Papers by Calin Ciufudean
Proceedings of the IEEE International Symposium on Industrial Electronics, 2005. ISIE 2005., 2005
In this paper we study the problem of deadlock avoidance of production lines with shared resource... more In this paper we study the problem of deadlock avoidance of production lines with shared resources. We use the Petri net model for production lines and a restrictive policy which prevents some enabled transition from firing for avoiding deadlock in the system. This is the safety control for non-stochastic discrete event systems. We generalise this notion of safety to the setting of stochastic discrete event systems, modelled as Markov chains. We propose a restriction policy for this generalised case.
Innovative Non-polluting Traffic Light Crossroads
Lecture notes in intelligent transportation and infrastructure, 2023
System for Avoiding Traffic Jams of Intervention Vehicles
Lecture notes in intelligent transportation and infrastructure, 2023
Automate System for Monitoring Electrical Installations BG-01
2019 11th International Symposium on Advanced Topics in Electrical Engineering (ATEE), 2019
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.
Telemedicine Data Flow Models
Automatic temperature control of thermal agent in heating installations of buildings
2017 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM) & 2017 Intl Aegean Conference on Electrical Machines and Power Electronics (ACEMP), 2017
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.
Basic Support of Fuzzy Filters of Biological Data
Sustainable Markov Chain Models for Telemedicine
Trans. Mass Data Anal. Images Signals, 2017
Equivalent Structures for Nonlinear-Signal Cable Networks
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).
Availability of Epidemics Ripple Effects
A comparative analysis of total harmonic distortion in TPRD and RNSIC
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.
This paper deals with a new issue encountered in industry, e.g. the bottlenecks of industrial int... more This paper deals with a new issue encountered in industry, e.g. the bottlenecks of industrial internet of things (IIoT) automation devices, such as flexible manufacturing systems (FMS). We model such systems with Petri nets and we impose a restrictive policy in order to reject bottlenecks in the system. Deadlocks in automations driven through IIoT applications occur mainly when two or more devices try to access the same resource. In order to solve these issues we use Petri net models which ensure reversibility of the net, respectively to grant the recoverability property of the modelled system. We deal with reversibility of a net not necessary to find returning routes from bottlenecks, but also by finding alternative routes for avoiding deadlocks in the IIoT controlled system. We emphasize our approach with an example, and we propose a general policy for these systems in order to ensure their vivacity.
Trans. Mach. Learn. Data Min., 2015
In this chapter the expression “holonic cyclic manufacturing systems” refers to complex assembly/... more In this chapter the expression “holonic cyclic manufacturing systems” refers to complex assembly/disassembly systems or fork/join systems, kanban systems, and in general, to any discrete event system that transforms raw material and/or components into products. Such a system is said to be cyclic if it provides the same sequence of products indefinitely. This chapter considers the scheduling of holonic cyclic manufacturing systems and describes a new approach using Petri nets formalism. We propose an approach to frame the optimum schedule of holonic cyclic manufacturing systems in order to maximize the throughput while minimize the work in process. We also propose an algorithm to verify the optimum schedule.
Modelling Formalisms for Green Transportation Systems
IGI Global eBooks, 2020
Protection of environment implies the coordination of the local and regional authorities to imple... more Protection of environment implies the coordination of the local and regional authorities to implement actions for conservation of all natural resources in the actual context of globalisation. One of the most important direction for applying the above mentioned desiderates is a better planning of transportation, as we all know that globalisation implies an accelerated process of externalisation of ideas, know-how, products and labours. In this chapter, we consider discrete event systems (DES) modeled via a state space representation. The model objective is the avoidance of a given set of states, or equivalently the fact that certain predicates, specified in terms of states are always false. We address the state space controlled Petri Nets (PN) and a technique to reduce the complexity of these nets, by taking into account the fact that the complexity of the considered nets depends mainly on the representation of the control design, respectively on the forbidden sets of places. Our goal is to describe in an efficient way the forbidden sets of the modeled system, e.g. to describe in an efficient way the DES modeled with controlled Petri nets. An example from the railway systems illustrates this 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.
Advances in digital crime, forensics, and cyber terrorism book series, 2015
Cyber Security Model of Artificial Social System Man-Machine takes advantage of an important chap... more Cyber Security Model of Artificial Social System Man-Machine takes advantage of an important chapter of artificial intelligence, discrete event systems applied for modelling and simulation of control, logistic supply, chart positioning, and optimum trajectory planning of artificial social systems. "An artificial social system is a set of restrictions on agents` behaviours in a multi-agent environment. Its role is to allow agents to coexist in a shared environment and pursue their respective goals in the presence of other agents" (Moses & Tennenholtz, n.d.). Despite conventional approaches, Cyber Security Model of Artificial Social System Man-Machine is not guided by rigid control algorithms but by flexible, eventadaptable ones that makes them more lively and available. All these allow a new design of artificial social systems dotted with intelligence, autonomous decision-making capabilities, and self-diagnosing properties. Heuristics techniques, data mining planning activities, scheduling algorithms, automatic data identification, processing, and control represent as many trumps for these new systems analyzing formalism. The authors challenge these frameworks to model and simulate the interaction of man-machine in order to have a better look at the human, social, and organizational privacy and information protection.
Artificial Social System Models of Medical Emergencies
Discrete Event Systems Applied in Medicine
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.
The paper presents a method for controlling evaporator and condenser fans in a refrigeration syst... more The paper presents a method for controlling evaporator and condenser fans in a refrigeration system. The refrigeration system includes a refrigerant circuit defined by a compressor, a condenser, a throttling device, and an evaporator. The system includes an evaporator fan and a condenser fan and a variable frequency drive unit controller coupled to the fans, which controlls the speed of the fans.
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Papers by Calin Ciufudean