【摘 要】
:
One benefit of SOA is from service composition which combines existing services to form a new valued-added service in the form of business process. This also cr
论文部分内容阅读
One benefit of SOA is from service composition which combines existing services to form a new valued-added service in the form of business process. This also creates the need to ensure that the performance of those composite services meets the business requirements. This paper proposes a method for evaluating the performance of composite services. We automatically transform a composite service modeled by BPEL,into performance model based on Layered Queuing Networks(LQN) and then leverage existing LQN solvers to predict their performance. The inputs to our transformation algorithm are an XML file which contains eService composition model complying with the BPEL4WS specification,a related performance profile and eService topology. The output of the model is the corresponding LQN model which can be directly analyzed using existing LQN solvers.
其他文献
当今 ,全球数以百万的人们正在不安全和不利于健康的场所中工作。1999年国际劳工组织(IL0)的资料表明 :1990—1995年 ,全球每年职业性病因导致的死亡人数为110万 ,其中癌症占34 % ;损伤占25 % ;慢性呼
人生如歌,岁月如歌,往事亦如歌。这样的歌,有时激越,有时低沉;有时令人振奋,有时令人扼腕:有时让人一次次忆起,有时又让人不忍回想……伟人的经历令人景仰,而平凡人的人生则
Since software has infiltrated in many services,designers need to consider service design and software designs a whole. This paper provides a novel service descr
Software outsourcing has became a common method used in software development. To guide the software outsourcing process pattern decision,this paper puts up a neu
A method for allocating Walsh codes by group in a CDMA(Code Division Multiple Access) cellular system is disclosed. The proposed system provides a method for gro
目前,由于保健药品(饮、食品)的种类越来越多,其组分也较复杂,各种人为加入的元素如铁、锌、钙等含量较高,在样品分析过程中难免要相互干扰。在测定这类样品中铅的浓度时,按
研究在纵向磁场环境下的薄板的非线性振动问题,依据电动力学基本方程和板壳理论,导出了纵向磁场中导电薄板的非线性磁弹性振动方程以及电磁力表达式。针对两长边简支的导电条形
“千里马常有,而伯乐不常有。”我国著名数学家、教育家熊庆来可谓既是千里马又是伯乐。他是我国函数论研究的一位先驱与主要开拓者,也是我国近代数学研究与高等数学教育的一位奠基者。他曾在东南大学和清华大学,参与创建数学系和主持系务及教学工作,培育了一批优秀的学生,成长为杰出的数理专家。 1893年,熊庆来出生于云南省彌勒县。他曾三次赴欧,主要在法国学习和从事研究工作,总计逾17年。他第一次赴欧是1913
本文建立了考虑转子和定子动力学特性的转子/定子碰摩的模型,先采用解析的方法得到了干摩擦反向涡动失稳的存在区域和涡动频率,然后采用数值仿真的方法得到不同质量比,不同碰摩
综述了近年来转子系统裂纹故障诊断研究的主要成果和发展前景。首先,对转子系统裂纹故障的刚度模型、含裂纹的单一和耦合故障转子系统非线性动力学非线性特性和裂纹转子系统的