The design of buried underground flexible pipes proposed in domestic standards does not properly reflect changes in ground characteristics. Overseas standards suggest that pipe deflection must be considered while designing them. Therefore, in this study, the structural behavior of underground polyvinyl chloride pipes was investigated through experiments and the finite element analysis. In addition, when the pipe deflection occurred at 3% and 5%, the hydraulic characteristics of the polyvinyl chloride pipe showed a slight difference compared to the round pipe.

This study was carried to investigate the effect of illite addition on the growth, bioactive components andvolatile compounds of leaf on Saururus chinensis Baill cultivation in greenhouse. Illite addition on Saururus chinensis Baillcultivation resulted no significant effects on the aerial part. However, the root part was highest in 5% illite addition group.Crude oil and ash amount increased as illite additives was increased. Ca of inorganics and free sugars contents were highestin 5% and 20% illite addition, respectively. Hyperoside and isoquercetin of available component on leaf were highest in 5%illite addition group, 4.02㎎/g and 4.31㎎/g, respectively. The volatile compounds in Saururus chinensis Baill leaf culturedwith illite addition amounts were isolated by solid-phase microextraction fiber (polydimethysiloxane 65㎛) and identifed bygas chromatogtaphy mass spectrometry. As the results, the 22 volatile compounds were identified from in Saururus chinen-sis Baill leaf and major volatile compounds were the α-cadinol (18.50%), myristicin (16.46%), methyl-9-methyl-tetrade-canoate (10.22%), and γ-muurolene (9.75%). Especially, the content of α-cadinol was highest in 5% illite addition group andγ-muurolene on overall illite addition group was lower than no addition group.