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Iskalni niz: "avtor" (Petra Grošelj) .

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1.
Vpliv mirnih con na načrtovanje letne sečnje in spravila lesa
Boštjan Kepic, Petra Grošelj, Janez Krč, 2016

Povzetek: 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.
Ključne besede: mirne cone, binarno celoštevilsko linearno programiranje, načrtovanje poseka lesa, gozdarstvo, gozdne proizvodnja, razmeščanje delovnih skupin
DiRROS - Objavljeno: 12.07.2017; Ogledov: 1237; Prenosov: 473
URL Celotno besedilo (0,00 KB)
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2.
Ranking strategic and operative goals for sustainable development of Pohorje, Slovenia
Petra Grošelj, Lidija Zadnik Stirn, Gregor Danev, Darij Krajčič, 2013

Povzetek: The combination of participatory process and multi-criteria decision methods have proven to be effective in supporting forest management decisions, since it offers inclusion of different opinions, views, and preferences of the problem. Our study is based on the results of the NATREG project, which deals with management of Pohorje, a mountain area in Slovenia. The results define six strategic goals and appertaining operative goals, which are the outcomes of workshops with different stakeholders. The aim of our study is ranking the strategic goals according to their contribution in the implementation of the "Pohorje 2030" vision and of the operative goals according to the appertaining strategic goals. Analytic hierarchy process is applied for comparisons of goals. Geometric mean method is employed for aggregating individual judgments into group judgment. The results show that all strategic goals are important, although most attention should be devoted to the goals "Preserved cultural heritage and local tradition" and "Environmental and consumer friendly usage of natural resources".
DiRROS - Objavljeno: 12.07.2017; Ogledov: 1200; Prenosov: 479
URL Celotno besedilo (0,00 KB)
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3.
Toward objective assessment of the conservation status of (the Natura 2000) forest habitat types : a comparison of a qualitative and a quantitative modeling approach
Marko Kovač, Petra Grošelj, 2018

Povzetek: To halt the loss of biodiversity in natural habitats, the EU passed the Habitats Directive and established the Natura 2000 network. The network captured forest habitats and habitat types, whose conservation status must be reported under Article 17 of the Directive. Hence, the harmonization of habitat assessment methods and reporting formats are a critical issue. So far, the EU Commission and Member States have managed to design and issue reporting guidelines. However, as many of these reports are largely based on expert opinions, they tend to be biased and incomparable. To make conservation status assessments and reporting more consistent, this study evaluated a set of indicators with two decision support models. The DEX model operated with linguistic statements derived from numerical values, while the fuzzy model utilized numeric input. Both models were tested with data from Slovenia's three largest forest habitat types (FHT), namely 9110 % Luzulo-Fagetum beech forests, 91K0 % Illyrian Fagus sylvatica forests (Aremonio-Fagion) and 91L0 % Illyrian oak-hornbeam forests (Erythronio-Carpinion), provided by the Forest and Forest Ecosystem Condition Survey. The DEX model produced uniform results and defined the conservation status of all three FHTs as least favorable. Conversely, the fuzzy model produced three different conservation status grades for the FHTs: a favorable conservation status for the 91K0 FHT, least favorable for the 9110 FHT and unfavorable for the 91L0 FHT. Its results were logical and in accord with the existing assessments. The study showed that both models could be used for the evaluation of FHT traits. However, because of its larger sensitivity, the fuzzy model allowed detecting subtle differences among the indicator values due to the use of continuous numerical data and more sophisticated mathematical procedures.
Ključne besede: biodiversity, decision-making models, dex, fuzzy logic, inference rules, forest habitats
DiRROS - Objavljeno: 20.02.2020; Ogledov: 147; Prenosov: 76
URL Celotno besedilo (0,00 KB)

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