以三階段排程機制提昇雲端運算之服務品質

由於現今電腦網路頻寬及硬體設備相關技術的持續發展演進，使得雲端運算(Cloud Computing)之概念應運而生。由於雲端運算主要是透過分散的服務節點協力合作完成一個大型的工作，因此如何將工作有效的切割並分配到每一個服務節點上，才不會造成某些服務節點負擔過重，而某些服務節點卻是閒置的情況，是一個值得探討的議題。為增加雲端運算系統的可靠性、穩定性以及資源有效且公平被使用，本研究以階層式雲端網路拓樸為基礎，提出三階段排程演算法，使得每個需要執行的工作都能被分配到適當的資源並有效的改善每個服務節點的負載與降低資源的浪費，以提高雲端運算之服務品質。

Network bandwidth and hardware technology are developing rapidly, resulting in the vigorous development of the Internet. A new concept, cloud computing, uses low-power hosts to achieve high usability. The cloud computing refers to a class of systems and applications that employ distributed resources to perform a function in a decentralized manner. Cloud computing can utilize the computing resources on the network to facilitate the execution of complicated tasks that require large-scale computation. Thus, the selecting nodes for executing a task in the cloud computing must be considered. However, in this study, a three-phases scheduling in a hierarchical cloud computing network is advanced. The proposed scheduling can utilize better executing efficiency and maintain the quality of service.