铁路客运服务水平综合评价指标体系的研究

铁路客运服务水平综合评价指标体系是基于“无缝运输”的理念，以实现全过程服务、高效率服务为目标，通过分析旅客运输的各个环节和外部环境，从运输产品、运输过程、联合运输、形象服务4个方面对影响铁路客运服务质量的因素进行研究，建立了铁路客运服务水平综合评价指标体系。在此基础上，利用灰色关联分析方法，结合实际调查数据进行了案例分析。     

对外资概算编制办法有关问题的探讨

从设计角度出发,对外资概算编制办法中的作用、阶段、原则、内容及标准等,作了多方面的论述和研讨,为改革与修订外资概算编制办法提供了许多建议.     

沥青抗剥落剂在寒冷地区路面施工中的使用效果

沥青抗剥落剂是一种新型外掺剂 ,使用这种外掺剂可以有效的提高沥青和沥青混凝土粗集料的粘附性 ,同时扩展了沥青混凝土石料范围 ,在不影响使用效果的同时 ,降低建设成本。     

水下分散自重构模块的硬件设计

水下分散自重构系统(USS)是一种链式的水下自重构机器人，目前仅包含一种自重构模块(USM—1)，由于水下环境的特殊性，该模块具有不同于陆地自重构机器人模块的特点，详细介绍USM—1的硬件设计，并通过试验检验了USM—1运动和自重构的能力。     

Numerical Investigation of the Dynamics for Low Tension Marine Cables

This paper presents a numerical investigation into the dynamics of marine cables which are extensively used in offshore industry. In this numerical study, the Euler-Bernoulli beam model is adopted to develop the governing equations of the cable. Bending stiffness is considered to cope with the low tension problem in local area of towing cable, and thus a more accurate solution with the consideration of the axial elongation can be given.The derived strongly-coupled and nonlinear governing equations are solved by a second-order accurate, implicit,and large time step stable central finite difference method. The quadratically convergent Newton-Raphson iteration method is applied to solving the discrete nonlinear algebraic equations. Then a towed array sonar system(TASS)problem is studied. The numerical solutions agree reasonably well with the experimental data and the simulated results of the references. The specified program of the present paper shows great robustness with high efficiency.     

A Two-Stage Feature Selection Method for Text Categorization by Using Category Correlation Degree and Latent Semantic Indexing

With the purpose of improving the accuracy of text categorization and reducing the dimension of the feature space,this paper proposes a two-stage feature selection method based on a novel category correlation degree(CCD)method and latent semantic indexing(LSI).In the first stage,a novel CCD method is proposed to select the most effective features for text classification,which is more effective than the traditional feature selection method.In the second stage,document representation requires a high dimensionality of the feature space and does not take into account the semantic relation between features,which leads to a poor categorization accuracy.So LSI method is proposed to solve these problems by using statistically derived conceptual indices to replace the individual terms which can discover the important correlative relationship between features and reduce the feature space dimension.Firstly,each feature in our algorithm is ranked depending on their importance of classification using CCD method.Secondly,we construct a new semantic space based on LSI method among features.The experimental results have proved that our method can reduce effectively the dimension of text vector and improve the performance of text categorization.     

模型参数不确定条件下的自主水下航行器（AUV）自适应编队控制研究

研究了自主水下航行器的编队控制问题,基于编队参考中心思想为每个AUV构造了期望参考轨迹。将每个AUV的系统误差分为自身跟踪误差和与邻居AUV的协同误差两部分,在此基础上,针对AUV模型参数不确定性,提出一种自适应分布式控制律,使得每个AUV沿着自身期望轨迹运动,并与相邻AUV保持同步,从而与编队参考中心保持期望的距离,达到编队控制的目的。文章基于Lyapunov稳定性原理从理论上证明了闭环系统的稳定性,仿真结果表明所提出的算法是有效的。     

“海马”号4500米级ROV系统研发历程

作为国家863计划重点项目"4500米级深海作业系统"的主要研究成果,"海马"号4500米级无人遥控潜水器(ROV)于2014年2~4月在南海成功完成了海试。"海马"号是我国自主研发的第一套大深度ROV系统,最大工作水深4500m,主要作业功能是进行海底探测、取样以及其他水下作业。"海马"号的研发和海试成功是我国海洋技术领域继"蛟龙"号后的又一个标志性成果。介绍了"海马"号ROV的立项背景、研究目标、系统组成、总体技术性能和功能及其研发历程和海试情况。     

军事通信资源竞争机制初探

资源竞争现象在各种通信网络中都有一定程度的存在.在分析多种资源竞争解决机制和军事领域特点的基础上,探讨资源竞争处理机制在军事通信中的应用,并进一步指出以后的主要研究方向.     

SMC中间审核常见问题探讨

就ISM规则要求的SMC中间审核的审核要求，现场审核发现的一些常见问题，做一简要的归纳介绍，旨在帮助船公司及船舶在SMC中间审核中对一些常见的问题有一个具体的了解，并能引起借鉴，及时纠正不足，提高安全管理意识，使公司及船舶的安全管理体系上一个新的台阶。