  Three topics of monopole dynamics in gluodynamics are presented. 1)Gauge
(in)dependence of the monopole effective action (S.Ito, T.W.Park, T.Suzuki):
Four different abelian projections are studied. MA and Laplacian abelian gauges
show almost the same renormalization flow and renormalized trajectory. 2)The
quantized dual abelian Higgs model (DAH) derived from SU(2) gluodynamics and
its vacuum structure (Y.Koma, E.-M.Ilgenfritz, T.Suzuki,M.I.Polikarpov):
Monte-Carlo analysis of DAH is done. The quantum average of the dual field
strength shows a flux tube profile similar to the color-electric field profile
measured in SU(2) gluodynamics. 3)Lattice instanton action from 3D SU(2)
Georgi-Glashow model (GG)$_3$ (T.Yazawa, T.Suzuki): (GG)$_3$ is studied on the
lattice in the London limit. We determine an effective instanton action both in
unitary and MA gauges. For some range of parameters, we obtain almost perfect
actions which look the same in both gauges (gauge independence) and which
reproduce well the string tension.
