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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.
장기적(長期的) 산업성장(産業成長) 및 구조변화요인(構造變化要因)의 분석(分析) (1955~85)
김광석,홍성덕,Kim, Kwang-suk,Hong, Sung-duk 한국개발연구원 1990 韓國 開發 硏究 Vol.12 No.1
60년대 전반 이후의 수출주도형(輸出主導型) 공업화(工業化)을 통한 고도성장(高度成長)은 국내산업(國內産業) 또는 업종간(業種間) 성장율(成長率)의 차이로 인해서 상당한 산업구조변화(産業構造變化)를 수반했다. 따라서 본 논문에서는 산업연관표체계(産業聯關表體系)를 사용하여 우리나라의 장기적(長期的)인 산업성장(産業成長) 및 구조변화(構造變化)의 요인(要因)을 분석해 보고자 한다. 즉 과거(過去)의 장기적(長期的)인 성장과정(成長過程)에서 국내수요(國內需要), 수출(輸出), 수입대체(輸入代替)와 기술변화(技術變化)는 산업별 생산성장(生産成長)에 각각 얼마만큼 기여(寄與)했나 하는 것을 측정해 보고자 한다. 이러한 측정은 총량적(總量的) 경제수준(經濟水準)뿐만 아니라 세부산업별(細部産業別)로도 이루어질 수 있기 때문에 한국경제(韓國經濟) 전반(全般) 및 공업부문(工業部門)의 세부적(細部的) 변화과정(變化過程)에 관한 풍부한 분석자료(分析資料)를 제공할 것으로 기대한다. Korean input-output tables for 1975 and 1985 are first deflated into 1975 constant domestic prices(hypothetical terms), and the constant price I-O data are used to decompose the sources of industrial growth and structural change during the 1975-85 period. Using the same methodology, our results for the 1975-85 period are then linked to the results for the earlier period(1955-75) in order to analyze and evaluate the "demand-side" sources of industrialization over the past three decades. The results from the decomposition of the whole economy indicate that over three decades(1955-85) the relative contribution of domestic demand expansion (DDE) to growth and structural change has continuously declined while the contribution of export expansion(EE) has generally continued to rise. The contribution of import-substitution(IS) which had been significantly higher than that of EE during 1955-63 declined substantially, remaining at an insignificantly low level during the period following 1963. Although it is well known that the government's industrial policy in the 1970s emphasized import-substitution in heavy and chemical industries, no significant changes in the export-oriented growth pattern could be observed even for that period, except for a minor decline in the relative contribution of EE. This may be attributed to the substantially larger, backward-linkage effects of EE than that of IS. The sources-of-growth decompositions for major branches of the manufacturing sector generally support the major conclusions derived from the decomposition for the whole economy. The IS contribution which had been significantly high in almost all manufacturing branches during the 1955-63 period declined to low levels in all but two branches, heavy industry and machinery, during the following period. On the other hand, the relative contribution of EE showed a continuous rise in almost all manufacturing branches(except food processing). Finally, the sources of growth for 1975-85 which were decomposed by detailed sub branches, are analyzed by correlating them with changes in relative prices and industrial protection rates by sub-branches for the same period. A major result is that contrary to general expectations, the EE contributions by sub-branch are not negatively correlated with the nominal rates of protection and/or the effective rates of protection for the same sub-branches. It is also found that no statistically significant, positive correlation exists between IS contributions and nominal protection rates or effective protection rates. These unexpected results may be explained by the peculiar nature of the Korean system of industrial incentives for the past period.
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.