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Kwon, Yo Han,Woo, Sang‐,Wook,Jung, Hye‐,Ran,Yu, Hyung Kyun,Kim, Kitae,Oh, Byung Hun,Ahn, Soonho,Lee, Sang‐,Young,Song, Seung‐,Wan,Cho, Jaephil,Shin, Heon‐,Cheol,Kim, Je Y WILEY‐VCH Verlag 2012 Advanced Materials Vol.24 No.38
<P>The first ever demonstration of a cable‐type lithium ion battery architecture with outstanding omni‐directional flexibility is described by Je Young Kim, Heon‐Cheol Shin, and co‐workers on page 5192. The Front Cover image illustrates the unique battery architecture comprising a skeleton frame surrounding an empty space, that is, a hollow‐spiral anode with a multi‐helical structure. This design enables the battery to reliably power an LED screen or an MP3 player even under severe mechanical twisting and bending. </P>
Growth and Properties of Sb-doped ZnMgO Thin Films Deposited Using rf Magnetron Sputtering
Sung Mook Chung,Jae Heon Shin,Min Ki Ryu,Chi-Sun Hwang,Hye Yong Chu,Kyoung Ik Cho 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.3
We report on the growth and the properties of Sb-doped ZnMgO thin films deposited using radiofrequency (rf) magnetron sputtering for applications as transparent thin film transistors (TFTs) with p-type channels. The target was prepared with high-purity MgO mixed with ZnO and Sb2O5 as doping agents. Thin films were heat-treated in vacuum, oxygen, and nitrogen atmospheres. The effects of the working gas (Ar/O2) ratios and the annealing conditions on the structural and the electrical properties were investigated. The atomic ratio of Zn/Mg in the films, and accordingly the films properties, depended on the post-annealing conditions and on the oxygen partial pressure in the working gas during sputtering. We report on the growth and the properties of Sb-doped ZnMgO thin films deposited using radiofrequency (rf) magnetron sputtering for applications as transparent thin film transistors (TFTs) with p-type channels. The target was prepared with high-purity MgO mixed with ZnO and Sb2O5 as doping agents. Thin films were heat-treated in vacuum, oxygen, and nitrogen atmospheres. The effects of the working gas (Ar/O2) ratios and the annealing conditions on the structural and the electrical properties were investigated. The atomic ratio of Zn/Mg in the films, and accordingly the films properties, depended on the post-annealing conditions and on the oxygen partial pressure in the working gas during sputtering.
Case Reports : A Case of Hereditary Angioedema Associated with Idiopathic Hypoparathyroidism
Sang Hoon Kim,Byung Jae Lee,Yoon Seok Chang,Yoon Keun Kim,Sang Heon Cho,Kyung Up Min,You Young Kim 대한내과학회 2001 The Korean Journal of Internal Medicine Vol.16 No.4
Hereditary angioedema is a rare autosomaldominant disease characterized by the edema of subcutaneous tissues, respiratory tract and bowel. It is caused by the deficiency of C1 esterase inhibitor. Hereditary angioedema may be associated with autoimmune dise
Could cluster of risk factors predict clinical outcome in patients with acute myocardial infarction?
( Sang Mi Park ),( Hong Nyun Kim ),( Se Yong Jang ),( Myung Hwan Bae ),( Dong Heon Yang ),( Hun Sik Park ),( Yongkeun Cho ),( Shung Chull Chae ),( Jang Hoon Lee ) 대한내과학회 2015 대한내과학회 추계학술대회 Vol.2015 No.1
Purpose: Conventional risk factors are differently contributed to short-term prognosis of acute myocardial infarction (AMI); hypertension and diabetes increase adverse outcome, whereas hyperlipidemia, smoking, and obesity paradoxically decrease adverse outcome of post-MI patients. The aim of this study is to assess whether cluster of conventional risk factors, PARADOCS (Pressure of ARtery Abnormality, Diabetes, Obesity, Cholesterol, Smoking) score, would improve the ability to predict major adverse cardiac events (MACEs) in patients with AMI. Methods: Between November 2005 and July 2011, 24,020 patients (17,232 men; mean age=63.0±12.8) with AMI were analyzed from Korean AMI registry. PARADOCS score was calculated as follows; [number of non-paradoxical risk factors (NRF) -number of paradoxical risk factors (PRF)]+3 in which non-paradoxical risk factors are hypertension and diabetes, and paradoxical risk factors are the rest. The 1-year MACEs were defined as death and non-fatal MI. Results: NRF including hypertension and diabetes were present in 49.6% and 27.0%, whereas PRF including hyperlipidemia, smoking, and obesity were present in 12.3%, 43.0%, and 34.6%, respectively. During the follow-up, 1,409 (5.9%) MACEs occurred. PARADOCS score was significantly higher in patients with 1-year MACEs (3.38±1.03 versus 2.81±1.08, p<0.001). In Cox proportional hazards model, PARADOCS score was an independent predictor of 1-year MACEs (hazards ratio 1.26, 95% confidence interval 1.18-1.34; p<0.001) after adjusting for confounding variables. Patients were categorized into 3 groups according to the PARADOCS score; PARADOCSLOW (0-1, n=2,446), PARADOCSMID (2-3, n=14,594), and PARADOCSHIGH (4-5, n= 6,980). Kaplan-Meier survival curve showed that there were significant differences in the 1-year MACEs among three groups including 3.5% in PARADOCSLOW, 8.5% in PARADOCSMID, and 16.4% in PARADOCSHIGH, respectively (long-rank p<0.001). Conclusions: In post-MI patients, conventional risk factors are differently associated with short-term prognosis, and score of these risk factors, PARADOCS score, can provide useful prognostic information to clinicians.
Cho, Sung Haeng,Ko, Jong Beom,Ryu, Min Ki,Yang, Jong-Heon,Yeom, Hye-In,Lim, Sun Kwon,Hwang, Chi-Sun,Park, Sang-Hee Ko Institute of Electrical and Electronics Engineers 2015 IEEE transactions on electron devices Vol. No.
<P>We report the electrical characteristics of backchannel etch (BCE) metal–oxide–semiconductor thin-film transistor (TFT) comprised of aluminum-doped tin–zinc–indium oxide (ATZIO). It has high etch selectivity in wet chemical etchants, which consist of H<SUB>3</SUB>PO<SUB>4</SUB>, CH<SUB>3</SUB>COOH, and HNO<SUB>3</SUB>. This is contrary to the conventional metal–oxide–semiconductors of indium–gallium–zinc oxides, which are highly soluble in the acidic chemicals. As a result, no etch stop layer is needed to protect the backchannel from the wet etchant damage during the source and drain patterning in the bottom-gate-staggered TFT structure. This provides the possibility of oxide TFT fabrication process made as simple as that of the current amorphous silicon TFT using three or four photomasks with short channel length and less parasitic capacitance. The electrical characteristics of our ATZIO BCE-TFTs have the mobility of 21.4 cm<SUP>2</SUP>/ <TEX>$\text{V}\cdot \text{s}$</TEX>, subthreshold swing (S.S) of 0.11 V/decade, and threshold voltage of 0.8 V. In spite of the BCE structure, they have excellent stability against bias temperature stress, which shows the threshold voltage shifts of +0.75 V and −0.51 V under the prolonged positive (+20 V) and negative (−20 V) gate bias stresses for 10 000 s at 60 °C, respectively.</P>
Cho, Seong-Heon,Lee, Sang Soo,Jung, Sungyup,Park, Young-Kwon,Lin, Kun-Yi Andrew,Lee, Jechan,Kwon, Eilhann E. Elsevier 2019 Energy conversion and management Vol.201 No.-
<P><B>Abstract</B></P> <P>This study aimed to determine the synergistic effects of CO<SUB>2</SUB> on the catalytic pyrolysis of pine sawdust over a Ni-based catalyst (Ni/SiO<SUB>2</SUB>) to establish a sustainable platform for H<SUB>2</SUB> production. To elucidate the reaction mechanism, the CO<SUB>2</SUB>-cofeeding pyrolysis of pine sawdust was performed. The CO<SUB>2</SUB>-cofeeding pyrolysis of pine sawdust proved that the gas-phase reaction between CO<SUB>2</SUB> and pyrolysates led to the increase in the amount of generated CO. The CO<SUB>2</SUB> enhanced thermal cracking and dehydrogenation. These mechanistic features of CO<SUB>2</SUB> were catalytically enhanced when Ni/SiO<SUB>2</SUB> was employed as heterogeneous catalyst, which led to an increase in the amounts of generated H<SUB>2</SUB> and CO. Hence, the CO that was additionally generated during the gas-phase reaction of CO<SUB>2</SUB> and pyrolysates could be further converted into H<SUB>2</SUB>. In addition, CO<SUB>2</SUB> could be looped in the CO<SUB>2</SUB>-cofeeding pyrolysis of pine sawdust. Furthermore, exploiting CO<SUB>2</SUB> as raw material or reactive gas medium in the catalytic pyrolysis process also offered a strategic means for preventing coke formation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CO<SUB>2</SUB> offers a strategic means to maximize the carbon utilization and H<SUB>2</SUB> production. </LI> <LI> CO<SUB>2</SUB> expedites kinetics of gas phase reaction between CO<SUB>2</SUB> and volatile pyrolysates. </LI> <LI> Ni/SiO<SUB>2</SUB> catalytically enhances mechanistic roles of CO<SUB>2</SUB> in pyrolysis. </LI> <LI> Exploiting CO<SUB>2</SUB> in catalytic pyrolysis could prevent coke formation. </LI> </UL> </P>