基于虚拟现实的无人驾驶飞机仿真训练系统

为了培训无人机控制人员，研究更为先进、成本更低、周期更短的训练方法，本文以某新型无人机为应用背景，论述了“基于虚拟现实的无人驾驶仿真训练系统”的体系结构与在PC机上的实现过程。该系统在无人机飞行仿真的基础上 ，提出了基于“超包围盒”的碰撞检测技术，使用基于图像的全景建模方法，构建虚拟现实三维飞行实景系统，使得受训人员易于沉浸其中，大大提高训练的效率。该系统研制成功，对无人机控制人员的训练和新型无人机的广泛应用具有重要的意义。     

中国股票市场的三因子模型

通过对中国股票市场从1995年7月到2000年6月所有A股股票月收益率的研究，发现股票市场具有显著的市值效应，账面市值比效应、市盈率效应和价格效应，这些效应不能用市场β值来解释，但再加上两个因子：市值因子和账面市值比因子，可以很好地解释这些效应，这个三因子模型也能够很好地解释中国股票市场众多指数的差异。     

国际标准不确定度评价体系的建立

以模糊数学为基础，提出了模糊误差总合定律，解决了误差子集Ａ和Ｂ之间的概率合成问题，并在此基础上提出了不确定度评定方法。     

A Genetic Algorithm for Delay-constrained Least-cost Multicast Routing

The delay-constrained least-cost multicast routing problem is introduced and then a related genetic algorithm is proposed. Finally, simulation results are shown to prove that the genetic algorithm is fast and effective.     

Double Trreshold-based Early Message Discarding(DTEMD) Policy in High-speed Networks

In this paper, a new selective discarding policy called double threshold-based early meassage(DTEMD) policy is present. In the DTEMD policy, two thresholds are defined through which the system can adapt to the current load without changing its operation modes too often as EMD[1] policy does. Moreover the policy gets high utility of the buffer and so improves the system performance. By adopting a new performance measure "goodput", analysis results show a remarkable performance improvement is obtained when the improved discarding policy is applied.     

Harmonic Retrieval Embedded in Hybrid Colored Noise: a Novel Pisarenko Method Based on Cross-high-order Cumulant

Spectral estimation method is an effective method in the case of parameter estimation of sinusoid signal in noises.It always applies cross-spectral estimation theory and high-order self-spectral estimation methods up to now.Yule-Walker equation based on cross-fourth-order cumulant is developed and Pisarenko method is provided in this paper.Simulation results show that the method is effective to retrieve sinusoid signal frequencies from hybrid colored noises and has good performance.     

微合金高强钢水下焊接CGHAZ中的沉淀物

对Ｘ６０、Ｘ６５和Ｘ７０三种微合金高强钢（石油、天然气输送管线用钢）水下及空气中焊接影响粗晶区（ＣＧＨＡＺ）中的沉淀物及其溶解、再析出、长大等行为进行了考察。结果发现，在水下焊接过程中富Ｔｉ粒子几乎不溶解而富Ｖ粒子较易溶解，水下焊接同空气中焊接相比ＣＧＨＡＺ中深沉物的溶解。再析出和长大等行为均有明显差异。     

优化OMR GYQ-S30型阅卷系统成绩处理软件的实现方法

分析ＯＭＲ ＧＹＱ－Ｓ３０型阅卷系统成绩处理软件使用问题，介绍其优化与改进方法。     

Genetic study on the behavior of honeybees influenced by polyandry system

Within a honeybee population, due to polyandry, there are supersister and halfsister relations, thus many subfamilies exist. For the Chinese honeybee (Apis cerana cerana F.) a phylogenetic dendrogram has been constructed in which 4 subfamilies are clustered based on DNA fingerprint patterns. And it has been observed that each kind of workers is distributed to several dierent sub-families.