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Mining Multiple Visual Appearances Of Semantics For Image Annotation, Hung-Khoon Tan, Chong-Wah Ngo Jan 2007

Mining Multiple Visual Appearances Of Semantics For Image Annotation, Hung-Khoon Tan, Chong-Wah Ngo

Research Collection School Of Computing and Information Systems

This paper investigates the problem of learning the visual semantics of keyword categories for automatic image annotation. Supervised learning algorithms which learn only a single concept point of a category are limited in their effectiveness for image annotation. We propose to use data mining techniques to mine multiple concepts, where each concept may consist of one or more visual parts, to capture the diverse visual appearances of a single keyword category. For training, we use the Apriori principle to efficiently mine a set of frequent blobsets to capture the semantics of a rich and diverse visual category. Each concept is …

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The Case For Sports Law Arbitration And Practice In Singapore, Kam Wai, Warren Bartholomew Chik Jan 2007

The Case For Sports Law Arbitration And Practice In Singapore, Kam Wai, Warren Bartholomew Chik

Research Collection Yong Pung How School Of Law

No abstract provided.

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The Bid Challenge Procedures Under The Wto Government Procurement Agreement: A Critical Study Of The Hong Kong Experience, Henry Gao Jan 2007

The Bid Challenge Procedures Under The Wto Government Procurement Agreement: A Critical Study Of The Hong Kong Experience, Henry Gao

Research Collection Yong Pung How School Of Law

While there has been an extensive literature on the challenge procedure of the WTO Government Procurement Agreement (GPA) in general, as well as excellent country studies on the operation of the national challenge procedures of several key GPA Members, no such study has been conducted for Hong Kong yet. In the view of the author, even though Hong Kong has a relatively small procurement market, it combines the features of a clean and effective government and a highly internationalised procurement market, and thus makes an interesting subject of study. In this article, the author examines the efforts made by the …

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Rationalising Re Hastings-Bass: A Duty To Act On Proper Bases, Hang Wu Tang Jan 2007

Rationalising Re Hastings-Bass: A Duty To Act On Proper Bases, Hang Wu Tang

Research Collection Yong Pung How School Of Law

In recent times, the courts have increasingly invoked the power to undo the adverse consequences caused by a trustee's acts in certain circumstances. The basis for such an intervention is premised on the so-called rule in Re Hastings-Bass.1 This development has generated enormous interest in terms of case law and essays from the judiciary, legal academy and practising lawyers. Commentators are divided on whether Re Hastings-Bass has a sound jurisprudential foundation. The thesis of this paper is that Re Hastings-Bass is best understood as a doctrine based on a trustee's duty to act on proper bases and not one premised …

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Contract Law, Chee Ho Tham, Pearlie Koh, Pey Woan Lee Jan 2007

Contract Law, Chee Ho Tham, Pearlie Koh, Pey Woan Lee

Research Collection Yong Pung How School Of Law

No abstract provided.

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What's Ahead For 2007? Knowledge@Wharton Network Surveys The Globe, Knowledge@Smu Dec 2006

What's Ahead For 2007? Knowledge@Wharton Network Surveys The Globe, Knowledge@Smu

Knowledge@SMU

On the financial front, 2006 has been a pretty good year all around. Stock markets in many countries have rallied, energy prices have fallen, inflation is relatively low and growth in GDP ranges from respectable to robust. But the economies of most countries also face a number of threats -- some predictable, some not -- that could derail recent gains in our increasingly connected global markets. What's ahead for 2007 in the U.S., India, Europe, Latin America, China and other parts of the world? We offer a roundup of reports from the Knowledge@Wharton Network, including India Knowledge@Wharton, Universia Knowledge@Wharton and …

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The Effect Of The Options Backdating Scandal On The Stock-Price Performance Of 110 Accused Companies, Gennaro Bernile, Gregg A. Jarrell, Howard Mulcahey Dec 2006

The Effect Of The Options Backdating Scandal On The Stock-Price Performance Of 110 Accused Companies, Gennaro Bernile, Gregg A. Jarrell, Howard Mulcahey

Research Collection Lee Kong Chian School Of Business

Since academic scholars and the Wall Street Journal reported widespread evidence indicating that option grants to executives were backdated, an avalanche of news stories followed documenting this ever-widening corporate scandal. In this study we ask: "How do disclosures of backdating affect shareholder value?" We closely examine 110 companies listed in the Wall Street Journal's Perfect Payday webpage, collecting all news stories related to options backdating. We find that shareholders of these 110 companies suffer on average significant stock-price declines, ranging between 20% and 50%. Moreover, these losses do not seem to be due to temporary overreactions (at least so far). …

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Simulation-Based Estimation Of Contingent-Claims Prices, Peter C. B. Phillips, Jun Yu Dec 2006

Simulation-Based Estimation Of Contingent-Claims Prices, Peter C. B. Phillips, Jun Yu

Research Collection School Of Economics

A new methodology is proposed to estimate theortical prices of financial contingent-claims whose values are dependent on some other underlying financial assets. In the literature the preferred choice of estimator is usually maximum likelihood (ML). ML has strong asymptotic justification but is not necessarily the best method in finite samples. The present paper proposes instead a simulation-based method that improves the finite sample performance of the ML estimator while maintaining its good asymptotic properties. The methods are implemented and evaluated here in the Black-Scholes option pricing model and in the Vasicek bond pricing model, but have wider applicability. Monte Carlo …

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Indirect Inference For Dynamic Panel Models, Christian Gourieroux, Peter C. B. Phillips, Jun Yu Dec 2006

Indirect Inference For Dynamic Panel Models, Christian Gourieroux, Peter C. B. Phillips, Jun Yu

Research Collection School Of Economics

It is well-known that maximum likelihood (ML) estimation of the autoregressive parameter of a dynamic panel data model with fixed effects is inconsistent under fixed time series sample size (T) and large cross section sample size (N) asymptotics. The estimation bias is particularly relevant in practical applications when T is small and the autoregressive parameter is close to unity. The present paper proposes a general, computationally inexpensive method of bias reduction that is based on indirect inference (Gouriéroux et al., 1993), shows unbiasedness and analyzes efficiency. The method is implemented in a simple linear dynamic panel model, but has wider …

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Measuring Qualities Of Articles Contributed By Online Communities, Ee Peng Lim, Ba-Quy Vuong, Hady W. Lauw, Aixin Sun Dec 2006

Measuring Qualities Of Articles Contributed By Online Communities, Ee Peng Lim, Ba-Quy Vuong, Hady W. Lauw, Aixin Sun

Research Collection School Of Computing and Information Systems

Using open source Web editing software (e.g., wiki), online community users can now easily edit, review and publish articles collaboratively. While much useful knowledge can be derived from these articles, content users and critics are often concerned about their qualities. In this paper, we develop two models, namely basic model and peer review model, for measuring the qualities of these articles and the authorities of their contributors. We represent collaboratively edited articles and their contributors in a bipartite graph. While the basic model measures an article's quality using both the authorities of contributors and the amount of contribution from each …

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Rapid Identification Of Column Heterogeneity, Bing Tian Dai, Nick Koudas, Beng Chin Ooi, Divesh Srivastava, Suresh Venkatasubramanian Dec 2006

Rapid Identification Of Column Heterogeneity, Bing Tian Dai, Nick Koudas, Beng Chin Ooi, Divesh Srivastava, Suresh Venkatasubramanian

Research Collection School Of Computing and Information Systems

No abstract provided.

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Online Advertising By The Comparison Challenge Approach, Jae Wong Lee, Jae Kyu Lee Dec 2006

Online Advertising By The Comparison Challenge Approach, Jae Wong Lee, Jae Kyu Lee

Research Collection School Of Computing and Information Systems

To enhance the effectiveness of online comparisons from a manufacturer's point of view, we develop a framework for the comparison challenge approach. To develop the comparison challenge framework, we analyze 12 factors that determine the characteristics of comparison and propose models of valuable comparison challenges using the CompareMe and CompareThem strategies. We demonstrate the approaches with the example of PC selection. To help plan the comparison challenges, we formulate a mathematical programming model that maximizes the total value of comparison under the constraints of comparison opportunity and budgetary limitation. The model is applied to eight comparison scenarios, and its performance …

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Identifying Difficulties In Learning Uml, Keng Siau, Poi-Peng Loo Dec 2006

Identifying Difficulties In Learning Uml, Keng Siau, Poi-Peng Loo

Research Collection School Of Computing and Information Systems

Despite its recognition as a standard object-oriented modeling language, Unified Modeling Language (UML) has been criticized for such deficiencies as semantic inconsistencies, vagueness, and conflicting notations. the relationship between these deficiencies and the difficulties in the learning process is the focus of this study. A concept mapping technique is used to unveil the learning difficulties and suggestions for alleviating them are provided.

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Managing News In A Managed Media: Mediating The Message In Malaysiakini.Com, Augustine Pang Dec 2006

Managing News In A Managed Media: Mediating The Message In Malaysiakini.Com, Augustine Pang

Research Collection Lee Kong Chian School Of Business

Widely regarded as an anomaly in the neo-authoritarian system in Malaysia, Malaysiakini.com is proving that managing an independent media in a government-managed media landscape is more than a Sisyphean struggle. Employing participant observation and interviews, supplemented by artifacts and media accounts, this study seeks to understand the media management of Malaysiakini.com through news management, using Shoemaker and Reese’s (1996) hierarchy of influence model, which posits a framework of internal and external forces that affect news management. The study found determined attempts to minimize ideological influences through media socialization by accentuating on the direct influences, such as the journalists’ role in …

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Certainty As A Moderator Of Feedback Reactions? A Test Of The Strength Of The Self-Verification Motive, Frederik Anseel, Filip Lievens Dec 2006

Certainty As A Moderator Of Feedback Reactions? A Test Of The Strength Of The Self-Verification Motive, Frederik Anseel, Filip Lievens

Research Collection Lee Kong Chian School Of Business

The present study investigated whether employees are merely interested in hearing good news about themselves, as predicted by self-enhancement theory, or are more interested in feedback that confirms their self-concept, as predicted by self-verification theory. We examined in a field study whether self-view certainty serves as a moderator and strengthens the effect of congruence between individuals' self-views and the performance feedback they receive about these self-views on feedback reactions. Polynomial regression results revealed that people mainly reacted favourably to positive feedback. Prior self-views did not play a key role in explaining feedback reactions. As feedback scores were the main determinant …

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Query-Based Watermarking For Xml Data, Xuan Zhou, Hwee Hwa Pang, Kian-Lee Tan Dec 2006

Query-Based Watermarking For Xml Data, Xuan Zhou, Hwee Hwa Pang, Kian-Lee Tan

Research Collection School Of Computing and Information Systems

As increasing amount of XML data is exchanged over the internet, copyright protection of this type of data is becoming an important requirement for many applications. In this paper, we introduce a rights protection scheme for XML data based on digital watermarking. One of the main challenges for watermarking XML data is that the data could be easily reorganized by an adversary in an attempt to destroy any embedded watermark. To overcome it, we propose a query-based watermarking scheme, which creates queries to identify available watermarking capacity, such that watermarks could be recovered from reorganized data through query rewriting. The …

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Implication Of Comprehensive Income Disclosure For Future Earnings And Analysts' Forecasts, Jong-Hag Choi, Yoonseok Zang Dec 2006

Implication Of Comprehensive Income Disclosure For Future Earnings And Analysts' Forecasts, Jong-Hag Choi, Yoonseok Zang

Research Collection School Of Accountancy

This paper examines the association of comprehensive income with subsequent period net income as well as analysts’ earnings forecasts. Our results support the notion that comprehensive income is incrementally useful in predicting subsequent period changes in net income. We also document that comprehensive income is associated with analysts’ earnings forecast revisions and forecast errors. The evidence is consistent with analysts’ failure to fully utilize the information disclosed in comprehensive income. The result suggests that analysts revise their year t+1’s forecast downward when comprehensive income is smaller than net income but they do not revise the forecast upward when comprehensive income …

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The Association Between Earnings Quality And Regulatory Report Opinions In The Accounting Industry, Tracey Chunqi Zhang, Katherine Gunny Dec 2006

The Association Between Earnings Quality And Regulatory Report Opinions In The Accounting Industry, Tracey Chunqi Zhang, Katherine Gunny

Research Collection School Of Accountancy

We compare the outcome of two different information systems – self regulation versus private sector regulation – in the accounting industry. Under the Sarbanes-Oxley Act, Public Company Accounting Oversight Board (PCAOB) inspections replaced American Institute of Certified Public Accountants (AICPA) peer reviews of auditors. Peer review opinions are useful with respect to decisions about hiring and firing of auditors (Hilary and Lennox, 2005); therefore, the question remains what are the benefits of incurring the cost to replace a selfregulatory system with a private regulatory agency. We examine the usefulness of these two information systems at distinguishing earnings quality at firms …

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Escalation And De-Escalation Of Commitment To Information Systems Projects: Insights From An Approach-Avoidance Process Model, Gary Pan, Shan Ling Pan Dec 2006

Escalation And De-Escalation Of Commitment To Information Systems Projects: Insights From An Approach-Avoidance Process Model, Gary Pan, Shan Ling Pan

Research Collection School Of Accountancy

We view escalation and de-escalation of commitment as processes involving recurring instances of approach-avoidance conflict. This paper outlines an approach-avoidance process model for describing and analyzing escalation and de-escalation of commitment in information systems projects. In the model, the sequential mapping of project events is integrated with a model of approach-avoidance conflict that identifies periods of gradual evolution at two separate levels of social analysis (project and work) that are punctuated by sudden, revolutionary periods of rapid change. By conceiving the processes of commitment escalation and de-escalation as sequences of events involving approach-avoidance conflicts, researchers may develop a deeper understanding …

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Reiterated Commemoration: Hiroshima As National Trauma, Hiro Saito Dec 2006

Reiterated Commemoration: Hiroshima As National Trauma, Hiro Saito

Research Collection School of Social Sciences

This article examines historical transformations of Japanese collective memory of the atomic bombing of Hiroshima by utilizing a theoretical framework that combines a model of reiterated problem solving and a theory of cultural trauma. I illustrate how the event of the nuclear fallout in March 1954 allowed actors to consolidate previously fragmented commemorative practices into a master frame to define the postwar Japanese identity in terms of transnational commemoration of "Hiroshima." I also show that nationalization of trauma of "Hiroshima" involved a shift from pity to sympathy in structures of feeling about the event. This historical study suggests that a …

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Insider Trading And Voluntary Disclosures, Qiang Cheng, Kin Lo Dec 2006

Insider Trading And Voluntary Disclosures, Qiang Cheng, Kin Lo

Research Collection School Of Accountancy

We hypothesize that insiders strategically choose disclosure policies and the timing of their equity trades to maximize trading profits, subject to the litigation costs associated with disclosure and insider trading. Accounting for endogeneity between disclosures and trading, we find that when managers plan to purchase shares, they increase the number of bad news forecasts to reduce the purchase price. In addition, this relation is stronger for trades initiated by chief executive officers than for those initiated by other executives. Confirming this strategic behavior, we find that managers successfully time their trades around bad news forecasts, buying fewer shares beforehand and …

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A Two-Stage Realized Volatility Approach To Estimation Of Diffusion Processes With Discrete Data, Peter C. B. Phillips, Jun Yu Dec 2006

A Two-Stage Realized Volatility Approach To Estimation Of Diffusion Processes With Discrete Data, Peter C. B. Phillips, Jun Yu

Research Collection School Of Economics

This paper motivates and introduces a two-stage method of 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 developed in [Jacod, J., 1994] and [Barndorff-Nielsen, O., Shephard, N., 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 …

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Maximum Likelihood And Gaussian Estimation Of Continuous Time Models In Finance, Peter C. B. Phillips, Jun Yu Dec 2006

Maximum Likelihood And Gaussian Estimation Of Continuous Time Models In Finance, Peter C. B. Phillips, Jun Yu

Research Collection School Of Economics

This paper overviews maximum likelihood and Gaussian methods of estimating continuous time models used in finance. Since the exact likelihood can be constructed only in special cases, much attention has been devoted to the development of methods designed to approximate the likelihood. These approaches range from crude Euler-type approximations and higher order stochastic Taylor series expansions to more complex polynomial-based expansions and infill approximations to the likelihood based on a continuous time data record. The methods are discussed, their properties are outlined and their relative finite sample performance compared in a simulation experiment with the nonlinear CIR diffusion model, which …

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Multivariate Stochastic Volatility, Manabu Asai, Michael Mcaleer, Jun Yu Dec 2006

Multivariate Stochastic Volatility, Manabu Asai, Michael Mcaleer, Jun Yu

Research Collection School Of Economics

The literature on multivariate stochastic volatility (MSV) models has developed significantly over the last few years. This paper reviews the substantial literature on specification, estimation and evaluation of MSV models. A wide range of MSV models is presented according to various categories, namely (i) asymmetric models; (ii) factor models; (iii) time-varying correlation models; and (iv) alternative MSV specifications, including models based on the matrix exponential transformation, Cholesky decomposition, Wishart autoregressive process, and the empirical range. Alternative methods of estimation, including quasi-maximum likelihood, simulated maximum likelihood, Monte Carlo likelihood, and Markov chain Monte Carlo methods, are discussed and compared. Various methods …

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Formal Analysis And Systematic Construction Of Two-Factor Authentication Scheme, Guomin Yang, Duncan S. Wong, Huaxiong Wang, Xiaotie Deng Dec 2006

Formal Analysis And Systematic Construction Of Two-Factor Authentication Scheme, Guomin Yang, Duncan S. Wong, Huaxiong Wang, Xiaotie Deng

Research Collection School Of Computing and Information Systems

One of the most commonly used two-factor authentication mechanisms is based on smart card and user’s password. Throughout the years, there have been many schemes proposed, but most of them have already been found flawed due to the lack of formal security analysis. On the cryptanalysis of this type of schemes, in this paper, we further review two recently proposed schemes and show that their security claims are invalid. To address the current issue, we propose a new and simplified property set and a formal adversarial model for analyzing the security of this type of schemes. We believe that the …

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On The Lower Bound Of Local Optimums In K-Means Algorithms, Zhenjie Zhang, Bing Tian Dai, Anthony K.H. Tung Dec 2006

On The Lower Bound Of Local Optimums In K-Means Algorithms, Zhenjie Zhang, Bing Tian Dai, Anthony K.H. Tung

Research Collection School Of Computing and Information Systems

No abstract provided.

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A Typology Of Plants In Global Manufacturing Networks, Ann Vereecke, Roland Van Dierdonck, Arnoud De Meyer Nov 2006

A Typology Of Plants In Global Manufacturing Networks, Ann Vereecke, Roland Van Dierdonck, Arnoud De Meyer

Research Collection Lee Kong Chian School Of Business

The purpose of this paper is to propose a new, empirically derived typology of plants in the international manufacturing network of multinational companies. This typology is based on the knowledge flows between the plants. In our research, network analysis has been used as a methodology for understanding the position of plants in international manufacturing networks. The focus has been primarily on the intangible knowledge network, and secondarily on the physical, logistic network. Our analysis leads to four types of plants with different network roles: the isolated plants, the receivers, the hosting network players, and the active network players. Our analysis …

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Management And Self-Activity: Accounting For The Crisis In Profit-Taking, Stefano Harney Nov 2006

Management And Self-Activity: Accounting For The Crisis In Profit-Taking, Stefano Harney

Research Collection Lee Kong Chian School Of Business

The crisis in measurement identified by those working in the tradition of Italian autonomia has consequences for the critique of accounting and management. If both capitalist work and the commodity are today communicative and overtly political, a critique that merely points to these characteristics will have no transformative effect. This paper uses the Trinidadian Marxist theorist C.L.R. James’s notion of self-activity to suggest that the crisis in measurement is a symptom of the separation of work and value. The institution of forms of self-management and what might be called wars of command begin to replace the governmentality of the wage …

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Choice Of Currency By East Asia Bond Issuers, David Fernandez, Simon Klassen Nov 2006

Choice Of Currency By East Asia Bond Issuers, David Fernandez, Simon Klassen

Research Collection Lee Kong Chian School Of Business

In discussing bond markets in Asia, academics and policymakers typically begin by noting that the Asian crisis of 1997-98 in part resulted from the underdevelopment of the region’s domestic bond markets and the resultant currency and duration mismatches. When assessing the progress made in developing these markets in the post-crisis years, academics and policymakers usually observe that, while several domestic currency government bond markets have moved ahead, corporate bond markets have lagged (Asian Development Bank (2002), Reserve Bank of Australia (2003)). The policy conclusion is therefore often drawn: to prevent another Asian crisis, Asian bond markets must be further developed.

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Assimilation And Contrast Effects In Cultural Frame Switching: Bicultural Identity Integration And Valence Of Cultural Cues, Chi-Ying Cheng, Fiona Lee, Veronica Benet-Martinez Nov 2006

Assimilation And Contrast Effects In Cultural Frame Switching: Bicultural Identity Integration And Valence Of Cultural Cues, Chi-Ying Cheng, Fiona Lee, Veronica Benet-Martinez

Research Collection School of Social Sciences

This study examines how the valence of cultural cues in the environment moderates the way biculturals shift between multiple cultural identities. The authors found that when exposed to positive cultural cues, biculturals who perceive their cultural identities as compatible (high bicultural identity integration, or high BII) respond in culturally congruent ways, whereas biculturals who perceive their cultural identities as conflicting (low BII) respond in culturally incongruent ways. The opposite was true for negative cultural cues. These results show that both high and low BIIs can exhibit culturally congruent or incongruent behaviors, and have implications for understanding situations where high and …

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