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이윤경,이재명,김원일 慶南大學校 附設 工業技術硏究所 1998 硏究論文集 Vol.15 No.2
신소재인 탄소섬유강화 플라스틱(CFRP)을 피삭재로 선삭가공을 통하여 섬유각의 변화에 따른 절삭저항에 관하여 관찰하였다. 절삭저항은 섬유각 절삭깊이가 클수록 증가하고, 섬유각 15˚ 90˚ 는 절삭속도 40m/min 이상에서 절삭저항이 작아지나, 섬유각 45˚ 60˚ 에서는 절삭속도 40m/min 이상에서 절삭저항이 급격히 증가함을 알 수 있었다. 이송분력이 주분력 배분력보다 거의 2배 가까이 큰것은 섬유의 각도가 클수록 섬유의 방향이 이송방향에 미치는 영향이 크기 때문이라고 생각 된다. CFRP의 최적가공조건은 섬유각 15˚절삭속도 60m min임을 알 수 있다. Carbon Fiber Reinforced Plastic(CFRP), one of the new materials, was investigated about cutting resistance according to the change of fiber angle through in turning Cutting resistance, increases as the fiber angle increases. At the fiber angle of 15˚and 90˚ cutting resistance decreases for the cutting speed more than 40m/min. At the fiber angle of 45˚ and 60˚ cutting resistance increases for the cutting speed less than 40m' min becomes nearly two times the principal force the direction of fiber largely influence upon feed direction. Optimum cutting condition of CFRP can be found to the fiber angle 15˚and cutting speed of 60m/min.
박병윤,이영호,이명철 大韓成形外科學會 1987 Archives of Plastic Surgery Vol.14 No.1
There are two approach methods in reduction of mandibular fracture, one is external approach and the other is intraoral approach. Most surgeon have been used external approach but intraoral approach gives many benefits. The authors performed interosseous fixation of various sites of 10 cases of mandibular fracture through intraoral approach and concluded that advantages of this method are; 1. no external scar 2. complete reduction (alignment) 3. decreased rate of malunion, maloclusion 4. fewer possibility of facial nerve injury 5. shorter operation time.
용액 중합에 의한 전도성 Poly(amide)/Polypyrrole 복합체의 제조와 그 전기적 성질
박연흠,안찬호,한명희 成均館大學校 科學技術硏究所 1993 論文集 Vol.44 No.1
Poly(amide)/Polypyrrole composite films were prepared by solution ploymerization method. The films obtained by this method exhibited high conductivities. After polymerization of pyrrole for 1 hr, composite films showed the conductivity as high as 10^-3∼10^-2 S/cm and it increased with increasing the concentration of oxidizing agent. The stability of conductivity to ambient air exposure was excellent. As the result of the thermal characterization of composite films by TGA, we found that the composite film was thermally stable.
Tubular Motor의 動作特性解析 및 開發에 관한 硏究
李殷雄,張錫明,朴允鎬 충남대학교 공업교육연구소 1981 論文集 Vol.4 No.1
This study is to develop the tubular linear induction motor(TLIM) which consists of a travelling aluminum bar and concentric stator windings through examination of theoretical and experimental performance characteristics at slip 0.5% i. e. vector potential, magnetic flux density, thrust force, and power factor in a TLIM. In this study authors examine the practical values of this type motor from the mechanical and economical points of view, and suggest some criteria to have an efficient machine.
유능수,남윤수,이정완,이명재 강원대학교 산업기술연구소 2005 産業技術硏究 Vol.25 No.B
Two methods, the bin averaging method and least square method, are often used in calibrating wind turbine test sites. The objective of this work was to determine a better method to predict the wind speed at wind turbine installing point. The calibration was done at the test site on a complex terrain located in Daegwallyeong, Korea. It was performed for two different cases based on the IEC 61400-12 power performance measurement standard. The wind speeds averaged for 10 minutes ranged between 4 m/s and 16 m/s. The wind-direction bins of each meteorological mast were 10 degrees apart, and only the bins having data measured for more than 24 hours were employed for the test site calibration. For both cases, the two methods were found to yield almost same results which estimated real wind speed very closely.
Hydroxy Propyl Methyl Cellulose의 자연발화에 관한 연구
최재욱,목연수,하동명 한국화재소방학회 2001 한국화재소방학회논문지 Vol.15 No.4
HPM의 자연발화는 일정한 주위온도에서 자연발화의 연구와 Godbret-Greenwald가 고안한 전기로에서 운상상태의 최소발화온도를 구하였으며, 시료를 용기에 충전했을 경우 용기의 크기가 클수록 발화한계온도는 낮아졌으며, 겉보기활성화에너지는 Frank-Kamenetskii의 열발화이론으로부터 계산하였고, 운상상태의 발화온도는 21%의 산소농도하에서 최소발화온도를 구하였으며, 산소농도 변화의 실험결과 산소농도 10%에서 발화되지 않았으며 한계산소농도를 구할 수 있었다. The spontaneous ignition of hydroxypropyl methyl cellulose(HPMC) was investigated at constant ambient temperature in the oven and minimum ignition temperature of dust clouds with Godbret-Creenwald Furnace respectively, In the experiments of the vessel filled with sample, the larger the vessel was the lower the spontaneous ignition temperature and ambient temperature was calculated from the Frank-Kamenetskii thermal ignition theory, The minimum ignition temperature for the dust cloud state was found under 21% oxygen concentration. At the experiment with the change of oxygen concentration, HPMC was not ignite at 10% O2 and so the limiting oxygen concentration was obtained at 10%. Keywords : Spontaneous ignition, Ambient temperature, Minimum ignition temperature Frank-Kamenetskii thermal ignition theory
고종호,황명오,문주수,황성연,손종연 한국조리과학회 2005 한국식품조리과학회지 Vol.21 No.2
This study was investigated on antioxidative and antimicrobial activities of PSW(pomegranate seed water extract), PSE(pomegranale seed ethanol extract) and PSO(pomegranate seed oil). 'rile extraction yields of PSW, PSE and PSO were 28,9, 13.0 and 4.9%, respectively. Total phenol contents of PSW, PSE and PSO were 47, 78 mg/g(dry basis) and 40 mg/g, respectively. Electron donating abilities of PSW, PSE and PSO at 1,000 ppm were 18.8, 28.5 and 9.7%, respectively. Antioxidative activities in linoleic acid substrates at 500 ppm were in order of 1'SE > a-tocophcrol > PSW > PSO. Antioxidative activities in linoleic acid emulsion substrates at 200 ppm were in order of α-tocopberol > PSE > PSW > PSO, In antimicrobial activity, PSO showed growth inhibition effect against Micrococcus luteus, Salmonella enteritidis and PSW showed growth inhibition effect against Bacillus cereus, Escherichia coll. Whereas antimicrobial activity' of PSE was not observed. The nitrite-scavenging abilities of PSW, PSE and PSO at 2,000 ppm were 27.5, 23.7 and 39.6%, respectively. And the SOD-like activities of PSW, PSE and PSO at 1,000 ppm were 15.9, 34.9 and 0.10%, respectively.