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Articles 6001 - 6030 of 8706
Full-Text Articles in Entire DC Network
Rules Or Consequences? The Role Of Ethical Mind-Sets In Moral Dynamics, Gert Cornelisson, Michael Ramsay Bashshur, Julian Rode, Marc Le Menestrel
Rules Or Consequences? The Role Of Ethical Mind-Sets In Moral Dynamics, Gert Cornelisson, Michael Ramsay Bashshur, Julian Rode, Marc Le Menestrel
Research Collection Lee Kong Chian School Of Business
Recent research on the dynamics of moral behavior has documented two contrasting phenomena—moral consistency and moral balancing. Moral balancing refers to the phenomenon whereby behaving ethically or unethically decreases the likelihood of engaging in the same type of behavior again later. Moral consistency describes the opposite pattern—engaging in ethical or unethical behavior increases the likelihood of engaging in the same type of behavior later on. The three studies reported here supported the hypothesis that individuals’ ethical mind-set (i.e., outcome-based vs. rule-based) moderates the impact of an initial ethical or unethical act on the likelihood of behaving ethically on a subsequent …
Short Selling And The Price Discovery Process, Ekkehart Boehmer, Juan Julie Wu
Short Selling And The Price Discovery Process, Ekkehart Boehmer, Juan Julie Wu
Research Collection Lee Kong Chian School Of Business
We show that stock prices are more accurate when short sellers are more active. First, in a large panel of NYSE-listed stocks, intraday informational efficiency of prices improves with greater shorting flow. Second, at monthly and annual horizons, more shorting flow accelerates the incorporation of public information into prices. Third, greater shorting flow reduces post-earnings-announcement drift for negative earnings surprises. Fourth, short sellers change their trading around extreme return events in a way that aids price discovery and reduces divergence from fundamental values. These results are robust to various econometric specifications, and their magnitude is economically meaningful.
Adjusting Medical School Admission: Assessing Interpersonal Skills Using Situational Judgement Tests, Filip Lievens
Adjusting Medical School Admission: Assessing Interpersonal Skills Using Situational Judgement Tests, Filip Lievens
Research Collection Lee Kong Chian School Of Business
Context: Todays formal medical school admission systems often include only cognitively oriented tests, although most medical school curricula emphasise both cognitive and non-cognitive factors. Situational judgement tests (SJTs) may represent an innovative approach to the formal measurement of interpersonal skills in large groups of candidates in medical school admission processes. This study examined the validity of interpersonal video-based SJTs in relation to a variety of outcome measures. Methods: This study used a longitudinal and multiple-cohort design to examine anonymised medical school admissions and medical education data. It focused on data for the Flemish medical school admission examination between 1999 and …
This Land Was Made For You And Me: Public Participation In Land Use Decisions In Singapore, Jack Tsen-Ta Lee
This Land Was Made For You And Me: Public Participation In Land Use Decisions In Singapore, Jack Tsen-Ta Lee
Research Collection Yong Pung How School Of Law
No abstract provided.
Improving Model Checking Stateful Timed Csp With Non-Zenoness Through Clock-Symmetry Reduction, Yuanjie Si, Jun Sun, Yang Liu, Ting Wang
Improving Model Checking Stateful Timed Csp With Non-Zenoness Through Clock-Symmetry Reduction, Yuanjie Si, Jun Sun, Yang Liu, Ting Wang
Research Collection School Of Computing and Information Systems
Real-time system verification must deal with a special notion of ‘fairness’, i.e., clocks must always be able to progress. A system run which prevents clocks from progressing unboundedly is known as Zeno. Zeno runs are infeasible in reality and thus must be pruned during system verification. Though zone abstraction is an effective technique for model checking real-time systems, it is known that zone graphs (e.g., those generated from Timed Automata models) are too abstract to directly infer time progress and hence non-Zenoness. As a result, model checking with non-Zenoness (i.e., existence of a non-Zeno counterexample) based on zone graphs only …
A Utp Semantics For Communicating Processes With Shared Variables, Ling Shi, Yongxin Zhao, Yang Liu, Jun Sun, Jin Song Dong, Shengchao Qin
A Utp Semantics For Communicating Processes With Shared Variables, Ling Shi, Yongxin Zhao, Yang Liu, Jun Sun, Jin Song Dong, Shengchao Qin
Research Collection School Of Computing and Information Systems
CSP# (Communicating Sequential Programs) is a modelling language designed for specifying concurrent systems by integrating CSP-like compositional operators with sequential programs updating shared variables. In this paper, we define an observation-oriented denotational semantics in an open environment for the CSP# language based on the UTP framework. To deal with shared variables, we lift traditional event-based traces into hybrid traces which consist of event-state pairs for recording process behaviours. We also define refinement to check process equivalence and present a set of algebraic laws which are established based on our denotational semantics. Our approach thus provides a rigorous means for reasoning …
Vtrust: A Formal Modeling And Verification Framework For Virtualization Systems, Jianan Hao, Yang Liu, Wentong Cai, Guangdong Bai, Jun Sun
Vtrust: A Formal Modeling And Verification Framework For Virtualization Systems, Jianan Hao, Yang Liu, Wentong Cai, Guangdong Bai, Jun Sun
Research Collection School Of Computing and Information Systems
Virtualization is widely used for critical services like Cloud computing. It is desirable to formally verify virtualization systems. However, the complexity of the virtualization system makes the formal analysis a difficult task, e.g., sophisticated programs to manipulate low-level technologies, paged memory management, memory mapped I/O and trusted computing. In this paper, we propose a formal framework, vTRUST, to formally describe virtualization systems with a carefully designed abstraction. vTRUST includes a library to model configurable hardware components and technologies commonly used in virtualization. The system designer can thus verify virtualization systems on critical properties (e.g., confidentiality, verifiability, isolation and PCR consistency) …
Verification Of Functional And Non-Functional Requirements Of Web Service Composition, Manman Chen, Tian Huat Tan, Jun Sun, Yang Liu, Jun Pang, Xiaohong Li
Verification Of Functional And Non-Functional Requirements Of Web Service Composition, Manman Chen, Tian Huat Tan, Jun Sun, Yang Liu, Jun Pang, Xiaohong Li
Research Collection School Of Computing and Information Systems
Web services have emerged as an important technology nowadays. There are two kinds of requirements that are crucial to web service composition, which are functional and non-functional requirements. Functional requirements focus on functionality of the composed service, e.g., given a booking service, an example of functional requirements is that a flight ticket with price higher than $2000 will never be purchased. Non-functional requirements are concerned with the quality of service (QoS), e.g., an example of the booking service’s non-functional requirements is that the service will respond to the user within 5 seconds. Non-functional requirements are important to web service composition, …
Efficient Salient Region Detection With Soft Image Abstraction, Ming-Ming Cheng, Jonathan Warrell, Wen-Yan Lin, Shuai Zheng, Vibhav Vineet, Nigel Crook
Efficient Salient Region Detection With Soft Image Abstraction, Ming-Ming Cheng, Jonathan Warrell, Wen-Yan Lin, Shuai Zheng, Vibhav Vineet, Nigel Crook
Research Collection School Of Computing and Information Systems
Detecting visually salient regions in images is one of the fundamental problems in computer vision. We propose a novel method to decompose an image into large scale perceptually homogeneous elements for efficient salient region detection, using a soft image abstraction representation. By considering both appearance similarity and spatial distribution of image pixels, the proposed representation abstracts out unnecessary image details, allowing the assignment of comparable saliency values across similar regions, and producing perceptually accurate salient region detection. We evaluate our salient region detection approach on the largest publicly available dataset with pixel accurate annotations. The experimental results show that the …
Robust Non-Parametric Data Fitting For Correspondence Modeling, Wen-Yan Lin, Ming-Ming Cheng, Shuai Zheng, Jiangbo Lu, Nigel Crook
Robust Non-Parametric Data Fitting For Correspondence Modeling, Wen-Yan Lin, Ming-Ming Cheng, Shuai Zheng, Jiangbo Lu, Nigel Crook
Research Collection School Of Computing and Information Systems
We propose a generic method for obtaining nonparametric image warps from noisy point correspondences. Our formulation integrates a huber function into a motion coherence framework. This makes our fitting function especially robust to piecewise correspondence noise (where an image section is consistently mismatched). By utilizing over parameterized curves, we can generate realistic nonparametric image warps from very noisy correspondence. We also demonstrate how our algorithm can be used to help stitch images taken from a panning camera by warping the images onto a virtual push-broom camera imaging plane.
Verifying Linearizability Via Optimized Refinement Checking, Yang Liu, Wei Chen, Yanhong A. Liu, Jun Sun, Shao Jie Zhang, Jin Song Dong Dong
Verifying Linearizability Via Optimized Refinement Checking, Yang Liu, Wei Chen, Yanhong A. Liu, Jun Sun, Shao Jie Zhang, Jin Song Dong Dong
Research Collection School Of Computing and Information Systems
Linearizability is an important correctness criterion for implementations of concurrent objects. Automatic checking of linearizability is challenging because it requires checking that: 1) All executions of concurrent operations are serializable, and 2) the serialized executions are correct with respect to the sequential semantics. In this work, we describe a method to automatically check linearizability based on refinement relations from abstract specifications to concrete implementations. The method does not require that linearization points in the implementations be given, which is often difficult or impossible. However, the method takes advantage of linearization points if they are given. The method is based on …
Modeling And Verifying Hierarchical Real-Time Systems Using Stateful Timed Csp, Jun Sun, Yang Liu, Jin Song Dong, Yan Liu, Ling Shi, Étienne André
Modeling And Verifying Hierarchical Real-Time Systems Using Stateful Timed Csp, Jun Sun, Yang Liu, Jin Song Dong, Yan Liu, Ling Shi, Étienne André
Research Collection School Of Computing and Information Systems
Modeling and verifying complex real-time systems are challenging research problems. The de facto approach is based on Timed Automata, which are finite state automata equipped with clock variables. Timed Automata are deficient in modeling hierarchical complex systems. In this work, we propose a language called Stateful Timed CSP and an automated approach for verifying Stateful Timed CSP models. Stateful Timed CSP is based on Timed CSP and is capable of specifying hierarchical real-time systems. Through dynamic zone abstraction, finite-state zone graphs can be generated automatically from Stateful Timed CSP models, which are subject to model checking. Like Timed Automata, Stateful …
Momentum Strategies In Futures Markets And Trend Following Funds, Akindynos-Nikolaos Baltas, Robert Kosowski
Momentum Strategies In Futures Markets And Trend Following Funds, Akindynos-Nikolaos Baltas, Robert Kosowski
Research Collection BNP Paribas Hedge Fund Centre
In this paper, we rigorously establish a relationship between time-series momentum strategies in futures markets and commodity trading advisors (CTAs) and examine the question of capacity constraints in trend-following investing. First, we construct a very comprehensive set of time-series momentum benchmark portfolios. Second, we provide evidence that CTAs follow time-series momentum strategies, by showing that such benchmark strategies have high explanatory power in the time-series of CTA index returns. Third, we do not find evidence of statistically significant capacity constraints based on two different methodologies and several robustness tests. Our results have important implications for hedge fund studies and investors.
Changes In The White-Black House Value Distribution Gap From 1997 To 2005, Eric Fesselmeyer, Kien T. Le, Kiat Ying Seah
Changes In The White-Black House Value Distribution Gap From 1997 To 2005, Eric Fesselmeyer, Kien T. Le, Kiat Ying Seah
Research Collection College of Integrative Studies
This paper examines the white-black house value gap across the entire value distribution. Instead of using standard conditional mean analysis and decomposition methods (via OLS regression), we estimate and decompose the changes in the white-black house value gap from 1997 to 2005 using quantile regression. We find that the racial gap in 1997 and 2005 is mostly explained by differences in housing characteristics of white- and black-owned houses but that the variation in the racial gap is explained by racial differences in implicit prices of housing characteristics. Our results show that analysis at the conditional mean masks variations at the …
Using Foursquare: Check‐Ins Are Not Just For Books!, Chee Hsien Aaron (Zheng Zhixian) Tay, Georgiana Glass, Shu Wen Chew
Using Foursquare: Check‐Ins Are Not Just For Books!, Chee Hsien Aaron (Zheng Zhixian) Tay, Georgiana Glass, Shu Wen Chew
Research Collection Library
Purpose – This paper aims to provide an overview of how the National University of Singapore (NUS) Libraries has been using FourSquare Specials to engage users and to promote library activities and events. This paper will describe the implementation of various FourSquare “Specials” in the different library branches and the reactions of the users. Design/methodology/approach – The paper provides an analysis of the check‐ins at the different NUS Libraries. Firstly, there is a comparison of the historical total number of check‐ins at the main Central Library versus other popular venues on campus, as well as a benchmark against other academic …
Social Innovation Labs: A Tool For Social Integration, Pradeep Ghosh
Social Innovation Labs: A Tool For Social Integration, Pradeep Ghosh
Social Space
The Organisation for Awareness of Integrated Social Security (OAS iS) has designed a different approach to innovation in India by creating social innovation labs to work across the social sector. Pradeep Ghosh describes the approach and the work of OAS iS, and shows how social innovation labs can play an increasingly important role in creating solutions for the Indian society.
From Aversion To Acceptance: Evolution Of The Asean Human Rights Agenda, Siraj Aziz Shaik
From Aversion To Acceptance: Evolution Of The Asean Human Rights Agenda, Siraj Aziz Shaik
2008 Asian Business & Rule of Law initiative
This paper examines the evolution of ASEAN’s attitude towards human rights from one of aversion on the premise of cultural relativism to the acceptance of its universality as demonstrated by the adoption of the ASEAN Human Rights Declaration. In doing so, it also examines the veracity of cultural relativist objection to universality of human rights. The paper then examines the obstacles that militate against ensuring institutionalisation on the ground via the rule of law.
Arrow-Fisher-Hanemann-Henry And Dixit-Pindyck Option Values Under Strategic Interactions, Tomoki Fujii, Ryuichiro Ishikawa
Arrow-Fisher-Hanemann-Henry And Dixit-Pindyck Option Values Under Strategic Interactions, Tomoki Fujii, Ryuichiro Ishikawa
Research Collection School Of Economics
We extend the Arrow–Fisher–Hanemann–Henry (AFHH) and Dixit–Pindyck (DP) option values to a game situation. By reinterpreting the AFHH option value as a change in the surplus from conservation because of the prospect of future information, we deal with a conceptual difficulty associated with the AFHH option value in the presence of strategic interactions. We then introduce the DP option value into a game situation. We show that the equivalence between the expected value of information and the DP option value in the standard model does not hold under strategic interactions.
No Pass No Drive: Education And Allocation Of Time, Rashmi Rekha Barua, Marian Vidal-Fernandez
No Pass No Drive: Education And Allocation Of Time, Rashmi Rekha Barua, Marian Vidal-Fernandez
Research Collection School Of Economics
Since the late 1980s, several states in the US have introduced No Pass No Drive (NPND) laws that set minimum academic requirements for teenagers under 18 to obtain a driving license. Using data from the U.S. Census and Monitoring the Future (MTF) survey, we exploit cross-state, cross-cohort and cross-time variation in NPND laws to study their effect on educational outcomes and allocation of time among teenagers. Estimates using the Census show that NPND laws have a positive and significant effect on both years of completed schooling and the probability of high school completion among boys and blacks, but not girls. …
Nonparametric Dynamic Panel Data Models: Kernel Estimation And Specification Testing, Liangjun Su, Xun Lu
Nonparametric Dynamic Panel Data Models: Kernel Estimation And Specification Testing, Liangjun Su, Xun Lu
Research Collection School Of Economics
Motivated by the first differencing method for linear panel data models, we propose a class of iterative local polynomial estimators for nonparametric dynamic panel data models with or without exogeous regressors. The estimators utilize the additive structure of the first-differenced model, the fact that the two additive components have the same functional form, and the unknown function of interest is implicitly defined as a solution of a Fredholm integral equation of the second kind. We establish the uniform consistency and asymptotic normality of the estimators. We also propose a consistent test for the correct specification of linearity in typical dynamic …
Qml Estimation Of Dynamic Panel Data Models With Spatial Errors, Liangjun Su, Zhenlin Yang
Qml Estimation Of Dynamic Panel Data Models With Spatial Errors, Liangjun Su, Zhenlin Yang
Research Collection School Of Economics
We propose quasi maximum likelihood (QML) estimation of dynamic panel models with spatial errors when the cross-sectional dimension n is large and the time dimension T is fixed. We consider both the random effects and fixed effects models and derive the limiting distributions of the QML estimators under different assumptions on the initial observations. We propose a residual-based bootstrap method for estimating the standard errors of the QML estimators. Monte Carlo simulation shows that both the QML estimators and the bootstrap standard errors perform well in finite samples under a correct assumption on initial observations, but may perform poorly when …
The Informavore Shopper: Analysis Of Information Foraging, System Design, And Purchasing Behavior In Online Retail Stores, Jeff Min Teck Hong
The Informavore Shopper: Analysis Of Information Foraging, System Design, And Purchasing Behavior In Online Retail Stores, Jeff Min Teck Hong
Dissertations and Theses Collection (Open Access)
Global online retail sales are on the rise and are predicted to experience a double digit growth annually over the next three years. Given little marginal cost involved in adding new products and brands to their catalogues, online retailers tend to increase product and brand offerings to increase sales by selling products that could not have been sold due to space constraints in physical stores. Frank Urbanowski, Director of MIT Press, attributed the 12% increase in sales of backlist titles directly to increased accessibility to these titles through the Internet. For consumers, the ability to buy products that they would …
Assessment Centers And The Measurement Of Personality, Neil D. Christiansen, Brian J. Hoffman, Filip Lievens, Andrew B. Speer
Assessment Centers And The Measurement Of Personality, Neil D. Christiansen, Brian J. Hoffman, Filip Lievens, Andrew B. Speer
Research Collection Lee Kong Chian School Of Business
Although personality constructs are now widely accepted as being important for understanding work behavior, self-report personality tests as a method of assessment are not without their critics (e.g., Morgeson et al., 2007). Whether misguided or not, concerns persist regarding the validity of these measures and the issue of applicant faking has yet to be fully resolved (Tett & Christiansen, 2007). Moreover, applicant reactions tend to be less favorable for personality inventories than many other assessments commonly used in employment settings (Hausknecht, Day, & Thomas, 2004). To some, self-report inventories may be a poor way to assess personality traits, and yet …
The Impact Of Sfas133 On Income Smoothing By Banks Through Loan Loss Provisions, Emre Kilic, Gerald J. Lobo, Tharindra Ranasinghe, K. Sivaramakrishnan
The Impact Of Sfas133 On Income Smoothing By Banks Through Loan Loss Provisions, Emre Kilic, Gerald J. Lobo, Tharindra Ranasinghe, K. Sivaramakrishnan
Research Collection School Of Accountancy
We examine the impact of SFAS 133, Accounting for Derivative Instruments and Hedging Activities, on the reporting behavior of commercial banks and the informativeness of their financial statements. We argue that because the stricter recognition and classification requirements of SFAS 133 reduced banks' ability to smooth income through derivatives, banks more affected by SFAS 133 will rely more on loan loss provisions to smooth income. We find evidence consistent with this argument. We also find that the increased reliance on loan loss provisions for smoothing income has impaired the informativeness of loan loss provisions.
Managerial Incentives And Management Forecast Precision, Qiang Cheng, Ting Luo, Heng Yue
Managerial Incentives And Management Forecast Precision, Qiang Cheng, Ting Luo, Heng Yue
Research Collection School Of Accountancy
Managers have great discretion in determining management forecast characteristics, but little is known about how managerial incentives affect these characteristics. In this paper, we examine whether managers strategically choose the precision of their earnings forecasts for self-serving purposes. Building on prior research demonstrating that the market reaction to vague management forecasts is weaker than its reaction to precise forecasts, we find that for management forecasts disclosed before insider sales, more positive (negative) news forecasts are more (less) precise than other management forecasts. The opposite applies to management forecasts disclosed before insider purchases. These results are consistent with managers strategically choosing …
The Opportunistic Reporting Of Material Events And The Apparent Misconception Of Investors' Reaction, Dan Segal, Benjamin Segal
The Opportunistic Reporting Of Material Events And The Apparent Misconception Of Investors' Reaction, Dan Segal, Benjamin Segal
Research Collection School Of Accountancy
Using a comprehensive sample of non-earnings 8-K filings from 1996 to 2011, we examine whether firms engage in opportunistic reporting of mandatory and voluntary news. We find strong evidence of opportunistic reporting of negative news, especially among public firms. Public firms are more likely to delay disclosure of negative news, report negative news after trading hours, and report on the last day of the week. We also find evidence of opportunistic bundling of news. Our findings support the notion that managers engage in strategic disclosure by delaying or obfuscating negative news in order to mitigate the potential market reaction. Factors …
How Does Culture Influence Corporate Risk-Taking?, Kai Li, Dale Griffin, Heng Yue, Longkai Zhao
How Does Culture Influence Corporate Risk-Taking?, Kai Li, Dale Griffin, Heng Yue, Longkai Zhao
Research Collection School Of Accountancy
We investigate the role of national culture in corporate risk-taking. We postulate that culture influencescorporate risk-taking both through its effect on managerial decision-making and through its effect on acountry’s formal institutions. Further, we postulate that the influence of culture is conditioned on theextent of managerial discretion as measured by earnings discretion and firm size. Using firm-level datafrom 35 countries and employing a hierarchical linear modeling approach to isolate the effects of firmleveland country-level variables, we show that individualism has a positive and significant association,whereas uncertainty avoidance and harmony have negative and significant associations, with corporaterisk-taking. Greater earnings discretion strengthens and …
Utility Of Potential Misdiagnoses In Predicting Foodborne Outbreaks, Lucia Lucia, Artur Dubrawski, Lujie Chen
Utility Of Potential Misdiagnoses In Predicting Foodborne Outbreaks, Lucia Lucia, Artur Dubrawski, Lujie Chen
Research Collection School Of Computing and Information Systems
To investigate utility of using inpatient and emergency room diagnoses to detect outbreaks of Salmonellosis in humans. To quantify the impact of including in the analysis cases diagnosed with conditions that may have physiological appearance similar to Salmonellosis.
Improving Internet Security Through Information Disclosure: A Field Quasi-Experiment, Qian Tang, Leigh L. Linden, John S. Quarterman, Andrew B. Whinston
Improving Internet Security Through Information Disclosure: A Field Quasi-Experiment, Qian Tang, Leigh L. Linden, John S. Quarterman, Andrew B. Whinston
Research Collection School Of Computing and Information Systems
Cybersecurity is a national priority in this big data era. Because of negative externalities and the resulting lack of economic incentives, companies often underinvest in security controls, despite government and industry recommendations. Although many existing studies on security have explored technical solutions, only a few have looked at the economic motivations. To fill the gap, we propose an approach to increase the incentives of organizations to address security problems. Specifically, we utilize and process existing security vulnerability data, derive explicit security performance information, and disclose the information as feedback to organizations and the public. We regularly release information on the …
Guardian: Hypervisor As Security Foothold For Personal Computers, Yueqiang Cheng, Xuhua Ding
Guardian: Hypervisor As Security Foothold For Personal Computers, Yueqiang Cheng, Xuhua Ding
Research Collection School Of Computing and Information Systems
Personal computers lack of a security foothold to allow the end-users to protect their systems or to mitigate the damage. Existing candidates either rely on a large Trusted Computing Base (TCB) or are too costly to widely deploy for commodity use. To fill this gap, we propose a hypervisor-based security foothold, named as Guardian, for commodity personal computers. We innovate a bootup and shutdown mechanism to achieve both integrity and availability of Guardian. We also propose two security utilities based on Guardian. One is a device monitor which detects malicious manipulation on camera and network adaptors. The other is hyper-firewall …