The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Current-transformer (CT) saturation has a major impact on the operation of differential protection schemes. Transformer differential protection must maintain security during CT saturation for external faults while preserving high sensitivity and speed of operation for lower magnitude internal faults. Relay manufacturers provide very little information or direction for protection engineers to set relays...
This paper deals with an experimental measurement and a numerical simulation of shielding effectiveness of a perforated shielding enclosure using finite element method (FEM). There are shown possibilities of model definitions, differences between 2D and 3D models are discussed. Important part of simulation is the possibility to verify the model results - the simulation result should be verified in...
Not far into the future, the power grid will be supported by response from the consumers, helping the grid operators in making more informed decisions about administrating electricity distribution. A critical enabler for a stable solution is the communication protocol between the consumer and the grid operator. Currently, there exist many evaluations of demand response strategies for shifting consumers'...
Short-term traffic prediction provides tools for improved road management by allowing the reduction of delays, incidents and other unexpected events. Different real-time approaches provide traffic managers with varying but valuable information. This paper reviews the literature regarding model-driven and data-driven approaches focusing on short-term realtime traffic prediction. We start by analyzing...
The reflection properties of early-age concrete specimens have been investigated with an open-ended waveguide radiator at R-band (frequency range of 1.7 GHz – 2.6 GHz). The complex dielectric permittivity of a concrete specimen is determined using measured reflection coefficient and simulation with CST Microwave studio. The numerical investigation into sensitivity of the reflection coefficient to...
The ability to coordinate intricate operations in both intelligence, surveillance and reconnaissance (ISR) as well as search and rescue (SAR) operations is a complex issue. Such operations can be described as a System-of-Systems (SoS). Both object process methodology (OPM) and color petri nets (CPN) can be used to create executable architecture models for an SoS. The modeling approach proposed in...
Particle transport codes used in detector simulation allow the calculation of the energy deposited by charged particles produced following an interaction. The pulses temporal shaping is more and more used in nuclear measurement into pulse shape analysis techniques. A model is proposed in this paper to simulate the pulse temporal shaping and the associated noise level thanks to the output track file...
The literature on Small and Medium Enterprises often discusses the emergent nature of the product development processes, however; it often does not address the lack of planning tools within such organizations. We aim to fill the gap in tool support for the planning process, by developing a discrete event simulation model to compute lead times of product development projects. The developed model explicitly...
As the semiconductor industry advances to ever smaller technology nodes, the power distribution network (PDN) is becoming an essential design factor to ensure system performance and reliability [1]. The time domain simulations typically utilize the chip power model (CPM), generated by Ansys RedHawk, as the current load. The typical CPM only includes current consumption in a few clock cycles, which...
In this paper, we explore reducing the rate for missing the Quality of Service (QoS) constraint for overloaded real-time systems. The QoS constraint is modeled using (m, k)-constraints, which require that at least m out of any k consecutive jobs of a task meet their deadlines. We proposed a dynamic scheduling scheme to satisfy the (m, k)-constraints for real-time tasks. The simulation results demonstrate...
As a promising direction of future Internet, Content-Centric Network (CCN) has attracted world-wide attention. In-network caching is an important feature of CCN network, which has significant impacts on the performance of content transmission. Existing researches on in-network caching either have no regard for the collaboration or need giant additional overhead for global optimization. This paper...
This paper describes a simple process for the generation of arbitrary probability distributions of complex data with correlation from sample to sample, optimized for hardware in the loop radar environment simulation. Measured radar clutter is used to evaluate the accuracy of the method, as well as the degradation in accuracy for both the clutter magnitude probability distribution and Doppler spectrum...
Monitoring and sensing of spectrum are becoming more and more important, as the subject of using underused TV White Spaces (TVWS) spectrum by software defined radios (SDR) and cognitive radios is advanced forward towards practical applications. Correctly identifying available TVWS bands is critical for success of TVWS based broadband communications, not causing interference to reception of TV broadcast...
A simple method for the measurement of complex permittivity is presented using an open TEM (Transverse Electro-Magnetic) cell. The scattering parameters of the TEM cell are measured with and without a rectangular sample of the material under interest in the cross section of the cell. Then the principle is to run a FDTD (Finite Differences Time Domain) simulation of the measurement setup and find the...
This paper overviews the measurement and simulation of the electric parameters of a small stripline. The stripline was designed and built for electromagnetic compatibility (EMC) testing of small electronic devices with the accent on electromagnetic immunity (EMI) testing. The paper describes the measurement of electric field inside the stripline in an anechoic chamber and the simulation using parametric...
Modern software and hardware designs are mostly hierarchical. Moreover, while the design specification is defined up-down, the design implementation and verification are done down-up. In such a case, as a rule, coverage properties for simulation-based verification are defined inconsistently for different stages of the design flow. The fact leads to the well known explosion of bug rate, when we pass...
Evaluating the performance of a computer system requires the use of representative workloads. Therefore it is customary to use recorded job traces in simulations to evaluate the performance of proposed parallel job schedulers. We argue that this practice retains unimportant attributes of the workload, at the expense of other more important attributes. Specifically, using traces in open-system simulations...
Innovative method of a real time measuring of drive systems operational parameters is presented. Such systems are commonly used in transportation vehicles working in cooper mines. Cardan shaft with strain gauge bridge was used as autonomous torque transducer, transmitting remotely measuring data in real time to the master system for data acquisition.
Critical infrastructure's (CI) (electricity, heat, water, information and communication technology networks) security, stability and reliability are closely related to the interaction phenomenon. Due to the increasing amount of data transferred, increases dependence on telecommunications and internet services, the data integrity and security is becoming a very important aspect for the utility services...
Vehicular Ad-hoc Network is gaining the attention of researchers because of the technological advancements for developing an Intelligent Transportation System (ITS). The dynamic nature of vehicles (nodes) leads to frequent path breaks and network fragmentation. Therefore, routing has become a critical issue in inter-vehicle communication. Location management in VANETs is considered as a critical issue...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.