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Kang, Boseok,Min, Honggi,Seo, Unsuk,Lee, Junghwi,Park, Namwoo,Cho, Kilwon,Lee, Hwa Sung WILEY‐VCH Verlag 2013 ADVANCED MATERIALS Vol.25 No.30
<P><B>A capillary pen drawing technique, developed as a new patterning methodology</B> for the large‐area patterning and fabrication of organic electronics, provides several advantages over conventional approaches: the method is simple and versatile, there are no restrictions on the patterning shapes that could be produced, and the method can be tailored to a variety of substrates.</P>
Kang, Boseok,Park, Namwoo,Lee, Jeonghwi,Min, Honggi,Choi, Hyun Ho,Lee, Hwa Sung,Cho, Kilwon American Chemical Society 2015 Chemistry of materials Vol.27 No.13
<P>This study systematically demonstrates the effects of the grain structure of crystalline self-assembled monolayers (SAMs) on the growth of organic semiconductor thin films on such monolayers, as well as the electrical characteristics of the resulting semiconductor films. The grain structure of the octadecyltrichlorosilane (OTS) monolayers could be tailored by constructing the monolayers at three different temperatures: -30 degrees C (-30 degrees C OTS), -5 degrees C (-5 degrees C OTS), and 20 degrees C (20 degrees C OTS). Among the three layers, -30 degrees C OTS exhibited the largest crystalline grains and longest-range homogeneity of alkyl chain arrays. We found that pentacene films deposited on -30 degrees C OTS monolayers show larger crystalline grains with higher degrees of crystallinity and lateral alignment compared to that of films deposited on -5 degrees C OTS or 20 degrees C OTS monolayers, following the surface characteristics of the underlying OTS monolayers. Furthermore, pentacene field-effect transistors fabricated with 30 degrees C OTS monolayers showed lower charge trap densities and higher field-effect mobility values than devices fabricated using 5 or 20 degrees C OTS monolayers. These results are explained in terms of enhanced quasi-epitaxial growth of pentacene films on OTS monolayers with large grains.</P>
Jo Namwoo,Oh Jaehoon,Kang Hyunggoo,Lim Tae Ho,고벽성 대한응급의학회 2022 Clinical and Experimental Emergency Medicine Vol.9 No.2
Objective To examine the association of inferior vena cava (IVC) diameter ratio measured using computed tomography with outcomes in patients with gastrointestinal bleeding (GIB).Methods A single-center retrospective observational study was conducted on consecutive patients with GIB who presented to the emergency department. The IVC diameter ratio was calculated by dividing the maximum transverse and anteroposterior diameters perpendicular to it. The association of the IVC diameter ratio with outcomes was examined using multivariable logistic regression analysis. The primary outcome was in-hospital mortality. The area under the receiver operator characteristic curve (AUC) of the IVC diameter ratio was calculated, and the sensitivity and specificity, including the cutoff values, were computed.Results In total, 585 patients were included in the final analysis. The in-hospital mortality rate was 4.6% (n=27). The IVC diameter ratio was significantly associated with higher in-hospital mortality in multivariable logistic regression analysis (odds ratio, 1.793; 95% confidence interval [CI], 1.239–2.597; P=0.002). The AUC of the IVC diameter ratio for in-hospital mortality was 0.616 (95% CI, 0.498–0.735). With a cutoff of the IVC diameter ratio (≥2.1), the sensitivity and specificity for predicting in-hospital mortality were 44% (95% CI, 26%–65%) and 71% (95% CI, 67%–75%), respectively.Conclusion The IVC diameter ratio was independently associated with in-hospital mortality in patients with GIB. However, the AUC of the IVC diameter ratio for in-hospital mortality was low.
Design-oriented study on target station for spallation neutron source at KOMAC
Lee Pilsoo,Kang Namwoo,Jang Yongsik 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.83 No.2
A neutron-production target system, composed of targets, moderators, refectors, and shielding, has been conceptually designed for the future MW-class spallation neutron source based on a high-intensity proton accelerator at KOMAC. For targetry, we tentatively adopted a fxed-metal target concept; tantalum-clad tungsten plates in a water-cooled target shroud made of stainless steel. In the thermal analysis and stress calculations using ANSYS, the von Mises stress was found to exceed the yield stress of SS316L at the edges of the structure for a 500-kW proton beam on target. Relatively high stress at edges seems to be a stress concentration that could be reduced by minor design modifcations. Preliminary calculation results for a conservative design of target shielding show that radiation dose after the outermost shielding could be lower than 10 μSv/h in a 500-kW operation condition, implying that the design could be optimized to reduce construction costs without loss of shielding performance.