高爐슬래그를 굵은 骨材로 사용한 콘크리트의 配合設計에 관한 硏究

金永寅,李彩奎 조선대학교 국토개발연구소 1989 국토개발연구 Vol.9 No.1

Blast furnace slag, by-product of iron industry has used widely as reclamation materials for pavement or harvour construction. The study which make blast furnace slag used as aggragate for concrete have being actived because of natural aggregate insufficiency, By many repoters, it has been proved that blast furnace slag could used as aggregate. This study is aimed to suggeste the relationship of δ_28-C/W, the real table of concrete mixing in order to use blast furnace slag as aggregate in field and to compare the concrete with blast furnace slag aggregate with the concrete with crushed storn aggregate. The result of this study are follow, 1] The relationship of δ_28-C/W is δ_28= -129+119*(C/W) (r=0.84) 2] The strength of concrete with blast furnace slag aggregate is greater than the strength of concrete with crushed storn 3]By comparing unit material of two concretes, the concrete with blast furnace slag aggregate is more economic than the concrete with crushed storn. In this paper, the real table of concrete mixing to be used in field is suggested.

기계학습을 활용한 하절기 기온 및 폭염발생여부 예측

김영인,김동현,이승오,Kim, Young In,Kim, DongHyun,Lee, Seung Oh 한국방재안전학회 2020 한국방재안전학회 논문집 Vol.13 No.2

Climate variations have become worse and diversified recently, which caused catastrophic disasters for our communities and ecosystem including economic property damages in Korea. Heat wave of summer season is one of causes for such damages of which outbreak tends to increase recently. Related short-term forecasting information has been provided by the Korea Meteorological Administration based on results from numerical forecasting model. As the study area, the ◯◯ province was selected because of the highest mortality rate in Korea for the past 15 years (1998~2012). When comparing the forecasted temperatures with field measurements, it showed RMSE of 1.57℃ and RMSE of 1.96℃ was calculated when only comparing the data corresponding to the observed value of 33℃ or higher. The forecasting process would take at least about 3~4 hours to provide the 4 hours advanced forecasting information. Therefore, this study proposes a methodology for temperature prediction using LSTM considering the short prediction time and the adequate accuracy. As a result of 4 hour temperature prediction using this approach, RMSE of 1.71℃ was occurred. When comparing only the observed value of 33℃ or higher, RMSE of 1.39℃ was obtained. Even the numerical prediction model of the whole range of errors is relatively smaller, but the accuracy of prediction of the machine learning model is higher for above 33℃. In addition, it took an average of 9 minutes and 26 seconds to provide temperature information using this approach. It would be necessary to study for wider spatial range or different province with proper data set in near future.

극저온 냉동기(II)

김영인,장호명,Kim Y. I.,Chang H.M. 대한설비공학회 1990 설비저널 Vol.19 No.1

극저온 냉동기(1)

김영인,장호명,Kim Y. I.,Chang H. M. 대한설비공학회 1989 설비저널 Vol.18 No.6

극저온용 냉동기 개발

김영인,강보선,김용찬,Kim Y. I.,Kang B.S.,Kim Y. C. 대한설비공학회 1989 설비저널 Vol.18 No.2

과학산업의 육성책으로서 정부에서는 1988년도부터 특정출연연구 개발과제로 극한기술 개발을 시작하였다. 본 연구개발 과제는 극한기술의 5개 분과중 하나인 극저온 기술 분야에서의 연구개발목표인 SQUID(Superconductive Quantum Interference Devices)의 냉각장치로 사용되는 극저온용 냉동기 개발이다. 1988년부터 3년간, 연구개발비 약 3억원을 투자하여 작동온도 4.2K에서 약 100mW의 냉각능력을 갖는 냉동기에 대한 시제품을 개발함이 목적이다. 본 기술논문에서는 지난 6개월간의 연구수행 내용을 개략적으로 기술하여 연구진행상황을 파악할 수 있도록 하였다.

국내 항공전자 자격제도 도입을 통한 항공산업의 발전 전략

김영인 한국항공운항학회 2020 한국항공운항학회지 Vol.28 No.3

Avionics is a compound word of aviation and electronics that began to be used in the late1930s. In the components or sub-systems installed to the aircraft, avionics is something thatworks by electronic technology. In the past, the aircraft mate, the flight engineer, and theradar operators performed the work on board the aircraft but the modern aircraft havereplaced these tasks with avionics. the aircraft mechanics who maintain and manage suchcomplex aircraft must have expertise and technics with the development of avionics tomaintain aircraft airworthiness. This paper is about the introduction of domestic avionicsqualification system and the development of avionics maintenance technology. For this, theSWOT analysis is performed by identifying the internal and external environment. Andrecommend the strategy and direction of domestic avionics qualification and education system.

폭풍해일 침수예상도 검증을 위한 형상유사도 분석 : 형상기준

김영인,김동현,이승오 한국방재안전학회 2019 한국방재안전학회 논문집 Vol.12 No.3

The concept of shape similarity has been applied to verify the accuracy of the SIND model, the real-time prediction model for disaster risk. However, the CRITIC method, one of the most widely used in geometric methodology, is definitely limited to apply to complex shape such as hazard map for coastal disaster. Therefore, we suggested the modified CRITIC method of which we added the shape factors such as RCCI and TF to consider complicated shapes. The matching pairs were manually divided into exact-matching pairs and mis-matching pairs to evaluate the applicability of the new method for shape similarity into hazard maps for storm surges. And the shape similarity of each matching pair was calculated by changing the weights of each shape factor and criteria. Newly proposed methodology and the calculated weights were applied to the objects of the existent hazard map and the results from SIND model. About 90% of exact-matching pairs had the shape similarity of 0.5 or higher, and about 70% of mis-matching pairs were it below 0.5. As future works, if we would calibrate narrowly and adjust carefully multi-objects corresponding to one object, it would be expected that the shape similarity of the exact-matching pairs will increase overall while it of the mis-matching pairs will decrease. 실시간 재난위험도 예측 모델인 SIND 모델의 정확도 확인 및 검증을 위해 다양한 형상유사도 개념을 적용하였다. 기하학적 방법론 중에서 가장 널리 이용되는 CRITIC 기법은 침수예상도와 같은 복잡한 지형 형상에 적용하기에는 분명한 한계점을 보여서 본 연구에서는 복잡한 전파특성의 형상을 평가할 수 있는 RCCI와 TF 등과 같은 형상인자를 추가하여 수정된 CRITIC 기법을 제시하였다. 본 연구에서 제안된 형상유사도 평가 방법을 폭풍해일의 침수예상도에 적용하여 검토한 결과, 면 객체 쌍들을 수동으로 정 매칭쌍과 오 매칭쌍으로 구분하였으며, 각 형상 인자들, 위치기준, 면적기준, 형상 기준의 가중치들을 변화시켜가며 각 매칭쌍의 형상유사도를 산정하였다. 본 연구에서 제안된 방법론과 산정된 가중치를 참고자료인 침수예상도의 지도 객체와 목표자료인 SIND 모델결과의 객체에 적용한 결과, 정 매칭쌍은 약 90%가 형상유사도 0.5 이상의 값을 가졌고, 오 매칭쌍은 약 70%가 0.5 미만으로 나타났다. 향후 다수의 객체가 하나의 객체와 대응되는 점을 보완 조정한다면 정 매칭쌍의 형상유사도는 전체적으로 증가하고 오 매칭쌍의 형상유사도는 감소할 것이라 판단된다.

LNG 냉열발전

김영인,Kim, Young-In 대한설비공학회 1986 설비저널 Vol.15 No.1

Structural and Photoluminescent Properties of Near-Infrared Emissive Bis(2,3-Diphenylbenzoquinoxalinato)(2-Pyrazinecarboxylato)ridium(III)

김영인,윤성재,김대영,강성권 대한화학회 2018 Bulletin of the Korean Chemical Society Vol.39 No.1

C-C 복합재료와 Graphite 노즐목 내열재의 침식조직 특성에 대한 연구

김영인,이수용 항공우주시스템공학회 2017 항공우주시스템공학회지 Vol.11 No.5

The solid rocket motor(SRM) consists of a motor case, igniter, propellants, nozzle, insulation, controller, and driving device. The liquid rocket propulsion systems(LRPSs) cools the nozzle by the fuel and oxidizer but SRM does not cool the nozzle. The nozzle of SRM is high temperature condition and high velocity condition so occurs the erosion by combustion gas. This erosion occurs the change of nozzle throat and reduces thrust performance of rocket. The material of Rocket nozzle is minimization of erosion and insulation effect and endure the shear force, high temperature and high pressure. The purpose of this study is to investigate the erosion characteristics of solid rocket nozzles by each combustion time. Through the structure inspection of Graphite and C-C composite, identify the characteristics of the microstructure before and after erosion. 고체추진 로켓(SRM)은 모터케이스, 점화기, 추진제, 노즐, 절연체, 제어 및 구동장치 등으로 구성되어있으며 액체로켓과 다르게 노즐을 냉각시킬 수 없어 고온 및 고속의 연소가스에 의해 침식(Erosion)이발생한다. 이러한 침식현상은 노즐목의 형상 변화를 일으키며 로켓의 추력 성능을 감소시킨다. 로켓 노즐의 재질은 침식현상을 최소화하고 열을 차단시키는 효과가 있어야 하며 용융 상태에서 소실되지 않고 전단력이나 압력에 견딜 수 있어야 한다. 본 연구는 실험을 통하여 고체로켓 노즐의 재질에 대하여연소시간별 침식특성을 파악한다. 그리고 Graphite와 C-C 복합재료의 각 재질별 조직검사를 통하여 침식후의 미세특징을 비교 분석하여 침식특성을 규명한다.