As the expansion of the project scale , the development of the complexity of skills and technology , and the dramatic change of social economy environment , the risk increase obviously and the relationship between each kind of risk become more and more complex . this makes risk management crucial in a project management 随着建设项目规模的日趋扩大、技术工艺复杂性的提高以及项目所处社会经济环境的日益多变,各类风险明显增多且相互之间的关系错综复杂,风险管理已成为决定建设项目成功与否的关键因素。
The main work of the dissertation is as follows : 1 . as to the characteristic of aeronautic product project which is generally big and complex , niche genetic algorithms are introduced to solve resource optimization problem . meanwhile , an optimization module , which is suitable to aeronautic product project , is developed by inviting niche genetic algorithms 本文主要工作如下：针对航空产品项目规模大、计划复杂的特点，采用小生境遗传算法进行网络计划的资源优化，克服了简单遗传算法的早熟问题，在此基础上，建立起了适合航空产品项目的资源优化模型。
In order to meet the domestic and international violent chanllenge coming from the iron and steel market , keep continously the compete ablitly . after many - faceted grounds of argument , jinan iron and steel corp decide to invest 1 . 299 billion to build a new steel plant . this project has the following peculiarities : in a large scale , complicated technique , many departments involed , but it is restricted with expense and execution time 在当前国内外钢铁市场激烈竞争的形势下，为确保济钢持续的竞争能力，经过多方论证，济钢需投资12 . 99亿元新建一座的新炼钢厂。该项目规模大，技术复杂，参加单位多，又受时间和资金的严格限制，需要用现代管理的原理、方法和技术工具进行项目管理。
The government ' s leading investment has higher cost of entering market , which brings on too bigger scale and more overlapping of investment item ; the government ' s leading investment also has higher obstacle of withdrawing market , which induces the flexibleness of budget restriction and the aggravation of district protecting 政府主导型投资的进入成本更低，导致此类投资的项目规模更大，重复建设更加普遍；退出障碍更高，导致与之相关的预算软约束、地方保护问题严重。
