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전우석 ( Woo Seok Jeon ),이지현 ( Ji Hyun Lee ),박영민 ( Young Min Park ),이준영 ( Jun Young Lee ) 대한피부과학회 2014 大韓皮膚科學會誌 Vol.52 No.11
Background: Prurigo pigmentosa (PP) is a chronic recurrent dermatosis that occurs in young adults and is characterized by pruritic erythematous macules and papules that leave reticular hyperpigmentation. Although there have been a few comprehensive studies, the clinical characteristics and recurrence rates have not been fully elucidated. Objective: The purpose of this study was to evaluate the clinical findings and recurrence rates according to the factors associated with PP.Methods: We reviewed the medical records, photographs, and histopathological slides of 67 patients who were diagnosed with PP between March 2005 and March 2013. Statistical analysis was performed to compare the recurrence rates between the group without associated factors and the group with associated factors (contact, diet/ weight loss, and sweat, respectively). Results: PP associated with contact showed localized involvement and transverse direction of the lesions; however,the PP lesions associated with diet or weight loss showed diffuse involvement. PP associated with sweat showed a tendency to be distributed in the flexural area and depressed area with longitudinal direction of the lesions. The recurrence rate of the group with no associated factors was 45.7%, while that of the group with associated factors was 33.3%. Within this group, the recurrence rate was 23.1% (3/13) for the contact group, 27.3% (3/11) for the diet/weight loss group, and 50% (4/8) for the sweat group. However, the differences in recurrence rates were not statistically significant. Conclusion: We suspect that there are differences in the clinical characteristics according to the factors associated with PP. Although the differences in recurrence rates according to the factors associated with PP were not statistically significant, we suspect that further research with a larger sample size will show that the differences are in fact present. (Korean J Dermatol 2014;52(11):797∼801)
동해안 석호 담염수 혼합대에서 지하수와 지표수 상호작용의 수리지질학적 특성 평가
전우현,김동훈,이수형,황세호,문희선,김용철,Jeon, Woo-Hyun,Kim, Dong-Hun,Lee, Soo-Hyoung,Hwang, Seho,Moon, Hee Sun,Kim, Yongcheol 한국지하수토양환경학회 2021 지하수토양환경 Vol.26 No.6
This study examined hydrogeological characteristics of groundwater and surface water interaction in the fresh-saline water mixed zone of East Coast lagoon area, Korea, using several technical approaches including hydrological, lithological, and isotopic methods. In addition, the fresh-saline water interface was evaluated using vertical electrical conductivity (EC) data. For this purpose, three monitoring wells (SJ-P1, SJ-P2, and SJ-P3) were installed across the Songji lagoon at depths of 7.4 to 9.0 m, and water level, EC, and temperature at the wells and in the lagoon (SJ-L1) were monitored using automatic transducers from August 1 to October 21, 2021. Isotopic composition of the groundwater, lagoon water, and sea water were also monitored in the mid-September, 2013. The mixing ratios calculated from oxygen and hydrogen isotopic composition decreased with increasing depth in the monitoring wells, indicating saline water intrusion. In the study area, the interaction of groundwater-surface water-sea water was evident, and residual salinity in the sedimentary layers created in the past marine environment showed disorderly characteristics. Moreover, the horizontal flow at the lagoon's edge was more dominant than the vertical flow.
전우청(Woo-Cheong Jeon),이형식(Hyong-Sik Lee) 산업기술교육훈련학회 2011 산업기술연구논문지 (JITR) Vol.16 No.4
This experimental study presents Bingham properties under the flow mode. Among working modes of ER fluids the flow mode is considered in this study. In order to undertake this work, a flow mode type electro-viscometer is manufactured. The experimental setup is similar to the ER damper which is operated by the double-rod hydraulic cylinder. The electrode gap is chosen by 1.00㎜. The pressure drops in the viscometer are measured by two pressure sensors at each end of the electrode. The yield stresses are then obtained through analytical procedures. As for the ER fluid to be tested, two types of ER fluids are employed; soluble-arabic gum based ER fluid(I3S50), an ER fluid of Bayer. The first one is composed in-housingly. The pressure drops of ER fluids are measured by increasing the electric field from zero to maximum voltage in room temperature. Consequently, the yield stresses of the ER fluids are obtained. The significant factor of Bingham properties, ?? and ?? values, of all ER fluid in the flow mode appeared to be greater than that in the shear mode, exclusive of soluble-arabic gum based ER fluid. Therefore, the Bingham model applied to the application of flow-mode type of device, the results obtained from the flow-mode type of experiment should be used.
전우선(Jeon, Woo-Seon),이응현(Lee, Eung-Hyun),오덕성(Oh, Deog-Seong) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.4
본 연구는 저탄소 녹색도시의 조성을 위해 주요 계획부문과 계획기법을 살펴보고,그 적용실태를 파악해 봄으로서 저탄소 녹색도시 구현에 요구되는 계획적 주안점이 무엇인지 살펴보고자 하였다.이를 위해 저탄소 녹색도시 및 유사 개념에 대한 문헌 및 선행연구 고찰을 통해 주요 계획부문 및 계획요소를 정리하고,전문가 FGI분석을 통해 적합성을 검정하여 계획기법을 도출하였다.또한,전문가 설문조사와 AHP분석을 통해 계획기법의 중요도를 파악해 봄으로서 저탄소 녹색도시 계획의 주요 특성을 파악해 보았다.이와 함께 국내외 사례를 선정하여 도출한 계획기법의 적용실태를 분석하여 계획기법의 중요도와 비교해 봄으로서 계획과 실제의 차이를 살펴보고자 하였다.주요 계획기법으로는 5개 부문,15개의 계획기법을 도 출할 수 있었다.또한,이에 대한 중요도 분석과 사례분석을 종합해 보면,분산집중형 압축개발,보행친화적 교통체계,신재생 에너지 적극 활용,폐기물의 재활용 시스템 구축이 저탄소 녹색도시 계획의 주요한 요소로 파악되었다. The main objective of this study is to find out the main fields and methods to create a low carbon green city. Through the findings, we hope to figure out the matters that must be focused on in order to realize a low carbon green city. In order to accomplish this, we organized the main fields and methods of fulfilling this accomplishment by taking a look at recorded documents and past studies related to the creation of low carbon green cities and related concepts. Then a FGI analysis was performed in order to examine suitability and deduct a planning technique. Also, through professional surveys and AHP analysis, we figured out the importance of planning techniques to understand the main characteristics of planning a low carbon green city. We also selected domestic and foreign cases, analysed the actual conditions of applying the deducted planning techniques, and compared the importance of planning techniques in order to see the difference between our plans and real results. 15 planning techniques were deducted and divided into 5 groups. The importance analysis and case analysis showed the following to be the main elements in planning the creation of a low carbon green city: compact high-density development, a traffic system revolving around pedestrians, active utilization of new and renewable energy, and establishment of a recycling system for waste.