• Journal of The Korean Society of Grassland and Forage Science
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• v.28 no.3
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• pp.203-214
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• 2008

The overwintering crops, barley, wheat, oat and triticale etc, have been received in korea as high-quality roughage for round-baled silage making as livestock feed. Studies were carried out to evaluated the effects of seed blending on growth, yield and feed value between barley and wheat, triticale and oat, respectively. The results are summarized as follows : The barley was declined in the growth and spike's size as affected by sown as mixed seeding with triticale, but not effected with oat. The total fresh yield were increased by grown as mixed seeding with wheat, triticale and oat, but the dry matter yield were not significantly increased because of the low percentage of dry matter and the decrease of barley's growth. The neutral detergent fiber (NDF) and crude protein content were increased by seed blending, but acid detergent fiber (ADF) and digestible dry matter (DDM) content were decreased. The feed value was improved by seed blending of barley and wheat, but not significant at seed blending of triticale and oat. Because of the flourishing tillers, difference of heading date and abundant leaves of oat, the optimum crop for mixed seeding with barley for increment of forage productivity was oat in middle area of korea.

• Journal of the Korean earth science society
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• v.30 no.4
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• pp.401-408
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• 2009

We carried out the Suspension PS log and gamma-gamma log in andesite and sedimentary rocks distributed near the area of Myodo-dong, Yeosu. The main purpose of this study was to find out the distribution of seismic velocities and densities and to analyze the correlation of the two rocks by comparing their geophysical well logs with rock cores. The distributions of P and S-wave velocities for two rocks represented in the study area showed a difference of about 2,000 m/sec and 1,500 m/sec with depth, respectively, while the distributions of densities had a discrepancy of about $0.35g/cm^3$ with depth. However, the results of geophysical well logs analysis were similar to the two rocks. Consequently, it is clear that these results are interpreted as a difference due to weathering rather than rock type. In particular, the RQD values showed a good correlation to geophysical well log data.

• Journal of Korean Society of Forest Science
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• v.95 no.3
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• pp.365-369
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• 2006

This study was conducted to clarity the differences in density and body weight of rodents among unburned and two burned areas (silvicultured and natural restored areas) after forest fire from July to September 2004 in coniferous forest of Samcheok, Korea. The density of rodents was the least in the silvicultured area. There was no differences in density between the unburned and natural restored areas. Also, mean body weight of rodents in the natural restored area was higher than in the silvicultured area. Shrubs, seedlings, snags and CWD (coarse woody debris) would be good for inhabitation of the rodents in forest fired area. Therefore, coverage of understory layer should be maintained in forest fired area.

• Journal of the Korean Wood Science and Technology
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• v.43 no.1
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• pp.1-8
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• 2015

Relationship between annual ring width and physical properties of 24-year old alder woods (Alnus glutinosa L.) that had different seed origins from four provenances such as Bulgary, Italy, United Kindom, and Yugoslavia was investigated. No difference among different origins of seeds was found for the moisture content, density, and shrinkage or tangential radial (T/R) ratio. These properties had also no relationship with the growth rate. As important parameters among wood quality indices, no difference in the density or shrinkage on wood that has different growth rates was detected among alder woods from four different origins of seeds. Therefore, it is considered that higher growth rate might be a key factor for selecting the seed origin of the alder tree.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.52 no.3
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• pp.334-340
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• 2007

A super sweet corn hybrid, "Cambella 90", was grown at 5 plant populations (35,000, 45,000, 55,000, 65,000, 75,000 plants/ha) on 1 April, 1 May, and 1 June in 2004 under black polyethylene (P. E.) film mulch to find out the optimum plant populations at different planting dates. Emergence rate and percent stand increased as planting dates delayed. Culm length and ear height were highest at the planting on 1 May and increased with increased plant population. Soluble solids content was highest at the planting on 1 May and decreased as plant population increased. Ear length, seed set ear length, ear diameter, and ear weight decreased as plant population increased. Seed set ear length could not substitute for ear weight to evaluate marketable ears. The optimum plant population of "Cambella 90" was $65,000{\sim}75,000$ plants/ha at the planting on 1 April when emergence rate was low due to low temperature, $55,000{\sim}65,000$ plants/ha at the planting on 1 May, and 65,000 plants/ ha after the planting on 1 June.

• Korean journal of communication and information
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• v.33
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• pp.53-86
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• 2006

This paper presents comparative analysis of the traits of personal network structure shaping in local press organizations of Korea. For this analysis, this study attempts to investigate three topics. First, the density traits of personal network structure in the whole of local press organization. Second, the comparison of density trait shaping in personal network structure between press section of local broadcasting stations and local newspaper companies. Third, the positional trait in each local press organization. To answer the questions, the data concerning commissioners and executive members in local daily newspapers and local broadcasting organizations from the Civic Government to the People's Government have been collected and analyzed. The interconnections of regional(birthplace) and educational(university graduated) aspect were analyzed via methods of cross analysis, density analysis and correspondence analysis. In brief, major findings of this study are as follows ; As a result of analyzing cross analysis and density analysis of the personal network based of regional and educational aspect, the numerical value of density was too high on the whole of local press organizations. But, especially local newspaper companies has been showed that was higher density compared with press section of local broadcasting stations. And, positional distance between local press organizations were showed obviously in the case of regional(birthplace) aspect. But, in case of educational aspect, positional distance were showed obviously between commissioners and executive members.

• Journal of the Korean Vacuum Society
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• v.18 no.1
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• pp.44-48
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• 2009

The effect of temperature gradient between the substrate and ambient gas on the structural characteristics of GaN nanorods grown on r-plane sapphire substrates by hydride vapor phase epitaxy was investigated. The density, diameter, and length strongly depended on the tempearture gradient. In addition, the cross-sectional shape of the nanorrods at the end of growth was found to be more dependedent on the temperature of a substrate itself than the temperature gradient.

• Journal of The Korean Society of Grassland and Forage Science
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• v.25 no.4
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• pp.239-244
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• 2005

This study was conducted to investigate the effect of the planting densities and nitrogen levels on the growth characteristics, dry matter yield and nutritive value of corn for silage in alpine area(altitude 800m a.s.1.) of National Livestock Research Institute from 2001 to 2002. The experiment was arranged in a split plot design with three replications. Main plots consisted of three planting densities, low(67,000 plants/ha), medium(89,000 plants/ha) and high(95,000 plants/ha). Sub plots consisted of three nitrogen levels, 150 kg/ha, 200 kg/ha, and 250 kg/ha. Tassel height of corn was increased with decreasing planting density, and nitrogen level of 200 kg/ha in all main plots. Ear height of corn was decreased with increasing planting density, and 150 kg/ha of three nitrogen levels. But there were no significant differences among treatment in tassel and ear height. Although dry matter ear ratio of whole com was increased with decreasing planting density, there were no significant differences among treatments. But there were significant differences among nitrogen levels(P<0.05). Dry matter yield of com was high with increasing planting density, but there were no significant differences among treatments. And DM yield of corn was significant difference among nitrogen levels(P<0.05). Crude protein content of corn was the highest with high planting density and low nitrogen level. NDF and ADF content of com was the highest with low planting density and nitrogen levels of 200 kg/ha in all main treatments. These results indicate that low planting density(67.000 plants/ha) and nitrogen of 150-200 kg/ha would be the optimum level fur dry matter yield and nutritive value of silage com in alpine area.

• Proceedings of the Korean Society of Crop Science Conference
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• 1980.05a
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• pp.34.2-35
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• 1980

• Proceedings of the Korean Society of Crop Science Conference
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• 1985.05a
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• pp.30-31
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• 1985