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Archive for June 9th, 2011

ComicReader- Dilbert: June 9, 2011

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Written by sunupradana

June 9, 2011 at 11:44 pm

Posted in Cartoon

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

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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);

Written by sunupradana

June 9, 2011 at 4:30 pm

Posted in Control Systems, Komputer

Tagged with , , , ,

The simplifying assumptions (quote)

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... 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

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

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Written by sunupradana

June 9, 2011 at 11:42 am

Posted in Cartoon, Life, Sisi ringan, Sosial

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Mempelajari tegangan breakover SCR dengan LTSPICE

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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)

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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

You will never know (“kepastian” yang tidak abadi)

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FB note by Sunu Pradana on Tuesday, September 15, 2009 at 5:02pm

There once was a small village where a young child was bought a horse for his 9th birthday.. the villagers heard about this, and said that this was fantastic news… but when the Zen Master heard about this he simply said “we shall see”…

Three years later the boy fell of his horse and broke his legs, the villagers were distrought, “what terrible news” they said.. but the Zen Master simply said “we shall see”.

One year later the country went to war, and due to his injury the boy was able to stay at home instead of fighting, “what great news” said the villagers, and once again, the Zen Master simply said:

“we shall see”.

The purpose of me sharing this tale with you is to reinforce the fact that life is a series of ups and downs, and if you are at a low point right now, it may be for a reason, and if you are on a high, don’t take it for granted, don’t get too comfortable or lethargic, keep on working, and keep on having fun.

Remember, Life is just a series of peaks and troughs. And you don’t know whether you’re in a trough until you’re climbing out, or on a peak until you’re coming down. And that’s it you know, you never know what’s round the corner.

Dikutip sepenuhnya dari http://deanhunt.com/the-zen-master-and-the-villagers/

Written by sunupradana

June 9, 2011 at 1:13 am

Posted in Filsafat, Life