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Optimal Threshold Control by the Robots of Web Search Engines With Obsolescence of Documents

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Executive Summary

A typical web search engine consists of three principal parts: crawling engine, indexing engine, and searching engine. The paper aims to optimize the performance of the crawling engine. The crawling engine finds new web pages and updates web pages existing in the database of the web search engine. The crawling engine has several robots collecting information from the Internet. The authors first calculate various performance measures of the system (e.g., probability of arbitrary page loss due to the buffer overflow, probability of starvation of the system, the average time waiting in the buffer). Intuitively, they would like to avoid system starvation and at the same time to minimize the information loss.

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