http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
STS/Al/Cu 클래드재의 파괴거동 및 기계적 물성에 미치는 인장시험 온도의 영향
배동현 ( Dong Hyun Bae ),최영준 ( Young Jun Choi ),정원섭 ( Won Sub Chung ),배동수 ( Dong Su Bae ),조영래 ( Young Rae Cho ) 대한금속·재료학회 2009 대한금속·재료학회지 Vol.47 No.12
In order to meet increasingly complex and rigorous technical specifications, extensive effort has been devoted to fabricate clad materials with multi-layered metal plates. In this study, novel stainless steel/aluminum/copper (STS/Al/Cu) three-ply clad materials were fabricated by a hot rolling process for cookware applications. The effect of the testing temperature on the mechanical properties of the clad materials and on each component metal was investigated during the tensile tests. The interface properties of the clad materials were also examined by optical microscopy (OM) and an electron probe micro-analyzer (EPMA). The best mechanical and interfacial properties for a warm working process were found in a sample annealed at a temperature of 300℃. For the sample annealed at 400℃, the results of the tensile test indicated that interface delamination occurred only in the region of the Al/Cu interfaces. This was due to the formation of the thick and brittle intermetallic compound of Al2Cu in the Al/Cu interface. In contrast, no interface delamination was observed in the STS/Al interface, most likely due to its strong bond strength.
Ti/Al/STS 클래드재의 접합특성에 미치는 예비 열처리의 영향
배동현 ( Dong Hyun Bae ),정수정 ( Su Jung Jung ),조영래 ( Young Rae Cho ),정원섭 ( Won Sup Jung ),정호신 ( Ho Shin Jung ),강창룡 ( Chang Yong Kang ),배동수 ( Dong Su Bae ) 대한금속·재료학회 2009 대한금속·재료학회지 Vol.47 No.9
Titanium/aluminum/stainless steel(Ti/Al/STS) clad materials have received much attention due to their high specific strength and corrosion-resisting properties. However, it is difficult to fabricate these materials, because titanium oxide is easily formed on the titanium surface during heat treatment. The aim of the present study is to derive optimized cladding conditions and thereupon obtain the stable quality of Ti/Al/STS clad materials. Ti sheets were prepared with and without pre-heat treatment and Ti/Al/STS clad materials were then fabricated by cold rolling and a post-heat treatment process. Microstructure of the Ti/ Al and STS/Al interfaces was observed using a Scanning Electron Microscope(SEM) and an Energy Dispersed X-ray Analyser(EDX) in order to investigate the effects of Ti pre-heat treatment on the bond properties of Ti/ Al/STS clad materials. Diffusion bonding was observed at both the Ti/Al and STS/Al interfaces. The bonding force of the clad material with non-heat treated Ti was higher than that with pre-heat treated Ti before the cladding process. The bonding force decreased rapidly beyond 400℃, because the formed Ti oxide inhibited the joining process between Ti and Al. Bonding forces of STS/Al were lower than those of Ti/Al, because brittle Fe3Al, Al3Fe intermetallic compounds were formed at the interface of STS/Al during the cladding process. In addition, delamination of the clad material with pre-heat treated Ti was observed at the Ti/Al interface after a cupping test.
C/SiC 복합재의 기계적 특성에 미치는 초기 기공의 영향
손동영(Son Dong-Young),배동현(Bae Dong-Hyun),손용규(Son Young-Gyu),배동수(Bae Dong-Su) 동의대학교 정보통신연구소 2004 정보통신연구지 Vol.5 No.-
Four kinds of raw C/C composites with a density between 1.2S-1.66g/cm² were used in order to investigate the effect of the initial porosity of C/C composites on mechanical properties of liquid silicon infiltrated C/SiC composites. The microstructure observation, image analysis and flexural strength test of the composites were performed. The density and microstructural changes with the variation of the initial porosity was discussed in the terms of the infiltration behavior of liquid silicon.
액상 Si 함침 공정에 의해 제조된 C/SiC 복합재의 고온부식거동
손동영(Son Dong-Young),배동현(Bae Dong-Hyun),손용규(Son Young-Gyu),배동수(Bae Dong-Su) 동의대학교 정보통신연구소 2004 정보통신연구지 Vol.5 No.-
Raw C/C composite was used in order to investigate the effect of the erosion behavior of the C/C composite manufactured by the melt silicon infiltration process at the high temperature. The microstructure observation, image analysis and flexural strength test of the composite was performed. The density and microstructural changes with the variation of the initial porosity was discussed in the terms of the reaction between liquid silicon and matrix carbon.
난소 종양의 양성과 악성을 감별하기 위한 새로운 점수 체계의 고안
조인숙 ( In Sook Cho ),남계현 ( Kye Hyun Nam ),이해혁 ( Hea Hyuk Lee ),김정식 ( Jung Sik Kim ),김태희 ( Tae Hee Kim ),조희정 ( Hee Jung Cho ),정수호 ( Soo Ho Jung ),이권해 ( Kwon Hae Lee ),배동한 ( Dong Han Bae ) 대한산부인과학회 2006 Obstetrics & Gynecology Science Vol.49 No.8
목적: 이 연구의 목적은 초음파를 이용하여 난소 종양의 양성과 악성을 감별하기 위한 난소 종양 점수 체계의 효용성을 측정하여 새로운 점수 체계의 고안과 그 효용성을 평가하기 위한 것이다. 연구 방법: 난소 종양이 있는 환자 199명을 대상으로 하여 Alcazar, Ferrazi, Sassone, De Priest 및 새로 고안한 점수 체계(scoring system)을 이용하여 양성과 악성을 전향적으로 예측하였다. 악성은 23명이었고, 양성은 176명이었다. 본원에서 도안한 난소 종양의 점수 체계를 수신자 동작 곡선(receiver operation characteristic curve)을 이용하여 구한 절사점(cut-off level)은 11점이었다. 수술 후 병리 진단과 비교하여 각각의 민감도, 특이도, 양성 예측율과 음성 예측율을 구하여 임상적 효용성을 알아보았다. 결과: 본원에서 고안한 점수 체계는 종양의 벽의 두께, 중격의 수, 종양의 부피, 불규칙한 면의 유무, 혈류의 존재, 고음영을 요소로 하였다. 종양의 벽의 두께에 따라 나누어 다른 동일한 요소의 점수를 다르게 하였다. 새로 고안한 점수 체계를 이용하였을 때 민감도와 특이도는 각각 73.9%와 97.7%였으며, 양성 예측율과 음성 예측율은 각각 80.9%와 96.6%였다. 결론: 새로 고안한 점수 체계를 이용하여 측정하였을 때 민감도는 기존의 방법과 비슷하였으나 특이도는 향상되었다. 따라서 난소의 종양의 악성 여부 평가에 유용한 방법으로 사용될 수 있을 것으로 보인다. Objective: The purpose of this study was to design a new scoring system for differentiation between benign and malignant ovarian masses and to assess effectiveness of new scoring system comparing other scoring systems. Methods: This study was based on 199 women who visited Soonchunhyang Hospital for surgery of ovarian mass. Ultrasonography and scoring system based on De Priest, Sassone, Ferrazi and Alcazar was performed the day before operation. Pathologic diagnosis after operation was directly compared with diagnosis of scoring system. The cut-off level of the new index is 11 points. This study was evaluated by sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV). Results: Parameters of new scoring system were wall thickness, number of septum, volume of mass, irregularity, vascularity and echogenicity. The new scoring system had sensitivity 73.9%, specificity 97.7% and negative and positive predictive values of 96.6% and 80.9% respectively. Conclusion: Sensitivity of new scoring system was similar to previous ones but specificity of that is higher. Our new scoring system shows better to differentiate benign from malignant ovarian mass than four other scoring systems.
박보라 ( Bo Ra Park ),전섭 ( Seob Jeon ),배동한 ( Dong Han Bae ),남계현 ( Gye Hyun Nam ),정동준 ( Dong Jun Jeong ) 대한산부인과학회 2012 Obstetrics & Gynecology Science Vol.55 No.1
Papillary squamotransitional cell carcinoma (PSTCC) of vagina is not a common disease. Especially primary neoplasm, which is not associated with carcinoma of urinary tract is very rare. To our knowledge, there have been only three reported cases of primary vaginal PSTCC without the history of urothelial carcinoma. Here, we report primary vaginal PSTCC accompanied by cervical squamous carcinoma in situ without the history of urothelial carcinoma with brief review of literature.
압연 클래드된 Ti/Mild steel/Ti 재의 계면확산층과 접합력에 미치는 후열처리온도의 영향
이상목 ( Sang Mok Lee ),김수민 ( Su Min Kim ),위세나 ( Se Na We ),배동현 ( Dong Hyun Bae ),이근안 ( Geun An Lee ),이종섭 ( Jong Sup Lee ),김용배 ( Yong Bae Kim ),배동수 ( Dong Su Bae ) 대한금속재료학회 ( 구 대한금속학회 ) 2012 대한금속·재료학회지 Vol.50 No.4
The aim of this study is to investigate the effect of post heat treatment on bonding properties of roll cladded Ti/MS/Ti materials. First grade Ti sheets and SPCC mild steel sheets were prepared and then Ti/MS/Ti clad materials were fabricated by a cold rolling and post heat treatment process. Microstructure and point analysis of the Ti/MS interfaces were performed using the SEM and EDX Analyser. Diffusion bonding was observed at the interfaces of Ti/MS. The thickness of the diffusion layer increased with post heat treatment temperature and the diffusion layer was verified as having (ε+ζ)+(ζ+β-Ti) intermetallic compounds at 700℃ and an (ζ+β-Ti) intermetallic compound at 800℃, respectively. The micro Knoop hardness of mild steel decreased with post heat treatment temperature; however, those of Ti decreased at a range of 500~600 ℃ and showed a uniform value until 800℃ and then increased rapidly up to 900℃. The micro Knoop hardness value of the diffusion layer increased up to 700℃ and then saturated with post heat treatment. A T-type peel test was used to estimate the bonding forces of Ti/Mild steel interfaces. The bonding forces decreased up to 800℃ and then increased slightly with post heat treatment. The optimized temperature ranges for post heat treatment were 500~600℃ to obtain the proper formability for an additional plastic deformation process.