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김민찬,양한광,김영우,김용일,김응국,김형호,박경규,배재문,백홍규,설지영,신석환,이윤복,이종명,Kim, M.C.,Yang, H.K.,Kim, Y.W.,Kim, Y.I.,Kim, E.K.,Kim, H.H.,Park, K.K.,Bae, J.M.,Baik, H.G.,Sul, J.Y.,Shin, S.H.,Lee, Y.B.,Lee, J.M. 대한위암학회 2004 대한위암학회지 Vol.4 No.3
The Information Committee of the Korean Gastric Cancer Association sent questionnaires to 31 laparoscopic gastric surgeons about their personal experiences with laparoscopic gastric surgery from 2001 to 2003. Twenty-four surgeons responded to the questionnaires (response rate: $77.4\%$).The number of laparoscopic gastric surgeries from 2001 to 2003 was 1,130 and increased from 209 in 2001 to 593 in 2003. The number of operations for a gastric adenocarcinoma also increased from 87 cases in 2001 to 403 cases in 2003. Laparoscopic radical procedures, such as a laparoscopyassisted distal gastrectomy or total gastrectomy (LADG or LATG), have increased rapidly during this period. (55 cases in 2001, 150 cases in 2002, and 364 cases in 2003). Laparoscopic function-preserving gastrectomies were not performed until 2003, during which year one pylorus- preserving gastrectomy and six proximal gastrectomies were performed laparoscopically. A wedge resection for a gastric submucosal tumor was performed in 71 cases in 2001, 82 in 2002, and 103 in 2003. Hand-assisted laparoscopic surgery (HALS) was performed in 39 cases in 2001, 55 in 2002, and 49 in 2003. As for personal indications for a LADG, 14 surgeons performed a LADG only for a T1 lesion, and 5 surgeons extended their indications to T2N0 lesions. In the near future, laparoscopic procedures for gastric cancer will be widely adopted in Korea if the medical-insurance obstacle is overcome and the long-term survival results are verified.
지르코니아 분말의 치밀화와 소결거동 : II. 소결거동
박홍채,김겸,김영우,이윤복,오기동,Park, H.C.,Kim, K.,Kim, Y.W.,Lee, Y.B.,Oh, K.D.,Riley, Frank L. 한국세라믹학회 1993 한국세라믹학회지 Vol.30 No.6
Sintering behaviour of zirconia powders prepared by different processing treatment was discussed. About >99% densities of theoretical were obtaiend on sintering at 140$0^{\circ}C$ for 2h in case of 300MPa uniaxially cold-pressed compact. But the lower densities were obtained on sintering above this temperature due to abnormal grain growth enabling the tetragonal to monoclinic phase transformation during cooling resulted in microcracks. All kinds of different dried powders exhibited nearly the same shrinkage behaviour with end-point shrinkage between 19 and 20%, and had maximum shrinkage rate (0.99~1.27%/min) around 120$0^{\circ}C$. During whole sintering process densification was mainly governed by grain growth and rearrangement of agglomerates. Heterogeneous abnormal grain growth and abrupt decrease in shrinkage were observed when continuous interagglomerate pore collapsed into isolated pores.
카올린을 이용한 물라이트 세라믹스의 제조 : Al₂O₃첨가 영향 Effects of Al₂O₃ additives
장윤식,박성수,오기동,이윤복 釜山大學校生産技術硏究所 1995 生産技術硏究所論文集 Vol.49 No.-
카올린에 알루미나를 첨가하여 물라이트 세라믹스를 제조하고 이의 결정상의 변화 및 소결성을 조사하였다. 가열된 시편의 결정상은 물라이트, 코런덤, 크리스토발라이트로 동정되었고 1400℃이상의 온도에서 72wt%AI₂O₃를 함유한 시편 M-1은 물라이트 고용체를 형성하였지만 77wt%AI₂O₃를 함유한 M-2는 물라이트와 코런덤, 82wt%AI₂O₃를 함유한 M-3의 경우는 물라이트, 코런덤, 크리스토발라이트로 동정되었다. 이러한 결정상들 중에서 물라이트는 가열온도가 증가함에 따라 그 생성량은 증가하였고 코런덤 및 크리스토발라이트는 감소하였다. M-1, M-2, M-3의 수축율은 1500℃부근에서 가열에 따른 수축율이 급격히 변하여 1600℃에서의 최종수축율은 각각 12.5, 12.8, 15.6%였다. 치밀화에 따른 소결체의 밀도는 AI₂O₃의 무게비가 증감함에 따라 증가하였고, 1600℃에서 M-3의 경우 최종소결밀도는 3.08g/㎤ 였다. Mullite ceramics were prepared from kaolin with the content of AI₂O₃and the change of crystal phase and the sinterability were investigated. The crystalline of samples were identified as mullite, corundom, cristobalite. M-1 specimen containing 72 wt% AI₂O₃formed mullite solid solution but M-2 specimen containing 77 wt%AI₂O₃, mullite and corundom, M-3 specimen containing 82wt%AI₂O₃mullite, corundom, cristobalite at more than 1400℃. The content of mullite increased with heating temperature but that of cristobalite and corundom decreased. Shrinkage of M-1, M-2, M-3 rapidly changed at about 1500℃ and the final shrinkage were respectively 12.5%, 12.8%, 15.6% at 1600℃. Bulk density increased with the weight ratio of AI₂O₃in these sample and the final density of M-3 was 3.08g/㎤ at 1600℃
이윤복,오기동,박홍채 釜山大學校生産技術硏究所 1996 生産技術硏究所論文集 Vol.51 No.-
코디어라이트 분말의 성형성에 미치는 결합제와 건조에 따른 함수율 및 수축성을 검토하였다. 성형압을 300㎏/㎠로 가압시 25%물을 함유한 0.2%CMC와 15%물을 함유한 15% SAN-X의 성형밀도가 2.19g/㎤로 가장 높았다. 0.2%PVA는 0.5% SAN-X, 0.2%CMC에 비교하여 성형압력에 대한 성형밀도 변화가 크게 나타났다. 0.2%CMC는 24시간 숙성시 성형밀도가 2.09g/㎤에서 2.17g/㎤로 증가하다가 그 이상의 숙성시간에서는 거의 일정하였다. 대부분의 성형체를 36시간 건조시 결합제의 종류에 관계없이 함수율은 감소하였고, 그 이상의 건조시간에서는 일정하였다. 또한 건조시간에 따른 수축율의 변화는 없었다. The influence of binder and free-water content of the compaction and shrinkage behaviors was discussed. The green densities of 300㎏/㎠-pressed compacts with 0.2%CMC containing 25% free-water and 0.5% SAN-X containing 15% free-water showed the highest value of 2.19g/㎤. The change in green density of 0.2%PVA compacts was large, compared to 0.5% SAN-X and 0.2%CMC compacts under applied pressure. After aging 0.2%CMC powders for 24h, the green density of its compacts was increased from 2.09g/㎤ to 2.17g/㎤ and was constant with aging for 72h. The change of shrinkage of 36h-dried compacts was none. However, the free-water content slowly decreased regardless to the kinds of binder.
이윤복,권상오,장윤식,박상희,오기동 부산대학교 1995 生産技術硏究所論文集 Vol.48 No.-
MgO-Al₂O₃계에서 MgO첨가량에 따른 스피넬의 생성과 소결성을 조사하였다. 아울러 스피넬 내화물과 시멘트를 구성하는 주성분인 CaO의 반응성에 대하여 검토하였다. 가열된 시편의 상은 대부분의 스피넬, 페리클레이스 및 코런덤으로 동정되었고 과잉의 MgO를 함유한 시편의 경우 1750℃에서는 잔류 코런덤은 확인되지 않았다. MgO 함량이 감소함에 따라 스피넬내에 Al₂O₃의 고용에 기인된 스피넬의 생산량은 증가하는 경향을 나타내었다. 과잉의 MgO를 함유한 시편은 1600℃에서 치밀화가 촉진되어 1750℃, 5시간 유지한 시편의 경우 최종 소결밀도는 3.51g/㎤였다. 1750℃, 5시간 유지한 시편을 회전침식시험한 결과, 과잉의 MgO를 함유한 시편의 경우 침식깊이가 8.2mm, 침식면적이 225㎟로 다른 시편에 비교하여 가동면에서 CaO에 대한 침식저항성이 우수하였다. Effects of MgO content in spinel formation and sintering behavior of MgO-Al₂O₃ system were investigated. The reactivity of CaO in spinel refractories was also studied. From phase analyse, the refractories composed of mainaly two phase as like periclase and spinel, and residual corundom. However, the residual corundum was almost disappeared as it was fired at 1750℃ with excess of MgO. As the amount of MgO was reduced, the formation of spinel increased due to solid solubility of Al₂O₃ in spinel. The sample with excess of MgO markedly promoted the densification of spinel at 1600℃. The density of sample fired at 1750℃ for 5h was 3.51g/㎤. In rotary corrosion test, the sample with excess of MgO content, which had 8.2mm in the corrosion depth and 225㎟ in the corrosion area showed excellent corrosion resistance against the reactivity of CaO on the surface of spinel refractories.
석탄회의 재활용을 통한 반응소결 뮬라이트(3Al₂O₃ㆍ2SiO₂) 세라믹스의 개발
정정식,양태영,이윤복,오기동,박홍채 부산대학교 생산기술연구소 2000 生産技術硏究所論文集 Vol.58 No.-
석탄회를 출발물질로 사용하고 여분의 알루미나를 첨가하여 양론조성비(Al2O31SiO2=3/2, 몰비)를 갖는 뮬라이트 세라믹스를 반응소결법에 의해서 제조하고, 이의 상분석, 부피밀도, 기공율, 흡수율, 미세구조 및 기계적 성질을 검토하였다. 뮬라이트화는 크리스토바라이트와 α-알루미나의 반응에 의해서 1400℃에서 거의 종료되었다. 1600℃ 반응소결에 의해서 수축을 10.2%, 기공을 1.4%, 흡수율 0.5%를 갖는 서로 연결된 다량의 각주형상의 결정을 갖는 치밀질 뮬라이트 소결체가 제조되었으며, 이의 꺾임강도와 파괴인성은 각각 360MPa와 2.6 MPa · m1/2이 었다. Stoichiometric mullite(Al2O31SiO2=3/2, molar ratio) ceramics have been fabricated by reaction-sintering coal fly ash with a addition of alumina and the resulting materials have been chaiacterized in terms of phase, bulk density, porosity, water absorption, microstructure and mechanical properties. Mullitization was nearly completed by the reaction of cristobalite and α-alumina at ∼1400℃. After reaction sintering at 1600℃, a dense sintered mullite with interlinked elongated crystals exhibited shrinkage of 10.2%, porosity of 1.4%, water absorption of 0.5%, bend strength of 360 MPa and toughness of 2.6 MPa · m1/2.