基于JPEG2000的ROI编码在VDR中的应用

雷达图像存储模块是船舶航行数据记录仪(VDR)的关键组成部分之一。此文根据船舶航行特点和船舶避碰原理,研究了基于JPEG2000的雷达图像感兴趣区域(ROI)编码方法,这种方法在保证了图像重点区域无损压缩的基础上,对图像其他区域实行高比例压缩。试验表明:该方法对VDR中雷达图像压缩具有良好的效果。     

基于规范计算的油船中剖面优化设计

为降低船舶造价,最大限度地实现船舶的轻量化设计,基于船体尺寸优化的思想,以油船中剖面结构为研究对象,采用法国船级社规范计算工具Mars2000对油船中剖面进行结构定义和载荷计算,通过优化分析软件ISIGHT集成设计变量、约束条件、目标函数,建立参数数据流;开发基于协调共同结构规范（Harmonized Common Structure Rules, HCSR)计算的船舶尺寸优化系统,获得油船中剖面结构设计方案。优化后中剖面面积比原始设计减少6.4%,实现油船的轻量化设计。     

不规则波作用下斜坡堤越浪量试验研究

通过物理模型试验,研究不规则波作用下挡浪墙顶高度、宽平台长度及高度、波高和消浪墩等因素对越浪量的影响,发现挡浪墙、平台和消浪墩对减小越浪量有较好的作用。将现有计算越浪量公式值与实际物模试验值进行比较,推荐了越浪量计算方法。     

2000国家大地坐标系转换的技术方法

研究长江航道现行测绘成果向2000国家大地坐标系转换的模型,提出基于采用二维多项式逼近模型的转换技术路线。经检验,模型平均精度优于0.15 m,可满足小于1∶2 000比例尺航道图转换精度要求,为长江航道图转换到2000系奠定了技术基础。     

关于构建客专ZPW-2000A轨道电路有效实训方法的思考

客专ZPW-2000A轨道电路系统在高铁应用广泛,是核心基础信号装备之一;现场铺设整个传输环节长,分为信号机械室内设备和室外轨旁设备,种类繁多,尤其是室外电缆线路、钢轨线路参数受周边环境影响大,很难短时间内熟悉整个轨道电路系统。针对目前国内没有贴近实际现场应用的ZPW-2000A轨道电路培训系统的现状,提出一套执行性强的实训流程和方法,为现场一线维护单位快速熟悉该制式轨道电路系统、提升现场应急处理能力提供参考。     

钢-混凝土组合深梁填充钢框架动力弹塑性分析

钢-混凝土组合深梁填充钢框架是一种新型抗侧力结构体系.用有限元分析软件SAP2000对6层钢框架和6层钢框架填充组合深梁进行了动力非线性时程分析,得到结构的顶点位移、基底剪力、层间位移角、楼层位移及塑性铰发展情况.通过对比分析发现,钢框架内填深梁以后,结构刚度和承载能力增强,且深梁首先破坏,保证钢框架安全,充分起到了抗震第一道防线的作用.     

Transportation planning and quiet natural areas preservation: Aircraft overflights noise assessment in a National Park

Global transportation growth causes several disproportionate impacts on the environment as, for instance, noise pollution which is related to negative effects on human health but also to quiet natural areas decline and biodiversity loss. Besides, sound is a component of ecosystems severely threatened by transportation noise disturbance which is related to negative effects on ecosystem functions. This study deals with aircraft noise impact on natural environments from a multiple innovative perspective. It complementarily combines: noise modeling, field measurements, soundscape audibility, human perception and spatial pattern tools for assessing the chronic growing outdoor noise pollution of ecosystems at landscape scale. Firstly, noticeable soundscape degradation from aircraft overflights has been found causing severe acoustic fragmentation and disruptions in the quietness of a national park in Spain (European Union). Air traffic caused sound pressure levels to increase by approximately 8 decibels from natural ambient levels. Secondly, spatial pattern tools together with noise mapping have been found to be useful in providing decision support for decisions-making through anthropogenic noise impact assessment on the natural environment. Finally, public opinion did not perceive aircraft noise-disruption as being as relevant as that quantified by technical procedures. Although 82% of visitors agree that anthropogenic noise pollution may negatively impact on conservation.     

武广客运专线无砟轨道工程施工工艺与设备配套探讨

研究目的:武广客运专线建设在我国铁路建设史上具有重要的意义,其轨道工程应用了从德国引进的RHEDA 2000双块式无砟轨道系统技术,该技术对于我国还是一项新技术、新工艺,也需要使用新设备,目前没有一套系统成熟的施工技术,需我们在建设中边施工边总结以供今后借鉴。研究结果:根据武广客运专线工程实际,结合前期参与同德方技术交流和施工设备引进谈判的工作经历,提出了一套比较系统的施工方法,为武广客运专线无砟轨道工程施工提供参考。     

ZPW-2000A闭环电码化工作原理及试验方法浅议

本文介绍了ZPW-2000A闭电码化在铁路运营中的重要作用，并分别对工作原理及现场施工中的试验环节进行了分析，提出闭环检查条件应用于进出站信号机控制电路的必要性。     

Efficient Rate Control for Motion JPEG2000 under Constraint Memory

IntroductionRate control is essential to video transmissionthrough heterogeneous lossy networks and time-varying communication channels.In recent years,scalability has gained more attention as a highlydesirable feature of some video coders,such asMPEG-4and Motion JPEG2000.Scalability canprovide not only precise rate control for constantbitrate(CBR)traffic,but also accurate qualitycontrol for variable bitrate(VBR)traffic,whenthe coder adopts different rate control algorithm.The rate contr…