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Articles 8701 - 8730 of 10054
Full-Text Articles in Entire DC Network
Semi-Supervised Distance Metric Learning For Collaborative Image Retrieval, Steven Hoi, Wei Liu, Shih-Fu Chang
Semi-Supervised Distance Metric Learning For Collaborative Image Retrieval, Steven Hoi, Wei Liu, Shih-Fu Chang
Research Collection School Of Computing and Information Systems
Typical content-based image retrieval (CBIR) solutions with regular Euclidean metric usually cannot achieve satisfactory performance due to the semantic gap challenge. Hence, relevance feedback has been adopted as a promising approach to improve the search performance. In this paper, we propose a novel idea of learning with historical relevance feedback log data, and adopt a new paradigm called “Collaborative Image Retrieval” (CIR). To effectively explore the log data, we propose a novel semi-supervised distance metric learning technique, called “Laplacian Regularized Metric Learning” (LRML), for learning robust distance metrics for CIR. Different from previous methods, the proposed LRML method integrates both …
Semi-Supervised Svm Batch Mode Active Learning For Image Retrieval, Steven Hoi, Rong Jin, Jianke Zhu, Michael R. Lyu
Semi-Supervised Svm Batch Mode Active Learning For Image Retrieval, Steven Hoi, Rong Jin, Jianke Zhu, Michael R. Lyu
Research Collection School Of Computing and Information Systems
Active learning has been shown as a key technique for improving content-based image retrieval (CBIR) performance. Among various methods, support vector machine (SVM) active learning is popular for its application to relevance feedback in CBIR. However, the regular SVM active learning has two main drawbacks when used for relevance feedback. First, SVM often suffers from learning with a small number of labeled examples, which is the case in relevance feedback. Second, SVM active learning usually does not take into account the redundancy among examples, and therefore could select multiple examples in relevance feedback that are similar (or even identical) to …
Platform Competition In Digital Systems: Architectural Control And Value Migration, C. Jason Woodard
Platform Competition In Digital Systems: Architectural Control And Value Migration, C. Jason Woodard
Research Collection School Of Computing and Information Systems
Digital systems give rise to complex layered architectures in which products at one layer serve as platforms for applications and services in adjacent layers. Platform owners face a difficult balancing act. On one hand, they need to make their platforms attractive to potential complementors by mitigating the threat of architectural lock-in. On the other hand, platform owners must be careful not to give away too much too soon, or risk being unable to recoup their own investments. This paper presents an agent-based model that explores this tension at both the firm and industry levels. Computational experiments show that boundedly rational …
Operation And Technology Roadmapping Gives Singapore Smes A Strategic Edge, Knowledge@Smu
Operation And Technology Roadmapping Gives Singapore Smes A Strategic Edge, Knowledge@Smu
Knowledge@SMU
In today’s increasingly globalised, knowledge-based marketplace, a company’s ability to exploit innovation and technology is fundamental to sustaining growth and staying ahead of the competition. To help local small and medium-sized enterprises (SMEs) move up the value-chain, Singapore’s Agency for Science, Technology and Research (A*STAR) runs the Operation and Technology Roadmapping (OTR) initiative. Michael Ferrill, who cofounded the programme, spoke on OTR and knowledge transfer at the Fourth International Research Conference on Asian Business held in March 2008 at the Singapore Management University.
Smu Appoints Rajendra K. Srivastava As New Provost, Singapore Management University
Smu Appoints Rajendra K. Srivastava As New Provost, Singapore Management University
SMU Press Releases and News
No abstract provided.
A Verification System For Timed Interval Calculus, Chunqing Chen, Jin Song Dong, Jun Sun
A Verification System For Timed Interval Calculus, Chunqing Chen, Jin Song Dong, Jun Sun
Research Collection School Of Computing and Information Systems
Timed Interval Calculus (TIC) is a highly expressive set-based notation for specifying and reasoning about embedded real-time systems. However, it lacks mechanical proving support, as its verification usually involves infinite time intervals and continuous dynamics. In this paper, we develop a system based on a generic theorem prover, Prototype Verification System (PVS), to assist formal verification of TIC at a high grade of automation. TIC semantics has been constructed by the PVS typed higher-order logic. Based on the encoding, we have checked all TIC reasoning rules and discovered subtle flaws. A translator has been implemented in Java to automatically transform …
Stress Test, M. Thulasidas
Stress Test, M. Thulasidas
Research Collection School Of Computing and Information Systems
Ultimately, the risk factors that create stress in professional life do not generate any reward
Skilled And Unskilled Wages In A Globlizing World, 1968-1998, Davin Chor
Skilled And Unskilled Wages In A Globlizing World, 1968-1998, Davin Chor
Research Collection School Of Economics
This paper constructs a data set on purchasing-power-parity (PPP) adjusted skilled and unskilled wages in 139 countries for the period 1968-1998, based on the International La- bor Organization's (ILO) annual October Inquiry and the Freeman and Oostendorp (2000) Occupational Wages Around the World (OWW) le. It nds strong evidence for the ex- istence of well-integrated markets for skilled and unskilled labor, justifying the approach of constructing a skilled wage series and an unskilled wage series. Several signi cant re- sults emerged from an analysis of a representative subset of 67 countries which provided unbroken coverage for 1970-1994: (i) there is …
Architectural Control Points, C. Jason Woodard
Architectural Control Points, C. Jason Woodard
Research Collection School Of Computing and Information Systems
System designers and technology strategists have long recognized the concept of an architectural control point as a way to identify parts of a system that have particular strategic importance. Despite the vast body of work on system architecture in the engineering design literature, however, few authors have attempted to define architectural control points or study them systematically. Moreover, some industry participants have questioned whether architectural control is still a valuable or achievable goal in an era of increasingly open standards. This paper offers tentative definitions of architectural control, architectural control points, and architectural strategy. In a longer version of the …
Reaping The Rewards Of Diversity: The Role Of Identity Integration, Chi-Ying Cheng, Melissa Sanders, Jeffrey Sanchez-Burks, Kristine Molina, Fiona Lee, Emily Darling, Yu Zhao
Reaping The Rewards Of Diversity: The Role Of Identity Integration, Chi-Ying Cheng, Melissa Sanders, Jeffrey Sanchez-Burks, Kristine Molina, Fiona Lee, Emily Darling, Yu Zhao
Research Collection School of Social Sciences
How does diversity affect individuals and the groups in which they are embedded? This article examines this question using recent theory and research on Identity Integration (II). II refers to an individual's perceptions about whether two distinct social identities, or social groups to which individuals belong, are viewed as compatible (high II) or not (low II). A review of extant research suggests that individuals with high II are better at simultaneously accessing multiple identities and identity-related knowledge and have improved well-being and social outcomes. Expanding on this work, we argue that individuals who have higher II, and social collectives that …
Scalable Detection Of Semantic Clones, Mark Gabel, Lingxiao Jiang, Zhendong Su
Scalable Detection Of Semantic Clones, Mark Gabel, Lingxiao Jiang, Zhendong Su
Research Collection School Of Computing and Information Systems
Several techniques have been developed for identifying similar code fragments in programs. These similar fragments, referred to as code clones, can be used to identify redundant code, locate bugs, or gain insight into program design. Existing scalable approaches to clone detection are limited to finding program fragments that are similar only in their contiguous syntax. Other, semantics-based approaches are more resilient to differences in syntax, such as reordered statements, related statements interleaved with other unrelated statements, or the use of semantically equivalent control structures. However, none of these techniques have scaled to real world code bases. These approaches capture semantic …
A Dynamic Trust Management Scheme To Mitigate Malware Proliferation In P2p Networks, Xuhua Ding, Wei Yu, Ying Pan
A Dynamic Trust Management Scheme To Mitigate Malware Proliferation In P2p Networks, Xuhua Ding, Wei Yu, Ying Pan
Research Collection School Of Computing and Information Systems
The surge of peer-to-peer (P2P) networks consisting of thousands of of hosts makes them a breeding ground for malware proliferation. Although some existing studies have shown that malware proliferation can pose significant threats to P2P networks, defending against such an attack is largely an open problem. This paper aims to develop the countermeasure that can effectively mitigate the malware proliferation while preserving P2P networks' performance. To this end, we propose a dynamic trust management scheme based upon localized trust evaluation and alert propagation which prevents innocent peers from downloading files from infected peers. Our analysis and experimental results show that …
Reading Between The Lines, M. Thulasidas
Reading Between The Lines, M. Thulasidas
Research Collection School Of Computing and Information Systems
When it comes to news, things are seldom what they seem. The media can colour news events while remaining technically objective and strictly factual. Faced with such insidiously accurate reporting, we have little choice but to read between the lines.
A Scalable Approach To Multi-Style Architectural Modeling And Verification, Stephen Wong, Jing Sun, Ian Warren, Jun Sun
A Scalable Approach To Multi-Style Architectural Modeling And Verification, Stephen Wong, Jing Sun, Ian Warren, Jun Sun
Research Collection School Of Computing and Information Systems
Software Architecture represents the high level description of a system in terms of components, external properties and communication. Despite its importance in the software engineering process, the lack of formal description and verification support limits the value of developing architectural models. Automated formal engineering methods can provide an effective means to precisely describe and rigorously verify intended structures and behaviors of software systems. In this paper, we present an approach to support the design and verification of software architectural models using the Alloy analyzer. Based on our earlier work, we propose a fundamental library for specifying system structures in terms …
A Formal Model Of Semantic Web Service Ontology (Wsmo) Execution, Hai H. Wang, Nick Gibbins, Terry R. Payne, Ahmed Saleh, Jun Sun
A Formal Model Of Semantic Web Service Ontology (Wsmo) Execution, Hai H. Wang, Nick Gibbins, Terry R. Payne, Ahmed Saleh, Jun Sun
Research Collection School Of Computing and Information Systems
Semantic Web services have been one of the most significant research areas within the semantic Web vision, and have been recognized as a promising technology that exhibits huge commercial potential. Current semantic Web service research focuses on defining models and languages for the semantic markup of all relevant aspects of services, which are accessible through a Web service interface. The Web service modelling ontology (WSMO) is one of the most significant semantic Web service framework proposed to date. To support the standardization and tool support of WSMO, a formal semantics of the language is highly desirable. As there are a …
Gurteen-Style Knowledge Cafes: An Alternative Approach To Learning And Networking, Knowledge@Smu
Gurteen-Style Knowledge Cafes: An Alternative Approach To Learning And Networking, Knowledge@Smu
Knowledge@SMU
David Gurteen describes himself as an “independent knowledge advisor and facilitator”. He is the founder of the Gurteen Knowledge Community which functions virtually through a community website, and through Knowledge Cafes which meet regularly in different cities around the world. Gurteen visited Singapore recently and talked to Knowledge@SMU about his views on knowledge sharing, learning and networking.
Asian Research Universities: What Does The Future Hold?, Knowledge@Smu
Asian Research Universities: What Does The Future Hold?, Knowledge@Smu
Knowledge@SMU
Asian universities strive to become leading global research centres of excellence, they face a number of local and international issues and challenges. Very few will make the grade in terms of advancing knowledge, delivering outstanding graduates, and creating new technologies and industries to drive economic development in the region. At the February 2008 Singapore Management University Distinguished Presidential Lecture, Dr Suh Nam Pyo – previously at MIT for over three decades and currently president of the Korea Advanced Institute of Science and Technology (KAIST) -- outlined his own institution’s efforts to excel as a 21st century research university.
How Smes Can Leverage Innovation To Become Global Players, Knowledge@Smu
How Smes Can Leverage Innovation To Become Global Players, Knowledge@Smu
Knowledge@SMU
Small and Medium Enterprises (SMEs) need to realise that being small is only an interim stage on the way to becoming larger enterprises. How SMEs can grow is to leverage on innovation opportunities to transition to the next stage, says Singapore Management University information systems professor Desai Arcot Narasimhalu, speaking recently on “Innovation -- The tracks that can transform SMEs into global players” at the UOB-SMU Entrepreneurship Alliance Centre.
K-Sketch: A 'Kinetic' Sketch Pad For Novice Animators, Richard C. Davis, Brien Colwell, James A. Landay
K-Sketch: A 'Kinetic' Sketch Pad For Novice Animators, Richard C. Davis, Brien Colwell, James A. Landay
Research Collection School Of Computing and Information Systems
Because most animation tools are complex and timeconsuming to learn and use, most animations today are created by experts. To help novices create a wide range of animations quickly, we have developed a general-purpos informal, 2D animation sketching system called K-Sketch. Field studies investigating the needs of animatorsnd would-be animators helped us collect a library of usage scenarios for our tool. A novel optimization technique enabled us to design an interface that is simultaneously fast, simple, and powerful. The result is a pen-based system that relies on users’ intuitive sense of space and time while still supporting a wide range …
Efficient Optimistic Fair Exchange Secure In The Multi-User Setting And Chosen-Key Model Without Random Oracles, Qiong Huang, Guomin Yang, Duncan S. Wong, Willy Susilo
Efficient Optimistic Fair Exchange Secure In The Multi-User Setting And Chosen-Key Model Without Random Oracles, Qiong Huang, Guomin Yang, Duncan S. Wong, Willy Susilo
Research Collection School Of Computing and Information Systems
Optimistic fair exchange is a kind of protocols to solve the problem of fair exchange between two parties. Almost all the previous work on this topic are provably secure only in the random oracle model. In PKC 2007, Dodis et al. considered optimistic fair exchange in a multi-user setting, and showed that the security of an optimistic fair exchange in a single-user setting may no longer be secure in a multi-user setting. Besides, they also proposed one and reviewed several previous construction paradigms and showed that they are secure in the multi-user setting. However, their proofs are either in the …
Comp-Ref: A Technique To Guide The Delegation Of Responsibilities To Components In Software Systems, Subhajit Datta, Robert Van Engelen
Comp-Ref: A Technique To Guide The Delegation Of Responsibilities To Components In Software Systems, Subhajit Datta, Robert Van Engelen
Research Collection School Of Computing and Information Systems
In software systems, components collaborate to collectively fulfill requirements. A key concern of software design is the delegation of responsibilities to components such that user needs are most expediently met. This paper presents the COMP-REF technique based on a set of metrics and Linear Programming (LP) to guide the allocation of responsibilities of a system’s components. We define the metrics Aptitude Index, Requirement Set, and Concordance Index to extract some design characteristics and use these metrics in an optimization algorithm. Results from experimental validation of the COMP-REF technique across a range of software systems are reported. We also …
E-Government Implementation: A Macro Analysis Of Singapore's E-Government Initiatives, Calvin M.L. Chan, Yi Meng Lau, Shan L. Pan
E-Government Implementation: A Macro Analysis Of Singapore's E-Government Initiatives, Calvin M.L. Chan, Yi Meng Lau, Shan L. Pan
Research Collection School Of Computing and Information Systems
This paper offers a macro perspective of the various activities involved in the implementation of e-government through an interpretive analysis of the various e-government-related initiatives undertaken by the Singapore Government. The analysis lead to the identification of four main components in the implementation of e-government, namely (i) information content, (ii) ICT infrastructure, (iii) e-government infostructure, and (iv) e-government promotion. These four components were then conceptually integrated into the e-Government Implementation Framework. This paper suggests that this framework can either be used as a descriptive tool to organize and coordinate various e-government initiatives, or be used as a prescriptive structure to …
Rate-Diversity And Resource-Aware Broadcast And Multicast In Multi-Rate Wireless Mesh Networks, Bao Hua Liu, Chun Tung Chou, Archan Misra, Sanjay Jha
Rate-Diversity And Resource-Aware Broadcast And Multicast In Multi-Rate Wireless Mesh Networks, Bao Hua Liu, Chun Tung Chou, Archan Misra, Sanjay Jha
Research Collection School Of Computing and Information Systems
This paper focuses on the problem of increasing the traffic capacity (volume of admissible traffic) of broadcast and multicast flows in a wireless mesh network (WMN). We study and suggest routing strategies where the process of constructing the forwarding tree considers three distinct features: (a) the ability of individual mesh nodes to perform link-layer broadcasts at multiple rates, (b) the wireless broadcast advantage, whereby a single broadcast transmission covers multiple neighboring receivers and (c) the residual transmission capacity at a WMN node, subject to intereference-based constraints from existing traffic flows in its neighborhood. Our metric of interest is the total …
Building A Web Of Trust Without Explicit Trust Ratings, Young Ae Kim, Minh-Tam Le, Hady W. Lauw, Ee Peng Lim, Haifeng Liu, Jaideep Srivastava
Building A Web Of Trust Without Explicit Trust Ratings, Young Ae Kim, Minh-Tam Le, Hady W. Lauw, Ee Peng Lim, Haifeng Liu, Jaideep Srivastava
Research Collection School Of Computing and Information Systems
A satisfactory and robust trust model is gaining importance in addressing information overload, and helping users collect reliable information in online communities. Current research on trust prediction strongly relies on a web of trust, which is directly collected from users based on previous experience. However, the web of trust is not always available in online communities and even though it is available, it is often too sparse to predict the trust value between two unacquainted people with high accuracy. In this paper, we propose a framework to derive degree of trust based on users' expertise and users' affinity for certain …
Validating Multi-Column Schema Matchings By Type, Bing Tian Dai, Nick Koudas, Divesh Srivastava, Anthony K.H. Tung, Suresh Venkatasubramanian
Validating Multi-Column Schema Matchings By Type, Bing Tian Dai, Nick Koudas, Divesh Srivastava, Anthony K.H. Tung, Suresh Venkatasubramanian
Research Collection School Of Computing and Information Systems
Validation of multi-column schema matchings is essential for successful database integration. This task is especially difficult when the databases to be integrated contain little overlapping data, as is often the case in practice (e.g., customer bases of different companies). Based on the intuition that values present in different columns related by a schema matching will have similar "semantic type", and that this can be captured using distributions over values ("statistical types"), we develop a method for validating 1-1 and compositional schema matchings. Our technique is based on three key technical ideas. First, we propose a generic measure for comparing two …
Measurement And Estimation Of Network Qos Among Peer Xbox 360 Game Players, Youngki Lee, Sharad Agarwal, Chris Butcher, Jitu Padhye
Measurement And Estimation Of Network Qos Among Peer Xbox 360 Game Players, Youngki Lee, Sharad Agarwal, Chris Butcher, Jitu Padhye
Research Collection School Of Computing and Information Systems
The research community has proposed several techniques for estimating the quality of network paths in terms of delay and capacity. However, few techniques have been studied in the context of large deployed applications. Network gaming is an application that is extremely sensitive to network path quality [1,2,3]. Yet, the quality of network paths among players of large, wide-area games and techniques for estimating it have not received much attention from the research community.
Can Leadership Development Be Taught? Not Really, Says Banyan Treechairman Ho Kwon Ping, Knowledge@Smu
Can Leadership Development Be Taught? Not Really, Says Banyan Treechairman Ho Kwon Ping, Knowledge@Smu
Knowledge@SMU
Formal education may be a good vehicle for imparting specialised knowledge or domain expertise. What it does less well is to teach leadership development, hence the moral vacuum sometimes evident at the upper levels of society from business to politics. This dilemma was the focus of a recent talk by Banyan Tree Holding’s executive chairman, Ho Kwon Ping, as part of the CEO Talks series organised by the Wee Kim Wee Centre of Singapore Management University (SMU). Ho, who is also chairman of SMU’s Board of Trustees, won the CEO of the Year 2007 award in Singapore.
Motorola Cio Patricia Morrison In Dialogue: How Technology Drives Value Creation For Business, Knowledge@Smu
Motorola Cio Patricia Morrison In Dialogue: How Technology Drives Value Creation For Business, Knowledge@Smu
Knowledge@SMU
Global communications technology giant Motorola has 65,000 employees in 140 countries. Patricia Morrison, the company’s executive vice president (EVP) and chief information officer (CIO) shared insights about her role as CIO and how technology drives value creation for business at a recent Business IT Talk organised by the School of Information Systems, Singapore Management University. Morrison, who joined the company in 2005 with over 20 years of experience in managing IT and systems, was selected 2007 CIO of the Year by the Executives Club of Chicago and the Association of Information Technology Professionals.
Speaking Out: The Responsibilities Of Management Intellectuals: A Survey, Stephen Dunne, Stefano Harney, Martin Parker
Speaking Out: The Responsibilities Of Management Intellectuals: A Survey, Stephen Dunne, Stefano Harney, Martin Parker
Research Collection Lee Kong Chian School Of Business
This article discusses our analysis of over 2,000 articles publishedwithin 20 top business and management journals. The article empirically demonstrates how little attention is being paid by the work published within these journals to contemporary political issues across the globe. We also demonstrate the extent to which the same is true of ‘critical’ journals such as Organization. To this end we argue that mass scholarly ranking mechanisms, such as the British Research Assessment Exercise (RAE),create a general state of myopia on the part of business and management scholars towards a variety of political issues, even making a virtue out of …
Quanttalent Management, M. Thulasidas
Quanttalent Management, M. Thulasidas
Research Collection School Of Computing and Information Systems
Since structured products are a major profit engine on the trading floor of most banks, this demand represents a strong pull factor for quants from competing institutions. There is nothing much that most financial institutions can do about this pull factor, except to pull them back in with offers they can’t refuse.