Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2018-05-20 Cooperative journals: 《计算机应用研究》
Abstract: In the 5G mobile communication network virtualization scenario, how to deploy network slices safely is a prerequisite for future large-scale commercial use. Aiming at the security of 5G network slice deployment, this paper proposed a strategy for network slicing deployment based on security trust. The deployment strategy could effectively quantify and analyzed the security of VNF and network resources by proposing the concept of security trust value, and on this basis, constructed the mathematical model of network slice deployment using 0-1 integer linear programming method. The strategy used heuristic algorithm to find the minimum cost of network slice deployment. Simulation results show that the deployment strategy reduces the deployment cost and achieves better security revenue and deployment rate of return under the premise of ensuring the deployment security.
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2018-10-11 Cooperative journals: 《计算机应用研究》
Abstract: In the 5G mobile communication network virtualization scenario, a redundant backup method is usually adopted in order to ensure the reliability of network services. To reduce the cost of backup resources, first, by ordering the Backup-Cost Importance of the virtual network functions, this paper makes a joint backup of virtual network function with the largest and second largest Backup-Cost Importance in each iteration, and obtain the optimal backup strategy through the corresponding selection and update model. Finally, the method is compared with other three methods, the proposed method has better performance in the backup cost, the amount of used physical node, the number of accepted service requests and backup resource utilization.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract: The Effect of NO2- on the early stages of pitting corrosion of Q235 carbon steel in a simulated concrete pore solution (pH=11) was studied by means of polarization curves, Mott-Schottky curves and XPS methods. It was found that, NO2- inhibits both the stable pitting corrosion and the metastable pitting corrosion. The metastable pitting corrosion potential and the stable pitting corrosion potential increase with the increase of NO2- concentration and follow the similar trend. The nucleation process of pits can apparently be inhibited by a low content of NO2-, however this effect increases only slightly as the NO2- content higher than a critical value about 0.03 mol/L. With the increase of NO2- concentration, more Fe2 + in the passive film can be oxidized into Fe3 + and thereby, the defect density related with oxygen vacancies decreases, so the nucleation process of pits may be inhibited.