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저전력의 eMTC 시스템에 적합한 동기화 오차 추정 기법
정용안(Yong-An Jung),변상봉(Sang-Bong Byun),조수현(Soo-Hyun Cho),이성훈(Sung-Hun Lee) 한국정보기술학회 2020 한국정보기술학회논문지 Vol.18 No.10
A major issue of machine type communication (MTC) is to serve a better coverage enhancement with low-power consumption for Internet of Things (IoT) devices. Due to the restriction on total power allowed for transmission, it is necessary to estimate frequency offset in low signal to noise ratio (SNR) like as -15dB. In this paper, an improved frequency offset detection scheme is proposed for low-power IoT devices in the cellular-based eMTC system. The repetitive character of the physical broadcast channel (PBCH) symbols and the channel estimation based weight are considered for the improved frequency offset estimation. It is demonstrated that the proposed estimator is more efficient for coverage enhancement of eMTC devices by computer simulation.
축구선수들이 선호하는 지도행동유형에 따른 선수만족 및 경기력의 관계
정용안(Yong An Jung) 한국사회체육학회 2009 한국사회체육학회지 Vol.0 No.38
The main purpose of this research is to analyze the differences between the high school soccer players preference according to leader type behaviour. Also, the investigation of the relationship between the athletes` satisfaction and performance and how it effects the leader behavior. The reason is to learn about how to improve the athletes` satisfaction and performance in competition. The result are as follows; First, there were significant differences in soccer players` preference to a leader`s behavior type according to socio-demographic variables. Second, the player`s preference of leader style had a partially statistically influence on athletes` satisfaction. Third, the player`s preference of leader style had a partially statistically influence on performance.