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A Dynamic Bayesian-Based Comprehensive Trust Evaluation Model for Dispersed Computing Environment
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作者 Hongwen Hui Zhengxia Gong +1 位作者 Jianwei An jianzhong qi 《China Communications》 SCIE CSCD 2023年第2期278-288,共11页
Dispersed computing is a new resourcecentric computing paradigm.Due to its high degree of openness and decentralization,it is vulnerable to attacks,and security issues have become an important challenge hindering its ... Dispersed computing is a new resourcecentric computing paradigm.Due to its high degree of openness and decentralization,it is vulnerable to attacks,and security issues have become an important challenge hindering its development.The trust evaluation technology is of great significance to the reliable operation and security assurance of dispersed computing networks.In this paper,a dynamic Bayesian-based comprehensive trust evaluation model is proposed for dispersed computing environment.Specifically,in the calculation of direct trust,a logarithmic decay function and a sliding window are introduced to improve the timeliness.In the calculation of indirect trust,a random screening method based on sine function is designed,which excludes malicious nodes providing false reports and multiple malicious nodes colluding attacks.Finally,the comprehensive trust value is dynamically updated based on historical interactions,current interactions and momentary changes.Simulation experiments are introduced to verify the performance of the model.Compared with existing model,the proposed trust evaluation model performs better in terms of the detection rate of malicious nodes,the interaction success rate,and the computational cost. 展开更多
关键词 dispersed computing trust evaluation model malicious node interaction success rate detection rate
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A Novel Edge Computing Based Area Navigation Scheme 被引量:1
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作者 jianzhong qi qingping Song Jim Feng 《Computers, Materials & Continua》 SCIE EI 2020年第12期2385-2396,共12页
The area navigation system,discussed in this paper,is composed of ground responders and a navigation terminal and can position a high-velocity aircraft and measure its velocity.This navigation system is silent at ordi... The area navigation system,discussed in this paper,is composed of ground responders and a navigation terminal and can position a high-velocity aircraft and measure its velocity.This navigation system is silent at ordinary times.It sends out a request signal when positioning is required for an aircraft,and then the ground responders send a signal for resolving the aircraft.Combining the direct sequence spread spectrum and frequency hopping,the concealed communication mode is used in the whole communication process,with short communication pulses as much as possible,so the system has strong concealment and anti-interference characteristics.As the transmission delay is apparent in the response communication mode,there is a big error where the common navigation algorithm is used for the positioning and velocity measurement of a high-velocity aircraft.In this paper,a new algorithm is proposed,which can eliminate the influence of response communication delay on the positioning of a high-velocity moving target to realize the precise positioning and velocity measurement of a high-velocity aircraft. 展开更多
关键词 NAVIGATION pseudo-noise code ranging POSITIONING velocity measurement edge computing
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Development of Cu foam-based Ni catalyst for solar thermal reforming of methane with carbon dioxide 被引量:3
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作者 jianzhong qi Yanping Sun +3 位作者 Zongli Xie Mike Collins Hao Du Tianying Xiong 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2015年第6期786-793,共8页
Using solar energy to produce syngas via the endothermic reforming of methane has been extensively inves- tigated at the laboratory- and pilot plant-scales as a promising method of storing solar energy. One of the cha... Using solar energy to produce syngas via the endothermic reforming of methane has been extensively inves- tigated at the laboratory- and pilot plant-scales as a promising method of storing solar energy. One of the challenges to scaling up this process in a tubular reformer is to improve the reactor's performance, which is limited by mass and heat transfer issues. High thermal conductivity Cu foam was therefore used as a sub-strate to improve the catalyst's thermal conductivity during solar reforming. We also developed a method to coat the foam with the catalytically active component NiMg3AlOx. The Cu foam-based NiMg3AlOx performs better than catalysts supported on SiSiC foam, which is currently used as a substrate for solar-reforming cat- alysts, at high gas hourly space velocity (≥400,000 mL/(g.h)) or at low reaction temperatures (≤ 720 ℃). The presence of a γ-Al2O3 intermediate layer improves the adhesion between the catalyst and substrate as well as the catalytic activity. 展开更多
关键词 Cu foam-based Ni catalyst Monolithic catalyst Solar thermal reforming of methane
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Research on Survivability of Mobile Ad-hoc Network
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作者 Yuan Zhou Chunhe Xia +1 位作者 Haiquan Wang jianzhong qi 《Journal of Software Engineering and Applications》 2009年第1期50-54,共5页
In this paper, we analyze the survivability of Mobile Ad Hoc Network systemically and give a detailed description of the survivability issues related to the MANET. We begin our work with analyzing the requirements of ... In this paper, we analyze the survivability of Mobile Ad Hoc Network systemically and give a detailed description of the survivability issues related to the MANET. We begin our work with analyzing the requirements of survivability of ad hoc network, and then we classify the impacts that affect survivability into three categories: dynamic topology, faults and attacks. The impacts of these factors are analyzed individually. A simulation environment for the MANET towards survivability is designed and implemented as well. Experiments that under the requirements and the impacts we de-clared are done based on this environment. 展开更多
关键词 AD HOC SURVIVABILITY GTNETS SIMULATION
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Heat Dissipation Performance of Porous Copper with Elongated Cylindrical Pores 被引量:3
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作者 Hao Du Dongzhu Lu +5 位作者 jianzhong qi Yanfang Shen Lisong Yin Yuan Wang Zhongguang Zheng Tianying Xiong 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2014年第9期934-938,共5页
The purpose of this paper is to investigate heat dissipation performance of porous copper with long cylindrical pores fabricated by a unidirectional solidification method. Three samples with porosity of 29.87%, 34.47%... The purpose of this paper is to investigate heat dissipation performance of porous copper with long cylindrical pores fabricated by a unidirectional solidification method. Three samples with porosity of 29.87%, 34.47% and 50.98% were chosen and cut into size of 60 mm (length) × 26 mm (width) × 2 mm (thickness) along the vertical direction of pore axis. Their heat dissipation performance was evaluated by a nonsteady method in air and compared to those of not only bulk copper but also bored coppers with porosity of 30.61% and 32.20%. It is found that the porous copper dissipated heat faster by a forced air convection than that by natural convection from 80 ℃ to room temperature and both porosity and pore size play an important role in the performance for the porous copper. Furthermore, the heat dissipation rate is higher when the forced air was circulated along the specimens than that perpendicular to the specimens for the porous copper. It is revealed that porous copper with bigger porosity and a proper pore size possesses a higher heat dissipation rate. It is concluded that the porous copper with elongated cylindrical pores has larger heat dissipation performance than both the bulk copper and the bored copper, which is attributed to its higher specific surface area. Application of the porous copper for heat dissipation is promising. 展开更多
关键词 Porous copper Heat dissipation POROSITY Pore size
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