Trajectory-based real-time control of an electrical circuit against unknown faults

This paper presents a trajectory-based online control reconfiguration mechanism against unknown fault occurring in an electric circuit. First, we demonstrate the modeling of an electric circuit by taking the time-trajectory viewpoint, where no a priori input–output partition has been made. The uniqueness of this viewpoint lies in the fact that it deals only with variables that describe the system without any dedicated (external or internal -type) representation. Subsequently, we illustrate a novel real-time fault-tolerant control (FTC) strategy based on this trajectory standpoint, which does not require an explicit model-based fault diagnosis unit. Instead, the controller is reconfigured directly based on the trajectories generated by the system in real-time, and the given control specifications. In this way, we efficiently excrete the shortcomings that are often seen in model-based fault-tolerant systems. The proposed FTC method is effectively demonstrated on an RLC circuit.     

Sometimes less is more: educational effectiveness of English as a foreign language instruction in German classrooms

This article challenges one of the central orthodoxies of much school effectiveness and school improvement work – namely that schools should strive to become more consistent environments for pupils and teachers. It reviews the arguments for consistency; the success of centralised systems, and the 'mirroring' of factors of effectiveness at the different levels of organisation but also examines the evidence which seems inconsistent with this thesis. For example, the differential performance of boys and girls in some schools and of certain ethnic groups in some school environments. Whilst not suggesting that 'consistency' theories should be rejected in all circumstances the article argues that the motivation of students is the key factor which needs to link school organisation and school context. Drawing on organisational literature the analysis concludes that effective schools are most likely to be those which are able to differentiate their structures, strategies and policies for different groups of pupils and different learning tasks.     

What Ever Happened to the “Cool” Kids? Long‐Term Sequelae of Early Adolescent Pseudomature Behavior

Pseudomature behavior—ranging from minor delinquency to precocious romantic involvement—is widely viewed as a nearly normative feature of adolescence. When such behavior occurs early in adolescence, however, it was hypothesized to reflect a misguided overemphasis upon impressing peers and was considered likely to predict long‐term adjustment problems. In a multimethod, multireporter study following a community sample of 184 adolescents from ages 13 to 23, early adolescent pseudomature behavior was linked cross‐sectionally to a heightened desire for peer popularity and to short‐term success with peers. Longitudinal results, however, supported the study's central hypothesis: Early adolescent pseudomature behavior predicted long‐term difficulties in close relationships, as well as significant problems with alcohol and substance use, and elevated levels of criminal behavior.     

Social Disadvantage,Educational Attainment and Ethnicity: a comment

The relationships between educational attainment and social disadvantage for different ethnic groups, presented by Brewer & Haslum (1986), are reconsidered. Their assertion that indicators of social disadvantage are not associated with attainment for black children is shown to be based on a number of unsound statistical and methodological procedures. Data from a study of younger children in Inner London are presented which do show an association which is the same for both black and white children. But more data are needed for a more complete understanding of these associations.     

Effects of prior response-contingent reinforcement on superstitious behavior

Three pigeons were exposed to fixed-time (FT) 15 sec, fixed-interval (FI) 15 sec for performing an arbitrary response, a reversal back to FT 15 sec, and then extinction (no reinforcement). During each phase, a computer-controlled tracking system continuously recorded the position of the bird’s head as it moved freely in the experimental chamber. During the first exposure to FT 15 sec, all 3 birds developed a pattern of feeder-wall-directed behavior with occasional circular excursions from the feeder immediately following reinforcement. During FI 15 sec, all birds performed the arbitrary operant, which consisted of contacting a virtual target sphere near the rear of the chamber, and did not engage in feeder-wall-directed behavior. During the reversal back to FT 15 sec, the birds developed a behavior sequence consisting of moving in the direction of the target sphere after reinforcement, followed by feeder-wall-directed behavior prior to the next reinforcement. During extinction, either moves toward the target sphere or wall-directed behavior occurred separately, interspersed with reappearance of the two as a sequence, followed by cessation of both members of the behavior sequence. These findings indicate that prior reinforcement of an arbitrary response can affect the location and form of superstitious behavior that develops near the beginning of the interreinforcement interval, but that other factors (e.g., immediacy of reinforcement) affect the location and form of the behavior near the end of the interval. The findings can be interpreted in the context of superstitious chaining.     

Extensive reading as a means of input to L2 learning

A group of ESL learners (n = 16) in the UK were given a 3-month extensive reading programme involving graded readers to test the hypothesis that input of this nature could effect an improvement in their L2 competence. Comparison of pre-and post-treatment tests in reading and writing indicated that subjects had improved significantly in both skills, though particularly in writing. A subsequent more detailed analysis of one of the writing tests (an essay) showed post-treatment gains in number of words written and accuracy of expression. However, subjects' vocabulary base remained relatively unchanged and they used a generally more simple syntax. The experimental treatment thus appears to have encouraged a simpler but more correct form of expression in the L2. These results may relate to the linguistic models provided by the simplified language used in the graded readers. Extensive reading is suggested to have a potential in L2 development terms, teough the effect obtained from any given reading programme may be significantly related to the linguistic form of the material used.     

Concept maps as a heuristic for science curriculum development: Toward improvement in process and product

This article outlines the use of concept maps as a tool for science curriculum development and discusses the changes that occur in the teacher's view of the curriculum with successive revisions of the maps. Although we have used concept mapping in curriculum development with teachers from grades 4–8, we describe in detail the maps created by sixth-grade teachers. We analyzed the maps using three criteria: hierarchical structure, progressive differentiation, and integrative reconciliation. Changes made to the maps during the revision process, including additions and deletions, show increased clarification of both the concepts to be learned and the connections between them. Consecutive map revisions show the development of a cohesive conceptual grade-six science curriculum. The use of concept maps can help science teachers develop science curriculum that is hierarchically arranged, integrated, and conceptually driven.     

Schools,teachers and community: cultivating the conditions for engaged student learning

This paper reveals the nature of the actions, discussions and relationships which characterised teachers’ and associated school personnel’s efforts to engage poor and refugee students through a community garden located in a school in a low socio-economic urban area in south-east Queensland, Australia. These actions, discussions and relationships are described as both revealing and producing particular ‘practice architectures’ which help constitute conditions for practice—in this case, conditions for beneficial student learning. The paper draws upon interview data with teachers, other school staff and community members working in the school to reveal the interrelating actions, discussions and relationships involved in developing and using the garden for academic and non-academic purposes. By better understanding such interrelationships as practice architectures, the paper reveals how teachers and those in schooling settings learn to facilitate student learning practices that likely to assist some of the most marginalised students in schooling settings.     

Teachers’ professional development in special needs settings: creating ‘kid-cool’ schools in challenging times

This paper explores the nature of teachers’ professional development (PD) practices in special needs/special education settings in Australia under current neoliberal and managerial conditions. The research is based on individual interviews with teachers from a juvenile justice centre and a dedicated special needs school in a regional city in the state of New South Wales. Bourdieu’s conception of social practice as contested is applied to make sense of teachers’ understanding of the conflicted nature of PD practices in these schooling settings. The findings reveal teacher PD in these special needs settings is influenced by the increased commodification of education, broader accountability pressures which seek to individualise teachers’ PD experiences, and increased attention to a narrower range of educational outcomes, particularly students’ test scores. However, at the same time, these settings also enable more localised, collaborative inquiry focused upon specific students’ needs, and PD relevant to a multi-faceted conception of students’ learning. In this way, teacher PD contributes to a focus upon student learning in all its complexity, even as it is simultaneously confined by neoliberal and managerial pressures.