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Research on MR-Tree Spatial Query Authenticated Index Introduced Neighbor Relationship
Xiaofu Wei,Shenglin Li,Zuofei Tan,Kaiwen Luo,San Zhang 보안공학연구지원센터 2016 International Journal of Database Theory and Appli Vol.9 No.10
In database outsourcing, the data owner delegates the tasks of data management to a third-party service provider. As the service provider may be untrusted or susceptible to attacks, query authentication is an essential part. Merkle R-tree (MR-tree) is one of the most efficient authenticated index that combines Merkle hash tree with R*-tree. MR-tree can provide an efficient range query authentication, however, as it uses the traditional R*-tree query structure in neighbor queries, a large number of unnecessary nodes may be accessed, and that can affect the efficiency of the query. In this paper, the neighbor relationship is introduced into the construction of MR-tree, and we propose a new index structure, called VMR-tree that incorporates the Voronoi diagram into MR-tree. In order to utilize VMR-tree index structure, we propose algorithms for spatial nearest neighbor queries and experiments to verify it has a better efficiency in spatial neighbor query authentication.
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Decoupling Control of Penicillin Fermentation Processes Based on MLS-SVM Inversion
Bo Wang,Xiaofu Ji,Zhikun Zhuang 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.4
Specific to typical multi-variable, strong-coupling and nonlinear penicillin fermentation process, by combination of an inverse system method and a support vector machine theory, a nonlinear robust decoupling control method based on MLS-SVM inversion is proposed. Firstly, a dynamic system model is developed based on material balance relation of fed-batch fermentation process, and existence of inverse system is analyzed. Secondly, an inverse model has been developed offline by use of fitting capacity of MLS-SVM; online correction was made by use of differential evolution (DE) algorithm on the basis of deviation information. Finally, to connect the inverse model and original system in serial into a compound pseudo-linear system, and based on characteristics of pseudo-linear system, introduce internal model controller for closed-loop control of the system. Simulation result shows that such control method can realize dynamic decoupling control of penicillin fermentation process; the system boasts very strong parameter robustness and good resistance against interference
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Tao, Hengcong,Sun, Xiaofu,Back, Seoin,Han, Zishan,Zhu, Qinggong,Robertson, Alex ,W.,Ma, Tao,Fan, Qun,Han, Buxing,Jung, Yousung,Sun, Zhenyu Royal Society of Chemistry 2018 Chemical Science Vol.9 No.2
<▼1><P>The doping of Pd with a small amount of Te can selectively convert CO<SUB>2</SUB> to CO with a low overpotential.</P></▼1><▼2><P>Designing highly selective and energy-efficient electrocatalysts to minimize the competitive hydrogen evolution reaction in the electrochemical reduction of aqueous CO<SUB>2</SUB> remains a challenge. In this study, we report that doping Pd with a small amount of Te could selectively convert CO<SUB>2</SUB> to CO with a low overpotential. The PdTe/few-layer graphene (FLG) catalyst with a Pd/Te molar ratio of 1 : 0.05 displayed a maximum CO faradaic efficiency of about 90% at –0.8 V (<I>vs.</I> a reversible hydrogen electrode, RHE), CO partial current density of 4.4 mA cm<SUP>–2</SUP>, and CO formation turnover frequency of 0.14 s<SUP>–1</SUP> at –1.0 V (<I>vs.</I> a RHE), which were 3.7-, 4.3-, and 10-fold higher than those of a Pd/FLG catalyst, respectively. Density functional calculations showed that Te adatoms preferentially bind at the terrace sites of Pd, thereby suppressing undesired hydrogen evolution, whereas CO<SUB>2</SUB> adsorption and activation occurred on the high index sites of Pd to produce CO.</P></▼2>
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