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turbohedgehog's comments

turbohedgehog | 9 years ago | on: Cheating on a string theory exam

The table basically says it's possible to pick a set of 4096 (2^12) different vectors of T/F combinations in a way that you only need flip up to 3 (R=3) of the T/F answers to cover all 2^23 (n=23) possible solutions to the quiz. Thus you only need 68 minutes and 16 seconds (4096 seconds) in order to guarantee you get at least 20 answers correct.

You can use the remaining 1304 seconds to encode some more vectors to increase the possibility of getting more answers correct, but you cannot guarantee 21 or more correct answers in the allotted time. The lower & upper bound (not sure what this part means) for n=23,R=2 is 30686-32768 about 9 hours!

Very simple example with n=3. I have listed all the vectors with Hamming distance of 1 or less (R=1). Looking at the table, we see that for n=3, R=1, we can cover all the vectors with 2 different codes. Heads and tails for example. It's easy to see which combinations we can pick to guarantee coverage, a&h, b&g, c&f, d&e. Using any of those combinations and some way to signal to the other person 'heads' or 'tails' will guarantee they get at least 2 answers correct.

  a TTT <= TTT TTF TFT FTT
  b TTF <= TTT TTF         TFF FTF     
  c TFT <= TTT     TFT     TFF     FFT 
  d FTT <= TTT         FTT     FTF FFT
  e TFF <=     TTF TFT     TFF         FFF
  f FTF <=     TTF     FTT     FTF     FFF
  g FFT <=         TFT FTT         FFT FFF
  h FFF <=                 TFF FTF FFT FFF

turbohedgehog | 9 years ago | on: ICANN has taken my site hostage

Honestly I'd blame Namecheap, not ICANN. My registrar was much more relaxed - I did not need to take any action

Please take a moment to view the WHOIS listing for each of the domain names you currently have registered through us. Please verify your mailing address, email address, and the administrative and technical contacts assigned to each domain name are correct. If your WHOIS information has changed or is inaccurate please log into your account manager and update accordingly. If your WHOIS information is correct, you do not need to take any action.

turbohedgehog | 9 years ago | on: Simple Wi-Fi Yagi (2014)

FCC regulations (afaik) only apply to the power output of the device, modifying the antenna like this shouldn't change the power output.

turbohedgehog | 9 years ago | on: Tom Wheeler Resigns from the FCC

Incorrect. FCC commissioners serve a term and Wheeler's term was up June 30, 2018, so this is an early resignation and opens up a spot for Obama or Trump to fill.
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