Neighborhood systems-based rough sets in incomplete information system

On some types of neighborhood-related covering rough sets

“…Topological concepts and methods have also been applied as useful tools to study the rough sets and covering rough sets [17,[25][26][27]. The covering rough set models have been demonstrated to be useful in the discovery of decision rules from the incomplete information systems [28].…”

Bipolar fuzzy rough set model on two different universes and its application

“…Many proposals have been put forward for generalizing and interpreting rough sets. For example, rough set model is extended to arbitrary binary relations [41,51,58,66,67] and coverings [18,45,50,65,67,68]. Dubois and Prade [14] first introduced the concepts of rough fuzzy set and fuzzy rough set by combining fuzzy sets [72] and rough sets.…”

Graded rough set model based on two universes and its properties

“…And Yao and Lin [10,11] presented a graded rough set model (GRS) from the absolute quantitative point of view. Moreover, many other models have also been proposed, such as rough set models based on arbitrary binary relations [12][13][14]40], rough set models based on incomplete systems [15][16][17]43], covering rough sets [18][19][20], rough fuzzy sets and fuzzy rough sets [21,42,44], variable precision rough sets [22,23], etc. Through loosening the strict definition of the approximations in Pawlak's rough set model, these models enrich the application scope of rough set theory.…”