환자-교차 대조군 연구를 적용한 산업재해 발생의 단기적 영향 요인

정선아,원종욱,노재훈,이종태,Jeong, Seon-A,Won, Jong-Uk,Roh, Jae-Hoon,Lee, Jong-Tae 대한예방의학회 2001 예방의학회지 Vol.34 No.1

Objectives : To elucidate the transient effects on the risk of occupational injuries as acute events and establish so alternative proposal. Methods : The study population comprised a total of 302 workers randomly selected from applications for occupational injury compensation reported to the Inchon local labor office from January 1. 1999 to December 31. A case-crossover design, where each case serves its own control, was applied to this study. Through a telephone interview, workers provided useful data concerning five job related stressful events such as company transfer, work load change, overtime work, exchange duty, and work-part transfer. They were asked whether there were stressful events within a week of the occurrence of injury and the degree of stress. Exposure status from one year prior was used as control information. In the end, the data provided by 158 of selected persons was used for the analysis based on the quality of the data provided by the participants. A conditional logistic regression was used to discover the transient effects on the risk of occupational injuries as acute events. Results : The effects a company transfer and work load change on occupational injury was statistically significant on the risk of occupational Injuries as an acute event(RR=5.5, 95% CI=2.501-12.428; RR=3.1, 95% CI=1.963-5.017, respectively). Other stressful events were found to elevate the risk factor for the occurrence of occupational jujury, but were not significant. Conclusions : Our results suggested that transient stressful events elevated the risk factor for the occurrence of occupational injury.

경인아라뱃길의물환경 관리방안

정선아,박천홍,정의택,고덕구,Jeong, Seon-A,Park, Cheon-Hong,Jeong, Ui-Taek,Go, Deok-Gu 한국수자원학회 2012 물과 미래(한국수자원학회지) Vol.45 No.12

기존 대구경 파이프라인과 신설터널간의 상호작용

정선아,최정인,홍은수,천윤철,이석원,Jeong, Sun-Ah,Choi, Jung-In,Hong, Eun-Soo,Chun, Youn-Chul,Lee, Seok-Won 한국터널지하공간학회 2009 한국터널지하공간학회논문집 Vol.11 No.2

도심지 등 지역적인 여전에 의하여 기존의 지하 공동 또는 터널에 근접하여 발파를 이용한 새로운 터널을 굴착할 경우, 새로운 터널의 굴착으로 인하여 지반이 이완되고 따라서 기존 지하 공동의 안정성에 문제가 발생할 수 있다. 이러한 가존 지하 공동의 안정성에 문제를 발생시킬 수 있는 가장 큰 요소로는 기존 지하 공동과 신설 터널의 이격거리가 될 수 또한 신설 터널 굴착으로 인한 소성영역의 발생에 따른 지반 이완을 문제 심을 수 있다. 따라서 본 연구에서는 기존 광역 상수관과 신설 터널의 이격거리에 따른 기존 광역 상수관의 안정성을 평가하기 위하여 이격거라가 다른 여섯 가지 모델에 대해 석고를 이용힌 2차원 축소 모형실험을 실시하였다. 실험 결과는 터널 굴착과정과 파괴 단계에서 발생된 변위 벡터와 균열양상으로 표현하였다. 터널 굴착과정 중 발생하는 변위를 분석하면, 터널과 광역 상수관의 간격이 상수관 직경의 2.5배 (2.5D)까지는 이격거리가 증가함에 따라 감소하는 경향을 보인다. 그러나 중심 간격이 2.5D를 넘으면 추가변위는 발생하지 않았다. When a new tunnel is excavated by the drill and blast method near pre-existing underground structures or tunnels due to the region restricted condition such as urban area, the ground will be relaxed by the excavation. In this case, issues can be created in terms of stability of pre-existing underground structures. One of major factors determining the stability of pre-existing underground structures can be a separation distance between pre-existing underground structures and a newly excavated tunnel. The region of ground relaxation defined by the plastic zone due to new excavation can be varied by separation distance. In this study, in other to estimate an influence of new tunnel excavation in terms of separation distance on the stability of pre-existing large pipelines, two-dimensional scaled model tests using plaster were performed for six models which have a different separation distance, The results show that based on the analysis of induced displacement during tunnel construction, the displacement decreases as the separation distance between large pipeline and new tunnel is increased until the distance is 2.5 times of pipeline diameter. Beyond this point, however, the displacement has become stabilized.

자두과원에서 성페로몬을 이용한 복숭아순나방, 복숭아순나방붙이, 복숭아심식나방의 발생 패턴

정선아,라릿,안정준,김영일,정철의,Jeong, Sun-A,Sah, Lalit Prasad,Ahn, Jeong Joon,Kim, Young-Il,Jung, Chuleui 한국응용곤충학회 2012 한국응용곤충학회지 Vol.51 No.4

경북의 자두 주요 생산지인 경산시와 의성군내 8개의 자두과원을 선정하여, 2010년과 2011년에 주요 심식나방류인 복숭아순나방, 복숭아순나방붙이, 복숭아심식나방의 발생상을 성페로몬 트랩을 이용하여 조사하였다. 또한 경산지역에서는 과수원 내부와 외부에서 포획된 개체수 자료를 이용하여 내외부 발생량을 비교하였다. 경산에서 복숭아순나방과 복숭아순나방붙이 발생은 의성보다 약 1주일 정도 빠르게 나타났다. 복숭아순나방은 3월 하순에 발생을 시작하여, 4월 하순 최성기를 이루었으며, 이후 세대는 6월 중순, 7월 중순, 8월 중순에 성충 최성기를 보였다. 반면 복숭아심식나방은 두 지역간의 차이가 없었으며, 6월 상순에 발생을 시작하여 9월 중순까지 2-3회의 발생 최성기를 보였다. 복숭아심식나방의 경우 2010년은 전형적인 2회 최성기를 보였으나 2011년에는 3회 최성기를 보였다. 연간 복숭아순나방, 복숭아순나방붙이, 복숭아심식나방의 발생량비는 경산지역에서 63-47:16-35:20-18%였고, 의성지역은 51-46:18-13:31-36%로 나타났다. 복숭아순나방과 복숭아순나방붙이의 경우 과수원 내부와 외부에서 포획량의 차이는 없었다. Fruit borers such as Grapholita molesta, G. dimorpha and Carposina sasakii are major pests of plum in Korea. Population densities and seasonal occurrence were monitored using the synthetic sex pheromone trap in Uiseong and Gyeongsan, two important major plum growing area in Korea. In 2010 and 2011, adults of G. molesta were caught from mid April with the peak of late April, and then undergone three more generations in Gyeongsan. Grapholita dimorpha appeared from late April and they showed three peaks until late September. Both Grapholita species occurred a few days later in Uiseong than in Gyeongsan where the latitude is $1^{\circ}$ lower. There was no difference of the phenological occurrence of C. sasakii between Gyeongsan and Uiseong, showing the same patterns of two or three peaks. Population size was in order of G. molesta, G. dimorpha and C. sasakii with 63:16:20 and 47:35:18 in Gyeongsan and 51:18:31 and 46:13:36 in Uiseong, in 2010 and 2011 respectively. There was no difference between the numbers of Grapholita species caught in the trap installed inside and outside of the orchards.

터널 굴착에 따른 기존 지하 공동의 안정성 영향

정선아(Jeong Sun Ah),김동현(Kim Dong Hyun),김선곤(Kim Sun Kon),최두진(Choi Doo Jin),이석원(Lee Seok Won) 대한토목학회 2008 대한토목학회 학술대회 Vol.2008 No.10

월동 머리뿔가위벌의 성충 우화에 미치는 온도와 습도의 영향

정선아(Sun-A Jeong),정철의(Chuleui Jung) 한국양봉학회 2011 韓國養蜂學會誌 Vol.26 No.4

3차원 모델을 이용한 용담호의 수리 및 수온분포 특성 분석

정선아 ( Seon A Jeong ),정남정 ( Nahm Chung Jung ) 한국물환경학회 2006 공동 추계학술발표회 Vol.2006 No.-

댐 재개발이 호수 수온 및 탁수 거동 변화에 미치는 영향 예측을 위한 모델 연구

정선아(Seon A Jeong),박석순(Seok Soon Park) 大韓環境工學會 2005 대한환경공학회지 Vol.27 No.8

한국 근대기 교표디자인의 기원 및 기능

정선아(Jeong Sun-a) 한국근현대미술사학회 2014 한국근현대미술사학 Vol.28 No.-

The purpose of this study is to observe the history of the symbolic representation of educational institution and how they were changed with time. School symbol represents educational philosophy of a school and distinguishes a school from another. More specifically, the symbols are the visual output of the attempting students’ sense of identity and belonging. To explore the origin of school symbols, changes in the formal quality of school symbols in modern Joseon is reviewed. And the study observes different cases of how these visual symbols were reproduced in the field of education as well as in the society after Korean liberation. Creation of school symbol was natural in the context of national modernization. The culture of ‘symbol’(for identity), not ‘patterns’(for decorating), began to formulate. And the change of clothes made easier accepting and naturalizing of ‘modern symbol’s’ form in the colonial daily life. School clothes were changed to uniform style around March First Movement in 1919. The school clothes of western uniform style matched badges- the modern thing- well. And, through becoming imperial subjects in the educational field of in the Japanese ruling period, school symbols functioned as a daily medium to utilize and control human resources efficiently. As Japan rushed into wartime system after Sino-Japanese War in 1937, school symbols were revised towards strengthening Japanese intentions. Nationalist educators and students found their own ways to fight back at the idea of Japanese Imperialism by adroitly reveling national or imperial symbols of Daehan empire that had existed before on the school emblems. That is, school symbols were a thing with which governing group and governed group conflicted with each other under special background of colony. However, in a country without any distinctive visual system, school symbols may have had a significant meaning, yet its form have adopted Japanese traditional motives or motives that were used in the militarism. The change of Songdo school’s emblem shows that the motif with patriotic meaning hid behind the similar form of colonial ruling country’s symbol, in the situation of the modern visual system were not established yet. As school symbols are created and perceived s a part of a students’ life, these formal qualities became the prominent style of Korean’s school symbols. Even after the liberation of Korea, Japanese style visual form could be observed throughout the symbols of schools, local government, and corporates. School symbol showed continuation of familiar design formality rather than disclosing educational philosophy of a school.

PFC를 이용한 입자 파쇄 모델의 적용성 연구

정선아(Jeong Sun-Ah),김은경(Kim Eun-Kyung),이석원(Lee Seok-Won) 한국토목섬유학회 2010 한국지반신소재학회 논문집 Vol.9 No.1

기초 지반이나 댐, 사면 등을 건설할 경우, 성토재로 입자 크기가 큰 조립 재료를 많이 사용하고 있다. 따라서 이러한 조립재료의 전단 거동은 구조물의 안정성에 영향을 미치게 된다. 예를 들어, 구조물과 입자의 접촉면 혹은 입자들간의 접촉면에서 발생하는 입자 파쇄는 전체 지반의 특성을 변화시키고 따라서 구조물의 안정성에 문제를 유발할 수 있다. 본 연구에서는 입자의 파쇄 유무에 따른 전단 거동의 특성을 파악하기 위해 개별요소법(DEM, Distinct Element Model)을 기반으로 하는 수치해석 프로그램 PFC2D를 이용하여 직접전단실험을 재현하였다. 입자의 모델을 파쇄 모델과 비 파쇄 모델로 구분하여 총 4개의 모델을 모사하고 그 결과를 분석하였다. 비 파쇄 모델에는 one ball 모델과 clump 모델이, 파쇄 모델에는 cluster 모델과 Lobo-crushing 모델을 적용하였다. 입자의 구성은 Lobo-Guerrero and Vallejo(2005)가 제안한 8개 입자의 조합으로 구성하였다. 해석 결과, 내부마찰각 순서는 clump 모델 > cluster 모델 > one ball 모델 순이며, 전체를 비교해 봤을 때 원형 입자모델보다 입자 결합모델이, 파쇄 모델보다 비 파쇄 모델의 내부마찰각이 크게 나타났다. 또한 기존에 제시된 Lobo-Guerrero and Vallejo(2005)의 모델은 입자 파쇄 거동을 모사하기에는 부적합하다는 결론을 얻을 수 있었다. Granular soils having a large particle size have been used as a filling material in the construction of foundation, harbor, dam, and so on. Consequently, the shear behavior of this granular soil plays a key role in respect of stability of structures. For example, soil particle crushing occurring at the interface between structure and soil and/or within soil mass can cause a disturbance of ground characteristics and consequently induce issues in respect of stability of structures. In order to investigate the shear behavior according to an existence and nonexistence of particle crushing, numerical analyses were conducted by using the DEM (Discrete Element Method)-based software program PFC2D (Particle Flow Code). By dividing soil particle bonding model into crushing model and noncrushing model, total four particle bonding models were simulated and their results were compared. Noncrushing model included one ball model and clump model, and crushing model included cluster model and Lobo-crushing model. The combinations of soil particle followed the research results of Lobo-Guerrero and Vallejo (2005) which were composed of eight circles. The results showed that the friction angle was in order of clump model > cluster model > one ball model. The particle bonding model compared to one ball model and noncrushing model compared to crushing model showed higher shear strength. It was also concluded that the model suggested by Lobo-Guerrero and Vallejo (2005) is not appropriate to simulate the soil particle crushing.