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
基于BIM技术的绿色设计,即建筑设计工作基于建筑信息模型(Building Information Modeling,BIM),结合当地气候条件,强调从设计初始阶段便依靠设计、评估的决策循环迭代流程,进行建筑效能分析(Building Performance Analysis,BPA),来产生...基于BIM技术的绿色设计,即建筑设计工作基于建筑信息模型(Building Information Modeling,BIM),结合当地气候条件,强调从设计初始阶段便依靠设计、评估的决策循环迭代流程,进行建筑效能分析(Building Performance Analysis,BPA),来产生符合环境效益的最佳设计方案,最终达到追求环境可持续发展的目的。本文试从以下三个方面探讨BIM技术在绿色设计过程中的重要作用:基于BIM技术的绿色设计内容、基于BIM技术的绿色设计实施体系、基于BIM技术的绿色设计评估体系,以期通过BIM技术在绿色设计实施层面的技术实践总结,为日后的绿色设计工作提供方法参考。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.
文摘基于BIM技术的绿色设计,即建筑设计工作基于建筑信息模型(Building Information Modeling,BIM),结合当地气候条件,强调从设计初始阶段便依靠设计、评估的决策循环迭代流程,进行建筑效能分析(Building Performance Analysis,BPA),来产生符合环境效益的最佳设计方案,最终达到追求环境可持续发展的目的。本文试从以下三个方面探讨BIM技术在绿色设计过程中的重要作用:基于BIM技术的绿色设计内容、基于BIM技术的绿色设计实施体系、基于BIM技术的绿色设计评估体系,以期通过BIM技术在绿色设计实施层面的技术实践总结,为日后的绿色设计工作提供方法参考。
