간 질환력과 원발성 간암에 관한 환자-대조군 연구

김동현,박병주,유근영,안윤옥,이효석,김정룡,이상일,이무송,안형식,김헌,박태수,Kim, Dong-Hyun,Park, Byung-Joo,Yoo, Keun-Young,Ahn, Yoon-Ok,Lee, Hyo-Suk,Kim, Chung-Yong,Lee, Sang-Il,Lee, Moo-Song,Ahn, Hyung-Sik,Kim, Heon,Park, Tae-Soo 대한예방의학회 1994 예방의학회지 Vol.27 No.2

The relationship between past liver disease history and the risk of primary liver cancer was analyzed in a hospital-based case-control study conducted in Seoul on 165 patients with histologically or serologically confirmed hepatocellular carcinoma and individually age- and sex-matched 165 controls in hospital for ophthalmologic, otologic, or nasopharyngeal problems. Significant association were observed for liver deseases occurring 5 or more years before liver cancer diagnosis [OR,4.9;95% confidence interval (CI), $1.6{\sim}14.0$) and family history of liver disease(OR, 9.0;95% CI, $2.1{\sim}38.8$). These associations were not appreciably modified by allowance for major identified potential confounding factors. From these results, it is possible to speculate that liver cell injuries caused by various factors might be a common pathway to developing primary liver carcinoma. Considering the significant effect of family history of liver diseases on PLCA risk after adjusting past liver disease history, there might be genetic susceptibility in the carcinogenic mechanism of liver cancer. Further investigations are needed to clarify the effect of family history of liver disease on PLCA risk.

기업조직 내 소셜 미디어 서비스 활용의 가치 제고 및 활성화 방안

김동현,서현식,김형준,이봉규,Kim, Dong-Hyun,Seo, Hyun-Shik,Kim, Hyung-Joon,Lee, Bong-Gyou 한국정보처리학회 2011 정보처리학회논문지D Vol.18 No.4

본 연구의 목적은 조직 내 소셜 미디어를 활용하여 기업의 성과에 도움이 되는 방안을 찾고자 함에 있다. 최근 들어 기업들도 소셜 미디어를 다양한 분야에 활용하는 방안을 모색하고 있음에도 이에 대한 연구는 극히 미흡한 실정이다. 이에 본 연구는 소셜 미디어 서비스 사용자 간의 커뮤니케이션이 증가하게 되면 다양한 인간관계 형성 및 확장이 발생되고, 이것은 다시 정보공유, 자아추구, 사회참여, 유희(오락) 등의 성과로 이어지는 연구모형을 설정하였다. 연구의 효과를 극대화하기위해 연구대상을 소셜 미디어 서비스를 이용하는 직장인과 비직장인들로 분류하여 조사 및 분석하였다. 연구 결과, 직장인들은 모르는 사람들과 지식을 공유한 후, 습득된 지식을 바탕으로 자신의 이미지를 지인들에게 어필하는 것으로 나타났다. 또한, 소셜 미디어 기능에 유희(오락)성을 포함시키면 조직 내 소셜 미디어의 사용이 활성화되어 경영참여로 이어질 수 있는 것으로 분석되었다. 본 연구는 향후 조직 내 소셜 미디어 서비스를 활용할 경우 유용한 가이드라인으로 사용될 수 있을 것이다. The purpose of this study is to find the beneficial plan for business success by the advantage of social media service in the business organization. There is few research for applying social media on a variety of fields in business organization although many companies are trying to find the way for its application. Hence, this study identifies the possibility for the utilization of social media services, and it also finds the plan for their effective application. The social relationship is created by increasing communications between users of social media service. The research model is established on the basis of the hypothesis that the social relationship affects knowledge share, pursuit of ego, social participation, amusement. To maximize the impact of results, the research was conducted on the basis of the target on two groups including the business men and non-business men who use social media services. As results of the research, the business men tend to appeal their impression based on sharing knowledge with anonymous people. Also, it is necessary to make a social participation to a management participation, and to utilize the social media in the organization by including amusement to its function. This research is expected to have significant implication to companies which wants to apply social media services in the future.

헤어핀 보강 선설치앵커의 정적 및 지진모의실험에 의한 전단 저항강도 평가

김동현,박용명,김태형,조성훈,강충현,Kim, Dong Hyun,Park, Yong Myung,Kim, Tae Hyung,Jo, Sung Hoon,Kang, Choong Hyun 한국강구조학회 2015 한국강구조학회 논문집 Vol.27 No.3

본 연구에서는 비균열 및 균열콘크리트에 설치된 헤어핀 보강 선설치앵커의 정적 및 동적 저항강도 평가를 위한 연구를 수행하였다. 이를 위해 앵커 직경 30mm, 연단거리 150mm, 매입깊이 240mm에 D10 헤어핀 철근으로 보강한 시험체를 제작하였으며, 균열시험체는 전단하중에 직각방향과 평행방향 균열을 각각 고려하였다. 동적 강도 평가는 지진모의실험에 의하였으며 가력방법은 ACI 355.2의 기준을 적용하였다. 헤어핀 보강 앵커의 저항강도는 콘크리트 균열과는 상관성이 없었으며 동적 강도는 정적 강도와 동등한 수준을 보였다. 마지막으로 헤어핀 보강 앵커의 설계 강도에 대한 고찰을 제시하였다. This study evaluated the static and dynamic shear strength of cast-in-place anchors reinforced with hairpin bars in uncracked and cracked concrete. The anchors 30mm in diameter reinforced with D10 hairpin bar were designed with an edge distance of 150mm and an embedment depth of 240mm. The cracked specimens consisted of the orthogonal and parallel cracks to the direction of shear loads, respectively. The dynamic strength was evaluated using seismic qualification tests based on the ACI 355.2 standard. The shear strength of the hairpin reinforced anchor was hardly correlated to the concrete cracks and the dynamic strength was similar to its static shear strength. Finally, a consideration on the design strength of hairpin reinforced anchors was presented.

댐 시설물 보수·보강공법 선정을 위한 우선순위지수에 대한 고찰

김동현,박형준,윤희정,이승오,Dong Hyun Kim,Hyung Jun Park,Hee Jung Youn,Seung Oh Lee 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 논문집 Vol.27 No.3

After the collapse of the Seongsu Bridge in the 1990s in Korea, attention was focused on the maintenance of facilities. The government has established various policies since the enactment of the Act in 1995 until recently. In general, safety inspections are performed to evaluate the safety grade of facilities, and facilities are maintained and managed by performing repairs and reinforcements for defects. However, since the budget is limited, it is impossible to carry out repair and reinforcement projects for all defects. It is necessary to prioritize repair and reinforcement measures. Then, the priority index (PI) is presented considering the importance of members, the seriousness of defects, and economic feasibility. In this index, the degree of influence can be adjusted within the range of 50 to 100% according to the expert's subjective judgment, and the same weight is set for some specific members. Also, the effect through repair and reinforcement is not taken into account decisively, and most of them have a limit in which priority is determined by economic feasibility. Therefore, in this study, through several case studies, problems with the priority index were reviewed and an equation was presented to improve them.

국가공역에서의 유·무인기 혼합운용을 위한 시뮬레이션엔진 개발 및 검증

김동현(Dong-Hyun Kim),김준형(Jun-Hyung Kim),윤석준(Sug-Joon Yoon) 한국항공우주학회 2016 한국항공우주학회지 Vol.44 No.5

최근 국가공역 내 유·무인항공기 혼합운용 시 충돌 감지 및 회피, 통신두절 등의 다양한 문제가 예상된다. 따라서 본 연구에서는 EUROCONTROL의 BADA와 NASA의 성능 데이터를 기반으로 유인기와 무인기 혼합운용 및 ATC/ATM 시뮬레이션을 동시에 수행할 수 있도록 필요한 환경 구축과 동적 모델링을 수행하였다. 또한 구성한 모델의 검증을 위하여 6-DOF 비행모델과 세그먼트별 동일한 입력값으로 시뮬레이션을 수행하고, RMSE결과 비교를 통해 구성한 모델의 적합함을 확인하였다. Recently, manned and unmanned aerial vehicles are faced with problems such as collision detection and avoidance, link-loss for integrated operations in NAS. Hence, on the basis of the performance data of EUROCONTROL’s BADA and NASA, an environment was developed to simultaneously handle simulations of integrated operations of MAVs and UAVs along with ATC/ATM simulations, and dynamic modeling was then carried out. To validate the developed model, simulations were performed on a 6-DOF model by its segments and the results were compared to the RMSE results.

기후변화를 고려한 낙엽송 지위지수 추정

김동현 ( Dong Hyeon Kim ),김의경 ( Eui Gyeong Kim ),박상병 ( Snag Byeong Park ),김현근 ( Hyeon Geun Kim ),김형호 ( Hyung Ho Kim ) 한국산림과학회 2012 한국산림과학회지 Vol.101 No.1

This study developed a growth model for Larix leptolepis based on the WLS model to examine the effects of climate change on them. The site index was chosen as the dependent variable and location, weather, and edaphic factor were chosen as independent variables. Simulations were performed under three A1B climate change scenarios with the temperature ranging from -3.3oC to +3.3oC. The simulation results showed that the site index decreased with peak at -0.8oC. The decrease level of the site index by region was also analyzed. Each scenario, site index has decreased mostly but some region was increased. When the temperature increased up to 3oC, site index was decreased to everywhere.

초등학생의 진로포부와 진로성숙도 간의 관계

김동현(Dong-Hyun Kim),김형균(Hyung-Gyun Kim) 공주교육대학교 초등교육연구원 2022 敎育論叢 Vol.59 No.3

본 연구의 목적은 학년 및 성별에 따른 초등학교 고학년 학생의 진로포부와 진로성숙도를 분석하고 두 변인 간의 관계를 규명하는 데 있었다. 본 연구는 전국 17개 시·도 지역 중 충청권의 3개 지역(대전, 세종, 충남)의 초등학교 5∼6학년 학생 306명을 임의로 표집하였고, 진로포부 검사와 진로성숙도 검사를 학년 및 학생 특성에 맞게 수정·보완하여 이용하였으며, 지도교수와 경력교사들의 검토 등을 거쳐 검사 도구의 타당도와 신뢰도를 확보하였다. 통계 자료는 2020년 12월 1일부터 12월 11일까지 온라인 및 직접 배부를 통해 수집하였으며, 총 310부의 설문지를 배부하고 전량 회수하였다. 활용 불가능한 설문지를 제외하고 최종적으로 306부의 설문지를 연구에 활용하였다(유효율 98.7%). 본 연구에 활용된 설문지는 SPSS 21 프로그램으로 통계처리 하였으며, 유의수준 p<.05에서 t-test, F-test, 피어슨의 상관관계 분석 등을 실시하였다. 본 연구의 주요 결과는 다음과 같다. 첫째, 성별에 따른 초등학교 고학년 학생들의 진로포부는 유의미한 차이를 나타내지 않았다. 둘째, 성별에 따른 초등학교 고학년 학생들의 진로성숙도는 유의미한 차이를 나타내지 않았다. 셋째, 학년에 따른 초등학생의 진로포부와 그 하위요인들은 유의미한 차이를 나타냈으며, 6학년 학생들이 5학년 학생들에 비해 높은 것으로 나타났다. 넷째, 학년에 따른 초등학생의 진로성숙도와 그 하위요인들은 의미 있는 차이를 나타내지 않았다. 다섯째, 진로포부와 그 하위요소의 수준이 높은 집단이 진로성숙도도 높은 것으로 분석되었다. 여섯째, 초등학생의 진로포부와 진로성숙도는 유의미한 정적 상관이 있는 것으로 나타났다. 본 연구의 결과를 바탕으로 초등학생의 진로성숙도를 높이는 방법으로는 진로교육에서 초등학생들의 진로포부 수준을 높여 줄 수 있는 프로그램을 운영할 필요가 있다. 더불어 현재 초등학생들의 진로포부 및 진로성숙도와 관련한 학습 및 체험 프로그램이 미비하므로 이와 관련된 후속 연구가 요구된다. The purposes of this study were to analyze career aspirations and career maturity of senior elementary school students by grade and gender and to identify the relationship between the two. Among the 17 cities and provinces nationwide 306 elementary school students in 3 regions (Daejeon, Sejong, and Chungnam) were randomly selected and career aspirations and career maturity tests were modified and supplemented according to grade and student characteristics. Statistics were collected online and directly from 1 to 11 December 2020, and a total of 310 questionnaires were distributed and collected. Except for unavailable questionnaires 306 questionnaires were finally used for the effectiveness 98.7% efficiency The questionnaires utilized in this study were statistically processed by the SPSS 21 program with significance levels p<.05 The correlation analysis of t-test, F-test and Pearson’s correlation analysis were conducted in p<.05 The main results of this study are as follows. First, career aspirations of senior elementary school students by gender did not show significant differences. Second, senior elementary school students' career maturity by gender did not show significant differences. Third, career aspirations of elementary school students and their sub-factors showed significant differences with sixth-grade students higher than fifth-grade students. Fourth, the career maturity of elementary school students and their sub-factors did not show significant differences. Fifth, it was analyzed that groups with high levels of career aspirations and their sub-factors also have high career maturity. Sixth, career aspirations and career maturity of elementary school students have a significant static relationship. Based on the results of this study, it is necessary to run a program that can raise the level of career aspirations of elementary school students in career education as a way to improve career maturity of elementary school students. In addition, since there are currently insufficient learning and experience programs related to career aspirations and career maturity of elementary school students follow-up research is required.

장내세균황산전이효소에 의한 파라벤의 황산화

김동현(Dong Hyun Kim),김병택(Byung Taek Kim),이남수(Nam Soo Lee),김형수(Hyung Soo Kim) 경희대학교 동서약학연구소 1994 경희동서약학연구소보 Vol.11 No.-

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실험 화재시 유독가스 방출과 Rats를 이용한 독성평가

김동현(Kim, Dong-Hyun),김홍(Kim, Hong),오규형(Oh, Kyu-hyung) 한국화재소방학회 2001 한국화재소방학회 학술대회 논문집 Vol.2001 No.추계

수요반응 프로그램을 고려시 전력판매사업자의 이익을 최대화하는 최적 인센티브 및 부하 감축량 결정

김동현(Dong-Hyun Kim),곽형근(Hyung-Geun Kwag),김진오(Jin-O Kim) 대한전기학회 2010 전기학회논문지 Vol.59 No.2

A system called demand response programs (DRP) is being introduced among various countries owing to the lack of new generation capacity and the higher fuel generation cost. It is a program which provides for the end-users to select their consumption of electricity by recognizing the value of their consumption in real time. That is, Demand Response can be defined as the changes in electric usage by end-use customers from their normal consumption patterns in response to changes in the price of electricity or other signals. It is expected that the effects of DRP are preventing price spike, improving supply reliability and social welfare and increasing option of customers. Considering the customer’s thermal comfort zone, this paper determines the most profitable combination of optimal incentives and amounts of load reduction for a retailer to maximize profits according to predicted outdoor temperatures while implementing DRP.