Web服务的替换分析

Web服务合成是Web服务研究领域的热点问题,Web服务的替换与Web服务合成密切相关。Web服务的替换对于Web服务合成系统的健壮性是非常重要的。文章使用进程代数作为形式化的分析工具描述Web服务,为Web服务建模,并提出为保证替换后服务合成仍然是正确的所要满足的约束条件。     

Incorporation of customer satisfaction in public transport contracts – A preliminary analysis

The design of public transport contracts provides an opportunity to define service quality standards to which an operator can be held accountable. While the specification of service quality standards is a common practice, the relationships between the specifications and customer satisfaction are often methodologically unclear. Based on a South African case study, the paper uses data collected from a group of passengers who have personal cars but choose to use public transport, and a control group of passengers who only use their cars, in the same corridor as the user group, to estimate a service quality conjoint model. The model is used to evaluate the effect of different public transport service packages, defined in terms of different combinations of service attributes, on passenger satisfaction. The paper confirms the need to classify service attributes in terms of their relative impact on passenger satisfaction, at the service design stages, where performance in respect of some attributes has a disproportionate impact on satisfaction, especially where public transport is competing directly with private transport. Practical applications and limitations of the methodology are also discussed.     

出行者特征要素对公交服务模式的影响分析

公共交通是面向大众的服务,公共交通服务模式的制定与完善需要重点考虑出行者的出行需求,才能从根本上提高公共交通的竞争力。借鉴服务经济学的理论将公共交通服务模式分为公交服务标准、出行者界面、公交服务环境和技术4个维度。基于攀枝花市居民出行调查与公交专项调查数据,应用SPSS定量分析出行者特征要素与公交服务选择的相关性,以考察研究出行者对于公交服务的需求,并提出改善策略。通过研究表明,出行目的、出行时间、职业和年龄与公交服务模式的相关性较大。     

集装箱航运服务组合拍卖模型研究

根据运输的“范围经济性”原理,阐述了集装箱航运服务组合拍卖的适用性,围绕价值因素和价值评价因素,分析了集装箱航运服务组合拍卖的比较优势,结合集装箱航运服务的特点,以拍卖者效用最大化和投标者总估值最大化平衡为目标,设计出了组合拍卖的机制和运作程序;针对组合拍卖中的竟胜标问题,建立了集装箱航运服务组合拍卖的一般优化模型,并通过引入集装箱航运服务质量属性参数和运量限制等约束条件,对其进行了改进。从而为实现集装箱航运服务在线拍卖提供理论支持和计算平台。     

我国第三方物流服务创新的路径和策略选择研究

分析了当前我国第三方物流服务发展存在的物流服务内容单一、基础物流服务效率低下、物流服务质量不高等5个方面的主要问题.指出我国第三方物流服务创新的路径是提升物流服务层次,促使第三方物流服务往高端化发展.并给出了物流增值服务策略、物流绿色化服务策略等4个大方面的策略选择.以宝供物流企业集团为例作了论证.     

Analysis of collapse resistance of offshore rigid frame - Continuous girder bridge based on time-varying fragility

In service period, the key to ensure the service performance of bridge is to control its material durability damage and continuous collapse better. Nowadays, most anti - collapse analysis under earthquake is for the frame structure, the theory and method of anti - collapse analysis of bridge is not systematically summarized. Taking a 4 - span rigid frame - continuous girder bridge in offshore seismic prone region as an example, a new quantitative criterion for collapse resistance was proposed based on theoretical fragility, reliability theory and concept removal method of components, which is suitable for the example bridge. The results show that the time-varying durability damage and time-varying bond - slip effect on mechanical properties of materials can't be ignored in service period; the fragility and importance coefficient increase with service life, while the robustness coefficient decreases with service life, the different optimization algorithms all improve their corresponding parameters; when the bridge reaches its designed service life, its robustness coefficient is about 25% of that of the new, when the bridge exceeds the designed service life, its robustness coefficient decay rate is low, and the residual robustness coefficient is about 18%, the bridge still has certain anti - collapse performance.     

船舶进出港的安全时距对散货港口服务水平的影响

船舶进出港安全时距是控制同向进出港船舶尾随时间的安全参数,是关系到沿海港口服务水平的重要因素之一.目前国内部分散货港区由于单向航道通过能力的限制,导致港口服务水平严重下降,为缓解航道拥堵、提高港口服务水平,利用Arena软件构建港口生产作业系统的仿真模型,研究安全时距的变化对港口服务水平的影响,并应用于具体工程案例的仿...     

Testing the SERVQUAL scale in the passenger port industry: a confirmatory study

A key question is whether the service quality instruments developed for other services’ industries may be used to gauge service quality perceptions in shipping. Grounded on similar studies that test the most widely used American service quality instrument, SERVQUAL, in the commercial shipping sector, this study examines its applicability in the passenger shipping realm. Based on a survey of 436 passengers in Piraeus port, SERVQUAL's five main dimensions have been checked regarding their fit with the use of Confirmatory Factor Analysis. Results support that this is a valid instrument for measuring service quality in passenger shipping besides certain considerations regarding its dimensionality. A more parsimonious two-factor model seems more applicable and should therefore be also considered. Finally, it is evident from the study that passengers place more importance to the physical than the interactive elements of service to form their overall satisfaction.     

基于MPLS的网络服务定位研究

由于现在讨论的网络服务定位基于IP网络，这样就不可避免地受到现有IP网络的缺陷的影响。而MPL8技术很好的弥补了IP网络的很多缺陷，因此，在很多的IP网络的应用领域，MPL8都有一席之地。于是提出了基于MPL8网络的服务定位技术来解决现有的网络服务定位技术的服务质量问题。     

概率性能基础的使用寿命设计

氯盐环境下钢筋混凝土结构过早被破坏,很多因素影响混凝土的使用寿命,这些因素随着环境和时间而变化,是随机变量,应采用数理统计方法处理或采用荷载抗力分项系数法设计,在使用寿命设计中,输入一个代表值进行计算,如果这个数值是该变量的平均值,计算结果的使用寿命只有50%的保证率。如果按95%的分位数取扩散系数值,各影响因素(包括扩散系数)用分项系数来反映可靠指标,则可提高使用寿命保证率到95%,但目前使用寿命设计具有不确定性,在结构使用期间应对结构性能进行跟踪维护,对有关性能进行定期检验,据以进行使用寿命再设计,也许进行多次再设计,以确保结构有设计要求较长的使用寿命。     

Designing Electrical Power Systems for Survivability and Quality of Service

The primary aim of the design of a shipboard electric power system has traditionally been survivability and continuity of the electrical power supply. Survivability relates to the ability of the power system, when damaged by a threat, to support the ship's ability to continue its missions. Power continuity relates to the ability of the power system to reliably provide power to ship systems under normal operations. This paper proposes new metrics for survivability and continuity of service that enable a better definition of power system requirements linked to the operational needs of the ship. For survivability, the threats for which a ship is designed are its design threats, and the required residual capability following damage from a design threat is the design threat outcome. Quality of service serves as a metric of the continuity of the electrical power supply under normal operation. Quality of service is measured in terms of a mean time between service interruption. A service interruption is defined as any interruption in the supply or deviations outside normal bounds of power quality that prevent a load from performing its assigned function.     

船舶遮蔽航区变更为沿海航区的检验要点

船舶如何从遮蔽航区升级改造为沿海航区是近期的热点话题。文章结合辖区内一艘自卸运砂船的航区变更检验工作,阐述自卸运砂船从遮蔽变更为沿海航区应重点考虑的问题以及检验要点,对船舶的航区变更检验工作有所帮助。     

面向服务的信息栅格组件框架技术研究

在分析几个代表性网格系统的基础上,通过对信息栅格应用流程建模,抽取信息服务模型,设计了一种基于主流信息服务的栅格组件框架,实现了服务管理、注册、消息映射和服务同步等技术,支持栅格信息服务的快速和标准化开发与部署.     

桂林市综合运输服务体系研究

桂林市以区域交通枢纽为发展定位、建设国际旅游胜地为发展战略,未来将带来客货运量的稳步增长。针对由此对综合客货枢纽场站设施、运输服务所提出的更高需求,立足于桂林市经济社会发展和旅游城市特色,从综合客运枢纽、货物集疏运中心、运输服务信息共享、运输组织模式、运输服务工作机制、运输服务标准规范等方面进行系统研究,通过推进区域综合运输协同、城市内外交通协同、城乡客货运输协同,构建与桂林城市发展相适应的“衔接顺畅、服务优质、支撑有力、管理规范”的综合运输服务体系。     

我国第三方物流服务的发展现状与问题研究

近年来我国第三方物流发展迅速。从我国第三方物流服务市场供需两方面阐述我国第三方物流服务的发展现状。分析我国第三方物流服务发展存在的物流服务内容单一、基础物流服务效率低下、物流服务质量不高等5个问题。     

结构完整性管理在海洋平台延期服役评估中的应用

结构完整性管理是为保证钢结构从安装到退役全生命周期过程的适用性评价系统。依据结构完整性管理的基本要素数据、评价、策略和程序,对渤海海域某延期服役平台导管架结构进行评估,提出延期服役改进措施和后期服役的监测重点,为延期服役平台的结构评估提供借鉴和参考,具有重要的现实意义和推广价值。     

内河水上服务区布局选址方法研究

首先研究了内河水上服务区功能，提出了服务区布局选址原则与步骤，然后在此基础上构建了多目标优化评价指标体系，建立了基于神经网络模型的服务区布局选址优化数学模型。通过对模型优缺点分析，表明运用该方法所得出的服务区布局选址结果具有较好的客观性，避免了单纯依据经验判断带来的主观臆测性，并可推广至类似工程的布局选址实践中。     

电子装备维修管理系统的设计与实现

根据目前装备维修管理的局限性,设计了装备维修管理系统,该系统能实现对装备数据、维修资料、维修记录和备品工具等进行管理、查询,为装备的维修管理提供极大的方便,提高了装备故障检测维修效率,具有较高的应用价值.     

基于不确定需求的港口柔性靠泊计划

港口生产系统中存在许多不确定因素,实施高度灵活、富有弹性和对市场需求能够快速响应的港口生产柔性化战略,有利于提升港口综合竞争力,推动港口发展和升级换代.在分析基于不确定需求的港口柔性靠泊服务需求的基础上,研究港口柔性靠泊计划,建立了柔性靠泊计划模型.该模型引入非对称性田口损失函数来衡量服务损失的大小,实现在保证一定服务水平(满意率)的前提下,港口的服务损失最小,即所有在港船舶的时间(费用)损失最小.     

基于Web service的企业协同集成改进方案研究

从企业协同集成的实际需求出发,针对企业传统集成技术的缺陷,引入了基于可扩展标记语言XML(Extensible Markup Lanquaqe)的Web service技术的体系架构,并且利用这一技术分析了基于Webservice的企业协同集成解决方案,同时在此基础上提出了改进方案,最后给出了实施Web service的思路和方法。