Digital Commons Network^™

Predicting Bottleneck Bandwidth Sharing By Generalized Tcp Flows, Archan Misra, Teunis Ott, John Baras

Research Collection School Of Computing and Information Systems

The paper presents a technique for computing the individual throughputs and the average queue occupancy when multiple TCP connections share a single bottleneck buffer. The bottleneck buffer is assumed to perform congestion feedback via randomized packet marking or drops. We first present a fixed point-based analytical technique to compute the mean congestion window sizes, the mean queue occupancy and the individual throughputs when the TCP flows perform idealized congestion avoidance. We subsequently extend the technique to analyze the case where TCP flows perform generalized congestion avoidance and demonstrate the use of this technique under the Assured Service model, where each …

Venture Capital And Economic Growth: An Industry Overview And Singapore's Experience, Francis Koh, Winston T. H. Koh

Research Collection School Of Economics

This paper provides an overview of the venture capital industry, and its development in Asia and Singapore. Venture capital plays an important role in innovation and economic growth. Indeed, the resurgence of the United States as a technology leader is intimately linked to the success of Silicon Valley. As Singapore enters the next phase of economic development, the creation of internal engines of growth is an urgent task. The Singapore government has done much to provide an environment for entrepreneurship to thrive. Its success at replicating the Silicon Valley culture will be important for Singapore’s future economic success.

Lay Theories And Evaluation-Based Organization Of Impressions: An Application Of The Memory Search Paradigm, Yuk-Yue Tong, Chi-Yue Chiu

Research Collection School of Social Sciences

People may believe that personal attributes are fixed entities that cannot be changed (hold an entity theory). Alternatively, they may believe that qualities of a person are malleable (hold an incremental theory). In the present research, the authors used Sternberg's (1966) memory search task to examine entity and incremental theorists' cognitive strategies in memory search. It was hypothesized that entity theorists, who have a greater tendency to make spontaneous evaluation of people, would organize impressions in short-term memory according to whether the stimulus persons are positively or negatively evaluated. Next, they might compare the probe only to the stimulus persons …

Dynamical Evolutionary Psychology: Mapping The Domains Of The New Interactionist Paradigm, Douglas T. Kenrick, Jon K. Maner, Jon Butner, Norman P. Li, D. Vaughn Becker, Mark Schaller

Research Collection School of Social Sciences

Dynamical systems and evolutionary theories have both been proposed as integrative approaches to psychology. These approaches are typically applied to different sets of questions. Dynamical systems models address the properties of psychological systems as they emerge and change over time; evolutionary models address the specific functions and contents of psychological structures. New insights can be achieved by integrating these two paradigms, and we propose a framework to begin doing so. The framework specifies a set of six evolutionarily fundamental social goals that place predictable constraints on emergent processes within and between individuals, influencing their dynamics over the short-term, and across …

Web Classification Using Support Vector Machine, Aixin Sun, Ee Peng Lim

Research Collection School Of Computing and Information Systems

In web classification, web pages from one or more web sites are assigned to pre-defined categories according to their content. Since web pages are more than just plain text documents, web classification methods have to consider using other context features of web pages, such as hyperlinks and HTML tags. In this paper, we propose the use of Support Vector Machine (SVM) classifiers to classify web pages using both their text and context feature sets. We have experimented our web classification method on the WebKB data set. Compared with earlier Foil-Pilfs method on the same data set, our method has been …

A Corrected Plug-In Method For The Quantile Confidence Interval Of A Transformed Regression, Zhenlin Yang, Yiu Kuen Tse

Research Collection School Of Economics

In this paper we propose an analytically corrected plug-in method for constructing confidence intervals of the conditional quantiles of a response variable with data transformation. The method can be applied to (i) a general conditional regression quantile, (ii) a general monotonic transformation, and (iii) a transformation model with heteroscedastic errors. Our results extend those in Yang (2002a), in which the median of a response variable under the Box-Cox transformation with homoscedastic errors was considered. A Monte Carlo experiment is conducted to compare the performance of the corrected plug-in method, the plug-in method and the delta method. The corrected plug-in method …

Tax Cuts, Employment And Asset Prices: A Real Intertemporal Model, Hian Teck Hoon, Edmund S. Phelps

Research Collection School Of Economics

We determine the effects of a delayed or immediate tax cut with or without a sunset feature in a real customer-market, nonRicardian economy. Our model incorporates both the supply-sider channel, through which reduced wage income taxes stimulate work effort, as well as the Feldstein-Rubin-Summers channel, through which cuts in income tax, in widening the deficit and thus driving up future short real interest rates, has a chilling effect on present and future investment, so reducing growth and employment on that account. After establishing conditions under which fiscal policy is sustainable, we first show that a delayed tax cut may depress …

Venture Capital And Economic Growth: An Industry Overview And Singapore's Experience, Francis Koh, Winston T. H. Koh

Research Collection Lee Kong Chian School Of Business

This paper provides an overview of the venture capital industry, and its development in Asia and Singapore. Venture capital plays an important role in innovation and economic growth. Indeed, the resurgence of the United States as a technology leader is intimately linked to the success of Silicon Valley. As Singapore enters the next phase of economic development, the creation of internal engines of growth is an urgent task. The Singapore government has done much to provide an environment for entrepreneurship to thrive. Its success at replicating the Silicon Valley culture will be important for Singapore's future economic success.

The Choice Between Joint Venture And Wholly Owned Subsidiary: An Institutional Perspective, Daphne W. Yiu, Shige Makino

Research Collection Lee Kong Chian School Of Business

The study of foreign entry-mode choice has been based almost exclusively on transaction-cost theory. This theory focuses mainly on the impacts of firm- and industry-specific factors on the choice of entry mode, taking the effects of country-specific contextual factors as constant or less important. In contrast, the institutional perspective emphasizes the importance of the influence of both institutional forces embedded in national environments and decision makers' cognitive constraints on the founding conditions of new ventures. Still, this theoretical perspective has yet to provide insights into how institutional factors influence the choice of foreign entry mode. The primary goal of the …

The Effects Of Business-University Alliances On Innovative Output And Financial Performance: A Study Of Publicly Traded Biotechnology Companies, Gerard George, Shaker A. Zahra, D. Robley Wood

Research Collection Lee Kong Chian School Of Business

Companies in the biotechnology industry face major challenges in developing and commercializing new products. Focusing on publicly traded biotechnology firms that are not members of university incubators or research parks, this paper argues that the links these companies develop with universities can have beneficial effects on a company's operations. Analysis of 2457 alliances undertaken by 147 biotechnology firms shows that companies with university linkages have lower research and development (R&D) expenses while having higher levels of innovative output. However, the results do not support the proposition that companies with university linkages achieve higher financial performance than similar firms without such …

Structural Analysis Of Audit Evidence Using Belief Functions, Hai Lu, Hai Lu

Research Collection School Of Accountancy

This article performs two types of analysis using Dempster-Shafer theory of belief functions for evidential reasoning. The first analysis deals with the impact of the structure of audit evidence on the overall belief at each variable in the network, variables being the account balance to be audited, the related transaction streams, and the associated audit objectives. The second analysis deals with the impact of the relationship (logical "and" and "algebraic relationship") among various variables in the network on the overall belief. For our first analysis, we change the evidential structure from a network to a tree and determine its impact.

Cache Invalidation And Replacement Strategies For Location-Dependent Data In Mobile Environments, Baihua Zheng, Jianliang Xu, Dik Lun Lee

Research Collection School Of Computing and Information Systems

Mobile location-dependent information services (LDISs) have become increasingly popular in recent years. However, data caching strategies for LDISs have thus far received little attention. In this paper, we study the issues of cache invalidation and cache replacement for location-dependent data under a geometric location model. We introduce a new performance criterion, called caching efficiency, and propose a generic method for location-dependent cache invalidation strategies. In addition, two cache replacement policies, PA and PAID, are proposed. Unlike the conventional replacement policies, PA and PAID take into consideration the valid scope area of a data value. We conduct a series of simulation …

Mobile Information Systems – Research Directions On The Conceptual And Logical Level, J. Krogstie, K. Lyytinen, A. Opdahl, B. Pernici, Keng Siau, K. Smolander

Research Collection School Of Computing and Information Systems

This paper discusses new challenges and possible approaches for developing and evolving mobile information systems, with focus on model-based approaches on the conceptual and logical level. We have experienced these new challenges through several research and industrial projects on mobile solutions, usability and model-based approaches over the last years. We summarize the main challenges on how model-based approaches can support the development of mobile information systems that are to be used together with other types of systems, primarily in a professional setting and indicate upcoming research issues in this very dynamic area. We argue that this research area is also …

On The Performance Of Geometric Chart With Estimated Control Limits, Zhenlin Yang, Min Xie, Vellaisamy Kuralmani, Kwok-Leung Tsui

Research Collection School Of Economics

The control chart based on the geometric distribution (geometric chart) has been shown to be competitive with p- or np-charts for monitoring the proportion nonconforming, especially for applications in high quality manufacturing environments. However, implementing a geometric chart is often based on the assumption that the in-control proportion nonconforming is known or accurately estimated for a high quality process, an accurate parameter estimate may require a very large sample size that is seldom available. In this paper we investigate the sample size effect when the proportion nonconforming is estimated. An analytical approximation is derived to compute shift detection probabilities and …

A Novel Approach For The Analysis Of High Frequency Vibrations, G. W. Wei, Yibao Zhao, Y. Xiang

Research Collection Lee Kong Chian School Of Business

Despite much effort in the past few decades, the numerical prediction of high-frequency vibrations remains a challenging task to the engineering and scientific communities due to the numerical instability of existing computational methods. However, such prediction is of crucial importance to certain problems of pressing practical concern, as pointed out by Langley and Bardell (1998 The Aeronautical Journal102, 287-297). This paper introduces the discrete singular convolution (DSC) algorithm for the prediction and analysis of high-frequency vibration of structures. Both a beam and two-span plates are employed as test examples to demonstrate the capability of the DSC algorithm for high-frequency vibration …

Investigating The Effects Of Store-Brand Introduction On Retailer Demand And Pricing Behavior, Pradeep K. Chintagunta, Andre Bonfrer, Inseong Song

Research Collection Lee Kong Chian School Of Business

The effects of the introduction of a store-brand into a particular product category are studied. The paper focuses on the effect of store-brand introduction on the demand as well as on the supply side. On the demand side, the changes in preferences for the national brands and price elasticities in the category are investigated. On the supply side, the effects of the new entrant on the interactions between the national brand manufacturers and the retailer introducing the store brand are studied, including how these interactions influence the retailer's pricing behavior. In doing so, it is possible to test whether the …

The Kpss Test With Seasonal Dummies, Sainan Jin, Sainan Jin

Research Collection School Of Economics

It is shown that the KPSS test for stationarity may be applied without change to regressions with seasonal dummies. In particular, the limit distribution of the KPSS statistic is the same under both the null and alternative hypotheses whether or not seasonal dummies are used.

Market Segmentation And Information Values Of Earnings Announcements: Some Empirical Evidence From An Event Study On The Chinese Stock Market, Yu Gao, Yiu Kuen Tse

Research Collection School Of Economics

This paper investigates the trading activities of two distinct classes of shareholders, namely, the Chinese domestic investors and the foreign investors in the segmented Chinese A-share and B-share markets, respectively. We conduct an event study on the annual earnings announcements based on two different accounting standards: IAS and PRC GAAP. The earnings announcements based on IAS and PRC GAAP are value relevant. The investors in the B-share market react to both the IAS and PRC GAAP earnings announcements, while the investors in the A-share market pay more attention to the PRC GAAP earnings reports. In the B-share market, positive abnormal …

Estimation Of Hyperbolic Diffusion Using Mcmc Method, Yiu Kuen Tse, Jun Yu, X. B. Chang

Research Collection School of Economics

In this paper we propose a Bayesian method for estimating hyperbolic diffusion models. The approach is based on the Markov Chain Monte Carlo (MCMC) method after discretization via the Milstein scheme. Our simulation study shows that the hyperbolic diffusion exhibits many of the stylized facts about asset returns documented in the financial econometrics literature, such as a slowly declining autocorrelation function of absolute returns. We demonstrate that the MCMC method provides a useful tool to analyze hyperbolic diffusions. In particular, quantities of posterior distributions obtained from MCMC outputs can be used for statistical inferences

Increasing Transparency In Government, Ann Florini

Research Collection School of Social Sciences

The article focuses on the transparency in the government and investigates how transparency is related directly to achieving and maintaining international peace, by transforming the security relationship between countries. It also examines transparency's indirect role in contributing to legitimate and effective governance and explores the trends in transparency in national politics, international organizations, and environmental management. Information is the lifeblood of both democracies and markets. Without information, citizens have no basis upon which to evaluate their representatives or voice their opinions, and both elections and the very process of representation become a meaningless sham. Without information, the financial markets upon …

Social Entrepreneurship In Singapore, Wee Liang Tan, Teck Meng Tan

Research Collection Lee Kong Chian School Of Business

Social entrepreneurship is a new phenomenon in Singapore. Unlike the US, where there are entrepreneurship programs offered at various ACCSB accredited universities such programs do not as yet exist in Asia. The motivations for social entrepreneurship in Asia differ from those in developed countries. While as social entrepreneurship often stem from the social agenda of successful entrepreneurs who are motivated to repay society, the recent trend of social entrepreneurship in Asia may stem from initiatives directed at political liberalisation and the development of civil society on the part of existing governments. The Singapore government in 1997 introduced a series of …

Personalized Classification For Keyword-Based Category Profiles, Aixin Sun, Ee Peng Lim, Wee-Keong Ng

Research Collection School Of Computing and Information Systems

Personalized classification refers to allowing users to define their own categories and automating the assignment of documents to these categories. In this paper, we examine the use of keywords to define personalized categories and propose the use of Support Vector Machine (SVM) to perform personalized classification. Two scenarios have been investigated. The first assumes that the personalized categories are defined in a flat category space. The second assumes that each personalized category is defined within a pre-defined general category that provides a more specific context for the personalized category. The training documents for personalized categories are obtained from a training …

Pickup And Delivery Problem With Time Windows: Algorithms And Test Case Generation, Hoong Chuin Lau, Zhe Liang

Research Collection School Of Computing and Information Systems

In the pickup and delivery problem with time windows (PDPTW), vehicles have to transport loads from origins to destinations respecting capacity and time constraints. In this paper, we present a two-phase method to solve the PDPTW. In the first phase, we apply a novel construction heuristics to generate an initial solution. In the second phase, a tabu search method is proposed to improve the solution. Another contribution of this paper is a strategy to generate good problem instances and benchmarking solutions for PDPTW, based on Solomon' s benchmark test cases for VRPTW. Experimental results show that our approach yields very …

Laughing With The Gurus, David Greatbatch, Timothy Adrian Robert Clark

Research Collection Lee Kong Chian School Of Business

Management gurus are among the most influential public orators of the day. But mastery of age–old rhetorical devices, including the use of humour, is central to their effectiveness.

Making Justice Sense Of Local-Expatriate Compensation Disparity: Mitigation By Local Referents, Ideological Explanations, And Interpersonal Sensitivity In China-Foreign Joint Ventures, Chao C. Chen, Jaepil Choi, Chu-Cheng Chi

Research Collection Lee Kong Chian School Of Business

We examined how local employees of international joint ventures (IJVs) perceived disparity between their compensation and foreign expatriates' compensation from equity theory and social justice perspectives. Chinese locals perceived less fairness when comparing their compensation with expatriates' than when comparing it with other locals'. However, fairness vis-a-vis expatriates increased if the locals were compensated higher than their peers in other IJVs or endorsed ideological explanations for expatriates' advantage. Furthermore, expatriates' interpersonal sensitivity toward locals reduced the effect of disparity on perceived fairness. Finally, perceived compensation fairness was related positively to compensation satisfaction but negatively to intentions to quit.

In Search Of Permanent Homes: Singapore's House Churches And The Politics Of Space, Lily Kong

Research Collection School of Social Sciences

This paper focuses on one category of the 'unofficially sacred'-namely, those secular spaces which are used for worship and, in particular, residential spaces which are turned into 'house churches'. Using the case study of a house church in Singapore, the paper examines issues about the politics of religion in urban landscapes in a secular and simultaneously multireligious state. Contrary and in addition to current wisdoms about the politics of religious space, it is argued that various politics are observed: a politics of inclusion; a politics of hybridisation and in-betweenness; a politics of appropriation and nationalisation; and a politics of impermanence …

Dsc Analysis Of Rectangular Plates With Non-Uniform Boundary Conditions, Yibao Zhao, G. W. Wei

Research Collection Lee Kong Chian School Of Business

This paper introduces the discrete singular convolution (DSC) for the vibration analysis of rectangular plates with non-uniform and combined boundary conditions. A systematic scheme is proposed for the treatment of boundary conditions required in the proposed approach. The validity of the DSC approach for plate vibration is tested by using a large number of numerical examples that have a combination of simply supported, clamped and transversely supported (with non-uniform elastic rotational restraint) edges. The present results are in excellent agreement with those in the literature.

Trust In Leadership: Meta-Analytic Findings And Implications For Research And Practice, Kurt T. Dirks, Donald L. Ferrin

Research Collection Lee Kong Chian School Of Business

In this study, the authors examined the findings and implications of the research on trust in leadership that has been conducted during the past 4 decades. First, the study provides estimates of the primary relationships between trust in leadership and key outcomes, antecedents, and correlates (k = 106). Second, the study explores how specifying the construct with alternative leadership referents (direct leaders vs. organizational leadership) and definitions (types of trust) results in systematically different relationships between trust in leadership and outcomes and antecedents. Direct leaders (e.g., supervisors) appear to be a particularly important referent of trust. Last, a theoretical framework …

On Uncertainty, Ambiguity, And Complexity In Project Management, Michael T. Pich, Christoph H. Loch, Arnoud De Meyer

Research Collection Lee Kong Chian School Of Business

This article develops a model of a project as a payoff function that depends on the state of the world and the choice of a sequence of actions. A causal mapping, which may be incompletely known by the project team, represents the impact of possible actions on the states of the world. An underlying probability space represents available information about the state of the world. Interactions among actions and states of the world determine the complexity of the payoff function. Activities are endogenous, in that they are the result of a policy that maximizes the expected project payoff.

A key …

Interference Between Verbal Concept Formation And Spatial Mental Rotation In Female Subjects, Tamas Makany, Kázmér Karadi, János Kallai, Lynn Nadel

Research Collection Lee Kong Chian School Of Business

In this study the relation between spatial cognition and verbal intelligence abilities was examined in case of 52 women. Interference between mental rotation performance and verbal intelligence scores was found. Women with good verbal abilities have lower scores in mental rotation tasks than subjects with poorer verbal abilities. This finding is in accordance with some basic models of a dual-coding system. The spatial functions represented in mental rotation interfered with verbal-based concept formation and lexical knowledge in college women.