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<h1>Notes on numerically solving diffusion equations.</h1>
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<p>Many phenomena in various science fields are mathematically expressed by using the well-known evolution equations. The diffusion equation is one of them, and mathematically corresponds to the Markov process in relation to the normal distribution rule.<br/>
<div style="text-align: right"> <cite> **—<a href="https://en.wikipedia.org/wiki/Diffusion_equation">Wikipedia: Diffusion equation</a></cite> </div></p>
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<span class="date">2018/1/7 14:46 PM</span>
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<h1>Notes on reverse SSH tunnel: Connect to servers behind NATs and firewalls through publicly available middle server</h1>
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<p>In some cases, the servers you use in office/school may be behind some NAT or firewall so that you can not access these servers from the external internet. This can be inconvenient sometimes. A simple walkaround of this problem is reverse SSH tunneling. For all Unix like systems(e.g. Linux, MacOS), this just works fine.</p>
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<h1>Slack webhooks for dummies: a beginer's guide to making your own slack bots using Python</h1>
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<h2 id="toc_0">What is slack</h2>
<p>Slack is a cloud-based set of team collaboration tools and services, founded by Stewart Butterfield. Slack began as an internal tool used by their company, Tiny Speck, in the development of Glitch, a now defunct online game. The name is an acronym for "Searchable Log of All Conversation and Knowledge".<sup id="fnref1"><a href="#fn1" rel="footnote">1</a></sup></p>
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<h1>Some notes on the use of "sed" command for text processing automation</h1>
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<p><strong>sed</strong>, short for "stream editor", allows you to filter and transform text. A stream editor is used to perform basic text transformations on an input stream (a file, or input from a pipeline). While in some ways similar to an editor which permits scripted edits (such as ed), <strong>sed</strong> works by making only one pass over the input(s), and is consequently more efficient. But it is <strong>sed</strong>'s ability to filter text in a pipeline which particularly distinguishes it from other types of editors.<sup id="fnref1"><a href="#fn1" rel="footnote">1</a></sup></p>
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<a href="15153040186127.html">Notes on numerically solving diffusion equations.</a>
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<a href="15152601961161.html">Notes on reverse SSH tunnel: Connect to servers behind NATs and firewalls through publicly available middle server</a>
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<a href="15152599330196.html">Slack webhooks for dummies: a beginer's guide to making your own slack bots using Python</a>
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<a href="15152598378572.html">Some notes on the use of "sed" command for text processing automation</a>
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