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A New Approach For Weighted Constraint Satisfaction, Hoong Chuin Lau Apr 2002

A New Approach For Weighted Constraint Satisfaction, Hoong Chuin Lau

Research Collection School Of Computing and Information Systems

We consider the Weighted Constraint Satisfaction Problem which is an important problem in Artificial Intelligence. Given a set of variables, their domains and a set of constraints between variables, our goal is to obtain an assignment of the variables to domain values such that the weighted sum of satisfied constraints is maximized. In this paper, we present a new approach based on randomized rounding of semidefinite programming relaxation. Besides having provable worst-case bounds for domain sizes 2 and 3, our algorithm is simple and efficient in practice, and produces better solutions than some other polynomial-time algorithms such as greedy and …

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An Intelligent Middleware For Linear Correlation Discovery, Cecil Chua, Roger Hsiang-Li Chiang, Ee Peng Lim Mar 2002

An Intelligent Middleware For Linear Correlation Discovery, Cecil Chua, Roger Hsiang-Li Chiang, Ee Peng Lim

Research Collection School Of Computing and Information Systems

Although it is widely accepted that research from data mining, knowledge discovery, and data warehousing should be synthesized, little research addresses the integration of existing data management and analysis software. We develop an intelligent middleware that facilitates linear correlation discovery, the discovery of associations between attributes and attribute groups. This middleware integrates data management and data analysis tools to improve traditional data analysis in three perspectives: (1) identify appropriate linear correlation functions to perform based on the semantics of a data set; (2) execute appropriate functions contained in the data analysis packages; and (3) derive useful knowledge from data analysis.

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Idmp-Based Fast Handoffs And Paging In Ip-Based 4g Mobile Networks, Archan Misra, Subir Das, Anthony Mcauley, Sajal K. Das Mar 2002

Idmp-Based Fast Handoffs And Paging In Ip-Based 4g Mobile Networks, Archan Misra, Subir Das, Anthony Mcauley, Sajal K. Das

Research Collection School Of Computing and Information Systems

We consider the use of our previously proposed Intra-Domain Mobility Management Protocol (IDMP) in fourth-generation mobile networks. On evaluating the heterogeneous access technologies, cellular layouts, and application characteristics of 4G environments, we realize a need to reduce both handoff latency and the frequency of mobility-related signaling. We first present IDMP's fast intradomain handoff mechanism that uses a duration-limited proactive packet multicasting solution. We quantify the expected buffering requirements of our proposed multicasting scheme for typical 4G network characteristics and compare it with alternative IP-based fast handoff solutions. We also present a paging scheme under IDMP that replicates the current cellular …

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Endogenous Growth And The Manufacturing Revolution, Hing-Man Leung Mar 2002

Endogenous Growth And The Manufacturing Revolution, Hing-Man Leung

Research Collection School Of Economics

Manufacturing is undergoing a revolution. Teamwork, job-rotation, multitasking are superseding the Taylorist mode of organization. The skilled workforce, armed with automated machines, is gradually substituting and replacing the unskilled. At the same time the U.S. economy is experiencing record breaking growth. Is faster growth a consequence of this manufacturing revolution? We study this by inserting dynamic career choice into endogenous growth by human capital accumulation. The answer is affirmative: The gradual substitution of the unskilled by the skilled boosts the long-term growth trend. The model also explains worsening wage inequality between as well as within the skilled groups.

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Networked Growth, Hing-Man Leung Mar 2002

Networked Growth, Hing-Man Leung

Research Collection School Of Economics

This paper searches for a new growth engine in the new Info-Tech economy. IT-network effects are incorporated into Romer’s (1990) framework. Network effects support long-term steady state growth in per capita variables even without innovation, and growth rate increases with network externalities. Networked growth is sub-optimal, so should we break up an IT monopoly? To answer this we compare monopoly, Cournot and Bertrand set-ups. Cournot always ranks last socially, but Bertrand can be superior to monopoly if network effects are strong. When network interacts with Romer’s endogenous innovation, growth rate increases, probably by up to a percentage point per year.

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Plate Vibration Under Irregular Internal Supports, Yibao Zhao, G. W. Wei, Y. Xiang Mar 2002

Plate Vibration Under Irregular Internal Supports, Yibao Zhao, G. W. Wei, Y. Xiang

Research Collection Lee Kong Chian School Of Business

This paper studies the problem of plate vibration under complex and irregular internal support conditions. Such a problem has its widely spread industrial applications and has not been addressed in the literature yet, partially due to the numerical difficulties. A novel computational method, discrete singular convolution (DSC), is introduced for solving this problem. The DSC algorithm exhibits controllable accuracy for approximations and shows excellent flexibility in handling complex geometries, boundary conditions and internal support conditions. Convergence and comparison studies are carried out to check the validity and accuracy of the DSC method. Case studies are considered to the combination of …

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Mrpc: Maximizing Network Lifetime For Reliable Routing In Wireless Environments, Archan Misra, Suman Banerjee Mar 2002

Mrpc: Maximizing Network Lifetime For Reliable Routing In Wireless Environments, Archan Misra, Suman Banerjee

Research Collection School Of Computing and Information Systems

We propose MRPC, a new power-aware routing algorithm for energy-efficient routing that increases the operational lifetime of multi-hop wireless networks. In contrast to conventional power-aware algorithms, MRPC identifies the capacity of a node not just by its residual battery energy, but also by the expected energy spent in reliably forwarding a packet over a specific link. Such a formulation better captures scenarios where link transmission costs also depend on physical distances between nodes and the link error rates. Using a max-min formulation, MRPC selects the path that has the largest packet capacity at the 'critical' node (the one with the …

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B2b E-Commerce Revisited: Leading Perspectives On The Key Issues And Research Directions, Qizhi Dai, Robert J. Kauffman Mar 2002

B2b E-Commerce Revisited: Leading Perspectives On The Key Issues And Research Directions, Qizhi Dai, Robert J. Kauffman

Research Collection School Of Computing and Information Systems

The application of Internet technologies for the conduct of interfirm business transactions has given rise to a boom in business-to-business (B2B) electronic commerce. Yet, although there are many success stories that have been reported over the past several years, the progress of B2B e-commerce has been hindered by unanticipated technical, organizational, economic and legal challenges that diminish value. In this article, we report on a series of interviews with leading academic researchers and industry senior managers who are in a unique position to make sense of key issues and offer useful insights. The respondents provide their views on the efficacy …

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Smil Vs Mpeg-4 Bifs, Lai-Tee Cheok, Alexandros Eleftheriadis Feb 2002

Smil Vs Mpeg-4 Bifs, Lai-Tee Cheok, Alexandros Eleftheriadis

Research Collection School Of Computing and Information Systems

We present the results of a comparative analysis between the Synchronized Multimedia Integration Language (SMIL) and MPEG-4 BInary Format for Scenes (BIFS). SMIL is a language developed by the W3C consortium for expressing media synchronization among objects of various media types. MPEG-4 BIFS is the scene description scheme of MPEG-4, an international standard for communicating interactive audiovisual scenes. They are both facilities for representing and synchronizing multimedia content, and have a wide range of support for interactivity, animation and object composition features, etc. We compare their scope and purposes, the level of support for the multimedia features and investigate the …

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Endogenous Growth And Equilibrium Unemployment In A North-South Model Of The World Economy, Hian Teck Hoon Feb 2002

Endogenous Growth And Equilibrium Unemployment In A North-South Model Of The World Economy, Hian Teck Hoon

Research Collection School Of Economics

A North-South model is developed which incorporates an endogenous rate of equilibrium unemployment in the North in the context of long-run growth. It is shown how increases in the size of public debt and unemployment compensation financed by payroll taxation, all measured relative to productivity, raise the Northern natural rate of unemployment and, consequently, reduce the global rate of long-run growth. The effect of the shocks is also to drive down the rate of employment expansion in the South. A set of the fundamental determinants of the world terms of trade is obtained, which includes policy parameters.

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Singapore Management University Report To Stakeholders 2002 - 2003, Singapore Management University Jan 2002

Singapore Management University Report To Stakeholders 2002 - 2003, Singapore Management University

Report to Stakeholders

From a start-up institution with great expectations just three years ago, SMU has grown leaps and bounds. This past year was no exception, as we reached new heights while reaffirming the foundational vision of what we are – and want to be. A university with a rigorous curriculum and the right kind of academic and cultural environment for research, exploration and experimentation – where calculated risks can lead to ultimate success. A university full of dynamically talented students and academically outstanding faculty – interactive players in the process of education who make up SMU’s rich intellectual and personally diverse fabric. …

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Small And Medium Enterprises In Singapore And The New Economy, Boon Chye Lee, Wee Liang Tan Jan 2002

Small And Medium Enterprises In Singapore And The New Economy, Boon Chye Lee, Wee Liang Tan

Research Collection Lee Kong Chian School Of Business

From its earliest days as a British outpost, Singapore has relied heavily for its economic survival on its position as an entrepot trading centre. In the first decades after independence in 1965, economic strategy was focused on building infrastructure, attracting foreign direct investment, and export-led growth. The political commitment to openness in both trade and capital — and, more recently, labour — is one of the key features of a strategy that has delivered remarkable returns in terms of the economic well-being of the people of Singapore. Between 1961 and 1996 GDP per capita grew at an average rate of …

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Estimation Of The Stochastic Volatility Model By The Empirical Characteristic Function Method, J. Knight, S. Satchell, Jun Yu Jan 2002

Estimation Of The Stochastic Volatility Model By The Empirical Characteristic Function Method, J. Knight, S. Satchell, Jun Yu

Research Collection School Of Economics

The stochastic volatility model has no closed form for its likelihood and hence the maximum likelihood estimation method is difficult to implement. However, it can be shown that the model has a known characteristic function. As a consequence, the model is estimable via the empirical characteristic function. In this paper, the characteristic function of the model is derived and the estimation procedure is discussed. An application is considered for daily returns of Australian/New Zealand dollar exchange rate. Model checking suggests that the stochastic volatility model together with the empirical characteristic function estimates fit the data well.

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Component-Based Development Using Uml, L. Zhao, Keng Siau Jan 2002

Component-Based Development Using Uml, L. Zhao, Keng Siau

Research Collection School Of Computing and Information Systems

Component-based software development (CBD) is a potential breakthrough for software engineering. Unified Modeling Language (UML) can potentially facilitate CBD design and modeling. Although many research projects concentrate on the conceptual interrelation of UML and CBD, few incorporate actual component frameworks into the discussion, which is critical for real-world software system design and modeling. This paper reviews component-based development, including the use of UML for modeling CBD. The paper then discusses the means by which UML extension mechanisms can be used to better support the popular component framework -- CORBA. Two other important component frameworks, DCOM and Web Services, are also …

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Anatomy Of A Coupling Query In A Web Warehouse, Sourav S. Bhowmick, Sanjay Kumar Madria, Wee-Keong Ng, Ee Peng Lim Jan 2002

Anatomy Of A Coupling Query In A Web Warehouse, Sourav S. Bhowmick, Sanjay Kumar Madria, Wee-Keong Ng, Ee Peng Lim

Research Collection School Of Computing and Information Systems

To populate a data warehouse specifically designed for Web data, i.e. web warehouse, it is imperative to harness relevant documents from the Web. In this paper, we describe a query mechanism called coupling query to glean relevant Web data in the context of our web warehousing system called Warehouse Of Web Data (WHOWEDA). Coupling query may be used for querying both HTML and XML documents. Some of the important features of our query mechanism are ability to query metadata, content, internal and external (hyperlink) structure of Web documents based on partial knowledge, ability to express constraints on tag attributes and …

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Using Real Options Analysis For Evaluating Uncertain Investments In Information Technology: Insights From The Icis 2001 Debate, Paul P. Tallon, Robert J. Kauffman, Henry C. Lucas, Andrew B. Whinston, Kevin Zhu Jan 2002

Using Real Options Analysis For Evaluating Uncertain Investments In Information Technology: Insights From The Icis 2001 Debate, Paul P. Tallon, Robert J. Kauffman, Henry C. Lucas, Andrew B. Whinston, Kevin Zhu

Research Collection School Of Computing and Information Systems

Business and information systems (IS) executives continue to grapple with issues of risk and uncertainty in evaluating investments in information technology (IT). Despite the use of net present value (NPV) and other investment appraisal techniques, executives are often forced to rely on instinct when finalizing IT investment decisions. Recognizing the shortcomings of NPV, real options analysis has been suggested as an alternative approach, one that considers the risks associated with an investment while recognizing the ability of corporations to defer an investment until a later period or to make a partial investment instead. Responding to a growing interest in real …

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Empirical Characteristic Function In Time Series Estimation, J. Knight, Jun Yu Jan 2002

Empirical Characteristic Function In Time Series Estimation, J. Knight, Jun Yu

Research Collection School Of Economics

Policymakers seeking to design efficient and smoothly functioning pension systems for their aging workforces are beginning to acknowledge the key importance of administrative expenses when formulating rules for pension plan structure and fee disclosure requirements. This study explores the links between retirement plan offerings and pension expenses for a wide range of private and public sector pension plan types, using an invaluable new data set on two thousand Australian pension funds. Our analysis indicates how pension plan design can strongly influence plan expenses and consequently eventual retirement security.

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Monitoring Process Variability With Symmetric Control Limits, Zhenlin Yang Jan 2002

Monitoring Process Variability With Symmetric Control Limits, Zhenlin Yang

Research Collection School Of Economics

Control charts for monitoring process variability, such as the R-chart and S-chart, do not have symmetric probability limits as the distribution of the sample variability is not normal. Hence, the usual zone rules can not be applied although it is still desirable to be able to use the information from more than one point in decision making. In this paper, a modified S-chart based on an optimal normalizing transformation of the sample variance is first introduced. The new chart is shown to have approximate symmetric probability limits and hence can be interpreted in the same way as that of a …

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Change Leadership In Organizations: The Case Of Singapore's Small And Medium-Sized Enterprises, Thomas Menkhoff, Yue Wah Chay, Benjamin Loh Jan 2002

Change Leadership In Organizations: The Case Of Singapore's Small And Medium-Sized Enterprises, Thomas Menkhoff, Yue Wah Chay, Benjamin Loh

Research Collection Lee Kong Chian School Of Business

The essay is based on a survey of organizational change management practices in small and medium-sized enterprises (SMEs) in Singapore which was conducted by the authors between 1999 - 2001 in collaboration with the Singapore Chinese Chamber of Commerce & Industry (SCCCI). The study was aimed at examining the adaptability and change readiness of Singapore’s SMEs and their owners vis-à-vis the rapidly changing external business environment, as exemplified by the process of economic globalization, intense competition, technology development and the Asian crisis. A total of 101 companies responded to the survey which revealed some surprising facts about the adaptability and …

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Contract Law, Andrew Phang Jan 2002

Contract Law, Andrew Phang

Research Collection Yong Pung How School Of Law

As expected, the number of Singapore cases during the year under review impacting the law of contract is enormous. As I have mentioned in previous reviews, this is due to the fact that the law of contract permeates virtually all areas of the law of obligations – and, on occasion, beyond as well. I will therefore adopt the approach which has been adopted during previous years: which is to focus, in the main, on general principles. There have – as we shall see – been a few cases that are of especial significance. Not surprisingly, given the fact that the …

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Knowledge Management Mechanisms In E-Commerce: A Study Of Online Retailing And Auction Sites, Fiona Fui-Hoon Nah, Keng Siau, Yuhong Tian, Min Ling Jan 2002

Knowledge Management Mechanisms In E-Commerce: A Study Of Online Retailing And Auction Sites, Fiona Fui-Hoon Nah, Keng Siau, Yuhong Tian, Min Ling

Research Collection School Of Computing and Information Systems

Knowledge management is vital to a company's success in this e-commerce era. Not only has the topic of knowledge management attracted much research attention lately, but the management of customer knowledge is also becoming increasingly important. Despite its significance, few research studies have systematically investigated knowledge management in the e-commerce context. None of the studies we reviewed looked at how knowledge management mechanisms were employed in e-commerce. This research presents a comprehensive analysis of the knowledge management mechanisms employed by 14 e-commerce sites that were rated as being the best by Gomez.com, an independent Internet quality measurement firm. Specifically, we …

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Acceptable Internet Use Policy, Keng Siau, Fiona Fui-Hoon Nah, Limei Teng Jan 2002

Acceptable Internet Use Policy, Keng Siau, Fiona Fui-Hoon Nah, Limei Teng

Research Collection School Of Computing and Information Systems

Surveying use policies of three organizations--- educational institutions, ISPs, and non-ISPs.

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Community Banking In The E-Business Era, Peter Southard, Keng Siau Jan 2002

Community Banking In The E-Business Era, Peter Southard, Keng Siau

Research Collection School Of Computing and Information Systems

This paper reviews how existing and potential uses of Internet technology can generate a competitive advantage for rural community banks. To do so, it offers a framework for analyzing Internet technology investment decisions. Organizations in this segment of the banking industry are often more removed from centers of technology and have traditionally been more conservative in their approaches to information technology (among other things). Banking Associations have developed in the U.S., such as the Independent Bankers Association, to try and help community banks coordinate marketing, legislative, and other issues that they have in common. The use of Internet technology can …

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Enhancing Profiles For Anomaly Detection Using Time Granularities, Yingjiu Li, Ningning Wu, X. Sean Wang, Sushil Jajodia Jan 2002

Enhancing Profiles For Anomaly Detection Using Time Granularities, Yingjiu Li, Ningning Wu, X. Sean Wang, Sushil Jajodia

Research Collection School Of Computing and Information Systems

Recently, association rules have been used to generate profiles of normal behavior for anomaly detection. However, the time factor (especially in terms of multiple time granularities) has not been utilized extensively in generation of these profiles. In reality, user behavior during different time intervals may be very different. For example, the normal number and duration of FTP connections may vary from working hours to midnight, from business day to weekend or holiday. Furthermore, these variations may depend on the day of the month or the week. This paper proposes to build profiles using temporal association rules in terms of multiple …

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Management Research On Fashion: A Review And Evaluation, Timothy Adrian Robert Clark Dec 2001

Management Research On Fashion: A Review And Evaluation, Timothy Adrian Robert Clark

Research Collection Lee Kong Chian School Of Business

In recentyears there has been growing interest and debate amongst scholars with respectto the notion that management ideas are subject to recurrent swings in fashionin the same way that aesthetic aspects of life, such as clothing styles andmusical tastes, are characterized by surges of popularity and then decline. A numberof reasons for the increasing importance of management fashion as an area ofresearch have been identified. First, each wave of fashionable thinking inmanagement is seen as altering accepted definitions of the character of themodern organizational ideal with the consequence that few people who work inorganizations remain untouched by the consequence of …

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Discrete Singular Convolution For The Prediction Of High Frequency Vibration Of Plates, Yibao Zhao, G. W. Wei, Y. Xiang Dec 2001

Discrete Singular Convolution For The Prediction Of High Frequency Vibration Of Plates, Yibao Zhao, G. W. Wei, Y. Xiang

Research Collection Lee Kong Chian School Of Business

Theoretical analysis of high frequency vibrations is indispensable in a variety of engineering designs. Much effort has been made on this subject in the past few decades. However, there is no single technique which can be applied with confidence to various engineering structures for high frequency predictions at present. This paper introduces a novel computational approach, the discrete singular convolution (DSC) algorithm, for high frequency vibration analysis of plate structures. Square plates with six distinct boundary conditions are considered. To validate the proposed method, a completely independent approach, the Levy method, is employed to provide exact solutions for a comparison. …

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Factor Substitution And Endogenous Growth, Hing-Man Leung Dec 2001

Factor Substitution And Endogenous Growth, Hing-Man Leung

Research Collection School Of Economics

We argue that the degree of substitutability between skilled and unskilled workers in production increases long-term income growth rate. Growth rate reaches its maximum when such factors are perfect substitutes, but falls to zero when they are perfect complements. This model brings together the diverging relative wage and the human-capital-growth literature. Easier substitution absorbs more workers into the skilled profession, and their training fuels human capital accumulation and growth. Our result implies, among other things, that growth is positively related to between-and within-group inequality.

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Characteristics Of Erp Software Maintenance: A Multiple Case Study, Fiona Fui-Hoon Nah, Silvana Faja, Teuta Cata Dec 2001

Characteristics Of Erp Software Maintenance: A Multiple Case Study, Fiona Fui-Hoon Nah, Silvana Faja, Teuta Cata

Research Collection School Of Computing and Information Systems

A multiple case study approach was employed to identify maintenance activities pertaining to enterprise resource planning (ERP) implementation, classify them into maintenance categories, and assess their relative frequency at various stages of the ERP maintenance lifecycle. Five maintenance categories (corrective, adaptive, perfective, preventive, user support) were identified from a review of the literature on software maintenance. A new category pertaining to ‘communication, coordination and knowledge exchange with external parties’ and herein labeled ‘external parties’ is introduced to highlight the supporting role of external parties in ERP maintenance. This category includes reporting problems to vendors and consultants, tracking their progress towards …

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The Resource-Based View And Marketing: The Role Of Market-Based Assets In Gaining Competitive Advantage, Rajendra Kumar Srivastava, Liam Fahey, H. Kurt Christensen Dec 2001

The Resource-Based View And Marketing: The Role Of Market-Based Assets In Gaining Competitive Advantage, Rajendra Kumar Srivastava, Liam Fahey, H. Kurt Christensen

Research Collection Lee Kong Chian School Of Business

This article posits a framework that shows how market-based assets and capabilities are leveraged via market-facing or core business processes to deliver superior customer value and competitive advantages. These value elements and competitive advantages can be leveraged to result in superior corporate performance and shareholder value and reinvested to nurture market-based assets and capabilities in the future. The article also illustrates how resource-based view (RBV) and marketing considerations in the context of generating and sustaining customer value can refine and extend each other's traditional frames of analysis. Finally, the article posits a set of research directions designed to enable scholars …

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Automated Online News Classification With Personalization, Chee-Hong Chan, Aixin Sun, Ee Peng Lim Dec 2001

Automated Online News Classification With Personalization, Chee-Hong Chan, Aixin Sun, Ee Peng Lim

Research Collection School Of Computing and Information Systems

Classification of online news, in the past, has often been done manually. In our proposed Categorizor system, we have experimented an automated approach to classify online news using the Support Vector Machine (SVM). SVM has been shown to deliver good classification results when ample training documents are given. In our research, we have applied SVM to personalized classification of online news.

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