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 Journal of Preventive Medicine and Public Health 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.

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.

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 韓國鋼構造學會 論文集 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.

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.

즐례 : 전신경화증 환자에서 발생한 동기능부전증후군 1예

김동현 ( Dong Hyun Kim ),김성중 ( Sung Jung Kim ),소중해 ( Jung Hae So ),임균섭 ( Gyun Seop Lim ),김형호 ( Hyung Ho Kim ),김현숙 ( Hyun-sook Kim ),김윤성 ( Yun Sung Kim ) 대한내과학회 2014 대한내과학회지 Vol.86 No.1

전신경화증은 심장 조직에도 침범할 수 있으며 그 결과 심낭삼출, 심근허혈(myocardial ischemia), 심근비대(myocardial hypertrophy), 심부전(heart failure), 판막부전(valvular impairment), 부정맥 및 전도장애 등을 일으킬 수 있다. 그 중에서 도 부정맥과 전도장애는 매우 드물며 예후가 좋지 않은 것으로 추정된다. 본 환자의 증례에서와 같이 전신경화증과 동반된 동기능부전증후군은 문헌고찰 결과 유일하게 국외에 1증례[4]가 있을 뿐이었으며 아직까지 국내 보고는 없었다. 이에 저자들은 제한형 경피증에 동반된 동기능부전증후군 환자에서 아미노필린(aminophylline)과 테오필린(theophylline) 투여로 정상동리듬을 회복한 성공적인 치료를 경험하였기에 문헌고찰과 함께 보고하는 바이다. Systemic sclerosis (SSc) is characterized by the presence of microvascular disease and various patterns of cutaneous and parenchymal fibrosis. Manifestation of SSc may occur in numerous tissues and organs and can be particularly problematic when present in the lungs, kidneys or heart. Cardiac involvement in SSc includes pericarditis, myocardial disease, conduction abnormalities, and arrhythmia. Sick sinus syndrome is described as a combination of symptoms (dizziness, confusion, fatigue, syncope and congestive heart failure) caused by sinus node dysfunction and manifested by marked sinus bradycardia, sinoatrial block, or sinus arrest. Sinus node dysfunction is most often seen in the elderly but also, rarely, in systemic amyloidosis and connective tissue disease. Sick sinus syndrome is rarely found in patients with SSc, of which there has been only one case report, according to a review of the literature. Therefore, we report a case of sick sinus syndrome in a 71-year-old female with SSc. (Korean J Med 2014;86:110-115)

스마트폰 촬영 이미지를 활용한 나이테 검출 및 분석 프로그램 개발

김동현 ( Dong-hyeon Kim ),김태이 ( Tae-lee Kim ),조형주 ( Hyung-joo Cho ),김동근 ( Dong-geun Kim ) 한국산림과학회(구 한국임학회) 2020 한국산림과학회지 Vol.109 No.4

본 연구는 고가의 나이테 분석 장비에서 탈피하고 손쉽게 나이테 분석작업을 수행하기 위해 스마트폰 촬영 이미지를 활용할 수 있는 컴퓨터 프로그램인 TRIO(Tree Ring Information)를 개발하였다. TRIO는 반 자동형 컴퓨터 프로그램이며, 스마트폰 촬영 이미지를 활용해 1년 단위별 나이테 반경을 측정하고, 결과를 엑셀로 저장한다. 카메라 성능에 따른 결과를 비교하기 위해 삼성 갤럭시 S10과 삼성 갤럭시 탭 S2로 기종을 달리하여 30개의 리기다소나무 원판의 4방위 이미지를 취득하고 WinDENDRO^TM와 1년 단위별 나이테 반경을 측정한 결과를 비교하였다. 연구 결과, 삼성 갤럭시 S10과 S2 모두 WinDENDRO^TM와 유의한 결과를 나타내었고, S10의 R2 값이 0.976으로 높은 상관관계를 가졌으며, RMSE는 0.4199로 분석되어 매우 유사한 결과를 출력하였다. S2의 R² 값은 0.975, RMSE은 0.4232로 S10과 큰 차이가 나타나지 않았다. 이에 따라 본 연구에서 개발한 TRIO는 WinDENDRO^TM와 매우 유사한 1년 단위별 반경 값을 분석하였다. In this study, to solve the existing inefficient stem analysis process and expensive equipment cost problems, a method for detecting and analyzing tree rings using smartphone images was proposed and a semi-automated computer program (TRIO, Tree Ring Information) was developed. TRIO can measure the annual ring radius and save the results to Excel. Since TRIO uses smartphone images, the results may vary depending on the quality of the smartphone camera. Therefore, using the Samsung Galaxy S10 and Tap 2, 30 dics images of Pinus rigida were acquired and analyzed, and these were compared with WinDENDRO^TM. As a result of the study, both Samsung Galaxy S10 and S2 showed significant results with WinDENDRO^TM, and the R2 value of S10 had a high correlation as 0.976, and RMSE was analyzed as 0.4199, and very similar results were output. The R² value of S2 was 0.975 and the RMSE was 0.4232, showing no significant difference from S10. Accordingly, the TRIO developed in this study analyzed the annual radius value very similar to WinDENDRO^TM.

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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국가공역에서의 유·무인기 혼합운용을 위한 시뮬레이션엔진 개발 및 검증

김동현(Dong-Hyun Kim),김준형(Jun-Hyung Kim),윤석준(Sug-Joon Yoon) 한국항공우주학회 2016 韓國航空宇宙學會誌 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.