Nondestructive Electrical Resistivity Method to Map the Drainage System of Football Playgrounds

Geophysical surveys could contribute significantly to remediation programs for damaged buried engineering structures. Resistivity profiling and mapping techniques used in this work allow rapid and one of the most cost-effective ways of characterization and visualization of internal defects of drainage and watering systems of football playgrounds in a nondestructive way. Cost-effective and nondestructive testing can be valuable assets for diagnosis, realization, and restoration of football playgrounds.     

一种射影变换的图形图像纠正原理

由于各种因素的影响,地形图会发生不规则变形,因此,必须对其进行纠正.为此提出了一种射影变换纠正法,叙述了其纠正方法和纠正原理,并总结了其优点.     

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.     

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.     

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。     

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。     

深度学习的可解释性研究综述

近年来,深度学习在很多领域得到广泛应用;然而,由于深度神经网络模型的高度非线性操作,导致其可解释性较差,并常常被称为“黑箱”模型,无法应用于一些对性能要求较高的关键领域;因此,对深度学习的可解释性开展研究是很有必要的。首先,简单介绍了深度学习;然后,围绕深度学习的可解释性,从隐层可视化、类激活映射（CAM）、敏感性分析、频率原理、鲁棒性扰动测试、信息论、可解释模块和优化方法这8个方面对现有研究工作进行分析;同时,展示了深度学习在网络安全、推荐系统、医疗和社交网络领域的应用;最后,讨论了深度学习可解释性研究存在的问题及未来的发展方向。     

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.