• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2003년도 추계학술대회논문집
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• pp.970-976
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• 2003

In this paper, we analyse and present electro-mechanical dynamic characteristics of a micro-machined vibrating silicon ring gyroscope which can measure angular velocities about three orthogonal axes. The ring gyroscope has a ring connected to the gyroscope main body by support-ligaments which are arranged with cyclic symmetry. The natural modes of its vibration can be distinguished into the in-plane motion and the out-of-plane motion which are coupled by the gyro-effect due to the notation of the gyroscope main body. The motions of the ring are electro-statically derived, sensed and balanced by electrodes. The equations of motion are formulated. The scheme of angular velocities sensing by force-to-rebalance method is presented. The dynamic characteristics of a ring gyroscope are calculated and compared.

• 한국응용과학기술학회지
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• 제26권4호
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• pp.400-406
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• 2009

We investigated the electrochemical properties for Langmuir-Blodgett (LB) films of functionalized polyimide. LB films of polyimide monolayer were deposited by the Langmuir-Blodgett method on the indium tin oxide(ITO) glass. The electrochemical properties measured by cyclic voltammetry with a three-electrode system(an Ag/AgCl reference electrode, a platinum wire counter electrode and LB film-coated ITO working electrode) at various concentrations(0.5, 1.0, and 1.5 N) of $NaClO_4$ solution. The current of reduction and oxidation range was measured from 1650 mV to -1350 mV, continuously. The scan rates were 50, 100 and 150 mV/s, respectively. As a result, monolayer and multilayer LB films of polyimide are appeared on irreversible process caused by the oxidation current from the cyclic voltammogram.

• 한국전기전자재료학회논문지
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• 제24권4호
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• pp.309-313
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• 2011

In this study, we proposed a novel electrode structure for the fringe field switching (FFS) mode LCD and performed a three-dimensional computer simulation to calculate the optical transmittance for the new structure. In the simulation Erickson-leslie equation and Berreman $4{\times}4$ matrix were used for obtaining the director distribution profiles of liquid crystal molecules and the electro-optical characteristics, respectively. Considering the complexity of the motional equation of the liquid crystal molecules, FDM (finite difference method) was used as a numerical method. From the results, We revealed that the light transmission of the newly designed pixel structure is expended to the edge of the pixel electrode. We also confirmed that the light transmittance increased more than 13% compared to that of the conventional electrode structure.

• 전기전자학회논문지
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• 제24권3호
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• pp.713-718
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• 2020

피부 활성점(경혈) 측정 방법은 편리성, 저비용 및 비 침습으로 측정하기 때문에 많은 생체정보를 얻기 위한 기술이다. 본 연구에서는 피부 아래에 활성점을 측정할 수 있는 장점이 있는 3전극 측정방법을 사용되었다. 임피던스측정방법은 측정실험 결과와 관련성이 있는 등가전기회로를 통해서 증명되었다. 활성점의 특성주파수는 주변 피부보다 15-30Hz 높고, 리액턴스는 35-77kΩ 더 작게 측정되었다. 이 기술은 비침습 측정 시스템을 이용해서 활성점과 주변피부의 리액턴스와 특성주파수를 정확하고 객관적으로 분석되었다.

• 한국수소및신에너지학회논문집
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• 제28권2호
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• pp.200-205
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• 2017

The three electrodes (carbon felt) were tested in all-vanadium redox flow battery (VRFB) to confirm the its usefulness. The electrode property was measured by the CV (cyclic voltammetry) method. The current ratio of maximum peak(IPA/IPC) in GF040BH5 and GF051BH3 had almost the same value compared to that in XF30A. The performances of VRFB using the each electrode were measured during 5 cycles of charge-discharge at the current density of $60mA/cm^2$. An average energy efficiency of the VRFB was 77.8%, 77.3%, and 79.2% for XF30A, GF040BH5 and GF051BH3, respectively. It was confirmed from the data that GF040BH5 and GF051BH3 is well suited for use in a VRFB as a electrode, like XF30A.

• 센서학회지
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• 제19권5호
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• pp.391-397
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• 2010

This paper proposes a differential structure sensor for detecting Ringer's solution exhaustion, in which three C-type electrodes of 10 mm width are disposed on a ringer hose at a distance of 5 mm each other in the direction of Ringer's solution flow. In the center of middle electrode, two capacitances are formed at the proposed sensor. When ringer hose is filled with Ringer's solution, there is no difference between two capacitances. But capacitance difference exist under the Ringer's solution shortage, because the shortage causes the hose filled with air from the top position electrode. The capacitance difference got to maximum 1.81 pF, when air was filled between top and middle electrode and the last of hose was filled with 10 % dextrose injection Ringer's solution. The capacitance difference varied with hose-wraparound coverage of electrodes as well as the width of them. For hose-wraparound electrode coverage of 90 % and 70 %, the maximum capacitance difference was 1.81 pF and 1.56 pF, respectively. A differential charge amplifier converted the capacitance difference to electric signal, and minimized electrodes' adhering problem and external noise coupling problem.

• 조명전기설비학회논문지
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• 제14권2호
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• pp.8-17
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• 2000

본 연구에서는 부분방전의 인식을 위한 두가지 접근법을 제안하였다. 첫 번째로는 백프로파게이션 알고리즘을 적용한 신경회로망이구 두 번째로는 두 연산자 백터간의 사이각 계산이다. 부분방전신호는 IEC(b), 침대평판 및 CIGRE method II 등 3가지 전극계로부터 각각 검출되었다. 신경회로망과 벡터의 사이각을 이용한 방법 모두 이리 학습된 패턴에 대해서는 양호한 인식능력을 보였다. 그려고 사용되는 연산자의 수가 미학습패턴의 인식능력에 큰 영향올 미쳤다.

• Bulletin of the Korean Chemical Society
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• 제26권4호
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• pp.548-552
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• 2005

The interaction between ionic surfactants and different nonionic molecules and polymers are studied using ion surfactant selective electrode. From the experimental data, critical concentrations of the interaction and binding process are evaluated. The interaction between hexadecyltrimethylammonium bromide (HTAB) with polyethylene glycol (PEG) in three molecular weights (1000, 10000 and 100000) and also schiff-bases, 2-[2-carboxyphenyl nitrilomethylidyne]-phenol (ortho CNP), 2-[3-carboxyphenyl nitrilomethylidyne]-phenol (meta CNP)and 2-[4-carboxyphenyl nitrilomethylidyne]-phenol (para CNP) with the potentiometric method were investigated using HTAB membrane selective electrode. In the case of PEG with increasing molecular weights more interaction to HTAB occurs. The electromotive force (EMF) data also showed that interaction between para CNP with HTAB is more than the other schiff-bases. It seems this case related to less space interference of COOH group for that compound. The onset of binding ($T_1$) of course is the same for three schiffbase molecules.

• 공업화학
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• 제33권5호
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• pp.523-531
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• 2022

A NiCo-metal organic framework (MOF) electrode, prepared using urea as a surfactant, was synthesized using a one-pot hydrothermal method. The addition of urea to the NiCo-MOF creates interstitial voids and an ultra-thin nanostructure in the NiCo-MOF, which improves its charge transfer performance. We obtained the optimal metal to surfactant ratio to achieve the best specific capacitance. The NiCo-MOF was employed as the working electrode material in a three-electrode system. Field emission scanning electron microscopy, X-ray diffraction, and Fourier-transform infrared spectroscopy were employed to characterize the microstructures and morphologies of the composites. Cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy curves were employed to quantify the electrochemical properties of the electrodes in a 6 M KOH electrolyte.

• 대한물리치료과학회지
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• 제4권2호
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• pp.399-403
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• 1997

The purpose of this study was to determine the efficacy of electrode placement on procaine iontophoresis. Thirty-three healthy students with an age range of 19 to 34 years, were participated in this study. The subjects were randomly assigned into 3 groups. Each subjects received iontophoresis on the proximal 1/3 of volar surface of dominant forearm with soft cotton pad($3.5{\times}3.5cm$) soaked in 2 ml of 4% procaine hydrochloride (pH 5.1) at 4 mA for 10 minutes(total current 40 mA min) of anodal DC. In transversal electrode placement(TEP) group, dispersive electrode was placed on the proximal 1/3 of dorsal surface of the forearm. In longitudinal electrode placement (LEP) group and control group, dispersive electrode were placed on the distal 1/3 of volar surface of the forearm. After procaine iontophoresis, duration of anesthesia were evaluated at five minutes intervals on five random locations in the iontophoretically area using a 21-gauge sterile hypodermic needle pressed with 1 mm invagination until return the sharp pin-pricking pain sensation. The data were ana lysed with one-way ANOVA to determine signific~nt differences between groups. The results showed significantly differences in the local anesthetic duration between the 3 groups(p<0.001). The anesthetic durations of TEP group and LEP group were significantly longer when compared with control group(p<0.05). Anesthetic durations of TEP group and LEP group were not significantly difference, but anesthetic duration of LEP group tends to longer than TEP group. In view of these results, clinicians should consider the electrode placement method when performing the iontophoresis.