http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Low temperature preparation of Pt alloy electrocatalysts for DMFC
송민우(Song, Min-Wu),이경섭(Lee, Kyeong-Seop),김영순(Kim, Young-Soon),신형식(Shin, Hyung-Shik) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11
The electrodes are usually made of a porous mixture of carbon-supported platinum and ionomers. SnO₂ particles provide as supports that have been used for DMFCs, and it have high catalytic activities toward methanol oxidation. The main advantage of SnO₂ supported electrodes is that it has strong chemical interactions with metallic components. The high activity to a synergistic bifunctional mechanism in which Pt provides the adsorption sites for CO, while oxygen adsorbs dissociative on SnO₂. The reaction between the adsorbed species occurs at the Pt/SnO₂ boundary. The morphological observations were characterized by FESEM and transmission electron microscopy (TEM). SnO₂ particles crystallinity was analyzed by the X-ray diffraction (XRD). The surface bonded state of the SnO₂ particles and electrode materials were observed by the X-ray photoelectron spectroscopy (XPS). The electric properties of the Pt/SnO₂ catalyst for methanol oxidation have been investigated by the cyclic voltametry (CV) in 0.1M H₂SO₄ and 0.1M MeOH aqueous solution. The peak current density of methanol oxidation was increased as the SnO₂ content in the anode catalysts increased. Pt/SnO₂ catalysts improve the removal of CO ads species formed on the platinum surface during methanol electro-oxidation.
렌즈안테나에서의 도래각 추정을 위한 머신러닝 기반의 저복잡도 시스템
송민우(Min-Woo Song),박홍석(Hongseok Park),김동구(Dong-Gu Kim) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.6
본 논문은 V2X(Vehicle-to-Everything) 환경에서 저복잡도의 렌즈 MIMO (Multiple input multiple output) 송수신 빔 포밍 구현을 위한 도래각 추정 성능 향상을 위해 머신러닝 기반의 시스템을 제안한다. 차량용 렌즈 MIMO 에서는 적은 수의 안테나를 사용하여 렌즈 안테나를 구성한다. 이 경우 기존의 방식인 수신 빔 패턴을 통하여 도래각을 추정하는 시스템의 한계를 머신러닝을 통해 보완하는 알고리즘을 만들 수 있으며 그 성능을 확인하였다.
송민우(Minwoo Song),김대현(Daehyeon Kim),최찬용(Chanyong Choi) 한국지반신소재학회 2015 한국지반신소재학회 논문집 Vol.14 No.1
TDR을 이용한 흙의 건조밀도와 함수비의 새로운 보정 방정식을 검증하기 위해 본 연구를 수행하였다. 기존의 보정 방정식이 제안되고 몇몇 연구자들에 의해 새로운 보정 방정식을 개발하는 연구가 진행되고 있다. 기존의 보정 방정식이 함수비가 높은 세립토와 느슨한 토질에서는 적용되기 어려워 새로운 보정 방정식을 개발하였다. 이에 따라 본 연구에서는 새로운 보정 방정식을 소개하고 기존의 실험과 비교해 새로운 보정방정식의 국내지반과의 적용성을 검토를 수행하였다. 그 결과 함수비의 보정방정식에 오차가 발생하여 함수비의 새로운 보정방정식을 개발하였고, 개발한 보정방정식을 검토한 결과 95%이상의 정확도를 보여준다. The objective of the study is to verify a new calibration equation of dry density and water contents with TDR. Since the traditional calibration equation was proposed, some research to develop a new calibration equation has been conducted by several researchers. As traditional calibration equation is difficult to be applied for loose soil and fine-grained soil at high water contents, this study developed a new calibration equation. Thus, this study introduces a new calibration equation and its applicability by comparing TDR test results with conventional test results. Based on the analyses, the calibration equation for water content has large error. A new calibration equation was proposed and it showed more than 95% accuracy for estimating water content of soil.
송민우(Min Woo Song),김태형(Tae-Hyung Kim),김양수(Yang-Su Kim),최현열(Hyun-Yul Cho),김헌영(Heon Young Kim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Installed in the rear side of an automobile, the rear trailing arm absorbs the external forces inflicted on the tire and thereby improves the ride quality. High strength and durability are prerequisite to the rear trailing arm and each automobile maker has its own evaluation method. This paper has adopted the approach of a numerical analysis in order to figure out a method for strength analysis and for performance enhancement of the rear trailing arm. The rubber bush fitted into the rear trailing arm can be described by use of solid elements. However, this approach requires modeling and analyzing, and therefore is time-consuming. For that reason, we have decided to formulate a finite element model using 1D element. 1D element has been expressed in stiffness of each direction. Its reliability has been confirmed by the comparison of the tests and the analyses. In addition, since the rear trailing arm absorbs the buckling impact while an automobile is in motion, we have appraised the quality of the currently mass-produced products through the test of the buckling impact on and the analysis of the strength of a unit.
송민우(Minwoo Song),김완민(Wanmin Kim),김대현(Daehyeon Kim),최찬용(Chanyong Choi) 한국지반신소재학회 2016 한국지반신소재학회 논문집 Vol.15 No.3
본 연구는 기존의 다짐관리 방법에서 다짐이 완료된 지반의 일부를 손상시켜야 하는 단점을 해결하기 위하여 진행되었다. 본 연구를 통하여 판형 Probe를 제작하였고, 제작한 Probe에 탄성파 측정 장치인 Piezoelectric stack을 결합하였다. 개발한 TDR 시스템을 이용하여 시간에 따른 개량토의 강도 변화를 측정하였다. 실험 결과, 압축탄성계수 및 전단탄성계수는 각각 78.92MPa에서 587.09MPa, 31.53MPa에서 182.44MPa로 증가함을 확인할 수 있었다. 실험 결과를 통하여 개발한 TDR 시스템을 이용하여 현장에서 개량지반의 시간경과에 따라 지반개량효과 및 다짐관리에 유용하게 활용할 것으로 기대된다. This study was conducted to solve the problem such as damage of completed compaction ground using the conventional compaction control method. In this study, a TDR system equipped with a flat type probe has been developed. Also, the Piezoelectric stack, which is an instrument for measuring the elastic wave on the ground, has been added to the developed flat type probe. In this study, the strength variation of reinforced soil with time was determined by using the TDR system. The value of compression and shear modulus increased from 198.65MPa to 541.80MPa and from 125.55MPa to 302.02MPa with time, respectively. Based on the test results, it has been confirmed that the developed TDR system can be used as reinforced effect analysis of soil and compaction control.
송민우(Minwoo Song),김대현(Daehyeon Kim),최찬용(Chanyong Choi) 한국철도학회 2016 한국철도학회 학술발표대회논문집 Vol.2016 No.5
철도 및 도로의 다짐관리를 위하여 흙의 함수비 및 건조밀도는 중요한 요소로 작용하며, TDR(Time Domain Reflectometry) 시스템을 이용한 현대식 다짐관리 방법이 이용되고 있다. 하지만 TDR 시스템에서도 발생할 수 있는 문제가 있으며, 이를 최소화 하기 위하여 본 연구는 진행되었고, 본 연구를 통하여 판형 Probe를 개발하였으며 개발한 시스템의 검증을 위하여 실측 값과 TDR 시스템을 이용한 측정 값을 비교하였고, 그 결과 기존의 TDR 시스템과 개발한 TDR 시스템의 정밀도를 비교한 결과 비슷한 수준의 정밀도를 얻을 수 있었다. Soil water content and dry density are important factor to manage compaction of the railroad and road. The modern compaction control is used for measuring water content and dry density by using the TDR(Time domain Reflectometry). However, some problems are able to occur when TDR system is used. This study was conducted to minimize problems. In this study, flat-type probe is developed. Also, to verify the developed TDR system, TDR tests were examined by comparison of the measured values by TDR and the real value. Based on the test results, it has been confirmed that accuracy of the developed TDR system is similar with previous TDR system.