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Attribute reduction is one of the key problems in rough set theory, and many algorithms based on discernibility matrix have been proposed and studied about it. Unfortunately, the existing algorithms have much higher space complexity. In order to reduce the computational complexity of discernibility matrix method, a novel condensing tree (C-Tree in short) is introduced for storing the same elements...
Relative internal efficiency is an important economic index which reflects characteristics of flow passage equipments of turbine. This paper analyzed the concepts of relative internal efficiency and cylinder efficiency, and deduced relation-model for them. On the one hand, one new method was put forward to calculate relative internal efficiency. On the other hand, this model could also represent the...
Aiming at the characteristic of continuous calculation in on-line performance monitoring system of power units, this paper analyzed the dynamic property and inherent mechanism of reheat unit in load-changing procedure. In order to ensure the accuracy of the calculation, real-time arithmetic models were put forward and compared with conventional method to study the influence on performance index in...
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