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극미세 입자 Aluminosilicate 계 졸의 합성 및 응용 : (Ⅰ) SiO₂및 γ-AIOOH졸의 제조 및 케릭터라이제이션
현상훈,송재권,강범석 연세대학교 산업기술연구소 1993 논문집 Vol.25 No.1
Nanoparticulate silica sols could be synthesized by an interfacial hydrolysis reaction between TEOS and high alkaline water. The silica sols were extremely stable at pH of 8 and their average particle sizes were less than 3 nm, while very unstable between 4 and 5 of pH. The sol particles grew up to about 10 nm within 1 day in the region of pH less than 7. It was found that the silica sol with pH less than 2 was stabilized without further growing after 1 day-aging. The particle size of γ-AlOOH sols synthesized via the modified Yoldas-method could be controlled according to the mole ratio of nitric acid/aluminium tri-sec-butoxide(0.07∼1.0). The stable γ-AlOOH sol with the average particle size of 45 nm, which was prepared using the mole ratio of 0.07, was estimated to be suitable for coating reproducible γ-AlOOH membrane layers with the high specific surface area.
현범수 韓國海洋大學校 附設 海洋科學技術硏究所 1998 硏究論文集 Vol.7 No.-
해양오염 사고시 유출유의 수거를 위하여 사용되는 유회수기에 대하여 고찰하였다. 논문의 주요 내용은 (1) 유회수기의 종류, 장단점, 성능지표 및 시장현황에 대한 개괄적인 설명과 (2) 유회수 성능에 영향을 미치는 인자들에 대한 고찰, 그리고 (3) 유회수기 분야에 대하여 현재까지 발표된 논문들에 대한 핵심 아이디어들을 소개하였다. 끝으로 (4) 유체역학적 관점에서 본 유회수기의 특성과 해양, 토목, 기계등 유사관련분야의 연구결과가 유회수기 해석에 어떻게 이용될 수 있는지에 대하여 고찰하였다. The hydrodynamic characteristics of oil skimmers are reviewed. The paper consists of (1) introduction of the general aspects of oil skimmers, including kinds, performance indices, current market situations, (2) the analysis of factors affecting oil-skimming, (3) the review of existing papers with a special focus on hydrodynamic problem and finally (4) conclusions and some suggestions. The purpose of this paper is to draw hydrodynamists' attentions on oil skimmer, more broadly on marine oil spill.
신경인성 과반사성 배뇨근에 대한 배뇨근 내보툴리눔 독소 A 주사
고현윤,신용범,손현주,장재혁,이경미,문혜정,하용훈 부산대학교 병원 암연구소 2008 부산대병원학술지 Vol.- No.23
Local injections of botulinum toxin A have been reported in the treatment of neurogenic bladder dysfunctions including detrusor sphincter dyssynergia and detrusor overactivity. We reports a case of intradetrusor injection of botulinum toxin type A in acervical cord injured patient with neurogenic overactive detrusor refractory to high dose anticholinergic medication. Botulinum toxin A (200 units) was injected cystoscopically into the detrusor in 40 sites over the bladder with sparing the trigone. Urodynamic studies were performed at baseline, and eight days, four weeks, and eight weeks after intradetrusor injection. There was marked improvement of the urodynamic parameters including maximum cystometric capacity and maximum detrusor pressure after intradetrusor botulinum toxin injection.
김용범,김현갑,김용우,손호영 서울産業大學校 1994 논문집 Vol.39 No.1
전통적인 흡착물질로 가장 많이 애용되어 온 활성탄(AC)과 새로히 개발된 천연고분자 물질 chitosan(CS) 및 脫 lignin톱밥(SD)으로 각각의 여과용 column을 만들고 음용수에 인위적으로 혼입해 둔 pb²+, Cd²+, Cu²+, Mn²+ 및 CN-에 대한 흡착 제거 성능을 비교 연구 하였다. 음용수에 혼입한 각 물질의 원 농도는 Pb²+; 3ppm, Cu²+; 3.1ppm, Mn²+; 0.7ppm, CN;5.3ppm였으며 이들 물질로 각각 단일용액을 조제하여 실험할때는 유속을 1.33㎤/min으로, 혼합용액으로 실험할때는 0.74㎤/min으로 하고, 충전된 흡착제의 건조 중량은 각가 10g으로 하여 흡착제거 실험을 하였다. 위의 각각의 단일 물질 용액에 대한 흡착제의 단위 중량(g)당 파괴점까지의 제거 용량은 Pb²+의 경우, 활성탄이 3.3ℓ, 탈 lignin톱밥이 3.5ℓ로 나타났고, Mn²+의 경우 활성탄이 10ℓ, 탈 lignin톱밥이 12ℓ, chitosan은 12.5ℓ로 나타났으며, CN-의 경우에는 활성탄이 4.8ℓ, 탈 lignin톱밥이 5.5ℓ, chitosan은 4.7ℓ로 각각 나타났다. 이들 혼합용액에 대해서는 단위 중량(g)당 파괴점까지의 흡착제거 용량은 pb²+의 경우, 활성탄이 2.5ℓ, 탈 lignin톱밥이 2.8ℓ, chitosan은 2.7ℓ로 나타났고, Cd²+의 경우, 활성탄이 2.4ℓ탈 lignin톱밥이 2.7ℓ,chitosan은 2.4ℓ로 나타났으며, Cu²+경우에는 활성탄이 2.8ℓ탈 lignin톱밥이 3.2ℓ, chitosan은 2.7ℓ로 나타났다. 대체로 Pb²+, Cd²+, Mn²+ 등 금속이온에 대한 흡착제거에 있어서는 탈 lignin톱밥과 chitosan의 경우가 활성탄보다는 10~30%정도 높은 제거율을 보였으며, CN-에 대해서는 탈 lignin톱밥>활성탄>chitosan의 순으로 제거 효율을 나타내었다. Some adsorbents prepared from natural resorces were subjected to the experiments of removing some metal ions(pb²+, Cd²+, Cu²+ and Mn²+)and cyanide. The adsorbents applied in the experiments were activated carbon, delignified saw dust and chitosan powder, each of which was packed into a column in order to remove metal ions and cyanide artificially contaminated in the potable water, functioning as filters. The most effective adsorbent was found to be the delignified saw dust column in removing contaminants and activated carbon column was found the poorest among the three. Delignified saw dust demonstrated to be a most effective, cheaper and popular filtering saw dust demonstrated to be a most effective, cheaper and popular filtering material for the purification of potable water which most citizens are not yet confident with.
손현주,김경민,한지의,장재혁,신용범,고현윤 부산대학교 병원 암연구소 2007 부산대병원학술지 Vol.- No.21
Purpose: Numbers and severity of the injured segments and neurological recovery patterns are both vague and confused following cauda equina syndrome (CES). We evaluated the characteristics of CES according to the causes of the injuries resulting in CES. Subjects and Methods: Thirty-nine cases of CES diagnosed by clinical features and electrophysiological studies were recruited. We investigated segments or roots involved, muscle strength grades of key muscles, external anal sphincter tones, and changing patterns of theses findings. Their characteristics were compared according to the traumatic and non-traumatic lesions. Results: In traumatic lesions, lower segments, such as sacral roots, were involved more frequently and severely (p<O.OOl). In non-traumatic lesions, L5 and Sl roots were more injured and S2,3,4 roots were less injured (p<O.05). However, there was no significant difference of severity among the injured segments in non-traumatic disorders. There was no typical recovery pattern in both traumatic and non-traumatic cases. Conclusions: In traumatic CES, lower segments or roots were injured more prevalently and severely. Relatively, upper segments were more affected in non-traumatic CES.