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This paper presents the ongoing research results of the high frequency grounding system analysis in two-layer soil structure. On the basis of rigorous electromagnetic field theory, which involves Sommerfeld's integrals, the mathematical model is formulated by the mixed potential integral equation (MPIE). Detailed analysis of a high frequency performance of a typical horizontal grounding conductor...
The paper deals with a simple model for an assessment of the current density induced in the human body located in the vicinity of a lightning rod struck by lightning due to an electric field irradiated by the rod. The lightning rod is represented by a straight thin wire antenna excited by an equivalent current source. The current induced along a lightning rod due to a direct lightning strike is determined...
In this paper it is presented and researched the possibility of using the differential evolution (DE) algorithm to solve the frequency assignment problem (FAP). This problem involves a free assignment of a number of available frequencies to a set of requesters, subject to a set of specified constraints given by an interference matrix. Hence, it is a very important problem in the telecommunications...
Large scale and high density networks of tiny sensor nodes offer promising solutions for event detection and actuating applications. In this paper we address the effect of high density of wireless sensor network performance with a specific MAC protocol, the lightweight medium access control (LMAC). We propose a power control support for the LMAC protocol to successfully cope with high density issue...
This paper evaluates the impact on the performance of limited battery energy in ad hoc networks. In the literature, the widely adopted assumption is to have nodes with an infinite energy, but this assumption does not consider that a terminal power itself by means of battery, which can easily exhaust its energy. When a node switches off, as a consequence of an energy fall, its support to the ad hoc...
The goal of this paper is to investigate the correlation between electrostatic field of Video Display Units (VDU's) generated around human head located in front of VDU and related display size. The mathematical model is based on the Laplace equation for the electrostatic potential, and corresponding finite element solution. The electrostatic field is calculated for different sizes of display and for...
Ambient networks (AN) project focuses on the convergence of heterogeneous networks over different domains. The aim (among others) is to facilitate co-operation, mobility support and multi-access between networks and terminals. One of the most important goals is to integrate the different AN-concepts together for validation. This paper presents an integrated prototype as proof-of-concepts, which can...
In this paper, a novel approach to detect electromagnetic interference from electronic equipment by means of continuous wavelet transform is presented. The algorithms of the proposed approach are given together with the software solutions. A case study is made to verify the effectiveness and correctness of this proposed approach and a "Workspace" concept is presented to interface analyzed...
Efficient mobility management involves micro-mobility principles. The performance of a representative micro-mobility approach, hierarchical mobile IPv6 (HMIPv6) protocol, is affected by the manner of mobility anchor point (MAP) selection. In this paper, we propose a new method, based on prediction of the future movement of mobile nodes (MNs). Exploiting the information about the future availability...
This paper presents results from an experimental study of TCP in a wireless 4G evaluation system. Test-bed results on transport layer performance are presented and analyzed in relation to several link layer aspects. The aspects investigated are the impact of channel prediction errors, channel scheduling, delay, and adaptive modulation switch level, on TCP performance. The paper contributes a cross-layer...
Gossip is a well-known technique for distributed computing in an arbitrarily connected network of nodes. The gossip algorithm, which is very simple to implement, takes into account strong limitations in computational, communication and energy resources that usually characterize nodes in sensor networks. In gossip, the computational burden is distributed among the nodes, and computation and communication...
The performance of a mobile network is essentially based on the capability of its radio access technology. This paper presents technical capabilities of the emerging radio access technology 1xEV-DO. Such capabilities are expressed in terms of throughputs, and are based on realistic radio and geographical parameters, as well as realistic traffic models. Simulation results enable to evaluate how environment...
Recent wireless networks offer more bandwidth than ever. High quality services are developed and provided by the operators, the number of users is constantly increasing. As the transferred data and the number of terminals are growing, the network providers have to face the increasing complexity of the network management and operation tasks. In this paper we observe the estimation and prediction of...
This paper presents architecture overview of a .NET runtime for scheduling and executing futures on modern multiprocessor machines that is based on the lazy task creation technique. The runtime is responsible for efficient load balancing of fine-grained tasks on platform's processors and allows any function accessible from .NET to be called as a future.
Orthogonal frequency division multiplexing (OFDM) system is robust against inter-symbol interference (ISI) by increasing the symbol duration. However, for high-speed application, time variation of a multipath channel result in inter-carrier interference (ICI). It leads to the performance degradation. This works propose a low-complexity successive detection algorithm combined with the techniques of...
Constant inventions in the field of distributed systems raise up the demands on network simulators. Resources needed for simulation of thousands to millions of nodes can be provided only by making simulators distributed. In the design process of distributed systems scalability and transparency present the key requirements. Some of the existing models for distributed systems can be used to model both...
The following topics are dealt with: QoS; wired networks; mobile wireless networks; EMC; ad hoc and sensor network; digital video broadcasting; Internet; IP based environment; communication software; interfaces and communication protocols; multimedia and virtual reality; telecommunication services.
The next generation of intelligent systems provides information processing, retrieval and transfer services for an arbitrary number of users in a transparent way. The structure of large networks is dynamically changing because of failures and modifications. Besides, it must support user mobility as well. The information to be handled extends beyond the traditional fixed type precise and deterministic...
Network standards are moving toward the quality-of-service (QoS) networking. Differentiated services (DiffServ) QoS model is adopted by many recent and upcoming networks standard. Applications running on these networks can specify suitable service classes to their connections or flows. The flows are then treated according to their service classes. However, current Internet applications are still designed...
Compressed images such as JPEG when transmitted over communication channels are susceptible to channel noise and/or erasure, which causes losses of blocks of pixels or macroblocks. Recovery of a large block in an image is a difficult task. In this paper we propose a novel method that addresses this problem and can exactly recover a lost block. Moreover, the proposed algorithm is fast enough to be...
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