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Energy Efficiency And Capacity For Tcp Traffic In Multi-Hop Wireless Networks, Sorav Bansal, Rajeev Shorey, Rajeev Gupta, Archan Misra Feb 2006

Energy Efficiency And Capacity For Tcp Traffic In Multi-Hop Wireless Networks, Sorav Bansal, Rajeev Shorey, Rajeev Gupta, Archan Misra

Research Collection School Of Computing and Information Systems

We study the performance metrics associated with TCP-regulated traffic in multi-hop, wireless networks that use a common physical channel (e.g., IEEE 802.11). In contrast to earlier analyses, we focus simultaneously on two key operating metrics—the energy efficiency and the transport-layer (TCP) throughput. Using analysis and simulations, we show how these metrics are strongly influenced by the radio transmission range of individual nodes. Due to tradeoffs between the individual packet transmission energy and the likelihood of retransmissions, the total energy consumption is a convex function of the number of hops (and hence, of the transmission range). On the other hand, the …

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Design Synthesis From Interaction And State-Based Specifications, Jun Sun, Jin Song Dong Jan 2006

Design Synthesis From Interaction And State-Based Specifications, Jun Sun, Jin Song Dong

Research Collection School Of Computing and Information Systems

Interaction-based and state-based modeling are two complementary approaches of behavior modeling. The former focuses on global interactions between system components. The latter concentrates on the internal states of individual components. Both approaches have been proven useful in practice. One challenging and important research objective is to combine the modeling power of both effectively and then use the combination as the basis for automatic design synthesis. We present a combination of interaction-based and state-based modeling, namely, Live Sequence Charts and Z, for system specification. We then propose a way of generating distributed design from the combinations. Our approach handles systems with …

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Singapore Management University Report To Stakeholders 2006 - 2007, Singapore Management University Jan 2006

Singapore Management University Report To Stakeholders 2006 - 2007, Singapore Management University

Report to Stakeholders

SMU was founded to add diversity to higher education in Singapore, and to serve as a catalyst for change. Eight years on, the University continues to set new benchmarks for nurturing responsible leadership, developing diverse talents and spearheading research that has impact and real-world relevance. In the past academic year, SMU added a new school, graduate programmes and centres of excellence and forged new and deeper relationships with industry, academic and civic partners. These advances built on our existing strengths and moved us forward on a path of purposeful change and growth that reinforced our vision to be a premier …

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Singapore Management University Celebrates Official Opening Of City Campus – Singapore's First And Only City Campus, Smu Ushers In A Newera, Singapore Management University Jan 2006

Singapore Management University Celebrates Official Opening Of City Campus – Singapore's First And Only City Campus, Smu Ushers In A Newera, Singapore Management University

SMU Press Releases and News

No abstract provided.

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The Role Of European Governments In The Digital Economy, Arnoud Cyriel Leo De Meyer Jan 2006

The Role Of European Governments In The Digital Economy, Arnoud Cyriel Leo De Meyer

Research Collection Lee Kong Chian School Of Business

What is the role of government in the digital economy? It is not our intention to go into an in-depth ideological debate on whether governments should intervene in the business sector. We will try to adopt a pragmatic approach and explore what already happens in practice. It is up to the reader to make a judgment to what extent the governments should be involved in the ICT sector. There is enough indication that, due to network externality effects, governments need to take on an active role in stimulating an e-environment to jump-start the move toward a higher level of e-readiness.In …

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International Situational Judgment Tests, Filip Lievens Jan 2006

International Situational Judgment Tests, Filip Lievens

Research Collection Lee Kong Chian School Of Business

The above item was given in the late 1930s to German employees to measure something else other than cognitive ability (e.g., planning and organizing). It illustrates that situational judgment tests (SJTs) have been used outside the United States for quite sometime. Early international applications of SJTs can also be found in the so-called cultural assimilators in cross-cultural training programs (Bhawuk&Brislin,2000). In these cultural assimilators, future expatriates are presented with written situations of an expatriate interacting with a host national and are asked to indicate the most effective response alternative.

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Conflicts Of Interest And Stock Recommendations: The Effects Of The Global Settlement And Related Regulations, Rong Wang, Ohad Kadan, Leonardo Madureira, Tzachi Zach Jan 2006

Conflicts Of Interest And Stock Recommendations: The Effects Of The Global Settlement And Related Regulations, Rong Wang, Ohad Kadan, Leonardo Madureira, Tzachi Zach

Research Collection Lee Kong Chian School Of Business

Prior research has shown that sell-side analysts in general, and especially those facing conflicts of interest driven by investment bank relationships, issue overly optimistic recommendations. This paper studies the effect of regulations on sell-side analysts’ research. These regulations — Rule NASD 2711, Rule NYSE 472, and the “Global Analyst Research Settlement” — attempted to mitigate the interdependence between the research and the investment bank departments of US brokerage houses. The results suggest that the regulations have partially achieved their goal of curbing the conflicts of interest’s influence over analysts’ stock recommendations. After the adoption of the new regulations, the likelihood …

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Encouraging Knowledge Sharing In Knowledge-Based Organizations: Individual And Organizational Aspects Of Knowledge Management Leadership, Thomas Menkhoff, Yue Wah Chay, Benjamin Loh, Hans-Dieter Evers Jan 2006

Encouraging Knowledge Sharing In Knowledge-Based Organizations: Individual And Organizational Aspects Of Knowledge Management Leadership, Thomas Menkhoff, Yue Wah Chay, Benjamin Loh, Hans-Dieter Evers

Research Collection Lee Kong Chian School Of Business

This study aims to understand the antecedents of knowledge sharing behavior amongst tenant firms in Science and Technology Parks (STPs) which has been highlighted as a key factor for the development of an epistemic culture of innovation in STPs. Components of a model of knowledge management leadership with a focus on knowledge sharing and innovative value creation in STPs are developed inspired by the work of Nonaka, Nahapiet and Ghoshal, Guns and others. Collection of data on various relevant measures is ongoing, covering technology firms and STPs in Singapore and other Asian countries. Besides outlining model components and hypotheses, tentative …

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Monolithic Integration Of Collimating Fresnel Lens For Beam Quality Enhancement In Tapered High Power Laser Diode, F. K. Lau, Chyng Wen Tee, X. Zhao, K. A. Williams, R. V. Penty, I. H. White, M. Calligaro, M. Lecomte, O. Parillaud, N. Michel, M. Krakowski Jan 2006

Monolithic Integration Of Collimating Fresnel Lens For Beam Quality Enhancement In Tapered High Power Laser Diode, F. K. Lau, Chyng Wen Tee, X. Zhao, K. A. Williams, R. V. Penty, I. H. White, M. Calligaro, M. Lecomte, O. Parillaud, N. Michel, M. Krakowski

Research Collection Lee Kong Chian School Of Business

We demonstrate, for the first time, a monolithic integrated lens for wide aperture gain-guided tapered laser beam quality enhancement by compensating the quadratic phase curvature. The 3mm long tapered laser with an output aperture of 170μm adopted in this design consists of a gain-guided tapered section and an index-guided ridge section and operated at 980nm. The lens design is implemented by focus ion beam etching (FIBE) technique, whereby the laser diode is mounted p-side up in order to facilitate the etching process. The lens is located 600μm away from the junction of the tapered and ridge sections, and is 40μm …

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Fabrication-Tolerant Active-Passive Integration Scheme For Vertically-Coupled Microring Resonators, Chyng Wen Tee, Ka Williams, Rv Penty, Ih White Jan 2006

Fabrication-Tolerant Active-Passive Integration Scheme For Vertically-Coupled Microring Resonators, Chyng Wen Tee, Ka Williams, Rv Penty, Ih White

Research Collection Lee Kong Chian School Of Business

The large-scale photonic integration of microring resonators in three dimensions made possible by recent developments in vertical coupling and wafer bonding technology is shown to be sensitive to lateral mask misalignment for the ring and bus waveguides introduced during the fabrication process. For a typical 20-μm radius, vertically coupled microring calculations reveal a linear relationship between deviation in the coupling coefficient and lateral misalignment. A coupling coefficient reduction of 50% is predicted for a lateral misalignment of 0.3 μm, which is typical for an alignment accuracy limited by the current state-of-the-art mask alignment process. The use of a wide multimode …

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Social In Social Entrepreneurship: Altruism And Entrepreneurship, Partners In Social Entrepreneurship, Wee Liang Tan, John Joseph Williams, Teck Meng Tan Jan 2006

Social In Social Entrepreneurship: Altruism And Entrepreneurship, Partners In Social Entrepreneurship, Wee Liang Tan, John Joseph Williams, Teck Meng Tan

Research Collection Lee Kong Chian School Of Business

No abstract provided.

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Conceptualization Of Trust, Commitment, And Understanding The Relationships Between Trust, Commitment, And Willingness To Try Internet Banking Services, Siew Tong Fock, Hian Chye Koh Jan 2006

Conceptualization Of Trust, Commitment, And Understanding The Relationships Between Trust, Commitment, And Willingness To Try Internet Banking Services, Siew Tong Fock, Hian Chye Koh

Research Collection Lee Kong Chian School Of Business

This paper examines trust and commitment and their antecedents and consequences within the context of Internet banking, based on data collected from a survey of 500 Singapore undergraduates. After the establishment of a conceptual model that links trust and commitment to the willingness to try Internet banking, the empirical findings show that higher levels of trust and commitment are significantly associated with a greater willingness to try Internet banking. The paper also investigates security, ethics, privacy, openness, the speed of response, quality of information, regulatory control, technology advancement, and reputation as determinants of trust. Of these, security, regulatory control, technology …

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Impact Of Gender And Ethnic Composition Of South African Boards Of Directors On Intellectual Capital Performance, Jean-Luc Wolfgang Mitchell Van Der Zahn Jan 2006

Impact Of Gender And Ethnic Composition Of South African Boards Of Directors On Intellectual Capital Performance, Jean-Luc Wolfgang Mitchell Van Der Zahn

Research Collection School Of Accountancy

This study examines the association between the gender and ethnic composition of boards of directors and firm performance in a transitional nation. In contrast to prior research that largely focuses on firm performance within a financial context, this study concentrates on intellectual capital performance. Using data collected from 84 South African, empirical results indicate a positive association between the percentage of female and non-white directors on the board and a firm’s intellectual capital performance. Additional analysis shows the designation of female directors as an insider has a negative effect of intellectual capital performance. Designation of female and non-white directors as …

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The Roles Of Digital Libraries In Teaching And Learning Geography, Chew-Hung Chang, John Hedberg, Tiong-Sa Teh, Ee Peng Lim Jan 2006

The Roles Of Digital Libraries In Teaching And Learning Geography, Chew-Hung Chang, John Hedberg, Tiong-Sa Teh, Ee Peng Lim

Research Collection School Of Computing and Information Systems

Adopting a problem-centred approach helps students to learn Geography more effectively as they are able to identify and generalize about where different resources or activities are spatially located and they learn to associate certain patterns and processes with geographical changes. In an era where web-based student-centred inquiry is gaining popularity as a mode of learning Geography, the role of digital libraries as delivery trucks (in Clark’s terminology, 1983) needs to be better understood. An obvious affordance of the digital library is that it organizes information around themes for problems to be solved. This paper describes a developmental project to build …

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Advances In Data Modeling Research, G. Allen, A. Bajaj, V. Khatri, S. Ram, Keng Siau Jan 2006

Advances In Data Modeling Research, G. Allen, A. Bajaj, V. Khatri, S. Ram, Keng Siau

Research Collection School Of Computing and Information Systems

In this paper, we summarize the discussions of the panel on "Advances in Data Modeling Research," held at the Americas Conference on Information Systems (AMCIS) in 2005. We focus on four primary areas where data modeling research offers rich opportunities: spatio-temporal semantics, genome research, ontological analysis and empirical evaluation of existing models. We highlight past work in each area and also discuss open questions, with a view to promoting future research in the overall data modeling area.

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Using Social Development Lenses To Understand E-Government Development, Keng Siau, Y. Long Jan 2006

Using Social Development Lenses To Understand E-Government Development, Keng Siau, Y. Long

Research Collection School Of Computing and Information Systems

As governments at different levels and all around the world are increasingly using the Web to enhance and improve their services, understanding e-government development and exploring factors that affect e-government development have become important research topics. The purpose of this research is to investigate factors explaining e-government development in terms of social development lenses. Based on growth and regional development theories, the paper hypothesizes that income level, development status, and region are three factors that differentiate e- government development in countries. Group comparison tests are conducted using secondary data from the United Nations and the United Nations Development Programme. The …

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Using Cognitive Mapping Techniques To Supplement Uml And Up In Information Requirements Determination, Keng Siau, Tan Xin Jan 2006

Using Cognitive Mapping Techniques To Supplement Uml And Up In Information Requirements Determination, Keng Siau, Tan Xin

Research Collection School Of Computing and Information Systems

Information requirements determination is a critical task in system development projects. Many human issues may hinder the efforts to accurately capture and clearly understand users' information requirements. In this paper, we review the cognitive underpinnings of some human issues, which are discussed in existing literature and relevant to information requirements determination. We then propose the use of cognitive mapping techniques in the process of information requirements determination. Three widely used cognitive mapping techniques - causal mapping, semantic mapping, and concept mapping – are briefly introduced in this article. A case is used to illustrate how to use these cognitive mapping …

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E-Healthcare In Abc County Health Department (Abcchd): Trade-Offs Analysis And Evaluation, Keng Siau, Hwee-Joo Kam Jan 2006

E-Healthcare In Abc County Health Department (Abcchd): Trade-Offs Analysis And Evaluation, Keng Siau, Hwee-Joo Kam

Research Collection School Of Computing and Information Systems

The issue of privacy stirred a tumultuous uproar when the ABC County Health Department (ABCCHD) was planning for an e-Healthcare system that utilized information technology to streamline the administration process of patients. ABCCHD had hired a software vendor, Info-Health, a company that specialized in information system development for the healthcare industry to help in the project. The privacy of patients with Sexually Transmitted Diseases/Human Immunity System was a thorny issue in the implementation of the e-Healthcare system. A trade-off between privacy and cost was discussed and debated. Three alternatives, with varying degrees of privacy and cost, were considered.

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External Debt And Growth Dynamics, Si Chen Jan 2006

External Debt And Growth Dynamics, Si Chen

Dissertations and Theses Collection (Open Access)

Based on an extended growth model, this thesis further explores the joint dynamics between external debt and growth. The model explicitly expresses this growth dynamic mechanism incorporating external debt as an important explanatory variable with risk premium and other related structural factors. The interactions between external debt and growth are interpreted as directly and mainly through the channel of capital accumulation and indirectly through technology change. These constitute the functional form foundation to solve the main concern on the effect of external debt upon growth adjustment path. The numerical simulations of the model indicate that when external debt is assumed …

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A Class Of Nonlinear Stochastic Volatility Models, Jun Yu, Zhenlin Yang Jan 2006

A Class Of Nonlinear Stochastic Volatility Models, Jun Yu, Zhenlin Yang

Research Collection School Of Economics

This paper proposes a class of nonlinear stochastic volatility models based on the Box-Cox transformation which offers an alternative to the one introduced in Andersen (1994). The proposed class encompasses many parametric stochastic volatility models that have appeared in the literature, including the well known lognormal stochastic volatility model, and has an advantage in the ease with which different specifications on stochastic volatility can be tested. In addition, the functional form of transformation which induces marginal normality of volatility is obtained as a byproduct of this general way of modeling stochastic volatility. The efficient method of moments approach is used …

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Realized Variance And Market Microstructure Noise - Comment, Peter C. B. Phillips, Jun Yu Jan 2006

Realized Variance And Market Microstructure Noise - Comment, Peter C. B. Phillips, Jun Yu

Research Collection School Of Economics

No abstract provided.

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Financial Liberalization In A Small Open Economy, Haiping Zhang, Jürgen Von Hagen Jan 2006

Financial Liberalization In A Small Open Economy, Haiping Zhang, Jürgen Von Hagen

Research Collection School Of Economics

We address three related questions concerning financial liberalization in a small open economy. Does financial liberalization and the resulting capital inflow improve production efficiency in the domestic economy? Who benefits from financial liberalization in the long run and in the short run? Should financial liberalization be implemented gradually or hastily? Our main results are as follows. First, whether financial deregulation in one sector can improve production efficiency may depend on financial regulation in other sectors. Second, financial liberalization may have opposite welfare implications to domestic agents with different productivity in the long run. Third, although some domestic agents lose in …

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A Survey On Physical Delivery Versus Cash Settlement In Futures Contracts, Donald Lien, Yiu Kuen Tse Jan 2006

A Survey On Physical Delivery Versus Cash Settlement In Futures Contracts, Donald Lien, Yiu Kuen Tse

Research Collection School Of Economics

A futures contract may adopt physical delivery or cash settlement to liquidate open positions after the maturity day. While traditionally physical delivery specification is favored, exchanges have recently turned to examine cash settlement possibilities. This paper summarizes current literature on settlement specifications with emphases on market manipulation, cash index construction, and hedging effectiveness comparisons.

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Coalition Formation Theories Revisited: An Empirical Investigation Of Aumann's Hypothesis, Vincent Chua, Dan S. Felsenthal Jan 2006

Coalition Formation Theories Revisited: An Empirical Investigation Of Aumann's Hypothesis, Vincent Chua, Dan S. Felsenthal

Research Collection School Of Economics

In one of the earliest attempts to examine the effect of a priori voting power on actual political phenomena, Riker (1959) looked at changes in party affiliation in the French National Assembly in 1953–54, and used these data to test the hypothesis that deputies who switched parties were seeking thereby to increase their a priori voting power. His findings were negative, or at best inconclusive.

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A Survey On Networking Games In Telecommunications, E. Altman, T. Boulogne, R. El-Azouzi, T. Jiménez, Laura Wynter Jan 2006

A Survey On Networking Games In Telecommunications, E. Altman, T. Boulogne, R. El-Azouzi, T. Jiménez, Laura Wynter

Research Collection School Of Computing and Information Systems

In this survey, we summarize different modeling and solution concepts of networking games, as well as a number of different applications in telecommunications that make use of or can make use of networking games. We identify some of the mathematical challenges and methodologies that are involved in these problems. We include here work that has relevance to networking games in telecommunications from other areas, in particular from transportation planning.

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Your Pace Or Mine: Culture, Time And Negotiation, Ian Macduff Jan 2006

Your Pace Or Mine: Culture, Time And Negotiation, Ian Macduff

Research Collection Yong Pung How School Of Law

This article explores the impact that different perceptions of time may have on cross-cultural negotiations. Beyond obvious issues of punctuality and timekeeping, differences may occur in the value placed on the uses of time and the priorities given to past, present, or future orientations. The role of time in negotiations involves two key dimensions: differing perceptions and values of time, and the management of time. Both dimensions, the author suggests, need to be on the negotiation table.

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Review Of Scott Cook, Ed., Hiding The World In The World: Uneven Discourses On The Zhuangzi, Alan Kam Leung Chan Jan 2006

Review Of Scott Cook, Ed., Hiding The World In The World: Uneven Discourses On The Zhuangzi, Alan Kam Leung Chan

Research Collection College of Integrative Studies

The ten essays collected in this volume offer different perspectives on key issues in the Zhuangzi and should be warmly welcomed as a helpful addition to the field. The authors disagree on many things about the Zhuangzi; but there is certainly nothing "uneven" about the quality of their "discourses," which is uniformly high.

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Guo Xiang, Alan Kam Leung Chan Jan 2006

Guo Xiang, Alan Kam Leung Chan

Research Collection College of Integrative Studies

A champion of the Learning of the Mysterious (Xuanxue) or neo-Daoism that gained prominence in third-century China, Guo Xiang (c. 252–312 CE) is best known for his commentary to the Zhuangzi, which offers to reconcile orthodox teachings (mingjiao) with Daoist naturalness (ziran).

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Transition Rule Elicitation Methods For Urban Cellular Automata Models, Junfeng Jiao, Luc Boerboom Jan 2006

Transition Rule Elicitation Methods For Urban Cellular Automata Models, Junfeng Jiao, Luc Boerboom

Research Collection College of Integrative Studies

In this chapter, transition rules used in urban CA models are reviewed and classified into two categories: transition potential rules and conflict resolution rules. Then, four widely used rule elicitation methods: Regression analysis, Artificial Neural network (ANN), Visual calibration, and Analytical Hierarchy Processing – Multi Criteria Evaluation (AHP-MCE) are discussed. Most of these methods are data driven methods and can be used to elicit the transition potential rules in the urban CA models. In the following, three possible rule elicitation methods: Interview, Document analysis, and Card sorting are explained and demonstrated. These three methods are driven by knowledge and can …

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Numerus Clausus: An Economic Perspective, Wei Zhang Jan 2006

Numerus Clausus: An Economic Perspective, Wei Zhang

Research Collection Yong Pung How School Of Law

Numerus clausus refers to the principle that both the form and the substance of a property right shall be prescribed by the law, which essentially restricts the freedom to “customize” the legally enforceable property interests.2 It has long been regarded as a basic principle in Civil Law countries, while the recent studies of U.S. scholars suggest that its essence exists in the Anglo-American law as well.

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