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사물인터넷 시대의 생체인식 스마트 센서 기술과 연구 동향
김광석,김대업,Kim, Kwang-Seok,Kim, Dae Up 한국마이크로전자및패키징학회 2016 마이크로전자 및 패키징학회지 Vol.23 No.2
With the pace of rapid innovation in technology of IoT (Internet of Things) and smart devices, biometric technology becomes one of the most progressive industries. Recent trends in biometrics show most are focused on embedding biometric sensors in mobile devices for user authentication. Multifactor biometrics such as fingerprint, retina, voice, etc. are considering as identification system to provide users with services more secured and convenient. Here we, therefore, demonstrate some major technologies and market trends of mobile biometric technology with its concerns and issues.
김광석,Hye-Min Lee,Ju-Hwan Kim,Injun Jung,나원진,이병선,Byung-Joo Kim,김정필 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.112 No.-
Despite active research on supercapacitors to address the demand for high-power backup power systems,the energy storage performance of supercapacitors at high current densities has scope for improvementowing to the poor kinetics of active materials. In this study, multiscale porous carbon-based active materialswere designed to improve the kinetics and power density of supercapacitors. These materials werefabricated by spinodal decomposition of a mixture comprising an epoxy resin, a curing agent, and a porogen,to which graphene was added to optimize the carbonaceous microstructure. The resultant materialexhibited a wider pore-size distribution and considerably improved microstructure than commercialactivated carbon (YP-50F). The charge-transfer resistance of the sample containing 3 wt.% graphene(A-EM3) was considerably lower than that of YP-50F owing to the microstructural improvement. Furthermore, the effective ionic conductivity of A-EM3 was approximately three times higher than thatof YP-50F owing to enhanced mass transfer. A-EM3 exhibited a high specific capacitance (81.0 F g1) atthe highest current density (10.0 A g1). Thus, spinodal decomposition and graphene addition are effectivemeans to fabricate high-power-density supercapacitors.
잉크젯 프린팅 방식으로 형성된 구리 배선의 전기적 특성 평가
김광석,구자명,정재우,김병성,정승부,Kim, Kwang-Seok,Koo, Ja-Myeong,Joung, Jae-Woo,Kim, Byung-Sung,Jung, Seung-Boo 한국마이크로전자및패키징학회 2010 마이크로전자 및 패키징학회지 Vol.17 No.3
직접인쇄기술 방식은 기존의 포토리소그래피 방법을 이용한 패터닝 기술에 비해 저비용, 간단한 공정 과정, 친환경성 등 여러 장점들로 인해 미세 회로 형성 분야의 그린 테크놀로지로 최근 각광받고 있다. 이러한 프린팅 기반의 전자기술을 상용화하기 위해서는 프린팅 방식으로 형성된 회로의 전기적 특성 평가가 필수적인데, 이에 본 연구에서는 구리 잉크를 이용하여 잉크젯 프린팅 방식으로 2 가지 타입, parallel transmission line(PTL)과 coplanar waveguide(CPW) 구조의 회로를 형성하고 $250^{\circ}C$에서 30분 동안 소결하여 완성하였다. 전류-전압 그래프로 직류 저항을 측정하여 벌크 구리의 비저항 값의 약 3.3배되는 평균 0.558 ${\mu}{\Omega}{\cdot}cm$의 비저항 값을 도출하였고 회로의 고주파 특성 평가를 위해 주파수 범위 0~30 GHz에서 probe station chuck과 샘플 간의 갭 유무에 따른 scattering parameter를 측정하였다. 모든 시편에서 5 dB 이하의 반사 특성을 보였으며, PTL 회로가 CPW 구조보다 전반적으로 더 좋은 통과 특성을 나타내었다. Direct printing technology is an attractive metallization method, which has become immerging as "Green technology" to the conventional photolithography, on account of low cost, simple process and environment-friendliness. In order to commercialize the printed electronics in industry, it is essential to evaluate the electrical properties of conductive circuits using direct printing technology. In this contribution, we focused on the electrical characteristics of inkjet-printed circuits. A Cu nanoink was inkjet-printed onto a Bisaleimide triazine(BT) substrate with parallel transmission line(PTL) and coplanar waveguide(CPW) type, then was sintered at $250^{\circ}C$ for 30 min. We calculated the resistivity of printed circuits through direct current resistance by the measurement of I-V curve: the resistivity was approximately 0.558 ${\mu}{\Omega}{\cdot}cm$ which is about 3.3 times that of bulk Cu. Cascade's probe system in the frequency range from 0 to 30 GHz were employed to measure the Scattering parameter(S-parameter) with or without a gap between the substrate and the probe station chuck. The result of measured S-parameter showed that all printed circuits had over 5 dB of return loss in the entire frequency range. In the curve of insertion loss, $S_{21}$, showed that the PTL type circuits had better transmission of radio frequency (RF) than CPW type.
김광석,박원준,Kim, Gwang-Suk,Park, Won-Jun 한국전자통신학회 2012 한국전자통신학회 논문지 Vol.7 No.3
최근 국내 지상파 디지털 전환정책은 순조롭게 이루어지는 듯하다. 하지만 많은 사람들은 디지털 전환 정책에 대해서 많은 우려를 나타내고 있다. 이에 본 연구는 국내 지상파 방송 디지털 전환에 따라 시청자들이 디지털 서비스를 받아들이는데 영향을 미치는 요인에 대해서 알아보았다. 이를 위해서 기술수용모형에서 주로 언급하는 인지된 유용성, 인지된 용이성, 사회적 영향 등에 대한 평가를 통해서 디지털 전환 서비스의 이용의도를 분석하였다. 분석 결과 사회적 영향, 개인의 성향, 디지털 전환에 대한 인지가 이용의도에 유의미한 영향을 미치는 것으로 나타났다. This Paper focused on use intention at affect variable of broadcasting digital switchover. The author assumed that the perceived usability and perceived availability, social influence of technology acceptance model(TAM) are likely to affect the technological acceptance of broadcasting digital switchover. The results of this paper significant affect on the use intention of Social Influence, Personal Characteristics, Digital switchover perceive.
김광석,최돈현,정승부,Kim, Kwang-Seok,Choi, Don-Hyun,Jung, Seung-Boo 한국마이크로전자및패키징학회 2014 마이크로전자 및 패키징학회지 Vol.21 No.2
Technology for high power devices has made impressive progress in increasing the current density of power semiconductor, system module, and design optimization, which realize high power systems with heterogeneous functional integration. Depending on the performance development of high power semiconductor, packaging technology of high power device is urgently required for efficiency improvement of the device. Power device packaging must provide superior thermal management due to high operating temperature of power modules. Here we, therefore, review critical challenges of typical power electronics packaging today including core assembly processes, component materials, and reliability evaluation regulations.