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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.
크실렌 산화공정 냉각장치의 고장진단 전문가시스템의 구축
김창은,심종칠,주용준 한국산업안전학회 1996 한국안전학회지 Vol.11 No.4
We establish an expert system for the xylene oxidation reaction process of chemical plants using HAZOP(Hazard and Operability Studies). Our research focus is only reduced to the cooling system of the total chemical plant due to lack of information. This expert system shows the priority of reasons for the system failure using confidence factor.
턱관절 질환의 한의진료 임상현황조사를 위한 웹기반 설문조사
김창은,도호정,송현섭,신재권,이원준,김종호,이근재,윤영석,김노현,서창용,이윤재,김미령,조재흥,권미정,하인혁 한방재활의학과학회 2018 한방재활의학과학회지 Vol.28 No.1
Objectives While Temporomandibular disorders (TMD) is highly prevalent in Korea, studies examining its Korean medical treatment are currently lacking. The aim of this study was to assess current Korean medical treatment practice patterns for TMD. Methods A preliminary questionnaire was developed to investigate current practice patterns of TMD treatment and underwent further revision through external review. The final questionnaire was distributed as a web-based survey to 18,289 potential respondents by email. Results The response rate was 2.23%. Most participants replied that they received multiple Korean medicine interventions for TMD treatment consisting of such methods as acupuncture, chuna manipulation, electroacupuncture. The percentage of treatment services among uncovered services, which need to be covered by national health insurance was high in the order of pharmacopuncture, chuna manipulation, and herbal medicine. The most commonly used diagnostic examination tools for TMD was Physical examination and next was Imaging diagnosis. The frequency of TMD treatment was the highest at 2∼3 times per week (76%) and the period was from 4 to 12 weeks (63%). Conclusions This survey study helps determine current practice patterns of TMD, and recognizes the need for use of diagnostic devices in TMD treatment. These results are further anticipated to provide basic data for clinical practice guide lines (CPGs). (J Korean Med Rehabil 2018;28(1):73-84)
김창은,이보성 한국화학공학회 1972 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.10 No.3
Growth whisker was found during the deposition of pyrolytic carbon between 1300° and 1700℃ under reduced pressure. It is confirmed, that the growth whisker through the ceramic material of Al₂O₃-und SiO₂-Base was catalyzed. During its growth the whisker was distincted between the primary and the secondary growth whisker. In this report the growth rate of whisker was given for the first time. The rate was 25-43 u/sec in primary and 0.3-0.4 u/sec in secondary under the temperature of 1500℃ and 400 Torr. Carpet-rolled mechanism explained by Schlesinger was demonstrated in the secondary growth alone, and the screw-mechanism presumed by him was proofed in the primary growth through microscope.