交通7+1论坛第十次会议在京召开

<正>2008年3月29日,"交通7+1论坛"第十次会议在北京国宏大厦召开。出席会议的有国家发展和改革委员会交通运输司司长王庆云、北京市政协副主席赵文芝、中国工程院院士邹德慈等有关部门领导、专家和学者。     

长大公路隧道网络通风研究

文章讨论了长大公路隧道通风网络的理论,建立了通风网络的数值模型,在此基础上编制了公路隧道网络通风解算程序,通过对秦岭终南山公路隧道通风方案的分析和研究,验证了程序的适用性和正确性,为解决长大公路隧道运营通风问题提供了一种有效途径.     

城市轨道交通网络中的整体视频监控模型研究

随着国内城市轨道交通步入网络化建设发展阶段,网络化视频技术也得到了广泛地应用。基于上海的现状提出适应轨道交通网络特征下的系统模型,介绍了视频监控网络模型研究,为网络化视频工程的设计、建设和应用提供借鉴思路。     

A new channel allocation scheme for hierarchical wireless networks

A channel allocation scheme for hierarchical wireless networks was proposed in terms of the connection-level quality of service. The channel allocation scheme was analyzed using both horizontal channel borrowing and vertical traffic overflowing. Pre-emptive priority strategies are used to classify real-time services and non-real-time services, real-time service is given higher priority for it is allowed to pre-empt channels used by non-real-time service. Some channel borrowing thresholds and acceptance ratios are used to avoid channel locking or dynamic power control, which can also be dynamically adjusted according to network load. Simula-tion results show that the proposed schemes can improve the system performance.     

Energy-aware load-balaning fault-tolerant routing scheme for ad hoc sensor networks

Most routing protocols for sensor networks try to extend network lifetime by minimizing the energy consumption, but have not taken the network reliability into account. An energy-aware, load-balancing and fault-tolerant routing scheme, termed as ELFR was propsed to adapt to the harsh environment. First a network robustness model was presented. Based on this model, the route discovery phase was designed to make the sensors to construct into a hop-leveled network which is mesh structure. A cross-layer design was adopted to measure the transmission delay so as to detect the failed nodes. The routing scheme works with acknowledge （ACK） feedback mechanism to transfer control messages to avoid producing extra control overhead messages. When nodes fail, the new healthy paths will be selected locally without rerouting. Simulation results show that our scheme is much robust, and it achieves better energy efficiency, load balancing and maintains good end-to-end delay.     

柳汽霸龙507诠释欧洲经典——访东风柳州汽车有限公司总经理程道然

一直以来,“缺重少轻”是对我国卡车行业最形象的描述。虽然经过近几十年的发展．也有一些大吨位的汽车不断出产,但缺少真正意义上的重卡一直是我国汽车产业的软肋。直到2005年开始．随着中国高速公路网络的臼益完善和物流企业减低成本等原因,一些大马力、环保型、效益型重卡新品在市场上崭露头角。     

新时期高校网络党建的实践与思考

网络党建具有时代发展的必要性和重要性。本文阐述了新时期高校开展网络党建的必要性、网络党建设的原则,提出了高校网络党建的实施途径。     

欧铁通票北欧四国游客铁路旅行优惠

北欧斯堪的纳维亚半岛的铁路通票,日前正式加入欧洲铁路集团巨大的铁路网络中。今后,游客在世界各地购买著名的“欧铁通票”,将可以囊括北欧四国：丹麦、芬兰、挪威和瑞典,并享受这四国铁路旅行的优惠票价。     

现代物流企业网络组织结构探析

在分析我国传统物流企业组织结构模式的基础上,探讨了网络组织理论在现代物流企业中的应用,并给出了传统物流企业组织结构向网络组织结构过渡的策略。     

循环物流的运作模式与技术手段

早在1966年,美国经济学家波尔丁就已经提出了"循环经济"这一概念.循环经济是一种对现有资源进行精细、清洁、循环利用的经济发展模式,以"资源-产品-再生资源"的物质反复循环流动的形式来达到人类可持续发展的目的.