[Tex/LaTex] Different equation position control in the two column paper

equationsfloats

In two column paper, I have long equations. I want one of the equations to be appear at the bottom of the current page. I have another equation which I want to be appear at the top of the second page.
How I can control these equation positions?

I provide below example.

\documentclass[journal]{IEEEtran}

\usepackage{amsmath}
\usepackage{lipsum}

\begin{document}

\title{\huge equation position control in two column paper}

\maketitle

\section{First} \label{first}

\lipsum[1-6]

\textbf{We need the first equation appear at the bottom of the first page.} 

\begin{figure*}[!btp]
\normalsize
\begin{align} \label{eqn_first}
first & = aaa aaa aaa aaa + aaa aaa aaa aaa aaa aaa aaa aaa + aaa aaa aaa aaa aaa aaa + aaa aaa aaa aaa
\end{align}
\hrulefill
\vspace*{4pt}
\end{figure*}

\lipsum[2-5]

\section{Second} \label{second}

\lipsum[3-8]

\textbf{We need the second equation appear at the top of the second page.}

\begin{figure*}[!tbp]
\normalsize
\begin{align} \label{eqn_second}
second & = bbb bbb bbb bbb bbb bbb + bbb bbb bbb bbb bbb bbb bbb bbb bbb +bbb bbb bbb bbb bbb bbb bbb bbb +bbb bbb bbb bbb bbb 
\end{align}
\hrulefill
\vspace*{4pt}
\end{figure*}

\lipsum[4-8]

\end{document}

Best Answer

enter image description here

\documentclass[journal]{IEEEtran}

\usepackage{amsmath}
\usepackage{lipsum}
\usepackage{stfloats}

\begin{document}


\title{\huge equation position control in two column paper}

\maketitle
\enlargethispage{-2cm}


\section{First} \label{first}

\begin{picture}(0,0)
\put(0,-600){\hspace{-\parindent}\parbox{\textwidth}{%
\hrulefill
\vspace*{4pt}
\normalsize
\begin{align} \label{eqn_first}
first & = aaa aaa aaa aaa + aaa aaa aaa aaa aaa aaa aaa aaa + aaa aaa aaa aaa aaa aaa + aaa aaa aaa aaa
\end{align}}}
\end{picture}%
\begin{figure*}[!tbp]
\normalsize
\begin{align} \label{eqn_second}
second & = bbb bbb bbb bbb bbb bbb + bbb bbb bbb bbb bbb bbb bbb bbb bbb +bbb bbb bbb bbb bbb bbb bbb bbb +bbb bbb bbb bbb bbb 
\end{align}
\vspace*{4pt}
\hrulefill
\end{figure*}%
\lipsum[1-6]

\textbf{We need the first equation appear at the bottom of the first page.}
\enlargethispage{-2cm}


\lipsum[2-5]

\section{Second} \label{second}

\lipsum[3-8]

\textbf{We need the second equation appear at the top of the second page.}



\lipsum[4-8]

\end{document}
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