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홍성제(Sung-Jei Hong),김종웅(Jong-Woong Kim),이성원(Sung-Won Lee),홍태환(Tae-Hwan Hong),한정인(Jeong-In Han) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.11
본 연구에서는 초미세급 산화 실리콘(SiO₂) 나노 분말을 합성하였고, 이를 이용하여 페이스트 제조, 프린팅 및 열처리 후 제조된 필름의 절연 특성을 연구하였다. SiO₂ 나노분말의 경우 기존의 Cl?, F? 등 유해성분을 배제한 청정 공정으로 합성하였고, 열처리 온도도 기존보다 낮은 300℃에서 합성하였다. 분말 입자를 합성한 결과 입도가 15 ㎚ 이하, 비표면적은 약 200 ㎡/g의 물성을 가진 초미세급의 SiO₂ 나노 분말 입자가 합성되었다. 또한, 합성된 분말을 이용하여 SiO₂ 페이스트를 제조한 결과 30 wt% 농도의 SiO₂ 분말이 페이스트 내에 균일하게 분산되었다. 제조된 페이스트를 유리 기판 상에 프린팅 후 열처리한 결과 절연 저항 특성이 10¹¹ Ω 이상으로 절연 특성이 양호한 SiO₂ 프린팅 필름을 얻을 수 있었다.
무연 솔더가 적용된 자동차 전장부품 접합부의 열적.기계적 신뢰성 평가
하상수,김종웅,채종혁,문원철,홍태환,유충식,문정훈,정승부,Ha, Sang-Su,Kim, Jong-Woong,Chae, Jong-Hyuck,Moon, Won-Chul,Hong, Tae-Hwan,Yoo, Choong-Sik,Moon, Jeong-Hoon,Jung, Seung-Boo 대한용접접합학회 2006 대한용접·접합학회지 Vol.24 No.6
This study was focused on the evaluation of the thermo-mechanical board-level reliability of Pb-bearing and Pb-free surface mount assemblies. The composition of Pb-bearing solder was a typical Sn-37Pb and that of Pb-free solder used in this study was a representative Sn-3.0Ag-0.5Cu in mass %. Thermal shock test was chosen for the reliability evaluation of the solder joints. Typical $Cu_6Sn_5$ intermetallic compound (IMC) layer was formed between both solders and Cu lead frame at the as-reflowed state, while a layer of $Cu_3Sn$ was additionally formed between the $Cu_6Sn_5$ and Cu lead frame during the thermal shock testing. Thickness of the IMC layers increased with increasing thermal shock cycles, and this is very similar result with that of isothermal aging study of solder joints. Shear test of the multi layer ceramic capacitor(MLCC) joints was also performed to investigate the degradation of mechanical bonding strength of solder joints during the thermal shock testing. Failure mode of the joints after shear testing revealed that the degradation was mainly due to the excessive growth of the IMC layers during the thermal shock testing.
물질전과정평가(MLCA)를 통한 TiN 복합수소 분리막의 환경성 평가
김민겸 ( Min Gyeom Kim ),한정흠 ( Jeong Heum Han ),이영환 ( Young Hwan Lee ),손종태 ( Jong Tae Son ),홍태환 ( Tae Whan Hong ) 한국전과정평가학회 2018 한국전과정평가학회지 Vol.19 No.1
In this study, Material life cycle evaluation was performed to analyze the environmental impact characteristics of TiN-Zr membrane manufacturing process. The software of MLCA was Gabi. Through this, environmental impact assessment was performed for each process. Transition metal nitride have been researched extensively because of their properties. Among these, TiN has the most attention. TiN is a ceramic materials which possess the good combination of physical and chemical properties, such as high melting point, high hardness, and relatively low specific gravity, high wear resistance and high corrosion resistance. With these properties, TiN plays an important role in functional materials for application in separation hydrogen from fossil fuel. Precursor TiN was synthesized by sol-gel method and zirconium was coated by ball mill method. The metallurgical, physical and thermodynamic characteristics of the membranes were analyzed by using Scanning Electron Microscope (SEM), X-ray Diffraction (XRD), Gas Chromatograph System. As a result of characterization and normalization, environmental impacts were 94% in MAETP (Marine Aquatic Ecotoxicity), 2% FAETP (Freshwater Aquatic Ecotoxicity), 2% HTP (Human Toxicity Potential). TiN fabrication process appears to have a direct or indirect impact on the human body. It is believed that the greatest impact that HTP can have on human is the carcinogenic properties. This shows that electricity use has a great influence on ecosystem impact. TiN-Zr was analyzed in Eco-Indicator ‘99 (EI99) and CML 2001 methodology.
계태에서의 31P 자기공명분석법을 이용한 인대사변화의 추적
홍창의,임태환,이정희,이대근,유시준 울산대학교 의과대학 1994 울산의대학술지 Vol.3 No.2
Chick embryo is a convenient model for embryologic teratologic studies. We performed the present experimental study to establish the basic technology for magnetic resonance studies of chick embryos and to examine the biochemical changes occurring during the development of chick embryos. Fertilized Leghorn eggs were examined by 31-phosphours magnetic resonance spectroscopy (??P-MRS) on days 6, 9, 12, 14, 15, 17 and 20 after the start of incubation. Spectroscopic data of live embryos were acquired by using a 4.7T MR spectrometer, and signals from phosphorous metabolites were analyzed. Total phospholipid signal decreased, which resulted in the overall decrease in total phosphorous signal over time. Signals from other metabolites such as ATPs and phosphocreatine increased over time, while those from inorganic phosphate and sugar phosphates decreased. Before the incubation days 12, signals from sugar phosphates and inorganic phosphate were predominant, and other metabolites became remarkably functional between the days 12 and 14 when the decrease in the phospholipid signal was significant. MR specrtroscopy is an effective method in evaluation of the biochemical changes occurring during the developmental period of chick embryos.