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조정민,전기영,함년근,이승환,이훈구,한경희 명지대학교 대학원 1999 대학원논문집 Vol.3 No.-
The conventional PI controller are fragile in parameter variation and load-variation. Therefore, in this paper, a speed control algorithm based on the Fuzzy PI controller is proposed for the high performance speed control of a voltage ?? inverter to drive 3-phase induction motors. The computer simulation and experiment results show that the proposed controller are more excellent control characteristics than conventional PI controller in transient-state and steady-state response.
Interfacial Properties in Cu-phthalocyanine-based Hybrid Inorganic/Organic Multilayers
Nyun Jong Lee,Eisuke Ito,Yu Jeong Bae,Tae Hee Kim 한국자기학회 2012 Journal of Magnetics Vol.17 No.4
Interfacial properties of 5 nm MgO(001)/7 nm Fe(001)/1.8 nm MgO(001)/t nm Cu-phthalocyanine (CuPc) hybrid multilayers with t = 0, 1, 7, and 10 were investigated by using x-ray photoemission spectroscopy (XPS). Rather sharp interfacial properties were observed in the CuPc films grown on an epitaxial MgO/Fe/MgO(001) trilayer than a MgO/Fe(001) bilayer. This work suggests a new way to improve device performance of organic spintronic devices by utilizing an artificially grown MgO(001) thin layer.
Spin dependent light emission in organic light emitting diodes with single ferromagnetic electrode
Nyun Jong Lee,Yu Jeong Bae,Heeyoung Jung,Changhee Lee,Tae Hee Kim 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
We report an enhanced magneto-electroluminescence (MEL) in organic light-emitting diodes (OLEDs) consisting of a non-magnetic Al and a magnetic electrode of BCC-Fe(001)/MgO(001). A role of spin states of injected carrier from anode in the OLEDs was elucidated by employing different ferromagnetic (FM) anodes, such as polycrystalline-Fe, epitaxial Fe(001), and epitaxial Fe(001)/MgO(001). Organic layers consist of a traditional structure of CuPc/α-NPD/Alq<sub>3</sub>. The relatively larger MEL of ~ 6% was observed in the devices with Fe(001)/MgO(001) anode at room temperature in a low magnetic field of 0.1 T for an applied voltage in excess of ~ 5 volts, whereas these measurements revealed less than 3% for the non-fully spin polarized FM anodes. Our experimental results can be explained in terms of increasing the internal quantum efficiency during exciton formation in emission layer based on electron-hole pair model and clearly suggest the inserting of epitaxial MgO(001) layer improves spin-polarized hole injection resulting in enhanced MEL.