• 마이크로전자및패키징학회지
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• 제12권4호통권37호
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• pp.359-363
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• 2005

유기 박막트랜지스터 (OTFT)를 제작하기 위하여 게이트 절연막으로서 PVP 계통의 유기막을 갖는 MIM(metal-insulator-metal)구조의 유기 절연층 소자를 제작하였다. 유기 절연층의 형은 ITO/Glass 기판위에 polyvinyl 계열의 PVP(poly-4-vinylphenol)를 용질로, PGMEA (propylene glycol monomethyl ether acetate)를 용매로 사용하여 co-polymer PVP를 제조하였다. 또한 열경화성 수지인 poly(melamine-co-formaldehyde)를 경화제로 사용하여 cross-linked PVP 절연막을 합성하였다. 유기 절연층의 전기적 특성은 co-polymer PVP 소자에 비해 cross-link 방식으로 제조된 소자에서 약 300 pA의 낮은 누설전류와 상대적으로 낮은 잡음전류의 특성을 나타내었다. 또한 cross-linked PVP 절연막에서 보다 양호한 표면형상 (거칠기)이 관찰되었으며 정전용량 값은 약 0.11${\~}$0.18 nF의 값을 나타내었다.

• Journal of Korea Trade
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• 제23권7호
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• pp.34-44
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• 2019

Purpose - The purpose of this study is to present what the port of Pyeongtaek, the hub of Korean trade with China, should improve in the current situation, wherein the e-commerce trade volume between Korea and China is increasing due to the development of online technology. Design/methodology - In this study, through prior research and expert interviews on e-commerce and port activation between borders, we derived the main improvement factors for 1) Administration and Systems, 2) Facilities, 3) Transport, and 4) Manpower, and selected 12 detailed variables for the major improvement factors. To identify the relative importance of the major improvement factors, the Analytic Hierarchy Process (AHP) method was applied, and a survey was conducted among 15 related experts. Findings - As a result, among the 12 detailed variables, Composition of Association (0.267) was the first factor to be improved, followed by Incentive Support (0.143) and E-Commerce Cluster (0.131). Based on these analyses, the main implications of this study are, first, in the current situation where the cross-border e-commerce market is growing, Pyeongtaek Port needs to form a consultative body among the government, local governments, and related businesses in connection with cross-border e-commerce and develop various support policies for the e-commerce market. Second, it will have to be able to provide differentiated services from competing ports by establishing e-commerce market-oriented clusters. Originality/value - In existing related studies, various improvements were presented to revitalize trade in line with the growth of the cross-border e-commerce market. However, with regard to most cross-border e-commerce businesses, one-dimensional improvement measures, such as improvement of payment systems, improvement of customs clearance services, and promotion of human resources, are presented in a piecemeal manner. In other words, none of the studies have proposed the importance and priority of each measure in terms of both the forward-looking and efficient allocation of resources, which is the purpose of this study. Therefore, this study contributed politically, practically, and academically by presenting countermeasures for ports to revitalize cross-border e-commerce and presenting strategic priorities using quantitative analysis methods.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 B
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• pp.388-391
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• 2003

Disturbance observer(DOB) is effective to enhance the performance of system in the presence of disturbances. Various types of disturbance observer have been proposed to improve sensitivity function of system. However, it has been observed that current DOBs tend to bring poor transient response due to cross-couplings. This paper proposes a new type of disturbance observer to reduce effect of cross-couplings and provide simpler structure than Dual DOB. Finally, we verify the performance of the proposed DOB through numerical simulations.

• 비교문화연구
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• 제28권
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• pp.141-161
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• 2012

Abusive language used by college students reflects current social attitudes and values. Adopting a comparative and cross-cultural perspective, this study examines the frequency and perceived severity of abusive language in English and Mandarin Chinese. Because abusive language often includes sexual connotations, this paper employs a particular concentration on sexism. Gender differences in the use of abusive language illustrate a male bias across cultures.

• Ocean Systems Engineering
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• 제11권1호
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• pp.43-58
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• 2021

In the present work, a 3D numerical model is proposed to study local scouring around single vertical piers with different cross-section shapes under steady-current flow. The model solves the flow field and sediment transport processes using a coupled approach. The flow field is obtained by solving the Unsteady Reynolds Averaged Navier-Stokes (URANS) equations in combination with the k-ω SST turbulence closure model and the sediment transport is considered using both bedload and suspended load models. The proposed model is validated against the empirical measurements of local scour around single vertical piers with circular, square, and diamond cross-section shapes obtained from the literature. The measurement of scour depth in equilibrium condition for the simulations reveal the differences of 4.6%, 6.7% and 13.1% from the experimental measurements for the circular, square, and diamond pier cases, respectively. The model displayed a remarkable performance in the prediction of scour around circular and square piers where horseshoe vortices (HSVs) have a leading impact on scour progression. On the other hand, the maximum deviation was found in the case of the diamond pier where HSVs are weak and have minimum impact on the formation of local scour. Overall, the results confirm that the prediction capability of the present model is almost independent of the strength of the formed HSVs and pier cross-section shapes.

• Journal of international Conference on Electrical Machines and Systems
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• 제3권4호
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• pp.451-457
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• 2014

Parallel operation systems have an advantage in that they can be constructed quickly and inexpensively by combining existing electric power converters. However, in this case, there is a peculiar problem in that a cross current flows between the electric power converters. To design a control system more simply and commonalize the core of combination reactors, we reviewed a system construction method for parallel operation systems constructed with three electric power converters.

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2009년도 한국우주과학회보 제18권2호
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• pp.44.1-44.1
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• 2009

Identification of wave characteristics during current disruption events in the near-Earth geomagnetic tail region (~ 10 RE) is important to understand the substorm onset mechanism. In this paper, linear stability analysis in the ion-cyclotron grequency range, considering temperature anisotropy and cross-field flow is presented. It is found that the ion-cyclotron drift waves propagating in a quasi-perpendicular direction with respect to the ambient magnetic field are characterized by low frequencies ($\omega$ < $0.5{\Omega}ci$), while quasi-parallel waves have frequencies close to the ion-cyclotron frequency ($\omega{\sim}{\Omega}ci$). This finding is consistent with the observation by THEMIS spacecraft of a current disruption event in which a similar high- and low-frequency band structure is also present [A. T. Y. Lui, et al., J. Geophys. Res. 113, A00C06 (2008)]. It is also found that the quasi-perpendicular mode is excited by the ion cross-field flow.

• 한국자기학회지
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• 제5권5호
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• pp.372-375
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• 1995

The magnetization pattern of the central cross section deduced from the ac susceptibility measurement is described with an analytical function. The function is based on a charge-free configuration. The thickness of the $^{\circ}$ wall lying in a (100) plane and the wall energy are calculated analytically. Total energy of the domain structure has been minimized with Ritz's method. As the result of the minimization, the energy density of the $^{\circ}$ wall lying in a (100) plane is $0.58\;erg/cm^{2}$ and the one for a (110) plane is $1.18\;erg/cm^{2}$. Thicknesses of these walls are calculated numerically. Also, the calculation indicates there is a small central domain at the cross section without applied current. With the ac susceptibility measurement the existence of the domain without current can be identified.

• 비교문화연구
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• 제21권
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• pp.87-111
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• 2010

This research examines the concept of 'homo sovieticus' by reviewing the sociological essay novel homo sovieticus written by Zinoviev who was one of the well-known dissident in Soviet Union period, and attempts to have critical understanding of the concept. It is an interesting research topic that current Russia and Russians who get through the historical layers from Soviet to post-Soviet regime at the time current trend that allows to have various academic discussions of post-Soviet. It is required to examine the past of Russia and Russian to make precise estimation of their current and future. Therefore, it is necessary to re-examine the term of 'homo sovieticus' which is conventionally accepted. This research aims at broad comprehension of homo-sovieticus by focusing on the Zinoviev's own understanding instead of the habitual use of the term which only contains ideological and political intention.

• 대한전자공학회논문지SD
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• 제45권6호
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• pp.10-15
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• 2008

본 논문에서는 UHF RFID 응용을 위한 새로운 NMOS 게이트 교차연결 전류미러형 브리지 정류기를 제시하였다. 제시된 정류기의 직류 변환 특성은 고주파 등가회로를 이용하여 해석하였으며, 주파수 증가에 따른 게이트 누설전류를 회로적인 방법으로 줄일 수 있는 게이트 커패시턴스 감소 기법을 이론적으로 제시하였다. 구해진 결과, 제안한 정류기는 기존의 게이트 교차 연결형 정류기와 거의 같은 직류 출력전압 특성을 보이면서도, 게이트 누설전류가 1/4 이하로 감소하고, 부하저항에서의 소비전력도 30% 이상 감소하며, 부하저항의 변화에 대해 보다 안정적인 직류전압을 공급함을 알 수 있었다. 또한 제안한 정류기는 13.56MHz의 HF(for ISO 18000-3)부터 915MHz의 UHF(for ISO 18000-6) 및 2.45GHz의 마이크로파 대역 (for ISO 18000-4)까지의 전 주파수 범위에 대해 충분히 높고 잘 정류된 직류 변환 특성을 보여 특정 주파수 대역을 사용하는 다양한 RFID 시스템의 트랜스폰더 칩 구동을 위한 범용 정류기로 사용될 수 있다.