15 results match your criteria Central European Journal Of Operations Research[Journal]

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Optimal investment and location decisions of a firm in a flood risk area using impulse control theory.

Cent Eur J Oper Res 2019 8;27(4):1051-1077. Epub 2018 Mar 8.

4Wittgenstein Centre (IIASA, VID/ÖAW, WU), Institute of Demography, Vienna University of Technology, Vienna, Austria.

Flooding events can affect businesses close to rivers, lakes or coasts. This paper provides an economic partial equilibrium model, which helps to understand the optimal location choice for a firm in flood risk areas and its investment strategies. How often, when and how much are firms willing to invest in flood risk protection measures? We apply Impulse Control Theory and develop a continuation algorithm to solve the model numerically. Read More

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http://dx.doi.org/10.1007/s10100-018-0532-0DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6951472PMC

Scheduling non-critical activities using multicriteria approach.

Cent Eur J Oper Res 2018 27;26(3):585-598. Epub 2018 Apr 27.

Department of Operations Research, University of Economics in Katowice, ul. 1 Maja 50, 40-287 Katowice, Poland.

In many projects the problem of selecting the start time of a non-critical activity arises. Usually it is possible to use the "as soon as possible" or "as late as possible" rules. In some situations, however, the result of such a decision depends on external factors such as exchange rate. Read More

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http://dx.doi.org/10.1007/s10100-018-0542-yDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6105254PMC
April 2018
39 Reads

Solving routing problems with pairwise synchronization constraints.

Cent Eur J Oper Res 2018 7;26(2):443-464. Epub 2018 Feb 7.

2Faculty of Business, Economics and Statistics, University of Vienna, Oskar-Morgenstern-Platz 1, 1090 Vienna, Austria.

Pairwise route synchronization constraints are commonly encountered in the field of service technician routing and scheduling and in the area of mobile care. Pairwise route synchronization refers to constraints that require that two technicians or home care workers visit the same location at exactly the same time. We consider constraints of this type in the context of the well-known vehicle routing problem with time windows and a generic service technician routing and scheduling problem. Read More

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http://dx.doi.org/10.1007/s10100-018-0520-4DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5945728PMC
February 2018
3 Reads

Stochastic contagion models without immunity: their long term behaviour and the optimal level of treatment.

Cent Eur J Oper Res 2018 7;26(2):395-421. Epub 2018 Feb 7.

Institute of Statistics and Mathematical Methods in Economics, Vienna University of Technology, Vienna, Austria.

In this paper we analyze two stochastic versions of one of the simplest classes of contagion models, namely so-called SIS models. Several formulations of such models, based on stochastic differential equations, have been recently discussed in literature, mainly with a focus on the existence and uniqueness of stationary distributions. With applicability in view, the present paper uses the Fokker-Planck equations related to SIS stochastic differential equations, not only in order to derive basic facts, but also to derive explicit expressions for stationary densities and further characteristics related to the asymptotic behaviour. Read More

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http://dx.doi.org/10.1007/s10100-018-0526-yDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5945815PMC
February 2018
1 Read

Exact solutions for the collaborative pickup and delivery problem.

Cent Eur J Oper Res 2018 15;26(2):357-371. Epub 2017 Nov 15.

Department for Business Administration, University of Vienna, Oskar-Morgenstern-Platz 1, 1090 Vienna, Austria.

In this study we investigate the decision problem of a central authority in pickup and delivery carrier collaborations. Customer requests are to be redistributed among participants, such that the total cost is minimized. We formulate the problem as multi-depot traveling salesman problem with pickups and deliveries. Read More

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http://dx.doi.org/10.1007/s10100-017-0503-xDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5945767PMC
November 2017
2 Reads

Funds allocation in NPOs: the role of administrative cost ratios.

Cent Eur J Oper Res 2018 27;26(2):307-330. Epub 2017 Dec 27.

2School of Administrative Studies, York University, 4700 Keele Street, Toronto, ON M3J 1P3 Canada.

Performance measurement of Non-Profit Organizations (NPOs) is of increasing importance for aid agencies, policy-makers and donors. A widely used benchmark for measuring the efficiency of NPOs is the overhead cost ratio, consisting of the total money spent on administration and fundraising relative to the budget. Donors generally favor a lower overhead cost ratio as it ensures that more money directly reaches beneficiaries. Read More

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http://dx.doi.org/10.1007/s10100-017-0512-9DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5945846PMC
December 2017
1 Read

Building a completely positive factorization.

Authors:
Immanuel M Bomze

Cent Eur J Oper Res 2018 15;26(2):287-305. Epub 2017 Nov 15.

ISOR and VCOR, University of Vienna, Vienna, Austria.

A symmetric matrix of order is called if it has a symmetric factorization by means of a rectangular matrix with columns and no negative entries (a so-called ), i.e., if it can be interpreted as a Gram matrix of directions in the positive orthant of another Euclidean space of possibly different dimension. Read More

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http://dx.doi.org/10.1007/s10100-017-0499-2DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5945802PMC
November 2017
1 Read

Why local air pollution is more than daily peaks: modelling policies in a city in order to avoid premature deaths.

Cent Eur J Oper Res 2018 28;26(2):265-286. Epub 2018 Mar 28.

2Department of Statistics and Operations Research, University of Graz, Universitaetsstrasse 15/E3, 8010 Graz, Austria.

We use a predator-prey representation of an urban system to analyse how policy interventions can prevent the adverse effects of air pollution on people's health. is treated as prey variable, and particulate matter that consists of particles with a diameter of up to 10 micrometres () as predator variable. This representation allows integration of population trends and the effects of environmental interventions on the average level of PM10 concentration (which establishes a baseline for the potential health burden for residents). Read More

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http://dx.doi.org/10.1007/s10100-018-0534-yDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5945742PMC

Heuristic algorithms for the minmax regret flow-shop problem with interval processing times.

Cent Eur J Oper Res 2018 29;26(1):215-238. Epub 2017 Jul 29.

Faculty of Computer Science and Management, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wrocław, Poland.

An uncertain version of the permutation flow-shop with unlimited buffers and the makespan as a criterion is considered. The investigated parametric uncertainty is represented by given interval-valued processing times. The maximum regret is used for the evaluation of uncertainty. Read More

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http://dx.doi.org/10.1007/s10100-017-0485-8DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5767222PMC
July 2017
2 Reads

Tight upper bounds for semi-online scheduling on two uniform machines with known optimum.

Cent Eur J Oper Res 2018 14;26(1):161-180. Epub 2017 Jun 14.

Helmut Schmidt University/University of the Federal Armed Forces Hamburg, Holstenhofweg 85, 22043 Hamburg, Germany.

We consider a semi-online version of the problem of scheduling a sequence of jobs of different lengths on two uniform machines with given speeds 1 and . Jobs are revealed one by one (the assignment of a job has to be done before the next job is revealed), and the objective is to minimize the makespan. In the considered variant the optimal offline makespan is known in advance. Read More

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http://dx.doi.org/10.1007/s10100-017-0481-zDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5767275PMC
June 2017
4 Reads

A framework for sensitivity analysis of decision trees.

Cent Eur J Oper Res 2018 24;26(1):135-159. Epub 2017 May 24.

SGH Warsaw School of Economics, Al. Niepodległości 162, 02-554 Warsaw, Poland.

In the paper, we consider sequential decision problems with uncertainty, represented as decision trees. Sensitivity analysis is always a crucial element of decision making and in decision trees it often focuses on probabilities. In the stochastic model considered, the user often has only limited information about the true values of probabilities. Read More

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http://link.springer.com/10.1007/s10100-017-0479-6
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http://dx.doi.org/10.1007/s10100-017-0479-6DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5767274PMC
May 2017
2 Reads

Measuring inefficiency for specific inputs using data envelopment analysis: evidence from construction industry in Spain and Portugal.

Cent Eur J Oper Res 2018 12;26(1):43-66. Epub 2017 Apr 12.

Department of Logistics, Institute of Applied Mathematics, Wroclaw University of Economics, Wrocław, Poland.

This article contributes to the efficiency literature by defining, in the context of the data envelopment analysis framework, the directional distance function approach for measuring both technical and scale inefficiencies with regard to the use of individual inputs. The input-specific technical and scale inefficiencies are then aggregated in order to calculate the overall inefficiency measures. Empirical application focuses on a large dataset of Spanish and Portuguese construction companies between 2002 and 2010 and accounts for three inputs: materials, labor and fixed assets. Read More

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http://dx.doi.org/10.1007/s10100-017-0473-zDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5767198PMC
April 2017
4 Reads

Newsvendor problem under complete uncertainty: a case of innovative products.

Cent Eur J Oper Res 2017 24;25(3):561-585. Epub 2016 Oct 24.

Department of Operations Research, Poznań University of Economics and Business, Al. Niepodległości 10, 61-875 Poznan, Poland.

The paper presents a new scenario-based decision rule for the classical version of the newsvendor problem (NP) under complete uncertainty (i.e. uncertainty with unknown probabilities). Read More

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http://dx.doi.org/10.1007/s10100-016-0458-3DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5556468PMC
October 2016

Generating subtour elimination constraints for the TSP from pure integer solutions.

Cent Eur J Oper Res 2017 17;25(1):231-260. Epub 2016 Feb 17.

Department of Statistics and Operations Research, University of Graz, Universitaetsstrasse 15, 8010 Graz, Austria.

The () is one of the most prominent combinatorial optimization problems. Given a complete graph [Formula: see text] and non-negative distances d for every edge, the TSP asks for a shortest tour through all vertices with respect to the distances d. The method of choice for solving the TSP to optimality is a . Read More

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http://dx.doi.org/10.1007/s10100-016-0437-8DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5480099PMC
February 2016
3 Reads

No such thing as a perfect hammer: comparing different objective function specifications for optimal control.

Authors:
D Blueschke I Savin

Cent Eur J Oper Res 2017 22;25(2):377-392. Epub 2016 Jun 22.

2Chair for Economic Policy, Karlsruhe Institute of Technology, Karlsruhe, Germany.

Linear-quadratic (LQ) optimization is a fairly standard technique in the optimal control framework. LQ is very well researched, and there are many extensions for more sophisticated scenarios like nonlinear models. Conventionally, the quadratic objective function is taken as a prerequisite for calculating derivative-based solutions of optimal control problems. Read More

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http://dx.doi.org/10.1007/s10100-016-0446-7DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6979702PMC
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