基于证书链验证机制的智能终端安卓系统安全加固方案

在全球信息化的普及和移动互联网蓬勃发展的背景下,安卓系统的安全加固作为移动互联网和智能终端的新兴领域最为核心的技术之一,需要结合其所表现出来的安全问题进行深入的分析与研究.结合了证书链机制,以完整性验证为核心的安全架构,能够达到最大限度保护智能终端安全的目标.     

关口水电站地下厂房岩壁式吊车梁设计

岩壁式吊车梁是一种新型结构形式，目前尚无规范可循。关口水电站地下厂房岩壁式吊车梁的设计，采用平面力系平衡的方法来分析梁的稳定，其中壁座倾角、锚杆参数选取是岩壁式吊车梁设计的关键。对中小型水电站来讲，按照施工技术要求：把好施工质量关，是岩壁式吊车梁成败的关键。     

Path planning using a mobile anchor node based on trilateration in wireless sensor networks

In wireless sensor networks (WSNs), many applications require sensor nodes to obtain their locations. Now, the main idea in most existing localization algorithms has been that a mobile anchor node (e.g., global positioning system‐equipped nodes) broadcasts its coordinates to help other unknown nodes to localize themselves while moving according to a specified trajectory. This method not only reduces the cost of WSNs but also gets high localization accuracy. In this case, a basic problem is that the path planning of the mobile anchor node should move along the trajectory to minimize the localization error and to localize the unknown nodes. In this paper, we propose a Localization algorithm with a Mobile Anchor node based on Trilateration (LMAT) in WSNs. LMAT algorithm uses a mobile anchor node to move according to trilateration trajectory in deployment area and broadcasts its current position periodically. Simulation results show that the performance of our LMAT algorithm is better than that of other similar algorithms. Copyright © 2011 John Wiley & Sons, Ltd.     

可探测型气吹微缆的研究

随着光通信网络的发展,光网络发展由核心骨干网向城域网及接入网递进发展,光缆敷设的量与范围越来越大,敷设光缆的管道资源越来越紧张,因此对纤密度较高的微缆的需求越来越多,这种光缆光纤密度比较高,光缆成本相对较为高昂,一旦发生施工等原因造成的破坏时,会造成较大的损失。因此,对已敷设的光缆进行维护及故障处理时如何有效地定位是一个大问题,所以需要光缆具备可被探测定位的功能以方便维护、提高效率、减少损失。本文涉及了一种新型的可探测型气吹微缆,其采用内嵌钢丝的玻璃纤维中心加强件的结构,可以使用光电缆路由测试仪有效的应对敷设光缆故障处理中的探测定位问题。本文设计了五种不同的方案,从内嵌钢丝的材质以及钢丝占比量等多方面对微缆的气吹及探测等性能进行了对比验证,从而确定了可探测型气吹微缆的最优结构设计。     

Improved SpaceTwist privacy protection method based on anchor optimization algorithm

With location-based services worldwide used,private location data appealed easily in query process which caused serious security problems.So the introduction of SpaceTwist incremental nearest neighbor query algorithm,proposes protection of privacy method combined with improved SpaceTwist location optimization algorithm.The anchor point authentication server added to distributed system structure,user generate a k anonymous area according to their privacy preference and actual environment,using optimization algorithm to generate the anchor point.Forwarding users use the incremental nearest neighbor query throught the anchor point and accurate.Experiments in road network environment with different data sets show that the privacy protection works well in the algorithm,and own high work efficiency.     

高级语义信息辅助的无锚框行人检测研究

为了提高车间监控系统智能化程度和工作场景中行人检测精度,提出了一种基于计算机视觉技术的行人检测方法。采用基于高级语义信息的无锚框特征检测技术,将检测任务简化为中心点和尺度的回归预测。特征提取模块通过四阶段降采样卷积网络,得到多尺度的图像特征并融合。头探测模块分成两路卷积,并行处理特征图,获得中心点热力图和尺度信息,输出检测结果。结果表明,在CityPersons数据集R子集上,MR-2达到11.61%,加入偏移量预测分支后MR-2提升了0.6%。这证明了该人员检测方法的性能优良。     

抗浮锚桩注浆施工若干问题分析及处理措施

阐述了抗浮锚桩注浆施工工艺、施工设备、注浆工艺、注意事项、对注浆过程中出现的问题进行了分析,并提出了解决措施。     

新型穿航道海底管道防锚保护方案试验及应用

介绍穿越航道海底管道常用的防落锚保护方式及一种新型柔性防护垫,并对比这些保护方式的应用特点。针对某项目实例,提出单一及组合防锚保护方式,并对此开展落锚撞击物理试验。基于试验数据和设计规范,评估落锚对海底管道强度的影响,并根据校核结论给出海底管道最优防护方案,为工程设计及海上施工提供依据。     

REINORCING THEORY AND TECHNIQUE OF SLOPE EXCAVATION

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