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2.
In this work, we study dynamic provisioning of multicast sessions in a wavelength-routed sparse splitting capable WDM network
with an arbitrary mesh topology where the network consists of nodes with full, partial, or no wavelength conversion capabilities
and a node can be a tap-and-continue (TaC) node or a splitting and delivery (SaD) node. The objectives are to minimize the
network resources in terms of wavelength-links used by each session and to reduce the multicast session blocking probability.
The problem is to route the multicast session from each source to the members of every multicast session, and to assign an
appropriate wavelength to each link used by the session. We propose an efficient online algorithm for dynamic multicast session
provisioning. To evaluate the proposed algorithm, we apply the integer linear programming (ILP) optimization tool on a per
multicast session basis to solve off-line the optimal routing and wavelength assignment given a multicast session and the
current network topology as well as its residual network resource information. We formulate the per session multicast routing
and wavelength assignment problem as an ILP. With this ILP formulation, the multicast session blocking probability or success
probability can then be estimated based on solving a series of ILPs off-line. We have evaluated the effectiveness of the proposed
online algorithm via simulation in terms of session blocking probability and network resources used by a session. Simulation
results indicate that our proposed computationally efficient online algorithm performs well even when a fraction of the nodes
are SaD nodes. 相似文献
3.
应用型机械本科专业教学体系改革研究与实践 总被引:4,自引:0,他引:4
根据当前高等教育改革与发展的指导思想,紧紧围绕国家实施制造业信息化建设工程为背景,积极配合打造浙江先进制造业基地建设,结合现代机械专业结构调整,本着交叉、复合、应用型人才的培养目标,塑造具有宽口径、厚基础和强创新意识的人才培养理念,以数字化设计制造为核心,以机械技术、电子技术、信息技术和管理学科结合为主线,突出知识综合与创新能力,强调专业实践与专业知识的有效结合,有的放矢实施机械专业教学改革与实践。 相似文献
4.
K. T. Yu S. H. Sheu K. S. Chen 《The International Journal of Advanced Manufacturing Technology》2007,34(5-6):421-429
Recently, studies associated with testing the quality and performance of each process for a product with multi-characteristics
are proposed more often. However, most studies are limited to discussing one single type of quality characteristic. Practically,
a multi-characteristic product is potentially composed of three types: smaller-the-better, larger-the-better, and nominal-the-best.
In this paper, we propose an integrated product capability index which considers these three different types of quality characteristics.
According to the theory of testing hypothesis, we develop a testing procedure for the product capability index to judge whether
the process capabilities of total quality characteristics meet the customers’ demands. In addition, the relationship between
the product capability index and the yield of the entire product will be introduced. Finally, an example is provided as a
practical application. 相似文献
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W. L. Pearn M. H. Shu B. M. Hsu 《The International Journal of Advanced Manufacturing Technology》2004,24(1-2):140-147
The multiprocess performance analysis chart (MPPAC) based on the process capability index
Cpm, called Cpm MPPAC, is developed for analysing the manufacturing quality of a group of processes in a multiple process environment. The Cpm MPPAC conveys critical information of multiple processes regarding the departure of the process and process variability from one single chart. Existing research works on MPPAC are restricted to obtaining quality information from one single sample of each process ignoring sampling errors. The information provided from existing MPPAC charts, therefore, is unreliable and misleading and results in incorrect decisions. In this paper, we consider the natural estimator of Cpm based on multiple samples. Based on the natural estimator of Cpm, we consider the sampling errors by providing an explicit formula with the Matlab program to obtain the estimation accuracy of the Cpm. We tabulate the sampling accuracy of Cpm for sample size determination so that the engineers/practitioners can use it for their in-plant applications. An example of multiple precision voltage reference (PVR) processes is presented to illustrate the applicability of
Cpm MPPAC for manufacturing quality control. 相似文献
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9.
创建学习型组织促进企业持续发展 总被引:1,自引:0,他引:1
指出21世纪是一个新知识经济的时代,企业在市场中的竞争力,是企业政治力、经济力、文化力3个力的综合反映.其中,文化力是核心竞争力,而其关键要素已不是单纯的成本与效率,而是指创新能力.企业的创新,是一个整体性的活动,这就提出了要创建一个学习型的组织,来达到创新的目的.本文概述了创建学习型组织的重要意义,探讨了学习型企业的创建途径,旨在起到抛砖引玉的作用. 相似文献
10.
工艺参数对送粉式激光熔覆组织及性能的影响 总被引:3,自引:0,他引:3
通过对不同规范参数情况下激光熔覆过程的研究分析,讨论了在熔覆过程中不同激光粉匹配条件对熔覆层尺寸、熔覆层组织及性能的影响,从而确定其影响规律。 相似文献