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Measurement Of The Z Resonance Parameters At Lep, R. Barate, M. Thulasidas Jan 2000

Measurement Of The Z Resonance Parameters At Lep, R. Barate, M. Thulasidas

Research Collection School Of Computing and Information Systems

The properties of the Z resonance are measured from the analysis of 4.5 million Z decays into fermion pairs collected with the ALEPH detector at LEP. The data are consistent with lepton universality. The resonance parameters are measured to be MZ=(91.1885±0.0031)GeV/c2MZ=(91.1885±0.0031)GeV/c2, ΓZ=(2.4951±0.0043)ΓZ=(2.4951±0.0043) GeV, σ0had=(41.559±0.058)σhad0=(41.559±0.058) nb and, combining the three lepton flavours, Rℓ=20.725±0.039Rℓ=20.725±0.039. The corresponding number of light neutrino species is Nν=2.983±0.013Nν=2.983±0.013 and the strong coupling constant is αs(MZ)=0.114±0.004±0.002QCD+0.005log10[MH150GeV/c2]αs(MZ)=0.114±0.004±0.002QCD+0.005log10⁡[MH150GeV/c2]. The lepton pair forward-backward asymmetry is measured to be A0,ℓFB=0.0173±0.0016AFB0,ℓ=0.0173±0.0016 from which the effective weak mixing angle is derived: sin2θlepteff=0.23089±0.00089sin2⁡θefflept=0.23089±0.00089. The measurement of the leptonic width Γℓℓ=84.02±0.15Γℓℓ=84.02±0.15 MeV leads to a determination …

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Supervised Adaptive Resonance Theory And Rules, Ah-Hwee Tan Jan 2000

Supervised Adaptive Resonance Theory And Rules, Ah-Hwee Tan

Research Collection School Of Computing and Information Systems

Supervised Adaptive Resonance Theory is a family of neural networks that performs incremental supervised learning of recognition categories (pattern classes) and multidimensional maps of both binary and analog patterns. This chapter highlights that the supervised ART architecture is compatible with IF-THEN rule-based symbolic representation. Specifi­cally, the knowledge learned by a supervised ART system can be readily translated into rules for interpretation. Similarly, a priori domain knowl­edge in the form of IF-THEN rules can be converted into a supervised ART architecture. Not only does initializing networks with prior knowl­edge improve predictive accuracy and learning efficiency, the inserted symbolic knowledge can also …

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Some Remarks On Fair Exchange Protocol, Jianying Zhou, Robert H. Deng, Feng Bao Jan 2000

Some Remarks On Fair Exchange Protocol, Jianying Zhou, Robert H. Deng, Feng Bao

Research Collection School Of Computing and Information Systems

Fair exchange turns out to be an increasingly important topic due to the rapid growth of electronic commerce. An exchange is deemed to be fair if at the end of exchange, either each party receives the expected item or neither party receives any useful information about the other’s item. Several protocols for fair exchange have been proposed in recent years. In this paper, we first examine a newly published fair exchange protocol and point out its flaws and weaknesses. We then put forward a more efficient and secure protocol and give an informal analysis.

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Law And Values In Governance: The Singapore Way, Eugene K. B. Tan Jan 2000

Law And Values In Governance: The Singapore Way, Eugene K. B. Tan

Research Collection Yong Pung How School Of Law

The article examines the role of law and the legal system in catalysing Singapore's development success. It argues that there is a dichotomy in the approach with regard to commercial law and law relating to individual freedom and rights and civil society. Universalism characterises the treatment of commercial laws while cultural relativism and a communitarian-based understanding of rights and obligations are features of the law relating to the rights of the individual. Instrumentalism, driven by a particularistic 'communitarian' political philosophy underpinned by strong Confucianist values, is very much motivated by the need for good governance as a prerequisite for economic …

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Measurements Of The Structure Of Quark And Gluon Jets In Hadronic Z Decays, R. Barate, M. Thulasidas Jan 2000

Measurements Of The Structure Of Quark And Gluon Jets In Hadronic Z Decays, R. Barate, M. Thulasidas

Research Collection School Of Computing and Information Systems

An experimental investigation of the structure of identified quark and gluon jets is presented. Observables related to both the global and internal structure of jets are measured; this allows for tests of QCD over a wide range of transverse momentum scales. The observables include distributions of jet-shape variables, the mean and standard deviation of the subjet multiplicity distribution and the fragmentation function for charged particles. The data are compared with predictions of perturbative QCD as well as QCD-based Monte Carlo models. In certain kinematic regions the measurements are sensitive mainly to perturbatively calculable effects, allowing for a test of QCD. …

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Study Of Charm Production In Z Decays, R. Barate, M. Thulasidas Jan 2000

Study Of Charm Production In Z Decays, R. Barate, M. Thulasidas

Research Collection School Of Computing and Information Systems

The production rates of D∗±D∗±, D∗±sDs∗±, D±D±, D0/D¯0D0/D¯0, D±sDs±, and Λ+c/Λ¯−cΛc+/Λ¯c− in Z→cc¯Z→cc¯ decays are measured using the LEP I data sample recorded by the ALEPH detector. The fractional energy spectrum of the D∗±D∗± is well described as the sum of three contributions: charm hadronisation, b hadron decays and gluon splitting into a pair of heavy quarks. The probability for a c quark to hadronise into a D∗+D∗+ is found to be f(c→D∗+)=0.233±0.010(stat.)±0.011(syst.)f(c→D∗+)=0.233±0.010(stat.)±0.011(syst.). The average fraction of the beam energy carried by D∗±D∗± mesons in Z→cc¯Z→cc¯ events is measured to be ⟨XE(D∗±)⟩cc¯=0.4878±0.0046(stat.)±0.0061(syst.).⟨XE(D∗±)⟩cc¯=0.4878±0.0046(stat.)±0.0061(syst.). The D∗±D∗± energy and the hemisphere mass imbalance …

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An Integrated Data Mining System To Automate Discovery, Cecil Chua, Roger Hsiang-Li Chiang, Ee Peng Lim Jan 2000

An Integrated Data Mining System To Automate Discovery, Cecil Chua, Roger Hsiang-Li Chiang, Ee Peng Lim

Research Collection School Of Computing and Information Systems

Many data analysts require tools which can integrate their database management packages (e.g. Microsoft Access) with their data analysis ones (e.g. SAS, SPSS), and provide guidance for the selection of appropriate mining algorithms. In addition, the analysts need to extract and validate statistical results to facilitate data mining. In this paper, we describe an integrated data mining system called the Linear Correlation Discovery System (LCDS) that meets the above requirement. LCDS consists of four major sub-components, two of which, the selection assistant and the statistics coupler, are discussed in this paper. The former examines the schema and instances to determine …

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Solving A Supply Chain Optimization Problem Collaboratively, Hoong Chuin Lau, A. L. C. Lim, Q Liu Jan 2000

Solving A Supply Chain Optimization Problem Collaboratively, Hoong Chuin Lau, A. L. C. Lim, Q Liu

Research Collection School Of Computing and Information Systems

We propose a novel algorithmic framework to solve an integrated planning and scheduling problem in supply chain management. This problem involves the integration of an inventory management problem and the vehicle routing problem with time windows, both of which are known to be NP-hard. Under this framework, algorithms that solve the underlying sub-problems collaborate rigorously yet in a computationally efficient manner to arrive at a good solution. We will then present two algorithms to solve the inventory management problem: a complete mathematical model integrating integer programming with constraint programming, and an incomplete algorithm based on tabu search. We present experimental …

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Information Technology In The Health Care Industry: A Primer, P. Southard, S. J. Hong, Keng Siau Jan 2000

Information Technology In The Health Care Industry: A Primer, P. Southard, S. J. Hong, Keng Siau

Research Collection School Of Computing and Information Systems

The paper discusses current and future applications of information technology within the healthcareindustry. It presents some broad strategies for approaching information technology investments and various tools available.

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Resource Commitment, Entry Timing, And Market Performance Of Foreign Direct Investments In Emerging Economics: The Case Of Japanese International Joint Ventures In China, Takehiko Isobe, Shige Makino, David B. Montgomery Jan 2000

Resource Commitment, Entry Timing, And Market Performance Of Foreign Direct Investments In Emerging Economics: The Case Of Japanese International Joint Ventures In China, Takehiko Isobe, Shige Makino, David B. Montgomery

Research Collection Lee Kong Chian School Of Business

This study examined whether early movers and technology leaders attained superior performance in emerging economic regions. We assessed the determinants and performance consequences of two key aspects of entry strategy, resource commitment to technology transfer and timing of entry, using survey data from over 220 Sino-Japanese joint ventures (JVs) in China. Both high commitment and early entry had positive impacts on the perceived economic performance of the JVs. Yet these relationships were found to be significantly contingent on several internal and external factors, such as the strategic importance of an investment, parental control of a JV, and the availability of …

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The Implications Of The Knowledge Economy For Venture Promotion Policies, Teck Meng Tan, Wee Liang Tan Jan 2000

The Implications Of The Knowledge Economy For Venture Promotion Policies, Teck Meng Tan, Wee Liang Tan

Research Collection Lee Kong Chian School Of Business

The advent of the knowledge economy brings with it needed new public policy initiatives on the part of governments desiring to ensure that enterprises in their economies are able to participate and excel in this new arena. The knowledge economy brings with it opportunities for new ventures as it embroils the global economy in a revolution where information technology is a pervasive and enabling force; where knowledge is the critical asset. This paper explores the implications this revolution for small and medium-sized enterprises and suggests policy initiatives that would assist in promoting ventures for this brave new world.

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Similarities And Differences In European Conceptions Of Human Resource Management: Toward A Polycentric Study, Timothy Adrian Robert Clark, Derek Pugh Jan 2000

Similarities And Differences In European Conceptions Of Human Resource Management: Toward A Polycentric Study, Timothy Adrian Robert Clark, Derek Pugh

Research Collection Lee Kong Chian School Of Business

Increasingly managers need to distinguish between those oftheir activities and practices that can be successfully transferred acrossnational boundaries and those that will require modification in view ofdivergences between national settings. This can be determined by initiallyidentifying those features of managing organizations that remain similar acrossnational boundaries and those that are different, and then ascertaining thestrength of the forces for convergence or divergence. This article describes anexploratory attempt to conduct a polycentric (in the terms described below)research study of conceptions of human resource management in seven Europeancountries. It examines whether there is a single, shared conception of HRM thattranscends national boundaries, …

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Exploring Persistence In Financial Time Series, David K C. Lee Jan 2000

Exploring Persistence In Financial Time Series, David K C. Lee

Research Collection Lee Kong Chian School Of Business

If financial time series exhibits persistence or long-memory, then their unconditional probability distribution may not be normal. This has important implications for many areas in finance, especially asset pricing, option pricing, portfolio allocation and risk management. Furthermore, if the random walk does not apply, a wide range of results obtained by quantitative analysis may be inappropriate. The capital asset pricing model, the Black-Scholes option pricing formula, the concept of risk as standard deviation or volatility, and the use of Sharpe, Treynor, and other performance measures are not consistent with nonnormal distributions. Unfortunately, nonnormality is common among distributions of financial time …

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The E-Landscape: An Unexplored Goldmine Of The New Millennium, Thow Yick Liang Jan 2000

The E-Landscape: An Unexplored Goldmine Of The New Millennium, Thow Yick Liang

Research Collection Lee Kong Chian School Of Business

The Internet is an intangible cyberworld created by the human mind. Exploring and exploiting this e-landscape requires a totally redefined mindset. The fact that it exists in the mental realm also makes it a nonlinear system. In this respect, understanding both intangible and nonlinear dynamics is a requisite to the proper exploitation of e-commerce. The e-landscape is a new edge of chaos where order and disorder co-exist. It could be a goldmine for those who swiftly recognize structure in this highly disordered territory. The tremendous number of opportunities and uncertainties embedded in the submerged portion of this iceberg are still …

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On The Proper Use Of Box-Cox Transformation Method: A Note On A Taguchi Case Study, Zhenlin Yang Jan 2000

On The Proper Use Of Box-Cox Transformation Method: A Note On A Taguchi Case Study, Zhenlin Yang

Research Collection School Of Economics

In studying the role of transformation in the Taguchi method, Logothetis (1990) analyzed the data from a plasma etching process and concluded that the Box-Cox method can induce a mean bias in the variability performance measure which can inhibit the production of clearcut results. This paper points out that the above conclusion is in part due to an inappmpriate application of the Box-Cox method where the transformation parameter is determined from one model but the analysis is done on the other. Further, it may not be appropriate to state that Box-Cox method induces a mean bias, but rather that there …

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Dynamic Regressions With Variables Observed At Different Frequencies, Tilak Abeysinghe, Anthony S. Tay Jan 2000

Dynamic Regressions With Variables Observed At Different Frequencies, Tilak Abeysinghe, Anthony S. Tay

Research Collection School Of Economics

We consider the problem of formulating and estimating dynamic regression models with variables observed at different frequencies. The strategy adopted is to define the dynamics of the model in terms of the highest available frequency, and to apply certain lag polynomials to transform the dynamics so that the model is expressed solely in terms of observed variables. A general solution is provided for models with monthly and quarterly observations. We also show how the methods can be extended to models with quarterly and annual observations, and models combining monthly and annual observations.

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Entrepreneurial Infrastructure In Singapore: Developing A Model And Mapping Participation, Teck Meng Tan, Wee Liang Tan, John E. Young Jan 2000

Entrepreneurial Infrastructure In Singapore: Developing A Model And Mapping Participation, Teck Meng Tan, Wee Liang Tan, John E. Young

Research Collection Lee Kong Chian School Of Business

Entrepreneurial infrastructure, as the term is used in this article, represents the facilities and services present within a given geographic area which encourage the birth of new ventures and the growth and development of small- and medium- sized enterprises. The model of entrepreneurial infrastructure developed here and applied to the nation of Singapore suggests that they provide support to poten tial new business owners, owners of small growing businesses, and existing small- and medium-sized enterprises by way of assisting them with tasks, physical and monetary resources, information and knowledge. This article also develops a map ping function to predict the …

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The Long Term Effects Of Angiotensin Converting Enzyme Inhibition And Metabolic Control On Cardiovascular And Renal Outcomes In Hypertensive Type 2 Diabetic Patients, Julien C. N. Chan, Gary T. C. Ko, Denis H. Y. Leung Jan 2000

The Long Term Effects Of Angiotensin Converting Enzyme Inhibition And Metabolic Control On Cardiovascular And Renal Outcomes In Hypertensive Type 2 Diabetic Patients, Julien C. N. Chan, Gary T. C. Ko, Denis H. Y. Leung

Research Collection School Of Economics

Long-term effects of angiotensin-converting enzyme inhibition and metabolic control in hypertensive type 2 diabetic patients. Background. In hypertensive type 2 diabetic patients, treatment with angiotensin-converting enzyme (ACE) inhibitors is associated with a lower incidence of cardiovascular events than those treated with calcium channel-blocking agents. However, the long-term renal effects of ACE inhibitors in these patients remain inconclusive. In 1989, we commenced a placebo-controlled, double-blind, randomized study to examine the anti-albuminuric effects of enalapril versus nifedipine (slow release) in 102 hypertensive, type 2 diabetic patients. These patients have been followed up for a mean trial duration of 5.5 ± 2.2 years. …

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An Empirical Analysis Of Unit Trust Performance In Singapore, Joseph H. H. Chia, Yiu Kuen Tse Jan 2000

An Empirical Analysis Of Unit Trust Performance In Singapore, Joseph H. H. Chia, Yiu Kuen Tse

Research Collection School Of Economics

The Singapore government’s recent strategic plan to develop the financial sector has placed much emphasis on the fund management industry. In this paper we examine the unit trust performance in Singapore in the 90s. Our results show that fund managers in general performed poorly in security analysis and market timing. However, they performed fairly well in risk-adjusted returns and generally maintained well-diversified portfolios. We find that there is little consistency in the performance ranking of the evaluated portfolios, although there is evidence of repeat performance of some top funds. Our analysis also shows that fund managers could indeed make excess …

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The Integration Of Relationship Instances From Heterogeneous Databases, Ee Peng Lim, Roger Hsiang-Li Chiang Jan 2000

The Integration Of Relationship Instances From Heterogeneous Databases, Ee Peng Lim, Roger Hsiang-Li Chiang

Research Collection School Of Computing and Information Systems

In the process of integrating legacy databases, one has to resolve inter-database conflicts at both the schema and instance levels. In this paper, we discuss relationship conflicts as a special type of conflicts to be resolved during the database integration. Relationships are properties that relate real world objects. So far, most inter-database relationship conflicts are addressed at the schema-level by various schema integration techniques. However, instance-level relationship conflicts are largely neglected. This paper therefore investigates the causes of instance-level relationship conflicts and proposes a taxonomy for classifying instance-level relationship conflicts. In addition, we develop a systematic process to resolve instance-level …

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Inclusive Production Of Π0, Η, Η′ (958), Kg0s And Λ In Two- And Three-Jet Events From Hadronic Z Decays, R. Barate, M. Thulasidas Jan 2000

Inclusive Production Of Π0, Η, Η′ (958), Kg0s And Λ In Two- And Three-Jet Events From Hadronic Z Decays, R. Barate, M. Thulasidas

Research Collection School Of Computing and Information Systems

The production rates and the inclusive cross sections of the isovector meson π0π0, the isoscalar mesons ηη and η′(958)η′(958), the strange meson K0SKS0 and the ΛΛ baryon have been measured as functions of scaled energy in hadronic events, two-jet events and each jet of three-jet events from hadronic Z decays and compared to Monte Carlo models. The analysis is based on 3.7 million hadronic events collected with the ALEPH detector at LEP at a centre-of-mass energy of s√=91.2s=91.2 GeV. The JETSET modelling of the gluon fragmentation into isoscalar mesons is found to be in agreement with the experimental results. HERWIG …

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Does The Invisible Hand Need A Transparent Glove?, Ann Florini Jan 2000

Does The Invisible Hand Need A Transparent Glove?, Ann Florini

Research Collection School of Social Sciences

Transparency is on the rise, touted as the solution to such disparate problems asfinancial volatility, environmental degradation, money laundering, and corruption. Buttransparency faces much opposition, particularly from those under scrutiny. Such actorsoften have strong incentives to avoid providing information. To explain the growingdemand for transparency and to assess its prospects for success requires attention tomatters of politics – that is, power. Power is often needed to induce disclosures orrestructure incentives. And the information thus revealed can shift power from the formerholders of secrets to the newly informed. This paper explores the politics of transparency– why it is emerging, and what …

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Secrets For Sale: How Commercial Satellite Imagery Will Change The World, Yahya Dehqanzada, Ann Florini Jan 2000

Secrets For Sale: How Commercial Satellite Imagery Will Change The World, Yahya Dehqanzada, Ann Florini

Research Collection School of Social Sciences

Secrets for Sale presents the first in-depth analysis of the emerging commercial remote sensing industry. This timely publication examines the benefits and dilemmas created by the new industry, and provides badly needed policy recommendations on how and why to handle the new transparency right.

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Religion And Modernity: Ritual Transformations And The Reconstruction Of Space And Time, Chee Kiong Tong, Lily Kong Jan 2000

Religion And Modernity: Ritual Transformations And The Reconstruction Of Space And Time, Chee Kiong Tong, Lily Kong

Research Collection School of Social Sciences

In this paper, we use the case of Chinese religion in Singapore to examine the relationships between religion and modernity, and between social processes, on the one hand, and spatial conceptions, forms and structures and temporal practices, on the other. Specifically, we look at how traditional Chinese rituals are being modified, reinterpreted and invented to fit with modern living. Such ritual transformations entail reconstructed notions of space and time. Through such transformations, modernity does not simply lead to the demise of religious beliefs and practices but allows for a continued role for religion in providing a meaning system for Chinese …

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The Singapore Legal System – History, Theory And Practice, Andrew B.L. Phang Jan 2000

The Singapore Legal System – History, Theory And Practice, Andrew B.L. Phang

Research Collection Yong Pung How School Of Law

Law is central to order and stability and, without order and stability, societal as well as economic viability (let alone progress) are impossible The alternative is 'rule of man', and all the dangers of fallibility and (consequently) despotism that that entails. One central difficulty has, of course, been the maintenance of the argument that law is consonant with objective truth for if the law does not in fact possess this quality, then the 'rule of law' turns out to be the 'rule of man' after all. However, it is difficult, on rational grounds at least, to reject the concept of …

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Contract Law At Century's End: Some Personal Reflections, Andrew B.L. Phang Jan 2000

Contract Law At Century's End: Some Personal Reflections, Andrew B.L. Phang

Research Collection Yong Pung How School Of Law

As we approach the end of the second millennium, the common law of contract-transplanted via colonialism into many lands and climes-has indeed flourished. It has certainly developed apace in the land of its origin, England, but has also evolved in distinct directions elsewhere, particularly in Australia and New Zealand.2 But this development is simply part of a continuous process and a great many interesting issues remain to be considered at the commencement of the next millennium and beyond. This is due, in part, to the very diversity that has been briefly alluded to. However, even on a more general level, …

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E-Commerce Systems Development Methodologies, M. Rossi, Keng Siau, S. Purao Jan 2000

E-Commerce Systems Development Methodologies, M. Rossi, Keng Siau, S. Purao

Research Collection School Of Computing and Information Systems

Methodologies. This is the first time we organize this new minitrack on electronic commerce systems development. The flexibility, scalability, user-friendliness, privacy, security, intuitiveness, and other important characteristics of electronic commerce systems make the systems development process of such systems very multifaceted and complex. Today, most electronic commerce systems are built based on intuition and rule of thumbs.Many practitioners have the misconception that there is no need for a systematic modeling and design technique for these systems. The lack of appropriate methods and methodologies to support electronic commerce systems development is another stumbling block. Most of the widely used methods are …

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Evaluating A Change To Seminar-Style Teaching, Kirsten Anker, Catherine Dauvergne, Mark Findlay, Jenni Millbank Jan 2000

Evaluating A Change To Seminar-Style Teaching, Kirsten Anker, Catherine Dauvergne, Mark Findlay, Jenni Millbank

Research Collection Yong Pung How School Of Law

While the use of small to medium-sized seminar-style groups has long been a feature of some Australian law faculties, such as the University of New South Wales, it is a recent innovation in others, including the University of Western Australia and the University of Adelaide. In March 1996 the Faculty of Law at the University of Sydney made a decision to move from a traditional lecture and tutorial structure to seminar-style classes of limited size. This article discusses the reasons for the move away from a traditional lecture/ tutorial format to an interactive seminar-style model of teaching. The paper explains …

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Two Hundred Gastrointestinal Stromal Tumors: Recurrence Patterns And Prognostic Factors For Survival, Ronald P. Dematteo, Jonathan J. Lewis, Denis H. Y. Leung, Salvinder S. Mudan, James M. Woodruff, Murray F. Brennan Jan 2000

Two Hundred Gastrointestinal Stromal Tumors: Recurrence Patterns And Prognostic Factors For Survival, Ronald P. Dematteo, Jonathan J. Lewis, Denis H. Y. Leung, Salvinder S. Mudan, James M. Woodruff, Murray F. Brennan

Research Collection School Of Economics

Objective: To analyze the outcome of 200 patients with gastrointestinal stromal tumor (GIST) who were treated at a single institution and followed up prospectively. Summary Background Data: A GIST is a visceral sarcoma that arises from the gastrointestinal tract. Surgical resection is the mainstay of treatment because adjuvant therapy is unproven. Methods: Two hundred patients with malignant GIST were admitted and treated at Memorial Hospital during the past 16 years. Patient, tumor, and treatment variables were analyzed to identify patterns of tumor recurrence and factors that predict survival. Results: Of the 200 patients, 46% had primary disease without metastasis, 47% …

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Hong Kong And Singapore, Sock Yong Phang Jan 2000

Hong Kong And Singapore, Sock Yong Phang

Research Collection School Of Economics

There are many similarities between Hong Kong and Singapore. They have both enjoyed high rates of economic growth over the past three decades, averaging six percent a year in real terms. The two have become known as “East Asian Tigers,” having made the transition from poverty to newly industrialized economies in a relatively short time. Both started off as British colonies, with British legal and administrative systems, and made their living as trading ports serving their respective regions. Singapore has been an independent republic since 1965; Hong Kong was returned to China on July 1, 1997. While Hong Kong and …

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