采用Tomlinson-Harashima预编码的多天线多用户系统的低复杂度用户选择算法

针对采用Tomlinson-Harashima预编码(THP)的下行多天线多用户系统,提出了一种基于启发式Gram-Schmidt(G-S)正交化的低复杂度的贪婪用户选择算法.仿真结果表明,该算法的系统吞吐量性能非常接近最优遍历搜索的性能,优于迫零波束成型准正交用户选择(ZFBF-SUS)方案的性能,并且在容量域上具有渐进最优性.     

个性化图像检索中用户兴趣模型的构建方法

针对个性化图像检索的语义鸿沟问题,提出了一种新的用户兴趣模型的构建方法。将用户兴趣模型分为长期兴趣和短期兴趣：用户的短期兴趣由图像的低层特征映射得到;用户的长期兴趣经过推理机推理,将短期兴趣映射为高层语义得到,从而弥补语义鸿沟。实验结果表明,经过用户兴趣模型过滤的图像检索结果符合用户的个性化要求,相比已有方法在查准率和查全率上取得了明显的改善。     

自主管理灌排区探讨

自主管理灌排区是一种新型的农业灌溉管理模式,它通过组建供水单位或供水公司和用水者协会,建立符合市场机制要求的供、用水管理制度,实现用水者自主管理灌区水利设施和有偿用水,保证灌区的良性运行。     

Household energy use patterns and social organisation for optimal energy management in a multi‐user solar energy system

Multi‐user systems (MUS) for electrification of rural villages have specific advantages compared with individual systems (SHS). However, as MUS serve multiple consumers, shared energy use presents a challenging problem to the communities. Despite the increased performance of MUS over SHS, they still produce a limited amount of available energy, and users cannot consume as much electricity as they wish without considering the needs of the other users. This means that energy distribution among village residents has to be organised and energy consumption has to be controlled. There are different ways to achieve energy distribution. One possibility is to leave it to the users themselves to organise rational energy use according to their needs and daily routines. For the development of a self‐managed scheme, knowledge is required not only of the users' total energy consumption, but also of their individual energy use patterns. With knowledge of the community's energy consumption habits, rules for adequate energy use can be developed more accurately. The present study describes community energy management in a Cuban village using a central photovoltaic installation. Applying different methods, data were collected in order to identify individual energy use patterns and to investigate how villagers distribute energy and what rules of use are in effect. We wanted to find out whether their energy management leads to well‐adapted energy use patterns and reasonable system performance. The results show that the village residents have developed rules and agreements for coordination of their energy use that have led to good adaptation to the dynamics of energy production. Copyright © 2006 John Wiley & Sons, Ltd.     

基于 Frank-Wolfe算法的路径交通量求解方法

针对用户均衡交通分配问题,提出一种可以避免穷举网络中的所有路径的基于Frank Wolfe算法的路径交通量求解方法。它在已知一组满足用户均衡规则的基于终点的路段交通量和交通网络中各个OD（origin destination）对间的最短路集合的前提下,运用一个算法确定出一组满足用户均衡规则的路径交通量。文中通过算例说明该方法是有效的,并通过比较指出该方法在存储内存、计算结果以及计算速度方面优于其他基于路径算法。     

可视化输配电网状态分析软件包的开发与实现

以图形用户界面的实现为重点,介绍了可视化输配电网状态分析软件包括的开发设计思想和总结结构,阐述了该软件包括具备的功能和特点。软件包采用面向对象的思想,用Visual C＋＋进行开发,运行稳定、计算准确。     

基于Agent的信息检索的应用研究

从信息检索的现状出发,运用人工智能技术,提出一种基于Agent的信息检索方法。通过建立用户个性化信息表,辅助过滤agent在信息提取过程中的精确性,弥补了现有系统在自适应用户兴趣和交互方式等方面的不足。     

用OpenGL开发有限元可视化后处理系统

可视化系统是有限元软件不可缺少的部分.介绍了利用OpenGL图形库开发有限元模拟结果可视化系统的一些关键技术,并用此方法为锻造优化设计工具DOTFORGE软件开发了可视化后处理系统.     

UGII中标准件库的建立

介绍了UGⅡ中建立标准件的一般原则和UGⅡ(V16.0)中常用的建立标准件库的方法,对使用用户自定义特征、表达式、零件族和程序建立标准件库的方法进行了详细介绍,同时给出了这几种方法的适用场合和使用时的注意事项.     

基于Microwindows的嵌入式GUI分析及应用

嵌入式图形用户界面(Embedded GUI)是嵌入式计算机系统的核心技术之一。本文首先阐述Embedded GUI的应用现状,指出Microwindows(最新版本0.9)的优势所在;然后,分别从体系结构和应用编程接口的角度,结合源代码,深入分析了Microwindows;最后,在Red Hat Linux8.0的仿真环境下演示了Microwindows的应用。