Informatics Publishing Limited

A. Vadivel ¹, S. G. Shaila ¹, R. Devi Mahalakshmi ¹, J. Karthika ¹

Affiliations
1 Multimedia Information Retrieval Group, Department of Computer Applications, National Institute of Technology, Tamilnadu, IN

Abstract

Designing and developing an effective web crawler is a challenging role in a large search engine. This paper proposes component based web crawler along with the indexer. The WebCrawler consist of crawler services and indexer services and realized as web services. The communication between the services is sent and received using XML, SOAP and WSDL. In the crawler service, the web pages are fetched and parsed for retrieving all the hyperlinks. The process is carried out recursively using Breadth-First strategy. The extracted URLs are downloaded and those web pages are sent to the indexer services by passing the message. In the indexer service, HTML pages are parsed, stop words are removed, stemming of keywords are carried out as pre-processing steps and the result is stored in the form of inverted index. We have evaluated the performance of the proposed design specification of the crawler with indexer and found that the number of pages retrieved is notably on the higher side.

Keywords

Inverted Index, Tokenization, URL, Web Crawler, Web Service.

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R. Rubia Gandhi ¹, J. Karthika ¹

Affiliations
1 Department of Electrical and Electronics Engineering, Sri Krishna college of Engineering and Technology, Kuniamuthur, Coimbatore, IN

Abstract

This paper presents the PI controller based CUK converter and transformer less H5 inverter for grid connected photovoltaic power generating system. For the maximum power point tracking of the photovoltaic system, P&O based algorithm has been implemented. The Pi controller for the CUK MPPT scheme shows a regulated output in variable load conditions. A classical H-bridge inverter topology with extra fifth switch has been used to connect the single phase grid. For the traditional grid connected PV inverter system, a transformer is utilized to provide the galvanic isolation between the grid and PV system. But Common mode leakage current increases due to the removal of the transformer from the system. Here, this transformer less H5 inverter is used for the proposed system which suppresses the common mode leakage current thereby improving the power conversion efficiency and decreases the grid current distortion. The removal of the transformer from the grid tied PV inverter system will give an improvement in the efficiency factor and reduces the cost of the system. The performance of the proposed system is tested in MATLAB/SIMULINK software and the simulation results are included for the effective demonstration of the converter and inverter efficiency. The results of the grid voltage and grid current have been analyzed and the total harmonic distortion of the PV inverter system has been verified.

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