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정윤미(Yun-Mi Jeong),최은지(Eun-Ji Choi),김영달(Young-Dal Kim) 대한전기학회 2013 전기학회논문지 Vol.62 No.12
Most cases of power transformer failure are caused by physical factors linked to the transient vibrations of multiple 120Hz combinations. In addition, the noise generated in the transformer from this vibration not only directly contributes to the worsening of the work environment but also causes psychological stress, resulting in the worsening of the workers efficiency and of the living environment of the inhabitants around the power plant. Thus, to remedy these problems, the mechanical-excitation forces working on a power transformer were categorized in this study, and the mechanical-damage mechanism was identified through the vibration transfer paths acting on machines or structures. In addition, a study on active noise cancellation in a transformer using the FXLMS algorithm was conducted to develop a system that is capable of multiple-sound/channel control, which resulted in the active noise reduction effect when applied on the field.
정윤미(Yun Mi Jeong),류점숙(Jom Sook Ryoo),이선정(Seon Jeong Lee),신효식(Hyo Shick Shin) 전남대학교 생활과학연구소 2012 生活科學硏究 Vol.22 No.-
The purpose of this study were to search traits of high-school students self-esteem, school life satisfaction and family life satisfaction, and to examine effective variables influencing on high-school students life satisfaction. The subjects were the 400 high-school students in Jeonnam. Data were analyzed with Frequency, Percentage, Mean, Std, Cronbach s α, and Multiple Regression using SPSS/PC WIN 18.0 program. The major findings were as follows: 1. Self-esteem perceived by the high-school students were cognitive ability 2.74, physical ability 2.84, appearance 2.88, social adaption 3.02, behavioral conduct 3.40, and whole self value 3.10. The school life satisfaction were 3.02 and the family life satisfaction were 3.64. 2. School life satisfaction were influenced whole self value, social adaption, behavioral conduct. And the high-school students school life satisfaction were explained about 20% by these variables. Family life satisfaction were influenced by whole self value, behavioral conduct. And the high-school students family life satisfaction were explained about 20% by these variables. This outcomes indicated that high-school students need efforts to feeling pride and receptive attitude for themselves.
WindPRO를 이용한 태안해안국립공원의 330㎾ 풍력발전단지 조성에 관한 연구
정윤미(Yun-Mi Jeong),김재광(Jae-Kwang Kim),김영달(Young-Dal Kim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.11
본 논문에서는 서산기상대에서 측정된 기상데이터를 이용하여 태안해안국립공원 내의 만리포해수욕장 부근의 풍황 및 발전량을 예측하였다. 이때 풍황 및 발전량 예측은 풍력단지 설계를 목적으로 사용되고 있는 WindPRO의 WAsP-interface모듈을 이용하였다. 이렇게 예측된 풍황을 이용하여 발전단지를 조성하고, PARK 모듈을 사용하여 발전단지의 발전량을 예측하였다.
해상 풍력발전단지 조성에 따른 레이더 전파간섭 저감 기술동향
김영달,정윤미,이대동,Kim, Young-Dal,Jeong, Yun-Mi,Lee, Dae-Dong 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.4
The wind power generation is an eco-friendly clean energy that produces almost zero $CO_2$ emission, and has a good economic feasibility. As for the location, the installation of large turbines and construction of large-scale wind farm is easier on the offshore than on the land. In Korea, it is inevitable to generate offshore wind power through the offshore wind farm, and the radio interference of larger wind power generators and offshore wind power farm to broadcasting, communication and radars is becoming a core issue for constructing the offshore wind farm. In this study, the wind power generation status and rotor blade technology trend were presented, along with the technical trend of radar radio interference reduction relating to construction of the offshore wind farm.