tailieunhanh - Báo cáo hóa học: " Research Article Broadcasted Location-Aware Data Cache for Vehicular Application"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Broadcasted Location-Aware Data Cache for Vehicular Application | Hindawi Publishing Corporation EURASIP Journal on Embedded Systems Volume 2007 Article ID 29391 11 pages doi 2007 29391 Research Article Broadcasted Location-Aware Data Cache for Vehicular Application Kenya Sato 1 Takahiro Koita 1 and Akira Fukuda2 1 Department of Information Systems Design Doshisha University 1-3 Tatara-Miyakodani Kyotanabe-Shi Kyoto 610-0321 Japan 2 Graduate School of Information Science and Electrical Engineering Kyushu University 744 Motooka Nishi-Ku Fukuoka 819-0395 Japan Received 15 October 2006 Revised 7 March 2007 Accepted 17 April 2007 Recommended by Gunasekaran S. Seetharaman There has been increasing interest in the exploitation of advances in information technology for example mobile computing and wireless communications in ITS intelligent transport systems . Classes of applications that can benefit from such an infrastructure include traffic information roadside businesses weather reports entertainment and so on. There are several wireless communication methods currently available that can be utilized for vehicular applications such as cellular phone networks DSRC dedicated short-range communication and digital broadcasting. While a cellular phone network is relatively slow and a DSRC has a very small communication area one-segment digital terrestrial broadcasting service was launched in Japan in 2006 high-performance digital broadcasting for mobile hosts has been available recently. However broadcast delivery methods have the drawback that clients need to wait for the required data items to appear on the broadcast channel. In this paper we propose a new cache system to effectively prefetch and replace broadcast data using scope an available area of location-dependent data and mobility specification a schedule according to the direction in which a mobile host moves . We numerically evaluate the cache system on the model close to the traffic road environment and implement the emulation system to evaluate this location-aware data