• Journal of the Korean Society for Advanced Composite Structures
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• v.6 no.2
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• pp.85-90
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• 2015

The finite element stress analysis of large sized rectangular water tank structures made of stainless steel materials is carried out for various combined load cases. The combined load cases for a large size of 5,000ton are further determined using the specification(KS B6283) established from the Korean Standards Association. The changed water capacity due to the size of reservoirs could be heavily dependent for evaluating seismic effects, especially for large reservoirs. For the better numerical efficiency, the rectangular panels are modelled using the ANSYS ADPL module. The numerical results obtained for different load cases mainly show the effect of the interactions between the different load combination and other various parameters, for example, the water capacity, and different stainless steel materials. The structural performance for various load combinations is also evaluated.

• Journal of the Korean Society for Advanced Composite Structures
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• v.6 no.4
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• pp.44-50
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• 2015

The finite element analysis of large sized rectangular water tank structures made of stainless steel materials is carried out for various combined load cases. The combined load cases for a large size of 5,000ton are further determined using the specification(KS B 6283) established from the Korean Standards Association. For the better numerical efficiency, the rectangular panels are modelled using the ANSYS program. The numerical results obtained for different load cases show as follows. In order to resist the snow load, it takes the influence of the gap than the size of the column. Also, in order to resist the water pressure, it shall increase the thickness of the wall. But, increasing the thickness of the wall is considerably less economical. Therefore, the angle with big thickness should be placed right next to the wall.

• Journal of the Korean Society of Clothing and Textiles
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• v.25 no.6
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• pp.1046-1056
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• 2001

For the purpose of standardizing sizing systems for infants and children's clothing, the researchers surveyed 20 different apparel manufacturers in Korea. The apparel production sizing systems used in the industry were analysed. The researchers also compared standard apparel sizing systems developed for infants and children's clothing in Korea. ISO, Japan, and U.S.A. The followings are the results of this study. 1. As survey findings of companies's views about sizing systems, boys or girls sizing system needed to be developed for 3 years old and over. The plus sizes are needed to be developed and children 9 years old and over need the plus size. 2. The body size specification in most sizing systems collected shows that chest circumference was increased 2cm for every infants sizes, and 3cm for boys and girls'sizes, from size 100 to size 130. However, the chest and waist circumference measurements were increased 4 to 8cm for large sizes, from size 130 to size 170. 3. There are similarity and dissimilarity among the standard sizing systems of ISO, Japan(JIS), U.S.A(ASTM), and Korea(KS). The ASTM developed infants'garment sizes for the babies who are 24months old and under. The most national standards, however, developed infant apparel sizing system for the babies under 105cm tall or 4 years old. 4. The range of body measurements covered by boys/girls sizing system were different by the nation. The U.S. system (ASTM) is for boys and girls who are taller than 120cm. The Japanese system(JIS) is for the children who are taller than 90cm.

• The Journal of Engineering Geology
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• v.25 no.2
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• pp.265-272
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• 2015

Finite element analyses were performed on large-sized (>5000 ton) stainless steel circular water reservoirs subjected to earthquake loading for different stainless steel materials. The earthquake load inputs for the analyses were selected by the guidelines in the Korean Standards Association specification KS B 6283. Seismic effects can be heavily dependent on water capacity, especially for large reservoirs. The numerical results show the interactions between the different load combinations and other parameters such as the water capacity and stainless steel materials. Structural performance is also evaluated for the various load combinations.

• Journal of the Korean Applied Science and Technology
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• v.28 no.2
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• pp.135-139
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• 2011

In order to make high-purity ferro-manganese from $Mn_3O_4$ waste dust, the application of aluminothermite process to the reduction of the waste dust was investigated. The mixture from $Mn_3O_4$ dust as metallic source and Al metal powder as the reductant ignited, and reduced with an extremely intense exothermic reaction. The rapid propagation of the aluminothermite reaction occurred spontaneously and stably by ignition of the mixture. The Manganese having some alloy elements emerged as liquids due to the high temperatures reached up to about $2,500^{\circ}C$ and separated from the liquid by their differences of specific gravity. The result of thermite reaction showed the fact that can be obtained high purity ferro-manganese which have over about 90% of manganese content and lower impurities such as C, P, S than those of KS D3712 specification. The recovery of manganese from $Mn_3O_4$ dust was lower level of about 65% than about 75% from manganese ore by electric furnace process, that is due to spatter loss because of its extremely intense thermite reaction. But it will be improved by the process designed to provide CaO as the cooler or to use the Al metal powder having larger particle size distribution.

• Journal of the Korean Institute of Gas
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• v.23 no.4
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• pp.1-9
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• 2019

Large-scale industrial boilers operating at high temperature and high pressure, have a large amount of water, and a large amount of energy is released at the time of explosion. Currently, most industrial boilers use gas fuel such as LNG and LPG, etc. and fuel exists in the same space as equipment, so there is a high possibility of secondary damage such as fire or explosion in the event of a boiler accident. Both special care and management are required to operate the very dangerous equipment that causes casualty 2.51 per accident. For boilers of a certain size or more, the Korea Energy Agency conducts inspections in accordance with the Energy Usage Rationalization Act, KS, and public notice of the Ministry of Industry, Trade and Resources. In this research, based on the results of the inspection, the hazard factorss are configured, and a questionnaire is conducted to the inspector, the equipment manager, the maintenance person, and the person in charge of the manufacturer. We analyzed the results by using AHP (Analytic Hierarchy Process). As a result of analysis, generally recognized hazard factorss are not good management, measurement failure, specification failure, water leak, leak analysis, but connection, welding, scale, and corrosion, etc. are relatively less important. It is judged that the adverse factors that are recognized to be highly important among all groups and careers are already well managed, but less important and adverse factors should be well managed to ensure that the safe usage of the boiler.