Effective multicasting algorithm for dynamic membership with delay constraint

INTRODUCTION Some new emerging applications involve in- formation transmission in a network. Different from traditional single-cast applications, these new arising applications are called multicast as they contain a single sender and multiple receivers. In general, it is needed to construct a multicast routing tree to deliver information along the tree branches. Because links in the tree are shared by paths to different receivers, just one information copy is needed in the middle node. Th…     

On service differentiation in mobile Ad Hoc networks

A network model is proposed to support service differentiation for mobile Ad Hoc networks by combining a fully distributed admission control approach and the DIFS based differentiation mechanism of IEEE802.11. It can provide different kinds of QoS (Quality of Service) for various applications. Admission controllers determine a committed bandwidth based on the reserved bandwidth of flows and the source utilization of networks. Packets are marked when entering into networks by markers according to the committed rate. By the mark in the packet header, intermediate nodes handle the received packets in different manners to provide applications with the QoS corresponding to the pre-negotiated profile. Extensive simulation experiments showed that the proposed mechanism can provide QoS guarantee to assured service traffic and increase the channel utilization of networks.     

On service differentiation in mobile Ad Hoc networks

A network model is proposed to support service differentiation for mobile Ad Hoc networks by combining a fully distributed admission control approach and the DIFS based differentiation mechanism of IEEE802.11. It can provide different kinds of QoS (Quality of Service) for various applications. Admission controllers determine a committed bandwidth based on the reserved bandwidth of flows and the source utilization of networks. Packets are marked when entering into networks by markers according to the committed rate. By the mark in the packet header, intermediate nodes handle the Received packets in different manners to provide applications with the QoS corresponding to the pre-negotiated profile.Extensive simulation experiments showed that the proposed mechanism can provide QoS guarantee to assured service traffic and increase the channel utilization of networks.     

导游提高游客满意度的策略

满足游客的需要是提高游客满意度的前提。提供高质量的导游服务是游客满意的根本。印象管理和游客认知偏差的利用,则是导游积极为游客满意创造的条件。     

关于建立我国体育服务业质量管理体系若干问题的探讨

通过对体育服务产品、体育服务业等一系列与质量体系管理相关的概念的研究和对体育服务产品质量构成要素等问题的初步探讨,以促进我国体育服务组织建立起质量管理体系,提高其管理水平,持续改进服务,以达到提高组织整体体业绩的目标.     

Time allocation scheme in IEEE 802.15.3 TDMA mechanism

In network with a shared channel in TDMA mechanism, it is a core issue to effectively allocate channel time to provide service guarantees for flows with QoS requirements. This paper proposes a simple and efficient time allocation scheme called MES-ESRPT (MCTA at the End of Superframe-Enhanced Shortest Remaining Processing Time) for delay-sensitive VBR traffic in accordance with IEEE 802.15.3 standard. In this algorithm, PNC (piconet coordinator) allocates one MCTA (Management Channel Time Allocation) for each stream which is the process of communication at the end of superframe. During the MCTA period, each transmitter should report current fragments number of the first MSDU (MAC Service Data Unit) and the fragments number of the remainder MSDUs to PNC. In the next superframe, PNC firstly allocates part CTAs (Channel Time Allocation) for each stream based on the remainder fragments number of the first MSDU by SRPT rule, then allocates remainder CTAs for each stream based on all fragments number of remainder MSDUs by the same SRPT rule. Simulation results showed that our proposed MES-ESRPT method achieves significantly better performance in QoS for multimedia streams compared to the existing schemes.     

基于服务质量的Web服务可用性评价方法

为提高Web服务的可用性,设计一种基于可用度的Web服务可用性测试模型,提出了一种Web服务可用性的评价方法,对服务质量指标进行量化评估,为服务请求者选择最优服务提供参考依据。实验表明,该方法具有很好的灵活性和实用性。     

远程学习支持服务学生感知服务质量评价个案研究——基于“内容-品质”二维框架和SERVPERF方法

以服务内容和服务品质两维框架为基础构建评价指标,采用SERVPERF方法对某网络教育学院的远程学习支持服务学生感知服务质量评价进行个案研究。研究认为,相比单从服务内容维度或服务品质维度进行评价,基于服务内容和服务品质两个维度更能全面、完整地评价学习支持服务质量。     

Two-stage evolutionary algorithm for dynamic multicast routing in mesh network

In order to share multimedia transmissions in mesh networks and optimize the utilization of network resources, this paper presents a Two-stage Evolutionary Algorithm （TEA）, i.e., unicast routing evolution and multicast path composition, for dynamic multicast routing. The TEA uses a novel link-duplicate-degree encoding, which can encode a multicast path in the link-duplicate-degree and decode the path as a link vector easily. A dynamic algorithm for adding nodes to or removing nodes from a multicast group and a repairing algorithm are also covered in this paper. As the TEA is based on global evaluation, the quality of the multicast path remains stabilized without degradation when multicast members change over time. Therefore, it is not necessary to rearrange the multicast path during the life cycle of the multicast sessions. Simulation results show that the TEA is efficient and convergent.     

基于MPLS支持层次化移动IP网络的 QoS体系结构及其仿真验证

本文分析了移动IP与MPLS结合并支持IP DiffServ模型以解决移动IP网络的QoS问题的体系结构,讨论了这种体系中的节点功能模型和处理流程,通过网络仿真验证了这种体系结构的有效性。     

信息时代的个人知识管理探微

在技术进步日新月异的信息时代,个人知识的系统高效管理已经成为知识经济发展的必需。本文探讨了个人知识管理的基本概念和主要内容,着重介绍如何利用先进的信息技术工具辅助个人知识管理,最终实现个人知识管理系统的构架。     

QFD理论在高校创新创业教育课程设计中的应用研究

我国当前高校创新创业教育课程存在一定的不足,尽管有研究提出了改进对策或建议,但其提出过程缺少科学系统的分析工具,且所提出的对策措施千校一面,缺乏针对性。造成这种状况的本质原因在于未对课程对象(顾客)需求期望进行清晰准确的识别。质量功能展开(QFD)立足于顾客,能有效将顾客需求转化为产品/服务设计要求。因此,将QFD与高校双创课程设计相结合,提出创新创业课程质量功能展开模型(ICQFDM),通过"顾客需求—教学规划"与"教学规划—教学管理"两级质量屋,将顾客对于双创课程的要求转化到课程设计要求中。以南京已开展创新创业课程且互为竞争对手的2所财经类院校为例,演示模型的具体运用过程。结果显示:2所高校创新创业课程设计路径存在较大差异。ICQFDM的提出为高校建设创新创业课程提供了可操作的分析框架,各高校可结合不同实际情况,制定适用于自身的课程建设措施。     

对图书馆全方位开放式服务的思考

全方位开放式服务是高校图书馆现代化的标志和发展趋势。图书馆必须适应时代变迁,根据读者信息需求的变化保障全方位开放式服务的实施。文章分析了现阶段高校图书馆实施这种服务方式存在的问题及相应的对策。     

论改革背景下的公共服务市场化趋势

改革开放推行30余年问,市场化的浪潮已经席卷中国各个领域,公共管理也受到了巨大的冲击。这种冲击并非中国所独有,早在上个世纪下半叶,西方各发达国家均相继兴起新公共管理运动等改革。在内外环境的影响下,公共服务作为中国公共管理的核心内容,率先转向市场化。但是,由于中国社会、制度环境还不够成熟,中国整体的市场化转型并未完全实现,公共服务市场化的过程中仍不免出现种种f．q题。针对我国公共服务市场化的现状、存在问题进行深入分析．并结合我国实际情况提出相应的解决对筻。     

专业技术人员继续教育与SNS的结合发展

SNS与专业技术人员继续教育结合发展优势明显,值得推广和深入研究。尽管这种新型专业技术人员继续教育发展模式具有多样性,但初期发展模式可概括为政府或教育管理部门主导型、行业协会或教育机构主导型和企事业或个体主导型发展模式;从宏观层面看,其未来发展重点在于法律法规、监督管理、继续教育内容微小化的研究与实施。     

Interactive Web service choice-making based on extended QoS model

INTRODUCTION Web service technologies are immerging as a powerful vehicle for organizations that participate in Web based dynamic collaborations. An organization can publish its business processes as Web services to the Internet for potential customers to discover and use them. Compared with traditional fixed inter-orga- nization collaboration relationship, the Web-based dynamic collaboration brings service providers more customers and more profits, and enables consumers to search in a w…     

面向CRM的动态质量体系管理模型及系统

分析了企业现有ISO9000质量体系管理系统的局限性及其管理中存在的关键问题,建立了动态质量体系管理数据模型(DQSMDM),并给出了某大型工程机械制造企业实施基于此模型的质量体系管理系统的成功应用.     

A customised Total Quality Management Framework for schools

Abstract

Research has revealed that many of the historically disadvantaged schools in South Africa experience difficulty in implementing policies aimed at restoring the quality of teaching and learning. The difficulty has been attributed to several factors such as poor conceptualisation and implementation of quality management systems at school level. This article reports on empirical research that investigated the possibility of applying Total Quality Management principles in schools for the purpose of restoring the culture of learning and teaching. Data was collected through qualitative and quantitative methods in selected schools situated in the Tshwane North District. The findings revealed that there is a gap between what is provided in the policy framework on the management of quality teaching and learning. It is recommended that in order to fill the gap, schools need to apply customised principles of Total Quality Management. The primary aim of this research was to develop such an integrated framework that is not only theoretically sound but that has been customised for schools’ contexts and conditions.     

《前厅与客房服务管理》课程教学方法的探讨与应用

随着现代社会经济的发展,中国的酒店业蓬勃发展,而且是越来越豪华、越来越现代化。本文以《前厅与客房服务管理》课程为例,探讨其课程教学方法的改革与实践,希望通过这种尝试,培养出更多符合酒店实际需要的专业技能性人才。     

Adaptive service configuration approach for quality of service management in ubiquitous computing environments

Mobility and resource-limitedness pose challenging issues to service configuration for quality of service （QoS） management in ubiquitous computing environments. Previous configuration approaches, such as static resource reservation, dynamic resource allocation and single service composition are not valid in the environments. In this study, we present an adaptive service configuration approach. Firstly, we reduce the dynamic configuration process to a control model which aims to achieve the variation of critical QoS on minimal level with less resource cost. Secondly, to deal with different QoS variations, we design two configuration strategies--service chain reconfiguration and QoS parameter adjustment--and implement them based on fuzzy logic control theory. Finally, a configuration algorithm is developed to flexibly employ the two configuration strategies in tune with the error of critical QoS in configuration process. The results of simulation experiments suggest that our approach outperforms existing configuration approaches in both QoS improvement and resource utilization.