Another solution to the bear problem that I haven't seen so far is quite
simple, and works well in the United States.
 
If the bear is destroying hives and hurting a commercial operation, go to the
state Fish and Game Department and talk to them about a depredation permit.
 Get the permit, take your rifle, and shoot the bear.
 
I don't know whether this option is available to non-commercial beekeepers,
but it's the best system that I have seen here in California.  You just have
to have the time to do it.
 
Kevin