Strandon Prediction

Predict if two consecutive strands are in one strandon or two different strandon.

I have to think a way to predict it.
so I try to gain some idea by reading papers.
1. predict beta turn.
2. predict alpha turn. (use 21D array, PSI-BLAST position matrix) by using similar idea, we might create another position array.
3. predict strands

ideas:
1. maybe we can use HB residue pairs info. tool1 tool2