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Articles 21451 - 21480 of 23193
Full-Text Articles in Entire DC Network
Flexible Verification Of Mpeg-4 Stream In Peer-To-Peer Cdn, Tieyan Li, Yongdong Wu, Di Ma, Robert H. Deng
Flexible Verification Of Mpeg-4 Stream In Peer-To-Peer Cdn, Tieyan Li, Yongdong Wu, Di Ma, Robert H. Deng
Research Collection School Of Computing and Information Systems
The current packet based stream authentication schemes provide effective and efficient authentication over a group of packets transmitted on erasure channels. However, by fixing the packets in transmission, any packet manipulation will cause authentication failure. In p2p content delivery network where a proxy-in-the-middle is able to store, forward, transcode and transform the stream, previous schemes are simply unapplicable. To address the problem, we propose a flexible verification scheme that relies on special stream formats (i.e. Unequal Loss Protection ULP scheme [7]). We apply the so called Unequal Loss Verification ULV scheme into MPEG-4 framework. The encoding, packing, amortizing and verifying …
Trust Establishment In Large Scale Grid Settings, Bo Zhu, Tieyan Li, Huafei Zhu, Mohan S . Kankanhalli, Feng Bao, Robert H. Deng
Trust Establishment In Large Scale Grid Settings, Bo Zhu, Tieyan Li, Huafei Zhu, Mohan S . Kankanhalli, Feng Bao, Robert H. Deng
Research Collection School Of Computing and Information Systems
Trust establishment is hard in grid architecture by the ad hoc nature. To set up trust in large scale of network is more difficult. In this paper, we propose an automatic key management (AKM) model and corresponding key construction schemes. The hierarchical structure is formed automatically and scale seamlessly in arbitrary network sized. Regions are configured differently according to various levels of risks faced. The novel model provides an integrated solution for self-organized trust establishment, upon which rich appliances are securely supported. It is automatic, flexible, and scalable. Furthermore, simulation results show that computation costs due to the variations are …
Design And Analysis Of A Cooperative Medium Access Scheme For Wireless Mesh Networks, Arup Acharya, Archan Misra, Sorav Bansal
Design And Analysis Of A Cooperative Medium Access Scheme For Wireless Mesh Networks, Arup Acharya, Archan Misra, Sorav Bansal
Research Collection School Of Computing and Information Systems
This paper presents the detailed design and performance analysis of MACA-P, a RTS/CTS based MAC protocol, that enables simultaneous transmissions in wireless mesh networks. The IEEE 802.11 DCF MAC prohibits any parallel transmission in the neighborhood of either a sender or a receiver (of an ongoing transmission). MACA-P is a set of enhancements to the 802.11 MAC that allows parallel transmissions in situations when two neighboring nodes are either both receivers or transmitters, but a receiver and a transmitter are not neighbors. The performance of MACA-P in terms of system throughput is obtained through a simulation of the protocol using …
Chaos-Induced Escape Over A Potential Barrier, L. Y. Chew, Hian Ann, Christopher Ting, C. H. Lai
Chaos-Induced Escape Over A Potential Barrier, L. Y. Chew, Hian Ann, Christopher Ting, C. H. Lai
Research Collection Lee Kong Chian School Of Business
We investigate the statistical parity of a class of chaos-generated noises on the escape of strongly damped particles out of a potential well. We show that statistical asymmetry in the chaotic fluctuations can lead to a skewed Maxwell–Boltzmann distribution in the well. Depending on the direction of skew, the Kramers escape rate is enhanced or suppressed accordingly. Based on the Perron–Frobenious equation, we determine an analytical expression for the escape rate’s prefactor that accounts for this effect. Furthermore, our perturbative analysis proves that in the zeroth-order limit, the rate of particle escape converges to the Kramers rate.
The Role Of Manufacturing Flexibility On Product Platform Development, Soumen Ghosh, Byung Joon Park
The Role Of Manufacturing Flexibility On Product Platform Development, Soumen Ghosh, Byung Joon Park
Research Collection Lee Kong Chian School Of Business
In recent years firms from a range of industries have responded to growing market uncertainty by investing heavily in manufacturing flexibility. Manufacturing Flexibility is understood as process flexibility, that is a process that results from being able to build different types of products on the same production line at the same time. One benefit of manufacturing flexibility is the reduction of change over cost from building one product to another. Flexible manufacturing also relieves the problem of overcapacity, since excessive overcapacity could be avoided through the introduction of flexible manufacturing plants. Recently, firms have examined a new concept of enabling …
Exploitation, Exploration, And Firm Performance: The Case Of Small Manufacturing Firms In Japan, Takehiko Isobe, Shige Makino, David B. Montgomery
Exploitation, Exploration, And Firm Performance: The Case Of Small Manufacturing Firms In Japan, Takehiko Isobe, Shige Makino, David B. Montgomery
Research Collection Lee Kong Chian School Of Business
The purpose of this study is to investigate the relationship between technological capabilities and firm performance. We divide technological capabilities into two types – exploitation, which refers to refinement, production and execution, and exploration, which refers to searching, flexibility, and innovation. Based on a sample of 302 small and medium-sized manufacturing firms in Japan, our analysis reveals that exploitation relates more positively to operational efficiency than exploration, and conversely, exploration relates more positively to strategic performance, such as technological innovation and new product development, than exploitation. Moreover, firms with superior exploitation capabilities tend to possess superior exploration skills. Our findings …
How To Make Knowledge Management A Dynamic Capability, Arun Kumaraswamy, Raghu Garud
How To Make Knowledge Management A Dynamic Capability, Arun Kumaraswamy, Raghu Garud
Research Collection Lee Kong Chian School Of Business
No abstract provided.
The Contribution Of A Satellite Market To Price Discovery: Evidence From The Singapore Exchange, Vicentiu Covrig, David K. Ding, Buen Sin Low
The Contribution Of A Satellite Market To Price Discovery: Evidence From The Singapore Exchange, Vicentiu Covrig, David K. Ding, Buen Sin Low
Research Collection Lee Kong Chian School Of Business
The Singapore Exchange (SGX), a small satellite market, successfully competes with a large home market, the Osaka Securities Exchange (OSE), in trading the Nikkei 225 futures index. In this paper, we investigate the contribution of the SGX to price discovery and shed light on the reasons for its continued success. Evidence is provided from information revelation and price discovery of three competing but informationally linked markets of the Nikkei 225 index - domestic spot (Tokyo Stock Exchange), domestic futures (OSE), and foreign futures (SGX), which represents the satellite market. Overall, the futures market contributes 77% to price discovery, with the …
Prospect Theory, Analyst Forecast, And Stock Returns, David K. Ding, Charlie Charoenwong, Raymond Seetoh
Prospect Theory, Analyst Forecast, And Stock Returns, David K. Ding, Charlie Charoenwong, Raymond Seetoh
Research Collection Lee Kong Chian School Of Business
This paper documents how prospect theory can be used to explain stock returns and analysts' forecast behavior. Positive earnings surprises are associated with increases in abnormal returns but negative earnings surprises have only a limited negative impact on returns. We find that analysts display asymmetric behavior towards positive and negative earnings growth. Analysts' forecasts are found to be accurate during periods of positive earnings growth, but overly optimistic during periods of negative earnings growth. Our findings have implications for the structuring of investment products, as well as the role of market timing in their introduction.
Measuring Marketing Productivity: Current Knowledge And Future Directions, Roland T. Rust, Tim Ambler, Gregory S. Carpenter, V. Kumar, Rajendra Kumar Srivastava
Measuring Marketing Productivity: Current Knowledge And Future Directions, Roland T. Rust, Tim Ambler, Gregory S. Carpenter, V. Kumar, Rajendra Kumar Srivastava
Research Collection Lee Kong Chian School Of Business
For too long, marketers have not been held accountable for showing how marketing expenditures add to shareholder value. As time has gone by, this lack of accountability has undermined marketers' credibility, threatened the standing of the marketing function within the firm, and even threatened marketing's existence as a distinct capability within the firm. This article proposes a broad framework for assessing marketing productivity, cataloging what is already known, and suggesting areas for further research. The authors conclude that it is possible to show how marketing expenditures add to shareholder value. The effective dissemination of new methods of assessing marketing productivity …
Learning To Live A Life That's Full, Seow Hon Tan
Learning To Live A Life That's Full, Seow Hon Tan
Research Collection Yong Pung How School Of Law
No abstract provided.
Modular Production Networks In Electronics: The Nexus Between Management And Economics Research, Byron Gangnes, Ari Van Assche
Modular Production Networks In Electronics: The Nexus Between Management And Economics Research, Byron Gangnes, Ari Van Assche
Research Collection School Of Economics
In the last two decades, the electronics industry has evolved from a vertically integrated industry to a vertically segmented one. This transformation has often been attributed to the modularization of electronic products. In this paper, we argue that the degree of modularity is an active choice variable for a firm. As a result, it is necessary to focus on the underlying factors that drive both modularity and the organization of production. This provides insights into the transformation taking place in global electronics production, with vertical fragmentation, horizontal consolidation, and the growth of Asian electronics production.
A Social Exchange Model Of Subordinate's Trust In Supervisors, Wei Hua
A Social Exchange Model Of Subordinate's Trust In Supervisors, Wei Hua
Research Collection Lee Kong Chian School Of Business
This study demonstrates how the subordinate’s defensiveness predicts perception of managerial behaviors, which in turn leads to trust in supervisors. From a social information processing perspective, defensiveness, the affective reaction to uncertainty and vulnerability, serves as the frame subordinates use to decode and evaluate managerial behaviors. Trust in supervisors is anchored in this perception. A two-group analysis in Structural Equation Modeling (SEM) is used to test this model by a Chinese and a US sample
The Antecedents Of Value Creation In Singapore Corporation, Wee Liang Tan, Teck Meng Tan
The Antecedents Of Value Creation In Singapore Corporation, Wee Liang Tan, Teck Meng Tan
Research Collection Lee Kong Chian School Of Business
The impetus for value creation has led to greater interest in encouraging entrepreneurship within organizations (intrapreneurship). The intrapreneurship literature reveals general agreement that organizational entrepreneurship flourishes where the environmental conditions of an organization are most favorable. However, there is little empirical research examining the relationship of the organizational climate and the intentions of employees to be intrapreneurs, and their actual participation in such activities. This paper reports a study on the elements of organizational climate on intrapreneurship attitudes, intentions and actions on the part of middle managers in corporations in Singapore.
The Making Of An Innovator, Hian Teck Hoon
The Making Of An Innovator, Hian Teck Hoon
Research Collection School Of Economics
Innovators experiment with things to come up with new ideas to improve the quality of existing products, develop differentiated or new products and re-organise business processes to lower costs. In a big corporation, there might be a whole R&D department where innovators are employed to design new blueprints so the company can constantly make new offerings. But innovators can also be found in small enterprises tinkering with recipes, for example, to win new customers. Innovators no doubt derive pleasure from their creative work. Yet, in modern economies, they must be employed in a firm that successfully translates their innovative activity …
Academic Year 2004 Welcomes Smu’S Largest Intake Of Students, Singapore Management University
Academic Year 2004 Welcomes Smu’S Largest Intake Of Students, Singapore Management University
SMU Press Releases and News
No abstract provided.
A Development Framework For Rapid Metaheuristics Hybridization, Hoong Chuin Lau, M. K. Lim, W. C. Wan, S. Halim
A Development Framework For Rapid Metaheuristics Hybridization, Hoong Chuin Lau, M. K. Lim, W. C. Wan, S. Halim
Research Collection School Of Computing and Information Systems
While meta-heuristics are effective for solving large-scale combinatorial optimization problems, they result from time-consuming trial-and-error algorithm design tailored to specific problems. For this reason, a software tool for rapid prototyping of algorithms would save considerable resources. This work presents a generic software framework that reduces development time through abstract classes and software reuse, and more importantly, aids design with support of user-defined strategies and hybridization of meta-heuristics. Most interestingly, we propose a novel way of redefining hybridization with the use of the "request and response" metaphor, which form an abstract concept for hybridization. Different hybridization schemes can now be formed …
A Two-Level Framework For Coalition Formation Via Optimization And Agent Negotiation, Hoong Chuin Lau, Lei Zhang
A Two-Level Framework For Coalition Formation Via Optimization And Agent Negotiation, Hoong Chuin Lau, Lei Zhang
Research Collection School Of Computing and Information Systems
We present a two-level coalition formation approach based on a centralized optimization model on the upper level, and a distributed agent-negotiation model on the lower level. This approach allows us to balance agent self-interests against a high joint utility. Experimental results show that the two-level coalition formation mechanism will increase not only the overall utility of the coalition, but also the individual utility of most participating agents. The results also suggest it is better for the agents to be partially cooperative rather than either fully cooperative or self-interested in our setting.
Sclope: An Algorithm For Clustering Data Streams Of Categorical Attributes, Kok-Leong Ong, Wenyuan Li, Wee-Keong Ng, Ee Peng Lim
Sclope: An Algorithm For Clustering Data Streams Of Categorical Attributes, Kok-Leong Ong, Wenyuan Li, Wee-Keong Ng, Ee Peng Lim
Research Collection School Of Computing and Information Systems
Clustering is a difficult problem especially when we consider the task in the context of a data stream of categorical attributes. In this paper, we propose SCLOPE, a novel algorithm based on CLOPE's intuitive observation about cluster histograms. Unlike CLOPE however, our algorithm is very fast and operates within the constraints of a data stream environment. In particular, we designed SCLOPE according to the recent CluStream framework. Our evaluation of SCLOPE shows very promising results. It consistently outperforms CLOPE in speed and scalability tests on our data sets while maintaining high cluster purity; it also supports cluster analysis that other …
Is The Good Life The Easy Life?, Christie N. Scollon, Laura A. King
Is The Good Life The Easy Life?, Christie N. Scollon, Laura A. King
Research Collection School of Social Sciences
Three studies examined folk concepts of the good life. Participants rated the desirability and moral goodness of a life as a function of the happiness, meaning, and effort experienced. Happiness and meaning were solid predictors of the good life, replicating King and Napa (1998). Study 1 (N = 381) included wealth as an additional factor. Results showed little desire for exorbitant (over moderate) wealth, but also a desire to avoid poverty. When effort was operationalized as number of hours worked, respondents desired the easy life, particularly at moderate levels of income. When effort was operationalized as effortful engagement (Study 2), …
A Spectroscopy Of Texts For Effective Clustering, Wenyuan Li, Wee-Keong Ng, Kok-Leong Ong, Ee Peng Lim
A Spectroscopy Of Texts For Effective Clustering, Wenyuan Li, Wee-Keong Ng, Kok-Leong Ong, Ee Peng Lim
Research Collection School Of Computing and Information Systems
For many clustering algorithms, such as k-means, EM, and CLOPE, there is usually a requirement to set some parameters. Often, these parameters directly or indirectly control the number of clusters to return. In the presence of different data characteristics and analysis contexts, it is often difficult for the user to estimate the number of clusters in the data set. This is especially true in text collections such as Web documents, images or biological data. The fundamental question this paper addresses is: ldquoHow can we effectively estimate the natural number of clusters in a given text collection?rdquo. We propose to use …
Shared-Storage Auction Ensures Data Availability, Hady W. Lauw, Siu-Cheung Hui, Edmund M. K. Lai
Shared-Storage Auction Ensures Data Availability, Hady W. Lauw, Siu-Cheung Hui, Edmund M. K. Lai
Research Collection School Of Computing and Information Systems
Most current e-auction systems are based on the client-server architecture. Such centralized systems provide a single point of failure and control. In contrast, peer-to-peer systems permit distributed control and minimize individual node and link failures' impact on the system. The shared-storage-based auction model described decentralizes services among peers to share the required processing load and aggregates peers' resources for common use. The model is based on the principles of local computation at each peer, direct inter-peer communication, and a shared storage space.
A Qualitative Investigation On Consumer Trust In Mobile Commerce, Keng Siau, Hong Sheng, Fiona Fui-Hoon Nah, Sidney A. Davis
A Qualitative Investigation On Consumer Trust In Mobile Commerce, Keng Siau, Hong Sheng, Fiona Fui-Hoon Nah, Sidney A. Davis
Research Collection School Of Computing and Information Systems
Mobile commerce represents a significant development in e-commerce, offering accessibility, ubiquity, mobility, and localisation to users. Despite the potential of mobile commerce, trust is a major obstacle in its adoption and development. Many consumers feel uncomfortable with the idea of conducting commerce over wireless, hand-held devices. The focus of this research is to understand trust in mobile commerce and to identify factors that are important for trust development. The research builds on Siau and Shen's framework which depicts two key factors influencing trust in mobile commerce. This research not only validates and expands on the existing framework, but also provides …
A Visual Language For Animating Sketches, Richard C. Davis, James A. Landay
A Visual Language For Animating Sketches, Richard C. Davis, James A. Landay
Research Collection School Of Computing and Information Systems
We present our research into visual languages for animating sketches. Animation is a rich mode of communication that is currently accessible to few. Simple animation systems exist, but severely restrict the types of motion that can be represented. Our field studies are demonstrating that would-be animators need to coordinate many objects moving in a variety of ways. The visual language described here allows a variety of motions to be defined with hand gestures, and gives visual feedback for coordination of events. This may open up computerized communication to users who think in dynamic visual images.
The Economy And Demand For Finance Ph.D.S: 1989-2001, David K. Ding, Sheng-Syan Chen
The Economy And Demand For Finance Ph.D.S: 1989-2001, David K. Ding, Sheng-Syan Chen
Research Collection Lee Kong Chian School Of Business
We investigate the demand for new finance Ph.D.s from 1989 to 2001. Three categories of schools (Top 20, Top 21-50, and Other Finance Departments) are explored and the differences between private and public institutions are reported. The demand for assistant professors is the greatest and most institutions require an earned Ph.D. While most do not specify the position type, there is some evidence that tenure-tracked ones are on the rise. The most desired areas of expertise are corporate/business finance, investments, and bank management/financial markets and institutions. The total demand is positively related to the Gross Domestic Product and Dow Jones.
Silence, Procrustes And Colonization: A Response To Clegg Et Al.'S 'Noise, Parasites And Translation: Theory And Practice In Management Consulting', Andrew Sturdy, Timothy Adrian Robert Clark, Robin Fincham, Karen Handley
Silence, Procrustes And Colonization: A Response To Clegg Et Al.'S 'Noise, Parasites And Translation: Theory And Practice In Management Consulting', Andrew Sturdy, Timothy Adrian Robert Clark, Robin Fincham, Karen Handley
Research Collection Lee Kong Chian School Of Business
The article by Clegg, Kornberger and Rhodes in March 2004’s issue of Management Learning is a refreshing and welcome contribution to an otherwise largely sterile, atheoretical and overly prescriptive literature on management consulting. However, and sadly, it stops very short of offering a critique and therefore generating substantially novel insights into this phenomenon. Also, and despite the authors’ assertions otherwise, it ends up celebrating consultancy as a privileged arena in achieving what is described as radical change, but what is, in effect, typically a reinforcement of existing power relations and of managerialism and its associated language.This response comes from a …
Risk, Return And Risk Aversion: A Behavioral Rendition, Hian Ann, Christopher Ting
Risk, Return And Risk Aversion: A Behavioral Rendition, Hian Ann, Christopher Ting
Research Collection Lee Kong Chian School Of Business
Behavioral finance and classical finance based on utility maximization appear to be mutually exclusive schools of thought. Despite the fundamental difference, we show that behavioral finance also has a linear relation between risk and return. This relation is obtained without the assumptions of market equilibrium, rational expectations, a specific utility function and the market portfolio. In the behavioral approach, the pricing error of CAPM is not an error. It is attributable to the higher-order moments of return. Empirical tests suggest that the relative risk aversion coefficient is positive and time-varying. Moreover, it correlates negatively with both volatility and return.
Information Contents Of Trade And Quote Imbalances, And The Hypothesis Of Reverse Liquidity, Hian Ann, Christopher Ting
Information Contents Of Trade And Quote Imbalances, And The Hypothesis Of Reverse Liquidity, Hian Ann, Christopher Ting
Research Collection Lee Kong Chian School Of Business
In this paper, we study the information contents of imbalances in trades and quotes emanated from an exchange resembling the one envisioned by Black (1971). We find dollar volume is more informative than number in measuring daily trading and quoting activities. Our measure of quote imbalance permits an investigation on the information asymmetry between market and limit orders. In case illegal insider trading does not occur regularly, we present a hypothesis of reverse liquidity as an alternative interpretation for our empirical findings. It could be that market-order traders charge an implicit liquidity premium for fulfilling the contrarian trading demand of …
Confirmatory Factor Analysis And Invariance Of An Organizational Citizenship Behaviour Measure Across Samples In A Dutch-Speaking Context, Filip Lievens, Frederik Anseel
Confirmatory Factor Analysis And Invariance Of An Organizational Citizenship Behaviour Measure Across Samples In A Dutch-Speaking Context, Filip Lievens, Frederik Anseel
Research Collection Lee Kong Chian School Of Business
Although Organizational Citizenship Behaviour (OCB) has been studied extensively over the years in the US, the measurement of OCB has received relatively limited attention in other international contexts. This study investigates the dimensionality of a specific OCB measure in a Dutch-speaking context (Flemish part of Belgium). In addition, we examine the invariance of this measure across two different samples: supervisor ratings of 259 subordinates and peer ratings of 215 employees. Generally, we found clear support for the discriminant validity of five OCB factors but convergent validity was only established for three of the five factors. This measurement structure found was …
Models Of Electoral System Change, Kenneth Benoit
Models Of Electoral System Change, Kenneth Benoit
Research Collection School of Social Sciences
Electoral systems are commonly treated as exogenous determinants of political party systems, yet our theoretical understanding remains limited as to how these institutions themselves are determined. Part of the problem lies with the subject matter itself: electoral system change is frequently idiosyncratic, often occurring during episodes of exceptional political change. Yet another aspect of the problem is that explanations of electoral system change frequently occur piecemeal in application to specific cases, without systematic or comparative development. Addressing both problems, I first survey the existing literature to develop a comprehensive typology of explanations of electoral system change and persistence. I then …