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Kim, Sangsub,Choi, Pyungho,Kim, Hyunki,Kim, Soonkon,Shin, Junyong,Lee, Jaeseob,Kim, Sangsoo,Choi, Byoungdeog American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.10
<P>In this research, we investigated the interface traps of poly-Si TFTs using charge pumping methods and analyzed effect of hot carrier stress by comparing interface trap distribution. These methods applied three types of pulse shapes, which were square, triangular, and trapezoidal. The interface state density, D-it, was measured by varying the frequency, pulse amplitude, and rise/fall times from the square pulse method. We found that Dit decreased due to the decreasing recombination of trapped carriers, and the majority carriers decreased by thermal emission depending on the temperature. We also confirmed the relation between space charge region and source-drain region according to reverse bias. Additionally, the mean interface-state density and capture cross-section, Q(ss), were extracted from the recombined charge versus pulse frequency curve created by the triangle pulse method. To explain the effects of the HC stress of poly TFTs, the interface trap states were measured before and after application of the hot carrier stress. The experimental results showed that the capture cross-section was doubled from 1.1 x 10(-14) cm(2) to 2.27 x 10(-14) cm(2) and interface trap distribution was changed after the HC stress. Finally, we confirmed that, after applying the hot carrier stress, the energy distribution of the interface state reflected the location of the induced damage region caused by the hot carrier stress and the observed shift of deep trap states affected the drain current in the subthreshold region and increased the subthreshold swing.</P>
Kim, Junhyeong,Kim, Hyunki,Kim, Jooyoung,Kim, Jung Hwan,Ahn, Sang Hyun Elsevier 2019 JOURNAL OF ALLOYS AND COMPOUNDS Vol.807 No.-
<P><B>Abstract</B></P> <P>The development of high-performance gas diffusion electrodes is essential for the fabrication of efficient proton exchange membrane water electrolyzers (PEMWEs) and thus for clean hydrogen production. Herein, we electrodeposited Fe-based binary and ternary phosphides on porous carbon paper (CP) as a substrate and demonstrated that, under optimized deposition conditions (i.e. when the P content was maximum), amorphous FeCoP showed the highest intrinsic activity for hydrogen evolution in an acidic medium. This behavior was ascribed to appropriate electronic structure modification and the alloying effect. Further enhancement of hydrogen evolution performance was achieved by increasing the electrochemical surface area of FeCoP by using a porous Cu foam (CF) support. In a half-cell test, the FeCoP/CF/CP electrode featured an acceptably stable cathodic current of −10 mA/cm<SUP>2</SUP> at an overpotential of −125 mV. A PEMWE single cell with an FeCoP/CF/CP cathode exhibited a current density of 0.95 A/cm<SUP>2</SUP> at a cell voltage of 2.0 V, which is superior to or comparable with previously reported values. Thus, the developed electrode might be a promising alternative to Pt-based cathodes in practical PEMWE applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fe-based transition metal phosphides were electrodeposited on porous carbon paper. </LI> <LI> FeCoP/carbon paper (CP) showed the highest HER intrinsic activity. </LI> <LI> The electrochemical surface area of FeCoP was increased by using a Cu foam support. </LI> <LI> PEMWE with a FeCoP/CF/CP cathode featured a current density of 0.95 A/cm<SUP>2</SUP> at 2.0 V. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kim, Hyo Song,Koom, Woong Sub,Baek, Song-Ee,Kim, Hyoung-Il,Jung, Minkyu,Beom, Seung-Hoon,Kang, Beodeul,Kim, Hyunki,Chang, Jee Suk,Choi, Yoon Young,Son, Taeil,Cheong, Jae-Ho,Noh, Sung Hoon,Kim, Eun Hye Elsevier Science Publishers 2019 Radiotherapy and oncology Vol.140 No.-
<P><B>Abstract</B></P> <P><B>Background and purpose</B></P> <P>To evaluate the safety and efficacy of preoperative chemotherapy (CTx) followed by chemoradiotherapy (CCRT) for high-risk gastric cancer (GC).</P> <P><B>Methods and materials</B></P> <P>The inclusion criteria were as follows: (1) Borrmann type 4; (2) large Borrmann type 3 (≥8 cm); (3) single bulky (≥3 cm × 1) or multiple lymph nodes (≥1.5 cm × 3). Patients received two 21-day courses of induction CTx of TS-1 (35 mg/m<SUP>2</SUP>, p.o, twice daily on days 1–14), docetaxel (30 mg/m<SUP>2</SUP>, i.v., days 1 and 8), and cisplatin (30 mg/m<SUP>2</SUP>, i.v., days 1 and 8) followed by CCRT (two courses of TS-1 and cisplatin in combination with 45 Gy radiation).</P> <P><B>Results</B></P> <P>Forty-two patients were enrolled between March 2014 and February 2016, and 39 of these completed sequential CTx and CCRT. Among the 33 patients who underwent R0 resection, the pathologic response rate was 39.4% [no residual carcinoma (<I>n</I> = 5, 15.2%), with 1–10% residual carcinoma (<I>n</I> = 8, 24.2%)]. Overall, 4 patients (12.1%) were pathologic stage 0, 7 (21.2%) were stage I, 10 (30.3%) were stage II, and 12 (36.4%) were stage III. The overall survival rate at 3 years was 77.9% for stages 0 and I, 66.8% for stages II–III, and 33.3% for unresectable cases (<I>P</I> = 0.001). Toxicity was mild to moderate with grade 4 neutropenia (<I>n</I> = 1) and neutropenic fever (<I>n</I> = 1) as the most prominent side-effects.</P> <P><B>Conclusions</B></P> <P>Sequential CTx and CCRT prior to surgery are feasible and effective for high-risk GC.</P> <P>Trial registration number: NCT02495493.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A complex preoperative staging was adopted for high-risk GC. </LI> <LI> We adopted an intensive, weekly-split, triplet regimen with favorable toxicities. </LI> <LI> Induction chemotherapy and chemoradiotherapy indicate a promising outcome. </LI> </UL> </P>
Kim, Jie-Hyun,Choi, Yeun Jung,Lee, Sang Hun,Shin, Hyun Soo,Lee, In Ohk,Kim, Yu Jin,Kim, Hyunki,Yang, Woo Ick,Kim, Hoguen,Lee, Yong Chan Spandidos Publications 2010 ONCOLOGY REPORTS Vol.23 No.6
<P>This study aimed to investigate the effect of Helicobacter pylori (H. pylori) infection on the sonic Hedgehog (Shh) signaling in gastric cancer. Shh, Patched (Ptch), and transcription factor Gli1 were overexpressed in H. pylori-infected gastric cancer cells. The oncoprotein, CagA positive H. pylori resulted in significantly higher Shh expression. Pretreatment with MG-132 or PDTC significantly lowered Shh expression. Significant overexpression of Shh and Gli1 were noted in H. pylori-infected compared to non-infected gastric cancer tissues. Conclusively, H. pylori activated the Shh signaling pathway in CagA-dependent manner partly through the NF-kappaB pathway in gastric cancer cells.</P>
A transition metal oxysulfide cathode for the proton exchange membrane water electrolyzer
Kim, Hyunki,Kim, Junhyeong,Kim, Soo-Kil,Ahn, Sang Hyun Elsevier 2018 Applied Catalysis B Vol.232 No.-
<P><B>Abstract</B></P> <P>In this study, the performance of transition metal oxysulfides as cathodes has been explored for a proton exchange membrane water electrolyzer (PEMWE). Simple electrodeposition and anion exchange methods provide facile control of the morphology and composition of Ni<SUB>y</SUB>Co<SUB>1-y</SUB>O<SUB>x</SUB>S<SUB>z</SUB> catalysts deposited as gas diffusion electrodes on carbon paper substrates. After sulfidation, the overpotential for the hydrogen evolution reaction (HER) was significantly reduced and the intrinsic activity of the HER showed volcano behaviors as a function of the composition and binding energy of S in the electrodes. The PEMWE employing such a cathode demonstrates a reasonable current density of 0.72 A/cm<SUP>2</SUP> at a cell voltage of 2.0 V. The results presented herein demonstrate that the non-noble catalyst can be adopted as a cathode in PEMWE operation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Transition metal oxysulfides were electrochemically prepared on carbon paper. </LI> <LI> The highest intrinsic activity for HER was obtained at a S ratio of 0.25. </LI> <LI> The ratio of S atoms having higher binding energy affected HER intrinsic activity. </LI> <LI> PEMWE employing transition metal oxysulfide cathode showed reasonable performance. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Growth Patterns of Signet Ring Cell Carcinoma of the Stomach for Endoscopic Resection
( Hyunki Kim ),( Jie-hyun Kim ),( Yong Chan Lee ),( Hoguen Kim ),( Young Hoon Youn ),( Hyojin Park ),( Seung Ho Choi ),( Sung Hoon Noh ),( Takuji Gotoda ) 대한소화기학회 2015 Gut and Liver Vol.9 No.6
Background/Aims: It is difficult to precisely detect the lateral margin during endoscopic submucosal dissection (ESD) for signet ring cell carcinoma (SRC) because SRC often expands to lateral direction through the lamina propria. Thus, the aim of this study was to classify the intramucosal spreading patterns of SRC and to analyze the patients’ clinicopathological findings according to the spreading patterns. Methods: The intramucosal spreading patterns of SRC were classified as expansive or infiltrative types. A total of 100 surgical and 42 ESD specimens were reviewed. Results: In the surgical specimens, the proportions of expansive and infiltrative types were 44% and 56%, respectively. The infiltrative type was more commonly associated with old age, atrophy, and intestinal metaplasia in surrounding mucosa and the absence of Helicobacter pylori compared with the expansive type. In ESD specimens, the proportions of expansive and infiltrative types were each 50%. When lateral margin-positive lesions were compared with -negative lesions, larger size, residual lesion, and the lack of a neutrophil infiltration were more significantly associated with lateral margin-positive lesions.All cases with residual tumors in lateral margin-positive lesions were classified as the infiltrative type. Conclusions: SRC surrounded with atrophy and/or intestinal metaplasia often spreads subepithelially in the margin. This finding may suggest that a larger safety margin is necessary in this type during ESD. (Gut Liver 2015,9:720-726)
Kim, Hyunwoo,Kim, Sangsub,Kim, Hyunki,Lee, Jaeseob,Kim, Sangsoo,Choi, Byoungdeog American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.10
<P>We investigated the electrical properties of solution-processed nanolaminates composed of zirconium oxide (ZrO2) and aluminum oxide (Al2O3) as gate insulator materials for thin-film transistors (TFTs). We fabricated MOS capacitors using Al2O3/ZrO2/Al2O3 and ZrO2/Al2O3/ZrO2 nanolaminate stacks through solution processing. The fabricated nanolaminates showed low leakage current densities and high dielectric constants. Also, solution-processed InSnZnO (ITZO) TFTs were fabricated on nanolaminates. Among these devices, the Al2O3/ZrO2/Al2O3 stack showed the best performance in terms of its switching operation, with a high on/off current ratio (>10(6)), high mu(sat) (0.28 cm(2)/Vs), and low subthreshold swing (0.25 V/dec). The superior characteristics of these nanolaminates originated from the high dielectric constant of ZrO2 (>20) and the high band gap energy of Al2O3 (8.9 eV), which generates a large band offset between the gate insulator and active layer to effectively block the leakage current.</P>