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이행남,박길문,모양우,이덕구,설재림,김건일 朝鮮大學校 機械技術硏究所 2004 機械技術硏究 Vol.7 No.2
The ejector is used to get low pressure, and it has been applied to a lot of industry field like the heat engine, the fluid instrument power plant, the food industry, environment industry etc. because there are not any problem even it is mixed with kinds of liquid, gas, and solid. The flow characteristics in diffuser are investigated by PIV and CFD. The agreement between numerical analysis and experiment shows the validity of this study and the results of this study would be useful to the engineers who design for the flow systems for heating, ventilation, air conditioning and wastewater purification plants.
이행남,박길문,이덕구,정한별,김건일,설재림 朝鮮大學校 機械技術硏究所 2005 機械技術硏究 Vol.8 No.1
The sirocco fan is used to get low noise, and it has been applied to a lot of industry field like the heat engine, the fluid instrument power plant, the food industry, environment industry etc... because there are not problems even it is mixed with a any kind of liquid, gas, and solid. The flow characteristics in sirocco fan are investigated by PIV. The experiment using PIV measurement for Test section's flow characteristics acquired velocity distribution, Condition : when sirocco fan in automobile air controller maximum 1450RPM, and a revolution is a variation (l)950RPM, (2)l100RPM, (3) 1250RPM. The agreement a experiment shows the validity of this study and the results of this study would be useful to the engineers who design for the flow systems
동결견(凍結肩) 환자의 동서협진 치료의 임상효과 비교연구 : 견관절 가동운동범위(ROM) 변화를 중심으로
남동우,김행범,양동훈,임사비나,김건식,이두익,이재동,최도영,이윤호 경희대학교 동서의학연구소 2006 東西醫學硏究所 論文集 Vol.2006 No.-
Objectives : To establish an effective collaborate medicine treatment of acupuncture and western medicine for treating frozen shoulder patients. Methods : 59 voluntary patients were randomly assigned to Eastern treatment group(E group, n=22), Western treatment group(W group, n=17) and East-West treatment group(EW group, n=20). The E group received acupuncture treatment on LI15, TE14, GB21 and Master Dong's acupuncture points, Shin-gwan and Gyun-joong, twice a week for 4 weeks. The W group received suprascapular nerve block, subacromial injection and trigger point injection, twice a week for 4 weeks. The EW group received acupuncture and injection treatment including nerve block. All groups were instructed to practice self exercise during their daily lives. Evaluations were made before treatment and after treatment based on the change in shoulder Range of Motion(ROM) and the patient's satisfaction concerning the treatment was measured by Visual Analogue Scale(VAS). The obtained data were analyzed and compared. Results : The patient's satisfaction scores were E group 5.67, W group 7.73 and EW group 7.67. The E group and the EW group showed significant improvement in abbduction, adduction and flexion(p<0.05). The W group showed significant improvement in adduction(p<0.05). Abduction significantly improved(p<0.05) in the EW group compared to E group and W group. Flexion also showed improvement in the EW group, but the difference among the 3 groups was statistically insignificant. The three group's difference of change in extension and adduction was insignificant(p>0.05). Conclusion : Acupuncture and nerve block alone significantly improved ROM in frozen shoulder patients. Also collaborate treatment of acupuncture and nerve block significantly improved ROM in frozen shoulder patients. But the difference of the three treatments were significant only for improving abduction(p<0.05).
대리변수를 이용한 한반도 수질 및 수생태계 부문의 기후변화 취약성 평가
이건행 ( Keon Haeng Lee ),정유진 ( Eu Gene Chung ),김경현 ( Kyung Hyun Kim ),유정아 ( Jeong Ah Yu ),이은정 ( Eun Jeong Lee ) 한국물환경학회 ( 구 한국수질보전학회 ) 2012 한국물환경학회지 Vol.28 No.3
This study aims at assessing vulnerability of water quality and aquatic ecosystem to climate change by using proxy variables. Vulnerability to climate change is defined as a function of exposure to climate, sensitivity, and adaptive capacity. Detailed proxy variables were selected considering availability and then standardized by re-scaling concept. After adequate weights were assigned to standardized proxy variables by Delphi technique, vulnerability index was calculated. As results, vulnerability of adjacent regions to coastal areas include water quality and aquatic ecosystem is relatively higher than that of inland areas, and especially adjacent region to the western and southeast seas, and Jeju show high vulnerabilities. Vulnerability in the future was performed based on A1B scenario (IPCC, 2000). Temporally, the increase of vulnerability from 2050s to 2100s may be larger than the increase from 2000s to 2050s. Because vulnerability index was estimated through the relationship among various proxy variables, it is important to consider characteristics of local region with measurements and policies for reduction of sensitivity and enhancement of adaptive capacity on climate change. This study is expected to be useful in planning adaptation measures and selecting priority to the policy on climate change.
Common Land Model의 국내 적용성 평가를 위한 유량 및 지면온도 모의
이건행 ( Keon Haeng Lee ),최현일 ( Hyun Il Choi ),권현한 ( Hyun Han Kwon ),김상단 ( Sang Dan Kim ),정유진 ( Eu Gene Chung ),김경현 ( Kyung Hyun Kim ) 한국물환경학회 2013 한국물환경학회지 Vol.29 No.2
A grid based configuration of Land Surface Models (LSMs) coupled with a climate model can be advantageous in impact assessment of climate change for a large scale area. We assessed the applicability of Common Land Model(CoLM) to runoff and land surface temperature (LST) simulations at the domain that encompasses the Nakdong river basin. To establish a high resolution model configuration of a 1km * 1km grid size, both surface boundary condition and atmospheric inputs from the ob served weather data in 2009 were adjusted to the same resolution. The Leaf Area Index (LAI) was collected from MODerate resolution Imaging Spectroradiometer (MODIS) and the downward short wave flux was produced by a nonstationary multi site weather state model. Compared with the observed runoffs at the stations on Nakdong river, simulated runoffs properly responded to rainfall. The spatial features and the seasonal variations of the domain fairly well were captured in the simulated LSTs as well. The monthly and seasonal trend of LST were described well compared to the observations, however, the monthly averaged simulated LST exceeded the observed up 2 at the 24 stations. From the results of our study, it is shown that high resolution LSMs can be used to evaluate not only quantity but also quality of water resources as it can capture the geographical fcatures of the area of interest and its rainfall runoff response.
다차원 홍수피해산정방법을 이용한 도시지역의 홍수피해액 산정
이건행(Lee Keon Haeng),최승안(Choi Seung An),김형수(Kim Hung Soo),심명필(Shim Myung Pil) 대한토목학회 2006 대한토목학회논문집 B Vol.26 No.4B
우리나라에서는 치수사업을 추진하기 위한 경제성 분석으로 간편법과 개선법을 사용하여 오다가 현재는 2004년도에 개발된 다차원법(다차원 홍수피해 산정방법(Multi-Dimensional Flood Damage Analysis))을 이용하고 있다. 다차원법은 도시와 농촌 등의 구분없이 일반적으로 이용할 수 있도록 개발되었는데 본 논문에서는 도시지역에 적합하도록 다차원법의 홍수피해 산정 요소들을 보정하여 적용하고자 하였다. 즉, 다차원법에서 제시하고 있는 피해액 산정 항목들 중 도시지역 분석을 위해 일부를 보정 또는 제안하였다. 본 연구에서 제안하는 항목은 배수펌프장의 내수배제능력을 고려해 침수모의를 수행하여 침수 예상지역에 대한 침수심을 산정하는 것이다. 그리고 보정한 항목으로는 산업지역의 피해, 공공시설물의 피해율 등에 대한 것으로 도시지역의 피해액 산정을 위해 수정하여 적용하였다. 도림천의 지하방수로 사업의 비용-편익비를 산정하여 비교한 결과, 다차원법을 이용한 경우 5.51, 본 연구에서 제시한 비주거지역 자산과 공공시설물의 피해율을 이용한 경우는 6.75의 비용-편익비를 추정할 수 있었다. 이는 피해액 항목들 중, 많은 비중을 차지하는 공공시설물피해 항목에 의한 영향의 크기 때문인 것으로 판단된다. A simple and an improved methods for the economic analysis of the flood control project has been in previous studies in Korea. In 2004, the Multi-Dimensional Flood Damage Analysis (MD-FDA) was developed and now it is widely used for the economic analysis of flood control project. However, the MD-FDA was developed for general damage assessment and analysis without consideration of specific regional characteristics such as urban and rural areas. To compensate the MD-FDA for the application in urban area, a part of damage estimation components is modified and a component for the flood damage estimation is suggested. The component we suggest is for the consideration of the capability of storm water pump stations in the study area. When flood is occurred in the urban area, the damage potential is larger than the rural area because of the concentration of human lives and properties. So, many storm water pump stations are located in the urban area and the inundation depth is estimated by considering the capabilities of pump stations. We also compensate the damage components such as the damages of industrial area, and public facilities for the flood damage estimation of the urban area. The results by the compensated MD-FDA for the urban area application with those by original MD-FDA are compared. As a result the B/C ratio showed 6.75 and 5.51 respectively for the modified and original MD-FDA. This difference might be largely affected by the damage rate of the public facilities.