DeepSpace

Given an arbitrary system, we can use various methods to describe it such as Transfer Function, Differential Equations and State Space Model. Here we mainly foucos on State Space Model and solve following questions, What is State Space Model? How to contruct the State Space Model of a specified plant? How to convert State Space Model to other description methods like Transfer Function? What is State Space Model? State space model (SSM) refers to a class of probabilistic graphical model (Koller ...

subspace A subspace of a vector space VVV is a subset HHH of VVV that has two properties. HHH is closed under vector addition. That is, for each uuu and vvv in HHH, the sum u+vu+vu+v is in HHH. HHH is closed under multiplication by scalars. That is, for each uuu in HHH and each scalar ccc, the vector cucucu is in HHH. Note In some materials, HHH has the third property that The zero vector of VVV is in HHH. This property could be inclued in Property 2 while c=0c=0c=0. For example, A line thro ...

System Dynamics 研究的究竟是什么？ 与单纯的Dynamics（动力学）的含义不同，system dynamics 研究是的系统的动态特性，和 static system 相对应。要理解系统的动态特性，首先要从静态系统开始阐述。 静态系统 以电路系统为例，如果电路仅为一个电阻R，那么在受到施加在该电阻上的电压V时，电路上瞬时产生电流I，并有熟知的公式 I=VRI = \frac{V}{R} I=RV​ 此简单的系统我们称之为静态系统，因为其变化是瞬时的，当电阻上的电压变化时，电流也随之变化。 动态系统 假如在电路中引入动态元件电感器（或电容器），那么因为该元件的动态特性，当电路中的电源电压发生变化时，电路中的电流I将不是瞬时发生变化，而是有一个渐变的过程，该过程无法用简单的代数方程表示，而是需要用微分方程来表示： LdIdt+RI(t)=v(t)L\frac{dI}{dt} + RI(t) = v(t) LdtdI​+RI(t)=v(t) 其中v(t)v(t)v(t)随时间变化的电源电压。 因此，System Dynamics研究的就是系统的动态特性，系统的某个条件发生变 ...

兜兜转转，最终还是在新冠的危机下选择离开最安全的祖国，来到荷兰这边留学。第一次独自离开中国，来到语言不同的地方，面临的不仅有学习上的困难，更多的是生活上的种种问题。在此做个总结，算是对自己打破舒适区的一个交待，也可以给后来人一些经验。 预约签证 从学校拿到录取通知书以后，就可以在学校的OSIRIS系统上与学校进行确定，在把offer确定以后，预约签证的事情便可以同步开始进行了。 等待学校的IND的邮件 荷兰的学校会帮忙在荷兰的**Immigration and Naturalisation Service(IND)**上申请学生过来的签证许可，等拿到该邮件的许可后便等可以在荷兰学习生活了。 带着IND的approval letter在荷兰驻中国大使馆上预约 学校邮件中会包含有IND的approval letter，该letter中包含有V-number，凭借此号码可以在大使馆网站上预约MVV的签证了。预约签证后，在预定的时间内带上有效的护照，录取通知书，approval letter等有效材料去大使馆采集指纹与盖章即可。盖章后的护照会在最多14个工作日后通过快递送回。 安排 ...

问题 Hexo 在使用 Mathjax 渲染数学公式的时候，由于 Markdown 语法与 Mathjax 语法冲突的问题，可能会导致使用到_, \ 符号的公式渲染出现错误。 解决方法 有多种解决该问题的方法，但是不同的方法都有各自的优缺点，根据自己的需要选择合适的方法即可。 修改源码 优点：部署简单，渲染的兼容性最好 缺点：修改源码可能引入额外的bug，不利于自动化部署 使用pandoc渲染引擎 优点：操作简单，可用于自动化部署 缺点：需要安装pandoc, 引入额外的开销，博客的部分格式需要注意 修改源码 更换kramed渲染引擎 hexo-renderer-kramed渲染引擎是基于hexo-renderer-marked引擎修改的，该引擎修复了一些marked引擎存在的bug，但是仍然无法完美的渲染数学公式。 12npm uninstall hexo-renderer-marked --savenpm install hexo-renderer-kramed --save 修改kramed引擎代码 到博客根目录下，找到node_modules/kramed/lib/ ...

转载自：通過 travis-ci 或者 GitHub Actions 自動化部署 GitHub Pages 和 Coding Pages GitHub Actions GitHub Actions 是 GitHub 於 2019 年底推出的自動化流程工具，它的功能很強大。而我們只需要用到它的構建。由於是 GitHub 自家的工具，我們無需再額外的註冊賬號，GitHub Actions 也集成在了 GitHub 界面上，我們只需點擊 Actions 進行創建。 創建 Actions 在 Hexo 目錄的倉庫，點擊 Actions Tab, 然後點擊 Set up a workflow yourself 把以下代碼複製到代碼框去, 注意如果倉庫中使用到子模塊，則需要將submodules設置為true 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152name: 自動部署 Hexoon: push: branches: - mast ...

Description Sometimes we have to include other Git repositories which are thrid-party repositories into our own Git repository. Git sumodules allow us to get it and track changes in several repositories via a centeral one. The extra repositories could be located anypwhere in a parent Git repository’s workspace and are configured through .gitsubmodules file located at the root of the parent repository. Creating a submodule Add a submodule Clone a repository into the Local Folder as a submodule a ...

Install dependencies Install Nodejs and npm In order to install hexo, Node.js and npm are required to be installed first. Ubuntu (install Node.js LTS - v12.x): 12curl -sL https://deb.nodesource.com/setup_lts.x | sudo -E bash -sudo apt-get install -y nodejs Windows: Download and install Node.js from its offical website. Install Hexo Hexo is a fast, simple & powerful blog framework, powered by Node.js. Hexo can be installed easily by npm: 1npm install hexo-cli -g npm will be installed aut ...

All functions to handle file are provdied by operating system. In modern operating system, common programs are forbidden to read and write disk direcctly. Hence, file handling is an operation which requests operating system to provide a file object and common programs operate files via handling the file object. Python Create a File Object To create a file object, we need to use the built-in open function. The open function returns the file object that contains methods and attributes to perform v ...

Model Predictive Control (MPC) is an advanced method of process control that is used to control a process while satisfying a set of constraints. It has been in use in the process industries in chemical plants and oil refineries since the 1980s. In recent years it has also been used in power system balancing models and in power electronics. Model predictive controllers rely on dynamic models of the process, most often linear empirical models obtained by system identification. The main advantage o ...