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이상일,서석훈,홍경민,신용섭,장상희,신부영 영남대학교 공업기술연구소 2001 工業技術硏究所論文集 Vol.29 No.1
Bio-and-photodegradable polymer composites were prepared by blending biodegradable aliphatic polyester and photodegradable master batch(M/B). Photodegradability, biodegradability, thermal properties and mechanical properties were investigated. The biodegradability of EnPol(G4600) composites decreased wish increasing the amount of M/B, while that of EnPol(G8000) composites increased. Tensile strength and elongation decreased with increasing the time of outdoor exposure and the amount of M/B but modulus comparatively maintained. The mechenical properties decreased as the content of M/B increased, while the melting temperature unchanged.
Hun Hwee Park,Kyong Won Han,Nak June Sung,Chul Soo Kim Korean Nuclear Society 1984 Nuclear Engineering and Technology Vol.16 No.2
방사성폐기물 처분과 관련하여 산청, 온양 그리고 무안에서 채취한 국산점토에 대한 Cs-137 및 Sr-90의 흡착특성과 이들 핵종의 점토층이동에 대하여 고찰하였다. 흡착분배계수(Ksorp)를 회분식 흡착실험으로 결정한 결과 Cs-137의 경우 8,000-17,000ml/g 그리고 Sr-90의 경우 10,000-15,000m1/gr 범위의 값이었다. 이때 액상의 초기농도는 0.l$\mu$Ci/ml이었다. 산청과 온양의 점토는 흡착성능이 우수하였으나 무안의 점토는 현저하게 낮았다. 이것은 무안점토에 다량 존재하는 석영성분때문인 것으로 생각되었다. 이상의 흡착특성을 Freundlich형의 형태로 다음과 같이 표시할 수 있었다. $C_{R}$=18.0 $C_{A}$$^{0.74}$ : Cs-137, $C_{R}$=0.84 $C_{A}$$^{0.45}$ : Sr-90. 이 관계식을 BOX모델에 적용하여 점토층내에서의 핵종이동을 모사한 결과 국산점토가 처분장의 충진제로서 효과적임을 확인하였다.하였다.하였다. With regard to the radioactive waste disposal, adsorption properties and migration rates have been evaluated for Cs-137 and Sr-90 with the domestic clay sampled from Cnyang, Sanchong and Mooan. Sorption coefficients (Ksorp) were determined by batch experiments. The measured values of Ksorp were ranged from 8000 to 17,000 ml/gr for Cs-137 of 0.1$\mu$Ci/ml, and from 10,000 to 15,000m1/gr for Sr-90 of 0.l$\mu$Ci/ml. Remarkably, Mooan clay showed lower values of Ksorp than those of the others. This could be explained by the poor soprtion capacity of the quartz found only in the Mooan clay. For the quantitative analysis, sorption isotherm equations of Freundlich type were made with the obtained values of Ksorp. $C_{R}$=18.0 $C_{A}$$^{0.74}$ : Cs-137, $C_{R}$=0.84 $C_{A}$$^{0.45}$ : Sr-90. By introducing the BOX model combined with the above relationships, simulation of underground nuclide movement was carried out. The results showed that the domestic clays could be the effective backfill material for repositories.itories.ies.
Type 3 Gastric Neuroendocrine Neoplasm Clinical Features: A Multicenter Study in Korea
Kyong Joo Lee,Hee Man Kim,Sang Kil Lee,Ho Sun Choi,Jie-Hyun Kim,Seun Ja Park,Sung Chul Park,Byung Ik Jang,Jin Tae Jung,Tae Joo Jeon,Jong Hun Lee,Jae Kyu Sung,Semi Park,Yoon Jae Kim,Jae Hee Cho Korean Society of Gastrointestinal Cancer 2017 Journal of digestive cancer reports Vol.5 No.2
Background: The aim of this study was to investigate clinicopathologic features of type 3 gastric neuroendocrine neoplasm (NEN) by treatment modality. Methods: The Korean Society of Gastrointestinal Cancer conducted the Korean Gastroenteropancreatic Neuroendocrine Tumor Registry, a retrospective registry database of gastroenteropancreatic neuroendocrine tumors from 16 hospitals in Korea. The normal serum gastrin level range was defined as <100 pg/mL, and gastric NEN patients with normal gastrin level were selected for analysis. Results: Among 358 patients with gastric NEN, 21 (5.9%) patients were classified with type 3 gastric NEN. The median age was 53 years (range 30-74). According to the WHO 2010 classification, 13 (61.9%) patients had grade 1, and 8 (38.1%) patients had grade 2 or 3. Endoscopic treatment was performed in 14 (66.7%) patients, and surgery was performed in 7 (33.3%) patients. The tumor size was smaller in the endoscopic treatment group than in the surgery group (0.6 cm vs 1.3 cm, p=0.006). After treatment, there was one recurrence in the surgery group. Conclusion: In small size Type 3 gastric NEN, endoscopic treatment was associated with a good prognosis, compared to surgery. Thus, endoscopic treatment can be used an alternative modality in selected cases of type 3 gastric NEN.
임신 오조증이 합병된 임신에서의 출생아의 성비에 관한 연구
조헌영 ( Hun Young Cho ),이정열 ( Jung Ryul Lee ),이유경 ( Yoo Kyong Lee ),구인상 ( In Sang Ku ),차진영 ( Jin Young Cha ),김승룡 ( Seung Ryong Kim ),박문일 ( Moon Il Park ),조삼현 ( Sam Hyun Cho ),정성로 ( Sung Ro Chung ),황윤영 ( 대한주산의학회 2002 Perinatology Vol.13 No.2
연구목적:임신 오조증이 합병된 임신부의 경우, 출생시 신생아의 성비가 정상산모의 그것과 차이를 보인다는 일부 보고가 있어, 본 연구에서는 임신 오조증과 출생 신생아의 성비와의 관련성 여부와 오조증의 정도에 따른 출생시 성비에 대해 조사를 시행하였다. 방법:1995년 1월부터 2000년 12월까지 한양대학병원 산부인과에서 임신 오조증으로 진단받고 입원 치료한 산모 중, 본원에서 최종 분만한 111명의 산모를 연구 대상으로 하고, 상기 질환력이 없이 만삭 분만한 1995명을 대조군으로 하여, 각 군의 신생아의 성비를 비교 하였다. 또한 임신 오조군을 그 정도에 따라 경증과 중증의 두 군으로 나누어, 각 군별 특성과 출생시의 성비에 대해 조사하였다. 자료의 통계적 처리는 student t-test와 chi-square test를 이용하였고 p-value가 0.05 이하인 경우에 임상적 의의가 있는 것으로 판단하였다. 결과:임신 오조군의 경우, 111명의 출생아의 성별은 65명이 여아(58.6%), 46명이 남아(41.4%)로서, 대조군에 비해 여아의 출생이 유의하게 높은 것으로 나타났다(p=0.0046). 한편 임신 오조증의경증군과 중증군 사이에서는 성비에서 유의한 차이를 보이지 않았다(p=0.4487). 결론:임신 오조증이 합병된 임신에서는 여아의 출생이 유의하게 많은 것으로 조사되었다. 한편, 임신 오조증과 여아 출생의 증가와의 관련 인자를 규명하기 위하여는 혈중 에스트로젠 또는 HCG 농도 등에 관한 조사를 시행할 필요가 있는 것으로 사료된다. Objectives:There are a few studies reporting difference in sex ratio at birth in pregnancies complicated with hyperemesis gravidarum but it has not been reported in domestic journals yet. The purpose of this study is to evaluate difference of sex ratio in hyperemesis gravidarum patients compared to normal pregnant women. Materials & Methods:We identified 111 women who were diagnosed as hyperemesis gravidarum and had delivered babies in Hanyang University Hospital between Jan. 1995 to Dec. 2000. The control group was 1995 women who had no obstetric problems including hyperemesis gravidarum during the pregnancy and had delivered baby at term. We compared the sex ratio of infant and the characteristics of these two groups. The study group was divided into two subgroups depending on the severity of disease, mild group and severe group, and difference of sex ratio in these group were also compared. We analyzed the data using student T-test and chi-square test and p-value<0.05 was considered as statistically significant. Results:Compared to sex ratio(female:male) of control group(44.8:55.2), hyperemesis gravidarum showed the sex ratio of 58.6:41.4(p=0.005). There was no further difference of sex ratio between two subgroups of hyperemesis gravidarum according to severity of disease. Conclusion:In pregnancies complicated with hyperemesis gravidarum the sex ratio of female was significantly high. The studies based on more variables and larger population would produce more accurate results.