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In the area of mobile ad hoc and sensor networks, simulation became the evaluation method of choice. Due to the high number of variables - including transmission range, number of nodes, simulation area, mobility pattern-simulation settings vary largely from work to work, depending on the application scenario focused. The results for two simulations with identical setting, but different mobility models,...
In ad hoc and sensor networks, spatial communication constraints have a tremendous influence on many aspects of network performance. The network behavior becomes easily unpredictable with an increasing number of nodes and connections. Therefore, simulation is the evaluation method of choice for ad hoc and sensor networks. Simulations of wireless networks, however, encounter two challenges: First,...
Recently advanced computer have brought real-time three dimension object simulation running in high speed. In numerical method, the explicit integration method still remains the problem of stability while the implicit integration method suffers from high memory storage. Especially in mass spring system, the calculation time becomes large for the complex models. When interval time step becomes large,...
This paper is a work in progress report on the information inconsistency problem inherent to hybrid networks. Hybrid networks consist of ad hoc or wireless sensor networks supported by a backbone network. We introduce the concept of consistency degree as a measure of information consistency in such a network. By using this measure backbone links can potentially be managed and self-organized to equilibrate...
Ad hoc networks, sensor network, vehicular networks, delay tolerant networks, etc. are instances of dynamic communication networks. These networks are in particular characterized by spontaneous link failures caused by node mobility or connection problems in the wireless medium. It is a challenging task to manage networking in a dynamic environment. Ideally, important tasks and processes have to be...
In this paper, we introduce HyLearn, a cooperative learning system for mobile devices running on a hybrid wireless network. HyLearn deploys information to interested nodes through both fixed as well as mobile networks. Due to the mobility of nodes, an efficient approach for self-organization the ad hoc network is required. For that, we apply a multi-hop clustering technique that forms hierarchical...
Today's computer-based annotation systems implement a wide range of functionalities that often go beyond those available in traditional paper-and- pencil annotations. Conceptually, annotation systems are based on thoroughly investigated psycho-sociological and pedagogical learning theories. They offer a huge diversity of annotation types that can be placed in textual as well as in multimedia format...
Topology control (TC) aims at tuning the topology of highly dynamic networks to provide better control over network resources and to increase the efficiency of communication. Recently, many TC protocols have been proposed. The protocols are designed for preserving connectivity, minimizing energy consumption, maximizing the overall network coverage or network capacity. Each TC protocol makes different...
Ad-hoc networks, a promising trend in wireless technology, fail to work properly in a global setting. In most cases, self-organization and cost-free local communication cannot compensate the need for being connected, gathering urgent information just-in-time. Equipping mobile devices additionally with GSM or UMTS adapters in order to communicate with arbitrary remote devices or even a fixed network...
Clustering techniques create hierarchal network structures, called clusters, on an otherwise flat network. In a dynamic environment-in terms of node mobility as well as in terms of steadily changing device parameters-the clusterhead election process has to be re-invoked according to a suitable update policy. Cluster re-organization causes additional message exchanges and computational complexity and...
Clustering techniques create hierarchal network structures, called clusters, on an otherwise flat network. Neighboring devices elect one appropriate device as clusterhead. Due to the dynamic environment, clusterhead selection becomes an important issue. We consider the problem of appropriate clusterhead selection in wireless ad-hoc networks and sensor networks. This work presents topological criteria...
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