Rozeta Miho

Impact of Source and Destination Movement on MANET Performance Considering BATMAN and AODV Protocols

In recent years, MANETs are continuing to attract the attention for their potential use in several fields such as military activities, rescue operations and time-critical applications. In this paper, we present the implementation and analysis of our implemented MANET testbed considering AODV and BATMAN protocols for wireless multi-hop networking. We investigate the effect of mobility and topology changing in MANET. We evaluate the performance of the routing protocols through experiments in real environment. In this work, we consider four scenarios: Static, Source Moving, Destination Moving and Source-Destination Moving. We assess the performance of our testbed in terms of throughput, number of dropped packets and delay. We found that, when routes are changing often, the BATMAN has better performance than AODV because it put the packets in a buffer. While, because AODV is a reactive protocol, it introduces some delay in the network.

An Annealing Approach to Router Nodes Placement Problem in Wireless Mesh Networks

Mesh router nodes placement is a central problem to Wireless Mesh Networks (WMNs). An efficient placement of mesh router nodes is indispensable for achieving network performance in terms of both network connectivity and user coverage. Unfortunately the problem is computationally hard to solve to optimality even for small deployment areas and a small number of mesh router nodes. As WMNs are becoming an important networking infrastructure for providing cost-efficient broadband wireless connectivity, researchers are paying attention to the resolution of the mesh router placement problem through heuristic approaches in order to achieve near optimal, yet high quality solutions in reasonable time. In this work we propose and evaluate a Simulated Annealing (SA) approach to placement of mesh router nodes in WMNs. The optimization model uses two maximization objectives, namely, the size of the giant component in the network and user coverage. Both objectives are important to deployment of WMNs; the former is crucial to achieve network connectivity while the later is an indicator of the QoS in WMNs. The SA approach distinguishes for its simplicity yet its policy of neighborhood exploration allows to reach promising areas of the solution space where quality solutions could be found. We have experimentally evaluated the SA algorithm through a benchmark of generated instances, varying from small to large size, and capturing different characteristics of WMNs such as topological placements of mesh clients. The experimental results showed the efficiency of the annealing approach for the placement of mesh router nodes in WMNs.

A new system for supporting children with autism spectrum disorder based on IoT and P2P technology

In this paper, we implement and evaluate the performance of a new system based on internet of things (IoT) and P2P technology for supporting learning and improving the quality of life for children with autism spectrum disorder (ASD). Many children with autism are highly interested and motivated by smart devices such as computers and touch screen tablets. These types of assistive technology devices get children with autism to interact, make choices, respond, and tell parents what they are interested, need, think, and maybe even feel. Our proposed system uses JXTA-Overlay platform and SmartBox device to monitor the children and create P2P communication between children, caregivers and therapists. Various visual systems, such as objects, photographs, realistic drawings, line drawings, and written words, can be used with assorted modes of technology, as long as the child can readily comprehend the visual representation. Vocabulary skills, mathematics skills and other life skills can be taught through our proposed system. We evaluated the effect of our system during study sessions of children diagnosed with ASD. The experimental results show that our system supports engaged learning and the SmartBox increases and maintains the concentration of children with ASD during studying.

Evaluation of an Intelligent Fuzzy-Based Cluster Head Selection System for WSNs Using Different Parameters

Cluster formation and cluster head selection are important problems in sensor network applications and can drastically affect the networks communication energy dissipation. However, selecting of the cluster head is not easy in different environments which may have different characteristics. In our previous work, in order to deal with this problem, we proposed a power reduction algorithm for sensor networks based on fuzzy logic and number of neighbour nodes. We call this algorithm F3N. In this paper, we evaluate F3N and LEACH by many simulation results. We evaluate the performance of our proposed system for tree different parameters: Remaining Battery Power of Sensor (RPS), Degree of Number of Neighbour Nodes (D3N), and Distance from Cluster Centroid (DCC). From the simulation results, we found that the probability of a sensor node to be a cluster head is increased with increase of number of neighbour nodes and remained battery power and is decreased with the increase of distance from the cluster centroid.

MANET performance for source and destination moving scenarios considering OLSR and AODV protocols

Recently, a great interest is shown in MANETs potential usage and applications in several fields such as military activities, rescue operations and time-critical applications. In this work, we implement and analyse a MANET testbed considering AODV and OLSR protocols for wireless multi-hop networking. We investigate the effect of mobility and topology changing in MANET and evaluate the performance of the network through experiments in a real environment. The performance assessment of our testbed is done considering throughput, number of dropped packets and delay. We designed four scenarios: Static, Source Moving, Destination Moving and Source-Destination Moving. From our experimental results, we concluded that when the communicating nodes are moving and the routes change quickly, OLSR (as a proactive protocol) performs better than AODV, which is a reactive protocol.

Hybrid algorithms for independent batch scheduling in grids

Grid computing has emerged as a wide area distributed paradigm for solving large-scale problems in science, engineering, etc. and is known as the family of eScience grid-enabled applications. Computing planning of incoming jobs efficiently with available machines in the grid system is the main requirement for optimised system performance. One version of the problem is that of independent batch scheduling, in which jobs are assumed to be independent and are scheduled in batches aimed at minimising the makespan and flowtime. Given the hardness of the problem, heuristics are used to find high quality solutions for practical purposes of designing efficient grid schedulers. Recently, considerable efforts were spent in implementing and evaluating not only stand-alone heuristics and meta-heuristics, but also their hybridisation into even higher level algorithms. In this paper, we present a study on the performance of two popular algorithms for the problem, namely Genetic Algorithms (GAs) and Tabu Search (TS) and two hybridisations involving them, namely, the GA (TS) and GA-TS, which differ in the way the main control and cooperation among GA and TS are implemented. The hierarchic and simultaneous optimisation modes are considered for the bi-objective scheduling problem. Evaluation is done using different grid scenarios generated by a grid simulator. The computational results showed that the hybrid algorithm outperforms both the GA and TS for the makespan parameter, but not for the flowtime parameter.

Performance Evaluation of Wireless Mobile Ad-Hoc Network via NS-3 Simulator

A Mobile Ad-hoc Network (MANET) is a collection of wireless mobile terminals that are able to dynamically form a temporary network without any aid from fixed infrastructure or centralized administration. In recent years, they are continuing to attract the attention for their potential use in several fields. Mobility and the absence of any fixed infrastructure make MANETs very attractive for mobility and rescue operations and time-critical applications. In this paper, we concentrate on performance evaluation of MANETs via ns-3 network simulator. We compare the throughput simulation results for grid topology using ns-2 and ns-3 and runtime of simulation.

Implementation of CAVENET and its usage for performance evaluation of AODV, OLSR and DYMO protocols in vehicular networks

Vehicle Ad-hoc Network (VANET) is a kind of Mobile Ad-hoc Network (MANET) that establishes wireless connection between cars. In VANETs and MANETs, the topology of the network changes very often, therefore implementation of efficient routing protocols is very important problem. In MANETs, the Random Waypoint (RW) model is used as a simulation model for generating node mobility pattern. On the other hand, in VANETs, the mobility patterns of nodes is restricted along the roads, and is affected by the movement of neighbour nodes. In this paper, we present a simulation system for VANET called CAVENET (Cellular Automaton based VEhicular NETwork). In CAVENET, the mobility patterns of nodes are generated by an 1-dimensional cellular automata. We improved CAVENET and implemented some routing protocols. We investigated the performance of the implemented routing protocols by CAVENET. The simulation results have shown that DYMO protocol has better performance than AODV and OLSR protocols.

Performance Evaluation of a Wireless Sensor Network Considering Mobile Event

Presently, there are many research work for sensor networks. In our previous work, we implemented a simulation system for sensor networks. But, we considered that the event node is stationary in the observation field. However, in many applications the event node may move. For example, in an ecology environment the animals can move randomly. In this work, we want to investigate how the sensor network performs in the case when the event node moves. We carried out the simulations for lattice topology and TwoRayGround radio model considering AODV and DSR protocols. We compare the simulation results for two cases: when the event node is mobile and stationary. The simulation results have shown that the routing efficiency for the case of mobile event node is better than the stationary event node using AODV protocol. Also, the goodput for the mobile event node case does not change too much compared with the stationary event case using AODV,but the goodput is not good when the number of nodes is increased.

Effects of Source and Destination Movement on MANET Performance Considering OLSR and AODV Protocols

In recent years, MANETs are continuing to attract the attention for their potential use in several fields such as military activities, rescue operations and time-critical applications. In this paper, we present the implementation and analysis of our implemented MANET testbed considering AODV and OLSR protocols for wireless multi-hop networking. We investigate the effect of mobility and topology changing in MANET. In this work, we consider four scenarios: Static, Source Moving, Destination Moving and Source-Destination Moving. We assess the performance of our testbed in terms of throughput, number of dropped packets and delay. From our experiments, we found that OLSR protocol has a better performance than AODV when both source and destination nodes are moving. AODV as a reactive protocol, is slower than OLSR when routes are changing quickly and continuously.