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이상조,김욱배 연세대학교 통일연구원 2003 통일연구 Vol.7 No.2
The technological and industrial traits of North Korean today are very different with those of South Korea as politics, economy, culture of both Koreas are, which have been developed in respective ways during the last fifty years. Facing with today's many real activities for the interchange and the cooperation like the construction of railroads and industrial complexes, lack of the general understanding of dissimilarities in characteristics of both countries are making it difficult to accomplish joint objects. However, any examination about those problems has never been tried because of the lack of practical materials and data about the technology and the industry in the North. This paper addresses the analysis procedure and method of the difference of the national industrial standard between South and North Korea in order to understand the difference. We already investigated the hierarchical classifications, organization, regulative items before and the systematic analysis procedure including the comparative study of the national standard based on the characteristics of each standard and the guide table which can be used in the comparison of the standards are accomplished in this paper. Based on the suggested comparison procedure, we reported the difference of the standard in the area of mechanical industry as a result of the comparison of the standards of South and North Korea over 360.
김원,최유성,이태양,최재곤,홍완해,조병욱 조선대학교 생산기술연구소 2003 生産技術硏究 Vol.25 No.1
This study explores the potential of improving the physical properties of poly(trimethylene terephthalate) (PTT) by inducing thermotropic liquid crystalline polymers. The TLCP was synthesized by polycondensation reaction of terephthaloyl chloride with corresponding diols. The TLCP used was copolymers containing random PTT groups on the polymer backbone. The PTT moieties were used to increse compatibility between the PTT and the TLCP. The TLCP showed the nematic phase above those melting temperature(T_m) The TLCP seems to act as plasticizers and nucleating agents in the matrix polymers Liquid crystalline phase did not reaveal any significant macrophase separation and thermal degradaton under the temperature of processing condition.
고크롬 백주철의 미세조직과 기계적 특성에 미치는 초기응고 조직의 영향
조현욱 ( Hyun Wook Jo ),도정현 ( Jeong Hyeon Do ),조원제 ( Won Je Jo ),정현득 ( Hyun Deuk Chung ),이재현 ( Je Hyun Lee ),조창용 ( Chang Yong Jo ) 한국주조공학회 2015 한국주조공학회지 Vol.35 No.6
Due to excellent abrasion resistance the high-chrome white irons are widely used in mining and mineral industries. Minor variation of carbon content in 28% chrome white iron resulted in difference in primarily solidified microstructure. Sub-eutectic (hypoeutectic) a) composition led to formation of primarily solidified dendrites. Formation of primarily solidified dendrites which were supersaturated with carbon and chrome also caused precipitation of fine secondary carbides that are different from relatively large plate type M7C3 carbides in the eutectic structure. Small portion of primarily solidified dendrite expected to contribute significantly to the improvement of abrasion resistance of the white iron because the dendrites provided mechanical support to carbides. The relative fraction of primary dendrite increased with reduction of carbon content from the eutectic composition. The increased fraction of primary dendrite increased hardness value of the white irons.