The concept of distance rationalizability of social choice rules has been explored in recent years by several authors. We deal here with several foundational questions, and unify, correct, and generalize previous work. For example, we study a new question involving uniqueness of representation in the distance rationalizability framework, and present a counterexample. For rules satisfying variou...

This paper extends the recent literature on spatial price differences within a country to provide evidence on the Australian experience during the past two decades. While much of the existing evidence on spatial price variation within a country relates to large heterogeneous countries such as Brazil, India and Indonesia, Australia has not figured so far in this literature, because it is presume...

A NewsFusion System is a logic-based system for merging heterogeneous structured news reports. Structured news reports are XML documents, where the textentries are restricted to individual words or simple phrases, such as names and domain-specific terminology, and numbers and units. We assume structured news reports do not require natural language processing. In previous papers, we have present...

The new …eld of judgment aggregation aims to …nd collective judgments on logically interconnected propositions. Recent impossibility results establish limitations on the possibility to vote independently on the propositions. I show that, fortunately, the impossibility results do not apply to a wide class of realistic agendas once propositions like “if a then b” are adequately modelled, namely a...

Color is the most important properties for object discrimination. It is an object component that adds a new dimension to the machine vision. The color images on low devices are displayed having limited number of colors called as color palette reduction to cut down the storage requirements. In this paper we investigate the problem of averaging aggregation functions to select the appropriate func...

moving toward third millennium is characterized by capabilities in transforming human life. specially, development of information technologies in everyday life lead to great changes in communication tools andour current understanding ofurban social life. indeed, telecommunications because of independency from time—space constraints, provide a new unlimited space for social interactions in globa...

Database mining must capture the dynamics of data in the real-world. In other words, mining models would be able to maintain all changed rules when a database is updated. This paper presents a new model of aggregating association rules aimed at not only maintaining association rules in dynamical databases, but also aggregating association rules from di€erent data sources. Indeed, this aggregati...

This work presents a new computational approach, based on the formalism of P systems, for modelling and running simulations of animal population dynamics phenomena. Population and ecosystem dynamics models are de ned by the description of processes that involve several elements to be taken into account. Populations include individuals that belong to the same species, while one ecosystem include...

AIM It has been recently suggested that different 'unified theories of biodiversity and biogeography' can be characterized by three common 'minimal sufficient rules': (1) species abundance distributions follow a hollow curve, (2) species show intraspecific aggregation, and (3) species are independently placed with respect to other species. Here, we translate these qualitative rules into a quant...