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폴리에틸렌글리콜이 부착된 그래핀 옥사이드 충진재를 함유하는 고체상 고분자 전해질 복합막의 제조 및 전고체 리튬이차전지로의 응용
심지민,김동균,김희중,이진홍,백지훈,이종찬 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
A series of composite polymer electrolytes were prepared using an organic/inorganic hybrid branched-graft copolymer (BCP) based on poly(ethylene glycol) methyl ether methacrylate (PEGMA) and methacryl isobutyl polyhedraloligomeric silsesquioxane (MA-POSS) as polymer matrix and poly(ethylene glycol)-grafted graphene oxide (PGO) as filler materials, and they were applied as solid-state polymerm electrolytes (SPEs) for lithium-ion battery applications. It was found out that thermal/mechanical stability, ionic conductivity, and all-solid-state battery performance were dramatically improved by incorporating PGO fillers.
Size Determination of Iron Oxide Nanoparticles Using Modified Single Particle ICP-MS
심지민,임흥빈 한국분석과학회 2021 학술대회논문집 Vol.2021 No.11
One of the most important concerns in the semiconductor production process is particle contamination management. For this, various techniques, such as SEM, TEM, and ICP-MS, have been used in the field. Among them, ICP-MS provides a lot of potential to achieve the purpose since it has outstanding capability for reliable quantification, size distribution and particle concentration determination. Iron oxide particle is one of the frequently observed contaminants in the manufacturing process. Nevertheless, it is difficult to determine it due to severe polyatomic interference and poor sensitivity in ICP-MS. The size estimation model recently developed in our lab showed excellent correlation of the integrated area of the peak to the cubic of Au particle radius through the data analysis based on Window Peak Selection and Gauss Fitting. In this work, iron oxide (Fe₂O₃) nanoparticles was studied for further proof and practical application. Since aggregation was extremely critical for the iron oxide nanoparticles, which deteriorated the accuracy of size determination, the influence of sonication time was seriously evaluated for the sample preparation. As the sonication time increased, the FeNPs were dispersed well in the solution, but their average intensity of the peaks tended to be decreased due to the appearance of many low intensity peaks caused by particle cracking. Therefore, the sonication time was optimized at 15 min for 5 and 10 nm and 5 min for 30 nm of FeNPs. The developed size estimation model showed good correlation of known particle size with corresponding integrated peak area, of which the obtained regression coefficients of R² were in the range of > 0.9991. The obtained correlation function of y = ax³ + b or ∛(y – b) = ax, can be used as a tool for fast determination of unknown particles in the process, indicating the great opportunity for on-line monitoring. In order to achieve such a high performance in the production line, blank subtraction and uncertainty of calibration process was inevitably studied, so the developed method can achieve high reliability and eventually apply to control the particle impurities in the semiconductor manufacturing process.
패스트푸드 전문점 키오스크 이용객들의 충성도에 대한 탐구
심지민,이원석,문준호 한국마이스관광학회 2022 MICE관광연구 Vol.22 No.4
Kiosks are a widely used system in fast food business, and have become more important during the COVID-19 period. This research thus aims to understand the behavior of kiosk users. Loyalty is the explained element, while non-contact, ease of use, and promptness are the explanatory variables. This study implemented an online survey to collect the data. A total of 202 observations were used for the data analysis. For testing the research hypotheses, multiple linear regression was conducted. The results unveiled that kiosk loyalty is positively associated with non-contact, ease of use, and promptness. This study also exhibited that monthly household income and using frequency of fast food kiosk significantly affects loyalty. This research presents practical implications for the operation of fast food business