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풍력 블레이드 복합재의 결함 탐상을 위한 NDE 모니터링기법
임광희(K. H. Im),김우진(W. J. Kim),정예원(Y. W. Jeong),조철현(C. H. Cho),김선규(S. K. Kim),조영태(Y. T. Cho) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
Terahertz waves (T-ray) was extensively studied for the nondestructive evaluation of characterization of various and FRP composite materials for a use of wind energy. The composite materials are being utilized on the various areas. Here, T-rays were used to perform NDE when detecting defects in the trailing edge of a wind turbine blade. This study proposed a method to measure a refractive index of a composite, using T-rays (THz) and reviewed the characteristics of the T-ray E-field of a CFRP composite. Particularly, this study produced images to determine defects in the trailing edge of a wind turbine blade and compared and analyzed the images. The TOF of T-ray penetration was measured using a T-ray through-transmission mode to find the following characteristics of the blade. The trailing edge of a nonconductive wind turbine blade could transmit T-rays, enabling the measurement of refractive indices in a through-transmission mode. The effectiveness and limitations of T-ray for the NDE of composites are discussed.
이혜라,조경숙,조철현,조치자 이화여자대학교 의과대학 1979 梨花醫學誌 Vol.- No.11
Maxillary sinusitis is the inflammation of the mucosal lining of a maxillary sinus cavity. This study was performed for the purpose of classification and grading of the chronic maxillary sinusitis. Total 58 cases received for pathologic examination from January 1977 to July 1978, were the material. Authors classified the chronic maxillary sinusitis as edematous, infiltrative fibrous, cystic and mixed type and graded as Grade Ⅰ, Ⅱ and Ⅲ. The results were obtained as follows. 1) Mixed type was the most common histologic classification as 25 cases (60.3%). 2) Grade Ⅱ was the most common grading 37 cases (63.9%).
소아에서 정맥 주사의 혈관외 삼출에 의한 피부 결손의 임상 치험예
최희윤,이인승,김한중,조철현 大韓成形外科學會 1984 Archives of Plastic Surgery Vol.11 No.4
Peripheral intravenous therapy is usually innocuous, but skin necrosis can result when gross extravasation occur. These adverse sequelae are seen infrequently in the adult patient, but in newborns and young children, they may be catastropic. The purpose of this study in to reveal the agents and locations of skin necrosis, and to evaluate the results of therapeutic management.. During the period from March 1,1981 through February 28, 1983, the children who had taken intravenous fluid therapy in our hospital were reviewed. The results are summarized as follows. 1. There was 1,275 extravasation patients among 3,290 intravenous fluid treated children patients during a 2-year period. 2. The frequent locations of skin necrosis were scalp, dorsum of foot, and dorsum of hand in descending order, but the most frequent locations of skin necrosis to the extravasation in rate were dorsum of foot, sole, and wrist. 3. The frequent agents of skin necrosis were cloxacillin, sod. bicarbonate, and cal. gluconate in descending order, but the most frequent agents of skin necrosis to the extravasation in rate were epinephrine, cal. gluconate. sod gluconate, sod. bicarbonate. 4. Authors found no disernible differences in the healing time among the 3 different methods of treatment used.(saline, sofra-tulle, povidone-iodine)