The communication range of devices within a mobile ad hoc network is inherently restricted. One way of enhancing the communication range of a mobile ad hoc network, is to interconnect it to a wired network like the internet, thus forming a heterogeneous wired cum wireless network. This interconnection also enables mobile nodes to access internet services, and is achieved through gateways. Mobile nodes in the ad hoc network need to discover and register with a gateway in order to obtain Internet connectivity. Gateway discovery mechanisms called proactive, reactive and hybrid exist to enable mobile nodes to register with internet gateways. In the recent times, few optimizations have been proposed to the existing gateway discovery mechanisms in order to make gateway discovery by mobile nodes efficient. In this paper, we present a detailed survey of the state of the art in gateway discovery and selection mechanisms
Ontologies play a crucial role in bringing the Semantic Web vision to its full potential. Ontologies are developed at different levels of abstraction and by different people for various purposes. Knowledge represented by the ontologies is scattered because of existence of many ontologies representing the same concepts, therefore it becomes difficult to analyse, study and use the knowledge spread across many ontologies if they are studied individually. Knowledge represented by ontologies can be combined into a single ontology which is shown in this paper. Ontologies can be merged to combine the knowledge from different ontologies. In this paper we have shown the merger of two ontologies first ontology is university second ontology is the Student profile ontology containing details of Student which were developed in educational domain. Ontologies were developed and merged using protégé 4.0 alpha tools.
Quite a few strategies have been proposed for integrating mobile ad hoc networks and the Internet. A need has been felt for an analytical model that would facilitate a formal definition and comparison of different integration strategies without actually implementing them in a simulated environment. In this paper, we present an analytical framework based on the concept of a Relay Path Set (RPS). This model can be used to describe, compare the different strategies for integrating mobile Ad Hoc networks and the Internet, propose new strategies and suggest improvements in the existing strategies at different module levels. The proposed model has been applied on a few of the existing Integration strategies and performance comparison has also been made. We also discuss the future work that can be carried out using the proposed framework
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