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최만수,김승은,윤인호,정종헌,최왕규,문제권,김선병,Choi, Mansoo,Kim, Seung-Eun,Yoon, In-Ho,Jung, Chong-Hun,Choi, Wang-Kyu,Moon, Jei-Kwon,Kim, Seon-Byeong Korean Radioactive Waste Society 2018 방사성폐기물학회지 Vol.16 No.2
As part of planning for waste minimization, decontamination foam has been considered as a potential application for the cleaning of radioactive contaminant. In this study, we synthesized silica particles to improve foam stability by varying synthesis parameters. Cetyltrimethylammonium bromide (CTAB) was found to influence the stability of the decontamination foam. The reason was that higher interaction between $SiO_2$ nanoparticles and surfactant at the air-water interface in aqueous solution is beneficial for foam stability. CTAB can also be used as an additive for the aggregation of silica nanoparticles. In the separation of $SiO_2$ nanoparticles, CTAB plays a critical role in the nanoparticles flocculation because of the charge neutralization and hydrophobic effects of its hydrocarbon tails.
도서지역 적용을 위한 230 kW급 저풍속 중형 풍력발전기의 전자장해석
최만수(Mansoo Choi),최혜원(Hyewon Choi),이창민(Changmin Lee),최현준(Hyenjun Choi) 한국신재생에너지학회 2020 신재생에너지 Vol.16 No.2
Recently, a project to build a carbon zero island with no carbon emissions has been carried out by replacing diesel generators with renewable energy sources in island areas where diesel generators supplied local loads as independent systems. To minimize damage to the lives of islanders, low noise wind generators should be installed by adjusting the rated speed. In islands with low loads, wind turbines that are more efficient than medium-sized wind turbines should be installed. In this study, the generator field analysis and characteristics were analyzed to develop 230 kW-class low wind medium-wind turbine technology. The electromagnetic field analysis program used Maxwell. As a result, the cogging torque was reduced, and the initial maneuver wind speed and loss value were lowered. Hence, the output amount was increased with high efficiency.
레이저가 조사된 아세틸렌에서의 임계전이를 거쳐서 형성된 쉘 형상 카본 나노입자에 관한 연구
최만수(Mansoo Choi),Igor S.Altman(Igor S. Altman),김영정(Young-Jeong Kim),Peter V.Pikhitsa(Peter V. Pikhitsa),이상훈(Sanghoon Lee) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
Shell shaped hollow carbon nanoparticles are synthesized in the oxygen-hydrogen diffusion flame with C₂H₂ as precursor when it is irradiated with CO₂ laser of certain power. Below this power of laser, we couldn’t get any other but amorphous soot. This shell shaped hollow carbon nanoparticles shows outer wall of high degree of crystallinity with void space inside of itself. And size distribution of these nanoparticles is measured with TEM image analysis. Also the structural comparison between this carbon nanoparticle and soot is done by Raman and XRD measurement. These results show this carbon nanoparticles are of grapheme structure, which means it has good crystallinity when compared with soot.
풍력터빈 PM형 동기발전기의 와전류손실과 열 해석에 관한 연구
최만수(Man Soo Choi),장영학(Young Hag Chang),박태식(Tae Sik Park),정문선(Moon Seon Jeong),문채주(Chae Joo Moon) 대한전기학회 2014 전기학회논문지 Vol.63 No.11
In this paper, eddy current loss, iron loss and heat transfer of PMSG with 2,000kW capacities were analyzed for wind turbine. The PMSG with 3 split magnet was analyzed using ansoft maxwell commercial program and, generator was tested by Back to Back converter with no load condition at laboratory. Rotor surface temperature was measured by Pt100 sensors for investigating heat transfer from rotor to atmosphere. The simulation results shows 27.4㎾ eddy current loss in no load condition and 50.2㎾ eddy current loss in rated load condition with 3 split magnet, and also shows 4.3㎾ iron loss in no load condition and 7.3kW iron loss rated load condition. The heat transfer coefficient of convection between rotor surface and atmosphere was investigated by 9.6 W/㎡·K. Therefore the heat transfer from rotor to atmosphere was about 17㎾(54%) and from rotor to air-gap was about 14.6㎾(46%) in no load condition. It is identified that the cooling system for stator have to include the 46% of iron loss, and heat dissipation structure of rotor surface have to be suggested and designed for efficiency improvement of generator.
풍력터빈 적용을 위한 PMSG용 영구자석의 와전류손실에 관한 연구
최만수(Man-Soo Choi),문채주(Chae-Joo Moon),쑨루이(Sun Rui),장영학(Young-Hak Chang),박태식(Tae-Sik Park),정문선(Moon-Seon Jeong),곽승훈(Seung-Hun Kwak) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.2
The objective of this paper is to suggest a design topology of permanent magnet synchronous generator with 2,000kW capacities for wind turbine. The suggested topology is to provide 3 split magnet PMSG instead of single magnet, and performed an analysis of eddy current loss and iron loss for suggested type using ansoft maxwell commercial program. The simulation results of suggested magnet type show there duction of eddy current loss as 13.87kW with loadless conditions and23.48kW with rated conditions, but iron loss for rotor yoke show the in creasing trend as2.2kW with loadless conditions and 0.2kW with rated conditions. The suggested 3 split maget type is to identified as more useful for 2,000kW PMSG.
1m급 인공위성 레이저추적 시스템용 고속·고정밀 추적마운트 개발 및 예비 성능분석
최만수(Man-Soo Choi),임형철(Hyung-Chul Lim),이상정(Sang-Jung Lee) 한국항공우주학회 2016 韓國航空宇宙學會誌 Vol.44 No.11
본 연구에서는 국내 최초 개발 예정인 1m급 인공위성 레이저추적 시스템(Satellite Laser Ranging, SLR)의 추적마운트 (Tracking Mount) 모듈 개발을 위한 예비설계 및 성능분석 결과를 제시한다. 인공위성 레이저추적 시스템은 위성까지의 거리를 정밀하게 측정하는 시스템으로 지상의 관측소에서 반사경을 탑재하고 있는 인공위성까지 레이저를 발사하여 되돌아오는 레이저 사이의 시간간격을 측정하는 시스템으로서, 현존하는 인공위성까지의 거리측정 시스템 중 가장 정밀한 측정 시스템이다. 본 논문에서 제안하는 인공위성 레이저 추적 시스템용 고속·고정밀 추적마운트의 추적범위는 고도 300 km에서 정지궤도(고도 36,000 km)까지 가능하며, 레이저 반사경을 탑재한 인공위성에 대해 주·야간 레이저추적이 가능해야 한다. 이러한 요구사항을 만족하기 위해, 본 연구에서는 고속·고정밀 추적마운트기구부 설계 및 구조해석을 수행하였고, 추적마운트의 원활한 제어를 위한 모션 제어 시스템을 설계하여 예비 성능 분석을 실시한 결과를 소개하였다. This paper presents preliminary design and performance analysis of a fast and high precision Tracking Mount for 1m Satellite Laser Ranging(SLR) which is development by Korea Astronomy and Space science Institute(KASI). SLR is considered to be the most accurate technique currently available for the precise orbit determination of Earth satellites. The SLR technique measures the time of flight between pulses emitted from laser transmitter and pulses returned from satellites with laser retro-reflector array. It provides millimeter level precision of range measurements between SLR stations and satellites. A fast and high precision Tracking Mount for SLR which is proposed in this research should be capable of day and nighttime laser tracking about the satellites with laser reflectors from 200 km to 36,000 km altitude(geosynchronous orbit). In order to meet this requirement, we performed mechanical design and structural analysis for Tracking Mount. Also we designed the motion control system and conducted pre-performance analysis to obtain good performance results for a fast and high precision Tracking Mount.