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정환영 한국사진지리학회 2019 한국사진지리학회지 Vol.29 No.3
본 연구에서는 2000년과 2015년 인구센서스 통근⋅통학 마이크로 데이터를 활용하여 도시 위계에 따른 충청지역의 도시세력권을 분석하고자 하였다. 2000년과 2015년 충청지역의 도시시스템을 분석한 결과 전체적인 틀은변함이 없었으나, 대전광역시보다 청주시가 상대적으로 확장되는 경향을 보이고 있고, 천안, 아산시 등 충남 서북부도시의 위상이 강화되고 있음을 알 수 있다. 외부통근율의 변화를 살펴보면, 대전, 청주, 천안 등의 대도시와 이격되어 있는 지역에서 외부통근율이 낮게 나타나고 있다. 통⋅근학에 의한 도시세력권의 변화를 분석한 결과, 대전광역시는 2000년에는 반경 30km 내외였던 것이 2015년에는 반경 50km 내외로, 청주시는 반경 20-30km에서 반경40km 정도 범위까지, 천안시는 반경 15km에서 반경 35km 정도 범위까지 확대되었다. 세종시의 인구는 급격하게늘고 있으나, 도시계층의 형성은 아직 미약한 단계라고 할 수 있다. 향후 세종특별자치시의 도시기능 확충과 도시위상의 변화에 따라 대전-세종-청주로 이어지는 삼각 거대도시권의 형성이 예상된다.
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Gold-thioglucose가 흰쥐의 시상하 식욕중추에 미치는 조직학적 변화에 대한 연구
정환영 대한신경외과학회 1975 Journal of Korean neurosurgical society Vol.4 No.2
Two hypothalamic centers are involved in the regulation of food intake; these are the posterior part of the lateral hypothalamic area (feeding center) and the medial part of the hypothalamus, mainly the ventromedial nucleus (satiety center). Recent studies showed that administrtaion of gold-thioglucose led to the development of hyperphagia and obesity in mice, and these resulted from the histological damage to the satiety center. This study was performed to confirm the findings of the previous works and to make reference material for the further study to reveal whether or not similiar tissue changes occur after administration of some Korean tonics. Materials and Methods: A total of 66 albino mice of both sexes were used; 12 out of 66 were fed as contrast group, 54 were subjected to intraperitoneal injection of a single dose of gold-thioglucose varing from 600 to 800㎎/㎏. All the mice were fed for 8 weeks until sacrificed. Results: 26 out of the 54 injected group were survived after the injection until 8 weeks later, and 8 out of the 26 survivals developed hyperphagia and obesity ranging 1.5∼2 folds increase in the body weight. Autopsy findings of the obese group demonstrated big body shape and the excess subcutaneous and intraperitoneal fat. Microscopically, there was an obvious decrease in the number of cells and the ventromedial nucleus was hardly made out as a discrete nuclear mass, meaning destruction of the satiety center. It is evident that the obesity in the gold-thioglucose-injected group in comparison with the contrast was resulted from gold-thioglucose damage to the satiety center.
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인삼이 식욕중추의 조직구조에 미치는 영향에 대한 실험적 연구
정환영 대한신경외과학회 1976 Journal of Korean neurosurgical society Vol.5 No.1
Tremendous studies have been accumulated on the tonic effects of the ginseng to date. They are temporary effects on the heart, blood, kidney, liver, spleen etc. during the ginseng-administered period. After this period, however, these transient effects were completely abolished soon or later. Time-honored continuous tonic effects of ginseng remained mystic. In 1975, author reaffirmed histological changes on the ventromedial nuclei the appetite center resulting voracious appetite and weight-gain in gold-thioglucoseinjected mice. It was evident that "the irreversible tissue changes" could explain "continuous" effects on the appetite and weight-gain. This study was performed to observe whether ginseng evokes histological change on the appetite center of the hypothalamus or not. Materials and Method : A total of 53 albino mice of both sexes were fed with commercial rodent feed; 12 out of 53 were fed conastrast group, 13 were fed adding 1% of ginseng powder for 4 weeks; 14, 2% and the other 14, 4% respectively. All of experimental groups were fed with rodent feed not containing ginseng for further 8 weeks until sacrificed. Results : Group fed roden feed with 2% ginseng powder showed weight-gain in comparition with the other groups. The difference of body weight, however, gradually decrased and became slight at the end of 8 weeks. Macro-ad microscopically, there was no significant hostological change between the each group although some questionable increase or decrease of diffuse hypothalamic cell groups including both feeding and satiety centers. Conclusion: The significant histological change did not develop on the appetite center with administration of the ginseng powder for 4 weeks in the mice.
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정환영,Chung, Hwan-Yung 대한미세수술학회 1999 Archives of reconstructive microsurgery Vol.8 No.1
Surgical treatment was performed on the 39 cases out of 76 cases of entrapments of the thoracic outlet. The remaining 36 cases of entrapments were treated by conservatively. The operated cases were categorized as follows. They were 34 cases of scalenus anticus syndrome, 1 of cervical rib syndrome, 2 of costoclavicular syndrome, and 2 of hyperabduction syndrome. 1. Scalenus anticus syndrome : Anterior scalenotomy was performed by simple sectioning of the attachment to the first rib. 2. Cervical rib syndrome : Complete decompressive resection of cervical rib sometimes required both anterior and posterior approaches to avoid over-retraction of the brachial plexus. 3. Costoclavicular syndrome : Partial decompressive claviculectomy was undergone instead of conventional total claviculectomy. 4. Hyperabduction syndrome : The resection of coracoid process was performed as well as conventional tenotomy of pectoralis minor muscle to insure free up-and-down moving of neurovascular bundle at the time of hyperabduction. Every diagnostic maneuver was tested at the time of operation to observe whether or not neurovascular decompression including restoration of radial pulse was sufficient. Despite of the postoperative vascular restoration was inmediate, neurogenic symptoms were improved slowly. Because this entity is essentially chronic nerve injnry, its recovery needed a couple of months or several. Although improvement was slow, ultimate results were definite. Complication was not observed.
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