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금속 V-벨트 CVT의 동력전달 특성과 변속비-부하토크-축력 관계
김광원,김현수 대한기계학회 1990 대한기계학회논문집 Vol.14 No.2
Power transmission characteristics and speed ratio-torque load-axial force relationship for a metal V-belt CVT were investigated theoretically and experimentally. In the metal V-belt CVT drive, it was found that the power was transmitted by thrust force and that band tension should be greater than compression force between the metal blocks. The experimental results for the speed ratio-torque load-axial force relationship showed good agreement with those predicted using equations developed from theoretical considerations.
김광원,김현수 대한기계학회 1989 대한기계학회논문집 Vol.13 No.5
본 연구에서는 V-벨트 CVT의 핵심인 변속비-부하토오크-축력에 대한 이론적 연구에 이어 실험적 연구를 통하여 전 연구에서 구한 이론식과 비교 검토하고 V-벨트 CVT의 기초 설계자료를 얻고자한다. Axial force of a V-belt CVT is investigated experimentally. The experimental results on speed ratio-torque-axial force show good agreement with the theoretical results that were obtained in the previous work. It is also found that torque capacity of the V-belt CVT increases as the axial force and the speed ratio increase. Impending slip which occurs at the maximum torque is determined via experiments for various speed ratios. Based on the impending slip region, and the theoretical curves for the speed ratio-torque-axial force relationship, an actual operating criteria for the V-belt CVT is obtained. It is suggested to use the actual operating criteria with the theoretical equations as a basic design formula for the V-belt CVT.
김광원,이문규,이명식,고은미,민용기,정재훈,안규정,김경아,김연선,기현균 대한내분비학회 1997 Endocrinology and metabolism Vol.12 No.1
Down's syndrome(trisomy 21) has been frequently associated with thyroid disease, mainly subclinical hypothyroidism(12.5-32.5%). The occurrence of Downs syndrome in conjunction with hyperthyroidism is rare(0.6-2.5%). The mechanism that Down's syndrome was frequently associated with autoimmune thyroid disease is not clear, but T cell maturation defects and overexpression of chromosome 21 products in Down's syndrome have been suggested. A 19-year-old female was transferred because of generalized weakness. She was born to a 42- year-old mother, She had been suffered from heat intolerance, weight loss, palpitation, dyspnea on exertion and neck swelling and had intermittently taken some medication since her age 9. She had mental retardation(IQ 41) and underdeveloprnent. Exophthalmos, upward-outward slant of palpabral fissures, epicanthal folds, lowset ears, and large, protruding, fissured tongue were identified. Short fifth middle phalanges, clinodactyly and small-sized interventricular septal defect were also detected. Thyroid gland was diffusely enlarged four times the normal size, firm in consistency and had a bruit. Serum T concentration was 7.8ug/dL, T2 306ng/dL, and TSH 0.01ulU/mL. She was positive for thyroid autoantibodies(antimicosomal antibody 1,867 IU/mL, antithyroglobulin antibody 106 IU/mL, and TBII 79.6%). Twenty-four hours radioactive iodine uptake was 64%. Chromosomal analysis with T cell culture stimulated by phytohemagglutinin revealed 47XX, 21 trisomy. Pituitary hormones except TSH were fully stimulated by combined pituitary stimulation. She was finally diagnosed as Down's syndrome with Graves' disease and controlled with use of methimazole. (J Kor Soc Endocrinol 12:61-67, 1997)