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朴楨日,蔡相洛 嶺南大學校 工業技術硏究所 1995 工業技術硏究所論文集 Vol.23 No.1
There are many complex industrial processes which cannot be satisfactorily controlled by conventional controller due to the unavailability of quantitative data regarding input-output relations. Thus we introduce the self-learning fuzzy controller which can satisfactorily control the dynamic system such as the inverted pendulum in this paper. The introduced self-learning fuzzy controller is based on the principles of approximate reasoning, while its learning is provided by neuron-like elements(ASE, ACE) which are derived from animal learning behavior. Specially we propose the parallel control algorithm which is able to control the angle of inverted pemdulum and position of cart at the same time. Simulation results are presented to demonstrate the performance and applicability of the proposed parallel control method. Also we noticed that the proposed controller is valid with experiment.
유전체 공진기를 이용한 개인휴대 통신용 대역통과 필터의 설계 및 구현
권정열,이헌용,홍성용,윤중락 明知大學校 産業技術硏究所 1996 産業技術硏究所論文集 Vol.15 No.-
In this paper, the band pass filter for personal communication services was constructed and designed using λ/4 TEM mode dielectric resonators with a (Zr0.65,Sn0.35)ATi1.04O4.04 ceramic of dielectric constant εr=37.8, Qxfo=48.600 temperature coefficient of resonant frequency rf=7ppm/˚C, and Unloaded-Q (Qo) of λ/4 TEM mode dielectric resonator with inner hole size 0.9㎜ and external size 3㎜ using silver electrode is 354.5 at 1950MHz. For the band pass filter design and construction, the design theory and simulation results of band pass filter using J-inverter theory have been studied. The parameters which are evaluated by design theory are practically applied to the filter construction and the simulation results are in agreement with the measured results after fine tunnings.
음향 Intensity방법을 이용한 음원 재구성에 관한 연구
金禮顯,張浩京,李俊河,金廷洛 嶺南大學校 基礎科學硏究所 1990 基礎科學硏究 Vol.10 No.-
The amplitude and the location of sound sources are obtained by measuring the acoustic intensity using two closely spaced microphones. In this study, in order to identify the noise radiation characteristics, noise radiational pattern on the right hand side, the left hand side and the front part of the vaccum cleaner are investigated at 315Hz, 630Hz, 1600Hz, and 8000Hz resectively. As the results of experiment, the air induction pipe is verified the important noise radiation at 315Hz and 630Hz, and the air exhaust pipe at 1600Hz. Above all, the moter and the fan influenced at the high frequency of 8000Hz.
Electrical Characteristics of Multilayered Ceramic Capacitors Depending on BaTiO 3 Particle Size
Jung Rag Yoon,Min-Kee Kim 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.6
Multilayer ceramic capacitors were prepared with BaTiO 3 -based ceramics of diff erent grain sizes (150–500 nm), having appropriate dielectric properties and high-temperature stability. The grain size eff ect on the dielectric properties and insulation resistivity of fi ne-grained BaTiO 3 ceramics at room temperature and high temperatures under electric fi elds were investigated. The reduction in particle size has a strong eff ect on DC-bias characteristics and withstanding voltage characteristics per unit thickness. BaTiO 3 ceramic capacitor with smaller grains had higher reliability under the DC bias and higher withstanding voltage per unit thickness due to the shell with para-electricity. The highly accelerated lifetime test showed that the insulation resistance with smaller particle size exhibited one order higher as the voltage increases at higher temperatures and the samples with a size of 500 nm had a sharp drop in insulation resistance at 200 V. Small particles (150, 250 nm) have a smaller product of insulation resistance and capacity than larger particles (500 nm). But, the withstanding voltage per unit thickness of the small particles (150, 250 nm) was 82, 71 V/μm, respectively, which was greater than 58 V/μm of the larger particles (500 nm). This is thought to be an eff ect of suppressing the movement of defects in the smaller particles because small grains have many grain boundaries.
Jung-Rag Yoon,Bong Hwa Moon,Heun Young Lee,Dae Yong Jeong,Dong Hee Rhie 대한전기학회 2013 Journal of Electrical Engineering & Technology Vol.8 No.4
Multilayer capacitors with high ripple current and high capacitance were manufactured. The electrical properties of these capacitors were characterized for potential application for DC-link capacitors in hybrid electric vehicle inverters. Internal electrode structures were designed to achieve high capacitance and reliability. A single multilayer capacitor showed 0.46 3F/cm₃ of capacitance, 0.65% of dielectric loss, and 1450 V to 1650 V of dielectric breakdown voltage depending on the design of the internal electrode. The capacitor module designed with several multilayer capacitors gave a total capacitance of 450 3F, which is enough for hybrid electric vehicles. In particular, an equivalent series resistance of 4.5 m7 or less will result in 60 Arms, thereby reaching the allowed ripple current for hybrid electric vehicles.
Jung Rag Yoon,Chang-Bae Lee,이석원,이헌용 한국전기전자재료학회 2012 Transactions on Electrical and Electronic Material Vol.13 No.6
(1-X)(Na0.5K0.5)NbO3-XK5.4Cu1.3Ta10O29 (NKN-KCT) lead-free piezoelectric ceramics have been synthesized by the conventional solid state sintering method, and their sinterability and piezoelectric properties were investigated. Typically, this material is sintered between 1,025 and 1,100℃ for 2 hours to achieve the required densification. Crystalline structures and Microstructures were analyzed by X-ray diffraction and scanning electron microscope. The density, dielectric constant (εr), piezoelectric constant d33, electromechanical coupling factor kp and mechanical quality factor Qm value of the NKN ceramics depended upon the KCT content and the sintering temperature. In particular, the KCT addition to NKN greatly improved the mechanical quality factor Qm value. The ceramic with X =1.0 mol% sintered at 1,050℃ exhibited optimum properties (εr= 246, d33= 95, kp= 0.38 and Qm= 1,826). These results indicate that the ceramic is a promising candidate material for applications in lead free piezoelectric transformer and filter materials.
(Ba, Ca)(TiZr)O₃ 세라믹을 적용한 적층 칩 커패시터의 전기적 특성
尹重洛(Jung-Rag Yoon),余東勳(Dong-Hun Yeo),李憲用(Heun-Young Lee),李錫原(Suk Won Lee) 대한전기학회 2006 전기학회논문지C Vol.55 No.1
The effect of A/B mol ratios and sintering temperatures on dielectric properties and microstructure of (Ba<SUB>0.93</SUB>Ca<SUB>0.07</SUB>)m(Ti<SUB>0.82</SUB>Zr<SUB>0.18</SUB>)O₃ ceramics were investigated. The dielectric constant decreased with increasing the A/B mol ratio. However, the dielectric loss is improved. As the dielectric properties of A/B mol ratio with m = 1.009 at sintered temperature 1260℃, we obtained dielectric constant 12,800, dielectric loss 3.5% and Y5V temperature characteristics. Highly reliable Ni-MLCCs, 1.6㎜ (length) × 0.8㎜ (width) × 0.8㎜ (height) with capacitance of 1.23 ㎌ and dissipation loss of 5.2% were obtained employing dielectric material composed of (Ba<SUB>0.93</SUB>Ca<SUB>0.07</SUB>)1.009(Ti<SUB>0.82</SUB>Zr<SUB>0.18</SUB>)O₃ - MnO₂ 0.2wt% - Y₂O₃ 0.18wt%. - SiO₂ 0.15wt% - (Ba<SUB>0.4</SUB>Ca<SUB>0.6</SUB>)SiO₃ 1 wt%.
Yoon, Jung-Rag,Lee, Chang-Bae,Lee, Kyung-Min,Lee, Heun-Young,Lee, Serk-Won The Korean Institute of Electrical and Electronic 2009 Transactions on Electrical and Electronic Material Vol.10 No.5
The microstructure and the electrical properties of a ZnO varistor, which was composed of a ZnO-$Bi_2O_3$-$Sb_2O_3$-CoO- $MnO_2$ -NiO-$Nd_2O_3$ system, were investigated at various $Y_2O_3$ addition concentrations. $Y_2O_3$ played a role in the inhibition of the grain growth. As the $Y_2O_3$ content increased, the average grain size decreased from $6.8{\mu}m$ to $4{\mu}m$, and the varistor voltage($V_{1mA}$) greatly increased from 275 to 400 V/mm. The nonlinearity coefficient ($\alpha$) decreased from 72 to 65 with increasing $Y_2O_3$ amount. On the other hand, the leakage current ($I_L$) increased from 0.2 to 0.9 ${\mu}A$. These results confirmed that doping the varistors with $Y_2O_3$ is a promising production route for production of a higher fine-grained varistor voltage ($V_{1mA}$) which can dramatically reduce the size of the varistors.