The main task of supply chain management is to balance efficiency and effectiveness. Numerous operational management strategies are used to make a supply chain efficient, one such is inventory management. In this paper, we will consider a particular part of a supply chain consisting comprising a manufacturer and a retailer with the goal of minimizing associated inventory costs. We will focus on an inventory of final products determined as the difference between supply and demand and are expressed as a function of price, inflation rate and change in inflation rate resulting in the possible speculations. The manufacturer’s inventory cost is a function of these same variables, with the retailer’s inventory cost having the same function in addition to the margin. The problem is formulated as a dynamic game to share the speculation problem. The optimization problems to be solved are optimal control theory problems with objective functions in the form of integral functional with the integrand depending on the state function and its first and second derivative. Show Document Type: Research Article Affiliations: 1: Zagreb School of Economics and Management, Jordanovac 110, 10000 Zagreb, Croatia 2: Croatian Catholic University, Ilica 242, 10000 Zagreb, Croatia Publication date: 01 January 2017 The winter issue of Croatian Operational Research Review (CRORR) journal – Volume 12, Number 2, 2021 is published! The issue consists of 8 original scientific papers from the area of operational research and related fields. See papers published in this issue: https://lnkd.in/eRcYAy46 The next issue is expected to be published in summer 2022. The Study of Depot Position Effect on Travel Distance in Order Picking Problem Croatian Operational Research Review Pub Date : 2021-01-01 Agung Chandra,Christine Natalia The aim of this paper is to estimate total effects of the ICT sector to the growth and development of the Croatian economy. Direct, indirect and induced effects for the period 2010-2015 are expressed in terms of output, gross value added and employment. Output, gross value added and employment of ICT sector is estimated by using hypothetical extraction method. Empirical results of conducted analyzes department) in Croatian companies and to address the specific features of the function that contribute significantly to overall business performance. The research is conducted on the sample of companies listed on the Regulated market of the Zagreb Stock Exchange. Survey is used as a method to collect the data regarding the controlling function, while financial data necessary for the research are extracted from the published financial statements. Results of the research indicate that controlling department has positive effects on the business performance. Key words:Dynamic environment, Management, Controlling, Business performance 1. INTRODUCTION Controller, controllership and controlling are not among the most clearly defined terms, both in theory and in practice. Preißler (2007: 14) argues that everybody has their own idea of what controlling means or should mean, and everybody means something different. This is partly because controlling is We are very glad to introduce this first special issue of the Croatian Operational Research Society, which was established in 1992 and has a fruitful collaboration with the Central European Journal of Operational Research since its inception. The area of OR has been one of the core subjects at Croatian universities decades ago. In today’s age of advanced computing technologies that are able to process large quantities of data, it is becoming even more attractive and involved. Croatian Operational Research Society gathers more than 150 researchers with the mission to promote operational research in Croatia and worldwide which has been realized through several goals: (1) to encourage collaboration of scientists and researchers in the area of operational research in Croatia and worldwide through seminars, conferences, lectures and other ways of collaboration, (2) to organize the International Conference on Operational Research (KOI), and (2) to publish scientific journal Croatian Operational Research Review (CRORR). Since 1994, CRORS is a member of the Association of European Operational Research Societies (EURO) and the International Federation of Operational Research Societies (IFORS), and actively participates in their activities. The contribution of CRORS was rewarded in 2008 by a Charter of recognition from Elise A. del Rosario, the president of EURO at that time. On the occasion of publishing this special issue, we would like to thank the former presidents of CRORS: Luka Neralić, Tihomir Hunjak, Kristina Šorić, Valter Boljunčić, and Zoran Babić, as well as to other members of CRORS for their efforts in developing the society and its impact in OR research. The CRORS has organized 16 international conferences KOI so far in different cities in Croatia, and continuously publishes Croatian Operational Research Review journal (now included in relevant databases such as WoS ESCI and Scopus), as well as CRORS News Magazine. The sixteen (16) papers in this issue bring into the light some recent research results of CRORS members and their international collaborators. There are four (4) papers in honor of Goran Lešaja’s birthday that cover various optimization problems and methods. The paper written by Csizmadia et al. () considers the primal quadratic simplex method for linearly constrained convex quadratic programming problems. The paper of Darvay and Takács () proposes a large-step IPM in the new wide neighborhood of the central path for. In the paper Cvetković et al. () discuss some new complexity indices for traveling salesman problem (TSP). The paper of Peric et al. () suggests a new method based on the cooperative game theory (MP method) and compare its efficiency with a STEM method. There is a group of papers in the area of multicriteria optimization such as the paper of Targiel et al. () which suggests a model for scheduling non-critical activities under uncertainty and follows up some previous results of multicriteria optimization under uncertainty published in CEJOR (Gaspars-Wieloch ). Uncertainty was also the subject in the paper of Kvet and Janáček () who compare scenario and fuzzy values approaches. Kadoić et al. () propose a new method for strategic decision making in higher education based on the analytical network process (ANP) and social network analysis (SNA) using centrality measures which were also discussed in previous issues of CEJOR (Csató ). Kojić and Lukač () suggest an alternative approach to solving cost minimization problem with Cobb–Douglas technology based on weighted arithmetic–geometric mean inequality without using calculus. The two papers in this issue propose new approaches for using optimization algorithms and clustering in the domain of policy; Marošević and Soldo () suggest a modification for calculating indices of political power within a parliament, while Jelić and Ševerdija () provide a model inspired by the team formation problem in a social network that suggests a subset of candidates for positions in the new government using integer linear programming. One of the frequent topics among Croatian OR researchers is the Data Envelopment Analysis (DEA) in various domains. The paper of Borozan and Borozan () explores the total-factor energy efficiency and change trends in technical efficiency in the Croatian counties by DEA, while Gardijan and Lukač () use DEA to measure relative efficiency of food and drink industry in EU. The paper of Majstorović et al. () deals with graph theory, namely growth curve clustering problem, and analyzes its connection with the spectral relaxation method, showing that the eigendecomposition of a specific matrix associated with a similarity graph can be a solution. There are two papers in the area of statistics. The paper of Hamedović et al. () estimates the size of an object from a noisy image by using two one-dimensional parametric models to construct confidence intervals and statistical tests. Kramarić et al. () use nonhierarchical cluster analysis to explore insurance companies in selected post-transition countries. Finally, this issue contains a paper that deals with mapping of seismic parameters of the Iberian Peninsula by means of a geographic information system (Amaro-Mellado et al. ). It is worth to mention that some of the authors in this special issues are young researchers such as Jelić and Ševerdija () who were awarded with the Best Student Research Paper Award at KOI 2016 conference. The special issue contains papers with wide range of relevant and contemporary topics in the area of OR which were also discussed by other authors in previous issues of this journal and other OR journals, such as the topics of IPM (Meszaros ), multicriteria optimization (Trdin and Bohanec ), social network analysis (Csató ), game theory (Aust and Buscher ; McCormick and Owen ). DEA (Šegota et al. ), clustering (Scitovski et al. ), and graph theory (Vinkó and Gelle ). The collaboration and exchange of ideas is one of the key factors of success and development in modern science. We believe that Croatian OR Society researchers engaging in collaboration and cooperation with each other and with researchers from other OR societies will continue to produce high quality research results and advance the field of OR in Croatia and abroad. We hope that this Special Issue is a good representation of such efforts and will spark interest and future research in featured areas and beyond. Osijek, April 2018. References
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Corresponding authorCorrespondence to Marijana Zekić-Sušac. Rights and permissionsAbout this articleCite this articleZekić-Sušac, M., Scitovski, R. & Lešaja, G. CEJOR special issue of Croatian Operational Research Society. Cent Eur J Oper Res 26, 531–534 (2018). https://doi.org/10.1007/s10100-018-0558-3 |
