http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Preparation of silica-based proton conductors for intermediate temperature fuel cells
Dongho Seo,Sangsun Park,설용건 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.4
The ternary system SiO2-P2O5-ZrO2 electrolyte and phosphotungstic acid (PWA) doped SiO2-P2O5-ZrO2 electrolyte were prepared for intermediate temperature fuel cell by using sol-gel technique. These silica-based proton conductors were confirmed to be non-crystalline structure without phase separation and good thermal stability by XRD and TG/DTA analysis. The doped PWA was found to be stabilized within the silica matrix and to enhance the proton conductivity. The proton conductivities of SiO2-P2O5-ZrO2 and SiO2-P2O5-ZrO2-PWA electrolytes showed 3.3×10−5 and 1.8×10−3 S/cm at 90℃, respectively, and the cell performance of SiO2-P2O5-ZrO2-PWA electrolyte was obtained as 0.02-0.25 mA/㎠ at 300℃ under humid condition.
Effect of operating temperature using Ni-Al-ZrH<sub>2</sub> anode in molten carbonate fuel cell
서동호(Seo, Dongho),장성철(Jang, Seongcheol),윤성필(Yoon, Sungpil),남석우(Nam, Suk Woo),오인환(Oh, In-Hwan),임태훈(Lim, Tae-Hoon),홍성안(Hong, Seong-Ahn),한종희(Han, Jonghee) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
Fuel cell is a device that directly converts chemical energy in the form of a fuel into electrical energy by way of an electrochemical reaction. In the anode for a high temperature fuel cell, nickel or nickel alloy has been used in consideration of the cost, oxidation catalystic ability of hydrogen which is used as fuel, electron conductivity, and high temperature stability in reducing atmosphere. Most MCFC stacks currently operate at an average temperature of 650?C. There is some gains with decreased temperature in MCFC to diminish the electrolyte loss from evaporation and the material corrosion, which could improve the MCFC life. However, operating temperature has a strong related on a number of electrode reaction rates and ohmic losses. Baker et al. reported the effect of temperature (575 to 650?C). The rates of cell voltage loss were 1.4mV/?C for a reduction in temperature from 650 to 600?C, and 2.16mV/?C for a decrease from 600 to 575?C. The two major contributors responsible for the change in cell voltage with reducing operation temperature are the ohmic polarization and electrode polarization. It appears that in the temperature range of 550 to 650?C, about 1/3 of the total change in cell voltage with decreasing temperature is due to an increase in ohmic polarization, and the electrode polarization at the anode and cathode. In addition, the oxidation reaction of hydrogen on an ordinary nickel alloy anode in MCFC is generally considered to take place in the three phase zone, but anyway the area contributing to this reaction is limited. Therefore, in order to maintain a high performance of the fuel cell, it is necessary to keep this reaction responsible area as wide as possible, that is, it is needed to keep the porosity and specific surface area of the anode at a high level. In this study effective anodes are prepared for low temperature MCFC capable of enhancing the cell performance by using zirconium hydride at least in part of anode material.
유해화학물질 누출사고시 피해 최소화를 위한 초기대응 연구
서동호(Dongho Seo),이봉우(Bong-woo Lee) 한국위험물학회 2018 한국위험물학회지 Vol.5 No.2
Firefighting is an organization that can respond to complex accidents such as chemical accidents, rapid on-site access in the event of a disaster, and life-saving. Especially, when responding to hazardous substances spill accidents, the firefighting team conducts disaster prevention activities in a way that safety of members and secondary harmful substances do not occur. In this study, we have arranged the on-site response sequence to minimize the damage in case of leakage of toxic chemicals by reviewing the previous research of acidic chemical such as hydrofluoric acid and carrying out experimental of basic chemicals such as ammonia water through neutralization, adsorption and dilution tests. This paper proposes a method of using portable scrubber which can effectively decontaminate toxic gas also.
공진 방사체 임피던스 측정을 이용한 고효율 안테나 회로 설계 연구
서동호(Dongho Seo),김용주(Yong Joo Kim),윤원상(Won-Sang Yoon),한상민(Sang-Min Han) 대한전기학회 2022 전기학회논문지 Vol.71 No.1
A new antenna design method with high efficient characteristics is proposed by measuring input impedance of a radiative resonator. By means of a simple de-embedding method, the resonant frequency and input impedance are measured for antenna resonators. Retaining the resonant antenna characteristics, an impedance-matched feedline can be designed. In order to verify the validation, the patch antenna has been implemented with the proposed method. From the experimental results, the proposed antenna design has presented well matching property, a higher antenna gain, and higher radiation efficiency, compared to a reference patch antenna implemented by a conventional design method.
드론 위치 추정을 위한 초광대역 기반 측위 알고리즘 연구
신동호 ( Dongho Shin ),홍성호 ( Sungho Hong ),김상호 ( Sangho Kim ),이재열 ( Jaeyoul Lee ),서갑호 ( Kapho Seo ),서진호 ( Jinho Seo ),김상훈 ( Sanghoon Kim ) 한국정보처리학회 2021 한국정보처리학회 학술대회논문집 Vol.28 No.1
근래의 드론 산업은 다양한 분야에서 사용이 확대되고 있으나 규제 등 여러 가지 사회적 진입장벽으로 시장 진입에 애로사항이 도출되고 있다. 본 논문에서는 드론 산업의 여러 제약 중 배터리의 제한적인 용량으로 장시간 비행이 어려운 문제를 개선하고자 승강식 드론스테이션을 개발하였다. 승강식 드론스테이션은 드론의 비행 중 배터리가 방전될 시 충전 및 정비를 할 수 있고, 드론 간의 통신중계기 역할을 수행한다. 본 논문에서는 스테이션에 드론이 접근 시 슬라이딩 도어를 개폐하기 위하여 초광대역 통신을 이용한 거리 측정과 위치 인식 시스템에 대한 내용을 기술하였다.