Digital Commons Network^™

Text Mining In Radiology Reports, Tianxia Gong, Chew Lim Tan, Tze-Yun Leong, Cheng Kiang Lee, Boon Chuan Pang, C. C. Tchoyoson Lim, Qi Tian, Suisheng Tang, Zhuo Zhang

Research Collection School Of Computing and Information Systems

Medical text mining has gained increasing interest in recent years. Radiology reports contain rich information describing radiologist's observations on the patient's medical conditions in the associated medical images. However as most reports are in free text format, the valuable information contained in those reports cannot be easily accessed and used, unless proper text mining has been applied. In this paper we propose a text mining system to extract and use the information in radiology reports. The system consists of three main modules: a medical finding extractor a report and image retriever and a text-assisted image feature extractor In evaluation, the …

Financial Risk Management: Lessons From The Current Crisis ... So Far, Knowledge@Smu

Knowledge@SMU

The current economic recovery looks long and difficult, and makes providing for an ageing population an even greater challenge. Will economies rebound to provide for the health care needs of retirees? At a conference organised in November 2008 by the Sim Kee Boon Institute’s newly launched Center for Silver Security at the Singapore Management University, Todd Groome of the International Monetary Fund spoke on how the ongoing financial crisis could shape retirement risk.

Dealing With 'Messy Policy Problems' In The Health Care Sector, Knowledge@Smu

Knowledge@SMU

In his new book, Dealing with Messy Policy Problems, to be published in April 2009, political science professor Steven Ney of the Singapore Management University offers insights on how to make sense of complex, messy and often overlapping policy problems. Ney contends that having conflicts is a necessary part of the process of finding solutions to complex policy issues. He spoke to Knowledge@SMU on policy issues relating to the crisis in global health care. --------------------------------------------------------------------------------

Sovereign Wealth Funds: Mind The Gapp (Generally Accepted Principles And Practices)!, Knowledge@Smu

Knowledge@SMU

The ongoing credit crisis has thrown the spotlight onsovereign wealth funds (SWFs). “The size and activities of SWFs in recent years have led to heightened attention on, and suspicion about them,” commented Locknie Hsu, Singapore Management University professor who specialises in international trade and dispute settlement law. Hsu recently authored a commentary on the new set of voluntary principles, known as the ‘Santiago Principles’ or GAPP (Generally Accepted Principles and Practices), adopted and released in October 2008 to govern such funds.

Voting And Campaign Contributions: Greater Inequality, Lesser Redistribution?, Knowledge@Smu

Knowledge@SMU

The recent US presidential elections saw unprecedented levels of campaign funds raised and spent. Filipe Campante, public policy professor at the John F. Kennedy School of Government at Harvard University, presented a paper on “Redistribution in a model of voting and campaign contributions”, as part of a seminar series at the Singapore Management University’s School of Economics.

Decision Support Models For Movies: Making Science Out Of An Art, Knowledge@Smu

Knowledge@SMU

Can movie exhibitors, distributors and producers predict box office earnings apart from opening numbers, some good hunches, and a lot of luck? At a recent seminar on ‘Researching the Entertainment Industry’ at the Singapore Management University, Josh Eliashberg, Wharton professor of marketing and operations and information management, presented a set of decision support tools developed with an international team of researchers, which could help “to make a science out of an art”.

Profit Or Growth: Can Singapore's Building And Construction Industry Attain Both?, Knowledge@Smu

Knowledge@SMU

Singapore’s building and construction industry accounts for about 4% of gross domestic product. Working closely with the country's Building and Construction Authority (BCA), the Singapore Management University (SMU) recently launched a SMU-BCA advanced joint management programme to develop strategic management capabilities of senior executives in the sector. Six panelists comprising industry leaders participated afterwards in a discussion on “Profit or Growth – How to Attain Both”, moderated by SMU’s dean of executive and professional education, Annie Koh.

Marketing And Librarians, Pin Pin Yeo

Research Collection Library

Barbie Keiser, Information Resource Management Consultant, conducted a one day workshop titled “Substance beyond style: Marketing library and information services in the 21st century” in Singapore on 15 October. The workshop was organized by the Library Association of Singapore and the Singapore Management University. It was held at the Reading Room, Li Ka Shing Library, Singapore Management University. Ms. Keiser noted that she did her first marketing workshop in Singapore in 1989 and was pleased to be back twenty years later.

Over S$17 Million Raised For The Sim Kee Boon Institute For Financial Economics At Singapore Management University, Singapore Management University

SMU Press Releases

No abstract provided.

Global Analysis Of An Expectations Augmented Evolutionary Dynamics, Angelo Antoci, Antonio Gay, Massimiliano Landi, Pier Luigi Sacco

Research Collection School Of Economics

We consider a deterministic evolutionary model where players form expectations about future play. Players are not fully rational and have expectations that change over time in response to current payoffs and feedback from the past. We provide a complete characterization of the qualitative dynamics so induced for a two strategy population game, and relate our findings to standard evolutionary dynamics and equilibrium selection when agents have rational forward looking expectations.

On Visualizing Heterogeneous Semantic Networks From Multiple Data Sources, Maureen Maureen, Aixin Sun, Ee Peng Lim, Anwitaman Datta, Kuiyu Chang

Research Collection School Of Computing and Information Systems

In this paper, we focus on the visualization of heterogeneous semantic networks obtained from multiple data sources. A semantic network comprising a set of entities and relationships is often used for representing knowledge derived from textual data or database records. Although the semantic networks created for the same domain at different data sources may cover a similar set of entities, these networks could also be very different because of naming conventions, coverage, view points, and other reasons. Since digital libraries often contain data from multiple sources, we propose a visualization tool to integrate and analyze the differences among multiple social …

Robust Regularized Kernel Regression, Jianke Zhu, Steven C. H. Hoi, Michael R. Lyu

Research Collection School Of Computing and Information Systems

Robust regression techniques are critical to fitting data with noise in real-world applications. Most previous work of robust kernel regression is usually formulated into a dual form, which is then solved by some quadratic program solver consequently. In this correspondence, we propose a new formulation for robust regularized kernel regression under the theoretical framework of regularization networks and then tackle the optimization problem directly in the primal. We show that the primal and dual approaches are equivalent to achieving similar regression performance, but the primal formulation is more efficient and easier to be implemented than the dual one. Different from …

Explaining Inferences In Bayesian Networks, Ghim-Eng Yap, Ah-Hwee Tan, Hwee Hwa Pang

Research Collection School Of Computing and Information Systems

While Bayesian network (BN) can achieve accurate predictions even with erroneous or incomplete evidence, explaining the inferences remains a challenge. Existing approaches fall short because they do not exploit variable interactions and cannot account for compensations during inferences. This paper proposes the Explaining BN Inferences (EBI) procedure for explaining how variables interact to reach conclusions. EBI explains the value of a target node in terms of the influential nodes in the target's Markov blanket under specific contexts, where the Markov nodes include the target's parents, children, and the children's other parents. Working back from the target node, EBI shows the …

Reasonable Suspicion Or Real Likelihood: A Question Of Semantics? Re Shankar Alan S/O Anant Kulkarni, Lionel Leo, Siyuan Chen

Research Collection Yong Pung How School Of Law

The law on apparent bias has been mired in some controversy following the High Court decision of Re Shankar Alan s/o Anant Kulkarni, where Sundaresh Menon J.C. seemingly departed from the tentative views of Andrew Phang J.C. (as he then was) in Tang Kin Hwa v. Traditional Chinese Medicine Practitioners Board on the issue of whether there were any material differences between the “reasonable suspicion of bias” test and the “real likelihood of bias” test, the two formulations of the test for apparent bias that have been variously adopted by different jurisdictions in the common law world. In Tang Kin …

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 …

Distributing Complementary Resources Across Multiple Periods With Stochastic Demand, Shih-Fen Cheng, John Tajan, Hoong Chuin Lau

Research Collection School Of Computing and Information Systems

In this paper, we evaluate whether the robustness of a market mechanism that allocates complementary resources could be improved through the aggregation of time periods in which resources are consumed. In particular, we study a multi-round combinatorial auction that is built on a general equilibrium framework. We adopt the general equilibrium framework and the particular combinatorial auction design from the literature, and we investigate the benefits and the limitation of time-period aggregation when demand-side uncertainties are introduced. By using simulation experiments, we show that under stochastic conditions the performance variation of the process decreases as the time frame length (time …

Planning With Ifalcon: Towards A Neural-Network-Based Bdi Agent Architecture, Budhitama Subagdja, Ah-Hwee Tan

Research Collection School Of Computing and Information Systems

This paper presents iFALCON, a model of BDI (beliefdesire-intention) agents that is fully realized as a selforganizing neural network architecture. Based on multichannel network model called fusion ART, iFALCON is developed to bridge the gap between a self-organizing neural network that autonomously adapts its knowledge and the BDI agent model that follows explicit descriptions. Novel techniques called gradient encoding are introduced for representing sequences and hierarchical structures to realize plans and the intention structure. This paper shows that a simplified plan representation can be encoded as weighted connections in the neural network through a process of supervised learning. A case …

Trust And Satisfaction, Two Stepping Stones For Successful E-Commerce Relationships: A Longitudinal Exploration, Dan J. Kim, Donald L. Ferrin, H. Raghav Rao

Research Collection Lee Kong Chian School Of Business

Trust and satisfaction are essential ingredients for successful business relationships in business-to-consumer electronic commerce. Yet there is little research on trust and satisfaction in e-commerce that takes a longitudinal approach. Drawing on three primary bodies of literature, the theory of reasoned action, the extended valence framework, and expectation-confirmation theory, this study synthesizes a model of consumer trust and satisfaction in the context of e-commerce. The model considers not only how consumers formulate their prepurchase decisions, but also how they form their long-term relationships with the same website vendor by comparing their prepurchase expectations to their actual purchase outcome. The results …

Efficient Client-To-Client Password Authenticated Key Exchange, Yanjiang Yang, Feng Bao, Robert H. Deng

Research Collection School Of Computing and Information Systems

With the rapid proliferation of client-to-client applications, PAKE (password authenticated key exchange) protocols in the client-to-client setting become increasingly important. In this paper, we propose an efficient client-to client PAKE protocol, which has much better performance than existing generic constructions. We also show that the proposed protocol is secure under a formal security model.

Saving The Wto From The Risk Of Irrelevance: The Wto Dispute Settlement Mechanism As A ‘Common Good’ For Rta Disputes, Henry Gao, Chin Leng Lim

Research Collection Yong Pung How School Of Law

Over the past few decades, Regional Trade Agreements (RTAs) have proliferated globally. Such proliferation of RTAs created a renewed sense of urgency for the WTO to take action in order to avoid the fate of being eclipsed into irrelevance. There are several options for coping with the challenge. Theoretically speaking, the best approach would be to heighten the level of ambition in global trade talks to reduce all trade barriers to zero so that the discriminatory effect created by RTAs could be reduced or even eliminated. In reality, such an approach would be impossible for well-known reasons. The next best …

Bystanders' Reactions Towards Co-Punishment Events In The Taiwanese Military: Examining The Moderating Effects Of Organizational Norms, Shu-Cheng S. Chi, Hsin-Hsin Lo, Tsai Ming-Hong, Brian P. Niehoff

Research Collection School of Social Sciences

The present study examined bystanders' justice perceptions about co-punishment events. In a sample of 169 logistic officers in the Taiwanese military, responsibility attributions (i.e. liability attributed to co-punished persons) had a negative relationship with perceived harshness, and a positive relationship with perceived procedural justice. In addition, the effects of responsibility attributions on procedural justice were weaker if the person perceived stronger rather than weaker organizational norms of co-punishment.

Threat-Balancing In Vendor Transition, Cecil Eng Huang Chua, Wee Kiat Lim, Siew Kien Sia, Christina Soh

CMP Research

While many outsourcing contracts are expiring, and vendor transition is becoming an increasing concern, little research helps organizations manage vendor transition. This paper explores vendor transition across two case sites. In one case, the outgoing vendor cooperated with the client which resulted in the client distancing itself from interactions between vendors. In the second case, the outgoing vendor was openly hostile, with the result that the client allied with the incoming vendor to manage vendor transition. These findings mirror expectations from balance of threat theory, a political science theory about interactions between nations. Balance of threat theory predicts that outgoing …

Managerial Ownership, Corporate Monitoring And Audit Pricing, Soongsoo Han, Julia Higgs, Tony Kang

Research Collection School Of Accountancy

We study whether managerial ownership and corporate monitoring (board quality and analyst coverage) relate to audit pricing. Managerial ownership has been identified as a fraud risk factor under SAS 99. However, the role of ownership is not clear. Under an alignment view, high levels of stock ownership align management with shareholders. Under an entrenchment view, high levels of ownership may motivate management to be self interested. Corporate monitoring, as measured by analyst coverage and overall board quality (Gomper’s index), are associated with information quality. Audit pricing will be affected to the extent that auditors perceive monitoring as being relevant to …

Managerial Ownership And Firms' Information Environment, Soongsoo Han, Tony Kang, Gerald Lobo

Research Collection School Of Accountancy

We examine the relation between managerial stock ownership and the firm’s information environment. We focus on three dimensions of the information environment: total, public, and private information precision (Barron, Kim, Lim and Stevens 1998). Our results suggest that firms’ total and public information precision are positively related to managerial ownership. In contrast, there is no clear pattern in private information precision across different levels of managerial ownership. We also observe that managerial ownership has a greater impact on the firm’s public information environment after the implementation of Regulation Fair Disclosure, suggesting that the regulation was effective in improving the firms’ …

Profitability Analysis Of Chinese Listed Firms: 1992-2004, Jianjun Niu, Heng Yue, Guohua Jiang

Research Collection School Of Accountancy

This research collects and analyses the profitability data of Chineselisted companies from 1992 to 2004. Results show that, on average, theprofitability of Chinese listed companies has declined over the period. Post-IPOearnings also exhibit a downward trend. A further analysis reveals that changes inlisted firms’ profitability ratio follow a strong mean reversion pattern.

Innovation In The Programmable Web: Characterizing The Mashup Ecosystem, C. Jason Woodard, Shuli Yu

Research Collection School Of Computing and Information Systems

This paper investigates the structure and dynamics of the Web 2.0 software ecosystem by analyzing empirical data on web service APIs and mashups. Using network analysis tools to visualize the growth of the ecosystem from December 2005 to 2007, we find that the APIs are organized into three tiers, and that mashups are often formed by combining APIs across tiers. Plotting the cumulative distribution of mashups to APIs reveals a power-law relationship, although the tail is short compared to previously reported distributions of book and movie sales. While this finding highlights the dominant role played by the most popular APIs …

Customer Satisfaction Index Of Singapore: The Singapore Management University Subscription Report 2008, Institute Of Service Excellence, Smu

Research Collection Institute of Service Excellence

The Institute of Service Excellence at Singapore Management University (ISES) was appointed by the Singapore Workforce Development Agency (WDA) to implement and maintain an annual benchmark for the services sector in Singapore.

The Customer Satisfaction Index of Singapore (CSISG) was first launched in April 2008 based on data collected from a nationwide survey conducted in 2007. The CSISG is modeled after the American Customer Satisfaction Index (ACSI) developed by the University of Michigan in 1994.

In this second year, CSISG 2008 produced satisfaction indices for 88 companies from 35 sub-sectors, cutting across 8 services sectors, namely Education, Finance & Insurance …

How Surprising Are Returns In 2008? A Review Of Hedge Fund Risks, Melvyn Teo

Research Collection BNP Paribas Hedge Fund Centre

Many investors, expecting absolute returns, were shocked by the dismal performance of various hedge fund investment strategies in 2008. In this issue of the statistical digest, I review the academic literature on hedge fund risks and conduct some simple analyses. I find that many hedge funds, even those without directional equity exposure, have payoffs that resemble those from writing put options on equity indices. A central theme is that their strategies all involve being short liquidity. Therefore, these hedge funds tend to underperform during liquidity crises, which coincide with extreme bear markets.

Scaling Up Multi-Agent Reinforcement Learning In Complex Domains, Dan Xiao, Ah-Hwee Tan

Research Collection School Of Computing and Information Systems

TD-FALCON (Temporal Difference - Fusion Architecture for Learning, COgnition, and Navigation) is a class of self-organizing neural networks that incorporates Temporal Difference (TD) methods for real-time reinforcement learning. In this paper, we present two strategies, i.e. policy sharing and neighboring-agent mechanism, to further improve the learning efficiency of TD-FALCON in complex multi-agent domains. Through experiments on a traffic control problem domain and the herding task, we demonstrate that those strategies enable TD-FALCON to remain functional and adaptable in complex multi-agent domains

Ambiguous Optimistic Fair Exchange, Qiong Huang, Guomin Yang, Duncan S. Wong, Willy Susilo

Research Collection School Of Computing and Information Systems

Optimistic fair exchange (OFE) is a protocol for solving the problem of exchanging items or services in a fair manner between two parties, a signer and a verifier, with the help of an arbitrator which is called in only when a dispute happens between the two parties. In almost all the previous work on OFE, after obtaining a partial signature from the signer, the verifier can present it to others and show that the signer has indeed committed itself to something corresponding to the partial signature even prior to the completion of the transaction. In some scenarios, this capability given …