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황준식,Hwang, Jun-Sik 한국방위산업진흥회 1994 國防과 技術 Vol.- No.179
곡사포탄은 적의 종심공격, 대포병사격, 적 전투차량 제압, 보병부대의 일반지원 등의 임무를 효율적으로 수행하기 위해 사거리 연장, 정확도 증대 및 위력증대의 3가지 목표를 극대화하는 방향으로 발전되어 왔다.
황준식,성건용,강광용,윤순길,이광렬,Hwang, Jun-Sik,Seong, Geon-Yong,Gang, Gwang-Yong,Yun, Sun-Gil,Lee, Gwang-Ryeol Materials Research Society of Korea 1999 한국재료학회지 Vol.9 No.1
(001) $\textrm{SrTiO}_3$(STO) 기판위에 고온초전도 $\textrm{YBa}_{2}\textrm{Cu}_{3}\textrm{O}_{7-x}$(YBCO)박막을 이용한 계단형 모서리 임계접합을 제조하였다. STO (100) 단결정 기판위에 계단형 모서리(step-edge)를 제작하기 위한 이온밀링 마스크로 plasma enhanced chemical vapor deposition방법으로 증착된 diamond-like carbon (DLC) 박막을 사용하였고, oxygen reactive ion etch 방법으로 건식식각하였다. 이렇게 제작된 계단형 모서리 기판위에 c-축 수직한 YBCO 박막과 STO박막을 pulsed laser deposition방법으로 에피텍셜하게 증착하였다. 계단의 상층과 하층에서 모두 임계가 형성되었으며 이 접합의 임계온도는 77 K 이상이었고 16K에서 $\textrm{I}_{c}\textrm{R}_{n}$products가 7.5mV, 77 K에서 0.3mV의 값을 나타내었다. 이들 전류-전압 특성은 two noisy resistively shunted Josephson junction 모델을 잘 만족하였다. We have fabricated high-$\textrm{T}_c$ superconducting $\textrm{YBa}_{2}\textrm{Cu}_{3}\textrm{O}_{7-x}$(YBCO) grain boundary junctions at a step-edge on (001) $\textrm{SrTiO}_3$(STO) substrates. A diamond-like carbon (DLC) film grown by plasma enhanced chemical vapor deposition were used as an ion milling mask to make steps on the STO (100) single crystal and was removed by an oxygen reactive ion etch process. The c-axis oriented YBCO and TO thin films were deposited epitaxially on the STO substrate with a step-edge by pulsed laser deposition. The grain boundary junctions were formed at the top and the bottom of the step. The junctions worked at temperatures above 77 K, and had I\ulcornerR\ulcorner products of 7.5mV at 16K and 0.3 mV at 77K, respectively. The I-V characteristics of these junctions showed the shape of the two noisy resistively shunted junction model.
폐식용유 바이오디젤을 이용한 압축착화엔진의 저부하 영역에서 연료의 분사 압력과 분사 시기가 연소 및 배기특성에 미치는 영향
황준식(Joonsik Hwang),정용진(Yongjin Jung),배충식(Choongsik Bae) 한국연소학회 2012 KOSCOSYMPOSIUM논문집 Vol.- No.45
In this study, the combustion and emission characteristics of waste cooking oil biodiesel was investigated. The fuel was injected from 5 CAD (Crank angle degree) ATDC (After top dead center) to ?60 CAD ATDC by 5 CAD with 800 bar and 1600 bar injection pressure. Generally, the hydrocarbon, carbon monoxide and smoke emissions from biodiesel fuel were lower than the emission levels of diesel fuel. However, the emission characteristic of biodiesel got worse than diesel when the fuel was injected earlier than ?30 CAD ATDC. NOx emission from biodeisel was higher than diesel fuel in all experimental conditions.
디젤 엔진 실린더 헤드의 워터 재킷 표면의 온도가 침식 및 부식에 미치는 영향
황준식(Joonsik Hwang),김동훈(Donghoon Kim),한상욱(Sangwook Han),배충식(Choongsik Bae),홍재웅(Jaewoong Hong),윤수환(Soohwan Yoon) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
In recent years, there have been reports of erosion on cylinder head water jacket from several vehicle manufacturers. The degree of erosion may cause deterioration in the cooling capabilities and serious damage to the engine. The reason for the erosion is widely known as repeating formation and collapse of bubble caused by temperature difference between coolant and surface temperature. Therefore, in this study, the erosion and corrosion behavior of water jacket was investigated with rectangular specimen under 3 different specimen temperature conditions (170℃, 200℃, 230℃). The experiment was conducted in test bench which provide the similar conditions as diesel engine cylinder head. The surface of specimen was visualized with SEM-images after 25hours of operation in the test bench and the weight was measured with precise mass scale. The surface composition of specimen which was exposed to coolant during the experiment was quantified with energy dispersive spectroscopy (EDS) analysis every 25hours in the experiment. From the results, the greatest differential rate of mass reductions were observed with highest surface temperature (230℃) experiment. The composition of aluminum and silicon on the specimen did not have clearly consistent tendency.