• Title/Summary/Keyword: Electrical conductance

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A study on the impedance effect of nonvolatile memory devices (비휘발성 기억소자의 저항효과에 관한 연구)

  • 강창수
    • Electrical & Electronic Materials
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    • v.8 no.5
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    • pp.626-632
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    • 1995
  • In this paper, The effect of the impedances in SNOSFET's memory devices has been developed. The effect of source and drain impedances measured by means of two bias resistances - field effect bias resistance by inner region, external bias resistance. The effect of the impedances by source and drain resistance shows the dependence of the function of voltages applied to the gate. It shows the differences of change in source drain voltage by means of low conductance state and high conductance state. It shows the delay of threshold voltages. The delay time of low conductance state and high conductance state by the impedances effect shows 3[.mu.sec] and 1[.mu.sec] respectively.

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Study on the Interface State Density of MNS Diode by the Conductance Method. (Conductance 법에 의한 MNS Diode 의 계면상태에 관한 고찰)

  • Sung, Yung-Kwon;Choi, Jong-Il;Lee, Nae-In
    • Proceedings of the KIEE Conference
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    • 1988.07a
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    • pp.346-349
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    • 1988
  • Conductance technique is the moat accurate method and gives more detailed information about interface of the MIS structure than other methods. With the measurement of the equivalent parallel conductance and capacitance, the characterization of Si-SiN interface is developed. The interface state density of Si-SiN is obtained by $8{\times}10^{11}$ - $6{\times}10^{12}(eV^{-1}cm^{-2}$). After the positive B-T stress is performed on the sample, the interface state density gets increased. The interface state density is not effected by the D.C. stress.

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AN IMPROVED ELECTRICAL-CONDUCTANCE SENSOR FOR VOID-FRACTION MEASUREMENT IN A HORIZONTAL PIPE

  • KO, MIN SEOK;LEE, BO AN;WON, WOO YOUN;LEE, YEON GUN;JERNG, DONG WOOK;KIM, SIN
    • Nuclear Engineering and Technology
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    • v.47 no.7
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    • pp.804-813
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    • 2015
  • The electrical-impedance method has been widely used for void-fraction measurement in two-phase flow due to its many favorable features. In the impedance method, the response characteristics of the electrical signal heavily depend upon flow pattern, as well as phasic volume. Thus, information on the flow pattern should be given for reliable void-fraction measurement. This study proposes an improved electrical-conductance sensor composed of a three-electrode set of adjacent and opposite electrodes. In the proposed sensor, conductance readings are directly converted into the flow pattern through a specified criterion and are consecutively used to estimate the corresponding void fraction. Since the flow pattern and the void fraction are evaluated by reading conductance measurements, complexity of data processing can be significantly reduced and real-time information provided. Before actual applications, several numerical calculations are performed to optimize electrode and insulator sizes, and optimal design is verified by static experiments. Finally, the proposed sensor is applied for air-water two-phase flow in a horizontal loop with a 40-mm inner diameter and a 5-m length, and its measurement results are compared with those of a wire-mesh sensor.

A Study on Arc Conductance of Puffer Type SF6 GCB at Current Zero Period (전류영점 영역에서 파퍼식 SF6 가스차단기의 아크 컨덕턴스에 관한 연구)

  • Chong, Jin-Kyo;Song, Ki-Dong;Lee, Woo-Young;Kim, Gyu-Tak
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.2
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    • pp.328-332
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    • 2010
  • The SLF(Short Line Fault) breaking capability test for high voltage class $SF_6$ GCB(Gas Circuit Breaker) was conducted. Simplified LC resonant circuit test facility was used for SLF breaking test. During test, Test current was measured by Rogwski coil and arc voltage was measured by voltage divider. Arc conductance was calculated by using these test results before 200ns at current zero. Critical arc conductance value at rated voltage 145kV class is about 2.3mS regardless of breaking current magnitude and arc conductance value at rated voltage 170kV class is about 2.6mS.

Effects of NiO Addition in $WO_3$-based Gas Sensors Prepared by Thick film Process (후막법으로 제조된 $WO_3$ 기체센서의 NiO 첨가효과)

  • Noh, Whyo-Sub;Bae, In-Soo;Chung, Hoon-Taek;Lee, Woo-Sun;Hong, Kwang-Joon;Lee, Hyun-Kyu;Park, Jin-Seong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.05b
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    • pp.61-66
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    • 2001
  • NiO-doped $WO_3$ thick films were prepared by a screen printing technique. The electrical property and microstructure of the films were investigated with the partial pressure of oxygen and the amount of NiO. The grain size of NiO-doped $WO_3$ was smaller than that of undoped $WO_3$, but the grain size of 0.1, 1, 10 mol% NiO-doped $WO_3$ were nearly the same. The electrical conductance of the $WO_3$ thick films decreased with the oxygen partial pressure, and increased with the amount of NiO to the limit of solid solution. The variation of the electrical conductance with temperature is not so large in the extrinsic region, but it changed rapidly in the intrinsic region. The conductance decreased with adsorption of oxygen in the intermediate range between the extrinsic and intrinsic region.

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Simulation of Conductance Effects on Vacuum Characteristics of High Vacuum System for Semiconductor Processing (반도체공정 고진공시스템 진공특성에 대한 배기도관 컨덕턴스 영향 전산모사)

  • Kim, Hyung-Taek;Seo, Man-Jae
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.23 no.4
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    • pp.287-292
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    • 2010
  • Effect of conductance factors on performance of vacuum system was simulated for optimum design of vacuum system. In this investigation, the feasibility of modeling mechanism for VacSim$^{Multi}$ simulator was proposed. Application specific design of vacuum system is required to meet the particular process conditions for various industrial implementations of vacuum equipments. Geometry and length, diameter of exhaust pipeline were modeled as simulation modeling variables for conductance effects. Series vacuum system was modeled and simulated with varied dimensions and structures of exhaust pipeline. Variation of pipeline diameter showed the more significant effects on vacuum characteristics than that of pipeline length variations. It was also observed that the aperture structure of pipeline had the superior vacuum characteristics among the modeled systems.

The Study on the Interface State Density of $N_{2}Plasma$ Treated Oxide by the Conductance Technique (Conductance 법에 의한 $N_{2}Plasma$ 처리한 산화막의 계면상태 밀도에 관한 연구)

  • Sung, Yung-Kwon;Lee, Nae-In;Rhie, Seung-Hwan
    • Proceedings of the KIEE Conference
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    • 1988.11a
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    • pp.189-192
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    • 1988
  • Nitrided oxides have been investigated recently for application as a replacement for thermally grown $SiO_2$ in MIS devices. In this paper, thin oxides were nitrided in $N_2$ Plasma ambient. With the measurement of the equivalent paralled conductance and capacitance by the using coductance technique, the characterization of Si-SiON interface is developed. The interface state density of Si-SiON is obtained by $1{\times}10^{11}{\sim}9{\times}10^{11}(eV^{-1}Cm^{-2})$. After${\pm}$B-T stress is performed on the sample, the interface state density gets increased.

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A New MPPT Scheme Based on Variable Step Size Incremental Conductance Method for PV Distributed Generation (태양광 발전시스템을 위한 새로운 가변폭 변조방식의 최대전력점 추종기법)

  • Ko, Eun-Gi;Kim, Jin-Ho;Park, Jun-Yeol;Lee, Dong-Myung
    • Proceedings of the KIPE Conference
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    • 2010.07a
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    • pp.565-567
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    • 2010
  • This paper proposes a new Maximum Power Point Tracking (MPPT) control algorithm for PV-Cell (Photo voltaic) based on Incremental Conductance MPPT algorithm. The ICN (Incremental Conductance method) algorithm is widely used due to the high tracking accuracy and adaptability to the rapidly changing isolation condition. In this paper, a modified ICN MPPT algorithm is proposed. This method adjusts automatically the step-size of reference to track the PV-Cell maximum power point, thus it improves the maximum power point tracking speed and accuracy.

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Input conductance of neuron for Hopfield Neural Networks (Hopfield 신경회로망에서 뉴론의 입력단 컨덕턴스)

  • Kang, Min-Je
    • Journal of IKEEE
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    • v.4 no.2 s.7
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    • pp.192-201
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    • 2000
  • This paper discusses the influence of the input conductance on system stability for the continuous type Hopfield Neural Networks.. The input conductance is connected from the neuron input to ground. The input conductance has been proved to effect on stability in input space. Transient analysis is used to test the stability in input space. Also, it has been studied how to adjust the input conductance for improving the system's performance.

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The Acoustic Output Estimation for Therapeutic Ultrasound Equipment using Electro-Acoustic Radiation Conductance (전기-음향 방사컨덕턴스를 이용한 치료용 초음파 자극기의 음향출력 예측)

  • Yun, Yong-Hyeon;Jho, Moon-Jae;Kim, Yong-Tae;Lee, Myoung-Ho
    • Journal of Biomedical Engineering Research
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    • v.32 no.3
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    • pp.264-269
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    • 2011
  • To increase therapeutic efficiency and biological safety, it is important to precision control of acoustic output for therapeutic ultrasound equipment. In this paper, the electro-acoustic radiation conductance, one of electroacoustic characteristics of therapeutic ultrasound equipment, was measured by the radiation force balance method according to IEC 61161 standards and the acoustic output was estimated using the electro-acoustic radiation conductance. The estimation of acoustic output was conducted to continuous wave mode and pulse wave mode of duty cycle between 20% and 80%. The differences between prediction values and measurement results are within 5% of measurement uncertainty, which is a reasonably good agreement. The results show that acoustic output controlled by electro-acoustic radiation conductance was found to be an effective method.