$N=\half$ Superstring in Zero Dimension and the Spontaneous Breakdown of   the Supersymmetry
  We propose random matrix models which have $N=\half$ supersymmetry in zero dimension. The supersymmetry breaks down spontaneously. It is shown that the double scaling limit can be defined in these models and the breakdown of the supersymmetry remains in the continuum limit. The exact non-trivial partition functions of the string theories corresponding to these matrix models are also obtained. 
Shin'ichi Nojiri