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Dolomite 로 부터 고토인안비료 제조의 기초적 연구
김창은 한국화학공학회 1972 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.10 No.1
This investigation was carried out to produce a high quality magnesium compounded fertilizer by initially dissolving calcined dolomite in sea water to form the intermediate Mg(OH)₂ precipitate, and reacting this intermediate with phosphoric acid and ammonia thereafter. The experimental results were obtained as follows; 1) The optimum calcination temperature of dolomite was about 950℃ for 30 minutes operation and in the displacement of the calcined dolomite in sea water, the optimum mole ratio of calcium hydroxide to magnesium chloride is 1:1.2 for 4 hours of the dissolution time. 2) The high yield of the magnesium compounded fertilizer was obtained, when the precipitate was reacted with 20% phosphoric acid and neutralized with 28% ammonium hydroxide thereby obtaining the alkalinity of the solution to pH 9. 3) By the results of X-ray diffraction and chemical analysis, the major component of the product was magnesium ammonium phosphate at the above condition and the fertilizing effect was also good.
알콕사이드로부터 Seed가 첨가된 알루미나의 제조: (II) 소결특성
김창은,임광일,이해욱 한국세라믹학회 1992 한국세라믹학회지 Vol.29 No.6
The sintering behaviors of seeded alumina from alkoxide were studied. Room temp. desiccated powder exhibited better sintering behavior due to its packing ability and powder activity. $\alpha$-Al2O3 2wt% seeded compacts sintered with 97.5%TD, 1~3${\mu}{\textrm}{m}$ diameters at 140$0^{\circ}C$, 2hrs. Fe-nitrate doped compacts resulted in enhanced initial sintering behavior due to ionic effects of Fe3+ but failed to refined microstructure.
Fuzzy Delpi 법(法)을 이용한 일반 지수 예측 시스템 구축
김창은,최환석,Kim, Chang-Eun,Choi, Hwan-Seok 대한산업공학회 1996 산업공학 Vol.9 No.1
The Delphi method is widely used for long and middle range forecasting in management science. It is a method by which the subjective data of experts are made to converge using statistical analysis. The Fuzzy Delphi Method(F.D.M.), anew application of the Delphi method using Triangular Fuzzy Numbers(T.F.N.), can help to predict the uncertainty, synthesize the opinion and calculation of those assumed dissemblance index and fuzzy distance. Furthermore, the programming of the F.D.M. process to feed paper and data back to experts can make them more accurately predict the various information.
항공기 안전운항을 위한 항공등화 보수방식 개선에 관한 연구 : 김포공항을 중심으로
김창은,심종칠,정철화,조한준 한국안전교육학회 1998 한국안전교육학회지 Vol.2 No.2
The role of airport lights system is to carry information as composing the way of lights, and to be designed and be deployed as that way. The crew see this way and know the related position between them and on airstrip, and receive a guide information on flight. Like this, offering analogue information being integrated each airport lights systems like approach lights or runway center line lights is the airport lights system. Because the guide information by the way of light is a direct-reading one by sight, even if it occurs mistakes, it is the things of human senses, such as, the blunder by a illusion or a daze, so you should make efforts to prevent accidents by the cooperation of inter-crews, and continuity with AVIONICS(Aviation Electronics) as a plan. For not only the spiritual safety of pilots, but also the offer of accurate visual information, the safe maintenance and management of airport lights increases the importance in view of the safe airpassage by the pilots nicely connecting two different information. If you maintain the airport lights possessing both reliance and safety through the improvement of repair way of Kimpo International Airport's light, you can previously prevent pilots from spoil a plan accident through the exclusion of human accident cause such as pilot s illusion by airport lights.
Fuzzy Delphi 法을 이용한 일반지수 예측 전문가 시스템 구축
김창은,최환석 한국경영과학회 1995 한국경영과학회 학술대회논문집 Vol.- No.1(2)
전문가 내지 구성원의 주관적인 의견에 의존하는 방법의 하나인 델파이법(Delphi Method)은 관련자료가 불충분한 중·장기 예측, 전략결정 등에 이용되고 있다. 이 방법은 더욱 발전시킨 퍼지 델파이법(FuzzyDelphi Method)은 델파이법에 퍼지숫자(Fuzzy Number)의 개념을 도입하여 정확한 예측을 하고자 하는 것이다. 또한 이러한 예측치가 삼각 퍼지 숫자(Triangular Fuzzy Number)로 주어져 불확실성에 대한 예측과 의견종합을 쉽게 하며 전문가에 의해 추정된 삼각 퍼지 숫자의 입력을 통해 그 추정치들의 비유사도(Dissemblance Index)와 퍼지거리(Fuzzy Distance)를 계산하고 간단한 그래프를 다시 전문가에게 피드백(Feedback)할 수 있도록 나타내어지는 과정을 Code화하여 전문가들로 하여금 다양한 정보를 통하여 좀 더 정확한 추정치를 예측하고자 한다.