基于串行接口7289的单片机学习板设计

以ST89C51为核心的单片机学习板,用串行的接口芯片7289进行键盘显示器的控制,极大的节省了单片机的I/O口线,使得该系统板可以添加更多的硬件资源。简单实用的USB下载,为学生课外学习、课程设计、电子竞赛练习提供了方便。     

计算机辅助创新技木助推中国航空工业快速发展——CAI在中国航空工业领域的应用

计算机辅助创新(CAI)凭借其先进的创新理论方法和高效的创新设计平台,整合先进的仿真、管理等技术,将成为我国航空工业走向自主创新的有效途径.     

ELGR: An Energy-efficiency and Load-balanced Geographic Routing Algorithm for Lossy Mobile Ad Hoc Networks

Geographic routing is a highly active area of research in mobile ad hoc networks (MANETs) owing to its efficiency and scalability. However, the use of simple greedy forwarding decreases the packet reception rate (PRR) dramatically in unreliable wireless environments; this also depresses the network lifetime. Therefore, it is important to improve delivery performance and prolong MANET lifetime simultaneously. In this article, a novel geographic routing algorithm, named energy-efficiency and load-loalanced geographic routing (ELGR), is presented for lossy MANETs. ELGR combines energy efficiency and load balance to make routing decisions. First, a link estimation scheme for the PRR is presented that increases the network energy efficiency level. Second, a learning method is proposed to adaptively sense local network loads, allowing enhanced whole network load balance. The results of a simulation show that ELGR performs better than several other geographic routing algorithms; in particular it extends network lifetime by about 20%, with a higher delivery ratio.     

旋转控制固定鸭舵的导航初始化与控制算法研究

针对制导迫击炮弹的固定翼鸭舵导航初始化,设计了基于GPS信息的衰减记忆法扩展卡尔曼滤波算法,用于实时求解固定翼鸭舵的气动力合成矢量,然后结合固定翼鸭舵的气动数学模型,设计了固定翼鸭舵的导航初始化算法.并在直流电子负载系统的基础上设计了鸭舵的旋转控制算法,通过仿真试验验证了依靠GPS提供的位置速度信息和鸭舵滚转角速度信息可以快速实现固定翼鸭舵的导航初始化,为旋转控制固定翼鸭舵的工程应用,提供了理论参考.     

工科院校高等数学课堂教学的探索与实践——深化高等数学教学改革注重数学思想的渗透

本文结合本校省级精品课程"高等数学"的课堂教学,从教学方法、教学内容、数学建模等方面探讨高等数学教学改革,注重学生参与问题解决的教学环境,注重向学生渗透数学思想,注重吸收和体现新的教育思想和改革成果,理论联系实际,利用数学建模解决实际问题。     

无人机CBT教学系统研究

在美国CBT已经成为航空训练的重要教学工具,本文分析了无人机CBT教学系统的总体需求,明确了CBT的基本结构,并利用QFD对工程措施进行分析,从而较全面的对其总体技术进行了研究。     

Structure of the migrating diurnal tide in the Whole Atmosphere Community Climate Model (WACCM)

As part of an ongoing effort to understand the migrating diurnal tide generated by the NCAR Whole Atmosphere Community Climate Model, version 3 (WACCM3), we compare the WACCM3 migrating diurnal tide in the horizontal wind and temperature fields to similar results from the Global Scale Wave Model (GSWM). The WACCM3 diurnal tidal wind fields are also compared to tropical radar measurements at Kauai (22°N, 200.2°E) and Rarotonga (21.3°S, 199.7°E). The large-scale features of the WACCM3 results, such as the global spatial structure and the semiannual amplitude variation are in general agreement with past tidal studies; however, several differences do exist. WACCM3 exhibits a much higher degree of hemispheric asymmetry, lower overall amplitudes around the equinoxes, and peaks which are more confined in latitude when compared with the GSWM. Factors which may contribute to such differences between WACCM3 and GSWM are the solar heating profiles from ozone and water vapor, dissipation, and the zonal mean zonal winds. We find that the internally generated heating in WACCM3 and eddy dissipation values are both smaller than the values specified in the GSWM; the eddy dissipation fields and zonal mean zonal winds of the two models also display measurable differences in spatial structure. Comparisons with radar data show several differences in spatial and seasonal structure. In particular, the diurnal tide zonal winds in WACCM3 above Kauai are considerably larger in amplitude than those observed in the radar data, due to contributions from nonmigrating tidal components including wave numbers eastward 1 through 3, westward 2, and stationary components, which interfere constructively with the migrating component around equinox in WACCM3.     

主机外航数据处理问题分析及解决

世界航空业的快速发展，带来中航信系统中国内国际航班数据的持续大量增加,由于数据文件的设计及算法原因，处理外航数据时需占用的DBA空间越来越大，然而系统DBA空间不能无限扩大,当DBA空间无法满足计算需求时，将导致525或Storage full错误。本文在基于原来数据结构不变的情况下．调整了数据录入算法，当某城市对对应的航班计划数据达到某个限制之后，将不再增加新的航班计划数据,即不再支持航班计划数据无限扩张，修改后系统运行正常，航班计划和路由数据受影响很小．大大减少了航信主机处理外航数据时的525及Storage full错误。     

无线传感器网络中DMST拓扑控制算法

为了延长无线传感器网络的生命周期,进行了无线传感器网络中拓扑控制策略的探索性研究,提出了一种基于最小生成树的分布式拓扑控制算法(MST-based distributed topology control algorithm,DMST),该算法能够保持拓扑控制前后网络中任意两点之间最大限度K容错连通特性.在OPNET仿真平台上对该算法进行仿真,最后与无线传感器网络传统的两种节能路由协议基于信息协商的传感器协议(Sensor Protocols for Information via Negotiation,SPIN)和直接扩散协议(Directed Diffusion,DD)在同等条件下针对节点能量使用进行对比,结果表明,DMST算法使得节点能根据自身剩余能量状况对节点运行模式进行控制,达到节能目的.DMST除了能通过改变K值来调整网络的容错能力之外,还能根据节点最大移动速度和Hello包间隔进行拓扑调整,有助于保持移动网络的拓扑稳定性.