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Verifying Completeness Of Relational Query Results In Data Publishing, Hwee Hwa Pang, Arpit Jain, Krithi Ramamritham, Kian-Lee Tan Jun 2005

Verifying Completeness Of Relational Query Results In Data Publishing, Hwee Hwa Pang, Arpit Jain, Krithi Ramamritham, 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. In this paper, we introduce a scheme for users to verify that their query results are complete (i.e., no qualifying tuples are omitted) and authentic (i.e., all the result values originated from the owner). The scheme supports range selection on key and non-key attributes, project as well as join queries on relational databases. Moreover, the proposed scheme complies with access control policies, is computationally secure, and can be …

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Breaking Public Key Cryptosystems On Tamper Resistant Devices In The Presence Of Transient Faults, Feng Bao, Robert H. Deng, Y. Han, A. Jeng, Arcot Desai Narasimhalu, T. Ngair Jun 2005

Breaking Public Key Cryptosystems On Tamper Resistant Devices In The Presence Of Transient Faults, Feng Bao, Robert H. Deng, Y. Han, A. Jeng, Arcot Desai Narasimhalu, T. Ngair

Research Collection School Of Computing and Information Systems

In this paper we present a method of attacking public-key cryptosystems (PKCs) on tamper resistant devices. The attack makes use of transient faults and seems applicable to many types of PKCs. In particular, we show how to attack the RSA, the E1Gamal signature scheme, the Schnorr signature scheme, and the DSA. We also present some possible methods to counter the attack.

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A Semi-Supervised Active Learning Framework For Image Retrieval, Steven Hoi, Michael R. Lyu Jun 2005

A Semi-Supervised Active Learning Framework For Image Retrieval, Steven Hoi, Michael R. Lyu

Research Collection School Of Computing and Information Systems

Although recent studies have shown that unlabeled data are beneficial to boosting the image retrieval performance, very few approaches for image retrieval can learn with labeled and unlabeled data effectively. This paper proposes a novel semi-supervised active learning framework comprising a fusion of semi-supervised learning and support vector machines. We provide theoretical analysis of the active learning framework and present a simple yet effective active learning algorithm for image retrieval. Experiments are conducted on real-world color images to compare with traditional methods. The promising experimental results show that our proposed scheme significantly outperforms the previous approaches.

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The Effect Of Remanufacturing On Procurement Decisions For Resellers In Secondary Markets, Andreas Robotis, Shantanu Bhattacharya, Luk N. Van Wassenhove Jun 2005

The Effect Of Remanufacturing On Procurement Decisions For Resellers In Secondary Markets, Andreas Robotis, Shantanu Bhattacharya, Luk N. Van Wassenhove

Research Collection Lee Kong Chian School Of Business

The role of remanufacturing as a competitive tool for firms has been reflected in a number of studies to show that remanufacturing can reduce the unit cost of production by reusing components. However, the fact that remanufacturing can be used as a strategic tool for serving secondary markets as well has not been acknowledged in the literature. In this paper, we study the use of remanufacturing as a tool to serve secondary markets. Specifically, we model the case of a reseller who procures used products based on an older generation of technology from an advanced market and then uses one …

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Singapore's Pursuit Of Location Advantages In Indonesia And Vietnam, Caroline Yeoh, . David, Siang Yeung Wong Jun 2005

Singapore's Pursuit Of Location Advantages In Indonesia And Vietnam, Caroline Yeoh, . David, Siang Yeung Wong

Research Collection Lee Kong Chian School Of Business

No abstract provided.

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Exporting Expertise: Singapore's Gambit In Vietnam Revisited, Caroline Yeoh, Ai Lin Leong, Xun Cai Jun 2005

Exporting Expertise: Singapore's Gambit In Vietnam Revisited, Caroline Yeoh, Ai Lin Leong, Xun Cai

Research Collection Lee Kong Chian School Of Business

Infrastructure can be unreliable and administration subject to corruption in Asia’s rapidly emerging economies. This context presented Singapore with unique opportunities to export its expertise to locations where these attributes are less certain, through the provision of superior infrastructure, the ability to negotiate investment concessions and, where existing, through the links to influential business groups in the investment location. This strategic initiative is further premised on the perception that Singapore’s positive reputation with multinationals, as well as ‘guanxi’, or connections, with Asian business networks, will give the industrial-township projects a marketing advantage. Their progress is a litmus test of Singapore’s …

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Interaction Of Technology Choice And Financial Risk Management Under Costly External Financing, Onur Boyabatli, L. Beril Toktay Jun 2005

Interaction Of Technology Choice And Financial Risk Management Under Costly External Financing, Onur Boyabatli, L. Beril Toktay

Research Collection Lee Kong Chian School Of Business

This paper analyzes the integrated operational and financial risk management portfolio of a firm that determines whether to use flexible or dedicated technology and whether to undertake financial risk management or not. The risk management value of flexible technology is due to its risk pooling benefit under demand uncertainty. The financial risk management motivation comes from the existence of deadweight costs of external financing due to capital market imperfections. Financial risk management has a fixed cost, while technology investment incurs both fixed and variable costs. The firm's limited budget, which depends partly on a tradable asset, can be increased by …

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It's All Right To Be Wrong, Sometimes, Seow Hon Tan May 2005

It's All Right To Be Wrong, Sometimes, Seow Hon Tan

Research Collection Yong Pung How School Of Law

Racist comments made by some youths have spawned many reactions from Singaporeans. This presents another interesting issue: Do these reactions themselves evince the kind of intolerance of a diversity of opinions which they are attacking? When and how can we differ without being intolerant and disrespectful?

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What Makes Knowledge Sharing In Organizations Tick? An Empirical Study, Yue Wah Chay, Thomas Menkhoff, Benjamin Loh, Hans-Dieter Evers May 2005

What Makes Knowledge Sharing In Organizations Tick? An Empirical Study, Yue Wah Chay, Thomas Menkhoff, Benjamin Loh, Hans-Dieter Evers

Research Collection Lee Kong Chian School Of Business

No abstract provided.

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The Singapore Edge In India's Silicon Valley: New Insights?, Caroline Yeoh, David David May 2005

The Singapore Edge In India's Silicon Valley: New Insights?, Caroline Yeoh, David David

Research Collection Lee Kong Chian School Of Business

No abstract provided.

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Dynamically Optimized Context In Recommender Systems, Ghim-Eng Yap, Ah-Hwee Tan, Hwee Hwa Pang May 2005

Dynamically Optimized Context In Recommender Systems, Ghim-Eng Yap, Ah-Hwee Tan, Hwee Hwa Pang

Research Collection School Of Computing and Information Systems

Traditional approaches to recommender systems have not taken into account situational information when making recommendations, and this seriously limits the relevance of the results. This paper advocates context-awareness as a promising approach to enhance the performance of recommenders, and introduces a mechanism to realize this approach. We present a framework that separates the contextual concerns from the actual recommendation module, so that contexts can be readily shared across applications. More importantly, we devise a learning algorithm to dynamically identify the optimal set of contexts for a specific recommendation task and user. An extensive series of experiments has validated that our …

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Synthesizing E-Government Stage Models – A Meta-Synthesis Based On Meta-Ethnography Approach, Keng Siau, Y. Long May 2005

Synthesizing E-Government Stage Models – A Meta-Synthesis Based On Meta-Ethnography Approach, Keng Siau, Y. Long

Research Collection School Of Computing and Information Systems

The growing interest in e-government raises the question of stages in e-government development. A few stage models for e-government have been proposed. Without a common e-government stage model, different research in e-government may be based on different stage models. This presents a difficulty in comparing and understanding different research results. In this research, we synthesize the existing e-government stage models so that there is a common frame of reference for researchers and practitioners in the area.

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Synthesizing E-Government Stage Models – A Meta-Synthesis Based On Meta-Ethnography Approach, Keng Siau, Y. Long May 2005

Synthesizing E-Government Stage Models – A Meta-Synthesis Based On Meta-Ethnography Approach, Keng Siau, Y. Long

Research Collection School Of Computing and Information Systems

The growing interest in e-government raises the question of stages in e-government development. A few stage models for e-government have been proposed. Without a common e-government stage model, different research in e-government may be based on different stage models. This presents a difficulty in comparing and understanding different research results. In this research, we synthesize the existing e-government stage models so that there is a common frame of reference for researchers and practitioners in the area.

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Protecting Group Dynamic Information In Large Scale Multicast Groups, Yongdong Wu, Tieyan Li, Robert H. Deng May 2005

Protecting Group Dynamic Information In Large Scale Multicast Groups, Yongdong Wu, Tieyan Li, Robert H. Deng

Research Collection School Of Computing and Information Systems

Existing key management schemes can secure group communication efficiently, but are failed on protecting the Group Dynamic Information (GDI) that may undermine group privacy. Recently, Sun et al. proposed a scheme to hide the GDI with batch updating and phantom members inserting so that an adversary is not able to estimate the number of group members. In this paper, we first point out that their scheme is only applicable in departure-only group communication instead of the common conference groups. Secondly, we introduce our method of estimating the group size at a higher confidence level given a prior departure probability. Further, …

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Tosa: A Near-Optimal Scheduling Algorithm For Multi-Channel Data Broadcast, Baihua Zheng, Xia Xu, Xing Jin, Dik Lun Lee May 2005

Tosa: A Near-Optimal Scheduling Algorithm For Multi-Channel Data Broadcast, Baihua Zheng, Xia Xu, Xing Jin, Dik Lun Lee

Research Collection School Of Computing and Information Systems

Wireless broadcast is very suitable for delivering information to a large user population. In this paper, we concentrate on data allocation methods for multiple broadcast channels. To the best of our knowledge, this is the first allocation model that takes into the consideration of items' access frequencies, items' lengths. and bandwidth of different channels. We first derive the optimal average expected delay for multiple channels for the general case where data access frequencies, data sizes, and channel bandwidths can all be non-uniform. Second, we develop TOSA, a multi-channel allocation method that does not assume a uniform broadcast schedule for data …

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Live Data Views: Programming Pervasive Applications That Use “Timely” And “Dynamic” Data, Jay Black, Paul Castro, Archan Misra, Jerome White May 2005

Live Data Views: Programming Pervasive Applications That Use “Timely” And “Dynamic” Data, Jay Black, Paul Castro, Archan Misra, Jerome White

Research Collection School Of Computing and Information Systems

In the absence of generic programming abstractions for dynamic data in most enterprise programming environments, individual applications treat data streams as a special case requiring custom programming. With the growing number of live data sources such as RSS feeds, messaging and presence servers, multimedia streams, and sensor data. a general-purpose client-server programming model is needed to easily incorporate live data into applications. In this paper, we present Live Data Views, a programming abstraction that represents live data as a time-windowed view over a set of data streams. Live Data Views allow applications to create and retrieve stateful abstractions of dynamic …

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The Operational Validity Of A Video-Based Situational Judgment Test For Medical College Admissions: Illustrating The Importance Of Matching Predictor And Criterion Construct Domains, Filip Lievens, Tine Buyse, Paul R. Sackett May 2005

The Operational Validity Of A Video-Based Situational Judgment Test For Medical College Admissions: Illustrating The Importance Of Matching Predictor And Criterion Construct Domains, Filip Lievens, Tine Buyse, Paul R. Sackett

Research Collection Lee Kong Chian School Of Business

This study is part of a trend of examining noncognitive predictors, for example, a situational judgment test (SJT), as supplements to cognitive predictors for making college admission decisions. The authors examined criterion data over multiple academic years and universities. The criterion domain was broadly conceptualized, including both cognitive and interpersonal domains. The sample consisted of 7,197 candidates of the Medical and Dental Studies Admission Exam in Belgium. Results confirmed the importance of cognitive predictors. A video-based SJT was differentially valid for predicting overall grade point average for different curricula. The SJT showed incremental validity over cognitively oriented measures for curricula …

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Minimum Energy Reliable Paths Using Unreliable Wireless Links, Qunfeng Dong, Suman Banerjee, Micah Adler, Archan Misra May 2005

Minimum Energy Reliable Paths Using Unreliable Wireless Links, Qunfeng Dong, Suman Banerjee, Micah Adler, Archan Misra

Research Collection School Of Computing and Information Systems

We address the problem of energy-efficient reliable wireless communication in the presence of unreliable or lossy wireless link layers in multi-hop wireless networks. Prior work [1] has provided an optimal energy efficient solution to this problem for the case where link layers implement perfect reliability. However, a more common scenario --- a link layer that is not perfectly reliable, was left as an open problem. In this paper we first present two centralized algorithms, BAMER and GAMER, that optimally solve the minimum energy reliable communication problem in presence of unreliable links. Subsequently we present a distributed algorithm, DAMER, that approximates …

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Mining Mobile Group Patterns: A Trajectory-Based Approach, San-Yih Hwang, Ying-Han Liu, Jeng-Kuen Chiu, Ee Peng Lim May 2005

Mining Mobile Group Patterns: A Trajectory-Based Approach, San-Yih Hwang, Ying-Han Liu, Jeng-Kuen Chiu, Ee Peng Lim

Research Collection School Of Computing and Information Systems

In this paper, we present a group pattern mining approach to derive the grouping information of mobile device users based on a trajectory model. Group patterns of users are determined by distance threshold and minimum time duration. A trajectory model of user movement is adopted to save storage space and to cope with untracked or disconnected location data. To discover group patterns, we propose ATGP algorithm and TVG-growth that are derived from the Apriori and VG-growth algorithms respectively.

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Information Dissemination Via Wireless Broadcast, Baihua Zheng, Dik Lun Lee May 2005

Information Dissemination Via Wireless Broadcast, Baihua Zheng, Dik Lun Lee

Research Collection School Of Computing and Information Systems

Unrestricted mobility adds a new dimension to data access methodology--- one that must be addressed before true ubiquity can be realized.

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Audit Quality, Legal And Disclosure Environments, And Analysts' Forecast Accuracy: Some International Evidence, Jong-Hag Choi, Tony Kang, Young Koan Kwon, Yoonseok Zang May 2005

Audit Quality, Legal And Disclosure Environments, And Analysts' Forecast Accuracy: Some International Evidence, Jong-Hag Choi, Tony Kang, Young Koan Kwon, Yoonseok Zang

Research Collection School Of Accountancy

In this study, we investigate the relation between the quality of external audit and earnings predictability of firms situated in different legal and disclosure environments around the world. In a sample of multinational firms cross-listed in the United States, we find that the association between audit quality and forecast accuracy is stronger in weak legal and disclosure environments than in strong legal and disclosure environments. We interpret these results as suggesting that audit service can serve as an alternative device to improve market participants' information environment in weak legal and disclosure environments.

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Firm Ownership Structure And Intellectual Capital Disclosures, Stephen Firer, S. M. Williamson May 2005

Firm Ownership Structure And Intellectual Capital Disclosures, Stephen Firer, S. M. Williamson

Research Collection School Of Accountancy

The primary purpose of this study is to investigate the association between three ownership structure characteristics and voluntary intellectual capital (IC) disclosure practices. Data for this study is hand collected from the 2000 annual reports of 390 Singapore publicly traded firms. Empirical results indicate Singapore publicly traded firms more closely owned were less likely to voluntarily disclose IC related information than were those where executive directors had smaller holdings in the entity. Finally, findings indicate government linked corporations (GLCs) will likely make more voluntary IC disclosures than non-GLCs. Overall, this study makes several unique contributions to the literature. First, the …

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Non-Market Leadership Experience And Labor Market Success: Evidence From Military Rank, Myoung-Jae Lee, Chun Seng Yip May 2005

Non-Market Leadership Experience And Labor Market Success: Evidence From Military Rank, Myoung-Jae Lee, Chun Seng Yip

Research Collection School Of Economics

There has been much recent interest in the effects of pre and non-market skills on future labor market outcomes. This paper examines one such effect: the effect on future wages of military leadership experience among Vietnam generation American men. We study rank, not just veteran status. We argue that rank is a good measure of pre-market leadership skills because of the clear military hierarchy and the primarily youth experience of Vietnam service. Two sources of selection bias are accounted for: non-random military entry and eventual rank attained. We apply a modified 2-stage parametric sample selection method. The rank premia on …

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Dynamically-Optimized Context In Recommender Systems, Ghim-Eng Yap, Ah-Hwee Tan, Hwee-Hwa Pang May 2005

Dynamically-Optimized Context In Recommender Systems, Ghim-Eng Yap, Ah-Hwee Tan, Hwee-Hwa Pang

Research Collection School Of Computing and Information Systems

Traditional approaches to recommender systems have not taken into account situational information when making recommendations, and this seriously limits the relevance of the results. This paper advocates context-awareness as a promising approach to enhance the performance of recommenders, and introduces a mechanism to realize this approach. We present a framework that separates the contextual concerns from the actual recommendation module, so that contexts can be readily shared across applications. More importantly, we devise a learning algorithm to dynamically identify the optimal set of contexts for a specific recommendation task and user. An extensive series of experiments has validated that our …

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Event-Driven Document Selection For Terrorism, Zhen Sun, Ee Peng Lim, Kuiyu Chang, Teng-Kwee Ong, Rohan Kumar Gunaratna May 2005

Event-Driven Document Selection For Terrorism, Zhen Sun, Ee Peng Lim, Kuiyu Chang, Teng-Kwee Ong, Rohan Kumar Gunaratna

Research Collection School Of Computing and Information Systems

In this paper, we examine the task of extracting information about terrorism related events hidden in a large document collection. The task assumes that a terrorism related event can be described by a set of entity and relation instances. To reduce the amount of time and efforts in extracting these event related instances, one should ideally perform the task on the relevant documents only. We have therefore proposed some document selection strategies based on information extraction (IE) patterns. Each strategy attempts to select one document at a time such that the gain of event related instance information is maximized. Our …

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Leveraging Global Resources: A Distributed Process Maturity Framework For Software Product Development, Narayan Ramasubbu, M. S. Krishnan, Prasad Kompalli May 2005

Leveraging Global Resources: A Distributed Process Maturity Framework For Software Product Development, Narayan Ramasubbu, M. S. Krishnan, Prasad Kompalli

Research Collection School Of Computing and Information Systems

Distributed software development is pervasive in the software industry today as companies vie to leverage global resources. However, popular quality and process frameworks don?t specifically address the key processes needed for managing distributed software development. This practitioner-oriented, evolutionary process maturity framework for globally distributed software development features 24 new key process areas essential for managing distributed software product development and for continuously improving product management capabilities. An assessment survey helps practitioners implement the framework. In this article, the authors detail the framework and assessment survey, as well as report their experiences implementing the framework at a leading global firm. The …

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A New Architecture For User Authentication And Key Exchange Using Password For Federated Enterprises, Yanjiang Yang, Feng Bao, Robert H. Deng May 2005

A New Architecture For User Authentication And Key Exchange Using Password For Federated Enterprises, Yanjiang Yang, Feng Bao, Robert H. Deng

Research Collection School Of Computing and Information Systems

The rapid rise of federated enterprises entails a new way of trust management by the fact that an enterprise can account for partial trust of its affiliating organizations. On the other hand, password has historically been used as a main means for user authentication because of operational simplicity. We are thus motivated to explore the use of short password for user authentication and key exchange in the context of federated enterprises. Exploiting the special structure of a federated enterprise, our proposed new architecture comprises an external server managed by each affiliating organization and a central server managed by the enterprise …

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Secure Human Communications Based On Biometrics Signals, Yongdong Wu, Feng Bao, Robert H. Deng May 2005

Secure Human Communications Based On Biometrics Signals, Yongdong Wu, Feng Bao, Robert H. Deng

Research Collection School Of Computing and Information Systems

User authentication is the first and probably the most challenging step in achieving secure person-to-person communications. Most of the existing authentication schemes require communicating parties either share a secret/password or know each other's public key. In this paper we suggest a novel user authentication scheme that is easy to use and overcomes the requirements of sharing password or public keys. Our scheme allows two human users to perform mutual authentication and have secure communications over an open channel by exchanging biometrics signals (e. g., voice or video signals). In addition to user authentication, our scheme establishes a secret session key …

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'Treaties', 'Agreements', 'Contracts' And 'Commitments' - What's In A Name? The Legal Force And Meaning Of Different Forms Of Agreement Making, David Llewelyn, Maureen Tehan May 2005

'Treaties', 'Agreements', 'Contracts' And 'Commitments' - What's In A Name? The Legal Force And Meaning Of Different Forms Of Agreement Making, David Llewelyn, Maureen Tehan

Research Collection Yong Pung How School Of Law

The multi-dimensional nature of treaty and agreement making has assumed a central focus in the conduct of relations between Indigenous peoples and settlers in Australia and elsewhere. Whether as a means of resolving disputes, delivering government programmes, or establishing common understandings, agreement making, however defined and named, has become the key tool for engagement between Indigenous and non-Indigenous Australians. Agreements come in all shapes and sizes ranging from registered Indigenous Land Use Agreements (ILUA) to Statements of Commitment, Memorandums of Understanding and Regional Agreements. In other jurisdictions these may be called 'treaties'. This paper examines the plethora of agreements in …

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It's All Right To Be Wrong, Sometimes, Seow Hon Tan May 2005

It's All Right To Be Wrong, Sometimes, Seow Hon Tan

Research Collection Yong Pung How School Of Law

Racist comments made by some youths have spawned many reactions from Singaporeans. This presents another interesting issue: Do these reactions themselves evince the kind of intolerance of a diversity of opinions which they are attacking? When and how can we differ without being intolerant and disrespectful?

Go to article

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