\documentclass[a4paper,10pt]{article}
\usepackage{amssymb}        % needed for math
\usepackage{amsmath}        % needed for math
\usepackage{amsthm}         % needed for proof environment
\usepackage[utf8]{inputenc} % this is needed for umlauts
\usepackage[ngerman]{babel} % this is needed for umlauts
\usepackage[T1]{fontenc}    % this is needed for correct output of umlauts in pdf
\usepackage{wasysym}  % checkbox
\usepackage{array}    % row height
\usepackage[landscape]{geometry}
\geometry{top=1.5cm,left=1cm,right=1cm,bottom=2cm}
 
\pdfinfo{
   /Author (Martin Thoma)
   /Title  (Semesterplan)
   /Subject (Semesterplan)
   /Keywords (Semesterplan)
}

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% Variables                                        %
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\newcommand{\semester}{Wintersemester}
\newcommand{\jahr}{2012}
\newcommand{\student}{Martin Thoma}
 
\begin{document}
\section*{Semesterplan für das \semester~\jahr~von~\student} 

\begin{table}[h]
	\setlength{\extrarowheight}{4.5pt}
    \begin{tabular}{ |l|p {1.9 cm}|p {1.9 cm}|p {1.9 cm}|p {1.9 cm}|p {1.9 cm}|p {1.9 cm}|p {1.9 cm}|p {1.9 cm}|p {1.9 cm}|p {1.9 cm}|p {1.9 cm}|}
        \hline
        ~           & \textbf{Ü1} & \textbf{Ü2} & \textbf{Ü3} & \textbf{Ü4} & \textbf{Ü5} & \textbf{Ü6} & \textbf{Ü7} & \textbf{Ü8} & \textbf{Ü9} & \textbf{Ü10} & $\sum$ \\
        \hline
        \hline
        LA II       & 144 & ~ & ~ & ~ & ~ & ~ & ~ & ~ & ~ & ~ & ~ \\
        \hline
        Analysis II & ~ & ~ & ~ & ~ & ~ & ~ & ~ & ~ & ~ & ~ & ~ \\
        \hline
        Algo        & ~ & ~ & ~ & ~ & ~ & ~ & ~ & ~ & ~ & ~ & ~ \\
        \hline
        SWT         & ~ & ~ & ~ & ~ & ~ & ~ & ~ & ~ & ~ & ~ & ~ \\
        \hline
        Rechner     & ~ & ~ & ~ & ~ & ~ & ~ & ~ & ~ & ~ & ~ & ~ \\
        \hline
    \end{tabular}
\end{table}

\end{document}