Papers by Calin Ciufudean
Smart Energy for Smart Transport
Despite the interest in the MaaS system is growing fast within the scientific community, it remai... more Despite the interest in the MaaS system is growing fast within the scientific community, it remains uncertain if MaaS could be a potential tool able to reduce car ownership. This study aims to capture the impact of the total cost of ownership (TCO) on MaaS demand by endogenizing the MaaS choice and the TCO within the users' travel choice in an agent-based model. We simulate different TCO price range starting from a benchmark cost in the literature and embed a specific type of MaaS plan which gives unlimited access to the services. Results show a significant growth of MaaS demand when TCO rises, in particular MaaS members are car users who shift their mode choice to public transport by travelling within more trips but in a shorter time slot. In contrast, MaaS users employ public transport for short trips while they still employ cars reducing their travel time but employing the same number of trips when TCO decreases. Results suggest that MaaS might become a more sustainable service by developing specific subsidies to discourage car ownership and by increasing mobility accessibility.
This paper proposes a practical new method for power factor compensation of a three-phase bridge ... more This paper proposes a practical new method for power factor compensation of a three-phase bridge uncontrolled rectifier with a dc filter and nonlinear load. The proposed method is based on the rectifier with near sinusoidal currents called RNSIC, which functions as power factor compensation in a wide range of load currents. The decrease of input currents harmonics, below the limits imposed by IEEE 519/1992 and IEC 61000-3-4 international standards, allows the decrease of THD, hence the increase in real power factor. The validity of proposed method is supported by the practical results obtained by means of an experimental bench.
Journal of Systems Science and Systems Engineering, May 19, 2009
This paper presents a study on the performance of flexible manufacturing systems (FMSs), by using... more This paper presents a study on the performance of flexible manufacturing systems (FMSs), by using discrete event system (DES) models, considering resource losses modelled by a parameter entitled coverage factor. We conclude that the resources cell loss distribution between the tasks of a FSM is a real function that cannot be integrated, in order to calculate its primitive, in the classical sense of Riemann or Lebesgue, but only in the sense of Henstock-Kurzweil integral. Our result allows one to study more general processes where highly oscillatory functions occur. The method used to deduce the function describing the resources cell loss distribution is compared with a classical method related in the literature, respectively rational interpolants. An example has been constructed to emphasize what we believe to be, new approaches.
The BG-01 system monitors every deviation from common use of the electrical installations, such a... more The BG-01 system monitors every deviation from common use of the electrical installations, such as: the overmuch increasing of the intensity of electric current, increasing the temperature inside the electricity distribution panel and on each circuit, as well as occurrence of any flame or spark. Any deviation is spotted by specific sensors and then transmitted to the user in order to intervene in real time. The system presents an innovation in the field of electrical installation protection against fire, even from an incipient phase characterized by deviations from nominal functional parameters of the electrical installations.
Lecture notes in intelligent transportation and infrastructure, 2023
Thermal comfort inside buildings is obtained by using advanced automatic heating systems. Whateve... more Thermal comfort inside buildings is obtained by using advanced automatic heating systems. Whatever the complexity of these systems, controlling the amount of heat produced in a heating installation that operates with boilers and radiators is always done by controlling temperature of thermal agent. In this article there are made the models for two types of automatic systems that control the temperature of thermal agent: a classic system with nonlinear regulator and a new system with fuzzy logic controller. Both systems use a three-way control valve. The results obtained by simulating the operation for each automatic system allow determining the main performances. The comparison of the performances for the two systems and conclusion demonstrates the superiority of the fuzzy control system.
This paper proposes a practical new method for power factor compensation of a three-phase bridge ... more This paper proposes a practical new method for power factor compensation of a three-phase bridge uncontrolled rectifier with a dc filter and nonlinear load. The proposed method is based on the rectifier with near sinusoidal currents called RNSIC, which functions as power factor compensation in a wide range of load currents. The decrease of input currents harmonics, below the limits imposed by IEEE 519/1992 and IEC 61000-3-4 international standards, allows the decrease of THD, hence the increase in real power factor. The validity of proposed method is supported by the practical results obtained by means of an experimental bench.
The total harmonic distortion (THD) monitoring is an important challenge in the industrial and of... more The total harmonic distortion (THD) monitoring is an important challenge in the industrial and office building environment. The IEEE-519 and IEC 61000-3 standards limit the individual harmonics current as well as the THD for nonlinear power electronic loads. A harmonic current distortion comparative study of a classical three-phase rectifier diode (TPRD) and rectifier with near sinusoidal currents (RNSIC) are presented.
Elektronika Ir Elektrotechnika, 2015
This paper focuses on the effects of nonlinearities of electrical signals driven through cable ne... more This paper focuses on the effects of nonlinearities of electrical signals driven through cable networks. Some new methods derived from original models are proposed here in order to avoid the damages caused by nonlinearities induced by cable networks. Ill. 9, bibl. 9 (in English; summaries in English, Russian and Lithuanian).
2021 IEEE International IOT, Electronics and Mechatronics Conference (IEMTRONICS), 2021
Communication is the act of transferring information between entities. Existing architectural com... more Communication is the act of transferring information between entities. Existing architectural communication approaches provide solutions for data transfer from the sender to the receiver. While those solutions are targeting different domains, we can find a lot of similarities in their architectures. In this paper, we follow the interpersonal communication process principles with its communication components for defining a whole communication chain that combines the sensor actuator and data transfer items in one concept, pointing to the person to person and device to device communication similarities. We come with an approach of a methodology for the Internet of Things abstracted by the Spread-out Electronic Device concept. We consider the whole IoT as a single electronic device with cut-out and broken wires and replaced with communication chains.
2020 IEEE 20th Mediterranean Electrotechnical Conference ( MELECON), 2020
Deadlock avoidance of energy delivery through lines with shared resources, such as green energy g... more Deadlock avoidance of energy delivery through lines with shared resources, such as green energy grids, is an actual, but hard task. We use Petri nets for modeling the controllers of energetic lines capable to provide a restrictive policy which prevents deadlocks in the system. Dealing with Petri net formalism is a versatile and user friendly way for implementing a certain model, concerning the process of model’s simulation before building it. A difficult problem when dealing with Petri nets modeling and simulation concerns system’s reversibility in order to ensure the system`s recoverability from deadlock or failure states. Therefore in this paper we propose an approach by using qualitative formalisms for avoiding the bottlenecks of the Petri net model without losing the desired properties for real system. An example illustrates our approach.
The unique electronic and optical properties of newly discovered 2D crystals such as graphene, gr... more The unique electronic and optical properties of newly discovered 2D crystals such as graphene, graphene oxide, molybdenum disulfide, and so on demonstrate the tremendous potential in creating ultrahigh-density nano-and bioelectronics for innovative image recognition systems, storage and processing of big data. A new type of memristors with a floating photogate based on biocompatible graphene and other 2D crystals with extremely low power consumption and footprint is considered. The photocatalytic oxidation of graphene is proposed as an effective method of creating synapse-like 2D memristive devices with photoresistive switching for nonvolatile electronic memory of ultrahigh density. Particular attention is paid to the new concept of the formation of self-assembled nanoscale memristive elements interfacing artificial electronic neural networks. 2D photomemristors with a floating photogate exhibit multiple states controlled in a wide range of electromagnetic radiation and can be used for neuromorphic computations, pattern recognition and image processing needed to create artificial intelligence.
Discrete event systems (DESs) represent an important chapter of artificial intelligence and have ... more Discrete event systems (DESs) represent an important chapter of artificial intelligence and have applications in several domains ranging from technical sciences to social sciences, environmental surveillance, and health care. The ideas and approaches described in the book are the result of the author’ practice in production (over 15 years), in scientific research and university education (over 11 years), and they deal with general aspects of discrete event modelling of medical diagnosis, as well as some peculiarities from non-typical application in medicine. Discrete Event Systems Applied in Medicine will provide you with valuable insights into modelling and evaluation of models, methods and applications necessary for an effective implementation of DESs formalisms in medicine. People with diverse background like research, academia, etc., can take advantage of this book and can shape a new way of analyzing discrete event systems and their applications in medicine.
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Papers by Calin Ciufudean