Calin Neamtu - Academia.edu (original) (raw)

Papers by Calin Neamtu

International Journal of Environmental Research and Public Health

This paper addresses the degree of readiness of manufacturing companies in the well-defined area ... more This paper addresses the degree of readiness of manufacturing companies in the well-defined area of Transylvania, Romania for tackling the challenges of the low-carbon economy (LCE) in view of the ambitious goals of the European Union. The presented survey aims to provide a better understanding about the management and reduction in the carbon footprint among production companies in Romania, as this sector is not usually included official strategies or studies. One hundred and three companies, selected based on voluntary sampling responses, were investigated using a 40-item questionnaire. The survey was applied to the manufacturing sector, including automotive, furniture production, and metal processing domains, which are locally representative and a good approximation of what small- and medium-sized firms look like across the EU, thus furnishing a good view of what takes place in other countries as well. The results obtained were analyzed using univariate descriptive statistics, mul...

Computer Modeling and Intelligent Systems

The paper is devoted to the development of the refined numerical and mathematical models of rotor... more The paper is devoted to the development of the refined numerical and mathematical models of rotor dynamics for high-performance turbomachines. These models consider the nonlinear regression dependencies between the radial stiffness of bearing supports and rotor speed of the shaft. As a result of the comprehensive application of the proposed approach, the algorithms of identification of the stiffness parameters of the bearing supports were proposed based on the critical frequencies of the rotor system. Additionally, the methodology for estimating the system of initial imbalances by the related displacements of the rotor axis in the correction and calculation cross-sections was improved. The proposed approaches based on the comprehensive application of the CAE software and computational intelligence systems allow conducting the modal and harmonic analysis and realizing the virtual balancing with the significant decrease of the preparatory and machine times without the loss of relative accuracy. Additionally, the developed mathematical models of free and forced oscillations of rotor systems were implemented as a program code of the operating files "Critical frequencies of the rotor" and "Forces oscillations of the rotors" within the computer algebra system that allows improving the dynamic balancing procedure in order to estimate the system of initial imbalances. The high accuracy of the proposed approach is confirmed by the verification of dynamic deflections of the rotor axis by the system of residual imbalances in accordance with the norms of vibration reliability.

Analytical Letters

The wooden Straja Church represents an interesting historical monument from Transylvania that sti... more The wooden Straja Church represents an interesting historical monument from Transylvania that still retains the original popular religious paintings with various degrees of degradation. This paper aims to present the scientific investigation results about the materials and methods used by the painter and his son for both restoration and conservation purposes, and also to enrich the knowledge regarding the work of this author in particular and Transylvanian historical religious art in general. The investigations were performed by means of X-ray fluorescence (XRF) spectroscopy, destructive and nondestructive Fourier transform infrared (FTIR) spectroscopy, and differential scanning calorimetry (DSC).

ACTA TECHNICA NAPOCENSIS - Series: APPLIED MATHEMATICS, MECHANICS, and ENGINEERING, Apr 8, 2021

This paper presents the design of an interior panel of a door for a small electric car intended f... more This paper presents the design of an interior panel of a door for a small electric car intended for urban traffic. The design incorporates a display that replaces the mirror, the ambient light in the storage compartment is activated automatically by a proximity sensor, and the whole panel can be made entirely out of carbon fiber or in combination with plastic parts/components.

Annales d'Université "Valahia" Târgovişte. Section d'Archéologie et d'Histoire, 2011

This paper aims to mark some of the possible applications of the engineering CAD software in the ... more This paper aims to mark some of the possible applications of the engineering CAD software in the field of archeology. The archaeological information, which is usually stored in classical format, can be digitized in 3D by using CAD software. The result of this process can be used for multiple purposes: conservation, dissemination, research, etc.

Journal of Ancient History and Archaeology, 2018

The paper presents a digital restoration methodology of a historical monument starting from the r... more The paper presents a digital restoration methodology of a historical monument starting from the results of a terrestrial scan done in situ. The paper describes the steps to be followed to achieve a digital restoration whose results can be validated in the virtual environment and then used in an interactive virtual reality application.

Symmetry, 2022

Following cardiac surgery, patients experience difficulties with the rehabilitation process, ofte... more Following cardiac surgery, patients experience difficulties with the rehabilitation process, often finding it difficult, and therefore lack the motivation for rehabilitation activities. As the number of people aged 65 and over will rise by 207 percent globally by 2050, the need for cardiac rehabilitation will significantly increase, as this is the main population to experience heart problems. To address this challenge, this paper proposes a new robotic exoskeleton concept with 12 DoFs (6 DoFs on each arm), with a symmetrical structure for the upper limbs, to be used in the early rehabilitation of cardiac patients after open-heart surgery. The electromechanical design (geometric, kinematic, and dynamic model), the control architecture, and the VR-based operating module of the robotic exoskeleton are presented. To solve the problem of the high degree of complexity regarding the CardioVR-ReTone kinematic and dynamic model, the iterative algorithm, kinetic energy, and generalized forces...

Applied Sciences, 2021

The wooden churches from Transylvania, Romania, are a unique and representative cultural heritage... more The wooden churches from Transylvania, Romania, are a unique and representative cultural heritage asset for rural communities, both in terms of architecture and the style of painting that defines them as monuments of national heritage. These churches are in danger of degradation because rural communities are beginning to abandon them for various motives (e.g., they are too small, are expensive to maintain, or are being replaced by modern churches, built of stone and modern materials). The reason behind their accelerated degradation is that they are covered with shingles that need to be periodically changed and repaired to prevent water from reaching the inner painting layer, a process that is, in many cases, ignored. Imperial gates are the symbol of these churches and separate the nave from the narthex. They are made entirely out of wood and were sculpted and painted manually by skilled craftsmen and still represent the central element of these churches, in terms of art and aestheti...

The paper presents the design stages of an electric car seat using the Design Thinking methodology

Molds for plastic injection are complex products with many components that require careful design... more Molds for plastic injection are complex products with many components that require careful design of the components of the subassemblies. The injection process of the plastic components is complex, with many variables that require adjustment of the process parameters in accordance with the mold and injected material. The paper proposes using Failure Mode and Effect Analysis in order to identify the situations in which a mold for plastic injection may produce scrap components. Key words : Mold design, Failure mode and effect analysis, mold optimization

CONSTANTIN MARUTOIU1, IOAN BRATU2*, ANA MARIA BUDU3, GHEORGHE SANTA1, OLIVIA FLORENA MARUTOIU1, C... more CONSTANTIN MARUTOIU1, IOAN BRATU2*, ANA MARIA BUDU3, GHEORGHE SANTA1, OLIVIA FLORENA MARUTOIU1, CALIN NEAMTU4, CLAUDIU TANASELIA5, IRINA KACSO2, IRINA CRINA ANCA SANDU6* 1 Babes-Bolyai University of Cluj-Napoca, Faculty of Orthodox Theology, Nicolae Ivan Str, 400609, Cluj-Napoca, Romania 2 National Institute for Research and Development of Isotopic and Molecular Technologies, 67-103 Donat, 400293, Cluj-Napoca, Romania 3 Alexandru Ioan Cuza University of Iasi, Faculty of Geography and Geology, 22 Carol I, Blvd., 700506 Iasi, Romania 4 Technical University Cluj-Napoca, 28 Memorandumului Str., 400114, Cluj Napoca, Romania 5 INCDO-INOE 2000 Research Institute for Analytical Instrumentation, 67 Donath Str., 400293, Cluj Napoca, Romania 6 Universidade de Evora, Laboratorio HERCULES, Palacio do Vimioso, Largo Marques de Marialva, 8, 7000-809, Evora, Portugal

http://www.revistadechimie.ro 1739 The wooden church under the patronage of the Archangels St. Mi... more http://www.revistadechimie.ro 1739 The wooden church under the patronage of the Archangels St. Michael and Gabriel in Sînmihaiu-Almasului, Salaj County (fig. 1), was built in the Eighteen century, probably not long before being painted. The interior painting was carried out by the painter as shown by the inscription on the right side of the iconostasis ... priest Andrei Toma, painted by Pop Ioan, 1794, January 20 [1]. Based on an older reading of the votive inscription on the left side of the iconostasis (fig. 2), the year 1778 is mentioned as the edification date of the church [2]. The entire structure is constructed from oak, with the large slopes of the roof, which descends steeply toward the altar, having a tower with an open pavilion on sculpted arches at the entrance. The porch is placed on three sides, the north, the south and the west, respecting the sculpted decoration of the pavilion. The painting was made, according to the votive inscription in the year 1794 by the itiner...

Proceedings of the International Symposium for Production Research 2018, 2018

The world of standardized management systems is traversing exciting changes with the publishing o... more The world of standardized management systems is traversing exciting changes with the publishing of the long-awaited ISO standard for occupational health and safety, ISO 45001. It comes to join ISO 9001 and ISO 14001 to form a trio of highly compatible best practice references of interest for many companies that want to become more competitive, especially from the manufacturing sector. For the past at least 20 years there have been many debates and studies on how to best go about using these standards together to set up an integrated management system. Of course, things seem easier now, but together with the benefits, there are also challenges to manage and some are quite significant. This paper discusses the implications of reaching this milestone and presents the results of a focus-group made among production oriented companies, that was aimed at probing the stakeholder community regarding its positioning in the new context. The focus is on the impact of the new regulations upon creating or upgrading an integrated management system, where relationships among components are the key to a successful implementation and to obtaining results.

JOURNAL OF ANCIENT HISTORY AND ARCHAEOLOGY, 2020

The process of documenting cultural heritage digitally has emerged with the recent technological ... more The process of documenting cultural heritage digitally has emerged with the recent technological developments. One of the direct consequences of using digital devices to promote cultural heritage is to educate the endusers and to exceed their initial expectations regarding their interaction and engagement with cultural heritage assets. Creativity is encouraged and stimulated by technology; as a result, cultural heritage domain must use technologies and tools from various domains such as engineering (3D scanning), gaming industry (VR headsets), digital marketing (interactive screens) to create interactive exhibitions. These tools can be paired with classical cultural heritage exhibition methods to attract, engage and support end-users more efficiently and effectively by creating unprecedented interactive. For this endeavor more than 560 artifacts have been digitized, the monuments and the fortress have been digitally reconstructed and integrated in digital applications that were combined with classical museum exhibition methods. By doing so, the paper also brings contributions concerning the methodologies used for deploying state of the art scanning and digitizing technologies. The main motivation was to bring classic exhibition techniques to modern times and to attract the young audiences to museums, thus identifying how they can be more engaged, involved and educated within the mixed museum spaces.

DEStech Transactions on Engineering and Technology Research, 2018

The present study highlights a methodology to approach complex decision-making regarding manufact... more The present study highlights a methodology to approach complex decision-making regarding manufacturing systems upgrading in the furniture industry, with application for an innovative company that has developed a smart product concept. The relationship between intelligent products and intelligent production is addressed from the point of view of existing approaches and then new directions are explored by means of successive correlations with the help of the Cause and Effect matrix, starting from expert opinions. The correlations identified between the expected decision influence factors and the designed product subsystems and projected processes, respectively, ensures that the planning of the transition to smart manufacturing can be made in a justified and well-thought manner. Also, adequate technologies are recommended for the most important processes based on a success forecasting analysis.

Journal of Minerals and Materials Characterization and Engineering, 2020

The investigation of the painting materials (pigments, binders and varnish) of Agarbiciu wooden c... more The investigation of the painting materials (pigments, binders and varnish) of Agarbiciu wooden church painted walls was done by employing both nondestructive (XRF and reflection FTIR spectroscopy for pigments) and destructive methods (FTIR spectroscopy and GC-MS spectrometry for pigments and binders). The digital restoration of the interior of the wooden church was done using the physical-chemical composition of the painting layer, a metadata set that describes the timeline, detailed photographic documentation and the 3D scanned interior of the church.

IFMBE Proceedings, 2014

ABSTRACT This paper aims to purpose an open, low-cost alternative to the existing health monitori... more ABSTRACT This paper aims to purpose an open, low-cost alternative to the existing health monitoring devices, without compromising key aspects such as accuracy, portability or communication features. Initial testing showed that it is possible to adapt the same features of a dedicated device, while keeping the versatility of a dedicated prototyping platform. Furthermore, the advantages introduced by the third generation LEGO EV3 platform will improve the results, especially for time sensitive measurements like EKG or NIBP.

Applied Mechanics and Materials, 2015

In terms of the development of 3D printers we can say that in the first stage of evolution the hu... more In terms of the development of 3D printers we can say that in the first stage of evolution the huge majority of them were able to print 3D using 3 axis numerically controlled. Currently there are several types of printers that can print in 4 and 5-axis developed using classical solutions (portal or parallel structure). Another direction of development is the combination of 3D printers and traditional manufacturing equipment, with an already existing commercial solution (Hermle MPA 40) that combines milling and MPA technology (Metal Powder-Application). This paper presents a hybrid equipment that can be placed in the specific additive manufacturing category, combining milling operations (4 axis) and turning with 3D printing using FDM technology. The machine uses stepper motors for driving kinematic axes, a DC motor (16 000 rev / min) to drive the main shaft of the mill and a three-phase motor for turning. The software used for milling and turning is Mach3, while MatterControl is used...

IFMBE Proceedings, 2014

ABSTRACT This paper presents a methodology for determining the initial diameter of the explanted ... more ABSTRACT This paper presents a methodology for determining the initial diameter of the explanted hip prosthesis based on scanning/measuring using coordinate measuring machines (CMM) and CAD processing of the obtained data. ISO 14242- 2:2000 shows two methods for determining wear of hip joint: gravimetric and measuring using CMMs. Only the second method (measuring using a CMM) can provide information regarding the position and the geometry of the wear print. Using CMMs to determine the hip joint’s wear with no “prewear” data involves finding the initial diameter of the prosthesis and then comparing the ideal surface with the real one which was determined using the explained scanning procedure. Most times there is no accurate measurement of the prosthesis before implantation to determine the real surface of the prosthesis. The presented methodology involves scanning the sphere so that it can calculate the deviation of the scanned points compared to a theoretical circle determined using CAD or numerical methods (roundness deviation). The scanning of the prosthesis or of a sphere can be done using at least three strategies: one of them offers the possibility of scanning complete circles and the other two only allow the scanning of arcs ( 12 or 14 of a complete circle’s circumference). The strategy enables the use of scan points for determine the deviation from circularity. Items that have a significant deviation from the nominal circle are the removed in a CAD program using for this purpose the roundness error map. The remaining points are used to calculate the sphere’s diameter and the center will then be taken as a reference to determine the area of the prosthesis that has wear.

Quality - Access to Success

International Journal of Environmental Research and Public Health

This paper addresses the degree of readiness of manufacturing companies in the well-defined area ... more This paper addresses the degree of readiness of manufacturing companies in the well-defined area of Transylvania, Romania for tackling the challenges of the low-carbon economy (LCE) in view of the ambitious goals of the European Union. The presented survey aims to provide a better understanding about the management and reduction in the carbon footprint among production companies in Romania, as this sector is not usually included official strategies or studies. One hundred and three companies, selected based on voluntary sampling responses, were investigated using a 40-item questionnaire. The survey was applied to the manufacturing sector, including automotive, furniture production, and metal processing domains, which are locally representative and a good approximation of what small- and medium-sized firms look like across the EU, thus furnishing a good view of what takes place in other countries as well. The results obtained were analyzed using univariate descriptive statistics, mul...

Computer Modeling and Intelligent Systems

The paper is devoted to the development of the refined numerical and mathematical models of rotor... more The paper is devoted to the development of the refined numerical and mathematical models of rotor dynamics for high-performance turbomachines. These models consider the nonlinear regression dependencies between the radial stiffness of bearing supports and rotor speed of the shaft. As a result of the comprehensive application of the proposed approach, the algorithms of identification of the stiffness parameters of the bearing supports were proposed based on the critical frequencies of the rotor system. Additionally, the methodology for estimating the system of initial imbalances by the related displacements of the rotor axis in the correction and calculation cross-sections was improved. The proposed approaches based on the comprehensive application of the CAE software and computational intelligence systems allow conducting the modal and harmonic analysis and realizing the virtual balancing with the significant decrease of the preparatory and machine times without the loss of relative accuracy. Additionally, the developed mathematical models of free and forced oscillations of rotor systems were implemented as a program code of the operating files "Critical frequencies of the rotor" and "Forces oscillations of the rotors" within the computer algebra system that allows improving the dynamic balancing procedure in order to estimate the system of initial imbalances. The high accuracy of the proposed approach is confirmed by the verification of dynamic deflections of the rotor axis by the system of residual imbalances in accordance with the norms of vibration reliability.

Analytical Letters

The wooden Straja Church represents an interesting historical monument from Transylvania that sti... more The wooden Straja Church represents an interesting historical monument from Transylvania that still retains the original popular religious paintings with various degrees of degradation. This paper aims to present the scientific investigation results about the materials and methods used by the painter and his son for both restoration and conservation purposes, and also to enrich the knowledge regarding the work of this author in particular and Transylvanian historical religious art in general. The investigations were performed by means of X-ray fluorescence (XRF) spectroscopy, destructive and nondestructive Fourier transform infrared (FTIR) spectroscopy, and differential scanning calorimetry (DSC).

ACTA TECHNICA NAPOCENSIS - Series: APPLIED MATHEMATICS, MECHANICS, and ENGINEERING, Apr 8, 2021

This paper presents the design of an interior panel of a door for a small electric car intended f... more This paper presents the design of an interior panel of a door for a small electric car intended for urban traffic. The design incorporates a display that replaces the mirror, the ambient light in the storage compartment is activated automatically by a proximity sensor, and the whole panel can be made entirely out of carbon fiber or in combination with plastic parts/components.

Annales d'Université "Valahia" Târgovişte. Section d'Archéologie et d'Histoire, 2011

This paper aims to mark some of the possible applications of the engineering CAD software in the ... more This paper aims to mark some of the possible applications of the engineering CAD software in the field of archeology. The archaeological information, which is usually stored in classical format, can be digitized in 3D by using CAD software. The result of this process can be used for multiple purposes: conservation, dissemination, research, etc.

Journal of Ancient History and Archaeology, 2018

The paper presents a digital restoration methodology of a historical monument starting from the r... more The paper presents a digital restoration methodology of a historical monument starting from the results of a terrestrial scan done in situ. The paper describes the steps to be followed to achieve a digital restoration whose results can be validated in the virtual environment and then used in an interactive virtual reality application.

Symmetry, 2022

Following cardiac surgery, patients experience difficulties with the rehabilitation process, ofte... more Following cardiac surgery, patients experience difficulties with the rehabilitation process, often finding it difficult, and therefore lack the motivation for rehabilitation activities. As the number of people aged 65 and over will rise by 207 percent globally by 2050, the need for cardiac rehabilitation will significantly increase, as this is the main population to experience heart problems. To address this challenge, this paper proposes a new robotic exoskeleton concept with 12 DoFs (6 DoFs on each arm), with a symmetrical structure for the upper limbs, to be used in the early rehabilitation of cardiac patients after open-heart surgery. The electromechanical design (geometric, kinematic, and dynamic model), the control architecture, and the VR-based operating module of the robotic exoskeleton are presented. To solve the problem of the high degree of complexity regarding the CardioVR-ReTone kinematic and dynamic model, the iterative algorithm, kinetic energy, and generalized forces...

Applied Sciences, 2021

The wooden churches from Transylvania, Romania, are a unique and representative cultural heritage... more The wooden churches from Transylvania, Romania, are a unique and representative cultural heritage asset for rural communities, both in terms of architecture and the style of painting that defines them as monuments of national heritage. These churches are in danger of degradation because rural communities are beginning to abandon them for various motives (e.g., they are too small, are expensive to maintain, or are being replaced by modern churches, built of stone and modern materials). The reason behind their accelerated degradation is that they are covered with shingles that need to be periodically changed and repaired to prevent water from reaching the inner painting layer, a process that is, in many cases, ignored. Imperial gates are the symbol of these churches and separate the nave from the narthex. They are made entirely out of wood and were sculpted and painted manually by skilled craftsmen and still represent the central element of these churches, in terms of art and aestheti...

The paper presents the design stages of an electric car seat using the Design Thinking methodology

Molds for plastic injection are complex products with many components that require careful design... more Molds for plastic injection are complex products with many components that require careful design of the components of the subassemblies. The injection process of the plastic components is complex, with many variables that require adjustment of the process parameters in accordance with the mold and injected material. The paper proposes using Failure Mode and Effect Analysis in order to identify the situations in which a mold for plastic injection may produce scrap components. Key words : Mold design, Failure mode and effect analysis, mold optimization

CONSTANTIN MARUTOIU1, IOAN BRATU2*, ANA MARIA BUDU3, GHEORGHE SANTA1, OLIVIA FLORENA MARUTOIU1, C... more CONSTANTIN MARUTOIU1, IOAN BRATU2*, ANA MARIA BUDU3, GHEORGHE SANTA1, OLIVIA FLORENA MARUTOIU1, CALIN NEAMTU4, CLAUDIU TANASELIA5, IRINA KACSO2, IRINA CRINA ANCA SANDU6* 1 Babes-Bolyai University of Cluj-Napoca, Faculty of Orthodox Theology, Nicolae Ivan Str, 400609, Cluj-Napoca, Romania 2 National Institute for Research and Development of Isotopic and Molecular Technologies, 67-103 Donat, 400293, Cluj-Napoca, Romania 3 Alexandru Ioan Cuza University of Iasi, Faculty of Geography and Geology, 22 Carol I, Blvd., 700506 Iasi, Romania 4 Technical University Cluj-Napoca, 28 Memorandumului Str., 400114, Cluj Napoca, Romania 5 INCDO-INOE 2000 Research Institute for Analytical Instrumentation, 67 Donath Str., 400293, Cluj Napoca, Romania 6 Universidade de Evora, Laboratorio HERCULES, Palacio do Vimioso, Largo Marques de Marialva, 8, 7000-809, Evora, Portugal

http://www.revistadechimie.ro 1739 The wooden church under the patronage of the Archangels St. Mi... more http://www.revistadechimie.ro 1739 The wooden church under the patronage of the Archangels St. Michael and Gabriel in Sînmihaiu-Almasului, Salaj County (fig. 1), was built in the Eighteen century, probably not long before being painted. The interior painting was carried out by the painter as shown by the inscription on the right side of the iconostasis ... priest Andrei Toma, painted by Pop Ioan, 1794, January 20 [1]. Based on an older reading of the votive inscription on the left side of the iconostasis (fig. 2), the year 1778 is mentioned as the edification date of the church [2]. The entire structure is constructed from oak, with the large slopes of the roof, which descends steeply toward the altar, having a tower with an open pavilion on sculpted arches at the entrance. The porch is placed on three sides, the north, the south and the west, respecting the sculpted decoration of the pavilion. The painting was made, according to the votive inscription in the year 1794 by the itiner...

Proceedings of the International Symposium for Production Research 2018, 2018

The world of standardized management systems is traversing exciting changes with the publishing o... more The world of standardized management systems is traversing exciting changes with the publishing of the long-awaited ISO standard for occupational health and safety, ISO 45001. It comes to join ISO 9001 and ISO 14001 to form a trio of highly compatible best practice references of interest for many companies that want to become more competitive, especially from the manufacturing sector. For the past at least 20 years there have been many debates and studies on how to best go about using these standards together to set up an integrated management system. Of course, things seem easier now, but together with the benefits, there are also challenges to manage and some are quite significant. This paper discusses the implications of reaching this milestone and presents the results of a focus-group made among production oriented companies, that was aimed at probing the stakeholder community regarding its positioning in the new context. The focus is on the impact of the new regulations upon creating or upgrading an integrated management system, where relationships among components are the key to a successful implementation and to obtaining results.

JOURNAL OF ANCIENT HISTORY AND ARCHAEOLOGY, 2020

The process of documenting cultural heritage digitally has emerged with the recent technological ... more The process of documenting cultural heritage digitally has emerged with the recent technological developments. One of the direct consequences of using digital devices to promote cultural heritage is to educate the endusers and to exceed their initial expectations regarding their interaction and engagement with cultural heritage assets. Creativity is encouraged and stimulated by technology; as a result, cultural heritage domain must use technologies and tools from various domains such as engineering (3D scanning), gaming industry (VR headsets), digital marketing (interactive screens) to create interactive exhibitions. These tools can be paired with classical cultural heritage exhibition methods to attract, engage and support end-users more efficiently and effectively by creating unprecedented interactive. For this endeavor more than 560 artifacts have been digitized, the monuments and the fortress have been digitally reconstructed and integrated in digital applications that were combined with classical museum exhibition methods. By doing so, the paper also brings contributions concerning the methodologies used for deploying state of the art scanning and digitizing technologies. The main motivation was to bring classic exhibition techniques to modern times and to attract the young audiences to museums, thus identifying how they can be more engaged, involved and educated within the mixed museum spaces.

DEStech Transactions on Engineering and Technology Research, 2018

The present study highlights a methodology to approach complex decision-making regarding manufact... more The present study highlights a methodology to approach complex decision-making regarding manufacturing systems upgrading in the furniture industry, with application for an innovative company that has developed a smart product concept. The relationship between intelligent products and intelligent production is addressed from the point of view of existing approaches and then new directions are explored by means of successive correlations with the help of the Cause and Effect matrix, starting from expert opinions. The correlations identified between the expected decision influence factors and the designed product subsystems and projected processes, respectively, ensures that the planning of the transition to smart manufacturing can be made in a justified and well-thought manner. Also, adequate technologies are recommended for the most important processes based on a success forecasting analysis.

Journal of Minerals and Materials Characterization and Engineering, 2020

The investigation of the painting materials (pigments, binders and varnish) of Agarbiciu wooden c... more The investigation of the painting materials (pigments, binders and varnish) of Agarbiciu wooden church painted walls was done by employing both nondestructive (XRF and reflection FTIR spectroscopy for pigments) and destructive methods (FTIR spectroscopy and GC-MS spectrometry for pigments and binders). The digital restoration of the interior of the wooden church was done using the physical-chemical composition of the painting layer, a metadata set that describes the timeline, detailed photographic documentation and the 3D scanned interior of the church.

IFMBE Proceedings, 2014

ABSTRACT This paper aims to purpose an open, low-cost alternative to the existing health monitori... more ABSTRACT This paper aims to purpose an open, low-cost alternative to the existing health monitoring devices, without compromising key aspects such as accuracy, portability or communication features. Initial testing showed that it is possible to adapt the same features of a dedicated device, while keeping the versatility of a dedicated prototyping platform. Furthermore, the advantages introduced by the third generation LEGO EV3 platform will improve the results, especially for time sensitive measurements like EKG or NIBP.

Applied Mechanics and Materials, 2015

In terms of the development of 3D printers we can say that in the first stage of evolution the hu... more In terms of the development of 3D printers we can say that in the first stage of evolution the huge majority of them were able to print 3D using 3 axis numerically controlled. Currently there are several types of printers that can print in 4 and 5-axis developed using classical solutions (portal or parallel structure). Another direction of development is the combination of 3D printers and traditional manufacturing equipment, with an already existing commercial solution (Hermle MPA 40) that combines milling and MPA technology (Metal Powder-Application). This paper presents a hybrid equipment that can be placed in the specific additive manufacturing category, combining milling operations (4 axis) and turning with 3D printing using FDM technology. The machine uses stepper motors for driving kinematic axes, a DC motor (16 000 rev / min) to drive the main shaft of the mill and a three-phase motor for turning. The software used for milling and turning is Mach3, while MatterControl is used...

IFMBE Proceedings, 2014

ABSTRACT This paper presents a methodology for determining the initial diameter of the explanted ... more ABSTRACT This paper presents a methodology for determining the initial diameter of the explanted hip prosthesis based on scanning/measuring using coordinate measuring machines (CMM) and CAD processing of the obtained data. ISO 14242- 2:2000 shows two methods for determining wear of hip joint: gravimetric and measuring using CMMs. Only the second method (measuring using a CMM) can provide information regarding the position and the geometry of the wear print. Using CMMs to determine the hip joint’s wear with no “prewear” data involves finding the initial diameter of the prosthesis and then comparing the ideal surface with the real one which was determined using the explained scanning procedure. Most times there is no accurate measurement of the prosthesis before implantation to determine the real surface of the prosthesis. The presented methodology involves scanning the sphere so that it can calculate the deviation of the scanned points compared to a theoretical circle determined using CAD or numerical methods (roundness deviation). The scanning of the prosthesis or of a sphere can be done using at least three strategies: one of them offers the possibility of scanning complete circles and the other two only allow the scanning of arcs ( 12 or 14 of a complete circle’s circumference). The strategy enables the use of scan points for determine the deviation from circularity. Items that have a significant deviation from the nominal circle are the removed in a CAD program using for this purpose the roundness error map. The remaining points are used to calculate the sphere’s diameter and the center will then be taken as a reference to determine the area of the prosthesis that has wear.

Quality - Access to Success