• Journal of the Korean Geophysical Society
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• v.6 no.2
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• pp.89-97
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• 2003

For safety evaluation of a rockfill dam, it is often necessary to investigate spatial distribution and dynamic characterization of weak zones such as fractures. For this purpose, both seismic and electric methods are adopted together in this research. The former employs the multichannel analysis of surface waves (MASW) method, and aims at the mapping of 2-D shear-wave velocity (Vs) profile along the dam axis that can be associated with dynamic properties of filled materials. The latter is carried out by DC- resistivity survey with a main purpose of mapping of spatial variations of physical properties of dam materials. Results from both methods are compared in their signature of anomalous zones. In addition, downhole seismic survey was carried out at three points within the seismic survey lines and results by downhole seismic survey are compared with the MASW results. We conclude that the MASW is an efficient method for dynamic characterization of dam-filling materials, and also that joint analyses of these two seemingly unrelated methods can lead to an effective safety evaluation of rock-fill dam.

• Journal of the Korea Fashion and Costume Design Association
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• v.12 no.1
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• pp.141-151
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• 2010

The purpose of the study was to offer basic documents to the textile fashion industry by investigating changes of figures by various factors as each other social and environment. This study analyzes characterization and classification of body types of Mongolian men. 100 adult subjects within the 18 to 24 age group were studied. The physical measurements of the research subjects come up to a total of 63 items. Data was statistically analyzed with SPSS program using basic statistics, t-test, one-way ANOVA, Duncan-test, factor analysis and cluster analysis. The conclusions are as follows. In the result of factors analysis in physical measurements of Mongolian men, 10 factors such as the vertical size of body, on the obesity of body, the leg size, the bust from back length, the bust from front length, the shoulder size were extracted. The accumulated contributory rate of these was 73.86%. The cluster analysis for the comparison of the body types, by categorizing the body types produced three types. The comparison of 45 items in physical measurements between Korean men and Mongolian men resulted in the differences in 20 items. While the height items including stature between them showed negligible differences.

• Korean Journal of Materials Research
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• v.26 no.3
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• pp.123-129
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• 2016

The morphology, crystal structure and size of aerosol nanoparticles generated by erosion of electrodes made of different materials (titanium, copper and aluminum) in a multi-spark discharge generator were investigated. The aerosol nanoparticle synthesis was carried out in air atmosphere at a capacitor stored energy of 6 J, a repetition rate of discharge of 0.5 Hz and a gas flow velocity of 5.4 m/s. The aerosol nanoparticles were generated in the form of oxides and had various morphologies: agglomerates of primary particles of $TiO_2$ and $Al_2O_3$ or aggregates of primary particles of $Cu_2O$. The average size of the primary nanoparticles ranged between 6.3 and 7.4 nm for the three substances studied. The average size of the agglomerates and aggregates varied in a wide interval from 24.6 nm for $Cu_2O$ to 46.1 nm for $Al_2O_3$.

• Journal of the Korea Fashion and Costume Design Association
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• v.9 no.3
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• pp.75-85
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• 2007

This study analyzes characterization and classification of body types of Mongolian women. 100 adult subjects within the 20 to 49 age group were studied. The physical measurements of the research subjects come up to a total of 50 items. Data was statistically analyzed with SPSS program using basic statistics, t-test, one-way ANOV A, Duncan-test, factor analysis and cluster analysis. The conclusions are as follows. In the result of factors analysis in physical measurements of Mongolian women, 7 factors such as on the obesity of body, the vertical size of body, hip length, the bust from back length, the bust from front length, the ankle size and the shoulder size were extracted. The accumulated contributory rate of these was 70.7%. The cluster analysis for the comparison of the body types, by categorizing the body types produced three types. Mongolian women were grouped as those with the short stature and light weight, the medium stature and heavy weight, the tall stature and medium weight. The comparison of 50 items in physical measurements between Korean women and Mongolian women resulted in the differences in 39 items. While the height items including stature between them showed negligible differences, most of the length items relating to breadth, circumference, depth and obesity showed differences, which were big.

• Polymer(Korea)
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• v.37 no.6
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• pp.794-801
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• 2013

Novel microgels of N-isopropylacrylamide (NIPAM)-co-methacrylic acid (MAA) (NIPAM-co-MAA) with different contents of N,N-methylene bis acrylamide (MBA) were prepared by emulsion polymerization technique and were studied by Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS) and zeta potential measurement. Effect of pH, temperature and different salts concentration on the microgel particles was investigated. DLS results have shown that the hydrodynamic radius of the microgel increased upon increasing pH and decreased upon increasing temperature. The swelling/deswelling behaviors as determined by DLS showed the ionic repulsions of the carboxyl group of the methacrylic acid and hydrophobic interaction of NIPAM. The effect of various salts on volume phase transition temperature (VPTT) was also investigated. Upon increasing salt concentration, VPTT became broad and shifted to a lower temperature. Electrophoretic mobility measurements showed an increase with increasing pH and temperature at a constant ionic strength.

• Journal of the Korean Society of Clothing and Textiles
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• v.34 no.11
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• pp.1889-1899
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• 2010

This study examines the preparation and characterization of Kenaf/Starch bio-composites used as filler and a matrix. Kenaf was cultivated in Chung-ju in Korea, and the Kenaf/Starch bio-composites were prepared under various conditions of kenaf fiber length (1-5 centimeters); the content of Kenaf fiber was 10%, 20%, 30%, and 40%, and the number of composite layers (one-four). Depending on the formation conditions of Kenaf/Starch composites, the physical properties such as tensile strength, elongation, and the young modulus of the Kenaf/Starch composites were measured. In addition, we measured the SEM cross-section images in order to investigate the interfacial adhesion properties of fractured surfaces. As a result, the tensile strength and elongation of the Kenaf/Starch composites were highest in the molding conditions of a hot press at $120^{\circ}C$, 3000PSI of pressure, and for 30 minute periods. The result of measuring the physical properties of the composites manufactured by varying the content of Kenaf fiber when the content of Kenaf fiber was 30% as well the physical properties of the Kenaf/Starch composite was found desirable. It was found that the physical properties improved with more overlapped layers in the composites manufactured by varying the number of overlapped layers. Through the measuring of the SEM cross-section images, we found that the interfacial adhesion state between the filler and matrix of Kenaf/Starch composite greatly affects the physical properties.

• 한국생물공학회:학술대회논문집
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• 2003.10a
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• pp.179-183
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• 2003

• Proceedings of the Korean Society of Sericultural Science Conference
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• 2003.10a
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• pp.34-38
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• 2003

The silk fibre Produced by the larvae of the lepidopter of the Bombyx mori species is no doubt one of the most precious raw materials employed in manufacturing textile products. The present report, however, deals with silk not as a traditional textile fibre, but as a starting material fer biomedical applications. In recent years, the unique chemical and mechanical properties of silk have made this protein polymer highly attractive for innovative applications, which mainly focus on the development of devices for biomedical uses. (omitted)

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2003.05b
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• pp.179-180
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• 2003

황사가 발생하는 중국 지역의 토양 특성은 우리나라로 이동되어온 황사성분의 특성을 결정하는 중요한 요소중의 하나이다. 따라서, 황사토양입자의 특성과 지역적 차이에 대한 자료를 마련하기 위해 대표적인 황사 발생원으로 알려져 있는 중국 내륙의 황토지역과 북부 사막지역을 포함하는 총 37개의 토양 시료를 중국에서 채취하였으며, 채취한 각 토양시료의 분석을 통해 황사토양입자의 물리ㆍ화학적 특성을 파악하고자 하였다. (중략)

• Bulletin of the Korean Chemical Society
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• v.32 no.6
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• pp.2097-2100
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• 2011