优化的蚁群算法和船舶电网系统云数据聚类和实现

首先分析蚁群聚类算法,并指出其存在的问题;然后给出传统的蚁群聚类算法在船舶电网云数据聚类的实现流程,针对算法中存在的问题,提出利用惯性因子、随机初始化等方式改进和优化算法对船舶电网故障进行诊断;最后通过实验进行说明,优化后的蚁群聚类算法与K-mean算法、粒子群K-mean算法相比具有较好的收敛性。     

一种基于K-means改进蚁群算法的船舶航线设计方法

文章提出了一种基于K-means改进蚁群算法的船舶航线设计方法。首先利用Kmeans算法对栅格化海图情况进行聚类,模拟真实海况并得到多个具有区分特性标识的栅格类;然后将每一个类分别看成一个独立的TSP问题(Traveling Salesman Problem,旅行商问题),将蚁群算法应用在每个类内部和类之间,从而规划出一条船舶航线最短且能够安全避障的优化航线。通过仿真实验结果对比表明,该算法能够有效完成航线规划任务,并具有精度高、计算速度快等特点。     

基于粒子群K均值聚类的空中目标识别

舰艇编队面临的空中威胁日益复杂多样,正确、快速地识别目标是赢得对空防御作战的前提。在分析各传感器测量得到的空中目标威胁特征指标的基础上,将舰艇编队防空作战目标识别问题转化为最优聚类问题,建立基于粒子群聚类的目标类型识别模型。通过主成分分析将样本各特征值标准化、降维投影到新的特征空间,引入粒子群优化算法构建最优聚类识别模型,实例分析表明该方法有效,计算速度快,降低了实用的复杂度,提高了目标识别的可靠性。     

基于蚁群算法的船台吊装网络优化技术研究

船台吊装网络优化涉及到船台设备和吊装工艺的双重约束,是一种典型的NP难题.根据船厂制造网络优化的需求,提出了一种适合蚁群算法的船台网络模型,在此基础上实现了船台网络优化的蚁群算法,以实现吊装进度安排的优化.该方法具有蚁群算法的全局优化特点,可以很好的解决实际工程问题,最后通过一个算例,进一步说明了这种方法对于解决船台吊装网络优化问题的有效性.     

基于模式识别的船舶异常行为自动报警方法

不能自行判断船舶异常行为,并根据判断结果完成自动报警,是现阶段船舶航行面临的主要问题。为有效解决此问题,建立基于模式识别的船舶异常行为自动报警方法。通过识别相似度的确定、与船舶异常行为关系的确定,完成基于模式识别研究角度的确定。通过船舶异常行为聚类、聚类异常行为识别,完成上述方法的搭建,并确定该方法是否可以完成自动报警。设计对比实验结果表明,应用该方法后,节省检测船舶异常行为所需人力资源,且提升识别准确性。     

船舶构件快速识别技术的研究

本研究通过分析、提取船舶二维图纸中型线的特征,建立能表达型线信息的属性向量,在此基础上提出了一种船舶结构快速识别的方法,即将自组织特征映射神经网络(SOM)的方法运用于图形的识别和聚类。进一步的,运用自顶向下分层识别技术,通过一次或多次识别及判定实现对二维图纸设计信息的提取。以此为依据开发完成了船舶结构智能识别系统。通过对某船某肋位横剖面图的识别,检验了该方法的可行性和系统的实用性。     

模糊聚类在柴油机故障诊断中的应用

柴油机状态监测与故障诊断可以看作是一种故障模式的识别过程,模糊聚类方法是模式识别方法的一种,本文利用模糊C均值聚类方法对表征柴油机状态的特征向量进行模式识别,结果表明该方法可通过特征参量准确地区分不同的柴油机故障模式,模糊聚类方法在柴油机状态监测与故障诊断中有较好的适用性.     

有标记的文本聚类方法研究

聚类分析是一种模式识别无监督的分类方法。对于根据类别先验知识已经分类的文本,提出一种有标记的文本聚类分类方法。这种方法是在模糊聚类算法基础上进行了改进,通过有标记的文本样本,利用模糊聚类算法提取分类规则,然后用模糊推理方法进行分类的一种算法。文中讨论了此算法的具体数学模型,给出了算法流程。并通过实验验证了这种聚类方法是一种有效的文本分类手段。     

基于粒子群优化的聚类入侵检测算法

为了在入侵检测中有效地克服传统的K均值算法易陷入局部极小值的缺点,使算法具有较好的全局收敛性,将粒子群优化算法应用于入侵检测,给出了基于粒子群优化的K均值聚类算法．通过理论分析及实验,验证了基于粒子群优化K均值聚类算法的有效性．对KDD CUP99数据集仿真,实验结果表明,该算法在入侵检测中能获得理想的检测率和误检率．     

基于改进蚁群算法的物流配送路径优化问题研究

物流配送在国民经济中发挥着越来越重要的作用,先进的物流配送系统是企业增强竞争力的重要手段.而进行物流配送系统的优化,主要就是配送路径的选择.虽然蚁群算法已广泛应用于解决路径优化问题,但此算法所固有的收敛速度缺陷一直制约着物流系统配送路径优化问题的解决.本文在系统分析蚁群算法的基础上,结合遗传算法,提出了一种新型的改进蚁群算法,并通过算例对改进蚁群算法的有效性进行了验证.     

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

正~~     

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。