改进的万有引力公式

根据广义相对论给出的行星运动方程，导出如下改进的万有引力公式F＝－GMm/r^2-3G^2M^2mp/c^2r^4应用该公式可给出光线近日偏折问题的准确解。     

Neural network development for the forecasting of upper atmosphere parameter distributions

This paper presents a neural network modeling approach to forecast electron concentration distributions in the 150–600 km altitude range above Arecibo, Puerto Rico. The neural network was trained using incoherent scatter radar data collected at the Arecibo Observatory during the past two decades, as well as the Kp geomagnetic index provided by the National Space Science Data Center. The data set covered nearly two solar cycles, allowing the neural network to model daily, seasonal, and solar cycle variations of upper atmospheric parameter distributions. Two types of neural network architectures, feedforward and Elman recurrent, are used in this study. Topics discussed include the network design, training strategy, data analysis, as well as preliminary testing results of the networks on electron concentration distributions.     

内矩形螺旋槽加工及其测量方法

以某型离合器轴为研究对象,对内矩形螺旋槽的加工及测量方法进行了探索、研究,并在生产中得到实际应用,具有广泛的推广价值。     

基于米勒定律的机载电子设备可靠性研究

机栽电子设备在其寿命周期内要经受各种严酷环境的考验，每种恶劣环境都会对其疲劳寿命造成损伤。米勒定律在电子设备可靠性评估中得到诸多应用，以其为基础，分析振动及温度冲击环境对电子设备的结构件及元器件寿命的影响，对电子设备可靠性进行了评估。     

A New Exposed-terminal-free MAC Protocol for Multi-hop Wireless Networks

This article presents a new multichannel medium access control (MAC) protocol to solve the exposed-terminal (ET) problem for efficient channel sharing in multi-hop wireless networks. It uses request-to-send and clear-to-send (RTS/CTS) dialogue on a common channel and flexibly opts for conflict-free traffic channels to carry out the data packet transmission on the basis of a new channel selection scheme. The acknowledgment (ACK) packet for the data packet transmission is sent back to the sender over another common channel thus completely eliminating the exposed-terminal effects. Any adjacent communication pair can take full advantage of multiple traffic channels without collision and the spatial reuse of the same channel is extended to other communication pairs which are even within 2 hops from them. In addition, the hidden-terminal effect is also considerably reduced because most of possible packet collisions on a single channel are avoided due to traffic load balance on multichannels. Finally, a performance comparison is made between the proposed protocol and other typical MAC protocols. Simulation results evidence its obvious superiority to the MAC protocols associated with other channel selection schemes and traditional ACK transmission scheme as well as cooperative asynchronous multichannel MAC (CAM-MAC) protocol in terms of four performance indices: total channel utilization, average channel utilization, average packet delay, and packet dropping rate.     

基于Master/Detail构架的航电专用配置工具设计与实现

本文重点讲述如何利用Master/Details结构来实现航电专用配置工具,并介绍了实现该结构所需要的软件和硬件环境,以及Master/Details结构的实现过程。以解析XSD文档生成解析树和配置文件为例,验证了Master/Details结构能够很好得支持航电专用配置工具的实现。     

航空电子核心处理机实现技术研究

航空电子核心处理机已经成为新一代航电的核心，采用了综合化的设计思想，其设计的复杂性远远超过了联合式核心处理机。提出了一种综合化航空电子核心处理机的硬件实现技术，提出了一种微内核体系结构来实现强分区实时系统，并且支持微内核上操作系统的灵活移植。     

基于HS3282的ARINC429航空通讯总线设计

ARINC429通讯总线已经广泛应用在航空电子系统中,成为机载设备之间通讯主要接口。简要地介绍了ARINC429接口的硬件设计和软件算法。在航电系统通讯设计中具有典型性和实用性。     

机载光纤通信网——B－777OLAN

计算机局域网及光纤技术在新一代的Ｂ７７７客机上已成功应用。本文分析了Ｂ－７７７客机上的光纤通信网的组成及特点，对主要接口的工作情况作了研究，为了解新型电子系统提供了一个新的视野     

时滞细胞神经网络平衡点的全局指数稳定性研究

利用常数变易法和变量替换的方法，研究了具有时滞的细胞神经网络平衡点的奎局指数稳定性，给出了网络平衡点的全局指数稳定性的充分判据。