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유진상,Yu, Jin-Sang 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.2
A more efficient method for obtaining the fatigue life enhancement of a structure member with fastener holes is described. It is based on the combined process of cold-expansion and ring-indentation. Residual stresses were induced onto premachined holes using ring-indentation process near the fastener hole combined with cold-expansion. And residual stresses at the vicinity of a hole were evaluated using a fracture mechanics approach. The compressive residual stresses were larger using the combined process than is in the case of simple cold-expansion. Fatigue testing of aluminum specimens showed that the fatigue crack growth retardation emanating from a circular hole was greater for the combined process than for a simple cold-expansion alone.
유진상(Yu, Jin-Sang) 대한건축학회 2012 대한건축학회논문집 Vol.28 No.12
Bicycle road which is beside main road in central city is effective regarding long distance connect effectiveness but continuity of drive is not that great. However bicycle road can contribute to share distribution ratio of public transportation due to high accessibility to the central city. This study suggested the improvement ways which are the continuity of bicycle drive, behavior of bicycle users, structure of bicycle road and the ratio of bicycle use. In addition this study confirmed that we have to focus on details such as road structure, boundary stone design and so on first. This study also suggested the problems and solutions of previous bicycle drive and users’ behaviors. Especially, Chang won which is a model of this study is designed by urban planning and has well organized bicycle road. Therefore this improvement ways will help new towns to connect specific bicycle infrastructure, various facility with bicycle policies.
안양1동사무소 및 주민자치센터 계획에 관한 연구-신도심과 구도심 연결방안과 복합 프로그램 제안을 중심으로-
유진상(Yu. jin sang),이학규(Yi. haak-yu),박진성(Park. jin sung) 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1
I'll present the alternative plans about a new program of buildings and the change of space shape attended on the problems occurred by the recent increase of population density and the extension of the cities by means of analyzing the situation of An-yang 1-dong. The problems are the connection between the new downtown and the old downtown, the complex of the neighborhood life facilities, the proper division as function of a residential district, the accommodation of the complex abilities fused Government buildings and residents' convenient facilities. If the government building has two kinds of energy about urban context an functional aspects, the building must absorb and integrate another infra to cope with the city's infra around us. This is able to carry out the function, that is, the building is open for the city and take the city into the inside city. In addition, as if it is the under space of symbolic tree of traditional construction, the town government building has the complex function so that the residents participate, communicate, take a rest, and accommodate the event of country.
1980년대 이후 우리나라에 등록 된 살균제와 살충제의 독성, 제형 및 계통별 현황
유진상(Jin-sang Yu),임태헌(Tae Heon Lim),이동운(DongWoon Lee) 한국농약과학회 2020 농약과학회지 Vol.24 No.1
Introduction of chemical pesticides has been in Korea since 1930s, but used as full-scale since 1970s. Therefore, this study was conducted to understand the changing process of the pesticide industry by comparing Koreas pesticide registration status from 1981 to 2018. Based on the common name, the number of registered pesticides have doubled in 1980s to 2010s. Among the registered pesticides in Korea since 1980s, low-toxic pesticides were accounted for 81.1% of total and and fish toxicity III grade were accounted for 64.8% of all the pesticides. There were only five types of pesticide formulations before 1980s. However, about 10 species grew by 10 years period, reaching 39 in 2010s. In 1980s and 1990s, ratio of wettable powder and emulsifiable concentrate was the highest, but since 2000, the ratio of suspension concentrate and granule formulation increased rapidly. The fungicides had a high ratio of wettable powder, suspension concentrate, and water dispersible granule formulation, and pesticides were emulsifiable concentrate, suspension concentrate, and wettable powder formulation, respectively. Registration status of fungicides by classification was increased from 27 classes before 1980s to 71 classes in 2010. The proportion of items in the top three classes averaged 29.3% by chronology. Insecticides had tripled from 13 classes before the 1980s to 40 classes in the 2010s. The ratio of the top three classes in insecticides was 10% higher than the fungicides. The results of this survey can be used as basic data to understand change in the agrochemical industries in Korea.
유진상(Yu Jin-Sang) 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2
The purpose of this study is to find concrete spacial concept which should be pursued in plazas of Korean cities, For this study, I planed a plaza in front of the Seoul city hall, giving emphasis on harmonizing the historical and cultural space, walking, traffic networks, and symbolic characters. As a result of analysing the situations around the city hall and the behaviors of people, I conclude that Korean urban plaza: 1. should avoid shape symbolizing but pursue to symbolize the very live of the citizens. 2. should have void space and flexibility to satisfy the highly concentrated functions, To achieve these objectives, plazas should be flat without any ruggedness. In addition to this, designers should furnish only spacial playing, colors, surfaces, rhythm, and basic facilities. Simultaneously, it require that various flexible boundaries; such as the invisible border lines in multi-purpose athletic fields.
최병철,유진상,서용석,정필수,Choi, Byugchul,Yu, Jin sang,Seo, Yong seok,Jung, Pilsoo 한국교통대학교 융복합기술연구소 2019 융ㆍ복합기술연구소 논문집 Vol.9 No.1
The aim of this study is to improve the durability performance of catalysts for a catalytic combustor and to obtain operating conditions for stable combustion of the catalytic combustor. It was attempted to improve the durability of the catalysts by adding a promoter in order to reduce the cost of replacing Pt catalyst while maintaining stability. The main catalyst used in the study was Pt and the promoters were Ni and La. Pure Pt3/γ-Al<sub>2</sub>O<sub>3</sub> catalyst without promoter was promoted to fast sintering states under harsh conditions and catalytic combustion was turned off, whereas the catalysts added La, Ni as promoter were showed relatively slow sintering states. It can be concluded that the promoter La, Ni effectively contributes to the improvement of the durability of the Pt catalyst, and it is possible to get longer durability and more stable duration than the conventional catalytic combustor.