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$U_3O_8$ 종자가 $UO_2$ 핵연료 소결체의 입자성장에 미치는 영향
이영우,김동주,김건식,Rhee, Young-Woo,Kim, Dong-Joo,Kim, Keon-Sik 한국결정성장학회 2007 韓國結晶成長學會誌 Vol.17 No.2
[ $UO_2$ ] 소결체와 $U_3O_8$종자를 5wt% 첨가한 $UO_2$ 소결체의 치밀화 과정 및 입자성장 양상을 소결 온도 및 시간을 변수로 하여 분석하였다. $UO_2$ 성형체와 5wt% $U_3O_8$ 종자 첨가 성형체를 수소분위기에서 $1300^{\circ}C$에서 $1700^{\circ}C$로 온도를 올려가며 0시간에서 4시간 소결하여 밀도와 입자크기를 측정하였다. $1300^{\circ}C$까지는 종자 첨가에 상관없이 거의 같은 밀도를 가졌지만 온도가 올라가면서 종자 첨가 소결체의 치밀화가 저하되었다가 $1700^{\circ}C$ 근처에서 거의 비슷한 밀도를 가지게 된다. 입자성장의 경우, $1600^{\circ}C$에서는 종자 입자를 제외하면 기지상의 입자 크기는 거의 비슷하지만 $1700^{\circ}C$ 이후에서는 종자첨가 $UO_2$ 소결체의 입자성장이 종자가 첨가되지 않을 경우에 비하여 2배 이상 빠르게 진행되었다. Densification and grain growth have been investigated in 5 wt% $U_3O_8$ seeded $UO_2$ and compared with those of the common $UO_2$ pellet. $UO_2$ compacts and $U_3O_8$ seeded $UO_2$ compacts were sintered at $1300{\sim}1700^{\circ}C$ for 0 h to 4 h. Density and grain size of the sintered pellets were measured by the water immersion method and the image analyzer, respectively. The seeded pellet has a slightly lower density during the intermediate sintering stage. However, the difference of density between two pellets decreases to about 0.5%TD with increasing the sintering temperature. The grain size of the two pellets is similar until $1600^{\circ}C$ but that of the seeded pellet rapidly increases with increasing the sintering temperature.
이영우(Lee, Youngwoo),이진화(Rhee, Jin Hwa),신문식(Shin, Moonsik) 한국상품학회 2021 商品學硏究 Vol.39 No.4
Using cross-border M&A data, this study investigates the effects of knowledge relatedness between two merging firms, measured by technological complementarity and technological diversity, on the post-merger new product performance. In addition, it aims to find that whether the degree of integration(ownership) of M&A could either propels or restrains the knowledge transfer process in the post-merger process. Based on the resource-based view (RBV) and organization learning theory, a research model is developed utilizing key constructs of knowledge relatedness, the degree of integration, and new product performance. Subsequently, hypotheses are tested using the firms’ patent information and cross-border M&A data in high-technology industries which are collected from National Bureau of Economic Research (NBER) and Securities Data Corporation (SDC), respectively. The results indicate that technological complementarity between merging firms facilitates post-merger exploitive product development while technological diversity increases post-merger exploratory product development. Specifically, when a firm acquires a target firm with complementary resources, it induces the acquiring firm to fall into a familiarity trap, resulting in post-merger exploitative product development. The integration of diverse knowledge stock from the target firms, on the other hand, facilitates exploratory product developments. Our results also confirm that the high degree of integration is particularly beneficial for integrating complementary knowledge due to relatively high absorptive capacity, while it has no effect on knowledge exploration. In this paper, we seek to provide a holistic perspective on the determinants of post-merger new product development by allowing a deeper understanding of technological relatedness between merging firms as well as the interdependence of the pre- and post-merger phases.
강석환,이영우,강용,한근희,이창근,진경태,손재익,박영성,Kang, Suk-Hwan,Rhee, Young-Woo,Kang, Yong,Han, Keun-Hee,Yi, Chang-Keun,Jin, Gyoung-Tae,Son, Jae-Ek,Park, Yeong-Seong 한국에너지학회 1996 에너지공학 Vol.5 No.2
석탄가스화 복합발전 시스템의 주요 단위 공정인 고온건식 탈황공정에 사용되는 탈황제의 개발을 위한 연구의 일환으로 국내산 철광석과 호주산 철광석에 대해 환원, 황화 및 재생 반응을 수행하였다. 실험 장치로는 TGA와 시료 제조용 고정층 반응기를 이용하였고, BET 표면적, SEM, 탈황/재생 cycle 실험, 반응 온도 변화 및 탈황제의 질량변화곡선 등을 이용하여 세가지 철계 탈황제에 대한 기초반응 특성을 규명하였다. 500-$700^{\circ}C$ 구간에서 반응온도 증가에 따라 탈황반응의 H$_2$S 제거율과 재생반응의 재생율이 증가하였다. Reduction, sulfidation, and regeneration reactions were performed using domestic and Australian iron ore in order to develop a desulfurizing sorbent for the high temperature desulfurization process that is one of major processes in the integrated coal gasification combined cycle (IGCC) system. A TGA (Thermogravimetric Analysis) reactor and a fixed-bed reactor were used. Some basic kinetic information was obtained from BET surface area measurements, SEM photos, cyclic reactions, reaction temperature changes and TGA curves of the sorbents. The rates of both desulfurization and regeneration increased with increasing reaction temperature in the range of 500-700$^{\circ}C$.