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Articles 5851 - 5880 of 8706
Full-Text Articles in Entire DC Network
Corporate Elite Networks And Their Effects On Board Performance, Daniel Braun, Jana Oehmichen, Michael Wolff, Toru Yoshikawa
Corporate Elite Networks And Their Effects On Board Performance, Daniel Braun, Jana Oehmichen, Michael Wolff, Toru Yoshikawa
Research Collection Lee Kong Chian School Of Business
No abstract provided.
Improving Tool Support For Software Reverse Engineering In A Security Context, Brendan Cleary, Christoph Treude, Fernando Figueira Filho, Margaret-Anne Storey, Martin Salois
Improving Tool Support For Software Reverse Engineering In A Security Context, Brendan Cleary, Christoph Treude, Fernando Figueira Filho, Margaret-Anne Storey, Martin Salois
Research Collection School Of Computing and Information Systems
Illegal cyberspace activities are increasing rapidly and many software engineers are using reverse engineering methods to respond to attacks. The security-sensitive nature of these tasks, such as the understanding of malware or the decryption of encrypted content, brings unique challenges to reverse engineering: work has to be done offline, files can rarely be shared, time pressure is immense, and there is a lack of tool and process support for capturing and sharing the knowledge obtained while trying to understand assembly code. To help us gain an understanding of this reverse engineering work, we conducted an exploratory study at a government …
Psyhcos: Parameter Synthesis For Hierarchical Concurrent Real-Time Systems, Étienne André, Yang Liu, Jun Sun, Jin Song Dong, Shang-Wei Lin
Psyhcos: Parameter Synthesis For Hierarchical Concurrent Real-Time Systems, Étienne André, Yang Liu, Jun Sun, Jin Song Dong, Shang-Wei Lin
Research Collection School Of Computing and Information Systems
Real-time systems are often hard to control, due to their complicated structures, quantitative time factors and even unknown delays. We present here PSyHCoS, a tool for analyzing parametric real-time systems specified using the hierarchical modeling language PSTCSP. PSyHCoS supports several algorithms for parameter synthesis and model checking, as well as state space reduction techniques. Its architecture favors reusability in terms of syntax, semantics, and algorithms. It comes with a friendly user interface that can be used to edit, simulate and verify PSTCSP models. Experiments show its efficiency and applicability
Mining Direct Antagonistic Communities In Signed Social Networks, David Lo, Didi Surian, Philips Kokoh Prasetyo, Zhang Kuan, Ee Peng Lim
Mining Direct Antagonistic Communities In Signed Social Networks, David Lo, Didi Surian, Philips Kokoh Prasetyo, Zhang Kuan, Ee Peng Lim
Research Collection School Of Computing and Information Systems
Social networks provide a wealth of data to study relationship dynamics among people. Most social networks such as Epinions and Facebook allow users to declare trusts or friendships with other users. Some of them also allow users to declare distrusts or negative relationships. When both positive and negative links co-exist in a network, some interesting community structures can be studied. In this work, we mine Direct Antagonistic Communities (DACs) within such signed networks. Each DAC consists of two sub-communities with positive relationships among members of each sub-community, and negative relationships among members of the other sub-community. Identifying direct antagonistic communities …
Orion: A Software Project Search Engine With Integrated Diverse Software Artifacts, Tegawende F. Bissyande, Ferdian Thung, David Lo, Lingxiao Jiang, Laurent Réveillère
Orion: A Software Project Search Engine With Integrated Diverse Software Artifacts, Tegawende F. Bissyande, Ferdian Thung, David Lo, Lingxiao Jiang, Laurent Réveillère
Research Collection School Of Computing and Information Systems
Software projects produce a wealth of data that is leveraged in different tasks and for different purposes: researchers collect project data for building experimental datasets; software programmers reuse code from projects; developers often explore the opportunities for getting involved in the development of a project to gain or offer expertise. Finding relevant projects that suit one needs is however currently challenging with the capabilities of existing search systems. We propose Orion, an integrated search engine architecture that combines information from different types of software repositories from multiple sources to facilitate the construction and execution of advanced search queries. Orion provides …
The Case For Mobile Forensics Of Private Data Leaks: Towards Large-Scale User-Oriented Privacy Protection, Joseph Joo Keng Chan, Kiat Wee Tan, Lingxiao Jiang, Rajesh Krishna Balan
The Case For Mobile Forensics Of Private Data Leaks: Towards Large-Scale User-Oriented Privacy Protection, Joseph Joo Keng Chan, Kiat Wee Tan, Lingxiao Jiang, Rajesh Krishna Balan
Research Collection School Of Computing and Information Systems
Privacy protection against mobile applications on mobile devices is becoming a serious concern as user sensitive data may be leaked without proper justification. Most current leak detection tools only report leaked private data, but provide inadequate information about the causes of the leaks for end users to take preventive measures. Hence, users often cannot reconcile the way they have used an application to a reported leak — i.e., they are unable to comprehend the (il)legitimacy of the leak or make a decision on whether to allow the leak. This paper aims to demonstrate the feasibility and benefits of identifying the …
An Empirical Study Of Adoption Of Software Testing In Open Source Projects, Pavneet Singh Kochhar, Tegawende F. Bissyande, David Lo, Lingxiao Jiang
An Empirical Study Of Adoption Of Software Testing In Open Source Projects, Pavneet Singh Kochhar, Tegawende F. Bissyande, David Lo, Lingxiao Jiang
Research Collection School Of Computing and Information Systems
No abstract provided.
Shortlisting Top-K Assignments, Yimin Lin, Kyriakos Mouratidis
Shortlisting Top-K Assignments, Yimin Lin, Kyriakos Mouratidis
Research Collection School Of Computing and Information Systems
In this paper we identify a novel query type, the top-K assignment query (αTop-K). Consider a set of objects and a set of suppliers, where each object must be assigned to one supplier. Assume that there is a cost associated with every object-supplier pair. If we allocate each object to the server with the smallest cost (for the specific object), the derived overall assignment will have the minimum total cost. In many scenarios, however, runner-up assignments may be required too, like for example when a decision maker needs to make additional considerations, not captured by individual object-supplier costs. In this …
On The Effect And Remedies Of Shrinkage On Classification Probability Estimation, Zhengxiao Wu, Yufeng Liu, Zhengxiao Wu
On The Effect And Remedies Of Shrinkage On Classification Probability Estimation, Zhengxiao Wu, Yufeng Liu, Zhengxiao Wu
Research Collection School of Economics
Shrinkage methods have been shown to be effective for classification problems. As a form of regularization, shrinkage through penalization helps to avoid overfitting and produces accurate classifiers for prediction, especially when the dimension is relatively high. Despite the benefit of shrinkage on classification accuracy of resulting classifiers, in this article, we demonstrate that shrinkage creates biases on classification probability estimation. In many cases, this bias can be large and consequently yield poor class probability estimation when the sample size is small or moderate. We offer some theoretical insights into the effect of shrinkage and provide remedies for better class probability …
Emphasise Values In The Public Service, Tan K. B. Eugene
Emphasise Values In The Public Service, Tan K. B. Eugene
Research Collection Yong Pung How School Of Law
SMU Associate Professor of Law and Nominated Member of Parliament Eugene Tan highlighted the importance of emphasising values in public service, especially in light of the recent series of high-profile and sensational cases involving public servants. He noted that the emphatic assurances given by political and Public Service leaders after each case - that such misconduct is the exception rather than the norm - may lack convincing power, with the public believing that they are but the tip of the iceberg, with lesser misdemeanours not publicised because they were subjected to internal disciplinary sanctions. Associate Prof Tan questioned whether there …
Combining Model Checking And Testing With An Application To Reliability Prediction And Distribution, Lin Gui, Jun Sun, Yang Liu, Yuanjie Si, Jin Song Dong, Xinyu Wang
Combining Model Checking And Testing With An Application To Reliability Prediction And Distribution, Lin Gui, Jun Sun, Yang Liu, Yuanjie Si, Jin Song Dong, Xinyu Wang
Research Collection School Of Computing and Information Systems
Testing provides a probabilistic assurance of system correctness. In general, testing relies on the assumptions that the system under test is deterministic so that test cases can be sampled. However, a challenge arises when a system under test behaves non-deterministiclly in a dynamic operating environment because it will be unknown how to sample test cases.In this work, we propose a method combining hypothesis testing and probabilistic model checking so as to provide the ``assurance" and quantify the error bounds. The idea is to apply hypothesis testing to deterministic system components and use probabilistic model checking techniques to lift the results …
Mkboost: A Framework Of Multiple Kernel Boosting, Hao Xia, Steven C. H. Hoi
Mkboost: A Framework Of Multiple Kernel Boosting, Hao Xia, Steven C. H. Hoi
Research Collection School Of Computing and Information Systems
Multiple kernel learning (MKL) is a promising family of machine learning algorithms using multiple kernel functions for various challenging data mining tasks. Conventional MKL methods often formulate the problem as an optimization task of learning the optimal combinations of both kernels and classifiers, which usually results in some forms of challenging optimization tasks that are often difficult to be solved. Different from the existing MKL methods, in this paper, we investigate a boosting framework of MKL for classification tasks, i.e., we adopt boosting to solve a variant of MKL problem, which avoids solving the complicated optimization tasks. Specifically, we present …
An Empirical Study Of Adoption Of Software Testing In Open Source Projects, Pavneet Singh Kochhar, Tegawende F. Bissyande, David Lo, Lingxiao Jiang
An Empirical Study Of Adoption Of Software Testing In Open Source Projects, Pavneet Singh Kochhar, Tegawende F. Bissyande, David Lo, Lingxiao Jiang
Research Collection School Of Computing and Information Systems
In software engineering, testing is a crucial activity that is designed to ensure the quality of program code. For this activity, software teams spend substantial resources constructing test cases to thoroughly assess the correctness of software functionality. What is the proportion of open source projects that include test cases? What is the effect of number of developers on the number of test cases? In this study, we explore open source projects and investigate the correlation between the presence of test cases and various project development characteristics, including the number of lines of code, the size of development teams and the …
Heritage-Culture Images Disrupt Immigrants’ Second-Language Processing Through Triggering First-Language Interference, Shu Zhang, Michael W. Morris, Chi-Ying Cheng, Andy J. Yap
Heritage-Culture Images Disrupt Immigrants’ Second-Language Processing Through Triggering First-Language Interference, Shu Zhang, Michael W. Morris, Chi-Ying Cheng, Andy J. Yap
Research Collection School of Social Sciences
For bicultural individuals, visual cues of a setting’s cultural expectations can activate associated representations, switching the frames that guide their judgments. Research suggests that cultural cues may affect judgments through automatic priming, but has yet to investigate consequences for linguistic performance. The present studies investigate the proposal that heritage-culture cues hinder immigrants’ second-language processing by priming first-language structures. For Chinese immigrants in the United States, speaking to a Chinese (vs. Caucasian) face reduced their English fluency, but at the same time increased their social comfort, effects that did not occur for a comparison group of European Americans (study 1). Similarly, …
Revisiting The Multicultural Experience-Creativity Link: The Effects Of Cultural Distance And Comparison Mindset, Chi-Ying Cheng, Angela K. Y. Leung
Revisiting The Multicultural Experience-Creativity Link: The Effects Of Cultural Distance And Comparison Mindset, Chi-Ying Cheng, Angela K. Y. Leung
Research Collection School of Social Sciences
A growing literature provides evidence for the multicultural experience-creativity link such that exposure to the juxtaposition of two cultures facilitates individual creativity. The underlying mechanisms for this relationship, however, are still far from being well explored. Drawing upon the novel perspective of motivated cognition, we hypothesize that two factors interact to affect creative outcomes: (a) perceived cultural distance between the two juxtaposed cultures, and (b) comparison mind-sets. Specifically, we argue that individuals’ creative performance will be increased only when a difference mind-set is employed to process the cultural stimuli that are sufficiently different from each other. In two studies, individuals …
China’S Harmonious World And Post-Western World Orders: Official And Citizen Intellectual Perspectives, William A. Callahan
China’S Harmonious World And Post-Western World Orders: Official And Citizen Intellectual Perspectives, William A. Callahan
Research Collection School of Social Sciences
To explain China’s recent turn from a modest foreign policy to a more assertive global stance, the chapter argues that we need to pay closer attention to how citizen intellectuals are challenging the foreign policy establishment’s monopoly on discussion of China’s place in the world. These new voices emerged as an unintended consequence of President Hu Jintao’s “harmonious world” policy, which created space for citizen intellectuals to talk about new post-western world orders. These official and unofficial sources chart a set of futures ranging from China fitting into the current international system, to China gradually changing international norms, to Beijing …
Gamification Of Education Using Computer Games, Fiona Fui-Hoon Nah, Venkata Telaprolu, Shashank Rallapalli, Pavani R. Venkata
Gamification Of Education Using Computer Games, Fiona Fui-Hoon Nah, Venkata Telaprolu, Shashank Rallapalli, Pavani R. Venkata
Research Collection School Of Computing and Information Systems
We review the literature on gamification and identify principles of gamification and system design elements for gamifying computer educational games. Gamification of education is expected to increase learners’ engagement, which in turn increases learning achievement. We propose a gamification framework that synthesizes findings from the literature. The gamification framework is comprised of principles of gamification, system design elements for gamification, and dimensions of user engagement.
Unified Modeling Language: The Teen Years And Growing Pains, J. Erickson, Keng Siau
Unified Modeling Language: The Teen Years And Growing Pains, J. Erickson, Keng Siau
Research Collection School Of Computing and Information Systems
Unified Modeling Language (UML) is adopted by the Object Management Group as a standardized general-purpose modeling language for object-oriented software engineering. Despite its status as a standard, UML is still in a development stage and many studies have highlighted its weaknesses and challenges - including those related to human factor issues. Further, UML has grown considerably more complex since its inception. This paper traces the history of Unified Modeling Language (UML) from its formation to its current state and discusses the current state of the UML language. The paper first introduces UML and its various diagrams, and discusses its characteristics …
An Empirical Study Of Bugs In Software Build Systems, Xin Xia, Xiaozhen Zhou, David Lo, Xiaoqiong Zhao
An Empirical Study Of Bugs In Software Build Systems, Xin Xia, Xiaozhen Zhou, David Lo, Xiaoqiong Zhao
Research Collection School Of Computing and Information Systems
Build system converts source code, libraries and other data into executable programs by orchestrating the execution of compilers and other tools. The whole building process is managed by a software build system, such as Make, Ant, CMake, Maven, Scons, and QMake. The reliability of software build systems would affect the reliability of the build process. In this paper, we perform an empirical study on bugs in software build systems. We analyze four software build systems, Ant, Maven, CMake and QMake, which are four typical and widely-used software build systems, and can be used to build Java, C, C++ systems. We …
Collective Diffusion Over Networks: Models And Inference, Akshat Kumar, Daniel Sheldon, Biplav Srivastava
Collective Diffusion Over Networks: Models And Inference, Akshat Kumar, Daniel Sheldon, Biplav Srivastava
Research Collection School Of Computing and Information Systems
Diffusion processes in networks are increasingly used to model the spread of information and social influence. In several applications in computational sustainability such as the spread of wildlife, infectious diseases and traffic mobility pattern, the observed data often consists of only aggregate information. In this work, we present new models that generalize standard diffusion processes to such collective settings. We also present optimization based techniques that can accurately learn the underlying dynamics of the given contagion process, including the hidden network structure, by only observing the time a node becomes active and the associated aggregate information. Empirically, our technique is …
The Sustainability Syndicate: Shared Responsibility In A Trans-Organizational Business Model, Sudhi Seshadri
The Sustainability Syndicate: Shared Responsibility In A Trans-Organizational Business Model, Sudhi Seshadri
Research Collection Lee Kong Chian School Of Business
This paper proposes design principles for the ‘sustainability syndicate’: shared responsibility among diverse stakeholders for sustainability; an agenda for unifying economic and ethical rationales; and plural governance based primarily on markets, contracts and collaborative relationships. The paper suggests a research agenda directed at issues that constrain sustainability syndicates. Syndication's contributions to sustainability build upon its trans-organizational structures for shared responsibility. Syndication works as an insurance cooperative that reduces the financial burden of risk. In addition, members could rent skill sets from other stakeholders, reduce barriers to entry into bigger projects, and improve efficiencies. As underlying sustainability are both economic and …
When A Subsidiary Loses Its Status: Towards An Identification-Based Model Of Host Country Nationals' Willingness To Share Knowledge With Expatriates, Sachiko Yamao, Toru Yoshikawa
When A Subsidiary Loses Its Status: Towards An Identification-Based Model Of Host Country Nationals' Willingness To Share Knowledge With Expatriates, Sachiko Yamao, Toru Yoshikawa
Research Collection Lee Kong Chian School Of Business
We theorize how a foreign subsidiary’s loss of its status relative to other units of the same multinational corporation (MNC) will influence host country national (HCN) managers’ dual organizational identification and their willingness to share knowledge with expatriate managers. In particular, we examine the two contingent scenarios of subsidiary status loss (i.e., the parent-driven and subsidiary-engaged) that may lead HCN managers to develop different organizational identification (i.e., MNC-oriented and subsidiary-oriented). We then propose that different organizational identification of HCN managers will lead them to develop varying levels of willingness to share knowledge with expatriates. We further propose that HCN managers’ …
How Capital Structure Influences Diversification Performance: A Transaction Cost Perspective, Jonathan O'Brien, Parthiban David, Toru Yoshikawa, Andrew Delios
How Capital Structure Influences Diversification Performance: A Transaction Cost Perspective, Jonathan O'Brien, Parthiban David, Toru Yoshikawa, Andrew Delios
Research Collection Lee Kong Chian School Of Business
Extant theories agree that debt should inhibit diversification, but predict opposing performance consequences. While agency theory predicts that debt should lead to higher performance for diversifying firms, transaction cost economics (TCE) predicts that more debt will lead to lower performance for firms expanding into new markets. Our empirical tests on a large sample of Japanese firms support TCE by showing that firms accrue higher returns from leveraging their resources and capabilities into new markets when managers are shielded from the rigors of the market governance of debt, particularly bond debt. Furthermore, we find that the detrimental effects of debt are …
Personality Across Working Life: The Longitudinal And Reciprocal Influences Of Personality On Work, Stephen A. Woods, Filip Lievens, Filip De Fruyt, Bart Wille
Personality Across Working Life: The Longitudinal And Reciprocal Influences Of Personality On Work, Stephen A. Woods, Filip Lievens, Filip De Fruyt, Bart Wille
Research Collection Lee Kong Chian School Of Business
Duplicate record, see https://ink.library.smu.edu.sg/lkcsb_research/5709/. This paper focuses on the role of personality at different stages of people's working lives. We begin by reviewing the research in industrial, work, and organizational (IWO) psychology regarding the longitudinal and dynamic influences of personality as an independent variable at different career stages, structuring our review around a framework of people's working lives and careers over time. Next, we review recent studies in the personality and developmental psychology domain regarding the influence of changing life roles on personality. In this domain, personality also serves as a dependent variable. By blending these two domains, it …
Acquisitions Driven By Stock Overvaluation: Are They Good Deals?, Fangjian Fu, Leming Lin, Micah Officer
Acquisitions Driven By Stock Overvaluation: Are They Good Deals?, Fangjian Fu, Leming Lin, Micah Officer
Research Collection Lee Kong Chian School Of Business
Theory and recent evidence suggest that overvalued firms can create value for shareholders if they exploit their overvaluation by using their stock as currency to purchase less overvalued firms. We challenge this idea and show that, in practice, overvalued acquirers significantly overpay for their targets. These acquisitions do not, in turn, lead to synergy gains. Moreover, these acquisitions seem to be concentrated among acquirers with the largest governance problems. CEO compensation, not shareholder value creation, appears to be the main motive behind acquisitions by overvalued acquirers.
Keystroke Timing Analysis Of On-The-Fly Web Apps, Chee Meng Tey, Payas Gupta, Debin Gao, Yan Zhang
Keystroke Timing Analysis Of On-The-Fly Web Apps, Chee Meng Tey, Payas Gupta, Debin Gao, Yan Zhang
Research Collection School Of Computing and Information Systems
The Google Suggestions service used in Google Search is one example of an interactivity rich Javascript application. In this paper, we analyse the timing side channel of Google Suggestions by reverse engineering the communication model from obfuscated Javascript code. We consider an attacker who attempts to infer the typing pattern of a victim. From our experiments involving 11 participants, we found that for each keypair with at least 20 samples, the mean of the inter-keystroke timing can be determined with an error of less than 20%.
When The Brands Fail, Singapore Management University
When The Brands Fail, Singapore Management University
Perspectives@SMU
Good branding can help companies, but it can inflict serious damage when things go wrong
Compliant Sinners, Obstinate Saints: How Power And Self-Focus Determine The Effectiveness Of Social Influences In Ethical Decision Making, Marko Pitesa, Stefan Thau
Compliant Sinners, Obstinate Saints: How Power And Self-Focus Determine The Effectiveness Of Social Influences In Ethical Decision Making, Marko Pitesa, Stefan Thau
Research Collection Lee Kong Chian School Of Business
In this research, we examine when and why organizational environments influence how employees respond to moral issues. Past research has proposed that social influences in organizations affect employees' ethical decision making, but has not explained when and why some individuals are affected by an organizational environment and some disregard it. To address this problem, we drew on research on power to propose that power makes people more self-focused, which, in turn, makes them more likely to act upon their preferences and ignore (un)ethical social influences. Using both experimental and field methods, we tested our model across the three main paradigms …
Anomaly Detection On Social Data, Hanbo Dai
Anomaly Detection On Social Data, Hanbo Dai
Dissertations and Theses Collection (Open Access)
The advent of online social media including Facebook, Twitter, Flickr and Youtube has drawn massive attention in recent years. These online platforms generate massive data capturing the behavior of multiple types of human actors as they interact with one another and with resources such as pictures, books and videos. Unfortunately, the openness of these platforms often leaves them highly susceptible to abuse by suspicious entities such as spammers. It therefore becomes increasingly important to automatically identify these suspicious entities and eliminate their threats. We call these suspicious entities anomalies in social data, as they often hold different agenda comparing to …
Accounting Restatements And External Financing Choices, Xia Chen, Qiang Cheng, Alvis Lo
Accounting Restatements And External Financing Choices, Xia Chen, Qiang Cheng, Alvis Lo
Research Collection School Of Accountancy
There is little research on how accounting information quality affects a firm’s external financing choices. In this paper, we use the occurrence of accounting restatements as a proxy for the reduced credibility of accounting information and investigate how restatements affect a firm’s external financing choices. We find that for firms that obtain external financing after restatements, they rely more on debt financing, especially private debt financing, and less on equity financing. The increase in debt financing is more pronounced for firms with more severe information problems and less pronounced for firms with prompt CEO/CFO turnover and auditor dismissal. Our evidence …