On the computation of the transfer function matrix of singular systems

For singular systems, i.e. for systems of the form E[xdot] = Ax + Bu, with E singular, the problem of computing the transfer function matrix has been studied. An algorithm is developed which is similar to the corresponding algorithm proposed by Faddeev or Leverrier for regular systems. The present results involve the Drazin inverse and yield an expression for the transfer function matrix suitable for computer use.     

Temporal specificity in patterning of the rabbit nictitating membrane response

Rabbits were trained in either positive patterning (AX+, A−, X−) or negative patterning (A+, X+, AX−) using one of four intervals between the onset of A and the onset of X on AX trials. These intervals were 0, 800, 2,400, and 5,600 msec. In each task, all groups acquired an appropriate pattern of discriminative responding. Following acquisition, all rabbits were tested with the four different A-X intervals. All positive patterning groups showed an excitatory gradient, in which the highest level of responding occurred at the interval used in training. Conversely, all but one of the negative patterning groups showed an inhibitory gradient, in which the lowest level of responding occurred at the interval used in training. The one exception was the negative patterning group trained with simultaneous AX stimuli (0 msec), which showed a low, broad gradient, indicating transfer of inhibition across all the intervals. The results are discussed with respect to temporal encoding mechanisms and accounts of conditional discriminations.     

Critical disability studies and socially just change in higher education

Social justice is an ambiguous and contested term that is evoked in order to address issues of enhancing participation and eliminating discrimination across various markers of difference linked to race, social class, and so on. Historically, disability has been excluded from these analyses because it has been cast in the sphere of abnormality and individual pathology. Notwithstanding considerable progress in the widening participation of disabled individuals in higher education, there are still many issues that need to be addressed in order to remove barriers to inclusion and to eradicate discriminatory regimes. The article, by Anastasia Liasidou of the European University Cyprus, uses some insights from Critical Disability Studies in order to highlight the ways in which certain dimensions of a social justice discourse need to be incorporated into debates about widening participation in higher education on the grounds of disability. Considerable emphasis is placed on the importance of adopting the theoretical and pedagogical underpinnings of Universal Design for Learning (UDL) as a means to mobilising socially just changes in higher education.     

Bilingual and special educational needs in inclusive classrooms: some critical and pedagogical considerations

In the light of educational reforms aimed at promoting greater inclusive policies and practices, it is important to put a more pronounced emphasis on the needs of English language learners (ELLs) with special educational needs and/or disabilities. Simultaneously, a focus should also be placed on understanding and dealing with the disproportional representation of English language learners in special education categories. This dual and arguably sometimes mutually reinforcing phenomenon, along with its potential implications for education policy and practice, needs to be discussed against a convergent analytical framework drawn from bilingual and special education. The cross‐fertilisation of these disciplinary fields can provide a multimodal and comprehensive approach to meeting the intersectional needs of culturally and linguistically diverse students with special educational needs. To this end, it is important that issues of culture and language should become indispensable aspects of the special education knowledge base in inclusive classrooms.     

Definitions of bullying: a comparison of terms used,and age and gender differences,in a fourteen-country international comparison

The study of school bullying has recently assumed an international dimension, but is faced with difficulties in finding terms in different languages to correspond to the English word bullying. To investigate the meanings given to various terms, a set of 25 stick-figure cartoons was devised, covering a range of social situations between peers. These cartoons were shown to samples of 8- and 14-year-old pupils (N = 1,245; n = 604 at 8 years, n = 641 at 14 years) in schools in 14 different countries, who judged whether various native terms cognate to bullying, applied to them. Terms from 10 Indo-European languages and three Asian languages were sampled. Multidimensional scaling showed that 8-year-olds primarily discriminated nonaggressive and aggressive cartoon situations; however, 14-year-olds discriminated fighting from physical bullying, and also discriminated verbal bullying and social exclusion. Gender differences were less appreciable than age differences. Based on the 14-year-old data, profiles of 67 words were then constructed across the five major cartoon clusters. The main types of terms used fell into six groups: bullying (of all kinds), verbal plus physical bullying, solely verbal bullying, social exclusion, solely physical aggression, and mainly physical aggression. The findings are discussed in relation to developmental trends in how children understand bullying, the inferences that can be made from cross-national studies, and the design of such studies.     

Researching the Practice, Practicing the Research, and Promoting Responsible Policy: Usable Knowledge in Mind, Brain, and Education

ABSTRACT—The theme of Usable Knowledge in Mind, Brain, and Education will be a special section that will appear regularly in the journal. The section will focus on the synergistic connections between biology, cognitive science, and human development on the one hand and educational thought, policy, and practice on the other. Efforts to create usable knowledge in mind, brain, and education focus on questions that relate research and theory to educational practice, involving pedagogy and learning, discussions of how best to conduct ethical and valid research that crosses disciplinary boundaries, and consideration of how to use such research to promote responsible policy.     

A Quasi-Experimental Study of Maternal Smoking During Pregnancy and Offspring Academic Achievement

The current study, based on all births in Sweden from 1983 to 1991 ( N  =   654,707), explored the processes underlying the association between smoking during pregnancy (SDP) and offspring school grades and mathematic proficiency at age 15. The analyses compared relatives who varied in their exposure to SDP and who varied in their genetic relatedness. Although SDP was statistically associated with academic achievement (AA) when comparing unrelated individuals, the results suggest that SDP does not cause poorer academic performance, as full siblings differentially exposed to SDP did not differ in their academic scores. The pattern of results suggests that genetic factors shared by parents and their offspring help explain why offspring exposed to SDP have lower levels of AA.     

Luminal androgen receptor (LAR) subtype of triple-negative breast cancer: molecular,morphological, and clinical features

According to the classification presented by Lehmann BD (2016), triple-negative breast cancer (TNBC) is a heterogeneous group of malignant tumors with four specific subtypes: basal-like (subtype 1 and subtype 2), mesenchymal, and luminal androgen receptor (LAR) subtypes. The basal-like subtypes of carcinomas predominate in this group, accounting for up to 80% of all cases. Despite the significantly lower proportions of mesenchymal and LAR variants in the group of breast carcinomas with a TNBC profile, such tumors are characterized by aggressive biological behavior. To this end, the LAR subtype is of particular interest, since the literature on such tumors presents different and even contradictory data concerning the disease course and prognosis. This review is devoted to the analysis of the relevant literature, reflecting the main results of studies on the molecular properties and clinical features of the disease course of LAR-type TNBC carcinomas.     

Special educational needs: a public issue

This article explores the contribution of sociological scholarship to understanding and analysing the notions of ‘special educational needs’ and ‘disability’ and the ways in which the two notions have been reconfigured and theorised as ‘public issues’ rather than ‘personal troubles’. Barton's contribution is signified both in terms of his contribution to the evolution of the ‘sociological imagination’ – as a powerful theoretical tool for unravelling the highly political and contested nature of disability and special educational needs – and also in terms of his analysis of the emergence and development of sociological theorising in the field. The parochial obsession with deficit and medical‐oriented approaches to dealing with ‘difference’ and ‘need’ have been significantly challenged through the ‘sociological imagination’ aimed at pointing up the highly political and complex nature of disability and ‘special educational needs’. Times have changed and sociological theorising has evolved, but presumed ‘personal troubles’ are still not unequivocally conceptualised as being intertwined with, resting upon and emanating from ‘public issues’ embedded in the social, cultural and political edifice of educational, social and national communities. The ‘sociological imagination’ should be constantly invoked and deployed in order to expose and challenge the sophisticated ways in which individual pathology accounts and special educational imperatives re‐invent themselves through more inclusive linguistic veneers.