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김병곤,최상근,정헌생,한상근,이재장,Kim, Byeong-Gon,Choe, Sang-Geun,Jeong, Heon-Saeng,Han, Sang-Geun,Lee, Jae-Jang 한국재료학회 2001 한국재료학회지 Vol.11 No.8
천연흑연은 단위구조가 탄소육각망평면이 평행하게 배열된 층상으로 전기전도도 및 윤활성이 우수하나 소수성이 매우 강하며, 표면화학적 목성이 거의 없기 때문에 다른 물질과 흡착이 쉽게 일어나지 않아 분산이 매우 어려운 물질이다. 따라서 본 연구에서는 제타전위를 이용하여 흑연에 ABDM을 흡착시켜 표면특성을 소수성에서 친수성으로 변화시키고 수중현탁액 중에서 흑연입자의 분산 메커니즘을 DLVO이론을 이용하여 설명하였다. 흑연의 제타전위가 22.5mV가 되도록 ABDM의 흡착량 (20mg/g) 및 조건 (PH 10에서 12시간 흡착)을 만족시키면 분산안정성 (T$_{1/2}$) 이 44.5시간인 고분산성 흑연 현탁액을 제조할 수 있다. The surface of natural graphite has not only good electrical conductivities and lubrication properties but also has strong hydrophobicity. There are no functional groups and chemical properties on it. It is difficult to join with any other ions and to disperse in aqueous system. In order to increase dispersion ability throughout modification of surface property, it is necessary to let graphite have some function on its surface by the adsorption of surfactant molecules. In this study, using zeta potential adsorbed surfactant molecules(ABDM) on graphite surface and its surface Properties turn hydrophobic into hydrophilic. The dispersing mechanism of graphite particles in aqueous system has been explained using the DLVO theory, It is concluded that the high dispersable graphite suspension of which dispersing stability$(T_{1/2})$ is 44.5 hours at pH 10 and 22.5mV zeta potential can be produced.
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선희식(Hee Sik Sun),정인식(In Sik Chung),이재학(Jai Hak Lee),주상용(Sang Yong Choo),이종서(Jong Seo Lee),장석균(Suk Kyun Chang),최상근(Sang Geun Choe),안창준(Chang Jun Ahn) 대한소화기학회 1993 대한소화기학회지 Vol.25 No.6
N/A Stomach cancer is the most common malignant tumor in Korea. This study includes 900 stomach cancer cases which were collected at the Departrnent of Surgery, St. Marys Hospital, Catholic University medical College over the period from 1980 to 1991. The patients are divided into two groups: Those treated during the period between 1980 and 1986 - first group and the period between 1987 and 1991 - second group. We followed each patient and then analysed each patient's record using guidelines from the Stomach Cancer Study Group of Korean Surgical Society. There were 889 adenocarcinomas (98.8%), 5 malignant lymphomas (0.5%), 5 leiomyosarcomas (0.5%) and 1 leiomyoblastoma (0.1%). There were 378 patients in the first group and 522 in the second group. The number of second group patients was 1.4 times as many as compared to the first group. Peak age incidence was 6th decade (32%) and male to fema]e ratio was 1.8:1. The difference about age and sex between groups was insignificant. The number of patient under 35 years old was 87 cases (9.7%), Tumor locations were antrum (62.8%), body (27.4%), cardia (5.3%) and whole stomach (3.7%). The tumor location of the second group is more proximal portion of stomach than first group. Operation procedures performed were subtotal gastrectomy (69.1%), total gastrectomy (18.7%), bypass gastrojejunostomy (4.6%), exploratory surgery (6.3%) and proximal gastrectomy (0.8%) and so gastric resection rate was 88.6%. Total gastrectomy of the second group has increased compared to first group, while exploratory surgery has decreased. Regional lymph node metastasis was seen in 60.8% of all cases. Rate of regional lymph node metastasis according to tumor depth were as follows; 16% in T1, 48.4% in T2, 77.3% in T3 and 92.5% in T4, There were 162 cases of early gastric cancer (EGC 18%): 14% in the first group, 20% in the second group. The rate of EGC has significantly increased every year (p<0.05). Overall 5-year-cummulative survival rate was 55.8%. Overall 5-year-cummulative survival rates according to stage were as follows: 98.6% in stage I a, 89.6% in I b, 67% in II, 58.4% in llIa. 29.4% lIlb and 14% in stage IV. overall 5-year-cummulative survival rates according to depth were as follow: 93.9% in Tl, 85% in T2, 48.8% in T3 and 12.4% in T4. Hospital death rate was 1.5%.
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