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Value Discount Of Business Groups Surrounding The Asian Financial Crisis: Evidence From Korean Chaebols, James Jinho Chang, Young Jun Cho, Won Kang, Hyun-Han Shin Dec 2007

Value Discount Of Business Groups Surrounding The Asian Financial Crisis: Evidence From Korean Chaebols, James Jinho Chang, Young Jun Cho, Won Kang, Hyun-Han Shin

Research Collection School Of Accountancy

We examine the effect of business group membership on firm value in each pre-and postcrisis Korea. Consistent with prior studies, results show that group affiliated chaebol firms suffer value discount relative to non-chaebol firms in the precrisis period. However, we also find that chaebol firms experience an improvement in firm value relative to non-chaebol firms after the financial crisis. These findings imply that the value discount of business groups reported in prior studies is not an inevitable consequence of diversification, but can be alleviated or overcome by structural reforms in business practices or economic conditions.

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The Association Between Audit Fees And Auditors' Opinions On Internal Control Weakness Under Section 404 Of The Sox, Jong-Hag Choi, Jeong-Bon Kim, Soo Young Kwon, Yoonseok Zang Dec 2007

The Association Between Audit Fees And Auditors' Opinions On Internal Control Weakness Under Section 404 Of The Sox, Jong-Hag Choi, Jeong-Bon Kim, Soo Young Kwon, Yoonseok Zang

Research Collection School Of Accountancy

The Section 404 of Sarbanes-Oxley Act (SOX) requires top management toestablish, maintain, and regularly evaluate the effectiveness of the internal controlover financial reporting (ICOFR), and obtain an auditor’s attestation. In this paper, weidentify 232 firms that received “Ineffective” audit opinion on the effectiveness ofICOFR due to one or more material weakness in internal control (WIC). We examinethe association between audit fees and the WIC for pre- and post-SOX period. Wefind that highly levered clients with the WIC paid greater audit fees even in the preSOXperiod and continuously paid the high fees in post-SOX period, whereas theloss-making clients with WIC paid …

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Multi-Order Neurons For Evolutionary Higher Order Clustering And Growth, Kiruthika Ramanathan, Sheng Uei Guan Dec 2007

Multi-Order Neurons For Evolutionary Higher Order Clustering And Growth, Kiruthika Ramanathan, Sheng Uei Guan

Research Collection School Of Computing and Information Systems

This letter proposes to use multiorder neurons for clustering irregularly shaped data arrangements. Multiorder neurons are an evolutionary extension of the use of higher-order neurons in clustering. Higher-order neurons parametrically model complex neuron shapes by replacing the classic synaptic weight by higher-order tensors. The multiorder neuron goes one step further and eliminates two problems associated with higher-order neurons. First, it uses evolutionary algorithms to select the best neuron order for a given problem. Second, it obtains more information about the underlying data distribution by identifying the correct order for a given cluster of patterns. Empirically we observed that when the …

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Building Social Trust: A Human Capital Approach, Fali Huang Dec 2007

Building Social Trust: A Human Capital Approach, Fali Huang

Research Collection School Of Economics

Much evidence suggests individuals di¤er in their predisposition to cooperate, which is essentially a component of human capital. This paper examines the role of individual cooperative tendencies and their interactions with institutions in generating social trust; it also endogenizes cooperative tendencies using a human capital investment model. Multiple equilibria and ine¢ ciencies exist due to positive externalities. An innovative …nding is that, when institutions are more e¤ective in punishing defecting behaviors, more people invest in cooperative tendencies and hence the endogenous social trust is higher, though the equilibrium cooperative tendencies are lower. This paper provides a plausible explanation for many …

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Geographic Decomposition Of Inequality In Health And Wealth: Evidence From Cambodia, Tomoki Fujii Dec 2007

Geographic Decomposition Of Inequality In Health And Wealth: Evidence From Cambodia, Tomoki Fujii

Research Collection School Of Economics

The small-area estimation developed by Elbers, Lanjouw and Lanjouw (2002, 2003), in which a census and a survey are combined to produce the estimates of welfare measures for small geographic areas, has become a standard tool for poverty analysis in developing countries. The small-area estimates are typically plotted on a map, which are commonly called a poverty map. Poverty maps proved useful for policy analysis and formulation, and have become increasingly popular among policy-makers and researchers. In Cambodia, poverty maps have been used by various international organizations, ministries and non-governmental organizations for analyzing the poverty situations for their operation areas, …

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Global Analysis Of An Expectations Augmented Evolutionary Dynamics, Angelo Antoci, Antonio Gay, Massimiliano Landi, Pier Luigi Sacco Dec 2007

Global Analysis Of An Expectations Augmented Evolutionary Dynamics, Angelo Antoci, Antonio Gay, Massimiliano Landi, Pier Luigi Sacco

Research Collection School Of Economics

We consider a deterministic evolutionary model where players form expectations about future play. Players are not fully rational and have expectations that change over time in response to current payoffs and feedback from the past. We provide a complete characterization of the qualitative dynamics so induced for a two strategies population game, and relate our findings to standard evolutionary dynamics and equilibrium selection when agents have rational forward looking expectations.

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Nonstationary Discrete Choice: A Corrigendum And Addendum, Peter C. B. Phillips, Sainan Jin, Ling Hu Dec 2007

Nonstationary Discrete Choice: A Corrigendum And Addendum, Peter C. B. Phillips, Sainan Jin, Ling Hu

Research Collection School Of Economics

We correct the limit theory presented in an earlier paper by Hu and Phillips [2004a. Nonstationary discrete choice. Journal of Econometrics 120, 103-138] for nonstationary time series discrete choice models with multiple choices and thresholds. The new limit theory shows that, in contrast to the binary choice model with nonstationary regressors and a zero threshold where there are dual rates of convergence (n1/4 and n3/4), all parameters including the thresholds converge at the rate n3/4. The presence of nonzero thresholds therefore materially affects rates of convergence. Dual rates of convergence reappear when stationary variables are present in the system. Some …

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Incidental Trends And The Power Of Panel Unit Root Tests, Hyungsik Roger Moon, Benoit Perrron, Peter C. B. Phillips Dec 2007

Incidental Trends And The Power Of Panel Unit Root Tests, Hyungsik Roger Moon, Benoit Perrron, Peter C. B. Phillips

Research Collection School Of Economics

The asymptotic local power of various panel unit root tests is investigated. The (Gaussian) power envelope is obtained under homogeneous and heterogeneous alternatives. The envelope is compared with the asymptotic power functions for the pooled t-test, the Ploberger and Phillips [2002. Optimal testing for unit roots in panel data. Mimeo] test, and a point optimal test in neighborhoods of unity that are of order n-1/4T-1 and n-1/2T-1, depending on whether or not incidental trends are extracted from the panel data. In the latter case, when the alternative hypothesis is homogeneous across individuals, it is shown that the point optimal test …

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Building Social Trust: A Human Capital Approach, Fali Huang Dec 2007

Building Social Trust: A Human Capital Approach, Fali Huang

Research Collection School Of Economics

Much evidence suggests individuals differ in their predisposition to cooperate, which is essentially a component of human capital. This paper examines the role of individual cooperative tendencies and their interactions with institutions in generating social trust; it also endogenizes cooperative tendencies using a human-capital investment model. Multiple equilibria and inefficiencies exist due to positive externalities. An innovative finding is that, when institutions are more effective in punishing defecting behaviors, more people invest in cooperative tendencies and hence the endogenous social trust is higher, though the equilibrium cooperative tendencies are lower. This paper provides a plausible explanation for many empirical and …

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A Consistent Characteristic Function-Based Test For Conditional Independence, Liangjun Su, Halbert White Dec 2007

A Consistent Characteristic Function-Based Test For Conditional Independence, Liangjun Su, Halbert White

Research Collection School Of Economics

Y is conditionally independent of Z given X if Pr{f(y|X,Z)=f(y|X)}=1 for all y on its support, where f(·|·) denotes the conditional density of Y given (X,Z) or X. This paper proposes a nonparametric test of conditional independence based on the notion that two conditional distributions are equal if and only if the corresponding conditional characteristic functions are equal. We extend the test of Su and White (2005. A Hellinger-metric nonparametric test for conditional independence. Discussion Paper, Department of Economics, UCSD) in two directions: (1) our test is less sensitive to the choice of bandwidth sequences; (2) our test has power …

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Understanding Highly Competent Information System Users, Brenda Eschenbrenner, Fiona Fui-Hoon Nah Dec 2007

Understanding Highly Competent Information System Users, Brenda Eschenbrenner, Fiona Fui-Hoon Nah

Research Collection School Of Computing and Information Systems

Individuals differ in their abilities to use information systems (IS) effectively, with some achieving exceptional performance in IS use. Using the Repertory Grid Technique, this research identifies attributes of highly competent IS users that distinguish them from less competent users. Using the Grounded Theory approach, we identified categories and sub-categories of these attributes and used them to develop a conceptual framework to explain IS User Competency. The findings indicate that highly competent users differ from less competent users in their Personality Traits and Disposition Factors, General Cognitive Abilities, Social Skills and Tendencies, Experiential Learning Factors, Domain Knowledge of and Skills …

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Tuning Tabu Search Strategies Via Visual Diagnosis, Steven Halim, Hoong Chuin Lau Dec 2007

Tuning Tabu Search Strategies Via Visual Diagnosis, Steven Halim, Hoong Chuin Lau

Research Collection School Of Computing and Information Systems

While designing working metaheuristics can be straightforward, tuning them to solve the underlying combinatorial optimization problem well can be tricky. Several tuning methods have been proposed but they do not address the new aspect of our proposed classification of the metaheuristic tuning problem: tuning search strategies. We propose a tuning methodology based on Visual Diagnosis and a generic tool called Visualizer for Metaheuristics Development Framework(V-MDF) to address specifically the problem of tuning search (particularly Tabu Search) strategies. Under V-MDF, we propose the use of a Distance Radar visualizer where the human and computer can collaborate to diagnose the occurrence of …

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The Japanization Of American Corporate Governance? Evidence Of The Never-Ending History For Corporate Law, Dan W. Puchniak Dec 2007

The Japanization Of American Corporate Governance? Evidence Of The Never-Ending History For Corporate Law, Dan W. Puchniak

Research Collection Yong Pung How School Of Law

The debate over corporate governance convergence has been heated for years and has created a cottage industry of experts. It is premised on the false assumption that American corporate governance has reached the end of its evolution by adopting a shareholder primacy and dispersed shareholding governance model. This article demonstrates that American corporate governance continues to evolve and that as such the convergence debate is fundamentally flawed and not worth fixing. The point of this article is simple: there is no endpoint corporate governance model. There is no optimally efficient American model. There is no optimally efficient Japanese model. To …

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Investigating Web-Based Recruitment Sources: Employee Testimonials Vs Word-Of-Mouse, Greet Van Hoye, Filip Lievens Dec 2007

Investigating Web-Based Recruitment Sources: Employee Testimonials Vs Word-Of-Mouse, Greet Van Hoye, Filip Lievens

Research Collection Lee Kong Chian School Of Business

Although the internet has dramatically changed recruitment practices, many web-based recruitment sources have not yet been investigated. The present study examines the effects of web-based employee testimonials and web-based word-of-mouth (i.e., 'word-of-mouse') on organizational attraction. The source credibility framework is used to compare these company-dependent and company-independent recruitment sources. In a sample of potential applicants for a head nurse position, word-of-mouse was associated with higher organizational attractiveness than web-based employee testimonials. However, potential applicants were more attracted when testimonials provided information about individual employees than about the organization. Conversely, word-of-mouse was associated with higher organizational attractiveness and more organizational pursuit …

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The Validity Of Assessment Centres For The Prediction Of Supervisory Performance Ratings: A Meta-Analysis, Eran Hermelin, Filip Lievens, Ivan T. Robertson Dec 2007

The Validity Of Assessment Centres For The Prediction Of Supervisory Performance Ratings: A Meta-Analysis, Eran Hermelin, Filip Lievens, Ivan T. Robertson

Research Collection Lee Kong Chian School Of Business

The current meta-analysis of the selection validity of assessment centres aims to update an earlier meta-analysis of assessment centre validity. To this end, we retrieved 26 studies and 27 validity coefficients (N=5850) relating the Overall Assessment Rating (OAR) to supervisory performance ratings. The current study obtained a corrected correlation of .28 between the OAR and supervisory job performance ratings (95% confidence interval .24 < =rho < =.32). It is further suggested that this validity estimate is likely to be conservative given that assessment centre validities tend to be affected by indirect range restriction.

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Norming "Moderation" In An "Iconic Target": Public Policy And The Regulation Of Religious Anxieties In Singapore, Eugene K. B. Tan Dec 2007

Norming "Moderation" In An "Iconic Target": Public Policy And The Regulation Of Religious Anxieties In Singapore, Eugene K. B. Tan

Research Collection Yong Pung How School Of Law

The maintenance of a “moderate mainstream” Muslim community as a bulwark against the fraying of harmonious ethnic relations has become a key governance concern post-September 11. In light of the global concern—and often paranoia—with diasporic Islam, Islamic religious institutions and civil society have been portrayed in the popular media as hotbeds of radicalism, promoters of hatred, and recruiters for a “conflict of civilization” between the Muslim world and the modern world. Having declared itself a terrorist's “iconic target,” Singapore has taken a broad-based community approach in advancing inter-religious tolerance, including a subtle initiative to include the “Muslim civil society” in …

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Michael Schaper On Small Businesses: Unravelling Popular Myths About Their Value And Viability, Knowledge@Smu Nov 2007

Michael Schaper On Small Businesses: Unravelling Popular Myths About Their Value And Viability, Knowledge@Smu

Knowledge@SMU

Small businesses typically account for more than 95% of all private sector entities and employ more than half the workforce in some countries, reveals a study by Michael Schaper, dean of the Murdoch University Business School in Australia. Speaking at the Singapore Management University’s UOB-SMU Enterprise Alliance Centre recently, Schaper dismantled some common misconceptions about the value and profiles of small businesses and their owners.

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Do Software Development Projects Dispersed Across The Globe Deliver The Goods?, Knowledge@Smu Nov 2007

Do Software Development Projects Dispersed Across The Globe Deliver The Goods?, Knowledge@Smu

Knowledge@SMU

Higher demands on computer systems and networks compel technology companies to assign software development duties across many dispersed centres in the US, India, China and elsewhere. In actual practice, does this distributed development model work well? Singapore Management University information systems professors Narayan Ramasubbu and Rajesh Krishna Balan examined this question in an award-winning paper, “Globally Distributed Software Development Project Performance: An Empirical Analysis,” presented recently at a joint meeting of the European Software Engineering Conference and the ACM SIGSOFT symposium.

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Procedural Fairness, Outcome Favorability, And Judgments Of An Authority's Responsibility, Joel Brockner, Ariel Y. Fishman, Jochen Reb, Barry M. Goldman, Scott Spiegel, Charlee Garden Nov 2007

Procedural Fairness, Outcome Favorability, And Judgments Of An Authority's Responsibility, Joel Brockner, Ariel Y. Fishman, Jochen Reb, Barry M. Goldman, Scott Spiegel, Charlee Garden

Research Collection Lee Kong Chian School Of Business

Fairness theory (R. Folger & R. Cropanzano, 1998, 2001) postulates that, particularly in the face of unfavorable outcomes, employees judge an organizational authority to be more responsible for their outcomes when the authority exhibits lower procedural fairness. Three studies lent empirical support to this notion. Furthermore, 2 of the studies showed that attributions of responsibility to the authority mediated the relationship between the authority's procedural fairness and employees' reactions to unfavorable outcomes. The findings (a) provide support for a key assumption of fairness theory, (b) help to account for the pervasive interactive effect of procedural fairness and outcome favorability on …

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An Examination Of Psychometric Bias Due To Retesting On Cognitive Ability Tests In Selection Settings, Filip Lievens, Charlie L. Reeve, Eric D. Heggestad Nov 2007

An Examination Of Psychometric Bias Due To Retesting On Cognitive Ability Tests In Selection Settings, Filip Lievens, Charlie L. Reeve, Eric D. Heggestad

Research Collection Lee Kong Chian School Of Business

Using a latent variable approach, the authors examined whether retesting on a cognitive ability measure resulted in measurement and predictive bias. A sample of 941 candidates completed a cognitive ability 14 test in a high-stakes context. Results of both the within-group between-occasions comparison and the between-groups within-occasion comparison indicated that no measurement bias existed during the initial testing but that retesting induced both measurement and predictive bias. Specifically, the results suggest that the factor underlying the retest scores was less saturated with g and more associated with memory than the latent factor underlying initial test scores and that these changes …

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Technological Knowledge, Product Relatedness, And Parent Control: The Effect On Ijv Survival, Dean Xu, Jane W. Lu Nov 2007

Technological Knowledge, Product Relatedness, And Parent Control: The Effect On Ijv Survival, Dean Xu, Jane W. Lu

Research Collection Lee Kong Chian School Of Business

This article examines the relationships among parent firm technological knowledge, parent-IJV product relatedness, parent control over the IJV, and IJV survival. Combining the knowledge-based perspective and institutional theory, we argue that parent control itself does not necessarily lead to higher IN survival; it contributes to IN survival when the parent firm has a high level of technological knowledge, and when the IJV is product-related to this parent. Results obtained from 1038 Japanese IJVs based in China indicate that both equity control and managerial control of a Japanese parent had a positive interaction effect, with the parent's technological knowledge, on IN …

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On Improving Wikipedia Search Using Article Quality, Meiqun Hu, Ee Peng Lim, Aixin Sun, Hady Wirawan Lauw, Ba-Quy Vuong Nov 2007

On Improving Wikipedia Search Using Article Quality, Meiqun Hu, Ee Peng Lim, Aixin Sun, Hady Wirawan Lauw, Ba-Quy Vuong

Research Collection School Of Computing and Information Systems

Wikipedia is presently the largest free-and-open online encyclopedia collaboratively edited and maintained by volunteers. While Wikipedia offers full-text search to its users, the accuracy of its relevance-based search can be compromised by poor quality articles edited by non-experts and inexperienced contributors. In this paper, we propose a framework that re-ranks Wikipedia search results considering article quality. We develop two quality measurement models, namely Basic and PeerReview, to derive article quality based on co-authoring data gathered from articles' edit history. Compared with Wikipedia's full-text search engine, Google and Wikiseek, our experimental results showed that (i) quality-only ranking produced by PeerReview gives …

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Machine-Assisted Proof Support For Validation Beyond Simulink, Chunqing Chen, Jin Song Dong, Jun Sun Nov 2007

Machine-Assisted Proof Support For Validation Beyond Simulink, Chunqing Chen, Jin Song Dong, Jun Sun

Research Collection School Of Computing and Information Systems

Simulink is popular in industry for modeling and simulating embedded systems. It is deficient to handle requirements of high-level assurance and timing analysis. Previously, we showed the idea of applying Timed Interval Calculus (TIC) to complement Simulink. In this paper, we develop machine-assisted proof support for Simulink models represented in TIC. The work is based on a generic theorem prover, Prototype Verification System (PVS). The TIC specifications of both Simulink models and requirements are transformed to PVS specifications automatically. Verification can be carried out at interval level with a high level of automation. Analysis of continuous and discrete behaviors is …

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Modeling Semantics In Composite Web Service Requests By Utility Elicitation, Qianhui Althea Liang, Jen Yao Chung, Steven M. Miller Nov 2007

Modeling Semantics In Composite Web Service Requests By Utility Elicitation, Qianhui Althea Liang, Jen Yao Chung, Steven M. Miller

Research Collection School Of Computing and Information Systems

When meeting the challenges in automatic and semi-automatic Web service composition, capturing the user’s service demand and preferences is as important as knowing what the services can do. This paper discusses the idea of semantic service requests for composite services, and presents a multi-attribute utility theory (MAUT) based model of composite service requests. Service requests are modeled as user preferences and constraints. Two preference structures, additive independence and generalized additive independence, are utilized in calculating the expected utilities of service composition outcomes. The model is also based on an iterative and incremental scheme meant to better capture requirements in accordance …

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Context-Aware Statistical Debugging: From Bug Predictors To Faulty Control Flow Paths, Lingxiao Jiang, Zhendong Su Nov 2007

Context-Aware Statistical Debugging: From Bug Predictors To Faulty Control Flow Paths, Lingxiao Jiang, Zhendong Su

Research Collection School Of Computing and Information Systems

Effective bug localization is important for realizing automated debugging. One attractive approach is to apply statistical techniques on a collection of evaluation profiles of program properties to help localize bugs. Previous research has proposed various specialized techniques to isolate certain program predicates as bug predictors. However, because many bugs may not be directly associated with these predicates, these techniques are often ineffective in localizing bugs. Relevant control flow paths that may contain bug locations are more informative than stand-alone predicates for discovering and understanding bugs. In this paper, we propose an approach to automatically generate such faulty control flow paths …

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Mining Modal Scenarios-Based Specifications From Execution Trace Of Reactive Systems, David Lo, Shahar Maoz, Siau-Cheng Khoo Nov 2007

Mining Modal Scenarios-Based Specifications From Execution Trace Of Reactive Systems, David Lo, Shahar Maoz, Siau-Cheng Khoo

Research Collection School Of Computing and Information Systems

Specification mining is a dynamic analysis process aimed at automatically inferring suggested specifications of a program from its execution traces. We describe a novel method, framework, and tool, for mining inter-object scenario-based specifications in the form of a UML2-compliant variant of Damm and Harels Live Sequence Charts (LSC). LSC extends the classical partial order semantics of sequence diagrams with temporal liveness and symbolic class level lifelines, in order to generate compact and expressive specifications. The output of our algorithm is a sound and complete set of statistically significant LSCs (i.e., satisfying given thresholds of support and confidence), mined from an …

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Legal Systems And Earnings Quality: The Role Of Auditor Industry Specialization, Chee Yeow Lim, Soo Young Kwon, Patricia Mui Siang Tan Nov 2007

Legal Systems And Earnings Quality: The Role Of Auditor Industry Specialization, Chee Yeow Lim, Soo Young Kwon, Patricia Mui Siang Tan

Research Collection School Of Accountancy

This paper extends prior studies in auditor industry specialization to an international setting and examines if the impact of industry specialist auditors on earnings quality is dependent on the legal environments. Using data for 28 countries over 20 industries from 1993 to 2003, we find that clients of industry specialist auditors have lower discretionary current accruals and higher earnings response coefficients than clients of nonspecialist auditors. In addition, we find that the impact of auditor industry specialization on earnings quality increases as the legal environment weakens. Collectively, the results suggest that the benefits from engaging the services of industry specialist …

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Model Checking In The Absence Of Code, Model And Properties, David Lo, Siau-Cheng Khoo Nov 2007

Model Checking In The Absence Of Code, Model And Properties, David Lo, Siau-Cheng Khoo

Research Collection School Of Computing and Information Systems

Model checking is a major approach in ensuring software correctness. It verifies a model converted from code against some formal properties. However, difficulties and programmers ’ reluctance to formalize formal properties have been some hurdles to its widespread industrial adoption. Also, with the advent of commercial off-the-shelf (COTS) components provided by third party vendors, model checking is further challenged as often only a binary version of the code is provided by vendors. Interestingly, latest instrumentation tools like PIN and Valgrind have enable execution traces to be collected dynamically from a running program. In this preliminary study, we investigate what can …

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Light-Weight Encryption Schemes For Multimedia Data, Feng Bao, Robert H. Deng Nov 2007

Light-Weight Encryption Schemes For Multimedia Data, Feng Bao, Robert H. Deng

Research Collection School Of Computing and Information Systems

Due to the pervasiveness of high-speed networks and multimedia communications and storage, the demand for highspeed cryptosystems is ever increasing. It is widely believed that there is a tradeoff between speed and security in cryptosystem design. No existing encryption algorithms are both fast enough for high-speed operation and sufficiently secure to withstand powerful cryptanalysis. In this paper, we propose and analyze a generic construction of high-speed encryption schemes. Our solution is based on the fact that there exist secure but relatively slow block ciphers, e. g. AES, and super-fast but relatively weaker stream ciphers. We then combine a secure block …

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The Eu's "Sanctions Paradox", Portela, Clara Oct 2007

The Eu's "Sanctions Paradox", Portela, Clara

Research Collection School of Social Sciences

The forthcoming Summit meeting between the European Union (EU) and Africa next December will be the first event of this kind in the past seven years. However, the row over the participation of Zimbabwe’s President, Robert Mugabe, is casting a shadow over the upcoming event: A number of African states have threatened to boycott the meeting if Zimbabwe's leader is not invited, while the British government has indicated that it will not attend the meeting if he does. At the root of this row is an “EU sanction”: a visa ban prohibiting the entry into EU territory to Zimbabwean high-rank …

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