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User: dca

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Comments · 8

  1. Search quality is hard on Search Engines-Does Obscurity Prevent Exploitation? · · Score: 1

    Searching the web for the "right" page is an intrinsically hard problem, made tougher by users typing one-word queries and deception by website authors. Information Retrieval is an active area of research for a good reason. We all know computers are REALLY stupid, yet somehow we expect them to "do the right thing" when we ask for any concept under the sun. Counting links to a page is a useful heuristic, but it says nothing about the actual information content of the page itself. In fact, if you're looking for a really oddball datum, it may hurt. A lot.

  2. Give yourself credit on Overcomming Programmer's Block? · · Score: 1

    Give yourself some credit: you are probably not some lazy lowlife.
    There are easier ways to make a living than this. So what's the
    problem? I have no idea, but you do.

    There's obviously SOMETHING that's actively preventing you from
    focusing properly on the job at hand, and you probably know what it
    is. Not admitting that you have to deal with it just prevents you
    from going anywhere, so you're stuck. Lots of people have to do all
    their laundry before they get around to homework.

    You say you just got married? Congratulations! But I sincerely doubt
    that mention was a simple "by the way". The guy who said, "Get a
    Life" got it mostly right. Exercise gives you a chance to clear your
    mind of clutter and decide to do what you need to do. Whatever works.

    This may sound fuzzy or simplistic, but I won't presume to dictate HOW
    to solve your issue. All I can say is that you probably have one, and
    that is what's keeping you from coding. Only you can say what it is,
    and why you need to deal with it.

  3. Pure bandwidth on How Many Frequency Bands Are There? · · Score: 1

    As a theoretical question, you're talking about electro-magnetic
    radiation. The range of frequencies "available" range from 0 up
    through radio (10^10 Hz), microwave, visible light (10^15 Hz), X rays
    and gamma rays (10^22 Hz) I don't think there's an upper bound,
    although generating them starts to take a LOT of energy.

    As a term, "bandwidth" measures the rate at which you can communicate
    information. It is a measure of the range of frequencies you use to
    transmit the information (highest minus lowest). The bit rate is more
    or less equivalent to the width (in Hertz) of that frequency band.

    So using all of visible light, for instance, like fiber-optic DWDM is
    heading towards, gives:

    7.5 x 10^14 for violet
    4.2 x 10^14 Hz for red

    3.3 x 10^14 Hz of bandwidth, or in the hundreds-of-terabits/sec range.

    (Let's ignore polarizing the light for now, shall we?)

    But so what, that's theory. You care about how usable it is, with
    issues like how much it disperses and how well it penetrates air,
    clouds, trees and skyscrapers. The higher the frequency, the more it
    behaves like photons and less like waves. Microwaves are pretty
    "beamy", which makes them good for point-to-point links. Ozone
    effectively blocks out everything above near-UV, so using x-rays to
    communicate with satellites is out.

    I'm sure others are pointing out the free-air EM-spectrum
    transmissivity charts and such.

    -dca

  4. Encryption's long and honorable history on Information On Cryptography And Effects On Society? · · Score: 2

    From http://www.americanpartisan.com/cols/mcelroy/10239 9.htm<P>

    In 1785, a resolution authorized the secretary of the Department of
    Foreign Affairs to open and inspect any mail that related to the
    safety and interests of the United States. The ensuing 'inspections'
    caused prominent men, like George Washington, to complain of mail
    tampering. According to various historians, it led James Madison,
    Thomas Jefferson and James Monroe to write to each other in code -
    that is, they encrypted their letters - in order to preserve the
    privacy of their political discussion.

  5. jppeg.c uilds for me on Free Realtime Video Editing for Linux · · Score: 1

    ./gfx/jpeg-6b/jpeglib.h:typedef struct jpeg_marker_struct FAR * jpeg_saved_marker_ptr;

    ./gfx/jpeg-6b/jpeglib.h:struct jpeg_marker_struct { ...


    That one at least isn't a problem. But since I'm
    stuck at libc5 I can't install nasm and it fails
    a little later.

    The author may be guilty of a little sloppiness, but hey if it works it can be cleaned up. It's got critical mass, and that's what counts.

  6. Household banking vs. investing on What's the Best Online Financial Solution? · · Score: 2
    You're asking two different questions. One is about banking
    in the traditional sense of running your household finances on a
    monthly basis. The other is about investing, which is what
    you do with the money that isn't going "in one hand and out the
    other." There are any number of places to run your checkbook from as
    noted above, but I sincerely hope you don't expect that to address
    your IPO-scale cash.


    Once you clear about $100k you start becoming interesting to the
    investment community for real. And you start really needing
    professional services. Below $50k investable you'll be paying a lot
    for any real customized services you get; above $250k you can get a
    team of people working for you for less than you'd pay a mutual fund
    in management fees.


    We all see the results of people dabbling in technical fields when
    they aren't really professionals in it. It would have been cheaper to
    have hired a pro from the start. It's the same with money. There are
    a lot of smart people in the money management business, and many of
    them have a lot more experience in their field than you (or I) do in
    ours. Why would you want to roll your own with something so precious?


    My opinion is that "best online banking solution" is an oxymoron for
    real investments by people who are not full-time financial
    professionals. It may be fine for cookie-cutter household finances
    like bill-paying and downloading your statement into a spreadsheet,
    but investing is a customized service industry.


    That said, you can check out ICFP
    for independents. Merrill Lynch
    offers a Cash Management Account (CMA) that rolls up the household
    checking, credit card, and a team of people into one package. Their
    quoted rates are a maximum; it declines the more money you have with
    them.

  7. Not yet on BladeEnc 0.80 released under the LGPL · · Score: 1

    I asked. He said he's not currently interested
    in donations, at least until the whole matter is
    settled. He'll put up the final $US number when
    there is one, meantime keep thinking good thoughts.

  8. Have a mirror but no trailer? on Star Wars Trailer #2 · · Score: 1

    Or maybe you were (or are about to be) lucky enough to actually get a copy, but don't have any place to serve it up for the masses. Here's a suggestion to put tab A in slot B:

    If you get a copy but don't have a site, announce that fact here, along with an offer to anon-ftp it TO anybody's server that's willing to serve it up free. Once you give away a copy, announce that place.

    If you have a server, watch for an announcement, and send mail to the first person you see that makes the above offer, giving server details.