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Role Of Use Case Diagram In Requirement Analysis, Keng Siau, L. Lee Aug 2001

Role Of Use Case Diagram In Requirement Analysis, Keng Siau, L. Lee

Research Collection School Of Computing and Information Systems

Since its debut and acceptance as a de facto standard of the object-oriented paradigm, UML has receivedcontroversial reviews. The most controversial diagramming technique in UML is undoubtedly the Use Casediagrams. Some claim that Use Case diagrams do not play a valuable role in requirement analysis. Othersargue that Use Case diagrams captured neither the static nor the dynamic aspects of the systems. The objective of this study is to investigate the role and value of Use Case diagrams in requirement analysis. We will investigate the information content of Use Case diagram and its role in requirement analysis.

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A Method For Fast Revocation Of Public Key Certificates And Security Capabilities, D. Boneh, Xuhua Ding, Gene Tsudik, Chi Ming Wong Aug 2001

A Method For Fast Revocation Of Public Key Certificates And Security Capabilities, D. Boneh, Xuhua Ding, Gene Tsudik, Chi Ming Wong

Research Collection School Of Computing and Information Systems

We present a new approach to fast certificate revocation centered around the concept of an on-line semi-trusted mediator (SEM). The use of a SEM in conjunction with a simple threshold variant of the RSA cryptosystem (mediated RSA) offers a number of practical advantages over current revocation techniques. Our approach simplifies validation of digital signatures and enables certificate revocation within legacy systems. It also provides immediate revocation of all security capabilities. This paper discusses both the architecture and implementation of our approach as well as performance and compatibility with the existing infrastructure. Our results show that threshold cryptography is practical for …

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Recent Advances In Content-Based Video Analysis, Chong-Wah Ngo, Ting-Chuen Pong, Hong-Jiang Zhang Jul 2001

Recent Advances In Content-Based Video Analysis, Chong-Wah Ngo, Ting-Chuen Pong, Hong-Jiang Zhang

Research Collection School Of Computing and Information Systems

In this paper, we present major issues in video parsing, abstraction, retrieval and semantic analysis. We discuss the success, the difficulties and the expectations in these areas. In addition, we identify important opened problems that can lead to more sophisticated ways of video content analysis. For video parsing, we discuss topics in video partitioning, motion characterization and object segmentation. The success in video parsing, in general, will have a great impact on video representation and retrieval. We present three levels of abstracting video content by scene, keyframe and key object representations. These representation schemes in overall serve as a good …

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Application-Centric Analysis Of Ip-Based Mobility Management Techniques, Archan Misra, Subir Das, Prathima Agrawal Jul 2001

Application-Centric Analysis Of Ip-Based Mobility Management Techniques, Archan Misra, Subir Das, Prathima Agrawal

Research Collection School Of Computing and Information Systems

This paper considers three applications—VoIP, mobile Web access and mobile server-based data transfers—and evaluates the applicability of various IP-based mobility management mechanisms. We first survey the features and characteristics of various IP mobility protocols, such as MIPv4, MIPv6, MIP-RO, SIP, CIP, HAWAII, MIP-RR and IDMP, and then evaluate their utility on an application-specific basis. The diversity in the mobility-related requirements ensures that no single mobility solution is universally applicable. We recommend a hierarchical mobility architecture. The framework uses our Dynamic Mobility Agent (DMA) architecture for managing intra-domain mobility and multiple application-based binding protocols for supporting inter-domain mobility. Thus, we recommend …

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Secure And Private Distribution Of Online Video And Some Related Cryptographic Issues, Feng Bao, Robert H. Deng, Peirong Bao, Yan Guo, Hongjun Wu Jul 2001

Secure And Private Distribution Of Online Video And Some Related Cryptographic Issues, Feng Bao, Robert H. Deng, Peirong Bao, Yan Guo, Hongjun Wu

Research Collection School Of Computing and Information Systems

With the rapid growth of broadband infrastructure, it is thought that the bottleneck for video-on-demand service through Internet is being cleared. However, digital video content protection and consumers privacy protection emerge as new major obstacles. In this paper we propose an online video distribution system with strong content security and privacy protection. We mainly focus on the study of security and privacy problems related to the system. Besides presenting the new system, we intensively discuss some relevant cryptographic issues, such as content protection, private information retrieval, super-speed encryption/decryption for video, and PKC with fast decryption etc. The paper can be …

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Mobile Commerce: Promises, Challenges And Research Agenda, Keng Siau, Ee Peng Lim Jul 2001

Mobile Commerce: Promises, Challenges And Research Agenda, Keng Siau, Ee Peng Lim

Research Collection School Of Computing and Information Systems

Advances in wireless technology increase the number of mobile device users and give pace to the rapid development of e-commerce using these devices. The new type of e-commerce, conducting transactions via mobile terminals, is called mobile commerce. Due to its inherent characteristics such as ubiquity, personalization, flexibility, and dissemination, mobile commerce promises businesses unprecedented market potential, great productivity, and high profitability. This paper presents an overview of mobile commerce development by examining the enabling technologies, the impact of mobile commerce on the business world, and the implications to mobile commerce providers. The paper also provides an agenda for future research …

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Mapping 'New' Geographies Of Religion: Politics And Poetics In Modernity, Lily Kong Jun 2001

Mapping 'New' Geographies Of Religion: Politics And Poetics In Modernity, Lily Kong

Research Collection School of Social Sciences

This article reviews geographical research on religion in the 1990s, and highlights work from neighbouring disciplines where relevant. Contrary to views that the field is incoherent, I suggest that much of the literature pays attention to several key themes, particularly, the politics and poetics of religious place, identity and community. I illustrate the key issues, arguments and conceptualizations in these areas, and suggest various ways forward. These 'new' geographies emphasize different sites of religious practice beyond the 'officially sacred'; different sensuous sacred geographies; different religions in different historical and place-specific contexts; different geographical scales of analysis; different constitutions of population …

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Intelligent Island Discourse: Singapore’S Discursive Negotiation With Technology, Alwyn Lim Jun 2001

Intelligent Island Discourse: Singapore’S Discursive Negotiation With Technology, Alwyn Lim

Research Collection School of Social Sciences

The small nation-state of Singapore has increasingly been referred to in the popular media as the Intelligent Island of the future. With significant state investment in the promotion and dissemination of information-communications technology and attendant social ramifications, this has become an area that can no longer be ignored or taken for granted. This article intends to map the conditions of possibility on which Singapore can be conceived of as an Intelligent Island, in situating the role of information technology and Intelligent Island discourse within the discourses of postcoloniality, technocapitalism, late modernity, and globalization. In particular, this article attempts to show …

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Foreign Country Priorities In The Internationalization Process: A Measure And An Exploratory Test On British Firms, Timothy Adrian Robert Clark, Derek S. Pugh Jun 2001

Foreign Country Priorities In The Internationalization Process: A Measure And An Exploratory Test On British Firms, Timothy Adrian Robert Clark, Derek S. Pugh

Research Collection Lee Kong Chian School Of Business

After a critical analysis of the psychic distance aspect of the Uppsala model of internationalization and empirical studies to test it, this paper proposes a measure to enable comparison between target foreign countries in the priority given them in the internationalization process. An International Priority Index is developed for each target country, and used as the dependent variable in a model to analyze the effects of the independent variables of size of market, affluence of market, geographical distance and cultural distance on foreign country priority choice of home country firms. The measure and the model are given a first test …

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Foreign Policy Issues Facing The New Administration: Introduction [Randolph W. Thrower Symposium], Howard Hunter Jun 2001

Foreign Policy Issues Facing The New Administration: Introduction [Randolph W. Thrower Symposium], Howard Hunter

Research Collection Yong Pung How School Of Law

No abstract provided.

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Implementation And Performance Evaluation Of Telemip, Kaushik Chakraborty, Archan Misra, Subir Das, Anthony J. Mcauley, Ashutosh Dutta, Sajal K. Das Jun 2001

Implementation And Performance Evaluation Of Telemip, Kaushik Chakraborty, Archan Misra, Subir Das, Anthony J. Mcauley, Ashutosh Dutta, Sajal K. Das

Research Collection School Of Computing and Information Systems

In this paper, we present our implementation of TeleMIP a two-level architecture for IP based mobility management TeleMIP essentially uses an Intra-Domain Mobility Management Protocol IDMP for managing mobility within a domain and Mobile IP for supporting inter-domain global mobility. Unlike other proposed schemes for intra-domain mobility management IDMP uses two care of addresses for mobility management The global care of address is relatively stable and identifies the mobile nodes current domain[1] while the local care of address changes every time the mobile changes subnets and identifies the mobiles current point of attachment. The paper describes our TeleMIP implementation based …

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Effect Of Exponential Averaging On The Variability Of A Red Queue, Archan Misra, Teunis Ott, John Baras Jun 2001

Effect Of Exponential Averaging On The Variability Of A Red Queue, Archan Misra, Teunis Ott, John Baras

Research Collection School Of Computing and Information Systems

The paper analyzes how using a longer memory of the past queue occupancy in computing the average queue occupancy affects the stability and variability of a RED queue. Extensive simulation studies with both persistent and Web TCP sources are used to study the variance of the RED queue as a function of the memory of the averaging process. Our results show that there is very little performance improvement (and in fact, possibly significant performance degradation) if the length of memory is increased beyond a very small value. Contrary to current practice, our results show that a longer memory reduces the …

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Genetic Algorithms For Communications Network Design - An Empirical Study Of The Factors That Influence Performance, Hsinghua Chou, G. Premkumar, Chao-Hsien Chu Jun 2001

Genetic Algorithms For Communications Network Design - An Empirical Study Of The Factors That Influence Performance, Hsinghua Chou, G. Premkumar, Chao-Hsien Chu

Research Collection School Of Computing and Information Systems

We explore the use of GAs for solving a network optimization problem, the degree-constrained minimum spanning tree problem. We also examine the impact of encoding, crossover, and mutation on the performance of the GA. A specialized repair heuristic is used to improve performance. An experimental design with 48 cells and ten data points in each cell is used to examine the impact of two encoding methods, three crossover methods, two mutation methods, and four networks of varying node sizes. Two performance measures, solution quality and computation time, are used to evaluate the performance. The results obtained indicate that encoding has …

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Communication And Shared Reality: Implications For The Psychological Foundations Of Culture, Ivy Yee-Man Lau, Chi-Yue Chiu, Sau-Lai Lee Jun 2001

Communication And Shared Reality: Implications For The Psychological Foundations Of Culture, Ivy Yee-Man Lau, Chi-Yue Chiu, Sau-Lai Lee

Research Collection School of Social Sciences

Lau et al present a conceptualization of the evolution of shared beliefs from individual interactions, focusing on the role of communication. They argue that the reciprocal relationship between shared reality and communication enables the development of systems of social representations at an individual level.

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Idmp-Based Fast Handoffs And Paging In Ip-Based Cellular Networks, Archan Misra, Subir Das, Ashutosh Dutta, Sajal K. Das May 2001

Idmp-Based Fast Handoffs And Paging In Ip-Based Cellular Networks, Archan Misra, Subir Das, Ashutosh Dutta, Sajal K. Das

Research Collection School Of Computing and Information Systems

We consider the use of our previously proposed Intra-Domain Mobility Management Protocol (IDMP) in fourth-generation mobile networks. On evaluating the heterogeneous access technologies, cellular layouts, and application characteristics of 4G environments, we realize a need to reduce both handoff latency and the frequency of mobility-related signaling. We first present IDMP's fast intradomain handoff mechanism that uses a duration-limited proactive packet multicasting solution. We quantify the expected buffering requirements of our proposed multicasting scheme for typical 4G network characteristics and compare it with alternative IP-based fast handoff solutions. We also present a paging scheme under IDMP that replicates the current cellular …

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The Next Wave In Erp Implementation, Keng Siau, Y. Tian May 2001

The Next Wave In Erp Implementation, Keng Siau, Y. Tian

Research Collection School Of Computing and Information Systems

Although the benefits of ERP are obvious, the risks and costs associated with it are very high. Some problems in implementing ERP system are documented, but the real challenge comes from the Internet and E-business. ERP is an enterprise wide system whose purpose is to achieve internal efficiency, while E-business cuts across different enterprises and extends the individual value chain into an Internet based, dynamic process aimed at maximizing external efficiency. To survive the E-business challenge, the arguably single, and also the best, solution for ERP systems is to integrate with E-business applications, which we call ERP II. By properly …

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Mapping The Discipline Of The Olympic Games: An Author Cocitation Analysis, Peter Warning, Rosie Ching, Kristine Toohey Apr 2001

Mapping The Discipline Of The Olympic Games: An Author Cocitation Analysis, Peter Warning, Rosie Ching, Kristine Toohey

Research Collection School Of Economics

The authors conducted an author cocitation analysis on prominent authors writing about the Olympics during the 1990s. Author cocitation is an established bibliometric technique that can be used to measure the relative similarities of topics written about by the cited authors. This enables a visual representation of the “intellectual space” of the discipline, in this case the Olympics, to be created for the period under review. So core and peripheral research areas are identified, along with their major contributors. The representation appears as a two-dimensional cluster-enhanced map. Subject expertise was then applied to the results to place labels on the …

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Topic Detection, Tracking, And Trend Analysis Using Self-Organizing Neural Networks, Kanagasabai Rajaraman, Ah-Hwee Tan Apr 2001

Topic Detection, Tracking, And Trend Analysis Using Self-Organizing Neural Networks, Kanagasabai Rajaraman, Ah-Hwee Tan

Research Collection School Of Computing and Information Systems

We address the problem of Topic Detection and Tracking (TDT) and subsequently detecting trends from a stream of text documents. Formulating TDT as a clustering problem in a class of self-organizing neural networks, we propose an incremental clustering algorithm. On this setup we show how trends can be identified. Through experimental studies, we observe that our method enables discovering interesting trends that are deducible only from reading all relevant documents.

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Understanding The Assessment Center Process: Where Are We Now?, Filip Lievens, Richard J Klimoski Apr 2001

Understanding The Assessment Center Process: Where Are We Now?, Filip Lievens, Richard J Klimoski

Research Collection Lee Kong Chian School Of Business

Assessment centers have become widespread in Western Europe, Northern America, and Australia (Newell & Shackleton, 1994). The Task Force on Assessment Center Guidelines (1989) defined assessment centers as “a standardized evaluation of behavior based on multiple inputs. Multiple trained observers and techniques are used. Judgments about behaviors are made, in major part, from specifically developed assessment simulations. These judgments are pooled in a meeting among the assessors or by a statistical integration process” (p. 460).

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Predictive Self-Organizing Networks For Text Categorization, Ah-Hwee Tan Apr 2001

Predictive Self-Organizing Networks For Text Categorization, Ah-Hwee Tan

Research Collection School Of Computing and Information Systems

This paper introduces a class of predictive self-organizing neural networks known as Adaptive Resonance Associative Map (ARAM) for classification of free-text documents. Whereas most sta- tistical approaches to text categorization derive classification knowledge based on training examples alone, ARAM performs supervised learn- ing and integrates user-defined classification knowledge in the form of IF-THEN rules. Through our experiments on the Reuters-21578 news database, we showed that ARAM performed reasonably well in mining categorization knowledge from sparse and high dimensional document feature space. In addition, ARAM predictive accuracy and learning efficiency can be improved by incorporating a set of rules derived from …

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Technology Transfer Into China: Preparing For A New Era, Arnoud De Meyer Apr 2001

Technology Transfer Into China: Preparing For A New Era, Arnoud De Meyer

Research Collection Lee Kong Chian School Of Business

Currently, there are three forces creating a more favourable background for western multinational companies to do new business in China by transferring new technology. First, growing overcapacity means China requires not traditional turnkey factories, but instead, technology which leads to innovation and improvement. Second, a changing attitude by all levels of Chinese government to demanding state-of-the-art technology including software instead of previous generation technology, and to technology management and commercial implementation more. Third, intellectual property rights are becoming better respected. The author makes suggestions to best manage technology transfer into China, with this changed background. Based on six case studies …

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Validation Of Tissue Microarrays For Immunohistochemical Profiling Of Cancer Specimens Using The Example Of Human Fibroblastic Tumors, Axel Hoos, M. J. Urist, A. Stojadinovic, S. Mastorides, M. Dudas, Denis H. Y. Leung Apr 2001

Validation Of Tissue Microarrays For Immunohistochemical Profiling Of Cancer Specimens Using The Example Of Human Fibroblastic Tumors, Axel Hoos, M. J. Urist, A. Stojadinovic, S. Mastorides, M. Dudas, Denis H. Y. Leung

Research Collection School Of Economics

Tissue microarrays allow high-throughput molecular profiling of cancer specimens by immunohistochemistry. Phenotype information of sections from arrayed biopsies on a multitissue block needs to be representative of full sections, as protein expression varies throughout the entire tumor specimen. To validate the use of tissue microarrays for immunophenotyping, we studied a group of 59 fibroblastic tumors with variable protein expression patterns by immunohistochemistry for Ki-67, p53, and the retinoblastoma protein (pRB). Data on full tissue sections were compared to the results of one, two, and three 0.6-mm core biopsies per tumor on a tissue array. Ki-67 and p53 staining was read …

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The Role Of Boards And Stakeholders In Corporate Governance, Victor C. S. Yeo, Pearlie M. C. Koh Apr 2001

The Role Of Boards And Stakeholders In Corporate Governance, Victor C. S. Yeo, Pearlie M. C. Koh

Research Collection Yong Pung How School Of Law

This paper was written specifically for the OECD Third Asian Roundtable on Corporate Governance, held in Singapore in April 2001, the theme of which was "the Role of Boards and Stakeholders in Corporate Governance". It goes without saying that a significant part of corporate governance is about managerial control and accountability. The duties imposed on directors, how Board members are chosen, Board composition, the interaction between members, the roles and responsibilities that Boards undertake, both as a whole and by their individual members, all have significant impact on the efficacy and propriety of the Board in fulfilling its functions. This …

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Tcp Hack: Tcp Header Checksum Option To Improve Performance Over Lossy Links, Rajesh Krishna Balan, Boon Peng Lee, Renjish Kumar, Jacob Lillykutty, Winston Seah, A. L. Ananda Apr 2001

Tcp Hack: Tcp Header Checksum Option To Improve Performance Over Lossy Links, Rajesh Krishna Balan, Boon Peng Lee, Renjish Kumar, Jacob Lillykutty, Winston Seah, A. L. Ananda

Research Collection School Of Computing and Information Systems

Wireless networks have become increasingly common and an increasing number of devices are communicating with each other over lossy links. Unfortunately, TCP performs poorly over lossy links as it is unable to differentiate the loss due to packet corruption from that due to congestion. We present an extension to TCP which enables TCP to distinguish packet corruption from congestion in lossy environments resulting in improved performance. We refer to this extension as the HeAder ChecKsum option (HACK). We implemented our algorithm in the Linux kernel and performed various tests to determine its effectiveness. Our results have shown that HACK performs …

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Cryptanalysis Of A Digital Signature Scheme On Id-Based Key-Sharing Infrastructures, Hongjun Wu, Feng Bao, Robert H. Deng Feb 2001

Cryptanalysis Of A Digital Signature Scheme On Id-Based Key-Sharing Infrastructures, Hongjun Wu, Feng Bao, Robert H. Deng

Research Collection School Of Computing and Information Systems

At ISW’99, Nishioka, Hanaoka and Imai proposed a digital signature scheme on ID-based key-sharing infrastructures. That signature scheme is claimed to be secure if the discrete logarithm problem is hard to solve. Two schemes (the ID-type and the random-type schemes) based on the linear scheme for the Key Predistribution Systems (KPS) and the discrete logarithm problem (DLP) were given. In this paper we show that those two schemes fail to meet the nonrepudiation requirement: with negligible amount of computation, a signature could be forged. For the ID-type signature scheme, any verifier could forge a signature to raise repudiation between that …

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Cryptanalysis Of Two Sparse Polynomial Based Public Key Cryptosystems, Feng Bao, Robert H. Deng, Willi Geiselmann, Claus Schnorr, Rainer Steinwandt, Hongjun Wu Feb 2001

Cryptanalysis Of Two Sparse Polynomial Based Public Key Cryptosystems, Feng Bao, Robert H. Deng, Willi Geiselmann, Claus Schnorr, Rainer Steinwandt, Hongjun Wu

Research Collection School Of Computing and Information Systems

The application of sparse polynomials in cryptography has been studied recently. A public key encryption scheme EnRoot [4] and an identification scheme SPIFI [1] based on sparse polynomials were proposed. In this paper, we show that both of them are insecure. The designers of SPIFI proposed the modified SPIFI [2] after Schnorr pointed out some weakness in its initial version. Unfortunately, the modified SPIFI is still insecure. The same holds for the generalization of EnRoot proposed in [2].

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Singapore Management University Report To Stakeholders 2001 - 2002, Singapore Management University Jan 2001

Singapore Management University Report To Stakeholders 2001 - 2002, Singapore Management University

Report to Stakeholders

If the first year of incorporation was the paving of the foundation for SMU, the second year was one of laying the first building blocks. For the university, this was a year for surging ahead – of exploration and adventure. With a sizeable student population, a faculty of international repute and two schools going on three, SMU is growing from strength to strength at an unbelievable rate. But beyond sheer numbers, I sense and see a spirit of fervour and adventure in the work of students, faculty and staff in every corner of this institution that we have founded. Our …

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Mentors Or Friends: Confucius And Aristotle On Equality And Ethical Development In Friendship, Sor-Hoon Tan Jan 2001

Mentors Or Friends: Confucius And Aristotle On Equality And Ethical Development In Friendship, Sor-Hoon Tan

Research Collection School of Social Sciences

In Thinking from the Han, David Hall and Roger Ames compare Plato's - and Confucius's views of friendship in relation to the question of transcendence and arrive at the sad conclusion that Socrates and Confucius could not be friends. "Socratic irony would not allow the inequality Confucius requires as a means of self-betterment. Confucius would not permit he and Socrates to hold all things in common." Along the way, they articulate an understanding of Confucius’ view of friendship as "a one-directional relationship in which one extends oneself by association with one who has attained a higher level of realization." Hall …

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Can A Liberal Society Tolerate Illiberal Elements?, Chandran Kukathas Jan 2001

Can A Liberal Society Tolerate Illiberal Elements?, Chandran Kukathas

Research Collection School of Social Sciences

Libertarians believe that all individuals are entitledto live as they choose, free from interference byother persons or by the state. They also believethat in the absence of such interference, whether bygovernment or other agents of the state intent ondesigning or planning for society as a whole, order willnonetheless prevail. Given the freedom to contract andexchange, markets will coordinate the production anddistribution of goods — and indeed do so better thanany other institution can.

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Information And Communication Technology And Poverty: An Asian Perspective, M. G. Quibria, Feichin, Ted Tschang Jan 2001

Information And Communication Technology And Poverty: An Asian Perspective, M. G. Quibria, Feichin, Ted Tschang

Research Collection Lee Kong Chian School Of Business

Many commentators have extolled the virtues of new information and communication technologies (ICTs) in reducing poverty and improving the quality of life. While such arguments have been used before in relation to many predecessor technologies, including other earlier communications technologies, the promise has often floundered. This paper attempts to provide a more balanced analysis of the question, by exploring the linkages between the new ICTs and poverty reduction. It examines the linkages in two ways: the potential for direct impacts of ICTs on various areas of poverty and development, and the indirect impacts of ICTs on economic growth, exports and …

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