Прегледај по Аутор "Vasković, Srđan"

Сада се приказује 1 - 20 од 34
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    Ability of managers for crisis management in small enterprises: study in Bosnia and Herzegovina
    (2017) Medaković, Vlado; Moljević, Slaviša; Gojković, Ranka; Vasković, Srđan
    Since the enterprise have been existing, crisis of enterprise is well-known. Researches in area of possible appearance crisis in small and medium size enterprises, and sciense enterprise management which is crisis, have large significance when we talk about survival those enterprises, apropos possible prevention their bancrot. We can see that theory is mostly dedicated to enterprises repairing. The early symptom in sight of crisis and prevention latent crisis of enterprise are pointed up. Crisis management and analysis of strategy for turn out from the crisis, as we can see in this is paper, expand views and enable giving certain recomendations for appliance in practice.
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    ANALIZA OSJETLJIVOSTI SNABDIJEVAČKIH LANACA DRVNIM PELETOM ZA REALNE USLOVE KOJI ODGOVARAJU BOSNI I HERCEGOVINI
    (Mašinski fakultet Istočno Sarajevo, Univerzitet u Istočnom Sarajevu, 2018) Vasković, Srđan; Radović, Zoran; Batinić, Krsto; Halilović, Velid; Gvero, Petar; Gajić, Anto; Mrkić, Maja Bosančić; Golubović, Dušan; Košarac, Aleksandar; Jeremić, Dejan
    Biomasa predstavlja značajan obnovljivi resurs. Posebno ako se njenom korišćenju prilazi sistematski i uz dobro planiranje. Drvna biomasa je najznačajniji predstavnik biomase koji se već uveliko koristi u proizvodnji peleta. S obzirom da je veliki broj mašina, postrojenja, ljudi i opreme uključen u proizvodni lanac peleta, potrebno je ustanoviti koji to faktori i koliko utiču na ovaj proces. Prije svega misli se na konačno formiranje cijene drvnog peleta i njegove zavisnosti od drugih energenata, cijena sirove biomase, transportnih distanci, cijene električne energije i slično. Ovaj rad je spojio proizvodni lanac peleta sa postrojenjem i distribucijom toplote u objekat preko odgovarajućeg matematičkog modela. Upravo smo u prošle dvije godine bili svjedoci nedostataka drvnog peleta i naglog porasta njegove cijene na tržištu. To svakako dodatno promoviše ovu problematiku i daje joj smisao za istraživanje. Postavlja se pitanje šta su realni uslovi pri kojima treba da dođe do povećanja cijena peleta na tržištu i za koliko? Odgovore na to daje ovaj rad.
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    Analiza temperatura na mjernim mjestima komponenti vjetroagregata 1 u VE „Rudine“
    (Savez inženjera i tehničara Srbije, 2022) Krunić, Gojko; Vasković, Srđan; Krile, Srećko; Reščec, Boris; Bojović, Nebojša
    U radu je prikazana analiza temperatura na mjernim mjestima pojedinih komponenti vjetroagregata 1 u Vjetroelektrani (VE) „Rudine“. Opisane su karakteristike čvorišta, multiplikatora, generatora i gondole vjetroagregata 1. Prikazana su kretanja temperatura na mjernim mjestima pomenutih komponenti u toku jednog dana tokom različitih ekvidistantnih desetominutnih intervala. Analizirane su minimalne, prosječne i maksimalne temperature na mjernim mjestima komponenti vjetroagregata 1, evidentirana vremena njihovog pojavljivanja i navedeni su desetominutni intervali u kojima su one izmjerene. Upoređivanjem mjernih podataka izmjerenih na mjernim mjestima komponenti vjetroagregata 1 moguće je uočiti njihovu međusobnu zavisnost.
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    ANALYSIS AND EVALUATION OF KEY INFLUENCING FACTORS ON THE OPTIMIZATION OF THERMAL ENERGY CONSUMPTION IN INDUSTRIAL THERMAL POWER PLANTS
    (Vinča Institute of Nuclear, 2024) Simić, Stojan; Orašanin, Goran; Milić, Davor; Vasković, Srđan; Bakić, Vukman; Oka, Simeon; Jovanović, Marina
    In the past, the design and operation of industrial thermal power plants did not give importance to energy consumption. Due to the depletion of fossil fuel reserves and the rising of their prices, restrictions in emission of waste gases into atmosphere, and the need to reduce production costs over the last thirty years, greater attention has been paid to optimizing thermal energy consumption. Various technical, technological, and organizational measures are undertaken to reduce thermal energy consumption. This study examines the proposals for improving the efficiency of thermal energy production in four thermal power plants in Bosnia and Herzegovina. The activities aimed at improving energy efficiency are consolidated and presented through five measures. To determine the optimal measure, the criteria for evaluating each measure are defined. These criteria are analyzed and filtered by using the ISM method, and while the fuzzy AHP method was used for their weights. Finally, the fuzzy TOPSIS method for multi-criteria optimization is applied to select the optimal energy efficiency measure for the analyzed thermal power plants. Additionally, the research defines the order of implementing the selected measures to improve the energy efficiency of the studied thermal power plants.
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    Application of Multi Criteria Decision Making for the Selection of Optimal Solid Wood Fuel Supply
    (Faculty of Electrical Engineering, University of East Sarajevo, 2018) Vasković, Srđan; Gvero, Petar; Batinić, Krsto; Halilović, Velid; Medaković, Vlado; Musić, Jusuf
    Production of solid fuels from wooden biomass is defined with appropriate energy chain of supply. The notion of energy chain concept has been defined as the trajectory of energy transformations from the fuel source or energy sources to useful energy form to end users. Supply chain for production solid fuels from wooden biomass is also energy chain with high importance in biomass energy planning. In this paper, base for testing and research is developed mathematical model in previous published paper with preliminary note titled as “Multi-Criteria Optimization Concept for the Selection of Optimal Solid Fuels Supply Chain from Wooden Biomass“ at Croatian Journal of Forest Engineering. Three supply chains have been included in comparison: production of wood chips at the terminal – variant 1, production of pellet – variant 2 and production of wood chips by means of a mobile chipper in a forest – variant 3. The VIKOR methodology is used for total ranking all mentioned chains. Real input data have been used for mathematical calculation correspond to Bosnia and Herzegovina conditions.
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    BIOMASS AND SUSTAINABLE DEVELOPMENT OF LOCAL COMMUNITIES
    (University Politehnica Timisoara, Faculty of Engineering Hunedoara, 2014) Vasković, Srđan; Medaković, Vlado
    Energy production from biomass is very specific because they use different technologies to obtain useful products. All the conversion of biomass into useful energy, efficiency factor describes the energy chain, from biomass resources as the energy source. This includes the collection and preparation of remains, and storage of organic residues to the end use and the conversion of biomass into heat or electricity. In Bosnia and Herzegovina there are many possibilities for both growing and using forest for energy producing. Successful examples taken from forestry management practice in EU countries can be useful for enterprises, owners, commerce and environment in BiH.
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    Building Capacities for Sustainable Energy in Municipalities of Western Balkans
    (Instituut vóór Duurzame Ontwikkeling vzw, 2016) Kordas, Olga; Pasichnyi, Oleksii; Pereverza, Kateryna; Mulder, Karel; Segalas, Jordi Coral; Tejedor, Gemma; Ivezić, Dejan; Živković, Marija; Babić, Milun; Končalović, Davor; Gvero, Petar; Vasković, Srđan; Vujadinović, Radoje; Nikiforovich, Eugene
    This paper discusses challenges of capacity building in sustainable urban energy planning and development in Western Balkan Countries (WBC). It identifies needs in training of municipal staff and addresses obstacles for transferring sustainable energy education from EU universities to universities of WBC. The analysis of the ten training courses developed and piloted in collaboration with academic and non-academic stakeholders in Bosnia and Herzegovina, Montenegro and Serbia shows that while international cooperation has a good potential to improve quality of capacity building and to catalyse university-society collaboration in WBC, significant efforts on national and local (university) levels are needed to fully capitalise on these opportunities. In particular, it is necessary to enhance an interdisciplinary approach to education in sustainable energy, incorporating economic, social and institutional aspects of energy production and consumption together with the technical ones. On the national level, the lifelong learning system should get political and financial support in WBC to ensure efficiency and continuity of the training activities.
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    Comparative characteristics of compressed natural gas CNG and wood biomass supply chains
    (Šumarski Fakultet Univerziteta u Sarajevu, 2023-07-31) Vasković, Srđan; Kozić, Dušan; Ašonja, Goran; Gvero, Petar; Munjić, Aleksandar; Avdagić, Admir
    In this paper, general characteristics related to the supply chain of compressed natural gas (eng. CNG - Compressed Natural Gas) are given. Compressed natural gas is stored in a compressed gas state in tanks (bottles), in contrast to liquefied natural gas (eng. LNG - Liquefied Natural Gas) in which natural gas is stored in liquid form. The production and storage of compressed natural gas is somewhat cheaper compared to liquid natural gas, with the fact that the storage volumes are different. From all of this, there is a need to analyze the supply chain with CNG from the aspect of the compression process, transportation and storage costs. This paper describes the process of exploitation of CNG as a fuel for the conditions of functioning of the supply chain in Bosnia and Herzegovina. Real data related to the process of compression, transportation and storage of natural gas were taken from the company: “Prvo gasno društvo” D.O.O. Zvornik. The paper analyzed the indicators of the chain like energy efficiency, CO2 emissions and production cost reduced per 1 kWh of energy expressed in the lower heat value (LHV) of the distributed fuel. Also, a short comparison of the supply chains by CNG, wood pellets and chips as fuels is presented by the MCDM method. From the aspect of transport logistics, CNG has significantly better predispositions compared to other supply chains of pellets and wood chips, taking into account the energy efficiency of its process as well as the cost of supply logistics itself. However, CNG belongs to the category of fossil fuels.
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    DETERMINATION VALUES OF FINANCIAL SUBSIDIES IN ACCORDANCE WITH THE EXERGY QUALITY FOR FUELS AND HEAT PRODUCED FROM BIOMASS
    (Faculty of Engineering Hunedoara, University Politehnica Timisoara, 2017) Vasković, Srđan; Gvero, Petar; Kalabić, Dragana; Medaković, Vlado; Husika, Azrudin
    The importance of bioenergy is particularly evident in recent years. The most important part in bioenergy supply chain is production of fuels. Due to cheaper energy production from fossil fuels, energy from biomass is less competitive than fossil energy. For this reason, there are subsidies for energy production from biomass. In the Republic of Srpska and Bosnia and Herzegovina there are defined only subvention for electricity produced from biomass, while the lower forms of energy are not subsidized. In accordance with the defined amount of subsidies for 1 kWh of the produced electricity we can define the value of subsidies for the produced heat energy and fuels from biomass. For that we should take into account exergy quality of these forms in comparison with electricity. This paper describes one such approach.
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    ENERGETSKI I EKOLOŠKI ASPEKTI PRIMENE GORIVA DOBIJENOG IZ OTPADA (RDF/SRF)
    (Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije (SMEITS), Društvo za procesnu tehniku, 2016) Simić, Stojan; Stanojević, Miroslav; Orašanin, Goran; Vasković, Srđan; Pajkić, Jovana
    U savremenom društvu produkuju se relativno velike količine otpadnog materijala iz različitih izvora. Dobijanje goriva iz otpada od posebnog je značaja kako sa ekološkog, tako i sa ekonomskog aspekta. Gorivo dobijeno iz otpada najčešće se u odgovarajućem odnosu suspaljuje sa čvrstim fosilnim gorivom u gradskim toplonama, termoelektranama, industrijskim energanama i cementarama. Ovo gorivo predstavlja kvalitetan energent koji se koristi za proizvodnju energije i koji zadovoljava kriterijume kvaliteta propisane evropskim standardima za alternativna goriva.
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    ENERGETSKI INDEKS PROIZVODNJE DRVNOG ČIPSA
    (Mašinski fakultet Istočno Sarajevo, Univerzitet u Istočnom Sarajevu, 2016) Vasković, Srđan; Gvero, Petar; Medaković, Vlado; Halilović, Velid; Ikić, Marko; Ašonja, Goran; Marković, Biljana; Antunović, Ranko
    Proizvodnja čvrstih biogrova definisana je odgovarajućim energetskim lancem snabdijevanja. Proces proizvodnje čvrstih goriva iz drvne biomase počinje sa tehnologijama za skupljanje drvnog ostatka, počev od obaranja stabla pa sve do sistema za preradu (za usitnjavanje, drobljenje, sušenje, presovanje ukoliko se pravi briket ili pelet). Efikasnost proizvodnje drvnog čipsa je u relaciji sa ukupnom uloženom energijom po 1 kWh donje toplotne moći proizvedenog goriva. Ovaj rad će prikazati analizu ukupno uložene energije u snabdijevačkom lanacu proizvodnje drvnog čipsa u funkciji od transportnih distanci i vlage u drvetu. Model za analizu energetskog indeksa proizvodnje drvnog čipsa urađen je u softverskom paketu Mathcad.
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    ENERGY INDEX FOR THE PRODUCTION OF WOODEN CHIPS
    (University Politehnica Timisoara, Faculty of Engineering Hunedoara, 2015) Vasković, Srđan; Gvero, Petar; Medaković, Vlado; Halilović, Velid; Ikić, Marko; Jokić, Srđan; Kalabić, Dragana
    Production of solid fuels from wooden biomass is defined with appropriate energy chain of supply. Procedure for production of solid fuels from wooden biomass, starting with technology for gathering wooden residues and residues from logging up by the system of fuels production (system for milling, crushing, chopping, drying and pressing of wooden residues), presents energy chain of supply with solid fuel from biomass. Efficiency of production wooden chips is the relation of overall invested energy per 1 kWh of lower heating value of produced fuel. This paper will analyze total invested energy in supply chain for production wooden chips as a function transport distance and wood moisture. Paper will mathematically describe chain of wooden chips production from forest transported to the sawmill and to the terminal of processing. Mathematical model for calculation energy index developed in Mathcad software.
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    FEASIBILITY STUDY FOR REPLACEMENT HEATING SYSTEM ON NATURAL GAS WITH PELLET BOILERS AT PRIMARY SCHOOL “ST. SAVA” IN EAST SARAJEVO
    (University Politehnica Timisoara, Faculty of Engineering Hunedoara, 2016) Vasković, Srđan; Gvero, Petar; Medaković, Vlado; Halilović, Velid
    This study describes the possibility of installation of pellet boilers for the production of thermal energy for heating in the primary school “Sveti Sava” in Lukavica. Existing heating system with natural gas turned out to be very expensive with high costs in terms of consumption of natural gas on annual level but also due to the high price of natural gas. Alternative possibility of heating premises within the school is seen in the installation of boilers that use wood pellets as an energy source. Above all, wood pellet represents an environmentally clean fuel in terms of CO2 emissions, but also because of the availability of resource from nearby factories that produce pellets, it can be used as a domestic fuel. In this way, the story of sustainable community development is encouraged, as well as the flow of capital within the community is closed.
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    FEASIBILITY STUDY FOR REPLACMENT HEATING SYSTEM ON NATURAL GAS WITH PELLET BOILERS AT PRIMARY SCHOOL "SVETI SAVA " IN LUKAVICA
    (Mašinski fakultet, Univerzitet Istočno Sarajevo, 2014) Vasković, Srđan; Gvero, Petar; Medaković, Vlado; Halilović, Velid; Milić, Davor; Marković, Biljana; Antunović, Ranko; Kraišnik, Milija
    This study describes the possibility of installation of pellet boilers for the production of thermal energy for heating in the primary school "Sveti Sava" in Lukavica. Existing heating system with natural gas turned out to be very expensive with high costs in terms of consumption of natural gas on annual level but also due to the high price of natural gas. Alternative possibility of heating premises within the school is seen in the installation of boilers that use wood pellets as an energy source. Above all, wood pellet represents an environmentally clean fuel in terms of CO2 emissions, but also because of the availability of resource from nearby factories that produce pellets, it can be used as a domestic fuel. In this way, the story of sustainable community development is encouraged, as well as the flow of capital within the community is closed .
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    INFORMACIONE TEHNOLOGIJE I SAVREMENI TRENDOVI OBLIKOVANJA ORGANIZACIJE
    (Elektrotehnički fakultet, Univerzitet istočno Sarajevo, 2011) Medaković, Vlado; Radić, Nebojša; Vasković, Srđan
    Cilj ovog rada je da ukaže na nove izazove u modernom korporativnom upravljanju i primjenu informacionih tehnologija kao mogući odgovor u pogledu na visok nivo turbulencija. Pokazalo se da klasična organizacija i upravljanje predstavljaju ograničavajući faktor za primjenu novih tehnologija, naročito informacionih tehnologija i da je neophodno fundamentalno promijeniti korporativni dizajn u cilju postizanja boljih performansi. Kao primjer dat je jedan od novih oblika organizacije, Web Paukova mreža.
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    KOMPARACIJA EMISIJA CO2 ZA SNABDIJEVAČKE LANCE GORIVIMA OD DRVNE BIOMASE I UGLJA
    (Mašinski fakultet Istočno Sarajevo, Univerzitet u Istočnom Sarajevu, 2016) Mrkić, Maja Bosančić; Vasković, Srđan; Gvero, Petar; Halilović, Velid; Petrović, Daliborka; Marković, Biljana; Antunović, Ranko
    Potrošnja fosilnih goriva za aktiviranje mehanizacije za prikuplјanje, transport i preradu biomase u neku vrstu čvrstih goriva stvara određenu količinu uglјen – dioksida (CO2) koja se emituje u atmosferu. S druge strane ako se posmatra jedan snabdijevački lanac energijom iz fosilnog goriva (uglja) tada imamo isto sličnu situaciju što se tiče emisija za aktivaciju mehanizacije. Međutim, ključna razlika je u tome što sagorijevanje biomase u nekom postrojenju tretira se kao CO2 neutralno, dok se kod sagorijevanja uglja uzima ekvivalentna vrijednost emisije CO2 jer se u pitanju fosilno gorivo. Ovaj rad vrši komparaciju emisija koje se pojavljuju u ova dva tipa energetskih lanca.
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    KORIŠĆENJE INFORMACIONIH TEHNOLOGIJA U SEKTORU MALIH I MIKRO PREDUZEĆA
    (Elektrotehnički fakultet, Univerzitet u Istočnom Sarajevu, 2011) Medaković, Vlado; Vasković, Srđan
    Ovaj rad opisuje značaj informacionih tehnologija u pogledu poslovanja malih i mikro preduzeća u Republici Srpskoj. Evropska povelja za mala preduzeća, koja je obavezna za sve države članice Evropske Unije, države kandidate za članstvo u Evropsku Uniju i države Zapadnog Balkana, ističe deset područja koja su značajna za poboljšanje poslovnog okruženja za mala preduzeća. Među tih deset područja nalazi se i unapređenje on – line pristupa, odnosno korišćenje informacionih tehnologija. Istraživanje je imalo cilj da pokaže postoji li mogućnost elektronke komunikacije malih i mikro preduzeća sa sektorom institucionalne infrastrukture i na kom su nivou.
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    Multi-Criteria Optimization Concept for the Selection of Optimal Solid Fuels Supply Chain from Wooden Biomass
    (Sveučilište u Zagrebu Fakultet šumarstva i drvne tehnologi, 2015) Vasković, Srđan; Halilović, Velid; Gvero, Petar; Medaković, Vlado; Musić, Jusuf
    Production of solid fuels from wooden biomass is defined with appropriate energy chain of supply. Production procedure of solid fuels from wooden biomass, starting with technology for gathering wood residues and residues from logging up by the system of fuel production (system for milling, crushing, chopping, drying and pressing of wood residues), represents the energy chain of supply of solid fuel from biomass. Every single energy chain of supply and production of certain form of solid fuel from wooden biomass can be uniquely defined with three general criteria. These criteria are: energy efficiency of production, economy of production and environmental criteria. Efficiency of production is the relation of overall energy consumption per 1 kWh of heating value of produced fuel. When we talk about the economical aspect of production of solid fuels we take into account all production costs per 1 kWh of heating value of biofuel produced. Forest biomass is scattered and the need for its collection and transport require certain consumption of fossil fuel. Consumption of fossil fuel is needed to run mechanization to collect, transport and prepare biomass. Consumption of fossil fuels causes the emission of GHG. Ecological criteria for the estimation of production process of bio energy can be defined as emission of GHG per 1 kWh of heating value of produced fuel. Besides general criteria to estimate the quality of production of energy from biomass, there are specific criteria. Specific criteria regarding several characteristics are tightly related to applied technologies, potentials and barriers during the use of biomass. This paper analyzes only specific investment in selected chain of energy supply. The paper mathematically describes four characteristic cases of solid biofuel production from wooden biomass. These cases are: production of wooden chips from forest biomass with mobile chipper, production of wooden chips from wooden residues transported from sawmill to processing terminal, production of wooden briquette from mill residues transported into briquette factory, production of wooden pellet from mill residues transported into pellet factory. For overall ranking of energy chain of wooden biomass supply and selection of optimum variant, multicriteria optimization and VIKOR method is used.
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    MULTI–CRITERIA DECISION MODELING OF THE OPTIMAL COMBINATION FOR ENERGY SUPPLY SCENARIO: TEST MODEL FOR DANISH ENERGY SECTOR DATA
    (University Politehnica Timisoara, Faculty of Engineering Hunedoara, 2022) Mrkić, Maja Bosančić; Vasković, Srđan; Gvero, Petar
    With the development of renewable energy sources, the energy sector is in a constant process of transition. This is mostly due to the increasing share of renewable energy sources in the total percentage of energy needs. The main issue in finding a solution to replace the use of fossil fuels is what methods and approaches are used to design present and future optimal energy scenarios for countries, regions and local communities in strategic terms. This problem certainly depends on several factors and to get an answer to this question it is necessary to define a list of criteria that will describe existing and future energy scenarios. In order to find the optimal variant of the scenario in which both renewable and non–renewable energy sources will be included, it is necessary to use MCDM methods. In this paper, the VIKOR method was used to search for the optimal value of the energy mix scenario, while the Entropy method and the AHP method were used to define the weights of the optimization criteria. As reference data for testing the developed mathematical model to search the optimal combination of energy mix, data related to the Danish energy sector for the reference year 2015 were used as a demonstration.
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    ODREĐIVANJE TEŽINA KRITERIJUMA U PROCESIMA OPTIMIZACIJE ENERGETSKIH LANACA GORIVA BAZIRANIH NA DRVNOJ BIOMASI
    (Mašinski fakultet Istočno Sarajevo, Univerzitet u Istočnom Sarajevu, 2022) Vasković, Srđan; Gvero, Petar; Simić, Stojan; Krunić, Gojko; Halilović, Velid; Popović, Slavenko; Mrkić, Maja Bosančić
    Vrednovanje procesa proizvodnje energije iz različitih resursa predstavlja kompleksan zadatak. Taj zadatak mora uzeti u obzir različite tehnologije, manje ili veće proizvodne i investicione troškove, štetne uticaje na životnu sredinu (obnovljivi ili fosilni izvori energije), zatim energetske specifikacije posmatranih lanaca snabdijevanja gorivima i energijom. Višekriterijumska analiza i optimizacija je metodologija koja se bavi u opštem slučaju vrednovanjem skupova različitih alternativa. Kao takva, ova metodologija je idealna za pronalaženje optimalnih varijanti snabdijebanja energijom za usvojeni set kriterijuma prema kojima se vrši proces optimizacije. Za izbor optimalne varijante potrebno je ustanoviti adekvatne težine kriterijuma iz postojećeg skupa alternativa. Postoje različite metode za izbor težinskih faktora koje su uglavnom svedene na subjektivne i objektivne metode ili njihovu kombinaciju. U ovom radu koristiće se objektivna Metoda Entropije za određivanje težina kriterijuma za proces višekriterijumske optimizacije i njen uticaj na izbor optimalnog lanca snabdijevanja u odnosu na varijantu ujednačenih težinskih koeficijenata. Razlog za njenu primjenu se svodi na objektivnost prilikom donošenja odluka i isključivanje donosioca odluke iz tog procesa.