Lidija Zadnik Stirn
University of Ljubljana
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Publication
Featured researches published by Lidija Zadnik Stirn.
European Journal of Operational Research | 2012
Petra Grošelj; Lidija Zadnik Stirn
The analytic hierarchy process is a method for solving multiple criteria decision problems, as well as group decision making. The weighted geometric mean method is appropriate when aggregation of individual judgements is used. This paper presents a new proof which confirms the property that if the comparison matrices of all decision makers are of acceptable consistency, then the weighted geometric mean complex judgement matrix (WGMCJM) also is of acceptable consistency. This property was presented and first proved by Xu (2000), but Lin et al. (2008) rejected the proof. We also discuss under what conditions the WGMCJM is of acceptable consistency when not all comparison matrices of decision makers are of acceptable consistency. For this case we determine the sufficient condition for the WGMCJM to be of acceptable consistency and provide numerical examples. For a special case of two decision makers with 3×3 comparison matrices we find out some additional conditions for the WGMCJM to be of acceptable consistency.
Expert Systems With Applications | 2015
Petra Grošelj; Lidija Zadnik Stirn; Nadir Ayrilmis; Manja Kitek Kuzman
We presented and employed seven simple group AHP aggregation techniques.The LW-AHP model was a well evaluated group AHP method.For non-homogenous group we suggest to divide the group in smaller homogenous groups.One of our new group methods, the WGM-WAM or the WGM-LW-AHP can be employed. Group decision making is an important part of multiple criteria decision making and the analytic hierarchy process (AHP). The aim of this paper was to compare group AHP methods. Seven simple group AHP aggregation techniques that could be attractive for applications selected from the vast array of group AHP models proposed in the literature were selected for evaluation. We developed three new measures of evaluation: group Euclidean distance, group minimum violations, and distance between weights for the purpose of evaluation. The results of seven group AHP methods of the theoretical example were evaluated by three new evaluation measures, satisfactory index and fitting performance index. Furthermore, a case study of a decision making problem from the construction engineering field was performed and nine group AHP aggregation techniques, seven of them formerly presented and two new two stage group approaches were applied. Finally, the case study was evaluated using all five measures for each of the nine group decision making methods. The results showed that not all group AHP methods are equally convenient and that the selection of the method depended on the specific application.
Journal of Decision Systems | 2018
Petra Grošelj; Lidija Zadnik Stirn
Abstract The paper discusses fuzzy group analytic hierarchy process. In the literature, there are found several approaches for determining weights either directly from the individual judgments or via group comparison matrix. However, the quality of the group weights was not studied yet. In the paper, we propose two new measures for the evaluation of the group weights that are adapted from classical analytic hierarchy process. We selected six approaches for deriving weights and use them in an application from the literature. We evaluated the gained weights. Our results show that the weights derived by the most popular extent analysis method are questionable in their reliability.
Drvna Industrija | 2016
Branko Liker; Lidija Zadnik Stirn; Dominika Gornik Bučar; Jasna Hrovatin
The aim of this research was to determine the relative importance of three factors relevant for buying wooden kitchen furniture in Croatia and Slovenia. A survey was made of 172 potential kitchen buyers: 138 in person at two largest furniture stores in Croatia and Slovenia, and 34 online. A conjoint analysis revealed that respondents were more concerned about the manufacturer and design than the price of the kitchen furniture. For all demographic groups, the lower price kitchen furniture was preferable. Only three demographic groups (3545 years of age, elementary school or less, and unemployed) preferred the classic kitchen furniture design, while all other groups preferred the modern design. For the manufacturer, differences were found among most sociodemographic categories.
Business Systems Research | 2016
Ksenija Dumičić; Lidija Zadnik Stirn; Janez Žerovnik
Abstract Background Determining the location, boundaries and areas of land properties accurately in the land cadastre is essential. The named data are provided using coordinates, acquired from field measurements. Since 2008, the Slovenian land cadastre claims positioning in the national realization of the ETRS89, so the GNSS use is practically indispensable. Objectives: Contrary to real-time, we can change parameters in GNSS post-processing. The aim of this paper is to simulate different measurement conditions for GNSS in order to determine how to acquire the best possible coordinates for further use in land area calculation. Methods/Approach: Simulations of obstacles near points followed the increasing of the cut-off angle. Furthermore, shortening the observation interval resulted in different occupation duration. The final condition evaluation for coordinate quality acquisition followed from fuzzy logic. Results: The results show that for short baselines, occupation duration is the most important factor in acquiring high quality coordinates and avoiding the multipath. Differences in coordinates from specific strategies can sometimes exceed the tolerance and evidently affect the area calculation. Conclusions: The findings confirm that only good measurement conditions lead to high quality coordinates and well-defined areas of land properties, which are the fundamental factor in relation to the issues of property valuation and assessing land taxes or rents.
A Quarterly Journal of Operations Research | 2003
Lidija Zadnik Stirn
Ecological issues with demands for preserving the nature and multipurpose use of land have, along with existing economic criteria, become a key part of the modem concept of ecosystem management. Therefore, on one hand, the land owners and experts are faced with the land use decisions which maximize the profit and refer to ecological objectives, while on the other hand, the public, who benefits from the amenity value of the ecosystem, specifically derives its own scenario of decisions. As such, an ecosystem management problem is a satisfactory attainment of multiple, but conflicting, objectives (Zadnik 200 I, 2002).
Archive | 1994
Lidija Zadnik Stirn
In the forest the silvicultural and utilization process is carried out by performing a sequence of decisions, like the felling and the planting of the trees. Within these practices the forest product is yielded. The amount of the yield should stay at an approximately fixed annual level. This could be realized by so-called “normal forest”. Moreover, living and growing of the trees are affected by unpredictable natural circumstances. Therefore, the forest as a system contains both, the decision making and the probabilistic features. Stochastic dynamic models are very appropriate for providing the optimal forest management decisions maximizing the sustained timber production and net revenues to the society (Hool (1966), Lembersky et al. (1975), Binkley (1980), Kao (1982), Kaya et al. (1987), Hassler et al. (1988)).
Archive | 1992
Lidija Zadnik Stirn
The optimization problem presented in this paper arises from the problem of forest management. Forest is a very complicated renewable natural resource. It has to be managed with pre-described economic and environmental demands considering the given natural circumstances. The management of the forest involves sequences of relatively similar decisions which have a profound effect on current status of the forest as well as on the future forest conditions and they should be chosen with the aim to maximize the sum of returns. Methods of operations research and optimization models can be used as means to find a set of strategies which result in considerably improved decision making in forest management.
Journal of Food Engineering | 2008
Ana Osvald; Lidija Zadnik Stirn
Ecological Modelling | 2006
Lidija Zadnik Stirn