This paper presents an adaptive Power System Stabilizer (PSS) using an Adaptive Network Based Vague Inference System (ANVIS). An Adaptive Vague Set Based Controller Power System Stabilizer (AVCPSS) has been evaluated. This AVCPSS is capable of providing appropriate stabilization signals over a broad range of operating conditions and disturbances. A Vague Controller (VC) is synthesized by using ...

The aim of this paper is to further develop the congruence theory on lattice implication algebras. Firstly, we introduce the notions of vague similarity relations based on vague relations and vague congruence relations. Secondly, the equivalent characterizations of vague congruence relations are investigated. Thirdly, the relation between the set of vague filters and the set of vague congruence...

Proposing the similarity measures formula between Vague sets E and G. Concluding Vague resistance analysis. The concrete application steps were:1Establishing comprehensive characters set; 2Screening excellent varieties set; 3Extracting theory optimal varieties set; 4The single-value date transformed into Vague date, obtaining different varieties Vague sets; 5Vague resistance analysis 1,the simi...

the present study is an attempt to investigate the use of vague expressions by intermediate efl learners. more specifically, the current study focuses on the structures and functions of one of the most common categories of vague language, i.e. general extenders. the data include a 22-hour corpus of english-as-a-foreign-language conversations. a comparison is also made between this corpus and a ...

Is ‘vague’ vague? Aldrich (1937: 94) didn’t think so. Austin (1962: 126) did, and Sorensen (1985) offered a proof. Deas (1989) rejected the proof, but in (2003) I sided with Sorensen. Now Hull (2005) replies on behalf of Deas. Why so much fuss about a single word? One reason, I think, is that a lot depends on how we settle the question. For example, Frege (1903: §56) famously remarked that logi...

Topological predicates are an important element of database systems that allow manipulation of spatial data. Based on the necessity for such systems to handle uncertainty, we introduce a general mechanism that identifies vague topological predicates. This definition forms part of a formal data model referred to as VASA (Vague Spatial Algebra), in which the data types vague regions, vague lines,...

This paper investigates the implications for contracting problems with adverse selection of assuming a more general information structure than usual. The paper applies a choice theoretic framework introduced in Olszewski (2007) and Ahn (2008) a special case of the vague environments in Vierø (2009a) to a canonical principal-agent model with hidden information. The vague environment reflects tha...

Many geographical applications deal with objects in space that cannot be adequately described by determinate, crisp spatial concepts because of their intrinsically indeterminate and vague nature. Geographical information systems and spatial database systems are currently unable to cope with this kind of data. To support the efficient representation, querying, and manipulation of vague spatial d...

In this paper, the study of vague structures of Γ-semigroups is initiated by introducing the concepts of vague subsemigroup, vague bi-ideal and vague (1, 2)-ideal in a Γ-semigroup and some fundamental results are obtained. Then the concept of vague weakly completely prime ideals in Γ-semigroups has been introduced and studied directly and via operator semigroups

The notion of positive implicative vague ideals in BCKalgebras is introduced. A relation between a vague ideal and a positive implicative vague ideal is discussed. Characterizations of a positive implicative vague ideal are considered. 2010 AMS Classification: 06F35, 03G25, 03E72