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formula (Yu and Singh, 2000). A mathematical
discussion with various scenarios was provided to
demonstrate the behavior of the new trust function.
The paper used a bottom-up approach to create a
new trust function; and it provided sample points
according to the function's behavior for certain
values of 8 constants used to parameterize our
approach. We also provided a quadratic
approximation to simplify calculation of the
function, with only minor cost in accuracy.
Alternative approximations would be needed if any
of the eight constants were changed.
Another important factor is to consider both
expertise (ability to produce correct answers) and
sociability (ability to produce accurate referrals) in
social networks. Usually, the goal of a trust
function is to calculate expertise, but we should also
consider another function for the calculation of
sociability. If we do so, then we can evaluate our
social networks by those two functions. As a future
work, we would like to work on the computation of
sociability. Our purpose is to evaluate social
behaviors of agents by considering both functions at
the same time and apply a two dimensional function
for this assessment.
ACKNOWLEDGEMENTS
We appreciate the anonymous reviewers for their
comments.
REFERENCES
Yu, B. and Singh, M. P., 2000. A social mechanism of
reputation management in electronic communities. In
Proceedings of Fourth International Workshop on
Cooperative Information Agents. pages 154–165.
Marti, S. and Carcia-Molina, H., 2004. Limited reputation
sharing in P2P systems. In Proceedings of the ACM
Conference on Electronic Commerce. pages: 91-101.
Yu, B. and Singh, M. P., 2002. Distributed reputation
management for electronic commerce. Computational
Intelligence, 18 (4): 535–549.
Mui, L., 2002. Computational models of trust and
reputation”. PhD thesis in Electrical Engineering and
Computer Science, MIT.
Yu, B., Singh, M. P. and Sycara, K., 2004. Developing
trust in large-scale peer-to-peer systems. In First IEEE
Symposium on Multi-Agent Security and Survivability.
Yolum, P. and Singh, M. P., 2004. Service graphs for
building trust. In Proceedings of the International
Conference on Cooperative Information Systems, (1):
509-525.
Yu, B. and Singh, M. P., 2003. Searching social networks.
In Proceedings of the 2nd International Joint
Conference on Autonomous Agents and Multi-Agent
Systems (AAMAS), ACM Press.
Song, S., Hwang, K., Zhou, R. and kwok, Y., 2005.
Trusted P2P transactions with fuzzy reputation
aggregation. IEEE Internet Computing, 9 (6): 24-34.
Sabater, J. and Sierra, C., 2002. Reputation and social
network analysis in multi-agent systems. In
Proceedings of First International Joint Conference
on Autonomous Agents and Multi-agent Systems,
pages 475–482.
Pujol, J. M., Sanguesa, R. and Delgado, J., 2002.
Extracting reputation in multi-agent systems by means
of social network topology. In Proceedings of First
International Joint Conference on Autonomous Agents
and Multi-agent Systems, pages 467–474.
Mui, L., Mohtashemi, M. and Halberstadt, A., 2002.
Notions of reputation in multi-agents systems: a
review. In Proceedings of First International Joint
Conference on Autonomous Agents and Multi-agent
Systems, pages 280-287.
Aberer, K. and Despotovic, Z., 2001. Managing trust in a
peer-2-peer information system. In Proceedings of the
Tenth International Conference on Information and
Knowledge Management (CIKM’ 01), pages 310-317.
Breban, S. and Vassileva, J., 2001. Long-term coalitions
for the electronic marketplace. In Proceedings of
Canadian AI Workshop on Novel E-Commerce
Applications of Agents, pages 6–12.
Tan, Y. and Thoen, W., 2000. An outline of a trust model
for electronic commerce. Applied Artificial
Intelligence, 14: 849–862.
Schillo, M., Funk, P. and Rovatsos, M., 2000. Using trust
for detecting deceitful agents in artificial societies.
Applied Artificial Intelligence, 14: 825–848.
Resnick, P., Zeckhauser, R., Friedman, E., and Kuwabara,
K., 2000. Reputation systems: facilitating trust in
internet interactions. Communications of the ACM, 43
(12): 45–48.
Brainov, S. and Sandholm, T., 1999. Contracting with
uncertain level of trust. In Proceedings of the First
International Conference on Electronic Commerce
(EC’99), pages 15–21.
Rea, T. and Skevington, P., 1998. Engendering trust in
electronic commerce. British Telecommunications
Engineering, 17 (3): 150–157.
Castelfranchi, C. and Falcone, R., 1998. Principle of trust
for MAS: cognitive anatomy, social importance, and
quantification. In Proceedings of Third International
Conference on Multi Agent Systems, pages 72–79.
Chavez, A. and Maes, P., 1996. Kasbah: An agent
marketplace for buying and selling goods. In
Proceedings of the 1st International Conference on
the Practical Application of Intelligent Agents and
Multi-agent Technology (PAAM), pages 75–90.
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