| 价值工程的核心理念就是在项目的全寿命周期内考察其投入产出比。要提高城市轨道交通投资收益，既要重视一次性投资控制，更要重视全寿命周期费用的控制。城市轨道交通工程的设备投资约占总投资的35%，如何从全寿命周期角度选择工程设备，请阅读来自轨道交通建设管理第一线的理论成果《基于全寿命周期费用的城市轨道交通工程设备选择》。
2010年世博会期间将有7000万来客光临上海。会展期间还恰逢“五一”、“十一”两个黄金周以及暑假客运高峰期。如何应对如此巨大的交通冲击，需要未雨绸缪。徐瑞华、江志彬、王志业的《举办世博会条件下的上海市轨道交通网络运输组织》对此提出了很好的建议。
低地板车辆是现代轻轨交通发展的一大趋势，是一种人性化的设计。《低地板轻轨交通系统》一文分析了低地板轻轨车辆的主要类型和关键技术，这对于轨道交通先进技术装备国产化很有参考价值。
新的《地铁设计规范》已经公布，并从2003年8月1日起开始实施。对于城市轨道交通其它制式也需要进一步加以规范。本期发表沈景炎的《城市轨道交通多种制式的特征与评价大纲》一文，对各种制式展开了运量和适应性研究，并提出了各类系统的评价指标。本文篇幅较长，特分两期刊登，本期刊登第一部分。
曹雪琴、朱金龙的论文《城市轨道交通桥梁车辆荷载动力系数测试与分析》，通过对国内外现有《桥规》与城市轨道交通桥梁试验数据的对比，发现城市轨道交通桥梁动力系数值较小，并在此基础上提出了建立城市轨道交通桥梁车辆竖向荷载动力系数的建议，可供制定规范的有关部门参考。
国庆期间，本刊网站已更新，扩大了容量，增加了栏目，欢迎广大读者浏览。网址：
www.umt-cn.com。
Editors'
remarks
The kernel concept to decide
the value of an engineering
is to inspect the ration of
investment and yield in a
project during the life-cycle
cost. The only way to ensure
the profit of UMT investment
is to give more attention
to both one-off investment
and life-cycle cost control.
In general, UMT investment
takes 35% of the total project
construction investment. To
have the know-how of selecting
equipment from the angle of
life-cycle cost, we recommend
“The life-cycle cost and selection
of UMT equipment” to our readers,
which is the latest research
achievement from the forefront
of urban rail transit management.
It is estimated that about
70 million tourists will come
to Shanghai during the Expo
2010, which spans two “Golden
Week”(May Day and National
Day) rushes and one summer
vocation peak of passenger
transit. We have to prepare
for the unprecedented traffic
pressure with a well. “The
transport organization of
Shanghai urban mass transit
system during the Expo 2010”
is a good article to discuss
this problem.A new trend
of modern LRT development
is the introduction of low-floor
vehicles, a very human-oriented
design. “Develop low-floor
LRT system in China” analyzes
the major types and key technology,
you may take it for a good
reference in rail transit
design and home-manufacturing
of advanced technical equipment.
The new “Subway Design Regulations”
has been promulgated and implemented
since August 1, 2003. Be on
an equal with subway, the
standards of UMT also need
futher normanization. “Characters
of UMT standards and the assessment
outline” is a detailed study
on the amount of traffic and
adaptability of various systems,
plus an assessment indexes
for each system. But the length
of this article is too long
for a comfortable reading,
we choose to publish the second
half in the next issue.
“Field test and analysis
of the impact factor of the
vehicle loading on bridge”
makes a comparison between
the existing bridge standards
and the tested data of UMT
bridges both at home and abroad,
thus finding the impact factor
on UMT bridge being less than
that on railway bridge. Based
on the research, the authors
suggest a vertical loading
power coefficient for the
design of UMT bridge, which
may be considered as a standard
in bridge design.
During National Day, we
renewed our web site with
a larger capacity and more
columns, hope you′ll like
it. Please visit 〖ZZ(F〗www.umt-cn.com〖ZZ)〗.
You are welcome!
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