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Author Archives: Allen
Network setup for KVM-QEMU
Qemu is a virtualization tool to virtualize IO including disk, network adapters. Typically, it supports 4 network models: Isolated, NAT, bridge and routing. Some materials can be found as follows:
Microsoft Edge Kiosk Mode /w Session Storage
What’s kiosk mode? If you go to fast food market, you may use vendor machine/self-assist machine to complete your shopping tasks. The applications in the modern operating systems we called kiosk. [1] Kiosk mode in MS edge The tutorials posted … Continue reading
A c# implementation of Websocket: Websocket-sharp
If you are finding a websocket library which completely implement Websocket protocol RFC 6455)[1]. I would like to introduce WebsocketSharp. [2] Performance tips Although there is no size implementation for websocket, the limitations of websocket implementations are different. The original … Continue reading
Image rendering and scaling algorithms in browsers
Image rendering control We can control the image rendering algorithms by setting image-rendering property in CSS. [1] What resize or image generation algorithms are in browser? If you’re interested in how chromium based browsers generate the images per size or … Continue reading
Blog has been migrated!
The original blog has been migrated to WordPress! 新站開張！我原本的Blog已經搬到這邊啦！
Posted in 未分類
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Logistics regression in Chinese
Here are recommended posts in Chinese for understanding logistics regressions. The readers can read them step by step. 1. 機器/統計學習: 羅吉斯回歸(Logistic regression), URL: https://chih-sheng-huang821.medium.com/%E6%A9%9F%E5%99%A8-%E7%B5%B1%E8%A8%88%E5%AD%B8%E7%BF%92-%E7%BE%85%E5%90%89%E6%96%AF%E5%9B%9E%E6%AD%B8-logistic-regression-aff7a830fb5d 2. 你可能不知道的邏輯回歸(Logistics Regression), URL: https://taweihuang.hpd.io/2017/12/22/logreg101/
Posted in Data Mining, Machine Learning
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科技的進步，學無止境
在2006年左右，我還在唸嘉義大學數學系時，跟同學分工合作，用PHP 5+Dreamweaver 寫學校處室網站，那時候學校IT不給MySQL/Sql Server，我自己還默默用很簡單的檔案系統處理函數，定義好資料結構，一行一行把「最新消息」等訊息，存在單一檔案作為offline database使用（那時候學藝不精，不知道有Sqlite可以用）。就這樣把學校處室的消息發布功能做了出來，還具備CRUD功能。 在那個大學年代，身兼學校的BBS系統站長，在那邊辛苦學習FreeBSD , Linux⋯當起MIS，三不五時就是去修伺服器，怎麼用fsck修硬碟, Make tools, build kernel 還自己去學怎麼剪RJ 45網路線，讓Server可以正常運作（可見那時候多窮，還要自己剪網路線）。 就這樣懵懵懂懂地大學畢業。 碩士班時期，實驗室還沒有積累一些關於data mining智慧資產，自己寫了一些演算法，像是PrefixSpan sequential pattern mining. 為了求效能，還全部用C++搭配STL寫。自己排crontab job，搭配bash script來產生自己要的實驗記錄。 博士班時期，老實說蠻精彩的。 當了三年的兼任助理，幫忙編hadoop教材…。為了自己的生計，還幫學校處室架設Wordpress，改別人的theme，甚至去看wordpress template怎麼寫，修掉別人模板的bug。也稍微懂得怎麼調整Apache的參數讓系統效能能夠跟得上來。 因為過去都用PHP寫網站，也順便接了幾個案子，像是做一些報名系統，多語系網站建置。 去當了幾家公司的兼任工程師，都是以C# + ASP.Net/MVC 作為主要工作技能。 曾經接了某個專利事務所的案子，幫別人寫Chrome外掛（後續做得不錯，顧客還有回鍋要我再幫忙開發，但是要顧學業，就婉拒了。） 曾幫博弈平台公司維護模組（這期間眼睛也去動手術了）。 為了打軟體競賽，還去用MongoDB，寫寫jQuery and Bootstrap。 為了做某公司的軟體專案，自己去玩Zebra ZPL印表機語言, WCF跟實作軟體序號與數位簽章演算法。 為了幫德國實驗室的同事做Big … Continue reading
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Raspberry Pi Camera + OpenCV
If you are interested in how to use Raspberry Pi Camera + OpenCV to capture images, here is a great post in Chinese. https://link.medium.com/k2aEqonas8 However, the post had something wrong. If you want to install OpenCV packages of Python 3, … Continue reading
Posted in Python, Raspberry Pi
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FFMPEG: Decode and then encode frames to JPEG images
I’ve used FFMPEG library for a while. Actually, the FFMPEG library’s decoding process flow can be described as the following picture. If you want to read the videos and then save to jpeg file, you can take a look on … Continue reading
Posted in C, FFMPEG
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The introduction for JavaScript ES6’s classes
Do not understand the class features of JavaScript ES6? You can take a look on this introduction in Chinese. https://shubo.io/javascript-class/
Posted in JavaScript
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