EDITORIAL BOARD:

Editor-in-Chief:

Prof. DSc Mladen Velev, Technical University -Sofia

Managing Editor:

Assoc. Prof. Dr. Borislava Kolchagova, Technical University -Sofia

International Editorial Council:

Prof. DSc Gunter Specht, Technical University of Darmstadt, Germany

Prof. DSc Philippe Hermel, University of Versailles-St. Quentin, France

Prof. Dr. Svetan Ratchev, Nottingham University, United Kingdom

Prof. Dr. Michael Goke, Hochschule fur Oekonomie&Management, Dortmund, Germany

Prof. Dr. Peter Kurble, Hochschule fur Oekonomie&Management, Dortmund, Germany

Prof. Dr. Elina Gaile-Sarkane, Riga Technical University, Latvia

Prof. Dr. Jelena Stankeviciene, Vilnius Gediminas Technical University, Lithuania

Prof. Dr. Ivan Michailovich, University of Belgrade, Serbia

Prof. Dr. Zivan Zivkovic, University of Belgrade, Serbia

Prof. Dr. Todor Kralev, "St.St. Ciril and Metodi" University – Skopie, Macedonia

Prof. Dr. Hana Mikovcova, University of Economics – Praha, Czech Republic

Prof. Dr. Iveta Simberova, Brno University of Technology, Czech Republic

Prof. Dr. Arnoldina Pobedinskaite, Mykolas Romeris University, Lithuania

Prof. Dr. Tatiana Rtishcheva, Saint-Petersburg State University of Engeneering and Economics, Russia

Prof. Dr. Irina Kapustina, Sankt-Peterburg Polytechnical University “Peter the Great”, Russia

Prof. DSc Yosif Iliev, University of National and World Economy – Sofia

Prof. Dr. Diana Antonova, University of Ruse “Angel Kanchev”

Prof. Dr. Ivan Dakov, Technical University - Sofia

Prof. Dr. Ivan Paligorov, University of forestry – Sofia

Prof. Dr. Valentin Velev, University of Mining and Geology - Sofia

Prof. DSc Pencho Penchev, Veliko Tarnovo University “St.st. Cyril and Methodius”

Prof. Dr. Svetlana Dimitrakieva, "N.Y.Vaptsarov" Naval Academy - Varna

Assoc. Prof. Dr. Blago Blagoev, Economic University – Varna

Assoc. Prof. Dr. Iskra Panteleeva, The Academy of Economy Svishtov

Assoc. Prof. Dr. Tania Panajotova, Technical University - Varna

Editors:

Asos. Prof. Dr. Svetlana Borisova, Technical University – Sofia

Ass. Prof. Dr. Siya Veleva, Technical University - Sofia

Sen. Lecturer Yordanka Angelova, Technical University - Sofia