  We propose an Ising machine made of microelectromechanical systems (MEMS),
where the annealing process is automatically executed by a dissipation
mechanism. The core structure is a series of buckled plates. Two stable
positions of each plate (left and right) represent its binary state acting as a
bit so that a plate works as a mechanical memory. The electrostatic interaction
between adjacent plates is introduced by applying voltage. Plates continue to
flip between two stable buckled positions until the series of plates reaches a
local minimum due to the damping of the mechanical motion. \red{First, we
design Ising machines simulating a ferromagnetic (FM) interaction and an
antiferromagnetic (AF) interaction separately. Then, we propose a
fully-connected MEMS\ network representing a coexistence system of FM and AF
interactions in an arbitrary way, by way of which an arbitrary combinatorial
problem described by the Ising model can be solved.} The present mechanism
works at room temperature without external magnetic field, which is very
different from the standard classical or quantum annealing mechanism.
