Jae Hoon Choi

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High power efficiency and low nonlinear distortion is very important for wireless visible light communication system. OFDM (orthogonal frequency division multiplexing) system has been studied a lot as the method to transmit high speed data in wireless visible light communication system. However, OFDM system has drawbacks which are non-linear distortion by(More)
Social network sites (SNSs) have attracted millions of users who interact with each other and with companies. However, few studies have examined the impact of knowledge sharing through electronic word of mouth (eWOM) in the context of SNSs. This paper investigates the relationship among the use of SNSs, users' social capital, knowledge sharing, and eWOM.(More)
Wikis are interactive Web 2.0 tools that enable collaboration and knowledge sharing. Wiki-enabled collaboration is ideal in an educational setting, yet is prone to free-riding. This study examined the impact of the relational social capital of undergraduate students on their wiki usage and free-riding in a group project. Preliminary findings reveal that(More)
Wireless communication and mobile computing devices are using the wildly. These devices basically work in battery power. It is very important to calculate and apply the power consumption and furthermore to develop nice feasible techniques for reducing the power consumption of wireless communication devices. RF and analog parts in the mm-wave and EHF(More)