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전기화학증착에 의한 이트리아 안정화 지르코니아 박막의 제조
정지원,박동원,전치훈,최병진,김대룡 한국세라믹학회 1994 한국세라믹학회지 Vol.31 No.5
The yttria stabilized zirconia(YSZ) thin films for solid oxide fuel cell (SOFC) were fabricated by an electrochemical vapor deposition(EVD) technique using YCl3+ZrCl4+H2O gas system. The YSZ films were deposited under reduced pressure at the temperature of 1000~120$0^{\circ}C$ on the porous alumina substrates. The deposition rate, chemical composition and growth morphology were investigated by SEM, XRD, EDS. The growth rates of the films obeyed a parabolic rate law, representing that the growing process is controlled by an electrochemical transport through the YSZ film. The Y2O3 content of the films was about 10 mol%, equal to the composition of metal chloride reactant gases, approximately. The YSZ films were highly dense, the growing features showed columnar structure and surface morphologies were changed with the EVD conditions.
정지원 한국민중신학회 2019 Madang: Journal of Contextual Theology Vol.0 No.32
Inquiries are begun with very simple opinions. Does God exist as a gender-masculine? Was the Bible written only by men? In this sense, we can argue that God has the quality mother and all of the Bible was not written by men. Of course, this argument might not be 100% fact, but be probable. Or it seems a logical leap. Although there is such an objection, it could be shown that there is a new perspective that quits interpreting the Bible in only the way of men’s view. Silvia Schroer may indicate how a certain animal and its body part influenced the Israelite concept of God in the Old Testament. Using the archaeological findings, she analyzes that the vulture “nsr” ( (רשנ) is symbolized as a goddess and hides behind the deity in ancient Israel and the Old Testament. Nevertheless, almost every bible text translates the word “nsr” ( רשנ ) not as a ‘vulture’ but as an ‘eagle’, a typical male image of God. With regard to this situation, it can be in doubt that the authors have manipulated statements of women in Scripture. In order to expose the discrimination and manipulation, the memetic theory by René Girard is of use. The study is about looking for traces of the goddess in ancient iconographies of the Near East and Egypt, and if and how this imagery reflects or penetrates Israel’s mind. The Bible uses the phenomenon of the animal as a divine symbol. These facts show that the religious symbolism of Asia Minor and Egypt has been added unnoticed to the God-experience of Israel.
Analysis of Korean and Foreign Special Effects Make-up in Representative Films by Period
정지원,김은실 한국패션비즈니스학회 2018 패션 비즈니스 Vol.22 No.3
The purpose of this study is to gather basic data in the special effects make-up field and to provide a source of inspiration for creative make-up design by examining how special effects make-up is developed according to representative films. Two approaches are used in this study: a literature review and an empirical case analysis. In Korea, color TV was introduced in the 1980s, with the demand for a realistic image. Since the 2000s, 3D printing technology has been introduced to special effects make-up. Special effects make-up was first introduced in Hollywood films in the 1890s, and by the 1900s, artificial teeth and eyebrows were added and presented using general make-up techniques. Since then, 3D and 4D technologies and animation performance capture methods have been introduced and distributed due to the rapid development of computer technology.
정지원,김동현,장재호,이정택,유경현,윤석영 한국결정성장학회 2019 韓國結晶成長學會誌 Vol.29 No.1
The PMMA (polymethyl methacrylate)/clay nanocomposites were synthesized by in situ radical polymerizations with different clay contents (3 and 7 wt%) using microwave heating. The nanostructure, optical, and thermal properties of the synthesized PMMA/clay nanocomposites were measured by XRD, TEM, AFM, UV-vis, and TGA. It was found that the intercalated- or exfoliated structure of PMMA/clay nanocomposites was strongly dependent on the content of clay. Thus, the imposition of microwave-assisted polymerization facilitated a delamination process of layered silicates to achieve exfoliation state of interlayer distance. The PMMA/3 wt% C10A nanocomposite with well-dispersed and exfoliated clay nano-layers showed the good optical transparency similar to pure PMMA in this study. The thermal decomposition rates of the PMMA/clay nanocomposites become to be lower compared to that of the pure PMMA, indicating the intercalated- or exfoliated inorganic silicate has high thermal stability. A possible reason is that the thermally segmental motion of PMMA polymer into inorganic silicate interlayer spacing has increased the thermal stability of the PMMA/clay nanocomposites.
L₁ 적응 제어를 이용한 스텔스 형상의 무인전투기 제어
정지원,심현철 한국항공우주학회 2013 한국항공우주학회 학술발표회 논문집 Vol.2013 No.11
큰 뒤 젖힘각을 갖는 Blended Wing Body 형태의 UCAV1303 의 기본 공력 특성을 파악하기 위해 풍동실험 및 전산수치해석을 수행하였다. 기존에 알려진 바와 같이 UCAV1303 은 큰 뒤 젖힘각으로 인해 앞전 와류가 발생하고 이로 인해 특정 받음각 이상에서 Pitch break 현상이 발생한다. Pitch Break 를 극복하고 안정성을 증대시키기 위하여 L1 적응 제어 법칙을 이용하여 제어기를 설계하였다. UCAV1303 기체의 동역학을 모델링하고 풍동 실험 및 전산 수치 해석 결과를 DB 화 하여 Matlab/Simulink 환경을 구성하고 제어기의 성능을 검증하였다. 앞전 와류의 Spanwise 흐름을 막아주어 Pitch Break 를 제어하기 위해 Wing Fence 를 구동가능 하도록 제작 하여 비행실험을 수행하였다. A BWB aircraft with large sweepback angle has high level of nonlinear longitudinal aerodynamic characteristics, vortex lift and pitch break phenomenon. To suppress the pitch break phenomenon with augmented stability even at high AoA region, L1 adaptive control was implemented with baseline Proportional-Integral (PD) control. The L1 adaptive control law that can compensate both matched and unmatched uncertainties and can adapt to the un-modeled dynamics was used to design the pitch angle controller. For discrete time domain, Processor-in-the-Loop Simulation(PILS)s was performed in Matlab/simulink. And Flight Test were conducted. The longitudinal high-alpha level flight simulation verified the good performance for stability augmentation with the designed controller. The better sufficient stability and performance of the designed controller with fast adaptation and consistent transient performance was verified compared with PD controller.
L₁ 적응 제어를 이용한 UCAV 1303의 피치 브레이크 제어
정지원,이상협,심현철 한국항공우주학회 2013 한국항공우주학회 학술발표회 논문집 Vol.2013 No.4
큰 뒤 젖힘각을 갖는 Blended Wing Body 형태의 UCAV1303 의 Pitch break 현상을 극복하고 안정성을 증대시키기 위하여 L1 적응 제어 법칙을 이용하여 제어기를 설계하였다. UCAV1303 기체의 동역학을 모델링하고 제어기 설계 단계에서 알고 있다고 가정된 선형 모델을 이용하여 제어기를 설계하였다. Matched/unmatched 불확정성 모두를 보상 가능하며 모델링이 되지 않은 동역학에도 적응할 수 있는 L1 적응 제어 법칙을 이용하여 피치각 제어를 위한 제어기를 설계하였다. 시뮬레이션을 통해 종방향이 불안정한 고받음각 영역에서의 안정성이 증대됨을 확인하였고 X-Plane 을이용해 Pitch Break 상황을 모사하고 PILS 테스트를 통해 고 받음각 영역에서의 등속 수평비행 시뮬레이션을 수행하여 설계된 제어기의 성능을 검증하였다. A BWB aircraft with large sweepback angle has high level of nonlinear longitudinal aerodynamic characteristics, vortex lift and pitch break phenomenon. To suppress the pitch break phenomenon with augmented stability even at high AoA region, l adaptive control was implement with baseline Proportional-Integral (PD) control. The L1adaptive control law that can compensate both matched and unmatched uncertainties and can adapt to the un-modeled dynamics was used to design the pitch angle controller. For discrete time domain, Processor-in-the-Loop Simulation(PILS)s was performed in XPLANE. The longitudinal high-alpha level flight simulation verified the good performance for stability augmentation with the designed controller. The better sufficient stability and performance of the designed controller with fast adaptation and consistent transient performance was verified compared with PD controller.