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Articles 8911 - 8940 of 10054
Full-Text Articles in Entire DC Network
A Unified Confidence Interval For Reliability-Related Quantities Of Two-Parameter Weibull Distribution, Zhenlin Yang, Min Xie, Augustine C.M. Wong
A Unified Confidence Interval For Reliability-Related Quantities Of Two-Parameter Weibull Distribution, Zhenlin Yang, Min Xie, Augustine C.M. Wong
Research Collection School Of Economics
Statistical inference methods for the Weibull parameters and their functions usually depend on extensive tables, and hence are rather inconvenient for the practical applications. In this paper, we propose a general method for constructing confidence intervals for the Weibull parameters and their functions, which eliminates the need for the extensive tables. The method is applied to obtain confidence intervals for the scale parameter, the mean-time-to-failure, the percentile function, and the reliability function. Monte-Carlo simulation shows that these intervals possess excellent finite sample properties, having coverage probabilities very close to their nominal levels, irrespective of the sample size and the degree …
Cognitive Evaluation Of Information Modeling Methods, Keng Siau, Yuan Wang
Cognitive Evaluation Of Information Modeling Methods, Keng Siau, Yuan Wang
Research Collection School Of Computing and Information Systems
In the field of information system engineering, information modeling method is a technique to capture user requirements and to understand system complexity. The importance of information modeling has been recognized by practitioners and researchers, but little has been explored to analyze the available information modeling methods or to evaluate them in terms of their strengths, weaknesses, and effectiveness. This research analyzes six information-modeling methods: use case diagram, rich picture diagram, entity-relationship diagram, Trochim’s concept mapping, repertory grid, and causal mapping. These information-modeling methods are analyzed from a cognitive perspective in order to better understand their nature, the assumptions, and the …
Deckard: Scalable And Accurate Tree-Based Detection Of Code Clones, Lingxiao Jiang, Ghassan Misherghi, Zhendong Su, Stephane Glondu
Deckard: Scalable And Accurate Tree-Based Detection Of Code Clones, Lingxiao Jiang, Ghassan Misherghi, Zhendong Su, Stephane Glondu
Research Collection School Of Computing and Information Systems
Detecting code clones has many software engineering applications. Existing approaches either do not scale to large code bases or are not robust against minor code modifications. In this paper, we present an efficient algorithm for identifying similar subtrees and apply it to tree representations of source code. Our algorithm is based on a novel characterization of subtrees with numerical vectors in the Euclidean Rn and an efficient algorithm to cluster these vectors w.r.t. the Euclidean distance metric. Subtrees with vectors in one cluster are considered similar. We have implemented our tree similarity algorithm as a clone detection tool called DECKARD …
Forgery Attack To An Asymptotically Optimal Traitor Tracing Scheme, Yongdong Wu, Feng Bao, Robert H. Deng
Forgery Attack To An Asymptotically Optimal Traitor Tracing Scheme, Yongdong Wu, Feng Bao, Robert H. Deng
Research Collection School Of Computing and Information Systems
In this paper, we present a forgery attack to a black-box traitor tracing scheme [2] called as CPP scheme. CPP scheme has efficient transmission rate and allows the tracer to identify a traitor with just one invalid ciphertext. Since the original CPP scheme is vulnerable to the multi-key attack, we improved CPP to thwart the attack. However, CPP is vulnerable to a fatal forgery attack. In the forgery attack, two traitors can collude to forge all valid decryption keys. The forged keys appear as perfect genuine keys, can decrypt all protected content, but are untraceable by the tracer. Fortunately, we …
Can Training Improve The Quality Of Inferences Made By Raters In Competency Modeling? A Quasi-Experiment, Filip Lievens, Juan I. Sanchez
Can Training Improve The Quality Of Inferences Made By Raters In Competency Modeling? A Quasi-Experiment, Filip Lievens, Juan I. Sanchez
Research Collection Lee Kong Chian School Of Business
A quasi-experiment was conducted to investigate the effects of frame-of-reference training on the quality of competency modeling ratings made by consultants. Human resources consultants from a large consulting firm were randomly assigned to either a training or a control condition. The discriminant validity, interrater reliability, and accuracy of the competency ratings were significantly higher in the training group than in the control group. Further, the discriminant validity and interrater reliability of competency inferences were highest among an additional group of trained consultants who also had competency modeling experience. Together, these results suggest that procedural interventions such as rater training can …
Vertically-Coupled Microring Laser Array For Dual-Wavelength Generation, Chyng Wen Tee, K. A. Williams, R. V. Penty, I. H. White, M. Hamacher, U. Troppenz, H. Heidrich
Vertically-Coupled Microring Laser Array For Dual-Wavelength Generation, Chyng Wen Tee, K. A. Williams, R. V. Penty, I. H. White, M. Hamacher, U. Troppenz, H. Heidrich
Research Collection Lee Kong Chian School Of Business
We report the first demonstration of continuous-wave operation of a tunable, compact microring laser array based on a vertical-coupling architecture, well suited to larger-scale integration. Wavelength separation tunability from 4.9 to 6.3nm is observed.
China's Large Aircraft Program Gains Momentum: When Will It Take Off?, Knowledge@Smu
China's Large Aircraft Program Gains Momentum: When Will It Take Off?, Knowledge@Smu
Knowledge@SMU
With its decision earlier this year to relaunch its large aircraft program, China has signaled its intent to challenge Boeing and Airbus SA’s dominant positions in the global market. On February 26, the Chinese government announced its approval of the program and a future company to operate it. The news is a strong signal that, despite unsuccessful efforts in the 1980s, China sees the benefits of developing large aircraft, including the impact this will have on other industries, such as machinery, electronics, metallurgy, chemicals, energy and IT. What are the driving forces for this program and what will the new …
China Forges Ahead On Financial Reform – At Its Own Pace, With Its Own Rules, Knowledge@Smu
China Forges Ahead On Financial Reform – At Its Own Pace, With Its Own Rules, Knowledge@Smu
Knowledge@SMU
China’s fast-evolving financial industry, like the country itself, defies the type of easy, sound bite-friendly synopses that foreign investors might like. It’s often unclear exactly what factors are stoking China’s remarkable economic growth engine. Or, as Winston Wenyan Ma, an investment banker who most recently worked for J.P. Morgan in New York and is the author of Investing in China – New Opportunities in a Transforming Stock Market, puts it: “The Chinese financial industry is a very complex story.” Speaking at the recent Wharton China Business Forum in Philadelphia, Ma moderated a panel on financial reform – a key ingredient …
The Effect Of Financial Hedging On The Incentives For Corporate Diversification: The Role Of Stakeholder Firm-Specific Investments, Sonya Seongyeon Lim, Heli Wang
The Effect Of Financial Hedging On The Incentives For Corporate Diversification: The Role Of Stakeholder Firm-Specific Investments, Sonya Seongyeon Lim, Heli Wang
Research Collection Lee Kong Chian School Of Business
Financial hedging and corporate diversification are often considered substitutive means of risk management, implying that rapid development of financial hedging markets will yield less need for firms to manage risk through costly diversification. Building on a stakeholder-based view of risk management, we show that financial hedging and corporate diversification are more often complementary than substitutive. Financial hedging reduces a firm’s systematic risk, encouraging firm-specific investment by stakeholders. Larger firmspecific investment loads excessive idiosyncratic risk on the stakeholders, increasing the benefits of reducing idiosyncratic risk through diversification. Therefore, financial hedging can increase a firm’s incentives to manage risk through diversification.
Mining Colossal Frequent Patterns By Core Pattern Fusion, Feida Zhu, Xifeng Yan, Jiawei Han, Philip S. Yu, Hong Cheng
Mining Colossal Frequent Patterns By Core Pattern Fusion, Feida Zhu, Xifeng Yan, Jiawei Han, Philip S. Yu, Hong Cheng
Research Collection School Of Computing and Information Systems
Extensive research for frequent-pattern mining in the past decade has brought forth a number of pattern mining algorithms that are both effective and efficient. However, the existing frequent-pattern mining algorithms encounter challenges at mining rather large patterns, called colossal frequent patterns, in the presence of an explosive number of frequent patterns. Colossal patterns are critical to many applications, especially in domains like bioinformatics. In this study, we investigate a novel mining approach called Pattern-Fusion to efficiently find a good approximation to the colossal patterns. With Pattern-Fusion, a colossal pattern is discovered by fusing its small core patterns in one step, …
Social Network Structures In Open Source Software Development Teams, Y. Long, Keng Siau
Social Network Structures In Open Source Software Development Teams, Y. Long, Keng Siau
Research Collection School Of Computing and Information Systems
Drawing on social network theories and previous studies, this research examines the dynamics of social network structures in open source software (OSS) teams. Three projects were selected from SourceForge.net in terms of their similarities as well as their differences. Monthly data were extracted from the bug tracking systems in order to achieve a longitudinal view of the interaction pattern of each project. Social network analysis was used to generate the indices of social structure. The finding suggests that the interaction pattern of OSS projects evolves from a single hub at the beginning to a corel periphery model as the projects …
A Multimodal And Multilevel Ranking Framework For Content-Based Video Retrieval, Steven C. H. Hoi, Michael R. Lyu
A Multimodal And Multilevel Ranking Framework For Content-Based Video Retrieval, Steven C. H. Hoi, Michael R. Lyu
Research Collection School Of Computing and Information Systems
One critical task in content-based video retrieval is to rank search results with combinations of multimodal resources effectively. This paper proposes a novel multimodal and multilevel ranking framework for content-based video retrieval. The main idea of our approach is to represent videos by graphs and learn harmonic ranking functions through fusing multimodal resources over these graphs smoothly. We further tackle the efficiency issue by a multilevel learning scheme, which makes the semi-supervised ranking method practical for large-scale applications. Our empirical evaluations on TRECVID 2005 dataset show that the proposed multimodal and multilevel ranking framework is effective and promising for content-based …
A Multimodal And Multilevel Ranking Framework For Content-Based Video Retrieval, Steven C. H. Hoi, Michael R. Lyu
A Multimodal And Multilevel Ranking Framework For Content-Based Video Retrieval, Steven C. H. Hoi, Michael R. Lyu
Research Collection School Of Computing and Information Systems
One critical task in content-based video retrieval is to rank search results with combinations of multimodal resources effectively. This paper proposes a novel multimodal and multilevel ranking framework for content-based video retrieval. The main idea of our approach is to represent videos by graphs and learn harmonic ranking functions through fusing multimodal resources over these graphs smoothly. We further tackle the efficiency issue by a multilevel learning scheme, which makes the semi-supervised ranking method practical for large-scale applications. Our empirical evaluations on TRECVID 2005 dataset show that the proposed multimodal and multilevel ranking framework is effective and promising for content-based …
Socialization And The Business School, Stefano Harney
Socialization And The Business School, Stefano Harney
Research Collection Lee Kong Chian School Of Business
There is a new phase in the generalization of management capacities, but contrary to the assumptions of critical management educators, the investment in the business school has not been to socialize more students into this generalized management, but to seek the principle of generalization in these students themselves as part of a struggle between capital and labour. Using the insights of autonomist feminist theorists, this article attempts to analyse why critical management education has been unable to find a new object appropriate to this new generalization of management, and speculates on what the critical and political benefits might be of …
State-Led Transborder Industrialization In Asia: A Note On Singapore's Manufacturing Enclaves In Vietnam And China, Caroline Yeoh, Wilfred Pow Ngee How
State-Led Transborder Industrialization In Asia: A Note On Singapore's Manufacturing Enclaves In Vietnam And China, Caroline Yeoh, Wilfred Pow Ngee How
Research Collection Lee Kong Chian School Of Business
Singapore-based firms to expand into the region, remain controversial. This strategic initiative is promulgated on the exportability of Singapore’s state credibility, systemic and operational efficiencies as well as technological competencies, to locations where these attributes are less distinct. We present evidence culled from surveys and interviews conducted in the Singapore-styled industrial townships in Vietnam and China. Our results suggest that, while the parks have arguably been a measured success, the advantages supposedly created by the abovementioned export of Singapore’s competencies have proven either illusionary or far less significant than originally envisioned, vis-à-vis more practical economic and competitive concerns.
Compact Vertically-Coupled Microring Laser Array Dual-Wavelength Source For Terahertz Mode Beating, Chyng Wen Tee, K. A. Williams, R. V. Penty, I. H. White
Compact Vertically-Coupled Microring Laser Array Dual-Wavelength Source For Terahertz Mode Beating, Chyng Wen Tee, K. A. Williams, R. V. Penty, I. H. White
Research Collection Lee Kong Chian School Of Business
Continuous-wave operation of a fully tunable compact microring twin-laser array is demonstrated for the first time. The two active microrings, with radii of 70μm and 74μm, are vertically- coupled to a single passive waveguide. Tuning of the current facilitates a wavelength separation from 4.9nm to 6.3nm.
Land Of Opportunity: In The U.S., Immigrants And Entrepreneurs Are Increasingly The Same, Knowledge@Smu
Land Of Opportunity: In The U.S., Immigrants And Entrepreneurs Are Increasingly The Same, Knowledge@Smu
Knowledge@SMU
Consider these numbers: One in four technology and engineering companies founded in the U.S. between 1995 and 2005 had at least one founder who was foreign-born, many of them from India and China; nationwide, immigrant-founded companies generated $52 billion in sales in 2005 and employed 450,000 people; immigrant non-citizens in the U.S. were either named as the inventor or co-inventor in 24.2% of patent applications filed in 2006. These are some of the findings of a recent study titled, "America's New Immigrant Entrepreneurs," by Vivek Wadhwa, an executive in residence at Duke University's Pratt School of Engineering, and a team …
I-Flex Solutions' Rajesh Hukku: 'No One Dreamed That $400,000 Would Become Almost $600 Million In 13 Years', Knowledge@Smu
I-Flex Solutions' Rajesh Hukku: 'No One Dreamed That $400,000 Would Become Almost $600 Million In 13 Years', Knowledge@Smu
Knowledge@SMU
In 1992, Rajesh Hukku, then head of Citicorp Overseas Software, spun off Citicorp Information Technology Industries Ltd. (CITIL), now called i-flex solutions, from the giant financial institution. Citi had decided that software wasn't its business, but invested $400,000 in the venture. In 2005, Oracle bought out Citicorp's 42% interest for $592 million, a humongous return on Citi's investment in just 13 years. In the first of a two-part interview with India Knowledge@Wharton, Hukku spoke about i-flex's start and strategy with Ravi Aron, a senior fellow at Wharton's Mack Center for Technological Innovation.
Online Campaigns: The New Way Marketers Can Reach Out To Chinese Consumers, Knowledge@Smu
Online Campaigns: The New Way Marketers Can Reach Out To Chinese Consumers, Knowledge@Smu
Knowledge@SMU
As the number of netizens in China continues to increase at a torrid pace -- reaching more than 140 million users by early 2007 -- companies keep searching for ways to incorporate the Internet into their marketing campaigns. Through interactive digital marketing, companies hope they can tap into the growing trend of online participation by Chinese consumers and thus influence public perception of their brands. China Knowledge@Wharton interviewed experts in the field and looked at consumer brands, like Pepsi and Samsung, that are at the forefront of efforts to engage consumers in the creative process.
Will Google And Baidu's Arrival Reshape The Mobile Search Industry In China?, Knowledge@Smu
Will Google And Baidu's Arrival Reshape The Mobile Search Industry In China?, Knowledge@Smu
Knowledge@SMU
China Mobile, China’s largest cell phone carrier, and Google, the world’s largest search engine, announced in January a “mobile search” partnership in China. Nine days later, China Unicom, China’s second-largest cell-phone carrier, reportedly entered into talks with Baidu, the Chinese search engine, about developing a similar alliance in China. The news marked the spread of search-engine warfare from computers to cell phones. For both Baidu and Google, a partnership with mobile operators is expected to help them win a significant number of subscribers in a short period of time. Will Google and Baidu’s arrival reshape the mobile search industry in …
Experiences With Tracking The Effects Of Changing Requirements On Morphbank: A Web-Based Bioinformatics Application, Subhajit Datta, Robert Van Engelen, David Gaitros, Neelima Jammigumpula
Experiences With Tracking The Effects Of Changing Requirements On Morphbank: A Web-Based Bioinformatics Application, Subhajit Datta, Robert Van Engelen, David Gaitros, Neelima Jammigumpula
Research Collection School Of Computing and Information Systems
In this paper, we present a case study of applying the metrics Mutation Index, Component Set, Dependency Index on Morphbank- a web based bioinformatics application - to track the effects of changing requirements on a software system and suggest design modifications to mitigate such impact. Morphbank is "an open web repository of biological images documenting specimen-based research in comparative anatomy, morphological phylogenetics, taxonomy and related fields focused on increasing our knowledge about biodiversity". This paper discusses the context of the case study, analyzes the results, highlights observations and learning, and mentions directions of future work.
Efficient Algorithms For Machine Scheduling Problems With Earliness And Tardiness Penalties, Guang Feng, Hoong Chuin Lau
Efficient Algorithms For Machine Scheduling Problems With Earliness And Tardiness Penalties, Guang Feng, Hoong Chuin Lau
Research Collection School Of Computing and Information Systems
In this paper, we study the multi-machine scheduling problem with earliness and tardiness penalties and sequence dependent setup times. This problem can be decomposed into two subproblems—sequencing and timetabling. Sequencing focuses on assigning each job to a fixed machine and determine the job sequence on each machine. We call such assignment a semi-schedule. Timetabling focuses on finding an executable schedule from the semi-schedule via idle-time insertion. Sequencing is strongly NP-hard in general. Although timetabling is polynomial-time solvable, it can become a computational bottleneck if the procedure is executed many times within a larger framework. This paper makes two contributions. We …
Percentage-Based Hybrid Pattern Training With Neural Network Specific Cross Over, Sheng-Uei Guan, Kiruthika Ramanathan
Percentage-Based Hybrid Pattern Training With Neural Network Specific Cross Over, Sheng-Uei Guan, Kiruthika Ramanathan
Research Collection School Of Computing and Information Systems
In this paper, a new weight-setting method is proposed to improve the training time and generalization accuracy of feed-forward neural networks. This method introduces a percentage-based hybrid pattern training (PHP) scheme and aims to provide a solution to the problem dependency of other Genetic Algorithm (GA)-based Neural Network weight-setting methods. A neural network is trained using a neural network specific GA until a certain percentage of the training patterns is learned. The weights thus obtained are used as the initial weights for backpropagation (BP) training, which is then applied to complete the network training. Further improvement to the method was …
Cyber-Trespass And 'Unauthorized Access' As Legal Mechanisms Of Access Control: Lessons From The Us Experience, Mary W. S. Wong
Cyber-Trespass And 'Unauthorized Access' As Legal Mechanisms Of Access Control: Lessons From The Us Experience, Mary W. S. Wong
Research Collection Yong Pung How School Of Law
The common law doctrine of trespass to chattels has recently been revived and applied by courts in the United States (US) to cover intrusions (in the form of electronic signals) to computer systems connected to the Internet. These cases represent judicial recognition of the need to protect certain unwanted intrusions in cyberspace, though the principles developed therewith are remarkably expansive. As such, they overlap with the concept of ‘unauthorized access’ under computer misuse legislation in the US and elsewhere. This overlap has yet to be judicially acknowledged. Since the US, the United Kingdom and other common law countries not only …
Privacy-Preserving Credentials Upon Trusted Computing Augmented Servers, Yanjiang Yang, Robert H. Deng, Feng Bao
Privacy-Preserving Credentials Upon Trusted Computing Augmented Servers, Yanjiang Yang, Robert H. Deng, Feng Bao
Research Collection School Of Computing and Information Systems
Credentials are an indispensable means for service access control in electronic commerce. However, regular credentials such as X.509 certificates and SPKI/SDSI certificates do not address user privacy at all, while anonymous credentials that protect user privacy are complex and have compatibility problems with existing PKIs. In this paper we propose privacy-preserving credentials, a concept between regular credentials and anonymous credentials. The privacy-preserving credentials enjoy the advantageous features of both regular credentials and anonymous credentials, and strike a balance between user anonymity and system complexity. We achieve this by employing computer servers equipped with TPMs (Trusted Platform Modules). We present a …
Tube (Text-Cube) For Discovering Documentary Evidence Of Associations Among Entities, Hady Lauw, Ee Peng Lim, Hwee Hwa Pang
Tube (Text-Cube) For Discovering Documentary Evidence Of Associations Among Entities, Hady Lauw, Ee Peng Lim, Hwee Hwa Pang
Research Collection School Of Computing and Information Systems
User-driven discovery of associations among entities, and documents that provide evidence for these associations, is an important search task conducted by researchers and do-main information specialists. Entities here refer to real or abstract objects such as people, organizations, ideologies, etc. Associations are the inter-relationships among entities. Most current works in query-driven document retrieval and finding representative subgraphs are ill-suited for the task as they lack an awareness of entity types as well as an intuitive representation of associations. We propose the TUBE model, a text cube approach for discovering associations and documentary evidence of these associations. The model consists of …
Organizational Identity And Employer Image: Towards A Unifying Framework, Filip Lievens, Greet Van Hoye, Frederik Anseel
Organizational Identity And Employer Image: Towards A Unifying Framework, Filip Lievens, Greet Van Hoye, Frederik Anseel
Research Collection Lee Kong Chian School Of Business
This study aims to bridge two research streams that have evolved relatively apart from each other, namely the research streams on organizational identity and on employer branding (employer image). In particular, we posit that it is crucial to examine which factors company outsiders (applicants) as well as company insiders (employees) associate with a given employer. To this end, this study uses the instrumental-symbolic framework to study factors relating to both employer image and organizational identity of the Belgian Army. Two samples are used: a sample of 258 Army applicants and a sample of 179 military employees. Results show that both …
Book Review Of "The World’S Newest Profession: Management Consulting In The Twentieth Century", Timothy Adrian Robert Clark
Book Review Of "The World’S Newest Profession: Management Consulting In The Twentieth Century", Timothy Adrian Robert Clark
Research Collection Lee Kong Chian School Of Business
Management consultants are a significant social and economic force. Few people, whether as citizens or members oforganizations, will have escaped the impact of their interventions. A survey revealed that 97 percent of the top 200 companies in the U.K. and U.S. have used management consultants. The spectacular growth of the industry in the last fiftyyears is evidenced by the fact that somewhere in the regionof 80 percent of firms currently operating were establishedafter 1980. The ratio of consultants to managers, as this bookdemonstrates, has grown from one to a hundred in 1965 toone to thirteen in 1995. In this clearly …
Realized Daily Variance Of S&P500 Cash Index: A Revaluation Of Stylized Facts, Shirley J. Huang, Qianqiu Liu, Jun Yu
Realized Daily Variance Of S&P500 Cash Index: A Revaluation Of Stylized Facts, Shirley J. Huang, Qianqiu Liu, Jun Yu
Research Collection Lee Kong Chian School Of Business
In this paper, the realized daily variance is obtained from intraday transaction prices of the S&P 500 cash index over the period from January 1993 to December 2004. When constructing realized daily variance, market microstructure noise is taken into account using a technique proposed by Zhang, Mykland, and Ait-Sahalia (2005). The time series properties of realized daily variance are compared with those of variance estimates obtained from parametric GARCH and stochastic volatility models. Unconditional and dynamic properties concerning the realized daily variance are examined, the relationship between realized variance and returns is investigated, and the stylized facts concerning realized daily …
Sustaining Corporate Growth Requires 'Big I' And 'Small I' Innovation, Knowledge@Smu
Sustaining Corporate Growth Requires 'Big I' And 'Small I' Innovation, Knowledge@Smu
Knowledge@SMU
All companies, from major multinationals to start-ups, face a common challenge: how to keep growing. These firms find it difficult to sustain growth because they become risk averse, opting for safer incremental product and service improvements instead of more rewarding, but riskier, major initiatives, according to a study by Wharton marketing professor George S. Day. Companies, Day says, need to better understand the risks inherent in different levels of innovation and achieve a balance between BIG I innovation and small i innovation.