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윤용한(Yoon Yong-Han),양병남(Yang Byong-Nam) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
전차선은 장력을 균일하게 유지하기 위하여 전차선 인류구간의 양측에 자동장력 조정장치를 사용하고 있으나 풍압, 팬터그래프의 접동, 전차선 자신의 온도변화에 따른 신축 등에 의하여 선로의 한쪽 방향으로 이동하는 경우가 있다. 이와 같이 한쪽 방향으로 전차선이 흐르는 것을 방지하기 위하여 전차선로에 흐름방지장치를 설치한다. 본 논문은 스프링식 자동장력 조정장치의 흐름방지장치 설치 여부와 선로의 경사 구간에서 스프링식 자동장력 조정장치의 설치시 장력 조정 방법에 관한 것이다. 본 논문의 결과에 따라서 전차선로에서 스프링식 자동장력 조정장치의 올바른 설계 및 시공, 유지보수가 가능할 것이다. To keep equal tension in contact wire, automatic tensioning device has been used at both ends of each strain section, but contact wire has a tendency of moving toward one direction by wind pressure, touch of pantograph, and elasticity of contact wire due to the temperature difference. To prevent a tendency of moving toward one direction in contact wire, mid point device has been installed in catenary. This paper describes the installation of mid point device in spring type tensioning device and the method for adjusting tension in installing spring type tensioning device at gradient section. According to the result of this paper in catenary, we can make it possible to design, construct, and maintain the spring type tensioning device properly.
윤용한(Yoon Yong-Han),임금광(Yim Geum-Kwang),양병남(Yang Byoung-Nam) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper presents a suggestion for improvement of droppers. To prevent circulation currents in trolly wire system, we developed a new type of elastic droppers and validated/verified its function. In this paper, therefore, we introduced a developed elastic dropper and analyzed economical efficiency of it.
윤용한(Yoon Yong-Han),임금광(Yim Geum-Kwang),양병남(Yang Byoung-Nam) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper presents a suggestion for improvement of cantilever. We developed a new type of cantilever and validated/verified its function. In this paper, therefore, we introduced a developed cantilever and analyzed economical efficiency of it.
윤용한(Yoon Yong-Han),임금광(Yim Geum-Kwang),한양규(Han Yang-Gyu) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper presents examples of trolley wire resistance influential on the movement of tensioning devices. Therefore, this study is on the examples of trolley wire resistance which keep tensioning devices from working properly to the expansion and contraction in accordance with temperature change of overhead trolley wire system such as messenger wire and contact wire. Trolley wire resistance interrupts the working of tensioning device and drops the capacity of trolley wire. Reduced trolley wire capacity lowers the performance of current collection and has a bad effect on electrical train operation. So it is desirable to reduce the factors increasing trolley wire resistance to the minimum from the designing and construction stage of overhead trolley wire system. This study will introduce this problem and suggest the solution.
고농도 염화칼슘 농도처리에 따른 토양개량제와 구절초의 염분저감 상승효과
윤용한,양지,박제민,주진희,Yoon, Yong-Han,Yang, Ji,Park, Je-Min,Ju, Jin-Hee 한국환경과학회 2021 한국환경과학회지 Vol.30 No.10
This study aimed to investigate the effects of soil amendment (heat-expanded clay and active carbon) and planting of Dendranthema zawadskii var. latilobum on the remediation of salt-affected soil and the plant growth under high calcium chloride (CaCl<sub>2</sub>) concentration. The experimental group comprised treatments including Non treatment (Cont.), heat-expanded clay (H), active carbon (AC), planting (P), heat-expanded clay+planting (H+P), active carbon+planting (AC+P). A 200 mL solution of CaCl<sub>2</sub> at a concentration of 10 g·L<sup>-1</sup> was applied as irrigation once every 2 weeks. Compared to the Cont., the incorporation of the 'heat-expanded clay' amendment decreased electrical conductivity of the soil leachate and cation exchange capacity, whereas the growth of Dendranthema zawadskii var. latilobum was relatively increased. These results suggest that the combination of 'heat-expanded clay' amendment and planting will mitigate negative effect of de-icing salts and improve plant growth in salt-contaminated roadside soils.
저관리형 옥상녹화 식물생육을 위한 Hydrophilic polymer의 효용성
양지 ( Ji Yang ),윤용한 ( Yong Han Yoon ),주진희 ( Jin Hee Ju ) 한국환경생태학회 2014 한국환경생태학회지 Vol.28 No.3
This study aimed to determine effects of the use of water-retention additive, hydrophilic polymer, for extensive green roofs on growth of Juniperus chinensis var. sargentii and Euonymus fortunei ‘Emerald and Gold’ for woody plants, and Carex kobomugi and Carex pumila for herbaceous plants. Five different contents of hydrophilic polymer including 0% (Control), 1.0%, 2.5%, 5.0%, and 10% (polymer: medium (w/w), dry weight basis) were added to each of the container filed with a 100 kg of growth medium. Ten of plants were transplanted in each of square container (1m (L)×1m (W)×0.3m (H)) built on the roof platforms in randomized complete block design in the 20th of May, 2013. In results, excessively high volumetric soil water content, about 97-98%, was found in the substrate under elevated hydrophilic polymer concentration of at least 2.5%, during the entire growing period. The moisture content of the substrate containing 1.0% of hydrophilic polymer was higher about 20% in the range between 70% and 80%, compared tho that of Control substrate in the range between 50% and 60%, for 27 days after transplanting prior to abundant rainfall, indicating that the application of hydrophilic polymer to the extensive green roof substrate is effective to eliminate drought condition by retaining water in the substrate. Euonymus fortunei ‘Emerald and Gold’ and Carex kobomugi resulting in higher plant growth with 2.5% than those of the other treatment plants. Juniperus chinensis var. sargentii was observed the highest growth under 1.0% hydrophilic polymer treatement, and Carex pumila was founded the best growth with Control respectively. Plants that grown in both the 1.0% and 2.5% hydrophilic polymer survived all, while the plants that grown in the 5.0% and 10% hydrophilic polymer died after 3 months. These results suggest that advantage of the addition of hydrophilic polymer may be greater in drought-tolerant plants, but the mixture proportion of hydrophilic polymer should be determined according to the different features of the plant species being grown.
염화물계 제설제의 농도처리에 따른 벼과와 국화과의 종자 발아특성
양지 ( Ji Yang ),이재만 ( Jae-man Lee ),송희연 ( Hee-yeon Song ),박선영 ( Sun-young Park ),윤용한 ( Yong-han Yoon ),주진희 ( Jin-hee Ju ) 한국환경과학회 2019 한국환경과학회지 Vol.28 No.11
This study aims to identify the most tolerant species under salinity stress from amongst Asteraceae and Poaceae. The seeds of six species were exposed to different concentrations of CaCl<sub>2</sub> (0, 9, 18, 45, 90 mM) and NaCl (0, 17, 34, 85, 170 mM), and germination was measured once every two days. The results indicated that percent germination of the six species of Asteraceae and Poaceae seeds were affected differently by changes in salinity concentration. Seed germination was reduced as salinity levels increase, and longer mean germination times correlated to lower percent germination and earlier germination cessation. Both Asteraceae and Poaceae seeds had the highest germination rates at 18 mM CaCl<sub>2</sub> and 34 mM NaCl, and seed germination and growth were severely reduced at salinities greater than 90 mM CaCl<sub>2</sub> and 170 mM NaCl. In the seeds of Poaceae, salt resistance was strong in the order of Miscanthus sinensis Andersson, Pennisetum alopecuroides (L.) Spreng., and Phragmites communis Trin. In the seeds of Asteraceae, salt resistance was strong in the order of Dendranthema zawadskii var. latilobum (Maxim.) Kitam, Aster yomena (Kitam.) Honda, and Dendranthema boreale (Makino) Ling ex Kitam.. Overall, the germination rate was higher in Asteraceae than in Poaceae. This study demonstrated that Dendranthema zawadskii var. latilobum (Maxim.) Kitam. is the most tolerant species and that a relationship exists between the salt tolerance of percent germination and the mean germination time in the leaves.
김원태 ( Won Tae Kim ),윤용한 ( Yong Han Yoon ),조용현 ( Yong Hyeon Cho ),강희경 ( Hee Kyoung Kang ),박봉주 ( Bong Ju Park ),신경준 ( Kyung Jun Shin ),어양준 ( Yang Joon Eo ),윤택승 ( Taek Seong Yoon ),장광은 ( Kwang Eun Jang ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.11
This study was carried out to evaluate the physicochemical properties of topsoil from forest development area. The results of physicochemical properties of topsoil from forest development area shown on the average loamy sand~sandy clay loam in soil texture, 5.3~7.1 in pH, 0.02~0.18 dS/m in EC, 0.7~1.8% in OM, 0.03~0.11% in T-N, 11~15 cmol+/kg in CEC, 0.02~0.04 cmol+/kg in K+, 4.51~8.18 cmol+/kg in Ca2+, 0.93~2.77 cmol+/kg in Mg2+, 6~49 mg/kg in available phosphate. And the results of physicochemical properties of topsoil from forest non-development area shown on the average sandy loam~sandy clay loam in soil texture, 4.4~5.3 in pH, 0.03~0.05 dS/m in EC, 3.1~4.6% in OM, 0.13~0.23% in T-N, 14~18 cmol+/kg in CEC, 0.02~0.04 cmol+/kg in K+, 0.78~3.82 cmol+/kg in Ca2+, 0.29~1.31 cmol+/kg in Mg2+, 3~31 mg/kg in Av. P2O5. On the other hand, forest development area of topsoil sand content higher than 8~18% sand content than the forest non-development area. This trend is thought to be the absence of topsoil management development projects. Consequently, the results suggested a high potential of recycling of the topsoil from forest non-development area for planting soil. Therefore, in construction of the conservation and management of topsoil from forest non-development area is very important.