What is this Process and Why is it Running【三】

audiodg.exe

Windows音频设备图形隔离进程,是一个正常的系统进程,英文名称为audiodg.exe,windows7系统不会以英文名显示。

Windows音频设备图形隔离程序是一种系统保护进程,出于系统安全需要,用于防止未授权软件或硬件捕获高清晰度视频格式文件的内容,还可以大幅度的提升耳机音质。

对于此正常进程,一般情况下不会占用太多CPU,如果占用过高的情形一旦出现,按照这几点原因进行排查:

  1. 声卡驱动的问题,进行声卡驱动的更新【贴出更新教程】https://jingyan.baidu.com/article/d169e18603a087436611d8d7.html
  2. 检查音量设置,是否音量设置过高,音量越高越容易出问题【提醒一点,音量最好保持在60%以下】

(对于其他任务是否启用过多,自我感觉没必要,因为占用CPU详细比例已经显示在任务管理器中了)

  1. 最重要也是我最不想面对的一点,如果确定不是上边的原因,都确定好了,那么还是接受电脑有可能中毒了
顺便提供如何处理这个问题
  1. 针对Skype采取措施,卸载再重装
  2. 更新声卡驱动(上面提到了)
  3. 关掉所有声音
  4. 运行音频疑难解答
  5. 扫描病毒

http://www.ghost580.com/win10/2018-01-01/23200.html【详细解决方案】
在这里插入图片描述
任务管理器中此进程以这种形式存在,发现它是件好事,但发现它的原因就…,心有余悸,开始这个故事:

10月14日,像往常一样,我在本机中插入U盘,打开U盘,并没有看到我的那堆文件,而是有一个小小的磁盘图标开头,名为U盘快捷方式的文件,我意识到有问题了,但还是手残~双击【以后一旦有意识一定不点】,接着就看到Windows Defender报威胁了

在这里插入图片描述

本来以为确定了是GandCrab病毒了,这可是2018年的新病毒啊,对于此病毒如果请企业杀毒,开价将和赎金不相上下。

不太屈服命运的灵魂促使我进行了连续实验,果然,最新的判断为蠕虫病毒

想要进行准确判断必须铤而走险进去看了,但肯定不会关掉Windows Defender强行进去的

首先我取下U盘,对电脑进行了一次全方位扫描,任务管理器中基于前两篇

What is this Process and Why is it Running【一】

What is this Process and Why is it Running【二】

进行了一一排查,确认没有异常进程后,接着进入日志,查看了那个时间段的日志

一切的一切确认好了

下一步,送进虚拟机

与主机断开连接【在虚拟机选项中】,我在Ubuntu中进行的操作

鉴于之前未安装过exfat-utils首先sudo apt-get install exfat-fuse exfat-utils安装ExFAT支持

不然会出现这种结果

在这里插入图片描述
打开U盘,首先看到的是

  1. 我的文件被放到了一个文件夹中
  2. 多了一个文件夹叫做system volume information
  3. 多了一个文件叫做autorun.exe

点击存放我文件的文件夹,进去后一直看到最深处,依次发现了wpssetting thumbs _WAJAJIEKZP.nil IndexerVolumeGuid 等文件以及它们的重复出现【其中IndexerVolumeGuid便是我上面提到的中病毒的可能原因,这是一个控制本机音量的自动执行的文件】

一波删,shift + delete 完全删除,我将U盘上所有非正常文件全部删除,将文件单独拖出来(以至于杀完毒之后U盘需要扫描恢复)对于除此之外的几个数据文件和配置文件我选择了记录

一心想着杀毒,导致很多数据我没有全部保存下来,遗憾!!!

幸运的是碰到的病毒比较好搞,遗憾没有顺着初心判断出来具体病毒的原理,至少U盘恢复了

。。。

故事讲完了,描述中有不当的地方还请提出来

大家如果也曾碰到过同样的或者不小心碰到的可以指点指点,交流交流 QQ:1223950227

### Maxwell 3D Electromagnetic Simulation Tutorial For conducting three-dimensional electromagnetic simulations using the Maxwell equations, a robust framework is essential to accurately model and analyze complex systems such as photonic devices[^1]. The process typically involves setting up the computational domain with appropriate boundary conditions, defining material properties, specifying excitation sources, and configuring solver settings. A typical workflow for performing these simulations includes: #### Defining Geometry and Materials The geometry of interest must be precisely defined within the simulation environment. This can involve creating intricate structures like grating couplers that require high accuracy in dimensions and shapes. Material parameters should also be specified carefully; this may include dielectric constants, conductivities, and other relevant physical properties depending on the application scenario. #### Setting Boundary Conditions Boundary conditions play an important role in ensuring accurate solutions by controlling how fields behave at interfaces between different regions or outside the modeled volume. Common types used are perfect electric conductor (PEC), perfectly matched layer (PML) absorbers which minimize reflections from boundaries affecting internal field distributions negatively. #### Configuring Excitations Excitations provide input power into your system under study – they could represent lasers illuminating optical components or antennas transmitting radio waves through space around them. Proper configuration ensures realistic operation scenarios while allowing meaningful analysis outcomes based upon desired performance metrics set forth during design stages. #### Running Solver & Post-processing Results Once all configurations have been completed satisfactorily according to project requirements, running solvers will compute resulting electromagnetic behaviors across entire volumes iteratively until convergence criteria met indicating stable states reached throughout analyzed areas. Afterward comes post-processing where visualization tools help interpret data more intuitively via plots showing intensity patterns over surfaces/volumes alongside numerical summaries quantifying key aspects observed visually too. ```matlab % Example MATLAB code snippet demonstrating basic setup steps involved when working specifically towards implementing FDTD method commonly employed within many commercial software packages supporting full-wave EM analyses including Ansys HFSS among others. clear; clc; lambda = 1e-6; % Wavelength definition here... dx = lambda/20; dy=dx; dz=dx;% Spatial discretization step size selection... Nx = round(5*lambda/dx); Ny=Nx; Nz=Nx;% Number of grid points along each axis direction accordingly.. dt = dx/(sqrt(eps0*mu0)*c); % Time increment calculation following Courant stability condition requirement.. Ex = zeros(Nx,Ny,Nz); Ey = Ex; Ez = Ex; Hx = Ey; Hy = Ez; Hz = Ex; for t = 1:round(Tmax/dt) update_H(); apply_sources(t*dt); update_E(); end ``` --related questions-- 1. What specific challenges arise when modeling highly dispersive materials in Maxwell's equation-based simulators? 2. How do PEC and PMC boundary conditions differ mathematically and practically impact simulation results? 3. Can you explain what makes certain excitations preferable over alternatives given particular experimental setups involving photonics applications? 4. In terms of efficiency versus precision trade-offs, why might one choose finite-difference time-domain methods instead of frequency-domain approaches for solving problems related to electromagnetics?
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