• Journal of Electrochemical Science and Technology
• /
• 제2권3호
• /
• pp.152-156
• /
• 2011

A hybrid supercapacitor is fabricated using a composite material from $LiMn_2O_4$ (LMO) and activated carbon (AC) as the positive electrode and AC as the negative electrode to form the (LMO + AC)/AC system. Volume ratio (positive : negative) of electrodes is controlled to investigate of the power and energy balance. The (LMO + AC)/AC system shows better performances than the LMO/AC system. Especially, electrochemical impedance spectra, rate charge.discharge and cycle performance testing show that the (LMO + AC)/AC system have an outstanding electrochemical performance at volume ratios of (LMO + AC)/AC = 1 : 1.7 and 1 : 2. Electric double layer capacitor (EDLC) capacitance between AC of the positive electrode and AC of the negative electrode improves power density without loss of capacitance. Stable capacitance is achieved by lowering the positive electrode resistance and balancing the energy and power densities between the positive and negative electrodes by the addition of AC to the positive electrode at high current density.

• 전기학회논문지
• /
• 제63권10호
• /
• pp.1448-1454
• /
• 2014

In this study, a new type of electrode device is implemented to measure the capacitance energy and interpret it as the ECG (Electrocardiogram) data. The main idea of this new electrode system is to estimate the capacitance on the skin by assembling a capacitive-coupled circuits and translate into the ECG signal. To measure the coupling energy and estimate the aquired data in terms of heart activity, the capacitive-coupled electrode is garmented with fabrics in the form of a chest band or a vest jacket. To compare the ECG data from the capacitive-coupled electrode with the conventional electrode(Ag-AgCl) system, the corelation coefficient between two signals is computed as 0.9517. Thus, we can conclude the fact that capacitive-coupled electrode system can measure a person's heart activity without any contact to his or her skin and can the interpreted as the ECG data.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2002년도 추계학술대회 논문집
• /
• pp.218-222
• /
• 2002

Micro-EDM is generally used far machining micro holes, pockets, and 3-D structures. For micro-EDM, first of all, micro-electrode fabrication is needed and WEDC system is proposed for tool electrode fabrication method. When tool electrode is fabricated using WEDG system, its characteristics are under the control of many EDM parameters. Also relations between the parameters affect electrode fabrication. In this study, experiments are carried out to analyze effects of EDM parameters about electrode surface integrity on micro-electrode fabrication. Experimental method and analysis are used to experimental design method. Factors used in experiments are composed of capacitance, resistance, pause time, wire feed rate, spindle rotating speed. As a result of experiments, capacitance and resistance affect electrode surface.

• 한국전기전자재료학회논문지
• /
• 제26권3호
• /
• pp.227-231
• /
• 2013

Electrodeionization is a hybrid separation process of electrodialysis and ion exchange to produce high purity water under electric field. This article provides a fabrication result of hole patterned metal electrode for elecrodeionization system. The hole patterns have been fabricated by nanosphere lithography (NSL). The technique utilizes the self-assembled nanospheres as lens-mask patterns and collimated laser beam source. The hole patterns have a periodic array structure. The images of hole pattern on metal electrode prepared were observed by SEM. We believe that the periodic hole patterned metal electrode structure is a useful device applicable for metal mat electrode in electrodeionization system.

• 전기학회논문지
• /
• 제59권12호
• /
• pp.2256-2261
• /
• 2010

A corona discharge system with needle point or wire type corona electrode has been well used as an ionic wind blower. The corona discharge system with a needle point electrode produces ions at lower applied voltage effectively. However, the corona discharge on the needle point electrode transits to the arc discharge at lower voltage, and it is hard to obtain the elevated electric field in the discharge airgap for enhancing the ion migration velocity due to the weak Coulomb force. A cylindrical corona electrode with sharp round tip is reported as one of effective corona electrode, because of its higher breakdown voltage than that of the needle electrode. A basic study, for the effectiveness of cylindrical electrode shape on the ionic wind generation, has been investigated to obtain an maximum wind velocity, which however is the final goal for the real field application of this kind ionic wind blower. In this paper, a parametric study for maximizing the ionic wind velocity utilizing the cylindrical corona electrode and a maximum ion wind velocity of 4.1 m/s were obtained, which is about 1.8 times higher than that of 2.3m/s obtained with the needle corona electrode from the velocity profile.

• 한국해양공학회:학술대회논문집
• /
• 한국해양공학회 2006년 창립20주년기념 정기학술대회 및 국제워크샵
• /
• pp.177-180
• /
• 2006

This study is to make a basic study if solid zinc (Zn) can be used for buried reference electrode, so we examined the adequacy of zinc as reference electrode by using zinc which showed regular electrode for buried period. The deference of electric potential if zinc electrode for corrosion factor such as soil resistivity or pH didn't show fixed trend and there was no clear trend on the change of measurement period. From field test, it is known that the natural electric potential difference of CSE electrode and zinc electrode is 1,100mV, but the electric potential of zinc electrode for CSE electrode in the natural soil and copying soil was 1,094~1,158mV. There was no fixed trend on the change of measurement period and electric potential difference of zinc electrode for corrosion factors such as soil resistivity or pH. Consequently, there was 40~60mV of electric potential difference in every copying soil during the experiment measurement.

• Journal of Microbiology and Biotechnology
• /
• 제20권3호
• /
• pp.485-493
• /
• 2010

A modified graphite felt electrode with neutral red (NR-electrode) was shown to catalyze the chemical oxidation of nitrite to nitrate under aerobic conditions. The electrochemically oxidized NR-electrode (EO-NR-electrode) and reduced NR-electrode (ER-NR-electrode) catalyzed the oxidation of $1,094{\pm}39$ mg/l and $382{\pm}45$ mg/l of nitrite, respectively, for 24 h. The electrically uncharged NR-electrode (EU-NR-electrode) catalyzed the oxidation of $345{\pm}47$ mg/l of nitrite for 24 h. The aerobic bacterial community immobilized in the EO-NR-electrode did not oxidize ammonium to nitrite; however, the aerobic bacterial community immobilized in the ER-NR-electrode bioelectrochemically oxidized $1,412{\pm}39$ mg/l of ammonium for 48 h. Meanwhile, the aerobic bacterial community immobilized on the EU-NR-electrode biochemically oxidized $449{\pm}22$ mg/l of ammonium for 48 h. In the continuous culture system, the aerobic bacterial community immobilized on the ER-NR-electrode bioelectrochemically oxidized a minimal $1,337{\pm}38$ mg/l to a maximal $1,480{\pm}38$ mg/l of ammonium to nitrate, and the community immobilized on the EU-NR-electrode biochemically oxidized a minimal $327{\pm}23$ mg/l to a maximal $412{\pm}26$ mg/l of ammonium to nitrate every two days. The bacterial communities cultivated in the ER-NR-electrode and EU-NR-electrode in the continuous culture system were analyzed by TGGE on the $20^{th}$ and $50^{th}$ days of incubation. Some ammonium-oxidizing bacteria were enriched on the ER-NR-electrode, but not on the EU-NR-electrode.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2001년도 추계학술대회 논문집 Vol.14 No.1
• /
• pp.585-588
• /
• 2001

Thin. Boron-doped conducting diamond films are expected to be excellent electrodes for industrial electrolysis. Boron-doped conducting diamond films were used as anode for generating ozone gas by electrolysis of acidic solution. In this work, we have studied ozone generating system using Boron-doped Diamond electrode. Electrochemical cell and ozone generating system were designed for decreasing the temperature of the system. which was elevated during the reaction. by circulation of electrolyte in the system. In order to determine the ozone generation properties of diamond electrode. experimental conditions, electrolyte concentration, temperature, flow rate and reaction time were varied diversely. As a result, we could confirm that ozone gas was generated successfully and the performance of diamond electrode was stable while $PbO_2$ electrode was disintegrated. Actually we are found that ozone amount increased by lowering the temperature of electrolyte.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2001년도 추계학술대회 논문집
• /
• pp.585-588
• /
• 2001

Thin, Boron-doped conducting diamond films are expected to be excellent electrodes for industrial electrolysis. Boron-doped conducting diamond films were used as anode for generating ozone gas by electrolysis of acidic solution. In this work, we have studied ozone generating system using Boron-doped Diamond electrode. Electrochemical cell and ozone generating system were designed for decreasing the temperature of the system, which was elevated during the reaction. by circulation of electrolyte in the system. In order to determine the ozone generation properties of diamond electrode, experimental conditions, electrolyte concentration, temperature, flow rate and reaction time were varied diversely. As a result, we could confirm that ozone gas was generated successfully and the performance of diamond electrode was stable while PbO$_2$ electrode was disintegrated. Actually we are found that ozone amount increased by lowering the temperature of electrolyte.

• 대한임상검사과학회지
• /
• 제49권3호
• /
• pp.300-307
• /
• 2017

뇌파검사는 영상검사와는 달리 기능검사로 간질을 진단하고 뇌와 관련된 질환들의 진단에 도움이 된다. 뇌파검사를 시행하는 임상병리사의 가장 중요한 점은 정확한 전극 부착 위치를 확인하여 전극을 부착하고 인공산물을 제외한 순수한 뇌파를 기록하는 것에 있다. 이를 위하여 교과과정에서 이론적인 부분과 함께 실습을 포함시키고 있다. 그러나 고가의 장비와 실습시간의 부족 때문에 충분한 실습을 할 수 없는 실정이다. 본 연구에서는 위에 언급된 사항을 해결하고자 연습용 10-20 Electrode system을 제작하여 설문지를 통해 만족도와 실용성을 확인하고자 한다. 연습용 10-20 Electrode system을 사용한 실습시간은 $43.58{\pm}9.647$분으로 측정되어 효율성을 확인하였다. 또한 교과과정 중 뇌파검사 실습을 진행한 학생(유경험자)의 만족도는 $7.21{\pm}2.285$점, 연습용 10-20 Electrode system을 사용한 실습 만족도는 $9.46{\pm}1.166$점으로 상당 부분 향상되었다. 세부적으로 보면 유경험자는 교과과정 중 실습할 때 전극 부착 위치만 확인하고, 전극은 단체로 붙여보는 실습을 했고. 애로사항 중 전극 부착위치가 찾기 어려움이 가장 높게 나타났다. 무경험자는 교과과정 중 뇌파 장비의 부재로 인해 실습을 하지 못했다. 연습용 10-20 Electrode system을 사용하여 실습했을 때는 전극 부착위치를 찾는 것과 전극(풀)을 부착하는 어려움이 교과과정 중 실습할 때와 마찬가지로 가장 많이 아쉬움으로 나타났다. 위에 언급된 내용을 보면 연습용 10-20 Electrode system을 사용하여 실습을 하게 되면 부족한 장비와 실습시간으로 인한 문제점을 해결 가능할 것이라고 사료된다. 그러나 연습용 10-20 Electrode system의 실제 뇌파 확인, 정확한 부착위치 확인 등 한계점을 개선하여 좀 더 실현성 있는 실습도구가 되도록 연구가 필요하고 더 나아가 다른 분야도 마찬가지로 고가의 장비로 인해 어려운 부분을 해결할 수 있을 것이라 기대한다.