产业集聚形成原因探析

产业集聚是当今世界经济中颇具特色的经济组织形式，特别集中在高新技术产业领域。集聚区内的企业通过合作与交流可以发挥规模经济效应，同时可产生强大的溢出效应。集聚区的形式多种多样，产生原因由以资源禀斌为主日益转变为以高等生产要素特别是创新体系为主。以高新技术产业为代表的集聚区将会成为区域经济和世界经济发展的重要力量。     

钢丝网水泥薄壳闸门耐久性及强度的调查研究

对阜阳7座钢丝网水泥薄壳闸门的耐久性及强度进行了调查和统计分析。运行表明,闸门的耐久性及强度均良好。而施工工艺是钢丝网水泥耐久性的关键。     

GPS测量技术研究

针对GPS测量实际工作中 ,影响GPS测量的成果质量和工效的因素进行了分析研究 ,并提出了解决的办法。对完善GPS测量的技术和方法 ,具有一定的指导意义。     

A hybrid approach based on stochastic competitive Hopfield neural network and efficient genetic algorithm for frequency assignment problem

This paper presents a hybrid efficient genetic algorithm (EGA) for the stochastic competitive Hopfield (SCH) neural network, which is named SCH–EGA. This approach aims to tackle the frequency assignment problem (FAP). The objective of the FAP in satellite communication system is to minimize the co-channel interference between satellite communication systems by rearranging the frequency assignment so that they can accommodate increasing demands. Our hybrid algorithm involves a stochastic competitive Hopfield neural network (SCHNN) which manages the problem constraints, when a genetic algorithm searches for high quality solutions with the minimum possible cost. Our hybrid algorithm, reflecting a special type of algorithm hybrid thought, owns good adaptability which cannot only deal with the FAP, but also cope with other problems including the clustering, classification, and the maximum clique problem, etc. In this paper, we first propose five optimal strategies to build an efficient genetic algorithm. Then we explore three hybridizations between SCHNN and EGA to discover the best hybrid algorithm. We believe that the comparison can also be helpful for hybridizations between neural networks and other evolutionary algorithms such as the particle swarm optimization algorithm, the artificial bee colony algorithm, etc. In the experiments, our hybrid algorithm obtains better or comparable performance than other algorithms on 5 benchmark problems and 12 large problems randomly generated. Finally, we show that our hybrid algorithm can obtain good results with a small size population.     

莱钢集团全面风险管理信息系统的设计与实现

莱钢集团全面风险管理信息系统实现了风险收集、风险归档、风险事件库、风险评估、风险图谱、风险文化管理和系统管理功能.实现全员、全面、全方位、全过程的风险管理,使公司生产经营管理风险得到有效控制.     

低渗透油藏有效厚度下限标准研究

低渗透油藏储层物性较差,通常油层在酸化压裂等工艺技术措施下,才可产出工业油流,对低渗透油藏有效储层进行测井解释较为困难。从冷家堡油田冷46区块的油藏特征出发,建立了一套有效厚度下限标准研究方法。为检测油层有效厚度划分精度,在取心井中选取5口井进行岩心厚度与测井厚度对比,层划准率达100%。并据此标准划分39口单井有效厚度,有效地保证油层射孔,为注水开发提供可靠的依据。     

Real speed of data transfer and the signal-to-noise ratio in a wireless net for connection with mobile objects

The paper presents experimental results of evaluation of the data transfer speed between a mobile object and base stations of a wireless 802.11.g standard network. Estimates are produced for different velocities of object motion. At the same time, measurement was carried out on the signal-to-noise ratio in a channel. A functional relation has been established between the real data transfer speed and the signal-to-noise ratio in the channel of the wireless net connected to a mobile object.     

面向非计划维修停机时间分析的装备维修过程有色Petri网模型

在总结装备非计划维修过程特点的基础上，进行了非计划停机时间组成及影响因素分析。采用有色Petri网建立了多类任务并行维修的过程模型，实现了维修资源动态组合和服务台数量动态变化的形式化建模。结合维修任务生成模型，实现了装备非计划维修停机时间分析功能，最后进行了实例研究。     

实用数据挖掘系统

主要介绍数据挖掘技术在宝钢配矿系统和热轧质量控制系统中的应用，并由此提炼出一般质量优化所具有的普遍特征，希望能通过这个系统为质量设计人员提供一个支持平台。