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Cuhk At Imageclef 2005: Cross-Language And Cross Media Image Retrieval, Steven Hoi, Jianke Zhu, Michael R. Lyu Sep 2006

Cuhk At Imageclef 2005: Cross-Language And Cross Media Image Retrieval, Steven Hoi, Jianke Zhu, Michael R. Lyu

Research Collection School Of Computing and Information Systems

In this paper, we describe our studies of cross-language and cross-media image retrieval at the ImageCLEF 2005. This is the first participation of our CUHK (The Chinese University of Hong Kong) group at ImageCLEF. The task in which we participated is the “bilingual ad hoc retrieval” task. There are three major focuses and contributions in our participation. The first is the empirical evaluation of language models and smoothing strategies for cross-language image retrieval. The second is the evaluation of cross-media image retrieval, i.e., combining text and visual contents for image retrieval. The last is the evaluation of bilingual image retrieval …

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Higher Order Bias Correcting Moment Equation For M-Estimation And Its Higher Order Efficiency, Kyoo-Il Kim Sep 2006

Higher Order Bias Correcting Moment Equation For M-Estimation And Its Higher Order Efficiency, Kyoo-Il Kim

Research Collection School Of Economics

This paper studies an alternative bias correction for the M-estimator, which is obtained by correcting the moment equation in the spirit of Firth (1993). In particular, this paper compares the stochastic expansions of the analytically bias-corrected estimator and the alternative estimator and finds that the third-order stochastic expansions of these two estimators are identical. This implies that at least in terms of the third order stochastic expansion, we cannot improve on the simple one-step bias correction by using the bias correction of moment equations. Though the result in this paper is for a fixed number of parameters, our intuition may …

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Semiparametric Estimation Of Signaling Games, Kyoo-Il Kim Sep 2006

Semiparametric Estimation Of Signaling Games, Kyoo-Il Kim

Research Collection School Of Economics

This paper studies an econometric modeling of a signaling game with two players where one player has one of two types. In particular, we develop an estimation strategy that identifies the payoffs structure and the distribution of types from data of observed actions. We can achieve uniqueness of equilibrium using a refinement, which enables us to identify the parameters of interest. In the game, we consider non-strategic public signals about the types. Because the mixing distribution of these signals is nonparametrically specified, we propose to estimate the model using a sieve conditional MLE. We achieve the consistency and the asymptotic …

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Uniform Convergence Rate Of The Snp Density Estimator And Testing For Similarity Of Two Unknown Densities, Kyoo-Il Kim Sep 2006

Uniform Convergence Rate Of The Snp Density Estimator And Testing For Similarity Of Two Unknown Densities, Kyoo-Il Kim

Research Collection School Of Economics

This paper studies the uniform convergence rate of the turncated SNP (semi-nonparametric) density estimator. Using the uniform convergence rate result we obtain, we propose a test statistic testing the equivalence of two unknown densities where two densities are estimated using the SNP estimator and supports of densities are possibly unbounded.

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Multivariate Stochastic Volatility Models: Bayesian Estimation And Model Comparison, Jun Yu, Renate Meyer Sep 2006

Multivariate Stochastic Volatility Models: Bayesian Estimation And Model Comparison, Jun Yu, Renate Meyer

Research Collection School Of Economics

In this paper we show that fully likelihood-based estimation and comparison of multivariate stochastic volatility (SV) models can be easily performed via a freely available Bayesian software called WinBUGS. Moreover, we introduce to the literature several new specifications that are natural extensions to certain existing models, one of which allows for time-varying correlation coefficients. Ideas are illustrated by fitting, to a bivariate time series data of weekly exchange rates, nine multivariate SV models, including the specifications with Granger causality in volatility, time-varying correlations, heavy-tailed error distributions, additive factor structure, and multiplicative factor structure. Empirical results suggest that the best specifications …

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Wireless Indoor Positioning System With Enhanced Nearest Neighbors In Signal Space Algorithm, Quang Tran, Juki Wirawan Tantra, Ah-Hwee Tan, Ah-Hwee Tan, Kin-Choong Yow, Dongyu Qiu Sep 2006

Wireless Indoor Positioning System With Enhanced Nearest Neighbors In Signal Space Algorithm, Quang Tran, Juki Wirawan Tantra, Ah-Hwee Tan, Ah-Hwee Tan, Kin-Choong Yow, Dongyu Qiu

Research Collection School Of Computing and Information Systems

With the rapid development and wide deployment of wireless Local Area Networks (WLANs), WLAN-based positioning system employing signal-strength-based technique has become an attractive solution for location estimation in indoor environment. In recent years, a number of such systems has been presented, and most of the systems use the common Nearest Neighbor in Signal Space (NNSS) algorithm. In this paper, we propose an enhancement to the NNSS algorithm. We analyze the enhancement to show its effectiveness. The performance of the enhanced NNSS algorithm is evaluated with different values of the parameters. Based on the performance evaluation and analysis, we recommend some …

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Continuous Nearest Neighbor Monitoring In Road Networks, Kyriakos Mouratidis, Man Lung Yiu, Dimitris Papadias, Nikos Mamoulis Sep 2006

Continuous Nearest Neighbor Monitoring In Road Networks, Kyriakos Mouratidis, Man Lung Yiu, Dimitris Papadias, Nikos Mamoulis

Research Collection School Of Computing and Information Systems

Recent research has focused on continuous monitoring of nearest neighbors (NN) in highly dynamic scenarios, where the queries and the data objects move frequently and arbitrarily. All existing methods, however, assume the Euclidean distance metric. In this paper we study k-NN monitoring in road networks, where the distance between a query and a data object is determined by the length of the shortest path connecting them. We propose two methods that can handle arbitrary object and query moving patterns, as well as °uctuations of edge weights. The ¯rst one maintains the query results by processing only updates that may invalidate …

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Three Architectures For Trusted Data Dissemination In Edge Computing, Shen-Tat Goh, Hwee Hwa Pang, Robert H. Deng, Feng Bao Sep 2006

Three Architectures For Trusted Data Dissemination In Edge Computing, Shen-Tat Goh, Hwee Hwa Pang, Robert H. Deng, Feng Bao

Research Collection School Of Computing and Information Systems

Edge computing pushes application logic and the underlying data to the edge of the network, with the aim of improving availability and scalability. As the edge servers are not necessarily secure, there must be provisions for users to validate the results—that values in the result tuples are not tampered with, that no qualifying data are left out, that no spurious tuples are introduced, and that a query result is not actually the output from a different query. This paper aims to address the challenges of ensuring data integrity in edge computing. We study three schemes that enable users to check …

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The Importance Of Issues Management In International Mergers And Acquisitions, Mark Chong Aug 2006

The Importance Of Issues Management In International Mergers And Acquisitions, Mark Chong

Research Collection Lee Kong Chian School Of Business

Issues management is the strategic use of issues analysis and strategic responses to help organizations make adaptations needed to achieve harmony and foster mutual interests within the communities in which they operate (Heath, 1997, p. 3). It seeks to build, maintain and repair relationships with an organizationÆs stakeholders by keeping surveillance for threats and opportunities in the environment that can affect success in achieving organizational mission and goals (Heath, 2002). Accordingly, organizations modify corporate policy, shape legislation or influence public opinion to synchronize themselves with the prevailing or emerging climate of public opinion and sensitivity

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Collaborative Image Retrieval Via Regularized Metric Learning, Luo Si, Rong Jin, Steven C. H. Hoi, Michael R. Lyu Aug 2006

Collaborative Image Retrieval Via Regularized Metric Learning, Luo Si, Rong Jin, Steven C. H. Hoi, Michael R. Lyu

Research Collection School Of Computing and Information Systems

In content-based image retrieval (CBIR), relevant images are identified based on their similarities to query images. Most CBIR algorithms are hindered by the semantic gap between the low-level image features used for computing image similarity and the high-level semantic concepts conveyed in images. One way to reduce the semantic gap is to utilize the log data of users' feedback that has been collected by CBIR systems in history, which is also called “collaborative image retrieval.” In this paper, we present a novel metric learning approach, named “regularized metric learning,” for collaborative image retrieval, which learns a distance metric by exploring …

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Evidence On The Relationship Between Takaful Insurance And Fundamental Perception Of Islamic Principles, Ramin Cooper Maysami, John Joseph Williams Aug 2006

Evidence On The Relationship Between Takaful Insurance And Fundamental Perception Of Islamic Principles, Ramin Cooper Maysami, John Joseph Williams

Research Collection School Of Accountancy

One of the complexities overarching the concept of Islamic insurance is anchored in the belief system pertaining to fundamental Islamic Law, while another is embedded in the role of profit within the takaful contract. The purpose of this study is to empirically explore the association between the awareness of the existence of Islamic insurance (takaful) and religious perceptions of this financial service.

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The Association Between Audit Quality And Abnormal Audit Fees, Jong-Hag Choi, Jeong-Bon Kim, Yoonseok Zang Aug 2006

The Association Between Audit Quality And Abnormal Audit Fees, Jong-Hag Choi, Jeong-Bon Kim, Yoonseok Zang

Research Collection School Of Accountancy

Using a sample of 9,820 firm-year observations over the 2000-2003 period, this paper examines whether, and how, audit quality proxied by unsigned discretionary accruals is associated with abnormal audit fees, i.e., actual audit fees in excess of expected, normal audit fees. The results of various regressions reveal that the association between the two is insignificant for the full sample, significantly positive for the subsample of clients with positive abnormal fees, and insignificantly negative for the subsample of clients with negative abnormal fees. The above results suggest that auditors’ incentives to compromise audit quality differ systematically for more profitable clients (with …

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Protection For Sale Under Monopolistic Competition: An Empirical Investigation, Pao Li Chang, Myoung-Jae Lee Aug 2006

Protection For Sale Under Monopolistic Competition: An Empirical Investigation, Pao Li Chang, Myoung-Jae Lee

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 monopolistically 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 monopolistically competitive sectors. The two protection regimes are simultaneously estimated with joint constraints. The results of the J-test consistently reject the homogeneous (perfect competition) protection-for-sale model often adopted in previous literature and suggest a direction of improvement toward the proposed heterogeneous protection structure model.

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Characterizing Exchange Rate Policy In East Asia: A Reconsideration, Hwee Kwan Chow Aug 2006

Characterizing Exchange Rate Policy In East Asia: A Reconsideration, Hwee Kwan Chow

Research Collection School Of Economics

Frankel and Wei [Frankel, J. A., & Wei, S.-J. (1994). Yen bloc or dollar bloc: Exchange rate policies of the East Asian economies. In I. Takatoshi & A. Krueger (Eds.), Macroeconomic linkages. Chicago: University of Chicago Press] developed and popularized a method for uncovering the implicit weights assigned to major international currencies constituting a currency basket. We extend the methodology in two dimensions: include regional competitive pressure and employ a vector autoregressive (VAR) model to overcome simultaneity bias. With these modifications, we confirm the prominent role of the US dollar in the exchange rate policy of East Asian economies beyond …

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The Coevolution Of Economic And Political Development, Fali Huang Aug 2006

The Coevolution Of Economic And Political Development, Fali Huang

Research Collection School Of Economics

This paper establishes a simple model of long run economic and political development, which is driven by the inherent technical features of different production factors, and political conflicts among factor owners on how to divide the outputs. The main capital form in economy evolves from land to physical capital and then to human capital, which enables their respective owners (landlords, capitalists, and workers) to gain political powers in the same sequence, shaping the political development path from monarchy to elite ruling and finally to full suffrage. When it is too costly for any group of factor owners to repress others, …

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Understanding Intrinsic Factors Influencing Benefit Maximization Of Is Usage, Brenda Eschenbrenner, Fiona Fui-Hoon Nah Aug 2006

Understanding Intrinsic Factors Influencing Benefit Maximization Of Is Usage, Brenda Eschenbrenner, Fiona Fui-Hoon Nah

Research Collection School Of Computing and Information Systems

This research uses the Repertory Grid technique to understand intrinsic factors influencing benefit maximization of IS usage. The results show that domain-relevant skills, task motivation, cognitive/work style attributes, individual characteristics (identified as creativity traits) and personal characteristics (identified as innovativeness traits) influence benefit maximization of IS usage. The findings not only provide insights on ways to increase quality of IS usage in organizations but are also helpful for identifying approaches that foster attributes leading to increased benefit realization from IS usage.

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Bias And Controversy: Beyond The Statistical Deviation, Hady W. Lauw, Ee Peng Lim, Ke Wang Aug 2006

Bias And Controversy: Beyond The Statistical Deviation, Hady W. Lauw, Ee Peng Lim, Ke Wang

Research Collection School Of Computing and Information Systems

In this paper, we investigate how deviation in evaluation activities may reveal bias on the part of reviewers and controversy on the part of evaluated objects. We focus on a 'data-centric approach' where the evaluation data is assumed to represent the ground truth'. The standard statistical approaches take evaluation and deviation at face value. We argue that attention should be paid to the subjectivity of evaluation, judging the evaluation score not just on 'what is being said' (deviation), but also on 'who says it' (reviewer) as well as on 'whom it is said about' (object). Furthermore, we observe that bias …

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Learning The Unified Kernel Machines For Classification, Steven C. H. Hoi, Michael R. Lyu, Edward Y. Chang Aug 2006

Learning The Unified Kernel Machines For Classification, Steven C. H. Hoi, Michael R. Lyu, Edward Y. Chang

Research Collection School Of Computing and Information Systems

Kernel machines have been shown as the state-of-the-art learning techniques for classification. In this paper, we propose a novel general framework of learning the Unified Kernel Machines (UKM) from both labeled and unlabeled data. Our proposed framework integrates supervised learning, semi-supervised kernel learning, and active learning in a unified solution. In the suggested framework, we particularly focus our attention on designing a new semi-supervised kernel learning method, i.e., Spectral Kernel Learning (SKL), which is built on the principles of kernel target alignment and unsupervised kernel design. Our algorithm is related to an equivalent quadratic programming problem that can be efficiently …

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Empowerment Through Choice?: A Critical Analysis Of The Effects Of Choice In Organizations, Roy Y. J. Chua, Sheena S. Iyengar Jul 2006

Empowerment Through Choice?: A Critical Analysis Of The Effects Of Choice In Organizations, Roy Y. J. Chua, Sheena S. Iyengar

Research Collection Lee Kong Chian School Of Business

The provision of choice is one of the most common vehicles through which managers empower employees in organizations. Although past psychological and organizational research persuasively suggests that choice confers personal agency, and is thus intrinsically motivating, emerging research indicates that there could be potential pitfalls. In this chapter, we examine the various factors that could influence the effects of choice. Specifically, we examine individual-level factors such as the chooser’s socioeconomic status and cultural background. We also examine situational factors such as the content of choice and the number of choices offered. We then expand our discussion on the effect of …

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Partnering Strategies And Performance Of Smes' International Joint Ventures, Jane Wenzhen Lu, Paul W. Beamish Jul 2006

Partnering Strategies And Performance Of Smes' International Joint Ventures, Jane Wenzhen Lu, Paul W. Beamish

Research Collection Lee Kong Chian School Of Business

The international joint venture (IJV) is an important mode in the internationalization of small- and medium-sized enterprises (SMEs). Internationalization in turn is an entrepreneurial behavior in the pursuit of growth. Partnering strategies in the formation of IJVs can have significant effects on the outcome of SMEs' international expansion. In this study, we examine the performance implications of two types of resources contributed by SMEs' IJV partners, host country knowledge and size-based resources. We develop and test three sets of hypotheses about the longevity and financial performance of a sample of 1117 international joint ventures established in 43 countries by 614 …

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Keyframe Retrieval By Keypoints: Can Point-To-Point Matching Help?, Wanlei Zhao, Yu-Gang Jiang, Chong-Wah Ngo Jul 2006

Keyframe Retrieval By Keypoints: Can Point-To-Point Matching Help?, Wanlei Zhao, Yu-Gang Jiang, Chong-Wah Ngo

Research Collection School Of Computing and Information Systems

Bag-of-words representation with visual keypoints has recently emerged as an attractive approach for video search. In this paper, we study the degree of improvement when point-to-point (P2P) constraint is imposed on the bag-of-words. We conduct investigation on two tasks: near-duplicate keyframe (NDK) retrieval, and high-level concept classification, covering parts of TRECVID 2003 and 2005 datasets. In P2P matching, we propose a one-to-one symmetric keypoint matching strategy to diminish the noise effect during keyframe comparison. In addition, a new multi-dimensional index structure is proposed to speed up the matching process with keypoint filtering. Through experiments, we demonstrate that P2P constraint can …

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Hierarchical Hidden Markov Model For Rushes Structuring And Indexing, Chong-Wah Ngo, Zailiang Pan, Xiaoyong Wei Jul 2006

Hierarchical Hidden Markov Model For Rushes Structuring And Indexing, Chong-Wah Ngo, Zailiang Pan, Xiaoyong Wei

Research Collection School Of Computing and Information Systems

Rushes footage are considered as cheap gold mine with the potential for reuse in broadcasting and filmmaking industries. However, it is difficult to mine the "gold" from the rushes since usually only minimum metadata is available. This paper focuses on the structuring and indexing of the rushes to facilitate mining and retrieval of "gold". We present a new approach for rushes structuring and indexing based on motion feature. We model the problem by a two-level Hierarchical Hidden Markov Model (HHMM). The HHMM, on one hand, represents the semantic concepts in its higher level to provide simultaneous structuring and indexing, on …

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Prediction-Based Gesture Detection In Lecture Videos By Combining Visual, Speech And Electronic Slides, Feng Wang, Chong-Wah Ngo, Ting-Chuen Pong Jul 2006

Prediction-Based Gesture Detection In Lecture Videos By Combining Visual, Speech And Electronic Slides, Feng Wang, Chong-Wah Ngo, Ting-Chuen Pong

Research Collection School Of Computing and Information Systems

This paper presents an efficient algorithm for gesture detection in lecture videos by combining visual, speech and electronic slides. Besides accuracy, response time is also considered to cope with the efficiency requirements of real-time applications. Candidate gestures are first detected by visual cue. Then we modifity HMM models for complete gestures to predict and recognize incomplete gestures before the whole gestures paths are observed. Gesture recognition is used to verify the results of gesture detection. The relations between visual, speech and slides are analyzed. The correspondence between speech and gesture is employed to improve the accuracy and the responsiveness of …

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The Law Of International Commercial Arbitration In Singapore, Warren B. Chik Jul 2006

The Law Of International Commercial Arbitration In Singapore, Warren B. Chik

Research Collection Yong Pung How School Of Law

The Singapore dispute resolution landscape entered the new millennium with the reconstruction of the dual carriageway for arbitration. In 2002, the old road to arbitral resolution of disputes ( i.e. , the old Arbitration Act and the old International Arbitration Act ) were reconstructed and what emerged were two updated legislations: the Arbitration Act and the International Arbitration Act . At about the same time, the Singapore International Arbitration Centre (SIAC) also diversified with the introduction of a new set of Domestic Arbitration Rules.

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Exchange-Rate Systems And Interest-Rate Behaviour: The Experience Of Hong Kong And Singapore, Yiu Kuen Tse, Paul S. L. Yip Jul 2006

Exchange-Rate Systems And Interest-Rate Behaviour: The Experience Of Hong Kong And Singapore, Yiu Kuen Tse, Paul S. L. Yip

Research Collection School Of Economics

The Currency Board System in Hong Kong and the monitoring band system in Singapore are important benchmarks for two different exchange-rate systems. In this paper we consider the implications of the two exchange-rate systems on the interest-rate behaviour of the two economies. We examine the domestic–US interest differentials under the two exchange-rate regimes during the Asian Financial Crisis as well as the pre-and post-crisis periods. Using a bivariate generalized autoregressive conditional heteroscedasticity model, we also investigate whether there is any change in the correlation between the domestic and US interest rates due to the Asian Financial Crisis.

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Mobile Healthcare Informatics, Keng Siau, Zixing Shen Jul 2006

Mobile Healthcare Informatics, Keng Siau, Zixing Shen

Research Collection School Of Computing and Information Systems

Advances in wireless technology give pace to the rapid development of mobile applications. The coming mobile revolution will bring dramatic and fundamental changes to our daily life. It will influence the way we live, the way we do things, and the way we take care of our health. For the healthcare industry, mobile applications provide a new frontier in offering better care and services to patients, and a more flexible and mobile way of communicating with suppliers and patients. Mobile applications will provide important real time data for patients, physicians, insurers, and suppliers. In addition, it will revolutionalize the way …

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A Novel Privacy Preserving Authentication And Access Control Scheme For Pervasive Computing Environments, K. Ren, Wenjing Lou, K. Kim, Robert H. Deng Jul 2006

A Novel Privacy Preserving Authentication And Access Control Scheme For Pervasive Computing Environments, K. Ren, Wenjing Lou, K. Kim, Robert H. Deng

Research Collection School Of Computing and Information Systems

Privacy and security are two important but seemingly contradictory objectives in a pervasive computing environment (PCE). On one hand, service providers want to authenticate legitimate users and make sure they are accessing their authorized services in a legal way. On the other hand, users want to maintain the necessary privacy without being tracked down for wherever they are and whatever they are doing. In this paper, a novel privacy preserving authentication and access control scheme to secure the interactions between mobile users and services in PCEs is proposed. The proposed scheme seamlessly integrates two underlying cryptographic primitives, namely blind signature …

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Authenticating Multi-Dimensional Query Results In Data Publishing, Weiwei Cheng, Hwee Hwa Pang, Kian-Lee Tan Jul 2006

Authenticating Multi-Dimensional Query Results In Data Publishing, Weiwei Cheng, Hwee Hwa Pang, Kian-Lee Tan

Research Collection School Of Computing and Information Systems

In data publishing, the owner delegates the role of satisfying user queries to a third-party publisher. As the publisher may be untrusted or susceptible to attacks, it could produce incorrect query results. This paper introduces a mechanism for users to verify that their query answers on a multi-dimensional dataset are correct, in the sense of being complete (i.e., no qualifying data points are omitted) and authentic (i.e., all the result values originated from the owner). Our approach is to add authentication information into a spatial data structure, by constructing certified chains on the points within each partition, as well as …

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Mabs: Spreadsheet– Based Decision Support For Precision Marketing, Bert De Reyck, Zeger Degraeve Jun 2006

Mabs: Spreadsheet– Based Decision Support For Precision Marketing, Bert De Reyck, Zeger Degraeve

Research Collection Lee Kong Chian School Of Business

In this paper, we describe a decision support system developed for automatically scheduling and optimising broadcasts of advertisements to mobile phones via SMS (Short Message Service) text messaging. The system, MABS or “Mobile Advertising Broadcast Scheduler”, is developed in Microsoft Excel with a link to Lingo, a modelling language and IP solver. It was developed for a London-based company specialized in location-sensitive precision marketing via mobile phones. The system significantly reduced the time required to schedule the broadcasts, and resulted both in increased customer response and revenues.

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Substitution Or Symbolic Effects? A Reexamination Of Corporate Governance And Firm Performance, Xuesong Geng, Dean Hennessy, Kimberly Bates Jun 2006

Substitution Or Symbolic Effects? A Reexamination Of Corporate Governance And Firm Performance, Xuesong Geng, Dean Hennessy, Kimberly Bates

Research Collection Lee Kong Chian School Of Business

In this paper, we use a sample of large Canadian corporations to test the substitution hypothesis and the symbolic hypothesis. We find that the positive effect of board independence on firm performance declines as managerial ownership increases. This effect becomes non-positive when highly concentrated managerial ownership makes independent board more symbolic than effective.

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