• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 1999.10a
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• pp.57-60
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• 1999

Geochemical study was carried out to find out soil contamination at the heaped soil, moved from bottom of the storage pond in Pohang industrial complex, in Moondug, Chemical analysis showed that contents of heavy metals in the soil were higher than those of the ordinary soil. Contents of Cu and Cd in the soil exceeded Korean standard of soil contamination. Especially content of Cu exceeded Korean standard of soil contamination(50ppm) at the six points and at one point content of Cu was 113.3ppm. Contents of Be were so higher than U.S RCRA standard(0.2ppm) that they can affect soil environment. The followed research about relation between pollutant and soil and proper measures are required to prevent soil contamination from affecting environment of Moondug.

• Carbon letters
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• v.1 no.1
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• pp.17-21
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• 2000

Catalytic reduction and oxidation of NO over polyacrylonitrile based activated carbon fibers (PAN-ACF) under various conditions were carried out to develop removal process of NO from the flue gas. The effect of temperature, oxygen concentration and the moisture content for the reduction of NO with ammonia as a reducing agent was investigated. The reduction of NO increased with the oxygen concentration, but decreased with the increased temperature. The moisture content in the flue gas affects the reduction of NO as the inhibition of the adsorption of the other components and the reaction on the surface of ACE For the oxidation of NO to $NO_2$ over PAN-ACF without using a reducing gas, it showed the temperature and the oxygen concentration of the flue gas are the important factors for the NO conversion in which the conversion increased with oxygen concentration and decreased with the temperature increase and might be the alternative option for the selective catalytic reduction process.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2013.11a
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• pp.54-55
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• 2013

Recently, The economic growth has increased carbon dioxide emissions. so, It is caused by social problem to environmental damage and human health due to global warming. Accordingly, The method solution is to the amount of cement and to use industrial by-product such as Blast furnace slag, Fly Ash, and Red-mud. Thus, The purpose of this study is to analyze the physical property of concrete with red-mud. So, this study carries out the basic performance test of concrete such as, air content, slump, and compressive strength. In this work test is conducted according to sequence of materials using concrete twin mixer.

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2006.09a
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• pp.623-624
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• 2006

The behavior of hardmetals under cyclic loads is investigated. Unnotched specimens were employed to obtain practical information regarding fatigue in hardmetals. All the tested hardmetals exhibit an increase in the number of cycles until failure with a decrease in the maximum stress, i.e., the hardmetals exhibit a high fatigue sensitivity. The fatigue strength increases with the cobalt content. Although distinct fatigue limits, as observed in metals, cannot be observed, the calculated fatigue limit stress at $10^7$ cycles is found to be approximately 70% of the flexural strength, and the stress value exhibits a linear relationship with the flexural stress.

• Archives of Metallurgy and Materials
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• v.64 no.3
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• pp.879-882
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• 2019

The present study, aims to investigate the effect of minor Zr and Nb alloying on soft magnetic and electrical properties of Fe₈₆(Zr_xNb_1-x)₇B₆Cu₁ (x = 1, 0.75, 0.5, 0.25) alloys. The investigated alloys were prepared through the melt spinning process. Within the examined compositional range (Nb up to 5.25at%, respectively), the soft magnetic properties and electrical resistivity of the alloys continuously increase with increasing Nb content. However increasing the Nb content further decreases such properties. We could confirm the influence of ratio of Zr and Nb on grain growth and crystallization fraction during crystallization by using the soft magnetic properties and electrical properties.

• Archives of Metallurgy and Materials
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• v.65 no.3
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• pp.1029-1033
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• 2020

In this study, we investigated the effect of Fe addition (0, 0.25, 0.50 and 0.75 wt.%) on the microstructure, mechanical properties and electrical conductivity of as-cast and as-extruded Al-RE alloys. As the Fe element increased by 0 and 0.75wt.%, the phase fraction increased to 5.05, 5.76, 7.14 and 7.38 %. The increased intermetallic compound increased the driving force for recrystallization and grain refinement. The electrical conductivity of Al-1.0 wt.%RE alloy with Fe addition decreased to 60.29, 60.15, 59.58 and 59.13 %IACS. With an increase in the Fe content from 0 to 0.75 wt.% the ultimate tensile strength (UTS) of the alloy increased from 74.3 to 77.5 MPa. As the mechanical properties increase compared to the reduction of the electrical conductivity due to Fe element addition, it is considered to be suitable for fields requiring high electrical conductivity and strength.

• 한국정보디스플레이학회:학술대회논문집
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• 2009.10a
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• pp.1018-1021
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• 2009

Define a designated eye position (DEP) for the 3D displays is a critical issue. It shows the system performance without content issue. We use luminance meter to capture these optical characteristic and discuss between one point measurement, two points measurement and three points measurement situation.

• Korean Journal of Medicinal Crop Science
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• v.26 no.5
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• pp.408-416
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• 2018

Background: The ginsenosides Rb1 (G-Rb1) and Rg1 (G-Rg1) are used as marker compounds, and are the principal bioactive compounds assessed in the quality control of white ginseng. This study was conducted to analyze white ginseng samples of different and to obtain useful data for the quality control of white ginseng. Methods and Results: The variation in the content of G-Rb1 and G-Rg1 was evaluated among 35 samples of 4-, 5-, and 6-year-old white ginseng. The content of both G-Rb1 and G-Rg1 did not significantly differ among ages, and the relative ratio of the maximum to the minimum content of these within ginseng of the same ages was more than two. However, the ratio of G-Rb1 to G-Rg1 content in the 5- and 6-year-old ginseng was significantly higher than that in the 4-year-old one. According to the 'Ginseng industrial act', the standard (w/w, %) minimum $G-Rg_1$ and $G-Rb_1$ content is 0.10% and 0.20% or more, respectively. Among the 35 samples examined, the content of $G-Rg_1$ was found to be 0.124 - 0.399% with none being less than the standard level, while that of $G-Rb_1$, was 0.147 - 0.595%, with 4 samples (11.4%) failing to meet the standard levels. The content of $G-Rg_1$ and $G-Rb_1$ did not show a constant relationship with the size of ginseng. Conclusions: In our study, the content of both G-Rg1 and G-Rb1 varied widely, and there was no significant difference among cultivation ages. The results of the present study might provide useful information for the quality control of raw ginseng and processed white ginseng using marker compound.

• Proceedings of the Korea Society of Design Studies Conference
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• 2005.05a
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• pp.168-169
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• 2005

• International Journal of Internet, Broadcasting and Communication
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• v.15 no.4
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• pp.326-331
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• 2023

Korea's cultural content industry can develop into another unique tourism industry. However, since other prior studies focus on the Japanese content industry, this study identifies modern industrial trends by combining the unique characteristics of Korean content, that is, cultural content tourism, and the analysis ability of big data. The current status and direction of the cultural content tourism industry were studied by utilizing the extensive information collection and in-depth analysis capabilities of big data, and as a result, it was confirmed that the trend of the cultural content industry is related to the business aspect of cultural content, not the pure content interest of cultural content. This shows that Korean cultural contents have a strong business aspect. As a limitation, when research design was conducted using social media big data, the age, gender, etc. of the subject analyzed with unique anonymity could not be known. The Korean cultural content industry is expected to be successful in terms of business.