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Estimation of the scattering of electromagnetic waves by buildings and other obstacles is very important for wireless communications in urban area. In our previous work, we have examined the diffracted fields by two horizontal edges with an arbitrary angle. In this paper, we consider the diffracted fields by two edges with an arbitrary angle which change in both horizontal and vertical directions...
Internet of Things (IoT) allows the interconnection of smart objects, such as robots, wireless sensors, and of human beings. Object recognition is a key unresolved challenge for robotics, but an Radio-Frequency Identification (RFID) or Quick Response Code (QR codes) can help in solving this problem. IoT proposes a new way of object recognition. By making objects "smart" and connected, robots...
In this paper, we investigate the performance of AODV routing protocol in a Manhattan grid scenario when sending triple flow. We considered two different scenarios with three TCP flows (TCP1xTCP2xTCP3) and one UDP flow and two TCP flows (UDPxTCP1xTCP2) and data rates of 0.1 Mbps and 1 Mbps. For the simulations, we used SUMO to generate the vehicle movement and NS3 to analyze the network performance...
In order to have an effective utilization of the radio wave resources, it is important to estimate propagation path in the urban area. In our previous works, we have shown that the shape and material of wedges do not affect the diffracted fields except the diffracted fields close to wedge surfaces. In this paper, we compare the diffracted fields of the wedges whose inner angles are 0 and a building...
Estimation of the scattering of electromagnetic waves by buildings and other obstacles is very important for wireless communications. In our previous work, we have examined the diffracted fields by two edges with an arbitrary angle which change in both horizontal and vertical directions. In this paper, we compare the diffracted fields between parallel and arbitrary angle of edges. The numerical calculation...
The trustworthiness of peers is very important for safe communication in P2P system. In this paper, we propose a fuzzy-based reliability system for P2P Communications in JXTA-Overlay. We use three input parameters: Number of Interactions (NOI), Amount of Data Exchanged (ADE), and Reputation (R) and the output is Peer Reliability (PR). We evaluate the proposed system by computer simulations. The simulation...
In order to have an effective utilization of the radio wave resources, it is important to estimate propagation path in the urban area. In our previous works, we have shown that the shape and material of wedges do not affect the diffracted fields. In this paper, we analyze the reflected and diffracted fields by one or two wedges and compare the effects that wedge shapes and materials give to the reflected...
Estimation of the scattering of electromagnetic waves by buildings and other obstacles is very important for wireless communications in urban area. In our previous work, we have examined the diffracted fields by two horizontal edges with an arbitrary angle. In this paper, we consider the diffracted fields by two edges with an arbitrary angle which change in both horizontal and vertical directions...
In this paper, we propose a fuzzy-based reliability system for P2P Communications in JXTA-Overlay. We use four input parameters: Mutually Agreed Behaviour (MAB), Actual Behaviour Criterion (ABC), Peer disconnections (PD) and Number of Uploads (NU) and the output is Peer Reliability (PR). We evaluate the proposed system by computer simulations. The simulation results show that the proposed system have...
In Wireless Sensor Networks (WSN), cluster formation and cluster head selection have a lot of advantages, such as useful energy consumption, reducing communication overhead, transmit aggregated data and so on. They can affect the network's performance in different environments with different characteristics. In this paper, we have proposed a fuzzy-based algorithm for controlling sensor speed in Wireless...
Recently many researchers are working on Peer-to-Peer (P2P) networks, which are able to overcome the firewalls, NATs and other security devices without changing the network policy. P2P architectures will be very important for future distributed systems and applications. In such networks, peers are heterogeneous in providing the services and they do not have the same competence of reliability. Therefore,...
Wireless Mesh Networks (WMNs) are important networking infrastructure for providing cost-efficient broadband wireless connectivity. Mesh router node placement is important to achieve network connectivity and coverage in such networks. In this paper, we deal with the effect of changes in population size and number of generations for node placement problem in WMNs. We consider two population sizes 8...
Peer to Peer (P2P) systems recently are receiving a lot of attention from the researchers. In such systems, peers are heterogeneous in providing resources and services. Peers do not have the same reliability so it is necessary to evaluate their trustworthiness for a reliable sharing of the resources and services. In this paper, we propose a fuzzy-based system for peer reliability in JXTA-Overlay P2P...
In Wireless Mesh Networks (WMNs), the performance of the network is affected by the location of mesh nodes. The placement of mesh nodes is an important design issue in deploying such networks. For a given grid size and a given number of mesh nodes, we use Genetic Algorithms (GAs) to find where to position the mesh nodes in order to maximize the coverage and the connectivity of the network. In this...
In order to have an effective utilization of the radio wave resources, it is important to estimate propagation path in the urban area. In our previous work, we have examined the diffracted fields by two edges with an arbitrary angle. In this paper, the characteristics of the diffracted fieldsby two horizontal edges of a building rooftop are discussed for two cases: a building without or with parapets...
Recently, there are many problems caused by global environment warming. The limited natural resources require efficient methods and systems for recycling and processing of the wastes for a better environment. One of the problems today is the processing of the kitchen garbage, because when they become in large amounts in small areas, the natural capacity of the environment can not assimilate them....
In P2P systems, evaluation of trustworthiness of the peers is very important for a safe communication. In order to decide the peer trustworthiness different parameters are needed. In this paper, we propose two fuzzy-based peer trustworthiness systems for JXTA-Overlay P2P platform. In the first system, we considered two parameters: Actual Behavior Criterion (ABC) and Reputation (R). In the second system,...
Simulation of Vehicular Ad hoc Networks(VANETs) is an important aspect of the analysis and design of intelligent routing and broadcasting protocols. In VANETs, the topology of the network changes very often, therefore implementation of efficient routing protocols is very important problem. The communication between vehicles is used for safety, comfort and for entertainment as well. The performance...
Sensor networks are a sensing, computing and communication infrastructure that are able to observe and respond to phenomena in the natural environment and in our physical and cyber infrastructure. In this paper, we investigate packet loss, routing loss and transport loss in mobile Wireless Sensor Networks (WSNs) considering AODV protocol and different radio models. We compare the simulation results...
The trustworthiness of peers is very important for safe communication in P2P system. The trustworthiness of a peer can be evaluated based on the reputation and actual behavior of peers to provide services to other peers. However, in order to decide the peer trustworthiness are needed many parameters, which make the problem NP-hard. In this paper, we propose a fuzzy-based peer trustworthiness system...
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