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윤천주,유선열 전남대학교 치과대학 2000 전남치대논문집 Vol.12 No.1
This study was performed to investigate the changes of nerve after the injection of alcohol and glycerol at the infraorbital nerve in rats. Using the eighteen Sprague-Dawley rats, weighing 200-250g, 99% alcohol, pure glycerol, and sterile saline was injected to the epineurium of the infraorbital nerve. Glycerol injected rats were devided into 0.01㎖, 0.03㎖ and 0.05㎖ groups. The alcohol and control group were injected 0.03㎖ at the left infraorbital nerve. The following results were obtained by histopathological examination after 1 week, 1 month, and 3 months. A few inflammatory cell infiltration and no signs of nerve degeneration were noted in control group. Total nerve degeneration was noted in the alcohol group and no regeneration was noted in 1 month, and partial regeneration was noted at 3 month. The nerve degeneration was noted at the periphery of nerve bundle in 0.01㎖ glycerol injection group. Total degeneration was noted in the 0.03㎖and 0.05㎖ glycerol injection group. These results suggest that injection of alcohol and glycerol are effective to nerve blockage by nerve degeneration, and nerve degeneration by glycerol injection is propotional to dose and nerve regeneration by glycerol injection is inversely propotional to dose.
윤천주,김영록,성정곤 한국도로학회 2021 도로 : 도로학회지 Vol.23 No.3
PURPOSES : The purpose of this study is to review a method to estimate the average travel speed of the Bus Rapid Transit(BRT) section using the bus departure and arrival time data collected using the Korean bus information system (BIS). METHODS : To determine an average travel speed estimation model suitable for the BRT system in Korea, the speed estimated using the speed estimation model of TCQSM, which is used in the U.S., and that using the proposed speed estimation model that used the bus departure and arrival time data were compared with the actual travel speed using a t-test. RESULTS : The average travel speed estimated using the proposed method was more suitable for the actual average travel speed than that estimated using the TCQSM model. CONCLUSIONS : As a result of estimating the average travel speed, if the length of the link is 900 m, SBRT can be constructed on the existing road, but at least 1,200 m must be ensured to build SBRT in the new city. The proposed bus average travel speed estimation model can be used to review the BRT operational efficiency considering the speed limit, traffic signal, and dwelling time at bus stops in the planning and operation stages of the BRT.
윤천주,고해신,김갑중,최병석,최중선,Youn, C.J.,Ko, H.,Kim, K.J.,Choi, B.S.,Choe, J.S. 한국전자통신연구원 2018 전자통신동향분석 Vol.33 No.6
A quantum key distribution (QKD) provides in principle an unconditional secure communication unlike the standard public key cryptography depending on the computational complexity. In particular, free-space QKD can give a secure solution even without a fiber-based infrastructure. In this paper, we investigate an overview of recent research trends in the free-space QKD system, including satellite and handheld moving platforms. In addition, we show the key components for a free-space QKD system such as the integrated components, single photon detectors, and quantum random number generator. We discuss the technical challenges and progress toward a future free- space QKD system and components.