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스프링식 장력조정장치의 스프링 절손시 그에 미치는 영향
윤용한(Yonghan Yoon),김낙경(Nakkyung Kim),김태수(Taesoo Kim) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
전기철도 시대에 있어서 전기차의 팬터그래프와 직접 접촉하여 전기를 공급하는 전차선로는 매우 중요한 설비이다. 스프링식 장력조정장치는 온도 변화에 따라 변하는 전차선의 장력을 스프링 탄성의 이용으로 일정한 크기로 유지하여 전기차의 집전 성능을 향상시키는 기능을 갖는다. 이와 같이 스프링식 장력조정장치는 기존 활차식 장력조정장치에 비해 유지보수비가 대폭 절감되는 장점으로 최근 많이 사용되고 있다. 스프링식 장력조정장치는 사용하는 스프링의 형태에 따라 코일 스프링식과 판 스프링식으로 나눌 수 있다. 이에 본 논문에서는 코일 스프링식 장력 조정장치와 판 스프링식 장력조정장치를 비교, 분석한다. 또한, 각각의 스프링식 장력조정장치를 구성하는 내부의 스프링이 절손되었을 경우를 상정하여 장력조정장치의 성능 변화를 분석하고, 이 변화가 가선 시스템에 미치는 영향을 검토하였다. The overhead contact line equipment, which feeds traction power to the electrical locomotive by contacting with the pantograph directly, plays important role in the train electrification system. The spring type automatic tensioning device(ATD) improves the current collecting performance of the train by maintaining the contact line tension varying due to temperature change at a constant level by spring elasticity. Thus, the spring type ATD is widely utilized due to its remarkable merit of low maintenance cost compared to the conventional wheel type ATD. Depending on the shape of spring, the spring type ATD can be categorized in coil type and spiral type. Hence, this paper is to compare and analyze the characteristics of both coil type ATD and spiral type ATD. Moreover, presuming breakage of the internal spring for each spring type ATD, this paper is to analyze the performance variation of the ATD, and by which the affection on the catenary system is to be reviewed.
윤용한 ( Yong Han Yoon ),김원태 ( Won Tae Kim ),박봉주 ( Bong Ju Park ),김현정 ( Hyun Jung Kim ) 한국녹지환경디자인학회 2007 녹지환경학회지 Vol.3 No.1
The present study examined how to improve soil from construction sites in order to reuse waste soil from construction sites, which is piled up at waste processing companies around the Sudokwon Landfill Site, as soil for planting. We selected calcium superphosphate and peat moss to resolve constraints in reusing waste soil for planting, and mixed 10.4kg of calcium superphosphate and 15L of peat moss with 1m3 of soil from construction sites. As a result, we could lower the acidity of the soil down to pH 6.5, the target of improvement of effective soil layer. We also increased organic matter contents but only up to around a fourth of 30g·kg-1, the target of improvement of organic matter contents. According to the results of herbaceous plant growth experiments using soil before and after improvement and mountain soil as a control, all seeds in mountain soil germinated within 7 days from sowing, but seeds in waste soil from construction site before and after improvement germinated 70% and 90%, respectively, on day 30 from sowing. In addition, compared to mountain soil, improved waste soil from construction site showed a difference of over 14 days in germination time. By sample soil, plant height on day 30 was 162mm in mountain soil, and next 15.0mm in improved soil, and 13.1mm in unimproved soil. Undried weight measured after the growth experiment was 6.811g per individual in mountain soil, and next 5.955g in improved soil and 5.616g in unimproved soil. The results show that the studied sample soil from construction sites can be reused as soil for planting through improvement. In addition, by accumulating research data like our results, we expect to supply soil demanded for the top soil layer of Sudokwon Landfill Site and the post-management of landfill sites and to solve environmental problems such as fly dust and spoiled landscape by abandoned heaps of waste soil from construction sites.
윤용한(Yong-Han Yoon),김원태(Won-Tae Kim),박봉주(Bong-Ju Park),김선주(Sun-Ju Kim),임병옥(Byeong-Ok Im),손진관(Jin-Kwan Son) 한국잡초학회·한국잔디학회 2006 Weed & Turfgrass Science Vol.20 No.1
본 연구는 수도권매립지 주변 건설폐기물 중간처리업체 내에 적재되어 있는 건설발생토의 유해물질 함량과 토양오염도를 측정하여 환경식재기반으로서의 활용 가능성에 대해서 검토하였다. 본 연구에 사용된 건설발생토의 유해물질 함량은 분석항목 모두 지정폐기물에 함유된 유해물질의 기준치 이내로 나타나 환경식재기반으로서의 재활용 가능성이 높은 것으로 나타났다. 토양오염도도 분석항목 모두 토양오염 우려기준을 초과하지 않는 것으로 나타났다. 잔디생육실험에 있어서도 건설 발생토는 식생토사로서의 활용 가능성이 있는 것으로 나타났다. This study was carried out to evaluate the recycled waste soils from construction site for using vegetation media. The concentrations of Cd, Pb, Cr??, As, Hg, Cu, Cn, organic P, TCE, and PCE were measured at recycled soil piles of an industrial waste treating company in the Metropolitan landfill area. The concentrations of polluted materials did not exceed to the standard critical levels of soil pollution in all analyzed items. The results suggested a high potential of recycling of the wastes soils for vegetation soil media. However, Cd and Cr?? almost reached the critical levels by the time of sampling, and it is necessary to develop a skill to lower concentrations of those pollutants. In the turfgrass test, the recycled soil did show an encouraging result as vegetation media in the early growth stage of perennial ryegrass.