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A Survey Of Expert Systems In Singapore And The Integration Of Multimedia Technology And Expert Systems, Arcot Desai Narasimhalu Aug 1993

A Survey Of Expert Systems In Singapore And The Integration Of Multimedia Technology And Expert Systems, Arcot Desai Narasimhalu

Research Collection School Of Computing and Information Systems

Expert systems technologies have been widely adopted by different industries form the early 1980s. There have been examples of expert systems embedded in applications developed for the financial and banking sector, manufacturing, services and government. In section 2 of this paper, we present a scan of expert systems used in different sectors. Section 3 will cover the expert system tools and applications developed in the decade of the 1980s. Section 4 will present some of the ongoing expert systems related activities. Section 5 will extrapolate the present work to forecast the future types of expert systems that might be developed …

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Memory-Adaptive External Sorting, Hwee Hwa Pang, Michael J. Carey, Miron Livny Aug 1993

Memory-Adaptive External Sorting, Hwee Hwa Pang, Michael J. Carey, Miron Livny

Research Collection School Of Computing and Information Systems

In real-time and goal-oriented database systems, the amount of memory assigned to queries that sort or join large relations may fluctuate due to contention from other higher priority transactions. This study focuses on techniques that enable external sorts both to reduce their buffer usage when they lose memory, and to effectively utilize any additional buffers that are given to them. We also show how these techniques can be extended to work with sort-merge joins. A series of experiments confirms that our proposed techniques are useful for sorting and joining large relations in the face of memory fluctuations.

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Urban Constraints, Political Imperatives: Environmental 'Design' In Singapore, Victor R. Savage, Lily Kong Aug 1993

Urban Constraints, Political Imperatives: Environmental 'Design' In Singapore, Victor R. Savage, Lily Kong

Research Collection School of Social Sciences

What lies at the heart of the continuing efforts at social education and engineering? We argue that they stem from a political elite which recognises the constraints facing Singapore and the need to deal with them at national level. Specifically, the government in Singapore has recognised the spatial constraints of an island-state and the dangers of a burgeoning population, particularly in relation to the need to sustain a viable urban ecosystem. They have therefore been conscientious in planning and population control. They have also stressed the importance of remaining economically viable in order to survive and an entire survival and …

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Performance Analysis Of Two Bridged Csma/Cd Networks, C. C. Ko, W. C. Wang, J. L. Du, Robert H. Deng, K. M. Lye Aug 1993

Performance Analysis Of Two Bridged Csma/Cd Networks, C. C. Ko, W. C. Wang, J. L. Du, Robert H. Deng, K. M. Lye

Research Collection School Of Computing and Information Systems

This paper analyses the performance of two non-persistent CSMA/CD LANs linked by a bridge. The main function of the bridge is to buffer all internet work packets and forward them across networks to their destinations. From establishing and solving the main equations governing the behaviour of the bridged networks, the effects of design parameters such as the bridge buffer size and re-transmission back off delay on the performance of the system are studied. It is shown that if these parameters are chosen properly, better throughput and delay performance can be obtained, when compared with an equivalent CSMA/CD network without using …

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Performance Of A Token-Passing System With Batch Arrivals And Its Application To File Transfers, Robert H. Deng, Xuanyu Zhang, Kuan Tase Huang Jul 1993

Performance Of A Token-Passing System With Batch Arrivals And Its Application To File Transfers, Robert H. Deng, Xuanyu Zhang, Kuan Tase Huang

Research Collection School Of Computing and Information Systems

This paper investigates the performance of token-passing systems with limited service and Poisson arrivals. For pure Poisson arrivals, the Laplace-Stieltjes Transform (LST) of an approximate customer/packet waiting time distribution is derived and expressed as a functional equation, from which the approximate mean and variance of waiting time are obtained; for batch Poisson arrivals, an approximate mean of waiting time is derived. Mean waiting time approximations are compared against both simulation results and other results presented in the literature; the variance approximation is evaluated by comparing it to simulation results only, since no other results on variance have been reported so …

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Performance Analysis Of Interconnected Lans With Server/Client Configuration, Jiangling Du, Robert H. Deng, Chi Chung Ko Jul 1993

Performance Analysis Of Interconnected Lans With Server/Client Configuration, Jiangling Du, Robert H. Deng, Chi Chung Ko

Research Collection School Of Computing and Information Systems

In this paper, we study the end-to-end performance of interconnected local area networks (LAN) with server/client configuration. The system uses bridges to connect two token-ring LANs through a high-speed communication link. A server station located on one LAN receives requests from client-stations on the same LAN as well as on the remote LAN, processes the requests, and returns responses to the client-stations. The end-to-end connections of the interconnected network are modelled as single-chain and multiple-chain closed queueing systems, which are solved by an iterative algorithm based on the MVA (mean value analysis) method. The performance examples are shown in terms …

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Partially Preemptible Hash Joins, Hwee Hwa Pang, Michael J. Carey, Miron Livny May 1993

Partially Preemptible Hash Joins, Hwee Hwa Pang, Michael J. Carey, Miron Livny

Research Collection School Of Computing and Information Systems

With the advent of real-time and goal-oriented database systems, priority scheduling is likely to be an important feature in future database management systems. A consequence of priority scheduling is that a transaction may lose its buffers to higher-priority transactions, and may be given additional memory when transactions leave the system. Due to their heavy reliance on main memory, hash joins are especially vulnerable to fluctuations in memory availability. Previous studies have proposed modifications to the hash join algorithm to cope with these fluctuations, but the proposed algorithms have not been extensively evaluated or compared with each other. This paper contains …

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Federated Autonomous Databases: Project Overview, Satya Prabhakar, Jiandong Huang, James Richardson, Jaideep Srivastava, Ee Peng Lim, Sham Navathe, Ashok Savarase, Mark Foresti Apr 1993

Federated Autonomous Databases: Project Overview, Satya Prabhakar, Jiandong Huang, James Richardson, Jaideep Srivastava, Ee Peng Lim, Sham Navathe, Ashok Savarase, Mark Foresti

Research Collection School Of Computing and Information Systems

The paper presents an overview of an ongoing research program, Federated Autonomous Databases, sponsored by Rome Laboratory (US Air Force) and conducted by Honeywell in collaboration with the University of Minnesota and Georgia Institute of Technology. This program is exploratory in nature and is aimed at understanding and solving, within the scope of the program definition, the problem of providing integrated access to distributed, heterogeneous and autonomous databases.

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Book Review: Taoist Mystical Philosophy: The Scripture Of Western Ascension By Livia Kohn, Alan Kam Leung Chan Apr 1993

Book Review: Taoist Mystical Philosophy: The Scripture Of Western Ascension By Livia Kohn, Alan Kam Leung Chan

Research Collection College of Integrative Studies

Livia Kohn's book is a work of considerable scholarship. It offers much more than an analysis of an early Taoist scripture. Not only does it present a careful reading and translation of the Xisheng jing (Scripture of Western Ascension), but it also provides significant insights into the rela- tionship between "Philosophical Taoism" and "Religious Taoism," the nature and development of Taoist mystical philosophy, and the socio- political and intellectual context, the concrete "life-world," of Taoism in early medieval China.

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Entity Identification In Database Integration, Ee Peng Lim, Jaideep Srivastava, Satya Prabhakar, James Richardson Apr 1993

Entity Identification In Database Integration, Ee Peng Lim, Jaideep Srivastava, Satya Prabhakar, James Richardson

Research Collection School Of Computing and Information Systems

The objective of entity identification is to determine the correspondence between object instances from more than one database. Entity identification at the instance level, assuming that schema level heterogeneity has been resolved a priori, is examined. Soundness and completeness are defined as the desired properties of any entity identification technique. To achieve soundness, a set of identity and distinctness rules are established for entities in the integrated world. The use of extended key, which is the union of keys, and possibly other attributes, from the relations to be matched, and its corresponding identify rule are proposed to determine the equivalence …

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Ideological Hegemony And The Political Symbolism Of Religious Buildings In Singapore, Lily Kong Feb 1993

Ideological Hegemony And The Political Symbolism Of Religious Buildings In Singapore, Lily Kong

Research Collection School of Social Sciences

Cultural geographers have for too long ignored the association between the 'religious' and the 'political', concentrating instead on separating the 'religious' from the sociopolitical and economic forces in society. The challenge is taken up in this paper in an analysis of the contemporary meanings and values of religious buildings in Singapore as invested by the state. Attention is paid to the state's conceptions of religion and religious space and the roles it plays in influencing such space. The ways in which, through its various roles, the state in Singapore plays a significant part in influencing context and hence in shaping …

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Observation Of B0 Decay To Two Charmless Mesons, M. Battle, Manoj Thulasidas Jan 1993

Observation Of B0 Decay To Two Charmless Mesons, M. Battle, Manoj Thulasidas

Research Collection School Of Computing and Information Systems

We report results from a search for the decays B0→π+π-, B0→K+π-, and B0→K+K-. We find 90% confidence level upper limits on the branching fractions, Bππ

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Evidence For Penguin-Diagram Decays: First Observation Of B→K*(892)Γ, R. Ammar, M. Thulasidas Jan 1993

Evidence For Penguin-Diagram Decays: First Observation Of B→K*(892)Γ, R. Ammar, M. Thulasidas

Research Collection School Of Computing and Information Systems

We have observed the decays B0→K*(892)0γ and B−→K*(892)−γ, which are evidence for the quark-level process b→sγ. The average branching fraction is (4.5±1.5±0.9)×10−5. This value is consistent with standard model predictions from electromagnetic penguin diagrams.

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Repository Evaluation Of Software Reuse: An Empirical Study, R. D. Banker, Robert J. Kauffman, D. Zweig Jan 1993

Repository Evaluation Of Software Reuse: An Empirical Study, R. D. Banker, Robert J. Kauffman, D. Zweig

Research Collection School Of Computing and Information Systems

The use and benefits of repository evaluation of software reuse are illustrated through an analysis of the evolving repositories of two large firms that recently implemented integrated CASE development tools. The analysis shows that these tools have supported high levels of software reuse, but it also suggests that there remains considerable unexploited reuse potential. The findings indicate that organizational changes will be required before the full potential of the new technology can be realized.

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A Rule-Based System For Query Feedback, Hock C. Chan, Kwok-Kee Wei, Keng Siau Jan 1993

A Rule-Based System For Query Feedback, Hock C. Chan, Kwok-Kee Wei, Keng Siau

Research Collection School Of Computing and Information Systems

The authors propose a rule-based system which provides feedback in order to give the user a better understanding of the user's queries. This technique improves query accuracy and confidence. A rule-based expert system that pinpoints syntax errors is described. It suggests possible semantics errors and provides possible solutions, as well as the English translation for the queries. The system can be used for computer-aided training and in actual operations. The system was experimentally tested with a group of students.

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Liberty, Chandran Kukathas Jan 1993

Liberty, Chandran Kukathas

Research Collection School of Social Sciences

Such is the rhetorical appeal of the idea of liberty that a variety of political philosophiesclaim to honour it. Republicans and Marxists, no less than libertarians and liberals,maintain that they and they alone are the true defenders of freedom. The literature ofcontemporary political theory is thus replete with rival analyses of the meaning ofliberty, and disputes about its measurement, distribution and institutional requirements. Our aim here is to gain some understanding of the meaning and the conditionsof liberty by working through the thicket of contemporary argument, though we mayhave to rest content with a better knowledge of the terrain.

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Tau Decays With One Charged Particle Plus Multiple Π0'S, M. Procario, Manoj Thulasidas Jan 1993

Tau Decays With One Charged Particle Plus Multiple Π0'S, M. Procario, Manoj Thulasidas

Research Collection School Of Computing and Information Systems

With the CLEO-II detector at the Cornell Electron Storage Ring, we have measured branching fractions for tau lepton decay into one-prong final states with multiple π0’s B0hnπ, normalized to the branching fraction for tau decay into one charged particle and a single π0. We find B0h2π/B0hπ=0.345±0.006±0.016, B0h3π/B0hπ=0.041 ±0.003±0.005, and B0h4π/B0hπ=0.006±0.002±0.002.

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Measurement Of Charmless Semileptonic Decays Of B Mesons, Bartelt; J.; Et Al., M. Thulasidas Jan 1993

Measurement Of Charmless Semileptonic Decays Of B Mesons, Bartelt; J.; Et Al., M. Thulasidas

Research Collection School Of Computing and Information Systems

No abstract provided.

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Observation Of The Charmed Baryon C+ And Measurement Of The Isospin Mass Splittings Of The C, Crawford, G.; Et Al., M. Thulasidas Jan 1993

Observation Of The Charmed Baryon C+ And Measurement Of The Isospin Mass Splittings Of The C, Crawford, G.; Et Al., M. Thulasidas

Research Collection School Of Computing and Information Systems

No abstract provided.

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Search For Τ-→Γμ-: A Test Of Lepton Number Conservation, A. Bean, M. Thulasidas Jan 1993

Search For Τ-→Γμ-: A Test Of Lepton Number Conservation, A. Bean, M. Thulasidas

Research Collection School Of Computing and Information Systems

A search for the lepton mumber violating decay of the τ lepton to the γμ final state has been performed with the CLEO II detector at the Cornell e+e− storage ring CESR. In a data sample that corresponds to an integrated luminosity of 1.55 fb−1, we observe no candidates in the signal region. We thus determine an upper limit of B(τ−→γμ−)

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Study Of D0 Decays Into K̄0 And K̄*0, M. Procario, M. Thulasidas Jan 1993

Study Of D0 Decays Into K̄0 And K̄*0, M. Procario, M. Thulasidas

Research Collection School Of Computing and Information Systems

Using the CLEO II detector at CESR we have studied D0 decays into final states with a ¯K0 or ¯K*0, and have measured branching ratios for the decay modes D0→(¯K0¯K*0)π0, η, η′. These results are compared with predictions of various charm decay models, and contributions of final-state interactions are discussed.

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Gender, Ideology, Nation: Judou In The Cultural Politics Of China, William A. Callahan Jan 1993

Gender, Ideology, Nation: Judou In The Cultural Politics Of China, William A. Callahan

Research Collection School of Social Sciences

ONE DAY IN February 1991 a Chinese film previously noted mostly for its radical use of color - Ju Dou - became an international political event. Politics and culture (once again) became intimately intertwined as China was honored with its first Oscar nomination at the same time that China was castigated for trying to censor this film, and hence control representations of "China."

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A Case Tool For Conceptual Database Design, Keng Siau, Kok Phuang Tan, Hock Chuan Chan Dec 1992

A Case Tool For Conceptual Database Design, Keng Siau, Kok Phuang Tan, Hock Chuan Chan

Research Collection School Of Computing and Information Systems

The paper describes a Computer Aided Software Engineering (CASE) tool to support conceptual database modelling. One popular approach for conceptual database modelling is use of the Entity-Relationship (ER) model. The paper proposes the use of an Enhanced Entity-Relationship (EER) model for conceptual database modelling. This Enhanced Entity-Relationship model extends the Entity-Relationship model by incorporating the generalization/specialization, aggregation and categorization abstractions. The CASE tool, which is based on the Enhanced Entity-Relationship model, is known as the Enhanced Entity-Relationship Diagrammer (EERD). In addition, the CASE tool supports direct visual query and update based on the EERM.

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A Participants' Dss For A Management Game With A Dss Generator, G. K. Yeo, Fiona Fui-Hoon Nah Sep 1992

A Participants' Dss For A Management Game With A Dss Generator, G. K. Yeo, Fiona Fui-Hoon Nah

Research Collection School Of Computing and Information Systems

A decision support system for a management game has been built with emphasis on total model integration, easy database access, and efficient model building by participants themselves. A decision-support-system generator has been used to provide a wide range of modeling capabilities. This article describes its design principles and major features.

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Belief-In And Belief In God, John N. Williams Sep 1992

Belief-In And Belief In God, John N. Williams

Research Collection School of Social Sciences

Of all the examples of ‘belief-in’, belief in God is both the most mysterious and the most challenging. Indeed whether and how an apologist can make a case for the intellectual respectability of theistic belief, depends upon the nature of this ‘belief-in’. I shall attempt to elucidate this matter by an analysis of the relation of ‘belief-in’ to ‘belief-that’ and by treating belief in God as a special case of ‘belief-in’.

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Deterministic Approximations To Co-Production Problems With Service Constraints And Random Yields, Gabriel R. Bitran, Thin Yin Leong May 1992

Deterministic Approximations To Co-Production Problems With Service Constraints And Random Yields, Gabriel R. Bitran, Thin Yin Leong

Research Collection School Of Computing and Information Systems

Production planning problems where multiple item categories are produced simultaneously are examined. The items have random yields and are used to satisfy the demands of many products. These products have specification requirements that overlap. An item originally targeted to satisfy the demand of one product may be used to satisfy the demand of other products when it conforms to their specifications. Customers' demand must be satisfied from inventory. The problem is formulated with service constraints and a near-optimal solution is provided to the problem with a fixed planning horizon. Simple heuristics are proposed for the problem solved with a rolling …

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Australian Academic Legal Information Centres: Issues For The Law Library Of 2001, Elizabeth Naumczyk Jan 1992

Australian Academic Legal Information Centres: Issues For The Law Library Of 2001, Elizabeth Naumczyk

Research Collection Library

By the year 2001, Australian academic law libraries will face different challenges than those of today, especially as an increase in library users and a growth in the volume of legal literature can be confidently predicted. The question is to identify these challenges and to define ways to deal with them. Already, academic libraries with limited and decreasing funds, and under-resourced law schools in Australia, are having difficulty coping with the costs of running law libraries in their present form. A central issue will be the availability of funds to cope with given changes, including how to redirect these funds …

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Query Optimization In Oodb, Hwee Hwa Pang, Hongjun Lu, Beng Chin Ooi Jan 1992

Query Optimization In Oodb, Hwee Hwa Pang, Hongjun Lu, Beng Chin Ooi

Research Collection School Of Computing and Information Systems

In object-oriented databases, relationships are generally maintained explicitly. The partial result of a retrieved object can be used to efficiently retrieve related objects. Instead of optimizing joins as in relational database systems, pointer chasing is optimized in object-oriented database systems. Further, semantics inherent in the object-oriented database, like superclass-subclass relationships and composite-component relationships between object classes, must be realised. In this paper, we describe our initial result in query optimization in an object-oriented database system. Semantic query transformation is used to preprocess the query. semantically optimized query is then translated into a query evaluation plan which comprises method invocations that …

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Electronic Branching Ratio Of The Lepton, R. Ammar, Manoj Thulasidas Jan 1992

Electronic Branching Ratio Of The Lepton, R. Ammar, Manoj Thulasidas

Research Collection School Of Computing and Information Systems

Using data accumulated by the CLEO I detector operating at the Cornell Electron Storage Ring, we have measured the ratio R=Γ(τ→eν¯eντ)Γ1 where Γ1 is the τ decay rate to final states with one charged particle. We find R=0.2231±0.0044±0.0073 where the first error is statistical and the second is systematic. Together with the measured topological one-charged-particle branching fraction, this yields the branching fraction of the τ lepton to electrons, Be=0.192±0.004±0.006.

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Isospin Mass Splittings From Precision Measurements Of D*-D Mass Differences, D. Bortoletto, Manoj Thulasidas Jan 1992

Isospin Mass Splittings From Precision Measurements Of D*-D Mass Differences, D. Bortoletto, Manoj Thulasidas

Research Collection School Of Computing and Information Systems

Using the decay modes, D*+→D+π0 and D*0→D0π0, we have measured the D*+−D+ and D*0−D0 mass differences to be 140±0.08±0.06 and 142.12±0.05±0.05 MeV, respectively. Combining these measurements with the Particle Data Group average for the D*+−D0 mass difference, we obtain isospin mass splittings for D*+−Dusp*0 and D+−D0 of 3.32±0.08±0.05 and 4.80±0.10 ±0.06 MeV. We discuss the implications of these measurements for models of isospin mass differences and model-dependent estimates of fD.

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