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Dividing Hedging And Gambling: Legal Implications Of Derivative Instruments, Christopher C. H. Chen Jan 2006

Dividing Hedging And Gambling: Legal Implications Of Derivative Instruments, Christopher C. H. Chen

Research Collection Yong Pung How School Of Law

The past three decades have seen the emergence in themarket of many different types of “derivativeinstruments”, ranging from futures, forwards, options,and swaps1 to some other hybrid instruments2 orsynthetic transactions3 . Along with insurance,derivative instruments help market participants notonly to hedge various types of risks but also to engagein market speculation. A derivative transaction couldserve the purpose of avoiding large losses (i.e. hedging)as well as earning a windfall (i.e. speculation). As such,one question arises: Is there any difference betweengambling and derivative trading?

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Advances In Data Modeling Research, G. Allen, A. Bajaj, V. Khatri, S. Ram, Keng Siau Jan 2006

Advances In Data Modeling Research, G. Allen, A. Bajaj, V. Khatri, S. Ram, Keng Siau

Research Collection School Of Computing and Information Systems

In this paper, we summarize the discussions of the panel on "Advances in Data Modeling Research," held at the Americas Conference on Information Systems (AMCIS) in 2005. We focus on four primary areas where data modeling research offers rich opportunities: spatio-temporal semantics, genome research, ontological analysis and empirical evaluation of existing models. We highlight past work in each area and also discuss open questions, with a view to promoting future research in the overall data modeling area.

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Grid-Partition Index: A Hybrid Approach To Nearest-Neighbor Queries In Wireless Location-Based Services, Baihua Zheng, Jianliang Xu, Wang-Chien Lee, Dik Lun Lee Jan 2006

Grid-Partition Index: A Hybrid Approach To Nearest-Neighbor Queries In Wireless Location-Based Services, Baihua Zheng, Jianliang Xu, Wang-Chien Lee, Dik Lun Lee

Research Collection School Of Computing and Information Systems

Traditional nearest-neighbor (NN) search is based on two basic indexing approaches: object-based indexing and solution-based indexing. The former is constructed based on the locations of data objects: using some distance heuristics on object locations. The latter is built on a precomputed solution space. Thus, NN queries can be reduced to and processed as simple point queries in this solution space. Both approaches exhibit some disadvantages, especially when employed for wireless data broadcast in mobile computing environments. In this paper, we introduce a new index method, called the grid-partition index, to support NN search in both ondemand access and periodic broadcast …

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Towards Better Quality Specification Miners, David Lo, Siau-Cheng Khoo Jan 2006

Towards Better Quality Specification Miners, David Lo, Siau-Cheng Khoo

Research Collection School Of Computing and Information Systems

Softwares are often built without specification. Tools to automatically extract specification from software are needed and many techniques have been proposed. One type of these specifications – temporal API specification – is often specified in the form of automaton (i.e., FSA/PFSA). There have been many work on mining software temporal specification using dynamic analysis techniques; i.e., analysis of software program traces. Unfortunately, the issues of scalability, robustness and accuracy of these techniques have not been comprehensively addressed. In this paper, we describe a framework that enables assessments of the performance of a specification miner in generating temporal specification of software …

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Regulating Directors' Duties With Civil Penalties: Taking A Leaf From Australia's Book, Pey Woan Lee Jan 2006

Regulating Directors' Duties With Civil Penalties: Taking A Leaf From Australia's Book, Pey Woan Lee

Research Collection Yong Pung How School Of Law

This article examines whether the use of the criminal penalty as a 'default' sanction for regulating directors' core duties in Singapore is excessive, and if so, whether civil pecuniary penalties ought to be introduced in the reform of the existing sanctions regime. These questions are addressed principally by reference to the Australian experience.

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Improving The Quality Of Conceptual Modeling Using Cognitive Mapping Techniques, Keng Siau, X. Tan Dec 2005

Improving The Quality Of Conceptual Modeling Using Cognitive Mapping Techniques, Keng Siau, X. Tan

Research Collection School Of Computing and Information Systems

Conceptual modeling involves the understanding and communication between system analysts and end-users. Many factors may affect the quality of conceptual modeling processes as well as the models per se. Human cognition plays a pivotal role in understanding these factors and cognitive mapping techniques are effective tools to elicit and represent human cognition. In this paper, we look at the use of cognitive mapping techniques to improve the quality of conceptual modeling. We review frameworks on quality in conceptual modeling and examine the role of human cognition in conceptual modeling. The paper also discusses how human cognition is related to quality …

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New Efficient Mds Array Codes For Raid Part Ii: Rabin-Like Codes For Tolerating Multiple (>=4) Disk Failures, Gui-Liang Feng, Robert H. Deng, Feng Bao Dec 2005

New Efficient Mds Array Codes For Raid Part Ii: Rabin-Like Codes For Tolerating Multiple (>=4) Disk Failures, Gui-Liang Feng, Robert H. Deng, Feng Bao

Research Collection School Of Computing and Information Systems

A new class of Binary Maximum Distance Separable (MDS) array codes which are based on circular permutation matrices are introduced in this paper. These array codes are used for tolerating multiple (greater than or equal to 4) disk failures in Redundant Arrays of Inexpensive Disks (RAID) architecture. The size of the information part is m \times n, where n is the number of information disks and (m+1) is a prime integer; the size of the parity-check part is m \times r, the minimum distance is r+1, and the number of parity-check disks is r. In practical applications, m can be …

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Matrix: Adaptive Middleware For Distributed Multiplayer Games, Rajesh Krishna Balan, Maria Ebling, Paul Castro, Archan Misra Dec 2005

Matrix: Adaptive Middleware For Distributed Multiplayer Games, Rajesh Krishna Balan, Maria Ebling, Paul Castro, Archan Misra

Research Collection School Of Computing and Information Systems

Building a distributed middleware infrastructure that provides the low latency required for massively multiplayer games while still maintaining consistency is non-trivial. Previous attempts have used static partitioning or client-based peer-to-peer techniques that do not scale well to a large number of players, perform poorly under dynamic workloads or hotspots, and impose significant programming burdens on game developers. We show that it is possible to build a scalable distributed system, called Matrix, that is easily usable by game developers. We show experimentally that Matrix provides good performance, especially when hotspots occur.

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Sequential Aggregate Signatures Working Over Independent Homomorphic Trapdoor One-Way Permutation Domains, Huafei Zhu, Feng Bao, Robert H. Deng Dec 2005

Sequential Aggregate Signatures Working Over Independent Homomorphic Trapdoor One-Way Permutation Domains, Huafei Zhu, Feng Bao, Robert H. Deng

Research Collection School Of Computing and Information Systems

The contribution of this paper has two folds. In the first fold, we propose a generic construction of sequential aggregate signatures from families of certificated trapdoor one-way permutations. We show that our construction is provably secure in the random oracle model assuming that the underlying homomorphic permutations are trapdoor one-way. Compared to Lysyanskaya et al’s generic construction that is constructed from a trapdoor one-way permutation family working over the same domain [16], our scheme works over independent trapdoor one-way permutation domains. The flexible choice of the underlying permutation domains benefits our scheme to its applications in the real world where …

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Determinants Of Intra-Day Stock Price Change And Asymmetric Information, Christopher Hian Ann Ting Dec 2005

Determinants Of Intra-Day Stock Price Change And Asymmetric Information, Christopher Hian Ann Ting

Research Collection Lee Kong Chian School Of Business

This paper presents a synthesized model of asymmetric information. An empirical analysis of more than 1,400 NYSE common stocks shows that trade direction is more important than volume in revealing the asymmetry. There is also evidence to suggest that signed duration reflects informed trading activity. We use the proposed measure of information asymmetry to study daily changes in the level of informed trading and find that earnings announcements narrow the information gap between the informed and the uninformed. On average, information asymmetry is largest at the beginning of the trading day and it decreases monotonically toward the closing bell. More …

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Retest Effects In Operational Selection Settings: Development And Test Of A Framework, Filip Lievens, Tine Buyse, Paul R. Sackett Dec 2005

Retest Effects In Operational Selection Settings: Development And Test Of A Framework, Filip Lievens, Tine Buyse, Paul R. Sackett

Research Collection Lee Kong Chian School Of Business

This study proposes a framework for examining the effects of retaking tests in operational selection settings. A central feature of this framework is the distinction between within-person and between-person retest effects. This framework is used to develop hypotheses about retest effects for exemplars of 3 types of tests (knowledge tests, cognitive ability tests, and situational judgment tests) and to test these hypotheses in a high stakes selection setting (admission to medical studies in Belgium). Analyses of within-person retest effects showed that mean scores of repeat test takers were one-third of a standard deviation higher for the knowledge test and situational …

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A Grapheme To Phoneme Converter For Standard Malay, Haizhou Li, Mahani Aljunied, Boon Seong Teoh Dec 2005

A Grapheme To Phoneme Converter For Standard Malay, Haizhou Li, Mahani Aljunied, Boon Seong Teoh

Research Collection Lee Kong Chian School Of Business

This paper describes the process of creating a grapheme-to-phoneme (G2P) converter for Standard Malay (SM). A fundamental step to building TTS and ASR engines, is to build a good G2P system that can automatically generate accurate phonemic representations for words. Our goal is to generate phonemes that reflect real speech, thereby facilitating more accurate phoneme alignment with actual waveforms (obtained from voice-data collection), keeping human intervention to the minimum. Here we discuss the key areas in SM that require considerable phonemic alterations including letter elisions, consonant insertions, multiple ways of uttering a letter/diagraph – areas that any good G2P system …

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Fostering Total Wellness Through Peer Helping: Reflections On The Smu Experiences, Gilbert Tan, Timothy Hsi Dec 2005

Fostering Total Wellness Through Peer Helping: Reflections On The Smu Experiences, Gilbert Tan, Timothy Hsi

Research Collection Lee Kong Chian School Of Business

Peer Helping is widely implemented in Colleges and Universities in the United States and Canada. Despite the popularity of these programs, very little has been researched on peer helping in the Asian context. This paper traces the theoretical foundations of peer helping and the nascent development of a peer helping program in the Singapore Management University and how this program has developed since the beginning of 2004. The initial focus of the program was based on the model of paraprofessional student counselors assisting their fellow peers through difficult moments in their lives. Over time, the program was fine-tuned to embrace …

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An Efficient And Robust Computational Framework For Studying Lifetime And Information Capacity In Sensor Networks, Enrique J. Duarte-Melo, Mingyan Liu, Archan Misra Dec 2005

An Efficient And Robust Computational Framework For Studying Lifetime And Information Capacity In Sensor Networks, Enrique J. Duarte-Melo, Mingyan Liu, Archan Misra

Research Collection School Of Computing and Information Systems

In this paper we investigate the expected lifetime and information capacity, defined as the maximum amount of data (bits) transferred before the first sensor node death due to energy depletion, of a data-gathering wireless sensor network. We develop a fluid-flow based computational framework that extends the existing approach, which requires precise knowledge of the layout/deployment of the network, i.e., exact sensor positions. Our method, on the other hand, views a specific network deployment as a particular instance (sample path) from an underlying distribution of sensor node layouts and sensor data rates. To compute the expected information capacity under this distribution-based …

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E-Government Capabilities And Crisis Management: Lessons From Combating Sars In Singapore, Shan Ling Pan, Gary Pan, Paul R. Devadoss Dec 2005

E-Government Capabilities And Crisis Management: Lessons From Combating Sars In Singapore, Shan Ling Pan, Gary Pan, Paul R. Devadoss

Research Collection School Of Accountancy

The city-state of Singapore has been highly ranked for its e-government services. Over the past two decades, it has leveraged its IT infrastructure for economic development and transformed its public services. The SARS outbreak in 2004 turned into a national health crisis because it spread rapidly and the medical community had little knowledge of how to treat the new mutation of the corona virus. Yet, several Singaporean government agencies utilized the e-Government infrastructure and related resources to quickly bring the outbreak under control. In particular, the government?s IT infrastructure streamlined communications, information exchange, and data flow, and significantly eased collaboration …

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Cultural Crossings Against Ethnocentric Currents: Toward A Confucian Ethics Of Communicative Virtues, Sor-Hoon Tan Dec 2005

Cultural Crossings Against Ethnocentric Currents: Toward A Confucian Ethics Of Communicative Virtues, Sor-Hoon Tan

Research Collection School of Social Sciences

Despite contemporary Confucianism's aspirations to be a world philosophy, there is an ethnocentric strand within the Confucian tradition, most glaringly exemplified in Han Yu's attacks on Buddhism. This paper re-assesses Confucian ethnocentrism in the context of contrary practices that indicate a more pragmatic attitude among Confucians toward cross-cultural interactions. It argues that while the ethnocentric tendency serves as constant reminder of the need for vigilance, and recognition of the difficulties of crossing cultural boundaries, there are nevertheless resources within Confucianism for constructing an ethics of communication that is urgently needed to deal with the moral problems of cultural pluralism. The …

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Integration Of Probabilistic Graphic Models For Decision Support, Jiang C., Poh K., Tze-Yun Leong Dec 2005

Integration Of Probabilistic Graphic Models For Decision Support, Jiang C., Poh K., Tze-Yun Leong

Research Collection School Of Computing and Information Systems

It is a frequently encountered problem that new knowledge arrived when making decisions in a dynamic world. Usually, domain experts cannot afford enough time and knowledge to effectively assess and combine both qualitative and quantitative information in these models. Existing approaches can solve only one of two tasks instead of both. We propose a four-step algorithm to integrate multiple probabilistic graphic models, which can effectively update existing models with newly acquired models. In this algorithm, the qualitative part of model integration is performed first, followed by the quantitative combination. We illustrate our method with an example of combining three models. …

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A Block Oriented Fingerprinting Scheme In Relational Database, Siyuan Liu, Shuhong Wang, Robert H. Deng, Weizhong Shao Dec 2005

A Block Oriented Fingerprinting Scheme In Relational Database, Siyuan Liu, Shuhong Wang, Robert H. Deng, Weizhong Shao

Research Collection School Of Computing and Information Systems

The need for protecting rights over relational data is of ever increasing concern. There have recently been some pioneering works in this area. In this paper, we propose an effective fingerprinting scheme based on the idea of block method in the area of multimedia fingerprinting. The scheme ensures that certain bit positions of the data contain specific values. The bit positions are determined by the keys known only to the owner of the data and different buyers of the database have different bit positions and different specific values for those bit positions. The detection of the fingerprint can be completed …

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Cryptanalysis Of A Forward Secure Blind Signature Scheme With Provable Security, Shuhong Wang, Feng Bao, Robert H. Deng Dec 2005

Cryptanalysis Of A Forward Secure Blind Signature Scheme With Provable Security, Shuhong Wang, Feng Bao, Robert H. Deng

Research Collection School Of Computing and Information Systems

A forward secure blind signature scheme was proposed by Duc, Cheon and Kim, in ICICS 2003. The security of the scheme was proved to be equivalent to the strong RSA assumption in the random oracle model. In this paper we present an attack to the scheme by forging valid signatures with public keys only. The attack is so efficient that forging a valid signature needs less computation than legally generating a signature, even considering only the user side. Our result implies that the security proof of the scheme must be invalid. Furthermore we point out the fault of the proof …

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A Framework To Learn Bayesian Network From Changing, Multiple-Source Biomedical Data, Li G., Tze-Yun Leong Dec 2005

A Framework To Learn Bayesian Network From Changing, Multiple-Source Biomedical Data, Li G., Tze-Yun Leong

Research Collection School Of Computing and Information Systems

Structure learning in Bayesian network is a big issue. Many efforts have tried to solve this problem and quite a few algorithms have been proposed. However, when we attempt to apply the existing methods to microarray data, there are three main challenges: 1) there are many variables in the data set, 2) the sample size is small, and 3) microarray data are changing from experiment to experiment and new data are available quickly. To address these three problems, we assume that the major functions of a kind of cells do not change too much in different experiments, and propose a …

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Selective Object Stabilization For Home Video Consumers, Zailiang Pan, Chong-Wah Ngo Nov 2005

Selective Object Stabilization For Home Video Consumers, Zailiang Pan, Chong-Wah Ngo

Research Collection School Of Computing and Information Systems

This paper describes a unified approach for video stabilization. The essential goal is to stabilize image sequences that consist of moving foreground objects, which appear frequently in today's home videos captured by hand-held consumer cameras. Our proposed techniques mainly, rely on the analysis of;motion content. Three major components area initialization, segmentation and stabilization. In motion initialization, we propose a novel algorithm to efficiently search for the best possible frame in a sequence to start segmentation. Our segmentation algorithm is based on Expectation-Maximization (EM) framework which provides the mechanism for simultaneous estimation of motion models and their layers of support. Based …

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Exploiting Self-Adaptive Posture-Based Focus Estimation For Lecture Video Editing, Feng Wang, Chong-Wah Ngo, Ting-Chuen Pong Nov 2005

Exploiting Self-Adaptive Posture-Based Focus Estimation For Lecture Video Editing, Feng Wang, Chong-Wah Ngo, Ting-Chuen Pong

Research Collection School Of Computing and Information Systems

Head pose plays a special role in estimating a presenter’s focuses and actions for lecture video editing. This paper presents an efficient and robust head pose estimation algorithm to cope with the new challenges arising in the content management of lecture videos. These challenges include speed requirement, low video quality, variant presenting styles and complex settings in modern classrooms. Our algorithm is based on a robust hierarchical representation of skin color clustering and a set of pose templates that are automatically trained. Contextual information is also considered to refine pose estimation. Most importantly, we propose an online learning approach to …

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Accounting Conservatism And Managerial Incentives, Young Koan Kwon Nov 2005

Accounting Conservatism And Managerial Incentives, Young Koan Kwon

Research Collection School Of Accountancy

There are two sources of agency costs under moral hazard: (1) distortions in incentive contracts and (2) implementation of suboptimal decisions. In the accounting literature, the relation between conservative accounting and agency costs of type (1) has received considerable attention (cf. Watts 2002). However, little appears to be known about the effects of accounting conservatism on agency costs of type (2) or trade-offs between agency costs of types (1) and (2). The purpose of this study is to examine this void. In a principal-agent setting in which the principal motivates the agent to expend effort using accounting earnings, this study …

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Mri-Assessed Volume Of Left And Right Hippocampi In Females Correlates With The Relative Length Of The Second And Fourth Fingers (The 2d : 4d Ratio), Janos Kallai, Arpad Csatho, Ferenc Kover, Tamas Makany, Janos Nemes, Krisztina Horvath, Norbert Kovacs, John T. Manning, Lynn Nadel, Ferenc Nagy Nov 2005

Mri-Assessed Volume Of Left And Right Hippocampi In Females Correlates With The Relative Length Of The Second And Fourth Fingers (The 2d : 4d Ratio), Janos Kallai, Arpad Csatho, Ferenc Kover, Tamas Makany, Janos Nemes, Krisztina Horvath, Norbert Kovacs, John T. Manning, Lynn Nadel, Ferenc Nagy

Research Collection Lee Kong Chian School Of Business

Atrophy of the left or right side of the hippocampus has been related to cognitive deficits and psychiatric disease. In this study, we examined the correlation between the hippocampal volume laterality index and the relative lengths of the second (index finger) and fourth (ring finger) digits (2D:4D) in healthy female subjects. The 2D:4D ratio is fixed in utero, and the ratio is higher in women than in men. There is evidence that this ratio is an indicator of the intrauterine concentration of testosterone, which influences the development of different regions of the brain. Assessing the volume of different parts of …

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A Spatial Analysis Of The Xiii Italian Legislature, Massimiliano Landi, Riccardo Pelizzo Nov 2005

A Spatial Analysis Of The Xiii Italian Legislature, Massimiliano Landi, Riccardo Pelizzo

Research Collection School of Social Sciences

We present a spatial map of the Italian House of Deputies during the XIII Legislature obtained by applying the Poole and Rosenthal methodology to roll call data. We estimate coordinates for almost all the 650 Deputies that were on the House’s floor at the time, and we aggregate them according to parties. We find that voting patters generate basically a two dimensional political space. The first dimension represents loyalty to either the ruling coalition or the opposing one. The second dimension is represented by the European Union. These findings are consistent with the exceptional case of the party Northern League, …

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Motion-Based Approach For Bbc Rushes Structuring And Characterization, Chong-Wah Ngo, Zailiang Pan Nov 2005

Motion-Based Approach For Bbc Rushes Structuring And Characterization, Chong-Wah Ngo, Zailiang Pan

Research Collection School Of Computing and Information Systems

No abstract provided.

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A Threshold-Based Algorithm For Continuous Monitoring Of K Nearest Neighbors, Kyriakos Mouratidis, Dimitris Papadias, Spiridon Bakiras, Yufei Tao Nov 2005

A Threshold-Based Algorithm For Continuous Monitoring Of K Nearest Neighbors, Kyriakos Mouratidis, Dimitris Papadias, Spiridon Bakiras, Yufei Tao

Research Collection School Of Computing and Information Systems

Assume a set of moving objects and a central server that monitors their positions over time, while processing continuous nearest neighbor queries from geographically distributed clients. In order to always report up-to-date results, the server could constantly obtain the most recent position of all objects. However, this naïve solution requires the transmission of a large number of rapid data streams corresponding to location updates. Intuitively, current information is necessary only for objects that may influence some query result (i.e., they may be included in the nearest neighbor set of some client). Motivated by this observation, we present a threshold-based algorithm …

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Common Pattern Discovery Using Earth Mover's Distance And Local Flow Maximization, Hung-Khoon Tan, Chong-Wah Ngo Oct 2005

Common Pattern Discovery Using Earth Mover's Distance And Local Flow Maximization, Hung-Khoon Tan, Chong-Wah Ngo

Research Collection School Of Computing and Information Systems

In this paper, we present a novel segmentation-insensitive approach for mining common patterns from 2 images. We develop an algorithm using the earth movers distance (EMD) framework, unary and adaptive neighborhood color similarity. We then propose a novel local flow maximization approach to provide the best estimation of location and scale of the common pattern. This is achieved by performing an iterative optimization in search of the most stable flows' centroid. Common pattern discovery is difficult owing to the huge search space and problem domain. We intend to solve this problem by reducing the search space through identifying the location …

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How To Understand China: The Dangers And Opportunities Of Being A Rising Power, William A. Callahan Oct 2005

How To Understand China: The Dangers And Opportunities Of Being A Rising Power, William A. Callahan

Research Collection School of Social Sciences

china’s situation lends itself to hyperbole. the people’s republic of china (prc) has the largest population in the world, the fastest growing economy in the world, the largest army in the world, the largest middle class in the world, a permanent seat on the united nations security council, a manned space programme, a nuclear arsenal, and so on. but analysts, commentators and policymakers have yet to decide just how to understand china.

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Growth Is Good For Whom, When, How?, John A. Donaldson Oct 2005

Growth Is Good For Whom, When, How?, John A. Donaldson

Research Collection School of Social Sciences

Economic growth often helps the poor, but what about the many cases when it does not? The consensus that economic growth reduces poverty, encapsulated by two World Bank economists in the above-quoted article entitled Growth is Good for the Poor, leaves many important questions unanswered. What help does the knowledge that economic growth can reduce poverty provide for economies with few realistic prospects for robust, sustained growth? What hope does the understanding that growth reduces poverty on average provide for poor families that are excluded from prosperity? How should we respond when economic growth undermines the market positions of the …

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