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Both LDPC codes and OFDM technology are studied in this paper. The working and the results obtained are summarized as follow:1. The definition of LDPC codes and its coding/decoding ideas are systematically summarized, a general algorithm of changing any parity-check matrix to lower triangular form, which is suitable for quick encoding, is given out, along with a girth checking algorithm. Absolutely random LDPC codes construction is improved, a new half random construction of LDPC codes with linear time coding and no 4-cycles is brought out.

系统地阐述了低密度校验码的定义及编译码原理，提出了一种将任何校验矩阵变换成适于快速编码的近似下三角形式的通用算法及一种围长检测算法，对完全随机的校验矩阵构造法进行了改进，提出了一类消除4环且可近似线性编码的校验矩阵半随机构造法，仿真表明，在高编码效率情况下，改进后的半随机构造法，其性能稍优于完全随机构造法，并可以线性时间编码，因此更适合实际应用。

Combined with engineering instance,this paper analyzes the causes of the problems probably existed in paving road bed soil, grey soil and lime-fly ash macadam and in pavement construction,and proposes treatment measures in light of different problems,in order to ensure construction quality of road.

结合工程实例，对路床土、灰土、二灰碎石的铺设及路面施工中可能存在问题的原因进行了分析，并针对不同的问题提出针对性的处理措施，以保证道路的施工质量。

Is one of the Housing Construction general contracting two major qualities of the provincial construction enterprises.

湖北城乡建设有限公司是一家具有房屋建筑工程施工总承包二级资质的省属大型建筑企业。

Urban community Party construction is a major topic for Party construction in the new century.

城市社区党的建设是新世纪党的建设面临的重大课题之一。

Using the construction method of plain brings about the maladjustment of machine deploying and elevation of construction cost.

如果在高原地区施工仍然采用平原地区的机群配置，必然导致整个施工机群配置的失调，施工成本的提高。

With the rapid development of science technology , the social environment changes at very fast speed. Uncertain factors and risks of construction engineering project are manifolding increasingly, in addition ,the risk management of construction engineering project has not method system for reference. During the process of project management ,most of people deal with things by right of their experiences. The scale of expense lead by risks is larger and larger.

随着科技的飞速发展和人们生活节奏的不断加快，社会环境瞬息万变，各建筑工程项目所涉及的不确定因素日益增多，面临的风险越来越多，再有我国的建筑工程项目风险管理没有一套完整的可供参考的方法体系，在建筑工程项目的管理过程中，大多数是凭自己的经验办事，风险所致损失规模也越来越大。

As a construction enterprise involving general contracting of middle-and large-sized construction projects, Hengsheng Group has completed a number of large projects such as Shanghai Yuandong Recreation Plaza,Shanghai Haoshijia Building Material and Gardening Market, Beijing Finance Street International Center, Wenzhou guoxi Mansion, Wenzhou Power Plant,Anhui Wuhu Century Homesteal, China Weixing Stock Industrial park, China Linya Group Industrial park and so on.

作为大中型建筑总承包施工企业，恒盛集团承建了诸多知名的大型建设项目，如上海远东娱乐广场、上海好饰家建材园艺市场、北京金融街国际中心、温州国信大厦、温州电厂、安徽芜湖世纪家园、中国伟星肌份工业园、中国临亚集团工业园等多项大型工程。

Tunnel project started from the end of July 2009, has been the company's leaders are most concerned about one of the items. No. 1 tunnel construction more smoothly, was run through January 13 of this year. No. 2 tunnel construction process, there are many uncertain and unpredictable factors, imports of concrete lining of 228 meters, the rock formation is marl, landslides serious digging edge to edge supporting, progress is slow.

隧道工程自2009年7月底开工以来，一直是公司领导最关心的项目之一。1号隧道施工比较顺利，已于今年1月13日贯通。2号隧道施工过程中，存在很多不确定和不可预见因素，进口砼衬砌228米，岩层是泥灰岩，塌方严重，采取边挖边支护，进展缓慢。

The construction of mass media in countryside itself is part of the construction of a new socialist countryside.

农村的大众传播媒介建设本身也是新农村建设的组成部分。

Second, mass movement in economic construction repelled the construction style of "using capitalism to build socialism"

二、经济建设上的群众运动排斥了"利用资本主义"的建设思路

The United Kingdom has pledged to provide technical assistance to the peacekeeping effort in Darfur, including airlifting supplies and equipment to assist the African peacekeepers.

英国承诺为达佛的維和努力提供技术帮助，包括提供非洲的維和部队空运补給和裝备。

Results: The level of ET-1mRNA in placental villus was significantly higher in pre-eclamptic women than that in control group.

结果：妊高征组患者胎盘绒毛组织ET-1 mRNA的表达较正常妊娠组明显增高。