图形驱动式路线施工放样与控制系统的研究与实现

为提高路线施工测量计算的计算机应用水平,提出图形驱动式路线施工测量计算方法,并以自主研制的FunGra系统为图形环境,通过建立基于功能图形对象的路线施工测量计算对象模型,以及在系统中提供创建和操作这些功能图形对象的便捷机制,实现了一个图形驱动式路线施工测量计算系统。现场应用验证了该系统的可行性和高效率。     

Transit assignment under crowded conditions

This paper presents a transit assignment algorithm for crowded networks. Both congestion in vehicles and queuing at stations are explicitly taken into account in predicting passenger flows for a fixed pattern of origin-destination trip demands. The overflow effects due to insufficient capacity of transit lines are considered to be concentrated at transit stations, while the in-vehicle congestion effects (or discomforts) are considered to be dependent on in-vehicle passenger volume. Overflow delay at a transit station is dependent on the number of excess passengers required to wait for the next transit car. We use a logit model to determine the split between passengers that chose to wait for the next transit car and passengers that chose to board on the alternative transit lines. The proposed algorithm predicts how passenger will choose their optimal routes under both queuing and crowded conditions.     

中国可在东盟自由贸易区谋求多赢

2002年5月,中国与东盟双方正式启动在10年内建成中国-东盟自由贸易区的谈判.中国外交部副部长说,中国-东盟自由贸易区将使双方的出口增长50%,而且东盟国家的经济增长提高1个百分点,中国的经济增长也将提高0.3个百分点.<亚洲华尔街日报>报道,亚洲国家出口出现一年多来的首次同比增长,并非受益于美国经济复苏,而是因为中国市场需求的提升.今年4月,新加坡对美国和欧盟国家的出口同比增长不到2%.     

基于Multigen Creator和Vega的"数字校园"演示系统开发

为了展示武汉大学美丽的校园风貌 ,充分利用我校新近引进的虚拟现实系统 ,开发了一个“数字校园”演示系统 ,实现了虚拟现实表现的基本功能。介绍了该演示系统的有关技术细节 ,包括系统构成、数据处理流程和应用软件的二次开发技术等     

造船企业生产物流的组织

介绍了造船企业生产物流的概念，分析了造船企业生产物流的特征，提出了合理组织造船企业生产物流的基本原则。从空间、时间以及人员三方面阐述了现代造船模式下的造船企业生产物流系统的组织形式。     

The Nigerian shipping industry and indigenous shipping companies

The shipping industry in Nigeria since the early 1990s has been experiencing a continuous disastrous downturn. Nigerian shipping companies' participation in international shipping has continued to be very limited. Their presence and impact is hardly felt in the world's shipping industry. Both the national carriers (that is shipping companies with national carrier status) and other indigenous private shipping companies have vessel as well as management problems. These problems have led to the poor performance of the Nigerian shipping industry for over a decade now. The carriers in the industry are not attaining for the country the gains that are supposed to emanate from shipping. This paper points out the importance of shipping to a nation, identifies the problems the country's shipping companies are facing and proffers solutions that include merging of the companies to have strong financial standing and a competitive edge.     

大秦线运煤敞车车体情况调查及分析

针对我国铁路运煤敞车现状,以大秦线在用各种类型运煤敞车为试点,开展运煤敞车车体情况调查及分析,重点调查分析了铝合金、耐候钢和铁素体不锈钢材料车体的腐蚀、磨损情况,保护涂料现状,异种材料焊接部位的裂纹、腐蚀情况,材料的疲劳寿命和表面涂装问题,得出分析结论:目前使用的耐候钢材料其耐腐蚀性能不能满足车辆设计寿命的要求,铁素体不锈钢在耐腐蚀性能上明显优于耐候钢。建议对TCS不锈钢材料进行运用条件下的大气暴晒试验,C70B车体外表面油漆使用新的长效防护涂装体系,对有裂纹的车辆进行解剖、研究,以确定裂纹产生的原因、扩展方式和速度。     

关于天文航海教学的探讨

天文航海是航海专业课程中的难点，学生很难把握和学好，文章从教学的角度分析了如何展开天文航海教学提高教学效果，增强学生天文综合应用能力。     

Simulation studies of information propagation in a self-organizing distributed traffic information system

This paper investigates the feasibility of a self-organizing, completely distributed traffic information system based upon vehicle-to-vehicle communication technologies. Unlike centralized traffic information systems, the proposed system does not need public infrastructure investment as a prerequisite for implementation. Due to the complexity of the proposed system, simulation is selected as the primary approach in the feasibility studies. A simulation framework is built based on an existing microscopic traffic simulation model for the simulation studies. The critical questions for building the proposed market-driven system are examined both from communication requirements and traffic engineering points of view. Traffic information propagation both in freeway and arterial networks via information exchange among IVC-equipped vehicles is tested within the simulation framework. Results on the probability of successful IVC and traffic information propagation distance obtained from the simulation studies are generated and analyzed under incident-free and incident conditions for various roadway formats and parameter combinations. Comparisons between the speed of the incident information wave and the speed of the corresponding traffic shock wave due to the incident are analyzed for different scenarios as the most crucial aspect of the information propagation as a potential foundation for application in such a decentralized traffic information system.     

努力开创港口轨道衡管理工作新局面

港口计量工作随着港口运输生产的不断发展，其重要性也越来越受到各级管理者的高度重视与关注。秦皇岛港务集团铁运分公司经过多年的严格管理、扎实工作，逐步摸索出了一条科学的管理方法，在加强计量管理，提高服务质量，提升企业形象等方面做了有益的尝试。