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Evaluation of soil-concrete interface shear strength based on LS-SVM
Zhang, Chunshun,Ji, Jian,Gui, Yilin,Kodikara, Jayantha,Yang, Sheng-Qi,He, Lei Techno-Press 2016 Geomechanics & engineering Vol.11 No.3
The soil-concrete interface shear strength, although has been extensively studied, is still difficult to predict as a result of the dependence on many factors such as normal stresses, surface roughness, particle sizes, moisture contents, dilation angles of soils, etc. In this study, a well-known rigorous statistical learning approach, namely the least squares support vector machine (LS-SVM) realized in a ubiquitous spreadsheet platform is firstly used in estimating the soil-structure interface shear strength. Instead of studying the complicated mechanism, LS-SVM enables to explore the possible link between the fundamental factors and the interface shear strengths, via a sophisticated statistic approach. As a preliminary investigation, the authors study the expansive soils that are found extensively in most countries. To reduce the complexity, three major influential factors, e.g., initial moisture contents, initial dry densities and normal stresses of soils are taken into account in developing the LS-SVM models for the soil-concrete interface shear strengths. The predicted results by LS-SVM show reasonably good agreement with experimental data from direct shear tests.
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Jae Sik Yu,Se Yun Jeong,Chunshun Li,Taehoon Oh,Mincheol Kwon,Jong Seog Ahn,Sung-Kyun Ko,Yoon-Joo Ko,Shugeng Cao,Ki Hyun Kim 대한약학회 2022 Archives of Pharmacal Research Vol.45 No.2
Phenalenone derivatives sourced from fungi arepolyketides that have attracted signifi cant interest becauseof their diverse chemical structures and potential bioactivities. As part of our ongoing quest to discover novel naturalproducts with biological properties from diverse naturalresources, three unreported phenalenone derivatives ( 1–3 ),named ent -12-methoxyisoherqueinone ( 1 ), (−)-scleroamide( 2 ), and (+)-scleroamide ( 3 ), together with four known phenalenonederivatives, ent -atrovenetinone ( 4 ), isoherqueinone( 5 ), herqueinone ( 6 ), and ent -peniciherquinone ( 7 ) wereisolated from the Hawaiian soil fungus Penicillium herqueiFT729, collected on the Big Island, Hawaii. Compounds 2 and 3 were enantiomers, which were separated using achiral-phase HPLC column, which provided optically purecompounds 2 and 3 . The structures of the novel compoundswere established by extensive spectroscopic analyses,including 1D and 2D NMR and high-resolution ESIMS. Their absolute confi gurations were determined using quantumchemical electronic circular dichroism (ECD) calculations. The inhibitory activity of the isolated compounds( 1–7 ) against indoleamine 2,3-dioxygenase 1 (IDO1) wasassessed. Compounds 1, 5–7 inhibited IDO1, with IC 50values of 32.59, 36.86, 19.05, and 24.18 μM, respectively. These fi ndings demonstrated that the phenalenone derivatives1 and 5–7, as IDO1 inhibitors, are promising anticancerimmunotherapeutic agents.
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