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Crowd Documentation: Exploring The Coverage And The Dynamics Of Api Discussions On Stack Overflow, Chris Parnin, Christoph Treude, Lars Grammel, Margaret-Anne Storey Jan 2012

Crowd Documentation: Exploring The Coverage And The Dynamics Of Api Discussions On Stack Overflow, Chris Parnin, Christoph Treude, Lars Grammel, Margaret-Anne Storey

Research Collection School Of Computing and Information Systems

Traditionally, many types of software documentation, such as API documentation, require a process where a few people write for many potential users. The resulting documentation, when it exists, is often of poor quality and lacks sufficient examples and explanations. In this paper, we report on an empirical study to investigate how Question and Answer (Q&A) websites, such as Stack Overflow, facilitate crowd documentation — knowledge that is written by many and read by many. We examine the crowd documentation for three popular APIs: Android, GWT, and the Java programming language. We collect usage data using Google Code Search, and analyze …


A Hybridized Lagrangian Relaxation And Simulated Annealing Method For The Course Timetabling Problem, Aldy Gunawan, Kim Leng Poh Jan 2012

A Hybridized Lagrangian Relaxation And Simulated Annealing Method For The Course Timetabling Problem, Aldy Gunawan, Kim Leng Poh

Research Collection School Of Computing and Information Systems

This paper describes a timetabling problem at universities, where a master course timetable is given extrinsically and conflicts due to students' course enrollment do not need to be considered. A solver for the problem, which integrates both teacher assignment and course scheduling, is described. An initial solution is obtained by a mathematical programming approach based on Lagrangian relaxation. This solution is further improved by a simulated annealing algorithm. The proposed method has been tested on instances from a university in Indonesia, as well as on several randomly generated datasets, and the corresponding computational results are reported.


Simultaneous Camera Pose And Correspondence Estimation With Motion Coherence, Wen-Yan Lin, Loong-Fah Cheong, Ping Tan, Guo Dong, Siying Liu Jan 2012

Simultaneous Camera Pose And Correspondence Estimation With Motion Coherence, Wen-Yan Lin, Loong-Fah Cheong, Ping Tan, Guo Dong, Siying Liu

Research Collection School Of Computing and Information Systems

Traditionally, the camera pose recovery problem has been formulated as one of estimating the optimal camera pose given a set of point correspondences. This critically depends on the accuracy of the point correspondences and would have problems in dealing with ambiguous features such as edge contours and high visual clutter. Joint estimation of camera pose and correspondence attempts to improve performance by explicitly acknowledging the chicken and egg nature of the pose and correspondence problem. However, such joint approaches for the two-view problem are still few and even then, they face problems when scenes contain largely edge cues with few …


Dynamic Secure Cloud Storage With Provenance, Sherman S. M. Chow, Cheng-Kang Chu, Xinyi Huang, Jianying Zhou, Robert H. Deng Jan 2012

Dynamic Secure Cloud Storage With Provenance, Sherman S. M. Chow, Cheng-Kang Chu, Xinyi Huang, Jianying Zhou, Robert H. Deng

Research Collection School Of Computing and Information Systems

One concern in using cloud storage is that the sensitive data should be confidential to the servers which are outside the trust domain of data owners. Another issue is that the user may want to preserve his/her anonymity in the sharing or accessing of the data (such as in Web 2.0 applications). To fully enjoy the benefits of cloud storage, we need a confidential data sharing mechanism which is fine-grained (one can specify who can access which classes of his/her encrypted files), dynamic (the total number of users is not fixed in the setup, and any new user can decrypt …


National Accounts Of Well-Being, Ed Diener, William Tov Jan 2012

National Accounts Of Well-Being, Ed Diener, William Tov

Research Collection School of Social Sciences

National accounts of subjective well-being should be used to assess the various facets of citizen’s well-being such as life satisfaction, trust in others, positive emotions, meaning and purpose in life, and engagement and interest. Although economic indicators have reigned within policy debates, the purpose of the economic indicators is ultimately to enhance “happiness”—subjective well-being. National measures of well-being that are collected systematically at periodic intervals will not only help focus attention on wellbeing as a major goal of societies, but can give information to leaders about policy alternatives, and thus inform policy debates in a way that complements economic analyses. …


Beyond Minority Report: Pre-Crime, Pre-Punishment And Pre-Desert, John N. Williams Jan 2012

Beyond Minority Report: Pre-Crime, Pre-Punishment And Pre-Desert, John N. Williams

Research Collection School of Social Sciences

Utilitarian ethics are apparently incommensurable with other ethical perspectives. Faced with a choice between maximizing general benefit to society and committing an act of injustice, those of us who reject utility in favor of justice are powerless to change the viewpoint of someone who rejects justice in favor of utility. Since there are no higher ethical principles that overarch both principles of utility and principles of justice, both sides must run out of reasons when deciding which principles should be put first. But the unreasoned decision is ineluctable, because there are possible cases in which the principles conflict.1 This kind …


Cultural Construction Of Success And Epistemic Motives Moderate American-Chinese Differences In Reward Allocation Biases, Angela K. Y. Leung, Young-Hoon Kim, Zhi-Xue Zhang, Kim-Pong Tam, Chi-Yue Chiu Jan 2012

Cultural Construction Of Success And Epistemic Motives Moderate American-Chinese Differences In Reward Allocation Biases, Angela K. Y. Leung, Young-Hoon Kim, Zhi-Xue Zhang, Kim-Pong Tam, Chi-Yue Chiu

Research Collection School of Social Sciences

When the relative contribution of the self and the group to a group success is unclear, Americans tend to exhibit a self-serving bias (rewarding the self more than what the self deserves), whereas the Chinese tend to exhibit an other-serving bias (rewarding the group more than the group deserves). In a study comparing the reward allocation biases of Americans and Chinese in different group outcome conditions, the authors showed that the abovementioned cultural difference is found (a) only for culturally congruent success experience (attaining approach goals for Americans and avoidance goals for Chinese) and (b) among individuals who are motivated …


Out Of Sight, Out Of Mind: The Value Of Political Connections In Social Networks, Quoc-Anh Do, Bang Dang Nguyen, Yen Teik Lee, Kieu-Trang Nguyen Dec 2011

Out Of Sight, Out Of Mind: The Value Of Political Connections In Social Networks, Quoc-Anh Do, Bang Dang Nguyen, Yen Teik Lee, Kieu-Trang Nguyen

Research Collection School Of Economics

This paper investigates the impact of social-network connections to politicians on firm value. We focus on the networks of university classmates and alumni among directors of U.S. public firms and congressmen. Using the Regression Discontinuity Design based on close elections from 2000 to 2008, we identify that a director’s connection to an elected congressman causes a Weighted Average Treatment Effect on Cumulative Abnormal Returns of -2.65% surrounding the election date. The effect is robust and consistent through various specifications, parametric and nonparametric, with different outcome measures and social network definitions, and across many subsamples. We find evidence to support the …


Modeling Multichannel Home Video Demand In The U.S. Motion Picture Industry, Anirban Mukherjee, Vrinda Kadiyali Dec 2011

Modeling Multichannel Home Video Demand In The U.S. Motion Picture Industry, Anirban Mukherjee, Vrinda Kadiyali

Research Collection Lee Kong Chian School Of Business

The U.S. motion picture industry has become increasingly reliant on posttheatrical channel profits. Two often-cited drivers of these profits are cross-channel substitution among posttheatrical channels and seasonality in consumer preferences for any movie. The authors use a differentiated products version of the multiplicative competitive interaction model to investigate these two phenomena. They estimate the model using data from 2000 and 2001 on two posttheatrical channels in the U.S. market: purchase and rental home viewing channels. Contrary to expectations based on business press commentary, after controlling for seasonality and movie attributes, the authors find low cross-channel price and availability elasticity for …


Dealing With The Threats Inherent In Unproctored Internet Testing Of Cognitive Ability: Results From A Large-Scale Operational Test Program, Filip Lievens, Eugene Burke Dec 2011

Dealing With The Threats Inherent In Unproctored Internet Testing Of Cognitive Ability: Results From A Large-Scale Operational Test Program, Filip Lievens, Eugene Burke

Research Collection Lee Kong Chian School Of Business

There is little information available about operational systems of unproctored Internet testing (UIT) of cognitive ability and how they deal with the threats inherent in UIT. This descriptive study provides a much-needed empirical examination of a large-scale operational UIT system of cognitive ability that implemented test design and verification testing for increasing test security and honest responding. Test security evaluations showed item exposure and test overlap rates were acceptable. Aberrant score evaluations revealed that negative score change (higher unproctored scores than proctored ones) was negligible. Implications for UIT research are discussed.


Four-Jet Final State Production In E+E- Collisions At Centre-Of-Mass Energies Of 130 And 136 Gev, D. Buskulic, M. Thulasidas Dec 2011

Four-Jet Final State Production In E+E- Collisions At Centre-Of-Mass Energies Of 130 And 136 Gev, D. Buskulic, M. Thulasidas

Research Collection School Of Computing and Information Systems

The four-jet final state is analyzed to search for hadronic decays of pair-produced heavy particles. The analysis uses the ALEPH data collected at LEP in November 1995 at centre-of-mass energies of 130 and 136 GeV, corresponding to a total integrated luminosity of 5.7 pb1 . An excess of four-jet events is observed with respect to the standard model predictions. In addition, these events exhibit an enhancement in the sum of the two di-jet masses around 105 GeV/c 2 . The properties of these events are studied and compared to the expectations from standard processes and to pair production hypotheses


Content Contribution Under Revenue Sharing And Reputation Concern In Social Media: The Case Of Youtube, Qian Tang, Bin Gu, Andrew B. Whinston Dec 2011

Content Contribution Under Revenue Sharing And Reputation Concern In Social Media: The Case Of Youtube, Qian Tang, Bin Gu, Andrew B. Whinston

Research Collection School Of Computing and Information Systems

A key feature of social media is that it allows individuals and businesses to contribute contents for public viewing. However, little is known about how content providers derive payoffs from such activities. In this study, we build a dynamic structural model to recover the utility function for content providers. Our model distinguishes short-term payoffs based on ad revenue sharing from long-term payoffs driven by content providers’ reputation. The model was estimated using a panel data of 914 top 1000 providers and 381 randomly selected providers on YouTube from Jun 7th, 2010, to Aug 7th, 2011. The two different sets of …


An Effective Approach For Topicspecific Opinion Summarization, Binyang Li, Lanjun Zhou, Wei Gao, Kam-Fai Wong, Zhongyu Wei Dec 2011

An Effective Approach For Topicspecific Opinion Summarization, Binyang Li, Lanjun Zhou, Wei Gao, Kam-Fai Wong, Zhongyu Wei

Research Collection School Of Computing and Information Systems

Topic-specific opinion summarization (TOS) plays an important role in helping users digest online opinions, which targets to extract a summary of opinion expressions specified by a query, i.e. topic-specific opinionated information (TOI). A fundamental problem in TOS is how to effectively represent the TOI of an opinion so that salient opinions can be summarized to meet user’s preference. Existing approaches for TOS are either limited by the mismatch between topic-specific information and its corresponding opinionated information or lack of ability to measure opinionated information associated with different topics, which in turn affect the performance seriously. In this paper, we represent …


Validation Of A Model Of Information Systems User Competency, Brenda Eschenbrenner, Fiona Fui-Hoon Nah Dec 2011

Validation Of A Model Of Information Systems User Competency, Brenda Eschenbrenner, Fiona Fui-Hoon Nah

Research Collection School Of Computing and Information Systems

IS user competency, or the ability to realize the fullest potential and the greatest performance from IS use, is important for IS users. However, which factors contribute to IS user competency is unclear. Based on the findings of previous research, a model of IS user competency was developed that focuses on IS-specific characteristics: (i) domain knowledge of and skills in IS, (ii) willingness to try and to explore IS, and (iii) capability of perceiving IS value. The model was validated using the survey approach and the findings suggest that all three factors are pivotal to IS user competency, with willingness …


Ancient Chinese Power, Modern Chinese Thought, Linsay Cunningham-Cross, William A. Callahan Dec 2011

Ancient Chinese Power, Modern Chinese Thought, Linsay Cunningham-Cross, William A. Callahan

Research Collection School of Social Sciences

Ancient Chinese Thought, Modern Chinese Power is the latest publication to come from Yan Xuetong's ongoing research project that explores the interstate political philosophy of China's pre-Qin era. This book is interesting on many levels, and has already drawn attention from public intellectuals and scholars in the West. This essay thus first will examine the scholarly issue of how Yan and his colleagues are employing pre-Qin thought to make philosophical and political arguments about how China will rise. It will consider the relation of the ‘kingly way’ (wang 王) and the ‘hegemonic way’ (ba 霸) to critically analyze Yan's argument …


Social Networks And The Desire To Save Face: A Case From Singapore, Michael A. Netzley, Akanksha Rath Dec 2011

Social Networks And The Desire To Save Face: A Case From Singapore, Michael A. Netzley, Akanksha Rath

Research Collection Lee Kong Chian School Of Business

For five years, corporate communication undergraduates have maintained a wiki as a final course and community service project. Using Web 2.0 platforms to crowdsource and curate content, they learn to employ online communications for work purposes. When the course was launched in 2007, the dominant social media narrative invited educators to embrace a technological optimism with sub-themes of open communication, sharing, and co-creation. By 2011, student feedback had compelled the instructor to consider the limits of technological optimism and revise the course. Specifically, Singaporean students have displayed a need to save face online, which has led to a localized teaching …


Going Beyond The Multicultural Experience-Creativity Link: The Mediating Role Of Emotions, Chi-Ying Cheng, Angela K. Y. Leung, Tsung-Yu Wu Dec 2011

Going Beyond The Multicultural Experience-Creativity Link: The Mediating Role Of Emotions, Chi-Ying Cheng, Angela K. Y. Leung, Tsung-Yu Wu

Research Collection School of Social Sciences

This research examines the mediating role of emotions implicated in the multicultural experience—creativity link. We propose that when individuals are dealing with apparent cultural contradictions upon encountering two cultures simultaneously, mentally juxtaposing dissonant cultural stimuli could lower positive affect or increase negative affect, which could in turn induce a deeper level of cognitive processing of cultural discrepancies and inspire creativity. Two studies compared dual cultural exposure versus single cultural exposure among bicultural Singaporeans (Study 1) and compared self-relevant (jointly presenting local and foreign cultures) versus self-irrelevant (jointly presenting foreign cultures only) dual cultural exposure among monocultural Taiwanese (Study 2). As …


The Valuation Of User-Generated Content: A Structural, Stylistic And Semantic Analysis Of Online Reviews, Noi Sian Koh Dec 2011

The Valuation Of User-Generated Content: A Structural, Stylistic And Semantic Analysis Of Online Reviews, Noi Sian Koh

Dissertations and Theses Collection (Open Access)

The ability and ease for users to create and publish content has provided vast amount of online product reviews. However, the amount of data is overwhelmingly large and unstructured, making information difficult to quantify. This creates challenge in understanding how online reviews affect consumers’ purchase decisions. In my dissertation, I explore the structural, stylistic and semantic content of online reviews. Firstly, I present a measurement that quantifies sentiments with respect to a multi-point scale and conduct a systematic study on the impact of online reviews on product sales. Using the sentiment metrics generated, I estimate the weight that customers place …


Score Tests For Inverse Gaussian Mixtures, A. F. Desmond, Zhenlin Yang Dec 2011

Score Tests For Inverse Gaussian Mixtures, A. F. Desmond, Zhenlin Yang

Research Collection School Of Economics

The mixed inverse Gaussian given by Whitmore (Scand. J. Statist., 13, 1986, 211–220) provides a convenient way for testing the goodness-of-fit of a pure inverse Gaussian distribution. The test is a one-sided score test with the null hypothesis being the pure inverse Gaussian (i.e. the mixing parameter is zero) and the alternative a mixture. We devise a simple score test and study its finite sample properties. Monte Carlo results show that it compares favourably with the smooth test of Ducharme (Test, 10, 2001, 271-290). In practical applications, when the pure inverse Gaussian distribution is rejected, one is interested in making …


Singapore Consumer’S Inflation Expectations And Creation Of Singapore Index Of Inflation Expectations, Aurobindo Ghosh, Jun Yu Dec 2011

Singapore Consumer’S Inflation Expectations And Creation Of Singapore Index Of Inflation Expectations, Aurobindo Ghosh, Jun Yu

Research Collection School Of Economics

The aim of this report is to highlight a broad spectrum of issues that brings about the measurement of the disagreement and the uncertainity and the formation of inflation expectations among economic agents in Singapore.


Uniform Asymptotic Normality In Stationary And Unit Root Autoregression, Chirok Han, Peter C. B. Phillips, Donggyu Sul Dec 2011

Uniform Asymptotic Normality In Stationary And Unit Root Autoregression, Chirok Han, Peter C. B. Phillips, Donggyu Sul

Research Collection School Of Economics

While differencing transformations can eliminate nonstationarity, they typically reduce signal strength and correspondingly reduce rates of convergence in unit root autoregressions. The present paper shows that aggregating moment conditions that are formulated in differences provides an orderly mechanism for preserving information and signal strength in autoregressions with some very desirable properties. In first order autoregression, a partially aggregated estimator based on moment conditions in differences is shown to have a limiting normal distribution that holds uniformly in the autoregressive coefficient rho, including stationary and unit root cases. The rate of convergence is root n when vertical bar rho vertical bar < 1 and the limit distribution is the same as the Gaussian maximum likelihood estimator (MLE), but when rho = 1 the rate of convergence to the normal distribution is within a slowly varying factor of n. A fully aggregated estimator (FAE) is shown to have the same limit behavior in the stationary case and to have nonstandard limit distributions in unit root and near integrated cases, which reduce both the bias and the variance of the MLE. This result shows that it is possible to improve on the asymptotic behavior of the MLE without using an artificial shrinkage technique or otherwise accelerating convergence at unity at the cost of performance in the neighborhood of unity. Confidence intervals constructed from the FAE using local asymptotic theory around unity also lead to improvements over the MLE.


Vireo@Trecvid 2011: Instance Search, Semantic Indexing, Multimedia Event Detection And Known-Item Search, Chong-Wah Ngo, Shi-Ai Zhu, Wei Zhang, Chun-Chet Tan, Ting Yao, Lei Pang, Hung-Khoon Tan Dec 2011

Vireo@Trecvid 2011: Instance Search, Semantic Indexing, Multimedia Event Detection And Known-Item Search, Chong-Wah Ngo, Shi-Ai Zhu, Wei Zhang, Chun-Chet Tan, Ting Yao, Lei Pang, Hung-Khoon Tan

Research Collection School Of Computing and Information Systems

The vireo group participated in four tasks: instance search, semantic indexing, multimedia event detection and known-item search. In this paper,we will present our approaches and discuss the evaluation results.


Power Maximization And Size Control Of Heteroscedasticity And Autocorrelation Robust Tests With Exponentiated Kernels, Yixiao Sun, Peter C. B. Phillips, Sainan Jin Dec 2011

Power Maximization And Size Control Of Heteroscedasticity And Autocorrelation Robust Tests With Exponentiated Kernels, Yixiao Sun, Peter C. B. Phillips, Sainan Jin

Research Collection School Of Economics

Using the power kernels of Phillips, Sun, and Jin (2006, 2007), we examine the large sample asymptotic properties of the t-test for different choices of power parameter (ρ). We show that the nonstandard fixed-ρ limit distributions of the t-statistic provide more accurate approximations to the finite sample distributions than the conventional large-ρ limit distribution. We prove that the second-order corrected critical value based on an asymptotic expansion of the nonstandard limit distribution is also second-order correct under the large-ρ asymptotics. As a further contribution, we propose a new practical procedure for selecting the test-optimal power parameter that addresses the central …


A Simple And Robust Method Of Inference For Spatial Lag Dependence, Zhenlin Yang, Yan Shen Dec 2011

A Simple And Robust Method Of Inference For Spatial Lag Dependence, Zhenlin Yang, Yan Shen

Research Collection School Of Economics

A simple and reliable method of inference for the spatial parameter in spatial autoregressive models is introduced, based on a statistic obtained by centering and rescaling the numerator of the concentrated Gaussian score function. The resulted tests and confidence intervals are robust against the distributional misspecifications and are insensitive to the spatial layouts and the error standard deviation. In contrast, the standard methods based on Gaussian score and information matrix may lead to inconsistent inference when errors are non normal, and can be quite sensitive to the spatial layouts and the error standard deviation even when errors are normally distributed. …


Investment Treaty Disputes: Ideological Fault Lines And An Evolving Zeitgeist, Locknie Hsu Dec 2011

Investment Treaty Disputes: Ideological Fault Lines And An Evolving Zeitgeist, Locknie Hsu

Research Collection Yong Pung How School Of Law

The zeitgeist of the 21st century in the field of investment treaty arbitrations comprises a rise in the number of such arbitrations and accompanying observations on the unwieldy jurisprudential effects of such a rise. The international investment arbitration community is alive with discussion over these effects, which discussion includes an examination of the value of prior awards as precedents.' The existing regime based on treaty interpretation clearly provides no formal system of precedent and the 'players' (read: arbitrators) change from dispute to dispute as investment arbitration tribunals do not fall within a single, neat judicial hierarchical system. With the number …


Revisiting The Similar Fact Rule In Singapore: Public Prosecutor V. Mas Swan Bin Adnan And Another, Siyuan Chen Dec 2011

Revisiting The Similar Fact Rule In Singapore: Public Prosecutor V. Mas Swan Bin Adnan And Another, Siyuan Chen

Research Collection Yong Pung How School Of Law

The similar fact rule in Singapore—as with the law on any evidence law doctrine that can be found in both our Evidence Act and the common law—has required clarification for some time. This note, which discusses the latest local decision on the similar fact rule, considers if that decision is compatible with the Evidence Act and the various conceptualisations underlying the doctrine.


The Judicial Duty To Give Reasons: Thong Ah Fat V Public Prosecutor [2011] Sgca 65, Siyuan Chen Dec 2011

The Judicial Duty To Give Reasons: Thong Ah Fat V Public Prosecutor [2011] Sgca 65, Siyuan Chen

Research Collection Yong Pung How School Of Law

The accused was charged under the Misuse of Drugs Act after being found with 142.41 grams of diamorphine at the Woodlands Checkpoint. The High Court Judge found the accused guilty and sentenced him to death in a brief judgment of five paragraphs. The Court of Appeal, however, ordered a retrial as it was of the view that the Judge’s reasoning was “unclear” and the “judicial duty to give reasoned decisions” was not discharged


Google’S China Problem: A Case Study On Trade, Technology And Human Rights Under The Gats, Henry S. Gao Dec 2011

Google’S China Problem: A Case Study On Trade, Technology And Human Rights Under The Gats, Henry S. Gao

Research Collection Yong Pung How School Of Law

Trade and human rights have long had a troubled relationship. The advent of new technologies such as internet further complicates the relationship. This article reviews the relationship between trade, technology and human rights in light of the recent dispute between Google and China from both theoretical and practical perspectives. Starting with an overview of the internet censorship regime in China, the article goes on to assess the legal merits of a WTO challenge in this case. First, the article discusses which service sector or subsectors might be at issue. Second, the article analyzes whether and to what extent China has …


On The Pooling Of Positive Examples With Ontology For Visual Concept Learning, Shiai Zhu, Chong-Wah Ngo, Yu-Gang Jiang Dec 2011

On The Pooling Of Positive Examples With Ontology For Visual Concept Learning, Shiai Zhu, Chong-Wah Ngo, Yu-Gang Jiang

Research Collection School Of Computing and Information Systems

A common obstacle in effective learning of visual concept classifiers is the scarcity of positive training examples due to expensive labeling cost. This paper explores the sampling of weakly tagged web images for concept learning without human assistance. In particular, ontology knowledge is incorporated for semantic pooling of positive examples from ontologically neighboring concepts. This effectively widens the coverage of the positive samples with visually more diversified content, which is important for learning a good concept classifier. We experiment with two learning strategies: aggregate and incremental. The former strategy re-trains a new classifier by combining existing and newly collected examples, …


Case Study On Using A Programming Practice Tool For Evaluating University Applicants, Shannon Christopher Boesch, Kevin Steppe Dec 2011

Case Study On Using A Programming Practice Tool For Evaluating University Applicants, Shannon Christopher Boesch, Kevin Steppe

Research Collection School Of Computing and Information Systems

We used a programming practice tool to test basic programming skills of prospective students. A live competition was used to test those skills. Students who did well were asked for further interviews. Most students had no prior background and reported learning the basics of two programming languages within two weeks of self-study.