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강인규,류정수,권영호,이승현,박신영,Kang, In-Gyu,Ryu, Jeong-Su,Kwon, Young-Ho,Lee, Seung-Hyun,Park, Shin-Young (사)한국토질및기초기술사회 2006 기술발표회 Vol.2006 No.-
Soil nailing systems are generally many used in underground excavations and reinforcements of slopes since the first construction as a temporary retaining wall in 1993, Korea. In recently, they are many attempts to expand the permanent reinforcements of slopes However, experimental studies related to soil nailing systems are insufficient Specially, there are no researches related in the large scaled load tests of soil nailed walls in Korea In this study, a case study on the large scaled load tests of soil nailed walls is introduced and the behavior characteristic of them is investigated Also, they are proposed allowable deformation corresponding to the serviceability limit of soil nail walls and ultimate deformation corresponding to the collapse state of the walls. These results can be applied to the maintenance management of soil nailed walls And analysis on the required minimum factor of safety of soil nailed walls using the relation curve of load ratio and deformation ratio are carried out
강인규,강신성,임학상,Kang, Inn-Kyu,Kang, Shin-Sung,Lim, Hak-Sang 대한의용생체공학회 1992 의공학회지 Vol.13 No.2
Attachment and growth of mouse flbroblast cells on block copolypeptides were studied in the pres once or absence of serum proteins. Cells are rapidly attached to she polymer surface within 30 min regardless of substrate in the presence of serum. The number of flbroblast cells attached on the poly mer surface coated by collagen was larger than thats on the bare surface. Attachment of cells Is as a whole suppressed to a low level by the addltion of sodium azide in the absence of serum. Thls suE gests that the active attachment of cells requires the biological metabolism taking place on polymer substrates. In the presence of serum protein, flbroblast cells are more rapidly grown on the bolck co polymer consisting of poly(T-benzyl L-glutamate) (PBLG) and polyoxypropylene(POP) than on other block copolymers. These results were in agreement wish the data obatlned by an Inverted ml croscope.
강인규,인만진,오남순,Kang, In-Kyu,In, Man-Jin,Oh, Nam-Soon 한국응용생명화학회 2003 한국농화학회지 Vol.46 No.2
Hemoglobin(Hgb)의 가수분해물로부터 heme-iron을 분리하는데 영향을 미치는 Hgb의 농도, 가수분해도(DH, degree of hydrolysis), 투석용액의 pH, 투석막의 pore size에 대하여 조사하였다. 가수분해에 사용된 Hgb의 농도가 높아짐에 따라 heme-iron의 회수율은 증가하였으나, peptide의 제거율과 HP ratio(총 peptide 중 heme-iron이 차지하는 비율)는 Hgb의 농도에 따른 큰 차이를 볼 수 없었다. Hgb의 가수분해도가 8%, 16%, 24%로 증가함에 따라 투석에 의한 peptide의 제거가 용이하게 이루어져 HP ratio가 13.7%, 20.7%, 31%로 증가하였다. 투석용액에 $KH_2PO_4$를 25 mM이 되도록 첨가할 때는 HP ratio가 25.7%이었으나,50 mM이상의 농도에서는 30.0-32.5%로 증가하였다. 투석용액의 pH 높을수록 heme-iron의 용해도가 증가하여 투석막을 통한 heme-iron의 세출이 많아졌다. Peptide의 제거율은 투석막이 2kDa에서 5kDa로 커질 때 74.5%에서 87.5%의 큰 폭으로 증가하였으며, heme-iron의 회수율은 투석막의 크기에 따라 감소하여 2kDa에서는 86.5%, 15kDa에서는 79.6%, 25kDa에서 63.1%로 급감하였다. 투석법에 의해 분리, 건조된 heme-iron제품의 heme-iron과 peptide의 함량은 각각 21.7%와 77.0%이었으며, HP ratio는 28.2%, 수율은 6,5%이었다. A method for separating heme-iron from hemoglobin (Hgb) hydrolysate by dialysis was developed. Recovery of heme-iron increased with increasing Hgb concentration, whereas rejection of peptide and separation effciency expressed by HP ratio (heme-iron/peptide) did not show significant differences. HP ratio increased with increases in the degree of hydrolysis of Hgb and $KH_2PO_4$ concentrations of dialysis solution. Recovery of heme-iron decreased with increase in the pH of dialysis solution due to wash-out of heme-iron across the dialysis membrane caused by increase in solubility of heme-iron. Rejections of peptide were 74.5 and 87.5% (2 and 5 kDa of cut off size, respectively), whereas recovery of heme-iron decreased from 86.5 (2 kDa) to 63.1% (25 kDa). Amounts of heme-iron and peptide of dried heme-iron product were 21.7 and 77.0%, and HP ratio and production yield were 28.2 and 6.5%, respectively.
새로운 생체적합성 폴리펩티드공중합체의 합성과 혈액적합성에 관한 연구 : 측쇄에 에틸렌글리콜을 함유하는 폴리펩티드 공중합체의 혈액적합성
강인규,박상동,조종수,성용길,Inn-Kyu Kang,Sang Dong Park,Chong Su Cho,Yong Kiel Sung 대한화학회 1992 대한화학회지 Vol.36 No.6
Poly (γ-benzyl L-glutamate) (PBLG)와 말단에 아미노기를 갖는 Polyethylene glycol (PEG)의 치환반응을 행하여 PEG-grafted PBLG (PEG-g-PBLG)를 합성하였다. 또한 PEG-g-PBLG 필름표면에 ethanolamine(EA)을 치환반응하여 표면에 히드록시그룹을 갖는 PEG-g-PBLG-EA 필름을 얻었다. 폴리펩티드중합체와 혈액성분과의 상호작용에 관한 실험결과, PEG-g-PBLG 상에서의 혈소판의 점착율 및 형태변화는 PEG-g-PBLG-EA보다 적게 나타났고, PEG-g-PBLG상에서의 혈장 단백질의 응고시간은 PEG-g-PBLG-EA 또는 PBLG의 응고시간보다 길게 나타났다. 이들 결과는 혈액응고시간 및 혈액응고량을 조사한 실험결과와 일치하였다. 따라서 폴리펩티드상의 히드록시그룹은 혈액성분과의 상호작용을 강하게 하여 혈액적합성이 저하하는 반면, PEG-g-PBLG는 비교적 좋은 혈액적합성을 나타냄을 알 수 있었다. Polyethylene glycol (PEG) grafted poly (γ-benzyl L-glutamate) (PBLG) was synthesized by the substitution reaction of PBLG and PEG having primary amino groups at both ends. PEG-g-PBLG films containing hydroxyl group were also prepared by the substitution reaction of PEG-g-PBLG film and ethanolamine (EA). Adhesion of platelets and activation of plasma proteins on the copolypeptide films were studied. The results showed that platelets are less adhered and activated on the PEG-g-PBLG than on other polypeptides and plasma recalcification time (PRT) on the PEG-g-PBLG was longer than that on other polypeptides. These results were consistent with those of blood clotting time and thrombus formation on the polypeptides. As a results, PEG-g-PBLG surfaces showed better blood compatibility than PBLG or PEG-g-PBLG-EA surfaces.
단열처리 유도배수에 의한 기존 2-Arch 터널의 누수방지 사례
강인규,류정수,김태수,Kang. In-Kyu,Ryu. Jeong-Soo,Kim. Tae-Soo 한국방재학회 2007 한국방재학회 학술발표대회논문집 Vol.2007 No.1
This case was successfully constructed as a leakage prevention case of primary 2-arch tunnel located in Anyang, Gyungkido. The leakage of primary 2-arch tunnel was observed at middle wall of tunnel and girder of tunnel. Such a leakage of primary 2-arch tunnel generally occurred due to the damage of the waterproof membrane constructed on the middle wall during the blasting works of right and left tunnel after construction of the middle wall. As the leakage, icicles hanged from girder of tunnel in the winter. In such phenomenon, the risk of the traffic accident in the tunnel was high. In this case, leakage prevention works were successfully constructed using the heat insulated drainage.