TY  - JOUR
AU  - Barcelo, Ernest
AU  - Dimić-Mišić, Katarina
AU  - Imani, Monir
AU  - Spasojević Brkić, Vesna
AU  - Hummel, Michael
AU  - Gane, Patrick
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5867
AB  - Nowadays, fossil fuels are used in a clearly unsustainable way that can bring potentially catastrophic consequences. Electricity is currently delivered to end users by generation and energy transmission companies. Previous research shows that the development of modern circular economy sets a need for the re-orientation of socio and economic development of decentralized systems, including energy basis. In addition to being ecological, the use of renewable energy sources also has economic significance by contributing to energy independence. Citizens, industries, local and national authorities become interconnected within emerging novel renewable energy sourcing communities, through which they establish trade of energy and, most importantly, models of investing and reshaping the distribution of renewable energy. The modern portfolio management of renewable energy networking is aiming toward decentralized systems of trade, where the consumer becomes a producer (prosumer) within the network, itself managed by users. Excess energy produced in the micro-grid nets within the over-arching national and transnational energy grid should be accounted for and managed with blockchain technology for financial and structural security. The decentralization of the energy market requires the establishment of strict norms that will regulate the market and taxation of profits arising. The extensive literature review on blockchain in the energy sector reflects a very pragmatic and narrow approach to the topic, although it is evident that the distribution of energy within the blockchain would enable economic development through reducing cost and ensuring more secure energy trade. Blockchain technology embeds the related digital codes, in which information will be visible to all, but also secured from hacking and duplicating. However, there are challenges to this paradigm, not least the energy consumption of the extensive nodal mesh required to perform the necessary protocols. This paper aims to provide an overview of the application of blockchain technology and the need for the development of the regulatory system and of potential solutions to the challenges posed. By undertaking an energy consumption analysis of blockchain implementation from first electronic principles, which has not been constructed before in the literature, this paper’s conclusion stresses the future demand for reducing energy consumption and considers the latest findings in the quantum coupling of light signals as a potential for solving the enormous ledger duplication structure problem.
PB  - MDPI
T2  - Sustainability
T1  - Regulatory Paradigm and Challenge for Blockchain Integration of Decentralized Systems: Example—Renewable Energy Grids
SP  - 2571
VL  - 15 (3)
DO  - 10.3390/su15032571
ER  - 

@article{
author = "Barcelo, Ernest and Dimić-Mišić, Katarina and Imani, Monir and Spasojević Brkić, Vesna and Hummel, Michael and Gane, Patrick",
year = "2023",
abstract = "Nowadays, fossil fuels are used in a clearly unsustainable way that can bring potentially catastrophic consequences. Electricity is currently delivered to end users by generation and energy transmission companies. Previous research shows that the development of modern circular economy sets a need for the re-orientation of socio and economic development of decentralized systems, including energy basis. In addition to being ecological, the use of renewable energy sources also has economic significance by contributing to energy independence. Citizens, industries, local and national authorities become interconnected within emerging novel renewable energy sourcing communities, through which they establish trade of energy and, most importantly, models of investing and reshaping the distribution of renewable energy. The modern portfolio management of renewable energy networking is aiming toward decentralized systems of trade, where the consumer becomes a producer (prosumer) within the network, itself managed by users. Excess energy produced in the micro-grid nets within the over-arching national and transnational energy grid should be accounted for and managed with blockchain technology for financial and structural security. The decentralization of the energy market requires the establishment of strict norms that will regulate the market and taxation of profits arising. The extensive literature review on blockchain in the energy sector reflects a very pragmatic and narrow approach to the topic, although it is evident that the distribution of energy within the blockchain would enable economic development through reducing cost and ensuring more secure energy trade. Blockchain technology embeds the related digital codes, in which information will be visible to all, but also secured from hacking and duplicating. However, there are challenges to this paradigm, not least the energy consumption of the extensive nodal mesh required to perform the necessary protocols. This paper aims to provide an overview of the application of blockchain technology and the need for the development of the regulatory system and of potential solutions to the challenges posed. By undertaking an energy consumption analysis of blockchain implementation from first electronic principles, which has not been constructed before in the literature, this paper’s conclusion stresses the future demand for reducing energy consumption and considers the latest findings in the quantum coupling of light signals as a potential for solving the enormous ledger duplication structure problem.",
publisher = "MDPI",
journal = "Sustainability",
title = "Regulatory Paradigm and Challenge for Blockchain Integration of Decentralized Systems: Example—Renewable Energy Grids",
pages = "2571",
volume = "15 (3)",
doi = "10.3390/su15032571"
}

Barcelo, E., Dimić-Mišić, K., Imani, M., Spasojević Brkić, V., Hummel, M.,& Gane, P.. (2023). Regulatory Paradigm and Challenge for Blockchain Integration of Decentralized Systems: Example—Renewable Energy Grids. in Sustainability
MDPI., 15 (3), 2571.
https://doi.org/10.3390/su15032571

Barcelo E, Dimić-Mišić K, Imani M, Spasojević Brkić V, Hummel M, Gane P. Regulatory Paradigm and Challenge for Blockchain Integration of Decentralized Systems: Example—Renewable Energy Grids. in Sustainability. 2023;15 (3):2571.
doi:10.3390/su15032571 .

Barcelo, Ernest, Dimić-Mišić, Katarina, Imani, Monir, Spasojević Brkić, Vesna, Hummel, Michael, Gane, Patrick, "Regulatory Paradigm and Challenge for Blockchain Integration of Decentralized Systems: Example—Renewable Energy Grids" in Sustainability, 15 (3) (2023):2571,
https://doi.org/10.3390/su15032571 . .

TY  - JOUR
AU  - Brkić, Aleksandar
AU  - Misita, Mirjana
AU  - Spasojević Brkić, Vesna
AU  - Golubović, Tamara
AU  - Papić, Neda
AU  - Perišić, Martina
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6323
AB  - According to available literature, safety at work and productivity of cranes are a necessary and insufficiently researched topic. Both research directions are closely related because they depend on the number and type of stoppages that occur during operation of these construction machines. The focus of research should be on identifying the stoppages that can have fatal consequences for employees on-site, or unintended consequences in terms of production loss, means of work, or environment. In the present research, an attempt is made to create a methodology for identification, analysis, assessment, classification, and calculation of stoppage risk in cranes (classified by categories and causes). Criteria used for analysis, assessment, and calculation of stoppage risk: degree of stoppage danger, frequency of stoppage classified according to stoppage categories/causes, and downtime according to the adopted classification. Experimental research on a sample of 1,091 stoppages recorded on several cranes over a longer time interval has confirmed the hypothesis of generating a 3-criterion matrix for stoppage risk assessment sensitive enough to prioritise key crane stoppage in terms of risk. Results of experimental research indicate mechanical downtime of 16.22 %, a frequency 45.35 % in downtime, and RPN number 80, at hazard level 10. Selectively, according to the cause of stoppage, the results indicate that the hoisting brake (6.48 % downtime at hazard level 10; 2.14 % stoppage frequency) and hoist gear/tooth breakage (5.29 % downtime at hazard level 10; 3.58 % stoppage frequency) are key mechanical causes of stoppages and crane risk generators. By mitigating the given risks, it is possible to improve safety and increase productivity.
AB  - Prema dostupnoj literaturi, bezbednost u radu i produktivnost dizalica je potrebna i nedovoljno proučena oblast. Oba pravca istraživanja su u bliskoj vezi jer zavise od broja i tipa zastoja koji se događaju u toku rada ovih mašinskih konstrukcija. Predmet istraživanja treba da bude u identifikaciji ovih zastoja, koji mogu imati fatalni ishod po zaposlene na terenu, ili nepredviđene posledice u smislu proizvodnih gubitaka, radnih sredstava, ili na okolinu. U radu je predstavljena izrada metodologije za identifikaciju, analizu, procenu, klasifikaciju i proračun rizika zastoja (sa klasifikacijom prema kategoriji i uzroku) kod dizalica. Kriterijumi upotrebljeni za analizu, procenu i proračun rizika zastoja su: stepen opasnosti zastoja, frekvencija zastoja sa klasifikacijom prema kategorijama/uzrocima zastoja, kao i vreme prekida, prema usvojenoj klasifikaciji. Eksperimentalno istraživanje na uzorku od 1091 zastoja, zabeleženih kod nekoliko dizalica tokom dužeg perioda potvrđuje hipotezu o generisanju 3-kriterijumske matrice za procenu rizika zastoja, dovoljno osetljivom, kako bi se dao prioritet ključnim zastojima kod dizalice s obzirom na rizik. Rezultati eksperimentalnog istraživanja pokazuju period mehaničkih prekida rada sa procentom 16.22 % i frekvencijom 45.35 % u vremenu prekida, sa brojem RPN od 80, pri nivou rizika 10. Selektivno, a prema uzroku zastoja, rezultati pokazuju da su: kočnice (6.48 % vreme prekida sa nivoom rizika 10; 2.14 % frekvencije zastoja), zatim otkazi prenosnika/zubaca (5.29 % vreme prekida, sa nivoom rizika 10; 3.58 % frekvencije zastoja), ključni mehanički uzročnici zastoja i generatori rizika dizalica. Ublažavanjem datih rizika, moguće je poboljšati bezbednost i povećati produktivnost.
PB  - Society for Structural Integrity and Life (DIVK)
T2  - Structural Integrity and Life
T1  - Crane stoppages risk assessment
T1  - Procena rizika zastoja dizalica
EP  - 346
IS  - 3
SP  - 339
VL  - 22
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6323
ER  - 

@article{
author = "Brkić, Aleksandar and Misita, Mirjana and Spasojević Brkić, Vesna and Golubović, Tamara and Papić, Neda and Perišić, Martina",
year = "2022",
abstract = "According to available literature, safety at work and productivity of cranes are a necessary and insufficiently researched topic. Both research directions are closely related because they depend on the number and type of stoppages that occur during operation of these construction machines. The focus of research should be on identifying the stoppages that can have fatal consequences for employees on-site, or unintended consequences in terms of production loss, means of work, or environment. In the present research, an attempt is made to create a methodology for identification, analysis, assessment, classification, and calculation of stoppage risk in cranes (classified by categories and causes). Criteria used for analysis, assessment, and calculation of stoppage risk: degree of stoppage danger, frequency of stoppage classified according to stoppage categories/causes, and downtime according to the adopted classification. Experimental research on a sample of 1,091 stoppages recorded on several cranes over a longer time interval has confirmed the hypothesis of generating a 3-criterion matrix for stoppage risk assessment sensitive enough to prioritise key crane stoppage in terms of risk. Results of experimental research indicate mechanical downtime of 16.22 %, a frequency 45.35 % in downtime, and RPN number 80, at hazard level 10. Selectively, according to the cause of stoppage, the results indicate that the hoisting brake (6.48 % downtime at hazard level 10; 2.14 % stoppage frequency) and hoist gear/tooth breakage (5.29 % downtime at hazard level 10; 3.58 % stoppage frequency) are key mechanical causes of stoppages and crane risk generators. By mitigating the given risks, it is possible to improve safety and increase productivity., Prema dostupnoj literaturi, bezbednost u radu i produktivnost dizalica je potrebna i nedovoljno proučena oblast. Oba pravca istraživanja su u bliskoj vezi jer zavise od broja i tipa zastoja koji se događaju u toku rada ovih mašinskih konstrukcija. Predmet istraživanja treba da bude u identifikaciji ovih zastoja, koji mogu imati fatalni ishod po zaposlene na terenu, ili nepredviđene posledice u smislu proizvodnih gubitaka, radnih sredstava, ili na okolinu. U radu je predstavljena izrada metodologije za identifikaciju, analizu, procenu, klasifikaciju i proračun rizika zastoja (sa klasifikacijom prema kategoriji i uzroku) kod dizalica. Kriterijumi upotrebljeni za analizu, procenu i proračun rizika zastoja su: stepen opasnosti zastoja, frekvencija zastoja sa klasifikacijom prema kategorijama/uzrocima zastoja, kao i vreme prekida, prema usvojenoj klasifikaciji. Eksperimentalno istraživanje na uzorku od 1091 zastoja, zabeleženih kod nekoliko dizalica tokom dužeg perioda potvrđuje hipotezu o generisanju 3-kriterijumske matrice za procenu rizika zastoja, dovoljno osetljivom, kako bi se dao prioritet ključnim zastojima kod dizalice s obzirom na rizik. Rezultati eksperimentalnog istraživanja pokazuju period mehaničkih prekida rada sa procentom 16.22 % i frekvencijom 45.35 % u vremenu prekida, sa brojem RPN od 80, pri nivou rizika 10. Selektivno, a prema uzroku zastoja, rezultati pokazuju da su: kočnice (6.48 % vreme prekida sa nivoom rizika 10; 2.14 % frekvencije zastoja), zatim otkazi prenosnika/zubaca (5.29 % vreme prekida, sa nivoom rizika 10; 3.58 % frekvencije zastoja), ključni mehanički uzročnici zastoja i generatori rizika dizalica. Ublažavanjem datih rizika, moguće je poboljšati bezbednost i povećati produktivnost.",
publisher = "Society for Structural Integrity and Life (DIVK)",
journal = "Structural Integrity and Life",
title = "Crane stoppages risk assessment, Procena rizika zastoja dizalica",
pages = "346-339",
number = "3",
volume = "22",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6323"
}

Brkić, A., Misita, M., Spasojević Brkić, V., Golubović, T., Papić, N.,& Perišić, M.. (2022). Crane stoppages risk assessment. in Structural Integrity and Life
Society for Structural Integrity and Life (DIVK)., 22(3), 339-346.
https://hdl.handle.net/21.15107/rcub_technorep_6323

Brkić A, Misita M, Spasojević Brkić V, Golubović T, Papić N, Perišić M. Crane stoppages risk assessment. in Structural Integrity and Life. 2022;22(3):339-346.
https://hdl.handle.net/21.15107/rcub_technorep_6323 .

Brkić, Aleksandar, Misita, Mirjana, Spasojević Brkić, Vesna, Golubović, Tamara, Papić, Neda, Perišić, Martina, "Crane stoppages risk assessment" in Structural Integrity and Life, 22, no. 3 (2022):339-346,
https://hdl.handle.net/21.15107/rcub_technorep_6323 .

TY  - JOUR
AU  - Dondur, Nikola
AU  - Spasojević-Brkić, Vesna
AU  - Omić, Snežana
AU  - Milović, Ljubica
AU  - Sedmak, Tamara
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1995
AB  - Differences in total factor productivity of privatised and newly-founded private companies in Serbia are empirically estimated in this paper. On the panel data from a sample of 900 firms in three regions - Vojvodina, Central Serbia and Belgrade, it is found that majority foreign owned companies, as well as export-oriented and newly-founded businesses which did not undergo the process of ownership transformation recorded higher productivity than the average productivity in these regions. Regional inequality in companies' performance elasticity to foreign capital, exports and market concentration is also empirically proved.
PB  - Editura Stiintifica Fmr, Bucharest
T2  - Metalurgia International
T1  - Productivity after ownership transformation-serbian case
EP  - 57
IS  - 6
SP  - 50
VL  - 17
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1995
ER  - 

@article{
author = "Dondur, Nikola and Spasojević-Brkić, Vesna and Omić, Snežana and Milović, Ljubica and Sedmak, Tamara",
year = "2012",
abstract = "Differences in total factor productivity of privatised and newly-founded private companies in Serbia are empirically estimated in this paper. On the panel data from a sample of 900 firms in three regions - Vojvodina, Central Serbia and Belgrade, it is found that majority foreign owned companies, as well as export-oriented and newly-founded businesses which did not undergo the process of ownership transformation recorded higher productivity than the average productivity in these regions. Regional inequality in companies' performance elasticity to foreign capital, exports and market concentration is also empirically proved.",
publisher = "Editura Stiintifica Fmr, Bucharest",
journal = "Metalurgia International",
title = "Productivity after ownership transformation-serbian case",
pages = "57-50",
number = "6",
volume = "17",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1995"
}

Dondur, N., Spasojević-Brkić, V., Omić, S., Milović, L.,& Sedmak, T.. (2012). Productivity after ownership transformation-serbian case. in Metalurgia International
Editura Stiintifica Fmr, Bucharest., 17(6), 50-57.
https://hdl.handle.net/21.15107/rcub_technorep_1995

Dondur N, Spasojević-Brkić V, Omić S, Milović L, Sedmak T. Productivity after ownership transformation-serbian case. in Metalurgia International. 2012;17(6):50-57.
https://hdl.handle.net/21.15107/rcub_technorep_1995 .

Dondur, Nikola, Spasojević-Brkić, Vesna, Omić, Snežana, Milović, Ljubica, Sedmak, Tamara, "Productivity after ownership transformation-serbian case" in Metalurgia International, 17, no. 6 (2012):50-57,
https://hdl.handle.net/21.15107/rcub_technorep_1995 .