Rudarski radovi br 4 2011 - Institut za rudarstvo i metalurgiju Bor
Rudarski radovi br 4 2011 - Institut za rudarstvo i metalurgiju Bor
Rudarski radovi br 4 2011 - Institut za rudarstvo i metalurgiju Bor
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Poka<strong>za</strong>ni postupak <strong>za</strong>tim analogno<<strong>br</strong> />
primenjujemo na sve aktivnosti uvažavajući<<strong>br</strong> />
strukturu (slika 3.) datog mrežnog<<strong>br</strong> />
plana. Na taj način dolazimo do predposlednje<<strong>br</strong> />
i poslednje aktivnosti datog<<strong>br</strong> />
mrežnog plana koje se proračunavaju:<<strong>br</strong> />
⎡ ⎤<<strong>br</strong> />
⎢ ⎥<<strong>br</strong> />
Rz29 = max ⎢Rz27+ t29; Rz28+ t29; Rz26+ t29⎥<<strong>br</strong> />
⎢ ⎥<<strong>br</strong> />
⎣ ⎦<<strong>br</strong> />
27+ 29 = [ 17 + 57;92 − 18 ] +<<strong>br</strong> />
[ α 2; 4 α] [ 18α 59;96 19α]<<strong>br</strong> />
Rz t α α<<strong>br</strong> />
+ + − = + −<<strong>br</strong> />
28+ 29 = [ 19 + 61;99 − 19 ] +<<strong>br</strong> />
[ α 2;4 α] [ 20α 63;103 20α]<<strong>br</strong> />
Rz t α α<<strong>br</strong> />
+ + − = + −<<strong>br</strong> />
26+ 29 = [ 18 + 63;98 − 17 ] +<<strong>br</strong> />
[ α 2;4 α] [ 19α 65;102 18α]<<strong>br</strong> />
Rz t α α<<strong>br</strong> />
+ + − = + −<<strong>br</strong> />
59 + 2 ⋅ 77 + 96<<strong>br</strong> />
RRz ( 27+ t29)<<strong>br</strong> />
= = 77,25<<strong>br</strong> />
4<<strong>br</strong> />
63 + 2 ⋅ 83 + 103<<strong>br</strong> />
RRz ( 28+ t29)<<strong>br</strong> />
= = 83,0<<strong>br</strong> />
4<<strong>br</strong> />
65 + 2 ⋅ 84 + 102<<strong>br</strong> />
RRz ( 26+ t29)<<strong>br</strong> />
= = 83,75<<strong>br</strong> />
4<<strong>br</strong> />
[ ]<<strong>br</strong> />
Rz29 = 19α + 65;102 − 18α<<strong>br</strong> />
Rz30 = Rz29+ t30<<strong>br</strong> />
30 = [ 19 + 65;102 − 18 ] +<<strong>br</strong> />
[ 2α 8;12 2α] [ 21α 73;114 20α]<<strong>br</strong> />
Rz α α<<strong>br</strong> />
+ + − = + −<<strong>br</strong> />
[ ]<<strong>br</strong> />
Rz30 = 21α + 73;114 − 20α<<strong>br</strong> />
Fuzzy <strong>br</strong>oj koji prestavlja poslednju<<strong>br</strong> />
aktivnost projekta Rz30 definiše nam<<strong>br</strong> />
funkciju mogućnosti <strong>za</strong>vršetka projekta. U<<strong>br</strong> />
prethodnom izrazu je fuzzy <strong>br</strong>oj koji<<strong>br</strong> />
prestavlja poslednju aktivnost definisan<<strong>br</strong> />
preko svojih α preseka.<<strong>br</strong> />
Analitički oblik funkcije mogućnosti<<strong>br</strong> />
dobijamo na sledeći način:<<strong>br</strong> />
−<<strong>br</strong> />
R z30<<strong>br</strong> />
= L xR<<strong>br</strong> />
α<<strong>br</strong> />
α<<strong>br</strong> />
α x − 73<<strong>br</strong> />
x = 21α<<strong>br</strong> />
+ 73 → α = L<<strong>br</strong> />
L<<strong>br</strong> />
21<<strong>br</strong> />
[ α α<<strong>br</strong> />
x , ] = [ 21α<<strong>br</strong> />
+ 73,<<strong>br</strong> />
114 − 20 ]<<strong>br</strong> />
114 α<<strong>br</strong> />
α − x<<strong>br</strong> />
x 114 20α<<strong>br</strong> />
α<<strong>br</strong> />
D<<strong>br</strong> />
D = + → =<<strong>br</strong> />
20<<strong>br</strong> />
Odakle dobijamo analitički izraz <strong>za</strong><<strong>br</strong> />
funkciju mogućnosti:<<strong>br</strong> />
()<<strong>br</strong> />
[ ] ⎪<<strong>br</strong> />
⎪ ⎪<<strong>br</strong> />
⎧ t − 73<<strong>br</strong> />
⎫<<strong>br</strong> />
⎪<<strong>br</strong> />
= 0,<<strong>br</strong> />
0476t<<strong>br</strong> />
− 3,<<strong>br</strong> />
4762,<<strong>br</strong> />
73 ≤ t ≤ 94<<strong>br</strong> />
21<<strong>br</strong> />
⎪<<strong>br</strong> />
⎪114<<strong>br</strong> />
− t<<strong>br</strong> />
⎪<<strong>br</strong> />
π t = ⎨ = 5,<<strong>br</strong> />
7 − 0,<<strong>br</strong> />
05t,<<strong>br</strong> />
94 ≤ t ≤ 114⎬<<strong>br</strong> />
⎪ 20<<strong>br</strong> />
⎪ 0,<<strong>br</strong> />
t ∉ 73,<<strong>br</strong> />
114<<strong>br</strong> />
⎪⎩<<strong>br</strong> />
⎭<<strong>br</strong> />
Grafička prestava ovog izra<strong>za</strong> data je na<<strong>br</strong> />
slici 4.<<strong>br</strong> />
Razlika u proračunu između proračuna<<strong>br</strong> />
<strong>za</strong> različite konkretne vrednosti α i proračuna<<strong>br</strong> />
gde se α javlja kao parametar javila<<strong>br</strong> />
se samo kod računjanja ranog <strong>za</strong>vršetka<<strong>br</strong> />
Rz29. (kod upoređenja Hamingove distance<<strong>br</strong> />
<strong>za</strong>: Rz28+ t29<<strong>br</strong> />
i Rz26+ t29).<<strong>br</strong> />
Zbog toga se javila neznatna razlika<<strong>br</strong> />
kod <strong>za</strong>vršetka projekta.<<strong>br</strong> />
Sličan proračun bi se izveo i <strong>za</strong> proračun<<strong>br</strong> />
kasnog <strong>za</strong>vršetka pojedinih aktivnosti, kod<<strong>br</strong> />
proračuna vremenske rezerve, itd.<<strong>br</strong> />
Sl. 4. Prikaz funkcije mogućnosti π(t)<<strong>br</strong> />
Završetak projekta dobijen preko α preseka<<strong>br</strong> />
gde nisu <strong>za</strong>menjivane konkretne vrednosti<<strong>br</strong> />
Autori ovog rada su <strong>za</strong> dati primer<<strong>br</strong> />
odredili vreme reali<strong>za</strong>cije projekta i probabilističko-posibilističkim<<strong>br</strong> />
postupkom prema<<strong>br</strong> />
[1]. Razlika jednog i drugog proračuna sastoji<<strong>br</strong> />
se u tome što je primenom metode <strong>za</strong><<strong>br</strong> />
poređenje fuzzy <strong>br</strong>ojeva potrebno proračunati<<strong>br</strong> />
mrežni plan samo jednom, nakon čega<<strong>br</strong> />
Broj 4,<strong>2011</strong>. 155<<strong>br</strong> />
RUDARSKI RADOVI