TiO_(2-X) 박막 습도센서의 제조 및 그 특성

이성필,윤여경 경남대학교 신소재연구소 1996 論文集 Vol.6 No.-

TiO_(2-x) 박막 습도센서를 R.F. 스퍼터링에 의해 제조하고, 스퍼터링 조건과 산소 함유량 그리고 열처리 조건에 따른 습도 감지 특성 및 동작 온도에 따른 특성 등을 조사하였으며, Auger 전자분광기와 전자현미경으로 그 원인을 규명하였다. TiO_(2-x) 박막 습도센서는 부 임피던스 습도특성을 보였으며 가장 높은 감도와 선형성을 보일 때의 산소조성비에 따른 기울기는 x=0.38인 소자가 약 -0.033이었고, 감도는 동작온도가 30℃일 때 74%이었다. 동작온도가 30℃일 때 응답 시간은 흡착시 약 2분, 탈착시에는 약 3분이었다. TiO_{2-x} thin film humidity sensors have been fabricated by sputtering method and their physical and hygroscopic characteristics have been investigated. The sputtering conditions, oxygen contents and sintering conditions affect the sensor's sensitivity toward humidity. AES and SEM micrographs were taken for the analysis of crystal structures. surface morphology caused by adsorbed water vapour. TiO_{2-x} humidity sensors showed negative impedance-humidity characteristics and the sensor which was x=0.38 showed higher sensitivity and linearity than others. Then the slope of the sensor was about -0.033 and the sensitivity was about 74% at the operating temperatute of 30 C. The response time of TiO_{2-x} humidity sensors was about 2 min. for adsorption, and about. 3 min. for desorption at the operating temperature of 30℃.

환경 모니터링용 다층구조 TiQ₂ 박막형 습도센서

이성필,윤여경 경남대학교 환경문제연구소 2000 환경연구 Vol.23 No.-

MIS Capacitor multi-layer humidity sensors that Ti0₂/Si0₂/Si₃N₄ and porous gold electrode are deposited onto the gate insulator layer have been fabricated and their characteristics have been investigated for environmental monitoring. The normalized capacitance increased from 0.49 to 0.57, as relative humidity increased from 30% to 90%. The sensor sensitivities at 60% RH and 90% RH were about 17.4% and 29.5%, respectively, and it showed a relatively high linearity. The response time of the fabricated sensor was about 15 sec. in adsorption process.

FET형 습도센서의 제조 및 그 특성

이성필,윤여경,김성진 慶南大學校 附設 工業技術硏究所 1998 硏究論文集 Vol.16 No.-

실리콘 마이크로 테크롤로지를 이용하여 MOSFET의 게이트 금속 전극사이에 감습물질인 TiO₂ 박막을 형성하여 MOSFET의 전계효과와 TiO₂박막의 습도감지 특성을 결합시킨 형태의 FET형 습도센서를 제조하고, 습도변화에 따른 감지 특성을 조사하였다. 제조된 HUSFET은 전형적인 enhancement 특성이 나타났으며, 문턱전압은 상대습도 60%에서 약 2.7 V였다. 상대습도가 30%에서 90%로 증가함에 따라 HUSFET의 문턱 전압은 3.0 V에서 2.4 V로 감소하였으며, 드레인 전류는 335μA에서 405μA로 증가하였다. 드레인과 게이트 전압을 고정하였을 때 HUSFET의 감도는 3.2gμA/RH로 나타났다. A new device, named humidity sensitive field effect transistor(HUSFET), for an integrated humidity sensors has been fabricated using conventional silicon micro-technology. The gate structure of the HUSFETs is TiO₂/Si₃N₄/SiO₂and water molecular permeable electrode is formed by thin porous gold. The fabricated devices showed typical enhancement mode characteristics and threshold voltage was about 2.7 V in 60 %RH. It can be seen that the threshold voltages of HUSFET decreased from 3.0 V to 2.4 V and the drain current increased from 335μA to 405 gμA according to increasing the relative humidities from 30% to 90%. The sensitivity of HUSFET was 3.2μA/RH when the drain and gate voltage are constant.

TiO₂_(x) Thin Film Humidity Sensors by RF Magnetron Sputter

Yoon, Yeu Kyung,Rim, Jae Young,Lee, Sung Pil 경북대학교 센서기술연구소 1994 센서技術學術大會論文集 Vol.5 No.1

TiO_(2-x) thin film humidity sensors have been fabricated by sputtering method and their physical and hygroscopic characteristics have been investigated. The sputtering conditions, oxygen contents and sintering conditions affect the sensor's sensitivity towad humidity. AES and SEM micrographs were taken for the analysis of crystal structures, surface morphology caused by adsorbed water vapour. TiO_(2-x) humidity sensors showed negative impedance-humidity characteristics and the sensor that was x=0.38 showed higher sensitivity and linearity than others.

독일의 고용정책 비판과 대안

박경순(Park Kyung-Soon),윤여덕(Yoon Yeu-Dug) 한국사회학회 2006 韓國社會學 Vol.40 No.2

독일의 고용정책은 사회협약에 기초한 노동시장 구조개혁정책으로 특징지을 수 있다. 여기서 관철되고 있는 정책개념은 공급지향정책이다. 이 정책은 독일의 실업을 구조적 실업으로 진단하고, 노동시장의 효율적 배분 메커니즘의 회복을 목적으로 하는 유연화 정책을 유일한 해법으로 제시한다. 이 정책이 겨냥하는 것은 물론 노동조합과 복지국가체계이다. 공급지향정책은 실업을 노동시장의 현상으로 설명하는 신고전주의 노동시장이론 및 뉴케인즈주의 NAIRU 개념을 이론적 준거로 삼고 있다. 그러나 이 노동시장중심적 시각의 ‘지적 오류’는 실질임금을 실업의 원인으로 파악하고 있다는 것이다. 공급지향정책의 유연화전략의 결과 비정규직의 확대, 임금근로자의 소득감소 및 소득불평등 등의 문제가 야기되고 있다. 노동시장중심적 사고에 대해 본 논문은 포스트케인즈주의에 의지하여 수요부족이 실업의 원인임을 주장하며, 정책대안으로 장기적 수요지향정책을 제안한다. 수요지향정책은 시장의 위계구조에서 출발, 자산시장을 분석의 중심에 두고 있다. 자산시장에서 결정된 (균형)이자율은 자본형성을 매개로 생산규모와 고용수준을 결정한다. 즉, 자본주의 화폐경제는 저고용의 균형이라는 특징을 갖는다. 이것이 함의하는 바는 실업은 노동시장과 무관하고, 본질적으로 수요현상이라는 것 그리고 실질임금은 경제과정의 결과이지 결코 실업의 원인이 아니라는 사실이다. 따라서 수요지향정책은 거시정책을 통한 수요증대를 실업해소의 출발점으로 삼는다. The German employment policy can be characterized by structural reform policy based on social pact. Its key concept is a supply-oriented policy. Diagnosing the German unemployment as structural one, it suggests flexibilization of the labor market as a unique solution to restore effective mechanisms of allocation on the labor market and to decrease unemployment. The target is, of course, trade union and the welfare state system. This policy is justified by the neoclassical labor market theory and the newkeynesian NAIRU concept, which identify unemployment as a labor market phenomenon. But a central ‘intellectual failure’ of this labor market-centered view lies in the explanation of real wage as a cause of unemployment. Flexibilization policy has induced expansion of irregular employment, decrease in employee’ income, and deterioration of income distribution. In contrast to it this paper argues that the german unemployment is rooted in demand deficiency, and proposes a long-run demand-oriented policy as a alternative. This demand-oriented policy assumes a hierarchy of markets and sets the analysis focus on the asset market. According to it, economic processes is steered by the asset market. That ist, an (equilibrium) interest rate formed in the asset market generates the amount of capital stock by which the level of production and employment are determined. In other words a capitalist monetary economy is characterized by a equilibrium with underemployment. This implies that unemployment does not relate to the labor market but is a demand phenomenon, and that real wage is not the cause of unemployment but a result of market processes. Therefore a demand-oriented policy takes increasing the demand level through macro-policy as a departure to solve the unemployment problem.

Identification of novel immunogenic proteins against <i>Streptococcus parauberis</i> in a zebrafish model by reverse vaccinology

Kim, Young Su,Yoon, Nam-kyung,Karisa, Nadia,Seo, Sin-hye,Lee, Jeong-soo,Yoo, Sung-sik,Yoon, In-joong,Kim, Yeu-chun,Lee, Hongweon,Ahn, Jungoh Academic Press 2019 Microbial pathogenesis Vol.127 No.-

<P><B>Abstract</B></P> <P> <I>Streptococcus parauberis</I> is the major infectious agent of streptococcosis in the olive flounder (<I>Paralichthys olivaceus</I>), causing serious economic damage. In this study, we identified potential vaccine candidates against <I>S. parauberis</I> by reverse vaccinology. In total, the 2 out of 21 proteins were identified as vaccine candidates from two available <I>S. parauberis</I> genomes. The membrane-anchored protein SEC10/PgrA and the metal ABC transporter substrate-binding lipoprotein mtsA were potent antigenic proteins based on western blotting with mouse-derived antiserum against whole bacteria of <I>S. parauberis</I> serotypes I and II. In particular, metal ABC transporter substrate-binding lipoprotein (<I>mtsA</I>) showed similar protective immunity to that of whole-cell bacterins against <I>S. parauberis</I> in a zebrafish model. These results suggest that mtsA may be considered as a novel candidate in the development of vaccines against <I>S. parauberis</I>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We identified 41 vaccine candidates against <I>Streptococcus parauberis.</I> </LI> <LI> SEC10/PgrA and mtsA were potent antigenic proteins. </LI> <LI> <I>mtsA</I> showed high protective immunity in a zebrafish model. </LI> </UL> </P>

고주파 마그네트론 스퍼터링에 의한 TiO2-x 박막 습도센서의 습도감지특성

이성필,윤여경 ( Sung Pil Lee,Yeu Kyung Yoon ) 한국센서학회 1998 센서학회지 Vol.7 No.2

TiO_(2-x) thin film humidity sensors have been fabricated by sputtering method and their physical and hygroscopic characteristics have been investigated. The sputtering conditions and sintering conditions affect the sensor`s sensitivity toward humidity. AES and SEM micrographs were taken for the analysis of crystal structures, surface morphology caused by adsorbed water vapour. TiO_(2-x) humidity sensors showed negative impedance-humidity characteristics and the sensor which was fabricated by experimental condition 2(rf power of 200W) showed higher sensitivity and linearity than others. Then the slope of the sensor was about 0.794 ㏀/%RH and the response time of TiO_(2-x) humidity sensors was about 2 min. for adsorption and about 3 min. for desorption at the operating temperature of 30℃.