My Other Blog

Sometimes you may want to try visiting my other blog (http://erikdt.blogspot.com/).

Why a separate blog? Just in case I shit in my blog. So that the contamination can be contained.

I lied. I’m simply Torn between Two Blogs.

Have a nice day and don’t forget that shit happens.

Yet Another Lamentation of Okayness

I’m useless, but as long as I’m not harmful, I guess that’s okay.

Nobody likes me, but as long as nobody hates me, I guess that’s okay.

I’m not really okay, but as long as I can make myself seem okay, I guess that’s okay.

I’m not certain of what religion I am, but as long as I believe in God, I guess that’s okay.

I don’t think that everything’s okay, but as long as I can guess that everything’s okay, I guess that’s okay.

I don’t think I’m okay, but I guess I’m erik.

Difusi tanpa Angin

Suatu difusi adalah suatu 3-tupel yang terdiri atas 3 medan skalar yang berdimensi sama (\rho, \alpha, \phi) yang memenuhi persamaan berikut (disebut Persamaan Difusi tanpa Angin).

\frac{\partial \rho}{\partial t} = \alpha \cdot \nabla^2 \rho + \phi

\rho, \alpha, dan \phi masing-masing adalah medan skalar dengan n dimensi spatial dan 1 dimensi temporal. \rho disebut diffusor, \alpha disebut diffusivity, dan \phi disebut inflow.

Persamaan tersebut bisa memodelkan penyebaran kentut di ruang tertutup. Misalkan ada yang kentut di ruangan tertutup. \rho adalah konsentrasi kentut yang terdefinisi untuk setiap titik dalam kontinuum ruang-waktu. \alpha adalah seberapa cepat suatu titik menghantarkan konsentrasi kentut. \phi adalah laju konsentrasi kentut yang masuk ke dalam sistem. Jika daerah dengan konsentrasi kentut tinggi diberi warna hitam dan daerah dengan konsentrasi kentut rendah diberi warna putih, maka seiring dengan membesarnya t, daerah hitam akan meluas sambil memudar. Semakin gelap, semakin terasa bau. Semakin terang, semakin terasa samar.

Kuantitas total kentut yang berada dalam ruang adalah

\frac{\partial}{\partial t} \int_V \rho \cdot \partial V = \int_V \phi \cdot \partial V

dengan V hipervolume tak-hingga yang mencakup seluruh ruang. Jika \phi selalu 0, maka terjadi konservasi kentut, yaitu kuantitas total kentut dalam ruang tidak berubah terhadap waktu.

Sekarang kalian bisa berkata dengan bangga ke teman-teman kalian, “I farted inside the hypervolume which spans the entire n-dimensional space, and it diffused. The hypervolume has a memory which extends back to the infinite past.”

Bedakan diffusion, dispersion, dan dissemination. Mereka serupa, tetapi tak sama.

Semoga tulisan ini bisa sedikit menambah pengetahuan Anda tentang medan skalar, kentut, hipervolume, dan difusi.

Don’t Say Merry Christmas

and don’t say Happy New Year either, neither other merry-merries nor happy-happies.

First: You are contributing to the overloading of communication systems. This is a distributed denial of service, and urgent messages may get dropped and lost, just because of your unimportant greetings. Also, as a consequence of Shannon’s information theory, when the string “Merry Christmas” occurs so often every now and then, its probability of occurring is high, and therefore the amount of information it carries is low, dropping asymptotically to zero.

Second: You are disturbing the recipients by implicitly obliging them to respond. A part of this is due to the currently established moral values of stigmatising people who don’t respond to greetings with the label ‘rude’. This also aggravates the previous problem of communication system overloading by a factor of at least two. The recipient isn’t necessarily happy nor grateful for receiving such message from you. He/she may be busy, and your interruption is wasting his/her precious time.

Third: You are celebrating something which is not even worthy of celebration. What really happened on that day, anyway? Are you really sure that it happens on that day? Do you really know what you are celebrating and understand why you are celebrating it? Can you know? Well, in the first place, you can’t know; so much time has passed, and all you can do is to believe. Do you really need to celebrate that? Will you make someone happy? You behaviour is simply conditioned, and you are not showing intelligence as you are supposed to be exhibiting.

And last but not least, don’t obey any of whatever imperation I expose here. If you want to celebrate it, just celebrate it. Just do what you want. Just live. As simple as that. Also, in this occasion, I would like to express my gratitude to myself for being honoured to be the first to violate the imperations I created myself by saying Merry Christmas to y’all, if you really want, and Happy New Year, if you really need. And no, I am not inconsistent; I am just flexible.

dolar-latex dan kurungkotak-sourcecode di WordPress

Hmmm… ternyata WordPress bisa \LaTeX dan sourcecode.

Cari LaTeX
Cari code
di
http://support.wordpress.com/

e^{i \pi} = -1

int main () {
    return 0;
}

Nafsu! Gairah! Semangat! Hidup!

Lebaran

Here is a poem which is written in Python, concisely describing the situation of Lebaran in my domicile in an overly simplified manner.

def usual_day ():
    while hungry:
        eat()

def lebaran ():
    while there_is_food:
        eat()

Well, I’m sort of a programmer after all.

Dua Warta Gumbira

Hari ini, Kamis 17 September 2009, ada dua warta gumbira yang sangat menggumbirakan saya.

Pertama, GNU/Linux Debian ‘Lenny’ 5.0.3 berhasil diinstal di salah satu komputer di Ristek. Post ini dipost dari yang baru diinstal itu. Kita mulai mengganti jendela dengan pintu, eh, penguin. Diharapkan dengan datangnya benda yang lebih berkualitas ini walaupun terkadang melakukan blunder, produktivitas Ristek bisa meningkat. :-)

Kedua, saya udah punya nomor telepon `dia’ nih…
ha ha ha ha ha ha ha
sekasekasek.
Semakin dekat, semakin jauh…

Ihiy. :-D

Buku Catatan Arabophilus profundus Draf 1

Silakan pijit ini.

Gempa yang Kusyukuri

(Pada 2 September 2009 sekitar jam 3 sore WIB, gempa kecil terasa di Gedung C Fakultas Ilmu Komputer Universitas Indonesia, tempat saya berada saat itu. Gempanya tidak seberapa, tetapi entah bagaimana kejadian tersebut menjadi suatu ilham bagi saya untuk mengabadikannya dalam puisi berikut.)

Gempa kecil, tak bisa diremehkan
Kuturuni anak-anak tangga
Kututupi kepalaku
Wahai langit, janganlah engkau runtuh
Wahai bumi, janganlah engkau terbelah

Penghuni gedung cerai berai
berlomba turun keluar ruangan
berhamburan keluar bangunan
Harta benda ditinggalkan;
apalah artinya dibanding nyawa

Gempa berlalu
Langit dan bumi masih terpisah
Syukurlah

Akan tetapi, aku lebih bersyukur lagi
Di antara orang-orang, kulihat dia
hidup, berdiri, bertutur, tertawa, di depanku,
meskipun, amat sangat kusesalkan, tanpa diriku
karena aku terlalu pengecut;
bahkan berbasa-basi “Kau tak apa?” pun aku tak sanggup
Lelaki macam apa aku ini?

Terima kasih, Tuhan,
Sekali lagi Kau izinkan aku menatap dia
ciptaan-Mu yang halus, rapi, anggun, mempesona
Terima kasih

Andai Kau ciptakan dia untukku

Erik D.T.
Depok, Rabu 2 September 2009

Proses Registrasi Akademik dengan Penjadualan Semi-otomatik – Working Draft 1

Pemicu: http://rms46.blogspot.com/2009/08/logika-penjadwalan-kuliah.html.

WordPress tidak bisa mengupload file .tar.gz… argh! Untungnya dia masih bisa mengupload .pdf.

Terima kasih untuk kesabaran Anda.

MD5SUMS

db0c486ae416cacf1a23ffaa5878bf32  kertasputih.pdf
9494f4886032fcd85393edebd3ee6f44  ajaib.tar.gz

Yang mau baca PDF-nya saja silakan kertasputih.

Yang mau lihat source code-nya silakan:

Read More »