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Our ultimate goal is to develop an information diffusion system where individuals are motivated to create content and share it with public. As our first step, in this paper, we present an incentive-rewarding mechanism for social networking services and focus particularly on changing reward assignment ratio considering different risks users perceive when uploading content with different privacy settings:...
Distributed denial of service (DDoS) attacks still remains as one of the largest concerns for online businesses. Although an HTTPS compatible scheme is necessary for many online services, several previously proposed defense schemes fail to combine both HTTPS compatibility with practicality. In this paper, a novel defense architecture that blocks malicious traffic far from the protected servers is...
Single professionals and small companies come together and form virtual communities to compete with global players. In these collaboration networks, the actual business partners are discovered and alliances formed on demand. However, it is impossible for single members to keep track of the dynamics in large-scale networks. With the wide adoption of service-oriented architectures (SOA), interactions...
Recent proliferation of Wireless LAN devices has created a high demand for roaming systems that enable network connections at visited institutions using users' home accounts. We have been operating eduroam, the roaming system for international research and educational institutions. However, if the roaming system is to be introduced into more than a thousand of research and educational institutions...
This paper is a report on a case study of the use of Facebook to augment an undergraduate Korean language teacher education class through discussions and use of student-generated data. Results showed that students had positive attitudes toward the use of Facebook for class discussion compared to the comprehensive Blackboard e-learning system, mainly because of the ease of sharing and the integration...
In this paper, we propose a trust estimation method for a parson by the rating of his or her active audience of social web such as Twitter. We call this method 'trust by the rating of a persona's active audience.' A 'persona', such as 'Display Name' of Twitter (with additional authentication) or 'Claimed ID' of OpenID, denotes an artificial identity to represent one's social position in the user-centric...
In this paper, we propose an overlay authentication network for active utilization of private information. The proposed network realizes safe registration and usage of users' private information. In addition, the proposed network realizes the distributed management and utilization of users' private information. These features enable services which utilize users' private information. In this paper,...
Recent use of web services has spread over a wide variety of application areas. Users are requested to disclose private information for the use of web services. Such a disclosure is facing the risk of leaking private information. Privacy leakage is becoming one of the serious social problems. For the better use of web services, it is necessary to provide a reliable scheme for privacy management. There...
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