Digital Commons Network^™

Atomic Broadcast In Heterogeneous Distributed Systems, Osman Zeineldine

Computer Science Theses & Dissertations

Communication services have long been recognized as possessing a dominant effect on both performance and robustness of distributed systems. Distributed applications rely on a multitude of protocols for the support of these services. Of crucial importance are multicast protocols. Reliable multicast protocols enhance the efficiency and robustness of distributed systems. Numerous reliable multicast protocols have been proposed, each differing in the set of assumptions adopted, especially for the communication network. These assumptions make each protocol suitable for a specific environment. The presence of different distributed applications that run on different LANs and single distributed applications that span different LANs mandate …

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 System Evaluation And Estimation Of Resources Software Estimation Model (Seer-Sem) For The Air Force Space And Missile Systems Center (Smc), Kolin D. Rathmann

Theses and Dissertations

This study examined whether calibration of the SEER-SEM impacted the effort estimates generated by the model for software developments- A historical database was provided by the Space and Missile System's Center Los Angeles, and used as the model's input data. The data was stratified into four usable platforms, military ground command and-control, military ground signal processing, military specification avionics, and military mobile. Each platform's data sets were split, the majority of points for calibration of the model, and the rest for model validation. The accuracy of SEER to this particular data set is limited, yet the model did respond to …

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 …

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.

Group Creativity And Technology, Keng Siau

Research Collection School Of Computing and Information Systems

Despite the popularity of brainstorming, research has shown that verbal brainstorming is not always effective in increasing group creativity. On the other hand, its electronic counterpart, electronic brainstorming, appears to produce much better results. Is technology the panacea for group idea generation? This paper first reviews the theory of group creativity and then examines the characteristics of electronic brainstorming that makes it more effective than verbal brainstorming. From the success of electronic brainstorming, it then argues that the use of technology might be the key to overcome the space and time constraints that are commonly faced by creativity groups.

A Comparative Evaluation Of Voice Versus Keypad Input For Manipulating Electronic Technical Data For Flight Line Maintenance Technicians, David A. Chapman, James R. Simmons

Theses and Dissertations

Interactive Electronic Technical Manuals will soon become a requirement for aircraft maintenance technicians. An important aspect in their development is the selection of an input device that will enhance, rather than impede, technician performance. The purpose of this thesis was to evaluate two types of input devices that can he used: a voice recognition input and a keypad input. Studies to date have evaluated the superiority of digital data over paper data, and advantages of using a Head Mounted Display Device over a flat screen laptop computer. No research has evaluated the input device. An experiment was conducted to determine …

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 …

Via-Rad: A Blackboard-Based System For Diagnostic Radiology, Erika Rogers

Computer Science and Software Engineering

The work described in this article presents an approach to the integration of computer displayed radiological images with cooperative computerized assistance for decision-making. The VIA-RAD system (Visual Interaction Assistant for Radiology) is a blackboard-based architecture, founded on extensive data collection and analysis in the domain of diagnostic radiology, together with cognitive modeling of the interaction between perception and problem-solving. The details of this system are presented in terms of domain knowledge representation and domain knowledge mapping. A small prototype of the system has been implemented and tested with radiology subjects, and the results of this study are also described.

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.

Signatures: A Language Extension For Improving Type Abstraction And Subtype Polymorphism In C++, Gerald Baumgartner, Vincent R. Russo

Department of Computer Science Technical Reports

No abstract provided.

Scis Networking - July 1995, Nova Southeastern University

CCIS Networking / SCIS Networking magazines

No abstract provided.

An Object Oriented Implemtation Of Fractal Image Compression, Darrell Burkhead

Masters Theses & Specialist Projects

The technique of Fractal Image Compression, although new, has been described in several ways. Thus far, all descriptions of this compression algorithm read by the author have been in procedural form. The purpose of this paper is to present the Fractal Image Compression algorithm in an object-oriented form and to point out the advantages of this organization. The main advantages of taking an object-oriented approach to this problem are flexibility and maintainability. Different aspects of this algorithm are handled by different objects, thereby allowing for easy customization and testing of each part. Another advantage of this approach is that the …

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 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.

Computational Science And The Future Of Computing Research, John R. Rice

Department of Computer Science Technical Reports

No abstract provided.

Frequency Computation And Bounded Queries (Conference Paper), William I. Gasarch, Efim Kinber

School of Computer Science & Engineering Faculty Publications

There have been several papers over the last ten years that consider the number of queries needed to compute a function as a measure of its complexity. The following function has been studied extensively in that light: FaA(x1, …, xa)=A(x1)···A(xa). We are interested in the complexity (in terms of the number of queries) of approximating FaA. Let b⩽a and let f be any function such that FaA(x1, …, x a) and f(x1, …, xa) agree on at least b bits. For a general set A we have matching upper and lower bounds that depend on coding theory. These are applied …

An Interactive Graphical User Interface Generator In The Client-Server Computational Model, Chavva Sudarshan

Masters Theses & Specialist Projects

Providing a user friendly and sophisticated user interface is a time-consuming and difficult task. On the other hand, the success of a software system is directly related to the quality of the user interface that it provides. In this thesis, a technique for the development of an automatic user interface is described and implemented; that is, we provide a tool that can be used to develop user interfaces on a platform known as the X-Window System. The hallmark of this tool is its ability to aid in developing reasonably sophisticated Graphical User Interfaces (GUI) interactively in relatively short time. The …

Accessing Earth System Science Data And Applications Through High-Bandwidth Networks, R. Vetter, M. Ali, M. Daily, J. Gabrynowic, Sunil G. Narumalani, K. Nygard, W. Perrizo, P. Ram, S. Reichenbach, G. A. Seielstad, W. White

School of Computing: Faculty Publications

In this paper, we discuss gigabit network applications enabled by "Mission to Planet Earth," an international effort to monitor the Earth as a system. We describe the design of a network architecture to support applications developed as part of this program; introduce a new component, public access resource centers (PARC9s); and discuss how PARC's would facilitate access by users outside the traditional research community. We also describe how a particular class of users, agriculture users, might to Planet Earth program and delivered in a value-added form to them by a so-called AgPARC. The suggested architecture requires the deployment of high-bandwidth …

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, Volume 11, Number 6, June 1995, 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.

The Rotations Of Maxillary Molars, Mandibular Molars, And Maxillary First Premolars In Acceptable Occlusions, G. Kristian Hansen

Loma Linda University Electronic Theses, Dissertations & Projects

The rotation of the maxillary molars is considered important in the orthodontic treatment of malocclusions. In this study a computer analysis program was developed to examine the rotations of maxillary molars, mandibular molars, and maxillary first premolars in casts of permanent dentitions with acceptable occlusions. Ninety three sets of untreated "acceptable occlusion" models from the collection of the Foundation for Orthodontic Research (FOR) were scanned on a flat bed scanner at 600 dots per inch (dpi). The images were analyzed using custom software on a computer. Measurements were made by relating maxillary first permanent molars to the midline, the archform, …

Pythia: A Knowledge Based System For Intelligent Scientific Computing, Sanjiva Weerawarana, Elias N. Houstis, John R. Rice, Anupam Joshi, Catherine E. Houstis

Department of Computer Science Technical Reports

No abstract provided.

//Ellpack: A System For Simulating Partial Differential Equations, Sanjiva Weerawarana, Elias N. Houstis, Ann C. Catlin, John R. Rice

Department of Computer Science Technical Reports

No abstract provided.

Parallel Ellpack Elliptic Pde Solvers, Elias N. Houstis, S. B. Kim, S. Markus, P. Wu, N. E. Houstis, S. Weerawarana

Department of Computer Science Technical Reports

No abstract provided.

Hodographs And Normals Of Rational Curves And Surfaces, Thomas W. Sederberg, Takafumi Saito, Guo-Jin Wang

Faculty Publications

Derivatives and normals of rational Bézier curves and surface patches are discussed. A non-uniformly scaled hodograph of a degree m x n tensor-product rational surface, which provides correct derivative direction but not magnitude, can be written as a degree (2m - 2) x 2n or 2m x (2n - 2) vector function in polynomial Bézier form. Likewise, the scaled normal direction is degree (3m - 2) x(3n - 2). Efficient methods are developed for bounding these directions and the derivative magnitude.

Biomedical Data Interpolation For 3-D Visualization, Ming-Chung Chen

Theses and Dissertations

Medical imaging devices that produce three-dimensional data usually produce the data in the form of image slices. In such images, the resolution in z direction is lower than in x and y directions. Before extracting and displaying objects in such images, an interpolated 3-D gray-scale volume image can be generated via image interpolation techniques to fill in the missing information. The subject of this thesis is the applying three different interpolation techniques to generate intermediate slices and comparing their qualities. The three interpolation techniques are linear interpolation, cubic spline interpolation, and Fourier interpolation. We also apply the CT image matching …