\alignauthor
NAME A\\
       \affaddr{University of Twente}\\
       \affaddr{P.O. Box 217, 7500AE Enschede}\\
       \affaddr{The Netherlands}\\
       \email{x}
\alignauthor
NAME B\\
       \affaddr{x}\\
       \affaddr{x}\\
       \affaddr{x}\\
       \email{x}
	\alignauthor
NAME C\\
       \affaddr{x}\\
       \affaddr{x}\\
       \affaddr{x}\\
       \email{x}
}

Mijn versie:

\documentclass{sig-alternate-br}
\usepackage{algorithmic}
\usepackage{algorithm}

\renewcommand{\algorithmicrequire}{\textbf{Input:}}
\renewcommand{\algorithmicensure}{\textbf{Output:}}

\begin{document}
\conferenceinfo{15$^{th}$ Twente Student Conference on IT}{June 20$^{th}$, 2011, Enschede, The Netherlands.}
\CopyrightYear{2011} % Allows default copyright year (200X) to be over-ridden - IF NEED BE.

\title{Interaction between SPH Fluids and Dynamic Particle-Based Objects using CUDA}

\author{
\alignauthor
    O\u{g}uz Meteer\\
       \affaddr{University of Twente}\\
       \affaddr{P.O. Box 217, 7500AE Enschede}\\
       \affaddr{The Netherlands}\\
       \email{o.meteer@student.utwente.nl}
\and
\alignauthor
    E.E. Kunst\\
        \affaddr{Vrest Medical}\\
        \affaddr{Institutenweg 38, 7521PK Enschede}\\
        \affaddr{The Netherlands}\\
        \email{ekunst@vrest.nl}
\and
\alignauthor
    A.J.B. Sanders\\
        \affaddr{Vrest Medical}\\
        \affaddr{Institutenweg 38, 7521PK Enschede}\\
        \affaddr{The Netherlands}\\
        \email{asanders@vrest.nl}
}

\maketitle