嵌入式控制系统在分布式测控系统中的应用

分布式测控系统以其测控范围广、构建成本低等优势而得到广泛的应用,本文针对嵌入式控制系统在分布式测控系统中的应用展开了分析讨论,给出了完整的分布式测控系统的系统架构与系统层次功能的设计方案,并在此基础上重点对嵌入式控制系统,从硬件设计和软件设计两个角度完成了嵌入式分布测控系统的构建方案,对于进一步提高分布式测控系统,以及嵌入式控制系统在分布式网络中的应用均具有一定的借鉴和指导意义。     

SimpliciTI网络协议的无线数据采集系统设计

利用TI推出的针对简单小型RF网络的专有低功耗RF协议——SimpliciTI网络协议设计了一种无线数据采集系统方案,方案中采用CC1110芯片等组成了系统硬件的中心控制器、路由节点和终端节点,并在此基础上进行软件设计。实验结果证明方案行之有效。     

浅谈分布式协同入侵检测

网络技术的不断发展,分布式计算环境的广泛采用海量存储和高带宽传输技术的普及,网络系统结构的日益复杂,都使得传统的基于单机的集中式入侵检测系统遇到了极大的挑战。传统的入侵检测技术通过在网络中放置多个传感器（探测器）收集网络状态信息,然后再把这些信息送到一个中央控制台分析处理。中央控制台的工作负荷过大,成为系统运行的瓶颈,在加上由于网络传输的延迟,探测器送给中央控制台的网络状态信息有可能不及时,这种模型在面对大规模、异构网络环境以及分布式协同攻击的情况下显得力不从心。在这样的情况下,分布式入侵检测系统（Distributed Intrusion Detection System,DIDS）应运而生,并成为目前入侵检测研究领域的一个研究热点。     

Underwater image co-enhancement based on physical-guided transformer interaction

Most existing underwater image enhancement methods only focus on enhancing a single image. However, underwater images taken in the same scene often exhibit similar degradation characteristics, which can provide richer complementary information to each other. In this paper, a novel underwater image co-enhancement based on physical-guided Transformer interaction (UICE-PTI), which adopts a multi-scale encoder–decoder structure to effective mine the rich semantic information, is proposed. Specifically, considering that the degradation of underwater image is directly related to scene depth, the Dark Channel Prior-guided Transformer (DCPT) module is embedded into the framework before the preliminary feature extraction. Then, the convolution operation in the preliminary feature extraction is proposed for the local degradation of the underwater image. After that, considering the non-local and heterogeneous degradation of the underwater images across different channels and pixels, the CS-Transformer block with second-order statistics is proposed, which incorporates both channel and spatial Transformer modules. Furthermore, considering the rich complementary information between images of the same scene for enhancement, the Feature Transformer Interaction Module (FTIM) is proposed to capture the correlation between two branches in the network bottleneck layer. Additionally, the proposed UICE-PTI can also be extended to underwater stereo image enhancement. Finally, the experimental results demonstrate the superior performance of the proposed UICE-PTI and the effectiveness of each module.     

数据库外层安全技术的关键问题探讨

在当前信息化社会的大前提下,越来越多的资源与信息被放入数据库供大家使用,因此,数据库的安全显得尤为重要。数据库安全研究的重点在于如何保护数据的机密性、完整性和有效性。目前除了在外部加强数据库的安全性以外,最有效的方式就是对数据库内的数据进行加密储存。     

基于Sobel算子的快速图像匹配检索方法

给出一种较目前多数检索方法更为高效,快速的图像匹配检索方法。本算法首先利用Sobel算子对原始图像的边缘信息进行处理,然后对图像进行二值化处理,对所得的图像矩基于边缘进行分块实体提取,再将实体与目标图像矩进行比对处理,通过阀值的设置来判断图像的匹配程度,进而达到图像检索的目的。     

高校“计算机维护”教学探索

计算机是我们生活中不可或缺的工具,出现故障就会影响到我们正常的生活和工作,计算机维护是计算机正常运行的保障,但是计算机维护教育并不是高校计算机基础教育,本文就在高校开展计算机基本维护教育的必要性,从教学目的、内容,教材建设、教学和实训环境的建设方面提出了建议。     

自绘界面绩点计算器的实现

绩点计算是高校教务信息管理的重要环节。由于不同的高校的课程数量、课程学分、绩点计算公式、学生信息变动等情况不一致,导致了绩点计算器的设计与实现有一定的难度。介绍了一种自绘界面的绩点计算器的实现方法,具有界面美观、运行效率高等特点.测试结果表明可很好的满足绩点计算的需要。     

Clutter在嵌入式Linux中的研究与应用

Clutter是移动Linux平台中用具有创新性的开源图形库,其显著特点是支持三维图形和动画GUI,以及使用脚本语言描述图形用户界面。基于Clutter的应用程序开发,采用Clutter和GTK＋的混合方案是很好的选择。介绍了Clutter的软件架构、动画编程模型,以及集成库Clutter-gtk的基本结构、事件处理和应用程序开发实例。     

Effect of cation substitution on the water splitting performance of spinel cobaltite MCo2S4 (M = Ni,Cu and Co)

The introduction of different ions is an effective method for regulating electron distribution and increasing the electrocatalytic activity of spinel cobalt sulfide (Co₃S₄). However, the effect of doping different ions on water splitting performance has not been systematically clarified. Therefore, a detailed research is done to illuminate the doping of different ions on the water splitting performance of spinel cobalt sulfide MCo₂S₄ (M = Ni, Cu and Co) nanorods grown on Ni foam. To drive the electrocatalytic current of 50 mA/cm² and 10 mA/cm², the CuCo₂S₄/NF material only requires an overpotential of 240 mV for oxygen evolution reaction (OER) and an overpotential of 142 mV for hydrogen evolution reaction (HER). The results of density functional theory and experiment demonstrate that the strong water adsorption energy and the large electrochemical activity area make CuCo₂S₄/NF show good catalytic activity. The CuCo₂S₄/NF nanorods material presents superior electrochemistry performance with a small voltage 1.53 V. The water oxidation activity increases linearly before nonlinearly improving with the increasing of pH, indicating that the substrate changes from water to hydroxyl. It is noteworthy that CuCo₂S₄/NF will be transformed into amorphous oxide active species, which will act as a stable catalyst during the reaction.