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Jeon, Yongwon,Kim, Jun Hyun,Koo, Kyoungmin,Kim, Sunghyun Elsevier 2018 Journal of Power Sources Vol.373 No.-
<P><B>Abstract</B></P> <P>A microbial electrolysis cell (MEC) has been regarded as an emerging new technology for the biohydrogen production from various organic substances, even from wastewater. One major problem is, however, that methane dominates produced gases in a long-term operation. Here we report that a photo-assisted MEC (PAMEC) is an efficient way to produce hydrogen with a p-type semiconductor cathode. When Cu<SUB>2</SUB>O coated with MoS<SUB>2</SUB> as cocatalyst (MoS<SUB>2</SUB>/Cu<SUB>2</SUB>O) is employed, only hydrogen with essentially no methane and carbon dioxide was produced from acetate at −0.8 V bias under visible light illumination at a rate of 2.72 m<SUP>3</SUP>H<SUB>2</SUB> m<SUP>−3</SUP>d<SUP>−1</SUP>. No appreciable performance degradation is observed over 50 days of operation. At lower bias voltage, methane and carbon dioxide begins to be produced. Energy efficiency based on input electricity and hydrogen yield are 225% and 3.4, respectively. This excellent feature of PAMEC is attributed to p-type semiconductor characteristics of Cu<SUB>2</SUB>O and proton reduction activity of MoS<SUB>2</SUB>. Electrons generated from acetate oxidation at the anode are photoexcited to the conduction band at the Cu<SUB>2</SUB>O acquiring enough reduction potential to reduce protons. The concept of PAMEC can be extended to wastewater treatment for the hydrogen production.</P> <P><B>Highlights</B></P> <P> <UL> <LI> MoS<SUB>2</SUB>-coated p-type Cu<SUB>2</SUB>O is used as photocathode for hydrogen production in PAMEC. </LI> <LI> H<SUB>2</SUB> is exclusively produced at −0.8 V under visible light with no CH<SUB>4</SUB> and CO<SUB>2</SUB>. </LI> <LI> Energy efficiency of 225% and hydrogen yield of 3.4 are achieved. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
장용원(YongWon Jang),신승철(SeungChull Shin),전영주(YoungJoo Jeon),김승환(SeungHwan Kim) 대한전자공학회 2006 대한전자공학회 학술대회 Vol.2006 No.11
This study concentrates on measuring and analyzing biosignal using conducting fabric electrode. Because of conductiong fabric, we could integrate the ECG electrode into wearable shirts. We tested wearable device during exercise such as running and walking and verified the function as reliable. The measured biosignals from the wearable shirts arc used as the raw data of our program which analyze the ECG and can make useful result such as speed of exercise, gait, acceleration, etc.
Hydrogen Production from Makgeolli Wastewater Using a Single-Chamber Microbial Electrolysis Cell
김준현,Changhoon Kim,Yongwon Jeon,Sunghyun Kim 대한화학회 2020 Bulletin of the Korean Chemical Society Vol.41 No.2
Domestic and industrial wastewaters are subject to the biological treatment process before discharged to environment. In that process, organic substances contained in the wastewater are degraded by microorganisms. Microbial electrolysis cells (MECs) are suitable technology for wastewater treatment, simultaneously producing hydrogen. In most case, however, a significant amount of methane instead of hydrogen is produced when the wastewater is used for MECs. Here we show that hydrogen is the main product when Makgeolli wastewater (MW) is used as a substrate in a single-chamber MEC which was operated using acetate and MW. Although current generation profiles vary according to the substrate type and the applied voltage, hydrogen portions were maintained over 90% at ?0.6 V and ?0.8 V with production rates of 0.95 and 1.55 m3H2/m3/d, respectively. This result shows a possibility of implementing MECs in the real wastewater treatment and hydrogen production.
반복적 상호작용을 통한 사용자의 의사전달 모호성 감소 및 언어기반 협동 로봇 팔의 작업 성공률 향상에 관한 연구
김민욱(Minuk Kim),서용원(Yongwon Seo),전예찬(Yechan Jeon),이원형(Wonhyong Lee) 한국정보기술학회 2024 Proceedings of KIIT Conference Vol.2024 No.5
로봇은 사용자의 단방향적인 명령에 의해 작업을 실행한다. 그렇기에 명령 과정에서 불명확한 명령이나 예기치 못한 상황에 의해 정보를 구체적으로 입력하지 않으면 원하는 작업대로 로봇이 작동하게 유도하기 힘들다는 한계를 가지고 있다. 따라서 지속적인 상호작용을 통한 정보의 확인은 협동로봇에게 필수적인 요건이다. 본 연구의 주요 목적은 LLM을 이용한 지속적인 상호작용을 통해 모호하거나 불가능한 명령에 대한 처리 능력을 향상함으로 유연성을 극대화하는 것에 있다. Robots execute tasks based on the users unidirectional commands. Therefore, it has the limitation that if commands are unclear or unexpected situations arise without specifically inputting the information, it is difficult to guide the robot to operate as desired. Consequently, iterative interaction for verifying information is an essential requirement for collaborative robots. The primary aim of this study is to maximize flexibility by enhancing the capability to handle ambiguous or impossible commands through iterative interaction using LLM (Large Language Model).
양창훈(Changhoon Yang),박대진(Daejin Park),전용원(yongwon Jeon),강구배(Gubae Kang),한대웅(Daewoong Han) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper describes design procedure of DC-LINK film capacitor for inverter in HEV. To improve reliability of film capacitor, pattern metalized film used as a dielectric and an electrode is adopted. The proposed film capacitor is designed to have high reliability in optimal size and operation range.