• 한국지반공학회논문집
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• 제19권5호
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• pp.253-261
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• 2003

샌드드레인공법(SD공법)이나 고치환율의 샌드콤팩션파일공법(SCP공법)과 비교하여 저치환율SCP공법에 의해 개량된 복합지반의 역학거동은 모래말뚝과 점토지반 양방의 역학적 상호작용의 영향을 보다 현저하게 받는다. 따라서 본 공법의 적용에 있어서 침하저감효과나 모래말뚝 사이의 점토의 강도증가 등을 정확히 평가하기 위해서는 복합지반 내부에서의 모래말뚝과 점토와의 역학적 상호작용을 해명하여야 할 필요성이 있다. 본 연구에서는 저치환율의 모래말뚝이 타설된 복합지반에 대한 일련의 모형실험을 통하여 압밀중에 발생되는 모래말뚝과 점토 각각의 역학거동과 복합지반 내부에 대한 응력분담거동에 대하여 고찰하였다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2004년도 춘계학술발표회
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• pp.197-202
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• 2004

In order to design accurately sand compaction pile (SCP) method with low replacement area ratio, it is important to understand the mechanical interaction between sand piles and clays and its mechanism during consolidation process of the composition ground. In this paper, a series of numerical analyses on composition ground improved by SCP with low replacement area ratio were carried out, in order to investigate the mechanical interaction between sand piles and clays. The applicability of numerical analyses, in which an elasto-viscoplastic consolidation finite element method was applied, could be confirmed comparing with results of a series of model tests on consolidation behaviors of composition ground improved by SCP. And, through the results of the numerical analyses, each mechanical behaviors of sand piles and clays in the composition ground during consolidation was elucidated, together with stress sharing mechanism between sand piles and clays.

• 한국지반공학회논문집
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• 제19권5호
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• pp.301-310
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• 2003

저치환율 샌드콤팩션파일공법(SCP공법)을 합리적으로 설계하기 위해서는 압밀중에 발생하는 복합지반 내부의 모래말뚝과 점토 양자의 상호역학거동을 정확히 파악하고 그 메커니즘을 이해하여야 할 필요성이 있다. 본 논문에서는 저치환율 SCP공법에 의해 개량된 복합지반의 압밀중에 발생하는 역학적 상호작용을 규명하기 위하여 일련의 수치해석을 실시하였다. 수치해석은 탄점소성 압밀 유한요소법을 적용하였으며, 그에 대한 신뢰성은 SCP에 의해 개량된 복합지반의 압밀거동에 대한 일련의 모형실험 결과와의 비교를 통해 검증할 수 있었다. 또한, 수치해석의 결과들로부터 저치환율의 모래말뚝이 타설된 복합지반의 모래말뚝과 점토에 대해 압밀중에 발생되는 각각의 역학거동과 복합지반 내부에 대한 응력분담 메커니즘에 대하여 규명하였다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2005년도 지반공학 공동 학술발표회
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• pp.443-452
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• 2005

The compaction pile methods with low replacement area ratio used sand(SCP) or gravel(GCP) has been usually applied to improvement of soft clay deposits. In order to design accurately compaction pile method with low replacement area ratio, it is important to understand the mechanical interaction between sand piles and clays and its mechanism during consolidation process of the composition ground. In this paper, a series of numerical analyses on composition ground improved by SCP and GCP with low replacement area ratio were carried out, in order to investigate the mechanical interaction between sand piles and clays. The applicability of numerical analyses, in which and elasto-viscoplastic consolidation finite element method was applied, could be confirmed comparing with results of a series of model tests on consolidation behaviors of composition ground improved by SCP. And,through the results of the numerical analyses, each mechanical behaviors of compaction piles and clays in the composition ground during consolidation was elucidated, together with stress sharing mechanism between compaction piles and clays.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2005년도 춘계 학술발표회 논문집
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• pp.788-795
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• 2005

In this study, the progressive failure and creep of the traditional ground anchor structure were decreased and a new ground anchor that can attain the required pull-out resistance even in soft sandy soils with low confining pressure was developed. Ground anchors are classified depending on the kind of stress the grout is subjected. If the grout material is subjected to tension then it is classified as tension anchor while when the grout material is subjected to compression it is classified as compression anchor. The ground anchor that possesses both the tension and compression mechanism mentioned above is known as composition anchor. It is the objective of this study to develope this type of composition anchor. The structure of the newly developed ground anchor was presented. Pull-out test in different types of soil and the behaviour during Pull-out test was also presented.

• 한국응용과학기술학회지
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• 제9권2호
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• pp.181-187
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• 1992

This study was designed evaluate the change of fat content according to cooking methods of ground beef. The results are summarized as follows. 1. The fat content of ground beef is the lowest in boiling cooking method. 2. The fatty-acids composition of ground beef is mainly palmitic and oleic acids. The fatty acids hardly change according to cooking methods. 3. P/S ratio is inclined to increase a bit after cooking than pre-cooking. From all the results obtained in this study it can be conclude that fat content is the lowest in boiling and microwaving cooking methods and fatty acid composition is mainly palmitic and oleic acids.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 추계 학술발표회
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• pp.1623-1629
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• 2008

The purpose of this research is to assess the application of recycled-aggregate that is gained from construction wastes as the material of compaction pile method. At the same time, the development of the new technique rectifies defects of the existing compaction pile method for soft ground improvement. In this research, model tests were conducted for analyzing the effect of the soft ground improvement by porous concrete pile using recycled aggregate. Through the results of the model tests, the behavior of settlement on composition ground with surcharge pressure were elucidated.

• Journal of Forest and Environmental Science
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• 제33권2호
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• pp.122-129
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• 2017

Understanding how future climate conditions will be impact on the biodiversity and species composition is important, because biodiversity becomes more important in environment assessment. To understand the biological changes including diversity and species composition over time (temporal variation within a year), the species diversity and composition of ground beetles were investigated in two well-preserved areas in the Sobaeksan National Park using pitfall traps. In addition, relationships between ground beetles and environmental variables were studied by considering temporal variation. We collected 2,146 ground beetle specimens representing 45 species, and individual-based rarefaction curves indicated that similar species richness was found between Geumseon Valley (GV) and Namcheon Valley (NV). The Bray-Curtis matrix comparisons between study sites were characterized by similar ground beetles sample heterogeneity, while temporal variations in abundance, species richness, and ${\beta}-diversity$ of ground beetles showed rather difference over time according to location of study sites. In GV site, minimum temperature was selected as the best predictor for abundance, species richness, and ${\beta}-diversity$ of ground beetles, while those relationships in NV site were more complicated. In conclusion, our study suggests that understanding the different response of ground beetles to climatic variables related to local habitat conditions is important to predict the effect of climate change on biological communities.

• 한국환경생태학회지
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• 제29권2호
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• pp.200-209
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• 2015

This study was conducted to investigate the distributional characteristics of ground beetles and to provide basis information for biodiversity management including the ground beetles in the Naejangsan National Park area. Pitfall traps were installed throughout 20 sites within Naejangsan National Park during 2008 to 2011 to collect ground beetles. A total of 2,409 collected ground beetles were identified with 35 species belonging to 19 genera of 8 subfamilies. Coptolabrus jankowskii jankowskii, Eucarabus sternbergi sternbergi, and Pterosticus audax were dominant at the core area, while Pheropsophus jessoensis, Synuchus nitidus, Synuchus cycloderus, and Chlaenius naeviger were dominant at the border of the National Park and adjacent to the road or grassland. These differences of dominant species also affected to the similarity of species composition between core and border area, and caused increasing dissimilarities between sites with cluster analysis. Although the result of the present study was a case study using ground beetles, it will be helpful to develop a management strategy of biodiversity conservation in Naejangsan National Park and its surroundings.

• Asian-Australasian Journal of Animal Sciences
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• 제28권8호
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• pp.1095-1104
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• 2015

To evaluate the effects of the pelleting and the addition of sodium monensin on production, the chemical and lipid composition of milk and butter physical characteristics, 4 Holstein dairy cows (135 days of lactation) with an average milk production of 14.7 kg/d, were supplemented with a concentrate containing ground canola seeds. The cows were assigned to a $4{\times}4$ Latin square design with a $2{\times}2$ factorial arrangement of treatments: i) ground maize, soybean meal, mineral and vitamin supplements, and ground canola seeds (CG); ii) CG concentrate with 31.5 mg of monensin added per kg of dry matter (DM); iii) CG pelleted concentrate; iv) CG concentrate with monensin addition pelleted. There was no difference in milk production and composition. The addition of monensin increased milk concentration of polyunsaturated fatty acids (PUFA), the PUFA/saturated fatty acids (SFA) ratio, and omega 6. The pelleting increased the concentration of monounsaturated fatty acids, the PUFA/SFA ratio, and the omega 6/omega 3 ratio, but decreased the concentration of SFA. The association between pelleting and the addition of monensin increased the concentration of conjugated linoleic acids by 46.9%. The physical characteristics of butter were not affected by the evaluated diets. We concluded that the concentrate with 31.5 mg of monensin added per kg DM basis combined with the pelleting improves the lipid composition of milk from Holstein cows that are on pasture and supplemented with ground canola seeds, without changing the production, milk composition, and spreadability of butter.