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Prediction of characteristic blast-induced vibration frequency during underground excavation by using wavelet transform

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Frontiers of Structural and Civil Engineering 2022年第8期16卷 1029-1039页

作者： Tae Un PAK guk rae jo Un Chol HAN Faculty of Mining Engineering Kim Chaek University of TechnologyPyongyang 999093Democratic People’s Republic of Korea School of Science and Engineering Kim Chaek University of TechnologyPyongyang 999093Democratic People’s Republic of Korea

Blast-induced vibration produces a very complex signal,and it is very important to work out environmental problems induced by *** this study,blasting vibration signals were measured during underground excavation in carbonaceous shale by using vibration pickup CB-30 and FFT analyzer ***,wavelet analysis on the measured results was carried out to identify frequency bands reflecting changes of blasting vibration parameters such as vibration velocity and energy in different frequency *** characteristics are then discussed in view of blast source distance and charge weight per *** analysis of results,it can be found that peak velocity and energy of blasting vibration in frequency band of 62.5–125 Hz were larger than ones in other bands,indicating the similarity to characteristics in the distribution band(31–130 Hz)of main vibration *** frequency bands were affected by blasting source distance,and the frequency band of 0–62.5 Hz reflected the change of charge weight per *** presenting a simplified method to predict main vibration frequency,this research may provide significant reference for future blasting engineering.

关键词： wavelet analysis blast-induced vibration frequency characteristics underground excavation

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The Anti-Inflammatory Effect of Cheongseoikki-Tang Ethanol Extract on Allergic Reactions Mediated by Bone Marrow-Derived Mast Cells

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Chinese journal of Integrative Medicine 2013年第5期19卷 380-386页

作者： joon-Ho Keum Ok-Hwa Kang Sung-Bae Kim Su-Hyun Mun Yun-Soo Seo Ma-Ryong Kim Jung-rae Rho Young-Seob Lee Chung-Berm Park Young-guk Kim Yong-II Kim sin-Hee Han Dong-Yeul Kwon College of Pharmacy and Wonkwang Oriental Medicines Research Institute Wonkwang UniversityJeonbuk(570-749)Republic of Korea Department of Oceanography Kunsan National UniversityKunsan(573-701)Republic of Korea National Institute of Horticultural & Herbal Science RDAEumsung(369-873)Republic of Korea

Objective： Cheongseoikki-tang （CIT, Korean）, also called Qingshu Yiqi decoction（清署益气汤）and Seisho-ekki-to （Japanese）, is well known as an effective traditional combination of herbs for treating cardiovascular diseases. This study was to research its effects on bone marrow-derived mast cell （BMMC）-mediated allergy and inflammation mechanisms. Methods： In this study, the biological effect of Cheongseoikki-tang ethanol extract （CITE） was evaluated, focusing on its effects on the production of allergic mediators by phorbol 12-myfistate 13-acetate （PMA） plus calcium ionophore A23187 （A23187）-stimulated BMMCs. These allergic mediators included intedeukin-6 （IL-6）, prostaglandin D2 （PGD2）, leukotfiene （34 （LTC4）, and β-hexosaminidase （13-hex）. Results： Our data revealed that CITE inhibited the production of IL-6, PGD2,/TC4, and 15-hex induced by PMA plus A23187 （P〈0.05）. Conclusion： These findings indicate that CITE has the potential for use in the treatment of allergy.

关键词： Cheongseoikki-tang ethanol extract bone marrow-derived mast cell allergy interleukin-6 prostaglandin D2 leukotriene C4

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