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Remote Attestation On Function Execution, Liang Gu, Yueqiang Cheng, Xuhua Ding, Robert H. Deng, Yao Guo, Weizhong Shao Jan 2010

Remote Attestation On Function Execution, Liang Gu, Yueqiang Cheng, Xuhua Ding, Robert H. Deng, Yao Guo, Weizhong Shao

Research Collection School Of Computing and Information Systems

Remote attestation provides the basis for one platform to establish trusts on another. In this paper, we consider the problem of attesting the correctness of program executions. We propose to measure the target program and all the objects it depends on, with an assumption that the Secure Kernel and the Trusted Platform Module provide a secure execution environment through process separation. The attestation of the target program begins with a program analysis on the source code or the binary code in order to find out the relevant executables and data objects. Whenever such a data object is accessed or a …

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On The Potential Of Limitation-Oriented Malware Detection And Prevention Techniques On Mobile Phones, Qiang Yan, Robert H. Deng, Yingjiu Li, Tieyan Li Jan 2010

On The Potential Of Limitation-Oriented Malware Detection And Prevention Techniques On Mobile Phones, Qiang Yan, Robert H. Deng, Yingjiu Li, Tieyan Li

Research Collection School Of Computing and Information Systems

The malware threat for mobile phones is expected to increase with the functionality enhancement of mobile phones. This threat is exacerbated with the surge in population of smart phones instilled with stable Internet access which provides attractive targets for malware developers. Prior research on malware protection has focused on avoiding the negative impact of the functionality limitations of mobile phones to keep the performance cost within the limitations of mobile phones. Being different, this paper investigates the positive impact of these limitations on suppressing the development of mobile malware. We study the state-of-the-art mobile malware, as well as the progress …

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Do Analyst Earnings Beta Explain Growth Anomaly?, Sophie Phuong Thanh Doan Jan 2010

Do Analyst Earnings Beta Explain Growth Anomaly?, Sophie Phuong Thanh Doan

Dissertations and Theses Collection (Open Access)

Using a measure of cashflow risk derived from analyst forecasts, I find that cashflow risk offers a partial explanation for the value – growth anomaly. In particular, the lowest asset growth portfolio has a higher earnings beta than the highest asset growth portfolio. Approximately cashflow risk measured by earnings beta carries a significant positive risk premium of 1.24% with a t-value of 3.51.

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Workshop Report From Web2se: First Workshop On Web 2.0 For Software Engineering, Christoph Treude, Margaret-Anne Storey, Kate Ehrlich, Arie Van Deursen Jan 2010

Workshop Report From Web2se: First Workshop On Web 2.0 For Software Engineering, Christoph Treude, Margaret-Anne Storey, Kate Ehrlich, Arie Van Deursen

Research Collection School Of Computing and Information Systems

Web 2.0 technologies such as wikis, blogs, tags and feeds have been adopted and adapted by software engineers. With Web2SE, we provide a venue for pertinent work by highlighting current state-of-the-art research, by identifying research areas, and by discussing implications of Web 2.0 on software engineering. This paper reports on the paper presentations and the discussions among participants at Web2SE 2010 as well as on future directions of the Web2SE community.

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Periodic Resource Reallocation In Two-Echelon Repairable Item Inventory Systems, Hoong Chuin Lau, Jie Pan, Huawei Song Jan 2010

Periodic Resource Reallocation In Two-Echelon Repairable Item Inventory Systems, Hoong Chuin Lau, Jie Pan, Huawei Song

Research Collection School Of Computing and Information Systems

Given an existing stock allocation in an inventory system, it is often necessary to perform reallocation over multiple time points to address inventory imbalance and maximize availability. In this paper, we focus on the situation where there are two opportunities to perform reallocation within a replenishment cycle. We derive a mathematical model to determine when and how to perform reallocation. Furthermore, we consider the extension of this model to the situation allowing an arbitrary number of reallocations. Experimental results show that the two-reallocation approach achieves better performance compared with the single-reallocation approach found in the literature. We also illustrate how …

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Tunneling As An Incentive For Earnings Management During The Ipo Process In China, Jiwei Wang, Joseph Aharony, Hongqi Yuan Jan 2010

Tunneling As An Incentive For Earnings Management During The Ipo Process In China, Jiwei Wang, Joseph Aharony, Hongqi Yuan

Research Collection School Of Accountancy

Using a sample of 185 Chinese IPO firms listed on the Shanghai Stock Exchange during the period 1999-2001, we show that related-party (RP) sales of goods and services could be used opportunistically to manage earnings upwards in the pre-IPO period. We also provide evidence that such behavior may be motivated by the prospect of tunneling opportunities in the post-IPO period, i.e., exploiting economic resources from minority shareholders for the benefit of the parent company. We provide evidence of one such opportunistic tunneling tool: non-repayment by Chinese parent companies of net outstanding corporate loans made to them by their newly listed …

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A Review Of The Professionalization Of The Software Industry: Has It Made Software Engineering A Real Profession?, Heng Ngee Mok Jan 2010

A Review Of The Professionalization Of The Software Industry: Has It Made Software Engineering A Real Profession?, Heng Ngee Mok

Research Collection School Of Computing and Information Systems

Every industry strives to be called a "profession", and software engineering is no exception. This paper attempts to define "profession" from three different perspectives and provides a chronological narration of the professionalization efforts of major IT bodies such as the IEEE Computer Society, Association of Computing Machinery and British Computer Society to promote software engineering from "occupation" to "profession". The outcome of this professionalization process is then examined against the three vastly different definitions of "profession" to qualitatively gauge the success of the professionalization process.

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Affectivity And The Nature Of The Sage: Gleanings From A Tang Daoist Master, Alan Kam Leung Chan Jan 2010

Affectivity And The Nature Of The Sage: Gleanings From A Tang Daoist Master, Alan Kam Leung Chan

Research Collection College of Integrative Studies

This essay explores the place of qing in conceptions of the nature and being of the sage, focusing on the Tang Daoist master Wu Yun. What it seeks to show is that assumptions about the attainability of “sagehood” and the “nature” (xing) of human beings inform the interpretation of qing. In this context, the idea that the sage is quintessentially wuqing, marked by the absence of desire and emotions, will be examined. I will close with a comparative note on a Confucian account of the same period—namely, the Fuxing shu by Li Ao.

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Intrasexual Competition And Eating Restriction In Heterosexual And Homosexual Individuals, Norman P. Li, April R. Smith, Vladas Griskevicius, Margaret J. Cason, Angela Bryan Jan 2010

Intrasexual Competition And Eating Restriction In Heterosexual And Homosexual Individuals, Norman P. Li, April R. Smith, Vladas Griskevicius, Margaret J. Cason, Angela Bryan

Research Collection School of Social Sciences

Restrictive eating attitudes and behaviors have been hypothesized to be related to processes of intrasexual competition. According to this perspective, within-sex competition for status serves the adaptive purpose of attracting mates. As such, status competition salience may lead to concerns of mating desirability. For heterosexual women and gay men, such concerns revolve around appearing youthful and, thus, thinner. Following this logic, we examined how exposure to high-status and competitive (but not thin or highly attractive) same-sex individuals would influence body image and eating attitudes in heterosexual and in gay/lesbian individuals. Results indicated that for heterosexuals, intrasexual competition cues led to …

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Understanding Analysts Forecasts, R. J. Louth, P. Joos, S. E. Satchell, Guy Weyns Jan 2010

Understanding Analysts Forecasts, R. J. Louth, P. Joos, S. E. Satchell, Guy Weyns

Research Collection School Of Accountancy

The purpose of this paper is to model analysts’ forecasts. The paper differs from the previous research in that we do not focus on how accurate these predictions may be. Accuracy may indeed be an important quality but we argue instead that another equally important aspect of the analysts’ job is to predict and describe the impact of jump events. In effect, the analysts’ role is one of scenario prediction. Using a Bayesian-inspired generalised method of moments estimation procedure, we use this notion of scenario prediction combined with the structure of the Morgan Stanley analysts’ forecasting database to model …

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Wrongful Convictions In Singapore: A General Survey Of Risk Factors, Siyuan Chen, Eunice Chua Jan 2010

Wrongful Convictions In Singapore: A General Survey Of Risk Factors, Siyuan Chen, Eunice Chua

Research Collection Yong Pung How School Of Law

This article seeks to raise awareness about the potential for wrongful convictions in Singapore by analysing the factors commonly identified as contributing towards wrongful convictions in other jurisdictions, including institutional failures and suspect evidence. It also considers whether the social conditions in Singapore are favourable to discovering and publicising wrongful convictions. The authors come to the conclusion that Singapore does well on a number of fronts and no sweeping reforms are necessary However there are areas of risk viz the excessive focus on crime control rather than due process, which require some tweaking of the system.

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Moral Hazard, Firms’ Internal Governance And Management Earnings Forecasts, Jimmy Lee Jan 2010

Moral Hazard, Firms’ Internal Governance And Management Earnings Forecasts, Jimmy Lee

Research Collection School Of Accountancy

This paper investigates the role of management earnings forecasts in mitigating information asymmetry between investors andmanagers relating to moral hazard, and explains how earnings guidance facilitates monitoring. I demonstrate that firms that are more susceptible to moral hazard problems and more difficult to monitor are also more likely to issue annual earningsforecasts and they do so more frequently. In addition, I examine how firm internal governance drives forecasting decisions andshow that stronger board governance and managerial equity incentives are associated with higher likelihood and frequency of forecast issuance. Finally, I provide robust evidence that managerial equity incentives are associated with …

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Trust-Oriented Composite Service Selection With Qos Constraints, Lei Li, Yang Wang, Ee Peng Lim Jan 2010

Trust-Oriented Composite Service Selection With Qos Constraints, Lei Li, Yang Wang, Ee Peng Lim

Research Collection School Of Computing and Information Systems

In Service-Oriented Computing (SOC) environments, service clients interact with service providers for consuming services. From the viewpoint of service clients, the trust level of a service or a service provider is a critical factor to consider in service selection, particularlywhen a client is looking for a service from a large set of services or service providers. However, a invoked service may be composed of other services. The complex invocations in composite services greatly increase the complexity of trust-oriented service selection. In this paper, we propose novel approaches for composite service representation, trust evaluation and trust-oriented com-posite service selection (with QoS …

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Information Integration For Graph Databases, Ee Peng Lim, Aixin Sun, Anwitaman Datta, Chang Kuiyu Jan 2010

Information Integration For Graph Databases, Ee Peng Lim, Aixin Sun, Anwitaman Datta, Chang Kuiyu

Research Collection School Of Computing and Information Systems

With increasing interest in querying and analyzing graph data from multiple sources, algorithms and tools to integrate different graphs become very important. Integration of graphs can take place at the schema and instance levels. While links among graph nodes pose additional challenges to graph information integration, they can also serve as useful features for matching nodes representing real-world entities. This chapter introduces a general framework to perform graph information integration. It then gives an overview of the state-of-the-art research and tools in graph information integration.

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Wikipedia2onto: Building Concept Ontology Automatically, Experimenting With Web Image Retrieval, Huan Wang, Xing Jiang, Liang-Tien Chia, Ah-Hwee Tan Jan 2010

Wikipedia2onto: Building Concept Ontology Automatically, Experimenting With Web Image Retrieval, Huan Wang, Xing Jiang, Liang-Tien Chia, Ah-Hwee Tan

Research Collection School Of Computing and Information Systems

Given its effectiveness to better understand data, ontology has been used in various domains including artificial intelligence, biomedical informatics and library science. What we have tried to promote is the use of ontology to better understand media (in particular, images) on the World Wide Web. This paper describes our preliminary attempt to construct a large-scale multi-modality ontology, called AutoMMOnto, for web image classification. Particularly, to enable the automation of text ontology construction, we take advantage of both structural and content features of Wikipedia and formalize real world objects in terms of concepts and relationships. For visual part, we train classifiers …

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Teleoph: A Secure Real-Time Teleophthalmology System, Yongdong Wu, Zhou Wei, Haixia Yao, Zhigang Zhao, Lek Heng Ngoh, Robert H. Deng, Shengsheng Yu Jan 2010

Teleoph: A Secure Real-Time Teleophthalmology System, Yongdong Wu, Zhou Wei, Haixia Yao, Zhigang Zhao, Lek Heng Ngoh, Robert H. Deng, Shengsheng Yu

Research Collection School Of Computing and Information Systems

Teleophthalmology (TeleOph) is an electronic counterpart of today's face-to-face, patient-to-specialist ophthalmology system. It enables one or more ophthalmologists to remotely examine a patient's condition via a confidential and authentic communication channel. Specifically, TeleOph allows a trained nonspecialist in a primary clinic to screen the patients with digital instruments (e.g., camera, ophthalmoscope). The acquired medical data are delivered to the hospital where an ophthalmologist will review the data collected and, if required, provide further consultation for the patient through a real-time secure channel established over a public Internet network. If necessary, the ophthalmologist is able to further sample the images/video of …

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An Empirical Analysis Of Mobile Voice Service And Sms: A Structural Model, Youngsoo Kim, Rahul Telang, William B. Vogt, Ramayya Krishnan Jan 2010

An Empirical Analysis Of Mobile Voice Service And Sms: A Structural Model, Youngsoo Kim, Rahul Telang, William B. Vogt, Ramayya Krishnan

Research Collection School Of Computing and Information Systems

In addition to the wireless telephony boom, a similar exponentially increasing trend in wireless data service—for example, short message service (SMS)—is visible as technology advances. We develop a structural model to examine user demand for voice service and SMS. Specifically, we measure the own- and cross-price elasticities of these services. The cross-price elasticity is of significant importance because marketing activities are critically influenced by whether the goods are substitutes or complements. The research context poses significant econometric challenges due to three-part tariffs and sequential discrete plan choice and continuous quantity choice decisions. Using detailed individual consumption data of more than …

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Nonparametric Tests For Poolability In Panel Data Models With Cross Section Dependence, Sainan Jin, Liangjun Su Jan 2010

Nonparametric Tests For Poolability In Panel Data Models With Cross Section Dependence, Sainan Jin, Liangjun Su

Research Collection School Of Economics

In this paper we propose a nonparametric test for poolability in large dimensional semiparametric panel data models with cross-section dependence based on the sieve estimation technique. To construct the test statistic, we only need to estimate the model under the alternative. We establish the asymptotic normal distributions of our test statistic under the null hypothesis of poolability and a sequence of local alternatives, and prove the consistency of our test. We also suggest a bootstrap method as an alternative way to obtain the critical values and justify its validity. A small set of Monte Carlo simulations indicate the test performs …

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Estimation Of High-Frequency Volatility: An Autoregressive Conditional Duration Models Approach, Yiu Kuen Tse, Tao Yang Jan 2010

Estimation Of High-Frequency Volatility: An Autoregressive Conditional Duration Models Approach, Yiu Kuen Tse, Tao Yang

Research Collection School Of Economics

We propose a method to estimate the intraday volatility of a stock by integrating the instantaneous conditional return variance per unit time obtained from the autoregressive conditional duration (ACD) models. We compare the daily volatilities estimated using the ACD models against several versions of the realized volatility (RV) method, including the bipower variation realized volatility with subsampling, the realized kernel estimate and the duration-based realized volatility. The ACD volatility estimates correlate highly with and perform very well against the RV estimates. Our Monte Carlo results show that our method has lower root mean-squared error than the RV methods in most …

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Numerical Analysis Of Non-Constant Pure Rate Of Time Preference: A Model Of Climate Policy, Tomoki Fujii, Larry Karp Jan 2010

Numerical Analysis Of Non-Constant Pure Rate Of Time Preference: A Model Of Climate Policy, Tomoki Fujii, Larry Karp

Research Collection School Of Economics

When current decisions affect welfare in the far-distant future, as with climate change, the use of a declining pure rate of time preference (PRTP) provides potentially important modeling flexibility. The difficulty of analyzing models with non-constant PRTP limits their application. We describe and provide software (available online) to implement an algorithm to numerically obtain a Markov perfect equilibrium for an optimal control problem with non-constant PRTP. We apply this software to a simplified version of the numerical climate change model used in the Stern Review. For our calibration, the policy recommendations are less sensitive to the PRTP than widely believed.

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Managing Capital Flows: The Case Of Singapore, Hwee Kwan Chow Jan 2010

Managing Capital Flows: The Case Of Singapore, Hwee Kwan Chow

Research Collection School Of Economics

The resurgence of private capital inflows into Asia in recent years has raised the question of whether the region is susceptible to yet another financial crisis. While a sudden large-scale reversal of capital flows is not likely to result in a liquidity crunch or balance of payments crisis, the attendant sharp corrections in asset prices will have an adverse impact on the economy particularly through indirect channels. We present, in this study, Singapore’s experience in managing the risks posed by capital flows as well as the retention of control over exchange rates and monetary conditions. It is the overall package …

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Functional Coefficient Estimation With Both Categorical And Continuous Data, Liangjun Su, Ye Chen, Aman Ullah Jan 2010

Functional Coefficient Estimation With Both Categorical And Continuous Data, Liangjun Su, Ye Chen, Aman Ullah

Research Collection School Of Economics

We propose a local linear functional coefficient estimator that admits a mix of discrete and continuous data for stationary time series. Under weak conditions our estimator is asymptotically normally distributed. A small set of simulation studies is carried out to illustrate the finite sample performance of our estimator. As an application, we estimate a wage determination function that explicitly allows the return to education to depend on other variables. We find evidence of the complex interacting patterns among the regressors in the wage equation, such as increasing returns to education when experience is very low, high return to education for …

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Testing Linearity In Cointegrating Relations With An Application To Purchasing Power Parity, Seong Hyun Hong, Peter C. B. Phillips Jan 2010

Testing Linearity In Cointegrating Relations With An Application To Purchasing Power Parity, Seong Hyun Hong, Peter C. B. Phillips

Research Collection School Of Economics

This article shows that when applied to nonstationary time series, the conventional Regression Error Specification Test (RESET) leads to severe size distortion and its asymptotic distribution involves a mixture of noncentral chi(2) distributions. Nonstationarity introduces bias terms in the limit distribution, and appropriate corrections for the bias are presented leading to a modified RESET test that has a central chi(2) limit distribution. In simulations, this modified test is shown to have power not only against nonlinear cointegration but also against the absence of cointegration. In an empirical illustration, the linear purchasing power parity (PPP) specification is tested using five Organization …

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Crctol: A Semantic Based Domain Ontology Learning System, Xing Jiang, Ah-Hwee Tan Jan 2010

Crctol: A Semantic Based Domain Ontology Learning System, Xing Jiang, Ah-Hwee Tan

Research Collection School Of Computing and Information Systems

Domain ontologies play an important role in supporting knowledge‐based applications in the Semantic Web. To facilitate the building of ontologies, text mining techniques have been used to perform ontology learning from texts. However, traditional systems employ shallow natural language processing techniques and focus only on concept and taxonomic relation extraction. In this paper we present a system, known as Concept‐Relation‐Concept Tuple‐based Ontology Learning (CRCTOL), for mining ontologies automatically from domain‐specific documents. Specifically, CRCTOL adopts a full text parsing technique and employs a combination of statistical and lexico‐syntactic methods, including a statistical algorithm that extracts key concepts from a document collection, …

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Information Technology Diffusion With Influentials, Imitators, And Opponents: Model And Preliminary Evidence, Hasan Cavusoglu, Nan Hu, Yingjiu Li, Dan Ma Jan 2010

Information Technology Diffusion With Influentials, Imitators, And Opponents: Model And Preliminary Evidence, Hasan Cavusoglu, Nan Hu, Yingjiu Li, Dan Ma

Research Collection School Of Computing and Information Systems

Information technology (IT) innovations follow a diverse set of diffusion patterns. Early diffusion models explaining technology diffusion patterns assumed that there is a single homogeneous segment of potential adopters. It was later shown that a two-segment model considering two groups of adopters explains variations in diffusion patterns better than the existing one-segment models. While the two-segment model considers a group of adopters promoting adoption by exerting a positive influence on prospective adopters, it does not consider the members of society who aim to inhibit the adoption process by exerting a negative influence on prospective adopters. In fact, most IT innovations …

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Dual Phase Learning For Large Scale Video Gait Recognition, Jialie Shen, Hwee Hwa Pang, Dacheng Tao, Xuelong Li Jan 2010

Dual Phase Learning For Large Scale Video Gait Recognition, Jialie Shen, Hwee Hwa Pang, Dacheng Tao, Xuelong Li

Research Collection School Of Computing and Information Systems

Accurate gait recognition from video is a complex process involving heterogenous features, and is still being developed actively. This article introduces a novel framework, called GC2F, for effective and efficient gait recognition and classification. Adopting a ”refinement-and-classification” principle, the framework comprises two components: 1) a classifier to generate advanced probabilistic features from low level gait parameters; and 2) a hidden classifier layer (based on multilayer perceptron neural network) to model the statistical properties of different subject classes. To validate our framework, we have conducted comprehensive experiments with a large test collection, and observed significant improvements in identification accuracy relative to …

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Anonymous Query Processing In Road Networks, Kyriakos Mouratidis, Man Lung Yiu Jan 2010

Anonymous Query Processing In Road Networks, Kyriakos Mouratidis, Man Lung Yiu

Research Collection School Of Computing and Information Systems

The increasing availability of location-aware mobile devices has given rise to a flurry of location-based services (LBSs). Due to the nature of spatial queries, an LBS needs the user position in order to process her requests. On the other hand, revealing exact user locations to a (potentially untrusted) LBS may pinpoint their identities and breach their privacy. To address this issue, spatial anonymity techniques obfuscate user locations, forwarding to the LBS a sufficiently large region instead. Existing methods explicitly target processing in the euclidean space and do not apply when proximity to the users is defined according to network distance …

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A Boosting Framework For Visuality-Preserving Distance Metric Learning And Its Application To Medical Image Retrieval, Yang Liu, Rong Jin, Lily Mummert, Rahul Sukthankar, Adam Goode, Bin Zheng, Steven C. H. Hoi, Mahadev Satyanarayanan Jan 2010

A Boosting Framework For Visuality-Preserving Distance Metric Learning And Its Application To Medical Image Retrieval, Yang Liu, Rong Jin, Lily Mummert, Rahul Sukthankar, Adam Goode, Bin Zheng, Steven C. H. Hoi, Mahadev Satyanarayanan

Research Collection School Of Computing and Information Systems

Similarity measurement is a critical component in content-based image retrieval systems, and learning a good distance metric can significantly improve retrieval performance. However, despite extensive study, there are several major shortcomings with the existing approaches for distance metric learning that can significantly affect their application to medical image retrieval. In particular, "similarity" can mean very different things in image retrieval: resemblance in visual appearance (e.g., two images that look like one another) or similarity in semantic annotation (e.g., two images of tumors that look quite different yet are both malignant). Current approaches for distance metric learning typically address only one …

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Risking Returns: Moving From Public To Private Equity, Aurobindo Ghosh Jan 2010

Risking Returns: Moving From Public To Private Equity, Aurobindo Ghosh

Research Collection School Of Economics

The notion of risk identifies a project that matches with the risk appetite of an entrepreneur not necessarily the investors. This can explain why entrepreneurs would start up companies but it cannot explain why ex-post the investors continue, given that a diversified portfolio of publicly traded assets could potentially generate similar return with lower risk. We re-evaluate the evidence through performance measures using relative probability distributions of public and private equity funds, and identify the nature of the deviations. We observe that the heterogeneity in different investor classes are greatly reduced using standard covariates to identify the choice between public …

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Trust Differences Across National-Societal Cultures: Much To Do, Or Much Ado About Nothing?, Don Ferrin, Nicole Gillespie Jan 2010

Trust Differences Across National-Societal Cultures: Much To Do, Or Much Ado About Nothing?, Don Ferrin, Nicole Gillespie

Research Collection Lee Kong Chian School Of Business

Does trust and its development, functions and meaning, differ between people from different national–societal cultures? There is considerable anecdotal evidence and some theoretical argumentation to suggest it does, but are these supported by empirical research? This chapter reviews the available empirical evidence on the effects of national–societal culture on interpersonal trust. It focuses largely on quantitative empirical evidence to consider the extent to which, and the ways in which, interpersonal trust differs across national–societal cultures. In every category of our review we found evidence of cross-cultural differences, particularly on generalized trust, and also evidence of trust universals across cultures. In …

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