船舶焊接技术专业“一体化”教学模式研究与实践

船舶建造的关键技术之一是船舶的焊接技术。我国船舶工业的快速发展对高职院校加快培养大批高素质技能型船舶焊接技术专门人才提出了新的更高的要求,传统的教学观念和模式已经难以适应现代职业技术教育的发展,因此需要进行教学体制的改革,建立起适应专业特点和课程特点的"一体化"教学模式,以满足船舶工业对船舶焊接技术专业高技能人才的需求。     

构建“理实一体化”教学模式的研究与实践——以高职汽车运用技术专业为例

文中结合广东交通职业技术学院汽车运用技术专业开展一体化教学改革的探讨和实践,重点阐述以现代教育理念为指导,进行教学改革的必要性。具体介绍了汽车专业一体化教学的特点,一体化教学模块课程的开发方法和课程结构,一体化教学课程组织实施方法和评价。为其他专业开展教学改革提供了有益的参考。     

公共交通与城市用地整合分析——以常州市为例

根据现有国内外城市发展经验,归纳总结公共交通与城市用地整合的常见模式,并结合常州市快速公交与城市用地整合所采取的模式进行详细叙述与评价,可为国内其他城市的公交与用地整合发展提供参考。     

长沙市核心区交通综合问题分析与改善方案

首先对长沙市核心区的交通问题进行宏观与微观的深入剖析;然后从精细化交通设计、越江接线交通组织、接入管理控制、信号控制及停车系统优化等层面提出综合改善方案;并以长沙市核心区综合改造工程为例进行验证。结果表明,交通改善需利用系统优化原理,从微观与宏观结合角度进行综合整治。     

公交整合与枢纽站规划设计要点

公交方式之间相对独立发展不利于资源节省和乘客快捷换乘。首先对公交系统整合的特点及优势进行了分析。公交枢纽站作为公交系统整合的重点,其规划和设计已经成为制约或促进公共交通系统快捷、高效运行的重要因素之一。为此,提出公交枢纽站规划应坚持公交整合、车站上盖物业和人车分流的原则,并针对公共汽车、出租汽车、乘客和公交枢纽站对道路交通流的影响提出相应的规划目标。最后,从布局设计、环境、乘客及运营设施、乘客信息等方面提出公交枢纽站的设计原则,并以公交枢纽站中公共汽车首末站设计为例,通过图示的形式给出设计案例。     

公共交通系统整合与服务优化

对城市公共交通服务进行系统整合是公共交通规划的一个重点。从国际经验来看,公共交通系统整合包含两个层面：在公交线网层面上对所有公交模式与线路的整合;在给定的公交方式内部（如地铁或公共汽车）或给定的线路内进行整合。做好这两个层面的整合,可以为乘客提供更舒适的乘车体验,同时提高公共交通的运营效率,最终能够增加公共交通使用者的数量并提高使用者的满意程度。每个层面的整合都包括一些基本的规划设计元素,公共交通规划必须对这些元素的规划设计进行协调和配合,从而实现整个线路和线网的整合与优化。     

基于SOA的开放式车务综合信息平台架构研究

面向服务架构(SOA)具有松耦合、平台和开发语言独立、粗粒度服务接口等优点,能够方便、快捷地对企业内部信息系统进行功能整合.本文首先介绍SOA的概念及实现技术,然后结合成都铁路局绵阳车务段综合信息平台项目给出一个基于SOA的开放式车务信息系统集成基础框架的实例.     

铁路电子政务发展及在基层推广应用策略

经过多年的发展,电子政务已在铁路部门得到推广和应用.电子政务在铁路基层单位的应用和推广可能会遇到组织管理、资源整合和资源共享等问题.文章结合电子政务发展所遇到的普遍问题,提出电子政务在基层的推广应用策略.     

Gap Acceptance Capacity Model for On-Ramp Junction of Urban Freeway

The commonly-used capacity calculation approaches for ramp junctions are mostly based on the American Highway Capacity Manual method. It had been approved that the headways for vehicles following the Weibull distribution function at on-ramp junctions in urban freeway system. The paper examined the critical headway and following time by the modified drew method and the survey traffic flow data on-site. The gap-acceptance capacity calculating model was developed for on-ramp junctions of urban freeway, and the numerical integration method was used to solve the model. Finally, the capacity values were obtained in condition of different mainline design speeds and different acceleration lane lengths. The results indicated that the capacity value would grow with the increase of the acceleration length and mainline design speed, and the capacity values for on-ramp junctions would approach basic freeway segments capacity values while the acceleration lengths beyond 400 meters.     

Switching between antenna subset selection and quasi-orthogonal space-time block code in presence of correlation

We address the problem of adaptive modulation and coding scheme (AMCS) for a multi-input multioutput (MIMO) system in presence of time-varying transmitting correlation. Antenna subset selection and quasiorthogonal space-time block code (QOSTBC) have different error performances with different signal-to-noise ratios (SNRs) and in different spatial correlation scenarios. The error performance can be improved by selecting an appropriate transmission scheme to adapt to various channel conditions. The maximum distance criterion is the simplest and very effective algorithm for the antenna subset selection without needs of complex calculation and channel state information at transmitter (CSIT). The minimum error performance criteria and the simplified linear decision strategy are developed for constant transmission rate traffic to select the optimal transmission scheme. It can dramatically decrease algorithm complexity for obtaining error probability according to the known quantities comparing with using instant CSIT. Simulation results show that, remarkable performances including low SNR and weak spatial correlation at the expense of simple calculation and almost no bandwidth loss by adopting AMCS can be achieved. The proposed AMCS improves robustness of slowly varying spatial correlated channels.