Robust observer-based fault estimation and accommodation of discrete-time piecewise linear systems

In this paper a new integrated observer-based fault estimation and accommodation strategy for discrete-time piecewise linear (PWL) systems subject to actuator faults is proposed. A robust estimator is designed to simultaneously estimate the state of the system and the actuator fault. Then, the estimate of fault is used to compensate for the effect of the fault. By using the estimate of fault and the states, a fault tolerant controller using a PWL state feedback is designed. The observer-based fault-tolerant controller is obtained by the interconnection of the estimator and the state feedback controller. We show that separate design of the state feedback and the estimator results in the stability of the overall closed-loop system. In addition, the input-to-state stability (ISS) gain for the closed-loop system is obtained and a procedure for minimizing it is given. All of the design conditions are formulated in terms of linear matrix inequalities (LMI) which can be solved efficiently. Also, performance of the estimator and the state feedback controller are minimized by solving convex optimization problems. The efficiency of the method is demonstrated by means of a numerical example.     

In the interests of the child: psychiatry,adoption, and the emancipation of the single mother and her child – the case of the Netherlands (1945–1970)

ABSTRACT

This paper discusses illegitimacy and single motherhood in the postwar period in the Netherlands from the perspective of what was considered to be in the interests of the child: being adopted by a married couple or being raised by the birthmother. It focuses particularly on the impact of psychiatry and the legalization of adoption in 1956 on the emancipation of the single mother and her child. The paper argues that the release of single motherhood and illegitimacy from the moral-religious stigmata of a “sinful fallen woman” and a “damned” or “degenerated” child has, in the Dutch case, not proceeded as a linear process. The process of emancipation toward proud and independent lone motherhood stagnated in the 1950s and 1960s because, when adoption was legalized, illegitimacy became an issue over which scientists, especially psychiatrists, gained the power of expert control. Guided by dynamic psychology and what they conceived of as the best interests of the child they declared single mothers to be victims of “sociopathology” and, consequently, unfit for motherhood. Adoption became the preferred option. This medicalised approach continued to dominate until the reawakening of feminism in the late 1960s made self-sufficient lone motherhood once more a respectable choice.     

Westward bound? Dutch education and cultural transfer in the mid-twentieth century

This article discusses the transition from philosophy to psychology as the main source of inspiration for education during the mid-twentieth century in the Netherlands, situated between Germany in the east and the English-speaking world in the west. Claims have been made that educational theory in the Netherlands was dominated by German philosophy before 1945 and subsequently turned westward for inspiration. The transnational transfer of ideas and concepts to the Netherlands is studied using textbooks on childhood and education for teachers-to-be, published between 1925 and 1970, as sources. Did the Dutch indeed turn from the east to the west for inspiration, and if so when and along the lines of which theories? This article shows that the authors of the textbooks did not simply copy theories from abroad, but gave them a reading of their own and selected what they liked. A shift from the east to the west as a source of inspiration did not occur before the 1970s. Developmentalism, personalism, phenomenology, characterology and individual psychology were all imported from German-speaking countries. It is true that some of these theories were brought to the west as their founders fled Nazism, but that does not undo their continental European origins.     

Fresh air and good food: children and the anti‐tuberculosis campaign in the Netherlands c.1900–1940

As elsewhere in the Western world, between 1900 and 1940 the anti‐tuberculosis campaign in the Netherlands produced a wide range of initiatives to promote child health. In each of these the social and the medical were linked, as the hygienic ‘mood’ was encouraged by a child‐saving ethos that focused upon the poor. In this article the author discusses the choices that were made between anti‐tuberculosis interventions for children, the benefits projected on each of these and the categories of children for whom they were meant. Private and voluntary initiatives dominated the field, whereas the state turned out to be very reluctant to take responsibility. Medically controlled health camps for ‘weak’ children were a more important instrument than open‐air schools and mass medical examination. Medical surveillance produced new categories and data which in turn justified the continued growth of child hygiene after tuberculosis had become less of a threat during the 1930s.     

Not Meta Just Data: Redefining Content and Metadata in Archival Theory and Practice1

How we imagine records affects what we acquire and how we manage it. I take up the call from Arjun Appadurai to view archives as deliberate creations, and from Hugh Taylor to use imagination as a means of creative engagement with archival theory. I explore how we can reimagine archival work, mandates, and records by eschewing divisions of content and metadata, acknowledging items and aggregations to be interchangeable concepts, and integrating data about use into archival data management.     

Book Review

This book is a good example of the contribution a clear conceptual analysis can make to highlighting and clarifying problematic thinking about real issues in education. In the literature there are different claims of varying strength and plausibility which require very careful sorting. David Carr demonstrates such careful sorting in the difficult field of ethics and maps some paths for fruitful thinking about professionalism in teaching. 'The distinctions of Peters and others between education and teaching, theory and practice, and intrinsic and instrumental value, stand in need of more careful mapping and refinement' which could enable us to steer clear of 'educationally pernicious conclusions' (p. 179). Carr succeeds in doing just this.     

A novel on-chip three-dimensional micromachined calorimeter with fully enclosed and suspended thin-film chamber for thermal characterization of liquid samples

A microfabricated calorimeter (μ-calorimeter) with an enclosed reaction chamber is presented. The 3D micromachined reaction chamber is capable of analyzing liquid samples with volume of 200 nl. The thin film low-stress silicon nitride membrane is used to reduce thermal mass of the calorimeter and increase the sensitivity of system. The μ-calorimeter has been designed to perform DC and AC calorimetry, thermal wave analysis, and differential scanning calorimetry. The μ-calorimeter fabricated with an integrated heater and a temperature sensor on opposite sides of the reaction chamber allows to perform thermal diffusivity and specific heat measurements on liquid samples with same device. Measurement results for diffusivity and heat capacitance using time delay method and thermal wave analysis are presented.     

Child guidance,dynamic psychology and the psychopathologisation of child-rearing culture (c. 1920-1940): a transnational perspective

ABSTRACT

The historiography of child guidance has focused primarily on the United States, where it first developed before travelling across the English-speaking world. The rapid expansion of child guidance in the interwar years was enabled by private philanthropy, which provided fellowships to foreign professionals to study in the United States. This article focuses upon the transnational transfer of child guidance, the dynamic psychology on which it was based, and the accompanying psychopathologisation of child-rearing culture to a non-English speaking country, the Netherlands. First, it discusses the development of child guidance and the reception of dynamic psychology in the United States and Britain. Next, it analyses the transfer to the Netherlands. It turns out that the Dutch did not copy the American model, but adapted it to fit their conditions and created a more diverse child guidance landscape, in which educational psychology played a less important role than child psychiatry.