18 results on '"Sanz, José Antonio"'
Search Results
2. CC-integrals: Choquet-like Copula-based aggregation functions and its application in fuzzy rule-based classification systems.
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Lucca, Giancarlo, Sanz, José Antonio, Dimuro, Graçaliz Pereira, Bedregal, Benjamín, Asiain, Maria José, Elkano, Mikel, and Bustince, Humberto
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INTEGRAL calculus , *ELLIPTIC integrals , *GENERALIZED integrals , *PSYCHOLOGICAL typologies , *TEMPERAMENT - Abstract
This paper introduces the concept of Choquet-like Copula-based aggregation function (CC-integral) and its application in fuzzy rule-based classification systems. The standard Choquet integral is expanded by distributing the product operation. Then, the product operation is generalized by a copula. Unlike the generalization of the Choquet integral by t-norms using its standard form (i.e., without distributing the product operator), which results in a pre-aggregation function, the CC-integral satisfies all the conditions required for an aggregation function. We build some examples of CC-integrals considering different examples of copulas, including t-norms, overlap functions and copulas that are neither t-norms nor overlap functions. We show that the CC-integral based on the minimum t-norm, when applied in fuzzy rule-based classification systems, obtains a performance that is, with a high level of confidence, better than that which adopts the winning rule (maximum). We concluded that the behavior of CC-integral is similar to the best Choquet-like pre-aggregation function. Consequently, the CC-integrals introduced in this paper can enlarge the scope of the applications by offering new possibilities for defining fuzzy reasoning methods with a similar gain in performance. [ABSTRACT FROM AUTHOR]
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- 2017
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3. A methodology for controlling the information quality in interval-valued fusion processes: Theory and application.
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da Cruz Asmus, Tiago, Sanz, José Antonio, Dimuro, Graçaliz Pereira, Fernandez, Javier, Mesiar, Radko, and Bustince, Humberto
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INFORMATION resources management , *QUALITY control - Published
- 2022
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4. Leukoplakia, skin pigmentation and microcephaly in a 4‐year‐old boy.
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Giacaman, Aniza, Salinas Sanz, José Antonio, Navarro Noguera, Samuel, Roldan Busto, Jordi, and Martín‐Santiago, Ana
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YEAR , *LEUKOPLAKIA , *MICROCEPHALY , *ANIMAL coloration , *FETAL growth retardation , *LYMPHOPENIA - Abstract
A 4-year-old boy was referred for asymptomatic thrombocytopenia for several months associated with abnormal pigmentation and leukoplakia. A germline homozygous missense mutation was identified in I RTEL1 i (regulator of telomere elongation helicase 1) for which variant c.296T>G was detected. Unraveling the pathogenesis of Hoyeraal-Hreidarsson syndrome, a complex telomere biology disorder. [Extracted from the article]
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- 2020
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5. Improving the performance of fuzzy rule-based classification systems with interval-valued fuzzy sets and genetic amplitude tuning
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Sanz, José Antonio, Fernández, Alberto, Bustince, Humberto, and Herrera, Francisco
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FUZZY sets , *ALGORITHMS , *FUZZY algorithms , *END users (Information technology) , *SET theory , *COMPUTER science , *ARTIFICIAL intelligence , *ELECTRONIC data processing , *GENETIC algorithms - Abstract
Abstract: Among the computational intelligence techniques employed to solve classification problems, Fuzzy Rule-Based Classification Systems (FRBCSs) are a popular tool because of their interpretable models based on linguistic variables, which are easier to understand for the experts or end-users. The aim of this paper is to enhance the performance of FRBCSs by extending the Knowledge Base with the application of the concept of Interval-Valued Fuzzy Sets (IVFSs). We consider a post-processing genetic tuning step that adjusts the amplitude of the upper bound of the IVFS to contextualize the fuzzy partitions and to obtain a most accurate solution to the problem. We analyze the goodness of this approach using two basic and well-known fuzzy rule learning algorithms, the Chi et al.’s method and the fuzzy hybrid genetics-based machine learning algorithm. We show the improvement achieved by this model through an extensive empirical study with a large collection of data-sets. [Copyright &y& Elsevier]
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- 2010
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6. Prominent venous circulation and thick lips in an 8‐year‐old boy with congenital neutropenia.
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Giacaman, Aniza, Salinas Sanz, José Antonio, Navarro Noguera, Samuel, Díaz de Heredia Rubio, Cristina, and Martín‐Santiago, Ana
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LIPS , *THERAPEUTICS , *RESPIRATORY infections - Abstract
The article present a case study of a 8-year-old boy with prominent venous vessels and hyperlaxity. It mentions on his physical examination, he had a triangular face, long philtrum, thick lips aphthous stomatitis, periodontitis, and a prominent venous circulation on his trunk and extremities; and also mentions with the clinical and laboratory findings, test of the G6PC3 gene was performed on peripheral blood and revealed a homozygous 1-bp deletion in the exon 2.
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- 2019
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7. Exserohilum rostratum, a rare cause of opportunistic skin infection in children: Case report and review of the literature.
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Gracia‐Darder, Inés, Garcías‐Ladaria, Joan, Salinas Sanz, José Antonio, Saus Sarrias, Carles, and Martín‐Santiago, Ana
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SKIN infections , *OPPORTUNISTIC infections , *LITERATURE reviews , *DERMATOMYCOSES , *ACUTE leukemia - Abstract
Exserohilum species are environmental molds that may rarely cause skin and nasal infections, especially in immunocompromised children. We present a 3‐year‐old girl with acute leukemia who presented with a skin infection caused by Exserohilum rostratum. Previously published cases of skin infections by Exserohilum spp. in children are reviewed. [ABSTRACT FROM AUTHOR]
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- 2020
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8. Towards interval uncertainty propagation control in bivariate aggregation processes and the introduction of width-limited interval-valued overlap functions.
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da Cruz Asmus, Tiago, Pereira Dimuro, Graçaliz, Bedregal, Benjamín, Sanz, José Antonio, Mesiar, Radko, and Bustince, Humberto
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LINEAR orderings , *IMAGE processing , *FUZZY sets , *MEMBERSHIP functions (Fuzzy logic) - Abstract
Overlap functions are a class of aggregation functions that measure the overlapping degree between two values. They have been successfully applied as a fuzzy conjunction operation in several problems in which associativity is not required, such as image processing and classification. Interval-valued overlap functions were defined as an extension to express the overlapping of interval-valued data, and they have been usually applied when there is uncertainty regarding the assignment of membership degrees, as in interval-valued fuzzy rule-based classification systems. In this context, the choice of a total order for intervals can be significant, which motivated the recent developments on interval-valued aggregation functions and interval-valued overlap functions that are increasing to a given admissible order, that is, a total order that refines the usual partial order for intervals. Also, width preservation has been considered on these recent works, in an intent to avoid the uncertainty increase and guarantee the information quality, but no deeper study was made regarding the relation between the widths of the input intervals and the output interval, when applying interval-valued functions, or how one can control such uncertainty propagation based on this relation. Thus, in this paper we: (i) introduce and develop the concepts of width-limited interval-valued functions and width limiting functions, presenting a theoretical approach to analyze the relation between the widths of the input and output intervals of bivariate interval-valued functions, with special attention to interval-valued aggregation functions; (ii) introduce the concept of (a , b) -ultramodular aggregation functions, a less restrictive extension of one-dimension convexity for bivariate aggregation functions, which have an important predictable behaviour with respect to the width when extended to the interval-valued context; (iii) define width-limited interval-valued overlap functions, taking into account a function that controls the width of the output interval and a new notion of increasingness with respect to a pair of partial orders (≤ 1 , ≤ 2) ; (iv) present and compare three construction methods for these width-limited interval-valued overlap functions, considering a pair of orders (≤ 1 , ≤ 2) , which may be admissible or not, showcasing the adaptability of our developments. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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9. A constructive framework to define fusion functions with floating domains in arbitrary closed real intervals.
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Asmus, Tiago da Cruz, Dimuro, Graçaliz Pereira, Bedregal, Benjamín, Sanz, José Antonio, Fernandez, Javier, Rodriguez-Martinez, Iosu, Mesiar, Radko, and Bustince, Humberto
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GROUP decision making , *CONVOLUTIONAL neural networks , *TRIANGULAR norms - Abstract
Fusion functions and their most important subclass, aggregation functions, have been successfully applied in fuzzy modeling. However, there are practical problems, such as classification via Convolutional Neural Networks (CNNs), where the data to be aggregated are not modeling membership degrees in the unit interval. In this scenario, systems could benefit from the application of operators defined in domains different from [ 0 , 1 ] , although, presenting similar behavior of some aggregation functions whose subclasses are currently defined only in the fuzzy context (e.g., overlap functions and t-norms). So, the main objective of this paper is to present a general framework to characterize classes of fusion functions with floating domains, called (a , b) -fusion functions, defined on any closed real interval [ a , b ] , based on classes of core fusion functions defined on [ 0 , 1 ]. The fundamental aspect of this framework is that the properties of a core fusion function are preserved in the context of the analogous (a , b) -fusion function. Construction methods are presented, and some properties are studied. We also introduce a framework to define fusion functions in which the inputs come from an interval [ a , b ] but the output is mapped on a possibly different interval [ c , d ]. Finally, we present an illustrative example in image classification via CNNs. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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10. A constructive framework to define fusion functions with floating domains in arbitrary closed real intervals.
- Author
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Asmus, Tiago da Cruz, Dimuro, Graçaliz Pereira, Bedregal, Benjamín, Sanz, José Antonio, Fernandez, Javier, Rodriguez-Martinez, Iosu, Mesiar, Radko, and Bustince, Humberto
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GROUP decision making , *CONVOLUTIONAL neural networks , *TRIANGULAR norms - Abstract
Fusion functions and their most important subclass, aggregation functions, have been successfully applied in fuzzy modeling. However, there are practical problems, such as classification via Convolutional Neural Networks (CNNs), where the data to be aggregated are not modeling membership degrees in the unit interval. In this scenario, systems could benefit from the application of operators defined in domains different from [ 0 , 1 ] , although, presenting similar behavior of some aggregation functions whose subclasses are currently defined only in the fuzzy context (e.g., overlap functions and t-norms). So, the main objective of this paper is to present a general framework to characterize classes of fusion functions with floating domains, called (a , b) -fusion functions, defined on any closed real interval [ a , b ] , based on classes of core fusion functions defined on [ 0 , 1 ]. The fundamental aspect of this framework is that the properties of a core fusion function are preserved in the context of the analogous (a , b) -fusion function. Construction methods are presented, and some properties are studied. We also introduce a framework to define fusion functions in which the inputs come from an interval [ a , b ] but the output is mapped on a possibly different interval [ c , d ]. Finally, we present an illustrative example in image classification via CNNs. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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- View/download PDF
11. The state-of-art of the generalizations of the Choquet integral: From aggregation and pre-aggregation to ordered directionally monotone functions.
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Dimuro, Graçaliz Pereira, Fernández, Javier, Bedregal, Benjamín, Mesiar, Radko, Sanz, José Antonio, Lucca, Giancarlo, and Bustince, Humberto
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GENERALIZATION , *MONOTONIC functions , *GENERALIZED integrals , *AGGREGATION operators , *INTEGRALS , *INTERSECTION graph theory - Abstract
• We make a revision of recent generalizations of the Choquet integral that appear in the literature. • We show some of the most relevant theoretical features of these extensions. • We also discuss some applications where these extensions have provided good results. In 2013, Barrenechea et al. used the Choquet integral as an aggregation function in the fuzzy reasoning method (FRM) of fuzzy rule-based classification systems. After that, starting from 2016, new aggregation-like functions generalizing the Choquet integral have appeared in the literature, in particular in the works by Lucca et al. Those generalizations of the Choquet integral, namely C T -integrals (by t-norm T), C F -integrals (by a fusion function F satisfying some specific properties), CC -integrals (by a copula C), C F 1 F 2 -integrals (by a pair of fusion functions (F 1 , F 2) under some specific constraints) and their generalization gC F 1 F 2 -integrals, achieved excellent results in classification problems. The works by Lucca et al. showed that the aggregation task in a FRM may be performed by either aggregation, pre-aggregation or just ordered directional monotonic functions satisfying some boundary conditions, that is, it is not necessary to have an aggregation function to obtain competitive results in classification. The aim of this paper is to present and discuss such generalizations of the Choquet integral, offering a general panorama of the state of the art, showing the relations and intersections among such five classes of generalizations. First, we present them from a theoretical point of view. Then, we also summarize some applications found in the literature. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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12. Generalized [formula omitted]-integrals: From Choquet-like aggregation to ordered directionally monotone functions.
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Dimuro, Graçaliz Pereira, Lucca, Giancarlo, Bedregal, Benjamín, Mesiar, Radko, Sanz, José Antonio, Lin, Chin-Teng, and Bustince, Humberto
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AGGREGATION operators , *GENERALIZATION , *TRIANGULAR norms , *ORDERED sets , *INTEGRALS - Abstract
This paper introduces the theoretical framework for a generalization of C F 1 F 2 -integrals, a family of Choquet-like integrals used successfully in the aggregation process of the fuzzy reasoning mechanisms of fuzzy rule based classification systems. The proposed generalization, called by g C F 1 F 2 -integrals, is based on the so-called pseudo pre-aggregation function pairs (F 1 , F 2) , which are pairs of fusion functions satisfying a minimal set of requirements in order to guarantee that the g C F 1 F 2 -integrals to be either an aggregation function or just an ordered directionally increasing function satisfying the appropriate boundary conditions. We propose a dimension reduction of the input space, in order to deal with repeated elements in the input, avoiding ambiguities in the definition of g C F 1 F 2 -integrals. We study several properties of g C F 1 F 2 -integrals, considering different constraints for the functions F 1 and F 2 , and state under which conditions g C F 1 F 2 -integrals present or not averaging behaviors. Several examples of g C F 1 F 2 -integrals are presented, considering different pseudo pre-aggregation function pairs, defined on, e.g., t-norms, overlap functions, copulas that are neither t-norms nor overlap functions and other functions that are not even pre-aggregation functions. [ABSTRACT FROM AUTHOR]
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- 2020
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13. General overlap functions.
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De Miguel, Laura, Gómez, Daniel, Rodríguez, J. Tinguaro, Montero, Javier, Bustince, Humberto, Dimuro, Graçaliz P., and Sanz, José Antonio
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GENERALIZATION , *BEHAVIOR - Abstract
As a generalization of bivariate overlap functions, which measure the degree of overlapping (intersection for non-crisp sets) of n different classes, in this paper we introduce the concept of general overlap functions. We characterize the class of general overlap functions and include some construction methods by means of different aggregation and bivariate overlap functions. Finally, we apply general overlap functions to define a new matching degree in a classification problem. We deduce that the global behaviour of these functions is slightly better than some other methods in the literature. [ABSTRACT FROM AUTHOR]
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- 2019
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14. General interval-valued overlap functions and interval-valued overlap indices.
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Asmus, Tiago da Cruz, Dimuro, Graçaliz Pereira, Bedregal, Benjamín, Sanz, José Antonio, Pereira, Sidnei, and Bustince, Humberto
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MEMBERSHIP functions (Fuzzy logic) , *FUZZY sets , *DECISION making , *IMAGE processing , *DEFINITIONS , *GROUP decision making - Abstract
Overlap functions are aggregation functions that express the overlapping degree between two values. They have been used both as a conjunction in several practical problems (e.g., image processing and decision making), and to generate overlap indices between two fuzzy sets, which can be used to construct fuzzy confidence values to be applied in fuzzy rule based classification systems. Some generalizations of overlap functions were recently proposed, such as n-dimensional and general overlap functions, which allowed their application in n-dimensional problems. More recently, the concept of interval-valued overlap functions was presented, mainly to deal with uncertainty in providing membership functions. In this paper, we introduce: (i) the concept of n-dimensional interval-valued overlap functions, studying their representability, (ii) the definition of general interval-valued overlap functions, providing their characterization and some construction methods. Moreover, we also define the concept of interval-valued overlap index, as well as some constructing methods. In addition, we show an illustrative example where those new concepts are applied. [ABSTRACT FROM AUTHOR]
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- 2020
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15. Enhancing evolutionary fuzzy systems for multi-class problems: Distance-based relative competence weighting with truncated confidences (DRCW-TC).
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Fernández, Alberto, Elkano, Mikel, Galar, Mikel, Sanz, José Antonio, Alshomrani, Saleh, Bustince, Humberto, and Herrera, Francisco
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FUZZY systems , *EVOLUTIONARY algorithms , *CLASSIFICATION algorithms , *DATA mining , *SUPPORT vector machines - Abstract
Classification problems with multiple classes suppose a challenge in Data Mining tasks. There is a difficulty inherent to the learning process when trying to find the most adequate discrimination functions among the different concepts within the dataset. Using Fuzzy Rule Based Classification Systems in general, and Evolutionary Fuzzy Systems in particular, provide the advantage of describing smoother borderline areas, thanks to the linguistic label-based representation. In multi-classification, the pairwise learning approach (One-vs-One) has gained a notorious attention. However, there is certain dependence between the goodness of the confidence degrees or scores of binary classifiers, and the final performance shown by the global model. Regarding this fact, the problem of non-competent classifiers is of special relevance. It occurs when a binary classifier outputs a positive score for a couple of classes unrelated with the input example, which may degrade the final accuracy. Precisely, the previously exposed properties of fuzzy classifiers make them more prone to the former condition. In this paper, we propose an extension of the distance-based combination strategy to overcome this non-competence problem. It is based on the truncation of the confidence degrees of the classes prior to the distance-based tuning. This allows taking advantage of the good classification abilities of Evolutionary Fuzzy Systems, while diminishing the adverse effect of the aforementioned non-competence. Experimental results, using FARC-HD with overlap functions as the fuzzy learning algorithm, show that this new adaptation of the Distance-based Relative Competence Weighting model outperforms both the OVO and standard distance-based approaches, and it is competitive with robust classifiers such as Support Vector Machines. [ABSTRACT FROM AUTHOR]
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- 2016
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16. Using the Choquet Integral in the Fuzzy Reasoning Method of Fuzzy Rule-Based Classification Systems.
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Barrenechea, Edurne, Bustince, Humberto, Fernandez, Javier, Paternain, Daniel, and Sanz, José Antonio
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CHOQUET theory , *FUZZY logic , *AGGREGATION (Statistics) , *GENETIC algorithms , *AXIOMS - Abstract
In this paper we present a new fuzzy reasoning method in which the Choquet integral is used as aggregation function. In this manner, we can take into account the interaction among the rules of the system. For this reason, we consider several fuzzy measures, since it is a key point on the subsequent success of the Choquet integral, and we apply the new method with the same fuzzy measure for all the classes. However, the relationship among the set of rules of each class can be different and therefore the best fuzzy measure can change depending on the class. Consequently, we propose a learning method by means of a genetic algorithm in which the most suitable fuzzy measure for each class is computed. From the obtained results it is shown that our new proposal allows the performance of the classical fuzzy reasoning methods of the winning rule and additive combination to be enhanced whenever the fuzzy measure is appropriate for the tackled problem. [ABSTRACT FROM AUTHOR]
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- 2013
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17. New Liquid Crystalline Materials Based on Two Generations of Dendronised Cyclophosphazenes.
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Jiménez, Josefina, Laguna, Antonio, Gascón, Elena, Sanz, José Antonio, Serrano, José Luis, Barberá, Joaquín, and Oriol, Luis
- Abstract
A divergent approach was used for the synthesis of dendritic structures based on a cyclotriphosphazene core with 12 or 24 hydroxyl groups, by starting from [N3P3(OC6H4OH-4)6] and using an acetal-protected 2,2-di(hydroxymethyl)propionic anhydride as the acylating agent. Hydroxyl groups in these first- and second-generation dendrimers, G1-(OH)12 or G2-(OH)24, were then condensed in turn with mono- or polycatenar pro-mesogenic acids to study their ability to promote self-assembly into liquid crystalline structures. Reactions were monitored by using 31P{1H} and 1H NMR spectroscopy and the chemical structure of the resulting materials was confirmed by using different spectroscopic techniques and mass spectrometry (MALDI-TOF MS). The results were in accordance with monodisperse, fully functionalised cyclotriphosphazene dendrimers. Thermal and liquid crystalline properties were studied by using optical microscopy, differential scanning calorimetry and X-ray diffraction. The dendrimer with 12 4-pentylbiphenyl mesogenic units gives rise to columnar rectangular organisation, whereas the one with 24 pentylbiphenyl units does not exhibit mesomorphic behaviour. In the case of materials that contain polycatenar pro-mesogenic units with two aromatic rings ( A4 vs. A5), the incorporation of a short flexible spacer connected to the periphery of the dendron (acid A5) was needed to achieve mesomorphic organisation. In this case, both dendrimer generations G1 A5 and G2 A5 exhibit a hexagonal columnar mesophase. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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18. On the Normalization of Interval Data.
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Santiago, Regivan, Bergamaschi, Flaulles, Bustince, Humberto, Dimuro, Graçaliz, Asmus, Tiago, and Sanz, José Antonio
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INTERVAL analysis , *DATA - Abstract
The impreciseness of numeric input data can be expressed by intervals. On the other hand, the normalization of numeric data is a usual process in many applications. How do we match the normalization with impreciseness on numeric data? A straightforward answer is that it is enough to apply a correct interval arithmetic, since the normalized exact value will be enclosed in the resulting "normalized" interval. This paper shows that this approach is not enough since the resulting "normalized" interval can be even wider than the input intervals. So, we propose a pair of axioms that must be satisfied by an interval arithmetic in order to be applied in the normalization of intervals. We show how some known interval arithmetics behave with respect to these axioms. The paper ends with a discussion about the current paradigm of interval computations. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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