http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
공급 사슬 환경에서 중소 제조 기업의 가격 결정 전략에 관한 연구
황승준,김태영,금병찬 한국산업경영시스템학회 2010 한국산업경영시스템학회 학술대회 Vol.2010 No.춘계
본 논문은 공급 사슬 환경에서 중간 부품을 제조하여 기업을 대상으로 판매하는 중소 제조 기업의 가격 결정 전략에 대하여 연구하였다. 특히 국내에서 자동차 부품을 제조하는 중소 기업들이 고객사에게 중간 부품을 생산하여 납품하면, 고객사가 다시 이 부품을 활용하여 그 다음 단계의 부품을 생산하여 완성차 제조업체에 납품하는 공급 사슬 환경을 고려하였다. 중소 제조 기업이 생산한 부품의 완성차 탑재 여부는 완성차를 생산하는 대기업과 협상하고, 납품 가격은 해당 부품을 구매하는 고객사와의 협상에 의해 결정된다. 본 논문은 이와 같은 환경에서 중소 제조 기업이 최적의 가격 결정을 위하여 취할 수 있는 전략 수립을 연구하였다.
황승준,이재원,김승후,주석중,이병욱,임이랑,윤혜주,이상권,송현,조원철 연세대학교의과대학 2011 Yonsei medical journal Vol.52 No.2
Purpose: The present study was aimed to assess the feasibility of using decellularized aortic allograft in a rat small animal surgical model for conducting small diameter vascular tissue engineering research. Materials and Methods: Decellularized aortic allografts were infra-renally implanted in 12 Sprague-Dawley (SD) adult rats. The conduits were harvested at 2 (n = 6) and 8 weeks (n = 6), and assessed by hematoxylin and eosin (H&E), van Gieson, Masson Trichrome staining, and immunohistochemistry for von Willebrand factor, CD 31^+, and actin. Results: Consistent, predictable, and reproducible results were produced by means of a standardized surgical procedure. All animals survived without major complications. Inflammatory immune reaction was minimal, and there was no evidence of aneurysmal degeneration or rupture of the decellularized vascular implants. However, the aortic wall appeared thinner and the elastic fibers in the medial layer showed decreased undulation compared to the normal aorta. There was also minimal cellular repopulation of the vascular media. The remodeling appeared progressive from 2 to 8 weeks with increased intimal thickening and accumulation of both collagen and cells staining for actin. Although the endothelial like cells appeared largely confluent at 8 weeks, they were not as concentrated in appearance as in the normal aorta. Conclusion: The results showed the present rat animal model using decellularized vascular allograft implants to be a potentially durable and effective experimental platform for conducting further research on small diameter vascular tissue engineering.
Effects of age and gender on spatial orientation of human corpus callosum in healthy Koreans
황승준,박찬,홍혜남,류지연,박인성,유임주 한국통합생물학회 2011 Animal cells and systems Vol.15 No.4
The changes in the corpus callosum (CC) with age and gender remain largely subject to dispute, which might come from the different strategies for analyzing the size and shape of CC. We have investigated this issue by measuring some variables reflecting the spatial orientation of CC on magnetic resonance imaging in Koreans, which minimize individual variances in the brain. The subjects were composed of young adults in their twenties (51 male, 59 female)and elderly adults in their sixties and seventies (60 male, 71 female). The total area of CC, length and height of CC,the central angle and the four angles suggested by Oka et al. were measured. The whole area and the central angle of CC were not significantly affected by age and gender. The height and length of CC were significantly greater in elderly people. The angle connecting genu, upper notch of pons and splenium was significantly larger in the elderly group. Furthermore, all four angles were significantly different between male and female subjects. These results confirm that the spatial orientation of CC is influenced by age and gender.
황승준,강혜준,김정오,정재필 한국마이크로전자및패키징학회 2019 마이크로전자 및 패키징학회지 Vol.26 No.3
In this paper, the principles, types and characteristics of the laser and laser soldering are introduced. Laser soldering methods for electronics, metals, semiconductors are also presented. Laser soldering is a non-contact process that transfers energy to solder joint by a precisely controlled beam. Demands for laser soldering are increasing due to bonding for complex circuits and local heating in micro joint. Laser absorption ratio depends on materials, and each material has different absorption or reflectivity of the laser beam, which requires fine adjustment of the laser beam. Laser types and operating conditions are also important factors for laser soldering performance. In this paper, the performance of Nd:YAG laser soldering is compared to the hot blast reflow. Meanwhile, a diode laser gives different wavelength and smaller parts with high performance, but it has various reliability issues such as heat loss, high power, and cooling technology. These issues need to be improved in the future, and further studies for laser micro-joining and soldering are required.