• Journal of Korean Society of Steel Construction
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• v.12 no.2 s.45
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• pp.177-185
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• 2000

An experimental research to evaluate the slip coefficients of high-strength friction-type bolt connection of weathering steel plate has been performed in this paper. The test specimens with mill scale or shot blast had been exposed in open air during 3 and 6 months and cleaning of rust surface by hand brushing, power tool brushing and no cleaning was considered. The relaxation of bolt clamping force had also been measured during 600 hours. It was found that slip coefficients increased to the value over 0.6 with exposure except mill scale surface by power tool brushing. The relaxation of bolt tension force in exposed specimens also increased and maximum value reached to about 10%.

• Journal of Conservation Science
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• v.25 no.2
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• pp.161-169
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• 2009

The objective of this study was to investigate stability of Korean Paper(Hanji) which is being sold in the Korean markets according to aging treatment. In order to know the aging characteristics, the optical and mechanical properties of before and after wet and dry-heat aging treatment were examined. The optical and mechanical properties were shown higher reduction in the dry-heat aging treatment compared to the wet-heat aging treatment. The Soonji (pure mulberry Hanji) made from black mulberry bast pulp was shown a great reduction of the brightness and whiteness, and increase of the opacity in the aging treatment. On the other hand, in case of mechanical properties, the breaking length of Soonji made from white mulberry bast pulp was significantly higher than that of the others, and the tensile strength was shown drastic reduction in according to Soonji made from black mulberry bast pulp in the aging treatment. The burst strength of Soonji made from black and white mulberry bast pulp was shown the similar value in the wet-heat aging treatment. The folding endurance of Soonji made from white mulberry bast pulp was significantly higher than that of others before and after aging treatment. Consequently, Hanji was affected sensitive in the temperature compared to the humidity. Meanwhile, the density and color of the chinese ink was no significant changes before and after wet and dry-heat aging treatment.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 1999.08a
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• pp.236-241
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• 1999

The characteristics of the deterioration and oxidation of high speed steel(

• Journal of Korean Society of Steel Construction
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• v.12 no.2 s.45
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• pp.167-175
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• 2000

An experimental research to evaluate the slip coefficient of high-strength slip-critical-type bolt connection of weathering steel plate has been performed in this paper. Experiments were performed with several surface conditions such as clean mill scale with hand or power brush cleaning, shot blast cleaned, inorganic zinc primer coated, and weather coated surfaces. Also, the relaxation of bolt clamping force was estimated during 500 hours. It was ascertained from the experiments that slip coefficients are greater than 0.40 in all faying surface conditions except mill scale surface with power brushing. The quantify of relaxation depended on the surface conditions and was $3{\sim}8%$, i.e., less than 10%.

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 2011.04a
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• pp.121-124
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• 2011

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 2011.10a
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• pp.213-216
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• 2011

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.43 no.4
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• pp.59-66
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• 2011

This study was carried out to develop the automation bark peeling process of paper mulberry for making Hanji. Nowadays, almost raw material has been imported from south-east asia for making Hanji. Raw material dependence is very high for Hanji-making by low productivity in korea. This study is focused on the resolution for problem of bark peeling automation. Water and sand jet of compressed air was possible bark peeling for black bast fiber. The effect of removing black bast fiber increased the longer the steaming time. Also using drum of bark peeling showed that results under temperature $80^{\circ}C$ and Rpm 50/min were best bark peeling and separating bast fiber from stem. The contents of holocellulose, lignin, ethanol-benzene extractives, and ash were 91.63~95.55%, 1.4~2.0%, 1.12~1.65%, and 1.4~4.3%, respectively. Chemical characteristics are similar between imported raw-material with drum bark.

• Korean Journal of Food Science and Technology
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• v.2 no.1
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• pp.121-126
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• 1970

The utilization of soybean milk has lasted for past several thousand years, mostly in Orient as a Precious food or as a substitute for cow's milk. There are several hundred varieties in soybean that is called Glycine max Merryl There are three typical varieties, Yellow, Black and Green. However, these are due to pigment in soybean cuticle while their chemical constituents are similar (Table 2). Soybean milk is constituted of protein, fat and carbohydrate of soybean, and these constituents are extracted by hot water. Thus becomes emulsion which is highly digestible and nutritious for human diet. However, it was not found any report on the water extractability comparison between two different varieties Black cuticle soybean which is common in India and Yellow cuticle soybean which is common in Korea. Also there was no report on the comparison on the yield and organoleptic quality derived by varied process. Also several attempts were carried out to improve nutritional value as well as acceptability by use of food additives. A model of continuous soybean milk plant was introduced.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.45 no.3
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• pp.36-44
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• 2013

This study is focused on the debarking and xylem separation yield of Paper Mulberry. We investigated the most efficient manual on the automatic debarking and xylem separator machine. The bast tissues of Paper Mulberry were separated in three layers including black outer layer, green inner layer, and white inner layer. A target is to save the white inner layer of these three layers as much as possible. The experimental machine most characterize xylem separation and debarking by frictional force between the bulges and Paper Mulberry by the drum rotation. It is possible automatically to operate the machine by controlling the temperature sensor and the time. Debarking process can be know that removed black outer layer has beem accumulate and measured the weight. The content of the extract, holocellulose, lignin and ashes of the white inner layer was analyzed. It is result that conditions of optimum process of the experimental machine is 45 RPM, temperature at $60^{\circ}C$(60 min.) and $80^{\circ}C$(60 min.), mixing bulge of 10 mm(120ea) and 30 mm(120ea) and capacity of Paper Mulberry 10 kg.

• Journal of the Korean Society of International Agriculture
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• v.23 no.5
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• pp.503-506
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• 2011

In order to analyze the resistant gene to Xanthomonas oryzae pv. oryzae in Korean native rices. Six Korean native rice varieties were crossed with IR-BB 101 contains Xa1 resistant gene and inoculated Japanese isolates IA(T7174). Cheonggunbyeo has Xa1 resistant gene only, and Yukseongjaerae, Agukdo, Heukpi and Icheon7ilchal have Xa1 and another one dominant gene. Ginggaragshare has Xa1 and another two dominant genes and two of those genes concerned complementary interaction against Japanese isolates IA(T7174).