http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
熔融 Fe-Cr合金의 浮揚熔滴法에 依한 表面張力의 測定
鄭元培 부산대학교 공과대학 1985 硏究報告 Vol.29 No.-
Surface tensions of liquid Fe-Cr alloys along with pure iron and pure chromium were measured using the levitated droplet technique together with a Fourier wave analyzer for measuring the oscillatory frequency. It has been found out that chromium is not surface-active at all contrary to other investigators' results. Problems associated with the use of the Fourier wave analyzer for the levitated droplet technique were discussed.
정원배,정원섭,이대열,신형기,김영혁 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.9
In order to investigate stepwise reduction behaviors of iron ore pellets, CVRD pellets were reduced stepwise from Fe₂O₃ to Fe₃O₄, Fe₃O₄, to FeO and finally FeO to Fe with H₂-H₂O gas mixtures at 700-900℃. Chemical reaction rate constant(k_(ci))and effective diffusivity(D_(ei)) calculated from the mixed control plots based on the unreacted core model were decreased with proceeding of the reduction step and increased with the increase of the temperature, respectively. In the case of 900℃, k_(ij) was increased with proceeding of the reduction step. k_(ij), for each reduction steps are expressed by following equations, respectively. k_(cm) = exp(3.262-3.563×10³/RT) (㎝/sec) k_(cw) = exp(5.261-6.496×10³/RT) (㎝/sec) k_(efe) = exp(11.979-13.616×10³/RT) (㎝/sec) In the intermediate model, Thiele's modulus(Φ') was increased with proceeding of the reduction step, but effectiveness factor(E_f) was decreased contrary to Φ'. Reduction curves calculated by using the rate parameters for stepwise reduction were agreed with experiments in the intermediate model than in the unreacted core model.
철광석 소결광의 Slag Volume 재평가 : 철광석 소결광중의 칼슘페라이트 제어-1 Control of calcium ferrite in iron ore sinter-1
정원배,정원섭,이대열,신형기,문석민 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.3
Low SiO₂ and high basicity sintering tests were carried out to reduce the slag volume in sinter without causing any deterioration of sinter properties. New slag volume(NSV) was defined instead of slag volume as the concept of content of bonding material. Low SiO₂ and high basicity sintering condition reduced the slag volume from 21.0% to 19.3% without any deterioration of the productivity and the strength of sinter. The strength of sinter was determined to be highly dependent on the content of calcium ferrite. NSV, defined as the sum of slag volume and calcium ferrite content, proved to be a useful index for the strength of sinter. NSV increased with the decrease of SiO₂during fixed CaO content due to the increase of calcium ferrite although slag volume decreased. In pot tests, as SiO₂ content decreased from 5.90% to 5.28% while CaO remained at 10.5%, the productivity and the strength of sinter tended to improve.
鄭元培 부산대학교 공과대학 부설 생산기술연구소 1979 硏究報告 Vol.19 No.-
Variations of major electrical design parameters of electric smelting furnace for ferrosilicon(75‰Si) making with increasing furnace capacity were discussed with emphasis on relationship between design parameter and electrode diameter. Necessary data about furnaces, which are operating in good condition, was obtained through a wide literature survey. Results obtained are summarized as follows 1. Optimum operating furnace load increases with increasing electrode diameter as shown in following regression equation with deviation less than ±15%. P=(5.04D³+521.3D²)×10^(-3) 2. Generally electrode spacing appears to range from 2.2 to 2.4 times of electrode diameter. 3. Optimum range values of both electrode power density and hearth power density tend to increase linearly with increasing electrode diameter. 4. Equivalent specific resistance of charging mix tends to range from 0.4 to 0.5Ω cm although it is. subject to some variation depending on characteristics of raw materials. 5. Electrode current density seems to range from 6 to 7 A/㎟.
산화철 펠렛 H2 및 Co 가스 환원시 기공구조의 변화
정원배,이대열,신형기 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.2
In order to investigate relationship between characteristics of pore texture such as porosity, diameter and shape factors and reduction behaviors of ferric oxide pellets, pore texture of pellets reduced with H₂ and CO gas at 700-900℃ were analysed with image analysis system. Reduction rate of H₂ gas was faster than that of CO gas. It was confirmed that reduction behaviors with H₂ gas could be analysed by the intermediate model, but that one with CO gas could be analysed by the unreacted core model. Porosity of pellets in the Fe₂O₃→Fe₃O₄ reduction stage was increased, but that of the Fe₃O₄→FeO and FeO→Fe was gradually decreased. In each reduction stage, porosity was decreased in the temperature range from 700℃ to 900℃, and this decrease of porosity was greater in the reduction by H₂ gas than that by CO gas. Mean diameter of pore was increased with proceeding of the reduction stage and was the biggest in the Fe₃O₄→FeO stage. In each reduction stage, porosity was decreased with the increase of temperature. Shape of pores such as roundness, aspect ratio and fullness ratio was rapidly worsened in the Fe₂O₃→Fe₃O₄ stage, but gradually improved in the reduction stage from magnetite to metal iron.
이대열,정원배 釜山大學校生産技術硏究所 1997 生産技術硏究所論文集 Vol.52 No.-
최근 환경규제가 강화되면서 주로 매립에만 의존하던 제철공정에서 발생하는 분진 및 슬러지 등의 폐기물을 재활용하는 연구가 진행되고 있다. 소결공정에서 발생하는 전기집진 분진(Fe₂O₃원)과 석회석 수세시 발생하는 슬러지(CaO,원)를 7:3 비율로 혼합한 후 1150∼1200℃에서 소성하여 철광석 소결광의 결합물질인 Calcium ferrite를 인위적으로 제조하였으며 이를 소결원료중 석회석과 대체하여 소결모사 시험을를 실시한 결과 소결생산성 및 소결광의 강도가 향상되었다. Recently, anti-pollution technologies have become a necessity and are required to protect the environment of the air, ground and water. A total recycling system was studied in order to produce the synthetic calcium ferrite (SCF) from wastes including a sinter waste E.P. (Electrostatic Precipitator) dust and limestone sludge, to be used as the flux in the sintering process. SCF could be made from a sinter waste E.P. dust and limestone sludge in a mixing ratio of 7:3 at a sintering temperature of 1150∼1200℃. In sinter simulation pot tests, the productivity and strength of the sinter showed a tendency to improve as the substitution ratio of the SCF increases from 0 to 50%.
미래예측을 통한 학부 호텔 경영학과 교과과정에 관한 연구
정원배(Jeong Won Bae),전희원(Jeon Hui Won) 한국호텔외식관광경영학회 2004 호텔경영학연구 Vol.13 No.1
The purpose of this study is to design a education programs specification model for hotel management course. The challenge of undergraduate preparation for professions in the hotel industry of the future is upon us. The knowledge and competencies that may be required of graduates from baccalaureate hotel management programs in the year 2015 may be determined in part by the findings and conclusions of this study. The purpose of this study was to identify the knowledge and capability that undergraduate hotel education programs should develop and teach to best prepare students for entry-level managerial positions in the hotel industry, to identify emerging trends related to new managers` undergraduate preparation.