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Baeg, Kang‐,Jun,Khim, Dongyoon,Jung, Soon‐,Won,Kang, Minji,You, In‐,Kyu,Kim, Dong‐,Yu,Facchetti, Antonio,Noh, Yong‐,Young WILEY‐VCH Verlag 2012 Advanced Materials Vol.24 No.40
<P>On page 5433, Yong‐Young Noh, Antonio Facchetti, Kang‐Jun Baeg, and co‐workers report that high performance ambipolar complementary inverters and ring oscillators are provided by a remarkable enhancement of both hole injection and transport for n‐channel dominant N2200 OFETs. The significant enhancement of hole mobility in N2200 OTFTs is attributed to the strong dipoles in fluorinated high‐k gate dielectric blend of P(VDF‐TrFE):PMMA. </P>
Outcome of nonsurgical retreatment and endodontic microsurgery: a meta-analysis.
Kang, Minji,In Jung, Hoi,Song, Minju,Kim, Sue Youn,Kim, Hyeon-Cheol,Kim, Euiseong Springer 2015 Clinical oral investigations Vol.19 No.3
<P>The purpose of this study was to evaluate and compare the clinical and radiographic outcomes of nonsurgical endodontic retreatment and endodontic microsurgery by a meta-analysis.</P>
Kang, Minji,Hwang, Hansu,Park, Won-Tae,Khim, Dongyoon,Yeo, Jun-Seok,Kim, Yunseul,Kim, Yeon-Ju,Noh, Yong-Young,Kim, Dong-Yu American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.3
<P>We report on the fabrication of an organic thin-film semiconductor formed using a blend solution of soluble ambipolar small molecules and an insulating polymer binder that exhibits vertical phase separation and uniform film formation. The semiconductor thin films are produced in a single step from a mixture containing a small molecular semiconductor, namely, quinoidal biselenophene (QBS), and a binder polymer, namely, poly(2-vinylnaphthalene) (PVN). Organic field-effect transistors (OFETs) based on QBS/PVN blend semiconductor are then assembled using top-gate/bottom-contact device configuration, which achieve almost four times higher mobility than the neat QBS semiconductor. Depth profile via secondary ion mass spectrometry and atomic force microscopy images indicate that the QBS domains in the films made from the blend are evenly distributed with a smooth morphology at the bottom of the PVN layer. Bias stress test and variable-temperature measurements on QBS-based OFETs reveal that the QBS/PVN blend semiconductor remarkably reduces the number of trap sites at the gate dielectric/semiconductor interface and the activation energy in the transistor channel. This work provides a one-step solution processing technique, which makes use of soluble ambipolar small molecules to form a thin-film semiconductor for application in high-performance OFETs.</P>
Kang, Minji,Kim, Yeong-A.,Yun, Jin-Mun,Khim, Dongyoon,Kim, Jihong,Noh, Yong-Young,Baeg, Kang-Jun,Kim, Dong-Yu The Royal Society of Chemistry 2014 Nanoscale Vol.6 No.21
<P>In this study, we investigated chemically exfoliated two-dimensional (2-D) nanoflakes of molybdenum disulfide (MoS2) as charge-storing elements for use in organic multilevel memory devices (of the printed/flexible non-volatile type) based on organic field-effect transistors (OFETs) containing poly(3-hexylthiophene) (P3HT). The metallic MoS2 nanoflakes were exfoliated in 2-methoxyethanol by the lithium intercalation method and were deposited as nano-floating gates between polystyrene and poly(methyl methacrylate), used as bilayered gate dielectrics, by a simple spin-coating and low temperature (<150 C) process. In the developed OFET memory devices, electrons could be trapped/detrapped in the MoS2 nano-floating gates by modulating the charge carrier density in the active channel through gate bias control. Optimal memory characteristics were achieved by controlling the thickness and concentration of few-layered MoS2 nanoflakes, and the best device showed reliable non-volatile memory properties: a sufficient memory window of 23 V, programming-reading-erasing cycling endurance of >10(2) times, and most importantly, quasi-permanent charge-storing characteristics, i.e., a very long retention time (longer than the technological requirement of commercial memory devices (>10 years)). In addition, we successfully developed multilevel memory cells (2 bits per cell) by controlling the gate bias magnitude.</P>
Kang, Minji,Baeg, Kang‐,Jun,Khim, Dongyoon,Noh, Yong‐,Young,Kim, Dong‐,Yu WILEY‐VCH Verlag 2013 Advanced Functional Materials Vol.23 No.28
<P><B>Abstract</B></P><P>The effects of using a blocking dielectric layer and metal nanoparticles (NPs) as charge‐trapping sites on the characteristics of organic nano‐floating‐gate memory (NFGM) devices are investigated. High‐performance NFGM devices are fabricated using the n‐type polymer semiconductor, poly{[<I>N</I>,<I>N</I>′‐bis(2‐octyldodecyl)‐naphthalene‐1,4,5,8‐bis(dicarboximide)‐2,6‐diyl]‐alt‐5,5′‐(2,2′‐bithiophene)} (P(NDI2OD‐T2)), and various metal NPs. These NPs are embedded within bilayers of various polymer dielectrics (polystyrene (PS)/poly(4‐vinyl phenol) (PVP) and PS/poly(methyl methacrylate) (PMMA)). The P(NDI2OD‐T2) organic field‐effect transistor (OFET)‐based NFGM devices exhibit high electron mobilities (0.4–0.5 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP>) and reliable non‐volatile memory characteristics, which include a wide memory window (≈52 V), a high on/off‐current ratio (<I>I</I><SUB>on</SUB>/<I>I</I><SUB>off</SUB> ≈ 10<SUP>5</SUP>), and a long extrapolated retention time (>10<SUP>7</SUP> s), depending on the choice of the blocking dielectric (PVP or PMMA) and the metal (Au, Ag, Cu, or Al) NPs. The best memory characteristics are achieved in the ones fabricated using PMMA and Au or Ag NPs. The NFGM devices with PMMA and spatially well‐distributed Cu NPs show quasi‐permanent retention characteristics. An inkjet‐printed flexible P(NDI2OD‐T2) 256‐bit transistor memory array (16 × 16 transistors) with Au‐NPs on a polyethylene naphthalate substrate is also fabricated. These memory devices in array exhibit a high <I>I</I><SUB>on</SUB>/<I>I</I><SUB>off</SUB> (≈10<SUP>4 ± 0.85</SUP>), wide memory window (≈43.5 V ± 8.3 V), and a high degree of reliability.</P>
Kang, Minji,Park, Song-Yi,Boushey, Carol J.,Wilkens, Lynne R.,Monroe, Kristine R.,Le Marchand, Loï,c,Kolonel, Laurence N.,Murphy, Suzanne P.,Paik, Hee-Young Elsevier 2018 Journal of the Academy of Nutrition and Dietetics Vol.118 No.9
<P><B>Abstract</B></P> <P><B>Background</B></P> <P>Accounting for sex differences in food portions may improve dietary measurement; however, this factor has not been well examined.</P> <P><B>Objective</B></P> <P>The aim of this study was to examine sex differences in reported food portions from 24-hour dietary recalls (24HDRs) among those who selected the same portion size category on a quantitative food frequency questionnaire (QFFQ).</P> <P><B>Design</B></P> <P>This study was conducted with a cross-sectional design.</P> <P><B>Participants/setting</B></P> <P>Participants (n=319) were members of the Hawaii–Los Angeles Multiethnic Cohort who completed three 24HDRs and a QFFQ in a calibration study conducted in 2010 and 2011.</P> <P><B>Main outcome measures</B></P> <P>Portions of individual foods reported from 24HDRs served as the outcome measures.</P> <P><B>Statistical analyses performed</B></P> <P>Mean food portions from 24HDRs were compared between men and women who reported the same portion size on the QFFQ, after adjustment for race/ethnicity using a linear regression model. Actual amount and the assigned amount of the selected portion size in the QFFQ were compared using one-sample <I>t</I> test for men and women separately.</P> <P><B>Results</B></P> <P>Of 163 food items with portion size options listed in the QFFQ, 32 were reported in 24HDRs by ≥20 men and ≥20 women who selected the same portion size in the QFFQ. Although they chose the same portion size on the QFFQ, mean intake amounts from 24HDRs were significantly higher for men than for women for “beef/lamb/veal,” “white rice,” “brown/wild rice,” “lettuce/tossed salad,” “eggs cooked/raw,” “whole wheat/rye bread,” “buns/rolls,” and “mayonnaise in sandwiches.” For men, mean portions of 14 items from the 24HDRs were significantly different from the assigned amounts for QFFQ items (seven higher and seven lower), whereas for women, mean portions of 14 items were significantly lower from the assigned amounts (with five significantly higher).</P> <P><B>Conclusions</B></P> <P>These sex differences in reported 24HDR food portions—even among participants who selected the same portion size on the QFFQ—suggest that the use of methods that account for differences in the portions consumed by men and women when QFFQs are quantified may provide more accurate absolute dietary intakes.</P>
Comparison of Immune Responses between Smooth and Rough Variant of Mycobacterium Mucogenicum
( Minji Kang ),( Ho Won Kim ),( A-reum Yu ),( Jeong Seong Yang ),( Hyeonji Kim ),( Seung Heon Lee ),( Jong-seok Kim ),( Jake Whang ) 대한결핵 및 호흡기학회 2020 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.128 No.-
Background Mycobacterium mucogenicum (Mmuc), a rapidly growing nontuberculous mycobacterium (NTM), is a rarely causative agent of clinical diseases such as post-traumatic wound infections and catheter-related sepsis in immunocompromised patients. Especially, Mmuc has been identified as a water contaminant in the hospital because it was more resistant to chlorine than other bacteria including M. fortuitum as well as E. coli. Like other NTM species mycobacteria such as M. abscessus, Mmuc has a characteristic to exhibit colony morphologies of rough (R) and variable smooth (S) types. It is known that R type is associated with more severe and persistent infection than S type. However, little is known about the immune responses of Mmuc. Methods To compare the immune responses between S and R type of Mmuc, S types including ATCC 49650 and two clinical strains, and one clinical strain with R type were obtained from the Korean Mycobacteria Resource Center (KMRC) of Korean Institute of Tuberculosis. Therefore, each type of Mmuc were infected to murine bone marrow-derived macrophage (BMDM), then intra-macrophage growth of Mmuc were measured by time dependently. Lastly, we conducted the ELISA of inflammatory cytokine secretion and then confirmed cell death pattern by FACS analysis. Results Macrophages infected with R strain had the higher numbers of intracellular bacteria after 3 days post-infection than S strains. Also, the R strain induced higher levels of cytokine production such as TNF-α, IL-6 and derived more necrotic cell death of BMDM. Conclusions In Conclusion, these Results suggest that R strain has more virulence and induces stronger immune response than S strains likewise other NTM species, MAC and M. abscessus. It is meaningful as the first finding about differential immune responses of Mmuc, also it might provide a fundamental research for further studies on Mmuc pathogenesis.
Establishment of an Agrobacterium-mediated Inoculation System for Cucumber Green Mottle Mosaic Virus
Kang, Minji,Seo, Jang-Kyun,Song, Dami,Choi, Hong-Soo,Kim, Kook-Hyung The Korean Society of Plant Pathology 2015 Plant Pathology Journal Vol.31 No.4
The infectious full-length cDNA clones of Cucumber green mottle mosaic virus (CGMMV) isolates KW and KOM, which were isolated from watermelon and oriental melon, respectively, were constructed under the control of the cauliflower mosaic virus 35S promoter. We successfully inoculated Nicotiana benthamiana with the cloned CGMMV isolates KW and KOM by Agrobacterium-mediated infiltration. Virulence and symptomatic characteristics of the cloned CGMMV isolates KW and KOM were tested on several indicator plants. No obvious differences between two cloned isolates in disease development were observed on the tested indicator plants. We also determined full genome sequences of the cloned CGMMV isolates KW and KOM. Sequence comparison revealed that only four amino acids (at positions 228, 699, 1212, and 1238 of the replicase protein region) differ between the cloned isolates KW and KOM. A previous study reported that the isolate KOM could not infect Chenopodium amaranticolor, but the cloned KOM induced chlorotic spots on the inoculated leaves. When compared with the previously reported sequence of the original KOM isolate, the cloned KOM contained one amino acid mutation (Ala to Thr) at position 228 of the replicase protein, suggesting that this mutation might be responsible for induction of chlorotic spots on the inoculated leaves of C. amaranticolor.