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B3 勉強会 第4回目 ( 2015年2月5日(火) )

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February 05, 2015
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B3 勉強会 第4回目 ( 2015年2月5日(火) )

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yoshii25

February 05, 2015

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Transcript

  1. B3ษڧձ ୈ4ճ(2015/2/5) ௕Ԭٕज़Պֶେֶ ࣗવݴޠॲཧݚڀࣨ B3 ழມ ܚथ 1

  2. TF๏, IDF๏ • TF๏ wtd = tf(t,d) • จষதͰͷग़ݱස౓͕ߴ͍୯ޠ΄Ͳॏཁͳ୯ޠͰ͋Δ. •

    IDF๏ idf(t)=log —— +1 • ෳ਺ͷจষͰ࢖ΘΕ͍ͯΔ୯ޠ͸ͦΕ΄ͲॏཁͰ͸ͳ͍. 2 N df(t)

  3. ࠶ݱ཰, ਫ਼౓, F஋ • ৘ใݕࡧγεςϜͷධՁ • ৘ใݕࡧγεςϜͷੑೳ͸, ࠶ݱ཰, ਫ਼౓ͷ̎ͭͷධՁई౓Λ༻ ͍ͯධՁ͞ΕΔ͜ͱ͕ଟ͍.

    ·ͨ, ૯߹తͳੑೳΛࣔ͢ࢦඪͱ͠ ͯF஋͕Α͘༻͍ΒΕΔ. 3

  4. ࠶ݱ཰, ਫ਼౓, F஋ • ৘ใݕࡧγεςϜͷධՁ 4 ࠶ݱ཰(R) = ——— A

    A+B ਫ਼౓(P) = ——— A A+C F஋ = ————— 2×P×R P+R A C B ςΩετू߹શମ ݕࡧςΩετू߹ ਖ਼ղςΩετू߹