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Submerged Floating Tunnel (SFT) is a new structural concept for crossing water. The purpose of the present study is to develop a dynamic analysis program for SFT and investigate dynamic response characteristics of SFT subjected to external environmental wave load. The structure is modeled with 3-dimensional beam element and the fluid is assumed incompressible, invicid and irrotational and is analysed by boundary element method applying linear potential theory. Using the hydrodynamic coefficients of added mass, radiation damping and wave excitation force obtained by solving 2-dimensional diffraction problem, 3-dimensional structural analysis of SFT is performed in time domain and results are presented. The depth effect of SFT location on the hydrodynamic coefficients are illustrated as well as the effect of the frequency dependency of the coefficients which is taken into account in the analysis program.
In order to develop the clean culture method for soybean sprout culture, ozone water and ozone were treated in the cu1W re of soybean sprout. Soybean seeds were soaked in different concentration of ozone water for 4 hours and then they were sprinkled with ozone water every 4 hour in culture beds kept at 25℃. The pattern of water absorption of soybean was different among varieties. Absorption of water was taken rapidly 6 hours after soaking, and then slowly. It took 2 hours after soaking to reach the 50% absorption of water. After 12 hours soaking, soybean seeds were saturated with water. Germination percentage of soybean seeds soaked was not differed over 4 hours soaking. At least, more than 4 hours in soaking is necessary to the culture of soybean sprout. If water sprinkled on soybean. 3 hours in soaking is sufficient for germination. Optimum temperature for germination after soaking was 20∼25℃. Initial germination rate was higher than control when soaking in ozone water. The proper concentration of ozone water was 0.3ppm. The growth of soybean sprout grown with 0.3ppm ozone water was better than control in whole length, hypocotyl length, and sprout yield. As ozone treated in air, the growth of soybean sprout was shorter than control in length and then hypocotyl was bent.