دانلود رایگان مقاله انگلیسی زمان بندی خدمات چندرسانه ای در محیط محاسبات ابری - تیلور و فرانسیس 2017

ABSTRACT

Currently, security is a critical factor for multimedia services running in the cloud computing environment. As an effective mechanism, trust can improve security level and mitigate attacks within cloud computing environments. Unfortunately, existing scheduling strategy for multimedia service in the cloud computing environment do not integrate trust mechanism when making scheduling decisions. In this paper, we propose a scheduling scheme for multimedia services in multi clouds. At first, a novel scheduling architecture is presented. Then, We build a trust model including both subjective trust and objective trust to evaluate the trust degree of multimedia service providers. By employing Bayesian theory, the subjective trust degree between multimedia service providers and users is obtained. According to the attributes of QoS, the objective trust degree of multimedia service providers is calculated. Finally, a scheduling algorithm integrating trust of entities is proposed by considering the deadline, cost and trust requirements of multimedia services. The scheduling algorithm heuristically hunts for reasonable resource allocations and satisfies the requirement of trust and meets deadlines for the multimedia services. Detailed simulated experiments demonstrate the effectiveness and feasibility of the proposed trust scheduling scheme.

7. Conclusion and future work

In this paper, we develop and evaluate a novel scheduling and provision scheme for multimedia services in cloud computing environment. Trust mechanism can dynamically assess the trust degree of multimedia service provider by Bayesian method and integrated the trust metric into scheduling, which ensures the execution success rate of security-critical multimedia tasks. The proposed trustful scheduling scheme can heuristically seek approximate optimal resource allocations and meet the requirement of trust and deadline for multimedia services. The performance of TMSS algorithm is compared with three well-known scheduling algorithms for multimedia service: MCT, TWFS and Greedy algorithms. Detailed experiment results demonstrate the feasibility and efficiency of the proposed scheme.

As part of our future work, we plan to extend the TMSS algorithm for dependent multimedia services in cloud computing environments.