To find out how does the performance of A-greedy* change with respect to the frequency of the occurred changes, we repeat the above experiment changing the filter drop probabilities abruptly every 200K and 50K tuples respectively.
The occurred changes may be abrupt or gradual.
On this ground ageing characteristics of the tested materials were possible to be defined, which describe occurred changes and can be useful for durability assessment.
The final two experiments aim to study the behavior of the novel monitoring phase when the occurred changes are gradual and either the number of filters (Experiment 6) or the per-tuple filter processing cost (Experiment 7) changes.
The reason for which we observe a 9%% higher overall cost improvement comparing with the case where the changes are abrupt (see the upper part of Table 3, column 2) is due to the fact that now A-greedy becomes more insensitive to the occurred changes.
The consequently occurred changes in inner cell wall structure including damaging, increase of porosity and loss of mechanical resistance were also found to enhance enzyme access to cellulose and further sugar yield.
