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Properties of Poly(ethylene glycol)-Grafted Poly(lactic acid) Plasticized with Poly(ethylene glycol)
최경만,하창식,임성욱,최면천,한동훈 한국고분자학회 2014 Macromolecular Research Vol.22 No.12
Poly(lactic acid) (PLA) was grafted by a poly(ethylene glycol) (PEG) acrylate through reactive blendingmethod and consecutively blended with a low molecular weight PEG plasticizer. The grafted PEG on the PLA wasconfirmed by nuclear magnetic resonance (NMR) and Fourier transform infrared (FTIR) spectroscopy. Propertiesof the plasticized PLAs (PLEs), prepared by blending the PEG-grafted PLA (PLG) with various contents of the PEGplasticizer, were investigated using tensile testing, wide-angle X-ray diffraction (WAXD), differential scanning calorimetry(DSC), thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA), and hydrolytic degradation analysis. The tensile strength of the plasticized PLA (PLE09) was decreased by 48%, from 51.1 to 26.7 MPa, while its elongationat break increased by 24 times, from 6.5% to 158%. Thermal properties and biodegradability were also greatlyinfluenced by the hydrophilic PEG modifier.
사방지(砂防地) 식생천이(植生遷移)와 토양변화에 관한 연구(중부 화강암지대를 중심으로)
최경,최정용 한국임학회 1987 한국산림과학회지 Vol.76 No.3
砂防地의 管理指針을 提示하기 위하여 零州, 利川, 楊州, 抱川地域에서 砂防地의 植生遷移와 土壤變化 等, 現 實態를 調査한 바, 施工年次가 經過됨에 따라 다음과 같이 變化하였다. (1) 優占種 變化 施工 5年 : 오리나무類, 아까시나무, 리기다소나무 順에서 施工 10年 : 오리나무類, 리가다소나무, 소나무, 참나무類 順으로 施工 15年 : 새, 솔새, 개솔새 順에서 施工 20年 : 새, 기름새, 산기울 順으로 되었다. (2) 施工 20年이 經過하면 平均落葉尸의 깊이는 3.5㎝, 平均土深(C₃ 尸包含)은 28㎝까지 形成되있다. (3) 施工年次가 經過됨에 따라 有效燐酸含量은 減少되며, 粘土含量, 有機物含量, 置換性鹽基, 陽이온 置換容量 等은 增加되었다.
최경도 한국 헨리제임스 학회 1997 헨리 제임스 연구 Vol.- No.2
Since Aristoltle there have been a great deal of arguments over the role of plot. The plot becomes the base of the narrative--the very reason for which a narrative work exists, that is, the menas by which a narrative work conveys its meaning. As a controversial literary subject, the plot has been discussed especially in fiction since the exploration of its nature is directly related not only to the form, but to the content of fiction. An organizing and unifying principle of fiction, the plot had different meanings in the twentieth century. Many writers nowadays are using the plot in the different sense in order to enhance the effect of their work. thus the interpretation of fiction today involves the role of the plot. My aim in this article is to explore the nature of the plot in order to know that the crisis of fiction or narrative comes from the changing concept of the plot.
최경해,이부경,권혁,진기천,설상영,정정명 인제대학교 1988 仁濟醫學 Vol.9 No.4
저자들은 1981년 1월부터 1988년 6월까지 인제의대 부산백병원 내과에서 위장관계통의 평활근육종 10예를 경험하고 이들에 대한 상세한 임상적 관찰을 실시하여 그 결과를 보고하고자 한다. A clinical study was performed on 10 cases of leiomyosarcoma of the gastrointestinal system admitted to Inje Medical College, Pusan Paik Hospital, from 1981 to 1988, and the following results were obtained. 1) The locations of the leiomyosarcoma were the stomach(3 cases), the duodenum(3 cases) the jejunum(2 cases), the rectum(1 case) and the omentum(1 case), in order of frequency. The age distribution was wide from 12 years to 60 years, the most prevalent age group was fourth decade(4 cases) and the average age was 43 years. The ratio of male to female was 6 : 4, the male being 6 cases and the female 4 cases. 2) The most common symptom was gastrointestinal hemorrhage, 7 cases out of 10, and the duration of illness was variable, from 3 days to 5 years, but was loot closely related to the severity of illness. 3) The incidence of the leiomyosarcoma of the gastrointestinal system as compared with the other malignant tumor in the same period was about 0.9%, the stomach 0.3%, the small intestine 38.5%(the duofenurn 37.5%, the jejunum 40.0%), the rectum 0.8%, and the omentum 33.3%, which was consistent with other monographs. 4) All 10 cases underwent surgical intervention, postoperative chemotherapy was done on 3 cases in which the regimen was VAC(Vincristine, Adriamycin, Cyclophosphamide) and postoperative radiotherapy was done on 1 case. In brief, the leiomyosarcoma of the gastrointestinal system was most frequent in the small intestine, gastrointestinal hemorrhage the commonest clinical symptom, the duration of the illness was mainly less than 1 year, involved any age group and the overall incidence was less then 1% of the gastrointestinal malignancy.