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벼 잡종초기세대에서 이삭줄기 대유관속 수와 이삭 특성의 분리양상
김광호,안종국,서경인 建國大學校附設農業資源開發硏究所 2001 農資源開發論集 Vol.23 No.-
The segregation modes and the selection efficiency of large vascular bundle(LBV) number and panicle characteristics were measured in three hybrid populations of rice. F_1 plants of the three crosses showed different direction and degree of dominance in vascular bundle number and panicle characteristics. The panicle neck diameter(ND), number of primary branches(PB) and LVB showed a typical normal distribution in F_2. When F_2 plants were divided into two groups up culm length of 90cm, the distribution of LVB number and panicle characteristics were not different between two populations. The selected and non-selected F_3 populations showed no difference in distribution of LVB number and panicle characteristics. However, F_3 populations grouped by culm length of 90cm showed different distributions in LVB and 100-grain weight among six characteristics observed. In F_2 populations, ND showed positive correlationship with PB, LVB number and grain number per panicle(GN). ND was positively correlated with PB, LVB number, GN and panicle length in selected and non-selected F_3 populations.
안광국(Ahn Kwang-Kuk),김재일(Kim Jae-Il),이처근(Lee Cheo-Keun),정태익(Chung Tae-Ick) 대한토목학회 2007 대한토목학회논문집 C Vol.27 No.2
기존의 블록식 보강토옹벽의 경우 블록과 보강재 사이의 연결을 커넥터 등으로 고정시키는 형식으로 보강재와 블록이 일체로 거동하므로 블록 전면부에 응력집중으로 블록균열이나 보강재의 파단파괴가 발생할 수 있다. 본 연구에서는 보강재의 침하를 허용하는 연결시스템을 적용한 침하형 보강토 옹벽의 거동을 평가하기 위하여 원심모형실험을 수행하였다. 실험결과는 연결부의 침하를 허용하지 않는 일반형 보강토옹벽에 대한 결과와 비교 분석하였다. 실험결과, 침하형 보강토옹벽은 80g의 중력수준에서 완전한 파괴상태에 도달하였으며, 일반형 보강토 옹벽은 69g의 중력수준에서 파괴가 발생하여 침하형 보강토 옹벽의 안정성이 우수한 것으로 나타났다. 또한, 침하형 보강토옹벽의 경우, 69g에서 전면판으로부터 0.15H지점에서 발생한 보강재의 인장력은 일반형 옹벽의 1/6~1/2 정도로 평가되었다. The conventional reinforced earth retaining wall has the connector system to fix the reinforcement and block. However, this system may cause the crack of block and the rupture of reinforcement due to the stress concentration near the face of reinforced earth retaining wall. In this study, the new connector system, which is able to allow the settlement of reinforcement, was applied to analyze the effect of connector system of reinforced earth retaining wall. The centrifugal tests for both the conventional reinforced earth retaining wall and reinforced earth retaining wall driving the settlement of reinforcement were performed to compare the results. As a result, reinforced earth retaining wall driving the settlement of reinforcement reached to the failure at 80g-level. In contrast, the conventional reinforced earth retaining wall was collapsed at 69g-level. It means that reinforced earth retaining wall driving the settlement of reinforcement has the stronger stability than the conventional reinforced earth retaining wall. Also, the tensile force on reinforced earth retaining wall driving the settlement of reinforcement was less at the point of 0.15H about 1/6~1/2 than that of the conventional reinforced earth retaining wall.
안광국 ( Kwang Kuk Ahn ),박수범 ( Su Beom Park ),임관섭 ( Gwan Seop Lim ) 충북대학교 건설기술연구소 2012 建設技術論文集 Vol.31 No.2
In this study, the effect of electrolyte concentration was examined to observe the applicability of e1ectroosmosis on soft soil with various concentration of pH. These tests were performed on the ground formed by aqueous with acid(pH6~7), neutral(pH7 ~8) and alkali(pH8~g). In addition, a supply voltage by 10V/m used in c1ecLnx.lsmosis test was constantly supplied and the test was performed by using PBD covered with nano-gcosynthctics, metallic electrodes steel bars and aluminum bars and then tests of settlement, water content, content water, shear strength were compare and analyzed respectively. As a results of electroosmosis test about pH change and type of electrods, the effect of soil improvement was increased by changing pH from alkaline to acidic and it of nano-geosynthetics as electro was higher than metallic electrodes.