InGaN UV bare칩을 이용한 $CaAl_{12}O_{19}:Mn^{4+}$ 형광체의 적색 발광다이오드 제조

강현구,박정규,김창해,최승철,Kang, Hyun-Goo,Park, Joung-Kyu,Kim, Chang-Hae,Choi, Seung-Chul 한국마이크로전자및패키징학회 2007 마이크로전자 및 패키징학회지 Vol.14 No.4

A $CaAl_{12}O_{19}:Mn^{4+}$ red phosphor showed the highest emission intensity at a concentration of 0.02mole $Mn^{4+}$ and the high crystallinity and luminescent properties were obtained at $1600^{\circ}C$ firing temperature for 3hr. The synthesized phosphor showed a broad emission band at 658nm wavelength. Red light-emitting diodes(LEDs) were fabricated through the integration of on InGaN UV bare chip and a 1:3 ratio of $CaAl_{12}O_{19}:Mn^{4+}$ and epoxy resin in a single package. This coated LED can be applicable to make White LEDs under excitation energy of UV LED.

조경기술사 시험의 출제경향 - 현행 기출문제에 대한 수험생의 인식정도를 중심으로 -

강현구,김학범,Kang, Hyun-Goo,Kim, Hak-Beom 한국조경학회 2010 한국조경학회지 Vol.38 No.5

This research analyzed the overall issues pertaining to the questions that appear in the professional landscape architect screening system to assess 1he recognition of test-takers when it comes to the test questions in terms of the question objectivity, appropriateness, difficulty level and so forth The purpose of this is to present a set of recommendations so that the screening system can he improved and the professional landscape architect screening system consolidate its position. This in turn can help the professional landscape architect qualification process consolidate its position and improve the status of the landscape area in the industrial field. The research of this study was conducted for the all-round development of Landscape Architecture. The research method was divided into two stages, and a group of experts was leveraged to study subjects that are tested and subjects allocated. A survey was conducted of candidates and certification holders to assess the questions that appear in the test in terms of their level, objectivity, difficulty level, tendency of questions and so forth. Firstly, the study demonstrated that the subjects tested in the professional landscape architect test are different from the testing subjects that are suggested in the enforcement ordinance of the National Technical Professional Law. In addition, o1her problems include the overvaluation of a subject for testing, a lack of objectivity in testing, and difficulty level adjustment of questions. One main reason for many of these kinds of problems is that the questions appeared without thorough review and there is a lack of management concerning the members of the commtittee that develops the question. Accordingly, to make up for these problems, a viable screening system such as the reorganization of subjects that are tested, assigning suitable subjects, securing of question objectivity, and difficulty level of developed questions are necessary.

중복도 격간벽 구조시스템의 내진성능평가

강현구,이준호,김진구,Kang, Hyun-Goo,Lee, Joon-Ho,Kim, Jin-Koo 대한건축학회 2011 대한건축학회논문집 Vol.27 No.9

In this study seismic performance of rectangular reinforced concrete staggered wall system(SWS) structures with middle corridor were evaluated. To this end, 6, 12, and 18-story SWS structural models were designed and were analyzed by pushover analysis to observe the force-displacement relationship up to failure and the location of plastic deformation. Also response modification factors were computed based on the overstrength and the ductility capacities obtained from capacity envelopes. The analysis results showed that plastic hinges formed first at connection beams located between two staggered walls and the structures failed by formation of weak stories. When the bending rigidity of the connection beams increased up to 100%, the overstrength increased by only about 25%. When the reinforcement ratio was increased by 50%, the overstrength increased by about 40%. The replacement of the RC connection beams with steel box beams resulted in superior performance of the structures with reduced beam depth. The response modification factors ranged between about 4.0 and 6.0 with the average value around 5.0. Based on these observation it was concluded that the staggered wall systems with a middle corridor have enough capacity to resist the design seismic load.

Ag 코팅한 W-Ag 전기접점/Cu 모재간의 브레이징 접합 특성

강현구,강윤성,이재성,Kang Hyun-Goo,Kang Yun-Sung,Lee Jai-Sung 한국분말야금학회 2006 한국분말재료학회지 (KPMI) Vol.13 No.1

The brazing adhesion properties of Ag coated W-Ag electric contact on the Cu substrate have been investigated in therms of microstructure, phase equilibrium and adhesion strength. Precoating of Ag layer ($3{\mu}m$ in thickness) on the $W-40\%Ag$ contact material was done by electro-plating method. Subsequently the brazing treatment was conducted by inserting BCuP-5 filler metal (Ag-Cu-P alloy) layer between Ag coated W-Ag and Cu substrate and annealing at $710^{\circ}C$ in $H_2$ atmosphere. The optimum brazing temperature of $710^{\circ}C$ was semi-empirically calculated on the basis of the Cu atomic diffusion profile in Ag layer of commercial electric contact produced by the same brazing process. As a mechanical test of the electric contact after brazing treatment the adhesion strength between the electric contact and Cu substrate was measured using Instron. The microstructure and phase equilibrium study revealed that the sound interlayer structure was formed by relatively low brazing treatment at $710^{\circ}C$. Thin Ag electro-plated layer precoated on the electric contact ($3{\mu}m$ in thickness) is thought to be enough for high adhesion strength arid sound microstructure in interface layer.

액숀 의미구조를 통한 객체지향 언어의 의미 고찰

강현구(Hyun-Goo Kang),도경구(Kyung-Goo Doh) 한국정보과학회 1997 한국정보과학회 학술발표논문집 Vol.24 No.2Ⅳ

본 논문에서는 간단한 객체지향 언어에 대한 의미를 액숀 의미 구조로 표현하여 보고, 이를 통해 객체 지향 언어의 정형적 의미(formal semantics)를 액숀 의미구조를 통하여서는 어떻게 이해 할수 있는지를 고찰한다.

차량 충돌에 의한 기둥의 콘크리트 기초 접합부 거동 평가

강현구(Hyun-Goo Kang),김진구(Jin-Koo Kim) 한국콘크리트학회 2014 콘크리트학회논문집 Vol.26 No.3

특이 섭동 이산시 쌍일차 계통에서의 폐루프 추적 제어기 설계

강현구(Hyun-Goo Kang),김범수(Beom-Soo Kim),최원호(Won-Ho Choi),권요한(Yo-Han Kwon),임묘택(Myo-Taeg Lim) 대한전기학회 1999 대한전기학회 학술대회 논문집 Vol.1999 No.7

엑스선 광전자 분광법을 이용한 고분자 박막 분석 기술

강현구(Hyun Goo Kang),김명웅(Myungwoong Kim) 한국고분자학회 2016 고분자 과학과 기술 Vol.27 No.3

초빙광고 자료를 활용한 봉직 의사의 급여수준과 관련요인

강현구(Hyun Goo Kang),이지형(Ji Hyung Lee),정다두(Da-Doo Jung),이무식(Moo-Sik Lee) 한국농촌의학 지역보건학회 2021 농촌의학·지역보건 Vol.46 No.1

의료 공급자인 의사의 급여수준을 파악하는 것은 매우 중요한 보건의료 정책연구의 주제 중의 하나이다. 이 연구는 봉직의사의 급여 수준의 기술적 분포를 파악하고, 봉직의사의 급여수준에 영향을 미치는 결정요인을 도출하였다. 연구대상 자료는 ‘초빙닷컴(www.chobing.com)’의 의사 초빙정보 사이트에서 2016년 5월부터 2019년 5월까지 게시된 4,014개의 구인광고 건 사례였다. 이 연구는 단면연구로 봉직의사의 구인광고에 제시된 월평균 급여액을 종속변수로 초빙전문과목, 근로 지역, 채용 시기, 당직 여부, 사택여부, 퇴직금 제공 여부, 추가적인 인센티브 제공여부 등을 독립변수로 단변량 분석과 다중회귀분석을 실시하였다. 연구의 주요결과는 첫째, 봉직의사의 월평균 급여는 1,540만 원, 표준편차 390만 원이었고, 전문과목별 월평균 급여는 정형외과가 2,124만 원으로 가장 높았고, 진단검사의학과가 1,140만 원으로 가장 낮았다. 지역 별로 경남이 1,708만 원으로 가장 높았고, 서울이 1,405만 원으로 가장 낮았다. 둘째, 단변량 분석에서는 평균 급여의 경우, 외과계, 기타 과, 내과계 순으로 유의한 차이가 있었으며(p<0.05), 비메이저 과목, 지역이 도일수록, 영·호남일수록, 야간 당직이 없을수록, 사택 제공이 있을수록, 퇴직금이 없을수록, 인센티브가 있을수록 유의하게 높았다(p<0.05). 표준화 급여에서는 외과계, 내과계, 기타 과 순으로 유의한 차이가 있었으며(p<0.05), 비메이저 과목일수록, 도일수록, 제주 및 영·호남 순으로, 시기별로는 1분기와 3분기일수록 유의하게 높았다(p<0.05). 셋째, 다중회귀분석 결과, 평균 급여는 비메이저 과목일수록, 사택 제공이 있는 경우, 퇴직금이 없는 경우, 인센티브가 있는 경우가 유의한 기여변수였으며(p<0.05), 표준화 급여에서는 비메이저 과목일수록, 인센티브가 있을수록, 지역이 도일수록 유의한 기여변수로 도출되었다(p<0.05). 따라서 이 연구는 전문과목별, 지역별, 기타사택 제공 여부, 퇴직금 지급 여부, 기타 인센티브 지급여부 등이 결정요인임을 확인하였다. 그러나 이 연구는 단면연구로서 추후 보다 심층적인 연구가 요구된다. Backgrounds: Proper distribution and supply of physicians are factors that affect national health care systems. This study investigated the payment distribution levels and the determinants that influence the salary levels of hospital hired physicians. Methods: We analyzed 4,014 job advertisements posted on an internet invitation information site about physician recruitment from May 2016 to May 2019. We used univariate analysis to determine the relationship between average monthly salary and the other related variables. Multiple regression analysis was used to determine the predictors of physician salary level. Results: The average monthly salary for the service physician was 15.4 million won, highest for orthopedic surgeons with 22.24 million won, and lowest for diagnostic laboratory physician with 11.4 million won. The factors significantly associated with average monthly salary were; non-major specialty, housing provision, no severance pay, and incentives(p<0.05). Non-major specialty, incentives, and the regions were predictors of the average standardized monthly salary(p<0.05). Conclusion: Factors associated with average monthly salary as revealed by this study were; medical specialty, hospital regional location, housing provision, payment of retirement allowance, and payment of other incentives respectively. However, this study was a cross-sectional study, and further studies will be required.

우상복통을 주소로 내원한 27세 남자에서 대망경색

강현구 ( Hyoun Goo Kang ),이현재 ( Hyun Jai Lee ),이재영 ( Chea Yong Yi ),나경준 ( Gyoung Jun Na ),백현철 ( Hyun Choul Baek ),김정훈 ( Jung Hun Kim ),김상현 ( Sang Hyun Kim ) 대한내과학회 2007 대한내과학회지 Vol.73 No.5

A rare primary segmental omental infarction in an adult. Infarction of a part of the greater omentum has been recognized as an uncommon condition that may mimic other acute abdominal conditions, particularly acute appendicitis and acute cholecystitis. The presentation and course are seldom typical of appendicitis or cholecystitis. A greater omental infarction may occur without a recognizable cause, and may be termed primary (idiopathic), but in some cases, a cause is discovered, such as; mechanical interference with the blood supply to the omentum secondary to torsion, or systemic disorders such as cardiac, vascular, and hematological disease. The inflammatory necrotic mass resulting from the infarction produces somatic pain at its location in the abdomen. For unknown reasons the infarction occurs most commonly in the right half of the abdomen, especially the lower quadrant. An sign of peritoneal irritation, tenderness, and muscle guarding are the principal findings elicited on palpitation of the abdomen. Occasionally, a point of exquisite tenderness may be detected; this usually corresponds to the site of the infarction. Recognizing the typical imaging featuresan ovoid or cake-like mass in the omental fat with surrouding inflammatory changesof this condition is important, as most cases can be managed without surgery. We report a case of an adult patient with acute abdominal pain who was diagnosed with a right-sided segmental omental infarction.(Korean J Med 73:525-529, 2007)