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Territoriality In Organizations, Graham Brown, Thomas B. Lawrence, Sandra L. Robinson Jul 2005

Territoriality In Organizations, Graham Brown, Thomas B. Lawrence, Sandra L. Robinson

Research Collection Lee Kong Chian School Of Business

Territorial feelings and behaviors are important, pervasive, and yet largely overlooked aspects of organizational life. Organizational members can and do become territorial over physical spaces, ideas, roles, relationships, and other potential possessions in organizations. We examine how territorial behaviors are used to construct, communicate, maintain, and restore territories in organizations. We then go on to discuss the organizational consequences of these behaviors, including their effects on organizational commitment, conflict, preoccupation, and individual isolation.

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Descriptive Naming Of Context Data Providers, Norman H. Cohen, Paul Castro, Archan Misra Jul 2005

Descriptive Naming Of Context Data Providers, Norman H. Cohen, Paul Castro, Archan Misra

Research Collection School Of Computing and Information Systems

Much context data comes from mobile, transient, and unreliable sources. Such resources are best specified by descriptive names identifying what data is needed rather than which source is to provide it. The design of descriptive names has important consequences, but until now little attention has been focused on this problem. We propose a descriptive naming system for providers of context data that provides more flexibility and power than previous naming systems by classifying data providers into “provider kinds” that are organized in an evolving hierarchy of subkinds and superkinds. New provider kinds can be inserted in the hierarchy not only …

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Co-Clustering Of Time-Evolving News Story With Transcript And Keyframe, Xiao Wu, Chong-Wah Ngo, Qing Li Jul 2005

Co-Clustering Of Time-Evolving News Story With Transcript And Keyframe, Xiao Wu, Chong-Wah Ngo, Qing Li

Research Collection School Of Computing and Information Systems

This paper presents techniques in clustering the same-topic news stories according to event themes. We model the relationship of stories with textual and visual concepts under the representation of bipartite graph. The textual and visual concepts are extracted respectively from speech transcripts and keyframes. Co-clustering algorithm is employed to exploit the duality of stories and textual-visual concepts based on spectral graph partitioning. Experimental results on TRECVID-2004 corpus show that the co-clustering of news stories with textual-visual concepts is significantly better than the co-clustering with either textual or visual concept alone.

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An Informatization Of Society Approach To E-Government: Analyzing Singapore’S E-Government Efforts, Calvin M. L. Chan, Yi Meng Lau Jul 2005

An Informatization Of Society Approach To E-Government: Analyzing Singapore’S E-Government Efforts, Calvin M. L. Chan, Yi Meng Lau

Research Collection School Of Computing and Information Systems

Despite the much publicized benefits of e-government, many countries are experiencing difficulty in yielding success in their e-government initiatives. Studies which adopt the national e-government initiatives as the unit of analysis remain largely rare. This paper aspires to provide an analysis of Singapore’s widely acclaimed success in the e-government effort at the national level to allow other countries to learn and gain from its experience. Using the ‘Conceptual Framework for the Informatization of Society’ in facilitating the data analysis, implications are drawn to offer insights for the considerations of e-government practitioners. Theoretical implications are also derived through positing that the …

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To Transform The International Criminal Trial: Merging Restorative And Retributive Justice, Mark Findlay Jul 2005

To Transform The International Criminal Trial: Merging Restorative And Retributive Justice, Mark Findlay

Research Collection Yong Pung How School Of Law

This paper establishes the case for trial transformation looking at a model of justice that is more inclusive and cognisant of competing aspirations for justice resolutions internationally.

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Intraday Stock Prices, Volume, And Duration: A Nonparametric Conditional Duration Analysis, Anthony Tay Jul 2005

Intraday Stock Prices, Volume, And Duration: A Nonparametric Conditional Duration Analysis, Anthony Tay

Research Collection School Of Economics

We investigate the distribution of high-frequency price changes, conditional on trading volume and duration between trades, on four stocks traded on the New York Stock Exchange. The conditional probabilities are estimated nonparametrically using local polynomial regression methods. We find substantial skewness in the distribution of price changes, with the direction of skewness dependent on the sign of trade. We also find that the probability of larger price changes increases with volume, but only for trades that occur with longer durations. The distribution of price changes vary with duration primarily when volume is high.

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Protection For Sale Under Monopolistic Competition, Pao Li Chang Jul 2005

Protection For Sale Under Monopolistic Competition, Pao Li Chang

Research Collection School Of Economics

This paper broadens the protection for sale model of Grossman and Helpman (1994) by incorporating the Krugman–Dixit–Stiglitz model of monopolistic competition, given its importance in explaining the prevalence of intraindustry trade. Several new results arise in this paper. First, the endogenous import tariff will never fall below zero, even in unorganized sectors. Second, the endogenous export policy for organized sectors is not necessarily an export subsidy, and can be an export tax as in unorganized sectors. Third, the level of import protection varies inversely with the degree of import penetration, regardless of whether the sector is organized or not.

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Hot Event Detection And Summarization By Graph Modeling And Matching, Yuxin Peng, Chong-Wah Ngo Jul 2005

Hot Event Detection And Summarization By Graph Modeling And Matching, Yuxin Peng, Chong-Wah Ngo

Research Collection School Of Computing and Information Systems

This paper proposes a new approach for hot event detection and summarization of news videos. The approach is mainly based on two graph algorithms: optimal matching (OM) and normalized cut (NC). Initially, OM is employed to measure the visual similarity between all pairs of events under the one-to-one mapping constraint among video shots. Then, news events are represented as a complete weighted graph and NC is carried out to globally and optimally partition the graph into event clusters. Finally, based on the cluster size and globality of events, hot events can be automatically detected and selected as the summaries of …

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Exploiting Belief Bounds: Practical Pomdps For Personal Assistant Agents, Pradeep Varakantham, Rajiv Maheswaran, Milind Tambe Jul 2005

Exploiting Belief Bounds: Practical Pomdps For Personal Assistant Agents, Pradeep Varakantham, Rajiv Maheswaran, Milind Tambe

Research Collection School Of Computing and Information Systems

Agents or agent teams deployed to assist humans often face the challenges of monitoring the state of key processes in their environment (including the state of their human users themselves) and making periodic decisions based on such monitoring. POMDPs appear well suited to enable agents to address these challenges, given the uncertain environment and cost of actions, but optimal policy generation for POMDPs is computationally expensive. This paper introduces three key techniques to speedup POMDP policy generation that exploit the notion of progress or dynamics in personal assistant domains. Policy computation is restricted to the belief space polytope that remains …

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Middleware Architecture For Evaluation And Selection Of 3rd Party Web Services For Service Providers, Dipanjan Chakraborty, Suraj K. Jaiswal, Archan Misra, Amit A. Nanavati Jul 2005

Middleware Architecture For Evaluation And Selection Of 3rd Party Web Services For Service Providers, Dipanjan Chakraborty, Suraj K. Jaiswal, Archan Misra, Amit A. Nanavati

Research Collection School Of Computing and Information Systems

This paper presents an architecture to facilitate efficient evaluation and selection of 3rd party Web services for service providers. Most service provider architectures have primarily focused on providing Web service front ends to legacy systems, aggregating and delivering services via workflows. These architectures primarily considered static business contracts between the service provider and its (Web-service enabled) business partners. This approach makes these architectures inflexible to variations in business requirement, partners' performance and customer requirements. Our architecture provides a flexible means for service providers to optimize business performance. Based on the historical performance, extant context, and optimising business rules, the appropriate …

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Why Is Management A Cliché?, Stefano Harney Jul 2005

Why Is Management A Cliché?, Stefano Harney

Research Collection Lee Kong Chian School Of Business

This article introduces the term demotics of management by asking why so much management literature reads like a cliché. Typically this question has been approached by seeing the cliché as strategic. This article instead views the cliché as symptomatic. It marks a growing problem—how can management track labor out of the workplace and into the realm of social reproduction, a realm that is increasingly, with the tendency of immaterial labor, directly productive. This problem has produced not only the explosion of popular management literature, particularly in the United States, in the last 20 years, but also what might be called …

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On The Intertemporal Risk-Return Relation: A Bayesian Model Comparison Perspective, Leping Wang Jul 2005

On The Intertemporal Risk-Return Relation: A Bayesian Model Comparison Perspective, Leping Wang

Research Collection Lee Kong Chian School Of Business

The existing empirical studies indicate that inferences on the intertemporal relation between expected return and volatility are highly sensitive to empirical specifications of return dynamics. Glosten, Jagannathan, and Runkle (1993) attempt to resolve this confusing situation by examining several generalizations of the standard GARCH-M model. They conclude a negative risk-return relation solely based on the models that are identified in the first step through a variety of diagnostic tests as relatively “better” models. However, it has not been shown in their study whether the evidence supporting their first-step model selection decision is significant or not. To the extent the strength …

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Re-Engineering Economic Space: The Case Of Singapore's Transborder Industrialization 'Experiments' In Asia, Caroline Yeoh, Wilfred Pow Ngee How, Di Kun Goh Jul 2005

Re-Engineering Economic Space: The Case Of Singapore's Transborder Industrialization 'Experiments' In Asia, Caroline Yeoh, Wilfred Pow Ngee How, Di Kun Goh

Research Collection Lee Kong Chian School Of Business

No abstract provided.

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Regret In Cancer-Related Decisions, Terry Connolly, Jochen Reb Jul 2005

Regret In Cancer-Related Decisions, Terry Connolly, Jochen Reb

Research Collection Lee Kong Chian School Of Business

Decision-related regret is a negative emotion associated with thinking about a past or future choice. The thinking component generally takes the form of a wish that things were otherwise and involves a comparison of what actually did or will take place with some better alternative--a counterfactual thought. For predecisional (anticipated) regret, the thinking involves a mental simulation of the outcomes that might result from different choice options. Prior research has focused on regret associated with decision outcomes, addressing especially (a) the comparison outcome selected and (b) whether the outcome resulted from action or inaction. More recent research examines regret associated …

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Unlawful Dividends, Unjust Enrichment, And The Defence Of Change Of Position, Cecil Duncan Macrae Jun 2005

Unlawful Dividends, Unjust Enrichment, And The Defence Of Change Of Position, Cecil Duncan Macrae

Research Collection Yong Pung How School Of Law

Economic analysis is applied to determining the effect of the change of position defense on the question of whether an innocent shareholder receiving an unlawful, mistaken dividend should be liable under English restitution law as the result of unjust enrichment. The analysis builds on and extends previous economics analysis of mistaken money transfers under restitution law. The conclusion of the analysis of the change of position defense is that unjust enrichment liability with the defense should not be extended to unlawful, mistaken dividends, even if the factors for unjust enrichment are present.

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Landmark City Campus Officially Handed Over - Smu To Launch Year-Long Celebratory Programme, Singapore Management University Jun 2005

Landmark City Campus Officially Handed Over - Smu To Launch Year-Long Celebratory Programme, Singapore Management University

SMU Press Releases and News

No abstract provided.

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Trade, Capital Accumulation And Structural Unemployment: An Empirical Study Of The Singapore Economy, Hiau Looi Kee, Hian Teck Hoon Jun 2005

Trade, Capital Accumulation And Structural Unemployment: An Empirical Study Of The Singapore Economy, Hiau Looi Kee, Hian Teck Hoon

Research Collection School Of Economics

This paper studies the factors responsible for the secular decline of Singapore's unemployment rate over the period 1966-2000 in an environment of low and stable inflation rates. We introduce wage bargaining and unions into a specific-factors, two-sector economy with an export sector and a non-tradable sector to obtain an endogenous natural unemployment rate. Increases in the relative export price and capital stock in the export sector are predicted to reduce structural unemployment. These hypotheses could not be rejected based on structural estimations and co-integration regressions. Empirically, capital accumulation in the export sector explains most of the decline in Singapore's unemployment …

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Diffusion Of Art: An Investigation Of The Evolution Of Modern Indian Art, Srinivas K. Reddy, Mayukh Dass, Umesh Gaur Jun 2005

Diffusion Of Art: An Investigation Of The Evolution Of Modern Indian Art, Srinivas K. Reddy, Mayukh Dass, Umesh Gaur

Research Collection Lee Kong Chian School Of Business

No abstract provided.

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A Two-Stage Realized Volatility Approach To The Estimation For Diffusion Processes From Discrete Observations, Peter C. B. Phillips, Jun Yu Jun 2005

A Two-Stage Realized Volatility Approach To The Estimation For Diffusion Processes From Discrete Observations, Peter C. B. Phillips, Jun Yu

Research Collection School Of Economics

This paper motivates and introduces a two-stage method for estimating diffusion processes based on discretely sampled observations. In the first stage we make use of the feasible central limit theory for realized volatility, as recently developed in Barndorff-Nielsen and Shephard (2002), to provide a regression model for estimating the parameters in the diffusion function. In the second stage the in-fill likelihood function is derived by means of the Girsanov theorem and then used to estimate the parameters in the drift function. Consistency and asymptotic distribution theory for these estimates are established in various contexts. The finite sample performance of the …

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Learning Outcomes Oriented Assessment Methods In An Active Learning Environment, Arcot Desai Narasimhalu Jun 2005

Learning Outcomes Oriented Assessment Methods In An Active Learning Environment, Arcot Desai Narasimhalu

Research Collection School Of Computing and Information Systems

Singapore Management University uses interactive seminar style teaching in class rooms. Most of its students hail from Singapore and are generally new to active learning and constructive participation in the seminar style classes. This paper reports findings from a freshmen first term course titled IS 101: Seminar for ISM Majors.

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Knowledge Management Mechanisms Of Financial Service Sites, Fiona Fui-Hoon Nah, Keng Siau, Y. Tian Jun 2005

Knowledge Management Mechanisms Of Financial Service Sites, Fiona Fui-Hoon Nah, Keng Siau, Y. Tian

Research Collection School Of Computing and Information Systems

How can we effectively acquire, use, and manage knowledge via the Web?

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Aggregate Nearest Neighbor Queries In Spatial Databases, Dimitris Papadias, Yufei Tao, Kyriakos Mouratidis, Chun Kit Hui Jun 2005

Aggregate Nearest Neighbor Queries In Spatial Databases, Dimitris Papadias, Yufei Tao, Kyriakos Mouratidis, Chun Kit Hui

Research Collection School Of Computing and Information Systems

Given two spatial datasets P (e.g., facilities) and Q (queries), an aggregate nearest neighbor (ANN) query retrieves the point(s) of P with the smallest aggregate distance(s) to points in Q. Assuming, for example, n users at locations q1,...qn, an ANN query outputs the facility p belongs to P that minimizes the sum of distances |pqi| for 1 is less than or equal to i is less than or equal to n that the users have to travel in order to meet there. Similarly, another ANN query may report the point p belongs to P that minimizes the maximum distance that …

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Mapping The Irish Policy Space: Voter And Party Spaces In Preferential Elections, Kenneth Benoit, Michael Laver Jun 2005

Mapping The Irish Policy Space: Voter And Party Spaces In Preferential Elections, Kenneth Benoit, Michael Laver

Research Collection School of Social Sciences

In this note we map the Irish policy space, locating both voters and parties on the most salient policy dimensions in Ireland. Estimates of the voter locations are based on the Irish National Election Survey (INES), conducted in 2002. Estimates of the party positions are based on an expert survey of party positions conducted by the authors in late 2002. We show that respondent self-placements on a priori policy scales are highly biased and difficult to interpret, and we rely instead on building scale positions for respondents from their answers to relevant attitude questions in the INES. The results provide …

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Dsi: A Fully Distributed Spatial Index For Wireless Data Broadcast, Wang-Chien Lee, Baihua Zheng Jun 2005

Dsi: A Fully Distributed Spatial Index For Wireless Data Broadcast, Wang-Chien Lee, Baihua Zheng

Research Collection School Of Computing and Information Systems

Recent announcement of the MSN Direct Service has demonstrated the feasibility and industrial interest in utilizing wireless broadcast for pervasive information services. To support location-based services in wireless data broadcast systems, a distributed spatial index (called DSI) is proposed in this paper. DSI is highly efficient because it has a linear yet fully distributed structure that facilitates multiple search paths to be naturally mixed together by sharing links. Moreover, DSI is very resilient in error-prone wireless communication environments. Search algorithms for two classical location-based queries, window queries and kNN queries, based on DSI are presented. Performance evaluation of DSI shows …

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Conceptual Partitioning: An Efficient Method For Continuous Nearest Neighbor Monitoring, Kyriakos Mouratidis, Marios Hadjieleftheriou, Dimitris Papadias Jun 2005

Conceptual Partitioning: An Efficient Method For Continuous Nearest Neighbor Monitoring, Kyriakos Mouratidis, Marios Hadjieleftheriou, Dimitris Papadias

Research Collection School Of Computing and Information Systems

Given a set of objects P and a query point q, a k nearest neighbor (k-NN) query retrieves the k objects in P that lie closest to q. Even though the problem is well-studied for static datasets, the traditional methods do not extend to highly dynamic environments where multiple continuous queries require real-time results, and both objects and queries receive frequent location updates. In this paper we propose conceptual partitioning (CPM), a comprehensive technique for the efficient monitoring of continuous NN queries. CPM achieves low running time by handling location updates only from objects that fall in the vicinity of …

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Efficient Anonymous Roaming And Its Security Analysis, Guomin Yang, Duncan S. Wong, Xiaotie Deng Jun 2005

Efficient Anonymous Roaming And Its Security Analysis, Guomin Yang, Duncan S. Wong, Xiaotie Deng

Research Collection School Of Computing and Information Systems

The Canetti-Krawczyk (CK) model uses resuable modular components to construct indistinguishability-based key exchange protocols. The reusability of modular protocol components makes it easier to construct and prove new protocols when compared with other provably secure approaches. In this paper, we build an efficient anonymous and authenticated key exchange protocol for roaming by using the modular approach under the CK-model. Our protocol requires only four message flows and uses only standard cryptographic primitives. We also propose a one-pass counter based MT-authenticator and show its security under the assumption that there exists a MAC which is secure against chosen message attack.

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On Assigning Place Names To Geography Related Web Pages, Wenbo Zong, Dan Wu, Aixin Sun, Ee Peng Lim, Dion Hoe-Lian Goh Jun 2005

On Assigning Place Names To Geography Related Web Pages, Wenbo Zong, Dan Wu, Aixin Sun, Ee Peng Lim, Dion Hoe-Lian Goh

Research Collection School Of Computing and Information Systems

In this paper, we attempt to give spatial semantics to web pages by assigning them place names. The entire assignment task is divided into three sub-problems, namely place name extraction, place name disambiguation and place name assignment. We propose our approaches to address these sub-problems. In particular, we have modified GATE, a well-known named entity extraction software, to perform place name extraction using a US Census gazetteer. A rule-based place name disambiguation method and a place name assignment method capable of assigning place names to web page segments have also been proposed. We have evaluated our proposed disambiguation and assignment …

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Optimal Sequential Decision Architectures And The Robustness Of Hierarchies And Polyarchies, Winston T. H. Koh Jun 2005

Optimal Sequential Decision Architectures And The Robustness Of Hierarchies And Polyarchies, Winston T. H. Koh

Research Collection School Of Economics

This paper studies collective decision making in the context of a project selection model. We derive the optimal decision architecture in the presence of marginal decision costs, and investigate the circumstances under which the hierarchy and polyarchy emerge as optimal sequential architectures. Our analysis extends previous results on optimal organizational decision-making to a sequential setting, and further demonstrates the fragility of the hierarchy and polyarchy as optimal architectures.

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Jackknifing Bond Option Prices, Peter C. B. Phillips, Jun Yu Jun 2005

Jackknifing Bond Option Prices, Peter C. B. Phillips, Jun Yu

Research Collection School Of Economics

Prices of interest rate derivative securities depend crucially on the mean reversion parameters of the underlying diffusions. These parameters are subject to estimation bias when standard methods are used. The estimation bias can be substantial even in very large samples and much more serious than the discretization bias, and it translates into a bias in pricing bond options and other derivative securities that is important in practical work. This article proposes a very general and computationally inexpensive method of bias reduction that is based on Quenouille's (1956; Biometrika, 43, 353-360) jackknife. We show how the method can be applied directly …

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Evaluating G-Portal For Geography Learning And Teaching, Chew-Hung Chang, John G. Hedberg, Yin-Leng Theng, Ee Peng Lim, Tiong-Sa Teh, Dion Hoe-Lian Goh Jun 2005

Evaluating G-Portal For Geography Learning And Teaching, Chew-Hung Chang, John G. Hedberg, Yin-Leng Theng, Ee Peng Lim, Tiong-Sa Teh, Dion Hoe-Lian Goh

Research Collection School Of Computing and Information Systems

This paper describes G-Portal, a geospatial digital library of geographical assets, providing an interactive platform to engage students in active manipulation and analysis of information resources and collaborative learning activities. Using a G-Portal application in which students conducted a field study of an environmental problem of beach erosion and sea level rise, we describe a pilot study to evaluate usefulness and usability issues to support the learning of geographical concepts, and in turn teaching.

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