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정영우,김화정,안용식,최희락,Jeong, Young-Woo,Kim, Hwa-Jung,Ahn, Yong-Sik,Choi, Hee-Lack 한국재료학회 2018 한국재료학회지 Vol.28 No.7
For diamond/metal composites it is better to use diamond particles coated with metal carbide because of improved wettability between the diamond particles and the matrix. In this study, the coating of diamond particles with a chromium carbide layer is investigated. On heating diamond and chromium powders at $800{\sim}900^{\circ}C$ in molten salts of LiCl, KCl, $CaCl_2$, the diamond particles are coated with $Cr_7C_3$. The surfaces of the diamond powders are analyzed using X-ray diffraction and scanning electron microscopy. The average thickness of the $Cr_7C_3$ coating layers is calculated from the result of the particle size analysis. By using the molten salt method, the $Cr_7C_3$ coating layer is uniformly formed on the diamond particles at a relatively low temperature at which the graphitization of the diamond particles is avoided. Treatment temperatures are lower than those in the previously proposed methods. The coated layer is thickened with an increase in heating temperature up to $900^{\circ}C$. The coating reaction of the diamond particles with chromium carbide is much more rapid in $LiCl-KCl-CaCl_2$ molten salts than with the molten salts of $KCl-CaCl_2$.
인터널 마케팅이 관광호텔 조리직 종사원의 조직몰입에 미치는 영향
정영우(Young Woo Jung),이은용(Eun Yong Lee),이수범(Soo Bum Lee) 한국호텔외식관광경영학회 2004 호텔경영학연구 Vol.13 No.2
The purpose of this study is to develope the theoretical model for job satisfaction and organizational commitment by internal marketing. For this purpose, we have selected two factors as internal marketing, three factors as job satisfaction, and organizational commitment. The data was collected in the luxury hotels in Seoul area; 600 questionnaires were distributed but we manage to get 494 questionnaire as sample data. The results are followed: Internal communication affects positively on human relations, job volition and welfare system has a positive effect on job volition, work condition; in addition, both factors have effects on job volition. Organizational commitment is affected by the factor of job volition. work condition, and human relations.
노즐 용삭을 고려한 복합 소호형 차단기의 압력 상승 계산
배채윤(Cae-Yoon Bae),안희섭(Heui-Sup Ahn),정영우(Yong-Woo Jung),최종웅(Jongung Choi),오일성(Il-Sung Oh) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
Pressure rise is an important design factor and affects significantly on the characteristics of gas circuit breakers. For self-blast circuit breakers, the nozzle ablation plays important role in pressure-building up and should be properly considered for the accurate calculation. In this paper. the nozzle ablation is treated as a boundary condition and the pressure is calculated from mass fractions of PTFE and SF. . The amount of the ablated mass of a nozzle is assumed to be proportional to the arc energy and the area of nozzle surface that directly touches arc. The calculation result is compared with measured data and shows good agreement with it.