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Miyeon Park,Meiyu Zhang,Da Wang,Jaeyeong Choi,Seungho Lee 한국분석과학회 2021 학술대회논문집 Vol.2021 No.11
Solid lipid nanoparticles (SLNs) have a particle structure in which a surfactant surrounds a lipid-containing material such as drug or cosmetics. SLNs have some merits that they can be mass-produced in a short period of time and that they can be used as a colloidal carrier in various types of products including cosmetics. It can carry ingredients such as UV filters, improving chemical and physical storage stability, and improving skin occlusion. Studies have shown that the UV protection effectiveness of UV filters encapsulated in SLN is affected by the size of SLNs. In this study, SLNs of various sizes were prepared by controlling the composition of lipid, surfactant, and UV filter. Then, the sizes of SLNs were characterized by using asymmetrical flow field-flow fractionation coupled with a photodiode array detector (AsFlFFF-PDA). The AsFlFFF conditions were optimized with the channel flow rate of 1.0 mL/min, cross-flow rate of 4.0 mL/min, and the composition of the carrier liquid of water containing 0.02% NaN₃. Results showed that the SLNs size increases with increasing lipid concentration and decreasing surfactant concentration. Sunscreen formations were prepared using the SLNs, and the sun protection factor (SPF), a UV protection index, was measured. The SPF tends to increase as the size of SLN decreases. However, the SPF values were relatively low, probably due to prolonged homogenization process during the SLN preparation. It is suggested to shorten the homogenization time.
Park, Jihoon,Ham, Seunghon,Jang, Miyeon,Lee, Jinho,Kim, Sunju,Kim, Sungkyoon,Lee, Kiyoung,Park, Donguk,Kwon, Jungtaek,Kim, Hyunmi,Kim, Pilje,Choi, Kyunghee,Yoon, Chungsik American Chemical Society 2017 Environmental science & technology Vol.51 No.13
<P>We evaluated the spatial-temporal dispersion of airborne nanomaterials during the use of spray consumer products and estimated the level of consumer inhalation exposure. A total of eight spray products including five propellant and three pump types were selected to evaluate the dispersion of airborne nanoparticles across time and space in a cleanroom which could control the background particles. Four products were advertised to contain silver and one contained titanium nanoparticles, while three products were specified no ENM but as being manufactured through the use of nanotechnology. We used direct-reading instruments with a thermodesorber unit to measure the particles (number, mass, surface area), as well as filter sampling to examine physicochemical characteristics. Sampling was conducted simultaneously at each location (1 m, near-field; 2, 3 m, far-field) by distance from the source. We estimated the inhaled doses at the breathing zone, and the doses deposited in each part of the respiratory tract using the experimental data and mathematical models. Nanoparticles released from the propellant sprays persisted in the air and dispersed over a large distance due to their small size (1466–5565 particles/cm<SUP>3</SUP>). Conversely, the pump sprays produced larger droplets that settled out of the air relatively close to the source, so the concentration was similar to background level (<200 particles/cm<SUP>3</SUP>). The estimates of inhalation exposure also suggested that exposure to nanoparticles was greater with propellant sprays (1.2 × 10<SUP>8</SUP> ± 4.0 × 10<SUP>7</SUP> particles/kgbw/day) than pump sprays (2.7 × 10<SUP>7</SUP> ± 6.5 × 10<SUP>6</SUP> particles/kgbw/day). We concluded that the propellant sprays create a higher risk of exposure than the pump sprays.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2017/esthag.2017.51.issue-13/acs.est.7b00211/production/images/medium/es-2017-00211d_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/es7b00211'>ACS Electronic Supporting Info</A></P>
Park, Jaena,Hwang, Miyeon,Choi, ByeongHyeon,Jeong, Hyesun,Jung, Jik-han,Kim, Hyun Koo,Hong, Sunghoi,Park, Ji-ho,Choi, Yeonho American Chemical Society 2017 ANALYTICAL CHEMISTRY - Vol.89 No.12
<P>Owing to the role of exosome as a cargo for intercellular communication, especially in cancer metastasis, the evidence has been consistently accumulated that exosomes can be used as a noninvasive indicator of cancer. Consequently, several studies applying exosome have been proposed for cancer diagnostic methods such as ELISA assay. However, it has been still challenging to get reliable results due to the requirement of a labeling process and high concentration of exosome. Here, we demonstrate a label-free and highly sensitive classification method of exosome by combining-enhanced (SERS) and statistical surface Raman, scattering pattern analysis. Unlike the conventional method to read different peak positions and amplitudes of a spectrum, whole SERS spectra of exosomes were analyzed by principal component analysis (PCA). By employing this pattern analysis, lung cancer cell derived exosomes were clearly distinguished from normal cell derived exosomes by 95.3% sensitivity and 97.3% specificity. Moreover, by analyzing the PCA result, we could suggest that this difference was induced by 11 different points in SERS signals from lung cancer cell derived exosomes. This result paved the way for new real-time diagnosis and classification of lung cancer by using exosome as a cancer marker.</P>
다종의 레이저 H₂O 광흡수 파장을 이용한 정밀 온도계측 및 광 경로 내 온도 구간 분석에 관한 연구
유미연(Miyeon Yoo),소성현(Sunghyun So),박지연(Jiyeon Park),김대해(Daehae Kim),박대근(Daegeun Park),이창엽(Changyeop Lee) 한국에너지기후변화학회 2019 에너지기후변화학회지 Vol.14 No.2
Temperature is a basic monitoring element for combustion efficiency improvement and pollutant gas reduction in a large combustion system. but it is very difficult that measuring temperature precisely and predicting temperature distribution. For that reason, the on about precise temperature measurement has been continuing. Among various methods of measuring temperature, TDLAS(Tunable Diode Laser Absorption Spectroscopy), which is an optical method using a laser, is attracting attention. TDLAS method is good to use due to contactless measurement, fast response time, high precision and good durability in larger combustion system. TDLAS method can measure the temperature as analyzing of optical absorption signals of water vapor using a DFB(Distributed feedback) laser. Water vapor has optically strong absorption signals on 1.3 ㎛ to 1.4 ㎛, and it can be used in a large combustion system which requires temperature division analysis method. In this paper, various laser wavelengths and absorption signals were used to attempt temperature division analysis.
‘상황주의자 인터내셔널Internationale situationniste’의 복원
박미연(Miyeon Park) 현대미술사학회 2014 현대미술사연구 Vol.0 No.35
This study tries to consider the art concept of I.S. as an object of research in art history. To this end, this study attempts to analyse carefully the twelve bulletins named as ‘Internationale situaionniste’, which were published from 1958 to 1969 in France. I.S. has been discussed in relation to post-modern discourses and subculture theory in art history. But, this study exposes that this general thinking that post-modern discourses and sub-cultural theory got a theoretical nourishing from I.S.’theory is a mere misunderstanding, which was formed as a result of unfounded inference and of hasty generalization. This study aims at proposing an integrated concept that is ‘art-politics’ of I.S. by revealing that art and politics are not incompatible elements but the only goal of the revolution for IS. Specifically, this study proposes I.S.’ thinking about art as a practice, through analysing concepts of ‘situation’, ‘situationist’ and ‘international’. In this process, this study illuminates that situationists claimed ‘all-out anti-formalism’ through art as practice, art as process and anonymous artists group while criticizing capitalist commodification and fetishism of art objects and mythicization of artists in capitalist art system. In addition, this study observes a strategical meaning of art-politics in I.S. through ‘detournement’ and ‘derive’ which were not only aesthetic techniques but also political strategies. Through this, this study emphasizes intention of I.S. that was to overcome the failure of the previous avant-garde and to propose a vision as a new avant-garde by modifying the goal of the avant-garde from ‘integration of life and art’ to ‘realization of art politics through practice in everyday life’. This study is a project for recontructing of I.S. who claimed the possibility of an integrated avant-garde by reconsidering the history of avant garde which were separated in art and politics.