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Hyein Ha,Jinhwi Cho,Ja Yeon Lee,Buyong Yun,Jihoon Lee,Min Chul Suh 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.87 No.-
A series of new asymmetric anthracene derivatives have been successfully synthesized for use in the lightemitting layer of solution processed bluefluorescent organic light emitting diodes (OLEDs), which couldbe used both as host and dopant. Especially, new synthetic bluefluorescent materials with anthracenemoieties without any alkyl chains showed high solubility in common organic solvents probably due totheir severely twisted internal structures. They also show moderately high thermal stability due to theirrigid internal core units. With those novel soluble bluefluorescent materials, we created moderatelyefficient solution-processedfluorescent OLEDs. And a new anthracene derivative [9-(9,10-di(naphthalen-2-yl)anthracen-2-yl)-9H-carbazole (DN-2-CzA)] as a host material exhibited moderately high efficiencyand external quantum efficiency of up to 3.2 cd/A and 1.6%, respectively, when we utilized 4,40-bis[4-(diphenylamino)styryl]biphenyl as a dopant. Meanwhile, the [N-(naphthalen-1-yl)-9,10-di(naphthalen-2-yl)-N-phenylanthra-cen-2-amine (DN-2-NPAA)] as a dopant material showed pretty good deviceperformance, up to 5.2 cd/A and 2.2% (EQE), when we utilized 2-tert-butyl-9,10-di(naphth-2-yl)anthracene as a host.
Transparent, Low-Electric-Resistance Nanocomposites of Self-Assembled Block Copolymers and SWNTs
Sung, Jinwoo,Jo, Pil Sung,Shin, Hyein,Huh, June,Min, Byung Gil,Kim, Dong Ha,Park, Cheolmin WILEY-VCH Verlag 2008 Advanced Materials Vol.20 No.8
<B>Graphic Abstract</B> <P>A transparent PS-b-P4VP copolymer/SWNTs nanocomposite film is used as both source and drain electrode in a pentacene OTFT with transmittance and electricresistance values of 85% and 6000 Ω/□, respectively. The low electric resistance of the film is achieved by the selective doping of HAuCl<SUB>4</SUB> in P4VP cores of the self-assembled block copolymer micelles, which simultaneously provides sufficientstability for the SWNTs suspension. <img src='wiley_img/09359648-2008-20-8-ADMA200701535-content.gif' alt='wiley_img/09359648-2008-20-8-ADMA200701535-content'> </P>
Seungjun Lee,Hyun Kyoung Shon,Hyein Ha,Ja Yeon Lee,Min Chul Suh,Tae Geol Lee,Yongsup Park 한국진공학회 2021 한국진공학회 학술발표회초록집 Vol.2021 No.2
Solution processing of organic light-emitting diodes (OLEDs) layers has recently been studied as the next-generation manufacturing process of OLEDs. However, the device lifetime of solution-processed OLEDs is still inferior to compete with vacuum-deposited OLEDs. To understand a fundamental degradation mechanism of thermally annealed solution-processed OLEDs, we investigated depth profiles of organic layers in degraded solution-processed OLEDs by using X-ray photoelectron spectroscopy and time-of-flight secondary mass spectroscopy with argon gas cluster ion beam sputtering.
Pyloric Gland Adenoma in Lynch Syndrome
Lee, Seung Eun,Kang, So Young,Cho, Junhun,Lee, Boram,Chang, Dong Kyung,Woo, Hyein,Kim, Jong Won,Park, Ha Young,Do, In Gu,Kim, Young Eun,Kushima, Ryoji,Lauwers, Gregory Y.,Park, Cheol Keun,Kim, Kyoung Raven Press 2014 The American journal of surgical pathology Vol.38 No.6
<P>The prevalence of gastric cancer associated with Lynch syndrome (LS) is highly variable, and the underlying histologic pathway or molecular mechanisms remain unclear. From 1995 to 2012, 15 patients had been treated for both gastric and colonic adenocarcinomas and diagnosed as LS. In all cases, pathologic review, immunohistochemical analysis for mismatch-repair proteins, and microsatellite instability (MSI) tests were performed. To confirm LS, germline mutation tests and multiplex ligation-dependent probe amplification were performed. All gastric and colonic carcinomas were MSI-high and lost expressions of MLH1/PMS2 in 11 (73%) cases and MSH2/MSH6 in 4 (27%) cases. Remarkably, in a patient with LS and germline mutation of <I>MLH1</I> gene, pyloric gland adenoma (PGA) transformed to adenocarcinoma during follow-up. In 2 additional cases, PGA was found adjacent to advanced gastric cancers. All PGAs in LS patients were MSI-high and lost expression of mismatch-repair proteins (MLH1/PMS2 in 2 cases and MSH2/MSH6 in 1 case), whereas none of the 14 sporadic PGAs was MSI-high or had lost expression of mismatch-repair proteins. On the basis of these observations, although very rare, we suggest the possibility that PGA may be a precursor lesion to gastric adenocarcinoma in LS and that the mismatch-repair deficient pathway of carcinogenesis is involved early in the gastric carcinogenesis pathway.</P>
Lee, Sang Wook,Ryu, Chae-Min,Shin, Jung-Hyun,Choi, Daeheon,Kim, Aram,Yu, Hwan Yeul,Han, Ju-Young,Lee, Hye-Yeon,Lim, Jisun,Kim, Yong Hwan,Heo, Jinbeom,Lee, Seungun,Ju, Hyein,Kim, Sujin,Hong, Ki-Sung,Ha Korean Continence Society 2018 International Neurourology Journal Vol.22 No.S1
<P><B>Purpose</B></P><P>To evaluate the therapeutic effect of human embryonic stem cell (hESC)-derived multipotent mesenchymal stem cells (M-MSCs) on ketamine-induced cystitis (KC) in rats.</P><P><B>Methods</B></P><P>To induce KC, 10-week-old female rats were injected with 25-mg/kg ketamine hydrochloride twice weekly for 12 weeks. In the sham group, phosphate buffered saline (PBS) was injected instead of ketamine. One week after the final injection of ketamine, the indicated doses (0.25, 0.5, and 1×10<SUP>6</SUP> cells) of M-MSCs (KC+M-MSC group) or PBS vehicle (KC group) were directly injected into the bladder wall. One week after M-MSC injection, the therapeutic outcomes were evaluated via cystometry, histological analyses, and measurement of gene expression. Next, we compared the efficacy of M-MSCs at a low dose (1×10<SUP>5</SUP> cells) to that of an identical dose of adult bone marrow (BM)-derived MSCs.</P><P><B>Results</B></P><P>Rats in the KC group exhibited increased voiding frequency and reduced bladder capacity compared to rats of the sham group. However, these parameters recovered after transplantation of M-MSCs at all doses tested. KC bladders exhibited markedly increased mast cell infiltration, apoptosis, and tissue fibrosis. Administration of M-MSCs significantly reversed these characteristic histological alterations. Gene expression analyses indicated that several genes associated with tissue fibrosis were markedly upregulated in KC bladders. However the expression of these genes was significantly suppressed by the administration of M-MSCs. Importantly, M-MSCs ameliorated bladder deterioration in KC rats after injection of a low dose (1×10<SUP>5</SUP>) of cells, at which point BM-derived MSCs did not substantially improve bladder function.</P><P><B>Conclusions</B></P><P>This study demonstrates for the first time the therapeutic efficacy of hESC-derived M-MSCs on KC in rats. M-MSCs restored bladder function more effectively than did BM-derived MSCs, protecting against abnormal changes including mast cell infiltration, apoptosis and fibrotic damage.</P>