470,751 research outputs found
Similarity-Based Logics for Approximate Entailments. Quantitative Logic and Soft Computing
No full textReasoning under practical circumstances is often inexact. Assumptions
might be fulfilled only in an approximate way but conclusions are drawn anyway.
Different epistemic aspects may be involved, like uncertainty, preference or similarity. In order to formalise such kind of reasoning we need to go beyond classical
propositional logic. In this presentation we will deal with logics for similarity-based
reasoning. This kind of reasoning can be cast in the more general framework of reasoning by analogy and has applications, for example, in classification, case-based
reasoning, or interpolation.The author acknowledges partial support by the Spanish MINECO/FEDER
project RASO (TIN2015-71799-C2-1-P)Peer reviewe
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Japan: Shadow WTO Agricultural Domestic Support Notifications
No full text"The purpose of this paper is to provide a comprehensive review of Japan's agricultural domestic policy since 1995 in the context of the current international negotiations in the WTO Doha Round, which has as one aim further reductions of trade-distorting support among member countries. An overwhelming majority of farmers in Japan own small plots of rice paddy fields and earn their living mainly on their off-farm income. They go out into rice paddy fields in their spare time as a subsidiary business. Traditional small farming communities are powerful voting groups that seek to maintain their political power. By exerting political pressures on the authorities, farmers can obtain large returns through the manipulation of farmland use regulations, even though such manipulation causes social harm by preventing efficient land use. These inefficiencies in land use are a major reason why Japan is the only country whose food self-sufficiency rate keeps declining in spite of its heavy agricultural protection. In this sense, Japan is in sharp contrast to European and North American countries, where heavy agricultural domestic supports have resulted in an increased output of agricultural commodities and subsequent distortions in international markets. Apparently, Japan's attitude towards agricultural domestic policy reform is one of compliance with the WTO, which requests member countries to reduce their Aggregate Measure of Support (AMS) through trimming trade-distorting (amber box) support and/or transforming traditional-type agricultural subsidies to decoupled-type ones. Japan reduced its amber box support by nearly 80 percent between 1995 and 2000. This drastic reduction is mainly attributable to Japan's removal of rice from the amber box in 1998. In addition, following the WTO's principle of decoupling, Japan launched an extensive agricultural subsidy reform in 2007. This paper, however, shows the ironical realities of Japanese agricultural policy. Neither a sharp reduction of amber box support nor Japan's 2007 reform necessarily mean there will be a reduction of trade-distorting effects. On the contrary, the 2007 reform may in fact stimulate domestic rice production. In 2007, Japan's AMS is as little as 18 percent of its commitment level from the Uruguay Round WTO agreements. In addition, this paper projects that Japan's overall trade-distorting support (OTDS) for 2013 will be 469 billion yen, which is much less than the limit of 1,635 billion yen that is proposed in the modalities under discussion in July 2008 for the WTO Doha Round. Thus, the WTO Doha Round negotiations on domestic support policy are unlikely to restrict Japan's domestic agricultural support policy." from authors' abstractJapan's agricultural support, WTO Doha Round, WTO compliance, Notification of domestic support, trade,
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Real, rational and finite semantics for fuzzy logics
No full textIn the seminal paper of Zadeh about Fuzzy Logic, he defined fuzzy sets over the real unit interval but in real systems applications fuzzy sets over rational numbers in [0, 1] or over finite sets of values of a linguistic variable were also used. In this paper we try to analyze the differences between these different possible sets of truth-values in the setting of residuated multiple-valued logics underlying fuzzy sets. Moreover this analysis also clarifies the differences between t-norms in the strict sense (over [0, 1]) and t-norm like over other linearly ordered sets, namely the rationa linterval and finite chains
LP and LP1\2: two fuzzy logics joining Lukasiewicz and Product logics
No full textIn this paper we provide a finite axiomatization (using two finitary rules only) for the propositional logic (called LΠ) resulting from the combination of Lukasiewicz and Product Logics, together with the logic obtained by from LΠ by the adding of a constant symbol and of a defining axiom for 1/2, called LΠ1/2. We show that LΠ1/2 contains all the most important propositional fuzzy logics: Lukasiewicz Logic, Product Logic, Gödel's Fuzzy Logic, Takeuti and Titani's Propositional Logic, Pavelka's Rational Logic, Pavelka's Rational Product Logic, the Lukasiewicz Logic with Δ, and the Product and Gödel's Logics with Δ and involution. Standard completeness results are proved by means of investigating the algebras corresponding to LΠ and LΠ1/2. For these algebras, we prove a theorem of subdirect representation and we show that linearly ordered algebras can be represented as algebras on the unit interval of either a linearly ordered field, or of the ordered ring of integers, Z
Generalized continuous and left-continuous t-norms arising from algebraic semantics for fuzzy logics
No full textThis paper focuses on the issue of how generalizations of continuous and left-continuous t-norms over linearly ordered sets should be from a logical point of view. Taking into account recent results in the scope of algebraic semantics for fuzzy logics over chains with a monoidal residuated operation, we advocate linearly ordered BL-algebras and MTL-algebras as adequate generalizations of continuous and left-continuous t-norms respectively. In both cases, the underlying basic structure is that of linearly ordered residuated lattices. Although the residuation property is equivalent to left-continuity in t-norms, continuous t-norms have received much more attention due to their simpler structure. We review their complete description in terms of ordinal sums and discuss the problem of describing the structure of their generalization to BL-chains. In particular we show the good behavior of BL-algebras over a finite or complete chain, and discuss the partial knowledge of rational BL-chains. Then we move to the general non-continuous case corresponding to left-continuous t-norms and MTL-chains. The unsolved problem of describing the structure of left-continuous t-norms is presented together with a fistful of construction-decomposition techniques that apply to some distinguished families of t-norms and, finally, we discuss the situation in the general study of MTL-chains as a natural generalization of left-continuous t-norms. © 2009 Elsevier Inc. All rights reserved
Financial Liberalization and Japan's Agricultural Cooperatives
No full textThe system of agricultural cooperatives, called JA, is one of the most politically powerful organizations in Japan, and it has continuously called for agricultural protection. In spite of its importance, information on JA's banking and insurance businesses has been limited for foreign researchers because of the uniqueness and complexity of the JA system. This paper provides a clear understanding of JA's activities and explains the political dynamics in Japan's agricultural sector. Up until the early 1990s, JA could count on stable profits from its banking and insurance businesses because of the government's favorable treatment of JA. Using these profits, JA had been successfully forming farmers into a solid voting group until the mid-1990s. However, the government gradually abandoned its favorable treatment of JA in order to introduce more competition in financial markets. As a result, profitability of J's banking and insurance businesses became unstable in the mid-1990s. The mid-1990s can be regarded as the turning point of the political dynamics of Japan's agricultural sector. As JA lost stable profits, its organizing ability and political power also weakened. The political pressure for agricultural protection also decreased. Because of this decrease in political pressure, there is now a prime opportunity for the Japanese government to reform its agricultural policies. It is not agricultural market and/or trade liberalization that is providing this opportunity. Instead, financial liberalization is providing this opportunity.Agribusiness, Financial Economics, E5, Q13, Q18,
Combinaciones lexicográficas de relaciones de preferencia en el contexto de la Teoría de la Decisión Posibilista
No full textIn Possibilistic Decision Theory (PDT), decisions are ranked by a pressimistic or by an optimistic qualitative criteria. The preference relations induced by these criteria have been axiomatized by corresponding sets of rationality postulates, both à la von Neumann and Morgenstern and à la Savage. In this paper we first address a particular issue regarding the axiomatic systems of PDT à la von Neumann and Morgenstern. Namely, we show how to adapt the axiomatic systems for the pessimistic and optimistic criteria when some finiteness assumptions in the original model are dropped. Second, we show that a recent axiomatic approach by Giang and Shenoy using binary utilities can be captured by preference relations defined as lexicographic refinements of the above two criteria. We also provide an axiomatic characterization of these lexicographic refinements.Lluis Godo acknowledges partial support of
the Spanish project MULOG, TIN2004-07933-C03-01.Peer reviewe
- …
