VxWorks环境下组合导航实时通讯软件的设计

针对组合导航系统的具体组成结构，提出了组合导航系统实时通讯的具体要求。在分析了VxWorks的多任务环境和中断特点后，利用TCP／IP协议支持的套接字实现了网络通讯编程，利用VxW池提供网络函数实现了双网卡冗余备份，完成了基于VxWorks的组合导航实时通讯软件的设计。     

徒骇河坝上闸下游通航研究

建立了徒骇河二维潮流数学模型,模型采用数学物理方法,将不规则域下求解变换成矩形规则域下求解,计算中,首先采用天然实测资料对模型进行率定,通过有关参数调整,使数值计算成果与天然实测资料达到精度要求。然后通过对自然状态下潮流过程的模拟,分析河段通航条件以及潮位、潮流特征。随后对航道不同疏浚方案和取水条件与潮流的相互影响进行计算,研究航道不同疏浚方案引起的潮流变化。最后采用分析方法,对航道不同扩建方案的回淤以及取水口最大取水能力进行预测。     

虚拟航标系统的开发与仿真

探讨了虚拟航标系统的实现方法,基于VB和MapX开发了虚拟航标系统的应用软件。使用AIS设备对虚拟航标进行了仿真,在电子海图显示终端可视化监视本船和虚拟航标之间的关系,并在航行过程中借助电子海图空间分析函数来判断虚拟航标与船舶之间的距离,并对航路起实时监视的作用。仿真结果证明了论文所采取的实现虚拟航标系统技术路线的可行性,为今后实船论证虚拟航标系统提供了理论基础。     

关于航海仪器实训课教学改革的思考

随着科学技术的飞速发展和航海教育改革的不断深入,我院现有实训室的规模已不能适用或不能满足学院教学改革的推进和扩大招生的需求,需要重新加以审视和规划,以使实践教学能充分发挥其作用。航海仪器实训课应充分运用多媒体技术,提高课堂教学效果。     

基于Vxworks操作系统的航路点导航系统研究

针对现代船舶航行高精度、高可靠性要求设计了航路点导航系统,给出了航路点导航系统结构模型,详细阐述了系统的设计过程,并结合船舶航行实际情况深入研究了求船舶航行目标航路点算法和坐标系转换问题。     

Effect of variable message signs on driver speed behavior on a section of expressway under adverse fog conditions—A driving simulator approach

Variable message signs (VMS) are used to provide dynamic information and one current application is to show different speed limits under different conditions. As speed is an important contributor to road accidents and also affects driver speed behavior, the present study focuses on how effective traffic advisory information is when helping drivers to divert from potentially dangerous conditions. Graphical representation of an Expressway section made it easy to isolate the effects of speed etc. by drivers with information provided through VMS under adverse fog conditions. Understanding and reacting to the VMS system by drivers is essential for its success. If drivers do not react by changing speed behavior then the VMS system will fail and further implementation may cease. In this paper an Analysis of Variance model, which is appropriate to the proposed experimental conditions, is used to study how subjects (drivers) will perceive provided information and also to find the effect of VMS on driver speed behavior on the simulated Expressway section.     

数据挖掘技术在海流要素辅助船舶导航中的应用研究

海流对船舶导航、航行安全影响较大.本文在对海流研究成果和海洋环境数据库进行深入研究的基础上,详细考察了船舶在航行过程中对海流信息的应用环境及需求.为提高业务化应用能力,采用模式分析等数据挖掘技术,提出了实测数据融合的技术方案,给出了海流要素辅助船舶导航的应用模式.最后,以电子海图系统为平台,初步建立了海流要素辅助航迹模拟、船位校正等应用系统.     

船舶自动识别系统在航海领域的应用前景

随着IMO的相关规则的强制要求,船舶正在全面配置AIS设备。针对AIS的结构和功能,主要探讨了船舶配备AIS后对船舶航行安全可能带来的积极影响,并展望了其在航海领域的应用前景。     

The trophic state of the Baltic Sea a century ago: a model simulation study

We apply a 3-D circulation model with a biogeochemical module (ERGOM) for the simulation of trophic conditions in the Baltic Sea a century ago. One aim is to provide reference or background data for nitrogen, phosphorus and chlorophyll, which is required for the implementation of the European Water Framework Directive (WFD). We assume that the situation a century ago serves this purpose well. Model input for this long-term simulation study are the regionally differentiated riverine and atmospheric nutrient loads to the Baltic Sea, which were compiled and calculated for a situation 100 years ago on the basis of various literature sources. For the mixed surface layer of the open Baltic Sea, we suggest maximum winter concentrations for dissolved phosphorus (dissolved inorganic nitrogen) of 0.23–0.35 (2.7–3.7) mmol/m³. Maximum chlorophyll-a concentrations are between 1.8 and 2.4 mg/m³. The concentrations of all parameters for different coastal waters vary in a wide range, depending on exposure to nutrient sources. Our nutrient concentrations for the situation a century ago are close to early measured data (1950–1960) and suggest that this data is suitable as reference data, as well.     

PDA在航海上的应用与开发

具有小巧便携特点的PDA必将被广泛地应用于航海及其相关领域。本文在系统地介绍了PDA的特点、功能、操作系统、开发软件及其发展趋势的基础之上,介绍了以此为平台开发的航海综合计算程序的设计思想、主要功能等,最后对PDA在航海及相关领域应用进行了展望。