Black box-assisted fine-grained hierarchical access control scheme for epidemiological survey data

Xueyan Liu,Ruirui Sun,Linpeng Li,Wenjing Li,Tao Liu 한국인터넷정보학회 2023 KSII Transactions on Internet and Information Syst Vol.17 No.9

Epidemiological survey is an important means for the prevention and control of infectious diseases. Due to the particularity of the epidemic survey, 1) epidemiological survey in epidemic prevention and control has a wide range of people involved, a large number of data collected, strong requirements for information disclosure and high timeliness of data processing; 2) the epidemiological survey data need to be disclosed at different institutions and the use of data has different permission requirements. As a result, it easily causes personal privacy disclosure. Therefore, traditional access control technologies are unsuitable for the privacy protection of epidemiological survey data. In view of these situations, we propose a black box-assisted fine-grained hierarchical access control scheme for epidemiological survey data. Firstly, a black box-assisted multi-attribute authority management mechanism without a trusted center is established to avoid authority deception. Meanwhile, the establishment of a master key-free system not only reduces the storage load but also prevents the risk of master key disclosure. Secondly, a sensitivity classification method is proposed according to the confidentiality degree of the institution to which the data belong and the importance of the data properties to set fine-grained access permission. Thirdly, a hierarchical authorization algorithm combined with data sensitivity and hierarchical attribute-based encryption (ABE) technology is proposed to achieve hierarchical access control of epidemiological survey data. Efficiency analysis and experiments show that the scheme meets the security requirements of privacy protection and key management in epidemiological survey.

A Convenient Method to Prepare Novel Rare Earth Metal Ce-Doped Carbon Nitride with Enhanced Photocatalytic Activity Under Visible Light

Ruirui Jin,Shaozheng Hu,Jianzhou Gui,Dan Liu 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.1

Graphitic carbon nitride (g-C3N4) doped with the rare earth metal Ce was prepared by a simple method using melamine and Ce(SO4)2쨌4H2O as precursors. X-ray diffraction (XRD), UV-vis spectroscopy, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), photoluminescence (PL) spectroscopy, and X-ray photoelectron spectroscopy (XPS) were used to characterize the prepared catalysts. The results indicate that the introduction of Ce inhibits the crystal growth of g-C3N4, decreases the bandgap energy, and increases the separation efficiency of photogenerated electrons and holes. The activities of Ce-doped g-C3N4 catalysts were tested in the photocatalytic degradation of rhodamine B (RhB) under visible light. The rate constant of Ce-doped g-C3N4 is 2.1횞 that of neat g-C3N4. A possible mechanism is proposed.

Effect of government R&D subsidies on firms’ innovation in China

Wu Ruirui,Liu Zhiying,Ma Chaoliang,Chen Xiafei 기술경영경제학회 2020 ASIAN JOURNAL OF TECHNOLOGY INNOVATION Vol.28 No.1

This study investigates the effects of R&D subsidies on firms’ innovation using panel data of Chinese listed firms from 2008 to 2013. Through propensity score matching method, we determine that recurrent, high-tech firms are more likely to receive public grants. Moreover, firms affiliated with higher-level governments and located in minimally marketised regions have a higher probability of receiving government financial support. China's state intervention to correct market failure related to firms’ R&D activity is confirmed to be reasonable in an observable time given an instantaneous additionality effect. However, the stimulation effect of R&D subsidies on innovation outputs has not been verified. Results obtained through a continuous matching method show no optimal amount of R&D subsidies for firms in China, but a declining yet a positive marginal effect of treatment has been identified given an increase in the amount of R&D subsidies.

High Temperature Plastic Deformation Constitutive Equation of a New Alloy for Piston Ring

Dejin Wei,Ruirui Liu,Chengkun Zuo,Haitao Zhou 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.6

Hot compression tests of a new CrMoV alloy for piston ring are conducted by Gleeble-3800 thermal mechanical simulationtester at the temperature of 950, 1000, 1050, 1100 and 1150 °C and strain rate of 0.01, 0.1, 1, 10 s−1. The results show thatthe true stress strain curves first go up to peak, and then go down to steady state in accord with characteristics of dynamicrecrystallization, indicating that the main softening mechanism of this alloy during hot deformation is dynamic recrystallization. The hot deformation behavior of this alloy is characterized by Arrhenius hyperbolic sine relationship with theactivation energy and stress index. On the basis of the true stress strain curves, the constitutive equation of the peak flowstress of this alloy is established. With the equation, the flow stress of this alloy can be predicated by numerical simulationfor a new type piston ring.

Effect of Asymmetric Rolling on the Microstructure, Mechanical Properties and Texture Evolution of Mg–8Li–3Al–1Y Alloy

Xiao Zhou,Ruirui Liu,Qiang Liu,Haitao Zhou 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.5

Asymmetric rolling was applied to dual phase Mg–8Li–3Al–1Y alloy with different speed ratio and rolling reduction. Withincreasing reduction at the same speed ratio the population of β-Li grains decreased with a feature of fibered grains alongthe rolling direction. As for different speed ratio under the same reduction, β-Li grains kept equiaxed, but α-Mg phase wasfirst elongated and fibered and then transited to equiaxed small grains. The enhanced yield strength and tensile strengthwere achieved with the increase of rolling reduction and speed ratio. In particular, when speed ratio reached to 1:1.3 underthe same rolling reduction (30%), the optimal mechanical properties were obtained. As for texture evolution, we found thebasal texture was obviously weakened and some new weak texture was formed after asymmetric rolling. Interestingly, it wasnoted that the texture on the side of slow roll is distinct from that on the side of the fast roll due to the different rolling speed.

Vanadium phosphorus oxide catalyst: Progress, development and applications

Muhammad Faizan,Ruirui Zhang,Ruixia Liu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.110 No.-

With the increasing awareness of carbon neutrality, the global warming issue has been well addressed forthe reduction of carbon emissions into the atmosphere. Enormous amounts of carbonaceous gaseousbyproducts have already been released into the atmosphere especially after the start of industrial revolutionin the last century. Most industrial processes releases low carbon alkanes directly into the environment. Among them petroleum refinery units generate low carbon alkanes especially n-butane as gaseousbyproducts. In recent decades, n-butane has been used as a reagent to generate important valuable chemicalssuch as maleic anhydride with the support of vanadia catalysts. The complex vanadium phosphorusoxide exists in the nature in almost fifteen different phases. Each one has distinguished structural morphologyand chemical composition, and exhibits particular physiochemical characteristics such as surfaceacidity, lattice oxygen, surface oxygen, valance state, P/V ratio, V+4/V+5, surface to lattice oxygen ratio,etc., which are highly dependent on the precursor preparation and catalyst activation conditions. Researchers believed that either the addition of various promoters/cocatalysts/metals-dopants, or introducingnew preparation techniques such as microwave irradiation, ultrasound, ball milling, barothermal,calcination, sol–gel method electrospinning, hydrothermal and solvothermal synthesis can be used forthe improvement of the catalytic selectivity and activity. Aforementioned different aspects are describedin the current review along with the description of reaction kinetics and reaction mechanism. Additionally, we have also highlighted the important industrial issues such as air/n-butane pretreatment,deactivation, water supplement, phosphorus supplement, and the strong exothermic reaction, which areinfluencing the overall catalytic performance.

Microstructure and Texture Evolution of Rolled Plate for Cu–15Cr In-Situ Composite

XuDong Wu,LvQi Zhu,RuiRui Liu,HaiTao Zhou 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.11

The microstructure and texture of different rolling processes in situ Cu–15Cr sheets are studied. The results show that thesecond phase Cr in the material gradually become broken, flattened, merged and homogenized from dendritic state to orientedthin lath. Meanwhile, the texture in distributed copper matrix grains finally forms Brass {110}<112>, Goss {001}<110>and Copper {112}<111> textures along with Cr phase texture of randomly distributed α-fiber (<110> fiber) and γ-fiber(<111> fiber) texture. Based on VPSC (visco-plastic self-consistent model), the texture of cold rolled Cu–15Cr compositeis simulated, and the simulation result indicates that obvious twinning effect in the copper matrix appears with a feature ofa special texture evolution law of Goss.

Characterization of Microstructure and Mechanical Properties of Mg–8Li–3Al–1Y Alloy Subjected to Different Rolling Processes

Xiao Zhou,Qiang Liu,Ruirui Liu,Haitao Zhou 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.6

The mechanical properties and microstructure evolution of Mg–8Li–3Al–1Y alloy undergoing different rolling processeswere systematically investigated. X-ray diffraction, optical microscope, scanning electron microscopy, transmission electronmicroscopy as well as electron backscattered diffraction were used for tracking the microstructure evolution. Tensile testingwas employed to characterize the mechanical properties. After hot rolling, the MgLi2Alprecipitated in β-Li matrix due to thetransformation reaction: β-Li → β-Li + MgLi2Al + α-Mg. As for the alloy subjected to annealed hot rolling, β-Li phase wasclearly recrystallized while recrystallization rarely occurred in α-Mg phase. With regard to the microstructure undergoing coldrolling, plenty of dislocations and dislocation walls were easily observed. In addition, the microstructure of alloys subjectedto annealed cold rolling revealed the formation of new fresh α-Mg grains in β-Li phase due to the precipitation reaction. Themechanical properties and fracture modes of Mg–8Li–3Al–1Y alloys can be effectively tuned by different rolling processes.

《幽明錄》單音節名詞同義詞群考察

李占平(Li Zhanping),劉??(Liu Ruirui) 동아인문학회 2013 동아인문학 Vol.26 No.-

YouMlingLu is an important works of mid-ancient Chinese language.On the basis of the same sememe,different pronunciation and same the characteristic,we concluded 55 groups monosyllabic noun synonyms. After observation and study, we found that 51 groups succeeded to ancient times, 3 groups appeared in mid-ancient and 1 group came from ancient times with subtle changes.Study on words of classic books is important and practical .By means of this kind of study,we can know Vocabulary features and the changes of a specific period of time.

Facile and controllable synthesis of nitrogen self-doped chitosan-derived carbon for high-performance Li-ion batteries

Xia Wentao,Cheng Miao,Hu Jing,Liu Qianqian,Wei Tao,Wang Ruirui,Li Wanfei,Liu Bo 한국탄소학회 2024 Carbon Letters Vol.34 No.1

N-doping content and configurations have a significant effect on the electrochemical performance of carbon anodes. Herein, we proposed a simple method to synthesize highly N self-doped chitosan-derived carbon with controllable N-doping types by introducing 2ZnCO3·3Zn(OH)2 into the precursor. The as-synthesized NC-CS/2ZnCO3·3Zn(OH)2 electrode exhibited more than twice the reversible capacity (518 mAh g−1 after 100 cycles at 200 mA g−1) compared to the NC-CS electrode, superior rate performance and outstanding cycling stability. The remarkable improvement should be mainly attributed to the increase of N-doping content (particularly the pyrrolic-N content), which provided more active sites and favored Li+ diffusion kinetics. This study develops a cost-effective and facile synthesis route to fabricate high-performance N self-doped carbon with tunable doping sites for rechargeable battery applications.