I begin noticing that I can write something to students Publish view-points to others is something that needs to be approached with caution. However, my students come to surround me and open their eyes widely for knowledge and thoughts. So, today I begin to use tag = Teaching for sharing some thought to my students.

转：Mac用Option键输入特殊符号 原作者：nuqiewuoz 在Mac默认的英文输入法下，按住Option键或者Shift+Option键，再加其它键，可以快速的输入某些常用的特殊符号，例如•, º, ®, ≠, ∑, Ω, ≈,÷,≤,¿等等，具体列表如下 原始按键 ` 1 2 3 4 5 6 7 8 9 0 - = Option + ` ¡ ™ £ ¢ ∞ § ¶ • ª º – ≠ Shift + Option + ` ⁄ € ‹ › fi fl ‡ ° · ‚ — ± 原始按键 q w e r t y u i o p [ ] \ Option + œ ∑ ´ ® † ¥ ¨ ˆ ø π “ ‘ « Shift + Option + Œ „ ´ ‰ ˇ Á ¨ ˆ Ø ∏ ” ’ » 原始按键 a s d f g h j k l ; ' Option + å ß ∂ ƒ © ˙ ∆ ˚ ¬ … æ Shift + Option + Å Í Î Ï ˝ Ó Ô  Ò Ú Æ 原始按键 z x c v b n m , .

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Apply a certificate that has longer expiration date Apply a certificate that has longer expiration date for caddy server Caddy is a popular web server that can automatically obtain and manage SSL/TLS certificates for your websites using Let’s Encrypt. The certificate expiration date is determined by Let’s Encrypt and is usually 90 days. Caddy can automatically renew these certificates before they expire. If you want to use a certificate with a longer expiration date, you might need to consider other certificate authorities or manually generate a certificate with a longer validity period.

A node.js server that receives IoT sensor data and broadcast it via web Introduction I constantly strive to easily access real-time, high-frequency data streams, or remotely deploy sensor data. Following data acquisition, the convenience of analyzing or visualizing this sensor data through algorithms is essential. This is a basic project that allows the Sensor_driven_by_MCU submit the data on to the nodejs_driven_server and allows the user record the data via web page that receives data from the nodejs_driven_server via WebSocket. see the diagram below:

B站分集视频时长获取与统计方法 学习B站分集视频时，若需要知道视频总时长，可用js把标题及时长在控制台输出，然后复制存为文本文件。 【使用方法】： 按下F12（Opt+CMD+I）进入开发者工具， 点击“Console”标题进入控制台， 在光标闪动的输入处粘贴以下代码并回车： var box=document.getElementsByClassName('list-box')[0]; var boxtext=box.innerText; var textline=boxtext.replace(/\n(?!P\d+)/g,' '); console.log(textline); 打开ChatGPT, 提问： 我要给你一个列表，你需要识别每个条目的时长。把它们的总时长加起来。你不用打印每个条目的时长。我只需要你打印出加和后的总时长即可。 条目如下： P1 001-入门到实战导学视频1 11:10 P2 002-第一天课程介绍1 05:54 P3 003-第一天课程介绍2 15:54

Linux内核升级与开启TCP BBR Reference: https://github.com/iMeiji BBR 目的是要尽量跑满带宽，并且尽量不要有排队的情况，效果并不比速锐差。 Linux kernel 4.9+ 才支持 tcp_bbr。下面简单讲述基于 KVM 架构的 virtual p server 如何开启。 附： OpenVZ 架构VPS开启BBR（容易导致判定滥用ban机，慎用！） Debian/Ubuntu TCP BBR 魔改版（不支持4.13.*及更新的内核） Debian 8+ / Ubuntu 14.04 下载最新内核，最新内核查看这里 http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.16/linux-image-4.16.0-041600-generic_4.16.0-041600.201804012230_amd64.deb 安装内核 dpkg -i linux-image-4.*.deb 删除旧内核（可选） dpkg -l | grep linux-image apt-get purge <旧内核> 更新 grub 系统引导文件并重启 update-grub reboot Ubuntu 16.04 安装 Hardware Enablement Stack (HWE)，自动更新内核 apt install --install-recommends linux-generic-hwe-16.04 删除旧内核（可选） sudo apt autoremove CentOS 6 下载更换内核，最新内核查看这里 rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org rpm -Uvh http://www.elrepo.org/elrepo-release-6-8.el6.elrepo.noarch.rpm yum --enablerepo=elrepo-kernel install kernel-ml -y 查看内核是否安装成功 rpm -qa | grep kernel 删除旧内核（可选） rpm -ev <旧内核> 更新 grub 系统引导文件并重启 sed -i 's:default=.

Fixing VirtualBox Guest Additions: Kernel headers not found for target kernel OS system for testing: CentOS7 1. why this error: The version of kernel-devel does not match the version of your running kernel. You can check them by running uname -r and rpm -q kernel-devel. 2. update the kernel follow the link or do the following: # yum update -y # rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org # yum install https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm # yum --disablerepo="*" --enablerepo="elrepo-kernel" list available # yum --enablerepo=elrepo-kernel install kernel-ml-devel kernel-ml -y #or: # yum –-enablerepo=elrepo-kernel install kernel-lt-devel kernel-lt -y # reboot After update the kernel, you can find the not-the-newest version of kernel.

Across folders’ module calling in python This topic involves understainding: how Py modules system works organizing your proj. files’ structure using the appropriate import systements 1. Proj. Structure 1.1 Packages and Modules ❤️A module is a Python file containing code and definitions. A module is just a Python program that ends with .py extension ❤️A package is a directory that contains a special __init__.py file, making it a Python package. A folder that contains a module becomes a package. see:

The URL tricks to save YouTube offline The ways below show you the most direct method to download YouTube videos by changing URL without any software. Try any of them as you need. Method 1: Change YouTube to ssyoutube youtube.com/watch?v=C6MVEwl0ceI&t=2s -> ssyoutube.com/watch?v=C6MVEwl0ceI&t=2s Method 2: Change YouTube to youpak youtube.com/watch?v=C6MVEwl0ceI&t=2s -> youpak.com/watch?v=C6MVEwl0ceI&t=2s Method 3: Change YouTube to youtubepp youtube.com/watch?v=C6MVEwl0ceI&t=2s -> youtubepp.com/watch?v=C6MVEwl0ceI&t=2s Method 4: Change YouTube to pwnyoutubepp youtube.com/watch?v=C6MVEwl0ceI&t=2s -> pwnyoutube.com/watch?v=C6MVEwl0ceI&t=2s FAQ: Are there any video quality restrictions when downloading from YouTube