船舶燃油自动化测量的若干问题

本文叙述了目前船舶燃油舱柜内油料测量的现状以及存在的问题，指出自动化测量系统应按油舱柜形状和油料种类选用适合的传感器，此外对温度分布修正、油舱纵倾修正、及其计算方法等进行了讨论。     

自动交换光网络在铁路通信中的应用

介绍自动交换光网络的结构组成和传输、控制、管理平面,黄万线铁路工程采用ASON(自动交换光网络)特性的增强型MSTP(多业务传输平台)设备——OptiX OSN 2500/1500设备组网,为国内首次在铁路通信网中的应用。     

道路冻胀翻浆机理及防治

对我国北方地区最大的公路病害——道路冻胀翻浆的成因、危害程度均作了详细的论述。并从理论上和设计、施工方面提出了切实可行的防治措施，对公路工程的设计、施工具有广泛的指导意义和实用性。     

预应力锚索在桥台病害治理中的应用

对桥台产生翼墙外倾病害原因进行分析，提出采用预应力锚索对桥台进行加固，并介绍了预应力锚索的施工过程及注意事项。     

北同蒲恒山余脉越岭选线

北同蒲新建铁路工程经恒山余脉越岭,地形、地质条件较为复杂。通过区域地形研究、区域地质勘察,在初步选定越岭范围内,综合各方面因素对几个不同越岭位置的方案进行分析比选。     

客运专线自动售检票系统设计探讨

自动售检票系统是最大程度地方便车站旅客购票、检票，减轻售票员的劳动强度，减少车站定员，并为客运公司提高客票业务综合管理水平。本文介绍了系统设置原则、系统构成、系统功能、票制票务管理、电源及接地。     

A bintree energy approach for colour image segmentation using adaptive channel selection

A new hierarchical approach called bintree energy segmentation was presented for color image segmentation. The image features are extracted by adaptive clustering on multi-channel data at each level and used as the criteria to dynamically select the best chromatic channel, where the segmentation is carried out. In this approach, an extended direct energy computation method based on the Chan-Vese model was proposed to segment the selected channel, and the segmentation outputs are then fused with other channels into new images, from which a new channel with better features is selected for the second round segmentation. This procedure is repeated until the preset condition is met. Finally, a binary segmentation tree is formed, in which each leaf represents a class of objects with a distinctive color. To facilitate the data organization, image background is employed in segmentation and channels fusion. The bintree energy segmentation exploits color information involved in all channels data and tries to optimize the global segmentation result by choosing the ＂best＂ channel for segmentation at each level. The experiments show that the method is effective in speed, accuracy and flexibility.     

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介绍了路况视频监控系统的现状和视频转码概况,提出了一种基于H.264的异构视频转码服务器设计方案,阐述了异构视频转码的机理,给出了转码服务器的构成,包括任务调度、转码等模块具体实现,就视频数据进程间通信和网络传输中的数据处理等关键技术进行了分析。采用级联象素域转码结构,使用多线程调度管理、共享内存、环形缓冲等技术实现了该转码系统,并已成功应用于江苏省高速公路的数字视频监控系统中。     

Outage performance of amplify-and-forward multiple-input multiple-output relay networks with outdated channel state information and co-channel interference

In this paper, we investigate the outage performance of a dual-hop amplify-and-forward(AF) multipleinput multiple-output(MIMO) relay network, considering beamforming transmission with outdated channel state information(CSI) and an arbitrary number of co-channel interferers at both the relay and the destination. The exact closed-form expression for the outage probability is derived, and the asymptotic behavior of the outage probability is also presented to provide further insights into the system performance. Our results show that the system suffers a diversity gain loss caused by the outdated CSI, and the interference only degrade the coding gain of the system. Moreover, increasing antennas can achieve more performance gains, however, the gains decrease as the delay of the CSI increases.     

基于模态试验和有限元模态分析的转向盘怠速抖动改进

针对某车型怠速工况下转向盘抖动问题,对整车进行了怠速振动试验并对转向盘进行了模态试验,确认转向盘系统与仪表板横梁及横梁与车身连接处的连接刚度不足导致整个转向系统模态下降,从而引起了共振。针对该问题建立了转向系统有限元模型,并根据模态试验结果对模型进行了验证。在该模型基础上对上述连接刚度进行了优化,对优化方案进行试验验证的结果表明该方案有效。