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2002

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Articles 121 - 150 of 208

Full-Text Articles in Computer Engineering

On Symmetric Solution Sets, Goetz Alefeld, Vladik Kreinovich, Guenter Mayer Jan 2002

On Symmetric Solution Sets, Goetz Alefeld, Vladik Kreinovich, Guenter Mayer

Departmental Technical Reports (CS)

Given an n x n interval matrix [A] and an interval vector [b] with n components we present an overview on existing results on the solution set S of linear systems of equations Ax=b with symmetric matrices A from [A] and vectors b from [b]. Similarly we consider the set E of eigenpairs associated with the symmetric matrices A from [A]. We report on characterizations of S by means of inequalities, by means of intersection of sets, and by an approach which is generalizable to more general dependencies of the entries. We also recall two methods for enclosing S by …

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Probability Of Implication, Logical Version Of Bayes Theorem, And Fuzzy Logic Operations, Hung T. Nguyen, Masao Mukaidono, Vladik Kreinovich Jan 2002

Probability Of Implication, Logical Version Of Bayes Theorem, And Fuzzy Logic Operations, Hung T. Nguyen, Masao Mukaidono, Vladik Kreinovich

Departmental Technical Reports (CS)

Logical inference starts with concluding that if B implies A, and B is true, then A is true as well. To describe probabilistic inference rules, we must therefore define the probability of an implication "A if B". There exist two different approaches to defining this probability, and these approaches lead to different probabilistic inference rules: We may interpret the probability of an implication as the conditional probability P(A|B), in which case we get Bayesian inference. We may also interpret this probability as the probability of the material implication "A or not B", in which case we get different inference rules. …

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Computational Complexity Of Planning With Discrete Time And Continuous State Variables, Chitta Baral, Vladik Kreinovich Jan 2002

Computational Complexity Of Planning With Discrete Time And Continuous State Variables, Chitta Baral, Vladik Kreinovich

Departmental Technical Reports (CS)

Traditionally, most planning research in AI was concentrated on systems whose state can be characterized by discrete-valued fluents. In many practical applications, however, we want to control systems (like robots) whose state can only be described if we used continuous variables (like coordinates). Planning for such systems corresponds, crudely speaking, to Level 2 of the planing language PDDL2.1. In this paper, we analyze the computational complexity of such planning problems.

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Logserver Monitor For Managing Log Messages Of Applications, Lilin Zhu Jan 2002

Logserver Monitor For Managing Log Messages Of Applications, Lilin Zhu

Theses Digitization Project

This project is a graphical user interface for managing log information. Logging is an important componet of a software development cycle as well as for diagnostics of performance and monitoring of the software after deployment. The LogServer Monitor provides a graphical user interface for the display and management of logged information from a distributed environment.

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Web-Based Interactive Self-Evaluation System For Computer Science In Generic Tutorial System For The Sciences Project, Supachai Praritsantik Jan 2002

Web-Based Interactive Self-Evaluation System For Computer Science In Generic Tutorial System For The Sciences Project, Supachai Praritsantik

Theses Digitization Project

The goal of this master project is to promote and facilitate the use of new web-based and Java-based technologies in the development of self-evaluation systems for computer science; in particular, analysis of sorting algorithms.

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Java Prototype Of Hypercard Bibliography Past Implementation And Present Choices, Neeta Reddy Jan 2002

Java Prototype Of Hypercard Bibliography Past Implementation And Present Choices, Neeta Reddy

Theses Digitization Project

This project was started with JDK Version 1.0 and was later upgraded to version JDK Version 1.2.2, to create a graphical user interface using the Abstract Window Toolkit (AWT) to a HyperCard bibliography of software engineering. The bibliographic index tool is designed to facilitate searching for text and is run as a Java applet. It presents an alphabetically ordered list of author names and subjects. With the bibliography index tool one can manipulate a bibliographic list directly over the World Wide Web on a computer that lists electronic bibliographies.

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Personal Software Process (Psp) Scriber, Heng-Jui Tsao Jan 2002

Personal Software Process (Psp) Scriber, Heng-Jui Tsao

Theses Digitization Project

Personal Software Process (PSP) Scriber is a Web-based software engineering tool designed to implement an automatic system for performing PSP. The basis of this strategy is a set of tools to facilitate collection and analysis of development data. By analyzing the collected data, the developer can make informed, accurate decisions about their individual development effort.

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Mobile Order Entry System Based On The Wireless Technology, Sumit Imsuksri Jan 2002

Mobile Order Entry System Based On The Wireless Technology, Sumit Imsuksri

Theses Digitization Project

The sales representatives primary duties are to attract wholesale and retail buyers and purchasing agents to their merchandise, and to address any of their client's questions or concerns. Aided by a laptop computer connected to the Internet, they can access the customer information and sell products to their customer immediately. This project, a Mobile Order Entry System using cellphones, will give sales representatives as state-of-the-art alternative in accessing anf selling products to their customers through cell phones instead of using laptop computers.

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Javaserver Page, Java Servlet And Javabean Technology: Online Real Estate Company, Kevin Tzu-Jung Chen Jan 2002

Javaserver Page, Java Servlet And Javabean Technology: Online Real Estate Company, Kevin Tzu-Jung Chen

Theses Digitization Project

This project will simulate an online real estate company using JSP, Java Servlet and JavaBean technology.

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Wireless Messaging And Project Management System, Bhrigu Celly Jan 2002

Wireless Messaging And Project Management System, Bhrigu Celly

Theses Digitization Project

Wireless is an important part of the future and utilizing the wireless technology in project management is a great tool. This project is a messaging system designed using WAP and Java Server pages, as both of them are the technologies of the future. The project puts together a tool to help in project management made with the use of Java Server Pages and MySQL as the backend database. It uses Wireless Markup Language as the basic language for the cellular phones and the hand held wireless devices. The prototype has been modeled on project planning for power plants done by …

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Spider Iii: A Multi-Agent-Based Distributed Computing System, Jianhua Ruan, Han-Shen Yuh, Koping Wang Jan 2002

Spider Iii: A Multi-Agent-Based Distributed Computing System, Jianhua Ruan, Han-Shen Yuh, Koping Wang

Theses Digitization Project

The project, Spider III, presents architecture and protocol of a multi-agent-based internet distributed computing system, which provides a convenient development and execution environment for transparent task distribution, load balancing, and fault tolerance. Spider is an on going distribution computing project in the Department of Computer Science, California State University San Bernardino. It was first proposed as an object-oriented distributed system by Han-Sheng Yuh in his master's thesis in 1997. It has been further developed by Koping Wang in his master's project, of where he made large contribution and implemented the Spider II System.

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A Doctor-Patient Communication Tool (Dpct) Ryodoroku Application On The Web, Hongwei Bi Jan 2002

A Doctor-Patient Communication Tool (Dpct) Ryodoroku Application On The Web, Hongwei Bi

Theses Digitization Project

No abstract provided.

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An On-Line Acid-Base Titration Applet In The Generic Tutorial System For The Sciences Project, Thomas Lee Gummo Jan 2002

An On-Line Acid-Base Titration Applet In The Generic Tutorial System For The Sciences Project, Thomas Lee Gummo

Theses Digitization Project

The purpose of this Master's Project was to develop an Acid-Base Titration Simulator. It was also to be a part of the California State University - San Bernardino's GTSS, Generic Tutorial System for the Sciences, project. The main benefit is that students will be able to conduct titration experiments over the Internet without being in the laboratory and without costly equipment or dangerous chemicals. Instructors at the high school and college level can demonstrate the key principles of titration.

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Implementation And Validation Of Range Imaging On A Uhf Radar Wind Profiler, P. B. Chilson, Tian-You Yu, Richard G. Strauch, Andreas Muschinski, Robert D. Palmer Jan 2002

Implementation And Validation Of Range Imaging On A Uhf Radar Wind Profiler, P. B. Chilson, Tian-You Yu, Richard G. Strauch, Andreas Muschinski, Robert D. Palmer

Department of Electrical and Computer Engineering: Faculty Publications

The available range resolution of pulsed radar wind profilers is usually limited by bandwidth restrictions. Range imaging (RIM) has recently been developed as a means of mitigating these limitations by operating the wind profilers over a small set of distinct transmitter frequencies. A constrained optimization method can then be used to generate high-resolution maps of the reflectivity field as a function of range. This paper presents a description of how the RIM technique has been recently implemented on the Platteville 915-MHz tropospheric profiler, the first such implementation at UHF. Examples of data collected during a two-part experiment on 10 April …

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Automatic Referencing Of Multi-Spectral Images, Roberto Araiza, Hongjei Xie, Scott A. Starks, Vladik Kreinovich Jan 2002

Automatic Referencing Of Multi-Spectral Images, Roberto Araiza, Hongjei Xie, Scott A. Starks, Vladik Kreinovich

Departmental Technical Reports (CS)

No abstract provided.

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Non-Destructive Testing Of Aerospace Structures: Granularity And Data Mining Approach, Roberto Osegueda, Vladik Kreinovich, Lakshmi Potluri, Richard Alo Jan 2002

Non-Destructive Testing Of Aerospace Structures: Granularity And Data Mining Approach, Roberto Osegueda, Vladik Kreinovich, Lakshmi Potluri, Richard Alo

Departmental Technical Reports (CS)

For large aerospace structures, it is extremely important to detect faults, and non-destructive testing is the only practical way to do it. Based on measurements of ultrasonic waves, Eddy currents, magnetic resonance, etc., we reconstruct the locations of the faults. The best (most efficient) known statistical methods for fault reconstruction are not perfect. We show that the use of expert knowledge-based granulation improves the quality of fault reconstruction.

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Uncertainty In Risk Analysis: Towards A General Second-Order Approach Combining Interval, Probabilistic, And Fuzzy Techniques, Scott Ferson, Lev Ginzburg, Vladik Kreinovich, Hung T. Nguyen, Scott A. Starks Jan 2002

Uncertainty In Risk Analysis: Towards A General Second-Order Approach Combining Interval, Probabilistic, And Fuzzy Techniques, Scott Ferson, Lev Ginzburg, Vladik Kreinovich, Hung T. Nguyen, Scott A. Starks

Departmental Technical Reports (CS)

Uncertainty is very important in risk analysis. A natural way to describe this uncertainty is to describe a set of possible values of each unknown quantity (this set is usually an interval), plus any additional information that we may have about the probability of different values within this set. Traditional statistical techniques deal with the situations in which we have a complete information about the probabilities; in real life, however, we often have only partial information about them. We therefore need to describe methods of handling such partial information in risk analysis. Several such techniques have been presented, often on …

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Use Of Satellite Image Referencing Algorithms To Characterize Asphaltic Concrete Mixtures, Scott A. Starks, Soheil Nazarian, Vladik Kreinovich, Joseph Adidhela Jan 2002

Use Of Satellite Image Referencing Algorithms To Characterize Asphaltic Concrete Mixtures, Scott A. Starks, Soheil Nazarian, Vladik Kreinovich, Joseph Adidhela

Departmental Technical Reports (CS)

A natural way to test the structural integrity of a pavement is to send signals with different frequencies through the pavement and compare the results with the signals passing through an ideal pavement. For this comparison, we must determine how, for the corresponding mixture, the elasticity E depends on the frequency f in the range from 0.1 to 10^5 Hz. It is very expensive to perform measurements in high frequency area (above 20 Hz). To avoid these measurements, we can use the fact that for most of these mixtures, when we change a temperature, the new dependence changes simply by …

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Extending Direct Manipulation In A Text Editor, David G. Novick, Francisco Romero, Edgar Rene Saenz, Armando Sandoval Jan 2002

Extending Direct Manipulation In A Text Editor, David G. Novick, Francisco Romero, Edgar Rene Saenz, Armando Sandoval

Departmental Papers (CS)

This paper describes the implementation of a prototype text editor that incorporates conversation-like features through the direct-manipulation modality. In this way, traditional direct-manipulation interaction techniques such as direct reference via pointing can be extended to include techniques more commonly associated with human conversation, such as negotiation of reference. The paper illustrates the use of the prototype with an extended example, and discusses research issues raised by the implementation.

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A 0.5 Μm Thick Polysilicon Schottky Diode With Rectification Ratio Of 10^6, Elena A. Guliants, Chunhai Ji, Young J. Song, Wayne A. Anderson Jan 2002

A 0.5 Μm Thick Polysilicon Schottky Diode With Rectification Ratio Of 10^6, Elena A. Guliants, Chunhai Ji, Young J. Song, Wayne A. Anderson

Electrical and Computer Engineering Faculty Publications

Polycrystalline Si films, 0.5-mm thick, were obtained as a result of metal-induced growth by sputtering from a Si target on 25 nm thick Ni prelayers at 525 °C. Silicon grew heteroepitaxially on the NiSi2 layer formed due to the reaction between the sputtered Si atoms and Ni. Schottky diodes were fabricated on the Si films by deposition of a Schottky metal on the front surface of the film while Ni disilicide provided an intimate ohmic contact at the back. A Pd/n-Si diode using an n-Si film annealed for 2 h at 700 °C in forming gas demonstrated a rectification ratio …

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Sar Simulations In Wireless Communication And Safety Discussions In The Society, M. O. Özyalçin, Funda Akleman, Levent Sevgi̇ Jan 2002

Sar Simulations In Wireless Communication And Safety Discussions In The Society, M. O. Özyalçin, Funda Akleman, Levent Sevgi̇

Turkish Journal of Electrical Engineering and Computer Sciences

Numerical simulation in cellular phone - human tissue interaction is discussed in this paper. The powerful time domain (TD) techniques, the transmission line matrix (TLM) and the finite-difference time-domain (FDTD) methods, are used to model mutual effects. The purpose is to calculate specific absorption rate (SAR; defined as the power absorbed by the unit mass of the tissue), validate the codes and verify the results. Also, effectiveness of the SAR parameter in determination of the exposure limits for human health and environmental pollution is discussed.

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Preface, Alexander Kurz Jan 2002

Preface, Alexander Kurz

Engineering Faculty Articles and Research

No abstract provided.

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Definability, Canonical Models, And Compactness For Finitary Coalgebraic Modal Logic, Alexander Kurz, Dirk Pattinson Jan 2002

Definability, Canonical Models, And Compactness For Finitary Coalgebraic Modal Logic, Alexander Kurz, Dirk Pattinson

Engineering Faculty Articles and Research

This paper studies coalgebras from the perspective of the finitary observations that can be made of their behaviours. Based on the terminal sequence, notions of finitary behaviours and finitary predicates are introduced. A category Behω(T) of coalgebras with morphisms preserving finitary behaviours is defined. We then investigate definability and compactness for finitary coalgebraic modal logic, show that the final object in Behω(T) generalises the notion of a canonical model in modal logic, and study the topology induced on a coalgebra by the finitary part of the terminal sequence.

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Initial Experiences Gained And Initiatives Employed In The Teaching Of Java Programming In The Institute Of Technology Tallaght, Eamonn Hyland, Gary Clynch Jan 2002

Initial Experiences Gained And Initiatives Employed In The Teaching Of Java Programming In The Institute Of Technology Tallaght, Eamonn Hyland, Gary Clynch

Conference Papers

This paper describes recent experiences gained and initiatives employed in the teaching of Java programming to first and second year students in the Institute of Technology Tallaght from September 2000 to March 2002. It outlines some elearning, technological and pedagogical initiatives that were undertaken within the department and the resultant preliminary outcomes. The outcomes have been determined after detailed analysis of the results of a survey which was commissioned to determine the effectiveness of the initiatives and also to identify those parts of the Java language which were causing students particular difficulty. The students surveyed are currently completing their fourth …

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Walkthrough In Complex Environments At Interactive Rates Using Level-Of-Detail, Alper Selçuk, Uğur Güdükbay, Bülent Özgüç Jan 2002

Walkthrough In Complex Environments At Interactive Rates Using Level-Of-Detail, Alper Selçuk, Uğur Güdükbay, Bülent Özgüç

Turkish Journal of Electrical Engineering and Computer Sciences

One of the biggest problems in computer graphics is displaying huge geometric models at interactive rates. A lot of work has been done to achieve the required frame-rates in architecture, simulation, computer-aided design and entertainment applications. In this paper, a system that enables walkthrough in complex environments using level-of-detail approximations is explained. The system uses hierarchical triangulated models as input. In the preprocessing phase, multiresolution models of objects are created using polygonal simplification techniques. During walkthrough, fast frustum culling based on bounding boxes is performed to eliminate branches of hierarchy that are not visible. An appropriate level for detail of …

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A New Petri-Net-Based Synthesis Technique For Supervisory Control Of Discrete Event Systems, Murat Uzam, Anthony H. Jones Jan 2002

A New Petri-Net-Based Synthesis Technique For Supervisory Control Of Discrete Event Systems, Murat Uzam, Anthony H. Jones

Turkish Journal of Electrical Engineering and Computer Sciences

A new Petri-net-based top-down synthesis technique for supervisory control of Discrete Event Systems (DES) is proposed to solve the forbidden state problem. The supervisors obtained are compiled supervisors, whose control policy is represented as a net structure, as opposed to mapping supervisors, whose control policy is computed as a feedback function of the marking of the system. The compiled supervisors obtained by using the technique proposed in this paper are both nonblocking and maximally permissive. The supervisors to be synthesised consist of a controlled Automation Petri Net model of the system. Automation Petri Nets (APN) include the following extensions to …

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A Note On The Poisson Summation Formula And Its Application To Electromagnetic Problems Involving Cylindrical Coordinates, Anastassios H. Panaretos, Hristos T. Anastassiu, Dimitra I. Kaklamani Jan 2002

A Note On The Poisson Summation Formula And Its Application To Electromagnetic Problems Involving Cylindrical Coordinates, Anastassios H. Panaretos, Hristos T. Anastassiu, Dimitra I. Kaklamani

Turkish Journal of Electrical Engineering and Computer Sciences

A modified version of the Poisson Summation Formula is derived,involving the Fourier-Bessel Transform of the kernel function, as opposed to the conventional Fourier Transform engaged in the standard formula. This novel form can be applied to problems employing cylindrical coordinates, such as the fast evaluation of the dyadic Green's function in a waveguide or cavity of circular cross-section.

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A Time Domain Uniform Geometrical Theory Of Slope Diffraction For A Curved Wedge, Prabhakar H. Pathak, Paul R. Rousseau Jan 2002

A Time Domain Uniform Geometrical Theory Of Slope Diffraction For A Curved Wedge, Prabhakar H. Pathak, Paul R. Rousseau

Turkish Journal of Electrical Engineering and Computer Sciences

A time domain version of the uniform geometrical theory of diffraction (TD-UTD) is developed to describe, in essentially closed form, the field which is produced via slope diffraction at a perfectly conducting, arbitrarily curved wedge excited by a time impulsive wave that exhibits a rapid spatial variation near the edge of the wedge. This TD-UTD slope diffracted field for a curved wedge is obtained by a Fourier inversion of the corresponding frequency domain UTD expression. An analytical signal representation of the transient fields is used since it is convenient, and because it circumvents some of the difficulties, which especially arise …

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A Novel Mom Approach For Obtaining Accurate And Efficient Solutions In Optical Rib Waveguide, Namik Yener, Ercan Topuz Jan 2002

A Novel Mom Approach For Obtaining Accurate And Efficient Solutions In Optical Rib Waveguide, Namik Yener, Ercan Topuz

Turkish Journal of Electrical Engineering and Computer Sciences

The optical rib waveguide (ORW) plays an important role in the design of several integrated optical devices. Various methods have been proposed for obtaining the modal field solutions in ORW. However, to the best of our knowledge none of them is capable of providing accurate full-wave benchmark solutions. Here we present a novel MoM approach wherein the modes of a loaded rectangular waveguide are utilized as basis functions and demonstrate that this approach is very efficient and yields highly accurate full-wave results which can serve as benchmark solutions in assessing the quality of the data reported in the literature.

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An Efficient Middleware Architecture Supporting Real-Time Distributed Object Programming, Erhan Saridoğan, Nadi̇a Erdoğan Jan 2002

An Efficient Middleware Architecture Supporting Real-Time Distributed Object Programming, Erhan Saridoğan, Nadi̇a Erdoğan

Turkish Journal of Electrical Engineering and Computer Sciences

With the increasing demand for distributed real-time systems, the need for programming tools and execution platforms useful in development of such application systems is widely recognized. This paper presents CORD-RTS, an efficient middleware architecture that provides support for real-time distributed object programming. The communication infrastructure and various components of the middleware, which support several modes of interactions among distributed real-time objects, along with its real-time features and services, are discussed in detail.

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