四维法分析提升LTE驻留比

当前LTE网络连续覆盖不足,深度覆盖有限,用户驻留4G网络的情况不尽如人意。本文从维护、优化、市场、规划四个维度入手,形成系统的分析体系,对驻留比提升有一定的指导意义和参考价值。     

某型无人靶机飞行航路规划设计及领航

通过对某型无人靶机的飞行特性进行分析，研究靶机自主导航设计原理，对该型靶机的飞行航路和自主导航装订航线进行规划设计；结合多次供靶实际，研究分析该型靶机空中易出现的特殊情况，并提出可行的处置措施。     

智能车辆最短路径算法的研究与实现

最短路径算法是智能车辆路径规划问题的核心内容。从道路网络拓扑结构的自动构建以及Dijkstra算法中快速搜索技术的实现入手,综合考虑核心算法和数据存储结构两个方面,提出了直线优化Dijkstra算法。该算法能够有效降低时间复杂性,提高系统的效率。     

WCDMA与GSM无线网络规划比较

首先介绍了WCDMA和GSM系统不同的技术特点并进行了比较,在此基础上,结合无线网络规划的一般流程,对这两种系统在无线网络规划方面进行了分析比较,研究了他们之间的异同。通过这种分析和比较,借鉴GSM网络比较成熟的网络规划技术和经验,对于即将开始进行的第三代移动通信网络规划具有一定的参考价值。     

Periodic maintenance and repair rate control in stochastic manufacturing systems

In this paper, we consider a periodic preventive maintenance, repair, and production model of a flexible manufacturing system with failure-prone machines, where the control variables are the repair rate and production rate. We use periodic preventive maintenance to reduce the machine failure rates and improve the productivity of the system. One of the distinct features of the model is that the repair rate is adjustable. Our objective is to choose a control process that minimizes the total cost of inventory/shortage, production, repair, and maintenance. Under suitable conditions, we show that the value function is locally Lipschitz and satisfies an Hamilton-Jacobi-Bellman equation. A sufficient condition for optimal control is obtained. Since analytic solutions are rarely available, we design an algorithm to approximate the optimal control problem. To demonstrate the performance of the numerical method, an example is presented.Research of this author was supported by the Natural Sciences and Engineering Research Council of Canada, Grant OGP0036444.Research of this author was supported in part by the University of Georgia.Research of this author was supported in part by the National Science Foundation, Grant DMS-92-24372.     

A dynamic production planning and scheduling algorithm for two products processed on one line

This paper presents a dynamic production planning and scheduling algorithm for two products processed on one line over a fixed time horizon. Production rates are assumed fixed, and restrictions are placed or inventory levels and production run lengths. The resulting problem is a nonlinear binary program, which is solved using an implicit enumeration strategy. The algorithm focuses on the run changeover period while developing tighter bounds on the length of the upcoming run to improve computational efficiency. About 99% pf 297 randomly generated problems with varying demand patterns are solved in less than 15 seconds of CPU time on a CDC Cyber 172 Computer. A mixed integer programming formulation of the generalized multi-product case under no-backlogging of demand is also given.     

A Crop Planning Problem with Fuzzy Random Profit Coefficients

The main purpose of this paper is to present a crop planning problem for agricultural management under uncertainty. It is significant that agricultural managers assign their limited farmlands to cultivation of which crops in a season. This planning is called the crop planning problem and influences their incomes for the season. Usually, the crop planning problem is formulated as a linear programming problem. But there are many uncertain factors in agricultural problems, so future profits for crops are not certain values. A linear programming model with constant profit coefficients may not reflect the environment of decision making properly. Therefore, we propose a model of crop planning with fuzzy profit coefficients, and an effective solution procedure for the model. Furthermore, we extend this fuzzy model, setting the profit coefficients as discrete randomized fuzzy numbers. We show concrete optimal solutions for each models.     

长江三角洲国际性城市群发展战略研究

国际性城市群的建设是我国城市在下世纪参与国际竞争的重要战略 ,以沪宁杭为中心的长江三 角洲城市群是我国参与 21世纪全球城市间国际竞争进而发展成为国际性城市群的主要代表 ,既分工明 确 ,又联合协作 ,是长江三角洲地区各主要中心城市实现国际性城市群战略的基本保证.     

飞行器航迹规划与三维显示

主要讨论了航迹规划的国内外现状及意义,建立了简化威胁源模型,并采用改进遗传算法进行参考航迹规划,算法采用飞行指令编码和自适应交叉、变异算子,改进了简单遗传算法,仿真结果表明该方法快速收敛到全局最优解并能够很好的规避威胁,是一种有效的航迹规划方法。最后通过OpenGL导入三维模型,并利用算法改变飞行器的飞行姿态,逼真地展现了飞行器的三维航迹。     

智能光网络规划与优化

主要根据智能光网络的特点,分析网络规划与优化的重要性和紧迫性,在简单介绍其规划和优化主要方法和应用技术的基础上,重点介绍中讯邮电咨询设计院自主开发的ASON规划与优化软件。