The 2 nd International Conference on Management, Engineering and Environment - ICMNEE BOOK OF ABSTRACTS of ICMNEE 2018.

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2 The nd International Conference on Management, Engineering and Environment - ICMNEE 08- BOOK OF ABSTRACTS of ICMNEE 08 Edited by: PhD Željko Stević PhD Milena Vukić PhD Vesko Lukovac Organizers: European centre for operational research (ECOR) Regional Association for Security and Crisis Management (RABEK) Mathematical Institute of the Serbian Academy of Science and Arts (SANU) Faculty of architecture, civil engineering and geodesy, University of Banja Luka The college of hotel management, Belgrade Belgrade, October -

3 08. All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, without prior written permission from the publisher. ISBN Publisher: Regional Association for Security and crisis management - RABEK and European Centre for Operational Research - ECOR Printed in the Republic of Serbia CIP - Katalogizacija u publikaciji - Narodna biblioteka Srbije, Beograd 005(08) 6(08) 355.4(08) International Conference on Management, Engineering and Environment ICMNEE ( ; 08 ; Obrenovac) Proceedings of ICMNEE 08 / The nd International Conference on Management, Engineering and Environment, [Obrenovac] ; edited by Željko Stević, Milena Vukić, Vesko Lukovac. - Beograd : RABEK and ECOR, 08 (Niš : GrafoMIS). - ilustr str. ; 4 cm Tiraž Napomene i bibliografske reference uz tekst. - Bibliografija uz svaki rad. ISBN a) Menadžment - Zbornici b) Inženjerstvo - Zbornici c) Logistika - Zbornici COBISS.SR-ID

4 President of Technical Program Committee Prof. Dr. Branko Babic, Serbia Technical Program Committee Full prof. Dr Edmundas Kazimieras Zavadskas, Lithuania Full prof. Dr Meshalkin Valery, Russia Full prof. Dr Ilija Tanackov, Serbia Full prof. Dr Irik Mukhametzyanov, Russia Full prof. Dr Said Salhi, United Kingdom Full prof. Dr Ivan Milojević, Serbia Full prof. Dr Sekulović Dragoljub, Serbia Full prof. Dr Marija Malenkovska Todorova, Macedonia Full prof. Dr Ivan Mihajlović, Serbia Full prof. Dr Oleg Butusov, Russia Full prof. Dr Miomir Stanković, Serbia Full prof. Dr Alex Bolshakov, Russia Full prof. Dr Dragan Radojević, Serbia Full prof. Dr Igor Bulatov, United Kingdom Full prof. Dr Pavle Gladović, Serbia Full prof. Dr Leonid Uliev, Ukraine Full prof. Dr Mirko Vujošević, Serbia Full prof. Dr Goran Ćirović, Bosnia and Herzegovina Full prof. Dr Zoran Bundalo, Serbia Full prof. Dr Slavko Vesković, Serbia Full prof. Dr Ali Reza Afshari, Iran Full prof. Dr Bogdana Stanojević, Serbia Full prof. Dr Miodrag Regodić, Bosnia and Herzegovina Full prof. Dr Predrag Atanasković, Serbia Full prof. Dr Ljubiša Preradović, Bosnia and Herzegovina Full prof. Dr Dragan Urošević, Serbia Full prof. Dr Slavoljub Vićić, Serbia Full prof. Dr Ivo Županović, Montenegro

5 Assoc prof. Dr Samarjit Kar, India Assoc prof. Dr Marko Vasiljević, Bosnia and Herzegovina Assoc prof. Dr Prasenjit Chatterjee, India Assoc prof. Dr Tatjana Stanivuk, Croatia Assoc prof. Dr Gordan Stojić, Serbia Assoc prof. Dr Ljbomir Gigović, Serbia Assoc prof. Dr Andrea Reverberi, Italy Assoc prof. Dr Jonas Jakaitis, Lithuania Assoc prof. Dr Peter Lakatos, Hungary Assoc prof. Dr Vaska Atanasova, Macedonia Assoc prof. Dr Jolanta Tamošaitienė, Lithuania Assist. prof. Dr Dragan Pamučar, Serbia Assist. prof. Dr Goran Maksimović, Bosnia and Herzegovina Assist. prof. Dr Ibrahim Ahmed Badi, Libya Assist. prof. Dr. Nenad Komazec, Serbia Assist. prof. Dr Rino Bošnjak, Croatia Assist. prof. Dr Vesko Lukovac, Serbia Assist. prof. Dr Morteza Yazdani, France Assist. prof. Dr Gordana Broćeta, Bosnia and Herzegovina Assist. prof. Dr Siniša Sremac, Serbia Assist. prof. Dr Slobodan Simic, Bosnia and Herzegovina Assist. prof. Dr Eli Marušić, Croatia Assist. prof. Dr Slobodan Simović, Bosnia and Herzegovina Assist. prof. Dr. Željko Stević, Bosnia and Herzegovina Assist. prof. Dr. Darko Božanić, Serbia Assist. prof. Dr. Zoran Bajić, Serbia Assist. prof. Dr. Ivan Petrović, Serbia Assist. prof. Dr. Negovan Ivanković, Serbia Assist. prof. Dr. Goran Popović, Bosnia and Herzegovina

6 Organising committee Ph.D. Milena Vukić, Serbia Ph.D. Dragisa Jurišić, Bosnia and Herzegovina PhD Jagannath Roy, India PhD Kajal Chatterjee, India PhD Velibor Jovanović, Serbia MSc Khubaib Amjad Alam, Malaysia MSc Mladen Amović, Bosnia and Herzegovina MSc Slobodan Peulić, Bosnia and Herzegovina MSc Milena Popović, Serbia MSc Gordana Jakovljević, Bosnia and Herzegovina MSc Krishnendu Adhikary, India MSc Duško Tešić, Serbia

7 Sponsors

8 Contents DIFFERENTIATION OF CROATIAN MARINAS THROUGH THE INTERNATIONAL BLUE FLAG PROGRAM Eli Marušić, Tatjana Stanivuk, Katarina Čala, Jelena Žanić Mikuličić. ACTIVITY AND RESEARCH RESULTS OF THE LUDOVIKA RESEARCH GROUP FOR THE FOOTPRINT OF PUBLIC SERVICE IN 07: CARBON FOOTPRINT OF THE HUNGARIAN POLICE IN 06 Péter Lakatos. UV RADIATION AND ITS EFFECT ON ENVIRONMENT AND HEALTH Sanja Korica, Ivona Stojiljković, Dragana Mitov.3 APPLICATION OF BWM-VIKOR MODEL IN INVESTMENT DECISION Vladimir Milovanović.4 THE SELECTION OF OPTIMAL TRANSPORT VEHICLE USING MULTI CRITERIA DECISION MAKING METHODS Milan Milosavljević, Sandra Kasalica, Maja Matić.5 APPLICATION OF MULTI-CRITERIA DECISION-MAKING IN THE SELECTION OF MANAGEMENT STAFF Branko Popović.6 RANKING OF ALTERNATIVES IN MENU EVALUATION USING ROUGH MAIRCA METHOD Slavisa Arsic, Rade Slavkovic, Dragan Pamucar.7

9 DETERMINATION OF THE ROLLING RESISTANCE COEFFICIENT FOR DIFFERENT VEHICLES Zdravko B. Nunić, Mesud Ajanović, Dario Miletić.8 NOVEL ROUGH DELPHI METHOD FOR DETERMINATION WEIGHTS OF CRITERIA Željko Stević, Goran Petrović, Dragiša Stanujkić 9 REGULATION OF FUNDING RULES FOR SMALL AND MEDIUM ENTERPRISES IN THE REPUBLIC OF SRPSKA Irena Đalić, Svetlana Terzić 0 MEASURING THE QUALITY OF LOGISTICS SERVICES IN THE TRANSPORT COMPANY USING THE SERVQUAL MODEL Zada Memić, Marko Vasiljević, Ilija Tanackov, Željko Stević PREDICTION OF GENERATED ELECTRICITY OF PHOTOVOLTAIC MODULES BY NEURO-FUZZY MODEL Mirko Stojčić, Aleksandar Stjepanović, Đorđe Stjepanović APPLICATION OF THE SWARA-DEMATEL MULTI-CRITERIA MODEL FOR DETERMINING WEIGHT COEFFICIENTS OF CRITERIA FOR SELECTING THE LOCATION OF SOLAR FARMS IN LIBYA Ibrahim Badi, Dragan Pamučar 3 APPLICATION OF THE BWM-AHP MULTI-CRITERIA MODEL FOR DETERMINING WEIGHT COEFFICIENTS OF CRITERIA FOR SELECTING THE LOCATION OF WIND FARMS IN LIBYA Ibrahim Badi, Dragan Pamučar 4 STATISTIC ANALYSIS OF ACCIDENTS IN LOGISTICS GASOLINE SYSTEM Drago Stojaković, Ilija Tanackov, Siniša Sremac 5

10 MARKETING MIX IN TRANSPORT Milica Milčić, Ivana Milenković, Tatjana Savković 6 DETERMINING THE PARKING NEEDS - A CASE STUDY OF THE CITY OF DOBOJ Dragana Nenadić, Jovan Mišić 7 CALCULATIONS AND PERFORMANCE EXCELLENCE INDICATORS CASE STUDY OF ACI MARINA SPLIT Tatjana Stanivuk, Marina Laušić, Eli Marušić, Josip Fumić 8 INTEGRATED ROUGH SWARA - ARAS MODEL FOR SELECTION OF ELECTRIC FORKLIFT Milevka Voćkić, Gordan Stojić, Biljana Stević 9 APPLICATION OF CIVILIAN UNMANNED AERIAL VEHICLES - DRONES FOR DATA COLLECTION IN AN ATTACK OPERATION Aleksandar Milic, Goran Popovic, Goran Djukanovic 0 INNOVATIVE TECHNOLOGIES FOR ARSENIC REMOVAL FROM WATER Dragoljub Sekulović, Siniša Drobnjak THE SELECTION OF FORKLIFT FOR WAREHOUSE OPERATION USING THE COMBINED AHP-MABAC MODEL Amina Ibrahimkadić, Elmina Durmić, Zdravko Božičković ANALYSIS OF CAPACITY AND LEVEL OF SERVICE AT SPECIFIC UNSIGNALIZED THREE-LEG INTERSECTION CASE STUDY DOBOJ Dunja Radović 3 DETERMINING THE IMPORTANCE OF THE CRITERIA OF TRAFFIC ACCESSIBILITY USING FUZZY AHP AND ROUGH AHP METHOD Milan Stanković, Pavle Gladović, Vladimir Popović 4

11 MOBILE MARKETING: IDENTIFYING NEW PERSPECTIVES OF MOBILE MARKETING THROUGH THE ANALYSIS OF THE MOST SUCCESSFUL CASE STUDIES OF MOBILE MARKETING CAMPAIGNS Aleksandra Stojiljković, Aleksandar Miletić, Slađana Đurić 5 FACTORS INFLUENCING ALKALI-AGGREGATE REACTION IN CONCRETE STRUCTURES Gordana Broćeta, Ivana Klarić 6 DEVELOPMENT OF GOODS LOADING MODELS IN RAILWAY TRANSPORT Snezana Mladenovic, Stefan Zdravkovic, Slavko Veskovic, Sladjana Jankovic, Zivota Djordjevic 7 OPTIMIZATION OF DANGEROUS GOODS TRANSPORT FROM ASPECT OF RISK MANAGEMENT IN URBAN ZONE Milos Tadic, Dragan Pamucar 8 HAZARDOUS MATERIALS TRANSPORTATION: APPROACH BASED ON LINEAR PROGRAMMING AND MULTICRITERIA DECISION MAKING Miloš Ristić, Dragan Pamučar 9 HOLISTIC MARKETING APPROACH IN INNOVATION ACTIVITY INFRASTRUCTURE INSTITUTIONS Aleksandar Miletic, Aleksandra Stojiljkovic 30 STATISTICAL INDICATORS AND RISK FACTORS IN TRAFFIC ACCIDENTS BY BUS Pavle Gladović, Nemanja Deretić 3 THE PARADOX OF CIVIL-MILITARY RELATIONS Srđan Blagojević, Srđan Starčević 3

12 DECISION-SUPPORT SYSTEM FOR THE PREDICTION OF PERFORMANCE OF CONSTRUCTION CONSULTING COMPANIES IN PUBLIC TENDERS Dragan Pamučar, Darko Božanić 33 APPLICATION OF THE FUZZY AHP-TOPSIS MODEL USING MA- ZHENG SCALE: SELECTION OF THE LOCATION FOR CROSSING THE TANKS OVER A FROZEN WATER OBSTACLE Duško Tešić, Darko Božanić, Aleksandar Milić 34 SELECTING LOCATION FOR CONSTRUCTION OF SINGLE-SPAN BAILEY BRIDGE BY APPLYING FUZZY MABAC METHOD Darko Božanić, Jovo Kočić, Duško Tešić 35 DEVELOPMENT OF FINANCIAL MODELS FOR INNOVATION ACTIVITY IN SERBIA Milan Mihajlovic, Aleksandar Miletic 36 ASPECTS OF INFLUENCE THE SOCIAL DIMENSION OF OPERATIONAL ENVIRONMENT IN CONTEMPORARY MILITARY OPERATIONS Aleksandar Dumić, Rade Slavković, Dejan Kurtov 37 DIGITAL STORAGE: SPACE MANAGEMENT Velibor Jovanović, Ognjen Petković, Momir Drakulić 38 SOLVING TECHNICAL PROBLEMS USING TRIZ PRINCIPLES APPLIED ON MILITARY ARMOURED VEHICLE PRAGA V3S Marija Markovic, Sanja Pejcic, Vladimir Vracaric 39 OPTIMIZATION OF TRANSPORT PROCESS USING MULTIPROITERIAL OPTIMIZATION David Pap, Dragan Pamucar, Vesko Lukovac 40

13 RISK ASSESSMENT OF THE LANDSLIDE BY APPLICATION OF THE ANFIS MODEL Milica Mladenovic, Nenad Komazec 4 GERMAN FOR SPECIAL PURPOSES (GSP) IN GASTRONOMY Andrea Žerajić, Ksenija Vukić, Milena Vukić 4 CAUSES OF INTERPERSONAL CONFLICTS IN HOSPITALITY INDUSTRY Ksenija Vukić, Milena Vukić, Andrea Žerajić, Milorad Vukić 43 IMPORTANCE OF GASTRONOMIC MANIFESTATIONS OF EASTERN SERBIA FOR TOURISM DEVELOPMENT Danijela Stojanović, Slobodan Čavić, Đorđe Stojanović 44 FUZZY PROCESS APPROACH TO LEVEL ASSESSMENT OF ENVIRONMENTAL PROTECTION ORGANIZATION Lukovac Vesko, Dušan Savić, Velibor Jovanović 45 DEFINITION OF INDIVIDUAL WEIGHTS OF DECISION MAKERS IN GROUP AHP SYNTHESIS Aleksandar Janković, Vesko Lukovac, Pavle Gladović 46 CARE ABOUT GUEST - MODEL FOR TOURIST ATTRACTING Vesna Pijevac, Aleksandar Božić, Mladenka Đurović, Stojmir Šubarić 47 DEVELOPMENT OF METHODOLOGY FOR THE SELECTION OF THE OPTIMAL TYPE OF PEDESTRIAN CROSSING, A CASE STUDY Jasmina Bunevska Talevska, Mite Ristov, Marija Malenkovska Todorova 48 vi

14 DIFFERENTIATION OF CROATIAN MARINAS THROUGH THE INTERNATIONAL BLUE FLAG PROGRAM Eli Marušić, Tatjana Stanivuk *, Katarina Čala 3 and Jelena Žanić Mikuličić 4 University of Split, Faculty of Maritime Studies; emarusic@pfst.hr University of Split, Faculty of Maritime Studies; tstanivu@pfst.hr 3 University of Split, Faculty of Maritime Studies; kcala@pfst.hr 4 University of Split, Faculty of Maritime Studies; jzanic@pfst.hr * Correspondence: tstanivu@pfst.hr; Tel.: Abstract: The paper explores possibilities of differentiation in the marina market through involvement in international programs related to the protection and preservation of the natural environment. The growth and development of the nautical tourism market encourages more investment in the improvement of existing and construction of new marinas globally. Consequently, increasing the quality of offered services and facilities, and the emergence of new competitors in the marina market, there is a growing need for an appropriate differentiation. One of the major factors for achieving competitive advantage and long-term business success is distinction offer of some marinas in respect of its competitors. Possession of certificates and awards by various world organizations that implement programs to protect the natural environment is a good source of differentiation. The most common type of awards is the Blue Flag. The Republic of Croatia is a good example because the ratio of the marinas with the Blue Flag and the total number of marinas gives it high position in Europe. Keywords: differentiation, marina, competitive advantage, the Blue Flag.

15 ACTIVITY AND RESEARCH RESULTS OF THE LUDOVIKA RESEARCH GROUP FOR THE FOOTPRINT OF PUBLIC SERVICE IN 07: CARBON FOOTPRINT OF THE HUNGARIAN POLICE IN 06 Péter Lakatos National University of Public Service, Budapest, Hungary * Correspondence: lakatos.peter@uni-nke.hu; Tel.: Abstract: Sustainable development is a complex and multidisciplinary research area of today s science. The research of water security and climate change has a considerable history at the National University of Public Service (NUPS). Taking as its base an earlier research workshop (Military Ecological Footprint Centre), the Ludovika research group for the Footprint of Public Service has been established and through this an international research capacity emerged, based on which NUPS may be one of the acknowledged research places of national higher education. The article is based on certain chapter of the book entitled Public Service and Sustainability and sets forth the most recent results of the researches made in connection with the police. Future plans include the establishment and operation of an excellence centre with the participation of an international research network especially for Visegrad 4 countries. Keywords: Sustainability, Public Service, Police, Carbon Footprint, Good State.

16 UV RADIATION AND ITS EFFECT ON ENVIRONMENT AND HEALTH Sanja Korica, Ivona Stojiljković, Dragana Mitov Faculty of Ecology and Environmental protection, University Union Nikola Tesla, Cara Dušana 6-64, 000 Belgrade, Serbia; * Correspondence: Abstract: This paper analyzes the basic characteristics of UV radiation and its impact on the environment and human health. The principal source of UV radiation is the Sun. As a part of the spectrum of the Sun radiation reaching the Earth and being mostly absorbed in the atmosphere, it is an important factor in the climate change that we are facing today. In this sense, UV radiation represents a dangerous hazard due to its weaker and weaker absorption in the depleted ozone layer of the Earth. This could lead to serious environmental and health problems. Nowadays, in most developed countries, solar UV radiation is monitored. The purpose of monitoring is to monitor the possible harmful effects of UV radiation on living organisms on Earth, primarily on humans, as well as to study the processes in the atmosphere related to solar UV radiation. Human activity is the main cause of ozone depletion, but it can also be a solution to the problem. Keywords: UV Radiation and Protection; Environment; Health. 3

17 APPLICATION OF BWM-VIKOR MODEL IN INVESTMENT DECISION Vladimir Milovanović University of defence in Belgrade, Military academy; * Correspondence: vaci84milovanovic@gmail.com Abstract: The model consists of a four phase. In the first phase, the criteria on the basis of which the optimal location of the apartment is selected is defined. By discussing with the experts, the criteria for managing the apartment were set. In the second phase, the evaluation of the experts on pre-defined criteria is collected and the average values of expert assessments are calculated. The Best-West method was used to determine the criterion coefficients. In the third phase, using the mathematical methods VIKOR, MABAC, COPRAS, TOPSIS and MAIRCA, the optimal location of the apartment is selected. The VIKOR model was taken for the basic model of multi-criteria decision making. In the fourth phase, we analyzed the sensitivity of the VIKOR model to the change in the weight criterion. For the purpose of research, the software for ranking of variant solutions was developed. The software was created in Excel program, in the form of Excel calculators, and in Lingo and Matlab for solving mathematical (non) equations. Keywords: alternative, criteria, weight coefficient, multi-criteria decision-making, consistency. 4

18 THE SELECTION OF OPTIMAL TRANSPORT VEHICLE USING MULTI CRITERIA DECISION MAKING METHODS Milan Milosavljević *, Sandra Kasalica, Maja Matić High railway school of vocational studies, Zdravka Čelara 4, Belgrade, Serbia Naftna industrija Srbije A.D., Milentija Popovića, Belgrade, Serbia * Correspondence: mimilan89@gmail.com Abstract. The realization of every transport process with dangerous goods follows a certain risk of unwanted event with harmful consequences. The risk can be reduced if all the necessary measures and activities are taken, and one of the key steps for effective risk management in the transport of dangerous goods is the choice of a transport vehicle that transports dangerous goods. The aim of this paper is to evaluate different transport vehicles using different methods of multi criteria decision making. Model is tested on real problem from Oil industry of Serbia (NIS). In this paper weight coefficients were obtained by AHP method, based on expert knowledge. Model contains of six alternatives and seven criteria: fuel consumption, price, volume, and engine power, failure of vital circuits, maintenance costs and environmental impact. Problem is solved using MABAC method, and results are compared with TOPSIS, EDAS, ARAS, COPRAS and MOORA method. In the final phase of this model, stability of the obtained results was checked through the sensitivity analysis. Spearman rank correlation coefficient was calculated between the ranks obtained by various methods. Keywords: tank truck selection, MABAC, MCDM methods. 5

19 APPLICATION OF MULTI-CRITERIA DECISION- MAKING IN THE SELECTION OF MANAGEMENT STAFF Branko Popović * Department of logistics, General Staff, Serbian Army, Belgrade, Serbia; branko.popovic84@yahoo.com; * Correspondence: branko.popovic84@yahoo.com; Tel.: Abstract: In this paper, the method for realization of the problems of choice management personnel using the model based on the methods of multiple criteria, where method the Analytic Hierarchy Process (AHP) is applied for defining the evaluation criteria and weight of evaluation criteria for the position of the head of the tactical the level of the Ministry of Defense and two multicriteria framework based on methods Technique for preferences by Symilarity to Ideal Solution (TOPSIS) and Multi-Border Approximation Attributive area Comparation (MABAC) are applied to the selection on the basis of defined criteria. Keywords: The selection of personnel, AHP, TOPSIS, MABAC. 6

20 RANKING OF ALTERNATIVES IN MENU EVALUATION USING ROUGH MAIRCA METHOD Slavisa Arsic,*, Rade Slavkovic, Dragan Pamucar Military Academy, University of Defence in Belgrade, Generala Pavla Jurisica Sturma 33, 000 Belgrade, Republic of Serbia; * Correspondence: arsic.slavisa@gmail.com; Tel.: Abstract: The evaluation of dishes represents basic activity in the structuring of menu, which allows the optimal use of resources in order to fully satisfy the expectations of users and restaurant management. This study presents a new approach in menu evaluation using the MultiAttributive Ideal-Real Comparative Analysis (MAIRCA) method, modified by application of rough numbers in dealing with imprecision in group decision making. The model was successfully tested on the menu of a collective nutrition restaurant, where the evaluation of six existing breakfast dishes and a new dish that should replace the worst ranking dish was carried out. Keywords: Menu Evaluation; Restaurant Management; Rough Number; Mairca; Collective Nutrition. 7

21 DETERMINATION OF THE ROLLING RESISTANCE COEFFICIENT FOR DIFFERENT VEHICLES Zdravko B. Nunić *, Mesud Ajanović and Dario Miletić 3, University of East Sarajevo, Faculty of Transport and Traffic Engineering Doboj, Bosnia and Herzegovina, University of East Sarajevo, Faculty of Transport and Traffic Engineering Doboj, Bosnia and Herzegovina, 3 University of East Sarajevo, Faculty of Theology Foča, Bosnia and Herzegovina * Correspondence: Abstract: In this paper, an experimental study on the determination of rolling resistance coefficient was carried out. The experiment tested a total of six different types of vehicles and calculated the rolling resistance coefficient, depending on the condition of surface and the type of tyres. The study is focused on achieving the main goals related to determining the impact of the interaction between tyres and surface on the rolling resistance coefficient and the effect of the coefficient values on fuel consumption. Motor vehicles were subjected to the "free stop" method on a horizontal road. In doing so, vehicle speed was registered every 0 seconds from an initial speed to stopping. In order to eliminate an error of possible roadway inclination or wind impact, the experiment was repeated five times on the same road section, as well as in the opposite direction. The experimental study was carried out during December 06 and January 07. Three sets of tyres were used for each vehicle, the tyres with tread depths of 8 mm, 6-7 mm and 4-5 mm, while the type of surface referred to dry and wet condition of the roadway. Both hypotheses have been confirmed, which means that the interaction of tyres and surface affects the value of rolling resistance coefficient that further affects fuel consumption. Keywords: Rolling Resistance Coefficient, Vehicle, Traffic Safety, Fuel Consumption. 8

22 NOVEL ROUGH DELPHI METHOD FOR DETERMINATION WEIGHTS OF CRITERIA Željko Stević *, Goran Petrović and Dragiša Stanujkić 3, University of East Sarajevo, Faculty of Transport and Traffic Engineering Doboj, Bosnia and Herzegovina, University of Niš, Faculty of Mechanical Engineering, Serbia, 3 University of Belgrade, Technical faculty in Bor, Serbia, * Correspondence: Abstract: The decision-making process in all areas requires understanding of a number of elements involved in this process. In that, very important role have the significance of the criteria on the basis of which evaluation or selection of alternatives is carried out. In this paper, the Delphi method is expanded with rough numbers for determining the relative weight of the criteria. The developed approach allows determining the significance of criteria based on an expert evaluation, which must be at least ten. The approach is demonstrated on the example of evaluating performance indicators in transport based on the assessment of 9 decision makers. A sensitivity analysis was performed in which the SWARA method was applied which gives very similar results with a developed approach. Taking into account both approaches, the only difference in the rankings of the criteria is at the last position. Keywords: Rough Delphi, weights of criteria, transport, key performance indicators. 9

23 REGULATION OF FUNDING RULES FOR SMALL AND MEDIUM ENTERPRISES IN THE REPUBLIC OF SRPSKA Irena Đalić *, Svetlana Terzić University of East Sarajevo, Faculty of Transport and Traffic Engineering, Vojvode Mišića 5, Doboj, Republic of Srpska, B&H; * Correspondence: i.naric@yahoo.com; Abstract: One of the main problems faced by SMEs in developing countries, but also in our country, is access to affordable sources of external financing. Also, on the other hand, financial institutions are reluctant to provide funding for small and medium-sized enterprises, especially those at the beginning of its development. One of the ways for both sides to be satisfied with the mutual cooperation is to regulate the rules by which economic activity of small and medium-sized enterprises is financed. In this paper we will try to find a model rule by which small and medium-sized enterprises funding would be granted. We believe that in this way the efficiency of the use of borrowed funds will increase and thus the number of investments will increase. This would lead to an increase in the number of small and medium-sized enterprises, and therefore to an increase in employment, which would lead to the economic development of the Republic of Srpska. Keywords: Funding rules, regulation, small and medium enterprises, economic development. 0

24 MEASURING THE QUALITY OF LOGISTICS SERVICES IN THE TRANSPORT COMPANY USING THE SERVQUAL MODEL Zada Memić, Marko Vasiljević, Ilija Tanackov and Željko Stević University od East Sarajevo, Faculty of Transport and Traffic Engineering Doboj, Bosnia and Herzegovina, University of Novi Sad, Faculty of Technical Science, Serbia, * Correspondence: Abstract: The quality of logistics services, if it is positive, can affect loyalty and user's satisfaction. Therefore, it is necessary to constantly measure the quality of the service and strive to improve its worst elements. The aim of this research is to determine the quality of logistics services for the company Bosnaekspress d.o.o. Doboj. To measure the quality of logistics services, one of the most well-known and most frequently used models, the SERVQUAL model, was used. The application of the SERVQUAL model allows obtaining concrete results for the conducted research in order to work on possible improvement. Within the SERVQUAL model, there are five key dimensions based on which a research team conducted a customer's satisfaction survey to establish the level of customer's satisfaction with the service offered by Bosnaekspress d.o.o. Doboj. Five key dimensions are: reliability, safety, tangibility, empathy and capability. Each of these dimensions has different significance for different users, what contributes to easier determination of the logistics services' quality. The obtained results show that users of logistics services of the given company are not satisfied with the same, that is, the quality is poor, because all dimensions have negative values of the difference in observations and expectations. A Signum test was applied for the purposes of statistical conclusions and variance analysis to determine the significance of significant changes on individual issues. Key words: Quality of logistics services; SERVQUAL model; transport, expectation, observation

25 PREDICTION OF GENERATED ELECTRICITY OF PHOTOVOLTAIC MODULES BY NEURO-FUZZY MODEL Mirko Stojčić *, Aleksandar Stjepanović and Đorđe Stjepanović University of East Sarajevo, Faculty of Transport and Traffic Engineering, Doboj; University of Novi Sad, Faculty of Technical Sciences, Novi Sad; * Tel.: Abstract: The fact that conventional energy sources are exhaustive and limited are increasingly encouraging research in the field of alternative and renewable energy sources. The electricity generated by solar photovoltaic modules and panels occupies an ever greater percentage in total electricity production, so it is clear that photovoltaic systems are increasingly integrating with the existing electricity network into one system or functioning as autonomous systems. The aim of the research is to create a model based on the principles of the fuzzy logic and artificial neural networks that will perform the task of predicting the maximum energy of photovoltaic modules as accurately as possible. The prediction should facilitate work in planning production and consumption, system management, economic analysis. The most important methods used in the research are modeling and simulation. Input and output variables are selected and in the ANFIS (Adaptive Neuro Fuzzy Inference System) model a set of their values is presented. Based on them it comes to the function of dependency. The prediction rating of the created model was performed on a separate data set for testing and a model with the lowest average test error value was selected. The performance of the model was compared with the linear mathematical model, which led to the conclusion that the ANFIS model gives more accurate results. Keywords: prediction, ANFIS (Adaptive Neuro Fuzzy Inference System), photovoltaic modules, artificial neural networks, fuzzy logic, RMSE (Root Mean Square Error).

26 APPLICATION OF THE SWARA-DEMATEL MULTI- CRITERIA MODEL FOR DETERMINING WEIGHT COEFFICIENTS OF CRITERIA FOR SELECTING THE LOCATION OF SOLAR FARMS IN LIBYA Ibrahim Badi *, Dragan Pamučar Misurata University, Faculty of Engineering, Misurata, Libya, University of defence in Belgrade, Military academy, Department of logistics, Pavla Jurisica Sturma 33, 000 Belgrade, Serbia, * Correspondence: Tel.: Abstract: Generating power using solar energy utilization has become more attractive recently. Libya has a variety of renewable energy resources, and it can provide a considerable portion of the energy demand for the country through solar energy. Therefore, with such potential, it is irrational to neglect sharing of solar energy in the Libya s energy mix. Thus, giving attention to the development of this industry is of a high priority decision, and selecting suitable site is a critical step in the decision making process. This study displays a new way of defining weight coefficients of criteria for determining optimal locations for the construction of solar plants, which implies the application of SWARA and DEMATEL models. This model was tested and validated on a case-study with three criteria and ten sub-criteria. The results show that technical criterion is the most important criterion, followed by economic criterion, and at last the environmental criterion. SWARA and DEMATEL weights are aggregated by means of a non-linear model in which higher values of the weights give a higher combined value of the weight coefficient and vice versa. SWARA-DEMATEL multi-criteria model goes beyond the restrictions of the one-sided application of factors. In addition, this model enables a simultaneous display of the influence of SWARA and DEMATEL weights information on the ranking of the alternatives. Keywords: SWARA, DEMATEL, Solar energy, Site selection, Libya. 3

27 APPLICATION OF THE BWM-AHP MULTI-CRITERIA MODEL FOR DETERMINING WEIGHT COEFFICIENTS OF CRITERIA FOR SELECTING THE LOCATION OF WIND FARMS IN LIBYA Ibrahim Badi *, Dragan Pamučar Misurata University, Faculty of Engineering, Misurata, Libya, University of defence in Belgrade, Military academy, Department of logistics, Pavla Jurisica Sturma 33, 000 Belgrade, Serbia, * Correspondence: Tel.: Abstract: Many countries have shifted toward sustainable energy using wind power plants. The increased energy demand stresses the decision makers toward utilizing the renewable resources. The selection of the proper wind farm site is a strategic decision, and is based on a group of criteria mainly considering the local conditions of its surrounding environment The BWM-AHP hybrid model is applied to determine weight coefficients of criteria for the construction of wind farms in Libya. A list of six main criteria and twenty two sub-criteria is evaluated. The results show that the most important criterion is safety and quality followed by social impressions. Keywords: Wind farms, sit selection, BWM, AHP, Libya. 4

28 STATISTIC ANALYSIS OF ACCIDENTS IN LOGISTICS GASOLINE SYSTEM Drago Stojaković, *, Ilija Tanackov and Siniša Sremac University of Novi Sad, Faculty of Technical Sciences, Trg Dositeja Obradovića 6, Novi Sad, Serbia; * Correspondence: Tel: Abstract. Use of gasoline as dangerous substance is relatively highly represented. Using gasoline as primary or secondary product in logistics subsystems causes a great number of accidents. It's dangerous substance which shouldn't cause great number of accidents because of its wide range of use. Gasoline is one of the most common dangerous substances. Consequences of accidents with gasoline are huge and if a range of accident is great, accident participants chances of survival are very low. Consequences on human health after accident are permanent if poisoning with carbon-monoxide appears, and beside of vital organs damage, it comes to damaging of accident participants psychomotor skills. Statistic analysis, which was applied in research, showed that consequences of the greatest number of accidents is fire and explosion. Also, high percent of deceased participants is very worrying. It indicates that attention should be paid on technological solutions of devices whose drive energy is gasoline. Keywords: gasoline, accidents, dangerous substances. 5

29 MARKETING MIX IN TRANSPORT Milica Milčić, Ivana Milenković, * and Tatjana Savković Faculty of Technical Sciences, University of Novi Sad, Republic of Serbia; * Correspondence: milenkovic@uns.ac.rs ; Tel.: Abstract: This paper has analyzed a medium sized (TC ) and small sized (TC ) transport company for passenger transport from the aspect of marketing mix which include the following instruments: people, product, price, personal sale, place and promotion. For the analysis of these instruments in the observed companies, it was used a comparative method. By comparing companies from practice many differences have been noticed in areas such as number of vehicles companies own, number of employees, invested funds, incomes and expenses. Apart from these differences it can still be concluded that companies are successfully operating on the market and the can meet the demands of their users on one hand, while being able to cover their costs and achieve profit on the other hand. Keywords: transport market; marketing; transport company. 6

30 DETERMINING THE PARKING NEEDS - A CASE STUDY OF THE CITY OF DOBOJ Dragana Nenadić, Jovan Mišić * Student, University of East Sarajevo, Faculty of Transport and Traffic Engineering Doboj, Bosnia and Herzegovina, dragana_95_@hotmail.com Student, University of Novi Sad, Faculty of Technical Sciences Novi Sad, Serbia, jovannmsc60@gmail.com. * Correspondence: jovannmsc60@gmail.com. Abstract: A passenger car is an integral part of people's lives for many years. It is believed that on average, the passenger car is only 0 percent of its working life, which means that the remaining ninety percent is stationed in one place - parked. Then it is no wonder that, today in a large number of cities (especially smaller towns), the primary problem of urban environment is the problem of parking. In order to solve the problem of parking, it is first of all necessary to optimally design the parking spaces within the offered city zone, provide the necessary number of parking spaces, and then equip parking lots or parking spaces on the street. One of the examples of cities that have the problem of street parking is the city of Doboj, on which territory a survey was conducted in order to determine the basic characteristics of parking. The research process implied an independent survey, in which registrations of passenger cars parked at a given location were carried out, and then on the basis of the collected data, the basic characteristics of parking were determined. Given the obtained results of the conducted research, at the end of the work, suggestions were made on how to improve parking services on the city's Doboj Keywords: Street parking; Parking place; Capacity 7

31 CALCULATIONS AND PERFORMANCE EXCELLENCE INDICATORS CASE STUDY OF ACI MARINA SPLIT Tatjana Stanivuk, *, Marina Laušić, Eli Marušić 3 and Josip Fumić 4 University of Split, Faculty of Maritime Studies; tstanivu@pfst.hr University of Split, Faculty of Maritime Studies; msarac@pfst.hr 3 University of Split, Faculty of Maritime Studies; emarusic@pfst.hr 4 University of Split, Faculty of Maritime Studies; josip.fumic88@gmail.com * Correspondence: tstanivu@pfst.hr; Tel.: Abstract: Nautical tourism is one of Croatia s fastest growing tourism products. Owing to its natural features, Croatia has been recognized as an attractive nautical destination. The network of modern ACI marinas has been developed over the past decades along the eastern shores of the Adriatic Sea. This is the biggest Mediterranean chain of marinas that provide standardized facilities and services. This paper discusses the business performance of one of them the ACI marina situated in the city of Split. Mathematical approach is necessary to analyze the full potential of nautical tourism as these tools are used to perform calculations when planning, designing and constructing marinas. In addition, mathematical methods contribute to the enhancement of the business performance through creating and processing of various statistical data, profit and loss calculation, remuneration calculation, following the throughput of boats in marinas, etc. Keywords: ACI marina Split; calculation; performance excellence indicators; BEX excellence model. 8

32 INTEGRATED ROUGH SWARA - ARAS MODEL FOR SELECTION OF ELECTRIC FORKLIFT Milevka Voćkić *, Gordan Stojić and Biljana Stević 3, University of East Sarajevo, Faculty od Transport and Traffic Engineering Bosnia and Herzegovina, milevkavockic@gmail.com University of Novi Sad, Faculty of Technical sciences, Serbia, gordan@uns.ac.rs 3 Energotehnika, Doboj, Bosnia and Hercegovina, biljana.jeremic47@gmail.com * Correspondence: milevkavockic@gmail.com Abstract: Performing activities and operations within the internal transport require adequate transportation and manipulative means. In order to be able to perform overload manipulations, storage, forklifts are most often used as means of internal transport. Nowadays, all means of transportation have a great influence on to the environment. Therefore, electrical forklifts are used very often for performing transport-manipulative activities. The aim of the paper is the application of the multi-criteria decision-making method for the best solution, ie an adequate forklift that will meet all needs. The selection of a used electric forklift was made using the Rough SWARA - ARAS model. The determination of the relative weights of the criteria was made using the Rough SWARA method, while the ranking was performed using the ARAS method. The results of this model have shown that the most preferred alternative is the Forklift 5, ie the Still RX electric forklift. Keywords: Electric forklift, Rough SWARA, ARAS, internal transport 9

33 APPLICATION OF CIVILIAN UNMANNED AERIAL VEHICLES - DRONES FOR DATA COLLECTION IN AN ATTACK OPERATION Aleksandar Milic *, Goran Popovic, and Goran Djukanovic 3 * University of Defense Belgrade; milickm5@gmail.com, International University Travnik; popovic.goran@yandex.com 3 Paneuropean University Apeiron Banja Luka; djukanovicg@gmail.com * mirkostojcic@hotmail.com; Tel.: Abstract: In this paper, the possibilities of using drones in the intelligent preparation of battlefields in combat assault operations are presented, focusing on identifying obstacles that the enemy has set in the form of minefields. The aim is to get as accurate information as possible about the exact location of mines in the defined area of use, using contemporary aeronautical surveillance resorts, in order to identify safe paths for the movement of forces during the execution of the attack operation. It will be pointed out to the capabilities that modern technology provides for getting information about land mines in the field, the advantages and disadvantages of individual solutions as well as the feasibility and costeffectiveness of mounting these systems on unmanned aerial vehicles. Keywords: Combat attacking operations; Intelligence battlefield preparation; Minefields; UAV. 0

34 INNOVATIVE TECHNOLOGIES FOR ARSENIC REMOVAL FROM WATER Dragoljub Sekulović,* and Siniša Drobnjak University Union - Nikola Tesla, Faculty of Business Studies and Law in Belgrade, Serbia; dragoljub.sekulovic@fpsp.edu.rs Military Geographical Institute, Belgrade, Serbia; sinisa.drobnjak@vs.rs * Correspondence: dragoljub.sekulovic@fpsp.edu.rs; Tel.: Abstract: Arsenic (As) is released into the aquatic environment through a complex combination of natural biogeochemical reactions and human interactions. The presence of increased concentration of arsenic in water sources is considered to be a global health risk. The problem of a large number of countries, as well as Serbia, is the contamination of drinking water by arsenic. Research shows that the importation of arsenic in the body even in small doses is very harmful. Except for individuals who are professionally exposed to arsenic, the most important way of exposure is personal intake through food and drink water, including drinks made from drinking water. The mean daily intake of arsenic from the drinking water should generally be less than 0 μg (recommended value World Healt Organization - WHO). New criteria in evaluation quality of drinking water have made necessarily development of new technologies, in order to fulfill the request. During the last years development of nanotechnology are being studied nanomaterials as adsorbents for the removal of various contaminants from water, including arsenic. The paper presents contemporary research connected to finding new technologies for removing arsenic from water, which would replace current ones based on filtration through nanomaterials and the use of grain adsorbents. Keywords: Arsenic, contamination, nanomaterials, carbon nanotubes, drinking water, adsorbents, adsorption.

35 THE SELECTION OF FORKLIFT FOR WAREHOUSE OPERATION USING THE COMBINED AHP-MABAC MODEL Amina Ibrahimkadić *, Elmina Durmić and Zdravko Božičković University of East Sarajevo, Faculty of Transport and Traffic Engineering, Vojvode Misica 5, Doboj, Bosnia and Herzegovina, * * Correspondence : ibrahimkadic96@gmail.com Abstract: Acquiring an adequate transportation and manipulative means for warehouse operation is an extremely important task. A warehouse is a dynamic system where the movement of goods is the most dominant activity. Therefore, warehouse operations should be carried out using the appropriate transportation and manipulative means. The aim of this paper is the selection of a forklift on the basis of previously conducted evaluation using the AHP-MABAC model. The AHP method was used to define the importance of criteria, while the ranking was made by applying the MABAC method. In order to check the stability of the model, the sensitivity analysis was conducted. Another three methods that give identical results SAW, ARAS and WASPAS were applied, and therefore the ranks are in the absolute correlation. Keywords: warehouse, forklift, AHP, MABAC, internal transport.

36 ANALYSIS OF CAPACITY AND LEVEL OF SERVICE AT SPECIFIC UNSIGNALIZED THREE-LEG INTERSECTION CASE STUDY DOBOJ Dunja Radović * Faculty of Transport and Traffic Engineering, University of East Sarajevo; dunja.radovic@sf.ues.rs.ba * Correspondence: dunja.radovic@sf.ues.rs.ba Abstract: Unsignalized intersections are the type of intersections where traffic is regulated by traffic signs and road markings. Usually, these are intersections where at least one way is controlled by stop or yield sign and that way is called minor road. The other way is designed like major road. These intersections are recognized in the world like TWSC (two way stop-controlled) intersections and the most common type of them that appears in our region are four-leg or threeleg intersections. The minor left-turning movement performed at unsignalized intersection is one of the most complex actions in traffic. In this paper is analyzed specific three-leg intersection. Level of service is determined using the procedure HCM 000. Obtained results are shown that the worst level of service is at minor left-turning approach. Keywords: unsignalized intersection; minor movement; level of service. 3

37 DETERMINING THE IMPORTANCE OF THE CRITERIA OF TRAFFIC ACCESSIBILITY USING FUZZY AHP AND ROUGH AHP METHOD Milan Stanković, *, Pavle Gladović and Vladimir Popović College of Applied Technical Sciences, Aleksandra Medvedeva 0, 8000 Niš, Serbia; (M.S.); (V.P.) Faculty of Technical Sciences, University of Novi Sad, 000 Novi Sad, Serbia; * Correspondence: Tel.: Abstract: When defining criteria that have an influence on traffic accessibility, it is necessary to take into account the specificity of a concrete urban unit. A large number of authors base own research on a small number of traffic access criteria using one of the decision-making methods. The methods on which research can be based are multi-criteria decision-making in combination with fuzzy logic and rough numbers that give relevant results and are widely applied in all fields of science today. Thanks to these methods, for problems where is a large number of solutions in which certain criteria are formed, a valid solution can be reached. When using these methods, it is necessary to emphasize that there is a certain degree of subjectivity of the decision maker, but this can be minimized using fuzzy or rough numbers. The aim of this paper is to compare the significance of particular criteria using the Fuzzy AHP method and the Rough AHP method, which would show differences in the values of weight significance criteria and their ranking. Keywords: traffic accessibility; impact criteria; comparative analysis; Fuzzy AHP; Rough AHP method. 4

38 MOBILE MARKETING: IDENTIFYING NEW PERSPECTIVES OF MOBILE MARKETING THROUGH THE ANALYSIS OF THE MOST SUCCESSFUL CASE STUDIES OF MOBILE MARKETING CAMPAIGNS Aleksandra Stojiljković, Aleksandar Miletić and Slađana Đurić, * Faculty of Economics in Subotica, University of Novi Sad; Subotica, Segedinski put 9-; Republic of Serbia; aleksandra.stojiljkovic@gmail.com Faculty of Organizational Sciences, University of Belgrade; 000 Belgrade, Jove Ilića 54, Republic of Serbia and Faculty of Economics in Subotica, University of Novi Sad; Subotica, Segedinski put 9-; Republic of Serbia. * Correspondence: aleksandra.stojiljkovic@gmail.com; Tel.: Abstract: Mobile technology is the fastest-growing technology today, and the latest researches show that the number of mobile technology users is increasing on a daily basis. This is an opportunity for marketing managers to take full advantage of mobile technology. The first things associated with mobile marketing are certainly SMS and MMS messages, mobile sites, mobile search, but also mobile applications, mobile games, mobile social networks, location based mobile marketing and mobile phone payment applications. However, there s an impression that a gap between mobile marketing numerous possibilities and its practical use still exists. This paper is the result of an extensive research of the most successful mobile marketing campaigns, 35 case studies, which won some of the first three awards (gold, silver, bronze) or entered the finals in various categories for the use of mobile marketing tools, according to MMA (The Mobile Marketing Association). The aim of this paper is to identify the most successful mobile marketing strategies which can improve performances of a company through analysis of the used mobile marketing tools and objectives of these mobile marketing campaigns. Keywords: Mobile marketing, mobile marketing strategy, mobile marketing campaigns. 5

39 FACTORS INFLUENCING ALKALI-AGGREGATE REACTION IN CONCRETE STRUCTURES Gordana Broćeta, Ivana Klarić Asst. prof., PhD, University of Banja Luka, Faculty of Architecture, Civil Engineering and Geodesy, Bulevar vovode Stepe Stepanovića 77/3, Banja Luka, B&H; MA CE, University of East Sarajevo, Faculty of Transport and Traffic Engineering, Ulica Vojvode Mišića 5, Doboj, B&H * Correspondence: Tel.: Abstract: Alkali-aggregate reactions in concrete pose a major problem that reduces the durability and working life of construction objects, especially those exposed a great deal of moisture and high temperatures. This paper analyzes the causes and consequences of chemical reactions in concrete that lead to this phenomenon, considering the types of aggregates used, cement types, additives as well as environmental conditions that favor this appearance. In order to prevent this phenomenon, it is necessary to use aggregates containing smaller amount of amorphous silica in the case of an alkali-silica reaction, or a limited amount of aggregates containing carbonates in the case of an alkali-carbonate reaction. It is recommended to use a cement containing small quantities of alkalis, as well as Portland cement with addition of granulated blast furnace slag, silica fume or fly ash, and also reduced humidity in the concrete. Key words: alkali-aggregate reaction, amorphous silica, alkali-carbonate reaction, alkali-silica reaction, alkalis. 6

40 DEVELOPMENT OF GOODS LOADING MODELS IN RAILWAY TRANSPORT Snezana Mladenovic, Stefan Zdravkovic *, Slavko Veskovic 3, Sladjana Jankovic 4 and Zivota Djordjevic 5,,3,4 University of Belgrade, Faculty of Transport and Traffic Engineering, Belgrade, Serbia; snezanam@sf.bg.ac.rs ; s.zdravkovic@sf.bg.ac.rs ; veskos@sf.bg.ac.rs 3 ; s.jankovic@sf.bg.ac.rs 4 5 Serbian Railways JSC, Belgrade, Serbia; zivota.djordjevic@srbrail.rs 5 * Correspondence: s.zdravkovic@sf.bg.ac.rs Abstract: The correct loading of goods wagons is essential to railway operators as well as infrastructure managers and payers of transport services. Incorrect loading is not just a threat to traffic safety but may result in the loss or damage of goods and delays in goods delivery, as well as damage to railway infrastructure and vehicles. Goods loading can therefore be treated as a traffic safety problem, which is by all means a legal imperative each business entity involved in goods transport has certain obligations, responsibility and rights and an optimization problem - a railway operator wants to make the highest profit possible, whereas all other business entities want to minimize their costs. This paper treats loading as an optimization problem, with all applicable safety regulations being formulated as mandatory constraints. In view of the fact that different kinds of goods are loaded into different railcars under different rules, the paper limits itself to the loading of palletized goods into covered railcars. In addition to standard constraints related to the loading of railcars used in international transport, as well as the railway line category and pallet type, the paper also analyzes a number of specific constraints that may be of great practical relevance. The described problem has been formalized as a zero-one integer linear mathematical programming task and has been solved by using developed software. Several numerical examples involving specific constraints have been presented and discussed. Keywords: goods loading model; railway transport; box pallets; mathematical programming. 7