134 research outputs found
Viewpoints on emergent semantics
Authors include:Philippe Cudr´e-Mauroux, and Karl Aberer (editors),
Alia I. Abdelmoty, Tiziana Catarci, Ernesto Damiani,
Arantxa Illaramendi, Robert Meersman,
Erich J. Neuhold, Christine Parent, Kai-Uwe Sattler,
Monica Scannapieco, Stefano Spaccapietra,
Peter Spyns, and Guy De Tr´eWe introduce a novel view on how to deal with the problems of semantic interoperability in distributed systems. This view is based on the concept of emergent semantics, which sees both the representation of semantics and the discovery of the proper interpretation of symbols as the result of a self-organizing process performed by distributed agents exchanging symbols and having utilities dependent on the proper interpretation of the symbols. This is a complex systems perspective on the problem of dealing with semantics. We highlight some of the distinctive features of our vision and point out preliminary examples of its applicatio
Decision-making with Sugeno integrals: Bridging the gap between multicriteria evaluation and decision under uncertainty
International audienceThis paper clarifies the connection between multiple criteria decision-making and decision under uncertainty in a qualitative setting relying on a finite value scale. While their mathematical formulations are very similar, the underlying assumptions differ and the latter problem turns out to be a special case of the former. Sugeno integrals are very general aggregation operations that can represent preference relations between uncertain acts or between multifactorial alternatives where attributes share the same totally ordered domain. This paper proposes a generalized form of the Sugeno integral that can cope with attributes which have distinct domains via the use of qualitative utility functions. It is shown that in the case of decision under uncertainty, this model corresponds to state-dependent preferences on act consequences. Axiomatizations of the corresponding preference functionals are proposed in the cases where uncertainty is represented by possibility measures, by necessity measures, and by general order-preserving set-functions, respectively. This is achieved by weakening previously proposed axiom systems for Sugeno integrals
Fuzzy inequational logic
We present a logic for reasoning about graded inequalities which generalizes
the ordinary inequational logic used in universal algebra. The logic deals with
atomic predicate formulas of the form of inequalities between terms and
formalizes their semantic entailment and provability in graded setting which
allows to draw partially true conclusions from partially true assumptions. We
follow the Pavelka approach and define general degrees of semantic entailment
and provability using complete residuated lattices as structures of truth
degrees. We prove the logic is Pavelka-style complete. Furthermore, we present
a logic for reasoning about graded if-then rules which is obtained as
particular case of the general result
Axiomatization of Inconsistency Indicators for Pairwise Comparisons
This study proposes revised axioms for defining inconsistency indicators in
pairwise comparisons. It is based on the new findings that "PC submatrix cannot
have a worse inconsistency indicator than the PC matrix containing it" and that
there must be a PC submatrix with the same inconsistency as the given PC
matrix.
This study also provides better reasoning for the need of normalization. It
is a revision of axiomatization by Koczkodaj and Szwarc, 2014 which proposed
axioms expressed informally with some deficiencies addressed in this study.Comment: This paper should have been withdrawn by the first author a long time
ago. The work has been finished with another researcher, I have been pushed
out the projec
A Fuzzy-Mining Approach for Solving Rule Based Expert System Unwieldiness in Medical Domain
Over the years, one of the challenges of a rule based expert system is the possibility of evolving a compact and
consistent knowledge-base with a fewer numbers of rules that are relevant to the application domain, in order to
enhance the comprehensibility of the expert system. In this paper, the hybrid of fuzzy rule mining interestingness
measures and fuzzy expert system is exploited as a means of solving the problem of unwieldiness and maintenance
complication in the rule based expert system. This negatively increases the knowledge-base space complexity and
reduces rule access rate which impedes system response time. To validate this concept, the Coronary Heart Disease risk
ratio determination is used as the case study. Results of fuzzy expert system with a fewer numbers of rules and fuzzy
expert system with a large numbers of rules are presented for comparison. Moreover, the effect of fuzzy linguistic
variable risk ratio is investigated. This makes the expert system recommendation close to human perception
Some views on information fusion and logic based approaches in decision making under uncertainty
Decision making under uncertainty is a key issue in information fusion and logic based reasoning approaches. The aim of this paper is to show noteworthy theoretical and applicational issues in the area of decision making under uncertainty that have been already done and raise new open research related to these topics pointing out promising and challenging research gaps that should be addressed in the coming future in order to improve the resolution of decision making problems under uncertainty
Pivotal decompositions of functions
We extend the well-known Shannon decomposition of Boolean functions to more
general classes of functions. Such decompositions, which we call pivotal
decompositions, express the fact that every unary section of a function only
depends upon its values at two given elements. Pivotal decompositions appear to
hold for various function classes, such as the class of lattice polynomial
functions or the class of multilinear polynomial functions. We also define
function classes characterized by pivotal decompositions and function classes
characterized by their unary members and investigate links between these two
concepts
Sensitivity Analysis
In Operations Research, sensitivity analysis describes the methods and tools used to study how the output of a model varies with changes in the input data. The input data may refer toparameters affecting the objective functions and/or constraints or to the structure of the problem. Depending on the problem and model, the output could refer to:
* the optimal alternative and/or the optimal value, or,
* a set of alternatives with a certain property. Some examples include the non-dominated set in a multi-objective optimization problem; the set of alternatives satisfying certain constraints in a classification problem; or the set of the, say, five best alternatives.
Typical questions addressed within sensitivity analysis are whether a given optimal solution will remain as such if inputs are changed in a certain way, and,if not, which other alternatives may become optimal. Finding the most critical directions for changes in inputs that may affect the model output are also relevant sensitivity analysis issues, see French and Ríos Insua (2000), Saltelli et al (2000), and Saltelli et al. (2004) for reviews
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