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ABSTRACT: The large amount of information on web is stored in backend databases which are not indexed by traditional search engines. Such databases are referred to as Hidden web databases and extraction of this hidden web content is a potential research area as the pages are dynamically created through search query interfaces. However, direct query through this search interface is laborious way to search. Hence, there has been increased interest in retrieval and integration of hidden web data with a view to give high quality information to the web user. This paper proposes a novel approach that identifies Web page templates and the tag structures of a document in order to extract structured data from hidden web sources as the results returned in response to a user query are typically presented using template generated Web pages.
International Journal of Computer Applications. 01/2011;
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ABSTRACT: Many crucial applications of MANETs like the battlefield, conference and disaster recovery defines the needs for group communications either one-to-many or many-to-many form. Multicast plays an important role in bandwidth scarce multihop mobile ad hoc networks comprise of limited battery power mobile nodes. Multicast protocols in MANETs generate many controls overhead for maintenance of multicast routingstructures due to frequent changes of network topology. Bigger multicast tables for the maintenance of network structures resultsin inefficient consumption of bandwidth of wireless links andbattery power of anemic mobile nodes, which in turn, pose thescalability problems as the network size is scaled up. However,many MANET applications demands scalability from time to time. Multicasting for MANETs, therefore, needs to reduce the state maintenance. As a remedy to these shortcomings, this paper roposes an overlay multicast protocol on application layer. In the proposed protocol titled “Scalable Overlay Multicasting in Mobile Ad Hoc Networks (SOM)” the network nodes construct overlay hierarchical framework to reduce the protocols states and constrain their distribution within limited scope. Based on zone around each node, it constructs a virtual structure at application layer mapped with the physical topology at network layer, thus formed two levels of hierarchy. The concept of two level hierarchies reduces the protocol state maintenance and hence supports the vertical scalability. Protocol depends on the location information obtained using a distributed location service, which effectively reduces the overhead for route searching and updating the source based multicast tree.
International Journal on Computer Science and Engineering. 01/2010;
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ABSTRACT: Ontologies are useful tool for data integration across heterogeneous data sets and the importance of ontologies is already widespread, yet ontology building is comparatively a less absorbed concept.Ontology specifies a set of vocabulary for a particular problem domain emphasizing on the meaning of terms. The motive of employing ontologies in semantic web directly relates to unabated change in thelanguages, which are being used to describe a problem. This switch among various languages directly changes the terms used in the definition of problem assuming that the meaning conveyed will be similar to former. However the semantics might change inevitably and the purpose of upgrading a language gets defeated. Therefore the ontological databases were introduced to overcome this issue. Although the general design structure of ontological database is still pending. The premise of this paper is to propose a designstructure for the development of ontological database in general. Also, a case study has been presented to analyze the proposed structure.
International Journal of Engineering Science and Technology. 01/2010;
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ABSTRACT: Intruders damage or steal valuable information by either bypassing security tools or penetrating through them, necessitating the need to detect such intrusion attempts especially in case of multi-event based distributed attacks spanning over a considerable amount of time. In this paper ecology of agents is being suggested that uses class hierarchy to define complex intrusions. The source and target containers produced thereof are analyzed for possible intrusion attempts thereby rendering the proposed system self-monitoring, robust, secure and reliable.
International Journal of Computer Applications. 01/2010;
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ABSTRACT: Indexing in search engines has been an active area of current researches. The main aim of search engines is to provide most relevant documents to the users in minimum possible time. So granting efficient and fast accesses to the index is a major issue for performances of Web Search Engines. Indexing is performed on the web pages after they have been gathered into a repository by the crawler. The existing architecture of search engine shows that the index is built on the basis of the terms of the document and consists of an array of the posting lists where each posting list is associated with a term and contains the term as well as the identifiers of the documents containing the term. The current information retrieval systems use terms to describe documents and search engines. This paper proposes an indexing structure in which index is built on the basis of context of the document rather than on the terms basis using ontology. The ontology-based collection selection method presented in this paper uses context to describe collections and search engines. The context of the documents being collected by the crawler in the repository is being extracted by the indexer using the context repository, thesaurus and ontology repository and then documents are indexed according to their respective context.
International Journal of Computer Applications. 01/2010;
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ABSTRACT: Today’s network management systems, mostly based on SNMP or CMIP management protocols, suffer from scalability and flexibility problems as it involve the transmission of large amount of management data towards the centralized management station for processing. In the event of network stress (e.g. generation of lots of fault data or performance monitoring data) it overloads the management station. A distributed paradigm is a viable solution to perform management functions when network start growing significantly. In this sense, use of mobile agents offer many possibilities for designing the next generation of distributed network management systems. They decentralize processing and control thereby reducing the management traffic around the management station and distribute processing load. This paper discusses and analyzes the key advantages and application of mobile agents in the distributed network management systems.
International Journal of Advancements in Technology. 01/2010;
