互联网省干工程的研究与实施

用户数快速的增长,互联网占用带宽迅速上升,已不能满足业务需求。分析研究铁通分公司省干互联网的改造方案,就重新调整省内互联网出口路由,规范省网出口设置和路由策略,优化互联网业务流量和流向等提出建议。     

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.     

高真空击密法在京唐港3 000万t煤炭泊位工程吹填土软基处理中的应用

详细介绍了高真空击密法的原理及施工控制要点。通过工程实例,以浅层平板载荷及重型动力触探检测结果和沉降观测数据为依据,证明高真空击密处理软土地基有工期短、效果好等优点,在一定意义上将强夯法推广应用到了饱和软粘土。     

重大突发公共卫生事件下城市应急医疗物资优化调度研究

针对新型冠状病毒肺炎（新冠肺炎）疫情防控中应急医疗物资调度不尽合理、集配中心中转效率不够高等问题，重新设计了重大突发公共卫生事件下城市应急医疗物资调度与配送体系，并给出了应急医疗物资的分类方法。从医疗物资使用需求和库存估计可使用时间2个维度构建需求点紧急度指标，考虑突发公共卫生事件特征，以加权的需求满足率最大化为主要目标、车辆行驶距离最小化为次要目标，构建应急医疗物资动态分配模型，并通过算例验证了模型的有效性和可行性。结果表明：所构建的模型能够兼顾医疗物资分配的公平和效率，符合突发公共卫生事件中应急医疗物资供给和需求的动态变化特性，确保在物资短时间供给不足的情况下各需求点也能公平获取一定比例的物资；且模型仅要求各需求点上报各种品类医疗物资的使用人数和库存量，同时模型还给出数据缺失时的自动计算办法，可操作性更强；运用紧急度指标对需求满足率最大化目标进行校正，解决了各需求点因需求量差异对公平分配造成的影响，使得应急医疗物资分配更加合理。研究成果结合了新冠肺炎疫情防控中应急医疗物资调度的具体过程，使得分配模型更符合实际需要，可为城市应急医疗物资优化调度提供决策依据。     

“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。     

地铁转向架构架动应力测试滤波频率的确定

文章结合上海地铁某转向架线路试验动应力测试结果,分析了典型信号的频率特性,对转向架动应力数据采用不同频率滤波,对滤波后的信号数据进行了比较,并结合采样定理提出了适用于地铁转向架荷载测试的滤波和采样频率。     

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。