A. Central Node
The structure of a central node is shown as Fig. 1. The
function of each section is as below:
1) Blackboard Storage Area
Blackboard storage area is a global data area. It is used to
store global and partial solutions of problem solving. All
nodes can access information on blackboard storage area and
exchange data through it. It is a hierarchical structure and
divided by some levels each of which includes some data
items [4]. Meanwhile, some indexes are built to organize
solutions on every level.
2) Knowledge Source Set
Every knowledge source in knowledge source set is an
independent individual and a running unit of problem
solving. The higher level solutions are generated on
blackboard storage area by lower level solutions with the
running of knowledge source until a final result is got.
Knowledge source representation is shown as the table1