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Kim, In-Bok,Khim, Dongyoon,Jang, Soo-Young,Kim, Jihong,Yu, Byung-kwan,Kim, Yeong-A,Kim, Dong-Yu Elsevier 2015 ORGANIC ELECTRONICS Vol.26 No.-
<P><B>Abstract</B></P> <P>Donor–acceptor (D–A) type conjugated polymers have been developed to absorb longer wavelength light in polymer solar cells (PSCs) and to achieve a high charge carrier mobility in organic field-effect transistors (OFETs). PDTDP, containing dithienothiophene (DTT) as the electron donor and diketopyrrolopyrrole (DPP) as the electron acceptor, was synthesized by stille polycondensation in order to achieve the advantages of D–A type conjugated polymers. The polymer showed optical band gaps of 1.44 and 1.42eV in solution and in film, respectively, and a HOMO level of 5.09eV. PDTDP and PC<SUB>71</SUB>BM blends with 1,8-diiodooctane (DIO) exhibited improved performance in PSCs with a power conversion efficiency (PCE) of 4.45% under AM 1.5G irradiation. By investigating transmission electron microscopy (TEM), atomic force microscopy (AFM), and the light intensity dependence of <I>J</I> <SUB>SC</SUB> and <I>V</I> <SUB>OC</SUB>, we conclude that DIO acts as a processing additive that helps to form a nanoscale phase separation between donor and acceptor, resulting in an enhancement of <I>μ</I> <SUB>h</SUB> and <I>μ</I> <SUB>e</SUB>, which affects the <I>J</I> <SUB>SC</SUB>, EQE, and PCE of PSCs. The charge carrier mobilities of PDTDP in OFETs were also investigated at various annealing temperatures and the polymer exhibited the highest hole and electron mobilities of 2.53cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP> at 250°C and 0.36cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP> at 310°C, respectively. XRD and AFM results demonstrated that the thermal annealing temperature had a critical effect on the changes in the crystallinity and morphology of the polymer. The low-voltage device was fabricated using high-<I>k</I> dielectric, P(VDF-TrFE) and P(VDF-TrFE-CTFE), and the carrier mobility of PDTDP was reached 0.1cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP> at <I>V</I> <SUB>d</SUB> =−5V. PDTDP complementary inverters were fabricated, and the high ambipolar characteristics of the polymer resulted in an output voltage gain of more than 25.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We describe the synthesis and characterizations for donor–acceptor copolymer, PDTDP. </LI> <LI> PDTDP shows high crystallinity and appropriate energy levels for ambipolar OFETs. </LI> <LI> We achieved a 4.45% efficiency with processing additive, DIO, in PSCs. </LI> <LI> We achieve ambipolar field effect mobilities, <I>μ</I> <SUB>h</SUB> ∼2.53 and <I>μ</I> <SUB>e</SUB> ∼0.36cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kim, Seong Han,Yang, Seo Yeon,You, Jihong,Lee, Sang Bae,You, Jin,Chang, Yoon Soo,Kim, Hyung Jung,Ahn, Chul Min,Byun, Min Kwang,Park, Hye Jung,Park, Jung-Won The Korean Academy of Tuberculosis and Respiratory 2016 Tuberculosis and Respiratory Diseases Vol.79 No.4
Background: Specific immunoglobulin E (IgE) sensitization to staphylococcal enterotoxin (SE) has been recently considered to be related to allergic disease, including asthma. Despite studies on specific IgE (sIgE) to SE and its relationship to asthma diagnosis and severity, the association of sIgE to SE with airway hyperresponsiveness (AHR) remains unclear. Methods: We enrolled 81 asthma patients admitted to the Severance Hospital in Korea from March 1, 2013, to February 28, 2015 and retrospectively reviewed the electronic medical records of the enrolled subjects. The serum levels of sIgE to SE (A/B) of all subjects was measured using the ImmunoCAP 250 (Phadia) system with SE-sIgE positive defined as >0.10 kU/mL. Results: The SE-sIgE level was not significantly correlated with asthma severity (forced expiratory volume in 1 second [$FEV_1$], $FEV_1$/forced vital capacity, sputum eosinophils, and serum eosinophils), whereas the SE-sIgE level in patients with positive AHR ($mean{\pm}standard$ error of the mean, $0.606{\pm}0.273kU/mL$) was significantly higher than that in patients with negative AHR ($0.062{\pm}0.015kU/mL$, p=0.034). In regression analysis, SE sensitization (sIgE to SE ${\geq}0.010kU/mL$) was a significant risk factor for AHR, after adjustment for age, sex, $FEV_1$, and sputum eosinophils (odds ratio, 7.090; 95% confidence interval, 1.180-42.600; p=0.032). Prevalence of SE sensitization was higher in patients with allergic rhinitis and non-atopic asthma patients, as compared to patients without allergic rhinitis and atopic asthma patients, respectively, but without statistical significance. Conclusion: SE sensitization is significantly associated with AHR.
Zinc-mediated Reversible Multimerization of Hsp31 Enhances the Activity of Holding Chaperone
Kim, Jihong,Choi, Dongwook,Cha, So-Young,Oh, Young-Mee,Hwang, Eunha,Park, Chankyu,Ryu, Kyoung-Seok Elsevier 2018 Journal of molecular biology Vol.430 No.12
<P><B>Abstract</B></P> <P>Hsp31 protein, belonging to the DJ-1/ThiJ/PfpI superfamily, increases the survival of <I>Escherichia coli</I> under various stresses. While it was reported as a holding chaperone, Hsp31 was also shown to exhibit the glyoxalase III activity in subsequent study. Here, we describe our finding that Hsp31 undergoes a Zn<SUP>+2</SUP>-mediated multimerization (HMW<SUB>Zinc</SUB>), resulting in an enhanced chaperone activity. Furthermore, it was shown that the formation of HMW<SUB>Zinc</SUB> is reversible such that the oligomer dissociates into the native dimer by EDTA incubation. We attempted to determine the structural change involving the transition between the native dimer and HMW<SUB>Zinc</SUB> by adding Ni<SUP>+2</SUP>, which is Zn<SUP>+2</SUP>-mimetic, producing a potential intermediate structure. An analysis of this intermediate revealed a structure with hydrophobic interior exposed, due to an unfolding of the N-terminal loop and the C-terminal β-to-α region. A treatment with hydrogen peroxide accelerated HMW<SUB>Zinc</SUB> formation, so that the Hsp31<SUP>C185E</SUP> mutant rendered the formation of HMW<SUB>Zinc</SUB> even at 45 °C. However, the presence of Zn<SUP>+2</SUP> in the catalytic site antagonizes the oxidation of C185, implying a negative role. Our results suggest an unprecedented mechanism of the enhancing chaperone activity by Hsp31, in which the reversible formation of HMW<SUB>Zinc</SUB> occurs in the presence of heat and Zn<SUP>+2</SUP> ion.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hsp31 forms Zn<SUP>+2</SUP>-coordinated multimer (HMW<SUB>Zinc</SUB>) in the presence of heat stress and Zn<SUP>+2</SUP>. </LI> <LI> HMW<SUB>Zinc</SUB> acquires an enhanced chaperone activity and is reversible to native dimer. </LI> <LI> The oxidation of C185 located in the catalytic site accelerates the HMW<SUB>Zinc</SUB> formation. </LI> <LI> The binding of Zn<SUP>+2</SUP> to the catalytic site retardates the oxidation of C185. </LI> </UL> </P> <P><B>Graphical Abstract</B></P> <P>[DISPLAY OMISSION]</P>
Per-deuteration and NMR experiments for the backbone assignment of 62 kDa protein, Hsp31
Kim, Jihong,Choi, Dongwook,Park, Chankyu,Ryu, Kyoung-Seok Korean Magnetic Resonance Society 2015 Journal of the Korean Magnetic Resonance Society Vol.19 No.3
Hsp31 protein is one of the members of DJ-1 superfamily proteins and has a dimeric structure of which molecular weight (MW) is 62 kDa. The mutation of DJ-1 is closely related to early onset of Parkinson's disease. Hsp31 displays $Zn^{+2}$-binding activity and was first reported to be a holding chaperone in E. coli. Its additional glyoxalase III active has recently been characterized. Moreover, an incubation at $60^{\circ}C$ induces Hsp31 protein to form a high MW oligomer (HMW) in vitro, which accomplishes an elevated holding chaperone activity. The NMR technique is elegant method to probe any local or global structural change of a protein in responses to environmental stresses (heat, pH, and metal). Although the presence of the backbone chemical shifts (bbCSs) is a prerequisite for detailed NMR analyses of the structural changes, general HSQC-based triple resonance experiments could not be used for 62 kDa Hsp31 protein. Here, we prepared the per-deuterated Hsp31 and performed the TROSY-based triple resonance experiments for the bbCSs assignment. Here, detailed processes of per-deuteration and the NMR experiments are described for other similar NMR approaches.
ARC-H: Adaptive replacement cache management for heterogeneous storage devices
Kim, Young-Jin,Kim, Jihong Elsevier 2012 JOURNAL OF SYSTEMS ARCHITECTURE - Vol.58 No.2
<P><B>Abstract</B></P><P>Heterogeneous storage architectures combine the strengths of different storage devices in a synergistically useful fashion, and are increasingly being used in mobile storage systems. In this paper, we propose ARC-H, an adaptive cache replacement algorithm for heterogeneous storage systems consisting of a hard disk and a NAND flash memory. ARC-H employs a dynamically adaptive management policy based on ghost buffers and takes account of recency, I/O cost per device, and workload patterns in making cache replacement decisions. Realistic trace-driven simulations show that ARC-H reduces service time by up to 88% compared with existing caching algorithms with a 20Mb cache. ARC-H also reduces energy consumption by up to 81%.</P>
JiHong Kim,HyeSeon Lee,GwangMo Hwang 강원대학교 산림과학연구소 2011 Journal of Forest Science Vol.27 No.1
Based upon the vegetation data of woody plants by plot sampling method in the natural deciduous forest of Mt. Jeombong, the study was carried out to examine importance value, rank abundance curve, and species abundance curve, and comparatively evaluate seven different species diversity indices for Shannon-Wiener index, Simpson index, McIntosh index, Log series, Margalef index, Berger-Parker index, and species richness, according to topographic positions. The minimal area which meant only few more species were increased was 3.48 ha in total. The dominant species of valley were Carpinus cordata, Acer pseudo-sieboldianum, Quercus mongolica, Acer mono, and Abies holophylla, and the dominant species of mid-slope were Quercus mongolica, Acer pseudo-sieboldianum, Carpinus cordata, Tilia amurensis, and Fraxinus rhynchophylla. Moreover, the dominant species of ridge were Quercus mongolica, Acer pseudo-sieboldianum, Tilia amurensis, Fraxinus rhynchophylla, and Acer mono. According to rank abundance curve and species abundance curve, species evenness was also low. All of Log series, species richness, Margalef, and Shannon-Wiener index discriminated that valley had the highest diversity, and ridge had the lowest diversity; but, Simpson index, McIntosh index, and Berger-Parker index represented that mid-slope had the highest diversity, and ridge had the lowest diversity. Uniquely, in Berger-Parker index, mid-slope was the higher value than total.