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ARCS모형에 근거하여 실습을 병행한 미생물학수업이 간호대학생의 학습동기에 미치는 효과
김보환(Bo-Hwan KIM),형희경(Hee-Kyoung HYOUNG) 한국수산해양교육학회 2014 水産海洋敎育硏究 Vol.26 No.6
The purpose of this study was tried to identify the effect of nursing students’ learning motivation in microbiology through microbiology laboratory practice based on the Keller’s ARCS model. In order to achieve this research, this study was designed a quasi-experimental pre-post tests control group. Experimental group received a microbiology theory and practice based on ARCS model and control group received microbiology theory only. To identify the microbiology learning motivation effect to nursing student, we measured learning motivation by Keller’s ARCS model that consisted of attention, relevance, confidence, and satisfaction. The major results of the experimental group showed significantly higher level of total learning motivation and all four subcategories compared to control group. Based upon the above results, microbiology laboratory practice might be beneficial for the nursing students to motivate microbiology learning.
김보환(Bo-Hwan Kim),이경태(Kyung-Tae Lee),김해동(Hae-Dong Kim),유진선(Jin-Sun Yoo) 한국추진공학회 2018 한국추진공학회 학술대회논문집 Vol.2018 No.5
초음속 흡입구에 사용되는 블리드 출구의 유동특성을 알아보기 위해 30°와 15° 각도를 갖는 루버 형상에 대해 수치해석을 수행하였다. 본 논문에서는 plenum chamber의 압력비에 따른 유량비 데이터를 확인하였고, 전산유체해석을 위해 상용소프트웨어인 Fluent v18.0을 사용하였다. 해석결과, 루버 주변에 충격파와 팽창파 등의 복잡한 유동패턴을 확인하였으며, 15° 루버의 경우에서 이러한 물리적 현상들이 완화되는 것을 확인하였다. Numerical simulations of the flow through the louver structure with 30° and 15° angles were conducted to investigate the flow characteristics of the bleed exit louvers used in supersonic inlet. In this paper, the sonic flow coefficient according to the pressure ratio of the plenum chamber was confirmed, and the commercial software Fluent v18.0 was used for computational fluid dynamics analysis. As a result of the analysis, complex flow patterns such as shock and expansion wave were confirmed around the louvers, and it was confirmed that these physical phenomena were alleviated in the case of the 15° louvers.
SIR 기반의 셀룰러 무선망에서 전송 전력 제어 알고리듬의 성능 비교
정보환(Bo-Hwan Jung),김문갑(Moon-Gab Kim) 대한전자공학회 2009 電子工學會論文誌-TC (Telecommunications) Vol.46 No.5
이 논문에서는 SIR 기반의 셀룰러 무선망에서 전송 전력 제어 알고리듬들의 성능을 수치실험을 통해 평가하였다. 이를 위해 SIR 기반의 연속 및 이산 시간 전송 전력 제어 알고리듬을 하나로 통합된 동적 상태 방정식으로 표현하였다. 수치실험은 연속성을 갖는 외란 환경 하에서 수행되었다. 수치실험 결과 본 논문에서 제안한 전송 전력 제어 알고리듬이 보다 우수한 외란 제거 성능을 명백히 보여 준다. In this paper, we evaluate a performance on a transmission power control algorithm in a SIR-based wireless networks. We consider the existing iterative power control algorithms into a unified dynamic state system formulation in both continuous-time and discrete-time system. Numerical experiments are performed under the disturbance of sinusoidal. These results indicate that the proposed power control scheme has a performance improvement with a better disturbance elimination in wireless mobile systems.
Al 그리드와 ZnO 투명전도막 의 공정변화에 따른 Cu(In,Ga)Se₂ 박막태양전지의 특성 연구
조보환(Bo Hwan Cho),김선철(Seon Cheol Kim),문선홍(Sun Hong Mun),김승태(Seung Tae Kim),안병태(Byung Tae Ahn) 한국태양광발전학회 2015 Current Photovoltaic Research Vol.3 No.1
CIGS solar cell consisted of various films. In this research, we investigated electrode materials in Cu(In,Ga)Se₂ (CIGS) cells, including Al-doped ZnO (ZnO:Al), intrinsic ZnO (i-ZnO), and Al films. The sputtered ZnO:Al film with a sputtering power at 200W showed the lowest series resistance and highest cell efficiency. The electrical resistivity of the 200-W sputtered ZnO:Al film was 5.2x10<SUP>-4</SUP>Ω?cm by the rapid thermal annealing at 200°C for 1 min. The electrical resistivity of i-ZnO was not measurable due to its high resistance. But the optical transmittance was highest with less oxygen supply and high efficiency cell was achieved with O₂/(Ar+O₂) ratio was 1% due to the increase of short-circuit current. No significant change in the cell performance by inserting a Ni layer between Al and ZnO:Al films was observed.
Al 그리드와 ZnO 투명전도막 의 공정변화에 따른 Cu(In,Ga)Se<sub>2</sub> 박막태양전지의 특성 연구
조보환,김선철,문선홍,김승태,안병태,Cho, Bo Hwan,Kim, Seon Cheol,Mun, Sun Hong,Kim, Seung Tae,Ahn, Byung Tae 한국태양광발전학회 2015 Current Photovoltaic Research Vol.3 No.1
CIGS solar cell consisted of various films. In this research, we investigated electrode materials in $Cu(In,Ga)Se_2$ (CIGS) cells, including Al-doped ZnO (ZnO:Al), intrinsic ZnO (i-ZnO), and Al films. The sputtered ZnO:Al film with a sputtering power at 200W showed the lowest series resistance and highest cell efficiency. The electrical resistivity of the 200-W sputtered ZnO:Al film was $5.2{\times}10^{-4}{\Omega}{\cdot}cm$ by the rapid thermal annealing at $200^{\circ}C$ for 1 min. The electrical resistivity of i-ZnO was not measurable due to its high resistance. But the optical transmittance was highest with less oxygen supply and high efficiency cell was achieved with $O_2/(Ar+O_2)$ ratio was 1% due to the increase of short-circuit current. No significant change in the cell performance by inserting a Ni layer between Al and ZnO:Al films was observed.