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최준원,최준철,나화엽,심동준,김영호,이상호,조형욱,Choi, Jun-Weon,Choi, Joon-Choil,Na, Hwa-Yeop,Shim, Dong-Joon,Kim, Young-Ho,Lee, Sang-Ho,Cho, Hyoung-Wook 대한족부족관절학회 2005 대한족부족관절학회지 Vol.9 No.1
The midtarsal joint which consists of the talonavicular and calcaneocuboid joints lies transversely across the medial and lateral arches of the foot. Complete dislocation of this joint unassociated with fracture is extremely rare. A 36 year-old male who was injured by motor vehicle accident came to help for his left midfoot pain and deformity. We misdiagnosed as subtalar dislocation. Closed reduction was performed. We reviewed initial and post-reduction X-rays, and then we diagnosed as Chopart's dislocation. CT scan was taken; it showed fracture of the anterior process of the calcaneous.
최준원(Choi, Joon-Weon),임헌진(Lim, Hyun-Jin),조태수(Jo, Tae-Su),한규성(Han, Gyu-Sung),최돈하(Choi, Don-Ha) 한국신재생에너지학회 2007 신재생에너지 Vol.3 No.1
To characterize thermo-chemical feature of sugar conversion of woody biomass, poplar wood (Populus;alba{times}glandulosa) powder was treated with supercritical water system. Supercritical water treatment (SCWT) was performed for 60 seconds at different temperatures (subcritical zone 350; supercritical zone 300,;400,;425?C) under two pressures 230{pm}10atm as well as 330{pm}10atm, respectively, using flow type system. After separation of solid residues from SCWT products, the monomeric sugars in aqueous part converted from poplar wood powder were quantitatively determined by high performance anionic exchange chromatography [HPAEC] equipped with PAD detector and Carbo Pac PA10 column. As the temperature treated increased, the degradation of poplar wood powder was enhanced and ca 83% of woody biomass was dissolved into the water at 425?C. However, the pressure didn't help the degradation of biomass components. At subcritical temperature range, xylose was first formed by degradation of xylan, which is main hemicellulose component in hardwood species, while cellulose degradation started at the transition zone between sub and supercritical conditions and was remarkably accelerated at the supercritical temperature. In the supercritical water system the maximum yield of monomeric sugars amounts to ca. 7.3% based on oven dried wood weight at 425?C.
목질바이오매스의 급속열분해에 의해 생산된 바이오오일의 특성 분석
최준원(Choi, Joon-Weon),최돈하(Choi, Don-Ha),조태수(Cho, Tae-Su) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.06
유동형 급속열분해기((fluidized bed type fast pyrolyzer, 용량 300g/h)를 이용하여 너도밤나무와 침엽수 흔합재(독일가문비나무/전나무, 50:50)로부터 바이오오일을 생산하였다. 목질바이오매스의 열분해는 약 470{pm}5?C에서 1-2초 간 진행되었다. 목질바이오매스의 열분해 생성물의 조성을 살펴보면, 너도밤나무는 바이오오일이 약 60%, 탄이 약 9% 피리 고 가스가 31% 가량 생산되었으며, 침엽수 혼합재는 49%의 바이오오일, 9%의 탄, 그리고 42% 가량의 가스가 생성되었다. 두 종류의 목질바이오매스에서 생산된 바이오오일에는 약 17-22% 가량의 수분이 포함되어 있었으며, 비중은 약 1.2kg/L 이었다. 바이오오일의 원소 조성은 탄소가 45%, 산소가 47% 수소가 7%, 그리 고 질소가 1% 로서 일반적 인 목질바이오매스와 큰 차이는 없는 것으로 나타났다. 그러나 화석자원에서 생산되는 오일류와 비교하여 산소함량은 매우 높았으나 황은 전혀 포함하고 있지 않았다. 바이오오일의 GC분석 결과 총 90여종의 고리형, 또는 비고리형 저분자량 화합물이 검출되었으며 이들의 함량은 바이오오일 전건중량의 31-33% 정도로 측정되었다.