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11. 한국인의 북한이미지

Author

Choi Soon mi and Woo Young Lee

Subjects
Social integration, Perception, media_common.quotation_subject, Political science, Materials Chemistry, Social psychology, Internal conflict, media_common
Published
2019

23. Comparison of Multiple Sets and Progressive Single Set of Resistance Training on Muscle Mass and Strength in Rat

Author

Yoon Aram, Choi Soon-Mi, Hong Jun-Young, Kim Ki-Jeong, Lee Suk-Ho, and Hahn Dong-Woo

Subjects
medicine.medical_specialty, Physical medicine and rehabilitation, business.industry, Physiology (medical), Public Health, Environmental and Occupational Health, Physical therapy, medicine, Resistance training, Physical Therapy, Sports Therapy and Rehabilitation, Muscle mass, Set (psychology), business
Published
2015

43. Improved dielectric properties of the CaCu3Ti4O12 composites using BaTiO3-coated powder as precursor.

Author

Kim, Hui Eun, Choi, Soon-Mi, Hong, Youn-Woo, and Yoo, Sang-Im

Subjects
*TITANIUM dioxide, *CALCIUM compounds, *ELECTRIC properties of metals, *CHEMICAL precursors, *METAL powders, *CHEMICAL reduction
Abstract

Highlights: [•] We tried to reduce the dielectric loss and the leakage current of CaCu3Ti4O12 ceramics. [•] CaCu3Ti4O12 powder was coated with the BaTiO3 phase by a sol–gel process. [•] CaCu3Ti4O12 composite samples showed the lowered dielectric losses (<0.05) at ∼10kHz. [•] CaCu3Ti4O12 composite samples showed the reduced leakage currents at the DC field. [•] The BaTiO3 coating is effective to the improvement of their dielectric properties. [Copyright &y& Elsevier]

Published
2014
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46. Stability phase diagram of GdBa2Cu3O7− δ in low oxygen pressures.

Author

Lee, Jung-Woo, Choi, Soon-Mi, Song, Joo-Hyun, Lee, Jae-Hun, Moon, Seung-Hyun, and Yoo, Sang-Im

Subjects
*GADOLINIUM compounds, *PHASE diagrams, *STABILITY (Mechanics), *CHEMICAL decomposition, *MONOTECTIC reactions, *PRESSURE
Abstract

Highlights: [•] The stability phase diagram of GdBCO was constructed in the PO 2 regime of 1–100mTorr. [•] GdBCO was decomposed into Gd2O3 +Liquid (L1) for 20⩽ PO 2 ⩽100mTorr. [•] GdBCO was decomposed into Gd2O3 +GdBa6Cu3O y (Gd163)+L2 for 1⩽ PO 2 ⩽10mTorr. [•] A monotectic reaction between L1 and L2 +Gd163 occurred for 3⩽ PO 2 ⩽10mTorr. [Copyright &y& Elsevier]

Published
2014
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49. Improved dielectric properties of BaTiO3-added CaCu3Ti4O12polycrystalline ceramics

Author

Kim, Hui, Choi, Soon-Mi, Lee, Sung-Yun, Hong, Youn-Woo, and Yoo, Sang-Im

Abstract

The effects of the BaTiO3(BTO) additive on the electrical properties of CaCu3Ti4O12(CCTO) polycrystalline ceramics were systematically investigated. Various amounts of BTO powder up to 15 mol. % were added to CCTO powder. Each batch was ball-milled, pressed into pellets, and finally sintered at 1060°C for 12 h in air. Compared with pure CCTO sample (ɛr∼ 52,000 and tan δ∼ 0.38 at 100 kHz), BTO-added CCTO samples commonly showed significantly reduced dielectric losses although their dielectric constants were decreased approximately by one order of magnitude (for instance, ɛr∼ 4,075 and tan δ∼ 0.02 at 100 kHz for 5 mol. % BTO-added CCTO sample). In addition, the breakdown voltages of BTO-added CCTO samples were much higher than that of pure CCTO sample, and thus the leakage currents were greatly reduced at the applied voltage above ∼ 10 V. A large reduction in the dielectric losses and leakage currents is attributed to the secondary phases segregated at the CCTO grain boundary which are composed of CaTiO3, Ba4Ti12O27, and unreacted BTO.

Published
2013
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50. The role of carbon incorporation in SnO2 nanoparticles for Li rechargeable batteries

Author

Nam, Seunghoon, Kim, Sungsoo, Wi, Sungun, Choi, Hongsik, Byun, Sujin, Choi, Soon-Mi, Yoo, Sang-Im, Lee, Kyu Tae, and Park, Byungwoo

Subjects
*NANOPARTICLES, *STORAGE batteries, *LITHIUM cells, *ELECTRIC conductivity, *CARBONIZATION, *CHARGE transfer, *ELECTRIC impedance
Abstract

Abstract: Since carbothermal reduction of SnO2 occurs above 600°C, carbon-coating experiments using various polymer precursors have been carried out at relatively low temperatures (∼500°C). It is not likely, however, that the carbon synthesized at ∼500°C much enhances the conductivity of SnO2 anodes, because polymer precursors have undergone insufficient carbonization. This article confirms that the main role of carbon coating is sustaining the domain of each Sn nanoparticle by preventing its aggregation, and thereby improving the cycling performance of SnO2 nanoparticles. The transmission electron microscopy after cycling showing well dispersed Sn nanoparticles and electrochemical impedance spectroscopy revealing larger charge-transfer resistances with increasing carbon contents are in line with these interpretations. [Copyright &y& Elsevier]

Published
2012
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