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풍력터빈 요 오정렬 보정에 따른 진동 저감 및 출력성능 향상 실증 연구
김병택,김태형,강보신,고경남,현명택 한국기계기술학회 2019 한국기계기술학회지 Vol.21 No.2
In this study, the yaw misalignment value of wind turbine was measured using Lidar and it was analyzed the effect of vibration reduction and power performance improvement when applied to turbine. It was confirmed that the vibration of the main bearing and the gear box of the wind turbine was partially reduced. Also it was found that the output performance was improved when the wind speed was over 8m/s. As a result, it was also found that the annual energy production(AEP) was improved when the average annual wind speed of the wind farm was over 6m/s. Converted to AEP, the AEP improved about 1% and 4%, when the annual wind speed was 6m/s and 11m/s respectively, which resulted in an improvement of about 1~4% through the yaw misalignment correction of the wind turbine.
金柄澤,金壯烈 成均館大學校 1982 論文集 Vol.32 No.-
The general shapes of the angular distributions of nuclear reactions induced by heavy-ions are studied in terms of the semi-classical theory. The Fourier transformation of angular distributions into ι-space, which is the direct consequence of the direct consequence of the quantum mechanical complementarity between angle and angular momentum, can inform us where nuclear reactions are localized. The angular distribution of ^(28)Si(^(15)N, ^(14)N)^(29)Si reaction is analyzed and the localization obtained from this analysis agrees well with that from the quantum mechanical calculations.
50nm 급 낸드플래시 메모리에서의 Program/Erase 스피드 측정을 통한 트랩 생성 분석
김병택,김용석,허성회,유장민,노용한,Kim, Byoung-Taek,Kim, Yong-Seok,Hur, Sung-Hoi,Yoo, Jang-Min,Roh, Yong-Han 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.4
A novel characterization method was investigated to estimate the trap generation during the program /erase cycles in nand flash memory cell. Utilizing Fowler-Nordheim tunneling current, floating gate potential and oxide electric field, we established a quantitative model which allows the knowledge of threshold voltage (Vth) as a function of either program or erase operation time. Based on our model, the derived results proved that interface trap density (Nit) term is only included in the program operation equation, while both Nit and oxide trap density (Not) term are included in the erase operation equation. The effectiveness of our model was tested using 50 nm nand flash memory cell with floating gate type. Nit and Not were extracted through the analysis of Program/Erase speed with respect to the endurance cycle. Trap generation and cycle numbers showed the power dependency. Finally, with the measurement of the experiment concerning the variation of cell Vth with respect to program/erase cycles, we obtained the novel quantitative model which shows similar results of relationship between experimental values and extracted ones.