Petri网及其维修建模应用研究

Petri网描述异步并发的能力和形象直观的图形表示，使之成为系统维修过程模型描述的有力工具。文章在对Petri网的基本概念、模型描述方法作简要介绍基础上，分别就不可修系统、可修系统、维修资源共享、维修优先级以及维修费用等维修过程问题，进行了Petri网模型描述。     

SPN运用于对船坞监控系统的性能分析及研究

本文研讨随机Petri网（SPN）应用于对船坞监控系统的性能分析，文中描述了随机Petri网的定义及其性能分析方法，并结合一个船坞监控系统的实例，运用随机Petri网的性能分析方法，给出了该监控系统的随机Petri网模型和系统作业概况的标记概率和标志概率。实例表明：SPN模型及其性能分析方法，能为具有随机过程的系统提供一种十分有用的分析工具。     

随机高级 Petri 网对某型舰载机编队着舰起飞过程的动态仿真

舰载机编队着舰是一个典型的动态行为过程，航母甲板可看作是单跑道的降落（起飞）平台。Petri网是对离散事件动态系统进行分析建模的重要工具，利用其动态性可对舰载机编队着舰的进近过程进行描述。文中介绍了几种Pe‐tri网的定义，分析舰载机着舰流程，建立进近终端区模型，通过Petri网仿真器模拟动态效果，并给出结果。     

基于随机Petri网的网络化防空导弹系统建模方法研究

文章通过建立执行单任务的网络化防空导弹系统的随机Petri网模型,分析系统作战状态的变化规律,得到系统作战效能评估方法。在此基础上,建立了系统可执行多任务作战的复杂随机Petri网模型,实现了网络化防空导弹系统信息共享和作战资源间协同调配。     

船体曲面三角网格划分的并行性计算方法

采用前沿生成法对船体曲面进行三角网络划分、运用信号灯Petri网对划分过程进行控制和分析,使前沿结点的生成及其适应性计算并行处理,充分利用系统的分布、并发、同步异步等特性,以提高三角网格划分的效率;前沿结点的适应性计算采用改进的演化算法。     

基于复合模型的物流配送系统研究

物流系统中的配送系统是复杂的离散事件动态系统,本文利用面向对象技术和Petri网技术相结合的复合模型对关键的出入库业务进行建模分析,按面向对象方法对系统进行抽象分类,利用Petri网技术来记录事件动态过程,从而有效解决离散事件复杂,并发冲突等特性,以提升配送系统的整体运作效率。     

泛化Petri网及其在C^3I系统分析中的应用

对Ｐｅｒｉ网进行泛化描述，得到了更具推广意义一般化的泛化Ｐｅｔｒｉ网定义。它很使用用来描述具有各类包括模糊行为的并发系统，是信息系统、网络通信系统，运输系统、生产控制系统的描述工具。     

基于事件的舰载机出动回收作业流程建模方法

为构建基于舰载机出动回收作业流程剖面分析规范化的合理逻辑模型,采用IDEF0设计框架及Petri网工具对其进行离散事件建模,搭建工程经验与仿真模型间的桥梁。根据工程经验,依照面向过程的IDEF0设计框架,理清舰载机出动回收作业流程中各组件系统间的信息交互和互操作关系,完成活动模型,以明确该流程中的事件触发规则和顺序,并根据活动对应变迁、信息流对应库所的原则,构建舰载机出动回收作业流程Petri网模型,形成工程研制者及仿真研发者均能接受的舰载机出动回收作业流程逻辑仿真模型,该Petri网模型也可直接应用于舰载机出动回收作业流程离散事件系统的功能仿真。     

某型舰炮补供弹过程的Petri网描述

为了实现某型舰炮补供弹过程的计算机仿真,以便于对炮手进行科学的模拟训练,基于Petri网理论研究了该炮补供弹过程的建模问题.在对补供弹过程进行了分析与构建了补供弹过程Petri网结构的基础上,将Petri网的变迁与具体操作相关联,与真实操作相一致,建立了基于Petri网行为模型,并对其作了详细的说明.该模型为进一步研究补供弹过程的仿真打下了理论基础.     

维修保障中资源调度的petri网建模研究

维修资源是维修保障系统的重要组成部分，维修资源调度效率的高低直接影响着保障能力和维修活动的经济效益。在Petri网建模理论的基础上，深入分析维修保障活动的特点，给出了针对维修资源调度的Petri网建模的基本方法和步骤。采用Petri网建立了维修资源调度的两种模型，并重点研究了MT—Petri模型的建模过程和工作原理。     

Errata

正In the paper"Influence of Fouling Assemblage on the Corrosion Behaviour of Mild Steel in the Coastal Waters of The Gulf of Mannar,India"in Vol.12,No.4,Page:509,References were lost,and the two authors’biographies were identical.The correct text is shown below.We apologize to the authors and our readers for any inconvenience caused by the errors.     

Journal of Marine Science and Application 2014 Sum. Contents

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第34届海洋、离岸及极地工程国际会议(英文)

正St.John's,Newfoundland,Canada,May 31-June 5,2015 OMAE2015 is the ideal forum for researchers,engineers,managers,technicians and students from the scientific and industrial communities from around the world to: meet and present advances in technology and its scientific support;     

联合作战计划和执行系统

全球指挥控制系统(GCCS)实施当前美国海军网络中心战信息基础设施的联合计划网络。联合作战计划和执行系统(JOPES)支持GCCS实现联合计划。JOPES有两类计划：时间不限的精密预案计划生成作战计划、方案计划或职能计划；时间敏感的危机行动计划生成作战命令或战役方案。前者在和平时期创建的作战计划是后者的计划基础，加速应付危机的能力。     

Eastbound or westbound ?

In terms of equal sailing distances, where is the inflexion when ships depart from ports in the Asian Continent to New York via Suez and/or Panama？
The answer is China South Port Group （Hong Kong, Shenzhen and Guangzhou）.     

Recent progress on wave induced loading measurements in warships

Recent measurements of wave induced hull strain and flexure in RN warships are presented together with the derivation of the current design criteria for extreme hull girder bending loads. The history of the development of the shipboard instrumentation used is given and recent developments to improve the quality and ease of analysis of the data are described. An unexpectedly high transverse asymmetry in the longitudinal strains measured in destroyers is shown to be the result of a combination of vertical and lateral bending in oblique seas. Finally recent theoretical comparisons between the loading of Deep-Vee hulls and conventional UK rounded bilge hulls are presented which demonstrate the higher loading experienced by this type of hull form.     

桥梁防撞设施物理模型试验

物理模型试验是预报防撞设施所受撞击力及优化设计方案的主要方法之一。结合杭州湾大桥柔性防撞设施及东海大桥独立式防撞体设计方案,阐述了船—防撞体撞击试验的基本原理、方法、试验方案及相关试验结果。提出了柔性防撞系统的优化方案。试验结果表明,该方案经济有效,可供预报类似桥梁防撞设施撞击力时参考。     

印尼某电厂码头水工建筑物设计

印尼某电厂项目码头水工建筑物包括码头、防波堤和护岸等主要组成部分。在该项目水工建筑物的设计过程中,综合考虑当地的自然条件、施工能力和材料来源等因素,不断优化结构选型和结构断面。根据不同使用要求,护岸分别采用直立式和斜坡式2种结构型式,推荐的设计方案节省投资、施工方便,可供同类工程设计参考。     

Impact of regulation on the performances of long-distance transport services: A comparison of the different approaches in Sweden and Norway

Despite the many socio-economic similarities between Sweden and Norway, differences in jurisdiction, organisation, cooperation, and financing of long-distance passenger train and coach services have led to the development of four distinctively different ways of serving the markets. This paper describes how the train and coach markets have developed in the two countries, with emphasis on regulatory and industrial structure and a couple of performance variables.Looking at passenger rail, both countries separated infrastructure from operation over a decade ago. However, while Norwegian rail is characterised by an almost monopoly supplier, rail services in Sweden are partly decentralised to the responsibility of county authorities and are widely subjected to competitive tendering. The rest of the network is about to be opened up for on-the-track competition. Swedish Rail (SJ) has spent the last decades consolidating its core business (passenger rail) and sold out its other businesses. In contrast, the Norwegian state rail (NSB) has expanded its business to become a major bus operator and property owner, with extensions also into the Swedish market.The coach industry was more recently deregulated in both countries. The Swedish coach market is dominated by privately owned companies operating services to and from Stockholm. In Norway, state-owned NSB is a major coach operator on medium distance routes, and is also the largest partner of Nor-Way Bussekspress which totally dominates long-distance coach services. Further, the Norwegian coach market is characterised by cross-ownership and cooperation which has enabled an extensive route network which covers most of Norway.We find distinct differences in achievements in the two modes and in the two countries. Swedish rail services have succeeded in winning market shares and in renewing and developing both infrastructure and service levels to a greater extent than the Norwegian model. On the other hand, the Norwegian coach market seems to be more developed and efficient compared to its Swedish counterpart.The paper concludes with a discussion on the possible links between the different approaches and the performance observed, with the aim to stimulate further and more detailed research on some important issues.     

开放式数据挖掘系统模型

目前国内已经出现了少量的数据挖掘相关产品。国内数据挖掘软件无论从数量还是质量上比较，都与国外软件存在着较大的差距。随着数据仓库技术的普及，数据挖掘应用的需求越来越强烈，如何缩短这种差距，研发数据挖掘软件产品成为国内业界的一个重要问题。通过引用目前国际通用数据挖掘标准技术来构建开放式的数据挖掘系统模型，该系统模型从可扩展性、可重用性、易用性等方面得到了加强。