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무기력계수에 의한 고장력강 및 아연도금강판의 2겹 점용접 피로해석
김규상(Kyoosang Kim),나석찬(Sukchan Na),송준혁(Joonhyuk Song),강희용(Heeyong Kang),유효선(Hyosun Yu),양성모(Sungmo Yang) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
New steel sheet studies were performed by satisfying environmental standard and customer aspiration recently. So galvanized steel and high strength steel ware developed and extensively used in vehicle body, but this caused difficulties to satisfy design standards of spot welded joint. The reasonable fatigue strength analysis of spot welded joints was very important to estimate the reliability and durability of a vehicle. In this paper, Material S-N curves of galvanized steel sheet EZNCEN and high strength steel sheet HS40R ware obtained with lethargy from quasi static tensile-shear test. Fatigue life of 2-lap spot welded joint ware analyses by the MSC/FATIGUE using the finite element method. Than Fatigue life are presented for EZNCEN and HS40R spot welded joint with Dissimilar Material and welding current.
김규상(Kyoosang Kim),나석찬(Sukchan Na),송준혁(Joonhyuk Song),강희용(Heeyong Kang),유효선(Hyosun Yu),양성모(Sungmo Yang) 한국자동차공학회 2004 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
High strength steel was used vehicle body by satisfying environmental regulation and improving fuel ratio. Vehicle body sheets became thin, strong and functional, but it was insufficient to demand design standards of spot weldment in cold rolled steel and high strength steel. This paper presented a method for determining the fatigue life of cold rolled steel sheet EZNCEN and high strength steel sheet HS40R spot weldment used vehicle. We can be gotten the fatigue life of the spot weldments from the MSC/FATIGUE using the finite element method.
김규상(KyooSang Kim),박현경(Hyunkyung Park),최길용(Gilyoung Choi),임완령(Wanryong Lim),신규진(Kyoojin Shin) 한국환경보건학회 2017 한국환경보건학회지 Vol.43 No.3
Objectives: Excluding in their homes, children spend most of their time at an elementary school, daycare center, and/or kindergarten. For educational or recreational purposes, they make use of many children’s goods at these places. Some children’s goods contain phthalates and heavy metals with polyvinyl chloride (PVC), so due to their physiological and behavioral characteristics children are exposed to high concentrations of phthalates and heavy metals. This study aims to measure PVC and heavy metals, which are harmful substances in children’s goods which can have an effect on children’s health. Methods: Six samples of children’s goods were selected through cases of detected harmful substances and the results of previous research, including assembly blocks, model toys, household toys, bags, indoor play equipment, and floor mats. The selected items were measured using X-Ray Fluorescence (XRF), and the presence and content of environmentally harmful substances such as PVC or heavy metals in the materials of children s goods were examined. Results: The highest detection rate for PVC was observed in floor mats, and bags and indoor play equipment were higher than other goods in this regard. The highest detection rate for heavy metals was found in bags, followed by indoor play equipment, assembly blocks, household toys, model toys and floor mats. Except for bags containing heavy metals, five goods showed the highest level of Pb compared to other heavy metals. Floor mats contained the highest level of Pb, Cr, and Cu among all goods. Conclusion: Many children’s goods contain PVC and heavy metals, and high levels of heavy metals have been detected in some goods. It is necessary to manage children’s goods to support their health.
한국 성인의 3차 흡연으로 인한 아이의 건강 유해성 인식과 관련 요인
김정훈(Jeonghoon Kim),윤진하(Jin-Ha Yoon),김지현(Jihyun Kim),이완형(Wanhyung Lee),김영광(Yeong-Kwang Kim),이승현(Seunghyun Lee),김규상(KyooSang Kim) 한국환경보건학회 2018 한국환경보건학회지 Vol.44 No.1
Objectives: Thirdhand smoke (THS) refers to residual tobacco smoke pollutants that remain after cigarette smoking. The purpose of this study was to determine predictors of the belief among adults in Korea that THS is harmful to children. Methods: A population-based sample of 3,000 adults (≥19 years) among a web-based panel in Korea was obtained in November 2016. The respondents filled out questionnaires, including THS beliefs, smoking status, presence of voluntary smoke-free rules at home, and support for the implementation of smoke-free regulations at home. THS beliefs were assessed with a statement that staying in a room today where people smoked yesterday can harm the health of children. Results: Overall, 92.2 % of adults believed that THS exposure could harm the health of children. Respondents who were nonsmokers, believed that SHS exposure were associated with pneumonia of children, lived in home with complete smoke-free rule at home, and supported the implementation of smoke-free regulation at home were more likely to believe that THS could harm for health of children. Conclusions: The majority of Korean adults believed that THS exposure could harm the health of children. Predictors identified in the study can be useful to address the risk of THS beliefs and promote implementation of tobacco control policies.
Predicted Mean Vote(PMV)를 이용한 겨울철 종합병원의 실내 온·열 환경의 평가
이보람,김정훈,김규상,김혜진,이기영,Lee, Boram,Kim, Jeonghoon,Kim, KyooSang,Kim, Hyejin,Lee, Kiyoung 한국환경보건학회 2015 한국환경보건학회지 Vol.41 No.6
Objectives: A hospital is a complex building that serves many different purposes. It has a major impact on patient's well-being as well as on the work efficiency of the hospital staff. Thermal comfort is one of the major factors in indoor comfort. The purpose of this study was to determine thermal comfort in various locations in a hospital. Methods: Various indoor environmental conditions in a general hospital were measured in February 2014. The predicted mean vote (PMV) and carbon dioxide ($CO_2$) concentration were measured simultaneously in the lobby, office, restaurant, and ward. Results: The ward was the most thermally comfortable location (PMV=0.44) and the lobby was the most uncomfortable (PMV = -1.39). However, the $CO_2$ concentration was the highest in the ward (896 ppm) and the lowest in the lobby (572 ppm). The average PMV value was the most comfortable in the ward and the lowest in the lobby. In contrast, for concentration of carbon dioxide, the highest average was in the ward and the lowest in the lobby. Due to air conditioner operation, during operating hours the PMV showed values close to 0 compared to the non-operating time. Correlation between PMV and $CO_2$ differed by location. Conclusion: The PMV and concentration of carbon dioxide of the hospital lobby, office, restaurant and ward varied. The relationship between PMV and carbon dioxide differed by location. Consideration of how to apply PMV and carbon dioxide is needed when evaluating indoor comfort.
서울시내 공동주택 거주자의 주거환경 내 금연정책 시행에 대한 지지와 영향요인
김정훈(Jeonghoon Kim),이기영(Kiyoung Lee),김규상(KyooSang Kim) 한국환경보건학회 2017 한국환경보건학회지 Vol.43 No.2
Objectives: Although the Korean government is able to implement smoke-free regulations for shared areas in multi-unit housing (MUH), such regulations are limited for private homes. The purpose of this study was to determine the prevalence and predictors of support for the implementation of smoke-free regulations for homes and near the outsides of building among residents in MUH. Methods: A population-based sample of 2,600 residents among a web-based panel in Seoul was included. The residents completed questionnaires including smoking status, voluntary smoke-free home rules, and support for the implementation of smoke-free regulations for homes and near the outsides of building. The presence of a voluntary smoke-free home rule was determined when residents declared that no one smoked inside their homes. Results: Among the 2,600 MUH residents, prevalence of support for the implementation of smoke-free regulations for homes was higher (83.2%) than for near the outsides of buildings (75.1%). Support for the implementation of smoke-free regulations for homes was higher when residents were non-smokers, had voluntary smoke-free home rules, lived with children, lived with more residents, lived in owned homes, lived in apartments, and lived in homes with more frequent secondhand smoke (SHS) incursion. Support for the implementation of smoke-free regulations near the outsides of buildings was higher when residents were women, non-smokers, more educated, had a voluntary smoke-free home rule, lived with children, lived in homes with more frequent SHS incursion, and lived in a commercial area. Conclusions: The majority was supportive of the implementation of smoke-free regulations for homes. Predictors identified in the study can be useful for promoting implementation of smoke-free regulations for homes in MUH.
김채봉(Chae-Bong Kim),김규상(KyooSang Kim) 한국콘텐츠학회 2017 한국콘텐츠학회논문지 Vol.17 No.1
아토피 피부염은 학령기 전과 후 아동에서 유병률이 높은 것으로 알려져 있다. 또한 일반인뿐만 아니라 아토피 피부염 환자에서도 보완대체요법의 이용률이 증가하고 있다. 본 연구는 아토피 피부염 아동의 보완대체요법에 대한 이용 실태를 파악하고 이에 대한 기초 근거를 마련하는데 있다. 연구 대상은 2010년 ‘서울시 아토피 · 천식 안심학교’ 사업에 참여한 아동으로 6,800명의 아토피 피부염 아동 중에서 무응답을 제외하고 4,985명을 최종분석에 활용하였다. 독립변인은 연령, 가구 월 소득, 수면장애이었고 종속변인은 지난 12개월 동안의 병원 이용 경험, 한의원 이용 경험, 민간요법 이용 경험이었다. 연구결과, 병의원 치료 이용은 76.5%, 한의원(한방병원) 이용은 24.6%, 민간요법 이용은 62.3%, 한의원(한방병원)과 민간요법의 중복이용은 2.1%, 병의원 치료와 민간요법의 중복 이용은 34.2%, 병의원 치료와 한의원(한방병원), 민간요법의 중복 이용은 18.8%이었다. 그리고 보완대체요법 이용에 영향을 미치는 변인으로는 연령, 가구 월 소득, 수면장애인 것으로 나타났다. 그러나 일부 보호자들은 오랜 통념으로 민간요법이 더 효과적이고 안전하다고 인식하는 경향이 있다. 따라서 보완대체요법에 대한 장단점을 의료진과 상담한 후 이용하는 것이 바람직하다. Atopic dermatitis (AD) is prevalent in preschoolers and schoolchildren. The utilization of complementary and alternative medicine (CAM) is increasing in patients with AD as well as the general population. This study is based on the utilization of CAM for children with AD. Subjects were children suffering from AD who participated in the project of ’Seoul Atopy Asthma Free School’. In 6,800, the number of subject available data to final analysis was 4,985 for children with AD. Independent variables were age, monthly income of households, sleep disturbance, and dependent variables were medical treatment (MT), oriental medicine clinic (OMC), home remedy (HR) use experience during the past 12 months. As a result, MT was 76.5%, OMC was 24.6%, and HR was 62.3%, while multiple treatment from OMC and HR was 34.2%, and MT with OMC and HR was 18.8%. And variables influenced on CAM were age, monthly income of households, and sleep disturbance. However, some parents, tended to recognize that home remedy was effective and safe than other treatments. Therefore, it is recommended to counsel with physician about the merits and demerits of CAM.