Updates from March, 2009 Toggle Comment Threads | Keyboard Shortcuts

  • CG 9:40 pm on March 31, 2009 Permalink | Reply
    Tags: ,   

    Teaching: always learn something new 

    Luckily had been offered to give a short session (again) in this class today. I become more aware that, explaining things that I think and learn everyday, is not always easy.

    Then it needs extra effort to deliver things that are clear in my head, transform it into simple blocks of ideas and then convert it to some understandable sequence of words.

    Simplify things. Use short keywords. Give example.

    [Image taken from http://www.icalweb.com/wiki/images/a/a7/Cartoon.jpg%5D

    • Budi Rahardjo 11:03 pm on March 31, 2009 Permalink | Reply

      That’s the fun part of teaching (and the most difficult one); trying to make complicated things easier to understand. Sometimes we have to do try many times before getting it “right”.
      And when you get it right (and the students / audience understand), it just feels so good.

      Keep up the good work!

    • CG 11:13 pm on March 31, 2009 Permalink | Reply

      BR: it’s an honor to teach in your class, sir 🙂

  • CG 6:57 pm on March 25, 2009 Permalink | Reply  

    How to write multiple author in Lyx 

    Insert Tex code with author style:


    And then you’ll get this:


    Notes: for IEEE format, author with more than one line will be displayed in two columns. This is the trick how to keep those multiple lines in the center, below the title.

    More example here

  • CG 7:33 am on March 8, 2009 Permalink | Reply
    Tags: non-supersingular curve   

    Non-supersingular curve 

    As a part of brain exercise, I’m spending times on weekend doing calculations for a non-supersingular curve over F_2^4 with f(z)=z^4+z+1 and E : y^2+xy=x^3+z^3x^2+(z^3+1) .

    To determine points in the curve, I have to solve quadratic equations for that elliptic curve. Rosing said that the variable has to be changed to eliminate x .

    Let y = xz

    and that gives (xz)^2+x^2z+f(x)=0

    By multiplying the entire equation by x^{-2} , then the equation will be:



    c= f(x).x^{-2} .

    z^2+z+c will only has solution when the Trace of c is 0.

    Hmmm, I have done calculation for simpler E equation, never for this kind of equation. Well, most of the times, calculating math in numbers is not that simple! I mean, there are definitions and equations, and looking at them make you think that you already understand them. But when you try to apply them using numbers, then it is another hard work to do 😀

    • tetanga sebelah 8:41 am on March 22, 2009 Permalink | Reply

      jadi gimana mau selesai gak nih, gelarnya mau Phd atau Npd? sepertinya nama blog nya ada yang salah, masa the code girl, harus nya the code woman atau chik-int

    • tetanga sebelah 3:44 pm on March 22, 2009 Permalink | Reply

      mau bantuin nulis blog di sini gak http://kotakpintar.wordpress.com/

  • CG 9:38 pm on March 7, 2009 Permalink | Reply
    Tags: , , groups   

    Groups, fields, finite fields, zzzzz… 

    I’m admiring mathematicians for the consistency, strictness and clarity in defining and extracting patterns into definitions and theorems.

    The good thing about math is to learn about discipline and consistency, and I’m still working hard on digesting those symbols that appear so similar yet define totally different thing.

    I always get confused when I ask myself what’s the difference between Z_{p} , F_{p} and F_{p^m} and GF(p^m) .

    Here’s the definitions, thank God I finally found this, from the same book:


    There are also F_{q} and F_{q}^* . Uffhhh, it’s amazing how one symbol could represent so many things…

    • yuti 9:12 pm on March 22, 2009 Permalink | Reply

      the first time I entered those subject was by learning to read 🙂

  • CG 4:26 pm on March 7, 2009 Permalink | Reply  

    Groups: additive and multiplicative 

    Another definitions to add more understanding of the previous posting.


    Taken from here.

  • CG 7:45 am on March 7, 2009 Permalink | Reply
    Tags: multiplicative group,   

    Re-explore the definitions 

    Before the bug invasion, the phd student was in the middle of serious activities of writing the technical paper while scribbling on her book about some math definitions she forgot along the way she explored the engineering side of her research.

    She had a big headache about why does multiplicative group defined in this book:
    doesn’t include zero?

    …before she finally found this example:

    Writing technical report make her re-explore of those math symbols and definitions and thus contributes to her better dan deeper understanding about the subject. Which is great.

    Still many pages to write… full of numbers and equations.

  • CG 3:45 pm on March 4, 2009 Permalink | Reply
    Tags: ideas   

    Random ideas 

    Got some random ideas after some discussions at regular phd meeting today. I’m now thinking about:

    1. What is the impact of over exposure of data/information in the network?
    2. Is it possible to develop public opinion about somone over a massive data collected in the internet?
    3. How to camouflage data? Is it possible to convert data so it will be recognized as “non-data”?

    [Image taken from http://farm3.static.flickr.com/2232/1974061978_e3dbb3f486.jpg?v=0%5D

    • Budi Rahardjo 8:23 pm on March 5, 2009 Permalink | Reply

      My answer to Q1. What do you mean by “impact”? It has different meanings. For example, if we talk about networking then the impact could be increase in network usage (which is happening). Or, are you talking about something else?

      A-to-Q2: yes it is possible. You know what, I was thinking of rolling my own applications to do something similar to that 🙂 [Of course, I would do it in perl. ha ha ha.] Given current technologies, such as RSS, it should be doable. I am not saying it would be easy, but it is doable. [I’ve done part of it a long time ago, say > 10 years ago!]

      A-to-Q3: yes, it is possible. Steganography comes into mind.

    • CG 5:43 am on March 6, 2009 Permalink | Reply

      1. the context is more about social networks. like facebook, where people uploading they stuff and some people misuse it. i’m thinking about how to keep our data private? and for cloud computing, how to make sure that our data is not being exposed?

      2. really? your own application? cool! [in perl, this i don’t believe :)) ]
      using RSS? you mean by extracting the content of status update like twitter, plurk or fb?
      how to verify those data. i mean, how do you know that some data is really submitted by the person? what’s the algorithm to, let’s say, gather information about my personality, from the internet?

      3. Yes, i’ve been thinking about steganography as well. but can you give my some example that it can be done, like how would you store your data in your harddrive, but nobody would notice it as a data? changing it’s extension? hide it? any other way? how would you do it accross the networks?

  • CG 9:53 am on March 4, 2009 Permalink | Reply

    Status update 

    Just reporting that the phd students is still alive, and luckily have had successfully left her comfortable zone. She’s more asocial, yes. She blogs less, yes. She reads more, yes. She writes more, yes. A long long long paper full of math equations. She now likes to isolate herself in her new hiding places. Yea, places. She likes moving from one place to another. One place is too boring.

    She keeps aside stuff about basis translation for now, since she had already a long discussion with her best mathematician wizard bestfriend, and the wizard promised to help her on that, so the phd student may forget about that for a while and concentrating on writing the long paper.

    As long as the essential supplies for supporting her life is provided, so she will still continue living.

    [Image taken from: http://alec-longstreth.com/writing/2006/BasewoodRobot.jpg%5D

    • soni 12:55 pm on March 4, 2009 Permalink | Reply

      gambarnya bikin gatel pengen comment 😀

    • Budi Rahardjo 8:26 pm on March 5, 2009 Permalink | Reply

      delivering ink, music, air, water, food, sleep, …

    • CG 5:33 am on March 6, 2009 Permalink | Reply

      @soni: apa, karna ada robotnya? wordpress situ malah skarang isinya kriptografi, gimana sih???

      @BR: a a a a a a a a a, t h a n k y o u ! 🙂 [big big smile from ear to ear]

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