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준희박과 농축용액에서 약간의 유연성을 갖는 막대형 고분자의 다분산성이 회전확산 과 점도에 미치는 영향
정성은,이영철,정인재 한국유변학회 1989 Korea-Australia rheology journal Vol.1 No.1
준희박과 농축용액에서 약간의 유연성을 갖는 강성막대형 고분자의 회전확산계수와 zero shear rate 점도를 예측하기 위해 한정된 강성 사슬모델이 제시되었다. 본 연구에서는 이제시된 모델을 분자량 분포를 갖는 다분산계로 확장시켰다. 분자들의 분자량 분포 (MW/Mn) 와 분포 함수를 알수 없기 때문에 해당분자에 가장 적당한 분자량 분포와 함수를 취하였다. 만약 이것들을 알고 있다면 제시된 모델로 회전확산계수와 zero shear rate 점도 등과 같은 인자들을예측할수 있었다. 단분산계의 경우와 같이 다분산계에서도 회전확산계수 의 평균분자 윤곽길이 의존도는 L-7 에 비례하는 것으로 나타났다. Doi와 Edwards 의 튜브 모델에 의한 L-9 과 다른 이유는 분자들의 거동을 관찰하기 위해 임의로 선정된 하나의 막 대형 고분자운동을 제약하는 정도가 심하지 않았으며 따라서 제약 완화시간도 훨씬 짧았기 때문이다. 더구나 점도와 회전 확산계수와 단분산계에서는 정성적으로 일치한데 제약 완화 시간도 훨씬 짧았기 때문이다. 더구나 점도와 회전적인 일치를 나타내었다. 이 모델로 기준 으로 하여 분자들의 길이와 종류에 관계없이 하나의 master curve를 그릴수 있었다.
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선봉시와 설치미술의 만남: 어우양장허(歐陽江河)⋅쉬빙(徐冰)의 ‘봉황(鳳凰)’ 해독
정성은 중국어문연구회 2022 中國語文論叢 Vol.- No.110
Xu Bing’s ‘Phoenix’ is an installation art on display in the Beijing Central Business District created by collecting 12 tons of industrial waste. In response to Xu Bing’s ‘Phoenix,’ Ouyang Jianghe created a long poem “Phoenix” to construct the intertextuality between avant-garde poetry and installation art. Ouyang Jianghe identified Xu Bing’s objet so-called ‘Phoenix’ as ‘the ruins of an old urn-like thought’ of human civilization. At the same time, various historical significances and metaphors given to the signifier of phoenix are explored through the genealogy of ‘Phoenix’ in the time spanning from ancient China to the present and contemporary times. Phoenix is a divine bird that an era of prosperity in China, but the heavy weight of Phoenix hanging from the scaffold in the form of construction waste creates an illusion of the prosperous age and makes it more difficult to fly. Both Xu Bing and Ouyang Jianghe were interested in the deconstruction of the writing system under the influence of Jacques Derrida’s différence and deconstruction theory as well as the exploration of the fabrication of East-West civilization and the exchange of civilizations. In the long poem “Phoenix,” the flight of Phoenix is acquired by a momentary sense in the difference of the language of flying (飛) and non-flying (不飛). At this time, industrial waste, a material form of Xu Bing’s Phoenix, is converted into millions of diamonds and revived as a freely flying Phoenix. Phoenix by Xu Bing and Ouyang Jianghe is a ‘symbol’ representing China and a kind of ‘device’ for recognizing the self and the world. The two Phoenixes pose an astronomical question to the world about the current crisis of humankind and its complexity, such as the global crisis, human civilization, the low-level perception of workers and the environmental and economic problems of industrial waste. Moreover, the answer to this question will work as a play of various metaphors and signifiers between waste (廢 Fèi) and flying (飛 Fēi) according to the spatiotemporal background of Phoenix and the viewing style of the observer.
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정성은,양석진,전용순,이성철,박귀원,김우기,Jung, Sung-Eun,Yang, Sook-Jin,Chun, Yong-Soon,Lee, Soong-Cheol,Park, Kwi-Won,Kim, Woo-Ki 대한소아외과학회 1996 소아외과 Vol.2 No.2
Spontaneous gastric perforation is an important but rare cause of gastrointestinal perforation in neonates. Just over 200 cases have been reported in the literatures. In spite of recent surgical advances in its managements, mortality rate has been reported as high as 25-50%. Because of physiologic differences, immature immune mechanisms, variations in gastrointestinal flora and poor localization of perforation, a neonate with gastric perforation is at high risk. The pathogenesis is greatly debated. Five patients with spontaneous neonatal gastric perforation who were operated upon at the Department of Pediatric Surgery, Seoul National University Hospital from 1980 to 1993 were reviewed. Four patients were male and one female. The first indication of perforation was 1 day to 6 days of life. All of 5 perforations were located along the greater curvature of the stomach. The size of perforation ranged from 2 cm to 10 cm. Debridement and primary closure were performed in all patients. The operative mortality was 40%(2 of 5). The cause of perforation was not identified in all cases. Prematurity and necrotizing enterocolitis, synchronous or metachronous, were thought to he crucial prognostic factors. Earlier recognition and surgical intervention are necessary to reduce morbidity and mortality.
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정성은,김대연,이성철,박귀원,김우기,Jung, Sung-Eun,Kim, Dae-Yeon,Lee, Seong-Cheol,Park, Kwi-Won,Kim, Woo-Ki 대한소아외과학회 1998 소아외과 Vol.4 No.2
The association of congenital colonic atresia with imperforate anus is extremely rare. There are only three cases reported in the English literatures. The authors have recently managed one case in female infant.
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신경능선 성장장애 (Neurocristopathy)로 생긴 선천성 중추성 저환기 증후군, 허쉬슈프렁병, 신경절모세포종 동반 1예
정성은,김대연,김기홍,이성철,박귀원,김우기,Jung, Sung-Eun,Kim, Dae-Yeon,Kim, Ki-Hong,Lee, Seong-Cheol,Park, Kwi-Won,Kim, Woo-Ki 대한소아외과학회 1999 소아외과 Vol.5 No.2
Neurocristopathy originates from aberrant development of the neural crest by genetic abnormality. Dysgenetic or neoplastic neurocristopathy mayor may not combine at one or more organs. Congenital central hypoventilation syndrome (Ondine's curse) is characterized by the respiratory depression during sleep, although showing normal ventilation while awake, because the baby does not responde to hypercapnea or hypoxia. One newborn girl, full-term, 3,020 g of birth weight with neurocristopathy is reported. It showed poor respiration at birth, and temporary Improvement with oxygen and respiratory stimulations. Abdomen was distended. Abdominal x-ray revealed small bowel obstruction and calcified opacity at the right lower quadrant. Because transitional zone was noticed at the distal jejunum during laparotomy, jejunostomy was performed. Several times trial of extubation have failed becaused of the repeated apneas. Brain sonography and echocardiogram were normal. The patient died of sepsis at 37 days of age. Para-aortic ganglioneuroblastoma was found at autopsy. In this case, congenital central hypoventilation syndrome, Hirschsprung's disease and congenital ganglioneuroblastoma are combined as a neurocristopathy.
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정성은,김대연,심인보,이성철,박귀원,김우기,Jung, Sung-Eun,Kim, Dae-Yeon,Shim, In-Bo,Lee, Seong-Cheol,Park, Kwi-Won,Kim, Woo-Ki 대한소아외과학회 1998 소아외과 Vol.4 No.2
Lymphangioma is a congenital malformation of the lymphatic system that expands into the surrounding tissues in a manner similar to a malignant tumor. Surgical excision has been the treatment of choice, but the results are often unsatisfactory due to incomplete resection, fluid collection and recurrences. Intralesional injection of OK-432(lyophilized incubation mixture of Group A Streptococcus pyogenes of human origin) was employed in treating 24 patients with lymphangiomas between 1992 and 1997. The method was used in 21 patients as a primary therapy, and in 3 patients for unresectable or recurrent cases as a secondary treatment. The results were excellent in 8 patients (33.3%), good in 7 patients (21.8 %) and poor in 7 patients (21.8 %). The side effects were fever under $39^{\circ}C$ and local inflammation. However these symptoms subsided in a few days without serious sequelae. These results suggest that intralesional injection of OK-432 is safe and effective treatment for primary lymphangioma as well as a secondary therapy for unresectable or recurrent cases.
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정성은,채순용,김선봉,이형철 한국연초학회 1996 한국연초학회지 Vol.18 No.1
A storage protein(SP-2) was confirmed in haemolymph during larval-pupal-adult development of tobacco burdworm(Helicoverpa assulta Guenee), and its biochemical characteristics were investigated. The titer of SP-2 showed a peak at mature larva, decreased gradually through the late pupal stage, and became undetectable at adult period. As the results from electrophoretic mnysis, SP-2 was confirmed to be glycolipoprotein(M.W. 332kDa) relatively stable to heat( $\leq$ 68$^{\circ}C$ ). This storage protein was determined to be a tetramer composed of a single subunit with MW of 83kDa, and the isoelectric point was 5.7. The amino acid composition of the SP-2 was characterized. It has relatively high content of methionine and histidine, whereas the contents of tyrosine and phenylalanine were relatively low.
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