Călin Neamţu

• Professor
• Professor at Technical University of Cluj-Napoca

In the year 2021, a virtual reality training application has been developed, specifically for the Oculus Quest 2 headset, in order to allow the users to view and analyse 3D models for a wide variety of geometrical tolerances, tolerance zones and even the conformity condition and the datum features. This application allows the students to better und...

Recent advancement in digital technologies enabled the development of innovative and interactive museum exhibitions. These emerging technologies can be used to define unprecedented interactive experiences within museum exhibitions allowing users to interact with accurate digital replicas of the cultural heritage assets displayed within the real mus...

Wooden Churches from Romania represent the tangible part of the Christian tradition identity and wood crafting mastery from rural villages. Until the beginning of the 20th century, the Romanians created and manifested themselves mainly in a civilization of wood, of a richness, a variety, and a remarkable refinement, in which the wooden churches rea...

This paper presents a virtual reality application developed for engineering students aiming to help them develop their skills to correctly interpret the geometrical tolerances for orientation, like parallelism, perpendicularity and angularity, according to the latest Geometrical Product Specification (GPS) Standards. The previous studies focused on...

Composite materials are very often used in the manufacture of lightweight parts in the automotive industry, manufacturing of cost-efficient elements implies proper technology combined with a structural optimization of the material structure. The paper presents the manufacturing process, experimental and numerical analyses of the mechanical behavior...

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 mo...

Cultural heritage domain has started to adopt various modern technologies to improve their visitor’s user experience within various museum exhibitions. There are a wide variety of academic papers that present various workflow that enable the digitization of various cultural heritage assets, starting from small objects up to entire buildings and for...

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 end-users and to exceed their initial expectations regarding their interaction and engagement with cultural heritage assets. Creativity...

Sarmizegetusa Regia was included, together with the other five Dacian fortresses, on the List of UNESCO World Heritage Sites in 1999. They are a unique synthesis of external cultural influences and local traditions in terms of building techniques and overall, in the ancient military architecture, representing the grand expression of the civilisatio...

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 conservatio...

This paper is focused on highlighting the advantages of using modern augmented reality applications to support the widespread dissemination of Cultural Heritage assets. This kind of applications have the potential to improve the user experience when they are visualizing a hard cover printed book or catalogue. The main advantage of this solution is...

This paper presents the challenges encountered in elaborating two learning modules for the Erasmus+ project 2015-1-PL01-KA202-016875N “GEOMETRICAL PRODUCT SPECIFICATION (GPS) AND VERIFICATION AS TOOLBOX TO MEET UP-TO-DATE TECHNICAL REQUIREMENTS”. The ISO GPS standards define the language that allows expressing all requirements for the geometry of a...

In this article, the epoxy-based composites were developed by combining the short E-glass fibers into epoxy matrix. The fiber content in the composite was varied from 0.05 to 0.40 by weight fraction, and the variation of mechanical properties, such as tensile, flexural, impact, and hardness properties, in each case, were investigated. Chemical anal...

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, espe...

The fiber reinforced polymers (FRP) represent a group of materials with a very impressive development in the last time. There are used in different applications from aerospace to sports or medicine. Carbon fiber reinforced polymer (CFRP) has special properties and tend to replace traditional materials like steel, aluminum alloys or wood. Different...

One of the most beautiful elements of cultural heritage in Romanian villages is the Transylvanian wooden churches. Unfortunately, these heritage elements have experienced considerable deterioration. This paper presents the results of a project whose main goal was the scientific investigation of the Imperial Gates belonging to the wooden church in S...

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 exi...

The Fourier transform infrared spectra of Transylvanian pottery fragments from XVI-XVIII centuries and the identification of their vibrational frequencies and curve fitting of the 1400–800 cm−1 spectral massif have allowed to determine the chemical and mineralogical composition of the fragments and their firing temperature. A pottery vessel was res...

The paper aims to address, via an inter-disciplinary approach, the necessity of applying computer vision concepts to various fields of research, like the study of circular shaped, ancient historical artifacts. A series of hardware and software instruments were designed in an effort to assist the numismatist with complementary scientific knowledge a...

Integrated management systems (IMSs) can already be considered a proven tool to help companies cope with the challenges associated with staying competitive in the face of dynamic stakeholder requirements. The present paper proposes a new instrument designed to evaluate and communicate the maturity achieved by an integrated management system (IMS) f...

The polymeric reinforced composite materials (FRP) are a new materials group which have a lot of research reported in the last years. Our paper present the results obtained in case of use FRP for manufacturing an electric vehicle front hood in order for lightweight chassis and increase the autonomy. The design stage and 3D modelling of the mould, m...

In the last decade fiber-reinforced polymer (FRP) had a very impressive development. Due to its physical and mechanical properties, this material is used in many high-end domains such as: aerospace, aviation, automotive, medical, engineering or building constructions. In the last period FRP are being intensely used in the automotive industry especi...

The paper presents a methodology to create 3D digital and virtual artefacts in the field of archaeology using CAD software solution. The methodology includes the following steps: the digitalization process, the digital restoration and the dissemination process within a virtual environment. The resulted 3D digital artefacts have to be created in fil...

The paper presents a training system based on the use of virtual reality and 3D CAVE system dedicated to training people operating in Critical Structures. Specifics activities of a critical infrastructure does not allow for staff training in real conditions without putting them in danger. Such simulation in virtual reality environments of crisis si...

The performance of any image recognition method used in computer based vision is primary related to the image quality. While the Koson coin images previously captured by the National Museum of Romanian History staff are perfectly adequate for human interpretation, the variability of pixel intensity values generates inconsistent results when machine...

In order to preserve and restore the Imperial Gates belonging to the wooden church of Sanmihaiul Almasului, Salaj County, the scientific expertise of the wooden support and of the painting materials (ground, pigments) with FTIR, XRF spectroscopy and gas chromatography-MS. FTIR spectroscopy offers information about the wooden support whereas XRF, FT...

The paper presents the redesign process of the plastic anchor used for polystyrene walls. This process is based on the information obtained within a focus group and an extended analysis of the products available on the Romanian market. After the redesign process was completed the design process of the mould required to produce the plastic anchor ha...

The paper presents the entire process of designing and optimizing an injection mold for a polystyrene plastic anchor. The design process begins with a comprehensive market study of the polystyrene plastic anchors available on the Romanian market, and the results of this study are then used for the creation of a new model of anchor. After this first...

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 developm...

Critical infrastructures could endanger the trainees’ lives and/or the environment. The nature of these infrastructures often does not allow staff training in real situations. This paper presents the processes involved in designing a virtual reality platform (hardware and software) to provide a safe training environment, which is believed to be abl...

In order to preserve and restore the Imperial Gates belonging to the wooden church of Aşchileu Mic, Cluj County, the scientific expertise of the wooden support and of the painting materials (ground, pigments) with FTIR, XRF spectroscopy and DSC thermal analysis was performed. FTIR spectroscopy and DSC methods offer information about the wooden supp...

This paper presents a working methodology based on TRIZ method that can be used in the design of plastic products in an innovative way. The paper presents a type of paper trays that were designed using the presented algorithm. The concept was validated by 3D printing and testing at a 1:3 scale.

This paper presents the design process of HMD equipment made from plastic. This equipment has been specially designed to be manufactured using 3D printing processes. The equipment case represents an eye wear device that has been designed to be compatible with different types of mobiles phones and various accessories such as the Leap Motion sensor o...

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 Failur...

The paper presents a tool path generation methodology for roughing operation based on the oriented graph theory. The cutting areas are identified using an original method that is based on a bicolor and binary map. The toolpath is generated using the searching Dijkstra algorithm inside a graph in order to find the single-source shortest path. The me...

The paper presents the redesigning process of a plastic component named "safety ring" that is a part of the protection system of the hydraulic cylinder of an office chair. The main objectives of the redesigning process were to reduce the weight of the workpiece and increase the clamping strength in assembly between "safety ring" and the first segme...

Checking the symmetry of a Formula One (F1) car nose requires the measurement and inspection of complex surfaces and raises a number of challenges both in terms of the equipment used and the measurement strategy. Verifying the symmetry allows the identification of the asymmetrical areas regarding the critical aerodynamic elements of F1 car nose. Th...

This paper presents a methodology for the simulation and optimization in a virtual environment of a manual assembly process. For validation of the methodology the authors chose an assembly process that is already used in the manufacturing industry. In the first step of the proposed methodology the existing process is simulated and then based on the...

Paper by Paul Bere, Calin Neamtu. “Methodology for evaluate the form deviations for formula one nose car” in Volume 4, Issue 2, 148–154/June 2014 doi: 10.2478/s13531-013-0158-x contains an error in the author’s affiliation and descriptions of figures. The correct affiliation and descriptions of figures are presented below.

This paper presents a method of improving the design of a wind turbine blade using a shape based on submarine propellers in order to reduce noise. A miniature version of the blade at a scale of 1:20 was manufacturing from composite materials and tested on a small wind turbine (350 Watts). Using the reverse engineering method the dimensions were inc...

This paper presents a methodology and the results obtained by the authors for the manufacture of a F1 car nose. The working methodology and manufacturing stages are presented step by step and the validation of the methodology was achieved by manufacturing a model at a scale of 1:2. There were used modern means of rapid prototyping using plastic mat...

The paper presents a measuring strategy for a Formula One car using a Coordinate Measuring Machine (CMM) and a 3D laser scanning devices. The measurement procedures outlined the dimensional deviation of the CAD model and prototype made of composite material. The authors present two methods for the determination of symmetry for components of a Formu...

This paper presents a methodology for measuring using laser scanning the differences between ideal individual custom trays and classical individual custom trays obtained in the dental laboratory in the case of treatment steps to achieve total prostheses. The resulted 3D models from the scans can be used to: verify the accuracy of operations perform...

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 (mea...

The Kosons are ancient gold coins categorized as treasury coins which were not exchanged in commercial trades. This specific particularity of the Kosons enables scientists to use image processing techniques in the classification and authentication work. Because this type of coins have no signs of wear specific to a long time of circulation, it is n...

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....

Precise digital documentation of cultural heritage assets is essential for its preservation and protection. This documentation increases the efficiency of scientific studies that are being carried out during the restoration and renovation process. Precise digital documentation makes use of different laser scanners technologies. 3D scanning devices...

Any form of use of virtual reality or augmented reality in history and archaeology is based on 3D digitized models that are obtained in various ways (3D modeling, 3D scanning, photogrammetry, etc.). These represent virtual replicas of real artifacts/monuments. In the authors’ vision, a digital artifact is represented by the digitized form of a hist...

The accreditation of a measurement and 3D scanning laboratory according to ISO/IEC 17025:2005 involves a series of organizational efforts and investments that refer not only to the measuring and scanning equipment. Thus, an important condition to be fulfilled is that which refers to monitoring, control and record environmental parameters that can i...

Coordinate metrology is a subject that has evolved driven by two important vectors: hardware and software development. At present, most 3D measuring software offer features for offline programming of the Coordinate Measuring Machines (CMM). A few software solutions enable the simulation of both the CMM and other elements involved in the measuring p...

The present paper presents a model for using CAD soft-ware and reverse engineering methods for the reconstruc-tion of ceramic vessels, as part of the larger field of digital archeology. The case study focuses on the reconstruction of a specific Dacian pottery, namely the "chiup", used for storing food ad liquids, and the proposed reconstruction met...

The autonomous guided robots are one of the greatest challenges for the robotics industry, having a considerable impact for current research and future applications. Despite the level of existing technology, at least for now, all the efforts were driven towards other robotic fields and due to this fact, the progress for this zone is not very specta...

Carbon fibre reinforced composites are a good alternative to engineering materials; they have excellent properties and can be used in a large variety of engineering applications. Due to their properties we are facing difficulties in machining of these types of composites. This paper presents an experimental approach for the determination of the tem...

The present study is focused on an interdisciplinary approach on using the CAD software and reverse engineering method to address reconstructions of historical monuments. This paper describes the methodology to reconstruct ancient fortifications as well as artefacts found within or near them. The practical application of 3D models is made using a v...

This paper presents a ceramic vessels' database developed in a general purpose CAD application. The database contains 3D models using a 1:1 scale generated by the profile reconstructed using the photogrammetry or the laser scanning methods. For each vessel there is a series of metadata available (manufacturing method, year of discovery, the dating...

The main objective of the project described in this paper was the development of a semi-autonomous mobile robot capable of exploring various outdoor environments by using the LEGO® MindstormsTM NXT educational platform along with other several low-cost components (GPS receiver unit, digital compass and a wireless enabled Pocket PC). The robot auton...

Patients with heart valve failure undergo a Mechanical Heart valve replacement surgery. Currently, it is estimated that 2 million patients around the world have such mechanical prostheses implanted to help them in movement of blood and oxygen in the heart. To evaluate the success of the heart valve repair, it is necessary to completely understand t...

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.

The paper proposes a method for the reconstruction of Dacian ceramic vessels, named "chiup". These were used to store grain and were among the most widespread vessels for supply of the Dacian world. Due to their large dimensions the reconstruction process raises several difficulties from both technical and geometrical point of view. The digital rec...

Reverse engineering is a widespread concept used in industrial applications worldwide. It involves obtaining the geometric CAD model from 3D point clouds acquired by scanning existing parts or products. Applying the concept in medical applications requires specialized competences both in the field of health and medicine as well as in CAE (Computer...

Purpose - This paper intends to explore ways of improving the performance of projects' management by identifying possible quality risks along their development and analyzing possible solutions found within Quality Management. Methodology/approach - is the results are achieved by correlating the risk analysis results with proven Quality Management i...

The paper presents the development of an electronic course on the subject of measurement uncertainty by a consortium formed of partners at European level. The paper describes the steps followed by the consortium in the European Life Long Learning Erasmus project Statistical Analysis of Measurement Data for the Evaluation of Measurement Uncertainty...

The paper describes the results of the undertaken research carried in the field by the authors. The main goal of this research was to develop methods for the education and training in the field of designing, validating and simulation of the flexible manufacturing systems. The theoretical approach was implemented in algorithms for programming differ...

The LMS (Learning Management System) contributes to the development of e-learning, which administrates the electronic lessons and creates the learning environment for the students. assisting them in the studying process. The development of the LMS system depends on the customer requirements and on other conditions of the learning design, standards...

This paper is proposing an original model for developing design of the electronic courses, which includes all cycle’s phases of the course: designing, accomplishing, delivering and evaluating.