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이중명(Jung Myoung Lee),안은별(Eun-Byeol Ahn),최효석(Hyo-Seok Choi),류지애(Ji-Ae Ryu),엄태진(Tae-Jin Eom) 한국펄프·종이공학회 2018 펄프.종이技術 Vol.50 No.5
We compared the characteristics of the three LMCFs (lignin rich micro-cellulosic fines) prepared by microwave irradiation, oil bath treatment and high pressure steam treatment from pine wood powder. The residual lignin contents of the LMCFs prepared by the three methods were almost similar but the yields were different. The microwave irradiation method hydrolyzed the pine wood powder more greatly compared to the other methods. So, the LMCFs prepared by microwave irradiation showed the lowest particle size and the least amount of hydroxyl groups but, showed the highest total crystallinity index. It was found that the LMCFs prepared by the three methods were similar in morphology but different in content of aromatic ring and carbonyl group. Based on these results, LMCFs could be produced efficiently depending on the manufacturing time, energy cost, and uniformity of micronized samples. It was concluded that the high pressure steam treatment method, which produces the uniform production of LMCFs as the purpose, is the optimum micronization method.
이중명(Jung Myoung Lee) 한국펄프·종이공학회 2018 펄프.종이技術 Vol.50 No.5
Microwave irradiation is one of pretreatment technologies in the biorefinery area. In this paper, we carried out a comparative study of the two distinct bio-based materials such as pine and eucalyptus as feedstocks subjected to a combination treatment of microwave irradiation and chemical micronization at a given reaction severity. The micronized residues were characterized in terms of reaction yields, residual lignin contents, sugar compositions, crystallinity, and dissolution behaviors on a aqueous Urea/NaOH solution. It was found that hardwood under the combination treatment of microwave and chemical micronization is more sensitive than softwood, resulted to a rapid decrease in yields, and residual lignin contents. The pronounced losses of hemicellulose and lignin in the hardwood made easily soluble in the aqueous Urea/NaOH solution.
금속 비구컵 보강환(Acetagular reinforcement ring)을 이용한 인공 관절 전치환술의 비구 골결손의 치료
이중명 ( Joong Myung Lee ),조덕연 ( Duck Yun Cho ),이종범 ( Jong Beom Lee ) 대한고관절학회 1992 Hip and Pelvis Vol.4 No.1
Deficiency of acetabular rim and acetabular wall presents a difficult problem in total hip arthroplasty. Main causes of acetabular defect are aseptic loosening of the acetabular component, acetabular dysplasia, rheumatoid or other type of severe arthritis, large bone cyst or bone tumor, defect after trauma and acetabular defects must be supported to engage the acetabular cup. Many authors have been managed this problem using the various methods such as bone cement, autogenous or allogenous bone graft and bipolar endoprosthesis with or without acetabular ring, wire mesh. To reconstruct the normal center of rotation of the acetabulum, allograft or autogenous graft with acetabular rein forcea:ent ring and cement fixation have been done in twelve patients. Preoperative and postoperative hip joint functions by Harris hip score was increased from average 50.7 to 95.9 (Average follow up: 2 years 3 months). In one case, autogenous bone graft collapse without cup failure was noted. The other allograft or autografted bone was healed completely without evidence of collapse. Reconstruction of acetabular bone defect with acetabular reinforcement ring combined with allograft or autogenous bone graft is useful method especially, in case that large bone defect remains in the acetabular bed, in senile or rheumatic osteoporotic patient with bone defect.
이중명(Joong Myung Lee),박용순(Yong Soon Park),조덕연(JDuck Yun Cho) 대한고관절학회 1999 Hip and Pelvis Vol.11 No.3
For a comparison study, patients with bilateral late-stage osteonecrosis were prospectively and ran-domly treated with bilateral total hip arthroplasty(THA) using two different types of the cementless Spotorno (CLS) femoral stem in same patients. In each patient, a standard femoral stem, which had a rough blasted surface was used on one side, while an identical stem with a proximal hydroxyapatite (HA) coating was used on the other side. The Harris-Galante II cup was used on the acetabular side. The same-sized prostheses were used bilaterally. Clinical & radiologic results of 18 patients (36 hips) were evaluated after a minimum follow-up of five years. According to Merle d ’Aubigne and Postel score modified by Charnley, there was no significant difference between the two groups. Pain was improved from an average of 2.5 to 5.6. The movement of hip was improved from an average of 3.5 to 5.6. The ability to walk was improved from an average of 3.8 to 5.7. The HA-coated stem showed a proximal radiolucent line in 1 hip, which was stabilized by the endosteal bone formation in the middle & distal zones. The reactive line of the distal zone, which had been shown in the short term follow up study (2 years) of the HA coated stem, had changed to endosteal bone formation. The endosteal bone formation was not significantly different between the two groups and evenly distributed around the middle & distal zones(p>0.05). The other parameters, also showed no statically significant differences between the two groups. A blasted surface itself appeared to be enough to get a good fixation. We think that HA coating should be used with care in any previously used designs, due to possible long-term problems.
Bencox® Hip Stem을 이용한 인공 고관절 치환술의 최소 5년 추시 결과
이중명,전재범 대한정형외과학회 2014 대한정형외과학회지 Vol.49 No.2
Purpose: The purpose of this study is to report the results of artificial hip arthroplasty with minimum five-year follow-up using the Bencox® (Corentec) hip stem, the first total hip prosthesis developed in Korea. Materials and Methods: We evaluated 27 hips in patients with femoral neck or intertrochanteric fracture (fracture group) and 58 hips in patients with arthritis or osteonecrosis of the femoral head (arthritis group) who underwent hip arthroplasty using a Bencox® hip stem in combination with Bencox® bipolar cup and Bencox® acetabular cup between September 2006 and February 2008. Patients in the fracture group underwent bipolar hip arthroplasty, and those in the arthritis group underwent total hip arthroplasty. Results: During the follow-up period, there were no cases of revision of the femoral stem. Mean Harris hip score was 94 at the latest follow-up in (femoral neck or intertrochanteric) the fracture group, and improved from 57 preoperatively to 98 at the latest follow-up in the arthritis (or avascular necrosis) group. Radiographically, endosteal bone ongrowth was found in 23 of 27 cases in the fracture group (85.2%) and 56 of 58 cases in the arthritis group (96.6%). Stem loosening, infection, dislocation, and ceramic breakage were not noted. Conclusion: Clinical and radiographic evaluations of hip arthroplasty using the Bencox® hip stem showed excellent outcomes with a minimum of five-year follow-up.
< 전시-P-92 > 3D 프린터용 MFC 필라멘트의 제조
이중명 ( Jung Myoung Lee ),박지수 ( Ji-su Park ),안지효 ( Ji-hyo Ahn ),류지애 ( Ji-ae Ryu ),최사랑 ( Sa-rang Choi ),안은별 ( Eun-byeol Ahn ),서은지 한국목재공학회 2019 한국목재공학회 학술발표논문집 Vol.2019 No.1
3D 프린팅은 고체, 액체 및 분말 형태의 소재를 분사 혹은 적층하여 3차원 입체물을 제조하는 방식을 사용함에 따라, 지난 수 년 동안 산업분야 뿐만 아니라 일반 대중에 대한 3D 프린팅의 접근성이 크게 증가하였다. PLA(polylactic acid)는 우수한 기계적 성질, 재생 가능성, 생분해성 그리고 상대적으로 저렴한 비용을 가지고 있는 대표적인 바이오폴리머(biopolymer)로 3D 프린터용 필라멘트의 원료로 사용되며 석유화학 유래의 고분자 재료를 대체할 수 있는 대안으로 떠오르고 있다. 반면, PLA와 같은 생분해성 고분자는 충격저항이 낮고 밀도가 높기 때문에 포장 및 건축 사업과 같은 응용 분야에서 제한적으로 이용되고 있다. 따라서 본 연구는 MFC와 리그닌 첨가에 따른 3D 프린터용 필라멘트 물성을 비교하기 위해 수행되었다. MFC와 리그닌 모두 분말 형태로 제조하여 PLA 대비 0.5, 1, 2., 5 wt%로 투입하였으며 사용된 PLA는 진공 건조하여 사용하였다. 혼합 시료는 사출기의 150℃-160℃사이로 제조하여 인장강도를 측정하였으며 MFC와 리그닌의 분산성을 알아보기 위해 시료의 표면 및 단면을 관찰하였다. 그 결과 사출 온도에 따른 인장강도의 차이를 관찰하였으며 150℃에서 필라멘트를 제조하였을 때 MFC와 리그닌의 모든 조건에서 PLA만으로 제조한 필라멘트보다 높은 인장강도를 나타내었다. 또한 리그닌을 첨가함에 따라 인장강도가 감소하는 경향을 나타냈으며 MFC 첨가량에 따른 강도 차이는 그게 나타나지 않았다.