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한선우,김현숙 한국심리유형학회 2022 심리유형과 인간발달 Vol.23 No.1
The purpose of this study is to synthesize research findings on public self-consciousness and the variables related to it. Fourty published articles and masters theses from 2002 tod 2020 were selected. A total of 115 effect size values extracted from these papers were analyzed using CMA (Comprehensive Meta-Analysis Version 2.0), a meta-analysis program. The main results are as follows. First, in terms of the characteristics of the study to be analyzed, most of the studies were conducted on college students, and it was confirmed that the public self-consciousness related studies were gradually increasing overall. Second, the overall effect size of the positive factors of the public self-consciousness related variable group was small and insignificant. On the other hand, all of the negative factors of the public self-consciousness related variable group were significant with the median effect size. In detail, in the negative factors of each variable group related to public self-consciousness, self-evaluation and self-concept showed large effect sizes, followed by interpersonal relationships, emotions, and coping methods, followed by medium effect sizes. Finally, job-related showed a small effect size. Based on the results of this study, it helps to increase interest and understanding of public self-consciousness, which is a consistent and persistent characteristic of an individual, and provides implications in that it can be presented as useful and empirical basic data for counseling intervention.
가스터빈 연소기에서 스월 수와 연소실 길이에 따른 연소불안정 특성
한선우,안규복,이다인,황동현 한국연소학회 2023 한국연소학회지 Vol.28 No.1
Combustion instability characteristics were investigated through combustion tests using ethylene and air in a model gas turbine combustor. At various flow conditions, the swirl number and combustion chamber length were changed independently. Dynamic pressure transducer and photomultiplier tube with a bandpass filter were used to measure pressure oscillations and heat release fluctuations. Analysis of phase difference and flame structure showed that the unstable mode had resonant frequencies of the combustion chamber and the inlet mixing section. When the swirl number increased, it was confirmed that the instability mode corresponding to the resonance frequency of the inlet mixing section disappeared. In addition, resonance mode analysis was performed using the OSCILOS code and compared with the experimental results.
(La, Sr)MnO3 을 이용한 가변 방사율 소재에 관한 연구
한선우,최봉수,송태호,김성진,이봉재 대한기계학회 2013 大韓機械學會論文集B Vol.37 No.6
가변 방사율 라디에이터는 우주환경에서 작동하는 장비의 온도가 낮을 때는 방사율이 낮아져시스템의 외부로의 열 손실을 줄이고, 반대로 온도가 높은 때는 방사율이 높아져 장비의 열을 외부로방출할 수 있어 효율적인 열제어가 가능하게 한다. 가변 방사율 소재로 보편적으로 이용하고 있는 것중 하나인 감온변색 장치(thermochromics device)는 추가적인 장비 필요 없이 열제어가 가능하기 때문에효율적이고 고장이 발생하지 않는 장점을 가지고 있다. 본 연구는 이와 같은 이유로 감온변색 장치의소재 중 하나인 LSMO(La1-xSrxMnO3)채택하여 졸-겔(sol-gel)방법을 이용하여 제작하고, 제작된 샘플의가변방사 성능을 실험적으로 규명하였다. 또한, 진공환경과 극저온 환경에 반복 노출시켜 시편이 극심한환경 변화 이후에도 방사율 값이 일정함을 확인하여 우주적합성을 판단하였다.
2 차원 금속 회절격자를 이용한 태양에너지 흡수판의 설계 및 분석
한선우(Sunwoo Han),이현진(Hyun Jin Lee),이봉재(Bong Jae Lee) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
In this work, we demonstrated the effective solar absorber by using two-dimensional gratings made of nickel or stainless steel. Because the solar spectrum between 500 ㎚ ? 2000 ㎚ contributes about 91% of total solar energy, structure’s absorptance value close to the unity is desirable within the aforementioned spectral range in order to efficiently harness the solar radiation. To estimate the spectral absortance, we employed the rigorous coupled-wave analysis (RCWA), which computes diffracted field by a given periodic structure. For the optimization of two-dimensional grating structures, we applied Taguchi’s method.
스월-안정화 연소기에서 혼합기 공진모드가 동적 연소특성에 미치는 영향
한선우 ( Sunwoo Han ),이신우 ( Shinwoo Lee ),황동현 ( Donghyun Hwang ),안규복 ( Kyubok Ahn ) 한국분무공학회 2022 한국액체미립화학회지 Vol.27 No.1
Hot-firing tests were performed to experimentally confirm the effect of the eigenmode in the fuel-air mixing section on combustion instability by changing mixing section length, inlet mean velocity, equivalence ratio, and swirler geometry. A premixed gas composed of air and ethylene was supplied to the combustion chamber through an mixing section and an axial swirler. As the mixing section length increased, the inlet velocity perturbation decreased, but the combustion instability increased more. It was found that the resonance frequency of the first longitudinal mode in the mixing section shifted to the third longitudinal mode as the length of the mixing section increased. The results implied that the transition of the resonace frquency by changing the length of the mixing section might cause combustion instability.
(La, Sr)MnO<SUB>3</SUB>을 이용한 가변 방사율 소재에 관한 연구
한선우(Sunwoo Han),최봉수(Bongsu Choi),송태호(Tae-Ho Song),김성진(Sun Jin Kim),이봉재(Bong Jae Lee) 대한기계학회 2013 大韓機械學會論文集B Vol.37 No.6
가변 방사율 라디에이터는 우주환경에서 작동하는 장비의 온도가 낮을 때는 방사율이 낮아져 시스템의 외부로의 열 손실을 줄이고, 반대로 온도가 높은 때는 방사율이 높아져 장비의 열을 외부로 방출할 수 있어 효율적인 열제어가 가능하게 한다. 가변 방사율 소재로 보편적으로 이용하고 있는 것 중 하나인 감온변색 장치(thermochromics device)는 추가적인 장비 필요 없이 열제어가 가능하기 때문에 효율적이고 고장이 발생하지 않는 장점을 가지고 있다. 본 연구는 이와 같은 이유로 감온변색 장치의 소재 중 하나인 LSMO(La1-xSrxMnO3)채택하여 졸-겔(sol-gel)방법을 이용하여 제작하고, 제작된 샘플의 가변방사 성능을 실험적으로 규명하였다. 또한, 진공환경과 극저온 환경에 반복 노출시켜 시편이 극심한 환경 변화 이후에도 방사율 값이 일정함을 확인하여 우주적합성을 판단하였다. Variable emittance radiators can be used in a thermal management system in space because their total emittance changes depending on the temperature of the system. When the temperature of the system decreased, the emittance also decreased so as to minimize the heat loss to the environment. In contrast, when the temperature of the system increased, the emittance also increased such that radiation cooling could occur. Thermochromic materials, whose emittance is a function of the temperature, are often used in variable emittance radiators because no additional parts are needed. In this study, we fabricated a variable-emittance coating by using a sol-gel method based on LSMO (La1-xSrxMnO3) and experimentally characterized the emittance change with respect to temperature. Furthermore, we also examined the stability of LSMO film in space environments by exposing it to extremely low pressure and temperature.