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박진석,유창식,김찬욱,정광용,신의섭,윤상남,임석병,김진천 대한대장항문학회 2009 Annals of Coloproctolgy Vol.25 No.4
Purpose: We aimed to compare the prognosis and the recurrence patterns of sporadic primary colon cancers according to the location of the cancer. Methods: One thousand four-hundred eighty-three (1,483) stage II, III colon cancer patients who had undergone a consecutive curative resection between January 1989 and December 2003 were analyzed. Hereditary, synchronous, metachronous, and recurrent colon cancers were excluded. The right colon was defined as being from the cecum to the transverse colon, and the left colon was defined as being from the splenic flexure colon to the rectosigmoid colon. The median follow-up time was 63 (3-228) mo. Results: Poorly differentiated and mucinous cell type tumors were more frequent in the right colon. T3 tumors were more frequent in the right colon. Lymph-node-positive tumors were more frequent in the left colon. The recurrence rate was higher in the left colon, but the patterns of recurrence were not different according to the tumor’s location. By univariate analysis, age, preoperative serum CEA level, T-stage, N-stage, lymphovascular invasion, postoperative chemotherapy, and tumor location were significant prognostic factors associated with recurrence. By multivariate analysis, sex, preoperative serum CEA level, T-stage, N-stage, postoperative chemotherapy, and tumor location were significant prognostic factors associated with recurrence. The 5-yr disease-free survival rates were 84.0% for right colon cancer and 77.1% for left colon cancer (P= 0.005). The recurrence rates for cancers in the sigmoid colon and the rectosigmoid colon were higher than those for cancers in the cecum and the ascending colon. Conclusion: The tumor’s location was an independent prognostic factor for recurrence, but the pattern of recurrence did not vary with the tumor’s location. Purpose: We aimed to compare the prognosis and the recurrence patterns of sporadic primary colon cancers according to the location of the cancer. Methods: One thousand four-hundred eighty-three (1,483) stage II, III colon cancer patients who had undergone a consecutive curative resection between January 1989 and December 2003 were analyzed. Hereditary, synchronous, metachronous, and recurrent colon cancers were excluded. The right colon was defined as being from the cecum to the transverse colon, and the left colon was defined as being from the splenic flexure colon to the rectosigmoid colon. The median follow-up time was 63 (3-228) mo. Results: Poorly differentiated and mucinous cell type tumors were more frequent in the right colon. T3 tumors were more frequent in the right colon. Lymph-node-positive tumors were more frequent in the left colon. The recurrence rate was higher in the left colon, but the patterns of recurrence were not different according to the tumor’s location. By univariate analysis, age, preoperative serum CEA level, T-stage, N-stage, lymphovascular invasion, postoperative chemotherapy, and tumor location were significant prognostic factors associated with recurrence. By multivariate analysis, sex, preoperative serum CEA level, T-stage, N-stage, postoperative chemotherapy, and tumor location were significant prognostic factors associated with recurrence. The 5-yr disease-free survival rates were 84.0% for right colon cancer and 77.1% for left colon cancer (P= 0.005). The recurrence rates for cancers in the sigmoid colon and the rectosigmoid colon were higher than those for cancers in the cecum and the ascending colon. Conclusion: The tumor’s location was an independent prognostic factor for recurrence, but the pattern of recurrence did not vary with the tumor’s location.
CaO-Fe_tO-SiO_2-MgO 슬래그 중 Nickel 분배거동
박진석,박경호,민동준 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.4
The solubility of nickel in molten CaO-Fe_tO-SiO_2-MgO slag system at 1723K was measured to understand the dissolution mechanism of nickel into the slag. The dependence of solubility of nickel on oxygen partial pressure and slag basicity indicated that the nickel was dissolved as an oxide ionic species NiO^2-_2 by following reaction: [Ni(s)+{1/2O_2(g)+O_2-(slag)}=NiO^2-_2] The distribution ratio of nickel increased with the increase of (X_CaO+X_MgO)/(X_SiO_2) at a fixed Fe_tO content. However, in CaO-SiO_2-Fe_tO-MgO_satd slag system , Fe_tO is considered to work as a relatively acidic component such as FeO_2 ̄at composition higher than about X_FgtO=0.25. MgO is revealed to be weaker basic oxide than CaO in CaO-SiO_2-Fe_tO-MgO_satd slag system.