A note on variable threshold concept lattices: Threshold-based operators are reducible to classical concept-forming operators

2007 ◽  
Vol 177 (15) ◽  
pp. 3186-3191 ◽  
Author(s):  
R BELOHLAVEK
Keyword(s):  
Classical Concept ◽  
Concept Lattices ◽  
Variable Threshold ◽  
Threshold Concept

Variable threshold concept lattices

2007 ◽  
Vol 177 (22) ◽  
pp. 4883-4892 ◽  
Author(s):  
Wen-Xiu Zhang ◽  
Jian-Min Ma ◽  
Shi-Qing Fan
Keyword(s):  
Concept Lattices ◽  
Variable Threshold ◽  
Threshold Concept

The connections between three-way and classical concept lattices

2016 ◽  
Vol 91 ◽  
pp. 143-151 ◽  
Author(s):  
Jianjun Qi ◽  
Ting Qian ◽  
Ling Wei
Keyword(s):  
Classical Concept ◽  
Concept Lattices

scholarly journals Rule Reductions of Decision Formal Context Based on Mixed Information

2021 ◽  
Author(s):  
Yidong Lin ◽  
Jinjin Li ◽  
Ju Huang
Keyword(s):  
Concept Lattice ◽  
Decision Rules ◽  
Negative Information ◽  
Formal Context ◽  
Classical Concept ◽  
Weak Basis ◽  
Concept Lattices ◽  
Rule Acquisition ◽  
Decision Formal Context

Abstract Three-way concept lattice extracts knowledge from positive and negative information separately. However, some applications require to mix positive and negative information for management and representation explicitly. In this paper, rule acquisition of FCA is extended based on mixed information. Firstly, two types of mixed concept lattices are studied. Then the relationships between mixed concept and classical concept, three-way concept are explored in depth. Secondly, mixed decision rules are investigated thoroughly. And the weak-basis is put forward to approximate to the basis of mixed decision rules. Finally, the comparison of mixed decision rules and three-way decision rules is perfectly discussed.

scholarly journals Trans-lithospheric diapirism explains the presence of ultra-high pressure rocks in the European Variscides

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Petra Maierová ◽  
Karel Schulmann ◽  
Pavla Štípská ◽  
Taras Gerya ◽  
Ondrej Lexa
Keyword(s):  
High Pressure ◽  
Numerical Models ◽  
Classical Concept ◽  
Plate Interface ◽  
Ultra High Pressure ◽  
Common Process ◽  
Mountain Belts ◽  
Collisional Orogens ◽  
Rock Association ◽  
European Variscides

AbstractThe classical concept of collisional orogens suggests that mountain belts form as a crustal wedge between the downgoing and overriding plates. However, this orogenic style is not compatible with the presence of (ultra-)high pressure crustal and mantle rocks far from the plate interface in the Bohemian Massif of Central Europe. Here we use a comparison between geological observations and thermo-mechanical numerical models to explain their formation. We suggest that continental crust was first deeply subducted, then flowed laterally underneath the lithosphere and eventually rose in the form of large partially molten trans-lithospheric diapirs. We further show that trans-lithospheric diapirism produces a specific rock association of (ultra-)high pressure crustal and mantle rocks and ultra-potassic magmas that alternates with the less metamorphosed rocks of the upper plate. Similar rock associations have been described in other convergent zones, both modern and ancient. We speculate that trans-lithospheric diapirism could be a common process.

scholarly journals Gradation of Fuzzy Preconcept Lattices

Axioms ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 41
Author(s):  
Alexander Šostak ◽  
Ingrīda Uļjane ◽  
Māris Krastiņš
Keyword(s):  
Fuzzy Information ◽  
Concept Lattices ◽  
Practical Applications ◽  
Fuzzy Concept ◽  
The One ◽  
Practical Nature

Noticing certain limitations of concept lattices in the fuzzy context, especially in view of their practical applications, in this paper, we propose a more general approach based on what we call graded fuzzy preconcept lattices. We believe that this approach is more adequate for dealing with fuzzy information then the one based on fuzzy concept lattices. We consider two possible gradation methods of fuzzy preconcept lattice—an inner one, called D-gradation and an outer one, called M-gradation, study their properties, and illustrate by a series of examples, in particular, of practical nature.

scholarly journals COVID-19 cytokine storm syndrome: a threshold concept

2021 ◽  
Vol 2 (2) ◽  
pp. e49-e50 ◽  
Author(s):  
Luke Y C Chen ◽  
Tien T T Quach
Keyword(s):  
Cytokine Storm ◽  
Threshold Concept

Threshold Concept Pedagogy for Antiracist Social Studies Teaching

2021 ◽  
Vol 23 (2) ◽  
pp. 87-94
Author(s):  
William L. Smith ◽  
Ryan M. Crowley ◽  
Sara B. Demoiny ◽  
Jenna Cushing-Leubner
Keyword(s):  
Social Studies ◽  
Threshold Concept ◽  
Social Studies Teaching
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