摘要

Great advances in cloud computing have drawn the interest of industry. Cloud infrastructures are used, mainly, for monitoring the shop oor. In recent years cloud technologies combined with IoT technologies have initiated the e ort to close loops between industrial applications and cloud infras- tructures. This thesis examines the e ect of including remote servers, both local and centralized, in the closed control loop. Speci cally, we investigate how delays and jitter a ect the closed control loop. A prototype is developed to include servers on a control loop and inject delays and jitter in the network. Furthermore, delay mitigation mechanisms are proposed and, using the prototype, a number of experiments are performed to evaluate them. The mitigation mechanisms focus mainly on delays and jitter that are larger than the period of closed control loop. The proposed mechanisms improve the closed control loop response but still fall short compared to the performance of the close control loop when it executes locally, without any servers included. We also, show that local servers can be included in the closed control loop without signi cant degradation in the performance of the system.

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連結網址

http://mdh.diva-portal.org/smash/get/diva2:821335/FULLTEXT01.pdf

作者

Alma Didic Pavlos Nikolaidis

國家 Sweden
發佈日期 2015
出處 Thesis for the Degree of Master of Science in Intelligent Embedded
單位 Malardalen University
關鍵字 Real-time, 即時, IoT, 物聯網, Network, 網路
等級 中階
LC&VS Type:maintenance/usage
Vertical Layers Information
Horizontal Layers Field Device
瀏覽次數 290