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이봉우,서중석,권태정,이원태 大韓法醫學會 2000 대한법의학회지 Vol.24 No.1
Neurofibromatosis type1(von Recklinghausen's disease) is characterized by multiple skin tumors and abnormal cutaneous pigmentation(cafe au lait spots). Unlikely the solitary neurofibroma, those encountered in von Recklinghausen's disease may cause significant morbidity. The vasculopathy, although poorly recognized manifestation of von Recklinghausen's neurofibromatosisis a major case of fatal cases. One of its most dramatic presentation is the spontaneous hemothorax. We report a case of Von Recklinghausen's disease with multiple neurofibromatosis accompanying intrathoracic hemorrhage due to vascular rupture, which is the first legal autopsy case in Korea.
Xanthomonas sp. EPS-1의 Exopolysaccharide생산을 위한 무기염류의 영향
박석규,손봉수,이상원,서권일,김홍출 순천대학교 기초과학연구소 1995 基礎科學硏究誌 Vol.6 No.-
For the production of high viscosity exopolysaccharide from Xanthomonas sp. EPS-1 which isolated and identified from soils, optimum concentration of inorganic salts were investigated : 0.2% KH_2PO_4, 0.05% MgSO_4·7H_2O, 0.3% NaCl, 0.005% CaCO_3, 0.007% FeSO_4·7H_2O, 0.005% MnSO_4·7H_2O. When EPS-1 strain was cultivated at 30℃ for 72 hours in a jar fermentor (impeller speed 300 rpm, aeration rate 3 vvm, 2 liter), polymer content, product rate and yield(Y_p/s) was 18.4g/ℓ, 0.26g/ℓ/h and 37%, respectively.
신봉철,하석재,강민형,권오양,조명우 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-
In recent, the CFRP(Carbon Fiber Reinforced Plastics) composite has been widely used because it has light-weight and high mechanical strength. Therefore, CFRP composite is applied to variable industrial areas such as aerospace, automobiles, sporting goods, ships and so on. Generally, CFRP composite has been used in the industrial field by mechanical cutting processes. In this research, the CFRP composite specimen are laminated by 64plies with orientation angles such as 0°, 45°, 90° and [0°/±45°/90°]4S. The results are analyzed with cutting force and cutting surface.
홍봉식,김태균,오승엽,김환우,권오석 충남대학교 공업교육연구소 1983 論文集 Vol.6 No.2(A)
The currenty offered experiment courses are completely reconsidered and reconfigured. The whole subjects are divided into 10 seperate courses, each of which should represent either basic or advanced stages of differing fields of the electronic engineering. It has been aimed that the courses form an elaborate hierachy so that they are minimally redundant but linked to one another in their fringes. Also, it has been pursued that the new courses should not fall obsolete in at last next five years exploring the maximum possibilities of the currently available equipments.
외부 프리스트레스 도입에 의한 노후된 콘크리트 거더교의 보강성능평가
박승범,홍석주,이봉춘,장석호,권혁준 충남대학교 산업기술연구소 2000 산업기술연구논문집 Vol.15 No.1
One of the promising methods to enhance the flexural strength of a externally prestressed girder is to place the tendons with large eccentricities. The analysis and design of composite girders prestressed by external tendons involve difficulties related mainly to the position of anchorages and the construction sequences. This study was conducted on the concrete bridges reinforced by the continuous girders and the external prestressing. The test results in this study showed that the external prestressing of a composite girder increased the range of the elastic behavior, reduced deflections, increased ultimate strength, and added to the redundancy by providing the multiple stress paths.
Aspergillus awamori와 Zymomonas mobilis로 구성된 고정화혼합 배양계의 에탄올 생산에 미치는 Triton, PVA 및 PEG의 영향
이상원,서권일,박석규,손봉수,김홍출,성찬기 순천대학교 기초과학연구소 1995 基礎科學硏究誌 Vol.6 No.-
The effects of triton-X 100, PVA and PEG on the ethanol production and raw starch hydrolysis by co-immobilized A. awamori and Z. mobilis (A-Z system) were investigated. When gel beads containing A. awamori(1.25 × 10 exp (9) spores/ℓ - gel) and Z. mobilis(0.5g cell/ℓ - gel) were cultured in 2% raw starch solution at 30℃ for 120 hours, ethanol concentration, ethanol yield (Y_p/s) and pH of culture broth were 2.8g/ℓ, 0.16 and 3.8~4.0, respectively. Ethanol production and starch hydrolysis by addition of PVA was efficient, compared to that of PEG and ethanol concentration in culture broth with 0.2% PVA was 3.56g/ℓ. At A-Z 36 culture system with changing silicon check valve for cotton plug at 36 hours in A-Z culture system, ethanol yield on glucose, Y_p/s = 0.36, showed 2 times higher than that of control culture system(cotton plug culture). Ethanol production and productivity by cultivating 85g gel beads at 30℃ in a 1ℓ jar fermentor(220rpm) of medium 500㎖ were 32g/ℓ and 1.8g/ℓ/day, respectively. After 12 hours of cultivation, gel beads were distinguished oxygen-rich surface for A. awamori from oxygen-deficient central part for Z. mobilis.