Aggregating T-equivalence relations

This contribution deals with the problem of aggregating Tequivalence relations, in the sense that we are looking for functions that preserve reflexivity, symmetry, and transitivity with respect to a given t-norm T. We obtain a complete description of those functions in terms of that we call T-triangular triplets. Any extra condition on the t-norm is assumed.Postprint (published version

Aggregating fuzzy subgroups and T-vague groups

Fuzzy subgroups and T-vague groups are interesting fuzzy algebraic structures that have been widely studied. While fuzzy subgroups fuzzify the concept of crisp subgroup, T-vague groups can be identified with quotient groups of a group by a normal fuzzy subgroup and there is a close relation between both structures and T-indistinguishability operators (fuzzy equivalence relations). In this paper the functions that aggregate fuzzy subgroups and T-vague groups will be studied. The functions aggregating T-indistinguishability operators have been characterized [9] and the main result of this paper is that the functions aggregating T-indistinguishability operators coincide with the ones that aggregate fuzzy subgroups and T-vague groups. In particular, quasi-arithmetic means and some OWA operators aggregate them if the t-norm is continuous Archimedean.Peer ReviewedPostprint (author's final draft

Preserving T-transitivity

This contribution deals with the problem of aggregating T-equivalence relations, in the sense that we are looking for functions that preserve reflexivity, symmetry and transitivity with respect to a given t-norm T. Under any extra condition on the t-norm, we obtain a complete description of those functions in terms of that we call T-triangular triplets.Peer ReviewedPostprint (author's final draft

Quimio-radioterapia sequencial no carcinoma pulmonar não de pequenas células: estudo retrospectivo de 100 doentes

ABSTRACTCombined chemotherapy and radiotherapy has shown to be the correct treatment of unresectable non-small cell lung cancer, aier many years of poor survival figures with standard radiotherapy alone. It has also been demonstrated that the benefit of chemotherapy is mainly achieved if cisplatin-based schedules are used. The authors present a retrospective study of 100 cases of stage III non-small cell lung cancer treated with a sequential approach of chemotherapy and radiotherapy and evaluate median and overall survival, local progression-free survival and distant progression-free survival.The results of our series are quite similar to those published in literature.REV PORT PNEUMOL 2003; IX (3): 215-22