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A Group Data Structure for Very Large Multimedia Database
Gao, Wen,Saito, Masao 대한전자공학회 1992 HICEC:Harbin International Conference on Electroni Vol.1 No.1
A data structure extended on B-tree is presented for satisfying a growing application of manipulating concurrent group data in the very large multimedia database. Simulation shows that by the proposed structure and algorithm the operating overhead of reading and writing in the group manipulation is decreased and the efficiency of database storage utilization is increased greatly.
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Gao, Wen,Li, Jianming,Cirillo, John,Borgens, Richard,Cho, Youngnam American Chemical Society 2014 Langmuir Vol.30 No.26
<P/><P>In this work, we introduce a free-standing, vertically aligned conductive polypyrrole (Ppy) architecture that can serve as a high-capacity drug reservoir. This novel geometric organization of Ppy provides a new platform for improving the drug-loading efficiency. Most importantly, we present the first formal evidence that an impregnated drug (dexamethasone, DEX) can be released on demand by a focal, pulsatile electromagnetic field (EMF). This remotely controlled, on–off switchable polymer system provides a framework for implantable constructs that can be placed in critical areas of the body without any physical contact (such as percutaneous electrodes) with the Ppy, contributing to a low “foreign body” footprint. We demonstrate this possibility by using a BV-2 microglia culture model in which reactive oxygen species (ROS) and inducible nitric oxide synthase (iNOS) expression was attenuated in response to DEX released from EMF-stimulated Ppy.</P>
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Gaowen Zhao,Yiqi Hu,Shaomin Li,Zhuo Wang,Mengzhen Guo,Fangzhou Han,Haoran Wang 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.2
Cast-in-situ concrete suffers complicated working conditions in sulfate-rich saline soil areas. Sulfate-magnesium combined attack can be encountered in heavy saline or salty lake areas. This study investigated the degradation process and corresponding mechanisms of cast-in-situconcrete, contaminated by chlorides, partially exposed to sulfate-magnesium combined corrosiveenvironments. Concrete samples were cast and partially immersed in the pre-prepareddistilled water, sulfate or sulfate-magnesium mixed solutions for 12 months. Physical andmechanical properties of concrete samples were continuously measured and recorded duringthe immersion. Sulfate concentration in different depths were measured by chemical titration. SEM, XRD, TG/DTG tests were conducted to analyze the microstructural and mineral propertychanges after corrosion for concrete suffered different corrosion conditions. Results show thatpartially immersed concrete encounters both chemical and physical degradation induced bycorrosive sources. Concrete contaminated by chlorides obviously shows weaker resistanceagainst sulfate attack and the strength development is also negatively affected. Magnesium inthe environments reduces the early strength of partially immersed cast-in-situ concrete whileenhancing the sulfate resistance ability in the later corrosion stage. Magnesium limits thenegative effect of contaminated chlorides on the partially immersed cast-in-situ concrete. Performance of cast-in-situ concrete is different from precast concrete when encounteringdifferent corrosive sources, and thus more attention should be paid on the degradation ofcast-in-situ concrete structures induce by aggressive environments.
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