Hyungsu Lee

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The real-time tracking system is an essential component in the development of low cost sensor networks to be used in pervasive and ubiquitous computing. In this paper we address the interference problem of the sensor network platform that uses ultrasonic for location tracking. We also present a novel scheme reducing the error rate caused by interference,(More)
The development of wireless communication systems has resulted in the availability of several access technologies in any geographical area, such as 3G networks, wireless local area networks (WLANs), and wireless broadband networks. The development of these technologies is provided for users who have experienced mobile network environments which are slow or(More)
The recent development of mobile network technology resulted in commercialization of Long Term Evolution (LTE) network, opening the era when data can be processed at high speed even in the mobile. But a new authentication key must be created during the handover in the LTE network environment. In this case, the authentication process is performed by handover(More)
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