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Wei Li,Jiang Lu,YoungWoo Jeong(정영우),ChangSeop Koh(고창섭) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
A novel solving technique has been developed to analyze the dynamic characteristics of high speed Thomson-coil arc eliminator. The electromagnetic repulsion actuator based on Thomson-coil is taken as the driving part of the arc eliminator, due to which, the opening and closing time is quite short compare to other type actuators. The electromagnetic repulsion actuator is composed of one repulsion plate and two fixed coils, corresponding to the opening coil and closing coil, respectively. The new solving technique is derived based on the equivalent electric circuit model of the system which is set up by dividing the repulsion plate into multi segments using adaptive segmentation method. This solving technique is applied to the dynamic characteristic analysis of electromagnetic repulsion actuators in high speed Thomson-coil arc eliminators. The calculation results are testified by the FEM calculation results and experiment results.
K<sub>2</sub>SiF<sub>6</sub>:Mn<sup>4+</sup> 적색형광체의 발광 특성
최희락 ( Heelack Choi ),정영우 ( Youngwoo Jeong ),강태욱 ( Taewook Kang ),( Gemechu Deressa ),김종수 ( Jongsu Kim ),김대원 ( Daeweon Kim ) 한국화상학회 2016 한국화상학회지 Vol.22 No.4
적색 K<sub>2</sub>SiF<sub>6</sub>:Mn<sup>4+</sup> 형광체는 SiO<sub>2</sub> in/HF/KMnO<sub>4</sub>H<sub>2</sub>O solution 용액의 산화환원 반응에 의해 합성된다. 이 형광체 는 450 nm 이하의 파장에서 여기되어 Mn<sup>4+</sup>의 <sup>2</sup>E<sub>g</sub> → <sup>4</sup>A<sub>2g</sub>에 의해 반치폭이 10 nm인 약 634 nm의 적색 빛을 발광한다. 입자의 크기는 약 5 ㎛이고 결정구조는 Fm-3m (225)의 공간군을 가지는 입방정계이다 (JCPDS85-1382). 온도의존 발광 스펙트럼에서는 약 175 ℃에서의 발광강도가 상온에서보다 66 %까지 감소하였다. 이 형광체는 청색 발광을 하는 InGaN LED에 의해 효과적으로 여기 될 수 있어서 녹색이나 황색 형광체와 함께 사용하여 연색지수가 높은 백색 LED를 만들 수 있다. Deep-red K<sub>2</sub>SiF<sub>6</sub>:Mn<sup>4+</sup> phosphor was synthesized by are doxreaction of SiO<sub>2</sub> in/HF/KMnO<sub>4</sub>H<sub>2</sub>O solution. Under the 450 nm excitation, it shows an arrow deep-red emitting around 634 nm which is attributed to the <sup>2</sup>E<sub>g</sub> to <sup>4</sup>A<sub>2g</sub> transition of Mn<sup>4+</sup> ion with the halfwidth of 10nm. Its size was approximately 5 ㎛. It has a single phase of cubic structure with a space group of Fm-3m (225) with JCPDS # 85-1382. In the temperature dependence of emission spectra, their intensities decrease to 66 % of that at room temperature is about 175 ℃. These phosphors can be efficiently excited by the blue light emitting InGaN diode and provides a high color rendering property with green or yellow phosphors.