KEYWORD SEARCH OVER PROBABILISTIC RDF GRAPHS

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1 ABSTRACT KEYWORD SEARCH OVER PROBABILISTIC RDF GRAPHS In many real applications, RDF (Resource Description Framework) has been widely used as a W3C standard to describe data in the Semantic Web. In practice, RDF data may often suffer from the unreliability of their data sources, and exhibit errors or inconsistencies. In this paper, we model such unreliable RDF data by probabilistic RDF graphs, and study an important problem, keyword search query over probabilistic RDF graphs (namely, the pg-kws query). To retrieve meaningful keyword search answers, we design the score rankings for subgraph answers specific for RDF data. Furthermore, we propose effective pruning methods (via offline pre-computed score bounds and probabilistic threshold) to quickly filter out false alarms. We construct an index over the pre-computed data for RDF, and present an efficient query answering approach through the index. Extensive experiments have been conducted to verify the effectiveness and efficiency of our proposed approaches. EXISTING SYSTEM

2 The keyword search on deterministic (general) graphs, to our best knowledge, no prior works studied the pg-kws problem on probabilistic RDF graphs. While the feature score uses a hybrid of structural and IR scores that are similar to existing ranking scores,the entropy score can reflect our preference to keyword distributions over RDF subgraph entities. The existing works on keyword search over RDF graphs often assume that, labels of vertices in RDF graphs are certain. There are some existing works on modeling probabilistic RDF data. PROPOSE SYSTEM we propose effective pruning methods (via offline pre-computed score bounds and probabilistic threshold) to quickly filter out false alarms. Extensive experiments have been conducted to verify the effectiveness and efficiency of our proposed approaches. proposed to answer keyword search queries on certain graphs.

3 we can transform probabilistic RDF graph with uncertain vertex/edge keywords to the one with uncertain keywords in vertices only, to which we apply our proposed approaches. we will utilize this entropy concept to propose a metric that can indicate our preference to RDF keyword search results in probabilistic RDF graphs. we will propose two pruning strategies, score bound pruning and probabilistic pruning, which utilize score bounds or probabilistic threshold, respectively, to enable the pruning. our proposed pruning methods via score bounds. we propose a heuristicbased algorithm, which obtains w PWGs of a probabilistic subgraph g with low cost. we report the experimental results of our proposed approaches for answering pg-kws queries on both real and synthetic data. The proposed techniques explored pruning methods with graph structures and matching probabilities. various probabilistic queries over uncertain data have been proposed, including probabilistic range query (PRQ), nearest neighbor

4 (PNN), reverse nearest neighbor (PRNN), skyline (PSQ), reverse skyline (PRSQ), and similarity join.(psj). The bidirectional search, which uses the pre-computed distance between keywords and nodes, and obtains the bounds of ranking scores to enable fast pruning and retrieval. ALGORITHM Inspired by the complexity of finding a good PWG partitioning, we propose a heuristicbased algorithm, which obtains w PWGs of a probabilistic subgraph g with low cost. We execute the randomized algorithm for iter rounds, and select the one with the lowest cost as the output of function F( ). our PWG partitioning algorithm will iteratively obtain PWG partitioning strategy PS(i; j),as well as its corresponding cost PS(i; j):cost. Specifically, the algorithm maintains a cost matrix, cost matrix, in which each element cost matrix[i][j] = PS(i; j):cost for i j.

5 The time complexity of the algorithm is given by O( V (g) w C), where C is the cost to evaluate the cost model. SYSTEM CONFIGURATION SOFTWARE REQUIREMENTS: Operating System : Windows Technology : Java and J2EE Web Technologies : Html, JavaScript, CSS IDE : My Eclipse Web Server : Tomcat Tool kit : Android Phone Database : My SQL Java Version : J2SDK1.5 HARDWARE REQUIREMENTS: Hardware : Pentium

6 Speed : 1.1 GHz RAM : 1GB Hard Disk : 20 GB Floppy Drive : 1.44 MB Key Board : Standard Windows Keyboard Mouse : Two or Three Button Mouse Monitor : SVGA IMPLEMENTATION: Implementation is the stage of the project when the theoretical design is turned out into a working system. Thus it can be considered to be the most critical stage in achieving a successful new system and in giving the user, confidence that the new system will work and be effective. The implementation stage involves careful planning, investigation of the existing system and it s constraints on implementation, designing of methods to achieve changeover and evaluation of changeover methods. MODULE DESCRIPTION:

7 Number of Modules; After careful analysis the system has been identified to have the following modules: 1. Keyword searching based Social Authentication Module 2. Security Module 3. Search Module 4. Graph Module 1.Keyword searching based Social Authentication Module: A Keyword -based social authentication includes two phases, User Phase: The system prepares keyword searching for a user registration in this phase. Specifically, this is first authenticated with her main authenticator (i.e., password) and then a few(e.g., 5) friends, who also have accounts in the system, are selected by either herself or the service provider from registration friend list and are appointed as Keyword searching.

8 Admin Phase: The Admin is using for files upload for system. Specifically, this is which file is more then seeing is ease to findout. 2.Security Module: Authentication is essential for securing your account and preventing spoofed messages from damaging your online reputation. Imagine a phishing being sent from your mail because someone had forged your information. Angry recipients and spam complaints resulting from it become your mess to clean up, in order to repair your reputation. keywordsearching-based social authentication systems ask users to select their own trustees without any constraint. In our experiments we show that the service provider can constrain keywordsearching selections via imposing that no users are selected as keywordsearching by too many other users, which can achieve better security guarantees. 3.Search Module we use a measure, which is the (summed) difference between upper and lower score bounds for keyword pairs (or keywords).

9 Different from leaf nodes, aggregates in non-leaf nodes summarize bounds or keyword existence information for all possible worlds of graphs (rather than w PWGs). Thus, we do not need to record existence Intuitively, probabilistic r-radius graphs with similar keywords tend to have similar score bounds. This way, tree nodes on different levels can be iteratively built until a final root is obtained we randomly generate m possible keywords (each keyword is hashed to an integer within range [1; 100]), as well as conditional probability tables (CPTs) that depend on vertex keywords from its incoming edges, where m is randomly picked up within [1; 5] by default. We tested two types of distributions for uncertain vertex keywords, Uniform and Skew and denote their corresponding data sets as Uniform and Skew, respectively. 4.Graph Module Which file is more than searching show the graph. we first generate a schema graph, by producing vertices that represent RDF entities, and randomly connecting vertices via directed edges, where the averages of vertex out-degrees and in-degrees are set to by default. CONCLUSIONS: In this paper, we formulate and tackle an important problem of keyword search over probabilistic RDF graphs, called pg-kws queries. We

10 propose effective pruning methods via offline pre-computed score bounds and probabilistic threshold to quickly filter out false alarms. Moreover, we construct an index for the pre-computed data for RDF, and present an efficient query answering approach. Extensive experiments have been conducted to verify the effectiveness and efficiency of our proposed approaches.

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