Jarik Nešetřil suggested to the first author the investigation of notions of homogeneity for relational structures, where “isomorphism” is replaced by “homomorphism” in the definition. Here we look in detail at what happens for posets. For the strict order, all five generalisations of homogeneity coincide, and we give a characterisation of the countable structures that arise. For the non-strict...

Many medical studies are carried out to investigate the size of some effect, for example the treatment effect in a controlled clinical trial or the risk of exposure to some substance in an observational study. To this end it is usual to compare groups of subjects, such as those receiving active treatment with those getting placebo or those exposed with those not exposed. The comparison is often...

Police presumptions about criminal career trajectories have been little studied. The exploratory study reported here involved 42 police staff of varying rank and experience. Participants were asked to complete a questionnaire which asked them to predict the type of offence that an individual was most likely to commit next from a given range of different offending scenarios. The findings suggest...

V. Parpura and P.G. Haydon (eds.), Astrocytes in (Patho)Physiology of the Nervous System, 1 DOI: 10.1007/978-0-387-79492-1_1, © Springer Science + Business Media, LLC 2009 The history of the morphology and electrophysiology of the neuroglia , which was the historical term used for what are now termed astroglia or astrocytes, is briefly reviewed. The interpretation of these data around 1970 was ...

The statistical NLP and IR literatures tend to make a “homogeneity assumption” about the distribution of terms, either by adopting a “bag of words” model, or in their treatment of function words. In this paper we develop a notion of homogeneity detection to a level of statistical significance, and conduct a series of experiments on different datasets, to show that the homogeneity assumption doe...

The presence of long-range correlations and/or mosaicism in DNA sequences results in GC fluctuations, even within individual isochores that are much larger than expected correlation-free ‘random’ sequences. Neglecting the presence of such fluctuations can lead to incorrect conclusions regarding relative homogeneity or isochore borders. In this commentary, we address these and other methodologic...

This paper considers the finite-time consensus problem for a multi-agent system with second-order individual dynamics. Local (non-smooth) time-invariant consensus protocols in different forms are constructed for each double-integrator agent dynamics in a quite unified way with help of Lyapunov function, graph theory, and homogeneity with dilation. Finite-time consensus can be obtained theoretic...

The aim of this note is to propose a definition of the scientific diversity and corollarly, a measure of the “interdisciplinarity” of collaborations. With respect to previous studies, the proposed approach consists of 2 steps : first, the definition of similarity between journals and second, these similarities are used to characterize the homogeneity (or, on the contrary the diversity) of a pub...

We report the development of the Assessment of Individual Motives-Questionnaire (AIM-Q), a new instrument based on an evolutionary psychology theory of human motivation. It provides multitrait-multimethod (MTMM) assessment of individual differences on 15 motive scales. A total heterogeneous sample of N = 1,251 participated in eight studies that evaluated the homogeneity, internal consistency, t...