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Wan Meng,강인규,손한규 한국생체재료학회 2003 생체재료학회지 Vol.7 No.1
Poly(3-hydroxy butylate-co-3-hydroxy valerate) (PHBV, 34 mol% of hydroxy valerate) film was prepared by dissolving chloroform and casting on a glass plate. Acrylic acid-grafted PHBV (PHBV-C) and N-p-vinylbenzyl-O--D-galactopyranosyl-(1→4)-D-gluconamide (VLA)-grafted PHBV(PHBV-VLA) were prepared by the treatment of PHBV film with oxygen plasma, followed by the graft polymerization of acrylic acid (AA) and VLA, respectively. Collagen-immobilized PHBV was also prepared by the coupling reaction of PHBV-C and collagen using water soluble carbodiimide (WSC). Surface characterization of modified PHBVs were carried out using electron spectroscopy for chemical analysis (ESCA), attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy, and contact angle goniometer. Attachment and morphology of mouse hepatocytes on surface-modified PHAs were investigated using 3-(4,5-dimethyl thiazo l-2-yl)-2,5-diphenyltetrazolium (MTT) method and light microscope. Amounts of AA, collagen, and VLA introduced to the PHBV film surfaces as determined by gravimetric method were about 38, 78, and 12 g/cm2, respectively. Amount of hepatocytes adhered to PHBV-COL and PHBV-VLA were significantly larger than those to PHBV and PHBV-C, showing specific interaction of surface VLA groups with hepatocytes.
맹주성(J.S.Maeng),윤준용(J.Y.Yoon),이길용(K.Y.Lee),손한규(H.G.Shon) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
The knowledge of flow patterns in bus engine room is important in designing engine room layout, because auxiliary units could be damaged and radiator be affected by heat. Flow patterns of simplified prototype bus engine room were investigated with four different inlet configurations by numerical and experimental approaches. The results show that Thermal damages are caused by weak and isolated flow in the engine room and the cooling performance of radiator is inefficient due to non-uniformity. Through the prototype bus engine room test, it was proved that the suggested model was efficient in not only preventing thermal damages but also improving cooling performance of radiator. In general, numerical solutions were in agreement with experimental results.<br/>
중형트럭 현가계의 설계변수 변화에 따른 피칭운동이 민감도 해석
이희범(H.B.Lee),이기호(G.H.Lee),김태식(T.S.Kim),손한규(H.G.Sohn) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
Ride quality of medium truck became an important item, due to increase the standard of life style. This study describes how to determine and evaluate design parameters related to chassis suspension system through time and frequency analysis. The spring stiffness and damping force of the chassis suspension system were obtained by the magnitude of the vertical acceleration PSD. The simulation was carried out on the various road profile, which is suggested by ISO. The body pitching of medium truck item which should be studied for ride quality. We made truck model by use of DADS, which is dynamic analysis software, in order to find out the truck motions. From the results of sensitivity analysis of suspension parameters,we found out that, the spring and shock absorber affect the pitching of the medium truck. In order to truck model validation, We carried out actual test.<br/>