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Towards A Theoretical Framework Of Information Systems Development Success, Y. Long, Keng Siau, M. Ling
Towards A Theoretical Framework Of Information Systems Development Success, Y. Long, Keng Siau, M. Ling
Research Collection School Of Computing and Information Systems
Information systems development (ISD) is a complicated process involving interconnected resources, objects, and outcomes. The importance of ISD has attracted long-term interests from both researchers and practitioners. Based on the input-process-output model, this paper developed a conceptual framework of ISD success through a systematic literature review. The paper argues that ISD is a comprehensive and interactive process among individuals, teams, and organization. These factors impact ISD process, and further affect ISD success.
A Semiotics View Of Modeling Method Complexity – The Case Of Uml, Keng Siau, Y. Tian
A Semiotics View Of Modeling Method Complexity – The Case Of Uml, Keng Siau, Y. Tian
Research Collection School Of Computing and Information Systems
Unified Modeling Language (UML) is the standard modeling language for object oriented system development. Despite its status as a standard, UML’s formal specification is fuzzy and its theoretical foundation is weak. Semiotics, the study of signs, provides us good theoretical foundation for UML research as UML graphical notations are some kinds of signs. In this research, we use semiotics to study the graphical notations in UML. We hypothesized that using iconic signs as UML graphical notations leads to more accurate representation and arouses fewer connotations than using symbolic signs. Since symbolic signs involve more learning efforts, we assume that expert …
Web Mining - The Ontology Approach, Ee Peng Lim, Aixin Sun
Web Mining - The Ontology Approach, Ee Peng Lim, Aixin Sun
Research Collection School Of Computing and Information Systems
The World Wide Web today provides users access to extremely large number of Web sites many of which contain information of education and commercial values. Due to the unstructured and semi-structured nature of Web pages and the design idiosyncrasy of Web sites, it is a challenging task to develop digital libraries for organizing and managing digital content from the Web. Web mining research, in its last 10 years, has on the other hand made significant progress in categorizing and extracting content from the Web. In this paper, we represent ontology as a set of concepts and their inter-relationships relevant to …
Profiting From Mean-Reverting Yield Curve Trading Strategies, Choong Tze Chua, Winston T. H. Koh, Krishna Ramaswamy
Profiting From Mean-Reverting Yield Curve Trading Strategies, Choong Tze Chua, Winston T. H. Koh, Krishna Ramaswamy
Research Collection Lee Kong Chian School Of Business
A large class of fixed income trading strategies focuses on opportunities offered by the interest rate term structure. This paper studies a set of yield curve trading strategies that are based on the view that the yield curve mean-reverts to an unconditional curve. These mean-reverting trading strategies exploit deviations in the level, slope and curvature of the yield curve from historical norms. We consider cash-neutral trades with one-month holding periods. Some mean-reverting strategies were found to be highly profitable, and outperform, on a risk-adjusted basis before transaction costs, alternative strategies of an investment in the Lehman Brothers Bond index (by …
Implied Measures Of Relative Fund Performance, Steve Hogan, Mitchell Craig Warachka
Implied Measures Of Relative Fund Performance, Steve Hogan, Mitchell Craig Warachka
Research Collection Lee Kong Chian School Of Business
We evaluate the relative performance of funds by conditioning their returns on the cross-section of portfolio characteristics across fund managers. Our implied procedure circumvents the need to specify benchmark returns or peer funds. Instead, fund-specific benchmarks for measuring selection and market timing ability are constructed. This technique is robust to herding as well as window dressing and mitigates survivorship bias. Empirically, the conditional information contained in portfolio weights defined by industry sectors, assets and geographical regions is critically important to the assessment of fund management. For each set of portfolio characteristics, we identify funds with success at either selecting securities …
Too Little Or Too Much? Reexamining The Relationship Between Corporate Charitable Giving And Corporate Financial Performance, Heli Wang, Jaepil Choi, Jiatao Li
Too Little Or Too Much? Reexamining The Relationship Between Corporate Charitable Giving And Corporate Financial Performance, Heli Wang, Jaepil Choi, Jiatao Li
Research Collection Lee Kong Chian School Of Business
How do corporate charitable contributions affect corporate financial performance? Instrumental stakeholder theory posits that corporate giving can lead to high levels of corporate financial performance through improved stakeholder relations. In contrast, agency theory suggests that corporate giving diverts valuable corporate resources and inhibits corporate financial performance. Extant empirical studies that have examined the relationship found inconclusive results. We depart from and extend the existing literature in two main aspects. First, building upon the instrumental stakeholder argument and agency perspective, we develop the argument that there is an inverse U-shaped relationship between corporate charitable giving and corporate financial performance. Second, we …
Protection For Sale Under Monopolistic Competition, Pao Li Chang
Protection For Sale Under Monopolistic Competition, Pao Li Chang
Research Collection School Of Economics
This paper proposes a general empirical framework to estimate the protection-for-sale model, where the protection regime shifts according to a sector's market structure (perfectly or monop-olistically competitive). We base the protection structure on Grossman and Helpman (1994) for the subset of perfectly competitive sectors and on Chang (2005) for the subset of monop- olistically competitive sectors. The two protection regimes are simultaneously estimated with joint constraints. The results of the J-test consistently reject the homogeneous (perfect compe- tition) protection-for-sale model often adopted in previous literature and suggest a direction of improvement toward the proposed heterogeneous protection structure model.
The 2004 Global Labour Survey: Working Institution And Practices Around The World, Davin Chor, Richard B. Freeman
The 2004 Global Labour Survey: Working Institution And Practices Around The World, Davin Chor, Richard B. Freeman
Research Collection School Of Economics
The 2004 Global Labor Survey (GLS) is an Internet-based survey that seeks to measure de facto labor practices in countries around the world, covering issues such as freedom of association, the regulation of work contracts, employee benefits and the prevalence of collective bargaining. To find out about de facto practices, the GLS invited labor practitioners, ranging from union officials and activists to professors of labor law and industrial relations, to report on conditions in their country. Over 1,500 persons responded, which allowed us to create indices of practices in ten broad areas for 33 countries. The GLS' focus on de …
A Dynamic Model For The Forward Curve, Choong Tze Chua, Foster Dean, Krishna Ramaswamy, Robert Stine
A Dynamic Model For The Forward Curve, Choong Tze Chua, Foster Dean, Krishna Ramaswamy, Robert Stine
Research Collection Lee Kong Chian School Of Business
This paper develops and estimates a dynamic arbitrage-free model for the current forward curve as the sum of (i) an unconditional component, (ii) a maturity-specific component and (iii) a date-specific component. The model combines features of the Preferred Habitat model,the Expectation Hypothesis and affine yield curve models. We show how to construct alternative parametric examples of the three components from a sum of exponential functions, verify that the resulting forward curves satisfy the Heath-Jarrow-Morton conditions, and derive the risk-neutral dynamics for the purpose of pricing interest rate derivatives. We select a model from alternative affine examples that are fitted to …
Wmxml: A System For Watermarking Xml Data, Xuan Zhou, Hwee Hwa Pang, Kian-Lee Tan, Dhruv Mangla
Wmxml: A System For Watermarking Xml Data, Xuan Zhou, Hwee Hwa Pang, Kian-Lee Tan, Dhruv Mangla
Research Collection School Of Computing and Information Systems
As increasing amount of data is published in the form of XML, copyright protection of XML data is becoming an important requirement for many applications. While digital watermarking is a widely used measure to protect digital data from copyright offences, the complex and flexible construction of XML data poses a number of challenges to digital watermarking, such as re-organization and alteration attacks. To overcome these challenges, the watermarking scheme has to be based on the usability of data and the underlying semantics like key attributes and functional dependencies. In this paper, we describe WmXML, a system for watermarking XML documents. …
Estimating Party Policy Positions: Japan In Comparative Context, Michael Laver, Kenneth Benoit
Estimating Party Policy Positions: Japan In Comparative Context, Michael Laver, Kenneth Benoit
Research Collection School of Social Sciences
This paper first reviews a number of epistemological and methodological issues relating to the estimation of party policy positions, particularly in a comparative context, with special reference to the methodology of ‘expert surveys’. It is argued that expert surveys, as systematic summaries of the views of country specialists, have a particular role in assessing the content validity of other types of estimates of party policy positions. The paper moves on to analyze the positions of Japanese political parties in a comparative context, using results from a new 47-country expert survey. Attention is paid both to the substantive policy content of …
Tuning Tabu Search Strategies Via Visual Diagnosis, Steven Halim, Wee Chong Wan, Hoong Chuin Lau
Tuning Tabu Search Strategies Via Visual Diagnosis, Steven Halim, Wee Chong Wan, Hoong Chuin Lau
Research Collection School Of Computing and Information Systems
While designing working metaheuristics can be straightforward, tuning them to solve the underlying combinatorial optimization problem well can be tricky. Several tuning methods have been proposed but they do not address the new aspect of our proposed classification of the metaheuristic tuning problem: tuning search strategies. We propose a tuning methodology based on Visual Diagnosis and a generic tool called Visualizer for Metaheuristics Development Framework(V-MDF) to address specifically the problem of tuning search (particularly Tabu Search) strategies. Under V-MDF, we propose the use of a Distance Radar visualizer where the human and computer can collaborate to diagnose the occurrence of …
Geogdl: A Web-Based Approach To Geography Examination, Ee Peng Lim, Dion Hoe-Lian Goh, Yin-Leng Theng
Geogdl: A Web-Based Approach To Geography Examination, Ee Peng Lim, Dion Hoe-Lian Goh, Yin-Leng Theng
Research Collection School Of Computing and Information Systems
The traditional educational approach with students as passive recipients has been the subject of criticism. A constructivist learner-centered approach towards education has been argued to produce greater internalization and application of knowledge compared to the traditional teacher-centered, transmission-oriented approach. Nevertheless, contemporary instructional design models argue for the use and integration of both approaches especially in complex learning tasks. This paper describes GeogDL, a Web-based application developed above a digital library of geographical resources for Singapore students preparing to take a national examination in geography. GeogDL is unique in that it not only provides an environment for active learning, it also …
Privacy Issues In The Era Of Ubiquitous Commerce, Holtjona Galanxhi, Fiona Fui-Hoon Nah
Privacy Issues In The Era Of Ubiquitous Commerce, Holtjona Galanxhi, Fiona Fui-Hoon Nah
Research Collection School Of Computing and Information Systems
The vision of ubiquitous commerce (u‐commerce) is realized through the convergence of electronic, mobile, television, voice and silent commerce applications. The ubiquity, universality, uniqueness and unison of u‐commerce will provide two principal benefits for individual users and businesses: increased convenience as well as more personalized and customized services. However, u‐commerce will also bring emerging issues such as a greater degree of privacy concerns that will impact individual users, companies and society at large. This paper proposes and elaborates on a conceptual framework for privacy in the u‐commerce era. This framework is developed based on Lessig's macro‐level perspective and Adams' micro‐level …
Translation Initiation Sites Prediction With Mixture Gaussian Models In Human Cdna Sequences, G. Li, Tze-Yun Leong, Louxin Zhang
Translation Initiation Sites Prediction With Mixture Gaussian Models In Human Cdna Sequences, G. Li, Tze-Yun Leong, Louxin Zhang
Research Collection School Of Computing and Information Systems
Translation initiation sites (TISs) are important signals in cDNA sequences. Many research efforts have tried to predict TISs in cDNA sequences. In this paper, we propose to use mixture Gaussian models for TIS prediction. Using both local features and some features generated from global measures, the proposed method predicts TISs with a sensitivity of 98 percent and a specificity of 93.6 percent. Our method outperforms many other existing methods in sensitivity while keeping specificity high. We attribute the improvement in sensitivity to the nature of the global features and the mixture Gaussian models. © 2005 IEEE.
Report Of The Law Reform Committee On Pre- And Post-Judgement Interest, Tiong Min Yeo, Wai Yee Wan, Joyce Chao, Julie Huan, Vincent Leow, Sriram Chakravarthi
Report Of The Law Reform Committee On Pre- And Post-Judgement Interest, Tiong Min Yeo, Wai Yee Wan, Joyce Chao, Julie Huan, Vincent Leow, Sriram Chakravarthi
Research Collection Yong Pung How School Of Law
No abstract provided.
Strategic Assessment Of Information Security Maturity, Arcot Desai Narasimhalu, Dayasindhu Nagarajan, Raghavan Subramanian
Strategic Assessment Of Information Security Maturity, Arcot Desai Narasimhalu, Dayasindhu Nagarajan, Raghavan Subramanian
Research Collection School Of Computing and Information Systems
CXOs are becoming increasingly interested in the information security maturity of their enterprises. This paper presents a CXO dashboard that will allow better management of the information security resources in an enterprise.
Emd-Based Video Clip Retrieval By Many-To-Many Matching, Yuxin Peng, Chong-Wah Ngo
Emd-Based Video Clip Retrieval By Many-To-Many Matching, Yuxin Peng, Chong-Wah Ngo
Research Collection School Of Computing and Information Systems
This paper presents a new approach for video clip retrieval based on Earth Mover's Distance (EMD). Instead of imposing one-to-one matching constraint as in [11, 14], our approach allows many-to-many matching methodology and is capable of tolerating errors due to video partitioning and various video editing effects. We formulate clip-based retrieval as a graph matching problem in two stages. In the first stage, to allow the matching between a query and a long video, an online clip segmentation algorithm is employed to rapidly locate candidate clips for similarity measure. In the second stage, a weighted graph is constructed to model …
Deposit-Case Attack Against Secure Roaming, Guomin Yang, Duncan S. Wong, Xiaotie Deng
Deposit-Case Attack Against Secure Roaming, Guomin Yang, Duncan S. Wong, Xiaotie Deng
Research Collection School Of Computing and Information Systems
A secure roaming protocol involves three parties: a roaming user, a visiting foreign server and the user’s home server. The protocol allows the user and the foreign server to establish a session key and carry out mutual authentication with the help of the home server. In the mutual authentication, user authentication is generally done in two steps. First, the user claims that a particular server is his home server. Second, that particular server is called in by the foreign server for providing a ‘credential’ which testifies the user’s claim. We present a new attacking technique which allows a malicious server …
How Much You Watch, How Much You Pay, Yongdong Wu, Hwee Hwa Pang, Robert H. Deng
How Much You Watch, How Much You Pay, Yongdong Wu, Hwee Hwa Pang, Robert H. Deng
Research Collection School Of Computing and Information Systems
This paper presents a pay-video scheme that manages video stream, key stream and payment stream efficiently. In our scheme, the owner segments a video into fragments and encrypts them with independent keys. The keys are generated with a novel concept called as hash interval, where each hash interval discloses a range of numbers without disclosing any information on numbers outside of the range. The video fragments are then broadcast on one or more channels. A buyer can purchase the keys to decrypt any fragments and, within each fragment, any desired quality level. The accompanying payment protocol is integrated with the …
On The Intertemporal Risk-Return Relation: A Bayesian Model Comparison Perspective, Leping Wang
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 …
Micro-Level Estimation Of Child Malnutrition Indicators And Its Application In Cambodia, Tomoki Fujii
Micro-Level Estimation Of Child Malnutrition Indicators And Its Application In Cambodia, Tomoki Fujii
Research Collection School Of Economics
One of the major limitations in addressing child malnutrition is lack of information that could be used to target resources. By combining demographic and health survey (DHS) and population census data, the author disaggregates the estimates of the prevalence of child malnutrition in Cambodia from currently available 17 DHS strata into 1,594 communes. The methodology is built on the small-area estimation technique developed by Elbers, Lanjouw, and Lanjouw. The author extends it to jointly estimate multiple indicators and to allow for a richer structure of error terms. Average standard errors for the commune-level estimates in this study were about 4 …
Staying Ahead Of The Competition: Insights From Singapore's Manufacturing Enclave In Vietnam, Caroline Yeoh, Di Kun Goh, Wilfred Pow Ngee How
Staying Ahead Of The Competition: Insights From Singapore's Manufacturing Enclave In Vietnam, Caroline Yeoh, Di Kun Goh, Wilfred Pow Ngee How
Research Collection Lee Kong Chian School Of Business
The apparent success of Singapore-styled industrial parks in attracting foreign investments into the emerging Asian economies to capitalize on cheap and abundant resources has led, pari passu, to a mushrooming of similarly-patterned competitor parks in close proximity to the flagship projects. Many of the competitor parks offer either similar or comparable facilities, lower rates, or, in some cases, both. The ensuing dynamic competitive interactions between the competitor parks and the Singapore-styled parks have forced a re-examination of the viability of the Singapore advantage in navigating the economics of competition, and in sustaining competitive advantage. The Vietnam-Singapore Industrial Park (VSIP), unsurprisingly, …
The Korean Language And The Effects Of Its Honorifics System In Advertising: Deferential Vs. Informal Speech As Regulatory Prime On Persuasive Impact, Jin K. Han, Yong Seok Sohn, Kun Woo Yoo
The Korean Language And The Effects Of Its Honorifics System In Advertising: Deferential Vs. Informal Speech As Regulatory Prime On Persuasive Impact, Jin K. Han, Yong Seok Sohn, Kun Woo Yoo
Research Collection Lee Kong Chian School Of Business
A very prominent feature of the Korean language is its extensive honorifics system, where the speaker is obliged to adopt a level of speech (deferential vs. informal) befitting the status of the target audience. As the context for using deferential (informal) speech parallels the setting for prevention (promotion) focus, we set out to examine whether the Korean honorifics system itself functions as a natural prime for regulatory orientation. In Study 1, we find that deferential (informal) speech style activates prevention (promotion) focus in the addressee. Accordingly, we show that ad copies in deferential (informal) speech style resulted in regulatory fit …
Co-Clustering Of Time-Evolving News Story With Transcript And Keyframe, Xiao Wu, Chong-Wah Ngo, Qing Li
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.
Protection For Sale Under Monopolistic Competition, Pao Li Chang
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.
Hot Event Detection And Summarization By Graph Modeling And Matching, Yuxin Peng, Chong-Wah Ngo
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 …
Exploiting Belief Bounds: Practical Pomdps For Personal Assistant Agents, Pradeep Varakantham, Rajiv Maheswaran, Milind Tambe
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 …
Aggregate Nearest Neighbor Queries In Spatial Databases, Dimitris Papadias, Yufei Tao, Kyriakos Mouratidis, Chun Kit Hui
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 …
Trade, Capital Accumulation And Structural Unemployment: An Empirical Study Of The Singapore Economy, Hiau Looi Kee, Hian Teck Hoon
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 …