Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Singapore Management University

Discipline
Keyword
Publication Year
Publication
Publication Type

Articles 7711 - 7740 of 8679

Full-Text Articles in Entire DC Network

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 …

Go to article

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 …

Go to article

Sex Similarities And Differences In Preferences For Short-Term Mates: What, Whether, And Why, Norman P. Li, Douglas T. Kenrick Mar 2006

Sex Similarities And Differences In Preferences For Short-Term Mates: What, Whether, And Why, Norman P. Li, Douglas T. Kenrick

Research Collection School of Social Sciences

Are there sex differences in criteria for sexual relationships? The answer depends on what question a researcher asks. Data suggest that, whereas the sexes differ in whether they will enter short-term sexual relationships, they are more similar in what they prioritize in partners for such relationships. However, additional data and context of other findings and theory suggest different underlying reasons. In Studies 1 and 2, men and women were given varying "mate budgets" to design short-term mates and were asked whether they would actually mate with constructed partners. Study 3 used a mate-screening paradigm. Whereas women have been found to …

Go to article

Fortifying Password Authentication In Integrated Healthcare Delivery Systems, Yanjiang Yang, Robert H. Deng, Feng Bao Mar 2006

Fortifying Password Authentication In Integrated Healthcare Delivery Systems, Yanjiang Yang, Robert H. Deng, Feng Bao

Research Collection School Of Computing and Information Systems

Integrated Delivery Systems (IDSs) now become a primary means of care provision in healthcare domain. However, existing password systems (under either the single-server model or the multi-server model) do not provide adequate security when applied to IDSs. We are thus motivated to present a practical password authentication system built upon a novel two-server model. We generalize the two-server model to an architecture of a single control server supporting multiple service servers, tailored to the organizational structure of IDSs. The underlying user authentication and key exchange protocols we propose are password-only, neat, efficient, and robust against off-line dictionary attacks mounted by …

Go to article

Wittgenstein, Moorean Absurdity And Its Disappearance From Speech, John N. Williams Mar 2006

Wittgenstein, Moorean Absurdity And Its Disappearance From Speech, John N. Williams

Research Collection School of Social Sciences

G. E. Moore famously observed that to say, I went to the pictures last Tuesday but I don't believe that I did would be absurd. Why should it be absurd of me to say something about myself that might be true of me? Moore suggested an answer to this, but as I will show, one that fails. Wittgenstein was greatly impressed by Moore's discovery of a class of absurd but possibly true assertions because he saw that it illuminates the logic of assertion. Wittgenstein suggests a promising relation of assertion to belief in terms of the idea that one expresses …

Go to article

Threading And Autodocumenting News Videos: A Promising Solution To Rapidly Browse News Topics, Xiao Wu, Chong-Wah Ngo, Qing Li Mar 2006

Threading And Autodocumenting News Videos: A Promising Solution To Rapidly Browse News Topics, Xiao Wu, Chong-Wah Ngo, Qing Li

Research Collection School Of Computing and Information Systems

This paper describes the techniques in threading and autodocumenting news stories according to topic themes. Initially, we perform story clustering by exploiting the duality between stories and textual-visual concepts through a co-clustering algorithm. The dependency among stories of a topic is tracked by exploring the textual-visual novelty and redundancy of stories. A novel topic structure that chains the dependencies of stories is then presented to facilitate the fast navigation of the news topic. By pruning the peripheral and redundant news stories in the topic structure, a main thread is extracted for autodocumentary

Go to article

Splash: Systematic Proteomics Laboratory Analysis And Storage Hub, Siaw Ling Lo, You Tao, Qingsong Lin, Shashikant B. Joshi, Maxey Chung, Choy Leong Hew Mar 2006

Splash: Systematic Proteomics Laboratory Analysis And Storage Hub, Siaw Ling Lo, You Tao, Qingsong Lin, Shashikant B. Joshi, Maxey Chung, Choy Leong Hew

Research Collection School Of Computing and Information Systems

In the field of proteomics, the increasing difficulty to unify the data format, due to the different platforms/instrumentation and laboratory documentation systems, greatly hinders experimental data verification, exchange, and comparison. Therefore, it is essential to establish standard formats for every necessary aspect of proteomics data. One of the recently published data models is the proteomics experiment data repository [Taylor, C. F., Paton, N. W., Garwood, K. L., Kirby, P. D. et al., Nat. Biotechnol. 2003, 21, 247-254]. Compliant with this format, we developed the systematic proteomics laboratory analysis and storage hub (SPLASH) database system as an informatics infrastructure to support …

Go to article

Publicly Verifiable Ownership Protection For Relational Databases, Yingjiu Li, Robert H. Deng Mar 2006

Publicly Verifiable Ownership Protection For Relational Databases, Yingjiu Li, Robert H. Deng

Research Collection School Of Computing and Information Systems

Today, watermarking techniques have been extended from the multimedia context to relational databases so as to protect the ownership of data even after the data are published or distributed. However, all existing watermarking schemes for relational databases are secret key based, thus require a secret key to be presented in proof of ownership. This means that the ownership can only be proven once to the public (e.g., to the court). After that, the secret key is known to the public and the embedded watermark can be easily destroyed by malicious users. Moreover, most of the existing techniques introduce distortions to …

Go to article

Strategic Communication In Crisis Governance: Singapore’S Management Of The Sars Crisis, Jin Yan, Augustine Pang, Glen T. Cameron Mar 2006

Strategic Communication In Crisis Governance: Singapore’S Management Of The Sars Crisis, Jin Yan, Augustine Pang, Glen T. Cameron

Research Collection Lee Kong Chian School Of Business

The contingency theory of conflict management and current crisis management literature are integrated in this paper to examine how crisis has been communi-cated and managed by the Singapore government and what kinds of strategies arose during the various stages of the SARS crisis life-cycle. Findings show that the Singapore government played a predominant role in managing how its multiple publics perceived the crisis by extensive communication through the news media. The media, in turn, playing a supporting nation-building role, assisted the government's management and communication of the crisis. To effectively manage the perception and emotion of the various public, the …

Go to article

Different Wrongs, Different Remedies? Reactions To Organizational Remedies After Procedural And Interactional Injustice, Jochen Reb, Barry M. Goldman, Laura J. Kray, Russell Cropanzano Mar 2006

Different Wrongs, Different Remedies? Reactions To Organizational Remedies After Procedural And Interactional Injustice, Jochen Reb, Barry M. Goldman, Laura J. Kray, Russell Cropanzano

Research Collection Lee Kong Chian School Of Business

To alleviate the negative effects of workplace unfairness and resulting conflict, organizations can take remedial action to atone for a perceived injustice. We argue that the effectiveness of organizational remedies may depend on the match between type of injustice perceived and type of remedy offered. Specifically, based on the multiple needs model of justice (Cropanzano, Byrne, Bobocel, & Rupp, 2001), we expect procedural injustice to be particularly associated with preference for instrumental remedies that address the need for control. On the other hand, interactional injustice should be particularly associated with preference for punitive remedies that address the need for meaning. …

Go to article

Regulation And Freedom In Global Business Education, Stefano Harney, Cliff Oswick Mar 2006

Regulation And Freedom In Global Business Education, Stefano Harney, Cliff Oswick

Research Collection Lee Kong Chian School Of Business

Purpose: This paper seeks to confront the orthodoxy of global business education with some insights from postcolonial theory in order to develop a new critical pedagogy adequate for a global sociology of management and accounting. Design/methodology/approach: Reviewing the state of play in postcolonial theory and noting the new politicisation in that field, the paper asks what relevance this politicisation might have for an alternative to orthodox global business education. Findings: The paper finds that the texts available to postcolonial theory present a wealth beyond the regulation of colonial and neo‐colonial regimes and in contrast critical management studies do not have …

Go to article

Affinities In The Socio-Political Thought Of Rorty And Levinas, Eduard Jordaan Mar 2006

Affinities In The Socio-Political Thought Of Rorty And Levinas, Eduard Jordaan

Research Collection School of Social Sciences

This article considers the affinities in the socio-political thought of Emmanuel Levinas and Richard Rorty. The writings of both display considerable concern for the suffering of others. Both authors note the importance of a self-critical subject becoming more aware of its own injustice as very important for recognizing our responsibilities to others. Furthermore, both stress the importance of recognizing the other outside of the usual, objectifying categories, since it is the uniqueness of the other that reminds us of our responsibility for the other. Both writers view the liberal state as the best political forum in which to realize a …

Go to article

Expectations, Animal Spirits, And Evolutionary Dynamics, Angelo Antoci, Massimiliano Landi, Pier Luigi Sacco Mar 2006

Expectations, Animal Spirits, And Evolutionary Dynamics, Angelo Antoci, Massimiliano Landi, Pier Luigi Sacco

Research Collection School Of Economics

We consider a (deterministic) evolutionary model where players have dynamic expectations about the strategy distribution. We provide a global analysis of the co-evolution of play and expectations for a generic two-by-two game. Besides the the typical indeterminacy of the evolutionary dynamics, we find some other ones: for any initial strategy configuration the dynamics can converge to any asymptotically stable fixed point, for different initial values of the expectations. Moreover, starting from the same initial pair of strategy configuration and values of expectations, the dynamics may lead to different asymptotically stable fixed points for different parameters of the expectations.

Go to article

Employee Screening: Theory And Evidence, Fali Huang, Peter Cappelli Mar 2006

Employee Screening: Theory And Evidence, Fali Huang, Peter Cappelli

Research Collection School Of Economics

Arguably the fundamental problem faced by employers is how to elicit effort from employees. Most models suggest that employers meet this challenge by monitoring employees carefully to prevent shirking. But there is another option that relies on heterogeneity across employees, and that is to screen job candidates to find workers with a stronger work ethic who require less monitoring. This should be especially useful in work systems where monitoring by supervisors is more difficult, such as teamwork systems. We analyze the relationship between screening and monitoring in the context of a principal-agent model and test the theoretical results using a …

Go to article

Profiting From Mean-Reverting Yield Curve Trading Strategies, Choong Tze Chua, Winston T. H. Koh, Krishna Ramaswamy Mar 2006

Profiting From Mean-Reverting Yield Curve Trading Strategies, Choong Tze Chua, Winston T. H. Koh, Krishna Ramaswamy

Research Collection School Of Economics

This article 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. Some mean-reverting strategies were found to have significant positive profits. Furthermore, the profitability of one of these strategies significantly outperforms, on a risk-adjusted basis, alternative strategies of an investment bond or equity index.

Go to article

Milky Way And Andromeda: Privacy, Confidentiality And Freedom Of Expression, George S. S. Wei Mar 2006

Milky Way And Andromeda: Privacy, Confidentiality And Freedom Of Expression, George S. S. Wei

Research Collection Yong Pung How School Of Law

This article examines the extent to which the law of confidence protects private personal information. In the UK, much of the impetus for greater protection comes from the European Convention on the Protection of Human Rights and Fundamental Freedoms. How privacy and freedom of expression are to be balanced either within the law of confidence or through the development of a new tort of privacy is a question that has given rise to much discussion in the courts and elsewhere. Developments in this area are the focus of this article together with the issue as to whether similar developments might …

Go to article

Underpriced Default Spread Exacerbates Market Crashes, Winston T. H. Koh, Roberto S. S. Mariano, Andrey Pavlov, Sock Yong Phang, Augustine H. H. Tan, Susan M. Wachter Mar 2006

Underpriced Default Spread Exacerbates Market Crashes, Winston T. H. Koh, Roberto S. S. Mariano, Andrey Pavlov, Sock Yong Phang, Augustine H. H. Tan, Susan M. Wachter

Research Collection School Of Economics

In this paper, we develop a specific observable symptom of a banking system that underprices the default spread in non-recourse asset-backed lending. Using three different data sets for 18 countries and property types, we find that, following a negative demand shock, the “underpricing” economies experience far deeper asset market crashes than economies in which the put option is correctly priced. Furthermore, only one of the countries in our sample continues to exhibit the underpricing symptom following a market crash. This indicates that market crashes have a cleansing effect and eliminate underpricing at least for a period of time. This makes …

Go to article

Multivariate Stochastic Volatility: A Review, Manabu Asai, Michael Mcaleer, Jun Yu Mar 2006

Multivariate Stochastic Volatility: A Review, Manabu Asai, Michael Mcaleer, Jun Yu

Research Collection School Of Economics

The literature on multivariate stochastic volatility (MSV) models has developed significantly over the last four years. This paper reviews the substantial literature on specification, estimation, and evaluation of MSV models. A wide range of MSV models is presented according to various categories, namely, (i) asymmetric models, (ii) factor models, (iii) time-varying correlation models, and (iv) alternative MSV specifications, including models based on the matrix exponential transformation, the Cholesky decomposition, and the Wishart autoregressive process. Alternative methods of estimation, including quasi-maximum likelihood, simulated maximum likelihood, and Markov chain Monte Carlo methods, are discussed and compared. Various methods of diagnostic checking and …

Go to article

Robust Classification Of Eeg Signal For Brain-Computer Interface, Manoj Thulasidas, Cuntai Guan, Jiankang Wu Mar 2006

Robust Classification Of Eeg Signal For Brain-Computer Interface, Manoj Thulasidas, Cuntai Guan, Jiankang Wu

Research Collection School Of Computing and Information Systems

We report the implementation of a text input application (speller) based on the P300 event related potential. We obtain high accuracies by using an SVM classifier and a novel feature. These techniques enable us to maintain fast performance without sacrificing the accuracy, thus making the speller usable in an online mode. In order to further improve the usability, we perform various studies on the data with a view to minimizing the training time required. We present data collected from nine healthy subjects, along with the high accuracies (of the order of 95% or more) measured online. We show that the …

Go to article

A Semi-Parametric Estimator For Censored Selection Models With Endogeneity, Myoung-Jae Lee, Francis Vella Feb 2006

A Semi-Parametric Estimator For Censored Selection Models With Endogeneity, Myoung-Jae Lee, Francis Vella

Research Collection School Of Economics

We propose a semi-parametric least-squares estimator for a censored-selection (type 3 tobit) model under the mean independence of the outcome equation error u from the regressors given the selection indicator and its error term ɛ. This assumption is relatively weak in comparison to alternative estimators for this model and allows certain unknown forms of heteroskedasticity, an asymmetric error distribution, and an arbitrary relationship between the u and ɛ. The estimator requires only one-dimensional smoothing on the estimate of ɛ. We generalize the estimator to allow for an endogenous regressor whose equation contains an error w related to u and discuss …

Go to article

Strategy Meets Evolution: Games Suppliers And Producers Play, Brishti Guha Feb 2006

Strategy Meets Evolution: Games Suppliers And Producers Play, Brishti Guha

Research Collection School Of Economics

Final goods producers, who may be intrinsically honest (a behavioral type) or opportunistic (strategic), play a repeated game of imperfect information with suppliers of an input of variable (and non-verifiable) quality. Returns to cheating are increasing in the proportion of intrinsically honest producers. If producers compete for another scarce input, adverse selection reduces this proportion enough to enforce universal honesty, whether at a high or a low quality equilibrium. This mechanism limits the proportion of behavioral types in the population of producers over a wide range of parameters: despite their inability to compete with opportunists, they are not wholly wiped …

Go to article

More Efficient Estimation In Nonparametric Regression With Nonparametric Autocorrelated Errors, Liangjun Su, Aman Ullah Feb 2006

More Efficient Estimation In Nonparametric Regression With Nonparametric Autocorrelated Errors, Liangjun Su, Aman Ullah

Research Collection School Of Economics

We define a three-step procedure for more efficient estimation of the nonparametric regression mean with nonparametric autocorrelated errors. The procedure is based upon a nonparametric prewhitening transformation of the dependent variable that has to be estimated from the data by a local polynomial technique. We establish the asymptotic distribution of our estimator under weak dependence conditions and show that it is more efficient than the conventional local polynomial estimator. Furthermore, we consider criterion functions based on the linear exponential family, which include the local polynomial least squares criterion as a special case. Simulation evidence suggests that significant gains can be …

Go to article

Scalable Authentication Of Mpeg-4 Streams, Yongdong Wu, Robert H. Deng Feb 2006

Scalable Authentication Of Mpeg-4 Streams, Yongdong Wu, Robert H. Deng

Research Collection School Of Computing and Information Systems

This paper presents three scalable and efficient schemes for authenticating MPEG-4 streams: the Flat Authentication Scheme, the Progressive Authentication Scheme, and the Hierarchical Authentication Scheme. All the schemes allow authentication of MPEG-4 streams over lossy networks by integrating seamlessly digital signatures and erasure correction coding with MPEG-4's fine granular scalability. A prominent feature of our schemes is their "sign once, verify many ways" property, i.e., they generate only one digital signature per compressed MPEG-4 object group, but allow clients to verify the authenticity of any down-scaled version of the original signed object group.

Go to article

Moore's Paradoxes And Conscious Belief, John N. Williams Feb 2006

Moore's Paradoxes And Conscious Belief, John N. Williams

Research Collection School of Social Sciences

For Moore, it is a paradox that although I would be absurd in asserting that (it is raining but I don’t believe it is) or that (it is raining but I believe it isn’t), such assertions might be true. But I would be also absurd in judging that the contents of such assertions are true. I argue for the strategy of explaining the absurdity of Moorean assertion in terms of conscious Moorean belief. Only in this way may the pathology of Moorean absurdity be adequately explained in terms of self-contradiction. David Rosenthal disagrees with this strategy. Ironically, his higher-order thought …

Go to article

Energy Efficiency And Capacity For Tcp Traffic In Multi-Hop Wireless Networks, Sorav Bansal, Rajeev Shorey, Rajeev Gupta, Archan Misra Feb 2006

Energy Efficiency And Capacity For Tcp Traffic In Multi-Hop Wireless Networks, Sorav Bansal, Rajeev Shorey, Rajeev Gupta, Archan Misra

Research Collection School Of Computing and Information Systems

We study the performance metrics associated with TCP-regulated traffic in multi-hop, wireless networks that use a common physical channel (e.g., IEEE 802.11). In contrast to earlier analyses, we focus simultaneously on two key operating metrics—the energy efficiency and the transport-layer (TCP) throughput. Using analysis and simulations, we show how these metrics are strongly influenced by the radio transmission range of individual nodes. Due to tradeoffs between the individual packet transmission energy and the likelihood of retransmissions, the total energy consumption is a convex function of the number of hops (and hence, of the transmission range). On the other hand, the …

Go to article

Effects Of Technological Improvement In The Ict Producing Sector On Business Activity, Hian Teck Hoon, Edmund S. Phelps Feb 2006

Effects Of Technological Improvement In The Ict Producing Sector On Business Activity, Hian Teck Hoon, Edmund S. Phelps

Research Collection School Of Economics

It seems to be taken for granted by many commentators that the sharp decline in prices of computers, telecommunications equipment and software resulting from the technological improvements in the information and communications technology (ICT)-producing sector is good for jobs and is a major driving force behind the non-inflationary employment miracle and booming stock market in the latter half of the nineties in the U.S. and their recurrence since 2004. We show that, in our model, a technical improvement in the ICT-producing sector by itself cannot explain a simultaneous increase in employment and a rise in firms’ valuation (or Tobin’s Q …

Go to article

Functional Sunspot Equilibria, Shurojit Chatterji, Subir Chattopadhyay Feb 2006

Functional Sunspot Equilibria, Shurojit Chatterji, Subir Chattopadhyay

Research Collection School Of Economics

Consider a one step forward looking model where agents believe that the equilibrium values of the state variable are determined by a function whose domain is the current value of the state variable and whose range is the value for the subsequent period. An agent's forecast for the subsequent period uses the belief, where the function that is chosen is allowed to depend on the current realization of an extrinsic random process, and is made with knowledge of the past values of the state variable but not the current value. The paper provides (and characterizes) the conditions for the existence …

Go to article

Interface Between Ip And Competition Law In Taiwan, Kung-Chung Liu Feb 2006

Interface Between Ip And Competition Law In Taiwan, Kung-Chung Liu

Research Collection Yong Pung How School Of Law

The modernization of Taiwan’s intellectual property (IP) laws has been most marked in the last 10 to 15 years.] During that period, Taiwan also responded to U.S. Section 301 pressure by enacting and enforcing the Fair Trade Act of 1991, a general competition law. The issue of the interface between IP and antitrust law has gradually gained sigdcance in the last couple of years. To some extent, as its development in Taiwan testifies, competition law has circumscribed the scope of IP laws and inacted a spd-over effect on the IP laws. The ramification of competition law in Taiwan with regard …

Go to article

Design Synthesis From Interaction And State-Based Specifications, Jun Sun, Jin Song Dong Jan 2006

Design Synthesis From Interaction And State-Based Specifications, Jun Sun, Jin Song Dong

Research Collection School Of Computing and Information Systems

Interaction-based and state-based modeling are two complementary approaches of behavior modeling. The former focuses on global interactions between system components. The latter concentrates on the internal states of individual components. Both approaches have been proven useful in practice. One challenging and important research objective is to combine the modeling power of both effectively and then use the combination as the basis for automatic design synthesis. We present a combination of interaction-based and state-based modeling, namely, Live Sequence Charts and Z, for system specification. We then propose a way of generating distributed design from the combinations. Our approach handles systems with …

Go to article

Predicting A Currency Crisis Alternative Approaches And Applications To The Philippines, Fernando Antonio Iv Castillo Jan 2006

Predicting A Currency Crisis Alternative Approaches And Applications To The Philippines, Fernando Antonio Iv Castillo

Dissertations and Theses Collection (Open Access)

An arrival of a currency crisis can be anticipated through a comprehensive and properly specified Early Warning System (“EWS”). The costs that entail with experiencing a currency crisis far exceed the costs of spending a considerable amount of time to developing an EWS. In a report done by the IMF(1998), they estimated that emerging economies suffer an 8% cumulative loss in real output during a severe currency crisis. Likewise, evidence suggests that a simple look at traditional market indicators of currency and default risks will not provide much advance warning of an impending currency crisis. In a study done by …

Go to article

First Prev Next Last