  We have tried to measure $|V_{ub}|$ using inclusive semileptonic decay
measurements with three different methods. The full reconstruction tag is the
one of the most feasible method to measure inclusive process. Semileptonic
$B\to D^{(*)}\ell\nu$ tag is another method to separate signal and tag $B$
mesons. New kinematic variable is used to enhance double semileptonic decays of
both $B$ meson. We also improve the neutrino reconstruction technique solving a
combination of decay products into signal and tag $B$ mesons using the
simulated annealing method.
