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A Method For Fast Revocation Of Public Key Certificates And Security Capabilities, D. Boneh, Xuhua Ding, Gene Tsudik, Chi Ming Wong Aug 2001

A Method For Fast Revocation Of Public Key Certificates And Security Capabilities, D. Boneh, Xuhua Ding, Gene Tsudik, Chi Ming Wong

Research Collection School Of Computing and Information Systems

We present a new approach to fast certificate revocation centered around the concept of an on-line semi-trusted mediator (SEM). The use of a SEM in conjunction with a simple threshold variant of the RSA cryptosystem (mediated RSA) offers a number of practical advantages over current revocation techniques. Our approach simplifies validation of digital signatures and enables certificate revocation within legacy systems. It also provides immediate revocation of all security capabilities. This paper discusses both the architecture and implementation of our approach as well as performance and compatibility with the existing infrastructure. Our results show that threshold cryptography is practical for …

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Generating Market Basket Data With Temporal Information, Yingjiu Li, Peng Ning, X. Sean Wang, Sushil Jajodia Aug 2001

Generating Market Basket Data With Temporal Information, Yingjiu Li, Peng Ning, X. Sean Wang, Sushil Jajodia

Research Collection School Of Computing and Information Systems

This paper presents a synthetic data generator that outputs timestamped transactional data with embedded temporal patterns controlled by a set of input parameters. In particular, calendar schema, which is determined by a hierarchy of input time granularities, is used as a framework of possible temporal patterns. An example of calendar schema is (year, month, day), which provides a framework for calendar-based temporal patterns of the form -38352 , where each is either an integer or the symbol . For example, is such a pattern, which corresponds to the time intervals consisting of all the 16th days of all months in …

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Role Of Use Case Diagram In Requirement Analysis, Keng Siau, L. Lee Aug 2001

Role Of Use Case Diagram In Requirement Analysis, Keng Siau, L. Lee

Research Collection School Of Computing and Information Systems

Since its debut and acceptance as a de facto standard of the object-oriented paradigm, UML has receivedcontroversial reviews. The most controversial diagramming technique in UML is undoubtedly the Use Casediagrams. Some claim that Use Case diagrams do not play a valuable role in requirement analysis. Othersargue that Use Case diagrams captured neither the static nor the dynamic aspects of the systems. The objective of this study is to investigate the role and value of Use Case diagrams in requirement analysis. We will investigate the information content of Use Case diagram and its role in requirement analysis.

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An Integrated Model On Computer Abuse: A Pilot Study, S. G. Lee, Fiona Fui-Hoon Nah, S. Yoo Aug 2001

An Integrated Model On Computer Abuse: A Pilot Study, S. G. Lee, Fiona Fui-Hoon Nah, S. Yoo

Research Collection School Of Computing and Information Systems

In spite of continuous organizational efforts and investments based on systematic factors, the incidence of computer abuse in organizations is still rapidly increasing. This paper proposes another perspective -- based on the general strain theory -- in preventing computer abuse. According to the general strain theory, organizational trust, which comprises organizational attachment, commitment, involvement, and norms, can prevent computer abuse by reducing insidersí computer abuse. The aim of this article is to assess the role of organizational trust from the perspectives of attachment, commitment, involvement, and norms in preventing computer abuse. The results indicate that both organizational trust and deterrent …

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Singapore Management University Launches The Bachelor Of Accountancy Degree, Singapore Management University Aug 2001

Singapore Management University Launches The Bachelor Of Accountancy Degree, Singapore Management University

SMU Press Releases and News

No abstract provided.

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Education Minister Radm Teo Chee Hean Announces Singapore Management University's New School Of Economics And Social Sciences At Smu Convocation 2001, Singapore Management University Aug 2001

Education Minister Radm Teo Chee Hean Announces Singapore Management University's New School Of Economics And Social Sciences At Smu Convocation 2001, Singapore Management University

SMU Press Releases and News

No abstract provided.

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Analysis Of A New Vehicle Scheduling And Location Problem, Ebru K. Bish, Thin Yin Leong, Chun-Lun Li, Jonathan W. C. Ng, David Simchi-Levi Aug 2001

Analysis Of A New Vehicle Scheduling And Location Problem, Ebru K. Bish, Thin Yin Leong, Chun-Lun Li, Jonathan W. C. Ng, David Simchi-Levi

Research Collection School Of Computing and Information Systems

We consider a container terminal discharging containers from a ship and locating them in the terminal yard. Each container has a number of potential locations in the yard where it can be stored. Containers are moved from the ship to the yard using a fleet of vehicles, each of which can carry one container at a time. The problem is to assign each container to a yard location and dispatch vehicles to the containers so as to minimize the time it takes to download all the containers from the ship. We show that the problem is NP-hard and develop a …

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Research Issues In Human-Computer Interaction In The Web-Based Environment, Fiona Fui-Hoon Nah, Sid Davis Aug 2001

Research Issues In Human-Computer Interaction In The Web-Based Environment, Fiona Fui-Hoon Nah, Sid Davis

Research Collection School Of Computing and Information Systems

The Internet and WWW are revolutionizing our daily lives and the way business is conducted. Since 1997, the Web has gradually evolved into a true economy and a new frontier for business. In this new Internet age, the design of a quality Web site is critical to the success of businesses. To attract and retain visitors, Web sites need to be human-centered, easy and quick to navigate, and speak the visitor’s language. User experience with the Web site is also important. The experience should be in line with the user’s goal and should feel natural to the user. Unfortunately, principles …

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Critical Factors For Successful Implementation Of Enterprise Systems, Fiona Fui-Hoon Nah, J. Lau, J. Kuang Aug 2001

Critical Factors For Successful Implementation Of Enterprise Systems, Fiona Fui-Hoon Nah, J. Lau, J. Kuang

Research Collection School Of Computing and Information Systems

Enterprise resource planning (ERP) systems have emerged as the core of successful information management and the enterprise backbone of organizations. The difficulties of ERP implementations have been widely cited in the literature but research on the critical factors for initial and ongoing ERP implementation success is rare and fragmented. Through a comprehensive review of the literature, 11 factors were found to be critical to ERP implementation success – ERP teamwork and composition; change management program and culture; top management support; business plan and vision; business process reengineering with minimum customization; project management; monitoring and evaluation of performance; effective communication; software …

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Video Partitioning By Temporal Slice Coherency, Chong-Wah Ngo, Ting-Chuen Pong, Roland T. Chin Aug 2001

Video Partitioning By Temporal Slice Coherency, Chong-Wah Ngo, Ting-Chuen Pong, Roland T. Chin

Research Collection School Of Computing and Information Systems

We present a novel approach for video partitioning by detecting three essential types of camera breaks, namely cuts, wipes, and dissolves. The approach is based on the analysis of temporal slices which are extracted from the video by slicing through the sequence of video frames and collecting temporal signatures. Each of these slices contains both spatial and temporal information from which coherent regions are indicative of uninterrupted video partitions separated by camera breaks. Properties could further be extracted from the slice for both the detection and classification of camera breaks. For example, cut and wipes are detected by color-texture properties, …

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A Multi-Agent Framework For Supporting Intelligent Fourth-Party Logistics, Hoong Chuin Lau, G. Lo Aug 2001

A Multi-Agent Framework For Supporting Intelligent Fourth-Party Logistics, Hoong Chuin Lau, G. Lo

Research Collection School Of Computing and Information Systems

A distributed intelligent agent-based framework that supports fourth-party logistics optimization under a web-based e-Commerce environment has been proposed in this paper. In the framework, customer job requests come through an e-Procurement service. These requests are consolidated and pushed to the e-Market Place service periodically. The e-Market Place then serves as a broker that allows intelligent agents to bid to serve these requests optimally in real-time by solving multiple instances of underlying logistics optimization problem. The resulting system was implemented based on the Java 2 Enterprise Edition (J2EE) platform using distributed system technology for communication between objects.

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Autoconfiguration, Registration And Mobility Management For Pervasive Computing, Archan Misra, Subir Das, Anthony Mcauley, Sajal K. Das Aug 2001

Autoconfiguration, Registration And Mobility Management For Pervasive Computing, Archan Misra, Subir Das, Anthony Mcauley, Sajal K. Das

Research Collection School Of Computing and Information Systems

In the vision of pervasive computing, users will exchange information and control their environments from anywhere using various wireline/wireless networks and computing devices. We believe that current protocols, such as DHCP, PPP, and Mobile IP, must be enhanced to support pervasive network access. In particular, this article identifies three fundamental functions: autoconfiguration, registration, and mobility management, that need such enhancements. Realizing that the IP autoconfiguration capabilities must be extended to configure routers and large dynamic networks, we first describe our autoconfiguration solution based on the dynamic configuration and distribution protocol (DCDP). Second, we discuss why providing user-specific services over a …

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The Effectiveness Of Institutional Activism, Gary L. Caton, Jeremy Goh, Jeffrey Donaldson Jul 2001

The Effectiveness Of Institutional Activism, Gary L. Caton, Jeremy Goh, Jeffrey Donaldson

Research Collection Lee Kong Chian School Of Business

Researchers examined earnings-forecast revisions and stock returns after release of the Focus List of poorly performing companies by the Council of Institutional Investors. Using Tobin's q as a measure of a company's ability to improve performance, researchers found significant and positive abnormal forecast revisions and post-release stock returns for companies with q greater than one. Findings support the proposition that institutional activism is effective for underperforming companies - but only those companies with the ability to respond to the challenge to improve performance.

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Application-Centric Analysis Of Ip-Based Mobility Management Techniques, Archan Misra, Subir Das, Prathima Agrawal Jul 2001

Application-Centric Analysis Of Ip-Based Mobility Management Techniques, Archan Misra, Subir Das, Prathima Agrawal

Research Collection School Of Computing and Information Systems

This paper considers three applications—VoIP, mobile Web access and mobile server-based data transfers—and evaluates the applicability of various IP-based mobility management mechanisms. We first survey the features and characteristics of various IP mobility protocols, such as MIPv4, MIPv6, MIP-RO, SIP, CIP, HAWAII, MIP-RR and IDMP, and then evaluate their utility on an application-specific basis. The diversity in the mobility-related requirements ensures that no single mobility solution is universally applicable. We recommend a hierarchical mobility architecture. The framework uses our Dynamic Mobility Agent (DMA) architecture for managing intra-domain mobility and multiple application-based binding protocols for supporting inter-domain mobility. Thus, we recommend …

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Is A Convertible Bond Call Really Bad News?, Louis H. Ederington, Jeremy C. Goh Jul 2001

Is A Convertible Bond Call Really Bad News?, Louis H. Ederington, Jeremy C. Goh

Research Collection Lee Kong Chian School Of Business

The article tests and rejects the hypothesis that managers call in-the-money convertibles when they view a decline in the value of the firm as likely. Inconsistent with this view, it finds that insiders generally buy equity before conversion-forcing calls. Also, analysts tend to raise their earnings forecasts following a call. There is no evidence that earnings analysts interpret a conversion-forcing call as bad news. Indeed there is evidence that, relative to firms in general, analysts are revising their earnings forecasts upward in the months surrounding conversion-forcing calls. The article concludes that an announcement of a conversion-forcing call of a firm's …

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Whose News About Justice? [Review Essay], Mark Findlay Jul 2001

Whose News About Justice? [Review Essay], Mark Findlay

Research Collection Yong Pung How School Of Law

Review of two books: Whose News About Justice? Nicholas Cowdery (2001), Getting Justice Wrong, Allen & Unwin, Sydney, ISBN 1865083224 & Jock Collins, Greg Noble, Scott Poynting & Paul Tabar (2001), Kebabs, Kids, Cops and Crime, Pluto Press, Sydney, ISBN 1864031131.

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Housing Policy, Wealth Formation And The Singapore Economy, Sock-Yong Phang Jul 2001

Housing Policy, Wealth Formation And The Singapore Economy, Sock-Yong Phang

Research Collection School Of Economics

This paper evaluates the contribution of housing policy in Singapore to financial sector development, housing wealth formation and macro-economic performance, both retrospectively and prospectively. It provides an overview of past housing policies and traces the linkages to the financial sector. Housing policy as effected through the Housing and Development Board and the Central Provident Fund (CPF) hampered the development of the commercial housing loans sector and domestic financial markets, but contributed to the overall growth and stability of the housing loans market and associated financial institutions. Housing policy and the trend of housing asset inflation contributed significantly to the formation …

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Gaussian Estimation Of Continuous Time Models Of The Short Term Interest Rate, Jun Yu, Peter C. B. Phillips Jul 2001

Gaussian Estimation Of Continuous Time Models Of The Short Term Interest Rate, Jun Yu, Peter C. B. Phillips

Research Collection School Of Economics

This paper proposes a Gaussian estimator for nonlinear continuous time models of the short term interest rate. The approach is based on a stopping time argument that produces a normalizing transformation facilitating the use of a Gaussian likelihood. A Monte Carlo study shows that the finite sample performance of the proposed procedure offers an improvement over the discrete approximation method proposed by Nowman (1997). An empirical application to U.S. and British interest rates is given.

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Recent Advances In Content-Based Video Analysis, Chong-Wah Ngo, Ting-Chuen Pong, Hong-Jiang Zhang Jul 2001

Recent Advances In Content-Based Video Analysis, Chong-Wah Ngo, Ting-Chuen Pong, Hong-Jiang Zhang

Research Collection School Of Computing and Information Systems

In this paper, we present major issues in video parsing, abstraction, retrieval and semantic analysis. We discuss the success, the difficulties and the expectations in these areas. In addition, we identify important opened problems that can lead to more sophisticated ways of video content analysis. For video parsing, we discuss topics in video partitioning, motion characterization and object segmentation. The success in video parsing, in general, will have a great impact on video representation and retrieval. We present three levels of abstracting video content by scene, keyframe and key object representations. These representation schemes in overall serve as a good …

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Secure And Private Distribution Of Online Video And Some Related Cryptographic Issues, Feng Bao, Robert H. Deng, Peirong Bao, Yan Guo, Hongjun Wu Jul 2001

Secure And Private Distribution Of Online Video And Some Related Cryptographic Issues, Feng Bao, Robert H. Deng, Peirong Bao, Yan Guo, Hongjun Wu

Research Collection School Of Computing and Information Systems

With the rapid growth of broadband infrastructure, it is thought that the bottleneck for video-on-demand service through Internet is being cleared. However, digital video content protection and consumers privacy protection emerge as new major obstacles. In this paper we propose an online video distribution system with strong content security and privacy protection. We mainly focus on the study of security and privacy problems related to the system. Besides presenting the new system, we intensively discuss some relevant cryptographic issues, such as content protection, private information retrieval, super-speed encryption/decryption for video, and PKC with fast decryption etc. The paper can be …

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Mobile Commerce: Promises, Challenges And Research Agenda, Keng Siau, Ee Peng Lim Jul 2001

Mobile Commerce: Promises, Challenges And Research Agenda, Keng Siau, Ee Peng Lim

Research Collection School Of Computing and Information Systems

Advances in wireless technology increase the number of mobile device users and give pace to the rapid development of e-commerce using these devices. The new type of e-commerce, conducting transactions via mobile terminals, is called mobile commerce. Due to its inherent characteristics such as ubiquity, personalization, flexibility, and dissemination, mobile commerce promises businesses unprecedented market potential, great productivity, and high profitability. This paper presents an overview of mobile commerce development by examining the enabling technologies, the impact of mobile commerce on the business world, and the implications to mobile commerce providers. The paper also provides an agenda for future research …

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What's Law Got To Do With It: Mapping Modern Mediation Movements In Civil And Common Law Jurisdictions, Nadja Alexander Jul 2001

What's Law Got To Do With It: Mapping Modern Mediation Movements In Civil And Common Law Jurisdictions, Nadja Alexander

Research Collection Yong Pung How School Of Law

Context defines mediation and has a direct impact on how it is practised. National legal contexts reveal historically embedded systemic differences that can provide insights into the reasons behind the rapid expansion of mediation in common law jurisdictions, and the comparatively hesitant development of mediation in civil law jurisdictions. In this article I consider the legal and political forces behind the modern mediation movements in Australia and Germany: two countries that represent the common law and the civil law traditions respectively.

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The Relationship Of Internal And External Commitment Foci To Objective Job Performance Measures, Mark A. Siders, Gerard George, Ravi Dharwadkar Jun 2001

The Relationship Of Internal And External Commitment Foci To Objective Job Performance Measures, Mark A. Siders, Gerard George, Ravi Dharwadkar

Research Collection Lee Kong Chian School Of Business

Prior research reports of a weak commitment-performance relationship can be attributed to inconsistency in conceptualization and measurement of the constructs. In this study, we differentially relate attitudinal commitment to internal (organization and supervisor) and external (customer) foci to objective measures of job performance. Results suggest that both internal foci are related to organizationally rewarded job performance and that the external focus influences job performance relevant to and rewarded by customers. Implications of these findings are discussed.

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Alternative Corporate Governance Systems In Japanese Firms: Implications For A Shift To Stockholder-Centered Corporate Governance, Toru Yoshikawa, Phillip H. Phan Jun 2001

Alternative Corporate Governance Systems In Japanese Firms: Implications For A Shift To Stockholder-Centered Corporate Governance, Toru Yoshikawa, Phillip H. Phan

Research Collection Lee Kong Chian School Of Business

In Asia, the recent catastrophic decline in regional stock markets, continuing currency crisis and failures of major financial institutions and industrial corporations have increased domestic and international interest in corporate governance. Nowhere is this greater than in Japan where financial institution reform has catapulted this to the fore. Agency theory and institutional theory, together with comparative case examples, are used in a study to derive some propositions on the dynamics of changing corporate governance systems in Japanese firms. The study argues for the co-existence of stakeholder and shareholder-centered corporate governance systems in Japan. This argument has an important implication for …

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Foreign Country Priorities In The Internationalization Process: A Measure And An Exploratory Test On British Firms, Timothy Adrian Robert Clark, Derek S. Pugh Jun 2001

Foreign Country Priorities In The Internationalization Process: A Measure And An Exploratory Test On British Firms, Timothy Adrian Robert Clark, Derek S. Pugh

Research Collection Lee Kong Chian School Of Business

After a critical analysis of the psychic distance aspect of the Uppsala model of internationalization and empirical studies to test it, this paper proposes a measure to enable comparison between target foreign countries in the priority given them in the internationalization process. An International Priority Index is developed for each target country, and used as the dependent variable in a model to analyze the effects of the independent variables of size of market, affluence of market, geographical distance and cultural distance on foreign country priority choice of home country firms. The measure and the model are given a first test …

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Genetic Algorithms For Communications Network Design - An Empirical Study Of The Factors That Influence Performance, Hsinghua Chou, G. Premkumar, Chao-Hsien Chu Jun 2001

Genetic Algorithms For Communications Network Design - An Empirical Study Of The Factors That Influence Performance, Hsinghua Chou, G. Premkumar, Chao-Hsien Chu

Research Collection School Of Computing and Information Systems

We explore the use of GAs for solving a network optimization problem, the degree-constrained minimum spanning tree problem. We also examine the impact of encoding, crossover, and mutation on the performance of the GA. A specialized repair heuristic is used to improve performance. An experimental design with 48 cells and ten data points in each cell is used to examine the impact of two encoding methods, three crossover methods, two mutation methods, and four networks of varying node sizes. Two performance measures, solution quality and computation time, are used to evaluate the performance. The results obtained indicate that encoding has …

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Mapping 'New' Geographies Of Religion: Politics And Poetics In Modernity, Lily Kong Jun 2001

Mapping 'New' Geographies Of Religion: Politics And Poetics In Modernity, Lily Kong

Research Collection School of Social Sciences

This article reviews geographical research on religion in the 1990s, and highlights work from neighbouring disciplines where relevant. Contrary to views that the field is incoherent, I suggest that much of the literature pays attention to several key themes, particularly, the politics and poetics of religious place, identity and community. I illustrate the key issues, arguments and conceptualizations in these areas, and suggest various ways forward. These 'new' geographies emphasize different sites of religious practice beyond the 'officially sacred'; different sensuous sacred geographies; different religions in different historical and place-specific contexts; different geographical scales of analysis; different constitutions of population …

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Effect Of Exponential Averaging On The Variability Of A Red Queue, Archan Misra, Teunis Ott, John Baras Jun 2001

Effect Of Exponential Averaging On The Variability Of A Red Queue, Archan Misra, Teunis Ott, John Baras

Research Collection School Of Computing and Information Systems

The paper analyzes how using a longer memory of the past queue occupancy in computing the average queue occupancy affects the stability and variability of a RED queue. Extensive simulation studies with both persistent and Web TCP sources are used to study the variance of the RED queue as a function of the memory of the averaging process. Our results show that there is very little performance improvement (and in fact, possibly significant performance degradation) if the length of memory is increased beyond a very small value. Contrary to current practice, our results show that a longer memory reduces the …

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Coping With Growth Transitions: The Case Of Chinese Family Businesses In Singapore, Wee-Liang Tan, Siew Tong Fock Jun 2001

Coping With Growth Transitions: The Case Of Chinese Family Businesses In Singapore, Wee-Liang Tan, Siew Tong Fock

Research Collection Lee Kong Chian School Of Business

Families control more than half of the corporations in East Asia. The contribution of family businesses to Asia's economic growth is predicated upon successfully growing their businesses. Many family businesses in East Asia, spanning countries such as Taiwan, Hong Kong, Indonesia, Singapore, and Malaysia, are Chinese owned and managed. Some claim that these businesses will never develop into full-fledged multinational enterprises because of their cultural heritage (Redding, 1990). However, some Chinese family businesses have successfully made the transition.This paper presents an in-depth study of five Chinese family businesses in Singapore that have successfully made the transition in growth and size …

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Communication And Shared Reality: Implications For The Psychological Foundations Of Culture, Ivy Yee-Man Lau, Chi-Yue Chiu, Sau-Lai Lee Jun 2001

Communication And Shared Reality: Implications For The Psychological Foundations Of Culture, Ivy Yee-Man Lau, Chi-Yue Chiu, Sau-Lai Lee

Research Collection School of Social Sciences

Lau et al present a conceptualization of the evolution of shared beliefs from individual interactions, focusing on the role of communication. They argue that the reciprocal relationship between shared reality and communication enables the development of systems of social representations at an individual level.

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