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저상 고상 승강장 겸용 승강시스템 기술개발에 관한 연구 : 시제품의 내구성시험 결과를 중심으로
박민흥(Min Heung Park),최덕호(Duck Ho Choi),김철수(Chul Su Kim) 한국철도학회 2012 한국철도학회 학술발표대회논문집 Vol.2012 No.5
국내 여객을 취급하는 철도역사의 승강장은 간선철도노선의 저상승강장(500mm)과 광역전철구간의 고상승강장(1135mm)으로 구분 운용되고 있다. 철도산업의 변화 및 발전에 대처하기 위하여 고상승강장으로의 표준화가 논의되고 있는 시점에서 저상전용 중·고속열차가 수도권 전철구간(고상승강장)과 본선구간(저상승강장)에서 혼용 운영될 경우를 대비하고 안전운전 및 승객편의를 함께 고려하기 위해 저상 고상 승강장 겸용 승강시스템의 개발은 필수적이다. 승강문의 경우 KS규격에 내구성 시험 기준이 명시되어 있으나, 본 연구에서 개발 중인 시스템(스텝)에 대한 내구성 시험 기준은 현재 존재하지 않는다. 이에 무고장 시험시간 및 보증시험 개념을 도입하고 신뢰성 척도를 결정하여 내구성 시험횟수를 이론적으로 산출하였고 이를 토대로 수행한 시험결과에 대하여 고찰하고자 한다. In this study, durability test of doorstep equipment for both the low and the high level platforms under development was carried out to increase the reliability of the system. Currently, durability test criteria of door system is stated as 300,000 times in Standard but that of the doorstep under development does not exist. Therefore with the concept of Zero Failure Test Time and Reliability Qualification Test, we determined the measure for reliability and calculated theoretically durability test time. we completely performed the durability test and reviewed the results.
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신현철,조수현,최덕호 순천향대학교 기초과학연구소 1997 순천향자연과학연구 논문집 Vol.3 No.2
To understand the floral characteristics of Dogo river and its vicinity, the plants distributed along Dogo river were collected at 10 sites from July to October, 1997. From this investigation, it is confirmed that 113 taxa, including 15 naturalized taxa, were distributed at Dogo river and its vicinity. Among them, 12 taxa were hydrophytes, 25 taxa were wetplant and 76 taxa were waterside plants. The plants of four taxa, including Commelina communis, Humulus japonicus, Persicaria thunbergii, and Bidens frondosa, were distributed at 8 sites, and those of 57 taxa were distributed only at one site.
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백서 대퇴직근의 재관류 손상에 있어 Mn-Superoxide dismutase의 면역 활성 및 Allopurinol 전처치가 미치는 영향
황치원,최덕호,조근렬,백두진 大韓成形外科學會 1999 Archives of Plastic Surgery Vol.26 No.2
It has been well known that ischemia reperfusion injury to skeletal muscle following an acute arterial occlusion causes significant morbidity and mortality. There are many causes of reperfusion injury, but the oxygen free radicals have a significant role. During ischemia the ATP is catalyzed to hypoxanthine anaerobically and hypoxanthine dehydrogenase is converted to xanthine oxidase under the presence of O₂ resulting in the production of cytotoxic oxygen free radical, which are harmful to muscle. The reactivity of superoxide dismutase(SOD), one of the major antioxidant enzymes, is increased against the formation of the superoxide radical during reperfusion. SOD metabolyzes the superoxide radical to H₂O₂ and O₂.The severity of ischemic damage deports on the duration of muscle ischemia. The reversible changes in the muscle occur afar 2 hours of ischemia and recover within 24 hours after reperfusion. After 6 hours ischemia, irreversible damage occurs and causes necrosis of muscle. The authors performed the resent study to investigate the changes of Mn-SOD and the effects of allopurinol, the inhibitor of xanthine oxidase, by measuring the immunoreactivitiy of the ischemic reperfused rectus femoris muscle of rats after 2 hours and 6 hours ischemia and timely reperfusion. A total of 176 healthy spraque-Dawley rats weighing from 200 gm to 250 gm were used. Under urthane(3.0 gm/kg.,IP) anesthesia, a lower-abdominal incision was made and the left common iliac artery was ligated by using a vascular clamp for 2 hours and 6 hours. Rectus femoris muscle was obtained at 0 hour, 1 hour, 2 hours, 24 hours, and 48 hours after removal of the vascular clamp. The specimens were sectioned in 14㎛ thickness with a cryostat. The immunoreactivities of Mn-SOD were observed by using Mn-SOD antibodies. The result were as follows. 1. The immunoreactivies of Mn-SOD around sarcolemma were stronger than those on the sarcoplasm. 2. The immunoreactivities of Mn-S0D after 2 hours of ischemia increased to moderate or weak reactivities at 1 hour and 2 hours of reperfusion and returned to week or trace reactivities at 24 hours and 48 hours of reperfusion 3. The pretreatment of allopurinol decreased the immunoreactivies of Mn-SOD during reperfusion. The pattern of changes of SOD immunoreactivies were similar, but the range of changes significantly decreased. 4. The immunoreactivies of Mn-SOD after 6 hours of ischemia increased after 6 hours of ischemia increased after reperfusion and showed peak at 2 hours and 24 hours specimen. After 48 hours in the reperfused group, the reactivities slightly decreased. 5. After 6 hours in the ischemia-reperfused group, the pretreatment of allopurinol decreased the immunoreactivies of Mn-SOD during reperfusion, but the effects were weak. These results suggest that the immunoreactivities of the 6 hours ischemia reperfused group were higher than those of 2-hours ischemia reperfused group in the rectus femoris muscle of rats and that allopurinol pretreatment can be credited with decreasing ischemia reperfusion injury within a reversible period.
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