I have the following code:
\documentclass[journal]{IEEEtran}
\usepackage{tikz}
\usetikzlibrary{shapes,backgrounds}
\begin{figure}[ht]
\begin{tikzpicture}
\node[rounded corners, draw, fill=gray!20 ,text height = 5cm,minimum width=9cm] (main){All Feasible Schedules};
\node[ellipse, draw, fill=red!20, text height =3cm, minimum width = 8cm] at (main.center) (semi) {Semi-Active Schedules};
\node[ellipse, draw,fill=red!35, text height = 1.5cm, minimum width = 5cm] at (main.center) (active) {Active Schedules};
\node[ellipse, draw, fill=red!42,align=left, anchor=east, xshift=-0.5cm ] at (active.east) (non) {Non-delay\\Schedules};
\end{tikzpicture}
\end{figure}
Which gives:

How can I get the text semi-active schedules, and active schedules to nestle snugly at the bottom of their respective ellipses?
