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가스분무법에 의한 Fe계 비정질 분말의 제조와 볼밀링공정에 의한 연질 Cu분말과의 복합화 및 SPS 거동 (II) - II. 복합분말의 SPS와 특성 -
김진천,김지순,김휘준,김정곤,Kim, Jin-Chun,Kim, Ji-Soon,Kim, H.J.,Kim, Jeong-Gon 한국분말야금학회 2009 한국분말재료학회지 (KPMI) Vol.16 No.5
Fe based (Fe$_{68.2}$C$_{5.9}$Si$_{3.5}$B$_{6.7}$P$_{9.6}$Cr$_{2.1}$Mo$_{2.0}$Al$_{2.0}$) amorphous powder, which is a composition of iron blast cast slag, were produced by a gas atomization process, and sequently mixed with ductile Cu powder by a mechanical ball milling process. The Fe-based amorphous powders and the Fe-Cu composite powders were compacted by a spark plasma sintering (SPS) process. Densification of the Fe amorphous-Cu composited powders by spark plasma sintering of was occurred through a plastic deformation of the each amorphous powder and Cu phase. The SPS samples milled by AGO-2 under 500 rpm had the best homogeneity of Cu phase and showed the smallest Cu pool size. Micro-Vickers hardness of the as-SPSed specimens was changed with the milling processes.
연질 Cu 분말-가스분무 Ni계 벌크 비정질 복합분말의 방전플라즈마 소결에 관한 연구
김진천,김용진,김병기,김지순,Kim, Jin-Chun,Kim, Yong-Jin,Kim, Byoung-Kee,Kim, Ji-Soon 한국분말야금학회 2006 한국분말재료학회지 (KPMI) Vol.13 No.5
Ni based($Ni_{57}Zr_{20}Ti_{18}Si_2Sn_3$) bulk metallic glass(BMG) powders were produced by a gas atomization process, and ductile Cu powders were mixed using a spray drying process. The Ni-based amorphous powder and Cu mixed Ni composite powders were compacted by a spark plasma sintering (SPS) processes into cylindrical shape. The relative density varied with the used SPS mold materials such as graphite, hardened steel and WC-Co hard metal. The relative density increased from 87% to 98% when the sintering temperature increased up to $460^{\circ}C$ in the WC-Co hard metal mold.
김진천,이한일,김영민,유창식,공경엽,이강홍 대한소화기학회 1998 대한소화기학회지 Vol.30 No.2
Background/Aims: Angiogenesis is needed for tumor growth and metastasis. The proliferating endothelial cells may secrete growth factor that stimulate tumor growth. Their porous basement membranes may be a port of entry by cancer cell. The purpose of this study was to find out relationship between angiogenesis degree and growth or recurrence of colon cancer. Methods: Immunohistochemical staining by monoclonal IgG1 antibody to factor VIII related antigen was made using archival tissue of curatively resected 97 Dukes B & C colon cancer patients. Rectal and hereditary colon cancer patients were excluded for standardization of recurrence. Angiogenesis score was defined as a mean of 3 separate light microscopic field(x 200) by two pathologists. Median follow-up period was 42 months. Results: Mean angiogenesis score was 21.7(14-34). There was no difference between angiogenesis score and tumor size, Dukes stage, differentiation and preoperative CEA level. Overall recurrence was not affected by angiogenesis score. Confining to stage Dukes B, angiogenesis score of recurrence group should be 24.8, while non-recurrence group 20.5(p=0.006). In Dukes C stage, there was no difference(recurrence group: 21.2, non-recurrence group: 22.5). A significant difference was also found between recurrence patterns of Dukes B(non-recurrence group: 20.5, locoregional recurrence group: 25.7, systemic recurrence group: 24.3)(p=0.02). Five year survival rates were 91% in low angiogenesis score(≤22) group and 74% in high angiogenesis score($gt;22) group. However, there was no statistical difference. Comparing the survival rate in Dukes B stage only, high angiogenesis score group showed poor 5 year survival rate(68% vs 100%, p=0.04). Conclusions: In node negative colon cancer, angiogenesis degree may be an independent prognostic factor and selective use of adjuvant therapy may validate in patients with high angiogenesis score.