• Journal of Microbiology
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• v.34 no.4
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• pp.316-319
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• 1996

Mycelia of Streptomyces viridochromogenes grown under different pH were analysed for the fatty acid composition. The low relative proportion of 12-methyltetradecanoic acid and the high relative proportion of palmitic acid were characteristic for the young culture under slight acidic pH that caused delay of the aerial mycelium formation. The addition of L-arginine to the culture medium enabled an arginine auxotroph with bald phenotype to have the fatty acid composition similar to that of the wild type and to develop aerial mycelium. The ratio of 12-methyltetradecanoic acid to palmitic acid might be used as a parameter to explain the optimum grwoth in the respect of membrane fluidity.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2003.11a
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• pp.49-52
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• 2003

The objective of this study the mechanical characteristics of prefoamed lightweight foamed concrete using the mineral foam agent which has high lightness, and strength. The compressive strength of lightweight foamed concrete using mineral foam agent are about 2 times degree high those the of lightweight foamed concrete using vegetable foam agent. Lightweight foamed concrete was able to obtain the result of 50kg/㎠ or more compressive strength, when was unit weight 0.8t/㎡. In the case of the same unit weight of concrete, it is influenced by w/c of foam agent ratio. The paper present extensive data on characteristics of compressive strength of the concrete manufatured with the different factors in mix design and also present optimum mix proportion.

• Journal of the Korea Furniture Society
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• v.27 no.3
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• pp.165-174
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• 2016

To modularize the joints of Hanok, the bending strengths of butterfly joints between pre-cut and manual member were compared. Structural size joints were manufactured and the length, width and thickness of each tenon were produced with different sizes. The ultimate load of pre-cut members was 2 times higher than that of manual members. Degree of anchorage for the joints on pre-cut member was also superior to that of manual member. By the F-test results, a great influence between ultimate load and sizes of tenon was found. In result of multiple regression analysis, the length and thickness of tenon were showed proportion relationships with the ultimate load, but the width of tenon was showed inverse proportion with the ultimate load. The results of this study can be used to identify the relationships among the major influence factors. Futhermore, it might be used as basic data for modularization the joints of Hanok.

• Magazine of the Korean Society of Agricultural Engineers
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• v.43 no.3
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• pp.66-76
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• 2001

Recently the use of the antiwashout underwater concrete with the antiwashout admixture is increased considerably. Antiwashout underwater concrete is quite different in concept from conventional underwater concrete. By mixing an antiwashout admixture with concrete, the viscosity of the concrete is increased and its resistance to segregation under the washing action of water is enhanced. The aims of this research is statistically evaluated to mix proportion factor of antiwashout underwater concrete. Experiment was performed to analyze the influence variables(cement, water, and antiwashout admixture) on fundamental characteristics of antiwashout underwater concrete. The influence variables can be considered for use in a wide range of underwater work where their have statistically significant effect on the characteristics(fluidity, filling ability, resistance to washout, etc.) of antiwashout underwater concrete.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2003.05a
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• pp.49.1-52
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• 2003

The objective of this study the mechanical characteristics of preformed lightweight foamed concrete using the mineral foam agent which has high lightness, and strength. The compressive strength of lightweight foamed concrete using mineral foam agent are about 2 times degree high those the of lightweight foamed concrete using vegetable foam agent. Lightweight foamed concrete was able to obtain the result of 50kg/$\textrm{m}^3$ or more compressive strength, when was unit weight 0.8t/$\textrm{m}^3$. In the can of the same unit weight of concrete, it is influenced by w/c of loan agent ratio. The paper present extensive data on characteristics of compressive strength of the concrete manufactured with the different factors in mix design and also present optimum mix proportion.

• Journal of Fisheries and Marine Sciences Education
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• v.22 no.4
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• pp.553-565
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• 2010

The paper aims to evaluate the quality of fisheries census statistic and to provide some desirable directions and improvements for the future fisheries census, conducted by the Government. For the quality diagnosis of fisheries census statistic, specific processes of fisheries census and statistical qualities of each dimension are surveyed and evaluated by a Government's practician, two external examiners and a research group. Results show that census design, data analysis and quality control are evaluated relatively low in specific processes, and accessibility and comparability are evaluated relatively lower than relevance, accuracy, timeliness and consistency in statistical qualities. For minimizing the sampling errors, the probability proportion method should be employed in sampling methods from currently simple sampling method. In addition, fisheries census statistic is desirable to include and compare with those of different countries for consumer oriented data system.

• Journal of Families and Better Life
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• v.20 no.1
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• pp.65-73
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• 2002

The purpose of this study was to describe 1) the prevalence of caregiving among adult men and women in Korea and 2) the characteristics of caregiving context. The main results were as follows: 1) About 1 in 6 adults reported that they provided care for the relatives and friends during the previous year. 2) The proportion of male to female caregivers was similar, indicating a higher prevalence of male involvement than previous studies indicated. Yet, the relationships to care recipients and types of care were found to be different by gender of caregiver 3) Adult caregivers are most likely to provide care for the elderly, but continue to provide care for younger persons as well. 4) A nontrivial proportion of the respondents reported providing care for more than one person, suggesting the need to pay special attention to these multiple caregivers.

• Journal of the Korean Home Economics Association
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• v.41 no.3
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• pp.17-30
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• 2003

The purpose of this study was to explore the difference mother-child verbal interaction between wordless and narrative picture book. Forty-two 4-year-old middle class children(21 girls and 21 boys) and their mothers were observed in their home. Major findings were as follows: 1) Mothers' verbal interaction strategies shows difference according to the genre of the book. Mothers used more descriptive statement, descriptive questions, inferential statements, evaluative statements and elaborative feedback when sharing the wordless book than the narrative book. 2) Children differently interact when reading picture books of different genres. Children used more descriptive statements, inferential statements and elaborative feedback. 3) Compared with the narrative picture boot mother and child engaged in more turn-taking when reading the wordless picture book. 4) While the proportion of collaborative type was higher when reading the wordless boot the proportion of passive type was higher when the narrative book.

• Journal of Information Technology Services
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• v.11 no.4
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• pp.69-85
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• 2012

This paper analyzes how IT adoption affects differently on the shippers' make-buy decision, depending on the changes through agency and coordination problems. Empirical findings are consistent with the theoretical predictions on the changes of shippers' decision, summarized as follows. First, while the adoption of agency-cost reducing IT leads to the increase in the proportion of private fleets, the adoption of coordination-cost reducing IT leads to the increase in proportion of for-hire carriage. Second, the extent of private fleets changes depends on the primary product type that trucks load, with products of important service task experiencing more increase. Third, the extent of for-hire carriage changes depends on the truck's trip distance, with long-trip trucks experiencing more increase. With the results, we present different policy implications from the conventionally advocated ones.

• Computers and Concrete
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• v.21 no.6
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• pp.705-715
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• 2018

This paper presents an experimentally investigation pertinent to the mechanical properties of rubberized mortar (RM) with styrene-butadiene rubber (SBR). The SBR were used with constant water-to-cement ratio of 0.485 and two different volume proportion of SBR particles were utilized as aggregates. One types of SBR particles with fineness modulus of 4.951 were utilized 0%, 10%, and 20% of aggregate volume. Effectiveness of SBR replacement ratio, curing and aging effect on the compressive strength, flexural strengths as well as load-displacement. Compressive and flexural strength of concrete were investigated at the end of 28-days and 56-days age. Obtained results demonstrated that utilization of SBR reduced the flexural strength of SBR mortar at the earlier curing age while SBR increased. Moreover, mechanical properties of mortar mentioned above were significantly affected by the water cure timing with an increasing proportion of the replacement level of SBR.