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Title:Vpliv mirnih con na načrtovanje letne sečnje in spravila lesa
Authors:Kepic, Boštjan (Author)
Grošelj, Petra (Author)
Krč, Janez (Author)
Language:Slovenian
Tipology:1.01 - Original Scientific Article
Organisation:LogoSciVie - Slovenian Forestry Institute
Abstract:Prispevek obravnava vpliv mirnih con na načrtovanje letne izvedbe pridobivanja lesa (fazi sečnje in spravila lesa). Izdelali smo dva modela binarnega celoštevilskega linearnega programiranja (BILP) za razmeščanje delovnih skupin v oddelke glede na najmanjše skupne stroške. Ti vključujejo stroške sečnje in spravila lesa, potne stroške in stroške premikov strojev. V prvem modelu smo predpostavili, da je čas proizvodnje poljuben. V drugem modelu pa, da je v 50 % oddelkov proizvodnja časovno omejena zaradi mirnih con in razpoložljivi letni delovni čas zmanjšan za 16,9 %. Ugotovili smo, da je zaradi časovnih omejitev letno izvedbo pridobivanja lesa možno opraviti le z uvedbo dodatne delovne skupine. Časovne omejitve vplivajo na razmeščanje delovnih skupin v oddelke ter na vrstni red opravljanja del. Povečane skupne stroške letne gozdne proizvodnje zaradi mirnih con je možno opravičiti z nezmožnostjo poseka lesa, povečanimi stroški delovne sile in višjimi stroški amortizacije za mehanizacijo. Problem izpada delovnega časa zaradi mirnih con lahko podjetje rešuje s prerazporeditvijo svojih delavcev na druga dela. Problem izpada izvedbe sečnje in spravila, ki nastopi zaradi mirnih con in posledično kasnejšo potrebo po višjih zmogljivostih, pa lahko podjetje rešuje s podizvajalci. Vsak model smo testirali na dveh primerih.
Keywords:mirne cone, binarno celoštevilsko linearno programiranje, načrtovanje poseka lesa, gozdarstvo, gozdne proizvodnja, razmeščanje delovnih skupin
Year of publishing:2016
COBISS_ID:4676262 Link is opened in a new window
UDC:630*3(045)=163.6
ISSN on article:2335-3112
OceCobissID:266761216 Link is opened in a new window
DOI:10.20315/ASetL.109.2 Link is opened in a new window
Views:986
Downloads:237
Files:URL http://eprints.gozdis.si/2063/
.pdf asetl-109-2.pdf (976,53 KB)
 
Journal:Acta silvae et ligni
Gozdarski inštitut Slovenije, založba Silvae Slovenica
 
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Secondary language

Language:English
Title:The impact of disturbance-free areas on annual harvest operations planning
Abstract:The article deals with annual harvest operations (AHO) planning with consideration of disturbance-free areas. We developed two models of binary integer linear programming (BILP) for scheduling work groups to harvest unit areas (HUA) according to the lowest possible cost. Total AHO costs include: harvesting and skidding costs, transportation costs, and machine relocation costs. First model is based on the presumption that harvesting can be planned and executed freely throughout the year. In the second model, scheduling was subject to time restrictions due to disturbance-free areas. 50% of the HUA had time restrictions which led to 16.9% reduction of annual workplace time. In this case, by introducing an extra work group, we can provide for the implementation of the AHO plan. Furthermore, we state that in this situation time restrictions affect the scheduling of work groups and the sequencing of tasks. The increase in total AHO costs can be explained by decreased wood harvesting capacity, increased production costs and higher amortization costs of machines. Available workplace time shortage due to time restrictions can be dealt with by shifting own workers to other tasks. The workforce deficits can be compensated by recruiting subcontractors. We have tested each model on two examples.
Keywords:disturbance-free areas, binary integer programming, forestry, annual harvest operations planning, scheduling working teams, harvesting


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