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RISS 인기검색어
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- 저자 : 최문철(Mun-Cheol Choi) (검색결과 2 건)
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인터넷서비스의 특성과 효율적인 FTP서비스를 위한 구조
신상호(Sang-Ho Shin),최문철(Mun-Cheol Choi),안순신(Sun-shin Ahn) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.1A
인터넷에서 여러 가지 서비스를 제공하기 위해서는 서버의 확장이 요구된다. 이때 여러 서버들에게 트래픽을 분배하는 방법에 따라서 확장성과 성능에 영향을 주게 된다. 각각의 서비스들의 특성을 알아본 뒤에 트래픽 분배에 있어서 필요한 사항과 각각의 서비스에 있어서 적합한 방법을 Layer4 Switch와 관련해서 알아본다.
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방사선조사가 저칼슘식이 백서 치주조직에 미치는 영향에 관한 연구
최문철,이상래 大韓口腔顎顔面 放射線學會 1992 Imaging Science in Dentistry Vol.22 No.2
The purpose of this study was to investigate the changes of periodontal tissues in the irradiated mandibular bone in rats which were fed normal diet and low calcium diet. In order to carry out this experiment, 64 seven-week old Sprague-Dawley strain rats weighing about 150 gms were selected and equally divided into one experimental group of 32 rats and one control group with the remainder. The two groups were irradiated a single dose of 20 Gy on the only jaw area and irradiated with a cobalt-60 teletherapy unit. The rats in the control and experimental groups were serially dissected by fours on the 3rd, the 7th, the 14th, and the 21st day after irradiation., After each dissection, both sides of the dead rat mandibular bodies were removed and fixed with 10% neutral formalin. The specimens sectioned and observed in histopathological, histochemical, and immunocellular chemical methods. The obtained results were as follows ; 1. In the mandibles of rats with low calcium diet the increased number of fibroblasts of periodontal ligaments, many small capillaries and irregular arrangement of loose collagen fibers were detected and the partial resorption of dentin and cementum could be found by the microscopic studies. 2. In the group of irradiated rats, degenerated periodontal tissues led to the condition of irregular arrangement of collagen fibers and the decreased number of fibroblasts. But this condition was somewhat restored after 21 days of experiment. 3. Periodontal tissues of the irradiated rat group with low calcium diet were destroyed earlier than those of the irradiated rat group with normal diet. Soon this condition was restored and then high cellularity and dense collagen fibers where observed. 4. Many periodontal cells bearing tumor necrosis factor could be clearly observed in the nonirradiated group of rats with normal diet, whereas could not be observed on the 7th day reappeared on 14th day in the irradiated group of rats with normal diet. A few of them could be observed in the group of rats with low calcium diet, but they could be clearly observed in the both groups after 21 days of experiment.
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