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김해숙,한동준,임재명,전은주,최용범,김병욱,강성환,신혜영 강원대학교 석재복합신소재제품연구센터 1997 석재연 논문집 Vol.2 No.-
본 연구는 폐기물의 형태로 현재 산과 계곡에 투기되어 있는 석탄페석을 이용하여 중금속 흡착과 난분해성 COD 및 색도제거 가능성을 검토하고, 간단한 열처리를 통한 흡착능 개발 실험을 위하여 수행되었다. 실험 결과 천연상태의 석탄폐석은 약 20∼30%의 중금속 흡착능을 지니고 있는 것으로 나타났으며, 탄화 공정인 간단한 열처리 만으로도 약 2 ∼ 5배의 흡착능 향상이 이루어졌다. 그리고 석탄폐석의 열처리 조건 변화에 따른 중금속 흡착능 실험에서는 500℃ 에서 6시간 반응시킨 것이 가장 우수하였다. 칼럼실험에 있어 기존의 입상활성탄 보다 처리효율이 저조하나 석탄폐석은 무가공 상태로도 약 30 ∼ 60%의 COD 및 색도를 제거할 수 있었다. 500℃에서 6시간 열처리된 폐석의 컬럼실험에서 생물학적 유출수의 색도 제거에 우수함을 알 수 있었으며, 중금속 및 COD제거에 있어서는 여과 속도에 따라 많은 차이를 보였다. 본 연구에서는 열처리 공정만 적용한 기초 실험이였으나, 석탄폐석의 흡착제 개발의 가능성을 알 수 있었으며, 활성화 공정을 적용할 경우 흡착능은 더욱 향상될 것으로 판단된다. This reaserch aims to remove the heavy metals, NBDCOD, and color using the coal waste. The expermental by heat treatment. was performed to advance the adsorption capacity. The results are as follows ; ⅰ) The coal waste had the adsorption capacity of heavy metals and the rates were in the range of 20 to 30 percents. ⅱ) The heat treatment was the optimum condition that the reaction time was 6 hours at 500 ℃. ⅲ) In the column experimental, non-treated coal waste removed the COD and color in the range of 20 to 60 percents. ⅳ) Heat-treated coal waste showed the high removal rate of the color in biological effluent, but heavy metal and COD removal rates were changed by the filteration rates.
( Jay Song ),( Kook Hyun Kim ),( Sung Bum Kim ),( Seung Min Chung ),( Yo Han Jeong ),( Kyeong Ok Kim ),( Si Hyung Lee ),( Byung Ik Jang ),( T Ae Nyeun Kim ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
A 58-year-old male visited our hospital with a complaint of epigastric pain for two days. The patient underwent appendectomy 4 days ago. Physical examination showed neither purpuric skin nor tenderness on joints. Abdominal computed tomography (CT) scan showed concentric segmental wall thickening of the duodenum. Esophagogastroduodenoscopy showed diffuse erythematous mucosa covered with scattered ulcerative exudates from bulb to third portion of duodenum (fig. 1). Blood chemistry was as follows: WBC, 12,030/mm3 and C-reactive protein, 0. 925 mg/dL. Urine analysis was normal. Possibility of bacterial or cytomegalovirus infection, and ischemic enteritis were ruled out. On the 4th hospital day, the patient developed hematochezia. The colonoscopy showed circumferential erythematous mucosa with ulcerative hemorrhage at terminal ileum (fig. 2). The microscopic examination identifi ed a lots of neutrophil infi ltration and deposition of IgA on vascular endothelium, consistent with vasculitis (fig. 3). A Follow-up CT scan demonstrated along segmental thickening of terminal ileum(fig. 4). Treatment with oral prednisone 40mg was initiated due to the persistent hematochezia and symptoms. On 19th day, the patient developed hematuria and proteinuria at urinalysis. Histologic examination on renal biopsy showed focal proliferative glomerulonephritis with crescent formation and strongly positive IgA staining, mainly in the glomerular mesangium (fig. 5). On 29th day, a follow-up endoscopy illustrated a marked improvement of hemorrhagic mucosa of small intestine (fig. 6). Henoch-Schnolein purpura (HSP) is known to accompany purpuric skin lesions in almost all cases. The diagnosis of HSP for gastroenterologist is complex and demanding if there are no distinct clinical features, such as purpura or arthralgia. Severe hemorrhagic mucosa on endoscopy, deposition of IgA on kidney and vascular endothelium of intestine confi rmed the diagnosis of HSP. We report a severe duodenoileitis diagnosed by endoscopy for clinicians to be well informed of unusual pattern of HSP.
The Outsourcing Success Factors : Focusing on the Defence Sector
Dae Bum Ryu,Byung Sub Cho,Jay In Oh 한국IT서비스학회 2011 한국IT서비스학회 학술대회 논문집 Vol.2011 No.9
본 연구는 최근까지 연구가 없었던 국방부문의 아웃소싱 성공도에 영향을 미치는 요인에 대해 분석하였다. 사용된 요인 및 세부변수(독립변수)로는 위험(보안 및 신분보장, 리스크감소), 효율(비용절감, 품질향상), 상호연계성(업체의 신뢰도, 전문기술력)으로 구성하였으며 종속변수인 아웃소싱 성공도에 미치는 영향을 분석하였다.
Development of Trail Walking Shoes by Using Biomechanical Evaluation
Seung-Bum Park,Kyung-Deuk Lee,Dae-Woong Kim,Jung-Hyeon Yoo,Kyung-Hun Kim,Stefanyshyn Darren,Fukuchi Claudiane,Palhano Rudnei,Worobets Jay 대한인간공학회 2012 대한인간공학회 학술대회논문집 Vol.2012 No.5
Objective: The purpose of this study was to measure the influence of the trail walking shoes on walking biomechanics (muscle activity, cushioning and joint loading) during hiking movements. Background: Hiking on hard, ragged, and rocky surface can cause foot injury, furthermore, long-time hiking can aggravate foot fatigue. As hiking on uneven surface involves the risk of injury, wearing specially designed performance shoes is recommended. Method: Five male subjects completed a level walking movement while wearing three different hiking shoe conditions: a Control-A shoe, a Control-B shoe and the Normal shoe. Results: The knee joint loads are generally lower with the Normal shoes. Since these loads have been associated with the development of osteoarthritis in the knee joint, a reduction with the Normal is a strong positive effect. With the Normal shoe, some of the ankle joint loads were lower while some were higher than with the other shoes. The cushioning of the Normal shoes was similar to the other shoes tested. Peak forces in the medial and lateral direction were lower with the Normal shoe in comparison to the other shoes. Medio-lateral forces provide an indication of stability and the decreased peaks in these directions suggest that the Normal shoe provides good stability, which could be why the overall muscle activity while wearing the Normal shoe is generally decreased. Conclusion: The results of this study show that the Normal shoe had lower overall muscle activity during level walking when compared to the Control-B shoes, by as much as 3%.
해산물 가공폐수내 염분농도가 혐기성 최종생분해도와 유기물 다중분해속도에 미치는 영향
최용범(Yong Bum Choi),권재혁(Jae Hyouk Kwon),임재명(Jay Myung Rim) 大韓環境工學會 2010 대한환경공학회지 Vol.32 No.11
본 연구는 해산물 가공폐수를 대상으로 혐기성 미생물, S/I ratio (substrate/inoculum)와 염분농도에 따른 혐기성 최종 생분해도를 평가하였다. S/I ratio 0.9에서 혐기성 소화슬러지와 입상슬러지의 최종 생분해도는 각 72.0, 92.0%로 조사되었으며, 다중분해속도 상수 k1은 소화슬러지가 0.0478~0.1252 day-1, 입상슬러지는 0.0667~0.1709 day-1로 조사되어 입상슬러지가 해산물가공폐수의 혐기성 처리에 적합하였다. 혐기성 최종생분해도 실험을 통해 산정된 최적 S/I ratio는 0.9였으며, 염분농도에 따른 생분해도 실험 결과, 3,000 mgCl-/L 이하에서 85% 이상의 유기물 제거효율을 나타냈다. 다중분해속도 상수 k1은, 3,000 mgCl-/L 이하에서는 0.1603~0.1709 day-1, 6,000 mgCl-/L 이상에서 0.0492~0.0760 day-1로 산정되었으며, k2는 6,000 mgCl-/L 이하에서는 0.0183~0.0348 day-1, 9,000 mgCl-/L에서는 0.0154 day-1로 조사되어, 반응속도 상수(k1, k2)는 Cl- 농도가 증가할수록 감소하였으며, 빠르게 분해되는 유기물 비율(S1)과 분해속도 또한 감소시키는 것으로 조사되었다. In this study, the anaerobic ultimate biodegradability and multiple decay rate of organic matter were evaluated according to various salt concentrations in seafood processing wastewater. The evaluation was also performed with various types of anaerobic bacteria and S/I (substrate/inoculum) ratios. After the S/I ratio was fixed at 0.9, the ultimate biodegradability values of the anaerobic digested sludge and granular sludge were became 72.0% and 92.0%, respectively. The multiple decay rate coefficients (k1) coefficients of the anaerobic digested sludge and granular sludge were 0.0478~0.1252 day-1 and 0.0667~0.1709 day-1, respectively. The optimum S/I ratio of the seafood wastewater, which was determined based on the ultimate anaerobic biodegradability and gas production, was 0.9. The organic matter removal rate never became less than 85.0% under a 3,000 mg/L chloride concentration. The multiple decay rate coefficients (k1) were 0.1603~0.1709 day-1 under 3,000 mgCl-/L, and 0.0492~0.0760 day-1 in more than 6,000 mgCl-/L. The multiple decay rate coefficients (k2) were 0.0183~0.0348 day-1 under 6,000 mgCl-/L, and 0.0154 day-1 at 9,000 mgCl-/L. With increasing chloride concentrations, the reaction rate (k1, k2) and ratio of the rapidly degraded organic matter (S1) decreased.