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이준기(Rhee, Junki),박상선(Park, Sangsun),설용건(Shul, Yong-Gun) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
Autothermal reforming(ATR) processes of hydrocarbon liquids such as diesel fuels are spotlighted as methods to produce hydrogen for Fuel cell. However, the use of heavy hydrocarbons as feedstocks for hydrogen production causes some problems which increase the catalyst deactivation by the carbon deposition. Coking can be inhibited by increasing the water dissociation on the catalyst surface. This results in catastrophic failure of whole system. Performance degradation of diesel autothermal reforming leads to increase of undesirable hydrocarbons at reformed gases and subsequently decrease the performance. In this study, perovskite-based catalysts were investigated as alternatives to substitute the noble metal catalyst for the ATR of diesel. The investigated perovskite structure was based on LaCrO3. and metals were added at the A-site to enhance oxygen ion mobility, transition metals were doped on the B-site to enhance the reformation. Substituted Lanthanum chromium perovskite were made by aqueous combustion synthesis, which can produce high surface area. And for the homogeneous fuel supply, we made ultrasonic injection system for reforming. We compared durability of evaporation system and ultrasonic system for fuel injection.
대기오염물질로 인한 연료전지자동차 출력 변화에 대한 연구
이준기(Junkee Rhee),박상선(Sangsun Park),설용건(Yong-Gun Shul) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Fuel cell is spotlighted as next energy source of future. The fuel of vehicle will be changed from fossil fuel such as gasoline, diesel to hydrogen. Polymer electrolyte membrane fuel cell(PEMFC) will be used to fuel cell vehicle because of its suitability. PEMFCs need oxygen for cathode. Because PEMFCs in vehicle use air for oxygen, air pollutant will be effect to performance of PEMFC. In this study, we examine a type of filter and pollutant gas how can be effect to performance of fuel cell electric vehicle.
컴퓨팅적 사고능력의 향상을 위한 아동 교육용 모바일 블록코딩 게임 연구 개발
이준기(Joonki Rhee),현영우(Youngwoo Hyun),김지훈(Jihoon Kim),송준혁(Junhyuk Song),유준상(Junsang Yoo),김상진(Sangjin Kim) 한국정보기술학회 2022 Proceedings of KIIT Conference Vol.2022 No.6
본 논문에서는 현재 교육용 블록 코딩 프로그램의 사례와 문제점에 대해 분석하고 해결 방법으로 유니티 게임엔진을 이용한 아동 교육용 모바일 블록 코딩 게임을 제안한다. 스마트폰에 익숙한 아이들이 쉽고 빠르게 학습에 임할 수 있도록 모바일 게임으로 제작하였고 직관적인 블록을 통해 선행지식 없이도 게임을 진행할 수 있다. 게임 내 다양한 스테이지는 아이들의 성취감을 얻게 해줄 뿐 만 아니라 지속적인 흥미를 유발할 수 있다. 게임 이용자가 답이 정해지지 않은 문제를 논리적으로 해결하는 과정을 통해 창의력 향상을 기대할 수 있다. This paper analyze problems of current games for coding education and propose mobile block coding game for children’s education through Unity 3D as solution. We produced this application for mobile to make children used to using smartphone faster and feel easy to learning. Also children can play the game without prior knowledge through intuitive code blocks. Various stages in the game give a more sense of accomplishment as well as arousing interest to children. It’s expected to improve user who play this game’s creativity through process to solve problems without fixed answer logically.
대기오염물질로 인한 연료전지자동차 출력 변화에 대한 연구
이준기(Rhee, Jun-Ki),박상선(Park, Sang-Sun),설용건(Shul, Yong-Gun) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11
Fuel cell is spotlighted as next energy source of future. The fuel of vehicle will be changed from fossil fuel such as gasoline, diesel to hydrogen. Polymer electrolyte membrane fuel cell(PEMFC) will be used to fuel cell vehicle because of its suitability. PEMFCs need oxygen for cathode. Because PEMFCs in vehicle use air for oxygen, air pollutant will be effect to performance of PEMFC. In this study, we examine a type of filter and pollutant gas how can be effect to performance of fuel cell electric vehicle.
냉시동 환경에서 thermal cycle이 FEMFC의 MEA 열화에 미치는 영향
이준기(Rhee, Jun-Kee),서동호(Seo, Dong-Ho),전유권(Jeon, Yu-Kwon),설용건(Shul, Yong-Gun) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
In recent times, starting up polymer electrolyte membrane fuel cells(PEMFC) in sub-zero condition is a great challenge of fuel cell electric vehicle(FCEV). The water produced in a cathode during PEMFCs operate. The water changes into the form of solid/ice in sub-zero temperatures and this makes trouble in PEMFC cells. Voltage of PEMFC drops and cold startup is failed. This paper describes an experimental study on the effect of thermal cycle to degradation of MEA in PEMFC.
The development of complex electrode for fuel cell using CNT
옥진희(Ok, Jinhee),이준기(Rhee, Junki),Altalsukh, Dorjgotov,Rhee, Junki,박상선(Park, Sangsun),설용건(Shul, Yonggun) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
Carbon nanotube(CNT) has been spotlighted as a promising candidate for catalyst support material for PEMFC (proton exchange membrane fuel cell). The considerable properties of CNT include high surface area, outstanding thermal, electrical conductivity and mechanical stability. In this study, to fully utilize the properties of CNTs, we prepared directly oriented CNT on carbon paper as a catalyst support in the cathode electrode. The CNT layer was prepared by a chemical vapor deposition(CVD) process. And the Pt particles were deposited on the CNT oriented carbon paper by impregnation and eletro-deposition method. The potential advantages of directly oriented CNT on carbon paper can include improved thermal and charge transfer through direct contact between the electrolyte and the electrode and enhanced exposure of Pt catalyst sites during the reaction.
The development of PEMFC cathode using polyol method with directly grown CNT on carbon paper
옥진희(Ok, Jinhee),이준기(Rhee, Junki),Altalsukh, Dorjgotov,박상선(Park, Sangsun),설용건(Shul, Yonggun) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
Since the discovery of the carbon nanotube(CNTs), they have attracted much attention because of unique properties that may impact many fields of science and technology. The considerable properties of CNTs include high surface area, outstanding thermal, electrical conductivity and mechanical stability. However, uniform deposition of Pt nanoparticles on carbon surface remains inaccessible territory because of the inert carbon surface. In this study, we prepared directly oriented CNTs on carbon paper as a catalyst support in cathode electrode. carbon surface was functionalized using aryl diazonium salt for increasing adhesion of Ni particles which is precursor for growing CNTs. For fabricate electrode, CNTs on carbon paper were grown by chemical vapor deposition using Ni catalyst and Pt nanoparticles were deposited on CNTs oriented carbon paper by polyol method. The performance was measured using Proton electrolyte Membrane Fuel Cell(PEMFC). The structure and morphology of the Pt nanoparticles on CNTs were characterized by Scanning electron Microscopy(SEM) and Transmission electron Microscopy (TEM). The average diameter of Pt nanoparticles was 3nm.
김화영(Hwayoung Kim),김형민(Hyungmin Kim),송민수(Minsu Song),안지훈(Jihun An),김강현(Ganghyun Kim),김선민(Sunmin Kim),김찬현(Chanhyun Kim),박성우(Seoungwoo Park),이준우(Junu Lee),이준기(Joonki Rhee),임재혁(Jaehyuk Im),정승수(Seungsu Jeo 한국추진공학회 2022 한국추진공학회 학술대회논문집 Vol.2022 No.5
본 논문은 경기대학교 KURBC 팀이 설계한 모듈형 신기전K22에 대한 설계과정과 그 근거를 서술하였다. 로켓의 임무는 ‘로켓 발사 후 낙하 시 낙하산 사출 및 안전한 회수’이다. 목표 고도는 400m, 연료는 질산칼륨-소르비톨(KNSB)이다. 낙하산 사출 방법은 동체와 낙하산이 안전하게 보호되는 용수철 사출을 선택했다. 본 팀은 이번 대회에서 CFRP 카본으로 로켓의 동체를 만들고, 내부를 모듈로 구성함으로써 차별점을 두었다. 또한 RF 장거리 통신 기술을 이용하여 발사 전후의 데이터를 체계적으로 기록하여 후속 연구에 참고할 예정이다. This paper describes the design process and basis for the modular Shinkijeon-K22 designed by the KURBC team of Kyonggi University. The rockets mission is devising a method for parachute injection and safe recovery when falling after launching the rocket. The target altitude is 400 m and the fuel is potassium nitrate-solvitol (KNSB). The spring injection method was used for the parachute injection, in which the fuselage and parachute are safely protected. We made a difference by making the rockets fuselage with CFRP carbon and configuring the interior as a module. In addition, RF long-distance communication technology will be used to systematically record data before and after launch and refer it to subsequent studies.
先天性 幽門部 憩室症 : Report of a Case
朴聖德,李奇麟,李駿基,金子勳 최신의학사 1967 最新醫學 Vol.10 No.6
A man, 48 years of age, who has had several episodes of hematemesis and melena during his youth, was admitted in shock state because of the massive hematemesis, and the clinical impression was given as peptic ulcer. Exploration revealed a saccular diverticulum with a concrement, 5em in diameter; 7cm in deepness, and 3cm in ostial diameter, near the pyloric ring at the anterior gastric wall, and an active ulcer with scar formation was observed from the opposite site to the diverticular ostium at the posterior gastric wall. No adhesion with neighboring organs was noticed. Macroscopically, the diverticular wall was normal in thickness with intact mucosa. And so hemigastrectomy was performed. Microsopically, the wall of the diverticulum possessed all layers, i.e., mucosa, submucosa, well developed muscle coats and subserosa, showing mild chronic inflammatory cell infiltration throughout all layers, and the covering mucosa was of typical pyloric type with pyloric glands. Submucosa was edematous and hemorrhagic. Literature concerning the diverticula of the stomach was reviewed and the present case was thought to be a congenital pyloric diverticulum.
DEAE-C Column Chromatography에 依한 臍帶血淸 免疫抗體(IgG)의 純粹分離에 關한 硏究
權寧朝,金勝煜,李駿基,林壽德 최신의학사 1967 最新醫學 Vol.10 No.6
Pure IgG was isolated from the cord sera by DEAE-C column chromatograph using 0.02 M sodium phosphate buffer, pH 8.0. The procedure has been proved to be a relatively simple method for separation of gamma globulin from serum, and applied many times with the recovery rate of about 70%.The purity of the IgG obtained was proved by the microimmunoelectrophoretic technic and animal immunization followed by double gel diffusion test. A comprehensive comment on the analytic methods of the serum protein and concept of the immunoglobulins was also described.ㄴ