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Jeon, Junho,Kannan, Kurunthachalam,Lim, Byung J.,An, Kwang Guk,Kim, Sang Don Royal Society of Chemistry 2011 Journal of environmental monitoring Vol.13 No.6
<P>The influence of salinity and organic matter on the distribution coefficient (<I>K</I><SUB>d</SUB>) for perfluorooctane sulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) in a brackish water–clay system was studied. The distribution coefficients (<I>K</I><SUB>d</SUB>) for PFAs onto inorganic clay surfaces increased with salinity, providing evidence for electrostatic interaction for the sorption of PFAs, whereas the relationship between <I>K</I><SUB>d</SUB> and organic carbon content (<I>f</I><SUB>oc</SUB>) suggested that hydrophobic interaction is the primary driving force for the sorption of PFAs onto organic matter. The organic carbon normalized adsorption coefficient (<I>K</I><SUB>oc</SUB>) of PFAs can be slightly overestimated due to the electrostatic interaction within uncoated inorganic surfaces. In addition, the dissolved organic matter released from coated clay particles seemed to solvate PFA molecules in solution, which contributed to a decrease in <I>K</I><SUB>d</SUB>. A positive relationship between <I>K</I><SUB>d</SUB> and salinity was apparent, but an empirical relationship for the ‘salting-out’ effect was not evident. The <I>K</I><SUB>d</SUB> values of PFAs are relatively small compared with those reported for persistent organic pollutants. Thus, sorption may not be a significant route of mass transfer of PFAs from water columns in estuarine environments. However, enhancement of sorption of PFAs to particulate matter at high salinity values could evoke potential risks to benthic organisms in estuarine areas.</P> <P>Graphic Abstract</P><P>This study was initiated to provide insight into fate (<I>e.g.</I>, sorption to clay particles) of perfluoroalkyl acids (PFAs), <I>i.e.</I> perfluorooctane sulfate (PFOS) and perfluorooctanic acid (PFOA), in estuarine environments where salinity and organic matter play crucial roles as environmental factors. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0em00791a'> </P>
Role of food and clay particles in toxicity of copper and diazinon using <i>Daphnia magna</i>
Jeon, Junho,Sung Ra, Jin,Hong Lee, Sun,Lee, Myun J.,Yu, Seung H.,Don Kim, Sang Elsevier 2010 Ecotoxicology and environmental safety Vol.73 No.3
<P><B>Abstract</B></P><P>Toxicity changes in copper and diazinon were investigated in the presence of food, clay, and their mixture by using <I>Daphnia magna.</I> In sorption equilibrium experiments, copper was significantly attracted (>34% sorbed) to food, clay, and food–clay mixture due to their negative zeta potential, while diazinon was less sorbed (<11%). In the exposure test with food and clay particles, it was revealed that copper was remarkably reduced in the presence of clay particles indicating the change in bioavailability of copper by sorption to clay. This was considered as the primary mechanism for toxicity reduction whereas diazinon toxicity was food dependent in the analysis of toxicity using toxicity change index (TCI). It was also shown that certain foods could not only act as a sorbent to copper and diazinon, but also as a material of energy source to alleviate the toxic damage. Meanwhile, clay can be considered as a prominent sorbent to copper but not to diazinon and can inhibit the sorption interaction between foodstuffs and toxicants through the aggregation and sedimentation processes. Furthermore, clay particles, as shown in TCI analysis, may be a potentially risky material as a physiological stressor or a toxicant carrier in contaminated environments.</P>
Texture map generation for 3D reconstructed scenes
Jeon, Junho,Jung, Yeongyu,Kim, Haejoon,Lee, Seungyong Springer-Verlag 2016 The Visual computer Vol.32 No.6
<P>We present a novel method for generating texture maps for 3D geometric models reconstructed using consumer RGB-D sensors. Our method generates a texture map for a simplified 3D mesh of the reconstructed scene using spatially and temporally sub-sampled key frames of the input RGB stream. We acquire an accurate texture map by optimizing the texture coordinates of the 3D model to maximize the photometric consistency among multiple key frames. We show that the optimization can be performed efficiently using GPU by exploiting the locality of texture coordinate manipulation. Experimental results demonstrate that our method can generate a texture map in a few tens of seconds for a large 3D model, such as a whole room.</P>
고분해능질량분석기 기반의 표적, 추정, 비표적 분석기법을 활용한 수환경 미량오염물질 및 환경변환체 탐색: A review
전준호 ( Junho Jeon ),박나리 ( Naree Park ),이선홍 ( Sun-hong Lee ) 한국환경분석학회 2016 환경분석과 독성보건 Vol.19 No.4
Micropollutants including pharmaceuticals, personal care products, pesticides, etc., and their transformation products (TP) are widely distributed in environmental media. However, limited information on their occurrence and concentration is available, at least partially due to lack of precise, reliable analytical tools. Recently, highly advanced instrument such as high resolution mass spectrometry (HRMS) has been commercially available and applicable for the detection of micropollutants and TPs. In addition, HRMS relevant screening techniques, suspect and nontarget screening, have been developed and optimized to identify unpredictable and unknown pollutants at trace levels. In this review paper, prior micropollutants and their TPs are suggested via literature survey, and the procedure of target/suspect/nontarget screening for their identification are introduced in detail with technical steps. Finally, the applicability of HRMS-based identification methods is discussed with lessons from previous studies. Considering the accuracy and applicability, suspect/nontarget screening approaches with HRMS are expected to extend our knowledge on micropollutants and TPs under the cover.
Pyroprotein-based electronic textiles with high thermal durability
Jeon, Jun Woo,Oh, Joo Young,Cho, Se Youn,Lee, Sungho,Jang, Hyun-Seok,Jung, Won Taek,Kim, Jeong-Gyun,Kim, Hyeonbeom,Kim, Hyuk Jin,Kim, SeongYeon,Han, Songlee,Kim, JunHo,Chang, Young Jun,Suh, Dongseok,J Elsevier 2018 Materials today Vol.21 No.9
<P><B>Abstract</B></P> <P>Electronic textiles (e-textiles) need to have high heat durability for various applications. However, current e-textiles are usually damaged by high-temperature processes. We report silk-based e-textiles fabricated by simple pyrolysis with axial stretching that demonstrate high electrical conductivity and thermal durability. The electrical conductivity of the proposed e-textiles was on the order of 10<SUP>3</SUP>S/cm and the electrical characteristics were maintained even after heating and bending. Furthermore, we prepared e-textiles with various electronic properties, such as semiconducting, superconducting, and light-emitting properties, by depositing ZnO, MoSe<SUB>2</SUB>, and NbN onto the commercial silk-based e-textiles using sputtering and evaporation. We introduced a simple method for fabricating silk-based e-textiles with various electronic properties, which are compatible with the current textile industry.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Jeon, Dong-Hwan,Kim, SeongYeon,Enkhbat, Temujin,Kim, JunHo,Kim, Dae-Hwan,Hwang, Dae-Kue Elsevier 2019 Solar energy materials and solar cells Vol.194 No.-
<P><B>Abstract</B></P> <P>In this study, the application of Sb incorporation for low-temperature (≤ 450 °C) processing of Cu(In,Ga)Se<SUB>2</SUB> (CIGSe) solar cells is explored. At low reaction temperature, most Ga remains at the back of the film adjacent to the Mo back contact. We observed that the incorporated Sb enhanced grain size and improved device performance compared with similarly processed CIGSe films made without Sb. From the energy-dispersive spectroscopy analysis and secondary ion mass spectrometry results, it was determined that elemental Ga accumulation at the back of the reacted film after the two-step selenization process was significantly alleviated owing to Sb incorporation. Significant Sb-induced grain size enhancement was confirmed using cross-sectional scanning electron microscopy. The electronic and optical properties of the Sb incorporated CIGSe films were examined with admittance spectroscopy and fluorescence lifetime imaging techniques.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Electronic and microstructure properties of CIGSe films were studied. </LI> <LI> Enhanced grain growth in CIGSe thin films was observed with Sb. </LI> <LI> Sb diffusion during annealing at low temperature can facilitate Ga mass transfer. </LI> <LI> Sb incorporating in CIGSe thin films increased carrier lifetimes. </LI> <LI> Sb incorporating increases conversion efficiency in CIGSe solar cells. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>