• Journal of Microbiology and Biotechnology
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• v.12 no.3
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• pp.444-448
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• 2002

A $CaCO_3$-alginate beads system was developed for high cell density cultivation of Bifidobacterium longum and the cost-effective media were also screened. In batch process with $CaCO_3$, beads, two strains of B. longum showed both the highest viable cells and optical density in TPY medium, resulting in maximum optical density and viable cell counts of 12.40, $2.22{\times}10^10$ cfu/ml for B. longum ATCC 15707 and 13.71, $3.93{\times}10^10$ cfu/ml for B. longum HLC 3742. Released size distribution, according to $CaCO_3$-alginate bead size preparation, was smaller than others. These results were also examined by observing their morphology. The skim milk-based medium was most adequate to cultivate B. longum as the cheapest medium, and $10\%$ skim milk supplemented with $2\%$ glucose and $1\%$ yeast extract was a suitable medium, supporting the growth to $5.57{\times}10^10$ cfu/ml for ATCC 15707 and $6.82{\times}10^9$ cfu/ml for HLC 3742. During the long-term storage at $4^{\circ}C\;and\;-20{\circ}C$, B. longum cultivated with $CaCO_3$ beads had the highest stability. Consequently, $CaCO_3$-alginate beads buffer was found to be useful not only to cultivate B. longum but also to preserve cultures.

• Journal of Korean Society of Steel Construction
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• v.23 no.4
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• pp.493-501
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• 2011

The $45^{\circ}$cone failure theory has been used for concrete anchor bolt design, but the CCD (concrete capacity design) method was adopted as a new design method in 2000. The method was allowed to be used, however, only for anchors with a diameter of less than 50 mm and an embedment depth of less than 635 mm because it is based on the experiment results from medium-sized to small anchor bolts. Therefore, it is necessary to develop a rational concrete breakout capacity equation for medium-sized to large anchor bolts. In this study, tension tests on an M56 cast-in-place single anchor bolt with an effective embedment depth of 400-450 mm were carried out for the five test specimens. Based on the test results together with the other recent test results, the applicability of the concrete breakout capacity equation in the current design code to the large to medium-sized anchor bolts with an embedment depth of 280-1,200 mm was estimated.

• Korean Journal of Optics and Photonics
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• v.14 no.6
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• pp.663-668
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• 2003

We studied a localized hologram recording method that can be used in a disk-shaped medium. In this method, the reference beam is focused by use of a cylindrical lens to get a thin spot in the medium, and then a hologram is recorded in that spot by illuminating the signal beam. Many localized holograms are multiplexed by shifting the medium by a distance more than the thin spot size of the reference beam. This method does not need recording-time scheduling for uniform diffraction efficiencies. We show that a minimal required thickness of the recording medium exists for a given spot size of the signal beam. We performed experiments for data storage and retrieval, and obtained a storage density of 20 bits/${\mu}{\textrm}{m}$$^2$ and a raw-bit error rate (RBER) of 2.5${\times}$10$^{-3}$ , when a 2 mm-thick Fe-doped LiNbO$_3$ crystal was used.

• Animal Systematics, Evolution and Diversity
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• v.14 no.4
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• pp.327-334
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• 1998

Four external and 27 cranial characters of three subspecies of striped field mice (Apodemus agrarius) from 15 regions in far eastern Asia(South Korea, North Korea, northeastern China, and far eastern Russia) were analyzed by multivariate methods in order to determine taxonomic status of striped field mice from North Korea. Three subgroups were recognized: a large-size form from two localities in South Korea(Cheju Island, Wando Island): a medium-size form from eight localities in South Korea and North Korea(Jindo Island, Kunsan, Mt. Chirisan, Cheongju, Mt. Weoleksan, Mt. taebaksan; Haeju, Sineuiju); a small-size form from five localities in North Korea, northeastern China, and far eastern Russia (Mt. Kumkangsan, Mt. Myohyangsan; Jirin, Yichun; Vladivostok). It is confirmed that the large-size form, the medium-size form, and the small-size form are subspecies chejuensis, coreae, and manchuricus, respectively, as noted by Koh et al.(1997). It is revealed that striped field mice(the medium-size form) from western region of North Korea (Haeju, Sineuiju) is classified into A. agrarius coreae, as noted by Thomas(1908), but striped field mice(the small-size form) from eastern region of North Korea(Mt. Kumkangsan, Mt. Myohyangsan) is A. agrarius manchuricus.

• Economic and Environmental Geology
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• v.19 no.spc
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• pp.227-237
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• 1986

The Duk-Eum mine located in Kongsan-myeon, Naju-gun, Cheolanamdo is producing silver ore mainly, with rare gold association. The grade-up and recovery of the concentrates have been concerned to the main problem. And then, this study aimed at applying the basic data for ore processing. In the first half of the study, the attempts were made to identify the ore minerals, this followed by determination of the mineral texture, paragenesis, grain size, and size distribution by employing the microscopical method and the etching test. The results of the study are as follows: 1. The ore deposit is composed of the hydrothermal fissure linked veins, and filling cavities are mostly tensile fractures or joints, in rhyolitic rocks as a wall rock. 2. The principle ore minerals are native silver, acanthite, canfieldite, pyrargyrite, galena, tetrahedrite, sphalerite, pyrrhotite, chalcopyrite, chalcocite, covellite, zincite, and the gangue minerals are quartz and calcite. 3. The grain size of each ore minerals before grinding are; max. $2\frac{1}{2}$ mesh, medium 48-100 mesh(main size, contained over 80%), min. 3200mesh. And the grain size of each ore minerals after grinding is; max. 42mesh, medium 65-250mesh(main size, contained over 80%), min. 3200mesh. 4. The properties of the mineral texture effected on the ore dressing are follows; a) Inclusion texture; the fine grains of chalcopyrite is included in most acanthite, and rarely, that of galena included in acanthite. b) Exsolution texture; pyrargyrite is exsolved in acanthite. c) Replacement texture; native silver replaced pyrargyrite, and acanthite replaced galena. d) Interlocking paragenetic texture; the interlocking paragenetic minerals are pyrite, chalcopyrite, chalcocite, canfieldite. e) Fissure filling texture; chalcopyrite was filled along the cracks in acanthite. Among of the above texture, it is impossible to liberate the grains of a), and more difficult to liberate those of b) and c), while easy to liberate those of d) and e).

• Animal Systematics, Evolution and Diversity
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• v.7 no.2
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• pp.179-188
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• 1991

In order to determine the taxonomic status of Apodemus agrarius chejuensis from Cheju island in Korea, three hundred and eleven samples of eight subspecies of striped field mice (subspecies, agrarius, ningpoensis , pallidior, chevrieri, insulaemus, manchuricus, coreae, and chejuensis of A. agrarius Pallas) in Asia, collected from Turkey , China, Taiwan, , Manchuria, and Koarea, were used. Four external and 27 cranial characters were measured and their measurements were utilized for multivariate analyses such as cluster, principal component, and discriminant analyses. Four forms were revealed . A largest-size from was chejuensis, whereas a large-size form was cheverieri. A medium -size from and a small-size from were coreae and other five subspecies (agrarius , ningpoensis, pallidior, insulaemus, and manchuricus) , respecitvley, but their differences were clinal. A discontinuous gap was revealed between chejuensis (a largest-size from) and six subspecies ( a medium-size from and a small-size form) Although chejuensis appeared to be a distinct species, it is concluded that molecular analyses are necessary in order to describe it as a new species.

• Journal of the Korean Dietetic Association
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• v.26 no.2
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• pp.153-173
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• 2020

The purpose of this study was to objectively quantify the effects of nutrition and dietary life education on preschoolers through meta-analysis. In addition, it provides basic data for the implementation of nutrition education and development of systematic nutrition and dietary life education programs. In this study, a meta-analysis of 27 papers was conducted that conformed to the selection criteria in the study conducted from January 2012 to August 2019 to derive objective data on the effects of education. As a result of the analysis, the overall effective size of nutrition and dietary life education for preschoolers was 0.829, which indicates a strong effect. According to the education method, the effect size of general education was 0.562, which indicates a medium effect size, the vegetable playing-based experience education was 0.685, which indicates a medium effect size, and cooking activity-based experience education was 1.101, which indicates a large effect size. Judging from this result, experience activity education was more effective than general nutrition education. In addition, the combined size of convergence education conducted through a combination of general and experience education was found to be the most effective at 1.301. In terms of educational effect, it was confirmed that the effect size was 0.898 for improving nutrition knowledge, 0.858 for improving dietary habits, 0.836 for improving unbalanced diet, and 0.756 for improving food preference and intake, and the sizes of effects were all found to be large. As frequency of education increased, the number of education participants decreased and the effect of education increased.

• Journal of the Korean Society of Clothing and Textiles
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• v.35 no.11
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• pp.1346-1361
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• 2011

This study examined the body characteristics, perceived body size and body-cathexis according to the stature of women aged 18 to 59. Special focus was on women of short stature; in addition, the study searched for the proper clothing fit and satisfaction level for short women. The 2010 SizeKorea data of 2,586 women aged 18 to 59 was analyzed statistically to find the distribution of stature according to 4 age groups along with the body characteristics and proportion of 3 stature groups in each age group. A questionnaire was conducted with responses from 412 women aged 18 to 59, and the perceived body size and satisfaction with body size of 3 stature groups were studied with 5 Likert scales. Although the stature of Korean women has increased, short stature women (those under 155cm) still represent a high percentage of individuals in Korea. Short women (small in height and length) had unique body characteristics in width, depth, and girth that were distinguished from the characteristics of medium or tall women. Especially, the lower body part of short women had distinct characteristics. Accordingly, it is undesirable to reflect the same ease or same body proportion in clothing construction for the 3 stature groups. Short women perceived their stature and length of upper or lower body as too short and the satisfaction with their body size was lower than medium or tall women. To upgrade the clothing fit and satisfaction of short women, it is necessary to reflect the unique body characteristics of short women in clothing design and construction.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.9
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• pp.5897-5905
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• 2015

This paper investigates the differentials in productivity and growth performance between small and medium size and large size firms in Korean manufacturing industries. According to the empirical analysis based on the Mining and Manufacturing Survey of Statistics Korea, this paper finds the following facts. First, the level of contribution of capital deepening on the growth rate of output(value added) is relatively greater in the small and medium size firm group, while the level of contribution of total factor productivity on the growth rate is relatively greater in the large size firm group. Second, the productivity polarization among the firms has increased relatively greater in the large size firm group over the past decade.

• Journal of Bio-Environment Control
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• v.12 no.2
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• pp.83-88
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• 2003

The effect of vertical stratification of perlite by particle size on the growth and yield of tomato In a recycling hydroponics was examined. Vertical stratifications were composed of mixed form of small medium and large size (MP), divided forms of small and large size (smal1/1arge, DP I), and medium and large size (medium/large, DP II). Tomatoes showed higher growth in divided form, specially in DP II than DP I. Deformed fruits had higher occurrence by 17.8% in the mixed form than divided forms, while they were not significantly different between mixed forms. Root activity tended to increase during 20 days to 50 days after transplanting (DAT) in all treatments, but showed highest value at 50 DAT in DP II. After harvest electric conductivity and pH of stratified perlite were slightly higher in upper zone of DP I, but were not different in the other treatments. Mineral contents in the medium after harvest were higher in lower zone than the upper zone in MP and DP II, but vice versa in DP I.