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[전기철도] 노후 활차식 자동장력조정장치 정밀분해 진단분석 연구
박병곤(Byung-Gon Park),오완식(Wan-Shik Oh),서기범(Ki-Bum Seo) 대한전기학회 2019 전기학회논문지 Vol.68 No.5
The contact wire used in the electric railways is expanded and contracted according to the as a function of temperature, and the tension on the contact wire would be changed due to the elastic expansion caused by aging and abrasion. In the case of outdoor temperature rising, the contact wire would be expanded, and the tension on the wire decreased, then sagging of the contact wire could be occurred. When the pantographs of the rolling stock come through the section of contact wire sagged, the contact wire could be broken consequently because of the incomplete contact and arc caused by vibration of the overhead, and expedited abrasion on the contact wire and pantograph. On the other way, the outdoor temperature dropping, the tension on the contact wire would be increased and the wire lifted up. Then it harms the equilibrium of the contact wire, and constant electricity collection of the pantograph. In this study a diagnostic analysis with precise decomposition for the decrepit wheel type automatic tensioning device(2 ton) accorded with the KRS-PW 0010-18(R) was carried out and tried to figure out the operation status of the device, and to identify the possibility of life time extension and the aging changes, so that the maintenance policy optimized for the tensioning device would be suggested through this study.
생물학적 모니터링을 이용한 분무기 형태에 따른 피레스로이드 농약 노출량 평가
송재석(Jae Seok Song),최홍순(Hong Soon Choi),유호영(Ho Young Yu),박병곤(Byung Gon Park),권대호(Daeho Kwon) 한국농약과학회 2016 농약과학회지 Vol.20 No.4
The aim of this study were to evaluate the exposure level of pyrethroid pesticide according to spraying machine type. The urinary metabolites of pyrethroid pesticide in apple farmers were analyzed to determine the exposure level of pyrethroid pesticide. The result shows that, the spraying volume was greater in SS sprayer group than in power sprayer group. But multi variate analysis which adjust spraying volume and field area, there were no difference of urinary metabolites between two sprayer machine. To make more accurate model of pesticide exposure, the factors influencing pesticide exposure should be determined and further study should be done.
고속철도 전차선로 드로퍼 클램프 내구성 기준 정립에 관한 연구
오완식(Wan-Shik Oh),양인동(In-Dong Yang),박병곤(Byung-Gon Park),홍석진(Seok-Jin Hong),김성철(Seong-Cheol Kim) 대한전기학회 2017 전기학회논문지 Vol.66 No.9
The high-speed railway of catenary system, supplies a stable electric power supply to the train by satisfying the special conditions between pantograph and trolley wire, which operates more than 250㎞/h mutually sliding and feeding electric lines. According to Korean Railway Standard KRS PW 0026-13 (R), the standard for the grip strength of the dropper clamp in conventional line is established, but the high-speed railway line is not yet. When the grip strength of the dropper clamp is detached from the catenary line of the high-speed railway line, various problems may occur, such as damage to the pantograph due to the collision and arcing. In this paper, it is expected to be used as a basic data for establishing the durability criteria of the high-speed railway dropper clamp by verifying the dropper clamp on the Gyeong-bu and Honam high-speed line.