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Articles 6721 - 6750 of 8696
Full-Text Articles in Entire DC Network
Matching Dependence-Related Queries In The System Dependence Graph., Xiaoyin Wang, David Lo, Jiefeng Cheng, Lu Zhang, Hong Mei, Jeffrey Xu Yu
Matching Dependence-Related Queries In The System Dependence Graph., Xiaoyin Wang, David Lo, Jiefeng Cheng, Lu Zhang, Hong Mei, Jeffrey Xu Yu
Research Collection School Of Computing and Information Systems
In software maintenance and evolution, it is common that developers want to apply a change to a number of similar places. Due to the size and complexity of the code base, it is challenging for developers to locate all the places that need the change. A main challenge in locating the places that need the change is that, these places share certain common dependence conditions but existing code searching techniques can hardly handle dependence relations satisfactorily. In this paper, we propose a technique that enables developers to make queries involving dependence conditions and textual conditions on the system dependence graph …
Scenario-Based And Value-Based Specification Mining: Better Together, David Lo, Shahar Maoz
Scenario-Based And Value-Based Specification Mining: Better Together, David Lo, Shahar Maoz
Research Collection School Of Computing and Information Systems
Specification mining takes execution traces as input and extracts likely program invariants, which can be used for comprehension, verification, and evolution related tasks. In this work we integrate scenario-based specification mining, which uses data-mining algorithms to suggest ordering constraints in the form of live sequence charts, an inter-object, visual, modal, scenario-based specification language, with mining of value-based invariants, which detects likely invariants holding at specific program points. The key to the integration is a technique we call scenario-based slicing, running on top of the mining algorithms to distinguish the scenario-specific invariants from the general ones. The resulting suggested specifications are …
Shortest Path Computation On Air Indexes, Georgios Kellaris, Kyriakos Mouratidis
Shortest Path Computation On Air Indexes, Georgios Kellaris, Kyriakos Mouratidis
Research Collection School Of Computing and Information Systems
Shortest path computation is one of the most common queries in location-based services that involve transportation net- works. Motivated by scalability challenges faced in the mo- bile network industry, we propose adopting the wireless broad- cast model for such location-dependent applications. In this model the data are continuously transmitted on the air, while clients listen to the broadcast and process their queries locally. Although spatial problems have been considered in this environment, there exists no study on shortest path queries in road networks. We develop the rst framework to compute shortest paths on the air, and demonstrate the practicality and …
Anger, Fear, And Escalation Of Commitment, Ming-Hong Tsai, Maia J. Young
Anger, Fear, And Escalation Of Commitment, Ming-Hong Tsai, Maia J. Young
Research Collection School of Social Sciences
Two studies examined how discrete emotions influence escalation of commitment. Study 1 demonstrated that anger was associated with more escalation of commitment than fear in a personnel hiring-appraisal context. In addition, it revealed the mediating effect of risk perception; angry compared to fearful individuals perceived lower risk in their initial decision, which in turn increased the tendency to escalate commitment. Study 2 replicated the pattern of results of Study 1 in a financial decision-making situation. Contrary to conclusions drawn from the results of prior research, the current studies suggest that not all negative emotions alleviate escalation of commitment.
Self And Other: Continental And Classical Chinese Thought, Steven Burik
Self And Other: Continental And Classical Chinese Thought, Steven Burik
Research Collection School of Social Sciences
Traditionally, metaphysical notions of self and other presuppose a dualism that underlies much of Western philosophy. This dualism is opposed by accounts of self and other in recent continental philosophy and classical Chinese philosophy, which I compare. I argue that the self is seen in continental and Chinese thought as embedded in (ethical) relations and language, and not as transcendent or prior in the metaphysical sense to them. I argue for this by focussing on three themes: self and language, self as relational and embedded in the world or contextual environment, and self and the particular other. These three themes …
A Multilevel Model Of Minority Opinion Expression And Team Decision-Making Effectiveness, Guihyun Grace Park, Richard D. Deshon
A Multilevel Model Of Minority Opinion Expression And Team Decision-Making Effectiveness, Guihyun Grace Park, Richard D. Deshon
Research Collection School of Social Sciences
The consideration of minority opinions when making team decisions is an important factor that contributes to team effectiveness. A multilevel model of minority opinion influence in decision-making teams is developed to address the conditions that relate to adequate consideration of minority opinions. Using a sample of 57 teams working on a simulated airport security-screening task, we demonstrate that team learning goal orientation influences the confidence of minority opinion holders and team discussion. Team discussion, in turn, relates to minority influence, greater decision quality, and team satisfaction. Implications for managing decision-making teams in organizations are discussed.
A Robust Lm Test For Spatial Error Components, Zhenlin Yang
A Robust Lm Test For Spatial Error Components, Zhenlin Yang
Research Collection School Of Economics
This paper presents previous termanext term modified previous termLM test of spatial error components,next term which is shown to be previous termrobustnext term against distributional misspecifications and previous termspatialnext term layouts. The proposed previous termtestnext term differs from the previous termLM testnext term of Anselin (2001) by previous termanext term term in the denominators of the previous termtestnext term statistics. This term disappears when either the previous termerrorsnext term are normal, or the variance of the diagonal elements of the product of previous termspatialnext term weights matrix and its transpose is zero or approaches to zero as sample size goes …
Comprehensive Evaluation Of Association Measures For Fault Localization, Lucia Lucia, David Lo, Lingxiao Jiang, Aditya Budi
Comprehensive Evaluation Of Association Measures For Fault Localization, Lucia Lucia, David Lo, Lingxiao Jiang, Aditya Budi
Research Collection School Of Computing and Information Systems
In statistics and data mining communities, there have been many measures proposed to gauge the strength of association between two variables of interest, such as odds ratio, confidence, Yule-Y, Yule-Q, Kappa, and gini index. These association measures have been used in various domains, for example, to evaluate whether a particular medical practice is associated positively to a cure of a disease or whether a particular marketing strategy is associated positively to an increase in revenue, etc. This paper models the problem of locating faults as association between the execution or non-execution of particular program elements with failures. There have been …
An Automated Approach For Finding Variable-Constant Pairing Bugs, Julia Lawall, David Lo
An Automated Approach For Finding Variable-Constant Pairing Bugs, Julia Lawall, David Lo
Research Collection School Of Computing and Information Systems
Named constants are used heavily in operating systems code, both as internal flags and in interactions with devices. Decision making within an operating system thus critically depends on the correct usage of these values. Nevertheless, compilers for the languages typically used in implementing operating systems provide little support for checking the usage of named constants. This affects correctness, when a constant is used in a context where its value is meaningless, and software maintenance, when a constant has the right value for its usage context but the wrong name. We propose a hybrid program-analysis and data-mining based approach to identify …
Embellishing Text Search Queries To Protect User Privacy, Hwee Hwa Pang, Xuhua Ding, Xiaokui Xiao
Embellishing Text Search Queries To Protect User Privacy, Hwee Hwa Pang, Xuhua Ding, Xiaokui Xiao
Research Collection School Of Computing and Information Systems
Users of text search engines are increasingly wary that their activities may disclose confidential information about their business or personal profiles. It would be desirable for a search engine to perform document retrieval for users while protecting their intent. In this paper, we identify the privacy risks arising from semantically related search terms within a query, and from recurring highspecificity query terms in a search session. To counter the risks, we propose a solution for a similarity text retrieval system to offer anonymity and plausible deniability for the query terms, and hence the user intent, without degrading the system’s precision-recall …
Reference Group Effects In The Measurement Of Personality And Attitudes, Marcus Crede, Michael Ramsay Bashshur, Sarah Niehorster
Reference Group Effects In The Measurement Of Personality And Attitudes, Marcus Crede, Michael Ramsay Bashshur, Sarah Niehorster
Research Collection Lee Kong Chian School Of Business
Reference-group effects (discovered in cross-cultural settings) occur when responses to self-report items are based not on respondents’ absolute level of a construct but rather on their level relative to a salient comparison group. In this article, we examine the impact of reference-group effects on the assessment of self-reported personality and attitudes. Two studies illustrate that a reference-group effect can be induced by small changes to instruction sets, changes that mirror the instruction sets of commonly used measures of personality. Scales that specified different reference groups showed substantial reductions in criterion-related validities for academic performance, self-reported counterproductive behaviors, and self-reported health …
Obtaining Intangible And Tangible Benefits From Corporate Social Responsibility, Wei Nurn Chong, Gilbert Tan
Obtaining Intangible And Tangible Benefits From Corporate Social Responsibility, Wei Nurn Chong, Gilbert Tan
Research Collection Lee Kong Chian School Of Business
The relationship between corporate social responsibility (CSR) and corporate financial performance has been heavily studied in past research. However, little theory has been developed on how CSR may lead to greater corporate financial performance. In this paper, the authors attempt to fill this theoretical gap by explaining how CSR leads to the tangible benefits of attracting better employees, reduced turnover rate, greater efficiency, and reduced operating costs, via the intangible benefits of firm reputation, organizational commitment, and learning. Thereafter, managerial implications and further research opportunities are discussed.
Investor Inattention And The Underreaction To Stock Recommendations, Roger Loh
Investor Inattention And The Underreaction To Stock Recommendations, Roger Loh
Research Collection Lee Kong Chian School Of Business
Investors’ reaction to stock recommendations is often incomplete so that there is a predictable post-recommendation drift. I investigate investor inattention as a plausible explanation for this drift by using prior turnover as a proxy for attention. I find that low attention stocks react less to stock recommendations than high attention stocks around the three-day event window. Subsequently, the recommendation drift of firms with low attention is more than double in magnitude when compared to firms with high attention. Similar conclusions are reached with alternative proxies for attention. The evidence supports investor inattention as a source of the stock recommendation drift.
The Division Of Matrimonial Assets: A Mathematical Methodology As A "Check"? Ajr V. Ajs, Siyuan Chen
The Division Of Matrimonial Assets: A Mathematical Methodology As A "Check"? Ajr V. Ajs, Siyuan Chen
Research Collection Yong Pung How School Of Law
In a recent High Court decision concerning the division of matrimonial assets, the Judge developed an extensive (and somewhat mathematical) methodology “as a rough check” to his discretionary powers in determining a “just and equitable” division of the matrimonial assets. This introduced a new perspective to an exercise long considered to be impossible to be mathematically precise. This piece considers the extent of the utility of the new methodology.
The Liquidity Risk Of Liquid Hedge Funds, Melvyn Teo
The Liquidity Risk Of Liquid Hedge Funds, Melvyn Teo
Research Collection Lee Kong Chian School Of Business
This paper evaluates hedge funds that grantfavorable redemption terms to investors. Within this group of purportedlyliquid funds, high net inflow funds subsequently outperform low net inflowfunds by 4.79% per year after adjusting for risk. The return impact of fundflows is stronger when funds embrace liquidity risk, when market liquidity islow, and when funding liquidity, as measured by the Treasury-Eurodollar spread,aggregate hedge fund flows, and prime broker stock returns, is tight. Inkeeping with an agency explanation, funds with strong incentives to raisecapital, low manager option deltas, and no manager capital co-invested are morelikely to take on excessive liquidity risk. These results …
Characteristics Of Services: A New Approach Uncovers Their Value, Sabine Moeller
Characteristics Of Services: A New Approach Uncovers Their Value, Sabine Moeller
Research Collection Lee Kong Chian School Of Business
Purpose: Four characteristics have been regularly applied to services: intangibility, heterogeneity, inseparability, perishability (IHIP). More and more exceptions occur which have resulted in substantial criticism. This paper aims to show that each characteristic is valid and useful when related to an individual aspect of services instead of being assigned to services as a single entity. Design/methodology/approach: Based on customer integration, a framework (FTU framework) and a resource typology are developed. These approaches are the theoretical foundation of the analysis. Findings: The FTU framework and a resource typology reveal different aspects of services and allow the assignment of the IHIP characteristics …
Price Movers On The Stock Exchange Of Thailand: Evidence From A Fully Automated Order-Driven Market, Charlie Charoenwong, David K. Ding, Nattawut Jenwittayaroje
Price Movers On The Stock Exchange Of Thailand: Evidence From A Fully Automated Order-Driven Market, Charlie Charoenwong, David K. Ding, Nattawut Jenwittayaroje
Research Collection Lee Kong Chian School Of Business
This study examines trade sizes used by informed traders. The selected sample includes 73 active stocks from the Stock Exchange of Thailand (SET), a pure limit order market, that cover two distinct market conditions of a bull and bear market. Using intraday data, the study finds that large sized trades (i.e., larger than the 75th percentile) account for a disproportionately large impact on changes in traded and quoted prices. This finding compares with the results of studies conducted on U.S. markets that show informed traders employ trade sizes falling between the 40th and 95th percentiles (Barclay and Warner 1993; Chakravarty …
Patrilocal Exogamy As A Monitoring Mechanism: How Inheritance And Residence Patterns Co-Evolve, Brishti Guha
Patrilocal Exogamy As A Monitoring Mechanism: How Inheritance And Residence Patterns Co-Evolve, Brishti Guha
Research Collection School Of Economics
Economists have modeled inheritance norms assuming the pattern of post-marital residence is exogenous. We model the co-evolution of these two institutions, examining how patrilineal inheritance and patrilocal exogamy reinforced each other in a patrilineal-patrilocal equilibrium. We also derive conditions for a matrilineal-matrilocal equilibrium. The endogenous choice of the old to monitor the sexual behavior of the young women who reside with them, thereby affecting the paternity confidence of the young women’s husbands and hence their incentives, is crucial. Our model fits the data on the relationship between inheritance, residence patterns and paternity confidence, and on the importance of paternity uncertainty.
Contagion Effect Of Restatements Through Common Directorships, Chih-Ying Chen, Beng Wee Goh
Contagion Effect Of Restatements Through Common Directorships, Chih-Ying Chen, Beng Wee Goh
Research Collection School Of Accountancy
No abstract provided.
On The Annotation Of Web Videos By Efficient Near-Duplicate Search, Wan-Lei Zhao, Xiao Wu, Chong-Wah Ngo
On The Annotation Of Web Videos By Efficient Near-Duplicate Search, Wan-Lei Zhao, Xiao Wu, Chong-Wah Ngo
Research Collection School Of Computing and Information Systems
With the proliferation of Web 2.0 applications, usersupplied social tags are commonly available in social media as a means to bridge the semantic gap. On the other hand, the explosive expansion of social web makes an overwhelming number of web videos available, among which there exists a large number of near-duplicate videos. In this paper, we investigate techniques which allow effective annotation of web videos from a data-driven perspective. A novel classifier-free video annotation framework is proposed by first retrieving visual duplicates and then suggesting representative tags. The significance of this paper lies in the addressing of two timely issues …
Hoare Logic For Graph Programs, Christopher M. Poskitt, Detlef Plump
Hoare Logic For Graph Programs, Christopher M. Poskitt, Detlef Plump
Research Collection School Of Computing and Information Systems
We present a new approach for verifying programs written in GP (for Graph Programs), an experimental programming language for performing computations on graphs at a high level of abstraction. Taking a labelled graph as input, a graph program nondeterministically applies to it a number of graph transformation rules, directed by simple control constructs such as sequential composition and as-long-as-possible iteration. We adapt classical Hoare logic to the domain of graphs, and describe a system of sound proof rules for showing the partial correctness of graph programs.
The Bi-Objective Master Physician Scheduling Problem, Aldy Gunawan, Hoong Chuin Lau
The Bi-Objective Master Physician Scheduling Problem, Aldy Gunawan, Hoong Chuin Lau
Research Collection School Of Computing and Information Systems
Physician scheduling is the assignment of physicians to perform different duties in the hospital timetable. In this paper, the goals are to satisfy as many physicians’ preferences and duty requirements as possible while ensuring optimum usage of available resources. We present a mathematical programming model to represent the problem as a bi-objective optimization problem. Three different methods based on ε–Constraint Method, Weighted-Sum Method and HillClimbing algorithm are proposed. These methods were tested on a real case from the Surgery Department of a large local government hospital, as well as on randomly generated problem instances. The strengths and weaknesses of the …
A Decision Theoretic Approach To Data Leakage Prevention, Janusz Marecki, Mudhakar Srivastava, Pradeep Reddy Varakantham
A Decision Theoretic Approach To Data Leakage Prevention, Janusz Marecki, Mudhakar Srivastava, Pradeep Reddy Varakantham
Research Collection School Of Computing and Information Systems
In both the commercial and defense sectors a compelling need is emerging for rapid, yet secure, dissemination of information. In this paper we address the threat of information leakage that often accompanies such information flows. We focus on domains with one information source (sender) and many information sinks (recipients) where: (i) sharing is mutually beneficial for the sender and the recipients, (ii) leaking a shared information is beneficial to the recipients but undesirable to the sender, and (iii) information sharing decisions of the sender are determined using imperfect monitoring of the (un)intended information leakage by the recipients.We make two key …
Effect Of Human Biases On Human-Agent Teams, Praveen Paruchuri, Pradeep Reddy Varakantham, Katia Sycara, Paul Scerri
Effect Of Human Biases On Human-Agent Teams, Praveen Paruchuri, Pradeep Reddy Varakantham, Katia Sycara, Paul Scerri
Research Collection School Of Computing and Information Systems
As human-agent teams get increasingly deployed in the real-world, agent designers need to take into account that humans and agents have different abilities to specify preferences. In this paper, we focus on how human biases in specifying preferences for resources impacts the performance of large, heterogeneous teams. In particular, we model the inclination of humans to simplify their preference functions and to exaggerate their utility for desired resources, and show the effect of these biases on the team performance. We demonstrate this on two different problems, which are representative of many resource allocation problems addressed in literature. In both these …
Mining Interaction Behaviors For Email Reply Order Prediction, Byung-Won On, Ee Peng Lim, Jing Jiang, Amruta Purandare, Loo Nin Teow
Mining Interaction Behaviors For Email Reply Order Prediction, Byung-Won On, Ee Peng Lim, Jing Jiang, Amruta Purandare, Loo Nin Teow
Research Collection School Of Computing and Information Systems
In email networks, user behaviors affect the way emails are sent and replied. While knowing these user behaviors can help to create more intelligent email services, there has not been much research into mining these behaviors. In this paper, we investigate user engagingness and responsiveness as two interaction behaviors that give us useful insights into how users email one another. Engaging users are those who can effectively solicit responses from other users. Responsive users are those who are willing to respond to other users. By modeling such behaviors, we are able to mine them and to identify engaging or responsive …
An Efficient Signcryption Scheme With Key Privacy And Its Extension To Ring Signcryption, Chung Ki Li, Guomin Yang, Duncan S. Wong, Xiaotie Deng, Sherman S. M. Chow
An Efficient Signcryption Scheme With Key Privacy And Its Extension To Ring Signcryption, Chung Ki Li, Guomin Yang, Duncan S. Wong, Xiaotie Deng, Sherman S. M. Chow
Research Collection School Of Computing and Information Systems
In Information Processing Letters (2006), Tan pointed out that the anonymous signcryption scheme proposed by Yang, Wong and Deng (YWD) in ISC 2005 provides neither confidentiality nor anonymity. However, no discussion has been made on how a secure scheme can be made and there is no secure scheme available to date. In this paper, we propose a modification of YWD scheme which resolves the security issues of the original scheme without sacrificing its high efficiency and simple design. Indeed, we show that our scheme achieves confidentiality, existential unforgeability and anonymity with more precise reduction bounds. We also give a variation …
Automatic Generation Of Semantic Fields For Annotating Web Images, Gang Wang, Tat Seng Chua, Chong-Wah Ngo, Yong Cheng Wang
Automatic Generation Of Semantic Fields For Annotating Web Images, Gang Wang, Tat Seng Chua, Chong-Wah Ngo, Yong Cheng Wang
Research Collection School Of Computing and Information Systems
The overwhelming amounts of multimedia contents have triggered the need for automatically detecting the semantic concepts within the media contents. With the development of photo sharing websites such as Flickr, we are able to obtain millions of images with usersupplied tags. However, user tags tend to be noisy, ambiguous and incomplete. In order to improve the quality of tags to annotate web images, we propose an approach to build Semantic Fields for annotating the web images. The main idea is that the images are more likely to be relevant to a given concept, if several tags to the image belong …
A New Hardware-Assisted Pir With O(N) Shuffle Cost, Xuhua Ding, Yanjiang Yang, Robert H. Deng, Shuhong Wang
A New Hardware-Assisted Pir With O(N) Shuffle Cost, Xuhua Ding, Yanjiang Yang, Robert H. Deng, Shuhong Wang
Research Collection School Of Computing and Information Systems
Since the concept of private information retrieval (PIR) was first formalized by Chor et al., various constructions have been proposed with a common goal of reducing communication complexity. Unfortunately, none of them is suitable for practical settings mainly due to the prohibitively high cost for either communications or computations. The booming of the Internet and its applications, especially, the recent trend in outsourcing databases, fuels the research on practical PIR schemes. In this paper, we propose a hardware-assisted PIR scheme with a novel shuffle algorithm. Our PIR construction entails O(n) offline computation cost, and constant online operations and O(log n) …
Cloud Services From A Consumer Perspective, Philip Koehler, Arun Anandasivam, Dan Ma
Cloud Services From A Consumer Perspective, Philip Koehler, Arun Anandasivam, Dan Ma
Research Collection School Of Computing and Information Systems
Although there is an increased attention on Cloud Computing in the academic literature in the recent years, most research work focus on technical aspects of cloud computing. Research on consumers’ preferences for cloud services is limited to studies from consulting and industry companies. This paper fills the gap by empirically identifying consumer preferences for cloud service attributes. Using conjoint methods we reveal the relative importance of different attributes of cloud services. The results help both practitioners and academic researchers to better understand the prerequisites of a successful market introduction of cloud services and to design appropriate services. Moreover, the derived …
Stock Return Synchronicity And Technical Trading Rules, Koon Boon Kee, Qihui Chen
Stock Return Synchronicity And Technical Trading Rules, Koon Boon Kee, Qihui Chen
Research Collection School Of Accountancy
No abstract provided.