\documentclass[a4paper,10pt]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}		% écrire avec les accents
\usepackage[french]{babel}
\usepackage{multimedia}
\usepackage{graphicx}
\usepackage{color}
\usepackage{epsfig}
\usepackage{eepic}
\usepackage{pstricks}

%opening
\title{asdf}
\author{asdf}

\begin{document}

\maketitle

\begin{abstract}
asdf
\end{abstract}

\section{dsaf}
\input{Echantillonage}

\input{Quantification}

\end{document}