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A Performance Enhanced UHF RFID System with Modified I/Q Diversity Receiver
전기용,윤창석,조성호,Jeon, Ki-Yong,Yoon, Chang-Seok,Cho, Sung-Ho The Korea Institute of Information and Commucation 2008 韓國通信學會論文誌 Vol.33 No.7A
In this paper, we propose a modified I/Q diversity scheme receiver of UHF RFID reader system. The modified I/Q diversity receiver is more robust than the conventional homodyne receiver in the wireless noisy, fading channel and phase noise environments by making use of additional axes. In particular, it is shown that the closer the phase difference ${\theta}(t)$ between the reader and the tag to ${\pi}/4$, the larger performance improvement we can get. The performance of the proposed receiver is verified by equations and is demonstrated by the computer simulation for various difference ${\theta}(t)$ cases.
A Performance Enhanced UHF RFID System with Modified I/Q Diversity Receiver
Ki Yong Jeon(전기용),Chang Seok Yoon(윤창석),Sung Ho Cho(조성호) 한국통신학회 2008 韓國通信學會論文誌 Vol.33 No.7A
In this paper, we propose a modified I/Q diversity scheme receiver of UHF RFID reader system. The modified I/Q diversity receiver is more robust than the conventional homodyne receiver in the wireless noisy, fading channel and phase noise environments by making use of additional axes. In particular, it is shown that the closer the phase difference θ(t) between the reader and the tag to π/4, the larger performance improvement we can get. The performance of the proposed receiver is verified by equations and is demonstrated by the computer simulation for various difference θ(t) cases.
학술연구 : 벤처기업 경영성과의 영향요인에 관한 탐색적 연구
박영배(Young Bae Park),윤창석(Chang Seok Yoon) 한국중소기업학회 2001 기업가정신과 벤처연구 Vol.4 No.1
This study investigated impacts of the characteristics of entrepreneur, environment, competitive strategies, and organizational characteristics on the performance of venture business. For empirical data for this study, 101 leading venture business written in Economist and 349 companies registered in Small & Medium Business Administration(SMBA) are sampled and surveyed as subjects. And the valid questionnaries being recollected totaled to 91. The factor analysis, cluster analysis, multiple regression analysis, one-way ANOVA, and T-test were used for the data analysis. The results of this study indicate that the performance of venture business is determined by characteristics of entrepreneur(need for achievement, motivation and age of entrepreneur), environmental characteristics, competitive strategies, and organizational characteristic(task autonomy). These results also indicate that the key elements play a major role in the performance of Korean Venture business. Theoretical and practical implications of these results were discussed in the conclusion.