A local phase compress scheme is applied to suppress spiral and spatiotemporal chaos in the Fitzhugh-Nagumo and Panfilov systems. In the numerical investigation, the compress signal is limited to a small area in order to control the global spiral and spatiotcmporal chaos with or without noise. The simulation shows that the system becomes homogeneous stable within a few of 50 time units. A practical control of defibrillation and pattern formation is discussed.

A new spin glass model defined on the N×N 2-dimensional random lattice with the SO (3) spin variables is proposed, and. studied by Monte Carlo simulations. The thermodanamics, such as the internal energy and specific heat per spin and the topological excition are calculated. The thermal hysteresis and mix-phase runs are also made to obtain some information of the Phase transitions. A higher-order, instead of the usual first-or second-order, Phase transition due to the vortex condensation is found. Moreover, the results show the important frustration and disorder effects which are main causes of low-temperature properties of sPin glass.