959 resultados para Ragin, Charles C.: Fuzzy-set social science
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Background Social communication deficits are prevalent amongst children with anxiety disorders; however whether they are over-represented specifically among children with Social Anxiety Disorder has not been examined. This study set out to examine social communication deficits among children with Social Anxiety Disorder in comparison to children with other forms of anxiety disorder. Methods Parents of 404 children with a diagnosed anxiety disorder completed the Social Communication Questionnaire (SCQ; Rutter, M., Bailey, A., Lord, C., 2003. The Social Communication Questionnaire – Manual. Western Psychological Services, Los Angeles, CA). Children with a diagnosis of Social Anxiety Disorder (n=262) and anxious children without Social Anxiety Disorder (n=142) were compared on SCQ total and subscale scores and the frequency of participants scoring above clinical cut-offs. Results Children with Social Anxiety Disorder scored significantly higher than anxious children without Social Anxiety Disorder on the SCQ total (t(352)=4.85, p<.001, d=.55, r=.27), Reciprocal Social Interaction (t(351)=4.73, p<.001, d=.55, r=.27), communication (t(344)=3.62, p<.001, d=.43, r=.21) and repetitive, restrictive and stereotyped behaviors subscales (t(353)=3.15, p=.002, d=.37, r=.18). Furthermore, children with Social Anxiety Disorder were three times more likely to score above clinical cut-offs. Limitations The participants were a relatively affluent group of predominantly non-minority status. The social communication difficulties measure relied on parental report which could be influenced by extraneous factors. Conclusions Treatments for Social Anxiety Disorder may benefit from a specific focus on developing social communication skills. Future research using objective assessments of underlying social communication skills is required.
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This is the second half of a two-part paper dealing with the social theoretic assumptions underlying system dynamics. In the first half it was concluded that analysing system dynamics using traditional, paradigm-based social theories is highly problematic. An innovative and potentially fruitful resolution is now proposed to these problems. In the first section it is argued that in order to find an appropriate social theoretic home for system dynamics it is necessary to look to a key exchange in contemporary social science: the agency/structure debate. This debate aims to move beyond both the theories based only on the actions of individual human agents, and those theories that emphasise only structural influences. Emerging from this debate are various theories that instead aim to unite the human agent view of the social realm with views that concentrate solely on system structure. It is argued that system dynamics is best viewed as being implicitly grounded in such theories. The main conclusion is therefore that system dynamics can contribute to an important part of social thinking by providing a formal approach for explicating social mechanisms. This conclusion is of general significance for system dynamics. However, the over-arching aim of the two-part paper is to increase the understanding of system dynamics in related disciplines. Four suggestions are therefore offered for how the system dynamics method might be extended further into the social sciences. It is argued that, presented in the right way, the formal yet contingent feedback causality thinking of system dynamics should diffuse widely in the social sciences and make a distinctive and important contribution to them. Felix qui potuit rerum cognoscere causas Happy is he who comes to know the causes of things Virgil - Georgics, Book II, line 490. 29 BCE
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This paper explores the social theories implicit in system dynamics (SD) practice. Groupings of SD practice are observed in different parts of a framework for studying social theories. Most are seen to be located within `functionalist sociology'. To account for the remainder, two new forms of practice are discussed, each related to a different paradigm. Three competing conclusions are then offered: 1. The implicit assumption that SD is grounded in functionalist sociology is correct and should be made explicit. 2. Forrester's ideas operate at the level of method not social theory so SD, though not wedded to a particular social theoretic paradigm, can be re-crafted for use within different paradigms. 3. SD is consistent with social theories which dissolve the individual/society divide by taking a dialectical, or feedback, stance. It can therefore bring a formal modelling approach to the `agency/structure' debate within social theory and so bring SD into the heart of social science. The last conclusion is strongly recommended.
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There is a family of well-known external clustering validity indexes to measure the degree of compatibility or similarity between two hard partitions of a given data set, including partitions with different numbers of categories. A unified, fully equivalent set-theoretic formulation for an important class of such indexes was derived and extended to the fuzzy domain in a previous work by the author [Campello, R.J.G.B., 2007. A fuzzy extension of the Rand index and other related indexes for clustering and classification assessment. Pattern Recognition Lett., 28, 833-841]. However, the proposed fuzzy set-theoretic formulation is not valid as a general approach for comparing two fuzzy partitions of data. Instead, it is an approach for comparing a fuzzy partition against a hard referential partition of the data into mutually disjoint categories. In this paper, generalized external indexes for comparing two data partitions with overlapping categories are introduced. These indexes can be used as general measures for comparing two partitions of the same data set into overlapping categories. An important issue that is seldom touched in the literature is also addressed in the paper, namely, how to compare two partitions of different subsamples of data. A number of pedagogical examples and three simulation experiments are presented and analyzed in details. A review of recent related work compiled from the literature is also provided. (c) 2010 Elsevier B.V. All rights reserved.
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Estimating the sizes of hard-to-count populations is a challenging and important problem that occurs frequently in social science, public health, and public policy. This problem is particularly pressing in HIV/AIDS research because estimates of the sizes of the most at-risk populations-illicit drug users, men who have sex with men, and sex workers-are needed for designing, evaluating, and funding programs to curb the spread of the disease. A promising new approach in this area is the network scale-up method, which uses information about the personal networks of respondents to make population size estimates. However, if the target population has low social visibility, as is likely to be the case in HIV/AIDS research, scale-up estimates will be too low. In this paper we develop a game-like activity that we call the game of contacts in order to estimate the social visibility of groups, and report results from a study of heavy drug users in Curitiba, Brazil (n = 294). The game produced estimates of social visibility that were consistent with qualitative expectations but of surprising magnitude. Further, a number of checks suggest that the data are high-quality. While motivated by the specific problem of population size estimation, our method could be used by researchers more broadly and adds to long-standing efforts to combine the richness of social network analysis with the power and scale of sample surveys. (C) 2010 Elsevier B.V. All rights reserved.
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This work presents a methodology to analyze transient stability for electric energy systems using artificial neural networks based on fuzzy ARTMAP architecture. This architecture seeks exploring similarity with computational concepts on fuzzy set theory and ART (Adaptive Resonance Theory) neural network. The ART architectures show plasticity and stability characteristics, which are essential qualities to provide the training and to execute the analysis. Therefore, it is used a very fast training, when compared to the conventional backpropagation algorithm formulation. Consequently, the analysis becomes more competitive, compared to the principal methods found in the specialized literature. Results considering a system composed of 45 buses, 72 transmission lines and 10 synchronous machines are presented. © 2003 IEEE.
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The prediction of the traffic behavior could help to make decision about the routing process, as well as enables gains on effectiveness and productivity on the physical distribution. This need motivated the search for technological improvements in the Routing performance in metropolitan areas. The purpose of this paper is to present computational evidences that Artificial Neural Network ANN could be use to predict the traffic behavior in a metropolitan area such So Paulo (around 16 million inhabitants). The proposed methodology involves the application of Rough-Fuzzy Sets to define inference morphology for insertion of the behavior of Dynamic Routing into a structured rule basis, without human expert aid. The dynamics of the traffic parameters are described through membership functions. Rough Sets Theory identifies the attributes that are important, and suggest Fuzzy relations to be inserted on a Rough Neuro Fuzzy Network (RNFN) type Multilayer Perceptron (MLP) and type Radial Basis Function (RBF), in order to get an optimal surface response. To measure the performance of the proposed RNFN, the responses of the unreduced rule basis are compared with the reduced rule one. The results show that by making use of the Feature Reduction through RNFN, it is possible to reduce the need for human expert in the construction of the Fuzzy inference mechanism in such flow process like traffic breakdown. © 2011 IEEE.
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Pós-graduação em Ciências Ambientais - Sorocaba
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With the increasing production of information from e-government initiatives, there is also the need to transform a large volume of unstructured data into useful information for society. All this information should be easily accessible and made available in a meaningful and effective way in order to achieve semantic interoperability in electronic government services, which is a challenge to be pursued by governments round the world. Our aim is to discuss the context of e-Government Big Data and to present a framework to promote semantic interoperability through automatic generation of ontologies from unstructured information found in the Internet. We propose the use of fuzzy mechanisms to deal with natural language terms and present some related works found in this area. The results achieved in this study are based on the architectural definition and major components and requirements in order to compose the proposed framework. With this, it is possible to take advantage of the large volume of information generated from e-Government initiatives and use it to benefit society.
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Dieser Artikel bietet einen Überblick über die Entwicklung und Zusammenhänge der einzelnen Elemente der Fuzzy-Logik, wovon Fuzzy-Set-Theorie die Grundlage bildet. Die Grundproblematik besteht in der Handhabung von linguistischen Informationen, die häufig durch Ungenauigkeit gekennzeichnet sind. Die verschiedenen technischen Anwendungen von Fuzzy-Logik bieten eine Möglichkeit, intelligentere Computersysteme zu konstruieren, die mit unpräzisen Informationen umgehen können. Solche Systeme sind Indizien für die Entstehung einer neuen Ära des Cognitive-Computing, di in diesemArtikel ebenfalls zur Sprache kommt. Für das bessere Verständnis wird der Artikel mit einem Beispiel aus der Meteorologie (d. h. Schnee in Adelboden) begleitet.
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"The Social Function of Philosophy" (GS 4, S. 332-351), veröffentlicht in: Studies in Philosophy and Social Science VIII, 1939, S.322-337, a) englischer Vortragstext, Typoskript 16 Blatt, b) dass., Typoskript, 28 Blatt, c) dass., Typoskript mit handschriftlichen Korrekturen, 42 Blatt, d) deutsche Fassung des Vortragstextes, Typoskript mit eigenhändigen Korrekturen, 26 Blatt, e) dass., Typoskript mit handschriftlichen Korrekturen, 26 Blatt, f) deutsche Übersetzung von Kurt Jürgen Huch und Alfred Schmidt des in der Zeitschrift für Sozialforschung veröffentlichten Textes mit dem Titel: "Die gesellschaftliche Funktion der Philosophie", veröffentlicht in Max Horkheimer, "Kritische Theorie", Bd. II, 1968, S. 292-312, Typoskript mit handschriftlichen Korrekturen, 33 Blatt;
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Über das Forschungsprogramm: The Philosophy of Western Society. Teilstück des allgemeinen Forschungsprogramms, veröffentlicht unter dem Untertitel: "The Philosophy of Social Science", in: "International Institute of Social Research. A Report of Its History, Aims and Activites, 1933-1938", New York (1938?), S. 19, Typoskript mit eigenhändiger Korrektur, 2 Blatt; Bericht über die Aktivitäten des Instituts für Sozialforschung für Robert M. MacIver, 1938-39: 1. Bericht vom 7.12.1939; a) Typoskript, englisch, 9 Blatt; b) Typoskript, als Brief von Pollock an Robert M. MacIver, Typoskript 10 Blatt; c) Entwurf Typoskript, englisch, 15 Blatt; d) Entwurf Typoskript, deutsch, 17 Blatt; MacIver, Robert M.: 1 Brief mit Unterschrift an Friedrich Pollock, New York, 27.04.1938, 1 Blatt; "Some data on the Institut`s Staff and Activities", 11.03.1938, zwei Typoskripte, je 2 Blatt; Über die Tätigkeiten des Instituts für Sozialforschung. Verschiedene Berichte. 1939; Aufstellung der Forschungsgebiete verschiedener Mitarbeiter des Instituts. Ohne Datum, Typoskript, 9 Blatt; Aufstellung der Forschungsgebiete verschiedener Mitarbeiter des Institutes, aus einem Bericht. Typoskript, 7 Blatt; Bericht an den Präsidenten des Columbia University. Typoskript, 2 Blatt; "Contribution of Dr. Franz Neumann to the Round Table Discussion, Chicago, Social Science Reaserach Building" Dezember 1939; a) Typoskript mit Handschriftlichen Korrekturen, 3 Blatt; b) Typoskript, 3 Blatt; "Statment on the objectives of the International Institut of Social Research". Typoskript, 2 Blatt; Stipendiaten des Instituts für Sozialforschung: Forschungsberichte, Ende 1939; Adorno, Theodor W.: a) Typoskript, englisch, mit eigenhändigen Korrekturen, 4 Blatt; b) Typoskript, deutsch, 3 Blatt; Beck, Maximilian: "Geschichte des Begriffs der Vernunft von Platon bis Husserl (Outline)". Typoskript, englisch und deutsch, mit handschriftlichen Korrekturen, 7 Blatt; Flechtheim, Ossip K.: Typoskript mit handschriftlichen Ergänzungen, 1 Blatt; Fried, Hans Ernest: Typoskript, 1 Blatt, 16.11.1939; Grossmann, Henryk: "Capitalism in the 13th Century"; a) Typoskript, englisch, mit handschriftlichen Korrekturen, 6 Blatt; b) Typoskript, englisch, 6 Blatt; c) Typoskript, deutsch, 4 Blatt; Grossmann, Henryk: "The Classical Theory and Marxism"; a) Typoskript, englisch, mit handschriftlichen Korrekturen, 2 Blatt; b) Typoskript, deutsch, mit handschriftlichen Korrekturen, 2 Blatt; Kirchheimer, Otto: Manuskript, 1 Blatt; Lauterbach, Albert: a) Typoskript, englisch, mit handschriftlichen Korrekturen, 2 Blatt; b) Typoskript, deutsch, mit handschriftlichen Korrekturen, 1 Blatt; Marcuse, Herbert: Typoskript mit handschriftlichen Korrekturen, 2 Blatt; Neumann, Franz L.: Typoskript, 2 Blatt; Wittfogel, Karl August: Typsokript, 2 Blatt; Zilsel, Edgar: Typoskript, 4 Blatt; Research Projects of the International Institute of Social Research. nicht vor 1939; Beschreibung der Forschungsprojekte: Pollock, Friedrich: "Economic and Social Cosequences of a Prepardness Economy". Neumann, Franz L.: "The Rule of Law". Fromm, Erich: "The German Worker in the Weiman Republic". Kirchheimer,Otto: "Criminal Law and Social Structure". Marcuse, Herbert: " A Text and Source Book for the History of Philosophy". Fromm, Erich: "Character Structure of Modern Man". Neumann, Franz L.: "The Theory and Practice of European Labor Law". Wittfogel, Karl August; Wittfogel-Lang, Olga: "The Chinese Family"; Dasselbe wie in "Beschreibung der Forschungsprojekte", ausgenommen Pollock, Friedrich: "Economic and Social Cosquences of a Prepardness Economy" und Fromm, Erich: "The German Worker in the Weimar Republic", zusätzlich Kirchner, Otto; Weil, Felix: "Changes in Social Stratification, National Income, and Living Standards of Germany since 1933"; 1 Ordner, Typoskript mit eigenhändigen Korrekturen, 49 Blatt;
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In this paper, we axiomatically introduce fuzzy multi-measures on bounded lattices. In particular, we make a distinction between four different types of fuzzy set multi-measures on a universe X, considering both the usual or inverse real number ordering of this lattice and increasing or decreasing monotonicity with respect to the number of arguments. We provide results from which we can derive families of measures that hold for the applicable conditions in each case.