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국내 농축산단지 내 지하수 수질특성 및 오염인자 상관관계 분석
윤종현,박선화,최효정,김덕현,김문수,윤성택,김영,김현구,Yoon, JongHyun,Park, Sunhwa,Choi, HyoJung,Kim, Deok Hyun,Kim, Moonsu,Yun, Seong-Taek,Kim, Young,Kim, Hyun-Koo 한국지하수토양환경학회 2020 지하수토양환경 Vol.25 No.4
In this study, the concentrations of some of the important ionic contaminants in groundwaters of national monitoring network in Korea were identified, and their correlation to nitrate concentration was investigated. Approximately 80% of the groundwater samples were found to be as Ca2+-(Cl-+NO3-) type groundwater with the concentration ranges [minimum to maximum values, median (mg/L)] of Ca2+[0.1~228.2, 19.7], Mg2+[0.1~53.2, 5.1], K+[0.1~50.8, 1.9], Na+[1.5~130.5, 18.1], NO3--N[0.1~73.4, 9.3], NH4+-N[0.0~53.9, 0.3], Cl-[3.1~482.6, 24.0], and SO42-[2.8~101.6, 7.0]. The prevalence of Ca2+-(Cl-+NO3-) type suggest that the composition of groundwaters were greatly influcenced by chemical fertilizers and animal manure, Correlation analyses indicated threre was positive correlation between NO3--N concentration and ionic species including Cl-, Ca2+, Mg2+, and Na+. In particular, the correlation was strongest for Cl- and NO3--N, suggesting that groundwaters largely impacted by agricultural and livestock breeding activities tend to contain high levels of Cl-.
윤종현(Jonghyun Yun),최연욱(Yeonwook Choi),기원용(Wonyong Ki),허승진(Seung-Jin Heo),이철홍(Chulhong Rhie) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
In this study establish, The FE model can reproduce the door sagging and providing analysis techniques that can predict the door sagging. In addition, the impact was analyzed door sagging cause. In addition Door sagging was selected the factors that cause. Also The Sagging of the vehicle body between bead and cross-sectional shape were analyzed. Shown below for details. The FE model build that Door sagging phenomenon can reproduce. Also there is always an issue about Door sagging problem. To find a main cause of door sagging we analyze 2kinds of sectional properties, and validate top 3 parts affect door sagging. As a result of research we can find how to reduce Door sagging with an engineering calculation base. Through the relationship analysis capable of reducing the Door sagging, will be able to determine the effective door sagging. Then Watch early in the design phase will be designed taking into account the Door sagging.
강영길(Younggil Kang),윤종현(JongHyun Yun),이수원(Soowon Lee),박인성(Insung Park) 한국정보과학회 2007 한국정보과학회 학술발표논문집 Vol.34 No.2D
사이버 침해란 정보시스템의 취약한 부분을 공격하여 시스템 내부에 침입하거나 시스템을 마비/파괴하는 등의 사고를 유발하는 모든 행위를 말한다. 이러한 사이버 침해의 피해를 줄이기 우해 국내외 많은 연구 기관과 업체에서는 침해탐지시스템과 같은 정보보호 기술을 연구 개발하여 상용화하고 있다. 그러나 기존의 정보보호 기술은 이미 발생한 침해를 탐지하여 피해의 확산을 막는 데만 한정적으로 사용되고, 침해의 발생 가능성을 예측하지는 못하기 때문에 점차 첨단화, 다양화되고 있는 사이버 침해에 대응하기 힘들다는 문제점을 갖는다. 본 논문에서는 보안 취약점을 이용한 사이버 침해를 대상으로 전문가 설문을 통해 사이버 침해의 발생 가능성을 예측하는 방법을 제안하고, 이를 위한 사이버 침해 예측 항목을 추출하였다. 예측 항목 추출은 3 단계로 구성되며, 첫 번째 단계에서는 기존 연구와 사례 분석을 통해 예측 항목의 계층 구조를 생성한다. 두 번째 단계에서는 첫 번째 단계를 통해 생성된 예측 항목들을 델파이 방법을 통해 개선하여 최적의 예측 항목을 결정한다. 마지막 단계에서는 각 항목들에 대한 쌍대 비교 설문을 진행하여 항목 간 가중치를 추출한다.
김국선(Kooksun Kim),김민지(Minji Kim),김중희(Joonghee Kim),송정효(Jeonghyo Song),신중배(Jungbae Shin),윤종현(Jonghyun Yun),최보아(Boah Choi) 한국가구학회 2015 한국가구학회지 Vol.26 No.1
There is an increasing trend each year in the number of subway users due to increase in the traffic volume. As the number of train service has risen, the subway drivers are given heavy work and from the same, are put at risk of mental health deterioration due to stress. As this is directly connected to safety, there is an urgent need for improvement of the situation. Therefore, as a way to appropriately relieve such stress, resting space where mental and physical energy can be recharged is necessary. Thus, this research conducted a survey of demand with subway drivers as subjects in order to provide resting space that can offer healthy rest and increase work effectiveness. 50 subway drivers were the subjects of this survey. As a result of analyzing the contents of the survey, environmental satisfaction was shown to be the lowest compared to psychological and morphological satisfaction. In the case of sleeping room, they wanted more comfortable and individual space. And the waiting room had the highest rate of usage frequency. The storage space was where the subway drivers showed the strongest attachment and was shown to be the only personal space. Most were shown to be satisfied with the outdoor space, but it had the lowest usage frequency. In addition, it is nessasery customized storage cabinet designed for subway drivers should be produced, which can effectively arrange the limited space. I hope that these direction of improvement can increase the healthy rest and work effectiveness of the locomotive engineers as it is directly being connected to the health and safety of the citizens.