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Idmp-Based Fast Handoffs And Paging In Ip-Based Cellular Networks, Archan Misra, Subir Das, Ashutosh Dutta, Sajal K. Das May 2001

Idmp-Based Fast Handoffs And Paging In Ip-Based Cellular Networks, Archan Misra, Subir Das, Ashutosh Dutta, 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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Technology Transfer Into China: Preparing For A New Era, Arnoud De Meyer Apr 2001

Technology Transfer Into China: Preparing For A New Era, Arnoud De Meyer

Research Collection Lee Kong Chian School Of Business

Currently, there are three forces creating a more favourable background for western multinational companies to do new business in China by transferring new technology. First, growing overcapacity means China requires not traditional turnkey factories, but instead, technology which leads to innovation and improvement. Second, a changing attitude by all levels of Chinese government to demanding state-of-the-art technology including software instead of previous generation technology, and to technology management and commercial implementation more. Third, intellectual property rights are becoming better respected. The author makes suggestions to best manage technology transfer into China, with this changed background. Based on six case studies …

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Topic Detection, Tracking, And Trend Analysis Using Self-Organizing Neural Networks, Kanagasabai Rajaraman, Ah-Hwee Tan Apr 2001

Topic Detection, Tracking, And Trend Analysis Using Self-Organizing Neural Networks, Kanagasabai Rajaraman, Ah-Hwee Tan

Research Collection School Of Computing and Information Systems

We address the problem of Topic Detection and Tracking (TDT) and subsequently detecting trends from a stream of text documents. Formulating TDT as a clustering problem in a class of self-organizing neural networks, we propose an incremental clustering algorithm. On this setup we show how trends can be identified. Through experimental studies, we observe that our method enables discovering interesting trends that are deducible only from reading all relevant documents.

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Tcp Hack: Tcp Header Checksum Option To Improve Performance Over Lossy Links, Rajesh Krishna Balan, Boon Peng Lee, Renjish Kumar, Jacob Lillykutty, Winston Seah, A. L. Ananda Apr 2001

Tcp Hack: Tcp Header Checksum Option To Improve Performance Over Lossy Links, Rajesh Krishna Balan, Boon Peng Lee, Renjish Kumar, Jacob Lillykutty, Winston Seah, A. L. Ananda

Research Collection School Of Computing and Information Systems

Wireless networks have become increasingly common and an increasing number of devices are communicating with each other over lossy links. Unfortunately, TCP performs poorly over lossy links as it is unable to differentiate the loss due to packet corruption from that due to congestion. We present an extension to TCP which enables TCP to distinguish packet corruption from congestion in lossy environments resulting in improved performance. We refer to this extension as the HeAder ChecKsum option (HACK). We implemented our algorithm in the Linux kernel and performed various tests to determine its effectiveness. Our results have shown that HACK performs …

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Predictive Self-Organizing Networks For Text Categorization, Ah-Hwee Tan Apr 2001

Predictive Self-Organizing Networks For Text Categorization, Ah-Hwee Tan

Research Collection School Of Computing and Information Systems

This paper introduces a class of predictive self-organizing neural networks known as Adaptive Resonance Associative Map (ARAM) for classification of free-text documents. Whereas most sta- tistical approaches to text categorization derive classification knowledge based on training examples alone, ARAM performs supervised learn- ing and integrates user-defined classification knowledge in the form of IF-THEN rules. Through our experiments on the Reuters-21578 news database, we showed that ARAM performed reasonably well in mining categorization knowledge from sparse and high dimensional document feature space. In addition, ARAM predictive accuracy and learning efficiency can be improved by incorporating a set of rules derived from …

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A Note On The Paper “Resource-Constrained Project Scheduling: Notation, Classification, Models And Methods” By Brucker Et Al., Willy Herroelen, Erik Demeulemeester, Bert De Reyck Feb 2001

A Note On The Paper “Resource-Constrained Project Scheduling: Notation, Classification, Models And Methods” By Brucker Et Al., Willy Herroelen, Erik Demeulemeester, Bert De Reyck

Research Collection Lee Kong Chian School Of Business

The great variety of project scheduling problems studied in the ever growing literature motivated the recent development of classification schemes. In a recent paper (European Journal of Operational Research 112 (1999) 3–41), Brucker et al. make the claim that, so far, no classification scheme exists which is compatible with what is commonly accepted in machine scheduling and introduce a new classification. In this note, we critically review major shortcomings of the suggested scheme which place heavy limitations on its potential use.

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China And The Globalization Of Ir Theory: Discussion Of 'Building International Relations Theory With Chinese Characteristics', William A. Callahan Feb 2001

China And The Globalization Of Ir Theory: Discussion Of 'Building International Relations Theory With Chinese Characteristics', William A. Callahan

Research Collection School of Social Sciences

This essay examines current developments in International Relations theory in China. First it comments on Song Xinning's essay, agreeing that IR theory in China is limited by ideology, the dominance of policy-oriented research, and the state. But rather than seeing culture ('IR theory with Chinese characteristics') as a problem that can be solved by a more scientific approach to IR theory, the essay argues that the scientism of realism and IPE has similar problems. Thus the essay switches from the universals of science to the contingency of interpretation to understand global politics, drawing on recent books which combine IPE with …

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A Framework For Performance And Value Assessment Of E-Business Systems In Corporate Travel Distribution, A.M. Chircu, Robert J. Kauffman Jan 2001

A Framework For Performance And Value Assessment Of E-Business Systems In Corporate Travel Distribution, A.M. Chircu, Robert J. Kauffman

Research Collection School Of Computing and Information Systems

This chapter proposes and illustrates a framework that the authors call the value life cycle for e-commerce systems. Based on recent research results that relate to technology investments in the corporate travel industry and related theoretical and empirical perspectives, the authors lay out the corporate travel e-commerce system solutions value life cycle. The perspective involves estimating the maximum value that that an organization can obtain by implementing an e-commerce system in a specific industry and competitive environment. It also considers multiple factors that act as value contingencies for the implementation process. These create barriers to value accrual and to …

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Unified Modeling Language: A Complexity Analysis, Keng Siau, Q. Cao Jan 2001

Unified Modeling Language: A Complexity Analysis, Keng Siau, Q. Cao

Research Collection School Of Computing and Information Systems

Unified Modeling Language (UML) is the standard visual modeling language for Object Oriented (OO) systems development, but it has been criticized for its complexity, inconsistent semantics, and ambiguous constructs. A set of complexity indices for UML and the nine diagramming techniques in UML was compiled recently. The complexity analysis is formulated based on the number of constructs, associations, roles, and so forth, in a modeling method. We argue that this set of metrics provides an indication of the theoretical complexity of the modeling methods. On the other hand, the theoretical complexity of the modeling methods does not necessarily relate to …

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Kindness In Cyberspace? The Sharing Of Valuable Goods Online, Sheen S. Levine Jan 2001

Kindness In Cyberspace? The Sharing Of Valuable Goods Online, Sheen S. Levine

Research Collection Lee Kong Chian School Of Business

No abstract provided.

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Organizational Attractiveness For Prospective Applicants: A Person-Organisation Fit Perspective, Filip Lievens, Christoph Decaesteker, Pol Coetsier, Jo Geimaert Jan 2001

Organizational Attractiveness For Prospective Applicants: A Person-Organisation Fit Perspective, Filip Lievens, Christoph Decaesteker, Pol Coetsier, Jo Geimaert

Research Collection Lee Kong Chian School Of Business

This study investigates which of four objective organisational characteristics determine the attractiveness of organisations for prospective applicants and the degree to which the Big Five personality factors moderate the effects of some of these organisational attributes. To this end, 359 final-year students (engineering and business majors, 71% men, mean age = 22.4 years) read short descriptions of organisations. These descriptions varied on four organisational characteristics (i.e. organisation size, level of internationalisation, pay mix, and level of centralisation). The students had to indicate their attraction to the organisation. Additionally, they provided self-ratings on a personality inventory. The results show that prospective …

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Simulation Methodologies For Political Scientists, Kenneth Benoit Jan 2001

Simulation Methodologies For Political Scientists, Kenneth Benoit

Research Collection School of Social Sciences

In this brief article I identify and characterize the variety of simulation methodologies relevant to political science research. Having identified them, I then recount a light-hearted tale of one successful application of a computer simulation to a real world problem of enormous significance. Extending the discussion to other examples, I discuss some of the main issues and benefits in simulation models for political science. Finally, I identify some software tools and additional resources for those who would like to learn more about using simulation methods for their own work.

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Education And Citizenship In Diverse Societies, Chandran Kukathas Jan 2001

Education And Citizenship In Diverse Societies, Chandran Kukathas

Research Collection School of Social Sciences

The question of the state's role in the control of sponsorship of education is addressed in the light of liberal political principles designed to keep peace and enforce toleration in culturally diverse societies. Some contemporary, self-described liberal philosophers argue for a much more substantial educational role for the state than liberal principles will really allow. Brian Barry's argument for that role assumes that the state can prescribe answers to controversial questions regarding the truth and the good life in which a truly liberal state would take no interest. Stephen Macedo is more accommodating to religious diversity than Barry, but his …

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The Asian Economic Crisis: The Way Ahead For Singapore, Augustine H. H. Tan Jan 2001

The Asian Economic Crisis: The Way Ahead For Singapore, Augustine H. H. Tan

Research Collection School Of Economics

No abstract provided.

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Ontologies And Electronic Commerce, Dieter Fensel, Deborah L. Mcguinness, Ellen Schulten, Wee-Keong Ng, Ee Peng Lim, Guanghao Yan Jan 2001

Ontologies And Electronic Commerce, Dieter Fensel, Deborah L. Mcguinness, Ellen Schulten, Wee-Keong Ng, Ee Peng Lim, Guanghao Yan

Research Collection School Of Computing and Information Systems

Ontologies are the first step toward realizing the full power of online e-commerce. Ontologies enable machine-understandable semantics of data, and building this data infrastructure will enable completely new kinds of automated services. Software agents can search for products, form buyer and seller coalitions, negotiate about products, or help automatically configure products and services according to specified user requirements. The combination of machine-processable semantics of data based on ontologies and the development of many specialized reasoning services will bring the Web to its full power. The authors discuss: taxonomies; information sources; future issues; business viewpoints; the e-marketplace; and B2B e-commerce standardisation …

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Pricing Options Using Implied Trees, Kian Guan Lim, Da Zhi Jan 2001

Pricing Options Using Implied Trees, Kian Guan Lim, Da Zhi

Research Collection Lee Kong Chian School Of Business

No abstract provided.

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Information And Communication Technology And Poverty: An Asian Perspective, M. G. Quibria, Feichin, Ted Tschang Jan 2001

Information And Communication Technology And Poverty: An Asian Perspective, M. G. Quibria, Feichin, Ted Tschang

Research Collection Lee Kong Chian School Of Business

Many commentators have extolled the virtues of new information and communication technologies (ICTs) in reducing poverty and improving the quality of life. While such arguments have been used before in relation to many predecessor technologies, including other earlier communications technologies, the promise has often floundered. This paper attempts to provide a more balanced analysis of the question, by exploring the linkages between the new ICTs and poverty reduction. It examines the linkages in two ways: the potential for direct impacts of ICTs on various areas of poverty and development, and the indirect impacts of ICTs on economic growth, exports and …

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Collaborative Model And Algorithms For Supporting Real-Time Distribution Logistics Systems, Hoong Chuin Lau, Qi Zhang Liu Dec 2000

Collaborative Model And Algorithms For Supporting Real-Time Distribution Logistics Systems, Hoong Chuin Lau, Qi Zhang Liu

Research Collection School Of Computing and Information Systems

We study a complex optimization problem that arises due to an emerging trend in distribution logistics. The problem involves the integration of an inventory management problem and the vehicle routing problem with time windows, both of which are known to be NP-hard. We describe a collaborative approach to solve this problem in real-time. The novelty of our approach lies in the tight algorithmic integration between two sub-problems, and suggests an elegant scheme to deal with other integrated optimization problems of the same nature. For first sub-problem, we will present two algorithms: a complete mathematical model integrating integer programming with constraint …

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Knowledge Discovery As An Aid To Organizational Creativity, Keng Siau Dec 2000

Knowledge Discovery As An Aid To Organizational Creativity, Keng Siau

Research Collection School Of Computing and Information Systems

Computers can play an important role in the creative process. With the abundance of data and increasing speed of computers, creativity can now be stimulated and enhanced with knowledge mined from available data. The process is known as knowledge discovery or data mining. Knowledge discovery is the process of discovering interesting associations among data in the database. Users in the creativity process can feed on the discovered associations to generate creative solutions. The objective of this paper is to present knowledge discovery as an aid to creativity. The paper first presents the concept of knowledge discovery and then discusses the …

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Generalized Tcp Congestion Avoidance And Its Effect On Bandwidth Sharing And Variability, Archan Misra, John Baras, Teunis Ott Dec 2000

Generalized Tcp Congestion Avoidance And Its Effect On Bandwidth Sharing And Variability, Archan Misra, John Baras, Teunis Ott

Research Collection School Of Computing and Information Systems

To model possible suggested changes in TCP window adaptation in response to randomized feedback, such as ECN (explicit congestion notification), we formulate a generalized version of the TCP congestion avoidance algorithm. We first consider multiple such generalized TCP flows sharing a bottleneck buffer under the assured service model and use a fixed point technique to obtain the mean window sizes and throughputs for the TCP flows, To further study how changes in the adaptation algorithm affect the variability in the throughput, we use an analytical-cum-numerical technique to derive the window distribution (and related statistics) of a single generalized flow under …

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Confucian Ethics And The Critique Of Ideology, Alan Kam Leung Chan Dec 2000

Confucian Ethics And The Critique Of Ideology, Alan Kam Leung Chan

Research Collection College of Integrative Studies

The debate between Hans-Georg Gadamer and Jürgen Habermas provides a fresh perspective from which Confucian philosophy may be approached. In this paper, focusing on the Lunyu (Analects), I argue that the sayings of Confucius reflect an essentially 'conservative' orientation, finding in tradition a reservoir of insight and truth. There is a critical dimension to it in that ethical reflection and self-cultivation would enable the individual to challenge particular claims of tradition. However, can self-cultivation transcend tradition as a whole and enable the individual to effect radical change? Following the strategy of Habermas' critique of Gadamer, what happens if tradition is …

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Cultural Policy In Singapore: Negotiating Economic And Socio-Cultural Agendas, Lily Kong Nov 2000

Cultural Policy In Singapore: Negotiating Economic And Socio-Cultural Agendas, Lily Kong

Research Collection School of Social Sciences

In this paper, I examine the role of cultural policy in a newly industrialised economy, which is at the same time a state with a short history and only nascent beginnings in nation-building and efforts to construct a distinctive cultural identity. Using Singapore as the site of analyses, develop an understanding of the intersection between the economic and socio-cultural agendas behind cultural development policies. I illustrate the hegemony of the economic, supported by the ideology and language of pragmatism and globalisation. At the same time, I explore the reception of and attempts to negotiate (and at times, contest) state policies …

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Extensible Mpeg-4 Textual Format (Xmt), Michelle Kim, Steve Wood, Lai-Tee Cheok Nov 2000

Extensible Mpeg-4 Textual Format (Xmt), Michelle Kim, Steve Wood, Lai-Tee Cheok

Research Collection School Of Computing and Information Systems

This paper describes the Extensible MPEG-4 Textual format (XMT), a framework for representing MPEG-4 scene description using a textual syntax. The XMT allows the content authors to exchange their content with other authors, tools or service providers, and facilitates interoperability with both the X3D, developed by the Web3D consortium, and the Synchronized Multimedia Integration Language (SM1L) from the W3C consortium.

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Using 'Drop-Biasing' To Stabilize The Occupancy Of Random-Drop Queues With Tcp Traffic, Archan Misra, Teunis Ott, John Baras Nov 2000

Using 'Drop-Biasing' To Stabilize The Occupancy Of Random-Drop Queues With Tcp Traffic, Archan Misra, Teunis Ott, John Baras

Research Collection School Of Computing and Information Systems

The paper describes how the use of ‘drop-biasing’, a technique to control the distribution of the gap between consecutive packet losses in random drop queues (such as RED) can be used to reduce the variability of the queue occupancy with TCP traffic. Reducing the variance of the queue occupancy reduces delay jitter for buffered packets, as well as decreases the likelihood of buffer underflow. We find that modifying the packet drop probabilities to ensure a minimum separation between consecutive packet drops serves to decrease the variability in the queue occupancy. This is really achieved as a result of the increased …

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A Meta-Analysis On Relationship Modeling Accuracy: Comparing Relational And Semantic Models, Qing Cao, Fiona Fui-Hoon Nah, Keng Siau Aug 2000

A Meta-Analysis On Relationship Modeling Accuracy: Comparing Relational And Semantic Models, Qing Cao, Fiona Fui-Hoon Nah, Keng Siau

Research Collection School Of Computing and Information Systems

Semantic data modeling, such as entity-relationship (ER) modeling and extended/enhanced entity-relationship (EER) modeling, has emerged as an alternative to relational data modeling. The majority of research in data modeling suggests that the use of semantic data models leads to better performance. However the findings are not conclusive and sometimes inconsistent. In this research, we investigate modeling relationship correctness in relational and semantic models. The meta-analysis carried out in this research is an attempt to alleviate inconsistent results in previous studies.

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E-Commerce Systems: Architecture, Infrastructure, Model, And Development Methodology, A. Bajaj, Keng Siau Aug 2000

E-Commerce Systems: Architecture, Infrastructure, Model, And Development Methodology, A. Bajaj, Keng Siau

Research Collection School Of Computing and Information Systems

The last decade has seen tremendous growth in the world wide web (WWW) (Berners-Lee, Caillau, Luotonen, Nielsen, & Secret, 1994) and e-commerce, which now offers organizations and consumers a unique channel to deliver and purchase goods and services. E-commerce is popularly classified as B2B (business to business), B2C (business to consumer) and C2C (consumer to consumer). B2B e-commerce, which is currently the fastest growing segment of e-commerce (Fellenstein & Wood, 2000), consists of making more efficient the flow of goods and services across organizations. This efficiency is typically increased using standards for electronic data exchange, automating certain processes across organizations …

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Injunctions Restraining Calls On Performance Bonds: Is Fraud The Only Ground In Singapore?, Quentin Loh, Hang Wu Tang Aug 2000

Injunctions Restraining Calls On Performance Bonds: Is Fraud The Only Ground In Singapore?, Quentin Loh, Hang Wu Tang

Research Collection Yong Pung How School Of Law

This paper traces the divergence of Singapore law from English law with regard to the grounds upon which a call on a performance bond can be restrained, in particular the recent recognition of the Singapore Court of Appeal's ruling that "unconscionability" is a separate ground to restrain the call of a performance bond. This article examines the legal nature of an on demand performance bond and seeks to challenge the assumption that a performance bond is a mirror image of a letter of credit. This paper also discusses the recent case of Cargill International v. Bangladesh Sugar and Food Industries …

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Telemip: Telecommunications-Enhanced Mobile Ip Architecture For Fast Intradomain Mobility, Subir Das, Archan Misra, Prathima Agrawal, Sajal K. Das Aug 2000

Telemip: Telecommunications-Enhanced Mobile Ip Architecture For Fast Intradomain Mobility, Subir Das, Archan Misra, Prathima Agrawal, Sajal K. Das

Research Collection School Of Computing and Information Systems

This article first surveys existing protocols for supporting IP mobility and then proposes an extension to the mobile IP architecture, called TeleMIP. Our architecture attempts to achieve smaller handoff latency by localizing the scope of most location update messages within an administrative domain or a geographical region. TeleMIP is intended for use in evolving third-generation wireless networks, and introduces a new logical entity, called the mobility agent, which provides a mobile node with a stable point of attachment in a foreign network. While the MA is functionally similar to conventional foreign agents, it is located at a higher level in …

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Achieving Growth Through Corporate Partnerships And Joint Ventures: Will Singapore's Strategic Leap Into The Region Work?, Ravinder K. Zutshi, Wee Liang Tan Jun 2000

Achieving Growth Through Corporate Partnerships And Joint Ventures: Will Singapore's Strategic Leap Into The Region Work?, Ravinder K. Zutshi, Wee Liang Tan

Research Collection Lee Kong Chian School Of Business

One of the characteristic features of the East Asian economic development strategy has been the interventionist role of the government in the economic sphere (Amsden 1989; Kwon 1994; Wade 1990; Zutshi and Gibbons 1998). Governments in East Asia have traditionally, worked closely with the private sector. As a result unique business systems embedded in networks and alliances have evolved in countries like Taiwan, Japan, Korea and Singapore (Hamilton and Biggard 1988). Singapore has attempted to extend this model of strategic cooperation beyond its borders into the region. Schein (1996) identifies a number of major development eras in the evolution of …

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From Selling Peanuts And Beer In Yankee Stadium To Creating A Theory Of Transformational Leadership: An Interview With Bernie Bass, Robert Hooijberg, Jaepil Choi Jun 2000

From Selling Peanuts And Beer In Yankee Stadium To Creating A Theory Of Transformational Leadership: An Interview With Bernie Bass, Robert Hooijberg, Jaepil Choi

Research Collection Lee Kong Chian School Of Business

This issue's interview is with Bernard Bass. He started in academia in 1946 and began teaching 52 years ago. When he publishes in the year 2000, he will have published in seven different decades. Besides all of his work in the area of leadership, Dr. Bass is also the co-founder (with Bob House and Henry Tosi) of The Leadership Quarterly.

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