含水比 및 密度變化에 따른 흙의 工學的 性質

宋錫銀 진주산업대학교 1975 論文集 Vol.13 No.-

This study was made to investigate various engineering properties of earth materia1s resulting from their changes in moisture content and density, The results obtained in this study are summarized as follows: 1. Even in the same density, the coefficient of permeability is smal1er in wet than in dry from the optimum moisture content, 2. In case of most soils, a dry condition is better than wet condition to give a compactive effort, 3. In general, the soil which has high optimum water content has lower coefficient of permeability than low optium water content, 4. The coefficient of permeability has a certain relations with density and gradation, it increase with increasing of saturation degree.

開墾地의 耕耘整地및 丞水路作業에 關한 硏究

宋錫銀,洪鐘浩 진주산업대학교 1979 論文集 Vol.17 No.-

It is necessary to develop and supply special equipment suitable for reclaimed area agriculture in accordance with the progress of agricultural mechanization. But it is more worth while to consider how to effectively use the machinery such as tractors and power tillers which have already been supplied for reclaimed area agriculture. Thus we have carried out an experiment to study the working rate slope and safety of the machine frame when this machinery is used in the area. 1. Plowing working rate of bottom plough was 35.8 minute per 10 ares on the 6 slope and 47.6 minutes on the 10 slope. These working rates were lower. than those of flat land by 44% and 33% respectively. Working rates of disc harrow on the 6 and 10 slopes were 55-76% of the working rates at the flat land. In case of power tiller, working rates on slopes were about 35-58% of those an float land. 2. Harrowing working rates on the Rotavator was 18.5 minutes per 10 ares on the 6 slope and 22.01 minutes on the 10 slope. 3. The working rate of making catch canals was 18.8 minutes per 50m of catch canal when a disc harrow was used on the 6 slope. 4. The real slope of the tractor body in the plowing operation in accordence with the different land slope is almost the same when plowing by bottom plough or plowing by disc plow. However, considering the overturn of tractor on the steep slope and the proliferation of roots it is better to plow by disc plough than by bottom plough. 5. During ploughing operation in the sloping area, the inclination of the tractor with bottom plough was more than that of the tractor equipped with disc harrow and for power tiller it was more with rubber tire than with cage wheel. 6. It was found that the steeper the slope is, the more was the slip of the tractor, or power tiller and the slip to the contour direction was more in conparition to the slip occured to the direction of the slope.

경지정리답에서 이앙기의 작업능률에 관한 고찰

송석은,신영철,김태규 진주산업대학교 1995 산업과학기술연구소보 Vol.- No.2

경지정리후 경과년수와 써레작업후 경과일수 및 경심의 변화에 따른 이앙기의 주행상태를 조사하여 적정포장조건을 규명하고져 경지정리답(1, 2년)에서 실험을 실시한 결과를 요약하면 다음과 같다. 1. Cone index는 경지정리 경과년수가 길어질수록 토양이 안정되었고, 써레작업후 경과일수와 차륜침하에 따른 관계는 직선적으로 나타났다. 2. 구동토오크는 경지정리 경과년수와 써레작업후 경과일수가 길어질수록, 차륜침하가 적을수록 감소하였으며, 엔진탑재마력에는 충분한 여유가 있어 이앙기의 주행에는 크게 지장이 없을 것으로 생각되었다. 3. 슬립율은 경지정리후 2년구에서 16%로 가장 낮게 나타났으나 차륜의 침하 깊이가 클수륵 높게 나타났으며 써래작업후 결과일수가 증가할 때는 감소하였다. This study was carried out to investigation the work efficiency of transplanter according to the various elapsed years after land rearrangement and days after pudding and sinkage of transplanter. The results are summarized as follows ; 1. The relationship between cone index of wheel sinkage and the various elapsed years after land rearrangement and days after pudding appeared in a straight lined. 2. The pracitical work power for the various elapsed(1993 yera) after land rearrangement was about lps, which was the hightest among the plots, so the loading power(2.5~2.5ps) of these engine is considered to be enough for the trasplanting under these field conditions. 3. The percentage of splip was lowest(16%) in the various elapsed years(1994 year) after land rearrangement and was small as the wheel sinkage depth decreased and was diminished as the dlapsed days after pudding increased.

고차전단변형을 고려한 크로스-풀라이 적층판의 좌굴해석

송석은,이원홍 진주산업대학교 1997 산업과학기술연구소보 Vol.- No.4

Upto date, the buckling modes of the laminated composite plate have been studied in considering to the first-order shear deformation theory because these theory was used to easily obtain the bucking modes of them in classical theory. But the mechanical properties of laminated composite plate is quite different from those of the singe-layered isotropic structures. This study presents higher order shear strains are used to consinder the shear effects in order to obtain the more accurate solutions and to determine the buckling loads. In general, a higher-order shear deformation theory requires no shear correction coefficients and avoids considering shear, locking phenomenon. In this study, the parabolic distribution of the transverse shear and rotationary inertia moments through the thickness of the structures is taken anounts for. The buckling loads in the present study are shown the more exact values than those in existing study by the first-order shear deformation theory and/or the classical theory.

韓國의 土壤浸蝕에 關하여

宋錫銀 진주산업대학교 1980 論文集 Vol.18 No.-

8,053,248㏊ 85.8% of the South Korea has been surveyed analytically and the important reult abtained was as follows. 1. The erosion occur in less in the region where condition of scrub type forest vegetation is good. 2. The area of waste land and development land are 15% with 947,518.16㏊, but the Volume of soil erosin is 42.5% with 6,008,866.77 ton.

土地利用狀態에 따라 推定되는 土壤浸蝕

宋錫銀 진주산업대학교 1976 論文集 Vol.14 No.-

1,017,840 ha 90% of the kyung-Nam province has been surveyed analytically, and the important results obtained are as follows. 1. 8,483.83 ha of the kyung-Nam province is potential conversion land. 2. 13,163.69 ha desolated land (GL_1,GL_2,EPM) in this province requires gully contral, and 55,087.73 ha developed land (L,LB,LR) requires soil consevation contral. 3. 75.5% of kyung-Nam province is upland, becaus this province in mountainous area. 4. The erosion occured less in the region where condition of scrub type forest vegetation is good. 5. The area of waste land and development land are 9% with 68,251.42 ha but the volume of soil erosion is 41.6% with 774.679 ton

韓國 農業機械의 變遷 過程

宋錫銀,朴魯奭 진주산업대학교 1968 論文集 Vol.2 No.-

1.The mechanization of agriculture in Korea can not be achieved in a short period of time. 2.The agricultural machinery available in Korea is in process of being motorized from nam powered machinery 3.The mechanization of agriculture can reduce labour efficiency, increase yields, and modernize the farm villages.

灌漑用 小溜池의 內容積에 關한 硏究

宋錫銀,周栽洪,李裕根 진주산업대학교 1982 論文集 Vol.20 No.-

Obtained results for study as above are as follows. 1. The unit depth of water of the present state of reservoirs was below 160 millimeter on the average. 2. The frequency of drought happened one time per three years. 3. The ratio of a well irrigated paddy field was less than 40%. 4. When the unit depth of water of reservoirs is at least 300 millimeter, it is regarded as a well irrigated paddy field. 5. If possible technically, when we raise the present state of dam height of reservoirs more than 1 meter, we can store up the irrigation water for somehow 20 days.

유한 요소법에 의한 크로스-플라이 복합적층판의 해석

송석은,이원홍 진주산업대학교 1998 산업과학기술연구소보 Vol.- No.5

In general, cross-ply laminated compostie plates exhibit properties considerably different from those of the single-layer plate. The great difference in elastic properties between fiber and mtrix materials leads to a higher ratio of in-plane Young`s modulus to transverse shear modulus for laminated composite plates. Thus, to obtain the more accurate solutions to laminated composite plate problems, effcets of shear strain should be considered in analysis of them. The purpose si to expend the first-order shear deformation theory by Finite Element Analysis and to clarify the cross-ply laminated composite plates.

農業用水로써 地下水 利用度에 關한 硏究

宋錫銀,鄭鳳守 진주산업대학교 1972 論文集 Vol.10 No.-

319 tube wells of 437 tube wells were examined in the quantity of collecting underground water. The results obtained were as follows 1. Initially the quantity of collecting water from tube wells was 256,050㎥ a day being able to irrigate on 1,707 ha, but at present it was only 16,550 ㎥ a day being able to irrigate on 777 ha. 2. Efficiencies of the quantity of collecting water were different from the installing methods of tube wells Mechanical boring tube wells had 89 percent, Hammer digging tube wells 73 percent, and manual digging tube wells 39 percent Manual digging tube wells was the worst of three. 3. Succesful tube wells over 100 percent of the quantity of collecting underground water were only 12 site. 4. Generally speaking effectiveness of a tube well project was nothing but 45.5 percent.