桥梁管理系统中的桥梁退化模型实现

分别运用马尔可夫链和半马尔可夫过程为桥梁管理系统建立桥梁退化模型,并提出程序流程。通过退化模型可以对桥梁状态进行预测,其预测结果直接为桥梁管理工作人员提供决策辅助,也可以作为桥梁决策优化的基础,而当桥梁状态数据不充分时,桥梁状态预测过程可以为桥梁管理系统采集数据提供必要的指导。     

A new methodology for incident detection and characterization on surface streets

In this paper, a new methodology is presented for real-time detection and characterization of incidents on surface streets. The proposed automatic incident detection approach is capable of detecting incidents promptly as well as characterizing incidents in terms of time-varying lane-changing fractions and queue lengths in blocked lanes, lanes blocked due to incidents, and incident duration. The architecture of the proposed incident detection approach consists of three sequential procedures: (1) Symptom Identification for identification of incident symptoms, (2) Signal Processing for real-time prediction of incident-related lane traffic characteristics and (3) Pattern Recognition for incident recognition. Lane traffic counts and occupancy are the only two major types of input data, which can be readily collected from point detectors. The primary techniques utilized in this paper include: (1) a discrete-time, nonlinear, stochastic system with boundary constraints to predict real-time lane-changing fractions and queue lengths and (2) a pattern-recognition-based algorithm employing modified sequential probability ratio tests (MSPRT) to detect incidents. Off-line tests based on simulated as well as video-based real data were conducted to assess the performance of the proposed algorithm. The test results have indicated the feasibility of achieving real-time incident detection using the proposed methodology.     

Toward regional transportation governance: a case study of Greater Vancouver

This paper discusses the evolving institutional structure and governance of transportation planning, policy development and transit delivery within one major North American city-region, the Greater Vancouver area. Various methods of transportation governance are explored from complete independence to full regional integration. The move away from a direct provincial role in transportation management to a greater regional transit authority is discussed and critiqued. This revised version was published online in June 2006 with corrections to the Cover Date.     

“建设精品工程、美化都市生活”创建职工最满意企业

该文通过建设项目管理单位企业文化建设实例,对创建满意企业、和谐企业进行探索,总结出若干项工作经验。其经验对提升和改善企业文化建设,进而促进企业持续发展有着积极意义,可供同行借鉴。     

大型耙吸挖泥船“新海虎”号的轮机设计

文章描述了“新海虎”耙吸挖泥船轮机系统的设计，包括采用复合驱动的动力系统、功率管理系统、热源系统、冷却系统和泥泵封水系统的设计。     

论新形势下大型国有施工企业的安全管理

近年来,中国的经济增长和结构调整,及加速城市化进程等方面的需求,极大地增加了对于基础设施服务的市场需求和投资需求,国家基建投资大幅上扬,建筑企业的安全生产管理工作压力突显。该文结合当前建设市场形势下建筑施工企业尤其是国有施工企业中出现的安全管理问题,提出了一些对策性研究,以便和同行交流。     

探讨道桥施工以及养护管理

对当今道桥的施工以及养护管理存在的问题进行了详细的分析，提出道桥施工质量控制要点，构建桥梁养护质量体系。     

船舶修理设计管理概述

文章介绍了现阶段修船企业在设计管理方面的流程和经验，总结并提出设计在船舶修理中具有重要的地位及发展趋势。就修船企业而言，如何充分利用工厂自身条件，合理设计出切实可行、节约成本、为公司提高经济效益的船舶修理产品，有特别的实际意义。     

公路工程项目风险管理的探索

公路工程项目是在复杂的自然和社会环境中开展的。是一个建设周期长、投资多、技术要求高、内部结构复杂、外部联系广泛的建设施工过程。公路工程项目作为集经济、技术、管理和组织为一体的综合性活动，在各个方面都存在着不确定性。因此迫切需要加强风险管理。     

浅谈目标管理在汽运企业的应用

从制定科学的目标管理体系、建立完整的目标控制系统、采取有效的保证措施等几个方面阐述了目标管理方法在汽运企业的应用。