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Simple Approach to the Mechanical Anisotropy of Cold-Rolled Zirconium Alloys
정양일,이명호,박정용,정용환 대한금속·재료학회 2009 METALS AND MATERIALS International Vol.15 No.5
The anisotropy for the mechanical properties of Zr was revisited using the developed modeling approach based on the physical constraints of the hexagonal close-packed lattice structure. The current approach successfully reproduced the anisotropy for the mechanical properties depending on the cold-rolling directions. It is suggested that the reversing behavior of the tensile strength and the yield strength with respect to the rolling and transverse directions is highly correlated with the structural characteristics of the hexagonal closepacked lattice. The anisotropy for the mechanical properties of Zr was revisited using the developed modeling approach based on the physical constraints of the hexagonal close-packed lattice structure. The current approach successfully reproduced the anisotropy for the mechanical properties depending on the cold-rolling directions. It is suggested that the reversing behavior of the tensile strength and the yield strength with respect to the rolling and transverse directions is highly correlated with the structural characteristics of the hexagonal closepacked lattice.
한국 제조기업의 인터넷 상거래 활용특성 : 무역업무에의 적용을 중심으로
정양일 大田産業大學校 1999 한밭대학교 논문집 Vol.16 No.1
The purpose of this study is to define the Internet trade and to investigate the usage characteristics of Internet Trade. Internet trade is the strategic use of Internet for doing export and import business. Electronic Commerce is now considered not only as the communication tools, but as the economic activity. With the development of the Internet technology, the international trade forms have been changed dramatically. Internet and EC are becoming an important new international trade forms which people can exchange information and data freely with international trading partners. Although internet is not popular in Korean companies, it has the possibility to be widely used in the future and that the increasing tendency of internet user in domestic and foreign regions will increase the adding-value capability of Internet networking, which makes the future of internet trade to be great and wonderful.
Effect of Preceramic and Zr Coating on Impregnation Behaviors of SiC Ceramic Composite
정양일,김선한,김현길,박정용,구양현 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.1
SiC fiber-reinforced ceramic composites were fabricated using a polymer impregnation and pyrolysis process. To develop the low temperature process, the pyrolysis was conducted at 600 °C in air. Both a microstructuralobservation and a mechanical test were utilized for the evaluation of the impregnation. For the impregnation,two kinds of polycarbosilane having a different degree of cross-linking were used. The level of cross-linking affectedthe ceramic yield of the composites. The cross-linking under oxygen containing atmosphere resulted in a densematrix and high density of filling. However, tight bonding between the matrix and fibers in the fully densecomposite samples, which was obtained using a cross-linking agent of divinylbenzene, turned out to bedeteriorative on the mechanical properties. The physical isolation of fibers from matrix phase in the compositeswas very important to attain a mechanical ductility. The brittle fracture was alleviated by introducing an interphasecoating with metallic Zr. The combination of forming the dense matrix and interphase coating should be anecessary condition for the SiCf/SiC fiber-reinforce composite, and it is practicable by controlling the processparameters.
서비스 접점에서 전반적 서비스 품질에 영향을 미치는 결정요인에 관한 연구
정양일 한밭대학교 산업과학기술연구소 2001 논문집 Vol.5 No.-
For consumers, evaluation of a service firm often depends on evaluation of service encounter or the period of time when the customer interacts directly with the firm. That is to say, the quality of service depends on the moment of truth which means the encounter point of service provider and consumer. The main purpose of this study is to ascertain the role of personalization between consumer and service provider and the effect of physical environment influencing on overall service quality in service encounter, to test the significance of the relationships between overall service quality, customer satisfaction, and repurchase intentions. The results of this study are as follows: First, the personalization and the physical environment in service encounter was found to be positively related with evaluation of overall service quality. Second, the result suggests that overall service quality be an antecedent of customer satisfaction. Third, the analysis of the LISREL estimates suggests that the relationships between overall service quality, customer satisfaction, and repurchase intentions have a significant effect. Implications for managers and future research are discussed.