Digital Commons Network^™

Imprecise Answers In Distributed Environments: Estimation Of Information Loss For Multi-Ontology Based Query Processing, Eduardo Mena, Vipul Kashyap, Arantza Illarramendi, Amit P. Sheth

Kno.e.sis Publications

The World Wide Web is fast becoming a ubiquitous computing environment. Prevalent keyword-based search techniques are scalable, but are incapable of accessing information based on concepts. We investigate the use of concepts from multiple, real-world pre-existing, domain ontologies to describe the underlying data content and support information access at a higher level of abstraction. It is not practical to have a single domain ontology to describe the vast amounts of data on the Web. In fact, we expect multiple ontologies to be used as different world views and present an approach to "browse" ontologies as a paradigm for information access. …

View-Centric Reasoning About Parallel And Distributed Computation, Marc L. Smith

Retrospective Theses and Dissertations

The development of distributed applications has not progressed as rapidly as its enabling technologies. In part, this is due to the difficulty of reasoning about such complex systems. In contrast to sequential systems, parallel systems give rise to parallel events, and the resulting uncertainty of the observed order of these events. Loosely coupled distributed systems complicate this even further by introducing the element of multiple imperfect observers of these parallel events. The goal of this dissertation is to advance parallel and distributed systems development by producing a parameterized model that can be instantiated to reflect the computation and coordination properties …

Security In Distributed Systems - A Framework For Different Application Types, Ingo Stengel

Theses

Security is a factor which decides upon the applicability of distributed applications. Therefore this thesis deals with security in distributed systems. The complexity of the existing distributed technologies makes it necessary to reduce the number of distributed technologies considered in this thesis, i.e. concentrating on: Java, Mobile Agents and CORBA, where only Java-based mobile agents will be considered.

After a short review of basic security principles including firewalls, existing security problems in the above mentioned distributed technologies are analysed. Additional generic problems in distributed systems are outlined.

Solutions are referring to two different areas: those regarding security problems with firewalls …

Fages' Theorem And Answer Set Programming, Yuliya Lierler, Esta Erdem, Vladimir Lifschitz

Computer Science Faculty Proceedings & Presentations

We generalize a theorem by François Fages that describes the relationship between the completion semantics and the answer set semantics for logic programs with negotiation as failure. The study of this relationship is important in connection with the emergence of answer set programming. Whenever the two semantics are equivalent, answer sets can be computed by a satisfiability solver, and the use of answer set solvers such as SMODELS and DLV is unnecessary. A logic programming representation of the blocks world due to Ilkka Niemelä is discussed as an example.

Some Remarks On Fair Exchange Protocol, Jianying Zhou, Robert H. Deng, Feng Bao

Research Collection School Of Computing and Information Systems

Fair exchange turns out to be an increasingly important topic due to the rapid growth of electronic commerce. An exchange is deemed to be fair if at the end of exchange, either each party receives the expected item or neither party receives any useful information about the other’s item. Several protocols for fair exchange have been proposed in recent years. In this paper, we first examine a newly published fair exchange protocol and point out its flaws and weaknesses. We then put forward a more efficient and secure protocol and give an informal analysis.

Persistence Framework For Multiple Legacy Databases Of Patient Information Systems, Chin Heong Khor

Student Works (2000-2009)

The use of object-oriented technologies has led to a gap between object-oriented applications and legacy relational databases. A persistence framework can fill this gap by providing services to convert and store objects in relational databases and other forms of storage. A persistent object lasts beyond the execution of the application and can be retrieved at a later time. This project involves the development of an object persistence framework in the Java language to work with different storage mechanisms. while concentrating on transparency and reusability aspects. The persistence framework is made up of reusable and extendable sets of classes that provide …

Census 2000 Demographic And Housing Profile Reports, Mark Salling, Ellen Cyran, Sharon Bliss

All Maxine Goodman Levin School of Urban Affairs Publications

No abstract provided.

Design And Implementation Of A University Department Website, Margaret M. Rick

Graduate Research Papers

The website design cycle consists of four important components: (1) planning, (2) production, (3) implementation, and (4) operation. Within these components are a variety of vital tasks ranging from defining the objective and audience to conceptualizing the site, determining content, and creating, testing, and revising the site. Numerous rules or accepted principles guide the design process from color and font selection, to graphic creation, to site navigation layout. Once created, a website must be maintained: content should be updated and outside links verified on a regular basis. A site that is not maintained or kept current is of no benefit …

Control Chart Pattern Recognition Using Artificial Neural Networks, Şeref Sağiroğlu, Erkan Beşdok, Mehmet Erler

Turkish Journal of Electrical Engineering and Computer Sciences

Precise and fast control chart pattern (CCP) recognition is important for monitoring process environments to achieve appropriate control and to produce high quality products. CCPs can exhibit six types of pattern: normal, cyclic, increasing trend, decreasing trend, upward shift and downward shift. Except for normal patterns, all other patterns indicate that the process being monitored is not functioning correctly and requires adjustment. This paper describes a new type of neural network for speeding up the training process and to compare three training algorithms in terms of speed, performance and parameter complexity for CCP recognition. The networks are multilayered perceptrons trained …

Analysis Of Intangible Factors In Waste Minimization Projects, Halvard E. Nystrom, William Ralph Kehr

Engineering Management and Systems Engineering Faculty Research & Creative Works

Continual population growth and rising standards of living that accelerate the consumption of limited resources, are forcing society to encourage conservation of these resources. These resources not only include raw material, but also the areas to dispose of the wastes. As a result, communities are driving industries towards waste minimization by limiting waste generation and landfill availability. Firms'' environmentally friendly strategies can gain competitive advantage by leading in environmental practices. This advantage emanates from the reduction of risk of environmental regulatory overreaction, as well as improved asset utilization and landfill utilization. However, these intangible benefits are difficult to identify and …

Strategy Planning For Technological Discontinuities In A Changing Regulatory Environment, William Ralph Kehr, Halvard E. Nystrom

Engineering Management and Systems Engineering Faculty Research & Creative Works

This paper describes an approach to the analysis of publicly available financial data for individual industries. These methods enable the analyst to assess past practices and the historical rate of technological diffusion during the transition period of discontinuous technological change. This assessment can provide a basis of comparison for current changes in their industry. These methods are applied to small rural telephone companies during the period of 1960 to 1996. Annual data is presented detailing the change from aerial distribution cable to buried cable by the roughly 600 rural telephone companies financed through loans from the Rural Utilities Services, a …

Sistem Maklumbalas Bagi Sistem Maklumat Kesihatan, Abu Bakar Siti Fatimah

Student Works (2000-2009)

Perkembangan teknologi dan industri komputer yang semakin pesat, kini menjadi medan utama untuk setiap pihak bersaing. Penyediaan aspek mudah dan pantas menjadi pilihan utama dalam menghasilkan kerja yang lebih produktif dan berkualiti serta hasil kerja yang terbaik. Perkembangan yang positif ini membantu meningkatkan mutu pengurusan termasuklah pengurusan sistem. Sistem maklumbalas bagi sistem maklumat kesihatan, iaitu Sistem MBK yang akan dibangunkan ini bertujuan untuk membantu pihak yang terlibat da1am melicinkan urusan dan membantu mengatasi masalah yang dihadapi jika sistem manual digunakan. Tujuan pembangunan Sistem MBK ini adalah supaya pengguna dapat memberikan maklumbalas kepada pusat kesihatan dengan lebih mudah dan cepat. Sistem …

Student Information System (Online Course Registration System), Wai Keong Har

Student Works (2000-2009)

This Student Information System (SIS) will be developed with the objectives of utilizing the computer and Information technology to provide an easy and converuent online course registration system for the Faculty of Computer Science and Information Technology. This system promises a new dimension, which transcends across time and space. Time and space no longer are barriers. Students can register their courses at a different location and at a different time zone. SIS is a web-based application that uses to keep track of students' information. SIS consists of two sections that are student section and administrator section. Student section will be …

Sistem Inventori Farmasi, Embong Jamilah

Student Works (2000-2009)

Pada hari ini kemajuan Teknologi Maklumat semakin pesat berkembang. Organisasi kerajaan mahupun swasta menggunakan sistem komputer untuk: melicinkan lagi kerja yang dilakukan tiap hari Sistem lnventori Farmasi diperkenalkan bagi memudahkan kerja penyimpanan maklumat di kedai-kedai farmasi supaya kerja yaang dijalankan berjalan dengan lancar. Laporan ini bertujuan memberi penerangan serta gambaran tentang projek yang dijalankan ini. Kajian literasi memberi penerangan bagaimana kajian yang dilakukan sebelum dan sewaktu projek dijalankan. la juga menggambarkan tentang proses pembangunan perisian di mana ia diceritakan secara terperinci dalam bab analisis sistem rekabentuk, pengkodan dan pengujian. Akhir sekali, tentang operasi dan penilaian terhadap sistem di mana diberi …

Electronic Library System (Els), Wei Seng Loh

Student Works (2000-2009)

Electronic Library System (ELS) is a web based automation system which digitized manual library. Internet ploys a great role in determining the prospect of ELS. Web based system not only allow remote users to access the database of the library but also its enable the users to make use of the services provided by ELS. Therefore it is the perfect automation to convert a manual to a computerized library. The main objective of this system is basically about transforming the current manual system to the digital library. Besides upgrading and improving the overall performance of the system, this system will …

Sistem Sokongan Pensyarah Fsktm Universiti Malaya, Omar Azahari

Student Works (2000-2009)

"Sistem Sokongan Pensyarah" (SISOP) is a final project that is carried out after - its Importance was admitted by supervisor, Pn . Salimah Mokhtar . This system is important in keeping all activity including an activity among lecturer inside or outside of university. Activities that is carried out by lecturer such as publications, conferences, research which is like its involvement in the teaching field, consultancies and etc. All of these information are very important but there is no an alternative to develop this system before. As its objective, when this system is ready to use, it just not only keep …

State-Based Reconstructability Modeling For Decision Analysis, Michael S. Johnson, Martin Zwick

Complex Systems Faculty Publications and Presentations

Reconstructability analysis (RA) is a method for detecting and analyzing the structure of multivariate categorical data. Jones and his colleagues extended the original variable-based formulation of RA to encompass models defined in terms of system states (Jones 1982; Jones 1985; Jones 1985; Jones 1986; Jones 1989). In this paper, we demonstrate that Jones’ previous work comprises two separable ideas: the “g to k” transformation and state-based modeling. We relate the concept of state-based modeling to established variable-based RA methods (Klir 1985; Krippendorff 1986), and demonstrate that statebased modeling, when applied to event and decision tree models, is a valuable adjunct …

Mapcast : Real-Time Collaboration With Concept Maps, Brett Greay

Theses : Honours

This thesis describes the development of the application mapCAST, a computer-based concept-mapping tool that allows synchronous collaboration via TCP/IP networks, such as the Internet The useability and feasibility of mapCAST as a computer-based tool was examined and analysed in a real world situation. Results indicate that mapCAST is successful as a collaborative tool in a situations involving knowledge organisation, but lacks certain functionality that many Macintosh users are accustomed to.

Mobile Agents: Motivations And State-Of-The-Art Systems, Robert S. Gray, George Cybenko, David Kotz, Daniela Rus

Dartmouth Scholarship

A mobile agent is an executing program that can migrate, at times of its own choosing, from machine to machine in a heterogeneous network. On each machine, the agent interacts with stationary service agents and other resources to accomplish its task. In this chapter, we first make the case for mobile agents, discussing six strengths of mobile agents and the applications that benefit from these strengths. Although none of these strengths are unique to mobile agents, no competing technique shares all six. In other words, a mobile-agent system provides a single general framework in which a wide range of distributed …

Main Issues Rural Women Experience With Information & Communication Technology, Teresa Maiolo

All other publications

This brief report will outline the main issues rural women encountered with information and communications technology. This information was derived from interviewing twenty-one rural women from the South West, Eastern Goldfields, Murchison, Gascoyne, and Kimberley regions of Western Australia.

An Architectural Framework For Performance Analysis: Supporting The Design, Configuration, And Control Of Dis /Hla Simulations, David B. Cavitt

Computer Science Theses & Dissertations

Technology advances are providing greater capabilities for most distributed computing environments. However, the advances in capabilities are paralleled by progressively increasing amounts of system complexity. In many instances, this complexity can lead to a lack of understanding regarding bottlenecks in run-time performance of distributed applications. This is especially true in the domain of distributed simulations where a myriad of enabling technologies are used as building blocks to provide large-scale, geographically disperse, dynamic virtual worlds. Persons responsible for the design, configuration, and control of distributed simulations need to understand the impact of decisions made regarding the allocation and use of the …

Lsmac And Lsnait: Two Approaches For Cluster-Based Scalable Web Servers, Xuehong Gana, Trevor Schroeder, Steve Goddard, Byrav Ramamurthy

School of Computing: Conference and Workshop Papers

Server responsiveness and scalability are more important than ever in today’s client/server dominated network environments. Recently, researchers have begun to consider cluster-based computers using commodity hardware as an alternative to expensive specialized hardware for building scalable Web servers. In this paper, we present performance results comparing two cluster-based Web servers based on different server infrastructures: MAC-based dispatching (LSMAC) and IP-based dispatching (LSNAT). Both cluster-based server systems were implemented as application-space programs running on commodity hardware. We point out the advantages and disadvantages of both systems. We also identify when servers should be clustered and when clustering will not improve performance.

Virtual Topology Reconfiguration Of Wavelength-Routed Optical Wdm Networks, Byrav Ramamurthy, Ashok Ramakrishnan

School of Computing: Conference and Workshop Papers

The bandwidth requirements of the Internet are increasing every day and there are newer and more bandwidth-thirsty applications emerging on the horizon. Wavelength division multiplexing (WDM) is the next step towards leveraging the capabilities of the optical fiber, especially for wide-area backbone networks. The ability to switch a signal at intermediate nodes in a WDM network based on their wavelengths is known as wavelength-routing. One of the greatest advantages of using wavelength-routing WDM is the ability to create a virtual topology different from the physical topology of the underlying network. This virtual topology can be reconfigured when necessary, to improve …

Optical Communication Networks For The Next-Generation Internet, Arun K. Somani, Byrav Ramamurthy

School of Computing: Faculty Publications

Computer and telecommunication networks are changing the world dramatically and will continue to do so in the foreseeable future. The Internet, primarily based on packet switches, provides very flexible data services such as e-mail and access to the World Wide Web. The Internet is a variable-delay, variable- bandwidth network that provides no guarantee on quality of service (QoS) in its initial phase. New services are being added to the pure data delivery framework of yesterday. Such high demands on capacity could lead to a “bandwidth crunch” at the core wide-area network, resulting in degradation of service quality. Fortunately, technological innovations …

B. A Java Dialectic, Douglas Lyon, Frances Grodzinsky

School of Computer Science & Engineering Faculty Publications

Many books often gush over Java. People want to know, before they learn a language, what the drawbacks are for a language. They want to know what the strenghs are. After all, a computer language is just a tool. We shape our tools, and there after, our tools shape us! This chapter contains a dialog between three Java instructors. The participants are, Professors Good, Bad and Ugly. Professor Good is a strong proponent of Java. Professor Bad is a strong opponent of Java. Professor Ugly has been leaning toward the asthetic analysis of the language, particularly with an eye toward …

Measurements Of The Structure Of Quark And Gluon Jets In Hadronic Z Decays, R. Barate, M. Thulasidas

Research Collection School Of Computing and Information Systems

An experimental investigation of the structure of identified quark and gluon jets is presented. Observables related to both the global and internal structure of jets are measured; this allows for tests of QCD over a wide range of transverse momentum scales. The observables include distributions of jet-shape variables, the mean and standard deviation of the subjet multiplicity distribution and the fragmentation function for charged particles. The data are compared with predictions of perturbative QCD as well as QCD-based Monte Carlo models. In certain kinematic regions the measurements are sensitive mainly to perturbatively calculable effects, allowing for a test of QCD. …

Study Of Charm Production In Z Decays, R. Barate, M. Thulasidas

Research Collection School Of Computing and Information Systems

The production rates of D∗±D∗±, D∗±sDs∗±, D±D±, D0/D¯0D0/D¯0, D±sDs±, and Λ+c/Λ¯−cΛc+/Λ¯c− in Z→cc¯Z→cc¯ decays are measured using the LEP I data sample recorded by the ALEPH detector. The fractional energy spectrum of the D∗±D∗± is well described as the sum of three contributions: charm hadronisation, b hadron decays and gluon splitting into a pair of heavy quarks. The probability for a c quark to hadronise into a D∗+D∗+ is found to be f(c→D∗+)=0.233±0.010(stat.)±0.011(syst.)f(c→D∗+)=0.233±0.010(stat.)±0.011(syst.). The average fraction of the beam energy carried by D∗±D∗± mesons in Z→cc¯Z→cc¯ events is measured to be ⟨XE(D∗±)⟩cc¯=0.4878±0.0046(stat.)±0.0061(syst.).⟨XE(D∗±)⟩cc¯=0.4878±0.0046(stat.)±0.0061(syst.). The D∗±D∗± energy and the hemisphere mass imbalance …

An Integrated Data Mining System To Automate Discovery, Cecil Chua, Roger Hsiang-Li Chiang, Ee Peng Lim

Research Collection School Of Computing and Information Systems

Many data analysts require tools which can integrate their database management packages (e.g. Microsoft Access) with their data analysis ones (e.g. SAS, SPSS), and provide guidance for the selection of appropriate mining algorithms. In addition, the analysts need to extract and validate statistical results to facilitate data mining. In this paper, we describe an integrated data mining system called the Linear Correlation Discovery System (LCDS) that meets the above requirement. LCDS consists of four major sub-components, two of which, the selection assistant and the statistics coupler, are discussed in this paper. The former examines the schema and instances to determine …

Information Technology In The Health Care Industry: A Primer, P. Southard, S. J. Hong, Keng Siau

Research Collection School Of Computing and Information Systems

The paper discusses current and future applications of information technology within the healthcareindustry. It presents some broad strategies for approaching information technology investments and various tools available.

Persistence Differences In Community College Courses Taught In Classrooms And Through Alternative Formats, Andrew A. Runyan

CCAC Theses and Dissertations

While distance education programs continue to expand, the occurrence of higher dropout rates in those programs as compared to the same courses offered in lecture/lab settings remains a point of contention between supporters and detractors of non-traditional forms of education. This study used a foundation of research on dropout in higher education as the basis for an investigation of dropout rates in non-traditional forms of instruction in a community college setting. Course delivery formats studied included videotape-based courses, Internet-based courses, and courses offered in a self-paced laboratory environment. For each of these formats, the same course, offered in a lecture/lab …