A system to promote connectivity for inter-radio access technology handover from a first radio access network to a second radio access network is provided. The elastic member has a relatively small elastic modulus according to the state that the torsion angle between the first and second members is small. A further aspect of the present invention relates to an in vitro method of identifying and separating oligodendrocyte progenitor cells from a mixed population containing other mammalian brain or spinal cord cell types. The first and second MIM capacitors have individual upper and lower electrode plates and different compositions of capacitor dielectric layers. According to the present invention, the recognition rate of the alignment key formed on the substrate can be increased, resulting in improved accuracy in a micro electro mecanical system process for forming micro probes on the substrate, thereby improving productivity and reliability of the substrate and the probe card incluing the same. In this embodiment, the bit lines may be formed on the metal layers.