DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 7-8/2017 str. 50     <-- 50 -->        PDF

                                                                                          (Eq. 13)
                                                                                          (Eq. 14)
                                                                                          (Eq. 15)
                                                                                          (Eq. 16)
                                                                                          (Eq. 17)
                                                                                          (Eq. 18)
                                                                                          (Eq. 19)
                         Tmp+Tap+Tft+Tsscc+Tmscc+Tsy-Time=0        (Eq. 20)
                                                                                          (Eq. 21)
                                                   " i                                  (Eq. 22)
                                                                                          (Eq. 23)
Where,
: Timber extraction system j to be applied in compartment i (man power, animal power, etc.)
: Income from compartment i using timber extraction system j (€)
: Costs in compartment i using timber extraction system j (€)
: The amount of timber loss from compartment i using timber extraction system j (m3)
: Required total time in compartment i using man power (hour)
: Required total time in compartment i using animal power (hour)
: Required total time in compartment i using skidder (hour)
: Required total time in compartment i using small size cable crane (hour)
: Required total time in compartment i using medium size cable crane (hour)
: Required total time in compartment i using sledge yarder (hour)
: Environmental damage in compartment i using timber extraction system j (hour) (ranges from 1 to 4)
Accounting variables:
        Total income (€)
         Total cost (€)
Profit:                                         Total profit (€)
        Total timber loss (m3)
        Total spent time (hour)
Tmp: Total spent time for man power (hour)
Tap: Total spent time for animal power (hour)
Tft:   Total spent time for skidder (hour)
Tsscc: Total spent time for small size cable crane (hour)
Tmscc: Total spent time for medium size cable crane (hour)
Tsy: Total spent time for sledge yarder (hour)
         Total damage factor
: Number of compartments (m=1 to 20)
: Timber extraction systems (n=1 to 6; 1=man power, 2=animal power, 3=skidder, 4=small size cable crane, 5=medium size cable crane, 6=sledge yarder)
Developing Alternative Operational Planning Strategies – Razvoj drugih strategija operativnog planiranja
A number of operational planning strategies were developed to examine the options or planning opportunities and to reflect the sensitivity of various constraints. Few reasonable ones were selected to test and understand changes toward a better solution (Table 3).
Among the three strategies, STR1 maximizes the net profit from timber production considering timber extraction systems at the end of the planning period. This strategy has no constraints in terms of time, damage or income level.