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Flexible high-energy Li-ion batteries with fast-charging capability.
Park, Mi-Hee,Noh, Mijung,Lee, Sanghan,Ko, Minseong,Chae, Sujong,Sim, Soojin,Choi, Sinho,Kim, Hyejung,Nam, Haisol,Park, Soojin,Cho, Jaephil American Chemical Society 2014 NANO LETTERS Vol.14 No.7
<P>With the development of flexible mobile devices, flexible Li-ion batteries have naturally received much attention. Previously, all reported flexible components have had shortcomings related to power and energy performance. In this research, in order to overcome these problems while maintaining the flexibility, honeycomb-patterned Cu and Al materials were used as current collectors to achieve maximum adhesion in the electrodes. In addition, to increase the energy and power multishelled LiNi0.75Co0.11Mn0.14O2 particles consisting of nanoscale V2O5 and LixV2O5 coating layers and a LiδNi0.75-zCo0.11Mn0.14VzO2 doping layer were used as the cathode-anode composite (denoted as PNG-AES) consisting of amorphous Si nanoparticles (<20 nm) loaded on expanded graphite (10 wt %) and natural graphite (85 wt %). Li-ion cells with these three elements (cathode, anode, and current collector) exhibited excellent power and energy performance along with stable cycling stability up to 200 cycles in an in situ bending test.</P>
Kim Minseong,Yeo MyungGu,Lee KyoungHo,Park Min-Jeong,Han Gyeongyeop,Lee Chansong,Park Jihyo,Jung Bongsu 한국조직공학과 재생의학회 2024 조직공학과 재생의학 Vol.21 No.1
Background: Collagen is a key component of connective tissue and has been frequently used in the fabrication of medical devices for tissue regeneration. Human-originated collagen is particularly appealing due to its low immune response as an allograft biomaterial compared to xenografts and its ability to accelerate the regeneration process. Ethically and economically, adipose tissues available from liposuction clinics are a good resource to obtain human collagen. However, studies are still scarce on the extraction and characterization of human collagen, which originates from adipose tissue. The aim of this study is to establish a novel and simple method to extract collagen from human adipose tissue, characterize the collagen, and compare it with commercial-grade porcine collagen for tissue engineering applications. Methods: We developed a method to extract the collagen from human adipose tissue under quasi-Good Manufacturing Practice (GMP) conditions, including freezing the tissue, blood removal, and ethanol-based purification. Various techniques, including protein quantification, decellularization assessment, SDS-PAGE, FTIR, and CD spectroscopy analysis, were used for characterization. Amino acid composition was compared with commercial collagen. Biocompatibility and cell proliferation tests were performed, and in vitro tests using collagen sponge scaffolds were conducted with statistical analysis. Results: Our results showed that this human adipose-derived collagen was equivalent in quality to commercially available porcine collagen. In vitro testing demonstrated high cell attachment and the promotion of cell proliferation. Conclusion: In conclusion, we developed a simple and novel method to extract and characterize collagen and extracellular matrix from human adipose tissue, offering a potential alternative to animal-derived collagen for xeno-free tissue engineering applications. Background: Collagen is a key component of connective tissue and has been frequently used in the fabrication of medical devices for tissue regeneration. Human-originated collagen is particularly appealing due to its low immune response as an allograft biomaterial compared to xenografts and its ability to accelerate the regeneration process. Ethically and economically, adipose tissues available from liposuction clinics are a good resource to obtain human collagen. However, studies are still scarce on the extraction and characterization of human collagen, which originates from adipose tissue. The aim of this study is to establish a novel and simple method to extract collagen from human adipose tissue, characterize the collagen, and compare it with commercial-grade porcine collagen for tissue engineering applications. Methods: We developed a method to extract the collagen from human adipose tissue under quasi-Good Manufacturing Practice (GMP) conditions, including freezing the tissue, blood removal, and ethanol-based purification. Various techniques, including protein quantification, decellularization assessment, SDS-PAGE, FTIR, and CD spectroscopy analysis, were used for characterization. Amino acid composition was compared with commercial collagen. Biocompatibility and cell proliferation tests were performed, and in vitro tests using collagen sponge scaffolds were conducted with statistical analysis. Results: Our results showed that this human adipose-derived collagen was equivalent in quality to commercially available porcine collagen. In vitro testing demonstrated high cell attachment and the promotion of cell proliferation. Conclusion: In conclusion, we developed a simple and novel method to extract and characterize collagen and extracellular matrix from human adipose tissue, offering a potential alternative to animal-derived collagen for xeno-free tissue engineering applications.
KSAE 대학생 자작자동차 대회용 차량의 설계방안 사례
박도영(Doyoung Park),김민성(Minseong Kim),김균언(Gyuneon Kim),장우형(Woohyeong Jang),이병우(Byeoungu Lee),문원진(Wonjin Moon),김경환(Kyeonghwan Kim),박경민(Kyungmin Park),강민우(Minwo Kang),강병관(Byeongkwan Kang),박규열(Kyuyeol Park 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
In this paper, a designing case of the Formula-style vehicle for KSAE student Formula competition is introduced. The 250cc engine vehicle is built for the competition and the designing process is composed of five modules. During the designing project, the fundamental performance of the modules was evaluated using FEM. For example, the frame design was focused on weight reduction and it was built by CATIA V5, and FEM method was used to analyze the designed frame on static and dynamic characteristics. In case of optimized the cowl shape, FLUENT was used to get the drag and lift coefficient from the cowl shape. In detail, to optimize the cowl shape, aerodynamic modeling was carried out and the final shape was determined. As a result, the 250cc engine vehicle for KSAE student Formula competition was built and the fundamental performance was investigated.
Minseong Kim,Sung-Wook Hong,Jin Beak Park 한국방사성폐기물학회 2017 방사성폐기물학회지 Vol.15 No.4
중·저준위방사성폐기물 표층처분시설 인간침입시나리오의 ‘평가/해석에 대한 불확실성’의 관리를 위해 GENII를 이용 한 평가결과를 오염토양에 대한 방사선영향평가를 위해 개발된 RESRAD를 이용하여 검증하였다. 중저준위방사성폐기물 표 층처분시설의 인간침입시나리오로 시추후거주시나리오를 선정하여 각 코드의 현상 모사에서 발생하는 한계점을 파악하고 동일한 입력데이터 조건에서 두 코드의 평가결과를 비교분석함으로써 모델링의 불확실성을 분석하였다. 평가결과 각 코드 에서 일부 핵종의 거동모사에 대한 차이는 있었으나 폐쇄후관리기간 이후 선량평가 결과 모든 피폭경로에 대한 경향이 유사 함을 확인하였다. 또한 RESRAD에서 확인한 선량평가 결과를 바탕으로 입력인자에 대한 민감도 분석을 수행하고 주요입력 인자를 도출하였다. 이를 통해 모델링 결과 및 입력인자에 대한 불확실성을 분석하고 안전성평가 결과에 대한 신뢰성을 확 인하였다. 본 연구의 결과는 중저준위방사성폐기물 처분시설의 Safety Case 구축에 활용될 수 있다. In order to manage the uncertainty about the evaluation and analysis of the human intrusion scenario of the Gyeongju Low and Intermediate Level Radioactive Waste(LILW) disposal facility, the calculation result by the GENII code was assessed using the RESRAD code, which was developed to evaluate the radiation effects of contaminated soil. The post-drilling scenario was selected as a human intrusion scenario into the near-surface disposal facility to analyze the uncertainty of the modeling by identifying any limitations in the simulation of each code and comparing the evaluation results under the same input data conditions. The results revealed a difference in the migration of some nuclides between the codes, but confirmed that the dose trends at the end of the post-closure control period were similar for all exposure pathways. Based on the results of the dose evaluation predicted by RESRAD, sensitivity analysis on the input factors was performed and major input factors were derived. The uncertainty of the modeling results and the input factors were analyzed and the reliability of the safety evaluation results was confirmed. The results of this study can be applied to the implementation ‘Safety Case Program’ for the Gyeongju LILW disposal facility.
돼지 대동맥판막을 이용한 이첨판 대동맥판막 후류 유동 분석
권민성(Minseong Kwon),박성호(Sungho Park),허형규(Hyungkyu Huh) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
Aortic valvular stenosis where calcium accumulates in the valve and the valve hardens is the most common heart valve disease in developed countries. The type of aortic valves is generally divided into tricuspid aortic valve (TAV) and congenital malformation bicuspid aortic valve (BAV) stenosis. Although flow characteristics of TAV have been well established, that of BAV is still not fully unelucidated. In this study, we proposed an ex vivo flow visualization platform by using a pig heart. Normal TAV and BAV models were prepared by aortic valve plastic surgery. Valve wake flow characteristics of normal TAV and BAV were compared by using 4D flow magnetic resonance imaging. Normal TAV exhibited that the valve was fully opened during systole, while the valve of BAV was partially opened. The Stroke volume of the normal TAV and BAV were similar. However, the peak velocity of BAV was higher than that of the TAV. The effect of malfunction of BAV on hemodynamics was systematically analyzed. This study would be helpful for diagnosing aortic stenosis and understanding prognosis prediction especially for aortic stenosis patients with BAV.
NATM 터널의 굴착면 전방 지질 평가를 위한 대구경 심발공 탐사 시스템 개발 및 적용 사례
김민성(Minseong Kim),정진혁(Jinhyeok Jung),이제겸(Jekyum Lee),박민선(Minsun Park),박정현(Jeonghyeon Bak),이승원(Sean Seungwon Lee) 한국암반공학회 2021 터널과지하공간 Vol.31 No.1
최근 도시화가 가속화됨에 따라 지하공간 개발을 위한 굴착공사가 지속적으로 이루어지고 있으며, 암반굴착 시 해당 구간의 지질 상태를 정확히 파악하는 것은 안전한 시공을 위해 매우 중요하다. 본 논문에서는 터널 발파 진동을 저감시키기 위해 대구경 무장약공을 천공하는 MSP 공법을 활용하여 굴착면 전방의 지질 특성을 파악하기 위해 천공경로 및 지반탐사 복합시스템을 개발하였다. 제안된 탐사 시스템은 NATM 터널 공사를 위해 천공된 대구경 심발공을 활용해 굴착면 전방 50 m 구간의 지질 정보를 획득할 수 있다는 큰 장점이 있다. 또한, 제안된 탐사 시스템을 현장에 적용하고 대구경 무장약공 내부를 모니터링하여 터널 굴착면 전방의 지질 상태를 평가한 사례를 소개한다. Recently, the development of underground space has been accelerated with rapid urbanization, and it is significantly important for safe construction to accurately understand the geological conditions of the section when excavating rocks. In this paper, a boring alignment tracking and geological exploration system have been developed to identify the geological conditions beyond the excavation face by utilizing a MSP method that bores a large empty hole to reduce blast-induced vibration. The major advantage of the proposed exploration system is that we can obtain the ground condition of 50 m ahead of the excavation face through exploration along blast cut-holes drilled for the NATM tunnel construction. In addition, we introduce several case histories regarding the assessment of the geological conditions beyond the tunnel face by monitoring the inside of large empty holes using the proposed hole exploration system.