Fault reconstruction using a LPV sliding mode observer for a class of LPV systems

This paper proposes a new sliding mode observer for fault reconstruction, applicable for a class of linear parameter varying (LPV) systems. Observer schemes for actuator and sensor fault reconstruction are presented. For the actuator fault reconstruction scheme, a virtual system comprising the system matrix and a fixed input distribution matrix is used for the design of the observer. The fixed input distribution matrix is instrumental in simplifying the synthesis procedure to create the observer gains to ensure a stable closed-loop reduced order sliding motion. The ‘output error injection signals’ from the observer are used as the basis for reconstructing the fault signals. For the sensor fault observer design, augmenting the LPV system with a filtered version of the faulty measurements allows the sensor fault reconstruction problem to be posed as an actuator fault reconstruction scenario. Simulation tests based on a high-fidelity nonlinear model of a transport aircraft have been used to demonstrate the proposed actuator and sensor FDI schemes. The simulation results show their efficacy.     

Introduction−justifying a cross-cultural comparative approach to school leadership and management

England's Education Action Zones are a flagship New Labour policy geared towards raising standards and reducing social exclusion in areas of educational under-performance. This introduction outlines key features of the policy, considers its broader significance in relation to new models of educational governance and pulls out some of the key issues that arise from the contributions to this special feature.     

The other exit: The definitive statement on management theory and practice in our time

As part of an investigation into the progress of the appraisal of primary school headteachers in three LEAs in the Midlands, the three LEA appraisal coordinators concerned were interviewed in advance of a sample of the headteachers. From the three semi-structured interviews it was possible to detect interesting differences, as well as similarities, in the procedures adopted in the LEAs. In one case the advisers were unable to meet the statutory obligation for there to be an LEA officer involved in each appraisal and reporting back to the LEA appeared to be very patchy. This stemmed from resource constraints which were also seen as a looming problem by the other coordinators. In all three cases the coordinators had tried to ensure that the implementation of headteacher appraisal was as non-threatening as possible. This had led in some cases to a level of reciprocity of appraisal together with a degree of choice which might be seen as a more comfortable set of arrangements than many managers outside education or, for that matter, class teachers might encounter. The outcomes were, however, seen as very positive staff development for the heads concerned. (This is being confirmed by the overwhelming majority of the heads themselves in the interviews with them which have taken place subsequently.) Although appraisal reports on heads are available by law to the chairpersons of governing bodies, there was evidence that such feedback as there was tended to be perfunctory in many cases. There is evidence that this is not through carelessness. Appraisal of headteachers may not be following the lines of accountability originally favoured by the government. This may account for some evidence of government disenchantment with the appraisal process in education as it currently operates.     

The reliability and validity of the pupil behaviour questionnaire: a child classroom behaviour assessment tool

ABSTRACT

This paper assesses the reliability and validity of the teacher-completed Pupil Behaviour Questionnaire (PBQ), by comparing it to the already extensively validated teacher-completed Strengths and Difficulties Questionnaire (SDQ). Participants included 2074 primary school children participating in a universal school-based trial and 41 vulnerable children who were taking part in a study exploring the impact of exclusion from school. Exploratory factor analysis results (first factor accounts for 80.8% of the variation in the items) and the high Cronbach’s alpha value of 0.85 indicate that the PBQ consists of one substantive factor/dimension. Strong correlations between the total PBQ score and the conduct sub-scale (Spearman’s correlation coefficient (r_s) = 0.67) and total difficulties score (r_s = 0.59) of the SDQ indicate convergent validity. This study suggests that the PBQ is a reliable measure, and provides some evidence of validity. Further work is needed to test the PBQ in an older, more diverse populations and to measure sensitivity to change.     

“May god have mercy on your soul!” Exploring and teaching a course on the death penalty

Teaching a course with emotive content presents faculty with a number of challenges. This article reflects on the lessons learned when teaching a semester-long course on the death penalty at a liberal arts university in the U.S. South. The course explored cultural, religious, historical, national, and international perspectives on the nature of punishment and the right to execute, the methods used in the death penalty, the efficacy of the death penalty, and future directions. The organization, presentation and teaching aids employed throughout this course sought to ensure an objective stance and focused on improving critical thinking among students.     

The Instructional and Emotional Quality of Parent–Child Book Reading and Early Head Start Children's Learning Outcomes

Research Findings: The objective of this study was to understand how two dimensions of parent–child book-reading quality—instructional and emotional—interact and relate to learning in a sample of low-income infants and toddlers. Participants included 81 parents and their children from Early Head Start programs in the rural Midwest. Correlation and multiple regression analyses were used to test the hypothesis that parental book-reading qualities interact and relate to children's concurrent cognitive and language scores. Exploratory analyses examined if patterns of relationships varied for families who had different home languages (i.e., English, Spanish). Results included that book-reading qualities and home language interacted to predict child scores. Practice or Policy: Findings suggest a need to further explore potentially complex patterns of relationships among parental book-reading behaviors and child learning for diverse families. Understanding these patterns could inform the development of culturally-sensitive intervention approaches designed to support high-quality shared book reading.     

A Guide to Analyzing Message–Response Sequences and Group Interaction Patterns in Computer‐mediated Communication

This paper proposes a set of methods and a framework for evaluating, modeling, and predicting group interactions in computer‐mediated communication. The method of sequential analysis is described along with specific software tools and techniques to facilitate the analysis of message–response sequences. In addition, the Dialogic Theory and its assumptions are presented to establish a theoretical framework and guide to using sequential analysis in computer‐mediated communication research. Step‐by‐step instructions are presented to illustrate how sequential analysis can be used to measure the way latent variables (e.g., message function, response latency, communication style) and exogenous variables (e.g., gender, discourse rules, context) affect how likely a message is to elicit a response, the types of responses elicited by the message, and whether or not the elicited sequence of responses (e.g., claim → challenge → explain) mirror the processes that support group decision‐making, problem‐solving, and learning.     

Weeding with Wisdom: Tuning Deselection of Print Monographs in Book-Reliant Disciplines

As university libraries transition to digital collections and new services, their book deselection projects often lead to the adoption of cross-discipline quantitative weeding criteria (such as age and low circulation) in the interest of speed and presumed fairness. Cross-discipline quantitative rubrics, however, can have unintended negative consequences when applied to disciplines such as history and literature that rely on older books with low circulation statistics. The authors argue for a discipline-differentiated approach to weeding academic library collections that can employ quantitative criteria for disciplines, such as in the sciences, that are more reliant on current materials and qualitative criteria for disciplines, such as in the humanities, whose scholars benefit from ready access to older and low-use books.