• Geotechnical Engineering
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• v.12 no.3
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• pp.17-34
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• 1996

The objective of this paper is to evaluate the asphalt mixture performance with pyrolyzed carbon black(CBP) and air -cooled iron blast furnace slag. Marshall mix design was performed to determine the optimum binder content, The optimum binder content ranged from 6.3 percent to 7.75 percent. Dynamic creep testing was carried out using mixtures at the optimum binder content. Based on the test results, the use of pyrolyzed carbon black and slag in the asphalt pavement showed a positive result, such as the increase of Marshall stability, the decrease of the strain rate and the decrease in the mix stiffness rate at high temperature(5$0^{\circ}C$) and 137.9 kPa confinement. Within the limits of this research. it was concluded that pyrolyzed carbon black as an additive and slag as a coarse aggregate could be used to produce an asphalt paving mixture that has good stability, stiffness, and rutting resistance.

• Korean Journal of Ecology and Environment
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• v.41 no.3
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• pp.412-421
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• 2008

Nutrient limitation was examined for the Dongbak Lake based on bioassay experiments and analyses of long-term monitoring data. From the results of data analyses, molar ratios of TN/TP and DIN/DIP were higher than 16 : 1 suggesting that phytoplankton growth was potentially limited by phosphorus. Phytoplankton responded to the addition of phosphates in the incubation experiments for all seasons whereas phytoplankton did not respond to other nutrients such as ammonia, nitrate and silicates. Size fraction (net and nano size) of phytoplankton also responded to the addition of phosphorus indicating that phytoplankton growth was limited by phosphorus in the Dongbok Lake. There was also a taxonomic shift from euglenophyceae to bacillariophyceae after addition of phosphate during warm season especially.

• Journal of Fashion Business
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• v.15 no.4
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• pp.144-154
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• 2011

Polygoum tinctoria dye is the one using the method of reducing dyeing, and so is made by the mechanism different from natural dye in general, and the reproductive dye is more difficult because it varies in accordance with manufacturing method and days being manufactured in case of natural indigo dye that has been used traditionally. In addition, overall analysis is short of color changes in accordance with natural dyeing condition and barely none of the research for cellulose system such as cotton in particular. Accordingly, this study tries to research on the natural dyeing method optimal for color development that is desirable in designing and development of natural dyeing as comparing and contemplating the change of dyeing quality and color in accordance with reduction temperature and time, reductant quantity, dyeing temperature and time, NaOH quantity, and dyeing repetition times in order to expand dyeing methods and use variously polygoum tinctoria by improving traditional dyeing methods as well as to establish exact dyeing method of cotton which is a fabric of cellulose system in order to make such polygoum tinctoria quantificated and reproductive. The optimum conditions in the dyeing procedure are as follows: Reducing temperature is $50^{\circ}C$. Added concentration of the reducing agent is $3g/{\ell}$. Reducing time is 30minutes. Dyeing temperature is $30^{\circ}C$. Added concentration of NaOH is $1g/{\ell}$. Dyeing time is 30minutes.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.15
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• pp.77-83
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• 1974

This experiment was conducted to study the effexts of seeding time and varieties on yield components, protein and oil content of soybean. Four varieties of soybean(Chung Buk Baek, Iksan, Keum doo, Chang dan Baek mok)wrere applied in this experiment and were seeded at May 15th, June 5th, and June 25th, the results obtained are as follows. 1.When the soybean was seeded at May 15th, stem height, stem diameter and number of nodes on main stem came to an end about 70days after seeding. In case that the seeding time was delayed 20 days and 40 days from May15th, respectively, the time to be almost cimpleted the growth of the characteristics was shortened 10days and 20days during ther debelopment. Among varieties, Chung Buk Beak grew faster than any other varieries. 2.When seeded at May 15th, the plants produced many pods, and had high proportion of branch pods. When seeded late, the proportion of branch pods were low. Branches had large proportion of empty pods and one grain pods, but on main stem, the proportion of two grain pods and three grain pods were more than that of branch. Among varieties, Chung Buk Baek had high proportion of two and three grain pods, Keum doo and Chang dan Baek mok had high proportion of one and two grain pods, and Iksan had high proportion of one and three grain pods. 3.Tields were less by the late seeding.The proportion if decreased yields to the yields when seeded at May 15th, that of Chung Buk Baek was decreased 6% when seeded at June 5th and 14% when seeded at June 25th, that of Ik san was decreased 9% and 17%, that of Keum doo decreased 15% and 26% and that of Chang dan Baek mik decreased 18% and 27%. 4.Protein content was highest in the plots seeded on May 15th, but oil content was highest in the plots seeded in June 25th. Among varietiesm Xhang dan Baek mok had the highest proportion of protein content and Iksan had the highest of oil content.