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Infosemm: Infosys It Security Maturity Model: A Report, Arcot Desai Narasimhalu, N. Dayasindhu, Raghavan Subramanian Jul 2004

Infosemm: Infosys It Security Maturity Model: A Report, Arcot Desai Narasimhalu, N. Dayasindhu, Raghavan Subramanian

Research Collection School Of Computing and Information Systems

Businesses are faced with a continuing battle related to cyber security related issues ranging from cyber attacks all the way to cyber (information) war. These issues affect result in information, system, reputation, and revenue related risks. These risks arise because of vulnerabilities introduced in three major parts of the enterprise – infrastructure, intelligence and practices. This report provides a rating system for representing the security health of enterprises.

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An Empirical Investigation On End-Users’ Acceptance Of Enterprise Systems, Fiona Fui-Hoon Nah, Xin Tan, Soon Hing Teh Jul 2004

An Empirical Investigation On End-Users’ Acceptance Of Enterprise Systems, Fiona Fui-Hoon Nah, Xin Tan, Soon Hing Teh

Research Collection School Of Computing and Information Systems

Despite the huge investments by organizations in ERP implementation, maintenance, and user training, ERP implementation failures and less-than-satisfactory productivity improvements are common. End-users’ reluctance or unwillingness to adopt or use the newly implemented ERP system is often cited as one of the main reasons for ERP failures. To examine factors leading to the lack of end-user acceptance of ERP systems, we reviewed the literature on user adoption of IT in mandatory contexts, developed hypotheses to explain ERP user acceptance, and conducted a survey study to test the hypotheses. In particular, we examined end-users’ attitudes toward system use and symbolic adoption, …

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Taking Dcop To The Real World: Efficient Complete Solutions For Distributed Event Scheduling, Rajiv Maheswaran, Milind Tambe, Emma Bowring, Jonathan Pearce, Pradeep Varakantham Jul 2004

Taking Dcop To The Real World: Efficient Complete Solutions For Distributed Event Scheduling, Rajiv Maheswaran, Milind Tambe, Emma Bowring, Jonathan Pearce, Pradeep Varakantham

Research Collection School Of Computing and Information Systems

Distributed Constraint Optimization (DCOP) is an elegant formalism relevant to many areas in multiagent systems, yet complete algorithms have not been pursued for real world applications due to perceived complexity. To capably capture a rich class of complex problem domains, we introduce the Distributed Multi-Event Scheduling (DiMES) framework and design congruent DCOP formulations with binary constraints which are proven to yield the optimal solution. To approach real-world efficiency requirements, we obtain immense speedups by improving communication structure and precomputing best case bounds. Heuristics for generating better communication structures and calculating bound in a distributed manner are provided and tested on …

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Notes On Equilibria In Symmetric Games, Shih-Fen Cheng, Daniel M. Reeves, Yevgeniy Vorobeychik, Michael P. Wellman Jul 2004

Notes On Equilibria In Symmetric Games, Shih-Fen Cheng, Daniel M. Reeves, Yevgeniy Vorobeychik, Michael P. Wellman

Research Collection School Of Computing and Information Systems

In a symmetric game, every player is identical with respect to the game rules. We show that a symmetric 2strategy game must have a pure-strategy Nash equilibrium. We also discuss Nash’s original paper and its generalized notion of symmetry in games. As a special case of Nash’s theorem, any finite symmetric game has a symmetric Nash equilibrium. Furthermore, symmetric infinite games with compact, convex strategy spaces and continuous, quasiconcave utility functions have symmetric pure-strategy Nash equilibria. Finally, we discuss how to exploit symmetry for more efficient methods of finding Nash equilibria.

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An Interactive Learning Environment For A Dynamic Educational Digital Library, Ee Peng Lim, Dion Hoe-Lian Goh, Yin-Leng Theng, Eng-Kai Suen Jul 2004

An Interactive Learning Environment For A Dynamic Educational Digital Library, Ee Peng Lim, Dion Hoe-Lian Goh, Yin-Leng Theng, Eng-Kai Suen

Research Collection School Of Computing and Information Systems

GeogDL is a digital library of geography examination resources designed to assist students in preparing for a national geography examination in Singapore. We describe an interactive learning environment built into GeogDL that consists of four major components. The practice and review module allows students to attempt individual examination questions, the mock exam provides a simulation of the actual geography examination, the trends analysis tool provides an overview of the types of questions asked in previous examinations, while the contributions module allows students and teachers to create and share knowledge within the digital library.

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Embedded Co-Operation In The Context Of Singapore's Investment Enclaves In Indonesia And Vietnam: A Strategy Reconsidered, Caroline Yeoh, Siang Yeung Wong Jul 2004

Embedded Co-Operation In The Context Of Singapore's Investment Enclaves In Indonesia And Vietnam: A Strategy Reconsidered, Caroline Yeoh, Siang Yeung Wong

Research Collection Lee Kong Chian School Of Business

Regional industrial development projects - development packages assembled, administered and promoted by consortia of sovereign national governments - are new players in the global competition for foreign investments. Singapore's flagship projects in China have received much attention. Our paper reports on Singapore's lesser-known projects in Indonesia and Vietnam. The strategic intent of these transborder industrialization initiatives is to set in place a configuration for the city-state to restructure its domestic industries, and yet retain important linkages with production centers in low-cost environments. The effectiveness of this stratagem is evaluated from the perspectives of the tenant firms, as well as from …

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Singapore's Regionalization Blueprint: The Empirics Of The Case For Selective Intervention, Caroline Yeoh, Siang Yeung Wong Jul 2004

Singapore's Regionalization Blueprint: The Empirics Of The Case For Selective Intervention, Caroline Yeoh, Siang Yeung Wong

Research Collection Lee Kong Chian School Of Business

No abstract provided.

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The Relationship Among Export Assistance, Pricing Strategy Adaptation To The Foreign Market, And Performance Improvement, Luis Filipe Lages, David B. Montgomery Jul 2004

The Relationship Among Export Assistance, Pricing Strategy Adaptation To The Foreign Market, And Performance Improvement, Luis Filipe Lages, David B. Montgomery

Research Collection Lee Kong Chian School Of Business

The increasing amount of export assistance provided to firms of rich and poor countries shows the high priority given by national and international policy makers to the encouragement of international trade. Despite this, relatively few international marketing researchers have discussed the effectiveness of such export assistance. This exploratory study provides an empirical foundation for simultaneously analyzing the effects of export assistance on the decision to adapt or standardize the domestic pricing strategy to the main foreign market and ultimately improve a firm’s short-term export performance. Surprisingly, the findings reveal that the total effects of export assistance on short-term export performance …

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A Rate-Distortion Framework For Information-Theoretic Mobility Management, Abhishek Roy, Archan Misra, Sajal K. Das Jun 2004

A Rate-Distortion Framework For Information-Theoretic Mobility Management, Abhishek Roy, Archan Misra, Sajal K. Das

Research Collection School Of Computing and Information Systems

A practical information theoretic framework is developed for studying the optimal tradeoff between location update and paging costs in cellular networks. The framework envisions the quantization of location information into a registration area (RA) level granularity, followed by the use of an entropy-coding technique to decrease the location update rate. The rate distortion theory of the lossy quantization is identified as an appropriate measure for capturing the optimal tradeoff between a mobile's update rate and its location uncertainty. Based on LZ-78 compression, two different RA-level location update algorithms (RA-LeZi and LeZi-RA) have been developed, both of which asymptotically approach this …

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The Complexity Of Uml: Differentiating Practical And Theoretical Complexity, J. Erickson, Keng Siau Jun 2004

The Complexity Of Uml: Differentiating Practical And Theoretical Complexity, J. Erickson, Keng Siau

Research Collection School Of Computing and Information Systems

UML (Unified Modeling Language) has been criticized for its complexity, relating to users, and those learning to use it. Using Rossi and Brinkkemper’s [9] complexity metrics, Siau and Cao [10] completed a complexity analysis of UML and 36 other modeling techniques, finding that UML is indeed more complex than other techniques. Siau, Erickson and Lee [11] argued that Rossi and Brinkkemper’s metrics present the theoretical maximum complexity, as opposed to a practitioner-based complexity, that must be less than the theoretical maximum. The current research proposes that a subset of UML (a kernel) composed of the most commonly used constructs, would …

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Furthering The Understanding Of Practical Complexity: Identifying A Kernel Of Uml, J. Erickson, Keng Siau Jun 2004

Furthering The Understanding Of Practical Complexity: Identifying A Kernel Of Uml, J. Erickson, Keng Siau

Research Collection School Of Computing and Information Systems

The Unified Modeling Language (UML) was adopted by the Object Management Group as the standard visual modeling language for OO systems development. However, UML has been criticized in the literature for its complexity, inconsistent semantics, and ambiguous constructs. A set of complexity indices for UML in aggregate, and the nine diagramming techniques individually, was compiled recently. Since this set of metrics is based on inclusion of all possible constructs in UML, it thus provides an indication of the theoretical (maximum) complexity of the modeling methods. This paper contends that in practice, developers do not use all of the possible diagrams …

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Steganographic Schemes For File System And B-Tree, Hwee Hwa Pang, Kian-Lee Tan, Xuan Zhou Jun 2004

Steganographic Schemes For File System And B-Tree, Hwee Hwa Pang, Kian-Lee Tan, Xuan Zhou

Research Collection School Of Computing and Information Systems

While user access control and encryption can protect valuable data from passive observers, these techniques leave visible ciphertexts that are likely to alert an active adversary to the existence of the data. We introduce StegFD, a steganographic file driver that securely hides user-selected files in a file system so that, without the corresponding access keys, an attacker would not be able to deduce their existence. Unlike other steganographic schemes proposed previously, our construction satisfies the prerequisites of a practical file system in ensuring the integrity of the files and maintaining efficient space utilization. We also propose two schemes for implementing …

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Integrating Business Opportunities In An Emerging Asian Economy: Perspectives From Singapore's Gambit In Vietnam, Ai Lin Leong, David David, Caroline Yeoh Jun 2004

Integrating Business Opportunities In An Emerging Asian Economy: Perspectives From Singapore's Gambit In Vietnam, Ai Lin Leong, David David, Caroline Yeoh

Research Collection Lee Kong Chian School Of Business

To date, Singapore’s regionalization strategy has been applied in China, India, Indonesia and Vietnam through the establishment of industrial parks. The nexus between these ‘clones’ is the implantation of Singapore’s positive business ethos amidst more uncertain host environments. Leveraging on world-class infrastructure, efficiency and location-specific advantages, these industrial parks present themselves as low-cost investment enclaves. This paper focuses on the regional industrial development project assembled, administered and promoted by the sovereign national governments of Singapore and Vietnam. Using in-depth case studies, it examines the push-pull factors for firms with different structures. It finds that progress in this privileged foreign investment …

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Intelligence Strategy: The Evolution And Co-Evolution Dynamics Of Intelligent Human Organizations And Their Interacting Agents, Thow Yick Liang Jun 2004

Intelligence Strategy: The Evolution And Co-Evolution Dynamics Of Intelligent Human Organizations And Their Interacting Agents, Thow Yick Liang

Research Collection Lee Kong Chian School Of Business

In the knowledge economy, the human minds are the most vital center of analysis. They are the complex adaptive systems capable of processing information, establishing knowledge structure, conceptualizing idea, and making decision. The intrinsic intelligence of the individual minds, as well as the organizational/ collective intelligence, drives the dynamic of all human systems. Primarily, the local self-enrichment processes of the interacting agents are autopoietic. In addition, global forces are also present in all human organizations. The global forces are constructive only if they support the elementary processes. The global forces originate from the orgmind of the organization. A complex relationship …

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Comparison Of Discrete Singular Convolution And Generalised Differential Quadrature For The Vibration Analysis Of Rectangular Plates, C. H. W. Ng, Yibao Zhao, G. W. Wei Jun 2004

Comparison Of Discrete Singular Convolution And Generalised Differential Quadrature For The Vibration Analysis Of Rectangular Plates, C. H. W. Ng, Yibao Zhao, G. W. Wei

Research Collection Lee Kong Chian School Of Business

This paper presents a comprehensive comparison study between the discrete singular convolution (DSC) and the well-known global method of generalized differential quadrature (GDQ) for vibration analysis so as to enhance the understanding of the DSC algorithm. The DSC method is implemented through Lagrange's delta sequence kernel (DSC-LK), which utilizes local Lagrange polynomials to calculate weighting coefficients, whereas, the GDQ requires global ones. Moreover, it is shown that the treatments of boundary conditions and the use of grid systems are different in the two methods. Comparison study is carried out on 21 rectangular plates of different combinations of simply supported (S), …

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The Singapore "Advantage" In India: A Perception Or A Premium?, Alexandra Si-Lan Wee, Ai Lin Leong, Caroline Yeoh Jun 2004

The Singapore "Advantage" In India: A Perception Or A Premium?, Alexandra Si-Lan Wee, Ai Lin Leong, Caroline Yeoh

Research Collection Lee Kong Chian School Of Business

Singapore’s regionalisation strategy has been applied in various countries, such as China, Vietnam and India, through the establishment of industrial parks. The parks are marketed as a winning combination of the host country’s unique location advantages and Singapore style efficiency and management know-how. Singapore’s foray into India was marked by the setting up of the ITPL in Bangalore, and furthered by its venture into a future phase of HITEC City, based on her success in Bangalore. However, with global businesses shifting interests towards India, and competing industrial parks emerging to meet the increasing demand, ITPL is faced with stiff competition …

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Extending Economic Space: Some Empirics On Singapore's Gambit In Bangalore And Hyderabad, India, Kevin Wongso, Caroline Yeoh, Lu Gao Jun 2004

Extending Economic Space: Some Empirics On Singapore's Gambit In Bangalore And Hyderabad, India, Kevin Wongso, Caroline Yeoh, Lu Gao

Research Collection Lee Kong Chian School Of Business

No abstract provided.

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Integrating Product Platform Development With Supply Chain Configuration In A Global Environment, Soumen Ghosh, Nagesh Murthy, Byung Joon Park Jun 2004

Integrating Product Platform Development With Supply Chain Configuration In A Global Environment, Soumen Ghosh, Nagesh Murthy, Byung Joon Park

Research Collection Lee Kong Chian School Of Business

In this research, we have investigated the interaction between product platform development and supply chain configuration in a global environment. A comprehensive decision support model has been developed to simultaneously determine product strategy and supply chain configuration. By Products we refer to the bundle of module option alternatives offered to market segments, and product platform development is a means of looking for the opportunity of sharing module option alternatives among products. A scenario analysis has been performed to gain insights on how platform development is influenced by market conditions and current supply chain configuration. The analysis shows that different supply …

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Modified Art 2a Growing Network Capable Of Generating A Fixed Number Of Nodes, Ji He, Ah-Hwee Tan, Chew-Lim Tan May 2004

Modified Art 2a Growing Network Capable Of Generating A Fixed Number Of Nodes, Ji He, Ah-Hwee Tan, Chew-Lim Tan

Research Collection School Of Computing and Information Systems

This paper introduces the Adaptive Resonance Theory under Constraint (ART-C 2A) learning paradigm based on ART 2A, which is capable of generating a user-defined number of recognition nodes through online estimation of an appropriate vigilance threshold. Empirical experiments compare the cluster validity and the learning efficiency of ART-C 2A with those of ART 2A, as well as three closely related clustering methods, namely online K-Means, batch K-Means, and SOM, in a quantitative manner. Besides retaining the online cluster creation capability of ART 2A, ART-C 2A gives the alternative clustering solution, which allows a direct control on the number of output …

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Performance Planning, Quality-Of-Service, And Pricing Under Competition, Corinne Touati, Parijat Dube, Laura Wynter May 2004

Performance Planning, Quality-Of-Service, And Pricing Under Competition, Corinne Touati, Parijat Dube, Laura Wynter

Research Collection School Of Computing and Information Systems

In this work we model the relationship between the capacity and the Quality of Service (QoS) offered by the firm in a competitive scenario of two firm’s working to maximize their profits. Using simple queueing theoretic models we study the sensitivity of a firm’s market share to price, capacity and market size. Our preliminary studies yield important properties of the equilibrium solution which may further provide important “engineering” guidelines for performance planning and pricing strategies.

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A Stage Model For E-Government Implementation, Keng Siau, Y. Long May 2004

A Stage Model For E-Government Implementation, Keng Siau, Y. Long

Research Collection School Of Computing and Information Systems

With the advancement of wired and wireless technologies in recent years, the concept of an e-government has attracted increasing interests from both researchers and practitioners. The E-Government Act of 2002 was signed into law by President Bush to encourage government agencies to efficiently and effectively serve their customers over the Web. E-government presents a way for government agencies to use new technologies, such as the Internet, to provide citizens, businesses, and other governments with a more convenient access to government information and services, to improve the quality of services, and to provide greater opportunities for citizens to participate in democratic …

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From Efficiency-Driven To Innovation-Driven Economic Growth: Perspectives From Singapore, Kim Song Tan, Sock-Yong Phang May 2004

From Efficiency-Driven To Innovation-Driven Economic Growth: Perspectives From Singapore, Kim Song Tan, Sock-Yong Phang

Research Collection School Of Economics

The Singapore economy is going through a period of major restructuring. Economic stagnation since the 1997 Asia financial crisis (except for a brief recovery in 1999) has called into question the continued relevance of many fundamental policies that had worked well in the past. In 2002, a high-level Economic Review Committee (ERC) was convened by the government to chart new directions for the economy. A common thread that ran through the committee’s various reports was a call to enhance the economy’s innovative capacity, with the aim of making Singapore an innovation hub in the region. The call reflects an increased …

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Multi-Period Multi-Dimensional Knapsack Problem And Its Application To Available-To-Promise, Hoong Chuin Lau, M. K. Lim May 2004

Multi-Period Multi-Dimensional Knapsack Problem And Its Application To Available-To-Promise, Hoong Chuin Lau, M. K. Lim

Research Collection School Of Computing and Information Systems

This paper is motivated by a recent trend in logistics scheduling, called Available-to-Promise. We model this problem as the multi-period multi-dimensional knapsack problem. We provide some properties for a special case of a single-dimensional problem. Based on insights obtained from these properties, we propose a two-phase heuristics for solving the multi-dimensional problem. We also propose a novel time-based ant colony optimization algorithm. The quality of the solutions generated is verified through experiments, where we demonstrate that the computational time is superior compared with integer programming to achieve solutions that are within a small percentage of the upper bounds.

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Power Adaptation Based Optimization For Energy Efficient Reliable Wireless Paths, Suman Banerjee, Archan Misra May 2004

Power Adaptation Based Optimization For Energy Efficient Reliable Wireless Paths, Suman Banerjee, Archan Misra

Research Collection School Of Computing and Information Systems

We define a transmission power adaptation-based routing technique that finds optimal paths for minimum energy reliable data transfer in multi-hop wireless networks. This optimal choice of the transmission power depends on the link distance between the two nodes and the channel characteristics. Typical energy efficient routing techniques use a transmission power such that the received signal power at the destination minimally exceeds a desired threshold signal strength level. In this paper we argue that such a choice of the transmission power does not always lead to optimal energy routes, since it does not consider differences in the receiver noise levels.We …

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Toolglasses, Marking Menus, And Hotkeys: A Comparison Of One And Two-Handed Command Selection Techniques, Daniel L. Odell, Richard C. Davis, Andrew Smith, Paul K. Wright May 2004

Toolglasses, Marking Menus, And Hotkeys: A Comparison Of One And Two-Handed Command Selection Techniques, Daniel L. Odell, Richard C. Davis, Andrew Smith, Paul K. Wright

Research Collection School Of Computing and Information Systems

This paper introduces a new input technique, bimanual marking menus, and compares its performance with five other techniques: static toolbars, hotkeys, grouped hotkeys, marking menus, and toolglasses. The study builds on previous work by setting the comparison in a commonly encountered task, shape drawing. In this context, grouped hotkeys and bimanual marking menus were found to be the fastest. Subjectively, the most pre-ferred input method was bimanual marking menus. Toolglass performance was unexpectedly slow, which hints at the importance of low-level toolglass imple-mentation choices.

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Web Image Learning For Searching Semantic Concepts In Image Databases, Steven Hoi, Michael R. Lyu May 2004

Web Image Learning For Searching Semantic Concepts In Image Databases, Steven Hoi, Michael R. Lyu

Research Collection School Of Computing and Information Systems

Without textual descriptions or label information of images, searching semantic concepts in image databases is still a very challenging task. While automatic annotation techniques are yet a long way off, we can seek other alternative techniques to solve this difficult issue. In this paper, we propose to learn Web images for searching the semantic concepts in large image databases. To formulate effective algorithms, we suggest to engage the support vector machines for attacking the problem. We evaluate our algorithm in a large image database and demonstrate the preliminary yet promising results.

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The Fashion Of Management Fashion: A Surge Too Far?, Timothy Adrian Robert Clark Mar 2004

The Fashion Of Management Fashion: A Surge Too Far?, Timothy Adrian Robert Clark

Research Collection Lee Kong Chian School Of Business

In recent years there has been growing interest in the notion that management ideas and techniques are subject to swings in fashion in the same way that aesthetic aspects of life such as clothing styles, hair length, music tastes, furniture design, paint colours, and so forth are characterized by surges of popularity and then decline. Adopting a predominantly neo-institutional perspective, researchers have conceived of management fashions as techniques that fail to become firmly entrenched and institutionalized since organizations are attracted to them for a period and then abandon them in favour of apparently newer and more promising ones. Drawing on …

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A Modeling Framework For Computing Lifetime And Information Capacity In Wireless Sensor Networks, Enrique Duarte-Melo, Mingyan Liu, Archan Misra Mar 2004

A Modeling Framework For Computing Lifetime And Information Capacity In Wireless Sensor Networks, Enrique Duarte-Melo, Mingyan Liu, Archan Misra

Research Collection School Of Computing and Information Systems

In this paper we investigate the expected lifetime and information capacity, defined as the maximum amount of data (bits) transferred before the first sensor node death due to energy depletion, of a data-gathering wireless sensor network. We develop a fluidflow based computational framework that extends the existing approach, which requires precise knowledge of the layout/deployment of the network, i.e., exact sensor positions. Our method, on the other hand, views a specific network deployment as a particular instance (sample path) from an underlying distribution of sensor node layouts and sensor data rates.

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Authenticating Query Results In Edge Computing, Hwee Hwa Pang, Kian-Lee Tan Mar 2004

Authenticating Query Results In Edge Computing, Hwee Hwa Pang, Kian-Lee Tan

Research Collection School Of Computing and Information Systems

Edge computing pushes application logic and the underlying data to the edge of the network, with the aim of improving availability and scalability. As the edge servers are not necessarily secure, there must be provisions for validating their outputs. This paper proposes a mechanism that creates a verification object (VO) for checking the integrity of each query result produced by an edge server - that values in the result tuples are not tampered with, and that no spurious tuples are introduced. The primary advantages of our proposed mechanism are that the VO is independent of the database size, and that …

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The Evolution Of Research On Information Systems: A Fiftieth Year Survey Of The Literature In Management Science, Rajiv D. Banker, Robert J. Kauffman Mar 2004

The Evolution Of Research On Information Systems: A Fiftieth Year Survey Of The Literature In Management Science, Rajiv D. Banker, Robert J. Kauffman

Research Collection School Of Computing and Information Systems

The development of the information systems (IS) literature in Management Science during the past 50 years reflects the inception, growth, and maturation of several different research streams. The five research streams we identify incorporate different definitions of the managerial problems that relate to IS, the alternate theoretical perspectives and different methodological paradigms to study them, and the levels of the organization at which their primary results impact managerial practice. The decision support and design science research stream studies the application of computers in decision support, control, and managerial decision making. The value of information research stream reflects relationships established based …

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