I am currently a senior research scientist at School of Computer Science and Engineering, Nanyang Technological University, Singapore. Address: Singapore
2012 IEEE/WIC/ACM International Conferences on Web Intelligence and Intelligent Agent Technology, 2012
Crowd sourcing (CS) systems offer a new way for businesses and individuals to leverage on the pow... more Crowd sourcing (CS) systems offer a new way for businesses and individuals to leverage on the power of mass collaboration to accomplish complex tasks in a divide-and-conquer manner. In existing CS systems, no facility has been provided for analyzing the trustworthiness of workers and providing decision support for allocating tasks to workers, which leads to high dependency of the quality of work on the behavior of workers in CS systems as shown in this paper. To address this problem, trust management mechanisms are urgently needed. Traditional trust management techniques are focused on identifying the most trustworthy service providers (SPs) as accurately as possible. Little thoughts were given to the question of how to utilize these SPs due to two common assumptions: 1) an SP can serve an unlimited number of requests in one time unit, and 2) a service consumer (SC) only needs to select one SP for interaction to complete a task. However, in CS systems, these two assumptions are no longer valid. Thus, existing models cannot be directly used for trust management in CS systems. This paper takes the first step towards a systematic investigation of trust management in CS systems by extending existing trust management models for CS trust management and conducting extensive experiments to study and analyze the performance of various trust management models in crowd sourcing. In this paper, the following key contributions are made. We 1) propose extensions to existing trust management approaches to enable them to operate in CS systems, 2) design a simulation test-bed based on the system characteristics of Amazon's Mechanical Turk (AMT) to make evaluation close to practical CS systems, 3) discuss the effect of incorporating trust management into CS system on the overall social welfare, and 4) identify the challenges and opportunities for future trust management research in CS systems.
2009 7th International Conference on Information, Communications and Signal Processing (ICICS), 2009
ABSTRACT Recent advances in ultra lightweight communications and sensor devices have ushered in a... more ABSTRACT Recent advances in ultra lightweight communications and sensor devices have ushered in a new range of applications to incorporate location awareness into mission critical situations such as remote health monitoring of chronically ill patients or emergency response personnel. However, in an open environment where these devices could potentially operate in the future, reliable and accurate positioning may depend on not just the robustness of the hardware or the software system, but also their resistance to various malicious tempering. This paper takes a cross-disciplinary view to apply the knowledge from studying the phenomenon of trust and reputation among humans to improve the reliability of beacon based positioning for body area sensor networks. We propose a novel uncertainty based trust model to improve the effectiveness of an evidence-based trust model against collusion and discuss the preliminary findings from our early stage empirical studies.
2009 IEEE/WIC/ACM International Joint Conference on Web Intelligence and Intelligent Agent Technology, 2009
In this paper, we propose an agent planning system based on the Goal Net model. The agent’s goals... more In this paper, we propose an agent planning system based on the Goal Net model. The agent’s goals are identified and organized in a composite goal hierarchy. Three kinds of relations between goals are defined: choice, concurrency and synchronization. Actions between goals are designed to accomplish subsequent goals. The agent’s desire is satisfied by accomplishing a serial of intermediary goals
2008 Eighth IEEE International Conference on Advanced Learning Technologies, 2008
... This raises the hurdle to develop non-trivial agent augmented interactive e-learning applicat... more ... This raises the hurdle to develop non-trivial agent augmented interactive e-learning applications. ... Nowadays, the emphasis on the learning experience has been ushered in with the concept of the virtual learning environment (VLE) which drastically differs from the traditional rote ...
2012 IEEE/WIC/ACM International Conferences on Web Intelligence and Intelligent Agent Technology, 2012
Crowd sourcing (CS) systems offer a new way for businesses and individuals to leverage on the pow... more Crowd sourcing (CS) systems offer a new way for businesses and individuals to leverage on the power of mass collaboration to accomplish complex tasks in a divide-and-conquer manner. In existing CS systems, no facility has been provided for analyzing the trustworthiness of workers and providing decision support for allocating tasks to workers, which leads to high dependency of the quality of work on the behavior of workers in CS systems as shown in this paper. To address this problem, trust management mechanisms are urgently needed. Traditional trust management techniques are focused on identifying the most trustworthy service providers (SPs) as accurately as possible. Little thoughts were given to the question of how to utilize these SPs due to two common assumptions: 1) an SP can serve an unlimited number of requests in one time unit, and 2) a service consumer (SC) only needs to select one SP for interaction to complete a task. However, in CS systems, these two assumptions are no longer valid. Thus, existing models cannot be directly used for trust management in CS systems. This paper takes the first step towards a systematic investigation of trust management in CS systems by extending existing trust management models for CS trust management and conducting extensive experiments to study and analyze the performance of various trust management models in crowd sourcing. In this paper, the following key contributions are made. We 1) propose extensions to existing trust management approaches to enable them to operate in CS systems, 2) design a simulation test-bed based on the system characteristics of Amazon's Mechanical Turk (AMT) to make evaluation close to practical CS systems, 3) discuss the effect of incorporating trust management into CS system on the overall social welfare, and 4) identify the challenges and opportunities for future trust management research in CS systems.
2009 7th International Conference on Information, Communications and Signal Processing (ICICS), 2009
ABSTRACT Recent advances in ultra lightweight communications and sensor devices have ushered in a... more ABSTRACT Recent advances in ultra lightweight communications and sensor devices have ushered in a new range of applications to incorporate location awareness into mission critical situations such as remote health monitoring of chronically ill patients or emergency response personnel. However, in an open environment where these devices could potentially operate in the future, reliable and accurate positioning may depend on not just the robustness of the hardware or the software system, but also their resistance to various malicious tempering. This paper takes a cross-disciplinary view to apply the knowledge from studying the phenomenon of trust and reputation among humans to improve the reliability of beacon based positioning for body area sensor networks. We propose a novel uncertainty based trust model to improve the effectiveness of an evidence-based trust model against collusion and discuss the preliminary findings from our early stage empirical studies.
2009 IEEE/WIC/ACM International Joint Conference on Web Intelligence and Intelligent Agent Technology, 2009
In this paper, we propose an agent planning system based on the Goal Net model. The agent’s goals... more In this paper, we propose an agent planning system based on the Goal Net model. The agent’s goals are identified and organized in a composite goal hierarchy. Three kinds of relations between goals are defined: choice, concurrency and synchronization. Actions between goals are designed to accomplish subsequent goals. The agent’s desire is satisfied by accomplishing a serial of intermediary goals
2008 Eighth IEEE International Conference on Advanced Learning Technologies, 2008
... This raises the hurdle to develop non-trivial agent augmented interactive e-learning applicat... more ... This raises the hurdle to develop non-trivial agent augmented interactive e-learning applications. ... Nowadays, the emphasis on the learning experience has been ushered in with the concept of the virtual learning environment (VLE) which drastically differs from the traditional rote ...
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