حرکت گروهی سیستمهای چند عاملی با داده های نمونه شده تحت حملات سایبری
محورهای موضوعی : پردازش چند رسانه ای، سیستمهای ارتباطی، سیستمهای هوشمند
سحر یزدانی
1
(1. استادیار، گروه برق و مهندسی پزشکی، واحد زنجان، دانشگاه آزاد اسلامی، زنجان، ایران)
کلید واژه: حرکت گروهی, اطلاعات نمونه برداری شده , حمله سایبری, سیستم های چند عامله,
چکیده مقاله :
این مقاله، به ارائه الگوریتمی برای حرکت گروهی سیستم های چندعاملی در حضور حمله می‌‌پردازد. ابتدا یک الگوریتم جدید برای حرکت گروهی سیستم های چندعاملی با وجود رهبر مجازی با داده‌های نمونه شده ارائه می‌شود به طوری که همه اهداف حرکت گروهی یعنی لینک های اولیه بین عوامل حفظ و از برخورد بین عوامل جلوگیری شود و همچنین همگرایی سرعتی عوامل به سرعت رهبر مجازی تضمین شود. ازآنجا که حمله‌های سایبری می‌تواند باعث ازبین رفتن به هم پیوستگی شبکه عامل ها و یا برخورد آن ها به هم و در نهایت عدم همگرایی عامل ها به رهبر مجازی شود، ازین رو در اینجا به بررسی مسأله تحت حمله‌های موفق ولی جبران پذیر پرداخته می‌شود. در این گونه حمله‌ها، حمله می‌تواتد به هم پیوستگی شبکه ارتباطی را ازبین ببرد ولی بعد از مدتی امکان بازیابی شبکه وجوددارد. در ادامه الگوریتم ارائه شده برای حرکت گروهی با داده‌های نمونه شده برای استفاده در شرایط حملات سایبری اصلاح می‌شود و نشان داده می‌شود که در حضور حمله باز هم گروه قادر است به حرکت هماهنگی که همه اهداف حرکت گروهی را برآورده می‌کند، دست یابد.
Introduction: Flocking is a type of collective behavior which is observed in the nature. In the design of a flocking algorithm, it should be ensured connectivity of agents’ network and the collision avoidance, and velocities convergence of agents to that of virtual leader. In practice due to the limitations in the measurement and control units, it is often impossible to ensure the continuity of information. Thus, the study of the flocking problem under the sampled data frameworks is indispensable. However, to the best of the authors’ knowledge, there are very few works on the sampled-data flocking. On the other hand, in many practical applications, the multi-agent systems are controlled through some communication networks. The transmitted data among agents could be easily exploited by adversaries due to the open network links among sensors, controllers and actuators. Since in practice often the attacks are capable to destroy a number of edges within the network or cause to collide among agents, the study of networked system under the cyber-attacks is very important. In the cyber-attacks, successful but recoverable attacks have attracted more attention. Successful attacks refer to a class of attacks by which the network is broken dow n into a group of isolated clusters. Recoverable attacks refer to a class of attacks that the network can recover from after a period of time. In this paper, we study the sampled-data flocking of multi-agent systems under the successful but recoverable network attacks.
Method: Here, defining a new discrete-time energy function we prove the asymptotic velocity convergence of agents to the velocity of virtual leader. Then, through the upper bound of the energy function, we find an upper bound for the sampling period such that the connectivity of network is preserved and collision is avoided, and also, the velocity convergence is ensured. After that, we modify the algorithm for application in cyber-attacks.
Results: We show that under our proposed sampled-data algorithm, no link is lost from initial network, no collision is occurred among agents, and the velocity convergence of agents to that of virtual leader is ensured. Also, demonstrate the proposed algorithm is applicable for the flocking under the attack problem.
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