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Do Accurate Earnings Forecasts Facilitate Superior Investment Recommendations?, Roger Loh, G. Mujtaba Mian May 2006

Do Accurate Earnings Forecasts Facilitate Superior Investment Recommendations?, Roger Loh, G. Mujtaba Mian

Research Collection Lee Kong Chian School Of Business

We find that analysts who issue more accurate earnings forecasts also issue more profitable stock recommendations. The average factor-adjusted return associated with the recommendations of analysts in the highest accuracy quintile exceeds the corresponding return for analysts in the lowest accuracy quintile by 1.27% per month. Our findings provide indirect empirical support for valuation models in the accounting and finance literatures (e.g., Ohlson, 1995) that emphasize the role of future earnings in predicting stock price movements. Our results also suggest that imperfectly efficient markets reward information gatherers, such as security analysts, for their costly activities in generating superior earnings forecasts.

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Guest Editorial: Mobile Technology In Education, Keng Siau, Fiona Fui-Hoon Nah May 2006

Guest Editorial: Mobile Technology In Education, Keng Siau, Fiona Fui-Hoon Nah

Research Collection School Of Computing and Information Systems

No abstract provided.

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Winning Back The Cup For Distributed Pomdps: Planning Over Continuous Belief Spaces, Pradeep Varakantham, Ranjit Nair, Milind Tambe, Makoto Yokoo May 2006

Winning Back The Cup For Distributed Pomdps: Planning Over Continuous Belief Spaces, Pradeep Varakantham, Ranjit Nair, Milind Tambe, Makoto Yokoo

Research Collection School Of Computing and Information Systems

Distributed Partially Observable Markov Decision Problems (Distributed POMDPs) are evolving as a popular approach for modeling multiagent systems, and many different algorithms have been proposed to obtain locally or globally optimal policies. Unfortunately, most of these algorithms have either been explicitly designed or experimentally evaluated assuming knowledge of a starting belief point, an assumption that often does not hold in complex, uncertain domains. Instead, in such domains, it is important for agents to explicitly plan over continuous belief spaces. This paper provides a novel algorithm to explicitly compute finite horizon policies over continuous belief spaces, without restricting the space of …

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Osprey: A Practical Type System For Validating Dimensional Unit Correctness Of C Programs, Lingxiao Jiang, Zhendong Su May 2006

Osprey: A Practical Type System For Validating Dimensional Unit Correctness Of C Programs, Lingxiao Jiang, Zhendong Su

Research Collection School Of Computing and Information Systems

Misuse of measurement units is a common source of errors in scientific applications, but standard type systems do not prevent such errors. Dimensional analysis in physics can be used to manually detect such errors in physical equations. It is, however, not feasible to perform such manual analysis for programs computing physical equations because of code complexity. In this paper, we present a type system to automatically detect potential errors involving measurement units. It is constraint-based: we model units as types and flow of units as constraints. However, standard type checking algorithms are not powerful enough to handle units because of …

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Discovering Causal Dependencies In Mobile Context-Aware Recommenders, Ghim-Eng Yap, Ah-Hwee Tan, Hwee Hwa Pang May 2006

Discovering Causal Dependencies In Mobile Context-Aware Recommenders, Ghim-Eng Yap, Ah-Hwee Tan, Hwee Hwa Pang

Research Collection School Of Computing and Information Systems

Mobile context-aware recommender systems face unique challenges in acquiring context. Resource limitations make minimizing context acquisition a practical need, while the uncertainty inherent to the mobile environment makes missing context values a major concern. This paper introduces a scalable mechanism based on Bayesian network learning in a tiered context model to overcome both of these challenges. Extensive experiments on a restaurant recommender system showed that our mechanism can accurately discover causal dependencies among context, thereby enabling the effective identification of the minimal set of important context for a specific user and task, as well as providing highly accurate recommendations even …

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Time-Dependent Semantic Similarity Measure Of Queries Using Historical Click-Through Data, Qiankun Zhao, Steven C. H. Hoi, Tie-Yan Liu, Sourav S. Bhowmick, Michael R. Lyu, Wei-Ying Ma May 2006

Time-Dependent Semantic Similarity Measure Of Queries Using Historical Click-Through Data, Qiankun Zhao, Steven C. H. Hoi, Tie-Yan Liu, Sourav S. Bhowmick, Michael R. Lyu, Wei-Ying Ma

Research Collection School Of Computing and Information Systems

It has become a promising direction to measure similarity of Web search queries by mining the increasing amount of click-through data logged by Web search engines, which record the interactions between users and the search engines. Most existing approaches employ the click-through data for similarity measure of queries with little consideration of the temporal factor, while the click-through data is often dynamic and contains rich temporal information. In this paper we present a new framework of time-dependent query semantic similarity model on exploiting the temporal characteristics of historical click-through data. The intuition is that more accurate semantic similarity values between …

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Evaluation Of Time-Varying Availability In Multi-Echelon Spare Parts Systems With Passivation, Hoong Chuin Lau, Huawei Song, Chuen Teck See, Siew Yen Cheng Apr 2006

Evaluation Of Time-Varying Availability In Multi-Echelon Spare Parts Systems With Passivation, Hoong Chuin Lau, Huawei Song, Chuen Teck See, Siew Yen Cheng

Research Collection School Of Computing and Information Systems

The popular models for repairable item inventory, both in the literature as well as practical applications, assume that the demands for items are independent of the number of working systems. However this assumption can introduce a serious underestimation of availability when the number of working systems is small, the failure rate is high or the repair time is long. In this paper, we study a multi-echelon repairable item inventory system under the phenomenon of passivation, i.e. serviceable items are passivated (“switched off”) upon system failure. This work is motivated by corrective maintenance of high-cost technical equipment in the miltary. We …

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A Practical Password-Based Two-Server Authentication And Key Exchange System, Yanjiang Yang, Robert H. Deng, Feng Bao Apr 2006

A Practical Password-Based Two-Server Authentication And Key Exchange System, Yanjiang Yang, Robert H. Deng, Feng Bao

Research Collection School Of Computing and Information Systems

Most password-based user authentication systems place total trust on the authentication server where cleartext passwords or easily derived password verification data are stored in a central database. Such systems are, thus, by no means resilient against offline dictionary attacks initiated at the server side. Compromise of the authentication server by either outsiders or insiders subjects all user passwords to exposure and may have serious legal and financial repercussions to an organization. Recently, several multiserver password systems were proposed to circumvent the single point of vulnerability inherent in the single-server architecture. However, these multiserver systems are difficult to deploy and operate …

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Efficient Client-To-Server Assignments For Distributed Virtual Environments, Nguyen Binh Duong Ta, Suiping Zhou Apr 2006

Efficient Client-To-Server Assignments For Distributed Virtual Environments, Nguyen Binh Duong Ta, Suiping Zhou

Research Collection School Of Computing and Information Systems

Distributed Virtual Environments (DVEs) are distributed systems that allow multiple geographically distributed clients (users) to interact simultaneously in a computer-generated, shared virtual world. Applications of DVEs can be seen in many areas nowadays, such as online games, military simulations, collaborative designs, etc. To support large-scale DVEs with real-time interactions among thousands or more distributed clients, a geographically distributed server architecture (GDSA) is generally needed, and the virtual world can be partitioned into many distinct zones to distribute the load among the servers. Due to the geographic distributions of clients and servers in such architectures, it is essential to efficiently assign …

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Effect Of Changing Requirements: A Tracking Mechanism For The Analysis Workflow, Subhajit Datta, Robert Van Engelen Apr 2006

Effect Of Changing Requirements: A Tracking Mechanism For The Analysis Workflow, Subhajit Datta, Robert Van Engelen

Research Collection School Of Computing and Information Systems

Managing the effects of changing requirements remains one of the greatest challenges of enterprise software development. The iterative and incremental model provides an expedient framework for addressing such concerns. This paper presents a set of metrics - Mutation Index, Component Set, Dependency Index - and a methodology to measure the effects of requirement changes in the analysis workflow from one iteration to another. Results from a sample case study are included to highlight a usage scenario. Future directions of our work based on this mechanism are also discussed.

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Employee Incentives To Make Firm Specific Investment: Implications For Resource-Based Theories Of Corporate Diversification, Heli Wang, Jay B. Barney Apr 2006

Employee Incentives To Make Firm Specific Investment: Implications For Resource-Based Theories Of Corporate Diversification, Heli Wang, Jay B. Barney

Research Collection Lee Kong Chian School Of Business

We argue that the risk associated with the value of a firm's core resources has an impact on employee decisions to make firm-specific investments, independent of the threat of opportunism that might exist in a particular exchange. We further explore mechanisms firms may adopt to mitigate the employee incentive problem stemming from the risk associated with core resource value. These arguments shed new light on resource-based theories of corporate diversification.

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A Unified Log-Based Relevance Feedback Scheme For Image Retrieval, Steven Hoi, Michael R. Lyu, Rong Jin Apr 2006

A Unified Log-Based Relevance Feedback Scheme For Image Retrieval, Steven Hoi, Michael R. Lyu, Rong Jin

Research Collection School Of Computing and Information Systems

Relevance feedback has emerged as a powerful tool to boost the retrieval performance in content-based image retrieval (CBIR). In the past, most research efforts in this field have focused on designing effective algorithms for traditional relevance feedback. Given that a CBIR system can collect and store users' relevance feedback information in a history log, an image retrieval system should be able to take advantage of the log data of users' feedback to enhance its retrieval performance. In this paper, we propose a unified framework for log-based relevance feedback that integrates the log of feedback data into the traditional relevance feedback …

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Duverger's Law And The Study Of Electoral Systems, Kenneth Benoit Apr 2006

Duverger's Law And The Study Of Electoral Systems, Kenneth Benoit

Research Collection School of Social Sciences

Since its first publication in 1951, Duverger's Political Parties has influenced an entire branch of political science devoted to the study of the political consequences of electoral laws. This essay examines the two propositions known as Duverger's law and Duverger's hypothesis, both concerned with how electoral institutions shape party systems. First explaining the propositions and their context, the essay examines their influence on political science, and concludes by assessing where future research in the area might be best concentrated.

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In Defence Of An Argument For Evans's Principle: A Rejoinder To Vahid, John N. Williams Apr 2006

In Defence Of An Argument For Evans's Principle: A Rejoinder To Vahid, John N. Williams

Research Collection School of Social Sciences

No abstract provided.

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Functional Form And Spatial Dependence In Dynamic Panels, Zhenlin Yang, Chen Wei Li, Yiu Kuen Tse Apr 2006

Functional Form And Spatial Dependence In Dynamic Panels, Zhenlin Yang, Chen Wei Li, Yiu Kuen Tse

Research Collection School Of Economics

This paper proposes a generalized dynamic error component model that simultaneously accounts for the effects of functional form and spatial dependence. Maximum likelihood method is used for model estimation and inference. An empirical illustration using the demand for cigarettes data is given.

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Forecasting The Global Electronics Cycle With Leading Indicators: A Bayesian Var Approach, Hwee Kwan Chow, Keen Meng Choy Apr 2006

Forecasting The Global Electronics Cycle With Leading Indicators: A Bayesian Var Approach, Hwee Kwan Chow, Keen Meng Choy

Research Collection School Of Economics

Developments in the global electronics industry are typically monitored by tracking indicators that span a whole spectrum of activities in the sector. However, these indicators invariably give mixed signals at each point in time, thereby hampering attempts at prediction. In this paper, we propose a unified framework for forecasting the global electronics cycle by constructing a VAR model that captures the economic interactions between putative leading indicators representing expectations, orders, inventories and prices. The ability of the indicators to presage world semiconductor sales is first examined by Granger causality tests. Subsequently, an impulse response analysis confirms the leading qualities of …

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In-Network Processing Of Nearest Neigbor Queries For Wireless Sensor Networks, Yuxia Yao, Xueyan Tang, Ee Peng Lim Apr 2006

In-Network Processing Of Nearest Neigbor Queries For Wireless Sensor Networks, Yuxia Yao, Xueyan Tang, Ee Peng Lim

Research Collection School Of Computing and Information Systems

Wireless sensor networks have been widely used for civilian and military applications, such as environmental monitoring and vehicle tracking. The sensor nodes in the network have the abilities to sense, store, compute and communicate. To enable object tracking applications, spatial queries such as nearest neighbor queries are to be supported in these networks. The queries can be injected by the user at any sensor node. Due to the limited power supply for sensor nodes, energy efficiency is the major concern in query processing. Centralized data storage and query processing schemes do not favor energy efficiency. In this paper, we propose …

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Programming Immaterial Labour, Stefano Harney Apr 2006

Programming Immaterial Labour, Stefano Harney

Research Collection Lee Kong Chian School Of Business

Language, image, and ambiance production used to go under the sign of cultural labour. Today, these increasingly gather under the banner of immaterial labour. It is this part of cultural labour, a part of cultural labour most explicitly projecting itself as labour, that I want to discuss in this article.

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Mobile Mediation: How Technology Is Driving The Globalization Of Adr, Nadja Alexander Apr 2006

Mobile Mediation: How Technology Is Driving The Globalization Of Adr, Nadja Alexander

Research Collection Yong Pung How School Of Law

Mediation has made it to Hollywood. The opening scene of the romantic comedy, The Wedding Crashers (2005), features a hilarious attempt at divorce mediation. The mediation scene does not demonstrate any mediation skills to be emulated, and the film itself, apart from the opening scene, has nothing to do with mediation. Nevertheless one cannot ignore the power of the borderless dream machine called Hollywood. The Hollywood film industry does more than export films and fantasies around the world; it is a driving force in the globalization of the themes with which it deals. When mediation becomes one of those themes …

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The Public Policy And Mandatory Rules Of Third Countries In International Contracts, Adeline Chong Apr 2006

The Public Policy And Mandatory Rules Of Third Countries In International Contracts, Adeline Chong

Research Collection Yong Pung How School Of Law

While party autonomy has risen in the field of contract, this autonomy is not unfettered. Parties are allowed to choose the governing law of the contract but limitations on party choice can be seen through the operation of public policy and mandatory rules. The public policy and mandatory rules of three laws may be imposed onto the contract: that of the lex fori, the governing law of the contract and the law of a third country with a connection to the contract. It is generally accepted that the public policy and mandatory rules of the forum have a legitimate role …

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Experimental And Empirical Perspectives On Grid Resource Allocation For The Singapore Market, Danny Oh, Steven Miller, Nan Hu Apr 2006

Experimental And Empirical Perspectives On Grid Resource Allocation For The Singapore Market, Danny Oh, Steven Miller, Nan Hu

Research Collection School Of Computing and Information Systems

In this paper, we describe our work on using the Tycoon system developed by HP Labs to provide a market-based resource allocation and bidding framework for a grid. We discuss how we intend to evaluate the feasibility of the Tycoon system by measuring its economic performance using agent-based simulation experiments for a particular type of grid usage scenario, namely, the digital media market scenario. We will also discuss a related effort in collecting and using real grid data from the National Grid Pilot Platform in Singapore and how we will be using real data collected to derive actual usage patterns …

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Sgpm: Static Group Pattern Mining Using Apriori-Like Sliding Window, John Goh, David Taniar, Ee Peng Lim Apr 2006

Sgpm: Static Group Pattern Mining Using Apriori-Like Sliding Window, John Goh, David Taniar, Ee Peng Lim

Research Collection School Of Computing and Information Systems

Mobile user data mining is a field that focuses on extracting interesting pattern and knowledge out from data generated by mobile users. Group pattern is a type of mobile user data mining method. In group pattern mining, group patterns from a given user movement database is found based on spatio-temporal distances. In this paper, we propose an improvement of efficiency using area method for locating mobile users and using sliding window for static group pattern mining. This reduces the complexity of valid group pattern mining problem. We support the use of static method, which uses areas and sliding windows instead …

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Paradoxical Impact Of Asymmetric Regulation In Taiwan's Telecommunications Industry: Restriction And Rent Seeking, Yuntsai Chou, Kung-Chung Liu Apr 2006

Paradoxical Impact Of Asymmetric Regulation In Taiwan's Telecommunications Industry: Restriction And Rent Seeking, Yuntsai Chou, Kung-Chung Liu

Research Collection Yong Pung How School Of Law

The mobile penetration rate in Taiwan has climbed from 6.86 to 112.15. Mobile phone accounts per 100 capita in the first 6 years of market competition, during this time the state-owned incumbent Chunghua Telecom has been dethroned by a new entrant, Taiwan Cellular Corp. This paper addresses the cause of Taiwan's unprecedented mobile growth, and provides policy solutions for countries that strive to improve their telecommunications sectors in a short time scale. The authors highlight the fundamental role of asymmetric regulation, rather than pure liberalization, in the creation of the deregulated telecommunications industry in Taiwan. The asymmetric regulation in Taiwan …

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Enterprise Agility And The Enabling Role Of Information Technology, Eric Overby, Anandhi S. Bharadwaj, V. Sambamurthy Apr 2006

Enterprise Agility And The Enabling Role Of Information Technology, Eric Overby, Anandhi S. Bharadwaj, V. Sambamurthy

Research Collection School Of Computing and Information Systems

In turbulent environments, enterprise agility, that is, the ability of firms to sense environmental change and respond readily, is an important determinant of firm success. We define and deconstruct enterprise agility, delineate enterprise agility from similar concepts in the business research literature, explore the underlying capabilities that support enterprise agility, explicate the enabling role of information technology (IT) and digital options, and propose a method for measuring enterprise agility. The concepts in this paper are offered as foundational building blocks for the overall research program on enterprise agility and the enabling role of IT.

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Anonymous Signature Schemes, Guomin Yang, Duncan S. Wong, Xiaotie Deng, Huaxiong Wang Apr 2006

Anonymous Signature Schemes, Guomin Yang, Duncan S. Wong, Xiaotie Deng, Huaxiong Wang

Research Collection School Of Computing and Information Systems

Digital signature is one of the most important primitives in public key cryptography. It provides authenticity, integrity and non-repudiation to many kinds of applications. On signer privacy however, it is generally unclear or suspicious of whether a signature scheme itself can guarantee the anonymity of the signer. In this paper, we give some affirmative answers to it. We formally define the signer anonymity for digital signature and propose some schemes of this type. We show that a signer anonymous signature scheme can be very useful by proposing a new anonymous key exchange protocol which allows a client Alice to establish …

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Fisa: Feature-Based Instance Selection For Imbalanced Text Classification, Aixin Sun, Ee Peng Lim, Boualem Benatallah, Mahbub Hassan Apr 2006

Fisa: Feature-Based Instance Selection For Imbalanced Text Classification, Aixin Sun, Ee Peng Lim, Boualem Benatallah, Mahbub Hassan

Research Collection School Of Computing and Information Systems

Support Vector Machines (SVM) classifiers are widely used in text classification tasks and these tasks often involve imbalanced training. In this paper, we specifically address the cases where negative training documents significantly outnumber the positive ones. A generic algorithm known as FISA (Feature-based Instance Selection Algorithm), is proposed to select only a subset of negative training documents for training a SVM classifier. With a smaller carefully selected training set, a SVM classifier can be more efficiently trained while delivering comparable or better classification accuracy. In our experiments on the 20-Newsgroups dataset, using only 35% negative training examples and 60% learning …

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Searching Substructures With Superimposed Distance, Xifeng Yan, Feida Zhu, Jiawei Han, Philip S. Yu Apr 2006

Searching Substructures With Superimposed Distance, Xifeng Yan, Feida Zhu, Jiawei Han, Philip S. Yu

Research Collection School Of Computing and Information Systems

Efficient indexing techniques have been developed for the exact and approximate substructure search in large scale graph databases. Unfortunately, the retrieval problem of structures with categorical or geometric distance constraints is not solved yet. In this paper, we develop a method called PIS (Partition-based Graph Index and Search) to support similarity search on substructures with superimposed distance constraints. PIS selects discriminative fragments in a query graph and uses an index to prune the graphs that violate the distance constraints. We identify a criterion to distinguish the selectivity of fragments in multiple graphs and develop a partition method to obtain a …

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Is It All A Question Of Openness?, Seow Hon Tan Mar 2006

Is It All A Question Of Openness?, Seow Hon Tan

Research Collection Yong Pung How School Of Law

No abstract provided.

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Industry Leaders Debate Big Pharma R&D (Too Little Hope?) And Stem Cell Research (Too Much Hype?), Knowledge@Smu Mar 2006

Industry Leaders Debate Big Pharma R&D (Too Little Hope?) And Stem Cell Research (Too Much Hype?), Knowledge@Smu

Knowledge@SMU

Different points on the research spectrum were under the microscope at the Wharton Health Care Business Conference last month as two panels of biotech, pharmaceutical and investment leaders discussed the state of R&D among big pharmaceuticals and the progress of stem cell research. While disappointing results in both sectors have dominated the news lately, panelists at each session also noted some promising developments -- and causes for optimism -- in their respective fields.

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Smu's Li Ka Shing Library Celebrates Its Official Opening, Ruth A. Pagell Mar 2006

Smu's Li Ka Shing Library Celebrates Its Official Opening, Ruth A. Pagell

Research Collection Library

It is not often that a city gets to celebrate the opening of two modern, exciting new libraries located within blocks of each other within the same month. At the end of July 2005, the Li Ka Shing Library of the Singapore Management University opened its doors to its first group of students and faculty, a month after ACCESS covered the soft opening of the National Library of Singapore, just a ten minute walk away. Both of these modern, innovative structures are within the heart of Singapore's Arts, Culture, Learning and Entertainment hub.

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