• Title/Summary/Keyword: Potential barrier

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Influence of Flash-over Voltage on Conductive Particle-Initiated and Solid Dielectric Barrier (고체유전체의 장벽과 도전성 파티클이 섬락전압에 미치는 영향)

  • 이용길;김동의;이세헌;김재호;김정달
    • The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.8 no.3
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    • pp.54-63
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    • 1994
  • In this paper, we fixed to the needle electrode on the plate spacer fabricated the plate electrode of the gap interval 40[mm]and divided into the interval lO[mm]in the gap. When set up the particle and barrier on the material as well as spacer in the each intervaL We investigated that FOV and discharge path to AC, OC positive polarity. The results are as follow. 1) When the barrier is settled on the high potential side and the particle is hidden on the back of barrier, FaV has been increased. 2) When the particle is located on the tip of needle electrode, FaV has been decreased considembly. 3) When the particle is between electrodes. FaV has been decreased because discharge path through the particle.

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The Effects of Baekho-tang Extracts on Regulating Th2 Differentiation through Improving Skin Fat Barrier Damage (백호탕 추출물의 지방장벽 손상 개선을 통한 상피 내 Th2 분화 조절 효과)

  • Ahn, Sang Hyun;Kim, Ki Bong;Jeong, Aram
    • The Journal of Pediatrics of Korean Medicine
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    • v.35 no.4
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    • pp.156-166
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    • 2021
  • Objectives The purpose of this study is to confirm the regulate effect of T helper (Th) 2 differentiation that Baekho-tang extract may produce to improves skin lipid barrier damages. Methods Four-weeks-old NC/Nga mice were divided into four groups: control group (Ctrl, n=10), lipid barrier eliminated group (LBE, n=10), Dexamethasone treatment after lipid barrier elimination group (DxT, n=10), and Baekho-tang extract treatment group after lipid barrier elimination group (BHTT, n=10). Baeko-tang extract was administered for 3 days after removal of the skin fat barrier in BHTT group. Then, we identified changes in external symptoms of the skin, factors affecting skin barrier such as potential of hydrogen (pH), filaggrin (FLG), transepidermal water loss (TEWL) and Th2 differentiation factors like Interleukin (IL)-4, Kallikrein Related Peptidase 7 (KLK7) and protease activated receptor 2 (PAR-2) through our immunohistochemistry. Results After lipid barrier elimination, the reduction of morphological skin inflammations was less in BHTT group than in LBE group and DxT group. Also, pH and TEWL were significantly decreased with BHTT group. However, FLG was significantly increased in BHTT group compared to LBE, DxT, and Ctrl group. All kinds of Th2 differentiation factors (IL-4, KLK7 and PAR-2) were also decreased in BHTT compared to the LBE and DxT. Conclusions As a result of this study, BHT administration decreased pH, TEWL, and increased FLG, thus participating in recovering damaged skin barrier. Since Th2 differentiation factors were decreased as well, BHT's regulatory effect in sequential immune reactions may be a possible explanation of how it enhances recovery of the damaged lipid barrier.

Electrochemical Random Signal Analysis during Localized Corrosion of Anodized 1100 Aluminum Alloy in Chloride Environments

  • Sakairi, M.;Shimoyama, Y.;Nagasawa, D.
    • Corrosion Science and Technology
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    • v.7 no.3
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    • pp.168-172
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    • 2008
  • A new type of electrochemical random signal (electrochemical noise) analysis technique was applied to localized corrosion of anodic oxide film formed 1100 aluminum alloy in $0.5kmol/m^3$ $H_3BO_4/0.05kmol/m^3$ $Na_2B_4O_7$ with $0.01kmol/m^3$ NaCl. The effect of anodic oxide film structure, barrier type, porous type, and composite type on galvanic corrosion resistance was also examined. Before localized corrosion started, incubation period for pitting corrosion, both current and potential slightly change as initial value with time. The incubation period of porous type anodic oxide specimens are longer than that of barrier type anodic oxide specimens. While pitting corrosion, the current and potential were changed with fluctuations and the potential and the current fluctuations show a good correlation. The records of the current and potential were processed by calculating the power spectrum density (PSD) by the Fast Fourier Transform (FFT) method. The potential and current PSD decrease with increasing frequency, and the slopes are steeper than or equal to minus one (-1). This technique allows observation of electrochemical impedance changes during localized corrosion.

A 2-D Model for the Potential Distribution and Threshold Voltage of Fully Depleted Short-Channel Ion-Implanted Silicon MESFET's

  • Jit, S.;Morarka, Saurabh;Mishra, Saurabh
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.5 no.3
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    • pp.173-181
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    • 2005
  • A new two dimensional (2-D) model for the potential distribution of fully depleted short-channel ion-implanted silicon MESFET's has been presented in this paper. The solution of the 2-D Poisson's equation has been considered as the superposition of the solutions of 1-D Poisson's equation in the lateral direction and the 2-D homogeneous Laplace equation with suitable boundary conditions. The minimum bottom potential at the interface of the depletion region due to the metal-semiconductor junction at the Schottky gate and depletion region due to the substrate-channel junction has been used to investigate the drain-induced barrier lowering (DIBL) and its effects on the threshold voltage of the device. Numerical results have been presented for the potential distribution and threshold voltage for different parameters such as the channel length, drain-source voltage, and implanted-dose and silicon film thickness.

Th2 Differentiation Control through Formation of Skin Fat Barrier of Sabaek-san extract (사백산 추출물의 지방장벽 생성을 통한 Th2 분화 조절)

  • Ahn, Sang Hyun;Jeong, A Ram;Kim, Ki Bong
    • The Journal of Pediatrics of Korean Medicine
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    • v.36 no.1
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    • pp.57-64
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    • 2022
  • Objectives The purpose of this study is to confirm the regulate effect of T helper (Th) 2 differentiation that Sabaek-san extract may produce to improves skin lipid barrier damage. Methods Four-weeks-old NC/Nga mice were divided into four groups: control group (Ctrl, n=10), lipid barrier eliminated group (LBE, n=10), Dexamethasone treatment after lipid barrier elimination group (DXT, n=10), and Sabaek-san extract treatment group after lipid barrier elimination (SBT, n=10). Sabaek-san extract was administered for 3 d after removal of the skin fat barrier in SBT group. Then, we identified changes in external symptoms of the skin, factors affecting skin barrier such as potential of hydrogen (pH), filaggrin, transepidermal water loss (TEWL) and Th2 differentiation factors like Interleukin (IL)-4, Kallikrein Related Peptidase 7 (KLK7), and protease activated receptor 2 (PAR-2) through our immunohistochemistry. Results After lipid barrier elimination, the reduction of morphological skin inflammations was less in SBT group than in LBE and DXT group. Also, pH and TEWL were significantly decreased with SBT group. However, filaggrin was significantly increased in SBT group compared to LBE, DXT, and Ctrl group. All kinds of Th2 differentiation factors (IL-4, KLK7 and PAR-2) were also decreased in SBT compared to the LBE and DXT. Conclusions As a result of this study, SBT administration decreased pH, TEWL, and increased filaggrin, thus participating in recovering damaged skin barrier. Since Th2 differentiation factors were decreased as well, SBT's regulatory effect in sequential immune reactions may be a possible explanation of how it enhances recovery of the damaged lipid barrier.

A Basic Study on Review the Classification System and the Process of BlM Information for an Automatic Review of Certification Method of Health and Barrier Free Environment (장애물 없는 생활환경 인증제도의 자동검토를 위한 BIM 모델링 정보 및 인증 항목 정보의 분류체계 분석 프로세스에 관한 기초 연구)

  • Hong, Sa-Chul;Kim, Suk-Tae
    • Korean Institute of Interior Design Journal
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    • v.27 no.2
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    • pp.154-165
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    • 2018
  • For the foundational study on automatic review of the barrier free Environment certification for the socially disadvantaged using BIM modeling information, we first confirm the need of the automatic review by analyzing the barrier free Environment certification an by investigating the existing studies on barrier free Environment certification. After that, we select a primary approach for our research by investigating the related works such as automatic review of the building code. As a next step, we generate the BIM modeling information, extract the classification system, analyze and extract items in the barrier free Environment certification according the extracted system, compares the items with the BIM generation information, and allocate them. And, we showed the potential usability of automatic review by deriving a process to prepare the ruleset structure for the automatic review and to prepare a criteria for BIM modeling guide.

Computer Simulation of Pt-GaAs Schottky Barrier Diode (Pt-GaAs Schottky Barrier Diode의 Computer Simulation)

  • Yoon, Hyun-Ro;Hong, Bong-Sik
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.27 no.3
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    • pp.101-107
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    • 1990
  • In this work, one-dimensional simulation is carried out for PT-GaAs Schottky barrier diodes with finite difference method. Shockley's semiconductor governing equations: Poisson equation and current continuity equation are discertized, and linearized by Newton-Raphson method. The linear system of equation is solved by Gaussian elimination method until convergence is achieved. The boundary condition for this equation is taken from thermionic emission-diffusion theory. Simulation is done for PT-GaAs epitaxial-layer Schottky barrier diodes. The claculated results of electron and potential distribution are shown. Simulation results show exellent agreement with experiments.

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Optimization of Designing Barrier to Mitigate Hazardous Area in Hydrogen Refueling Stations (수소충전소 폭발위험장소 완화를 위한 확산차단벽 최적화 설계)

  • SEUNGHYO AN;SEHYEON OH;EUNHEE KIM;JUNSEO LEE;BYUNGCHOL MA
    • Transactions of the Korean hydrogen and new energy society
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    • v.34 no.6
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    • pp.734-740
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    • 2023
  • Hydrogen emphasis on safety management due to its high potential for accidents from wide explosive limits and low ignition energy. To prevent accidents, appropriate explosion-proof electrical equipment with installed to safe management of ignition sources. However, designing all facilities with explosion-proof structures can significantly increase costs and impose limitations. In this study, we optimize the barrier to effectively control the initial momentum in case of hydrogen release and form the control room as a non-hazardous area. We employed response surface method (RSM), the barrier distance, width and height of the barrier were set as variables. The Box-Behnken design method the selection of 15 cases, and FLACS assessed the presence of hazardous area. Analysis of variance (ANOVA) analysis resulting in an optimized barrier area. Through this methodology, the workplace can optimize the barrier according to the actual workplace conditions and classify reasonable hazardous area, which is believed to secure safety in hydrogen facilities and minimize economic burden.

Effect of Sabaek-san Extract on Skin Damage Recovery in Atopic Dermatitis-induced Mice (사백산추출물의 아토피피부염 유발 백서에서의 피부장벽 손상 회복 효과)

  • Ahn Sang Hyun;Kim Ki Bong
    • The Journal of Pediatrics of Korean Medicine
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    • v.37 no.4
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    • pp.25-33
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    • 2023
  • Objective This study aimed to confirm the effect of Sabaek-san extract on the recovery of skin damage in atopic dermatitis-induced mice. Methods In this study, we used 4-week-old NC/Nga mice that were assigned to four groups: control (Ctrl), lipid barrier elimination (LBEG), dexamethasone (Dx) administration after lipid barrier elimination (DxAG), and Sabaek-san extract administration after lipid barrier elimination (SBAG). Ten rats were assigned to each treatment group. After drug administration for 3 days following lipid barrier elimination, ceramide kinase, caspase 14, sodium hydrogen antiporter (NHE), cathelicidin, claudin, and Toll-like receptor (TLR2) were observed to confirm restoration of skin moisturizer production, antimicrobial barriers, and tight junctions in the skin barrier. Results Ceramide kinase and caspase 14 positive reactions were significantly higher in the SBAG group than in the LBEG or DxAG groups. NHE and cathelicidin showed a higher positive reaction in the SBAG group than in the LBEG and DxAG groups. Claudins and TLR2 showed a higher positive reaction in the SBAG group than in the LBEG or DxAG groups. Conclusion It was confirmed that Sabaek-san extract may have the potential to restore damaged skin barrier in atopic dermatitis.

Effect of Galgeunhwanggeumhwangryeon-tang Extract on Skin Moisturizing, Antibacterial, and Tight Juntion Recovery in Atopic Dermatitis-induced Mice (갈근황금황련탕추출물의 아토피피부염 유발 백서에서의 피부 보습, 항균, 밀착연접 회복)

  • Ahn Sang Hyun;Jeong A Ram;Kim Ki Bong
    • The Journal of Pediatrics of Korean Medicine
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    • v.38 no.1
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    • pp.1-9
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    • 2024
  • Objective The purpose of this study was to confirm the effects of Galgeunhwanggeumhwangryeon-tang (PSCG) extract on skin moisturizing, antibacterial, and tight junction recovery in atopic dermatitis-induced mice. Methods In this study, we used 4-week-old NC/Nga mice divided into four groups: control (Ctrl), lipid barrier elimination (LBE), dexamethasone (Dx) after lipid barrier elimination (DEX), and PSCG after lipid barrier elimination (PSC). Ten rats were assigned to each treatment group. Three days after drug administration following lipid barrier elimination, ceramide kinase, caspase 14, sodium hydrogen antiporter (NHE), cathelicidin, claudin, and toll-like receptor (TLR)-2 were observed to confirm the restoration of skin moisturizer production, antimicrobial barriers, and tight junctions in the skin barrier. Results Ceramide kinase and caspase 14 positive reaction were significantly higher in PSC than in LBE and DEX. Both NHE and cathelicidin showed higher positive reactions in PSC than in LBE and DEX. Claudin, and TLR-2 showed higher levels of positive staining in the PSC group than in the LBE and DEX groups. Conclusion It was confirmed that the PSCG extract can have the potential to restore the damaged skin barrier in atopic dermatitis.