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1

Use of Constraints in the Hierarchical Aggregation Procedure Intramax

100%
Drobne S., Lakner M.
Business Systems Research Journal
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2016
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vol. 7
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issue 2
5-22
EN
Background: Intramax is a hierarchical aggregation procedure for dealing with the multi-level specification problem and with the association issue of data set reduction, but it was used as a functional regionalization procedure many times in the past. Objectives: In this paper, we analyse the simultaneous use of three different constraints in the original Intramax procedure, i.e. the contiguity constraint, the higher-inner-flows constraint, and the lower-variation-of-inner-flows constraint. Methods/Approach: The inclusion of constraints in the Intramax procedure was analysed by a programme code developed in Mathematica 10.3 by the processing time, by intra-regional shares of total flows, by self-containment indexes, by numbers of singleton and isolated regions, by the number of aggregation steps where a combination of constraints was applied, by the number of searching steps until the combination of constraints was satisfied, and by surveying the results geographically. Results: The use of the contiguity constraint is important only at the beginning of the aggregation procedure; the higher-inner-flows constraint gives singleton regions, and the lower-variation constraint forces the biggest employment centre as an isolated region up to a relatively high level of aggregation. Conclusions: The original Intramax procedure (without the inclusion of any constraint) gives the most balanced and operative hierarchical sets of functional regions without any singletons or isolated regions.
2

Behavioural Present Value Defined as Fuzzy Number – a New Approach

100%
Piasecki K., Siwek J.
Folia Oeconomica Stetinensia
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2015
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vol. 15
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issue 2
27-41
EN
The behavioural present value is defined as a fuzzy number assessed under the impact of chosen behavioural factors. The first formal model turned out to be burdened with some formal defects which are finally corrected in the presented article. In this way a new modified formal model of a behavioural present value is obtained. New model of the behavioural present value is used to explain the phenomenon of market equilibrium on the efficient financial market remaining in the state of financial imbalance. These considerations are illustrated by means of extensive numerical case study.
3

Application of Multi-Criteria Analysis in the Public Procurement Process Optimization

100%
Mimović P., Krstić A.
Economic Themes
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2016
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vol. 54
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issue 1
103-128
EN
One of the key steps in the implementation of a public procurement process is the criteria selection that are associated with the bidders, which are intended to ensure that bidders will be able to meet the requirements from the contract. Implicitly, the criteria selection includes their evaluation in situations when the criterion of the lowest price is not applied, but instead the criterion of the most economically advantageous tender. The aim of the paper is to show that decision-makers in the public sector can use multi-criteria analysis for the efficient and fair public procurement process implementation and the establishment of objective conditions for the contract awarding in accordance with the general social interests. In this sense, the paper presents a comparative approach to the Analytic Hierarchy Process and Analytic Network Process as the methods of support in decision making, measurement and evaluation criteria for the selection of the best bids in the procurement process. Hierarchical model with five criteria and nine sub-criteria and the network model, which takes into account the mutual influences of criteria, were developed in a hypothetical public procurement selection procedure for the best performers for the construction of the infrastructure facility. Selection of the best bidder, i.e. bids for the realization of the work, is distinctive, multi-criteria problem which includes both qualitative and quantitative factors.
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