共查询到18条相似文献,搜索用时 390 毫秒
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文章提出了一种用于超带宽无线通信系统的天线结构,即在介质基片的接地板上开圆环缝隙,采用微带线耦合馈电方法设计,并通过仿真分析和加工实测,证实该天线性能满足超带宽无线通信系统对天线的要求。 相似文献
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王虎军 《华东船舶工业学院学报》1998,12(4):73-91
提出了一种改进的多总线网络,称为K级局部多总线PMBK,它权衡了性能降级的可接受性和容忍度,分析了PMBK系统的代价、复杂度和有效内存带宽,还详细地分析了MBK和PMBK互连网络的可靠性和带宽可用性。 相似文献
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王虎军 《华东船舶工业学院学报》1996,10(3):27-30
本文详细地分析了拥有优先级的基于群的交叉开关多处理机系统带宽性能,获得的带宽模型基于各处理机产生的访存请求均匀分布,结果表明:虽然单个处理机的性能依赖于它的优先级,但是优先级的存在与否对整个基于群的交叉开关系统的有效带宽不产生影响。 相似文献
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王虎军 《华东船舶工业学院学报》1997,11(1):29-35
本文分析探讨了N〉M及N〈M时的带宽静态模型和动态模型,这两个模型是在基于处理机拥有偏爱存贮器模块的条件下获得的,为了验证模型的正确与否,笔者进行了仿真实验,结果表明,动态模型与仿真结果吻合得很好。 相似文献
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随着大型舰船点播用户数量的增加,高清2k、高清4k、蓝光等高质量的视频点播节目的相继推出,视频点播业务所占用的存储空间和网络带宽需求越来越大。而在舰船特殊的应用环境中,网络传输带宽有限,网络环境复杂,目前常规网络架构的闭路电视不能满足日益增长的视讯业务发展的需求,点播用户数受限。基于此,文章介绍了舰船闭路电视系统的发展,阐述了一种基于P4P(Proactive network Provider Participation for P2P)架构的舰船闭路电视系统,对系统实现相关的几个关键技术进行了分析,对系统工作原理、系统架构和网络拓扑等功能设计进行了说明。 相似文献
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为了提高船舶航行的安全性,并为船舶的日常管理和安全救助提供指导和帮助,提出建立基于无线网路(CDMAIX)的船舶监控系统.该系统利用CDMA1X无线网络传输船舶GPS动态信息和MPEG-4视频信息,集船舶动态监控和视频监控于一体.针对岸上因特网与船舶局域网用户的不同带宽.使用一种视频分级传输架构,对不同带宽的用户发送不同质量的视频流.同时为了提高视频无线传输的速度和质量,采用多路CDMA1X信道捆绑拓宽带宽技术传输船舶视频信息.渤海湾烟大线(Yantai-Dalian)客滚船上的实际测试表明:该系统完全满足近岸船舶监控的实际需要. 相似文献
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Hideko Terada 《Maritime Policy and Management》2002,29(1):3-15
This article is concerned with an analytical summary of how the Japanese container ports have been taking place overcapacity problem in a systematic way. It focuses on institutional aspects of the overcapacity problem from the viewpoint of accounting cost and opportunity cost. The first issue arises due to the port authority's accounting system and insufficient disclosures of financial statements of port business to the port users and taxpayers. The second issue is inherently related to resource allocation between the state government and local governments through the budget system and income distribution programmes. Since a proper allocation of economic resources in the port sector as a whole will depend on investment decisions being taken within a coherent framework for ensuring that costs are passed on to port users, these issues are closely related to each other in reality. Although the budget system is completely controlled by the state government, the local governments have authoritative power over port planning, financing, and management, which is assured by the Ports and Harbours Law. The overcapacity problem appears to be an inevitable result. 相似文献
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Hideko Terada 《Maritime Policy and Management》2013,40(1):3-15
This article is concerned with an analytical summary of how the Japanese container ports have been taking place overcapacity problem in a systematic way. It focuses on institutional aspects of the overcapacity problem from the viewpoint of accounting cost and opportunity cost. The first issue arises due to the port authority's accounting system and insufficient disclosures of financial statements of port business to the port users and taxpayers. The second issue is inherently related to resource allocation between the state government and local governments through the budget system and income distribution programmes. Since a proper allocation of economic resources in the port sector as a whole will depend on investment decisions being taken within a coherent framework for ensuring that costs are passed on to port users, these issues are closely related to each other in reality. Although the budget system is completely controlled by the state government, the local governments have authoritative power over port planning, financing, and management, which is assured by the Ports and Harbours Law. The overcapacity problem appears to be an inevitable result. 相似文献
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损耗因子是进行振动计算分析时必须输入的关键参数之一,直接影响振动计算和分析结果的准确性和可靠性。而传统的半功率带宽法和衰减法由于各自的局限性而无法得到理想的结果。该文将曲线拟合应用于时域衰减法测量损耗因子的数据处理中,通过理论分析、信号预处理、曲线拟合,准确地计算出激励频率下试件的损耗因子。通过与传统方法计算结果的比较,证明该方法在损耗因子小于0.01的小阻尼情况下具有精度更高、稳定性更好以及抗干扰能力更强的优点,可应用于损耗因子的衰减法测量中。 相似文献
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针对船舶企业与工程分承包方合作模式中的外包工程队管理中越来越显现的问题,对船舶企业外包工程队的分配方式进行分析,提出有效分配方式———绩效制,希望通过改进分配方式入手提高外包工程队的管理水平,适应船舶企业的生产外包需要。 相似文献
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笼形结构通过等效加粗导线直径可降低甚低频T形发射天线的特性阻抗,改善输入阻抗特性,展宽天线工作带宽。文章采用矩量法计算了笼形与线形两种甚低频发射天线结构、不同笼直径、不同顶线长度天线的输入阻抗特性,并进行了分析对比。 相似文献