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RISS 인기검색어
- 검색키워드
- 저자 : Saqib Mehmood (검색결과 2 건)
- 무료
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Distributed SDN Based Network State Aware Architecture for Flying Ad-hoc Network
Muhammad Saqib,Asif Mehmood,Adeel Rafiq,Afaq Muhammad,Wang-Cheol SONG 한국통신학회 2020 한국통신학회 APNOMS Vol.2020 No.09
Flying networks are resource constraints while the nature of nodes’ mobility is very dynamic and unpredicted. Therefore, these networks are very prone to link failure and performance degradation. By considering the existing limitations, this work proposes a new approach consists of proactive and reactive network failure mitigation techniques that have been named as a hybrid approach. In the proposed architecture, the SDN controllers are distributed where each one controls its local domain nodes. The controller node continuously monitors the network state information and proactively adjusts the near-future changes to the topology. Each local domain also contains a sink node that directly connects to the controller. The sink node is used to forward the network state information to the controller and keep the controller defined flow rules for local domain nodes. The sink node can also request a new path in case of any link failure or any topology updates cause by nodes’ movement. Besides, a distributed routing protocol also runs on domain nodes to establish connectivity toward the sink node.
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Investigation of different aspects of laminar horseshoe vortex system using PIV
Muhammad Yamin Younis,Hua Zhang,Bo Hu,Zaka Muhammad,Saqib Mehmood 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.2
Juncture flow is a classical fluid mechanics problem having wide applications in both aero and hydro dynamics. The flow separatesupstream of the obstacle due to the adverse pressure gradient generated by it, with the formation of the vortical structure called “horseshoevortex.” The current study is carried out for an elliptical leading edge obstacle placed on a flat plate to investigate the horseshoevortex for a range of Reynolds number (ReW) based on maximum width (W) for which the incoming boundary layer is laminar. Fourdifferent types of horseshoe vortex systems were found: the steady, amalgamation, transition and breakaway. The transition vortex systemis one after which the vortex system changes from amalgamation to breakaway. In this phase the vortex system alternatively undergoesboth amalgamation and breakaway vortex cycles. The effect of variation in the chord wise shape of the obstacle is investigated. Thequantitative measurements of PIV show that the vortex system does not undergo any significant change for different chord lengths of themodel with the fixed aspect ratio and maximum width. The most upstream saddle point is also studied for steady horseshoe vortex regionand found that it is the “saddle of attachment” where flow attaches to the plate surface instead of separating from it.
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