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Joint Variance Ratio Tests Of The Martingale Hypothesis For Exchange Rates, Wai Mun Fong, Benedict Seng Kee Koh, Sam Ouliaris Jan 1997

Joint Variance Ratio Tests Of The Martingale Hypothesis For Exchange Rates, Wai Mun Fong, Benedict Seng Kee Koh, Sam Ouliaris

Research Collection Lee Kong Chian School Of Business

There is considerable interest in whether exchange rates behave like martingales. Liu and He tested the martingale hypothesis for exchange rates using the variance-ratio methodology of Lo and MacKinlay. They found that exchange rates have violated the martingale property since the inception of floating rates in 1973. Liu and He did not consider the joint implications of their tests, however. In this article, we reassess the martingale hypothesis for exchange rates using the joint tests developed by Hochberg and by Richardson and Smith. Contrary to the findings of Liu and He, the joint tests indicate that the martingale model worked …

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Moderating Effects Of Tolerance For Ambiguity And Risktaking Propensity On The Role Conflict-Perceived Performance Relationship: Evidence From Singapore Entrepreneurs, Hai Yap Teoh, See Liang Foo Jan 1997

Moderating Effects Of Tolerance For Ambiguity And Risktaking Propensity On The Role Conflict-Perceived Performance Relationship: Evidence From Singapore Entrepreneurs, Hai Yap Teoh, See Liang Foo

Research Collection School Of Accountancy

This study investigates the effects of tolerance for ambiguity and risktaking propensity in mediating the relationships between role conflict and perceived performance among 70 entrepreneurs in small and medium-sized businesses in Singapore. Entrepreneurial activity has been widely recognized as a major factor driving Singapore's economic development. Further insights therefore can be gained by this study, which addresses the above issues from the perspective of Singaporean entrepreneurs. As founders of their enterprises, entrepreneurs are often involved with many aspects of activities that create a high potential for conflict, having to play multiple roles, coping with competing and conflicting demands, and overcoming …

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Measurement Of The Spectral Functions Of Vector Current Hadronic Tau Decays, R. Barate, M. Thulasidas Jan 1997

Measurement Of The Spectral Functions Of Vector Current Hadronic Tau Decays, R. Barate, M. Thulasidas

Research Collection School Of Computing and Information Systems

A measurement of the spectral functions of non-strange τ vector current final states is presented, using 124 358 τ pairs recorded by the ALEPH detector at LEP during the years 1991 to 1994. The spectral functions of the dominant two- and four-pion τ decay channels are compared to published results of e + e - annihilation experiments via isospin rotation. A combined fit of the pion form factor from τ decays and e + e - data is performed using different parametrizations. The mass and the width of the ρ ±(770) and the ρ 0(770) are separately determined in order …

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Improved Measurement Of The Bd0 -B̄D0 Oscillation Frequency, D. Buskulic, M. Thulasidas Jan 1997

Improved Measurement Of The Bd0 -B̄D0 Oscillation Frequency, D. Buskulic, M. Thulasidas

Research Collection School Of Computing and Information Systems

The time dependence of B0 d {B 0 d oscillations is measured by the ALEPH experiment at LEP, using three techniques, two of which are updates of previous measurements. In all cases the charge of the decaying b quark and its decay time are measured in one hemisphere of the event; the quark charge at production is tagged mainly using the opposite hemisphere. The first method uses the charge correlation between a D and a lepton in the opposite hemisphere; if no lepton is present, the produced quark charge is determined from the hemisphere charges. In the second method, the …

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Measurement Of The Τ Lepton Lifetime With The Three-Dimensional Impact Parameter Method, R. Barate, M. Thulasidas Jan 1997

Measurement Of The Τ Lepton Lifetime With The Three-Dimensional Impact Parameter Method, R. Barate, M. Thulasidas

Research Collection School Of Computing and Information Systems

A new method is presented for the measurement of the mean lepton lifetime using events in which are pair-produced and both's decay to hadrons.

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Transverse Momentum Correlations In Hadronic Z Decays, D. Buskulic, M. Thulasidas Jan 1997

Transverse Momentum Correlations In Hadronic Z Decays, D. Buskulic, M. Thulasidas

Research Collection School Of Computing and Information Systems

Using data obtained with the ALEPH detector at the Z resonance, a measure based on transverse momentum is shown to exhibit a correlation between the two halves of a hadronic event which cannot be explained by energy-momentum conservation, flavour conservation, the imposition of an event axis or imperfect event reconstruction. Two possible interpretations based on existing Monte Carlo models are examined: a) ARIADNE, with the correlation forming early in the parton shower and with the transition from partons to hadrons playing only a minor part; b) JETSET, with the correlation forming at the fragmentation stage. A correlation technique based on …

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Culture And Capital In Urban Change: The Constitutive Relationship Between Development Imperatives And Symbolic Values In Singapore's Built Environment, Lily Kong Jan 1997

Culture And Capital In Urban Change: The Constitutive Relationship Between Development Imperatives And Symbolic Values In Singapore's Built Environment, Lily Kong

Research Collection School of Social Sciences

Over the last three decades, Singapore has undergone tremendous urban change. These changes have been premised on the logic and rationality of economic planning, in which development goals have taken precedence over other symbolic values, be they historic, cultural, sacred, personal, social or aesthetic. In recent years, however, there has been tangible evidence that parts of the urban fabric are being retained, a reflection perhaps of increasing appreciation of the cultural and historical values of these built forms. Given this scenario, my intention in this paper is to explore the interconnections between symbolic values in the urban landscape, on the …

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Hong Kong In United States-China Relations: The International Politics Of Hong Kong's Reversion To Chinese Sovereignty, James T. H. Tang Jan 1997

Hong Kong In United States-China Relations: The International Politics Of Hong Kong's Reversion To Chinese Sovereignty, James T. H. Tang

Research Collection School of Social Sciences

This article examines the implications of the political transition of Hong Kong onUS-China relations in strategic, political and economic dimensions. It evaluates the impactof Hong Kong's changing status in the context of the engagement-containment debate onChina policy in the US. It suggests that US concerns over questions such as democracy andhuman rights and China's rejection of foreign interference' in Hong Kong would turn theterritory into a source of political conflict between the US and China. Finally it points outthat any major trade confrontation between the two countries would have serious implicationsfor the territory. The article concludes by arguing that if …

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Nature And Nurture, Danger And Delight: Urban Women's Experiences Of The Natural World, Lily Kong, Belinda Yuen, Clive Briffett, Navjot S. Sodhi Jan 1997

Nature And Nurture, Danger And Delight: Urban Women's Experiences Of The Natural World, Lily Kong, Belinda Yuen, Clive Briffett, Navjot S. Sodhi

Research Collection School of Social Sciences

In this paper, we address a research lacuna in the area of human experience of, and interaction with, nature. We focus on women in an urbanized setting, exploring their actual and desired experiences of the natural world, using Singapore as a case study. Our intention is to contribute to both the evolving theoretical and empirical discussions on this subject. Based on data collected from focus group discussions and household questionnaires, we conclude that women's relationships with nature in Singapore are underscored by a strong inclination towards nurturing: teaching, tending and caring, in a way that is not as apparent in …

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The Opening Price Behavior: Foreign Exchange Futures Market Versus Equity Market, Quentin C. Chu, David K. Ding, C. S. Pyun Jan 1997

The Opening Price Behavior: Foreign Exchange Futures Market Versus Equity Market, Quentin C. Chu, David K. Ding, C. S. Pyun

Research Collection Lee Kong Chian School Of Business

Daily opening, noon, and closing prices of Deutschemark and Japanese yen futures are examined for the efficiency of the foreign exchange futures (FXF) market. Variance ratio and multiple variance ratio tests, are employed. The prices are found to be serially uncorrelated. This random walk behavior sheds light on the differences between the FXF and commodity or equity markets. The conclusions suggest that the FXF market is a 24-hour global market, reflecting a disparity with equity markets where round-the-clock trading is advocated since the high volatility during market opening would be eliminated, leading to potential cost reductions for traders as spreads …

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Crime, Community Penalty And Integration With Legal Formalism In The South Pacific, Mark Findlay Jan 1997

Crime, Community Penalty And Integration With Legal Formalism In The South Pacific, Mark Findlay

Research Collection Yong Pung How School Of Law

The influence of introduced legality on prevailing culture, and vice versa, are common concerns for analysis when considering the existence and development of customary law. Much of the limited writing on law and custom prefers to speculate on the impact of introduced law on already present modes of regulation. While recognising these structuralist contexts of influence, often oversimplified as they are represented, this paper prefers to explore the adaptation of legal formalism in contexts of resilient and resonant custom.Further, the paper examines instances where despite the fact that custom has modified institutional legality, the latter claims predominance over culture or …

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Comment On 'Profits Derived From Breach Of Contract Or Restitution', Howard Hunter Jan 1997

Comment On 'Profits Derived From Breach Of Contract Or Restitution', Howard Hunter

Research Collection Yong Pung How School Of Law

There is little with which to disagree in Professor Waddams' paper on the categorisation of damage recoveries in the cases posited, viz, those involving a breach which results in benefit to the breaching party but no loss of any consequence to the nonbreaching party. If the goal of contract remedies is to compensate the plaintiff for loss, then, presumably, there should be no recovery at all in such cases. At most there might be nominal damages to compensate for some transaction costs or perhaps as a ’declaration of rights’. In some of the cases considered by Waddams, breach might be …

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Integrated Queries To Existing Bibliographic And Structured Databases, Ee Peng Lim, Ying Lu Jan 1997

Integrated Queries To Existing Bibliographic And Structured Databases, Ee Peng Lim, Ying Lu

Research Collection School Of Computing and Information Systems

It is widely accepted that future digital library applications have to be built upon different kinds of database servers to draw upon different forms of data, including bibliographic, text, multimedia, and structured data. In this paper, the problem of integrating existing public bibliographic databases and structured databases which reside at different locations in the network is addressed. Although bibliographic data is semistructured, its attribute set is often determined by an international standard known as MARC. To unify bibliographic and structured data, the well-known SQL was extended to model bibliographic related attributes and queries. In particular, a new data type was …

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A Hypermedia Database To Manage World-Wide-Web Documents, Schubert Shou Boon Foo, Ee Peng Lim Jan 1997

A Hypermedia Database To Manage World-Wide-Web Documents, Schubert Shou Boon Foo, Ee Peng Lim

Research Collection School Of Computing and Information Systems

The surge of interest in the World-Wide-Web (WWW) with its potential commercial payoff has resulted in an explosion of information as organisations join in to publish and do business on the Internet. A related development, Intranet, which basically uses the same technology to build private corporate WWW-based networks, has emerged to provide cost-effective and efficient groupware and information management solutions for organisations. As a result, the Hyper Text Markup Language (HTML), used for constructing WWW documents, has become a contender for authoring future office documents. With this scenario, this study examines WWW practices and highlights the inadequacy and drawbacks of …

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Managing World Wide Web Publications, Schubert Foo, Ee Peng Lim Jan 1997

Managing World Wide Web Publications, Schubert Foo, Ee Peng Lim

Research Collection School Of Computing and Information Systems

The surge of interest in the World Wide Web (WWW), with its potential commercial payoff, has resulted in an explosion of information as organizations join in the fray to publish and do business on the Internet. In addition, Intranet, the private corporate WWW‐based network, has also emerged to provide cost‐effective and efficient groupware and information management solutions for organizations. As a result, the HyperText Markup Language used for constructing WWW documents has become a contender for authoring future office documents. Examines the current practices of WWW publishing and highlights its inadequacies and drawbacks. Demonstrates the need and advantages of using …

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Low-Degree Graph Partitioning Via Local Search With Applications To Constraint Satisfaction, Max Cut, And Coloring, Magnus M. Halldorsson, Hoong Chuin Lau Jan 1997

Low-Degree Graph Partitioning Via Local Search With Applications To Constraint Satisfaction, Max Cut, And Coloring, Magnus M. Halldorsson, Hoong Chuin Lau

Research Collection School Of Computing and Information Systems

We present practical algorithms for constructing partitions of graphs into a fixed number of vertex-disjoint subgraphs that satisfy particular degree constraints. We use this in particular to find k-cuts of graphs of maximum degree ∆ that cut at least a k - 1/k (1 + 1/2∆+k-1 ) fraction of the edges, improving previous bounds known. The partitions also apply to constraint networks, for which we give a tight analysis of natural local search heuristics for the maximum constraint satisfaction problem. These partitions also imply efficient approximations for several problems on weighted bounded-degree graphs. In particular, we improve the best performance …

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The Topology Dependence Of Charged Particle Multiplicities In Three-Jet Events, R. Barate, M. Thulasidas Jan 1997

The Topology Dependence Of Charged Particle Multiplicities In Three-Jet Events, R. Barate, M. Thulasidas

Research Collection School Of Computing and Information Systems

A study of individual jet and whole-event charged particle multiplicities in three-jet events measured in e + e − annihilation at the Z reveals a significant topology dependence. Mean jet multiplicities are inadequately described by jet energies; interjet angles must also be specified. Quantitative tests suggest that it is necessary to use transversemomentum- like scales to describe the data.

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A Study Of Τ Decays Involving Η And Ω Mesons, D. Buskulic, M. Thulasidas Jan 1997

A Study Of Τ Decays Involving Η And Ω Mesons, D. Buskulic, M. Thulasidas

Research Collection School Of Computing and Information Systems

The 132 pbt - 1 of data collected by ALEPH from 1991 to 1994 have been used to analyze η and ω production in τ decays. The following branching fractions have been measured: B(τ−→ντωh−)=(1.91±0.07±0.06)×10−2,B(τ−→ντωh−)=(1.91±0.07±0.06)×10−2, B(τ−→ντωh−π0)=(4.3±0.6±0.5)×10−3,B(τ−→ντωh−π0)=(4.3±0.6±0.5)×10−3, B(τ−→ντηK−)=(2.9+1.3−1.2±0.7)×10−4,B(τ−→ντηK−)=(2.9−1.2+1.3±0.7)×10−4, B(τ−→ντηh−π0)=(1.8±0.4±0.2)×10−3B(τ−→ντηh−π0)=(1.8±0.4±0.2)×10−3 and the 95% C.L. limit B(τ− → ντηπt -) t - 4 has been obtained. The ωπt- and ηπt -π0 rates and dynamics are found in agreement with the predictions made from e+e∼ - annihilation data with the help of isospin invariance (CVC).

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Production Of Orbitally Excited Charm Mesons In Semileptonic B Decays, D. Buskulic, M. Thulasidas Jan 1997

Production Of Orbitally Excited Charm Mesons In Semileptonic B Decays, D. Buskulic, M. Thulasidas

Research Collection School Of Computing and Information Systems

A sample of 3.6 million hadronic Z decays recorded between 1991 and 1995 with the ALEPH detector at LEP is used to investigate semileptonic decays of B mesons into final states involving orbitally excited charm mesons. Topological vertex criteria are used to search for decays involving narrow D** states as well as wide D** resonances and non-resonant D(*)π final states. The sum of the branching ratios for these processes is measured to be ${⤪ Br}({⩈erline {⤪ B}}⌝ghtarrow {⤪ D}≪ ⫑l^{-}{⩈erline v}) + {⤪ Br}({⩈erline {⤪ B}}⌝ghtarrow {⤪ D}^{⇒t}≪ ⫑l^{-}{⩈erline v})↦op =(2.26 pm 0.29({⤪ stat}) pm 0.33({⤪ syst}))%,$which accounts for a …

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Export Database Derivation Approach For Supporting Object-Oriented Wrapper Queries, Ee Peng Lim, Hon-Kuan Lee Dec 1996

Export Database Derivation Approach For Supporting Object-Oriented Wrapper Queries, Ee Peng Lim, Hon-Kuan Lee

Research Collection School Of Computing and Information Systems

Wrappers export the schema and data of existing heterogeneous databases and support queries on them. In the context of cooperative information systems, we present a flexible approach to specify the derivation of object-oriented (OO) export databases from local relational databases. Our export database derivation consists of a set of extent derivation structures (EDS) which defines the extent and deep extent of export classes. Having well-defined semantics, the EDS can be readily used in transforming wrapper queries to local queries. Based on the EDS, we developed a wrapper query evaluation strategy which handles OO queries on the export databases. The strategy …

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Democracies Really Are More Pacific (In General): Reexamining Regime Type And War Involvement, Kenneth Benoit Dec 1996

Democracies Really Are More Pacific (In General): Reexamining Regime Type And War Involvement, Kenneth Benoit

Research Collection School of Social Sciences

Current consensus in the field of democratic peace research holds that democratic states go to war in general no less than nondemocratic states. The author challenges this consensus by reevaluating the main empirical studies on which it rests, using information that previous studies ignored and statistical techniques unused or even unknown at the time. The results indicate that from 1960 to 1980, democratic nations were less involved in military conflict than other regime types. Estimates of this relationship are robust to different operational definitions of both war and democracy, to the addition of control variables for other possible correlates of …

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A Preview Of Ei And Ezi: Programs For Ecological Inference, Kenneth Benoit, Gary King Dec 1996

A Preview Of Ei And Ezi: Programs For Ecological Inference, Kenneth Benoit, Gary King

Research Collection School of Social Sciences

Ecological inference, as traditionally defined, is the process of using aggregate (i.e., ecological) data to infer discrete individual-level relationships of interest when individual-level data are not available. Existing methods of ecological inference generate very inaccurate conclusions about the empirical world- which thus gives rise to the ecological inference problem. Most scholars who analyze aggregate data routinely encounter some form of this problem. EI (by Gary King) and EzI (by Kenneth Benoit and Gary King) are freely available software that implement the statistical and graphical methods detailed in Gary King's book A Solution to the Ecological Inference Problem. These methods make …

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The Power Of Trust In Manufacturer-Retailer Relationships, Nirmalya Kumar Nov 1996

The Power Of Trust In Manufacturer-Retailer Relationships, Nirmalya Kumar

Research Collection Lee Kong Chian School Of Business

Manufacturers and retailers traditionally have seen each other as adversaries, but the benefits generated by trusting relationships between such old foes as Procter & Gamble Company and Wal-Mart Stores show that fear and intimidation may not be the most effective way for manufacturers and retailers to deal with each other after all. Studies of manufacturer-retailer relationships in a variety of industries reveal that exploiting power has three major drawbacks. it can come back to haunt a company if the balance of power changes; victims will ultimately seek ways to resist such exploitation; and working as partners allows retailers and manufacturers …

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Four-Fermion Production In E+E- Collisions At Centre-Of-Mass Energies Of 130 And 136 Gev, D. Buskulic, Manoj Thulasidas Nov 1996

Four-Fermion Production In E+E- Collisions At Centre-Of-Mass Energies Of 130 And 136 Gev, D. Buskulic, Manoj Thulasidas

Research Collection School Of Computing and Information Systems

Four-fermion events have been selected in a data sample of 5.8 pb−1 collected with the aleph detector at centre-of-mass energies of 130 and 136 GeV. The final states ℓ+ℓ−qq, ℓ+ℓ−ℓ+ℓ−, ννqq, and ννℓ+ℓ− have been examined. Five events are observed in the data, in agreement with the Standard Model predictions of 6.67±0.38 events from four-fermion processes and 0.14−0.05+0.19 from background processes.

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The Effects Of Trust And Interdependence On Relationship Commitment: A Trans-Atlantic Study, Inge Geyskens, Jan-Benedict E. M. Steenkamp, Lisa K. Scheer, Nirmalya Kumar Oct 1996

The Effects Of Trust And Interdependence On Relationship Commitment: A Trans-Atlantic Study, Inge Geyskens, Jan-Benedict E. M. Steenkamp, Lisa K. Scheer, Nirmalya Kumar

Research Collection Lee Kong Chian School Of Business

In recent years, interorganizational relationship management has become of paramount interest in marketing channels research. Marketing managers and researchers have identified mutual commitment among exchange partners in a marketing channel as central to successful relationship marketing and as key to producing significant benefits for firms. We consider two types of commitment that may characterize interfirm relationships. Affective commitment expresses the extent to which channel members like to maintain their relationship with specific partners. Calculative commitment measures the degree to which channel members experience the need to maintain a relationship. After conceptualizing commitment, we offer a set of hypotheses concerning the …

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Singapore And The Experience Of Place In Old Age, Lily Kong, Brenda S. A. Yeoh, Peggy Teo Oct 1996

Singapore And The Experience Of Place In Old Age, Lily Kong, Brenda S. A. Yeoh, Peggy Teo

Research Collection School of Social Sciences

Through case studies of two neighborhoods in Singapore with large concentrations of elderly residents-Tiong Bahru and Chinatown-we explore the relationship between the aged's emotional attachments to place and the sustenance of their personal identities, their continued participation in life, and their adaptation to changing circumstances. In particular, we examine their feelings of physical, social, and autobiographical insideness. We emphasize the rapidly changing physical conditions in Chinatown wrought by the government's conservation strategy and their implications for the elderly. In Tiong Bahru young people are moving to newer housing developments, leaving the aged behind in an essentially little-changed physical environment; we …

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Economic Development And The Distribution Of Land Rents In Singapore: A Georgist Implementation, Sock-Yong Phang Oct 1996

Economic Development And The Distribution Of Land Rents In Singapore: A Georgist Implementation, Sock-Yong Phang

Research Collection School Of Economics

Independent Singapore, which has a tradition of free trade, has implemented large doses of Henry George's prescriptions. It has successfully captured land rents for redistribution through its land acquisition, public housing and other programs. These policies have been instrumental in the successful economic development of the island city state. Industrial estates on state-owned land were leased to foreign multinationals for export-oriented manufacturing which created the bulk of jobs in the sector. Commercial developments are built by the program. Affordable 99-year leasehold housing, built by the state, provided added economic incentives for employment, and helped keep inflation and wages down. Private …

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Singapore's Experience With Car Quotas: Issues And Policy Processes, Sock-Yong Phang, Wing-Keung Wong, Ngee-Choon Chia Oct 1996

Singapore's Experience With Car Quotas: Issues And Policy Processes, Sock-Yong Phang, Wing-Keung Wong, Ngee-Choon Chia

Research Collection School Of Economics

This paper examines the policy processes behind Singapore's car quotas. The policy, when filtered through the market mechanism, had a number of unintended consequences. The public's unhappiness with certain features and [`]loopholes' of the system resulted in many changes to the rules. The effects of recent measures to curb speculation on quota premiums are evaluated. Problems with Singapore's Weekend Car Scheme are also discussed. The lesson for transport policy makers elsewhere is that in attempting to deal with the road congestion problem through car ownership policies, an asset market for vehicles should be taken into account.

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An Evidential Reasoning Approach To Attribute Value Conflict Resolution In Database Integration, Ee Peng Lim, Jaideep Srivastava, Shashi Shekhar Oct 1996

An Evidential Reasoning Approach To Attribute Value Conflict Resolution In Database Integration, Ee Peng Lim, Jaideep Srivastava, Shashi Shekhar

Research Collection School Of Computing and Information Systems

Resolving domain incompatibility among independently developed databases often involves uncertain information. DeMichiel [1] showed that uncertain information can be generated by the mapping of conflicting attributes to a common domain, based on some domain knowledge. In this paper, we show that uncertain information can also arise when the database integration process requires information not directly represented in the component databases, but can be obtained through some summary of data. We therefore propose an extended relational model based on Dempster-Shafer theory of evidence [2] to incorporate such uncertain knowledge about the source databases. The extended relation uses evidence sets to represent …

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Resource-Constrained Project Scheduling: A Survey Of Recent Developments, Willy Herroelen, Erik Demeulemeester, Bert De Reyck Sep 1996

Resource-Constrained Project Scheduling: A Survey Of Recent Developments, Willy Herroelen, Erik Demeulemeester, Bert De Reyck

Research Collection Lee Kong Chian School Of Business

Resource-constrained project scheduling involves the scheduling of project activities subject to precedence and resource constraints in order to meet the objective(s) in the best possible way. The area covers a wide variety of problem types. The objective of this paper is to provide a survey of what we believe are the important recent developments in the area. Our main focus will be on the recent progress made in and the encouraging computational experience gained with the use of optimal solution procedures for the basic resource-constrained project scheduling problem (RCPSP) and important extensions. We illustrate how the branching rules, dominance and …

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