759 research outputs found

    Verbruggen (J.F.). The Art of Warfare in western Europe during the Middle Ages, from the Eighth Century to 1340, trad, par S. Wlllard et R.W. Southern

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    Boffa Serge. Verbruggen (J.F.). The Art of Warfare in western Europe during the Middle Ages, from the Eighth Century to 1340, trad, par S. Wlllard et R.W. Southern. In: Revue belge de philologie et d'histoire, tome 78, fasc. 2, 2000. Histoire medievale. moderne: et contemporaine - Middeleeuwse, modhrnf en hedendaagse geschiedenis. pp. 658-659

    Sequences of Refinements of Rough Sets: Logical and Algebraic Aspects

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    In this thesis, a generalization of the classical Rough set theory [83] is developed considering the so-called sequences of orthopairs that we define in [20] as special sequences of rough sets. Mainly, our aim is to introduce some operations between sequences of orthopairs, and to discover how to generate them starting from the operations concerning standard rough sets (defined in [32]). Also, we prove several representation theorems representing the class of finite centered Kleene algebras with the interpolation property [31], and some classes of finite residuated lattices (more precisely, we consider Nelson algebras [87], Nelson lattices [23], IUML-algebras [73] and Kleene lattice with implication [27]) as sequences of orthopairs. Moreover, as an application, we show that a sequence of orthopairs can be used to represent an examiner’s opinion on a number of candidates applying for a job, and we show that opinions of two or more examiners can be combined using operations between sequences of orthopairs in order to get a final decision on each candidate. Finally, we provide the original modal logic SOn with semantics based on sequences of orthopairs, and we employ it to describe the knowledge of an agent that increases over time, as new information is provided. Modal logic SOn is characterized by the sequences (□ 1, ..., □ n) and (◯ 1, ..., ◯ n) of n modal operators corresponding to a sequence (t1, ..., tn) of consecutive times. Furthermore, the operator □ i of (□ 1, ..., □ n) represents the knowledge of an agent at time ti, and it coincides with the necessity modal operator of S5 logic [29]. On the other hand, the main innovative aspect of modal logic SOn is the presence of the sequence (◯ 1, ..., ◯ n), since ◯ i establishes whether an agent is interested in knowing a given fact at time ti

    How to merge opinions by using operations between sequences of orthopairs

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    Orthopairs are, analogously to rough sets, a mathematical tool for dealing with uncertainty. Sequences of orthopairs also take into account the possibility to deal with a refinement process of information and with missing information. After recalling the main definitions, we present different operations of conjunction between sequences of orthopairs. We further present an example in which, having available non complete information about applicants for a job, two examiners evaluate them in order to find the better candidates and then their opinions are merged into an individual result

    Strumenti economici nel diritto ambientale europeo

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    Il contributo sviluppa l'analisi dei principi economici alla base delle norme finalizzate a correggere le esternalità ambientali. Dopo avere analizzato gli strumenti tipici del diritto privato, fra i quali la tutela risarcitoria, vengono illustrati gli strumenti di diritto pubblico, soffermandosi su standard emissivi, tassazione ambientale e meccanismi di cap and trade. Si effettua infine un'analisi comparata fra i diversi strumenti, evidenziando vantaggi e limiti di ciascuno

    Discovery of interesting users in twitter by using rough sets

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    Twitter is today one of the most communication platforms and plays a key role as communications and news medium. This has driven most of companies to use Twitter for their advertisement campaign. So, it is crucial for them to have a strategy to individuate the advertisement targeting. In this article, we propose a Rough set-based methodology that analyzes the tweets posted by users during the weeks and interprets their needs and interests in order to disseminate the right advertisement to the right user in the right time
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