TY  - JOUR
AU  - Vorkapić, Miloš
AU  - Mladenović, Ivana
AU  - Ivanov, Toni
AU  - Kovačević, Aleksandar
AU  - Mohammad Sakib, Hasan
AU  - Aleksandar, Simonović
AU  - Trajković, Isaak
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5363
AB  - Five series of specimens with two different print orientations (−45/45 and 0/90) and two print layer thicknesses (0.1 and 0.2 mm) were made. In total 60 specimens with 100% filament infill were made. One specimen series (20 pieces) was isolated as a reference or thermally untreated. Before the thermal treatment (annealing), two specimen moulding methods were used: NaCl powder (granulation 63 mm: 20 pieces) and Calcium Sulphate (Gypsum: 20 pieces). During the annealing, specimens immersed in NaCl powder were heated in a drying oven to the filament melting point (for PLA: 200°C, with a duration interval of 30 min), while the treatment of the heated specimens in gypsum was performed at a temperature of around 190°C, with duration interval of 3 h with the observed temperature inside the mould of about 100°C. An ultrasonic bath and a drying oven were used in the gypsum treatment. Temperature measurement and control during both annealing treatments were performed using a thermal imaging camera, while the temperature control inside the drying oven was performed using a digital thermometer. After treatment, the specimens in the moulds were cooled at room temperature, and the dimensions of annealing and untreated specimens were controlled. Surface morphology was characterised using scanning electron microscopy (SEM). The SEM analysis reveals improved internal structure after heat treatment of the PLA specimens. These results show that the investigated specimens after heat treatments had better structural properties than the referent specimens. Tensile testing on a universal testing machine in compliance with the ASTM D638 standard was also performed. The referent PLA specimen with −45/45 and layer thickness of 0.1 mm had the highest tensile stress value (64.08 MPa) while the specimen with minimal tensile stress value before fracture was 0/90, 0.2 mm (54.81 MPa). Heat treatment in gypsum showed the most significant increase in strength with −45/45 (0.1 mm) being the strongest (71.66 MPa) while the strongest specimen treated in sodium chloride was −45/45 (0.1 mm) with maximum tensile stress of 70.08 MPa. The mechanical characteristics of the PLA were characterised using the Vickers microhardness tester. The PLA microhardness value was calculated according to standards ASTM E384 and ISO 6507. The referent PLA specimen with −45/45 (0.2 mm) orientation shows the maximal microhardness value (125 MPa), and the minimal microhardness value was observed for the 0/90 (0.1 mm) orientation specimens (108 MPa). The heat treatment specimens in gypsum have a better hardness (185 MPa) than those treated in gypsum (165 MPa), with microhardness increasing by about 12%. The essence of the work is reflected in the additional filament processing to achieve a better structural and mechanical performance of the materials and reduce the anisotropy that is characteristic of 3D printing.
PB  - SAGE
T2  - Advances in Mechanical Engineering
T1  - Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds
VL  - 14
IS  - 8
SP  - 1
EP  - 15
DO  - 10.1177/16878132221120737
ER  - 

@article{
author = "Vorkapić, Miloš and Mladenović, Ivana and Ivanov, Toni and Kovačević, Aleksandar and Mohammad Sakib, Hasan and Aleksandar, Simonović and Trajković, Isaak",
year = "2022",
abstract = "Five series of specimens with two different print orientations (−45/45 and 0/90) and two print layer thicknesses (0.1 and 0.2 mm) were made. In total 60 specimens with 100% filament infill were made. One specimen series (20 pieces) was isolated as a reference or thermally untreated. Before the thermal treatment (annealing), two specimen moulding methods were used: NaCl powder (granulation 63 mm: 20 pieces) and Calcium Sulphate (Gypsum: 20 pieces). During the annealing, specimens immersed in NaCl powder were heated in a drying oven to the filament melting point (for PLA: 200°C, with a duration interval of 30 min), while the treatment of the heated specimens in gypsum was performed at a temperature of around 190°C, with duration interval of 3 h with the observed temperature inside the mould of about 100°C. An ultrasonic bath and a drying oven were used in the gypsum treatment. Temperature measurement and control during both annealing treatments were performed using a thermal imaging camera, while the temperature control inside the drying oven was performed using a digital thermometer. After treatment, the specimens in the moulds were cooled at room temperature, and the dimensions of annealing and untreated specimens were controlled. Surface morphology was characterised using scanning electron microscopy (SEM). The SEM analysis reveals improved internal structure after heat treatment of the PLA specimens. These results show that the investigated specimens after heat treatments had better structural properties than the referent specimens. Tensile testing on a universal testing machine in compliance with the ASTM D638 standard was also performed. The referent PLA specimen with −45/45 and layer thickness of 0.1 mm had the highest tensile stress value (64.08 MPa) while the specimen with minimal tensile stress value before fracture was 0/90, 0.2 mm (54.81 MPa). Heat treatment in gypsum showed the most significant increase in strength with −45/45 (0.1 mm) being the strongest (71.66 MPa) while the strongest specimen treated in sodium chloride was −45/45 (0.1 mm) with maximum tensile stress of 70.08 MPa. The mechanical characteristics of the PLA were characterised using the Vickers microhardness tester. The PLA microhardness value was calculated according to standards ASTM E384 and ISO 6507. The referent PLA specimen with −45/45 (0.2 mm) orientation shows the maximal microhardness value (125 MPa), and the minimal microhardness value was observed for the 0/90 (0.1 mm) orientation specimens (108 MPa). The heat treatment specimens in gypsum have a better hardness (185 MPa) than those treated in gypsum (165 MPa), with microhardness increasing by about 12%. The essence of the work is reflected in the additional filament processing to achieve a better structural and mechanical performance of the materials and reduce the anisotropy that is characteristic of 3D printing.",
publisher = "SAGE",
journal = "Advances in Mechanical Engineering",
title = "Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds",
volume = "14",
number = "8",
pages = "1-15",
doi = "10.1177/16878132221120737"
}

Vorkapić, M., Mladenović, I., Ivanov, T., Kovačević, A., Mohammad Sakib, H., Aleksandar, S.,& Trajković, I.. (2022). Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds. in Advances in Mechanical Engineering
SAGE., 14(8), 1-15.
https://doi.org/10.1177/16878132221120737

Vorkapić M, Mladenović I, Ivanov T, Kovačević A, Mohammad Sakib H, Aleksandar S, Trajković I. Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds. in Advances in Mechanical Engineering. 2022;14(8):1-15.
doi:10.1177/16878132221120737 .

Vorkapić, Miloš, Mladenović, Ivana, Ivanov, Toni, Kovačević, Aleksandar, Mohammad Sakib, Hasan, Aleksandar, Simonović, Trajković, Isaak, "Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds" in Advances in Mechanical Engineering, 14, no. 8 (2022):1-15,
https://doi.org/10.1177/16878132221120737 . .

TY  - CONF
AU  - Vorkapić, Miloš
AU  - Mladenović, Ivana
AU  - Kovačević, Aleksandar
AU  - Baltić, Marija
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5662
AB  - Reverse engineering (RE) is a process that integrates additive technologies, while enabling finishing or modifications of an existing model, as well as the application of new ideas in design improvement. This approach leads to the reduction (or elimination) of certain steps of the product development process, and faster model digitization, with further improvements and optimization of parameters. The biggest challenge in the application of RE is the high-quality physical part reproduction with the best possible characteristics, while keeping the realization costs as low as possible. Especially in this segment additive technologies become increasingly important. In this work, RE is applied in order to fabricate a protective cover of a machine used in semiconductor production, based on the existing (damaged) physical sample. The protective cover is a part of a silicon wafer dicing saw (Micro Automation, Model 602M), and it is made of plastic. Due to the age and the long exploitation of the machine, the sample part was broken at one of its supports. Unfortunately, since the machine has become obsolete a long time ago, the spare parts cannot be found. In such cases, RE has an important role, and the fabrication of a new part would be almost unthinkable without the application of additive technology. The CAD model of the protective cover was defined based on the measured dimensions of the damaged part. The procedure is very convenient in cases when only a physical part (or a finished product) exists without technical documentation, or when the existing technical documentation is not in a digital form. We performed model optimization and load simulation on the supports for different materials. After digitization, the model manufacturing process started. The model was made of the thermoplastic polymer ABS on the 3D printer Wanhao Duplicator, type i3 plus, made in the People’s Republic of China. In this paper, we intended to illustrate the significance of the symbiosis of RE and the additive technology in the process of realization of parts/assemblies of an obsolete product with no spare parts available.
PB  - SIRAMM project - H2020-WIDESPREAD-2018-03 Project No. 857124, Horizon 2020
C3  - Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia
T1  - Link between reverse engineering and additive technology on the example of a model without technical documentation
SP  - 39
EP  - 39
UR  - https://hdl.handle.net/21.15107/rcub_cer_5662
ER  - 

@conference{
author = "Vorkapić, Miloš and Mladenović, Ivana and Kovačević, Aleksandar and Baltić, Marija",
year = "2021",
abstract = "Reverse engineering (RE) is a process that integrates additive technologies, while enabling finishing or modifications of an existing model, as well as the application of new ideas in design improvement. This approach leads to the reduction (or elimination) of certain steps of the product development process, and faster model digitization, with further improvements and optimization of parameters. The biggest challenge in the application of RE is the high-quality physical part reproduction with the best possible characteristics, while keeping the realization costs as low as possible. Especially in this segment additive technologies become increasingly important. In this work, RE is applied in order to fabricate a protective cover of a machine used in semiconductor production, based on the existing (damaged) physical sample. The protective cover is a part of a silicon wafer dicing saw (Micro Automation, Model 602M), and it is made of plastic. Due to the age and the long exploitation of the machine, the sample part was broken at one of its supports. Unfortunately, since the machine has become obsolete a long time ago, the spare parts cannot be found. In such cases, RE has an important role, and the fabrication of a new part would be almost unthinkable without the application of additive technology. The CAD model of the protective cover was defined based on the measured dimensions of the damaged part. The procedure is very convenient in cases when only a physical part (or a finished product) exists without technical documentation, or when the existing technical documentation is not in a digital form. We performed model optimization and load simulation on the supports for different materials. After digitization, the model manufacturing process started. The model was made of the thermoplastic polymer ABS on the 3D printer Wanhao Duplicator, type i3 plus, made in the People’s Republic of China. In this paper, we intended to illustrate the significance of the symbiosis of RE and the additive technology in the process of realization of parts/assemblies of an obsolete product with no spare parts available.",
publisher = "SIRAMM project - H2020-WIDESPREAD-2018-03 Project No. 857124, Horizon 2020",
journal = "Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia",
title = "Link between reverse engineering and additive technology on the example of a model without technical documentation",
pages = "39-39",
url = "https://hdl.handle.net/21.15107/rcub_cer_5662"
}

Vorkapić, M., Mladenović, I., Kovačević, A.,& Baltić, M.. (2021). Link between reverse engineering and additive technology on the example of a model without technical documentation. in Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia
SIRAMM project - H2020-WIDESPREAD-2018-03 Project No. 857124, Horizon 2020., 39-39.
https://hdl.handle.net/21.15107/rcub_cer_5662

Vorkapić M, Mladenović I, Kovačević A, Baltić M. Link between reverse engineering and additive technology on the example of a model without technical documentation. in Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia. 2021;:39-39.
https://hdl.handle.net/21.15107/rcub_cer_5662 .

Vorkapić, Miloš, Mladenović, Ivana, Kovačević, Aleksandar, Baltić, Marija, "Link between reverse engineering and additive technology on the example of a model without technical documentation" in Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia (2021):39-39,
https://hdl.handle.net/21.15107/rcub_cer_5662 .

TY  - CONF
AU  - Tanović, Dragoljub
AU  - Kovačević, Aleksandar
AU  - Vorkapić, Miloš
AU  - Vujović, Aleksandar
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5663
AB  - U radu prikazan je algoritam koji omogućava primenu 3D štampe u projektovanju ili modifikaciji proizvoda. Aditivna proizvodnja , ili tehnologija 3D štampe, podrazumeva izradu proizvoda složene geometrije u relativno malim količinama. 3D štampa omogućuje realizaciju modela prema digitalnom prikazu, a njena primena je ogromna u različitim proizvodnim granama. Glavne prednosti 3D štampe su: ušteda energije, smanjenje otpada, smanjenje upotrebe većeg broja alata, kao i optimizacija dizajna. Tehnologija 3D štampe radi na principu dodavanja materijala u slojevima. Model se formira od slojeva rastopljenog materijala koji se odmah hladi i očvršćava. Polazni materijal za izradu modela je polilaktična kiselina (PLA). Na mehaničke karakteristike realizovanog modela od PLA utiču različite promenljive kao što su: prečnik brizgaljke, debljina definisanog sloja, procentualna vrednost ispune,geometrija ispune, veličina uzorka, brzina punjenja i temperatura proizvodnje. Cilj ovog rada je da se prikaže algoritam kao deo procedure i aktivnosti kontrole pri realizaciji različitih modela. Time se projektantu daje mogućnost da realizuje nov proizvod, ispravi greške na postojećem proizvodu i na kraju modifikuje proizvod prema zahterima krajnjih korisnika.
PB  - Beograd : JUSK - Jedinstveno Udruženje Srbije za Kvalitet / Belgrade : UASQ - United Association of Serbia for Quality
C3  - Zbornik radova JUSK ICQ - XVII Međunarodna konvencija o kvalitetu 2021, 09-11/06/2021, Beograd, Srbija
T1  - Algoritam za primenu 3D štampe u projektovanju ili modifikaciji proizvoda
SP  - 94
EP  - 101
UR  - https://hdl.handle.net/21.15107/rcub_cer_5663
ER  - 

@conference{
author = "Tanović, Dragoljub and Kovačević, Aleksandar and Vorkapić, Miloš and Vujović, Aleksandar",
year = "2021",
abstract = "U radu prikazan je algoritam koji omogućava primenu 3D štampe u projektovanju ili modifikaciji proizvoda. Aditivna proizvodnja , ili tehnologija 3D štampe, podrazumeva izradu proizvoda složene geometrije u relativno malim količinama. 3D štampa omogućuje realizaciju modela prema digitalnom prikazu, a njena primena je ogromna u različitim proizvodnim granama. Glavne prednosti 3D štampe su: ušteda energije, smanjenje otpada, smanjenje upotrebe većeg broja alata, kao i optimizacija dizajna. Tehnologija 3D štampe radi na principu dodavanja materijala u slojevima. Model se formira od slojeva rastopljenog materijala koji se odmah hladi i očvršćava. Polazni materijal za izradu modela je polilaktična kiselina (PLA). Na mehaničke karakteristike realizovanog modela od PLA utiču različite promenljive kao što su: prečnik brizgaljke, debljina definisanog sloja, procentualna vrednost ispune,geometrija ispune, veličina uzorka, brzina punjenja i temperatura proizvodnje. Cilj ovog rada je da se prikaže algoritam kao deo procedure i aktivnosti kontrole pri realizaciji različitih modela. Time se projektantu daje mogućnost da realizuje nov proizvod, ispravi greške na postojećem proizvodu i na kraju modifikuje proizvod prema zahterima krajnjih korisnika.",
publisher = "Beograd : JUSK - Jedinstveno Udruženje Srbije za Kvalitet / Belgrade : UASQ - United Association of Serbia for Quality",
journal = "Zbornik radova JUSK ICQ - XVII Međunarodna konvencija o kvalitetu 2021, 09-11/06/2021, Beograd, Srbija",
title = "Algoritam za primenu 3D štampe u projektovanju ili modifikaciji proizvoda",
pages = "94-101",
url = "https://hdl.handle.net/21.15107/rcub_cer_5663"
}

Tanović, D., Kovačević, A., Vorkapić, M.,& Vujović, A.. (2021). Algoritam za primenu 3D štampe u projektovanju ili modifikaciji proizvoda. in Zbornik radova JUSK ICQ - XVII Međunarodna konvencija o kvalitetu 2021, 09-11/06/2021, Beograd, Srbija
Beograd : JUSK - Jedinstveno Udruženje Srbije za Kvalitet / Belgrade : UASQ - United Association of Serbia for Quality., 94-101.
https://hdl.handle.net/21.15107/rcub_cer_5663

Tanović D, Kovačević A, Vorkapić M, Vujović A. Algoritam za primenu 3D štampe u projektovanju ili modifikaciji proizvoda. in Zbornik radova JUSK ICQ - XVII Međunarodna konvencija o kvalitetu 2021, 09-11/06/2021, Beograd, Srbija. 2021;:94-101.
https://hdl.handle.net/21.15107/rcub_cer_5663 .

Tanović, Dragoljub, Kovačević, Aleksandar, Vorkapić, Miloš, Vujović, Aleksandar, "Algoritam za primenu 3D štampe u projektovanju ili modifikaciji proizvoda" in Zbornik radova JUSK ICQ - XVII Međunarodna konvencija o kvalitetu 2021, 09-11/06/2021, Beograd, Srbija (2021):94-101,
https://hdl.handle.net/21.15107/rcub_cer_5663 .

TY  - CONF
AU  - Simonović, Aleksandar
AU  - Kovačević, Aleksandar
AU  - Ivanov, Toni
AU  - Vorkapić, Miloš
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3919
AB  - The trend of wind turbine development has a special significance in the exploitation of renewable
energy sources. At higher altitudes, we have better wind energy utilization higher speed and
their conversion are achieved in the best possible use of wind turbines. The development of new technologies
opens space for a new generation of wind turbines with a 20MW rated power. In recent
years, various feasibility studies have shown that wind turbines with large rotor diameter and high
towers give positive shifts in the analysis of structural and aerodynamic parameters, with a focus on
reducing overall mass and damping vibrations due to the use of new materials. In this paper, the
evolution of high power wind turbines and an overview of the technological development of the basic
components of the turbine will be presented. Perspectives in the further development of wind turbines
with rated power above 20MW will be also considered.
AB  - Trend razvoja vetroturbina ima poseban značaj u eksploataciji obnovljivih izvora energije. Vetroturbine velikog prečnika rotora i visokih tornjeva sve se više razmatraju u istraživačkim i razvojnim centrima širom sveta. Upotrebom vetroturbina na većim visinama gde je brzina vetra znatno veća ostvaruje se mogućnost boljeg iskorišćenja ovog obnovljivog izvora energije. Razvoj novih tehnologija otvara mogućnost za novu generaciju vetroturbina snage preko 20 MW. U poslednjih nekoliko godina razne studije izvodljivosti su pokazale da koncept vetroturbine velikog prečnika rotora koji se nalazi na visokim tornju daje pozitivne rezultate sa aspekta analize strukturalnih i aerodinamičkih parametara. Posebna pažnja posvećena je smanjenju ukupne mase i prigušenju vibracija korišćenjem novih materijala. U ovom radu prezentovan je razvoj vetroturbina velike snage, dat je pregled tehnoloških mogućnosti u proizvodnji osnovnih komponenti kao i perspektiva za realizaciju vetroturbina snage preko 20 MW.
PB  - Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS, Beograd
C3  - 8th International Conference on Renewable Electrical Power Sources (8. Međunarodna konferencija o obnovljivim izvorima električne energije), ICREPS 2020, October 16, Belgrade, Serbia
T1  - Wind turbine beyond 20 MW – Technology perspective
SP  - 123
EP  - 134
UR  - https://hdl.handle.net/21.15107/rcub_cer_3919
ER  - 

@conference{
author = "Simonović, Aleksandar and Kovačević, Aleksandar and Ivanov, Toni and Vorkapić, Miloš",
year = "2020",
abstract = "The trend of wind turbine development has a special significance in the exploitation of renewable
energy sources. At higher altitudes, we have better wind energy utilization higher speed and
their conversion are achieved in the best possible use of wind turbines. The development of new technologies
opens space for a new generation of wind turbines with a 20MW rated power. In recent
years, various feasibility studies have shown that wind turbines with large rotor diameter and high
towers give positive shifts in the analysis of structural and aerodynamic parameters, with a focus on
reducing overall mass and damping vibrations due to the use of new materials. In this paper, the
evolution of high power wind turbines and an overview of the technological development of the basic
components of the turbine will be presented. Perspectives in the further development of wind turbines
with rated power above 20MW will be also considered., Trend razvoja vetroturbina ima poseban značaj u eksploataciji obnovljivih izvora energije. Vetroturbine velikog prečnika rotora i visokih tornjeva sve se više razmatraju u istraživačkim i razvojnim centrima širom sveta. Upotrebom vetroturbina na većim visinama gde je brzina vetra znatno veća ostvaruje se mogućnost boljeg iskorišćenja ovog obnovljivog izvora energije. Razvoj novih tehnologija otvara mogućnost za novu generaciju vetroturbina snage preko 20 MW. U poslednjih nekoliko godina razne studije izvodljivosti su pokazale da koncept vetroturbine velikog prečnika rotora koji se nalazi na visokim tornju daje pozitivne rezultate sa aspekta analize strukturalnih i aerodinamičkih parametara. Posebna pažnja posvećena je smanjenju ukupne mase i prigušenju vibracija korišćenjem novih materijala. U ovom radu prezentovan je razvoj vetroturbina velike snage, dat je pregled tehnoloških mogućnosti u proizvodnji osnovnih komponenti kao i perspektiva za realizaciju vetroturbina snage preko 20 MW.",
publisher = "Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS, Beograd",
journal = "8th International Conference on Renewable Electrical Power Sources (8. Međunarodna konferencija o obnovljivim izvorima električne energije), ICREPS 2020, October 16, Belgrade, Serbia",
title = "Wind turbine beyond 20 MW – Technology perspective",
pages = "123-134",
url = "https://hdl.handle.net/21.15107/rcub_cer_3919"
}

Simonović, A., Kovačević, A., Ivanov, T.,& Vorkapić, M.. (2020). Wind turbine beyond 20 MW – Technology perspective. in 8th International Conference on Renewable Electrical Power Sources (8. Međunarodna konferencija o obnovljivim izvorima električne energije), ICREPS 2020, October 16, Belgrade, Serbia
Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS, Beograd., 123-134.
https://hdl.handle.net/21.15107/rcub_cer_3919

Simonović A, Kovačević A, Ivanov T, Vorkapić M. Wind turbine beyond 20 MW – Technology perspective. in 8th International Conference on Renewable Electrical Power Sources (8. Međunarodna konferencija o obnovljivim izvorima električne energije), ICREPS 2020, October 16, Belgrade, Serbia. 2020;:123-134.
https://hdl.handle.net/21.15107/rcub_cer_3919 .

Simonović, Aleksandar, Kovačević, Aleksandar, Ivanov, Toni, Vorkapić, Miloš, "Wind turbine beyond 20 MW – Technology perspective" in 8th International Conference on Renewable Electrical Power Sources (8. Međunarodna konferencija o obnovljivim izvorima električne energije), ICREPS 2020, October 16, Belgrade, Serbia (2020):123-134,
https://hdl.handle.net/21.15107/rcub_cer_3919 .

TY  - CONF
AU  - Kovačević, Aleksandar
AU  - Ivanov, Toni
AU  - Simonović, Aleksandar
AU  - Vorkapić, Miloš
PY  - 2020
UR  - http://cent.mas.bg.ac.rs/jupiter/index.htm
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3904
AB  - Veoma veliki porast upotrebe 3D štampe u poslednje dve decenije posledica je niza benefita koje
ova proizvodna tehnologija nudi. U ovom radu analizirano je odstupanje geometrije štampanog modela u
odnosu na CAD model. Izrada eksperimentalnog modela izvršena je metodom fuzionog taloženja filamenta
(FDM) pri čemu je korišćen akrilonitril butadien stirol (ABS) materijal. Pokazano je kako se sa brojem
iteracija odstupanje geometrije 3D štampanih modela u odnosu na CAD model smanjuje. U zaključku je dat
pregled celokupnog procesa i preporuke u pogledu ograničenja upotrebe ove metode.
AB  - Large increase in the use of 3D printing or rapid prototyping in the last two decades is due to the many
benefits that this manufacturing technology offers. In this article geometry accuracy of 3D printed parts is analyzed.
For printing of the analyzed model Fused Deposition Modeling (FDM) method was employed. ABS material was used
to create the specimens. The measurement results have shown that the dimensional accuracy of printed parts increases
with the number of iterations. The overview of analyze and some recommendations in the sense of limitation in the
application of this method are given as a conclusion of this paper.
PB  - Uniiverzitet u Beogradu - Mašinski fakultet
C3  - Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference
T1  - Povećanje preciznosti izrade 3D štampanih delova primenom iterativne metode
SP  - 2.13
EP  - 2.19
UR  - https://hdl.handle.net/21.15107/rcub_cer_3904
ER  - 

@conference{
author = "Kovačević, Aleksandar and Ivanov, Toni and Simonović, Aleksandar and Vorkapić, Miloš",
year = "2020",
abstract = "Veoma veliki porast upotrebe 3D štampe u poslednje dve decenije posledica je niza benefita koje
ova proizvodna tehnologija nudi. U ovom radu analizirano je odstupanje geometrije štampanog modela u
odnosu na CAD model. Izrada eksperimentalnog modela izvršena je metodom fuzionog taloženja filamenta
(FDM) pri čemu je korišćen akrilonitril butadien stirol (ABS) materijal. Pokazano je kako se sa brojem
iteracija odstupanje geometrije 3D štampanih modela u odnosu na CAD model smanjuje. U zaključku je dat
pregled celokupnog procesa i preporuke u pogledu ograničenja upotrebe ove metode., Large increase in the use of 3D printing or rapid prototyping in the last two decades is due to the many
benefits that this manufacturing technology offers. In this article geometry accuracy of 3D printed parts is analyzed.
For printing of the analyzed model Fused Deposition Modeling (FDM) method was employed. ABS material was used
to create the specimens. The measurement results have shown that the dimensional accuracy of printed parts increases
with the number of iterations. The overview of analyze and some recommendations in the sense of limitation in the
application of this method are given as a conclusion of this paper.",
publisher = "Uniiverzitet u Beogradu - Mašinski fakultet",
journal = "Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference",
title = "Povećanje preciznosti izrade 3D štampanih delova primenom iterativne metode",
pages = "2.13-2.19",
url = "https://hdl.handle.net/21.15107/rcub_cer_3904"
}

Kovačević, A., Ivanov, T., Simonović, A.,& Vorkapić, M.. (2020). Povećanje preciznosti izrade 3D štampanih delova primenom iterativne metode. in Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference
Uniiverzitet u Beogradu - Mašinski fakultet., 2.13-2.19.
https://hdl.handle.net/21.15107/rcub_cer_3904

Kovačević A, Ivanov T, Simonović A, Vorkapić M. Povećanje preciznosti izrade 3D štampanih delova primenom iterativne metode. in Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference. 2020;:2.13-2.19.
https://hdl.handle.net/21.15107/rcub_cer_3904 .

Kovačević, Aleksandar, Ivanov, Toni, Simonović, Aleksandar, Vorkapić, Miloš, "Povećanje preciznosti izrade 3D štampanih delova primenom iterativne metode" in Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference (2020):2.13-2.19,
https://hdl.handle.net/21.15107/rcub_cer_3904 .

TY  - CONF
AU  - Hasan, Mohammad Sakib
AU  - Vorkapić, Miloš
AU  - Ivanov, Toni
AU  - Kovačević, Aleksandar
PY  - 2020
UR  - http://cent.mas.bg.ac.rs/jupiter/index.htm
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3903
AB  - U ovom radu, izvršena je analiza i predikcija brzina štampe u eksploatacionim uslovima. Postoje
odstupanja zadane brzine na štampaču od proračunate stvarne vrednosti. S tim u vezi, postoji i razlika u
vremenima izrade. Ovde je posmatrana brzina kao ravnomerno pravolinijsko kretanja brizgaljke. Zato, VNM je
poslužila za predikciju Vsr, sa promenom ulaznih parametara. Za rezultate predikcije brzine dobili smo
zadovoljavajuću vrednost regresionog koeficijenta 0.9999 sa ukupnom MAPE greškom koja iznosi 1,84%. Mreža bi
se mogla koristiti za obradu, predviđanje i optimizaciju prosečne brzine mlaznice i ostalih procesnih parametara.
AB  - In this paper, an analysis and printing speed prediction in exploitation conditions performed. There are set speed deviations of the on the printer from the calculated actual value. In this regard, there is also a difference in manufacturing times. Here, speed viewed as a uniform perpendicular nozzle motion. Therefore, the VNM used the Vsr prediction, with the input parameters changing. For the speed prediction results, we received a satisfactory regression coefficient value of 0.9999 with a total MAPE error of 1.84%. The network could be use for processing, prediction and, nozzle average speed optimization and other process parameters.
PB  - Uniiverzitet u Beogradu - Mašinski fakultet
C3  - Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference
T1  - Predikcija brzine na 3D štampaču primenom veštačkih neuronskih mreža
SP  - 2.7
EP  - 2.12
UR  - https://hdl.handle.net/21.15107/rcub_cer_3903
ER  - 

@conference{
author = "Hasan, Mohammad Sakib and Vorkapić, Miloš and Ivanov, Toni and Kovačević, Aleksandar",
year = "2020",
abstract = "U ovom radu, izvršena je analiza i predikcija brzina štampe u eksploatacionim uslovima. Postoje
odstupanja zadane brzine na štampaču od proračunate stvarne vrednosti. S tim u vezi, postoji i razlika u
vremenima izrade. Ovde je posmatrana brzina kao ravnomerno pravolinijsko kretanja brizgaljke. Zato, VNM je
poslužila za predikciju Vsr, sa promenom ulaznih parametara. Za rezultate predikcije brzine dobili smo
zadovoljavajuću vrednost regresionog koeficijenta 0.9999 sa ukupnom MAPE greškom koja iznosi 1,84%. Mreža bi
se mogla koristiti za obradu, predviđanje i optimizaciju prosečne brzine mlaznice i ostalih procesnih parametara., In this paper, an analysis and printing speed prediction in exploitation conditions performed. There are set speed deviations of the on the printer from the calculated actual value. In this regard, there is also a difference in manufacturing times. Here, speed viewed as a uniform perpendicular nozzle motion. Therefore, the VNM used the Vsr prediction, with the input parameters changing. For the speed prediction results, we received a satisfactory regression coefficient value of 0.9999 with a total MAPE error of 1.84%. The network could be use for processing, prediction and, nozzle average speed optimization and other process parameters.",
publisher = "Uniiverzitet u Beogradu - Mašinski fakultet",
journal = "Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference",
title = "Predikcija brzine na 3D štampaču primenom veštačkih neuronskih mreža",
pages = "2.7-2.12",
url = "https://hdl.handle.net/21.15107/rcub_cer_3903"
}

Hasan, M. S., Vorkapić, M., Ivanov, T.,& Kovačević, A.. (2020). Predikcija brzine na 3D štampaču primenom veštačkih neuronskih mreža. in Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference
Uniiverzitet u Beogradu - Mašinski fakultet., 2.7-2.12.
https://hdl.handle.net/21.15107/rcub_cer_3903

Hasan MS, Vorkapić M, Ivanov T, Kovačević A. Predikcija brzine na 3D štampaču primenom veštačkih neuronskih mreža. in Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference. 2020;:2.7-2.12.
https://hdl.handle.net/21.15107/rcub_cer_3903 .

Hasan, Mohammad Sakib, Vorkapić, Miloš, Ivanov, Toni, Kovačević, Aleksandar, "Predikcija brzine na 3D štampaču primenom veštačkih neuronskih mreža" in Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference (2020):2.7-2.12,
https://hdl.handle.net/21.15107/rcub_cer_3903 .

TY  - JOUR
AU  - Hasan, Mohammad Sakib
AU  - Ivanov, Toni
AU  - Vorkapić, Miloš
AU  - Simonović, Aleksandar
AU  - Daou, David
AU  - Kovačević, Aleksandar
AU  - Milovanović, Aleksa
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3722
AB  - Rapid innovations in 3D printing technology have allowed highly complex parts to be manufactured quickly and easily, particularly for prototyping purposes. Fused Deposition Modeling of thermoplastic materials is one of the most commonly used techniques in three-dimensional (3D) printing. The major aim of Fused Deposition Modeling (FDM) is to design and manufacture usable parts for fields such as engineering and medicine. Therefore, it is essential to investigate the mechanical properties of such FDM processed structures. One of the most commonly used materials currently on the market is Polylactic Acid (PLA). The main purpose of this paper is to investigate the effects of aging and heat treatment on the tensile properties of PLA printed test specimens. The tensile properties of parts manufactured by the 3D printer are influenced by various parameters such as extrusion temperature, infill density, building direction, layer height, etc. A total of 96 specimens were built by altering building orientation and layer height to estimate and compare the tensile properties of the printed parts. To investigate the aging effect, 30 of 96 specimens were printed 6 months before the tensile experiment. Half of both aged and new specimens were cured in an oven at 57.5 [˚C] for 3 hours while the other half endured no heat treatment. After the performed measurement, it can be concluded that heat treatment generally improves structural strength of the printed parts, while aging decreases it. However, these effects are highly dependent on the layer thickness and printing quality. The tensile test is conducted according to the ASTM D638 standard. The fractured samples were further characterized using an electron microscope.
PB  - Romania : Revista Chimie SRL
T2  - Materiale  Plastice
T1  - Impact of Aging Effect and Heat Treatment on the Tensile Properties of PLA (Poly Lactic Acid) Printed Parts
VL  - 57
IS  - 3
SP  - 147
EP  - 159
DO  - 10.37358/MP.20.3.5389
ER  - 

@article{
author = "Hasan, Mohammad Sakib and Ivanov, Toni and Vorkapić, Miloš and Simonović, Aleksandar and Daou, David and Kovačević, Aleksandar and Milovanović, Aleksa",
year = "2020",
abstract = "Rapid innovations in 3D printing technology have allowed highly complex parts to be manufactured quickly and easily, particularly for prototyping purposes. Fused Deposition Modeling of thermoplastic materials is one of the most commonly used techniques in three-dimensional (3D) printing. The major aim of Fused Deposition Modeling (FDM) is to design and manufacture usable parts for fields such as engineering and medicine. Therefore, it is essential to investigate the mechanical properties of such FDM processed structures. One of the most commonly used materials currently on the market is Polylactic Acid (PLA). The main purpose of this paper is to investigate the effects of aging and heat treatment on the tensile properties of PLA printed test specimens. The tensile properties of parts manufactured by the 3D printer are influenced by various parameters such as extrusion temperature, infill density, building direction, layer height, etc. A total of 96 specimens were built by altering building orientation and layer height to estimate and compare the tensile properties of the printed parts. To investigate the aging effect, 30 of 96 specimens were printed 6 months before the tensile experiment. Half of both aged and new specimens were cured in an oven at 57.5 [˚C] for 3 hours while the other half endured no heat treatment. After the performed measurement, it can be concluded that heat treatment generally improves structural strength of the printed parts, while aging decreases it. However, these effects are highly dependent on the layer thickness and printing quality. The tensile test is conducted according to the ASTM D638 standard. The fractured samples were further characterized using an electron microscope.",
publisher = "Romania : Revista Chimie SRL",
journal = "Materiale  Plastice",
title = "Impact of Aging Effect and Heat Treatment on the Tensile Properties of PLA (Poly Lactic Acid) Printed Parts",
volume = "57",
number = "3",
pages = "147-159",
doi = "10.37358/MP.20.3.5389"
}

Hasan, M. S., Ivanov, T., Vorkapić, M., Simonović, A., Daou, D., Kovačević, A.,& Milovanović, A.. (2020). Impact of Aging Effect and Heat Treatment on the Tensile Properties of PLA (Poly Lactic Acid) Printed Parts. in Materiale  Plastice
Romania : Revista Chimie SRL., 57(3), 147-159.
https://doi.org/10.37358/MP.20.3.5389

Hasan MS, Ivanov T, Vorkapić M, Simonović A, Daou D, Kovačević A, Milovanović A. Impact of Aging Effect and Heat Treatment on the Tensile Properties of PLA (Poly Lactic Acid) Printed Parts. in Materiale  Plastice. 2020;57(3):147-159.
doi:10.37358/MP.20.3.5389 .

Hasan, Mohammad Sakib, Ivanov, Toni, Vorkapić, Miloš, Simonović, Aleksandar, Daou, David, Kovačević, Aleksandar, Milovanović, Aleksa, "Impact of Aging Effect and Heat Treatment on the Tensile Properties of PLA (Poly Lactic Acid) Printed Parts" in Materiale  Plastice, 57, no. 3 (2020):147-159,
https://doi.org/10.37358/MP.20.3.5389 . .

TY  - CONF
AU  - Perić, Bojan
AU  - Simonović, Aleksandar
AU  - Kovačević, Aleksandar
AU  - Tanović, Dragoljub
AU  - Vorkapić, Miloš
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3913
AB  - The increasing size of wind turbine blades leads to various flow phenomena which are
influenced by aerodynamic design of blade. Detailed information of flow separation and wake
development are important for wind turbine blade designers to optimize blade design. In order to
obtain detailed information on the flow field, CFD (computational fluid dynamics) modeling is
the topic in many research studies.
In this paper aerodynamic analysis of the reference DTU 10 MW HAWT rotor using finite
volume method was done. Numerical simulations are realized in a commercial software package
ANSYS FLUENT. Flow field is modeled by Reynolds Averaged Navier-Stokes (RANS)
equations using transition SST viscous model. The pressure-based SIMPLEC pressure-velocity
coupling and 2nd order spatial discretization schemes were used for calculation. Obtained
numerical results for mechanical power, power coefficient, thrust, thrust coefficient, pressure
coefficient and relative velocity contours at rated wind speed were considered. The results were
compared with the reference results and conclusions were derived.
PB  - Belgrade, Serbia : Serbian Society of Mechanics
C3  - Proceedings of 7th International Congress of Serbian Society of Mechanics
T1  - Numerical analysis of aerodynamic performance of offshore wind turbine
SP  - 1
EP  - 8
UR  - https://hdl.handle.net/21.15107/rcub_cer_3913
ER  - 

@conference{
author = "Perić, Bojan and Simonović, Aleksandar and Kovačević, Aleksandar and Tanović, Dragoljub and Vorkapić, Miloš",
year = "2019",
abstract = "The increasing size of wind turbine blades leads to various flow phenomena which are
influenced by aerodynamic design of blade. Detailed information of flow separation and wake
development are important for wind turbine blade designers to optimize blade design. In order to
obtain detailed information on the flow field, CFD (computational fluid dynamics) modeling is
the topic in many research studies.
In this paper aerodynamic analysis of the reference DTU 10 MW HAWT rotor using finite
volume method was done. Numerical simulations are realized in a commercial software package
ANSYS FLUENT. Flow field is modeled by Reynolds Averaged Navier-Stokes (RANS)
equations using transition SST viscous model. The pressure-based SIMPLEC pressure-velocity
coupling and 2nd order spatial discretization schemes were used for calculation. Obtained
numerical results for mechanical power, power coefficient, thrust, thrust coefficient, pressure
coefficient and relative velocity contours at rated wind speed were considered. The results were
compared with the reference results and conclusions were derived.",
publisher = "Belgrade, Serbia : Serbian Society of Mechanics",
journal = "Proceedings of 7th International Congress of Serbian Society of Mechanics",
title = "Numerical analysis of aerodynamic performance of offshore wind turbine",
pages = "1-8",
url = "https://hdl.handle.net/21.15107/rcub_cer_3913"
}

Perić, B., Simonović, A., Kovačević, A., Tanović, D.,& Vorkapić, M.. (2019). Numerical analysis of aerodynamic performance of offshore wind turbine. in Proceedings of 7th International Congress of Serbian Society of Mechanics
Belgrade, Serbia : Serbian Society of Mechanics., 1-8.
https://hdl.handle.net/21.15107/rcub_cer_3913

Perić B, Simonović A, Kovačević A, Tanović D, Vorkapić M. Numerical analysis of aerodynamic performance of offshore wind turbine. in Proceedings of 7th International Congress of Serbian Society of Mechanics. 2019;:1-8.
https://hdl.handle.net/21.15107/rcub_cer_3913 .

Perić, Bojan, Simonović, Aleksandar, Kovačević, Aleksandar, Tanović, Dragoljub, Vorkapić, Miloš, "Numerical analysis of aerodynamic performance of offshore wind turbine" in Proceedings of 7th International Congress of Serbian Society of Mechanics (2019):1-8,
https://hdl.handle.net/21.15107/rcub_cer_3913 .

TY  - JOUR
AU  - Vorkapić, Miloš
AU  - Bogetić, Srđan
AU  - Tanović, Dragoljub
AU  - Hasan, Mohammad Sakib
AU  - Kovačević, Aleksandar
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3470
AB  - In this paper, GAP analysis and 5S tool are applied in the case of realization of a compact pressure
transmitter. GAP analysis, combined with the 5S tool, can qualitatively indicate the critical points
in the manufacturing, assembly and quality control of a finished transmitter. Existing errors lead to
the appearance of possible risks in the realization of production processes, from the input of raw
materials to the assembly of the finished product. In order to eliminate the existing errors, the main
steps of the GAP analysis are described in detail. Guidelines are provided on how to improve the
workplace manufacturing process through certain improvements by applying all 5S elements.
According to the implemented action plan, the main causes of risk occurrence in the GAP analysis
were: human factor and processing technologies. The human factor was characterized by poor
control in the workplace (there is no discipline), poor training and incompetence of employees for
the given tasks. Processing technology involves obsolete machines, which can introduce deviations
of dimensions and tolerances from the prescribed values.
AB  - U ovom radu, analizirani su GAP analiza i 5S alat na primeru realizacije malogabaritnog transmitera pritiska. GAP analiza, u kombinaciji sa 5S alatom, može kvalitetno ukazuje na kritične tačke u procesu proizvodnje, sklapanja i kontrole gotovog transmitera. Postojeće greške dovode do pojave mogućih rizika u realizaciji proizvodnih procesa, od ulaza repromaterijala do sklapanja gotovog proizvoda. Analiza rizika, omogućava organizaciji da preuzme određene korake u prihvatanju ili smanjenju njegovog uticaja. 5S alat u GAP analizi pomaže da se rizična mesta srede i dovedu u funkcionalno stanje, sa što manje gubitaka (otpada). Zbog eliminacije postojećih grešaka, u radu su detaljno opisani glavni koraci GAP analize. Date su smernice kako da se unapredi proces proizvodnje na radnom mestu kroz određena poboljšanja primenom svih 5S elemenata. Prema sprovedenom akcionom planu konstatovano je da su glavni uzročnici pojave rizika u GAP analizi sledeći: ljudski faktor i tehnologije obrade. Ljudski faktor je okarakterisan slabom kontrolom na radnom mestu (ne postoji disciplina), slabom obukom i nekompetentnošću zaposlenih za propisano radno mesto. Tehnologija obrade podrazumeva tehnološki zastarele mašine i odstupanja mera i tolerancija od propisanih vrednosti
PB  - Zrenjanin: University of Novi Sad - 'Mihajlo Pupin' Technical Faculty
T2  - Journal of Engineering Management and Competitiveness (JEM)
T1  - 5S Elements as steps to bridge the gap in transmitter manufacturing process
T1  - 5S elementi kao koraci za premošćivanje procepa u procesu prozvodnje transmitera
VL  - 9
IS  - 2
SP  - 148
EP  - 158
DO  - 10.5937/jemc1902148V
ER  - 

@article{
author = "Vorkapić, Miloš and Bogetić, Srđan and Tanović, Dragoljub and Hasan, Mohammad Sakib and Kovačević, Aleksandar",
year = "2019",
abstract = "In this paper, GAP analysis and 5S tool are applied in the case of realization of a compact pressure
transmitter. GAP analysis, combined with the 5S tool, can qualitatively indicate the critical points
in the manufacturing, assembly and quality control of a finished transmitter. Existing errors lead to
the appearance of possible risks in the realization of production processes, from the input of raw
materials to the assembly of the finished product. In order to eliminate the existing errors, the main
steps of the GAP analysis are described in detail. Guidelines are provided on how to improve the
workplace manufacturing process through certain improvements by applying all 5S elements.
According to the implemented action plan, the main causes of risk occurrence in the GAP analysis
were: human factor and processing technologies. The human factor was characterized by poor
control in the workplace (there is no discipline), poor training and incompetence of employees for
the given tasks. Processing technology involves obsolete machines, which can introduce deviations
of dimensions and tolerances from the prescribed values., U ovom radu, analizirani su GAP analiza i 5S alat na primeru realizacije malogabaritnog transmitera pritiska. GAP analiza, u kombinaciji sa 5S alatom, može kvalitetno ukazuje na kritične tačke u procesu proizvodnje, sklapanja i kontrole gotovog transmitera. Postojeće greške dovode do pojave mogućih rizika u realizaciji proizvodnih procesa, od ulaza repromaterijala do sklapanja gotovog proizvoda. Analiza rizika, omogućava organizaciji da preuzme određene korake u prihvatanju ili smanjenju njegovog uticaja. 5S alat u GAP analizi pomaže da se rizična mesta srede i dovedu u funkcionalno stanje, sa što manje gubitaka (otpada). Zbog eliminacije postojećih grešaka, u radu su detaljno opisani glavni koraci GAP analize. Date su smernice kako da se unapredi proces proizvodnje na radnom mestu kroz određena poboljšanja primenom svih 5S elemenata. Prema sprovedenom akcionom planu konstatovano je da su glavni uzročnici pojave rizika u GAP analizi sledeći: ljudski faktor i tehnologije obrade. Ljudski faktor je okarakterisan slabom kontrolom na radnom mestu (ne postoji disciplina), slabom obukom i nekompetentnošću zaposlenih za propisano radno mesto. Tehnologija obrade podrazumeva tehnološki zastarele mašine i odstupanja mera i tolerancija od propisanih vrednosti",
publisher = "Zrenjanin: University of Novi Sad - 'Mihajlo Pupin' Technical Faculty",
journal = "Journal of Engineering Management and Competitiveness (JEM)",
title = "5S Elements as steps to bridge the gap in transmitter manufacturing process, 5S elementi kao koraci za premošćivanje procepa u procesu prozvodnje transmitera",
volume = "9",
number = "2",
pages = "148-158",
doi = "10.5937/jemc1902148V"
}

Vorkapić, M., Bogetić, S., Tanović, D., Hasan, M. S.,& Kovačević, A.. (2019). 5S Elements as steps to bridge the gap in transmitter manufacturing process. in Journal of Engineering Management and Competitiveness (JEM)
Zrenjanin: University of Novi Sad - 'Mihajlo Pupin' Technical Faculty., 9(2), 148-158.
https://doi.org/10.5937/jemc1902148V

Vorkapić M, Bogetić S, Tanović D, Hasan MS, Kovačević A. 5S Elements as steps to bridge the gap in transmitter manufacturing process. in Journal of Engineering Management and Competitiveness (JEM). 2019;9(2):148-158.
doi:10.5937/jemc1902148V .

Vorkapić, Miloš, Bogetić, Srđan, Tanović, Dragoljub, Hasan, Mohammad Sakib, Kovačević, Aleksandar, "5S Elements as steps to bridge the gap in transmitter manufacturing process" in Journal of Engineering Management and Competitiveness (JEM), 9, no. 2 (2019):148-158,
https://doi.org/10.5937/jemc1902148V . .