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On Cost Aware Cloudlet Placement for Mobile Edge Computing

IEEE/CAA Journal of Automatica Sinica 2019年第4期6卷 926-937页

作者： Qiang Fan nirwan ansari IEEE Advanced Networking Lab Department of Electrical and Computer EngineeringNew Jersey Institute of TechnologyNewarkUSA

As accessing computing resources from the remote cloud inherently incurs high end-to-end(E2E)delay for mobile users,cloudlets,which are deployed at the edge of a network,can potentially mitigate this problem.Although some research works focus on allocating workloads among cloudlets,the cloudlet placement aiming to minimize the deployment cost(i.e.,consisting of both the cloudlet cost and average E2E delay cost)has not been addressed effectively so far.The locations and number of cloudlets have a crucial impact on both the cloudlet cost in the network and average E2E delay of users.Therefore,in this paper,we propose the Cost Aware cloudlet PlAcement in moBiLe Edge computing(CAPABLE)strategy,where both the cloudlet cost and average E2E delay are considered in the cloudlet placement.To solve this problem,a Lagrangian heuristic algorithm is developed to achieve the suboptimal solution.After cloudlets are placed in the network,we also design a workload allocation scheme to minimize the E2E delay between users and their cloudlets by considering the user mobility.The performance of CAPABLE has been validated by extensive simulations.

关键词： Cloudlet placement mobile cloud computing mobile edge computing

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Fractional Factorial Analysis of Gelam Wood Pyrolysis

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材料科学与工程（中英文A版） 2012年第7期2卷 530-536页

作者： nirwan Syarif Ivandini Tribidasari P Widayanti Wibowo Department of Chemistry Faculty of Mathematics and Natural Sciences University of Indonesia Indonesia 16424 Department of Chemistry Faculty of Mathematics and Natural Sciences Sriwij'aya University Indonesia 30662

Conductive activated carbons were prepared by pyrolysis process at temperatures below 800 °C with the precursor form Gelam wood (Melaluca cajuputi Powell). The pyrolyses were conducted starting from 230 °C to 260 °C as the preheating step, followed by the pyrolysis at 700 °C. Cooling process was applied between the carbonization and the activation processes. Fractional factorial design was performed to analyze the influence of the preheating temperature, volume loading, cooling step treatment and the heating period at the carbonization-activation temperature based on the electrical resistivity of the carbon product. The results showed that the electrical resistivity of carbons reduced in the order of 1,000 ? to 10 ?. The lowest resistivity obtained with this method is equal to 5 ?·cm.

关键词：热解过程因子分析分数预热温度冷却过程活化过程因子设计活化温度

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