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2021年四川烟草考试试卷

Abstract—Transfer learning aims at improving the performance of target learners on target domains by transferring the knowledge contained in different but related source domains. In this way, the dependence on a large number of target domain data can be reduced for constructing target learners. Due to the wide application prospects, transfer learning has become a popular and promising area in machine learning. Although there are already some valuable and impressive surveys on transfer learning, these surveys introduce approaches in a relatively isolated way and lack the recent advances in transfer learning. As the rapid expansion of the transfer learning area, it is both necessary and challenging to comprehensively review the relevant studies. This survey attempts to connect and systematize the existing transfer learning researches, as well as to summarize and interpret the mechanisms and the strategies in a comprehensive way, which may help readers have a better understanding of the current research status and ideas. Different from previous surveys, this survey paper reviews over forty representative transfer learning approaches from the perspectives of data and model. The applications of transfer learning are also briefly introduced. In order to show the performance of different transfer learning models, twenty representative transfer learning models are used for experiments. The models are performed on three different datasets, i.e., Amazon Reviews, Reuters-21578, and Office-31. And the experimental results demonstrate the importance of selecting appropriate transfer learning models for different applications in practice.

这是老师布置的图像视频处理报告作业，花了挺长时间做的。看一下前面目录部分 实验一 基本图像操作方法实验 一. 实验目的 了解图像处理中的一些基本算法，对算法所能达到的效果进行分析。 二. 实验内容 1. 读入一幅图像，然后输出其直方图、统计直方图； 首先读入图片pic.jpg，在本实验中访问路径为D:/pic.jpg。图片内容如图所示： 直方图是一种图表类型，在计算机视觉领域通常用来指反映图片的亮度，色彩，强度在整个图片里面的分布情况。直方图我们可以理解成另一种理解图片的方式。 提取直方图的思路是：统计图像中像素点为某个值的个数，RGB彩色图像的提取就是将R\G\B三种颜色分别的0-255像素统计出来，然后绘制直方图。 对图像做的处理是：现将图像的R\G\B分离，然后将图像矩阵转换为一维（flatten函数）矩阵，接下来再开始统计。

这是老师布置的网络安全概论学习报告作业，花了挺长时间做的，可以参考看一下。一、信息安全风险评估概述： 信息安全风险评估是指依据有关信息安全技术标准和准则，对信息系统及由其处理、传输和存储的信息的保密性、完整性和可用性等安全属性进行的全面、科学的分析和评价的过程。信息安全风险评估将对信息系统的脆弱性、信息系统面临的威胁以及脆弱性被威胁源利用后所产生的实际负面影响进行分析、评价，并将根据信息安全事件发生的可能性和负面影响的程度来识别信息系统的安全风险。 通过系统缜密的风险分析和评估，可以导出信息系统风险的安全需求，实现信息系统风险的安全控制，从而建立一个可靠的、有效的风险控制体系，保障信息系统的动态安全。因此，信息系统安全风险评估依其应用环境、应用领域以及处理信息敏感度的不同，安全需求上有很大差别，但概括起来风险评估可以明确信息系统的安全现状，确定现在的主要安全威胁，指导信息系统安全的建设体系方向。这是第一段内容，大概有十几页