http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
알루미늄의 첨가와 열처리가 연강의 응력부식성질에 미치는 영향
김신,변수일 한국부식학회 1981 Corrosion Science and Technology Vol.10 No.1
The effects of Al addition and heat treatment on the stress corrosion behaviour of mild steel (0.03∼0.04%) in the aqueous solution containing 860g Ca(NO₃)₂ 4H₂O and 30g NH₄NO₃ per liter of solution was studied at the boiling temperature (11℃) using constant strain method (U-bend specimen). The resistance to SCC (stress corrosion cracking) of mild steel was studied with various Al contents of 0%, 0.04%, 0.45%, 0.65%, 0.96%, 1.28% and 1.52% by weight after annealing at 1150℃ for 1h, then furnace-cooled to room temperature. The effect of heat treatments (furnace-cooled, oil-quenched, water-quenched, and water-quenched then tempered at 500f7 for 1h) m the resistance to SCC was studied with the specimens of 0.04% and 0.45% Al content. Induction period, crack propagation period and rate were determined by extrapolation of measured maximum crack depth at different exposure time to the corrosive environment. In this study incluction period and crack propagation rate are considered to be toe measure of resistance to SCC of mild steel. All specimens showed 1 or up to 3 crack on an U-bend specimen which propagated along grain boundary (intercrystalline SCC). For furnace-cooled specimens the resistance to SCC increased as Al content increased from 0% up to 0.65%, then decreased up to 1.52% Al. The two staged variation of the resistance to SCC in mild steel was discussed in terms of tendency of Al nitride formation and grain size of specimens respectively. Tempered specimens with Al contents 0.04% and 0.45% skewed higher resistance to SCC than water-quenched and this is considered to be due to the decrease in carbon concentration at the grain boundary.
경유의 방향족 함량 변화가 배출가스에 미치는 영향 연구
김신,민경일,임의순,하종한,나병기,Kim, Shin,Min, Kyong-Il,Yim, Eui-Soon,Ha, Jong-Han,Na, Byung-Ki 한국응용과학기술학회 2014 한국응용과학기술학회지 Vol.31 No.4
미국과 유럽 등지에서는 자동차용 경유의 방향족 함량이 대기 환경오염의 원인물질로 추정하고 있다. 경유의 총 방향족 및 다고리 방향족 함량 감소가 환경 유해배출가스 HC, NOx, PM 등을 감소시키기 때문이다. 국내에서도 급변하고 있는 차량기술 및 연료품질간의 상관성 규명이 필요한 실정이다. 따라서 본 연구에서는 국내 실정에 맞는 차량과 연료간의 상호작용에 의하여 발생될 수 있는 환경적 영향평가를 진행하였으며 대상으로는 2.2L급 국내 대표 차량 2종(DPF 유 무)과 국내 정제기술로 생산된 5종의 연료를 통하여 경유의 방향족 함량에 따른 배출가스 특성을 분석하였다. According to reports in EU and USA, Aromatic ingredient in diesel estimated the causative agent of air pollution. Because reduction of total aromatic and Poly-aromatic compound content are decreasing environmentally harmful emissions HC, NOx, PM. It is necessary to investigate correlationship between automotive technology and fuel quality in Korea. This study examines emission effect of two representative domestic vehicles(2.2 L for emission of Euro 4, 5) and five kinds of domestic diesel fuel (total aromatic compound content 26, 28, 30 wt% and poly-aromatic compound content 3, 5 wt%). Finally, Environmental impact assessment was studied between vehicle and diesel fuel.
Estimation of time-dependent reaction coefficient with extended Kalman filter approach
김신,Kyung-Youn Kim,Cheng-Hung Huang 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
This work introduces an extended Kalman filter (EKF) to the estimation of the unknown time-dependent reaction coefficient based on the concentration measurement data. An autocatalytic reaction pathway is chosen as a model problem. This inverse estimation algorithm does not assume any functional form of the reaction coefficient. The performance of the proposed algorithm is verified through the numerical experiments with the exact and the contaminated concentration measurement data.
김신 한국고지도연구학회 2009 한국고지도연구 Vol.1 No.1
First, Korea was appeared in 13th century and carried a strong historic emphasis on antique mapmaker passing through the middle ages. As it is looked on the middle age's map, Korean historic and geograhical importance was come out on the world map. Second, from 16th century to 19th century, Korea had been gradually appeared and had a concrete shape in the world map including shape, naming and a form of government. And it is shown today's Korean map features. Third, Korean map feature have been changed and embodied by japan's annexation since 1910. It is shown that it is deeply related with establishment of International Hydrographic Organization in 1921 when Korea was under Japanese rule. Forth, imperialistic international relations of the 19th century had an influence on Korean role in the world map. Fifth, Korean role of the world map made in the 20th century' s international relationship was nor yet improved nevertheless changes of the 21th century. So, world maping which is suitable marine environment of the 21th century is neccesary and should propose solutions which world could accept for doing so. Sixth, a new gobal standard which world could agree and share is needed.
김신 한국인터넷비즈니스학회 2000 인터넷비지니스연구 Vol.1 No.1
산업혁명후 영국의 부자와 중간계급이 더 부유해졌다는 단순한 이유 때문에 가난한 사람들은 상대적으로 더욱 가난해졌다는 사실은 무엇을 말해주는가. 가난한 사람들이 그들의 한계선상에 이른 바로 그시기에 부자와 중간계급은 여분의 자본으로 철도에 마구 투자하였고 크고 빛나는 기구들을 구입했으며, 궁전과 같은 도시의 건물에 돈을 쓰고 있었다. 반면 기술적 진보에 의해 대체된 몰락하는 산업과 직업 중의 하나가 농업노동자들이었다. 또한 50만의 베틀 방직공들은 더욱더 값싼 임금을 받고 일함으로써 새 기계들과 경쟁하려는 헛된 시도를 하면서 점차 굶주림을 겪게 되었다. 이미 우리들은 비트의 배를 타고 사이버 대륙으로 향하고 있다. 인터넷혁명의 성공여부는 그 당사인 국민, 정부의 의지에 달렸다는 것이 문명사적으로 본 결론이다. 인터넷의 충격은 혁명적이라고 했지만 혁명은 기존질서의 파괴이며, 새로운 질서의 창조이다. 이 경우의 질서는 어떤 종류의 지식이자 가치인 동시에 파워구조, 파워관계를 표현하고 있다. 인터넷 혁명에서 소외된 계층을 고려하는 정책이 최우선 과제라고 할 수 있다.