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Smart grids rely on the integration of distributed energy resources towards an intelligent and distributed manner to organize the electrical power grid enabled by a bidirectional flow of information to improve reliability and robustness, fault detection and system operation, and plug-and-playability of energy devices. The integration of information and communication technologies (ICT), one of the...
This paper presents ongoing work on the formalism of Cyber-Physical Systems (CPS) simulations. These systems are distributed real-time systems, and their simulations might be distributed or not. In this paper, we propose a model to describe the modular components forming a simulation of a CPS. The main goal is to introduce a model of generic simulation distributed architecture, on which we are able...
Cyber-Physical Systems (CPS) are composed of computation, networking, and physical processes. Model-based design is a powerful technique to apply mathematical modeling in CPS design. A model of a physical system is the description of variations in some aspects and properties of the system such as motion, velocity, and pressure. The variations of physical quantities such as motion, velocity, and pressure...
Questions of computer realization for new class — three levels of adaptive manufacturing control system were considered. They were marked with special features that allow to form demands to methods of process description. It was shown that suggested homogeneous method suits mathematical description perfectly. The method consists of static linear programming task and differential equations. Local methods...
The article proposes a new method of digital loop control based on the sharing of digital PID control formula, characterized by preventive assessment of the control object during each control cycle to select the control action. The selected control action for a subsequent control cycle corresponds to the discrete PID control formula that will ensure the best dynamics control parameter during the next...
Modeling and Simulation (M&S) has become an essential tool in the development, testing and verification of operational software in a complex multi-domain, multi-threaded heterogeneous system of systems environment. The complex systems of today encompass mix of hardware sub-systems (with varying degree of capabilities), software environments (comprising a plethora of development environments, operating...
In order to study processes in organizations which are result of many local interactions between organization's actors, more and more often computer simulations are used. One of the problematic issue in this kind of studies is to ensure that the outcomes of the models reflect in some way real-world social networks. In this article we compare network structures generated in two such models using as...
This paper deals with the problem of properly simulating the Internet of Things (loT). Simulating an loT allows evaluating strategies that can be employed to deploy smart services over different kinds of territories. However, the heterogeneity of scenarios seriously complicates this task. This imposes the use of sophisticated modeling and simulation techniques. We discuss novel approaches for the...
With cloud computing, the efficient management of resources is of great importance as an increased utilization of the available resources can result in higher scalability and significant energy and cost reductions. Experimental validation of novel resource management strategies is costly and time consuming, and often requires in-depth knowledge of and control over the underlying cloud platform. As...
The resources provisioning for workflow applications has become one of the most difficult challenges in the cloud. It consists in taking an appropriate decision when mapping tasks to resources while meeting QoS requirements. The need to modify workflows while they are being executed has become a major requirement to deal with unusual situations and evolution. Therefore, it is necessary to implement...
Today, most large and complex systems such as aircrafts or power grids integrate physical and human aspects with computing and networking, and therefore constitute so-called socio-cyber-physical systems (SCPS). Their engineering, from prospective and conceptual studies (to determine the scope of the system) through design and construction to operation, maintenance and upgrades, necessitates the cooperation...
Coriolis vibrating gyroscopes can be modeled by a planar resonator, using masses, springs and damping. In this paper, the corresponding equations are studied in order to characterize real vibrating cells. It is shown how to present the problem to allow efficient numerical simulations and analytic developments. In particular, the use of the method of Averaging is fundamental, simplifying most of the...
The performance of the systems which based on wireless signals such as localization system relies mostly on the propagation model. Radio signals can be mainly difficult to model because the channel varies significantly with the environment such as indoors. This paper studies two popular propagation models for indoor environments. Practically, these models do not estimate the radio signal fading properly...
Recently, Oxide-based random access memory devices (OxRAM) have shown the potential to outperform non-volatile memories due to their high scalability, high-speed, high-density, and low-energy operation. A critical requirement for using OxRAM at circuit level is a predictive model for device behavior that can be used in simulations, as well as a guide for circuit designers. The proper choice of the...
In this paper the adaptive mesh model is studied. First we introduce the 3 subdivision method which is already exist. Second, in order to make the simulation result more realistic and reasonable, we extend the traditional scheme and apply two different subdivision schemes on the triangular mesh. At last, a new mesh coarsening method is proposed, with the help of this method, we build a extended adaptive...
The on-going research for low power, faster operation speed nonvolatile memory device with tremendous packing density has attracted the researchers towards the evolution of a new nanoscale solid state ionic device, in particular memristor for future modern electronic systems. Memristor (the so called Resistive Random Access Memory (ReRAM)) is the promising candidate for the replacement of conventional...
A cloud-based web service is presented for users to machine-generate network simulation programs for the opensource ns-3 network simulator. The service takes as input a userprovided network system model and delivers as output an ns-3 'main' program. An accompanying user-based modeling tool provides a graphical user interface for constructing and editing models of four layer Internet systems in terms...
In this paper, some solutions for the 18O isotope separation process identification are proposed. In this context, both integer-order and fractional-order models are comparatively tested. Using the mean square error as quality indicator, the model considered as the identification problem solution is determined. Some interesting simulations are presented in the end of the paper, which prove both the...
The paper presents a solution for the 18O isotope separation process control. The separation process is a non-linear one and it is modeled using the fractional-order systems theory, in order to obtain a higher accuracy. Based on the considered model, an Internal Model Control strategy is proposed for the 18O isotope concentration control. The used controller is an adaptive fractional-order one and...
Due to a high penetration by renewables and a strong trend towards decentralization, future energy grids exhibit an increasingly emergent behavior. As a consequence new engineering approaches, based on decentralized decision making, have been proposed. The Agent.HyGrid project provides a framework for the design, development and testing of energy infrastructures. However, in contrast to other approaches...
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