Information retrieval (IR) has changed considerably in recent years with the expansion of the
World Wide Web and the advent of modern and inexpensive graphical user interfaces and …

Modeling large scale Web Search Engines (WSEs) is a complex task. It involves many
issues such as representing user's behavior, query traffic, several strategies and heuristics …

This paper proposes a Colored Petri Net model capturing the behaviour of vertical search
engines. In such systems a query submitted by a user goes through different stages and can …

This paper proposes using Coloured Petri Nets to model performance of vertical search
engines for Web search. In such systems, queries submitted by users or client systems are …

Capacity planning studies are suitable for supporting decision making in management and
operation of Web search engines deployed on large clusters of processors. Among many …

In this invited talk we address the algorithmic problems behind a truly distributed Web
search engine. The main goal is to reduce the cost of a Web search engine while keeping all …

This article presents a summary of the main activities of the Database & Information Systems
Research Group at Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) and the …

We present in this report a summary of the main results produced in the five years of the
GERINDO research project. The aim of this project is to address the increasing demand for …

Abstract This article summarizes Information Retrieval (IR) research conducted at the
Universidade Federal de Minas Gerais (UFMG), over more than a quarter of a century. The …

Temporal distribution of the web query traffic has a significant influence on the performance
and scalability of large scale information systems. Most of the existing performance analysis …