International Journal of Economics and Statistics


ISSN: 2309-0685
Volume 7, 2019

Notice: As of 2014 and for the forthcoming years, the publication frequency/periodicity of NAUN Journals is adapted to the 'continuously updated' model. What this means is that instead of being separated into issues, new papers will be added on a continuous basis, allowing a more regular flow and shorter publication times. The papers will appear in reverse order, therefore the most recent one will be on top.

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Volume 7, 2019


Title of the Paper: An Optimal Control Problem to Determine Optimal Paths of Some Macroeconomic Indicators - Empirical Study for Romania

 

Authors: Ana Andrei, Angela Galupa, Sorina Gramatovici, Irina Georgescu

Pages: 20-27

Abstract: In this paper we focus on the empirical application for Romania of an optimal control model having as state variables the the real wealth and expected inflation, as control variable real government expenditures and as objective function, the minimisation of the integral during initial and final time of the squared differences between actual real government expenditures and their corresponding political values. The dynamic system coefficients were calculated based on the equilibrium trajectory of IS-LM-SARS model using statistical data for Romania during 2001Q2-2016Q2 and computed the multipliers. We solved the model according to the Pontryagin’s theorem and we computed the paths in MATLAB by Runge-Kutta algorithm. Finally, we computed and forecast the main macroeconomic indicators, replacing the optimal values resulted from optimal control problem, in the equilibrium equations given by IS-LM-SRAS model.


Title of the Paper: The Assessment of Occupational Risks Factors

 

Authors: Dumitrascu A. E.

Pages: 16-19

Abstract: This paper present the methodology for assessing the occupational risks factors at work place. The process consist on identification of the risk factors, assessing and prioritizing the specific professional risks in order to identify and establish measures meant to protect the health and ensure the safety of the workers. The case study refers to the assessment of occupational risks factors specific to the components of work place: production system, work task, work environment and operator. The results of the assessment indicate that 50% represents the occupational risk factors of the production system, 25% represents the occupational risk factors of the operator, 9.3% represents the factors related to the working environment and 15.6% represents the factors related to the work tasks.


Title of the Paper: Analysis of the Problem of Intervention Control in the Economy on the Basis of Solving the Problem of Tuning

 

Authors: Peter Shnurkov, Daniil Novikov

Pages: 1-15

Abstract: The paper proposes a new stochastic intervention control model conducted in various commodity and stock markets. The essence of the phenomenon of intervention is described in accordance with current economic theory. A review of papers on intervention research has been made. A general construction of the stochastic intervention model was developed as a Markov process with discrete time, controlled at the time it hits the boundary of a given subset of a set of states. Thus, the problem of optimal control of interventions is reduced to a theoretical problem of control by the specified process or the problem of tuning. A general solution of the tuning problem for a model with discrete time is obtained. It is proved that the optimal control in such a problem is deterministic and is determined by the global maximum point of the function of two discrete variables, for which an explicit analytical representation is obtained. It is noted that the solution of the stochastic tuning problem can be used as a basis for solving control problems of various technical systems in which there is a need to maintain some main parameter in a given set of its values.