基于互联网模式的绿色汽车美容服务技术研究

我国的经济在改革开放以来逐渐朝着多元化的方向发展,人民的生活水平也得到了明显的提高,汽车也逐渐成为普遍的代步工具,汽车美容行业也就在这种社会发展状态下应运而生。作为新兴产业,虽然得到了一定程度的发展,但是其发展空间和潜力还是巨大的,计算机技术的不断更新更是为其发展提供了相应助力。线上及线下多元化的服务模式为消费者提供了更加全面的服务保障。文章对此展开了分析。     

A machine service model with a service station consisting of r unreliable units

This paper deals with a machine service model with a service station which consists of r unreliable units. Each machine calls for being served after it continuously working for an exponential interval time. The service station occasionally occurs breakdown which is caused by the failures of units. The service station can serve the machine if and only if none of units fails. The lifetimes of the units have different exponential distributions, while the repair times of the units have different general distributions. The time of serving a machine has a general distribution. Using the supplementary variable method and Takáes' results, we obtain the queueing quantities and reliablity quantities of the model.     

对称主动服务模型中服务消息生成的研究

服务消息设计应充分体现"服务对象中心"的观念。不同服务对象对某一服务的关注重点和感兴趣部分往往是不同的,在设计服务消息时,应该针对服务对象的特定需要,突出介绍服务的各项特性中服务对象最感兴趣的内容,有效地将服务与服务对象的特定需求结合起来,以此来激发服务对象的消费欲望。     

Effective capacity: a wireless link model for support of quality of service

To facilitate the efficient support of quality of service (QoS) in next-generation wireless networks, it is essential to model a wireless channel in terms of connection-level QoS metrics such as data rate, delay, and delay-violation probability. However, the existing wireless channel models, i.e., physical-layer channel models, do not explicitly characterize a wireless channel in terms of these QoS metrics. In this paper, we propose and develop a link-layer channel model termed effective capacity (EC). In this approach, we first model a wireless link by two EC functions, namely, the probability of nonempty buffer, and the QoS exponent of a connection. Then, we propose a simple and efficient algorithm to estimate these EC functions. The physical-layer analogs of these two link-layer EC functions are the marginal distribution (e.g., Rayleigh-Ricean distribution) and the Doppler spectrum, respectively. The key advantages of the EC link-layer modeling and estimation are: 1) ease of translation into QoS guarantees, such as delay bounds; 2) simplicity of implementation; and 3) accuracy, and hence, efficiency in admission control and resource reservation. We illustrate the advantage of our approach with a set of simulation experiments, which show that the actual QoS metric is closely approximated by the QoS metric predicted by the EC link-layer model, under a wide range of conditions.     

面向云计算的服务性能模型研究

为了衡量云计算的服务性能。分析了云计算服务的处理过程,提出了一个以排队论为基础的云计算服务性能模型。以Amazon SimpleDB的更新延迟为例,仿真验证了该模型,并以此为基础,分析比较了模型中的关键因子。实验表明,提升服务装置的性能可以有效提升云计算服务的性能,且在云计算部署后期,虚拟机实例的性能是服务性能提升的瓶颈。     

OMCI协议下N:MP业务管理模型的设计

光网络终端(ONT)管理控制接口(OMCI)协议的研究对于吉比特无源光网络(GPON)网管系统的实现具有重要意义.文章介绍了GPON网管系统,对G.984.4 OMCI协议作了分析,并介绍了在此基础上对GPON网管系统中基于OMCI协议的N:MP业务管理配置模型进行的研究设计,阐述了单播业务配置模型的实现方案,并针对配...     

Impact of Galileo commercial service on location-based service providers: business model analysis and policy implications

Today's mobile location-based services (LBSs) largely depend on a free-of-charge, best-effort positioning technology, called global positioning system, which is controlled by the US military. The European alternative Galileo will not only offer a similar best-effort system by 2020, but also a premium-rate service known as Galileo commercial service (CS). Galileo CS is planned to provide higher positioning accuracy, improved security due to signal authentication and service guarantee. While the technology behind Galileo is often studied, the impact of Galileo CS on the LBS marketplace is rarely discussed. In this article, we fill this gap by analysing how improved accuracy, authentication and service guarantee may impact the business models of LBS providers. We do so by interviewing service providers, policy makers and industry experts on what new services would be enabled; technological alternatives that may emerge in the coming years; and organisational and financial issues that service providers face when adopting such a premium-priced positioning signal. We find that a more accurate, secure and reliable global navigation satellite system signal enables a range of new LBSs, although several alternative technologies are emerging that may make Galileo CS obsolete before it is even launched. To convince the LBS providers to adopt Galileo CS, the institution operating Galileo should get governments on board early on for building trust and should consider progressive pricing schemes. Still, service providers are sceptical about adopting Galileo CS, and the hope to recoup any investments in Galileo may thus be in vain.     

基于面向服务的多租户访问控制模型研究

在具体搭建面向多租户的平台过程中,传统访问控制模型在多租户环境下无法满足租户之间的隔离访问以及对各租户的访问请求实行有效的统一管理。为了在多租户环境下实现一套快速的、访问控制可配置的实施方案,提出一个面向服务的多租户访问控制模型。根据对多视图业务模型之间的关联进行分析,识别出组织模型及其相关的资源模型。通过映射和转换将组织模型转换为面向服务的多租户访问控制模型,并构建访问控制模块对系统进行配置,然后运行访问控制模型。最后,以某交通物流信息平台为范例验证了该模型的可行性和有效性。验证结果表明,模型能够在多租户环境下提供兼备快速配置与访问控制的实现支持。     

Congestion control mechanisms and the best effort service model

In the last few years there has been considerable research toward extending the Internet architecture to provide quality of service guarantees for the emerging real-time multimedia applications. QoS provision is a rather controversial endeavour. At one end of the spectrum there were proposals for reservations and per-flow state in the routers. These models did not flourish due to the network's heterogeneity the complexity of the mechanisms involved, and scalability problems. At the other end, proposals advocating that an overprovisioned best effort network will solve all the problems are not quite convincing either. The authors believe that more control is clearly needed for protecting best effort service. An important requirement is to prevent congestion collapse, keep congestion levels low, and guarantee fairness. Appropriate control structures in a best effort service network could even be used for introducing differentiation. This could be achieved without sacrificing the best effort nature of the Internet or stressing its architecture beyond its limits and original design principles. We revisit the best effort service model and the problem of congestion while focusing on the importance of cooperative resource sharing to the Internet's success, and review the congestion control principles and mechanisms which facilitate Internet resource sharing     

为半导体制造业提供可靠的硅设计链

在G1obalpress的2006电子峰会中,专题讨论会"为半导体制造业提供可靠的硅供应链"对半导体制造和硅设计业界有一定的启发性.     

Management of service level agreements for multimedia Internetservice using a utility model

The efficient management of a quality level of Internet service is becoming increasingly important to both customers and service providers. This article describes how service level agreements for multimedia Internet service can be managed and controlled. We first present a literature survey on the problems of SLA management: SLA parameter definition, SLA measurement, and QoS management. We present a utility model to capture the management and control aspects of SLAs for multimedia Internet service. This utility model has been used in microeconomics theory, but here we have applied it to SLA management. This model provides a computationally feasible solution for admission control and quality adaptation for multimedia Internet service and SLA management. It also allows management policies to be flexibly expressed by service providers. Finally, we apply the utility model to the SLA management of VoIP service and describe how to use it for admission control, dynamic quality adaptation, and resource allocation for SLA assurance     

三网融合业务模式分析

介绍了三网（电信网、广播电视网和互联网）融合的背景及概念,简单阐述了三网目前的状况和融合的态势,分析了三网在业务应用上融合的三种业务模式,指出需要通过技术上的不断进步和政策管制上的不断完善,从方方面面营造三网融合的良好环境：     

多策略QoS感知的服务选择与排序模型

随着网络中具有相同功能、不同QoS服务的增多,在用户请求服务时,为了确保能找到满足用户功能与质量要求的服务,并对找到的可用候选服务集按一定的策略进行选优,提出了一种多策略QoS感知的服务选择与排序模型。在该模型中,综合考虑服务的性能与运营维护成本等属性,提出了一个扩展的服务QoS模型,在此基础上引入用户、运营商对服务满意度的计算方法,通过改变用户满意度与运营商满意度在排序选优过程中所占的不同比重,灵活设置服务选优策略,有效的解决了服务排序选优问题。搭建了服务选择与排序原型系统,并通过应用实例对上述模型进行了验证。     

任务求解驱动的Web服务优选模型

针对某一决策(使命)子任务求解,存在具有相似功能的不同Web服务可供匹配调用时的服务优选问题。本文综合考虑服务的形式化描述中服务质量属性的内涵及参数量化的灰特征,参照服务的最理想(最佳、最满意)状态,运用灰色关联分析和熵值法构建服务优选组合模型;最后用实例验证了该方法的可操作性和实用性。     

指标模型服务的研究与设计

指标模型服务(iModel)是对信息化企业进行业务角色分析、业务流程分析、关键性能指标评价等一系列业务分析之后,抽取出来的可以为企业创造价值的不同层次的业务活动或功能,这些业务活动或功能可以作为一种可重用的资源。本文主要围绕信息化企业,阐述指标模型服务的内涵及任务,深入研究了指标模型服务的功能及相关业务,重点设计出指标模型服务的整体框架、业务处理流程、抽取-转换-加载(ETL)数据写入流程。可以帮助企业优化业务处理流程,提高信息化业务工作效率,符合当前信息化时代发展需求。     

COPS-SLS: a service level negotiation protocol for the Internet

The deployment of QoS over the Internet may achieve protocols for the negotiation of service levels, as well as mechanisms for the end-to-end realization of service level agreements. Such general-purpose protocols include Common Open Policy Service (COPS) for policy specification within a domain. This article proposes an extension of the COPS protocol for intra- and interdomain service level negotiation. The proposed protocol is known as COPS-SLS. This allows the configuration of domain policies regarding service levels, and the automatic negotiation of service levels within the domain policies     

VoIP reliability: a service provider's perspective

Voice over IP services offer important revenue-generating opportunities, as well as many technical challenges in providing high-quality services. Users have come to expect highly available telecommunications services with high-quality voice. Service providers need reliable high-performance networks to meet user expectations, and must be able to guarantee performance and reliability to their customers. In converged voice and data networks, the network infrastructure must deliver very high quality and availability for some customer needs, while also providing low-cost high-capacity bandwidth for other needs. The use of quality of service mechanisms to provide prioritization for various traffic types is a key element needed for voice and data network convergence. However, it is not sufficient if the underlying networks are unreliable. The focus of this article is to address the reliability aspects of VoIP services, including the underlying IP networks.     

Location-based service use: a metaverse investigation

The current trend in location-based services (LBSs) research is to focus on the development and deployment of LBSs. This research examines the different uses of LBSs based on a virtual environment. It is argued that using the real world method of developing and deploying LBS restricts the types of uses being developed and that an alternative approach might yield insight into what types of uses are possible and how it might change the thinking of LBSs developers. This research surveyed the Second Life metaverse to identify and categorise the types of LBS used and deployed in the digital world. The results of the survey found that many of the LBSs in SL provided intelligence to the avatar so that they could perform an action which they could not do without the LBS. It is clear that the topic of navigation is biased based on the digital nature of the SL metaverse and its use of the teleportation concept. But the results show that LBSs are ubiquitous throughout metaverse and the types of services go beyond those found in the real world.