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주성민,방한서,곽시영 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
This study intended to verify the feasibility of laser-arc hybrid welding to dissimilar materials joints between high strength steel (AH32) and stainless steel (STS304L). For this, hybrid welding process for dissimilar materials was optimized by varying four parameters (welding speed, welding current, laser-arc distance, welding voltage) through Grey-based Taguchi analysis. A Grey relational analysis of the ultimate tensile strength (UTS), welding depth to width ratio (D/W) and absorbed energy (AE) attained from the Taguchi method can optimize the multiple-performance characteristics of the Grey relational grade. Moreover, hardness values microstructure and fatigue strength of welded joints fabricated under welding condition optimized by Grey-based Taguchi analysis were investigated. In the tensile test of welded joints, the damaged part was in BM of STS304L side. The hardness of welded joints exhibits within the acceptable range (the maximum value 340~360 Hv). Dissimilar materials hybrid welded joints exhibited almost same fatigue strength for similar material STS304L SAW welded joints and lied well above the design curve(level D) for JSSC.
消癌散의 경구투여에 의한 마우스 B16 흑색종 세포의 폐전이에 대한 항전이 효과
주성민,양휘훈,우원홍,정우열,조원준,이기영,전병훈,김원신 대한동의생리학회,대한동의병리학회 2001 동의생리병리학회지 Vol.15 No.6
We have examined the inhibitory effect of oral administration of Soamsan, a Korean traditional medicine, on lung metastasis by inoculation of mouse B16 melanoma cells into the tail vein. Oral administration of Soamsan for 20 days after tumor inoculation resulted in dose-dependent inhibition of lung metastasis. Soamsan at the dose of 40 mg/day/mouse for 20 days significantly inhibited the metastasis. Treatment with Soamsan (40 mg/days/mouse) for 7 days before and after tumor inoculation result in significant inhibition of lung metastasis. On the other hand, in the case of treatment with Soamsan for 7 days after 7 days from tumor inoculation, the inhibitory effect was not detected. Soamsan significantly inhibited the lung metastasis of B16 melanoma cells in mice pretreated with anti-mouse NK 1.1 monoclonal antibody and untreated nomal mice, whereas it did not inhibit efficiently metastasis in 2-chloroadenosine-pretreated mice. Also, Soamsan enhanced the antigen specific immune response by stimulating the activation of B lymphocytes (Kim et al., 2001). These results suggest that oral administration of Soamsan inhibited lung metastasis of B16 melanoma cells, possibly through a mechanism mediated by the activation of marcrophages and B lymphocytes in the host immune system.
주성민,방희선,한준의,김경학,안병호,Joo, Sung-Min,Bang, Hee-Seon,Han, Jun-Ui,Kim, Kyoung-Hak,Ahn, Byoung-Ho 대한용접접합학회 2013 대한용접·접합학회지 Vol.31 No.4
Nowadays, the weight lightening of automotive is required as conserving the environment has become a major worldwide issue. To solve this issue, various researches for the use of light materials(Alalloy, Mgalloy)and ultra high strength steel as substitutes of the current structural material have been carried out. Application of laser stitch welding to the assembly of automotive produces improvement in strength, lightening of body, higher fuel efficiency, lower production cost as well as reduction in assemble line due to its fast welding speed, superior accessible and weld quality. This process overcomes the shortcomings of the current resistance spot welding such as high electricity consumption, electrode replacement, and economical, technical limitation in design and production method of automotives.
주성민,김준성,문희장,양준서,이지형 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.3
The acoustic modes and combustion instability within a solid rocket combustion chamber are predicted and analyzed in the presence ofa movable pintle in the nozzle. The prediction of acoustic field is performed with a commercial finite element method code, and a combustioninstability diagnosis is conducted with the classical acoustic analysis by investigating the stability factors (alphas). The effect ofpintle position on the acoustic modes is analyzed by comparing the acoustic modes of cylindrical chambers with and without a pintle. Astability integral and alphas survey is carried out between the annular type chamber (resulting from the presence of the pintle) and thecylindrical chamber. Emphasis is placed on the changes in the nozzle throat area and on their respective stability integral when pintleposition varies. The stability behavior according to the presence of the pintle is analyzed using two major driving and damping factors. The stability analysis reveals that the acoustic mode with the pintle is more sensitive to the fourth longitudinal mode compared with theacoustic mode without the pintle. Meanwhile, other modes show analogous acoustic fields, and the second mode is highly dependent onpintle position.
호텔조리종사원의 내부마케팅과 직무만족, 조직 몰입, 이직의도 간의 관계 연구
주성민 한국외식경영학회 2022 외식경영연구 Vol.25 No.3
In this study, an empirical analysis was carried out for hotel cooks in Seoul Metropolitan City to find out the effect of internal marketing on job satisfaction, organizational commitment, and turnover intention. The survey was conducted from January 1 to January 30, 2022, and a total of 300 questionnaires were distributed and 258 copies were used for the analysis. As a result of the analysis, it was found that the internal marketing of hotel cooks had a significant positive (+) effect on job satisfaction, organizational commitment, and turnover intention. It is said that it needs to be expanded in a direction to reflect actual performance creation and management of employees. Therefore, in order to lower the turnover intention of hotel cooks, research on the determinants of employee job satisfaction and organizational commitment is urgently required. 본 연구는 호텔조리종사원의 내부마케팅이 직무만족, 조직몰입, 이직의도에 미치는 영향을 밝혀내기 위해 서울특별시에서 특급호텔 조리종사원을 대상으로 실증분석을 시행하였다. 설문은 2022년 1월 1일부터 1월 30일까지 실시하였으며, 총 300부의 설문지를 배포하여 258부가 분석에 사용되었다. 분석결과 호텔조리종사원의 내부마케팅은 직무만족, 조직몰입, 이직의도 간에는 유의한 정(+)의 영향을 미치는 것으로 나타났으며, 직무만족과 조직몰입은 내부마케팅과 이직의도 관계에서 모두 매개효과를 나타내는 것으로 분석되었다. 따라서 호텔조리종사원의 이직의도를 낮추기 위해서는 종사원들의 직무만족과, 조직몰입을 높이는 것에 대한 결정요인에 관한 연구가 절실히 요구되며 특히, 호텔의 시장상황에 중점을 두고 이루어진 정책적 관심과 연구는 호텔조리종사원들의 실질적인 성과창출과 경영에 반영하는 방향으로 확대될 필요가 있다고 하겠다.