Digital Commons Network^™

Mastaq: A Middleware Architecture For Sensor Applications With Statistical Quality Constraints, Inseok Hwang, Qi Han, Archan Misra

Research Collection School Of Computing and Information Systems

We present the design goals and functional components of MASTAQ, a data management middleware for pervasive applications that utilize sensor data. MASTAQ allows applications to specify their quality-of information (QoI) preferences (in terms of statistical metrics over the data) independent of the underlying network topology. It then achieves energy efficiency by adaptively activating and querying only the subset of sensor nodes needed to meet the target QoI bounds. We also present a closed-loop feedback mechanism based on broadcasting of activation probabilities, which allows MASTAQ to activate the appropriate number of sensors without requiring any inter-sensor coordination or knowledge of the …

Fingerprinting Relational Databases: Schemes And Specialities, Yingjiu Li, Vipin Swarup, Sushil Jajodia

Research Collection School Of Computing and Information Systems

In this paper, we present a technique for fingerprinting relational data by extending Agrawal et al.'s watermarking scheme. The primary new capability provided by our scheme is that, under reasonable assumptions, it can embed and detect arbitrary bit-string marks in relations. This capability, which is not provided by prior techniques, permits our scheme to be used as a fingerprinting scheme. We then present quantitative models of the robustness properties of our scheme. These models demonstrate that fingerprints embedded by our scheme are detectable and robust against a wide variety of attacks including collusion attacks.

Evaluation Of Mpeg-4 Ipmp Extension, Hwee Hwa Pang, Yongdong Wu

Research Collection School Of Computing and Information Systems

MPEG-4 IPMPX (intellectual property management and protection extension) is the latest ISO standard which provides a flexible framework for protecting MPEG streams. The message mechanism of IPMPX enables interoperability among IPMPX-compliant devices no matter which protection methods are embedded. This paper highlights several problems in the message syntax of IPMPX: the tool delivery message IPMP_ToolES_AU is vulnerable to network attack, the authentication message IMP_Mutual_Authentication is incapable of defending against forgery attack, and the configuration message IPMP_SelectiveDecrptionInit is ambiguous and redundant. We propose a number of remedies to those problems, which can be incorporated into a corrigenda to improve the present …

Bougainville Community Crime Trends: A Survey Of Crime In Arawa And Buka, Mark Findlay, Gerard Guthrie, Fiona Hukula, James Laki

Research Collection Yong Pung How School Of Law

The fundamental difference in the role of the state in the recent histories of Arawa and Buka is critical to understanding community attitudes to crime and policing. In Arawa, the state was entirely absent for over 10 years during the civil war and community-based agencies provided the sole source of authority and social control. In Buka, the state remained in control in difficult circumstances. The peace process was based around indigenous dispute resolution techniques and now a role for the state is being gradually reintroduced into post-conflict Bougainville, including of policing services to Arawa. The differences in the recent histories …

Older Workers: Untapped Assets For Creating Value, Knowledge@Smu

Knowledge@SMU

The days when an executive could look forward to a leisurely retirement out on the golf course are over, thanks to a possible looming job shortage, a graying population, low savings rates and an insecure Social Security system. The impact of these factors on both workers and companies was the subject of the Symposium on Older Workers, co-sponsored recently by the AARP Global Aging Program along with Wharton's Center for Human Resources and Boettner Center for Pensions and Retirement Research. Speakers included AARP CEO William D. Novelli, Olivia Mitchell, executive director of Wharton's Pension Research Council, and Thomas Dowd, a …

Video Summarization And Scene Detection By Graph Modeling, Chong-Wah Ngo, Yu-Fei Ma, Hong-Jiang Zhang

Research Collection School Of Computing and Information Systems

In this paper, we propose a unified approach for video summarization based on the analysis of video structures and video highlights. Two major components in our approach are scene modeling and highlight detection. Scene modeling is achieved by normalized cut algorithm and temporal graph analysis, while highlight detection is accomplished by motion attention modeling. In our proposed approach, a video is represented as a complete undirected graph and the normalized cut algorithm is carried out to globally and optimally partition the graph into video clusters. The resulting clusters form a directed temporal graph and a shortest path algorithm is proposed …

The Value Of Mobile Applications: A Utility Company Study, Fiona Fui-Hoon Nah, Keng Siau, Hong Sheng

Research Collection School Of Computing and Information Systems

The value proposition of mobile applications i.e. the net value of the benefits and costs associated with the adoption and adaptation of mobile applications is discussed. A means-ends network that depicts the fundamental relationships among the objectives such as efficiency, effectiveness, customer satisfaction, security, cost, and employee acceptance, was developed. The network is useful to researchers as it highlights the issues, concerns, and values of mobile applications. The network help the managers and practitioners to achieve their companies' objectives of implementing mobile and wireless applications.

Introduction: China, Ltd, William A. Callahan

Research Collection School of Social Sciences

The study of Chinese nationalism is very popular--both in China and the West. This article introduces a special section of seven articles (four of which are in this issue) on 'The Limits of Chinese Nationalism', arguing that our understanding of nationalism in China is problematic. This special section aims to explore the limits of many of the statements about Chinese nationalism that have now become 'common sense': the rise of Chinese nationalism, nationalism filling an ideological vacuum, elites manipulating nationalism to gain legitimacy, and so on. Using critical IR theory this Introduction explores the concept of limits to argue that …

Transient Response Of Arrow Vcsels, Chyng Wen Tee, S. F. Yu, R. V. Penty, I. H. White

Research Collection Lee Kong Chian School Of Business

The transient response of antiresonant reflecting optical waveguide (ARROW) vertical-cavity surface-emitting lasers (VCSELs) is analyzed. It is found that under current modulation, the radiation loss of the transverse-leaky mode decreases during the state of the lasers but increases during the state. Numerical analysis shows that this variation in radiation loss is due to the carrier-induced refractive-index depression that arises from spatial-hole-burning of carrier concentration. It is noted that the increment in radiation loss during the state can be used to prevent net modal gain of the transverse-leaky mode from reacquiring threshold after turn-off. Hence, a new method to design ARROW, …

Managing Learning Resources For Consecutive Product Generations, Lieven Demeester, Mei Qi

Research Collection Lee Kong Chian School Of Business

In this paper, we study how a firm should allocate its learning resources when it is concurrently producing two consecutive generations of one product. We define learning resources as scarce firm-specific resources that a firm allocates towards the improvement of the cost, quality or timeliness of its existing products and processes. We use empirically tested models for demand substitution and learning curves to formulate this problem, and we present our results as propositions with regard to the optimal time at which a firm should direct all its learning resources to the newer product generation, depending on the substitution rate of …

Questioning Proximity: East Asian Tv Dramas In Indonesia, Charlotte Setijadi

Research Collection School of Social Sciences

The study of transnational cultural flows has been of continuing interest among media and communication researchers, with recent studies focusing on cultural flows within geographically and culturally adjacent nations. It is often suggested that the level of “cultural proximity” that exists determines the success of cultural exchange between countries regarded to possess similar cultural traits. This notion, that local audiences will have preference for cultural commodities from countries with which they share cultural ties in recognition of their own culture, has enjoyed much intellectual currency in recent times, especially in relation to analyses of regional media markets. The danger of …

Singapore Management University Report To Stakeholders 2005 - 2006, Singapore Management University

Report to Stakeholders

With the official opening of the city campus in January 2006, SMU marked a new chapter in the history of central Singapore and became an integral part of the area s continual cycle of renewal. Building on the legacy of venerable institutions in Bras Basah that formed the educational hub of yesteryear, our aim is to produce visionary leaders for tomorrow, imbued with a fine sense of ethics and social responsibility for the good of the community.

From its beginning, SMU has been a catalyst for the future development of higher education in Singapore. Two ways that we have done …

Intellectual Capital Performance And Cash-Based Incentive Payments: Impact Of Remuneration Committee And Corporate Governance Features, Jean-Luc Wolfgang Mitchell Van Der Zahn, Inderpal Singh, Alistair Brown

Research Collection School Of Accountancy

No abstract provided.

Linear Correlation Discovery In Databases: A Data Mining Approach, Cecil Chua, Roger Hsiang-Li Chiang, Ee Peng Lim

Research Collection School Of Computing and Information Systems

Very little research in knowledge discovery has studied how to incorporate statistical methods to automate linear correlation discovery (LCD). We present an automatic LCD methodology that adopts statistical measurement functions to discover correlations from databases’ attributes. Our methodology automatically pairs attribute groups having potential linear correlations, measures the linear correlation of each pair of attribute groups, and confirms the discovered correlation. The methodology is evaluated in two sets of experiments. The results demonstrate the methodology’s ability to facilitate linear correlation discovery for databases with a large amount of data.

Special Section: Human-Computer Interaction Research In Management Information Systems, Ping Zhang, Fiona Fui-Hoon Nah, Izak Benbasat

Research Collection School Of Computing and Information Systems

No abstract provided.

Partnering For Perfection: An Economics Perspective On B2b Electronic Market Strategic Alliances, Qizhi Dai, Robert J. Kauffman

Research Collection School Of Computing and Information Systems

New technological innovations have made it possible for new intermediaries to create value in business processes that involve the procurement of manufacturing and services supplies. Associated with these innovations is the emergence of business-to-business (B2B) electronic markets. These act as digital intermediaries that aim to reduce the transaction costs and mitigate the risks inherent in procurement. They improve buyers’ capabilities to search for attractive prices and also serve to increase the liquidity of sellers’ products. In this chapter, the authors explore the evolution of B2B e-market firms in terms of the strategies they employ to “perfect” their value propositions and …

Ontology-Assisted Mining Of Rdf Documents, Tao Jiang, Ah-Hwee Tan

Research Collection School Of Computing and Information Systems

Resource description framework (RDF) is becoming a popular encoding language for describing and interchanging metadata of web resources. In this paper, we propose an Apriori-based algorithm for mining association rules (AR) from RDF documents. We treat relations (RDF statements) as items in traditional AR mining to mine associations among relations. The algorithm further makes use of a domain ontology to provide generalization of relations. To obtain compact rule sets, we present a generalized pruning method for removing uninteresting rules. We illustrate a potential usage of AR mining on RDF documents for detecting patterns of terrorist activities. Experiments conducted based on …

Technology Competition And Optimal Investment Timing: A Real Options Perspective, Robert J. Kauffman, X. Li

Research Collection School Of Computing and Information Systems

Companies often choose to defer irreversible investments to maintain valuable managerial flexibility in an uncertain world. For some technology-intensive projects, technology uncertainty plays a dominant role in affecting investment timing. This article analyzes the investment timing strategy for a firm that is deciding about whether to adopt one or the other of two incompatible and competing technologies.We develop a continuous-time stochastic model that aids in the determination of optimal timing for managerial adoption within the framework of real options theory. The model captures the elements of the decision-making process in such a way so as to provide managerial guidance in …

The Effects Of Shilling On Final Bid Prices In Online Auctions, Robert J. Kauffman, Charles A. Wood

Research Collection School Of Computing and Information Systems

An increasing number of reports of online auction fraud are of growing concern to auction operators and participants. In this research, we discuss reserve price shilling, where a bidder shills in order to avoid paying auction house fees, rather than to drive up the price of the final bid. We examine the effect that premium bids have upon the final selling price, since they are linked with reserve price shill bids. We use 10,260 eBay auctions during April 2001, and identify 919 auctions involving 322 sellers and 1583 bidders involved in concurrent auctions for the exact same item. We find …

Religious Processions: Urban Politics And Poetics, Lily Kong

Research Collection School of Social Sciences

In this paper, I will explore the ways in which processions, by their very visibility, foreground the relationships between the secular and the sacred, while contributing to a construction of identity and community, and simultaneously surfacing fractures therein. Using the example of multireligious yet secular Singapore, I will examine (a) the state's management of religious processions, including the regulation of time and space for such events, as well as regulations over noise production; (b) the tactics of adaptation, negotiation and resistance that participants engage in at an everyday level in response to the state's ideologies, policies, laws and strategies; (c) …

Education, Technological Progress And Economic Growth, Winston T. H. Koh, Hing-Man Leung

Research Collection School Of Economics

An important role of education – and the resultant accumulation of human capital – for a less-developed economy is to facilitate technology diffusion in order for it to catch up with developed economies. This paper presents a model linking education, the accumulation of physical capital and technological progress. In the model, investment in education and the accumulation of physical capital are complementary, and intertwine with the technology progress through related effects on technology diffusion and the expansion of the technology frontier. The allocation of effort to education, the optimal savings rate and the technology gap are endogenously determined in the …

An Analytical Framework Of Science Parks And Technology Districts With An Application To Singapore, Francis Koh, Winston T. H. Koh, Ted Feichin Tschang

Research Collection School Of Economics

This paper analyzes the question: What does it take for science parks and technology districts to evolve and grow? We propose an analytical framework to examine the gestation, evolution, and sustainability of science parks and related but broader regional phenomena such as technology districts. The framework comprises three aspects of a science park's development: growth mechanisms, level of technological capabilities, and nature of its integration with national or global markets. The main growth mechanisms we identify are government-led infrastructure provision, agglomeration effects, and continual self-renewal through the creation of new businesses. We apply this framework to analyze Singapore's science park …

The Contractual Basis Of The Enforcement Of Exclusive And Non-Exclusive Choice Of Court Agreements, Tiong Min Yeo

Research Collection Yong Pung How School Of Law

This article argues that, although choice of court agreements can be viewed from a procedural or contractual perspective, the predominant approach in Singapore and English law in respect of the exclusive jurisdiction agreement has been to give primacy to the rationale of the enforcement of a contractual bargain, tempered by a judicial discretion in its enforcement within the procedural jurisdictional context. It is also argued that the only difference between exclusive and non-exclusive jurisdiction agreements lies in the content and scope of the agreement between the parties, so the same contractual approach (as tempered by procedural considerations) should be applied …

Contract Formation And Mistake In Cyberspace – The Singapore Experience, Andrew B.L. Phang

Research Collection Yong Pung How School Of Law

The present article analyses the many important issues that are raised by what is probably the first case on Internet mistake – the Singapore High Court decision of Chwee Kin Keong v Digilandmall.com Pte Ltd [2004] 2 SLR 594. In addition to the law of (especially, unilateral) mistake, issues relating to the formation of a contract will be considered (including the law relating to offer and acceptance with regard to both website advertisements as well as electronic mail transactions, and the weakness of (and, hence, need to reform) the doctrine of consideration).

Applying Scenario-Based Design And Claim Analysis To The Design Of A Digital Library Of Geography Examination Resources, Yin-Leng Theng, Dion Hoe-Lian Goh, Ee Peng Lim, Zehua Liu, Ming Yin, Natalie Lee-San Pang, Patricia Bao-Bao Wong

Research Collection School Of Computing and Information Systems

This paper describes the application of Carroll’s scenario-based design and claims analysis as a means of refinement to the initial design of a digital library of geographical resources (GeogDL) to prepare Singapore students to take a national examination in geography. GeogDL is built on top of G-Portal, a digital library providing services over geospatial and georeferenced Web content. Beyond improving the initial design of GeogDL, a main contribution of the paper is making explicit the use of Carroll’s strong theory-based but undercapitalized scenario-based design and claims analysis that inspired recommendations for the refinement of GeogDL. The paper concludes with an …

A Multi-Agent Approach For Solving Optimization Problems Involving Expensive Resources, Hoong Chuin Lau, H. Wang

Research Collection School Of Computing and Information Systems

In this paper, we propose a multi-agent approach for solving a class of optimization problems involving expensive resources, where monolithic local search schemes perform miserably. More specifically, we study the class of bin-packing problems. Under our proposed Fine-Grained Agent System scheme, rational agents work both collaboratively and selfishly based on local search and mimic physics-motivated systems. We apply our approach to a generalization of bin-packing - the Inventory Routing Problem with Time Windows - which is an important logistics problem, and demonstrate the efficiency and effectiveness of our approach.

Is The Contractor More Secure With A Priority Right? A Functional Analysis Of Article 286 Of Prc Contract Law, Wei Zhang

Research Collection Yong Pung How School Of Law

In recent years, China’s economic boom has drawn considerable attention all around the world. Real estate development is among the strongest pillars that support the fast growing GDP of this country. When fascinated by the shining residential buildings, office towers and public facilities sprouting across the country, however, we are also surprised at the mountains of the outstanding debts that Chinese contractors are not able to collect. Statistics shows that the aggregate amount of overdue payment to contractors has increased steadily during the past 15 years nationwide, with about $440 million in 1990, $2.4 billion in 1992, $3.7 billion in …

Analysis And Insights From A Dynamical Model Of Nuclear Plant Safety Risk, Stephen Hess, Alfonso M. Albano, John Gaertner

Research Collection School of Social Sciences

In this paper, we expand upon previously reported results of a dynamical systems model for the impact of plant processes and programmatic performance on nuclear plant safety risk. We utilize both analytical techniques and numerical simulations typical of the analysis of nonlinear dynamical systems to obtain insights important for effective risk management. This includes use of bifurcation diagrams to show that period doubling bifurcations and regions of chaotic dynamics can occur. We also investigate the impact of risk mitigating functions (equipment reliability and loss prevention) on plant safety risk and demonstrate that these functions are capable of improving risk to …

Do Rural Land Markets Increase Inequality? Evidence From A Chinese Province, Qian Forrest Zhang

Research Collection School of Social Sciences

Using a 2001 provincial survey, we find that disparities in land-rights distribution have greatly increased in rural China, and the growth of land markets is directly responsible for that. The land markets tend to concentrate land in those who can more efficiently use it. This translates disparities in land-rights distribution to magnified inequality in farm income. However, such widening disparities caused by land markets have compensatory effects on overall rural inequality, as land markets tend to bring up families who would fall at the bottom of income distribution in the absence of such markets. Expansion of markets, in this case, …

Defining (Multiple) Selves: Stories From The Field, Chang Yau Hoon

Research Collection School of Social Sciences

The ‘Self’ in late-modernity is never singular but multiplies across different discourses, practices and positions. It is constructed through difference. It is only through a relation to the ‘Other’ that the ‘Self’ can be defined. This paper endeavours to map the endless negotiations of my ‘Self’ as male Australian academic of Chinese descent, a Malaysian citizen, a Bruneian resident, and an Indonesian specialist, over a period of fieldwork in Jakarta in 2004. It discusses how I defined my multiple ‘Selves’ to different individuals and communities, how they in turn defined me, and how these constructions were always shifting. Depending on …