Published papers

This paper proposes the session layer communication continuity support for Java applications toward a continuous operation for the users. In a mobile computing environment, mobile hosts move around the different network segments even during applications communicate with the remote endpoint. In such a situation, maintenance of the communication continuity between the applications is significant. In order to retain the communication continuity, not only the mobility support but the virtual circuit continuity support is required for applications. Existing approaches on the network, the transport and the session layers do not provide the complete mobility and virtual circuit continuity for applications, although they require the complicated implementation. "MobileSocket" is a user-level enhanced socket library written in Java, and provides the library-based session layer mobility and virtual circuit continuity support for applications. Two mechanisms, Dynamic Socket Switching (DSS) and Application Layer Window (ALW) enforce MobileSocket and enable the implementation simplicity. MobileSocket applications can be used in the Java mobile applications and the agents, as well as in ordinary network applications. In this paper, after we clarify the communication continuity and existing approaches, we present the MobileSocket design, mechanism, and evaluation results.

Currently, everyone can detect and store many life-log data very easily with the spread of smart phones or wearable devices and large scale data storage. Wide variety and large scale life-log data are very useful to self behavior change, medical care, education, and social analytics. Existing researches of human behavior change using life-log data focus on individual human behavior change. But nowadays everyone have communication equipment like smart phones. Group behavior change is very useful to keep workers' health in company and/or managing amount of practice in a sport team. Group has many kind of human relations, for example, manager and normal member. Therefore techniques for individual human behavior change is not effective to groups. The biggest aim of our research is to build the model of group behavior change. Specially, we focus on team behavior change. In this paper, we propose six types of group behavior model based on the "competition" and "collaboration" technique. We used encouraging team modification application in sports team and laboratory for keeping the sit-up exercise for 3 weeks. Sit-up exercise is very important to preventing the injury and keep fit for the sport team and the laboratory member. We create 8 groups in a team. We evaluate and consider this model based on the change of the self-efficacy and number of sit-up activities.