一种用于认知无线电资源分配的并行免疫遗传算法

提出了用于认知无线电自适应调制和资源分配的并行免疫遗传算法,并对该算法、简单遗传算法和静态调制分配算法进行了仿真.仿真结果显示,该算法具有很强的全局搜索能力和较快的收敛速度,在误码率和功率受限条件下,该算法比简单遗传算法和静态调制方式的性能更好,同时明显降低了计算复杂度.     

Cognitive radio resource allocation based on coupled chaotic genetic algorithm

A coupled chaotic genetic algorithm for cognitive radio resource allocation which is based on genetic algorithm and coupled Logistic map is proposed. A fitness function for cognitive radio resource allocation is provided. Simulations are conducted for cognitive radio resource allocation by using the coupled chaotic genetic algorithm, simple genetic algorithm and dynamic allocation algorithm respectively. The simulation results show that, compared with simple genetic and dynamic allocation algorithm, coupled chaotic genetic algorithm reduces the total transmission power and bit error rate in cognitive radio system, and has faster convergence speed.     

Adaptive Neural Network Control with Control Allocation for A Manned Submersible in Deep Sea

This paper thoroughly studies a control system with control allocation for a manned submersible in deep sea being developed in China.The proposed control system consists of a neural-network-based direct adaptive controller and a dynamic control allocation module.A control energy cost function is used as the optimization criteria of the control allocation module,and weighted pseudo-inverse is used to find the solution of the control allocation problem.In the presence of bounded unknown disturbance and neural networks approximation error,stability of the closed-loop control system of manned submersible is proved with Lyaponov theory.The feasibility and validity of the proposed control system is further verified through experiments conducted on a semi-physical simulation platform for the manned submersible in deep sea.     

自然资源大数据快速服务平台关键技术的研究与实现

目前行业内普遍存在难以实现海量空间数据快速服务（包括快速存取、显示、检索、分发和在线服务）的难题,制约了自然资源数据的共享应用。针对上述问题,本文提出了一套"基于分布式列式数据库和Hilbert空间编码规则优化海量空间数据的存取、检索、显示效率"的解决方案,对其具体技术路线进行了详细阐述,并进一步介绍了大数据快速服务平台研发和推广情况。本文旨为满足新时代经济社会发展对海量空间信息快速服务的迫切需求。     

基于生活圈理论的合肥市城市养老服务设施空间配置合理性研究

基于生活圈理论,构建了城市养老服务设施空间配置合理性评价标准,运用GIS空间分析方法,从城市、行政区及街道等不同空间层面对合肥市城市养老服务设施空间分布特征及配置合理性进行分析。研究发现：1）合肥市城市养老供给以社区养老服务为主要类型,城市养老服务设施建设数量和体量在4个行政区间存有较大差异;2）合肥市城市养老服务设施空间分布、配置合理性均由城市中心向外围地区呈圈层式递减,城市新区是养老服务供给的薄弱地段;3）合肥市城市养老服务设施空间配置合理性在街道层面差异更显著,覆盖率相似街道呈现明显的空间聚集特征。     

青海湖水量平衡分析与水资源优化配置研究

在充分收集有关资料的基础上研究青海湖1959-2000年间降水径流蒸发湖泊水位地下水补给量的动态变化建立水量平衡分析方程.青海湖水位在波动中持续下降42年来年平均水位累计下降了 3.32 m平均每年下降了0.079 m近年来下降的幅度减小. 同时青海湖储水量不断减少而湖区降水呈增加的趋势河川径流量地下水的入湖补给量 蒸发量呈现下降的趋势. 根据青海湖水平衡分析计算结果预测2010年青海湖流域耗水量将达1.27108m3为维护生态平衡和社会经济持续发展需要跨流域调水量引大济湖4.1108m3.     

台风“飞燕”登陆前后的运动特征

通过对2001年台风“飞燕”登陆前的雷达回波和地面加密观测资料的分析表明：兴化湾地形作用使微型小台风近海突然加速折向兴化湾移动，微型小台风在临近登陆时风速将出现跳跃突变，其隐蔽性的灾害特征突出。指出制作微型小台风登陆前风速的定时定量预报的必要性。     

近30年中国东北地区玉米种植体系的时空动态分析(英文)

Understanding crop patterns and their changes on regional scale is a critical requirement for projecting agro-ecosystem dynamics. However, tools and methods for mapping the distribution of crop area and yield are still lacking. Based on the cross-entropy theory, a spatial production allocation model(SPAM) has been developed for presenting spatio-temporal dynamics of maize cropping system in Northeast China during 1980–2010. The simulated results indicated that(1) maize sown area expanded northwards to 48°N before 2000, after that the increased sown area mainly occurred in the central and southern parts of Northeast China. Meanwhile, maize also expanded eastwards to 127°E and lower elevation(less than 100 m) as well as higher elevation(mainly distributed between 200 m and 350 m);(2) maize yield has been greatly promoted for most planted area of Northeast China, especially in the planted zone between 42°N and 48°N, while the yield increase was relatively homogeneous without obvious longitudinal variations for whole region;(3) maize planting density increased gradually to a moderately high level over the investigated period, which reflected the trend of aggregation of maize cultivation driven by market demand.     

基于空间相互作用模型的商业布局——以北京市海淀区为例

在分析北京市海淀区人口增长与商业发展的基础上,运用空间相互作用理论和模型, 定量地测算了海淀区各个街乡的人口潜能与商业吸引力,对该区的人口与商业分布状况及其空间互动关系进行了分析,并根据人口增长的组合预测结果对未来海淀区各个街乡商业配置进行了具体的测算,在为商业发展布局规划提供决策支持的同时,探讨一种城市商业活动的空间分析框架。     

湿地水文研究的若干热点问题

湿地水文研究是认识湿地生态系统的结构、过程与功能,进行湿地生态保护和恢复重建以及水资源合理配置的前提与基础。重点对湿地水文研究的几个热点问题进行了评述。这些问题包括,全球气候变化与人类活动影响下的湿地水文响应;湿地水文过程对湿地生态系统的影响机制;湿地水循环过程与水文模型。在此基础上,提出了基于水循环模拟的流域湿地水资源合理配置的基本思路,并对目前中国湿地水文亟待研究的重要议题进行了阐述。