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金容煥,河浩成,李昇揆,金成泰,羅又禎,閔泳鳳 慶尙大學校 1980 論文集 Vol.19 No.1
An instrument for measuring cone penetration using the strain gage system was devised. The soil hardness of given soils under different conditions can be measured and compared by using this instrument. The soil hardness is a very useful index for making decisions in various aspects of the field and laboratory use; the workability of the agricultural machinery on the given field, and the uniformity of soil hardness of the stuffed soil in the soil bin which is tilled repeatedly. The performance of this newly devised cone penetrometer was compared with the conventional one through the field test. The summarized results are as follows; 1. In case of KM-1 type cone penetrometer, the newly devised one, the relation between the cone index and the strain indicated are as follows, Ci=0.026642ε₁-0.4173 when base area is 3.23㎠ Ci=0.013342ε₂ when base area is 6.45㎠ 2. The KM-1 type cone penetrometer is more convenient than conventional one in view of its accuracy and its adaptability of the self recording system. 3. Cone index increases gradually as penetrating depth into the soil is increased. Its maximum value appeared at the depth of about 20cm and then the cone index decreases until the cone reaches the depth of 40cm. It is assumed that such increase of cone index is caused by the existence of plow pan in paddy fields. 4. When cone penetrometers are manually penetrated into the soil deeper than 20cm from ground surface, its found to be difficult to carry out measuring operations due to high soil resistance to penetration. So, in order to use cone penetrometers below the depth more than 20cm, some equipment is necessary to maintain uniform penetrating speed of the cone. 5. Under the same soil conditions, the relation between Cik and Cic, cone indexes derived KM-1 type from conventional cone penetrometers respectively, was as follow;??
金榮福,金容換,李昇揆,金成泰,羅又禎,閔永鳳,朴重春,崔東烈 慶尙大學校 1991 論文集 Vol.30 No.2
The effects of the material properties of thermal curtains upon reduction of the greenhouse heat loss were studied. A theoretical analysis procedure with equations and computer programs was developed to estimate them by using energy balance principles. Curtain effectiveness for every three kinds pf value level of the material properties were studied and compared. The results of this study would be useful for the developent and management of greenhouse thermal curtains.