Papers by Costel Emil Cotet
International Journal of Simulation Modelling, 2013
By proposing an optimization model for a new automated liquid penetrant inspection (LPI) system i... more By proposing an optimization model for a new automated liquid penetrant inspection (LPI) system in order to increase its productivity, the paper tries to identify the best algorithm to solve this case study. The architecture of the system is dictated by the successive stages of the inspection process and the available conditions in the work shop. As a novelty in the field, the authors developed such a fully automated LPI system for inspecting different parts, which eliminates the need of the visual inspection made by operator, using instead dedicated software solution for processing the digital images of the inspected parts and for giving the pass/fail verdict. In the present case study, the attention was focused on optimizing the new LPI system architecture. Simulations in different working scenarios are run with the purpose to increase productivity by optimizing the critical waiting times within the system and by establishing the best order for inspecting parts belonging to three families subjected to LPI method. Moreover, the results of the simulation are used for programming the system by setting the optimal values of the functional parameters of system's equipment in order to avoid running a large number of tests which are expensive and time consuming.
Proceedings of the 29th International DAAAM Symposium 2018
The term "culture" speaks to an arrangement of qualities, moral standards, considering and acting... more The term "culture" speaks to an arrangement of qualities, moral standards, considering and acting models that are acknowledged by a collectivity and decide the given social gathering to act unmistakably from other social gatherings. The issue of association culture is all the time examined in connection to evolution. The normal origination is that a business enterprise culture strongly affects progress. An association culture that makes esteem assumes regard for individuals and administrations which not just fulfil the buyer's needs, yet in addition outperform them. Customary training has contributed significantly to the present levels of mechanical progress and innovative headway. Nonetheless, all together for advanced education to convey future ages with the correct arrangement of abilities and learning; a basic inquiry must be asked in regard to how advanced education organizations would be influenced by the fourth modern transformation and how the conveyance of training will be changed. There are diverse open doors accessible that will shape the part which can be embraced by advanced education in the fourth mechanical upset. Consolidating the quality of the customary advanced education with the expanding pattern speaks to essential strides to scale quality instruction that would change worldwide advanced education.
Procedia of Economics and Business Administration, 2017
This paper introduces an immersive platform for distance learning. It integrates a lot of useful ... more This paper introduces an immersive platform for distance learning. It integrates a lot of useful instruments for e-Learning like: browsing web, screen sharing, video players, virtual library, live streaming, webcam, videoconferences, VoIP, chat, whiteboard, automatic checking systems, and interactive testing evaluation systems. Our platform, TIMV Plus, allows the import of 3D objects in FBX and OBJ format. This type of objects can be obtained by using any 3D software or by being imported from Google Warehouse or Google Blocks, so that more 3D components can continuously emerge on the platform, up to each user's will. Given the fact that this platform uses a server-client architecture, any new modification is saved on server, and the other users can visualize in real time the new components.
This paper describes some results of authors' research in machine reading at scale as a suppo... more This paper describes some results of authors' research in machine reading at scale as a support for self-learning, which combines the challenges of document retrieval (finding the relevant articles) with that of machine comprehension of text (identifying the answer spans from those articles). Our approach combines a search component based on bigram hashing and TF-IDF (term frequency–inverse document frequency) matching with a multi-layer recurrent neural network model trained to detect answers in Wikipedia paragraphs.
MATEC Web of Conferences, 2021
The present paper aims to highlight the way in which the speeds and accelerations for the numeric... more The present paper aims to highlight the way in which the speeds and accelerations for the numerical control (NC) axes of the systems specific to a didactic stand with Automated Storage & Retrieval System (AS-RS) and guided transport system can be determined experimentally. The stand consists of an AS-RS system where the storage of pallets with products is achieved using 3 storage structures arranged circularly around the transport-transfer system. The pallets reach the entryexit station by means of a two-station guided transport system. Its role is to supply the AS-RS with pallets for storage and to evacuate the pallets from it. Stepper motors were used to drive the NC axes specific to the mentioned systems, and the control was realized by means of programmable logical controllers (PLC). The control programs were made in applications according to these PLC. A Supervisory control and data acquisition (SCADA) type interface was created and thus it was possible to determine experimenta...
Naloga navideznih omrežij v navideznem podjetju
Strojniski Vestnik, 2006
Advances in product development concepts have demonstrated the trend for integrating different de... more Advances in product development concepts have demonstrated the trend for integrating different development phases through the integrated product data model and collaboration technologies. Future product-development processes will take all aspects of the whole product lifecycle into account. At the same time, interaction and communication technologies will allow people with different knowledge backgrounds and dealing with different aspects of a product work together to achieve the best product design. This paper sketches a future vision of product development with an emphasis on the support of creative design. We call it direct digital design. This paper presents a vision of next-generation enterprise working environments and describes a core information technology that future systems can be built on. The concepts of a virtual enterprise (VE) and of virtual teams, enabled by a new generation of internet/intranet/ extranet-based services are discussed here, as a means to stay competitive and to thrive in a turbulent market.
DAAAM International Scientific Book, 2007
This paper presents a solution of a next generation engineering working environments implemented ... more This paper presents a solution of a next generation engineering working environments implemented in the experimental platform for training, research and consulting in the new digital economy (CESICED) and describes a core information technology which this systems can be built on. The platform is developed at University POLITEHNICA of Bucharest in the PREMINV center. We emphasize on special skills requirements for collaborative design of the mechatronics products. Within the framework of its activities on collaborative engineering, the PREMINV set up training projects aiming at developing competence's in this field with objectives of education training but also research, and industrial transfers.
International Conference on Instrumentation, Measurement, Circuits and Systems (ICIMCS 2011)
The paper presents the knowledge management and business, intelligent concepts in order to analyz... more The paper presents the knowledge management and business, intelligent concepts in order to analyze enterprise internal and external resources based on the knowledge transfer and capitalization processes. The virtual enterprise business network purposed solution expect to improve small and medium-sized enterprises (SMEs) involvement in new product manufacturing networking efforts in an virtual industrial holding, enable better and faster decision processes and promote the development of the business services. The main goal of the paper is to propose knowledge management solutions to support knowledge applications development at the industrial holding level. An expert system for products identification when the technical characteristics are known will illustrate how this system works. That intends to facilitate and enhance the required knowledge management processes linked with the business process management in knowledge alliances at an industrial holding level.
DAAAM Proceedings, 2017
The alert steps of industrial digitization makes now credible the use of "Industrie 4.0" term lau... more The alert steps of industrial digitization makes now credible the use of "Industrie 4.0" term launched by Henning Kagermann in 2011 and by most appreciations, interconnected digital technology is the Fourth Industrial Revolution. All the major innovations that occurred in digital technology require from the virtual enterprise actors a level of knowledge not so easy to be achieved. Knowledge comes in multiple forms and types (tacit, explicit, learned individually or through collective learning) and is in close link with the management of virtual enterprises. When it is absent the activity of the company will be faulty. It is very important to find the reason for the existing gap between demand and offer of knowledge and establish in what way it will affect the management of virtual enterprise. This study aims to present the level of existing knowledge versus the level of knowledge demand, how we can help increase competence, in which areas organisations can benefit from it and what type of competences we will need in the future.
Virtual Model in Monitoring and Optimization of a Selective Waste Collection Integrated System
This paper presents some results of a research project aiming to increase the usage degree, produ... more This paper presents some results of a research project aiming to increase the usage degree, productivity and storage capacity of a selective waste collection system and the integration of the system in the smart city infrastructure. Companies that have waste collection and recycling as their target activity are looking for solutions in order to increase the collection levels for all types of waste. In our project we plan to modernize a waste collection system that will considerably increase the waste collection level, that will meet the requirements and the needs identified by the economic agent and that will adapt to the new technologies so that it will be integrated in the infrastructure of the smart city. The first objective of the project is to increase the use of the system, improve its productivity and its collected waste storage capacity. The second objective is to integrate the system in the infrastructure of the smart city. For the activities planned in order to meet these ...
International Journal of Modeling and Optimization, 2021
Identifying the “health state” of the equipment is the domain of condition monitoring. The paper ... more Identifying the “health state” of the equipment is the domain of condition monitoring. The paper proposes a study of two models: DNN (Deep Neural Network) and CNN (Convolutional Neural Network) over an existent dataset provided by Case Western Reserve University for analyzing vibrations in fault diagnosis. After the model is trained on the windowed dataset using an optimal learning rate, minimizing the cost function, and is tested by computing the loss, accuracy and precision across the results, the weights are saved, and the models can be tested on other real data. The trained model recognizes raw time series data collected by micro electro-mechanical accelerometer sensors and detects anomalies based on former times series entries.
Proceedings of the 30th International DAAAM Symposium 2019, 2019
All manufacturing and assembly systems are dealing with different difficulties caused by flow con... more All manufacturing and assembly systems are dealing with different difficulties caused by flow concentrators. In this paper we use an example based on a chest freezer assembly architecture consisting in several sectors to create and simulate a model representing the studied architecture using WITNESS Horizon simulation software. The main goal is to locate material flow bottlenecks. Once they are identified the slow down and / or block of the flow can be improved for obtaining an optimized architecture and to increase the productivity. The optimisation process was both functional and technological. All manufacturing processes were reorganised, which lead to reduced manufacturing times in all studied areas.
DAAAM Proceedings, 2018
Companies, professionals and industry experts are using trade shows to share information and to b... more Companies, professionals and industry experts are using trade shows to share information and to build long-lasting business relationships. A trade show could have some disadvantages such as: higher price, difficulty to attend for potential partners due to distance, cost and time. An alternative could be the use of virtual reality exhibitions. In this paper, research results for developing a virtual reality exhibition platform are presented. The platform provides collaborative and advertisement tools enabling the possibility to interact and run complex activities remotely in a virtually immersive environment. The authors have developed some tools that extends the High Fidelity platform capabilities by designing, modelling and texturing the virtual environment, consisting in a futuristic city, a large exhibition pavilion and the exhibition booths using Maxon Cinema 4D and Substance Painter for modelling.
Using PLM training and consulting in university - enterprises partnership
DAAAM International Scientific Book, 2007
ABSTRACT Taking into account that the Romanian enterprises are still in the first stages of integ... more ABSTRACT Taking into account that the Romanian enterprises are still in the first stages of integrating the PLM approach, we started a partnership implying INPRO, a Romanian national research network with its traditional industrial partners as well as the PLM solutions providers on the Romanian market. The new product proposed by the national INPRO Research Network implying research centres and universities located in different Romanian geographical areas and the IBM/DASSAULT and UGS as PLM solutions providers is a package of services and training modules available on CD, on paper, and on Internet for open distance learning, based on a new Virtual Enterprise (VE) oriented curricula. In the training process we had included as a new multi site networking relationship between partners' on-line applications at the PLM modules training courses interconnecting the research and the industrial partners. UPB-PREMINV Research Centre as a member in this partnership also started a comparative performances analysis of those two PLM approaches considering the specific enterprises needs. Finally an appropriate and personalized solution should be available for every one of those industrial partners of the research network who expressed their interest in implementing PLM solutions.
International Journal of Modeling and Optimization, 2022
This paper describes authors’ research in developing collaborative virtual reality classrooms for... more This paper describes authors’ research in developing collaborative virtual reality classrooms for laboratory and distance learning. The proposed platform was developed to facilitate the implementation of virtual reality labs that can be used by students, locally or by remote access from any device.
DICOM 3D viewers, virtual reality or 3D printing – a pilot usability study for assessing the preference of orthopedic surgeons
Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine
As standard practice in orthopedic surgery, the information gathered by analyzing Computer Tomogr... more As standard practice in orthopedic surgery, the information gathered by analyzing Computer Tomography (CT) 2D images is used for patient diagnosis and planning surgery. Lately, these virtual slices are the input for generating 3D virtual models using DICOM viewers, facilitating spatial orientation, and diagnosis. Virtual Reality (VR) and 3D printing (3DP) technologies are also reported for use in anatomy visualization, medical training, and diagnosis. However, it has not been yet investigated whether the surgeons consider that the advantages offered by 3DP and VR outweigh their development efforts. Moreover, no comparative evaluation for understanding surgeon’s preference in using these investigation tools has been performed so far. Therefore, in this paper, a pilot usability test was conducted for collecting surgeons’ opinions. 3D models of knee, hip and foot were displayed using DICOM 3D viewer, two VR environments and as 3D-printed replicas. These tools adequacy for diagnosis was...
Sensors
Air pollution has become the most important issue concerning human evolution in the last century,... more Air pollution has become the most important issue concerning human evolution in the last century, as the levels of toxic gases and particles present in the air create health problems and affect the ecosystems of the planet. Scientists and environmental organizations have been looking for new ways to combat and control the air pollution, developing new solutions as technologies evolves. In the last decade, devices able to observe and maintain pollution levels have become more accessible and less expensive, and with the appearance of the Internet of Things (IoT), new approaches for combating pollution were born. The focus of the research presented in this paper was predicting behaviours regarding the air quality index using machine learning. Data were collected from one of the six atmospheric stations set in relevant areas of Bucharest, Romania, to validate our model. Several algorithms were proposed to study the evolution of temperature depending on the level of pollution and on seve...
International Journal of Simulation Modelling, 2016
The main goal of the paper is to present how CAD and the simulation results of a virtual model we... more The main goal of the paper is to present how CAD and the simulation results of a virtual model were used to develop and adapt an educational platform to various manufacturing scenarios in an Industrial Logistics laboratory optimizing the performances in terms of productivity. Our paper is divided in two parts. The first part describes the design and development of an educational platform containing an AS/RS (automated storage/retrieval system) system and a RGV (Rail-Guided Vehicle). All the phases of the platform development are presented, starting with 3D modelling, and ending with the platform testing and its integration in a manufacturing cell. The second part demonstrates the platform performance diagnosis and optimization in different functional scenarios using material flow simulation. The problems that occurred (when the platform becomes part of different types of manufacturing architectures) are analysed using the simulation reports diagnosis and a new simulation validates the optimization solutions.
Sustainability
Nowadays, governments and companies are looking for solutions to increase the collection level of... more Nowadays, governments and companies are looking for solutions to increase the collection level of various waste types by using new technologies and devices such as smart sensors, Internet of Things (IoT), cloud platforms etc. In order to fulfil this need, this paper presents solutions provided by a research project involving the design, development and implementation of fully automated waste collection systems with an increased usage degree, productivity and storage capacity. The paper will focus on the main results of this research project in turning the automated waste collection system into a smart system so that it can be easily integrated in any smart city infrastructure. For this purpose, the Internet of Things platform for the automated waste collection system provided by the project will allow real time monitoring and communication with central systems. Details about each module are sent to the central systems: various modules' statuses (working, blocked, needs repairs or maintenance etc.); equipment status; storage systems status (allowing full reports for all waste types); the amount of waste for each module, allowing optimal discharging; route optimization for waste discharging etc. To do that, we describe here an IoT cloud solution integrating device connection, data processing, analytics and management.
MATEC Web of Conferences
Considering the strong need for improvement of security and multimedia systems in the automotive ... more Considering the strong need for improvement of security and multimedia systems in the automotive industry, wiring harness production is becoming more and more important. Adapting to the integration of new technologies on the vehicle is a challenge for wiring harnesses manufacturers. Now the production of wiring harnesses is still quite dependent on human resources, the way of distributing the workload on the workstations having a large share in increasing productivity. Components such as terminals, connectors and seals are getting smaller and smaller, making the manual handling more difficult. A solution to this problem could be increasing the automation degree in wiring harness production. The objective of the research topic approached in this article is to identify solutions for optimizing the wiring assembly flow by partially automating the production flow. The concern for the application of automated processes in the production of car wiring is not new, but so far, the wiring ma...
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Papers by Costel Emil Cotet