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-In this paper, we propose a capacity modeling method for Bluetooth based LBSs (Location Based Services) between Bluetooth APs(Access Points) and mobile phones. In order to do this, we consider the entrance and exit of the users to and from the AP. Using parameters such as the connection time, data transmission time and number of users in the AP zone, we analyze the capacity of a Bluetooth AP using an appropriate queuing model. The required number of APs in a certain zone is estimated from the number of users in the zone using the proposed queuing model. By performing simulations and experiments, the validity and applicability of the proposed method are verified.

Although the closed caption broadcasting is provided for almost the whole broadcast time in Korea, the sign language interpretation is not. By translating the closed captions, it is possible to provide three-dimensional (3D) sign language translations for more broadcast time. We propose a sign language broadcasting system for weather forecasts, and extend it for all kind of TV programs. In order to find the frequency of each word, we analysed the last three years' weather forecast scripts, and an opendomain corpus of about 1.2 million words from KBS. We use the Korean wordnet, KorLex, to build the sign language synonym dictionary, and for the word sense disambiguation to improve the translation performance. Optically-captured sign language motions are used for the 3D avatar to present sign language with motion blending. We developed a mobile ondemand sign language weather forecast application, and a real-time sign language interpretation system for all kind of TV programs.