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고분자 전해질 연료전지용 수소극 촉매층의 이오노머 함량 영향
박범준,이선호,우승희,박석희,정남기,임성대 한국수소및신에너지학회 2019 한국수소 및 신에너지학회논문집 Vol.30 No.6
For the low-Pt electrodes for polymer electrolyte fuel cells (PEMFCs), the optimization of ionomer content for anode catalyst layers was carried out. A commercial catalyst of 20 wt.% Pt/C was used instead of 50 wt.% Pt/C which is commonly used for PEMFCs. The ionomer content varies from 0.6 to 1.2 based on ionomer to carbon ratio (I/C) and the catalyst layer is formed over the electrolyte by the ultrasonic spray process. Evaluation of the prepared MEA in the unit cell showed that the optimal ionomer content of the air electrode was 0.8 on the I/C basis, while the hydrogen electrode was optimal at the relatively high ionomer content of 1.0. In addition, a large difference in cell performance was observed when the ionomer content of the hydrogen electrode was changed. Increasing the ionomer content from 0.6 to 1.0 by I/C in a hydrogen electrode with 0.05 mg/cm2 platinum loading resulted in more than double cell performance improvements on a 0.6 V. Through the analysis of various electrochemical properties in the single cell, it was assumed that the change in ionomer content of the hydrogen electrode affects the water flow between the hydrogen and air electrodes bounded by the membrane in the cell, which affects the overall performance of the cell. A more specific study will be carried out to understand the water flow mechanism in the future, and this study will show that the optimization process of hydrogen electrode can also be a very important cell design variable for the low-Pt and high-performance MEA.
Visual Cell : 바이오세포 이미지 빅데이터를 위한 이미지 분석 및 시각적 검색 시스템
박범준,조선화,이수안,신지운,유혁상,김진호 사)한국빅데이터학회 2019 한국빅데이터학회 학회지 Vol.4 No.1
The extracellular matrix, which provides the structural and biochemical support of surrounding cells, is a cell physiological modulator that controls cell division and differentiation. In the bio sector, the company produces Scapold, a three-dimensional support for tissue engineering, and cultivates stem cells in the produced Scapold to be transplanted into animals to assess tissue regeneration. This depends on components such as collagen in the tissue. Therefore, it is very important to identify the inclusion rate and distribution of components in the tissue, and the data are obtained by analyzing the color of the dyed tissue image. The process from image collection to analysis is costly, and the data collected and analyzed are managed in different formats by different research institutions. Therefore, data integration management and analysis results search are not being performed. In this paper, we establish a database that can manage relevant bigdata in an integrated manner, and propose a bio-image integrated management and retrieval system that can be searched based on color, an important analytical measure in this field of study.
박범준,김수헌,곽철환,Kugalur Ranjith Shanmugam,한영규,조영진,허윤석 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-
In this work, we fabricate porous cesium lead bromide nanofibers (CsPbBr3 NFs) via electrospinning andemploy them in a sensor to effectively detect both gaseous and aqueous ammonia. The CsPbBr3 NFs areproduced byfirst mixing cesium lead bromide nanocrystals (CsPbBr3 NCs) with polystyrene (PS),followed by solidifying the mixture into NFs using electrospinning. Porous NFs are modified using thevolatile solvent toluene, which is volatilized during the electrospinning process. The applicability of theproposed CsPbBr3 NFs for use under various environmental conditions is verified by analyzing theirstability in response to changes in temperature, moisture level and pH, which are critical drawbacks ofCsPbBr3 NCs. Gaseous ammonia (9 mg L 1) in an N2 carrier is subsequently detected using thephotoluminescence (PL) properties of the CsPbBr3 NFs. In addition, an ammonia concentration of 100.0mg L 1 in an aqueous solution can be detected using the PL intensity. Therefore, we believe that theproposed CsPbBr3 NFs show significant promise for use in detection sensors to assess the extent of fooddecay, allowing customers to purchase fresh agricultural products more safely.
정상인에서 신체적 요인이 체중 치우침과 입각기에 미치는 영향
박범준,박시복,박종우,이승조,이규훈 대한재활의학회 2008 Annals of Rehabilitation Medicine Vol.32 No.5
Objective: To determine if physical factors (age, sex, weight, foot length) affected anteroposterior and intersidal weight- bearing pattern on footplate in standing posture and duration of stance phase at walking.Method: Participants were 578 healthy adults (250 men, 328 women). All participants were tested by GaitviewⓇ (Alfoots, Seoul, Korea) which measure anteroposterior, intersidal weight-bearing pattern on foot plate and duration of stance phase at walking. Measurements were analyzed to find any relations among physical factors (age, sex, weight, foot length), anteorposterior, intersidal weight-bearing pattern and stance phase. Results: The age, weight, foot length had no specific relations to anteroposterior weight-bearing pattern (r<0.2, p<0.05). Men had greater weight-bearing pattern on forefoot than women (p<0.01). The higher the age, the more midstance and the more delayed stance phase was noted (r>0.4, p<0.01).Conclusion: There was a significant correlation between sex and anteroposteior weight-bearing pattern. And there was a positive relation between age and stance, midstance phase.