鱼眼图像校正和配准算法研究

提出一种对鱼眼图像进行校正和配准的算法。首先把鱼眼图像从相等距离投影模型映射到参数化球面投影模型,使得合成球面全景图成为一个平移求解问题。然后使用非线性优化算法进行图像的配准。在合成场景的球面全景图以后,通过重投影球面全景图到视平面来完成虚拟场景的实时漫游。     

植物标本数据库系统发展研究

研究目前常见的单机版系统、C/S模式、B/S模式、分布式网络数据库系统和地理信息系统,并对其优缺点进行了分析,对未来发展趋势进行了展望.     

浅谈园区接入层网络安全技术

针对园区网络接入层的网络安全问题,阐述接入层网络下的端口安全技术、ARP欺骗、DHCP攻击等原理和相应的防范措施.     

料位控制测量的无线网络在NS2中的模拟

文中主要对料位控制测量无线网络ZigBee的星形拓扑在模拟软件NS2中的实现进行了研究。实现对ZigBee星形拓扑在模拟环境中的数据传输分析。并对ZigBee无线技术和NS2模拟软件各自做了介绍。最后,利用分析工具对NS2软件模拟结果文件进行分析。从而实现在2．4GHz频段上,对无线网络ZigBee的星形拓扑中各个网络参数的分析。模拟结果显示整个网络数据吞吐量和数据正确传输率满足要求,ZigBee无线网络星形拓扑可以应用于料位控制测量。     

基于HLA的铁路仿真培训系统设计

为了解决铁路运营人员的培训需求矛盾,本文设计了基于HLA（高层体系架构）的综合铁路仿真培训系统,对HLA架构在系统中的应用进行了介绍。并提出了在列车驾驶仿真器联邦基础上拓展新的仿真系统的两种实现方案。     

基于网格相邻关系的离异点识别算法

离异点是偏离部分观察对象的数据点,根据离异点所在单元的密度与相邻单元的密度相比可能偏高或偏低的特点,本文提出了基于网格相邻关系的离异点识别算法GAO。该算法用单元间的相对密度和单元质心距离来衡量单元间的离异度,根据离异度确定离异单元和离异点。实验结果表明,该算法能有效地识别出多密度数据集的离异点,算法的效率优于Cell-based算法,且适合大数据集的离异点识别。     

一种实用电子商务安全体系结构设计

电子商务的安全问题已经成为制约其发展的关键,为了提高电子商务的安全性,探讨了电子商务安全技术体系结构,揭示了各安全技术间的层次关系,创造性的提出了一种实用的电子商务安全体系,该体系基于技术手段,主要包括防火墙技术、对称加密技术、非对称加密技术、数字签名、身份认证等技术。从全局上把握了电子商务安全机制,并重点介绍了其中的核心技术。     

Aircraft based soil moisture retrievals under mixed vegetation and topographic conditions

An unresolved issue in global soil moisture retrieval using passive microwave sensors is the spatial integration of heterogeneous landscape features to the nominal 50 km footprint observed by most low frequency satellite systems. One of the objectives of the Soil Moisture Experiments 2004 (SMEX04) was to address some aspects of this problem, specifically variability introduced by vegetation, topography and convective precipitation. Other goals included supporting the development of soil moisture data sets that would contribute to understanding the role of the land surface in the concurrent North American Monsoon System. SMEX04 was conducted over two regions: Arizona — semi-arid climate with sparse vegetation and moderate topography, and Sonora (Mexico) — moderate vegetation with strong topographic gradients. The Polarimetric Scanning Radiometer (PSR/CX) was flown on a Naval Research Lab P-3B aircraft as part of SMEX04 (10 dates of coverage over Arizona and 11 over Sonora). Radio Frequency Interference (RFI) was observed in both PSR and satellite-based (AMSR-E) observations at 6.92 GHz over Arizona, but no detectable RFI was observed over the Sonora domain. The PSR estimated soil moisture was in agreement with the ground-based estimates of soil moisture over both domains. The estimated error over the Sonora domain (SEE = 0.021 cm³/cm³) was higher than over the Arizona domain (SEE = 0.014 cm³/cm³). These results show the possibility of estimating soil moisture in areas of moderate and heterogeneous vegetation and high topographic variability.     

Coordinated ordering decisions for products with short lifecycle and variable selling price

The supplier–buyer coordination is an important policy in the supply chain management. The buyer in the two-echelon inventory system with regular selling season has to face the uncertainty of customer demand, supplier’s delivery time and variable price change. At the same time, the supplier has to consider the inventory holding and delay cost. The objective of this study is to develop an integrated supply chain strategy for products with short lifecycle and variable selling price to entice cooperation. The strategy must provide a win–win situation for both the supplier and the buyer. A numerical case example, sensitivity analysis and compensation mechanism are given to illustrate the model.     

基于模型预测控制的移动机器人轨迹跟踪

通过分析与建立全向移动机器人运动学与动力学模型,研究了移动机器人轨迹跟踪问题。在误差模型的线性化描述的基础上使用模型预测控制方法,在满足控制约束的条件下,将样周期内最小化目标函数的优化问题转换为二次规划问题的求解,有效减低了计算量。结果表明该方法对移动机器人的轨迹跟踪控制是有效可行的。