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Towards Enabling Unmanned Aerial Vehicles as a Service for Heterogeneous Applications
Farid Nait-Abdesselam,Ahmad Alsharoa,Mohamed Y. Selim,Daji Qiao,Ahmed E. Kamal 한국통신학회 2021 Journal of communications and networks Vol.23 No.3
The increasing use of unmanned aerial vehicles (UAVs) invarious commercial applications, such as precision agriculture andaerial remote sensing, is fast contributing to a significant growthin the UAV market. Also, it is crucial to provide continuous cov erage after failures of wireless network components or additionalbandwidth in high traffic situations. By introducing the concept ofUAVs as a service (UaaS), we propose a novel framework, dubbed 3S, consisting of four phases: Demand, decision, deployment,and service. The main objective of this framework is to provide arealistic and streamlined approach to support the implementationof the UaaS paradigm. The technical problems involved include de termining the type and number of UAVs to be deployed and theirfinal locations (e.g., hovering or on-ground). They also include thetrajectory planning, possibly several times, between charging sta tions and deployment locations. We present the application of the 3S framework to two case studies with the goal of providing wire less connectivity services to (i) static users after failures of wirelessnetwork components, including long-term and short-term failures,and (ii) dynamic users in wireless relaying systems.
Life Span Extension of Caenorhabditis elegans by Novel Pyridoperimidine Derivative
Ahmed A. R. Sayed,Kamal M. El-Shaieb,Aboul-Fetouh E. Mourad 대한약학회 2012 Archives of Pharmacal Research Vol.35 No.1
Zwitterions formed from the addition of triphenylphosphine to dialky acetylene-dicarboxylates attack the nucleus of both 1H-perimidine (1) and 1H-benzo[d]imidazole (9) to form novel pyrido[1,2,3-cd]perimidine and imidazo[4,5,1-ij]quinoline derivatives in moderate yields (64-72%). The biological activity of the products has been studied. Compound 3a was found to extend life span of wild type Caenorhabditis elegans under standard laboratory conditions. Both heat stress and induced chemical stress resistance of wild type C. elegans were improved in a reverse dose-dependent manner due to 3a treatment. In addition, treatment of worms with compound 3a significantly attenuated the formation of advanced glycation end products in a reverse dose-dependent manner.