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Lee, Keunsik,Yoon, Yeoheung,Cho, Yunhee,Lee, Sae Mi,Shin, Yonghun,Lee, Hanleem,Lee, Hyoyoung American Chemical Society 2016 ACS NANO Vol.10 No.7
<P>Although there are numerous reports of high performance supercapacitors with porous graphene, there are few reports to control the interlayer gap between graphene sheets with conductive molecular linkers (or molecular pillars) through a pi-conjugated chemical carbon-carbon bond that can maintain high conductivity, which can explain the enhanced capacitive effect of supercapacitor mechanism about accessibility of electrolyte ions. For this, we designed molecularly gap-controlled reduced graphene oxides (rGOs) via diazotization of three different phenyl, biphenyl, and para-terphenyl bis-diazonium salts (BD1-3). The graphene interlayer sub-nanopores of rGO-BD1-3 are 0.49, 0.7, and 0.96 nm, respectively. Surprisingly, the rGO-BD2 0.7 nm gap shows the highest capacitance in 1 M TEABF(4) having 0.68 nm size of cation and 6 M KOH having 0.6 nm size of hydrated cation. The maximum energy density and power density of the rGO-BD2 were 129.67 W h kg(-1) and 30.3 kW kg(-1), respectively, demonstrating clearly that the optimized sub-nanopore of the rGO-BDs corresponding to the electrolyte ion size resulted in the best capacitive performance.</P>
( Young Chang ),( Hyoyoung Lee ),( Junsik Yoon ),( Sunwoong Lee ),( Sung-won Chung ),( Minsuk Lee ),( Yunbin Lee ),( Eun Ju Cho ),( Jeong-hoon Lee ),( Su Jong Yu ),( Yoon Jun Kim ),( Jung-hwan Yoon ) 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1
Aims: Sorafenib treatment is regarded as a first-line chemotherapy in patients with advanced hepatocellular carcinoma (HCC), although most patients are refractory to this drug. In this study, we aimed to establish Sorafenib-resistant HCC cell line and explore various signals involved in cell survival in order to investigate the mechanism of Sorafenib resistance in HCC. Methods: Huh7-Sorafenib resistant (SR) HCC cell line was established by culturing Huh7 HCC cells in increasing doses of Sorafenib. Gene expression, cell proliferation, and protein expression were determined by RT-PCR, MTS assay and Western blot. To identify the role of each signaling involved in Sorafenib resistance, cells were treated with LCL161 (a second mitochondria-derived activator of caspases (Smac) mimetic) and/or lysine demethylase 3A (KDM3A)-specific small interfering RNA (siRNA), or p21-specific siRNA. Results: Huh7-SR cells exhibited lower gene and protein expression of Smac than Huh7 cells. Sorafenib sensitivity of Huh7- SR cells as well as Huh7 cells was increased with LCL161, and the Sorafenib sensitizing effect of LCL161 was more potent in Huh7-SR cells than in Huh7 cells. KDM3A gene expression was higher in Huh7-SR cells than in Huh7 cells. Huh7-SR cells demonstrated improved sensitivity to Sorafenib following siRNA-mediated KDM3A knockdown. Moreover, Sorafenib sensitivity was further increased after KDM3A knockdown in combination with LCL161 treatment. Huh7-SR cells showed increased expression of p21 compared to Huh7 cells. Proliferation of Huh7-SR cells was markedly decreased with Sorafenib treatment after p21 knockdown, although there was no change in the antitumor effect of Sorafenib before and after p21 knockdown in Huh7 cells. Conclusions: Smac, KDM3A and p21 are involved in Sorafenib resistance mechanism in HCCs, which might be new therapeutic targets to overcome Sorafenib resistance.
Lee, Hanleem,Bak, Sora,An, Sung-Jin,Kim, Jung Ho,Yun, Eunbhin,Kim, Meeree,Seo, Sohyeon,Jeong, Mun Seok,Lee, Hyoyoung American Chemical Society 2017 ACS NANO Vol.11 No.12
<P>Thin-film transistors (TFTs) have received great attention for their use in lightweight, large area, and wearable devices. However, low crystalline materials and inhomogeneous film formation limit the realization of high-quality electrical properties for channels in commercial TFTs, especially for flexible electronics. Here, we report a field-effect TFT fabricated <I>via</I> cross-linking of edge-1T basal-2H MoS<SUB>2</SUB> sheets that are prepared by edge functional exfoliation of bulk MoS<SUB>2</SUB> with soft organic exfoliation reagents. For edge functional exfoliation, the electrophilic 4-carboxy-benzenediazonium used as the soft organic reagent attacks the nucleophilic thiolates exposed at the edge of the bulk MoS<SUB>2</SUB> with the help of an amine catalyst, resulting in 1T edge-functional HOOC-benzene-2H basal MoS<SUB>2</SUB> nanosheets (e-MoS<SUB>2</SUB>). The cross-linking <I>via</I> hydrogen bonding of the negatively charged HOOC of the e-MoS<SUB>2</SUB> sheets with the help of a cationic polymer, polydiallyldimethylammonium chloride, results in a good film formation for a channel of the solution processing TFT. The TFT exhibits an extremely high mobility of 170 cm<SUP>2</SUP>/(V s) at 1 V (on/off ratio of 10<SUP>6</SUP>) on SiO<SUB>2</SUB>/Si substrate and also a high mobility of 36.34 cm<SUP>2</SUP>/(V s) (on/off ratio of 10<SUP>3</SUP>) on PDMS/PET substrate.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2017/ancac3.2017.11.issue-12/acsnano.7b07776/production/images/medium/nn-2017-07776m_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn7b07776'>ACS Electronic Supporting Info</A></P>
Lee, Jihye,Jang, Ho Young,Jung, Insub,Yoon, Yeoheung,Jang, Hee-Jeong,Lee, Hyoyoung,Park, Sungho Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.7
Here, we present a facile method to synthesize Pt nanoparticles (NPs) and graphene composite materials (Pt/G) via vacuum filtration. Anodic aluminum oxide (AAO) templates were used to separate Pt/G composite and liquid phase. This method can be used to easily tune the mass ratio of Pt NPs and graphene. Pt NPs, graphene, and carbon nanotubes (CNTs) as building blocks were characterized by a variety of techniques such as scanning electron microscopy, UV-Vis spectroscopy, and Raman spectroscopy. We compared the electrocatalytic activities of Pt/G with Pt NP and CNT films (Pt/CNT) by cyclic voltammetry (CV), CO oxidation, and methanol oxidation. Pt/G was much more stable than pure Pt films. Also, Pt/G had better electrochemical activity, CO tolerance and methanol oxidation than Pt/CNT loaded with the same amount of Pt NPs due to the better dispersion of Pt NPs on graphene flakes without aggregation. We further synthesized Au@Pt disk/G and Pt nanorods/G to determine if our synthetic method can be applied to other NP shapes such as nanodisks and nanorods, for further electrocatalysis studies.
Molecular Monolayer Nonvolatile Memory with Tunable Molecules
Lee, Junghyun,Chang, Hojong,Kim, Sangkwan,Bang, Gyeong Sook,Lee, Hyoyoung WILEY-VCH Verlag 2009 Angewandte Chemie Vol.48 No.45
<B>Graphic Abstract</B> <P>An unforgettable monolayer: Dialkylthiolate-tethered metal complex self-assembled monolayers (see picture; thickness 3 nm) provide stable and reproducible molecular monolayer nonvolatile memory (MMNVM) characterized by its hysteretic current–voltage (I–V) properties and retention time for write–multiple read–erase–multiple read pulse cycles. This is the first known voltage-driven MMNVM using only a molecular monolayer. <img src='wiley_img/14337851-2009-48-45-ANIE200902990-content.gif' alt='wiley_img/14337851-2009-48-45-ANIE200902990-content'> </P>
Hyoyoung LEE Korea Koreanology Association 2024 한류연구 Vol.3 No.1
The present study has investigated and explored the role of Sungkyunkwan during the Joseon Dynasty and implications for modern education in South Korea using numerous literature dataset, such as google Scholar, Scopus, Web of Science. Sungkyunkwan had a significant role in the Joseon dynasty's academic, social and political life. They were known as Sungkyunkwan scholars and were the elite group with a significant controlling influence over the governmental structure. In addition, they influenced policy-making, judiciary, and culture preservation through their understanding and application of Confucianism. More specifically, the Sungkyunkwan graduates were appointed to serve in many administrative capacities in Hanyang and other city provinces, spreading the culture and beliefs of Sungkyunkwan throughout the kingdom. According to the prior study, South Korea faces the issues of modernity; however, the approaches brought by Sungkyunkwan and the concept of education that was adopted still have their relevance. Education in modern Korean society is closely connected with scholars; schools and universities are built to cultivate brilliant individuals with solid morals and values for society. The spirit of Sungkyunkwan, which is about diligence, perseverance, and ethical conduct, is still rooted in the Korean educational system.