http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
리빙라디칼 중합법을 포함한 화학적 방법에 의한 고무의 개질
주상일 ( Sang Il Joo ),조현철 ( Hyun Chul Cho ),이상훈 ( Seong Hoon Lee ),홍성철 ( Sung Chul Hong ) 韓國고무學會 2009 엘라스토머 및 콤포지트 Vol.44 No.2
고무는 천연 고무를 비롯하여 부타디엔 고무, 스티렌-부타디엔 고무, 니트릴-부타디엔 고무, EPDM, 염소화 고무 등 산업적 요구에 따라 발전하여 왔다. 광범위한 분야에서 고무가 사용됨에 따라 새로운 물성을 갖는 합성 고무나 개질 고무의 생산이 필요하게 되었다. 본 리뷰 논문에서는 이중 결합을 포함하는 고무의 화학적 개질을 통하여 고무의 구조를 변화시키거나, 관능기, 이종 고분자 등을 도입하는 몇 가지 방법들에 대하여 정리해 보고자 한다. 특히, 최근에 많은 응용이 시도되고 있는 리빙 라디칼 중합법에 의한 고무의 개질을 소개하고 이의 효과를 알아보고자 한다. Rubbers, such as natural rubber, polybutadiene, styrene-butadiene rubber, nitrile-butadiene rubber, chlorinated rubber and EPDM, have been continuously improved in response to a heavy demand and a new property requirement from industry. One of the best ways to realize the improvement is the modification of rubbers through chemical reactions, which produce materials with novel properties. In this review, chemical modification reactions of rubbers that contain carbon-carbon double bond units either in their main backbone or as a side group were briefly summarized. The chemical reactions introduce functional groups or functional polymer chains to polymer backbone, which transform a classical rubber to a highly functional material. Especially, we focused on a controlled/"living" radical polymerization techniques, with which a revolutionary broadening of the spectrum of the materials with well defined molecular weight, molecular weight distribution, chain end-functionality and architectures become possible.
주상열(Sang-Yeorl Joo),김정일(Jung-Il Kim) 강원대학교 기초과학연구소 1987 기초과학연구 Vol.4 No.-
Hader 와 Park(1978) 이 제안한 기울기회전성개념과 유사한 성질을 혼합물 실험계획에 대한 Scheffe의 2차다항식 모형을 가정하여 찾았다. 모든 방향으로서의 기울기추정량들의 분산을 평균할 때 중심점에서 같은 거리에 있는 점들에 대하여 상수가 되도록 할 수 있다. 이 성질을 모든 방향으로의 기울기 회전성이라고 부르고한 실험계획이 이 성질을 갖도록 하는 필요충분조건을 보였다. An analog of the slope rotatability suggested by Hader and Park(1978) for the second degree Scheffe polynomial model in quariables for mixture designs is presented. If we average the variance over all possible directions in a (q-1)-dimensional simplex, then the averaged variance can be constant for all points of the (q-1)-dimensional simplex equidistant from the center point. This property is called ""slope rotatability over all possible directions in a simplex"", and the necessary and sufficient conditions for an experimetal design to have this property are given.
김정일,주상열 강원대학교 정보통신연구소 2001 정보통신논문지 Vol.5 No.-
This paper describes a mechanism of applying statistical methods via multimedia through the world wide web. The popularization of the Internet provides researchers with an easier means for obtaining information via statistical methods. A paradigm of statistical analysis system, WingStat, is discussed and a demonstration is available on-line on the Internet.
담도암 환자에서 담도경적 조직 검사 결과에 영향을 미치는 인자
김명환,박주상,이성구,서동완,민영일,주연호 대한소화기내시경학회 2001 Clinical Endoscopy Vol.22 No.3
Background/Aims: This study analyzed the factors associated with the yield of percutaneous transhepatic cholangioscopic biopsies in patients with bile duct cancer. Methods: One hundred and sixteen patients who had received percutaneous transhepatic cholangioscopy and who had been confirmed as having bile duct cancer were enrolled in this study. Results: When the location of the tumor was divided into intrahepatic (IHD), hilar and common bile duct, the biopsy yield was significantly higher in IHD cancer (93.7%) than in cases of hilar cancer (69.6%) (p$lt;0,05). After a bile duct cancer had been classified as a nodular (n=31), papillary (n=27) or infiltrative type (n=58) upon cholangioscopic findings, the biopsy yields from nodular (96.8%) or papillary types (96,3%) were significantly higher than from infiltrative types (58.6%; p$lt;0.01). However, cholangioscopic classification of bile duct cancer was the only independent factor affecting biopsy yield by multiple logistic regression analysis (p=0,001). The sensitivity of the combination of cholangioscopic biopsy and tumor vessel in overall bile duct cancer, especially in the infiltrative type, was significantly increased when it was compared with that for cholangioscopic biopsies (p$lt;0.01) or for tumor vessels alone (p$lt;0,01). Conclusions: The cholangioscopic classification of bile duct tumors might provide important clues to predict biopsy yield.
담석 환자에서 Apolipoprotein E 유전자 다형성과 담석 및 담즙 내 콜레스테롤과의 관계
김명환,박주상,박광민,이성구,서동완,이승규,민영일,이영주,유교상,민원기,전사일 대한소화기학회 2000 대한소화기학회지 Vol.35 No.4
Background/Aims: Apolipoprotein E4 (apo E4) has been reported to be a risk factor for cholesterol gallstone formation. As a cause of cholesterol gallstone formation, increased hepatic uptake of cholesterol absorbed from intestine and enhanced biliary cholesterol secretion in patients carrying apo E4 genotype have been suggested, but there is little direct evidence supporting cholesterol supersaturation in the bile. Furthermore, it is unclear whether apo E polymorphism is associated with intrahepatic duct (IHD) stone formation. We performed this study to elucidate the relationship between apo E genotypes and the cholesterol content of bile and stones in patients with gallbladder (GB) stones or IHD stones. Methods: Fourty-seven patients with GB stones and 43 patients with IHD stones were enrolled in this study. Apo E genotype, bile composition and stone composition were analyzed. Results: Apo E genotypes and cholesterol content of stones were not significantly different between the patients with GB stone and the patients with IHD stone. The bile composition and cholesterol content of gallstone in the patients showed no significant difference according to apo E genotypes. Conclusions: Apo E4 genotype is not associated with an enhanced biliary cholesterol secretion and high cholesterol content in GB or IHD stones.
이성구,김명환,서동완,박주상,민영일,주연호,강경훈 대한소화기내시경학회 2000 Clinical Endoscopy Vol.21 No.4
Background/Aims: The technique of cholangioscopy has been used in the treatment of bile duct stones or for the diagnosis of various bile duct tumors. However, the cholangioscopic characteristics of the various types of bile duct tumors have not yet been clearly described. Therefore, we analyzed the results of our cholangioscopic examinations and classified the cholangioscopic findings according to tumor histology. Methods: The cholangioscopic finding from 111 patients who had benign or malignant bile duct tumors were reviewed. The mucosal changes, the presence of neovascularization, and the patterns of luminal narrowing were analyzed and compared with the histologic diagnosis, Results: Bile duct adenocarcinoma can be classified into three different types according to the cholangioscopic findings: nodular, papillary, and infiltrative. Bile duct adenoma, hepatocellular carcinoma and other types of bile duct cancer such as mucin-hypersecreting cholangiocarcinoma, biliary cystadenocarcinoma, squamous cell carcinoma also presented with their unique cholangioscopic characteristics. Conclusions: Bile duct tumors seem to show characteristic cholangioscopic findings according to their histology. Cholangioscopic examination seems to be a useful technique in the differential diagnosis of bile duct tumors.