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그래핀/사파이어 기판상에 스퍼터링 후 열처리된 VO<sub>2</sub>박막의 구조 및 광학적 특성변화 연구
김근수,김형근,김예나,한승호,배동재,양우석,Kim, Keun Soo,Kim, Hyeongkeun,Kim, Yena,Han, Seung-Ho,Bae, Dong Jae,Yang, Woo Seok 한국진공학회 2013 Applied Science and Convergence Technology Vol.22 No.2
이산화바나듐($VO_2$)는 써모크로믹(thermochromic) 물질로서 온도변화에 따른 구조적 상전이에 의해 전기적, 광학적 특성을 스위칭 할 수 있는 매력적인 소재이며, 최근 신소재로써 그 연구가 활발한 그래핀 역시, 전기적으로나 광학적으로 그 특성이 우수하여 투명전극에 관한 연구가 아주 활발하게 진행되고 있다. 이에 우리는 $VO_2$와 그래핀 두 가지 소재를 접목했을 경우 나타나는 현상을 그래핀의 층 수와 온도를 변수로 하여 형성된 박막의 구조와 광학적 특성을 측정하고 분석하였다. 본 연구 결과에 따르면 그래핀 필름이 전사된 사파이어 기판 위에 형성된 $VO_2$ 박막의 표면구조 및 특성이 bare 사파이어 기판 위의 $VO_2$ 박막보다 그레인이 작고 밀도가 높아 균일하였으며, IR 영역에서의 광투과도 역시 그래핀 필름이 있을 경우 ~10% 정도 개선됨을 확인하였다. 아울러 평균상전이 온도를 낮출 수 있으며, 상전이 히스테리시스 변화폭 또한 좁아지는 것을 확인하였다. $VO_2$ is an attractive thermochromic material, in which its electrical and optical properties can be switched by the structural phase-transition about $68^{\circ}C$. Recently, graphene is also a rising material which is researched as a transparent electrode because of its superior electrical and optical characteristics. In this respect, we try to fabricate the hybridized films using $VO_2$ and graphene on transparent sapphire substrate and then we investigate a structure and characterize an optical property for the samples as a function of temperature. According to the result of IR-transmittance analysis of $VO_2$ films as a function of temperature, the graphene-supported sapphire substrates are better about 10% than the bare sapphire substrates. The mean phase transition temperatures are also decreased as the number of graphene-layers increased and the hysteresis of phase transitions are narrowed.
운송용 조종사의 조직시민행동 인식과 안전문화에 대한 연구
김근수,김기웅,최연철,최성수,Kim, Keun Soo,Kim, Kee Woong,Choi, Yeon Chul,Cho, Seong Soo 한국항공운항학회 2016 한국항공운항학회지 Vol.24 No.3
The purpose of this paper is to analyze the relationship between the perception of organizational citizenship behavior and that of safety culture by airline pilots. Finding factors which composed of organizational citizenship behavior, this paper will prove the effects of those factors to the safety culture of an airline. Organizational citizenship behavior means the activities of members, based on their free will, to enhance organization's overall productivity and performance, which are, however, not officially and apparently approved by the organization. Safety culture is to contain the concept in the organization's protocol, procedure and policy affecting safety performance of the organization. According to the analysis, it was proven compliance of organizational citizenship behaviors has a positive effect on safety culture through job satisfaction. Moreover, altruism and individual initiative have a direct positive effect on safety behavior of pilots.
김근수,Kim, Keun-Soo 대한용접접합학회 2013 대한용접·접합학회지 Vol.31 No.3
Sn whiskers are one of the serious causes of the failure of electronics. Sn whiskers grow spontaneously from Sn-based, lead-free finished surfaces, even at room temperature. A primary factor of these Sn whiskers growth is compressive stress, which enhances the diffusion of Sn or other elements. The sources of compressive stress are the growth of non-uniform large intermetallic compounds along the interface between the Sn grain boundary and Cu substrate. Recent studies revealed the methods for reducing Sn whisker growth. This paper gives an overview about recent researches for mitigation methods of Sn whisker growth during nearly room temperature storage.
김근수,Kim, Keun-Soo 한국마이크로전자및패키징학회 2012 마이크로전자 및 패키징학회지 Vol.19 No.4
The quality and performance of electronic parts and equipment are affected by various types of stresses. Thermal stress caused by changes in the ambient usage environment and mechanical stress from vibration shock during transportation can degrade both quality and performance. This paper gives an overview about recent researches for measuring market environmental conditions of electronic equipments.
김근수,허석환,Kim, Keun-Soo,Suganuma, Katsuaki,Huh, Seok-Hwan 대한용접접합학회 2011 대한용접·접합학회지 Vol.29 No.5
Ag metallic particles from nano-scale to submicron-scale are combined with organic solvent to provide fine circuits and interconnection. Ink-jet printing with Ag nano particle inks demonstrated the potentials of the new printed electronics technology. The bonding at the interface between the Ag wiring layer and the various substrates is very important. In this study, the details of interfaces in Ag wiring are investigated primarily by microstructure observation. By adjusting the materials and sintering conditions, nicely formed interfaces between Ag wiring and Cu, Au or organic substrates are achieved. In contrast, transmission electron microscope (TEM) image clearly shows interface debonding between Ag wiring and Sn substrate. Sn oxides are formed on the surface of the Sn plating. The formation of these is a root cause of the interface debonding.
김근수,Kim, Keun-Soo 한국마이크로전자및패키징학회 2012 마이크로전자 및 패키징학회지 Vol.19 No.4
Sn whiskers are a serious cause of failure in electronic devices as they create short circuits. Sn whisker growth and mitigation have been investigated by many Japanese consortia including JEITA and JAXA. This paper gives an overview about recent researches of JEITA and JAXA.
김근수,Kim, Geun-Su 한국도서관협회 1970 圖協月報 Vol.11 No.11
이 해제 목록은 제16회 독서주간을 기념하기 위하여 9월 24일부터 30일까지 서울특별시립 종로 도서관에서 본 협회가 개회한 ‘제1회 한국잡지전시회’에서 출품 전시되었던 잡지를 해제한 것으로 해방이후부터 1960년까지 우리나라에서 간행된 것 중 김근수 선생이 소장하고 있는 것만을 실었음을 밝혀둔다.