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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, Jihong,Khim, Dongyoon,Kang, Rira,Lee, Seung-Hoon,Baeg, Kang-Jun,Kang, Minji,Noh, Yong-Young,Kim, Dong-Yu American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.11
<P>Here, we report the simultaneous attainment of efficient electron injection and enhanced stability under ambient conditions for top-gate/bottom-contact (TG/BC), n-type, organic field-effect transistors (OFETs) using water-soluble polyfluorene derivatives (WPFs). When inserting the WPF interlayers between a semiconductor and the BC Au electrodes, initially the ambipolar (6,6)-phenyl-C<SUB>61</SUB>butyric acid methyl ester (PCBM) OFETs were fully converted to unipolar charge transport characteristics that were exclusively n-type with significantly increased electron mobilities as high as 0.12 cm<SUP>2</SUP>/(V s) and a decreased threshold voltage. These improvements were mostly attributed to the interfacial dipoles of WPF layers that aligned to form a favorable energy band structure for efficient electron injection and to effectively block counter charge carriers. These were confirmed when values for the reduced work function of metal electrodes with WPFs and their correlated contact resistance were measured via the ultraviolet photoemission spectroscopy and the transmission-line method, respectively. Moreover, the WPF interlayers played an important role in air stability of PCBM OFETs that exhibited higher and appreciably enhanced by increasing the ethylene-oxide side chain lengths of WPFs, which presumably was due to the water/oxygen/ion capturing effects in the hydrophilic interlayers.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-11/am500466q/production/images/medium/am-2014-00466q_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am500466q'>ACS Electronic Supporting Info</A></P>
PAW: A Pattern-Aware Write Policy for a Flash Non-volatile Cache
KIM, Young-Jin,KIM, Jihong,LEE, Jeong-Bae,RIM, Kee-Wook The Institute of Electronics, Information and Comm 2010 IEICE transactions on information and systems Vol.93 No.11
<P>In disk-based storage systems, non-volatile write caches have been widely used to reduce write latency as well as to ensure data consistency at the level of a storage controller. Write cache policies should basically consider which data is important to cache and evict, and they should also take into account the real I/O features of a non-volatile device. However, existing work has mainly focused on improving basic cache operations, but has not considered the I/O cost of a non-volatile device properly. In this paper, we propose a pattern-aware write cache policy, PAW for a NAND flash memory in disk-based mobile storage systems. PAW is designed to face a mix of a number of sequential accesses and fewer non-sequential ones in mobile storage systems by redirecting the latter to a NAND flash memory and the former to a disk. In addition, PAW employs the synergistic effect of combining a pattern-aware write cache policy and an I/O clustering-based queuing method to strengthen the sequentiality with the aim of reducing the overall system I/O latency. For evaluations, we have built a practical hard disk simulator with a non-volatile cache of a NAND flash memory. Experimental results show that our policy significantly improves the overall I/O performance by reducing the overhead from a non-volatile cache considerably over a traditional one, achieving a high efficiency in energy consumption.</P>
Prognosis of HER2 overexpression in small T1N0M0 breast cancer: A single center experience in Korea
( Jihong Bae ),( Hee Kyung Ahn ),( Kwan Il Kim ),( Heung Kyu Park ),( Yong Soon Chun ),( Young Saing Kim ),( Inkeun Park ),( Junshik Hong ),( Sun Jin Sym ),( Jinny Park ),( Eun Kyung Cho ),( Jae Hoon 대한내과학회 2015 대한내과학회 추계학술대회 Vol.2015 No.1
Introduction: A role of adjuvant treatment in patients with T1abN0M0 human epidermal growth factor receptor 2 (HER2)-positive breast cancer remains controversial. In this study, we investigated the prognosis of pT1abN0M0 breast cancer according to HER2 and hormone-receptor status. Methods: We retrospectively reviewed consecutive 536 patients diagnosed with T1a-cN0M0 breast cancer between 2003 and 2012 in a single center. Invasive disease free survival (IDFS), distant recurrence free survival (DRFS), and overall survival (OS) were estimated and compared by Kaplan-Meier method and log-rank test. Results: With a median estimated potential follow-up of 53 months, 5-year IDFS rate was 96.1% (92.3% in T1abN0, 97.3% in T1cN0), DRFS rate 98.3% (97.6% in T1abN0, 98.5% in T1cN0), and OS rate 98.4% (97.6% in T1abN0, 98.6% in T1cN0). Among 142 patients with T1abN0M0, IDFS in HER2 (+) disease (n=31, 5-year IDFS rate 73.2%, 5-year DRFS rate 96.3%) was significantly inferior to those with HR (+)/HER2 (-) disease (n=63, 5-year IDFS rate 98.4%, no distant recurrence has occurred during follow-up period) or TN (n=14, no recurrence has occurred during follow-up period). IDFS in HER2 (+) T1abN0 disease was not significantly different by HR status (5-year IDFS rate 64.1% in HR (+) HER2 (+) vs. 40.0% in HR (-) HER2 (+), p=0.104). Conclusions: In Korean patients with T1abN0M0 breast cancer, HER2 overexpression was associated with worse IDFS.
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.
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.