On the other hand, there are full automated methods, which don't involve user interaction. the unsupervised approach is feasible if the goal is to extract from a huge number of Web resources.
I didn't use "on one hand" before it, I just want to introduce a comparison with the supervised (semi-automated) methods which involve user interaction and has described in the previous paragraph.
Is my usage correct? especially that I used "on the other hand, there are ...", should I say something like "on the other side, there are ..." or "on the other end, there are ..."?!