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고속 비행의 Lift-offset 복합형 헬리콥터 기체의 능동 진동 제어 시뮬레이션
홍성부,권영민,김지수,이유빈,박병현,신현철,박재상,Hong, Sung-Boo,Kwon, Young-Min,Kim, Ji-Su,Lee, Yu-Been,Park, Byeong-Hyeon,Shin, Hyun-Cheol,Park, Jae-Sang 한국군사과학기술학회 2021 한국군사과학기술학회지 Vol.24 No.4
This paper studies the simulations of active airframe vibration controls for the Sikorsky X2 helicopter with a lift-offset coaxial rotor. The 4P hub vibratory loads of the X2TD rotor are obtained from the previous work using a rotorcraft comprehensive analysis code, CAMRAD II. The finite element analysis software, MSC.NASTRAN, is used to model the structural dynamics of the X2TD airframe and to analyze the 4P vibration responses of the airframe. A simulation study using Active Vibration Control System(AVCS) with Fx-LMS algorithm to reduce the airframe vibrations is conducted. The present AVCS is modeled using MATLAB Simulink. When AVCS is applied to the X2TD airframe at 250 knots, the 4P longitudinal and vertical vibration responses at the specified airframe positions, such as the pilot seat, co-pilot seat, engine deck, and prop gearbox, are reduced by 30.65 ~ 94.12 %.
콜라겐으로 유발된 관절염에 대한 피록시캄 및 황금 가수분해물 복합 히드로겔의 항염 효과
김태균,안효초,윤미영,임재윤,채병숙,김대근,박병현,양재헌,Kim, Tae-Kyun,Ahn, Hyo-Cho,Yun, Mi-Young,Leem, Jae-Yoon,Chae, Byeong-Suk,Kim, Dae-Keun,Park, Byung-Hyun,Yang, Jae-Heon 대한약학회 2008 약학회지 Vol.52 No.5
In order to access the suppressive effects of piroxicam (PX) and hydrolyzed products of Scutellariae Radix (PSH) on arthritis, we investigated whether PSH gel could suppress the progression of collagen-induced arthritis. PX, one of nonsteroidal anti-inflammatory drugs has been used in the systemic and topical treatment in a variety of inflammatory conditions. Scutellariae Radix, one of the herbal medicines, was used for the purpose of anti-inflammatory and anti-bacterials. For the purpose of transdermal absorption of the hydrogel preparations, two classes of hydrogels (PX, PSH) were formulated with carbomer 940, diethylene glycol monoethyl ether, polyethylene glycol-8-glyceryl caprylate/caprate and triethanolamine. In carrageenan-induced edema in rat hind paws, inhibition of foot swelling was more increased in PSH than PX hydrogel. Rheumatoid factors including serum IgG, IgM and collagen specific antibody were present much lower in PSH gel treated mice than control. Histological examination revealed that PSH hydrogel inhibited infiltration of inflammatory cells into affected paw joint, compared with control. The PSH hydrogel would be a suitable preparation to increase transdermal treatment for anti-inflammatory effects on collagen-induced arthritis.