• Title/Summary/Keyword: Discharge cell

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Effect of Protrusion Electrode of the Electro-Optical Characteristics of AC PDP with Long Electrode Gap (Long 전극갭을 가지는 AC PDP의 전기광학적 특성에 미치는 돌기전극의 영향)

  • Heo, Jeong-Eun;Ok, Jung-Woo;Lee, Don-Kyu;Lee, Hae-June;Lee, Ho-Jun;Park, Chung-Hoo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.8
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    • pp.1422-1428
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    • 2008
  • In the current PDP technology, one of the most important issues in AC PDP is improvement of luminance and luminous efficacy. To improve luminance and luminous efficacy, new cell structure of PDP containing long discharge path is necessary. However, it causes an increment of firing voltage. In order to decrease firing voltage of AC PDP having long discharge gap, the protrusion electrode is proposed. To drop the firing voltage, the protrusion electrode is inserted into the forward area of the main discharge gap. This paper presents measurements of detailed optical and electrical characteristics of AC PDP with protrusion electrodes. The experimental results show that the proposed structure with gap 80um has lower firing voltage to 27V than that of the conventional long gap structure. Moreover, the ICCD(Intensified Charge Coupled Device) images of the proposed structure show quick discharge generation by 0.07usec and longer continuation by 0.05usec than that of the conventional long gap structure. Therefore, the proposed protrusion electrodes have higher luminance by 12.5% than that of the conventional structure, as having no decrement of Luminous efficacy.

Electrochemical Simulation for Limited-Discharge Current Prediction of Li-ion Secondary Cell Using High-Rate Discharge (고율 방전용 리튬 전지의 한계 방전 전류 예측을 위한 전기화학 시뮬레이션)

  • Kim, Simon;Lee, Young Shin
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.39 no.8
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    • pp.807-812
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    • 2015
  • Li-ion batteries are energy sources that are widely used in applications such as notebooks, cellular phones, power tools, and vehicles. They are devices in which stored chemical energy is changed to electrical energy by electrochemical reactions. They have a high energy density, small size, and are lightweight. In particular, power tools and vehicles require high charge/discharge rates. Therefore, in this paper, we perform electrochemical simulations using a commercial finite-element analysis program to determine the high discharge-rate characteristics of Li-ion cells. In addition, by performing high discharge-rate simulations, we found that the limited discharge current was 63 A. Based on the results obtained, we investigate the behavior of Li-ion cells with a high rate of discharge.

Electrochemical Characteristics of Hybrid Cell Consisting of Li Secondary Battery and Supercapacitor (리튬이차전지와 슈퍼커패시터로 구성된 하이브리드 셀의 전기화학적 특성)

  • KIM1, SANGGIL;GIL, BOMIN;HWANG, GABJIN;RYU, CHEOLHWI
    • Journal of Hydrogen and New Energy
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    • v.30 no.1
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    • pp.43-48
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    • 2019
  • This study investigates the electrochemical characteristics of the hybrid cell that combined the advantageous characteristics of Li secondary battery and supercapacitor, high energy density and high power density, respectively. Electrochemical behaviors of the hybrid cell was characterized by charge/discharge, cycle and impedance tests. The hybrid cell using Li secondary battery and supercapacitor had better discharge capacity and cycle performance than that of using Li secondary battery only. Proper design of such a hybrid cell system is expected to result in substantial benefits to the well being of the Li secondary battery. The hybrid cell involving Li secondary battery for high energy density and supercapacitor for high power density may be the possible solution for future energy storage system.

The Control Algorithm of Power-conditioner for Stand-alone PV System (독립형 PV시스템용 전력변환기 제어 알고리즘)

  • 정영석;강기환;김홍성;정명웅;유권종;송진수
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • 1998.10a
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    • pp.209-215
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    • 1998
  • This paper deals with stand-alone Photovoltaic system(SPVS) with charge and discharge controller. Main power source of SPVS are generally solar cell and battery. therefore SPVS can be classified into variable types in accordance with connection type between battery and solar cell. Mainly used one of them is direct connection type which has advantages such as simple structure and simple controller. However most big drawback of this system is energy loss by voltage disharmony between solar cell and battery. Therefore SPVS with charge and discharge controller which can operate solar cell at maximum power point is designed and analyzed by simulation in this paper.

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3-D Simulation of T-Shaped Electrode and Comparison of Results with Experiments

  • Shin, Yeong-Kyo;Hwang, Tae-Su;Kang, Seok-Dong;Park, Hun-Gun;Ryu, Jae-Hwa;Kim, Hyun-Chul;Shin, Seong-Won;Lee, Jae-Koo
    • Journal of Information Display
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    • v.3 no.2
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    • pp.13-18
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    • 2002
  • Numerical simulation is one of the most useful tools to study gas discharge phenomena that occur in alternating current plasma display panel (AC-PDP) cell. Most PDP cell simulations have been performed for two-dimensional cell, is cross-section along the address electrode. We developed a three-dimensional PDP simulator and applied it to a T-shaped electrode cell in order to show the effects of sustain electrode shape that cannot be included in two-dimensional simulation. The dependence of power consumption on electrode shape and area in the simulation showed the same trend as experiment.

Electric field distribution and discharge characteristics in accordance with various ITO electrode structures in AC-PDP

  • Cho, Seok-H.;Oh, P.Y.;Kim, J.H.;Hong, Y.J.;Kwon, G.C.;Cho, G.S.;Choi, E.H.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2008.10a
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    • pp.396-399
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    • 2008
  • In this study, the electric field distributions have been investigated by simulation in accordance with the various shapes of ITO-electrodes. Also we have measured the density of excited Xe atoms in the 1s5 state in discharge cell, where the gap distance of 60 um, gas pressure of 400 Torr, Xe contents of 7%, and sustaining voltage of 200 V are kept in this experiment. The maximum density of excited Xe atoms in the 1s5 state in a discharge cell for the fish-boned, T shaped and squared ITO electrodes have been measured to be $3.01\;{\times}\;10^{13}\;cm^{-3}$, $2.66\;{\times}\;10^{13}\;cm^{-3}$ and $2.06\;{\times}\;10^{13}\;cm^{-3}$, respectively. It is shown that the electric field distribution with different ITO Electrodes is essential factor for these maximum density of excited Xe atoms in discharge cell.

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Perceived Anxiety and Uncertainty in Hematopoietic Stem Cell Transplantation Recipients to and from Isolation Unit (격리병동 입.퇴실시 조혈모세포 이식 환자가 지각하는 불안과 불확실성)

  • Kim, Hye-Jo;Choi, Dong-Won;Park, Ho-Ran;Sohng, Kyeong-Yae
    • Journal of Korean Academy of Fundamentals of Nursing
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    • v.13 no.3
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    • pp.428-436
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    • 2006
  • Purpose: To investigate the levels of uncertainty and anxiety at admission and discharge to the isolation unit for patients undergoing hematopoietic stem cell transplantation (HSCT). Method: The data were collected from 60 patients who were admitted to the department of HSCT. Uncertainty and anxiety were assessed using the Mishel Uncertainty in Illness Scale (MUIS) and Anxiety Inventory (STAI). Collected data were analyzed using the SAS program. Results: The mean score for anxiety at admission was 2.20, and at discharge 2.10. The mean score for uncertainty at admission was 2.19, and at discharge 2.07. The anxiety at admission the group with physical discomfort was higher than that of group without physical discomfort. A positive relationship was found between anxiety and uncertainty at admission and at discharge. The major variables were expectation for cure and physical discomfort, explaining 25.87% of the anxiety at admission. The major variable was expectation for cure, explaining 20.94% of the uncertainty at admission. Conclusion: Front the above results, it can be concluded that support and consideration are required to reduce anxiety of the inpatient in single room.

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Effect Of Substituted-Fe for the Charge-discharge behavior Of $LiMn_{2}O_{4}$cathode materials (Fe 치환이$LiMn_{2}O_{4}$정극 활물질의 충방전 특성에 미치는 영향)

  • 정인성;김민성;구할본;손명모;이헌수
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.07a
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    • pp.548-551
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    • 2000
  • Spinel phase LiF $e_{y}$M $n_{2-y}$ $O_4$samples are synthesized by calcining a LiOH.$H_2O$, Mn $O_2$and F $e_2$ $O_3$mixture at 80$0^{\circ}C$ for 36h in air. Preparing LiF $e_{y}$M $n_{2-y}$ $O_4$showed spinel phase with cubic phase. The ununiform distortion of the crystallite of the spinel LiF $e_{y}$M $n_{2-y}$ $O_4$was more stable than that of the pure. The discharge capacity of the cathode for the Li/LiF $e_{0.1}$M $n_{1.9}$ $O_4$cell at the first than that of the pure. The discharge capacity of the cathode for the Li/LiF $e_{0.1}$M $n_{1.9}$ $O_4$cell at the first cycle and at the 70th cycle was about 113 and 90mAh/g, respectively. This cell capacity was retained about 82% of the first cycle after 70th cycle. Impedance profile of this cell was more stable than that pure. The resistance, the capacitance and chemical diffusion coefficients of lithium ion showed approximately 80$\Omega$, 36133.87$\mu$F ; 1.4$\times$10$^{-8}$ c $m^2$ $s^{-1}$ , respectively. , respectively.ely.

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3-Dimensional Emission characteristics of an AC PDP Cell

  • Jung, Jae-Chul;Jeong, Dong-Cheol;Bae, Hyun-Sook;Whang, Ki-Woong
    • 한국정보디스플레이학회:학술대회논문집
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    • 2004.08a
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    • pp.529-532
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    • 2004
  • The spatio-temporal variation of Infra Red(IR) emission images were obtained from a real 3-dimensional discharge space of a surface discharge type, alternating current plasma display panel(AC PDP) cell with the Ne-Xe(4%) 400Torr gas mixture. IR emissions were observed in each period of the ADS(Address and Display Separation) driving scheme with ramp initializing waveform using an images intensified charge coupled device(ICCD) camera. The roles of each electrode were identified and it was compared with the results of the discharge simulation and of the wall charge distributions measured by the electro-optic technique.

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Charge/discharge Properties of $LiMn_2O_4$ Composite Cathode for All-solid state Rechargeable Batteris (리튬 고체전지용 $LiMn_2O_4$ Composite Cathode의 충방전 특성)

  • Kim, Jong-Uk;Park, Gye-Choon;Gu, Hal-Bon
    • Proceedings of the KIEE Conference
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    • 1998.07d
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    • pp.1511-1513
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    • 1998
  • The purpose of this study is to research and develop PEO/PVDF electrolytes and $LiMn_2O_4$ composite cathode for all-solid state lithium rechargeable battery. We investigated AC impedance response and charge/discharge cycling of $LiMn_2O_4$/SPE/Li cells. The cell resistance was decreased so much initial charge process from 0% SOC to 100% SOC. The radius of semicircle of $LiMn_2O_4$/SPE/Li cell was so much from initial state to 20th cycling. The discharge capacity of the $LiMn_2O_4$ composite cathode was 144mAh/g based on $LiMn_2O_4$.

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