Pikir dan Rasa

cogito ergo sum

Archive for June 9th, 2011

ComicReader- Dilbert: June 9, 2011

leave a comment »

http://dilbert.com

Posted from WordPress for Android

Written by sunupradana

June 9, 2011 at 11:44 pm

Posted in Cartoon

Tagged with ,

Control Systems/Root Locus – Wikibooks, open books for an open world

leave a comment »

Example: Root-Locus Using MATLAB/Octave

Use MATLAB, Octave, or another piece of mathematical simulation software to produce the root-locus graph for the following system:

T(s) = K\frac{s + 2}{(s + 3)(s^2 + 2s + 2)}

First, we must multiply through in the denominator:

D(s) = s3 + 5s2 + 8s + 6

Now, we can generate the coefficient vectors from the numerator and denominator:

num = [0 0 1 2];
den = [1 5 8 6];

Next, we can feed these vectors into the rlocus command:

rlocus(num, den);

Note:In Octave, we need to create a system structure first, by typing:

sys = tf(num, den);
rlocus(sys);

Written by sunupradana

June 9, 2011 at 4:30 pm

Posted in Control Systems, Komputer

Tagged with , , , ,

The simplifying assumptions (quote)

leave a comment »

... Don’t apply any model until you understand the simplifying assumptions 
on which it is based, and you can test their validity. 
Catch phrase: use only as directed.
Don’t limit yourself to a single model: More than one model may be useful 
for understanding different aspects of the same phenomenon. 
Catch phrase: legalize polygamy.”
Saul Golomb, “Mathematical Models—Uses and Limitations,” 1970 [87].

Dari buku:
Feedback Systems
Karl Johan Aström & Richard M. Murray
ISBN-10: 0-691-13576-2 (alk. paper)
Chapter Three, p.77

Written by sunupradana

June 9, 2011 at 2:39 pm

Posted in Engineering, Life, Quotes

Tagged with , , ,

ComicReader- Garfield: 2011/06/08. Oh you can’t stand me :-)

leave a comment »

Written by sunupradana

June 9, 2011 at 11:42 am

Posted in Cartoon, Life, Sisi ringan, Sosial

Tagged with ,

Mempelajari tegangan breakover SCR dengan LTSPICE

leave a comment »

Dari gambar karakteristik berikut sebenarnya sudah bisa dilihat gambaran umum kondisi breakover dari SCR.[Credit update:Ini adalah gambar kurva karakteristik elektrik dari SCR yang saya ambil dari dokumen yang dikeluarkan oleh Teccor (sekarang Littelfuse) pada 2002.]
Read the rest of this entry »

Written by sunupradana

June 9, 2011 at 11:30 am

Khan Academy (via SunuVis)

leave a comment »

Ini adalah salah satu sumber inspirasi dan contoh yang sangat nyata dari betapa kuatnya dampak penyampaian informasi dengan format multimedia melalui Internet.

Setahap demi setahap saya mencoba mencapai hal yang hampir serupa, tentu dengan beberapa penyesuaian dengan target yang berbeda. Sampai saat ini sebagian besar “jalan dan jembatan” sudah selesai dibangun. Sebagian content sudah dicoba dibuat. Masih perlu waktu untuk membangunnya lebih baik, saya harus berbagi waktu untuk menyelesaikan kewajiban yang lain…sebagaimana hampir setiap orang 🙂


Khan Academy

 

 

 

via khanacademy.org “Watch. Practice. Learn almost anything—for free. What started out as Sal making a few algebra videos for his cousins has grown to over 2,100 videos and 100 self-paced exercises and assessments covering everything from arithmetic to physics, finance, and history.” … Read More

via SunuVis

Written by sunupradana

June 9, 2011 at 9:59 am