• Title/Summary/Keyword: Dual electrode

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Measurement of Soot Nano-Particle Using LIIM(Laser-Induced Ion Mobility) (LIIM(Laser-Induced Ion Mobility) 계측을 이용한 매연 나노입자 측정)

  • Lee, Eui-Ju
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.28 no.9
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    • pp.1110-1116
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    • 2004
  • Experimental measurements of laser-induced ion mobility(LIIM) were performed for ethene/air premixed flames operated near the soot inception point. Soot was ionized using a pulsed laser operated at 532 nm. The ionization signal was collected with a tungsten electrode located in the post-flame region. ionization signals were collected using both a single electrode and dual electrode configuration. Prior LIIM studies have focused on the use of a single biased electrode to generate the electric field, with the burner head serving as the path to ground. In many practical combustion systems, a path to ground is not readily available. To apply the LIIM diagnostic to these geometries, a dual electrode geometry must be employed. The influence of electrode configuration, flame equivalence ratio, and flame height on ionization signal detection was determined. The efficacy of the LIIM diagnostic to detect soot inception in the post-flame region of a premixed flame using a dual electrode configuration was investigated. For the different dual electrode configurations tested, the dual parallel electrode geometry was observed to be most sensitive to detect the soot inception point in a premixed flame.

Improvement of Direct-Modulation Performances of Semiconductor Lasers by using Dual-Electrode Structure (이중 전극 구조를 이용한 반도체 레이저의 직접 변조 성능 향상)

  • Sung, Hyuk-Kee
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.15 no.3
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    • pp.654-659
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    • 2011
  • We propose a novel method to reduce laser chirp and improve modulation performance in semiconductor laser by using dual-electrode structure. Dual-electrode structure is realized by segmenting a electrode on top of gain medium, as was the case of edge emitting laser diode, into electrically isolated two electrodes. By using the proposed structure, we have experimentally achieved a reduction of laser spectral width of 0.23 nm and an improvement of 2.5-dB receiver sensitivity at an 80-km fiber transmission for 10-Gbps NRZ (non-return-to zero) data stream.

Narrowband Modulation Response Enhancement Using a Dual-Electrode Distributed Feedback Laser Integrated With an Electro-Absorption Modulator (전계 흡수 변조기가 집적된 다중 전극 분포 궤환형 레이저를 이용한 광신호의 협대역 변조 응답 향상)

  • Cho, Jun-Hyung;Heo, Seo-Weon;Sung, Hyuk-Kee
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.17 no.8
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    • pp.1968-1973
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    • 2013
  • We present the enhancement of narrowband modulation response of an optical source by integrating a dual-electrode distributed feedback (DFB) laser with an electro-absorption modulator (EAM). The dual-electrode DFB laser exhibits a multiple optical modes owing to a self-pulsation in GHz range. By modulating the laser and modulator sections of the integrated device simultaneously, 20-dB of narrowband modulation response enhancement at 6 GHz with 7-GHz tuning range has been observed.

Study of Pulse Generation Technique for Serial dual Electrode Detection of Amino Acids and Proteins in Flow Injection Analysis

  • Fung, Ying-Sing;Mo, Song-Ying
    • Analytical Science and Technology
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    • v.8 no.4
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    • pp.575-582
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    • 1995
  • A new analytical procedure using a serial dual electrode detector was developed for the analysis of amino acids and proteins. Bromine was generated at the upstream electrode and detected by the downstream electrode. The presence of amino acids and proteins was shown to lower the downstream current but with no apparent effect on the upstream current. This indirect mode of detection can be applied to the determination of amino acids and proteins which are electrochemically inactive or too large to be accessible to the electrode surface for electron exchange. The method is shown capable to determine various amino acids (cystine, tyrosine, lysine, tryptophan, glycine, methionine and arginine) and proteins (cytochrome c, hemoglobin, HAS, a-Amylase, Conalbumin I, Catalase and Myglobin) with linear working range for amino acids between $10^{-6}$ to $10^{-3}M$ and total proteins between $10^{-7}$ to $10^{-3}M$. The method has been applied for the analysis of amino acids and total protein in food using Flow Injection Analysis with results obtained comparable to those using the traditional analytical procedure. Use of pulse generation technique was shown to produce a more stable flow injection analysis peaks for repetitive determination than the use of conventional constant current method which showed increase of the background current after determination over 200 minutes. The pulse method was found to give stable baseline even after 400 minutes. Thus, the method is shown able to provide a suitable analytical procedure for automatic analysis of amino acids and proteins in food by flow injection analysis.

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Detection of 10-GHz Optical Single-/Double-Sideband Labels Using Fiber-Optic Interleavers (광섬유 인터리버를 이용한 10-GHz 광 단측파대/양측파대 레이블 검출)

  • Park, Kyoung-Deuk;Shin, Jong-Dug;Kim, Boo-Gyoun
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.32 no.7C
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    • pp.652-657
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    • 2007
  • Optical subcarrier-multiplexed (OSCM) labels in optical label switching networks have been detected using interleavers composed of fiber-optic Mach-Zehnder interferometer. 10-GHz optical single-/double-sideband signals generated from dual-electrode Mach-Zehnder intensity modulator have been used as the OSCM labels. In the case of single-sideband signals, the upper-sideband was observed to be suppressed about 16.8 dB compared with the lower-sideband from the optical spectrum measured at the label extraction output. For the case of double-sideband signals, both sidebands appeared with small insertion loss at the interleaver output. Since we used the phase-shift method to generate single-sideband signals, the power level of the single-sideband was higher by 3 dB than that of the double-sidebands.

New Address Electrode Suitable for Fast Addressing with High Xe ac-PDP

  • Lee, Don-Kyu;Lee, Ho-Jun;Lee, Hae-June;Kim, Dong-Hyun;Park, Chung-Hoo
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.564-567
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    • 2004
  • New address electrode having separated dual electrode is suggested to reduce addressing time in ac PDP. Addressing characteristics of suggested electrode has been investigated in the test panel with high Xe partial pressure. It has been found that both the formative and jitter width of the suggested electrode is improved by 10 -20 % over the wide range of address voltage level compared with the conventional one. The dynamic margin of the panel also greatly improved. The key feature behind this type of structure is that it can extend the controllability of the wall charge distribution during the reset and address discharge without significant increase in capacitive load of address electrode.

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Characterization of the High Luminance Top Emission Organic Light-emitting Devices (TEOLEDs) Using Dual Cathode Layer (이중 음극층을 이용한 고휘도 전면발광(Top emission) 유기EL소자의 특성평가)

  • Kang, Yoon-Ho;Lee, Su-Hwan;Shin, Dong-Won;Kim, Sung-Jun;Kim, Dal-Ho;Lee, Gon-Sub;Park, Jea-Gun
    • Journal of the Semiconductor & Display Technology
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    • v.5 no.3
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    • pp.23-27
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    • 2006
  • Recently, Top emission organic light-emitting diode (TEOLED) has been attracted by their potential application for the development of flat panel display (FPD). We have fabricated the high luminance top emission organic-emitting diode (TEOLED) using dual cathode layer and three top emitting structure. These devices were characterized by electroluminescence (EL) and current density-voltage (J-V) measurements. After compared it with Au anode structure, luminance of the device using dual anode was better than using without Al device. Consequently, Al layers are very good candidates for a promising electron-injecting buffer layer for top emission light-emitting diode (TEOLED).

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Electromyography Analysis of Muscle Activities of tower limb for Crouching Start Technique (Electromyography 기법을 이용한 육상 크라우칭 스타트의 하체 근 동원 비교분석)

  • Shin, Sung-Hyu;Park, Ki-Ja
    • Korean Journal of Sport Biomechanics
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    • v.13 no.2
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    • pp.115-122
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    • 2003
  • The purposes of this study were to analyze the muscle activities and the characteristics of muscle recruting patterns of lower limb for crouching start technique using four elite splint. The EMG technique was used to record muscle activities of both right and left sides of retus femoris, vastus medialis, biceps femoris, and gastrocnemius. Eight surface electrodes were placed on the surface of the selected muscles and one ground electrode was also attached on the back of neck(C7). One video camera was also used to record the crouching start motion to define 6 events and 5 phases for further analysis. The raw EMG data were filtered with band pass filter(10-350) to remove artifacts and then low pass filtered(4Hz) to find the linear envelope which resemble muscle tension curve. This filter EMG data were normalized to MVIC for the purpose of comparison between right and left sides muscle. The results of this study were as follows. All four subjects showed that vastus medialis muscle activity was comparatively higher than those of retus femoris, biceps femoris, gastrocnemius. And left side of muscle activity was comparatively higher than right side of muscle activity. Therefore, when the subjects starting out crouching start position, we recognized that the muscle of lower limb showed interaction effect by each muscle.

A Study on Graphite Electrode Wear in Sink EDM of HP1MA Steel (HP1MA 강의 형조 방전가공에서 흑연 전극 마모에 관한 연구)

  • Oh, Young-Jin;Jeong, Hyeon-Je;Kim, Su-Jin
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.19 no.8
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    • pp.35-42
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    • 2020
  • In discharge machining, material is removed by electrical discharge between the electrode and the workpiece. An important consideration in EDM is that the wear of the electrodes decreases the final precision of the workpiece. The edge wear of the electrodes proceeds very quickly because sparks occur more frequently at the edges with high local electrical strength. In this study, mold steel was discharged with a wedge-shaped graphite electrode to measure the edge wear of the electrode according to the depth. The electrode edge wear increased with depth during EDM and a wear model was developed. The model predicted that the edge wear can be reduced by approximately 70% using two electrodes instead of a single electrode. The model was supported by the experimental comparison of the dual electrode method and the single electrode method.