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Cha, Seung I.,Kim, Yuhyun,Hwang, Kyu Hyeon,Shin, Yun-Ji,Seo, Seon Hee,Lee, Dong Yoon The Royal Society of Chemistry 2012 ENERGY AND ENVIRONMENTAL SCIENCE Vol.5 No.3
<P>Dye-sensitized solar cells (DSSCs) are considered a suitable photovoltaic system for urban applications and highly bendable DSSCs can be expanded to applications such as dispensable DSSCs for commercial advertising and small portable power sources. However, although many reports have shown flexible or highly bendable photoelectrodes using TCO-coated polymeric substrates or metal meshes, until now, few have shown highly bendable DSSCs using electrodes because the flexibility of a single electrode is not a critical issue for highly bendable DSSCs. Here, we report a new DSSC design, inspired by the traditional Korean door structure consisting of a paper-bonded wooden frame, and a process for TCO-free highly bendable DSSCs utilizing glass paper and metal mesh. In the new DSSC design, constituents such as stainless steel mesh and mesoporous TiO<SUB>2</SUB> loaded with a Ru-complex dye were bonded on the glass paper, which was sputter-coated with Pt on one side and filled with electrolyte. The glass-paper-based flexible DSSCs showed 2% energy-conversion efficiency, which was maintained under bending until the radius of curvature reached 2 cm. The new glass-paper-based flexible DSSCs may have potential applications as low-cost highly bendable solar cells to overcome the limitations of conventional sandwich-type DSSCs.</P> <P>Graphic Abstract</P><P>New TCO free, highly bendable dye-sensitized solar cells (DSSCs) are designed by utilizing glass paper inspired from Korean traditional door structures. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2ee03096a'> </P>
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The effect of engineered PLGA nanoparticles on nitrifying bacteria in the soil environment
Susmita Das Nishu,Seungbin Park,Yuhyun Ji,Il Han,Jaehong Key,Tae Kwon Lee 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.84 No.-
As a result of their biodegradability and biocompatibility, various nanoparticles using poly(lactic-coglycolicacid) (PLGA) as a copolymer have shown promising results in biomedical engineeringfields,including molecular imaging and drug delivery. However, the potential nanotoxicity of PLGA-basednanoparticles in the environment was poorly understood. Measurement of bacterial nitrificationactivities and changes in the soil microbial community are both critical parameters that should be used toevaluate potential distrurbances in the functioning of the environmental ecosystem. This study aimed toinvestigate the impact of PLGA nanoparticles with different zeta-potentials on nitrifying bacterialcommunities in the soil environment. In pure culture studies, the ammonia oxidation was inhibited byhigher than 50% when PLGA cocentration is more than 0.05 mg/L or more regardless of zeta potential andexposure time, but the negligible effects were observed on the nitrite oxidation by most conditions. In thesoil microcosm experiment, at the 0.05 concentration of the oparticles, the ammonia and nitriteoxidation were inhibited by more than 50% on thefirst day regardless of the nanoparticle composition,but all the activity was recovered after 14 days. These results provide a fundamental information on thetoxcity of PLGA nanparticles on ecologcial function.
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안재호(Ahn, Jaeho),김유현(Kim, Yuhyun),남민아(Nam, Mina),지현준(Ji, Hyeonjun) 한국고고학회 2021 한국고고학보 Vol.- No.121
송국리문화는 수전농경을 수반한 외래계 문물(독립동지주건물, 저장혈, 토기가마, 옹관묘, 송국리식토기, 타날기법, 중국식 저부, 石錘)과 토착계 문물(송국리유형주거지, 석관묘, 유구석부, 유경식석검, 삼각형석도 등) 이 융합한 산물이다. 기원전 10~5세기에 걸쳐 호서해안지역을 시작하여 주변으로 확산되었다. 본 연구는 송국리문화의 문물을 통하여 송국리유형주거지가 조영된 취락의 문화지수를 산출하고, 시군단위의 평균치로써 송국리문화지수 등고선을 작성하였다. 그 결과 등고선 형태로써 7개의 지역권과 등고의고저를 통하여 문화전파의 루트를 찾을 수 있었다. 문화의 확산은 해안루트와 내륙루트가 있으며, 내륙루트는 각 권역 내에서의 전파이고, 해안루트는 중서부지역에서 전남서부권과 남강유역권으로의 전파가 중심이다. 여기에서 다시 제주권과 여수권으로 2차 해상전파가 이루어진다. 내륙루트도 중서부지역권에서 김천-거창권으로 다시 대구권으로 전파된다. 그리고 유적의 분포로써 다수의 취락공동체를 묶고 문화지수를 위계화하여 상・하위취락의 사회망을 검토하였으나, 중서부지역권을 제외한 주변지역에서는 상관성이 드러나지 않았다. The Songguk-ri culture can be characterized as the product of the convergence of foreign and local paddy-field agricultural communities, the former represented by shrines, storage pits, earthenware kilns, jar burials, Songguk-ri style pottery, the forming of vessels using the beating technique, Chinese-style vessel bases, and stone weights, and the latter by Songguk-ri style dwellings, stone coffin burials, grooved adzes, tanged daggers, and triangular harvesting stone knives. Throughout the period from the 10th to 5th century BCE, the Songguk-ri culture spread from the coastal areas of the Hoseo region to nearby areas. This paper presents the results of research in which a ‘Songguk-ri culture index’ was developed for on settlements featuring Songguk-ri style dwellings and contour map was drawn, based on the average value of the index for each local administrative district. Based on this approach, seven areas could be distinguished and differences in the heights of their contours was used to infer the routes through which Songguk-ri culture spread. The Songguk-ri culture took place via both coastal routes and inland routes. While the spread of this culture through inland routes was restricted to a regional scale, coastal routes facilitated the spread of this culture from the southern regions of South Jeolla Province to the Nam River region, and the subsequent secondary spread to Jeju and Yeosu. The inland routes facilitated the spread from the mid-western region to the Gimcheon-Geochang region, and then again to Daegu. Within each regional unit, different settlements were grouped together according to the distributions of artifacts in each region, and the settlement web was defined in accordance with the cultural index hierarchy of communities.
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전하가 다른 PLGA 나노 입자의 생체 안정성 및 암세포에 미치는 영향
김인우,박승빈,지유현,박상효,기재홍,Kim, Inwoo,Park, Seungbin,Ji, Yuhyun,Park, Sanghyo,Key, Jaehong 대한의용생체공학회 2018 의공학회지 Vol.39 No.3
Cancer is a major burden of human disease worldwide. Current chemotherapy has severe side effects because the drugs affect whole body nonspecifically. In addition, the drugs to reach cancer cells are very limited. Over the last two decades, Drug Delivery System (DDS) using nanoparticles has suggested promising results to improve current limitations. In this study, we prepared PLGA nanoparticles with different charge properties and observed their stability and internalization effect to cancer cells. Results using Dynamic Light Scattering (DLS) and Fourier Transform Infrared Spectroscopy (FTIR) confirmed the size and chemical composition of the nanoparticles. The stability of the nanoparticles in pH buffers were variable depending on charge properties. The nanoparticles showed different cytotoxicity and internalization effects to MCF-7 human breast cancer cells. In conclusion, we demonstrated the importance of delicately engineered nanoparticles for better DDS in cancer.
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