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Articles 21391 - 21420 of 23193
Full-Text Articles in Entire DC Network
L S Penrose's Limit Theorem: Tests By Simulation, Pao-Li Chang, Vincent Chua, Moshe Machover
L S Penrose's Limit Theorem: Tests By Simulation, Pao-Li Chang, Vincent Chua, Moshe Machover
Research Collection School Of Economics
LS Penrose’s limit theorem (PLT) – which is implicit in Penrose [5, p. 72] and for which he gave no rigorous proof – says that, in simple weighted voting games, if the number of voters increases indefinitely while existing voters retain their weights and the relative quota is pegged, then – under certain conditions – the ratio between the voting powers of any two voters converges to the ratio between their weights. Lindner and Machover [3] prove some special cases of PLT; and conjecture that the theorem holds, under rather general conditions, for large classes of weighted voting games, various …
Analytically Calibrated Box-Cox Percentile Limits For Duration And Event-Time Models, Zhenlin Yang, Albert K.C. Tsui
Analytically Calibrated Box-Cox Percentile Limits For Duration And Event-Time Models, Zhenlin Yang, Albert K.C. Tsui
Research Collection School Of Economics
This paper proposes a unified approach to constructing confidence limits for a future percentile duration or event-time. The construction is based on an analytical calibration of the Box-Cox-type “plug-in” percentile limits (PL). The performance of the calibrated Box-Cox PL is investigated using Monte Carlo experiments. Comparisons are made with PLs that are specifically designed for a particular distribution such as Weibull and lognormal. Excellent performances of the calibrated Box-Cox PL are observed. Simulation based on other popular duration models such as gamma and inverse Gaussian reveal that the proposed PL is robust against distributional assumptions and that it performs much …
Investing In Real Estate: Mortgage Financing Practices And Optimal Holding Period, Winston T. H. Koh, Edward H. K. Ng
Investing In Real Estate: Mortgage Financing Practices And Optimal Holding Period, Winston T. H. Koh, Edward H. K. Ng
Research Collection School Of Economics
Real estate investments are typically characterized by high degrees of leverage and long-loan tenures. In perfect capital markets, leverage has no impact on the investment decision apart from tax considerations. However, the mortgage financing market is imperfect in many countries. In the presence of market imperfections, an optimal holding period exists for real property investments. We provide a simple rule to calculate the optimal holding period to compare the required rate of return with the leveraged rate of return on equity.
U-Commerce: Emerging Trends And Research Issues, H. Galanxhi-Janaqi, Fiona Fui-Hoon Nah
U-Commerce: Emerging Trends And Research Issues, H. Galanxhi-Janaqi, Fiona Fui-Hoon Nah
Research Collection School Of Computing and Information Systems
Ubiquitous commerce or u-commerce is the combination of traditional e-commerce and wireless, television, voice and silent commerce. U-commerce implies ubiquity, universality, uniqueness and unison. It is not a replacement for other types of commerce, but an extension of them. While bringing many benefits, there are challenges and impediments to overcome. Research is needed to assess the value of u-commerce and to address its related issues and challenges. Questions that need to be addressed are: What is the value of u-commerce? What are the ways to maximize the benefits and value of u-commerce? Is it the right technology and what directions …
Vertical Sensitivity For The Information Security Health Rating Of Enterprises, Arcot Desai Narasimhalu, Nagarajan Dayasindhu, Raghavan Subramanian
Vertical Sensitivity For The Information Security Health Rating Of Enterprises, Arcot Desai Narasimhalu, Nagarajan Dayasindhu, Raghavan Subramanian
Research Collection School Of Computing and Information Systems
INFOSeMM Maturity model was developed jointly by SMU and Infosys. It is recognized that different industry verticals will have different levels of recommended maturity levels. This paper articulates the need for developing the industry vertical benchmarks.
Method For Identifying Individuals, Manoj Thulasidas
Method For Identifying Individuals, Manoj Thulasidas
Research Collection School Of Computing and Information Systems
A method and system for identifying a subject comprises obtaining a digitised recording of an electrocardiogram measurement of the subject to be identified, the digitised recording being a cyclic waveform having a peak amplitude. The digitised recording is normalised to reduce variations due to physiological effects, and the normalised recording is processed to determine a feature vector in the frequency domain. The distance between the determined feature vector and a predetermined feature vector is measured to identify the subject.
Factors Impacting E-Government Development, Keng Siau, Y. Long
Factors Impacting E-Government Development, Keng Siau, Y. Long
Research Collection School Of Computing and Information Systems
E-government is a way for governments to use new technologies such as the Internet to provide citizens with more convenient access to government information and services, to improve the quality of services, and to provide greater opportunities for citizens to participate in democratic institutions and processes. This research investigates factors impacting e-government development. Based on the growth theory and human capital theory from the economics literature, we hypothesize that information and computer technology, and human development are two factors impacting e-government development. The hypotheses were empirically tested using secondary data from the United Nations and the United Nations Development Programme. …
Easing The Inferential Leap In Competency Modeling: The Effects Of Task-Related Information And Subject Matter Expertise, Filip Lievens, Juan I. Sanchez, Wilfred De Corte
Easing The Inferential Leap In Competency Modeling: The Effects Of Task-Related Information And Subject Matter Expertise, Filip Lievens, Juan I. Sanchez, Wilfred De Corte
Research Collection Lee Kong Chian School Of Business
Despite the rising popularity of the practice of competency modeling, research on competency modeling has lagged behind. This study begins to close this practice-science gap through 3 studies (1 lab study and 2 field studies), which employ generalizability analysis to shed light on (a) the quality of inferences made in competency modeling and (b) the effects of incorporating elements of traditional job analysis into competency modeling to raise the quality of competency inferences. Study 1 showed that competency modeling resulted in poor interrater reliability and poor between-job discriminant validity amongst inexperienced raters. In contrast, Study 2 suggested that the quality …
Investing When Volatility Fluctuates, Leping Wang
Investing When Volatility Fluctuates, Leping Wang
Research Collection Lee Kong Chian School Of Business
No abstract provided.
Penny Pricing And The Components Of Spread And Depth Changes, David K. Ding, K.H. Chuang, C. Chearoenwong
Penny Pricing And The Components Of Spread And Depth Changes, David K. Ding, K.H. Chuang, C. Chearoenwong
Research Collection Lee Kong Chian School Of Business
Recent studies show that decimal pricing led to significant reductions in the spread and depth on the NYSE. In this paper, we examine how the observed changes in the spread and depth can be attributed to different factors. We show that stocks with higher proportions of one-tick spreads and odd-sixteenth quotes, and more frequent trading before decimalization experienced larger declines in the spread and depth afterwards. We interpret this result as evidence of reduced binding constraints and increased price competition under decimal pricing. We also find that decimal pricing led to nontrivial changes in select stock attributes, and that these …
Free Will's A Gamble, Seow Hon Tan
Free Will's A Gamble, Seow Hon Tan
Research Collection Yong Pung How School Of Law
The debate over whether Singapore should have a casino has turned from the contest between moral values and social repercussions, on the one hand, and economic values on the other, to whether Singaporeans can be trusted to act responsibly. Put another way, the issue now seems to be whether the approach should be paternalistic, with all its connotations of the nanny state protecting the individual from himself.
True Believers Or Moral Absolutists, Seow Hon Tan
True Believers Or Moral Absolutists, Seow Hon Tan
Research Collection Yong Pung How School Of Law
The recent American presidential elections brought to the fore the question of what place moral values have in public decision-making when traditional moral values are not espoused by all in a pluralist society. Even if traditional values - seen as absolutist - are imposed on others through a democratic electoral process, that imposition, particularly in hot button issues like abortion and same-sex marriage, remains difficult to accept.
Organizational Politics And Multisource Feedback: An Opportunity Or A Threat?, Gary J. Greguras, John M. Ford
Organizational Politics And Multisource Feedback: An Opportunity Or A Threat?, Gary J. Greguras, John M. Ford
Research Collection Lee Kong Chian School Of Business
No abstract provided.
Editorial: Enhancing Teaching Performance: Managing Student Feedback Exercises, Lily Kong
Editorial: Enhancing Teaching Performance: Managing Student Feedback Exercises, Lily Kong
Research Collection School of Social Sciences
When I was an undergraduate at the National University of Singapore (NUS) in the mid-1980s, student feedback exercises were introduced. They were manually conducted via pen-and-paper mode, with administrative staff taking about 10±15 minutes at the start of a lecture class every day in a designated week (usually the last or penultimate week of semester), distributing questionnaires and collecting the completed forms in boxes to have the responses scanned and totted up. This represented the ®rst time that a systematic data collection and feedback mechanism was instituted for students. Since then, various innovations have been introduced to manage student feedback …
Two-Echelon Repairable Item Inventory System With Limited Repair Capacity Under Nonstationary Demands, Hoong Chuin Lau, Huawei Song
Two-Echelon Repairable Item Inventory System With Limited Repair Capacity Under Nonstationary Demands, Hoong Chuin Lau, Huawei Song
Research Collection School Of Computing and Information Systems
We study a repairable item inventory system under limited repair capacity and nonstationary Poisson demands, motivated by corrective maintenance of military equipment. Our goal is to minimize the cost of both spare and repair resource allocation. We propose an efficient analytical model that combines optimization modeling and queuing theory.
Corrective Maintenance Optimization In An Air Force, Hoong Chuin Lau, K. Y. Neo, W. C. Wan
Corrective Maintenance Optimization In An Air Force, Hoong Chuin Lau, K. Y. Neo, W. C. Wan
Research Collection School Of Computing and Information Systems
Successful military mission planning and execution depend critically on equipment serviceability and resupply. Due to the stochastic nature of demands, the forecast of optimal spares and resources needed to guarantee the level of serviceability is a complex problem, especially in a multi-echelon setting. In this paper, we propose a decision-support concept and software tool known as Corrective Maintenance Optimizer (CMO) that helps to optimize system availability, through proper allocation of spare parts, both strategically and operationally.
Job Scheduling With Unfixed Availability Constraints, Hoong Chuin Lau, C. Zhang
Job Scheduling With Unfixed Availability Constraints, Hoong Chuin Lau, C. Zhang
Research Collection School Of Computing and Information Systems
Standard scheduling theory assumes that all machines are continuously available throughout the planning horizon. In many manufacturing and service management situations however, machines need to be maintained periodically to prevent malfunctions. During the maintenance period, a machine is not available for processing jobs. Hence, a more realistic scheduling model should take into account machine maintenance activities. In this paper, we study the problem of job scheduling with unfixed availability constraints on a single machine. We first propose a preliminary classification for the scheduling problem with unfixed availability constraints based on maintenance constraints, job characteristics and objective function. We divide our …
Finding Constrained Frequent Episodes Using Minimal Occurrences, Xi Ma, Hwee Hwa Pang, Kian-Lee Tan
Finding Constrained Frequent Episodes Using Minimal Occurrences, Xi Ma, Hwee Hwa Pang, Kian-Lee Tan
Research Collection School Of Computing and Information Systems
Recurrent combinations of events within an event sequence, known as episodes, often reveal useful information. Most of the proposed episode mining algorithms adopt an apriori-like approach that generates candidates and then calculates their support levels. Obviously, such an approach is computationally expensive. Moreover, those algorithms are capable of handling only a limited range of constraints. In this paper, we introduce two mining algorithms - episode prefix tree (EPT) and position pairs set (PPS) - based on a prefix-growth approach to overcome the above limitations. Both algorithms push constraints systematically into the mining process. Performance study shows that the proposed algorithms …
Accommodating Instance Heterogeneities In Database Integration, Ee Peng Lim, Roger Hsiang-Li Chiang
Accommodating Instance Heterogeneities In Database Integration, Ee Peng Lim, Roger Hsiang-Li Chiang
Research Collection School Of Computing and Information Systems
A complete data integration solution can be viewed as an iterative process that consists of three phases, namely analysis, derivation and evolution. The entire process is similar to a software development process with the target application being the derivation rules for the integrated databases. In many cases, data integration requires several iterations of refining the local-to-global database mapping rules before a stable set of rules can be obtained. In particular, the mapping rules, as well as the data model and query model for the integrated databases have to cope with poor data quality in local databases, ongoing local database updates …
A Periodic-Review Inventory Model With Application To The Continuous-Review Obsolescence Problem, Yuyue Song, Hoong Chuin Lau
A Periodic-Review Inventory Model With Application To The Continuous-Review Obsolescence Problem, Yuyue Song, Hoong Chuin Lau
Research Collection School Of Computing and Information Systems
In this paper we consider a stochastic-demand periodic-review inventory model with sudden obsolescence. We characterize the structure of the optimal policy and propose a dynamic programming algorithm for computing its parameters. We then utilize this algorithm to approximate the solution to the continuous-review sudden obsolescence problem with general obsolescence distribution. We prove convergence of our approximation scheme, and demonstrate it numerically against known closed-form solutions of special cases.
The Changing Political Economy Of Party Membership, Riccardo Pelizzo
The Changing Political Economy Of Party Membership, Riccardo Pelizzo
Research Collection School of Social Sciences
A recent survey conducted in a sample of 83 countries by the Inter-Parliamentary Union in collaboration with the World Bank Institute on the “Relations between the Legislature and the Executive in the Context of Parliamentary Oversight” allows cross-national comparison for the role of legislatures in the budgetary process. One of the survey’s most significant indications is that legislatures in presidential systems are generally more involved in the preparation of the budget than legislatures in either parliamentary or semi-presidential systems. The picture, however, is very different when we look at legislatures’ oversight of the budget. Parliaments are generally more involved in …
Style Effects In The Cross-Section Of Stock Returns, Melvyn Teo, Sung-Jun Woo
Style Effects In The Cross-Section Of Stock Returns, Melvyn Teo, Sung-Jun Woo
Research Collection Lee Kong Chian School Of Business
Using CRSP stock and mutual fund data, we find strong evidence for reversals at the style level (e.g., large value, small growth, etc.). There are significant excess and risk-adjusted returns for stocks in styles characterized by the worst past returns and net inflows. We also find evidence for momentum and positive feedback trading at the style level. These value and momentum effects are driven neither by fundamental risk nor by stock-level reversals and momentum. Taken together, the results are consistent with the style-level positive feedback trading model of Barberis and Shleifer (2003).
The Relationship Between Governance Structure And Risk Management Approaches In Japanese Venture Capital Firms, Toru Yoshikawa, Phillip H. Phan, Jonathan Linton
The Relationship Between Governance Structure And Risk Management Approaches In Japanese Venture Capital Firms, Toru Yoshikawa, Phillip H. Phan, Jonathan Linton
Research Collection Lee Kong Chian School Of Business
This paper attempts to understand what drives Japanese venture capital (JVC) fund managers to select either active managerial monitoring or portfolio diversification to manage their firms' investment risks [J. Bus. Venturing 4 (1989) 231]. Unlike U.S. venture capitalists that use active managerial monitoring to gain private information in order to maximize returns [J. Finance 50 (1995) 301], JVCs have traditionally used portfolio diversification to attenuate investment risks [Hamada, Y., 2001. Nihon no Bencha Kyapitaru no Genkyo (Current State of Japanese Venture Capital), Nihon Bencha Gakkai VC Seminar, May 7]. We found that performance pay is positively related to active monitoring …
The Impact Of Regulation Fair Disclosure On Information Asymmetry And Trading: An Intraday Analysis, Chiraphol N. Chiyachantana, Christine X. Jiang, Nareerat Taechapiroontong, Robert A. Wood
The Impact Of Regulation Fair Disclosure On Information Asymmetry And Trading: An Intraday Analysis, Chiraphol N. Chiyachantana, Christine X. Jiang, Nareerat Taechapiroontong, Robert A. Wood
Research Collection Lee Kong Chian School Of Business
This study examines the impact of Regulation Fair Disclosure (FD) on liquidity, information asymmetry, and institutional and retail investors trading behavior. Our main findings suggest three conclusions. First, Regulation FD has been effective in improving liquidity and in decreasing the level of information asymmetry. Second, retail trading activity increases dramatically after earnings announcements but there is a significant decline in institutional trading surrounding earnings announcements, particularly in the pre‐announcement period. Last, the decline in information asymmetry around earnings announcements is closely associated with a lower participation rate in the pre‐announcement period and more active trading of retail investors after earnings …
Anonymous Secure Routing In Mobile Ad-Hoc Networks, Bo Zhu, Zhiguo Wan, Mohan S. Kankanhalli, Feng Bao, Robert H. Deng
Anonymous Secure Routing In Mobile Ad-Hoc Networks, Bo Zhu, Zhiguo Wan, Mohan S. Kankanhalli, Feng Bao, Robert H. Deng
Research Collection School Of Computing and Information Systems
Although there are a large number of papers on secure routing in mobile ad-hoc networks, only a few consider the anonymity issue. In this paper, we define more strict requirements on the anonymity and security properties of the routing protocol, and notice that previous research works only provide Weak Location Privacy and Route Anonymity, and are vulnerable to specific attacks. Therefore, we propose the Anonymous Secure Routing (ASR) protocol that can provide additional properties on anonymity, i.e. Identity Anonymity and Strong Location Privacy, and at the same time ensure the security of discovered routes against various passive and active attacks. …
Singapore: Always Restructuring, Avoiding Convergence And Reining In Divergence, Tan K. B. Eugene
Singapore: Always Restructuring, Avoiding Convergence And Reining In Divergence, Tan K. B. Eugene
Research Collection Yong Pung How School Of Law
Even as the government declares Asia - with China and India at the forefront - as a region of change and opportunities, the fear of becoming irrelevant ensures that Singapore will not relent in its drive to stay ahead of the regional economic competition. For instance, the search for new industrial winners, after the successful industrial programmes in electronics and the biomedical sciences, has begun resolutely with the formation of a high-powered ministerial committee to mould Singapore's research and development destiny. Restructuring in Singapore is a governing norm that is very much invoked as a policy necessity and a way …
Pre-Crime, Pre-Punishment And Pre-Desert, John N. Williams
Pre-Crime, Pre-Punishment And Pre-Desert, John N. Williams
Research Collection School of Social Sciences
No abstract provided.
The Changing Political Economy Of Party Membership, Riccardo Pelizzo
The Changing Political Economy Of Party Membership, Riccardo Pelizzo
Research Collection School of Social Sciences
Although few scholars would dispute from an empirical point of view the fact that parties change their electoral strategies, ideological stances and organizational structures over time, there is not much agreement on how these changes, above all party organizational change, have to be understood from a theoretical point of view. This is especially true with regard to the transformations that party organizations have undergone from the early 1970s on. In fact, although party organizational changes in the past three decades have generally been considered to be signs of the so called party crisis, the agreement on this analytical perspective is …
Multivariate Stochastic Volatility Models: Bayesian Estimation And Model Comparison, Jun Yu, Renate Meyer
Multivariate Stochastic Volatility Models: Bayesian Estimation And Model Comparison, Jun Yu, Renate Meyer
Research Collection School Of Economics
In this paper we show that fully likelihood-based estimation and comparison of multivariate stochastic volatility (SV) models can be easily performed via a freely available Bayesian software called WinBUGS. Moreover, we introduce to the literature several new specifications which are natural extensions to certain existing models, one of which allows for time varying correlation coefficients. Ideas are illustrated by fitting, to a bivariate time series data of weekly exchange rates, nine multivariate SV models, including the specifications with Granger causality in volatility, time varying correlations, heavy-tailed error distributions, additive factor structure, and multiplicative factor structure. Empirical results suggest that the …
Asymmetric Response Of Volatility: Evidence From Stochastic Volatility Models And Realized Volatility, Jun Yu
Research Collection School Of Economics
This paper examines the asymmetric response of equity volatility to return shocks. We generalize the news impact function (NIF), originally introduced by Engle and Ng (1993) to study asymmetric volatility under the ARCH-type models, to be applicable to both stochastic volatility (SV) and ARCH-type models. Based on the generalized concept, we provide a unified framework to examine asymmetric properties of volatility. A new asymmetric volatility model, which nests both ARCH and SV models and at the same time allows for a more flexible NIF, is proposed. Empirical results based on daily index return data support the classical asymmetric SV model …