Software performance evaluation in multimedia communication systems is typically formulated into a multi-layered client-server queuing network(MLCSQN) problem. However, the existing analytical methods to MLCSQN model ...Software performance evaluation in multimedia communication systems is typically formulated into a multi-layered client-server queuing network(MLCSQN) problem. However, the existing analytical methods to MLCSQN model cannot provide satisfactory solution in terms of accuracy, convergence and consideration of interlocking effects. To this end, this paper proposes a heuristic solving method for MLCSQN model to boost the performance prediction of distributed multimedia software systems. The core concept of this method is referred to as the basic model, which can be further decomposed into two sub-models: client sub-model and server sub-model. The client sub-model calculates think time for server sub-model, and the server sub-model calculates waiting time for client sub-model. Using a breadthfirst traversal from leaf nodes to the root node and vice versa, the basic model is then adapted to MLCSQN, with net sub-models iteratively resolved. Similarly, the interlocking problem is effectively addressed with the help of the basic model. This analytical solver enjoys advantages of fast convergence, independence on specific average value analysis(MVA) methods and eliminating interlocking effects.Numerical experimental results on accuracy and computation efficiency verify its superiority over anchors.展开更多
总装垫墩是浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)上部组块在整个建造过程中的重要支撑构件。基于某大型FPSO上部组块建造项目,采用结构分析计算机系统(Structural Analysis Computer System,SACS)软件...总装垫墩是浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)上部组块在整个建造过程中的重要支撑构件。基于某大型FPSO上部组块建造项目,采用结构分析计算机系统(Structural Analysis Computer System,SACS)软件对上部组块总装垫墩的支反力进行计算,并采用Ansys软件对上部组块总装垫墩进行建模和强度校核。结果表明,两种不同类型的总装垫墩的承载力均可满足该项目的建造需求,且对地压力均在地基承载力的允许范围内。展开更多
基金supported by the Application Research of the Remote Sensing Technology on Global Energy Internet(JYYKJXM(2017)011)the National Natural Science Foundation of China(61671332,41701518,41771452,41771454,U1736206)+4 种基金National key R&D Project(2016YFE0202300)Hubei Province Technological Innovation Major Project(2017AAA123)Applied Basic Research Program of Wuhan City(2016010101010025)Basic Research Program of Shenzhen(JCYJ20170306171431656)the Fundamental Research Funds for the Central Universities(2042016gf0033)
文摘Software performance evaluation in multimedia communication systems is typically formulated into a multi-layered client-server queuing network(MLCSQN) problem. However, the existing analytical methods to MLCSQN model cannot provide satisfactory solution in terms of accuracy, convergence and consideration of interlocking effects. To this end, this paper proposes a heuristic solving method for MLCSQN model to boost the performance prediction of distributed multimedia software systems. The core concept of this method is referred to as the basic model, which can be further decomposed into two sub-models: client sub-model and server sub-model. The client sub-model calculates think time for server sub-model, and the server sub-model calculates waiting time for client sub-model. Using a breadthfirst traversal from leaf nodes to the root node and vice versa, the basic model is then adapted to MLCSQN, with net sub-models iteratively resolved. Similarly, the interlocking problem is effectively addressed with the help of the basic model. This analytical solver enjoys advantages of fast convergence, independence on specific average value analysis(MVA) methods and eliminating interlocking effects.Numerical experimental results on accuracy and computation efficiency verify its superiority over anchors.
文摘总装垫墩是浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)上部组块在整个建造过程中的重要支撑构件。基于某大型FPSO上部组块建造项目,采用结构分析计算机系统(Structural Analysis Computer System,SACS)软件对上部组块总装垫墩的支反力进行计算,并采用Ansys软件对上部组块总装垫墩进行建模和强度校核。结果表明,两种不同类型的总装垫墩的承载力均可满足该项目的建造需求,且对地压力均在地基承载力的允许范围内。
