. The interface has voice input and voice output capabilities which allows for a closer communication between the end-user and the computer. The thesis discusses the grammar language, user training, and specific library routines used for the voice input part of the interface. Also the creation and usage of digitized speech is discussed for the voice output part of the interface.

An Experimental Investigation Of The Effect Of Expert Decision Analyses And Explanations Support On Consensus And Decision Accuracy In Small Groups, Fiona Fui-Hoon Nah, I. Benbasat

Research Collection School Of Computing and Information Systems

An Expert Support System (ESS) provides expert advice to complement the knowledge of the decision maker, and is intended to support , rather than replace, the decision maker. The ESS technology provides two fundamental functions: (1) the ability to perform analyses and draw conclusions by providing users with expert opinions, judgments, evaluations and advice; (2) the ability to explain its reasoning and conclusions. The usefulness of expert support technology has been evaluated in a number of empirical studies. However these studies either examined the organizational impact of the technology [e.g., 1] or the use of the technology by single individuals …

Scis Networking - July 1995, Nova Southeastern University

CCIS Networking / SCIS Networking magazines

No abstract provided.

Restoration And Reconstruction Of Avhrr Images, Stephen E. Reichenbach, Daniel Kohler, Dennis Strelow

School of Computing: Faculty Publications

This paper describes the design of small convolution kernels for the restoration and reconstruction of Advanced Very High Resolution Radiometer (AVHRR) images. The kernels are small enough to be implemented efficiently by convolution, yet effectively correct degradations and increase apparent resolution. The kernel derivation is based on a comprehensive, end-to-end system model that accounts for scene statistics, image acquisition blur, sampling effects, sensor noise, and postfilter reconstruction. The design maximizes image fidelity subject to explicit constraints on the spatial support and resolution of the kernel. The kernels can be designed with h e r resolution than the image to perform …

A Statistical Approach To Mpeg Video Stream Characterization, Kubilay Cardakli

Electrical Engineering and Computer Science - Technical Reports

As video consumes a significant percentage of the available network bandwidth, understanding video bandwidth requirements will translate into better network control schemes. In this study, several commercially available video streams are statistically analyzed and several modeling approaches are developed. The segmentation techniques are found to be rewarding. However, the improvements due to complexity of the polynomial models are insignificant.

Predicting Conserved Water-Mediated Interactions In Protein Active Sites, Michael L. Raymer, Sridhar Venkataraman, William F. Punch, Erik D. Goodman, Brenda Kuhn

Kno.e.sis Publications

No abstract provided.

A Survey Of Mobile Computing Technologies And Applications, Anupam Joshi, Sanjiva Weerawarana, Ranjeewa A. Weerashighe, Tzvetan T. Drashansky, Narendran Ramakrishnan

Department of Computer Science Technical Reports

No abstract provided.

Mpse: Multidisciplinary Problem Solving Environments, Elias N. Houstis, John R. Rice, Anupam Joshi, Sanjiva Weerawarana, Elisha Sacks, Nien-Hwa Linda Wang, Christos Takoudis, Ahmed Sameh, Efstratios Gallopoulos

Department of Computer Science Technical Reports

No abstract provided.

Experimental Study Of Tcp And Udp Protocols For Future Distributed Databases, Xiangning Liu, Lebin Cheng, Bharat Bhargava, Zhiyuan Zhao

Department of Computer Science Technical Reports

No abstract provided.

Test Of The Flavour Independence Of Αs, D. Buskulic, Manoj Thulasidas

Research Collection School Of Computing and Information Systems

Using about 950 000 hadronic events collected during 1991 and 1992 with the ALEPH detector, the ratios r b = bs=udsc s and r uds = uds s =cbs have been measured in order to test the avour independence of the strong coupling constant s . The analysis is based on event{shape variables using the full hadronic sample, two b-quark samples enriched by lepton tagging and lifetime tagging, and a light-quark sample enriched by lifetime antitagging. The combined results are r b = 1:002 0:023 and r uds = 0:971 0:023.

Matching And Indexing Techniques In Rules, Madhav Moganti

Computer Science Technical Reports

Rules are widely used in present-day intelligent systems for modeling intelligent behavior, building expert systems, database rule systems, and advanced document retrieval systems. Most rule-based system programs are extremely computation-intensive and run quite slowly. This problem may get still worse when a rulebase does not fit into primary memory completely. This article reviews currently existing rule matching and indexing techniques. This report is organized into two parts. Part I presents the well known rule matching algorithms, Rete and TREAT, along with their performance evaluations. Part II presents rule indexing techniques for large scale rulebases. Here two sources of indexing are …

Fault Tolerance In Critical Real-Time Systems, Balaji Tirukarneswaran

Electrical & Computer Engineering Theses & Dissertations

Critical real-time applications require work to be completed before a predefined deadline, else the consequences may be catastrophic. The anticipation of faults in such systems necessitates the need for fault tolerance. Fault tolerance can be achieved in many different ways. A real-time system designer may impose restrictions on any of the system performance measures such as the latency, throughput and number of processors, depending on the type of application. In this work, several different fault tolerant strategies for any given DFG (Data Flow Graph) are discussed. DFG models are developed using the strategies and the resulting worst case performances a.re …