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Minjae Kwon,Jeong Hoon Park,Beom-SuJang,정현 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.8
“Cat’s eye”-shaped [57Co]CoO@SiO2 core-shell nanostructure was prepared by the reverse microemulsion method combined with radioisotope technique to investigate a potential imaging agent for a single photon emission computed tomography (SPECT) in nuclear medicine. The core cobalt oxide nanorods were obtained by thermal decomposition of Co-(oleate)2 precursor from radio isotope Co-57 containing cobalt chloride and sodium oleate. The SiO2 coating on the surface of the core cobalt oxide nanorods was produced by hydrolysis and a condensation reaction of tetraethylorthosilicate (TEOS) in the water phase of the reverse microemulsion system. In vivo test, micro SPECT image was acquired with nude mice after 30 min of intravenous injection of [57Co]CoO@SiO2 core-shell nanostructure.
Kwon, Minjae,Park, Jeong Hoon,Jang, Beom-Su,Jung, Hyun Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.8
"Cat's eye"-shaped $[^{57}Co]CoO@SiO_2$ core-shell nanostructure was prepared by the reverse microemulsion method combined with radioisotope technique to investigate a potential imaging agent for a single photon emission computed tomography (SPECT) in nuclear medicine. The core cobalt oxide nanorods were obtained by thermal decomposition of $Co-(oleate)_2$ precursor from radio isotope Co-57 containing cobalt chloride and sodium oleate. The $SiO_2$ coating on the surface of the core cobalt oxide nanorods was produced by hydrolysis and a condensation reaction of tetraethylorthosilicate (TEOS) in the water phase of the reverse microemulsion system. In vivo test, micro SPECT image was acquired with nude mice after 30 min of intravenous injection of $[^{57}Co]CoO@SiO_2$ core-shell nanostructure.
전환반응 기반 전이금속산화물 리튬이온전지 음극 활물질 개발 동향과 전망
권민재(Minjae Kwon),박종윤(Jongyoon Park),황종국(Jongkook Hwang) 한국세라믹학회 2022 세라미스트 Vol.25 No.2
The rapid increase in demand for high-performance lithium ion batteries (LIBs) has prompted the development of high capacity anode materials that can replace/complement the commercial graphite. Transition metal oxides (TMOs) have attracted great attention as high capacity anode materials because they can store multiple lithium ions (electrons) per unit formula via conversion reaction, resulting in high specific capacity (700-1,200 mAh g⁻¹) and volumetric capacity (4,000-5,500 mAh cm⁻³). In addition, TMOs are cheap, earth-abundant, non-toxic and environmentally friendly. However, there have been no reports of practical LIBs using conversion-based TMO anodes, because of several major problems such as large voltage hysteresis, low initial Coulombic efficiency (large initial capacity loss), low electrical conductivity, and large volume changes (100~200%). This review summarizes the recent progress, challenges and opportunities for TMO anode materials. The conversion reaction mechanism, problems and solutions of TMO anode materials are discussed. Considering iron oxide as a promising candidate, future research directions and prospects for the practical use of TMO for LIB are presented.
에어컨 컴프레서 인버터 드라이브의 주변 부품 발열을 고려한 IPM의 온도 예측 모델에 관한 연구
권민재(Minjae Kwon),박찬수(Chansoo Park),박동민(Dongmin Park),한병철(Byeongcheol Han) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
IPM need to predict accurate temperatures in order to ensure reliability as power semiconductors that are often used in inverter drive. In this paper, we propose a more accurate temperature prediction method for IPM used in compressor inverter drive in window air conditioners. First, IGBT in IPM was modeled based on datasheet-based information, and then the loss value was calculated under the actual conditions in which the drive was driven. The next calculated loss value was used as a heat source for IPM, and the effects of heat generated by IPM peripheral components and PCB were also considered, and the temperature of IPM was predicted using FEM analysis. The predicted temperature results were compared with the actual measured results to validate the validity of the proposed method. We expect to enable a more reliable and efficient design by predicting the temperature of IPM in advance when designing an inverter drive.
소방활동 시 수소제트화염이 소방대원에 미치는 영향에 대한 실험적 연구
권민재(Minjae Kwon),이규민(Kyumin Lee),강성욱(Sungwook Kang),최정윤(Joung Yoon Choi) 한국화재소방학회 2021 한국화재소방학회 학술대회 논문집 Vol.2021 No.추계
2019년 정부의 「수소경제 활성화 로드맵」 발표 이후 후속조치로 「미래자동차 산업 발전 전략」, 「수소 인프라 및 충전소 구축 방안」 둥 수소 보급 확대 정책을 기반으로 수소전기자동차 및 수소충전소의 보급이 확대되고 있다. 한편 국내⋅외 수소관련시설의 사고( ‘19.05 강릉 수소탱크 폭발, ’19.06 노르웨이 수소충전소 폭발)의 발생으로 인하여 안전성에 대한 우려가 증대되고 있으며 이에 수소에너지의 설계지침, 관리기준, 대응방안에 대한 연구가 진행되고 있으나 법⋅제도로 도입까지는 미흡한 실정이다. 또한 소방청에서는 재난현장에서 신속하고 효율적인 현장대응을 통한 인적/물적 피해 최소화를 위하여 표준작전절차(Standard Operating Procedure, SOP)를 배포하고 있으나 수소충전소 및 수소전기자동차에 대한 대응절차가 없어 현재 개발이 진행중이다. 이에 본 연구에서는 최종 수소에너지 관련 시설의 SOP 개발을 위한 기초연구로 수소충전소 및 수소전기자동차에서 발생할 수 있는 수소제트화염의 위험성을 평가하고, 소방활동 중 소방대원이 수소제트화염 노출에 따른 화상발생위험성에 대하여 실험적인 연구를 진행하였다. 슐리렌 장치. 열화상카메라, 열유속계를 이용하여 수소제트화염의 위험성을 평가하였으며, 열유속 측정 및 화상예측 알고리즘을 통하여 화상위험성을 평가하였다.
A Quantitative A naly sis of the Fire Hazard Generated from Hydrogen Fuel Cell Electric Vehicles
Sungwook Kang(Sungwook Kang),Kyu Min Lee(Kyu Min Lee),Minjae Kwon(Minjae Kwon),Ohk Kun Lim(Ohk Kun Lim),Joung Yoon Choi(Joung Yoon Choi) 한국화재소방학회 2022 International Journal of Fire Science and Engineer Vol.36 No.2
There is a lack of information on (i) the potential fire load of new green-technology vehicles, (ii) flame spread behavior, (iii) thermal impacts on high-pressure hydrogen storage vessels (HSVs) and lithium-ion batteries (LIBs) during fuel cell electric vehicles fires (FCEVs), and (iv) thermal damage to adjacent vehicles and upper structural members during FCEV fires occurring in civil structures, such as underground spaces, multi-story parks, and tunnels. In view of this, a full-scale fire test was conducted in this study to quantitatively assess the fire risk of hydrogen FCEVs. Large-scale cone calorimetry was used to quantify the thermal intensity released from the FCEV fire. The flame spreading behavior through an FCEV with HSVs and LIBs was observed using the thermocouples installed. Changes in the temperature and irradiance around the FCEV fire were also measured using an instrumented test rig. The peak heat release rate, total heat released, and fire growth rate were observed to be 5.99 MW, 11.8 GJ, and 0.0055 kW/s², respectively. The temporal point of hydrogen gas release from the HSVs' thermal pressure relief device (TPRD) was estimated to be 16.2-26.2 min. The initiation of thermal runaway of LIBs was deduced from the temperature-time profiles of the LIB modules and their metal housing approximately 22.2 min after HCEV ignition. Moreover, FCEV fires could thermally impair adjacent upper structural members by 800 ℃ combustion gas for at least 13 min and emit a median heat flux of 27.2 kW/m² (peak heat flux of 76.5 kW/m²) to adjacent vehicles. The measurements and findings obtained from this study can contribute to the evaluation of and further studies on newly emerging fire hazards.
Design and Control of Pneumatic System for Recycling Classification of Non-Ferrous Metals
Minjae Cho,Eunsung Kwon,Kyi-Hwan Park 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.2
South Korea is a resource-dependent country that relies on the import of most metal resources. Therefore, we should save resources through recycling. In particular, the recycle rate of non-ferrous metals is very low. This is due to the limitations of the recycling technology currently in use. To overcome these limitations, non-ferrous metal recycling studies using laser induced breakdown spectroscopy are underway. In this paper, we will discuss an automatic metal classification system that receives metal information from a laser-induced breakdown spectrum and classifies a metal scrap by material. Currently, sorting systems use non-contact pneumatic systems. Compared to the contact method, the system is durable and is controlled at high-speed. This is because the system does not directly contact the metal scrap. Therefore, we will study how to effectively use the flow rate by modeling the pneumatic system.