基于CNN的键盘电磁信息泄漏识别检测方法

针对键盘电磁信息安全问题,分析了PS/2键盘的工作原理以及信号特征,提出一种基于深度学习的检测方法。该方法针对键盘设备的电磁泄漏信号特征,对卷积神经网络(CNN)结构进行了适应性调整;结合改进的梯度加权类激活映射方法,实现了对键盘电磁信息的智能识别和精准定位。对4个按键的电磁信号进行测试,分类准确率达到了98%;在噪声环境下的分类准确率也达到了81%。将梯度加权类激活映射方法及其改进方法对键盘电磁信息的定位效果进行了对比,实验结果证明改进后的方法定位效果更佳。     

LIDAR技术在江苏沿海滩涂测绘中的应用研究

利用LIDAR技术进行江苏沿海滩涂地区测绘是国内首次利用LIDAR进行沿海滩涂、海岛礁高精度、高分辨率测绘,该项目综合运用精确大地水准面成果、连续运行参考站卫星定位综合服务系统以及数字计算机处理技术制作DEM、DOM、DLG等产品.在分析江苏沿海滩涂特点的基础上,介绍了该项目的实施过程、特点及关键技术.     

基于EJB3.0的煤矿分布式空间数据同步系统设计与实现

 本文基于EJB3.0技术设计实现了煤矿分布式空间数据库同步系统,并结合LRGIS 3.0以地测部门的采掘工程平面图为例加以阐述,保障了煤矿空间数据的一致性、时效性,结合LRGIS 3.0实现了矿山信息化管理。     

零件设计域到制造域的特征映射机理研究与应用

通过对特征映射机理及其映射过程的分析，提出一个基于零件特征模型、面向井行工程的特征映射系统。系统由预处理、筛选、提取及聚合等四个子系统组成，完成零件从设计特征到制造特征的映射，从而实现零件在特征层上的信息转换。以实例对系统进行验证。     

协同商品设计系统中产品信息集成的方法

在分析协同商品设计 (CollaborativeCommodityDesign　CCD)信息集成的特点及内容的基础上 ,阐述利用XML语言构建领域标记语言CCDML的基本思想 ,讨论STEP标准中的EXPRESS语言到XML的映射原理、方法和映射粒度的问题 ,为开展协同商品设计活动中的产品信息集成作了初步的研究与探讨。     

Surface quality of extruding metal special-shape products and frictional behavior in optimized die cavity

With the help of Complex Function Mapping theory, the complicated three-dimensional deformation problems are transferred into two-dimensional problems, and the function of strain ratio field is analyzed in the metal plastic extruding deformation. Taking the strain-hardening effect of metal deformation into account, the relationship between friction behavior and optimized mathematical model is analyzed by the numerical analysis friction energy dissipation function. As a result, the method of lowering the material hardening and decreasing the reduction ratio over multi-procedures can be used to improve the surface quality of metal special-shape extrusion products.     

Load mapping for seamless interface between hydrodynamics and structural analyses

This paper addresses the problem of a seamless interface between hydrodynamics and structural analyses. A pressure distribution on a hydro model computed from seakeeping analysis needs to be transferred to a structural model for evaluating structural strength and its integrity. However, due to the differences in the computation and representation methods for both analyses, the load on the hydro model may not be correctly transferred to the structural model, leading to a different load distribution on the structural model and resulting in some unbalanced force and moment components. In this paper, a method is proposed to solve this problem. A pressure distribution on the hydro model is mapped on the structural model through projection, and force and moment imbalances on the structural model are eliminated through optimization of the nodal forces on the structural model. Moreover, a viscous force distribution along the center of each member of the hydro model is transferred to the nodal forces on the structural model based on the minimum distance measure with resolving any force and moment imbalance. Examples are presented to demonstrate the validity of the proposed method.     

Advanced Adaptive Sonar for Mapping Applications

An advanced adaptive sonar module is described, capable of being configured to different circumstances and distances according to reflectors found in the environment. Thanks to the sensory distribution, it is possible to identify three basic types of reflector (planes, edges and corners). Furthermore, a heuristic map of the environment is built. The proposed methods have been computationally optimized, and implemented in a real-time system based on a Field-Programmable Gate Array (FPGA) and a Digital Signal Processor (DSP). Results have been obtained in the detection, classification and mapping of obstacles; and finally testing has been carried out on a commercial vehicle.     

Oxidation-abrasion of TiC-based cermets in SiC medium

The aim of the current study was to investigate the effect of oxidation on abrasive wear behaviour of TiC based cermets at temperatures ranging from 20 to 900 °C. Three types of material performance maps were constructed: oxidation rate maps, wear rate maps and maps showing the effect of oxidation on abrasion. Discussion on the performance of different cermet grades is supported by the SEM images combined with EDS and XRD analysis. The results should facilitate the selection of TiC-based cermets providing optimum composition of cermets for high temperature applications.     

卫星遥感数字图象地理位置纠正、分类与成图研究

本文就MSS图象的地理位置纠正、分类与成图以及有关问题进行论述。在监督分类过程中,提出并采用了“同类分组法”准则和“相对距离阈值”,以提高分类质量。在地理位置纠正方面,分析了MSS图象的畸变因素,对连续性和非连续性畸变都作了纠正。绘图程序设计中考虑了绘图机的成图特点和效率,以提高图件精度和绘图速度。绘制的杭州西湖地区与大门山地区1∶5万彩色分类图质量好,地理位置正确,自动注记出的高斯—克吕格方里网和地形图上的方里网格完全重合,使遥感分类图象“地图化”。