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전도성 고분자의 전기전도도 향상 연구 및 이를 이용한 투명전극 응용
임소은 ( Soeun Im ),김소연 ( Soyeon Kim ),김세열 ( Seyul Kim ),김선주 ( Felix Sunjoo Kim ),김중현 ( Jung Hyun Kim ) 한국공업화학회 2015 공업화학 Vol.26 No.6
투명 전극의 응용분야가 확대되고 시장의 규모가 커짐에 따라 기존 투명 전극 재료인 ITO (Indium Tin Oxide)를 대체할 차세대 투명전극의 개발에 관심이 집중되고 있다. 다양한 후보군 중에서도 대표적인 전도성 고분자인 PEDOT : PSS [poly(3,4-ethylenedioxythiophene) : poly(styrene sulfonate)]는 기계적 유연성을 갖고 있으면서도 소재와 공정 상의가격 경쟁력이 크기 때문에 미래 소자 구현을 위한 투명전극 재료로 주목을 받고 있으며, 현재 PEDOT : PSS의 전기전도도 수준을 ITO나 금속의 수준으로 향상시키기 위해 다양한 화학적/물리적 처리를 통한 기능성 향상에 많은 연구가진행 중이다. 본 총설에서는 전도성 고분자의 전기 전도도를 향상시키기 위한 다양한 공정 기술에 대한 연구 현황을짚어보고자 한다. 대표적으로 유기용매, 이온성 액체, 계면활성제 등과 같은 첨가제와 박막에 대한 산 처리 공정, 물리적 인장을 통한 전기전도도 향상 연구를 들 수 있다. 또한 이러한 공정을 적용하여 전도성 고분자 투명 전극을 전자및 에너지 소자에 응용한 사례도 간략히 소개하고자 한다. As the need for next-generation flexible electronics grows, novel materials and technologies that can replace conventional indium tin oxide (ITO) for transparent electrodes have been of great interest. Among them, a conducting polymer, especially poly(3,4-ethylenedioxythiophene) : poly(styrene sulfonate) (PEDOT : PSS) is one of the most promising candidates because it is mechanically flexible, inexpensive, and capable of being processed in solution. Currently, there are a lot of research efforts on enhancing its electrical conductivity to the level of ITO or metal electrodes through chemical and/or physical processing. In this review article, we present various additives and pre-/post-deposition processing methods for improving the electrical conductivity of PEDOT : PSS. Some of representative reports are also introduced, which demonstrated the use of conductivity-enhanced PEDOT : PSS as transparent electrodes in electronics and energy conversion.
Kim Hyae Jin,Jeon Soeun,Lee Hyeon-Jeong,Bae Jaeho,Ri Hyun-Su,홍정민,Paek Sung In,Kwon Seul Ki,Kim Jae-Rin,Park Seungbin,Yun Eun-Jung 대한마취통증의학회 2023 Korean Journal of Anesthesiology Vol.76 No.6
Background: We investigated the effects of sevoflurane exposure on the expression of matrix metalloproteinase (MMP), expression and ablation of natural killer group 2, member D (NKG2D) ligands (UL16-binding proteins 1–3 and major histocompatibility complex class I chain-related molecules A/B), and natural killer (NK) cell-mediated cytotoxicity in breast cancer cells.Methods: Three human breast cancer cell lines (MCF-7, MDA-MB-453, and HCC-70) were incubated with 0 (control), 600 (S6), or 1200 μM (S12) sevoflurane for 4 h. The gene expression of NKG2D ligands and their protein expression on cancer cell surfaces were measured using multiplex polymerase chain reaction (PCR) and flow cytometry, respectively. Protein expression of MMP-1 and -2 and the concentration of soluble NKG2D ligands were analyzed using western blotting and enzyme-linked immunosorbent assays, respectively. Results: Sevoflurane downregulated the mRNA and protein expression of the NKG2D ligand in a dose-dependent manner in MCF-7, MDA-MB-453, and HCC-70 cells but did not affect the expression of MMP-1 or -2 or the concentration of soluble NKG2D ligands in the MCF-7, MDA-MB-453, and HCC-70 cells. Sevoflurane attenuated NK cell-mediated cancer cell lysis in a dose-dependent manner in MCF-7, MDA-MB-453, and HCC-70 cells (P = 0.040, P = 0.040, and P = 0.040, respectively).Conclusions: Our results demonstrate that sevoflurane exposure attenuates NK cell-mediated cytotoxicity in breast cancer cells in a dose-dependent manner. This could be attributed to a sevoflurane-induced decrease in the transcription of NKG2D ligands rather than sevoflurane-induced changes in MMP expression and their proteolytic activity.
Validated Question Generation System Using SMT Solver
Soeun Kim,Geounyong Park,Yeoeun Sim,Dongkyeom Jang,Yunsik Son 한국경영정보학회 2023 한국경영정보학회 학술대회논문집 Vol.2023 No.11
We introduce an automated method for generating data structure questions using the SMT Solver 'Z3'. Recognizing challenges in traditional question-setting, which might contain logical errors or lack originality, we focus on generating logically consistent and diverse questions. We harness Z3's EnumSort() and Const() functions for conceptual question creation. For applied questions, three main approaches were employed: generating data structures with specific constraints, deriving accurate solutions for questions, and assessing data structure integrity pre and post specific code execution. The outcome not only refines problem creation but also provides a quality-assured learning platform. By transitioning our findings to a web service, we envision bridging educational gaps caused by location and financial constraints. This initiative offers a novel perspective in the realm of educational assessments.
Soeun Shin,Sun Ran Cho,Hyun Kyung Kim,Hyun-Na Koo,Gil-Hah Kim 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.10
The green peach aphid, Myzus persicae Sülzer, is an important sap-sucking pest of many plants, including Chinese cabbage. The objective of this study was therefore (1) to determine the effects of sublethal concentrations of afidopyropen, sulfoxaflor, and spirotetramat on adult longevity and the fecundity of M. persicae, and (2) to study the feeding behavior of M. persicae on Chinese cabbage leaves treated with various concentrations of these three insecticides. Longevity and total fecundity of M. persicae adults were decreased at concentrations higher than LC30. Feeding behavior analyses using an electrical penetration graph showed that sublethal concentrations of afidopyropen, sulfoxaflor, and spirotetramat had significant effects on the duration of phloem ingestion.
Effects of Children`s Negative Peer Schema on the Perception Bias of Peer Relationships
Soeun Park,Chang Dai Kim,Yoon Kyung Shim,Soo Im Kim 한국상담학회 2011 Journal of Asia Pacific counseling Vol.1 No.2
Focusing on the idea that victims of bullying may have cognitive/behavioral factors that could trigger exclusion from others, this study has conducted two experiments regarding peer representations. In Study 1, 93 boys and girls in Grade 5 performed Missing Interpersonal Relations – Pair Task and Perception of Interpersonal Relationship Questionnaire, and the results demonstrated that children with negative peer representations viewed their own interpersonal relationships more negatively. In Study 2, a separate group of 118 boys and girls in Grade 5 performed Interpersonal Relations (none missing) – Pair Task and Perception of Interpersonal Relationship Questionnaire, and the results demonstrated that children with negative peer representations view interpersonal relationships between others more positively. The findings suggest that effective interventions are crucial for victimized children. With the possibility of children victim’s perception bias actually bringing about the victimization, counseling intervention to modify such perception bias seems necessary.
Striped fullerene patterns constructed in elastically anisotropic cholesteric liquid crystals
Kim, Soeun,Kang, Shin-Woong,Jeong, Kwang-Un The Royal Society of Chemistry 2012 Soft matter Vol.8 No.38
<P>A fullerene-based reactive molecule (C60RM) was newly synthesized. Its chemical structure and phase behaviour were investigated using spectroscopic, scattering and microscopic techniques. Furthermore, the striped C60RM pattern was successfully fabricated in an elastically anisotropic cholesteric liquid crystal (CLC).</P> <P>Graphic Abstract</P><P>Striped fullerene patterns were successfully fabricated in an elastically anisotropic cholesteric LC medium. This unique templating effect for constructing the macroscopic patterns with nano-building blocks can open new doors for the next generation of nanotechnology. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2sm26420j'> </P>