• Applied Biological Chemistry
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• v.8
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• pp.65-73
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• 1967

For the study of method for salt elimination aimed at reforming tidal land into normal paddy fields in a short period with reduction of periods requiring for elimination of saline, CHP (a kind of Ca-hum ate), a soil conditioner made of peat as a main material was tried. In the pot experiment, effect on elimination of salt, improvement of physical-chemical characteristics and rice cultivation test were studied. The results of these tests are as follows: 1, CHP treatment somewhat improves aggregation state with some effect on aggregation. 2. CHP treatment is remarkably effective in permeability which increases with 1.0 percent treatment by three times in percolation rate, and by 4.5 times in volume of leached water respectively. 3. With the increase of CHP amounts, salt was eliminated in short period. When 80% of the total Na was leached in 1.0% CHP-A treated pot, control pot begins permeable. 4. CEC and phosphorous absorption capacity are not influenced by CHP treatment. 5. Growing state of rice is greatly influenced by rainfalls. Growth of rice in tidal land however are almost similar to those in normal paddy fields with layer amounts of CHP treatment. With salt content in the soils, saline hazard and numbers of ineffective stems, amounts of unmatured grain are increased. 6. With the treatment of CHP yields of rough rice were increased. With 0.5% CHP treatment the yields were similar to those of the normal paddy fields. With 1.0% CHP-A treatment, the yields were increased by 15 times more than those of none treated soil and by 25 percent more than normal paddy soils.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.11 no.1
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• pp.145-151
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• 1991

The final purpose of this study is to examine the uses of coal ash, by-product from thermal power plant as a type of filling-embankment materials and the reuses of ash ponds. In this time, to investigate the dynamic properties, we made the test piece specimen with coal ashes, and obtained the damping ratio. In place(ash pond), the damping property by underground wall was investigated before and after soil improvements. The damping ratio of coal ash test piece specimen of 12% cement is the highest and that of 9% cement or chemical grout, that of 6% cement is in order. In same coal ash test piece, the damping ratio increases with decreasing the void ratio. In conclusion, it could be said that the damping ratio increases with the stiffness of materials. In the ash pond, the damping effect is the most when trench is set through the vibration wave propagation course, and when soil is improved the higher stiffness of the improved soil is, the more damping effect appeared. It is justified to obtain not only the dropping of permeability and the strength increase, but also the damping effect fairly by soil improvements.

• Journal of Sericultural and Entomological Science
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• v.46 no.1
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• pp.12-17
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• 2004

New triploid mulberry cultivar, Suilppong was bred among selected lines from F$_1$ seedlings obtained by crossing the female, artificial tetraploid No. 411 which obtained from Chungilppong seedlings, and the male, Kugsang 21. Local adaptability test has been carried out at four places (Suwon, Kongju, Jeonju and Jangsung) for five years since 1997. Leaf quality was tested by silkworm rearing for two silkworm rearing seasons (spring and autumn) at Suwon in 2000. Suilppong was recognized to be superior in productivity to control cultivar, Kaeryangppong. The new cultivar, Suilppong, has following agronomic characteristics as compared with Kaeryangnppong, which is leading cultivar widely cultivating in Korea. It is belonging to Morus alba L. with mixed shapes from the ovate to 5 lobated leaf shape, sprouting in spring nearly the same to the Kaeryangppong (Morus alba L.), high leaf yielding of 20% compared to Kaeryangppong (Morus alba L.). It is adaptable to everywhere except the places where cold damage occurs frequently in Korea. Suilppong is recommended to rear silkworms not only in spring but also in autumn besides for young silkworms.

• Journal of the Korean Geotechnical Society
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• v.18 no.5
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• pp.43-54
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• 2002

As construction cases of structure are increasing in the soft ground, the necessity of ground improvement is also increasing. Granular pile is one of the improvement methods for soft ground and for loose sandy soil. In domestic, SCP(Sand Compaction Pile) method using sand material has been mainly used to improve soft ground, but Granular pile with crushed-stone was not used much. However, alternative material such as crushed-stone is needed to substitute for sand due to the environmental and economical problems. In this study, staged load test and consolidation test were performed in the laboratory to observe the behavior of soft ground improved by Granular pile. In order to evaluate the characteristics such as bearing capacity, drainage, md settlement, sand and crushed-stone were applied as each pile material. The test results show that crushed-stone has higher bearing capacity and less settlement than those of sand under similar fore water pressure condition. Therefore, crushed-stone is determined to be appropriate as the substitute for sand.

• Journal of The Korean Society of Grassland and Forage Science
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• v.4 no.2
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• pp.108-114
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• 1983

This study was conducted to investigate the effects of existing vegetation on seedling establishment and herbage production of oversown grasses in the Pinus rigida forest. The dominant existing vegetations were Miscanthus sinensis, Festuca ovina, and Lycopodium serratum. In establishment year, seedling stands and herbage production were not affected in Miscanthus sinensis and Festuca ovina, while in Lycopodium serratum it was affected relatively seriously. The pattern of sown species response to the existing vegetations was trend to toward simplified two or three species as Dactylis glomerata, Lolium perenne, and Trifolium repens to advancing the time. Among sown species, Dactylis glomerata was a major dominant species in all existing vegetation area. The content of sown pasture grasses in the sward increased markedly, while the existing vegetations before seeding seriously decreased to advancing the cutting time. The above results shown that the improvement of forest pasture with a surface seeding was better in Miscanthus sinensis and Festuca ovina, but in Lycopodium serratum was found very difficult to improvement of pasture without surface treatment, also establishment method must favor the low herbage production potential.

• Journal of the Korean Society of Food Science and Nutrition
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• v.25 no.2
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• pp.193-198
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• 1996

담즙산과 결합을 하여 콜레스테롤 농도에 영향을 주는 것으로 보고된 대두 단백질의 생체내 효소에 의한 미분해성 분획물 개량 메주로부터 분리하였다. 개량 메주로부터 pH 6.8 과 pH 4.5의 분획물들을 분리하여, 초음파 처리와 투석을 행한 후 Sephadex G-75 column chromatography를 실시하여 부분 정제하였다. 부분 정제된 분획물들을 chemiluminescence 방법에 의해 in vitro에서 검색을 한 결과, pH 4.5 분획물중의 하나가 담즙산과 강하게 결합하는 것으로 밝혀졌다. 또한 대두 기원의 pepsin 비분해성 분획물 또한 pH 4.5 분획물의 chemiluminescence 결과와 일치하였다. 따라서 본 연구에서 고안한 chemiluminescence 법은 in vitro에서 담즙산 결합 활성도 측정 및 콜레스테롤 대사에 관한 연구의 기본적인 연구 수단을 평가되며 따라서 본 연구 결과는 이 분야의 연구에 기초 자료로 제공될 수 있는 가능성을 제시하였다.

• Proceedings of the Mineralogical Society of Korea Conference
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• 2001.06a
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• pp.7-7
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• 2001

다량의 점토 퇴적물로 구성된 연약지반은 대단히 큰 압축성과 낮은 강도, 높은 함수량등의 물리·역학적 특성을 갖는다. 이러한 기초지반으로서의 불리한 특성 때문에 이를 대상으로 하는 각종 토목건설공사에서는 지반개량이나 안정처리가 반드시 선행되어야 할 과제이다. 이를 위해 종래에는 샌드드레인, 페이퍼드레인 등의 물리적인 공법에 의한 지반개량이 주류를 이루었으나, 최근에는 생석회나 시멘트계 고화재를 이용한 화학적 안정 처리공법이 크게 주목을 받고 있어 이에 대한 연구가 활발한 상황이다. 본 연구는 연약 지반 안정처리에 대한 방안을 모색하기 위하여 김해 지역에 분포하는 점토 퇴적물을 대상으로 각종 광물재료를 이용한 반응실험을 통하여 반응생성물 조사와 압축강도시험 등을 행하여 그 결과를 검토하였다. 우선 연약지반의 고화에 이용 가능한 생석회, 석고, 플라이에쉬, 고분자폴리머, 시멘트 등을 사용하여 점토와 혼합한 고화실험을 행하였으며, 이에 대한 물성 및 반응생성물을 검토하였다. 이러한 각 재료를 점토에 혼합한 후 PVC관에 모울딩하여 양생시켜 실험하였다. 그 결과, 석고 및 소석회에 비하여 생석회의 경우가 비교적 큰 압축강도를 나타내고, 균열발생 빈도도 낮았다. 생석회의 경우에 Gehlenite, Hillebrandite 등의 생성물질이 검출되었다. 그러나 포틀란트 시멘트와 혼합한 경우가 강도가 가장 크게 나타났다. 반면에 고분자폴리머만 사용한 경우는 강도가 매우 낮았다. 따라서 시멘트를 일정 비율로 배합한 다른 재료를 첨가한 실험을 행하여 그 물성을 검토하였다 물질의 화학적인 특성을 고려하여 포졸란반응이 잘 일어날 수 있을 것으로 생각되는 여러 재료를 선정하여 많은 조합에 대한 실험을 행하였다. 생석회, 석고, 고령토, 규조토, 제올라이트 등의 여러 재료를 여러 조합으로 첨가하여 실험한 결과, 시멘트와 석고를 혼합한 것이 비교적으로 높은 압축강도를 나타내었다. 그리고 이러한 연구 결과를 바탕으로 연약점도의 고화에 최적인 조합과 배합비를 위한 실험을 재차 실시하였으며, 실험 후의 물성과 함께 반응생성물에 대한 검토도 행하여 그 결과를 발표하고자 한다.

• Korean Journal of Food Science and Technology
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• v.3 no.1
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• pp.52-56
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• 1971

The cooked surf clam meat was treated with BHA or EDTA, and then dehydrated by means of hot-air dehydration or sun drying. The dehydrated products were packed in glass bottle and stored for three months in the dark place. After three month storage, the pigment loss and water absorbing capacity of dehydrated products were compared with those of directly after dehydration. Both of the sun dried and hot-air dehydrated surf clam products showed a great deal of pigment loss during storage. The BHA treatment prior to dehydration of surf clam meat had good effects on the pigment retention, and the EDTA treatment had a weak effect on it during storage. The rate of rehydration of dehydrated surf clam products had markedly decreased during storage. And it could be seen that there was little difference among the rate of rehydration of the BHA or EDTA treated product and untreated one during storage.

• Korean Journal of Food Science and Technology
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• v.3 no.1
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• pp.48-51
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• 1971

The raw surf clam meat was pretreated with BHA, EDTA or $NaHSO_3$. The pretreated meat was chopped with chopper, and spread the chopped meat on nylon net, and then dehydrated with cabinet type hot air dryer. In the surf clam meat flake process, the pretreating and the copping steps prior to final dehydration improved the pigment retention and texture of the products. The chopping steps prior to dehydration reduced the dehydration time of surf clam meat. The BHA treatment prior to dehydration of mashed surf clam meat had an outstanding effect on the pigment retention during a process of dehydration and storage. The surf dam meat flakes reabsorbed water more rapidly about two times than the dehydrated natural surf clam meat products. The surf clam meat flakes stored for three months in the dark place showed less pigment loss than the exposed ones, and the former reabsorbed water more rapidly than the latter.

• Korean journal of applied entomology
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• v.34 no.1
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• pp.75-81
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• 1995

To reduce crop damage from root-knot nematode, Meloidogyne spp. chemical, cultural, physical control methods were compared in commercial greenhouse for 3 years from 1992 to 1994. Timing of sol exchange for economic losses due to the nematodes is important: every 3 years for coarse sand (Masatto) and every 4 years for red-yellow soil. Control effects on Meloidogyne spp. in cucumber were 78.2% in Dazomet DP, 72.1% Carbo G+Soil reverse+submergence, and 66.3% in Carbo G+submergence. Pesticide effects were temporally different after treatment: 77.7~80.6% in 20 days and 33.7~49.5% in 60 days. Cropping system in oriental melon gave an excellent control effect of 81.1% at oriental melon/rice culture. All methods controled root-knot nematodes at the time of the treatment but the number of the nematodes increased at the end of the season. However, soil exchange was effective for 3 years. The most economic control practice is rotation with rice for every three years.