Jae-Myeong Choi

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Wireless communication networking technology plays an important part in supporting ubiquitous network. IT, BT and NT convergence of typical techniques for wireless body area network (WBAN) provides the quality and convenience. WBAN is classified in to non-medical field and medical field. In this paper, the techniques, applications and channel models of WBAN(More)
In this paper, refer to the digital multimedia mobile phone with the combination of broadcasting and the communication the unity of wire and wireless solution that can provide the UMA (unlicensed mobile access) function is added. In UNC(universal naming convention) in the case of CAS (conditional access system) is supported, the device (mobile phone) is(More)
4G wireless communication systems use OFDM modulation technique in order to provide reliable transmission in a propagation area. Issues of this scheme related with data lossless, low BER, PAPR and well-synchronization are quite essential for emergency circumstances; especially in the natural disaster events, it is strictly required precise information(More)
In this paper, we designed the digital narrowband communication system. It can apply at the special field in wireless channel environments. Also, It is a narrowband wireless communication system which uses UHF band. Thus, A system analysis performed using channel equalization and signal acquisition scheme for the effect of a fading and Frequency offset.
Many companies and organizations, especially governmental agencies have been classifying their documents according to strictly controlled security levels. In this paper, we present security technologies enabling to convert security levels of the secure documents between different security domains. If a higher security level document should be converted to a(More)
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