Diy 筆記簡易裝訂成書

要裝訂成書一定要跑影印店嗎？我拿一本工研院的成果彙編拆開當封面，用handpress小型金屬加工工具車洗在筆記頁邊打小洞，並且用銅線穿過打的洞並且綁緊，這樣就可以把筆記做成冊，然後拿個厚紙板將頁邊包起來。不漂亮，但是很實用，右邊翻頁邊我有注意有貼齊，因此很好翻。線也綁得很緊因此翻開完全不會鬆動。零成本的裝訂。

2016八月。哥不是開玩笑的，現在自己的筆記我都自己裝訂拉，哈哈哈。後來發現也不用鐵絲，只要用粗一點的線綁就可以了!

practical 400V pulse trigger generator circuit - MultiSIM

Use python matplotlib to create 3D vector-based graphics, 3D vector graphics DIY

I drew the following graphs using Python and it's Matplotlib. If you are interested in the python code, they are here (not including the first gyroscope figure, will be added later). I am trying to improve the code into many functions/modules so that drawing can be convenient and automated. The part related to plotting starts from line 128, because this is just a portion of another bigger project. Just want to show this is not as time-consuming as one may think it is. We can create or draw beautiful vector-based graphs without buying expensive software like Adobe Illustrator or Acdsee Canvas. However as you can guess with this method you will need the numerical x,y,z locations of everything! (which is generated from yet another portion of the program!)

今天妳要嫁給我 樂團譜

還在修改中

Marry Me Today by whymrandersonkt

Python code for 3D rotation simulation (core algorithm: iteration of direction cosine matrix)

(ongoing revision persists...)

Iteration of DCM with angular velocity in body frame. (This is the module. Import it in Python to use the iteration method.)
An example. (A test code.)

The background theory is in this post (in Chinese language though, I want to translate it into English but it takes time. Hope someone is interested in translating it!). And it has a python simulation of a rotating symmetric top in 3D motion.

The approximation of rotation by iteration of DCM is discussed in this textbook[1]. The approximation of rotation ωdt is also discussed. Here I use ω(t+dt)dt to approximate the rotation from t to t+dt. This is discussed in the same post.

[1]  D.H. Titterton and J.L. Weston, Strapdown inertial navigation technology, Peter Peregrinus

Ltd., London UK, 1997

模範生制度與無為而治

" 不尚賢，使民不爭；不貴難得之貨，使民不爲盜；不見可欲，使民心不亂。
  是以聖人之治，虛其心，實其腹，弱其志，強其骨。
  常使民無知無欲，使夫智者不敢爲也。
  爲無爲，則無不治。"

- 老子道德經 -

新聞http://buzzorange.com/2015/10/16/why-do-we-need-model-student/

direction of friction force of rolling objects 有外力作用的的純滾動摩擦的作用力方向討論

這是一題常見於研究所考試試題的延伸討論。

試題舉例：國立成功大學96學年度碩士班招生考試試題，編號224，系所:醫學工程研究所甲組，科目：工程力學

這邊詳細的討論幾種較難的延伸型態，並審視磨擦力作用於滾動物體的方向，因摩擦力的方向很容易弄錯。有趣的是這些型態在日常生活中都很常見。

A sectional material I wrote up for university physics. These are more advanced problems for 1st and 2nd year engineering in university.

重新將我的手稿排版(latex): 排版完成2016/6/18

Direction of Friction in rolling motion (without slipping)

我的部落格內的相關文章：
http://whymranderson.blogspot.tw/2013/06/3-dimentional-rolling-coin-simulation.html
http://whymranderson.blogspot.tw/2013/02/two-coins-roll-without-slipping-puzzle.html

舊手稿

direction of Rolling Friction