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정세민 東亞大學校 大學院 1999 大學院論文集 Vol.24 No.-
It is known to us that photo-conductors reveal shot-noise in their operation and this kind of noise can be sucssesfully remove with the lock in amplifier(LIA) Because of the ability of the noise rejection in various circumstanes, the use of the LIA is more frequent than ever, Hence, we need to be farmiliar with the divice and operate skillfuly. For this purpose, author introduces a simple experiment using LIA, i.e. well known Photoelectric Effects. From the experimental result, it can be shown that the maximum energy of emitted photoelectrons is lying from 0.2eV to 0.3eV and the average energy is given by 0.43eV from the curve fitting. The maximum energy can be reasonably accepted from comparision with known data. Also from the fitting, it is found that the energy distribution would rather be a poissonian than maxwellian.
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丁世敏 東亞大學校 大學院 1987 大學院論文集 Vol.12 No.-
An externally heated copper vapor laser system is a useful device for parametric studies of laser output since the discharge parameter can be controlled without interruption of the tube system. The operation temperature of the copper vapor laser is higher than 1000℃, thus the choice of the heating element is very limited. So, we adopt an hybrid type heating system, in which the kanthal A-1 is selected for an auxiliary heating-element. In this esperiment, the measured laser output power is 0.8W, the optimum temperature is 150 0℃, the optimum discharging rate is 5㎑
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정세민,남정우,박종천,윤상문,김성용,조용진 조선대학교 공학기술연구원 2018 공학기술논문지 Vol.11 No.1
In this study, the dynamic behaviors of a two-dimensional section of a floating body in waves are predicted using a modified particle-based method with a turbulence model. To predict the motion of a floating body, the free roll decay problem is simulated using the passively moving-solid model and the results are validated by comparing with the experiments. For the motion analysis on a floating body in waves, several types of cargo condition assumed to be partially-filled with solid and liquid cargos, such as water and oil, are simulated both with and without damage. As a result, the case loaded with liquid cargo showed more stable motion compared to the case with solid cargo. In addition, in the case with oil are damaged, the oil leak from the damaged part as well as the appearance of the leaked oil spilling towards inland sea are confirmed with a time lapse.
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정세민,최유신,임동건,박영,송준태,이준식,Jung, S.M.,Choi, Y.S.,Lim, D.G.,Park, Y.,Song, J.T.,Yi, J. 한국결정성장학회 1998 한국결정성장학회지 Vol.8 No.4
본 논문은 PZT 박막의 기억소자 응용을 위한 Pt 그리고 RuO2 박막을 조사하였다. 초고주파 마그네트론 스퍼터링 방법을 이용하여 하부전극을 성장하였으며, 조사된 실험변수는 기판온도, 가스 부분압, RF 전력 그리고 후열처리 등이다. 기판온도는 Pt, $RuO_2$박막의 결정구조 뿐만 아니라 표면구조 및 비저항 성분에 크게 영향을 주었다. Pt 박막의 XRD 분석으로 기판온도가 상온에서 $200^{\circ}C$까지는 (111) 그리고 (200) 면이 혼재하는 결과를 보였으나 $300^{\circ}C$에서는 (111) 면으로 우선 방위 성장 특성을 보였다. XRD와 AFM 해석으로부터 Pt 박막 성장시 기판온도 $300^{\circ}C$, RF 전력 80W가 추천된다. 산소 분압비를 0~50%까지 가변하여 조사한 결과 산소가 5% 미만으로 공급되면 Ru 금속이 성장되고, 산소 분압비가 10 ~40%까지는 Ru와 $RuO_2$ 상이 공존하였으며 산소 분압비가 50%에서는 순수한 $RuO_2$상만이 검축되었다. 이 결과로부터 RuO2/Ru 이층 구조의 하부전극 형성이 산소 가스 부분압을 조절하여 한번의 공정으로 성장 가능하며, 이런 구조를 이용하면 금속의 낮은 비저항을 유지하면서도 PZT 박막의 산소 결핍에 의한 기억소자의 피로도 문제를 완화할 것으로 사료된다. 후 열처리 온도를 상온에서부터 $700^{\circ}C$까지 증가할 때 Pt와 $RuO_2$의 비저항 성분은 선형적 감소 추세를 보였다. 본 논문은 강유전체 기억소자 응용을 위한 최적화된 하부전극 제적조건을 제시한다. We have investigated Pt and $RuO_2$ as a bottom electrode for ferroelectric capacitor applications. The bottom electrodes were prepared by using an RF magnetron sputtering method. Some of the investigated parameters were a substrate temperature, gas flow rate, RF power for the film growth, and post annealing effect. The substrate temperature strongly influenced the surface morphology and resistivity of the bottom electrodes as well as the film crystallographic structure. XRD results on Pt films showed a mixed phase of (111) and (200) peak for the substrate temperature ranged from RT to $200^{\circ}C$, and a preferred (111) orientation for $300^{\circ}C$. From the XRD and AFM results, we recommend the substrate temperature of $300^{\circ}C$ and RF power 80W for the Pt bottom electrode growth. With the variation of an oxygen partial pressure from 0 to 50%, we learned that only Ru metal was grown with 0~5% of $O_2$ gas, mixed phase of Ru and $RuO_2$ for $O_ 2$ partial pressure between 10~40%, and a pure $RuO_2$ phase with $O_2$ partial pressure of 50%. This result indicates that a double layer of $RuO_2/Ru$ can be grown in a process with the modulation of gas flow rate. Double layer structure is expected to reduce the fatigue problem while keeping a low electrical resistivity. As post anneal temperature was increased from RT to $700^{\circ}C$, the resistivity of Pt and $RuO_2$ was decreased linearly. This paper presents the optimized process conditions of the bottom electrodes for memory device applications.
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탐라해상풍력발전단지가 제주 전력계통에 기여한 경제성 및 환경성 평가에 관한 연구
정세민,오웅진,이연찬,임진택,이기백,최재석 대한전기학회 2020 전기학회논문지 Vol.69 No.7
This paper proposes an evaluation methodology of the economics and environmental contribution of Tamla offshore wind farm which is owned by KOEN(Korea South-East Power Co, Ltd.). The probabilistic simulation system called “PRAWIN,” which has already been developed by this research team, is used in this study. An alternative new methodology in order to evaluate contribution of WTGs(Wind Turbine Generators) in view point of probabilistic production cost (economics) and CO2 emissions (environment) is developed in this paper. Furthermore, the wind speed contribution functions in view point of probabilistic production cost (economics) and CO2 emissions (environment) are newly formulated and proposed in this paper. The proposed contribution functions describe variation coefficients (sensitivities) of the economics (probabilistic production cost) and environment (CO2 emissions) according to changing wind speed of a wind farm. Using the new contribution functions proposed in this paper, Jeju power system sized model case study including Tamla offshore wind farm is demonstrated. The total production cost, average production cost unit and CO2 emissions of Tamla offshore wind farm are simulated and assessed in the case study. Using the proposed contribution functions, also, the contributions of wind speed of Tamla offshore wind farm in view point of economics (probabilistic production cost) and environment (CO2 emissions) are evaluated in this case study. Finally, It is demonstrated that probabilistic production energies, production costs and CO2 emissions of individual power generator are obtained in the case study
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정세민,정광천,최유신,김도영,김철수,이준신 성균관대학교 1997 학술회의지원논문목록집 Vol.1997 No.-
ZnO shows the properties of wide conductivity variation, high optical transmittance, and excellent piezoelectricity. Using these properties of ZnO, the material applications were extended to sensors, SAW filters, solar cells, and display devices. This paper investigated transmittance influenceing factors for thin film. ZnO grown by RF magnetron sputtering. The growth rate and structural investifation were carried out in conjuction with optical transmittance characteristics of thin film ZnO. THe glass substrate temperature of 175°C exhibited a preferrential crystallization along (002)orientation. Transmittance of ZnO film deposited at the substrate temperature of 175°C showed higher than 92%. An active sputter gas was investigated with a variation of O₂partial pressure from 0 to 100% in an Ar atmosphere. ZnO film grown in 100% Ar gas shws that a reduced transmittance of 82% at the short wavelengths and decreased resistivity value. As the partial pressure of O₂gas increased the optical transmittance was increased above 90% at the short wavelengths, however, resistivity was drastically increased to higher than 10⁴Ω-cm.
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