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Inter - grain Exchange Interactions for Nanocrystalline Nd2.33Fe₁₄B1.06Si0.21 Magnets
Jin Hanmin,Yan Yu,Wang Xuefeng,Su Feng 한국자기학회 2003 Journal of Magnetics Vol.8 No.4
The strengths of the inter-grain exchange interaction were evaluated for nanocrystalline Nd_(2.33)Fe₁₄B_(1.06)Si_(0.21) magnets of different grain size by comparing the iHc calculated by micromagnetics with the experiments. With increase of the grain boundary thickness to that of the magnet of grain diameter 12.4, 24.8, 37.2 and 49.6 ㎚, the strengh of the interaction in reference to that without the grain boundary phase decreases to 83%, 69%, 54% and 42%.
이클립스 UML과 GMF 기반 UML 다이어그램 시뮬레이션 프레임워크 설계
맹한민 ( Hanmin Maeng ),신영술 ( Youngsul Shin ),이우진 ( Woo Jin Lee ) 한국정보처리학회 2007 한국정보처리학회 학술대회논문집 Vol.14 No.2
이클립스의 UML2 와 GMF 프로젝트는 UML 다이어그램 편집기를 개발하는데 있어서 기본적인 프레임워크를 지원한다. 일반적으로 UML 을 이용하여 시스템을 설계할 때에는 여러 가지의 다이어그램을 제작하게 되는데, 이때 각 다이어그램간의 일관성을 유지시키는 것과 설계된 모델에 대한 시뮬레이션은 아주 중요한 기능요소이다. 이 논문에서는 이클립스의 UML2 와 GMF 를 기반으로 한 UML 다이어그램 시뮬레이션 프레임워크를 제안한다.
Jongho Seo,Jin-Su Kim,Un-Chang Jeong,Yong-Dae Kim,Young-Cheol Kim,Hanmin Lee,Jae Eung Oh 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.3
In this study, we derived an equation of motion for an electromechanical system in view of the components and working mechanism of an electromagnetic-type energy harvester (ETEH). An electromechanical transduction factor (ETF) was calculated using a finite-element analysis (FEA) based on Maxwell’s theory. The experimental ETF of the ETEH measured by means of sine wave excitation was compared with and FEA data. Design parameters for the stationary part of the energy harvester were optimized in terms of the power performance by using a response surface method (RSM). With optimized design parameters, the ETEH showed an improvement in performance. We experimented with the optimized ETEH (OETEH) with respect to changes in the external excitation frequency and the load resistance by taking human body vibration in to account. The OETEH achieved a performance improvement of about 30% compared to the initial model.
Seok-Chan Kim,Jin-Gyun Kim,Young-Cheol Kim,양석조,Hanmin Lee 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.6 No.4
The aim of this study is to optimize the electromagnetic vibration energy harvesters with typical cylindrical shape considering the aspect ratio. In the optimization procedure, voltage and power, which are two key factors of energy harvesting systems, are mainly considered in the three types of electromagnetic vibration energy harvester according to various aspect ratios. We then investigate the optimum design parameters in each case. The results show that there is an optimum aspect ratio that maximizes the output voltage and power for the same volume. We also find that the optimum design parameters for each aspect ratio have a relatively constant value regardless of the aspect ratio. An experimental study is also conducted to verify the simulation results of the design optimization, and it clearly confirms that the proposed optimization result matches the experimental results well.