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위흡,朴炳益,高大植,姜聲然,金榮浩 全北大學校 1987 論文集 Vol.29 No.-
In order to select the superior race of red pine, some characteristics of individual trees of the three natural population selected from Byonsan area (lower inland parts of Byonsan, higher inland parts of Byonsan, seaside outland of Byonsan) were analyzed and compared with already reported superior population (Chuwang-san, An-Myeon-do, Odea-san). The study also investigated the variation of the wood quality of red pine in Byonsan area. The results obtained are summerized as follows; 1. The seed weight in the three natural populations selected from Byonsan area renged from 6.00g to 11.10g. The weight of seeds from the lower inland parts of Byonsan were the heaviest with an average value of 8.64g. 2. According to the classification based on the straightness of the stem, over 70% of all the natural red pine in Byonsan area were classified as A grade. The trees in the lower inland part showed the highest value in A-grade gopulation with a value over 80%. 3. There was no significant statistical differences among three natural red pine populations selected from Byonsan area, in the clear-length, seed length, seed width, seed weight and serration density. 4. As the above results, the natural red pine population of the lower inland parts of Byonsan, among three natural populations were defined by the superior individual trees. 5. The variation of the moisture content at D.B.H. was increased with an annual ring from the pith and the moisture content with height was increased as the measured point became higher. 6. The specific gravity with annual ring at D.B.H. ascended rapidly from pith to the 7th annual ring. From the 8th annual ring to the bark there was no variation. The specific gravity with its height decreased at the measured point became heighter and the average specific gravity based green wood in Bonsan area was 0.9±0.018. 7. The average shrindage of red pine in Byonsan area showed that the tangential direction was 5.62±0.794% the radial direction was 2.98±0.611% and the longitudinal direction was 0.30±0.96%. The ratio of the shirinkage compared with the tangential, radial and the longitudinal direction was 18.7:9.9:1. The tangential dirction shirinkage was shown 1.89 times more than the radial direction shirinkage. We knew it is comprehensible that in each section the shirinkage in the sap wood was larger than the shirinkage of the heart wood and variation of shirindage with height showed a decrease from the butt end to the top in the radial, tangential and longitudinal direction respectively. 8. We suppose that the tracheid length of the early wood at D.B.H. has no differences among the east, west, south and north directions and became longer while along with annual ring from the pith to the 20th annual ring, but there was no variation from the 20th annual ring to the bark. The variation of tracheid length with height showed sharp rising from the butt end to the point of 3.2m, but showed a decrease gradually from the point of 4.2m to the top of the tree. The average tracheid length of the early wood as 3.05±0.251mm.
고성위(Sung Wi Koh),김형진(Hyung Jin Kim),김재동(Jae Dong Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The effect of load, sliding speed and particle on friction and wear behaviors of side plate materials of FRP ship, which were composed of glass fiber and unsaturated polyester resin(GF/PE composites), were investigated. Friction coefficients of GF/PE composites were increased as sliding speed increase in the wear test. The particle has a significant effect on the friction coefficient under low load, whereas it had no effect on the coefficient when load was high. It could be verified by SEM photograph of fracture surface that major failure mechanisms were microfracture, deformation of resin cutting and cracking.
고성위(Sung-Wi Koh),김병탁(Byung-Tak Kim) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
The hydrostatic slipper bearing is generally used in heavy equipments to support the load generated from two surfaces which are sliding relatively at low speed. The object of the bearing is to remove the possibility of direct contact by maintenance of an adequate oil film thickness between two metal surfaces. Because the bearing performance is influenced by the bearing deformation, it is highly dependent on the injection pressure, the bearing surface profile and so on. In this study, the performance of a hydrostatic slipper bearing is investigated according to the injection pressure by the finite element analysis. In the analysis, the special boundary condition to take the fluid-structure interaction(FSI) into account is used on the interactive surface. The results, such as bearing deformation, stress and lifting force, obtained from the fully coupled analysis are compared with those from the single step sequential method.
고압 피스톤 펌프용 슬리퍼 베어링의 변형 특성에 관한 연구
고성위(Sung-Wi Koh),김병탁(Byung-Tak Kim) 한국해양공학회 2009 韓國海洋工學會誌 Vol.23 No.5
The hydrostatic slipper bearing is generally used in high pressure axial piston pumps to support the load generated from two surfaces which are sliding relatively at low speed. The object of the bearing is to remote the possibility of direct contact by maintenance of an adequate oil film thickness between two metal surfaces. Because the bearing performance is influenced by the bearing deformation, it is highly dependent on the injection pressure, the bearing surface profile and so on. In this study, the deformation characteristics of a hydrostatic slipper bearing is investigated according to the injection pressure by the finite element analysis, In the analysis, the special boundary condition to take the fluid-structure interaction (FSI) into account is used on the interactive surface. The results, such as bearing deformation, stress and lifting force, obtained from the fully coupled analysis are compared with those from the single step sequential method.