基于预控管理的铁路工程项目成本影响因素探讨

从不同角度对工程项目成本影响因素进行分类。以铁路建设工程项目为例,从征地拆迁、施工企业成本预控、地方与静态验收新增工程等方面分析成本预控管理的影响因素。结合铁路征地拆迁相关政策,提出铁路工程建设涉及的征地拆迁工作、地方改扩建工程及运营维护所需工程的成本预控建议。     

Effect of speed limits in degradable transport networks

This paper studies how link-specific speed limits influence the performance of degradable transport networks, in which the capacity of each link is a degradable random variable. The distribution and cumulative distribution of link travel time have been presented with the effect of speed limits taken into account. The mean and variance of link and route travel time are formulated. Three link states have been classified, and their physical meanings have been discussed. The relationship between critical capacity, travel time and speed limit has been elaborated. We have proposed a Speed Limit- and Reliability-based User Equilibrium (SLRUE), adopting travel time budget as the principle of travelers’ route choice. A heuristic method employing the method of successive averages is developed to solve the SLRUE in degradable networks. Through numerical studies, we find that for some networks both the mean and standard deviation of the total travel time could be reduced simultaneously by imposing some speed limits. The speed limit design problem has been studied, and it is found that imposing speed limits cannot always reduce the total travel time budget of a network.     

OPC技术及其在工程船舶实时监控系统中的应用

本文简述了OPC技术的由来、特点、技术基础。以一工程船舶实时监控系统设计为例,详细介绍了利用VB开发OPC数据接口的步骤和关键技术。经实船运行验证,该系统运行稳定、可靠,具有一定的推广价值。     

Study on mean-standard deviation shortest path problem in stochastic and time-dependent networks: A stochastic dominance based approach

This paper studies a mean-standard deviation shortest path model, also called travel time budget (TTB) model. A route’s TTB is defined as this route’s mean travel time plus a travel time margin, which is the route travel time’s standard deviation multiplied with a factor. The TTB model violates the Bellman’s Principle of Optimality (BPO), making it difficult to solve it in any large stochastic and time-dependent network. Moreover, it is found that if path travel time distributions are skewed, the conventional TTB model cannot reflect travelers’ heterogeneous risk-taking behavior in route choice. This paper proposes to use the upper or lower semi-standard deviation to replace the standard deviation in the conventional TTB model (the new models are called derived TTB models), because these derived TTB models can well capture such heterogeneous risk-taking behavior when the path travel time distributions are skewed. More importantly, this paper shows that the optimal solutions of these two derived TTB models must be non-dominated paths under some specific stochastic dominance (SD) rules. These finding opens the door to solve these derived TTB models efficiently in large stochastic and time-dependent networks. Numerical examples are presented to illustrate these findings.     

Water resources development in Turkey

The Southeastern Anatolia Projec(tGAP),one of the most important projects for developing remarkable natural resources of the world,is accepted as a change for getting benefit from rich water and agricultural resources of the Southeastern Anatolia Region.The GAP Project has been considered as a regional development projects through years,but the dimensions of sustainability,protection of environment and participatory have been attached to the master of the project in recent years.When the GAP Project is completed,the Upper Mesopotomia, the centers of many civilisation,will re-again its importance as it had in the ancient times,and will be alive a center of civilisation.Moreover,when the problem of water shortage and water supplies in the world for the future is kept in mind,the importance of Southeastern Anatolia′s water supplies will be doubled.For this reason,the GAP Project,developed by depending on water and natural resources of the region,will have an important place in the world.The aim of this study is to introduce the region with rich natural resources and the GAP Project.For this reason,firstly,the natural potential of the region will be introduced.Second,the GAP Project will be presented in details.In the third stage,the projects being processed for protecting the natural sources and environment will be analyzed.In the last stage,strategies and policies to develop and to protect the natural resources of the region in short,mid,and long terms will be proposed.     

新编《铁路信号工程预算定额》概况及分析

对新编《铁路信号工程预算定额》从结构编排、定额内容、施工工艺、费用及其他5个方面做了详细介绍，同时提出使用中应注意定额子目的应用要与工程实际相符、工程量不能重复计列、要掌握设备价的内涵等3个方面问题。此文旨在给读者正确理解和使用“新定额”提供帮助。     

谈通信工程造价的预结算审核

本文介绍了工程造价的预结算审核的内容和主要的审核方法。     

浅议水利工程施工管理

根据水利施工管理的特点,对水利工程施工管理工作进行分析和探讨,重点对管理特征、管理内容进行分析,并提出了水利工程施工管理工作应注意的事项。     

三峡工程设计中的重大技术问题

三峡工程为举世瞩目的水利工程,其工程规模之浩大、技术问题之复杂都是罕见的。该文选择了工程设计中坝址的选定及枢纽建筑物设计中的若干关键技术问题进行介绍和阐述,以期读者对三峡工程有更深入的了解。     

工程承包价款谈判

工程承包价款谈判策略包括降价策略、调和折衷策略、对等让步策略、“吊胃口”策略、削弱对方信心策略和“最后一分钟”策略等。