• 제목/요약/키워드: Seon-bi

검색결과 122건 처리시간 0.028초

비시변 시비율 전달함수 구현에 의한 양방향 충전기 제어특성 개선 (Implementation of Non-time-varying Duty Ratio Transfer Function for Improvement of Control Characteristics Bi-directional Charger)

  • 황정구;김선필;한상택;김기선;추영배;박성준
    • 전력전자학회논문지
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    • 제19권2호
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    • pp.124-132
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    • 2014
  • In this paper, we implement a non-time-varying transfer function of the duty ratio to improve the control characteristics in a control system that Input voltage and the output voltage is varied, DC / DC converters for bi-directional charging. When control is performed with using controller gain of conventional design, characteristics of the control is varied to fluctuations of the input voltage. The proposed method is the equivalently removing method for duty ratio in entire control block, by voltage controller gain is changed for inverse of the duty ratio. The proposed non-time-varying duty ratio transfer function is applied to DC / DC converter for bi-directional charging. In this paper, feasibility and superiority is verified through PSIM simulations and experiments.

$Bi_{4-x}Y_{x}Ti_{3}O_{12}$ [BYT] 강유전 박막의 강유전 특성 (Ferroelectric Properties of Ferroelectric $Bi_{4-x}Y_{x}Ti_{3}O_{12}$ Thin Films)

  • 이의복;김재식;배선기;이영희
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 추계학술대회 논문집 전기물성,응용부문
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    • pp.87-89
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    • 2005
  • $Bi_{3.25}Y_{0.75}Ti_{3}O_{12}$[BYT] ferroelectric thin films were deposited by RF-Sputtering method on the $Pt/Ti/SiO_2/Si$. We investigated the effects of processing condition (especially post-annealing) on the structural and ferroelectric properties of the BYT thin films. Increasing the annealing temperature, the peak intensity of (117) increased and c-axis orientation decreased. The BYT thin films crystallized well at $600^{\circ}C$ for 30min. No secondary phases observed in the XRD pattern. At annealing temperature of $700^{\circ}C$, the thin films had no cracks and the grain was uniform. The calculated lattice constants of BYT thin films were a=0.539nm, b=0.536nm, c=3.288nm. The remnant polarization of the $Bi_{3.25}Y_{0.75}Ti_{3}O_{12}$ capacitor reached $1.8uC/cm^2$ at an applied field about 400kV/cm. The BYT thin films can be used as capacitors in Ferroelectric Random Access Memory device.

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Determination of Cadmium(II) and Copper(II) by Flame Atomic Absorption Spectrometry after Preconcentration on Column with Pulverized Amberlite XAD-4 with Bismuthiol I

  • Park, Dong-Seok;Choi, Hee-Seon
    • Bulletin of the Korean Chemical Society
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    • 제28권8호
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    • pp.1375-1382
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    • 2007
  • A column preconcentration method with pulverized Amberlite XAD-4 loaded with bismuthiol I (BI) has been developed for the determination of trace Cd(II) and Cu(II) in various real samples by flame atomic absorption spectrophotometry. Various experimental conditions, such as the size of XAD-4, adsorption flow rate, amount of bismuthiol I, stirring time for adsorbing bismuthiol I on XAD-4, pH of sample solution, amount of XAD-4- BI, desorption solvent, and desorption flow rate, were optimized. Also, the adsorption capacity and the adsorption rate of Cd(II) and Cu(II) on XAD-4-BI were investigated. The interfering effects of various concomitant ions were investigated, Bi(III), Sn(II) and Fe(III) were found to affect the determination. But the interference by these ions was completely eliminated by adjusting the amount of XAD-4-BI resin to 0.70 g, although the adsorption flow rate was slower. For Cd(II) our proposed technique obtained a dynamic range of 0.5-40 ng mL-1, a correlation coefficient (R2) of 0.9913, and a detection limit of 0.3 ng mL-1. For Cu(II), the corresponding values were 2.0-120 ng mL-1, 0.9921 and 1.02 ng mL-1. To validate this proposed technique, the aqueous samples (stream water, reservoir water, tap water and wastewater), the diluted brass sample and the plastic sample, as real samples, were used. Recovery yields of 91-103% were obtained. These measured data were not different from ICP-MS data at 95% confidence level. Our proposed method was also validated using rice flour CRM (normal, fortified) samples. From the results of our experiment, we found that the technique we present here can be applied to the determination of Cd(II) and Cu(II) in various real samples.

Bi(NiaX1-a)O3-PbTiO3 계 압전 신조성(X-Ti,Nb)의 내전압 특성 향상 (Improvement of the Resistivity in High Field for the New Piezoelectric Compositions in the Bi(NiaX1-a)O3-PbTiO3(X=Ti,Nb) System)

  • 최순목;서원선
    • 한국세라믹학회지
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    • 제45권4호
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    • pp.220-225
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    • 2008
  • Lead-free ferroelectric ceramics are widely researched today for industrial applications as sensors, actuators and transducers. Since $Pb(Zr_aTi_{1-a})O_3$-(PZT) has high Curie temperature($T_C$), high piezoelectric properties near its morphotropic phase boundary(MPB) composition and small temperature dependence electrical behavior, it has been used to commercial materials for wide temperature range and different application fields. According to the tolerance factor concept, since the $Bi^{3+}$ cation with 12-fold coordinate has a smaller ionic radius than 12-fold coordinate $Pb^{2+}$, most bismuth based perovskites possess a smaller tolerance factor. Therefore, MPBs with a higher $T_C$ may be expected in $Bi(Me^{3+})O_3PbTiO_3$ solid solutions. As in lead based perovskite systems, it is clear that we need to explore more materials in simple or complex bismuth based MPB systems. The objective of this study is to investigate the $Bi(Ni_{1_a}X_a)O_3-PbTiO_3(X=Ti^{4+},\;Nb^{5+})$ perovskite solid-solution. For improving the electronic conduction problem, the magnesium and manganese modified system was also studied.

겨울철 융설을 대비한 바이모달 트램 재해관리 시스템의 SWMM 모형 적용성 평가 (Evaluation of SWMM Model Adjustment for Rubber-tired Tram Disaster Management System against the Snow-melt during the Winter)

  • 김종건;박영곤;윤희택;박윤식;장원석;유동선;임경재
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2008년도 추계학술대회 논문집
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    • pp.56-60
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    • 2008
  • Increasing urban sprawl and climate changes have been causing unexpected high-intensity rainfall events. Thus there are needs to enhance conventional disaster management system for comprehensive actions to secure safety. Therefore long-term and comprehensive flood management plans need to be well established. Recently torrential snowfall are occurring frequently, causing have snow traffic jams on the road. To secure safety and on-time operation of the Bi-modal tram system, well-structured disaster management system capable of analyzing the urban flash flooding and snow pack melt/freezing due to unexpected rainfall event and snowfall are needed. To secure safety of the Bi-modal tram system due to torrential snowfall, the snow melt simulation capability was investigated. The snow accumulation and snow melt were measured to validate the SWMM snow melt component. It showed that there was a good agreement between measured snow melt data and the simulated ones. Therefore, the Bi-modal tram disaster management system will be able to predict snow melt reasonably well to secure safety of the Bi-modal tram system during the winter. The Bi-modal tram disaster management system can be used to identify top priority area for snow removal within the tram route in case of torrential snowfall to secure on-time operation of the tram. Also it can be used for detour route in the tram networks based on the disaster management system predicted data.

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