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CUPRINS - Universitatea George Bacovia

CUPRINS - Universitatea George Bacovia

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Optimizarea sistematizării serviciilor prin modele de aşteptare−1sn2n 4n⎡s m2n n sn ⎛ ρ ⎞ ⎤ ⎡n ⎛ 1 ⎞ 2 n ⎛ 1 ⎞ ⎤P0 = ⎢∑Cmρ+ ∑ Am ⎜ ⎟ ⎥ = ⎢∑C4 ⎜ ⎟ + ∑ A4 ⎜ ⎟ ⎥ ≈ 0,682⎢⎣n= 0 s! n=s+1 ⎝ s ⎠ ⎥⎦⎢⎣n= 0 ⎝10⎠ 2! n=3 ⎝ 20 ⎠ ⎥⎦11 1P1 = CmρP0= C40,682 ≈ 0,273,10PP22≈2 2 2 ⎛ 1 ⎞= CmρP0= C4 ⎜ ⎟ 0,682 0,041,⎝10⎠3s2s 3 ⎛ ρ ⎞ 2 3 ⎛ 1 ⎞= Am ⎜ ⎟ P0= A4 ⎜ ⎟ 0,682 0,004 ,s! ⎝ s ⎠ 2! ⎝10⎠3≈s2s 4 ⎛ ρ ⎞ 2 4 ⎛ 1 ⎞P4 = Am ⎜ ⎟ P0= A4 ⎜ ⎟ 0,682 ≈ 0s! ⎝ s ⎠ 2! ⎝10⎠de unde numărul mediu de utilaje defecte la un moment dat este:4n = ∑ nP nn=04≈ 0⋅0,682+1⋅0,273+2⋅0.041+3⋅0,004=0,367.Atunci costurile pentru 2 mecanici suntΓ(2)=2⋅10+0,367⋅90=53,03 u.m./h.Prin urmare Γ(1)

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