Proof and application

This paper outlines an epistemological conception which attempts to relate the formal aspects of mathematical proof to its pragmatic dimensions. In addition to the key concept of application, the paper makes use of several concepts from the domain of analytical philosophy, to present a view of proof that might best be categorized as a dialectical one. A number of implications for teaching are discussed.     

Alternative teacher education in the Netherlands 2000–2005. A standards‐based synthesis

Findings are synthesized from six evaluation studies of alternative teacher certification programs introduced in the Netherlands between 2000 and 2005. The available evidence raises concerns about the feasibility of accelerated workplace learning for aspiring teachers. Intake assessments amounted mostly to selection procedures, while less attention was paid to advising candidates. In candidates' workplace learning, work often overrode learning. They received little mentoring and were offered few opportunities to qualify themselves in all basic aspects of teaching. Conclusions and recommendations regarding the development of alternative teacher education are formulated on the basis of five quality standards for teacher education.

Entre 2000 et 2005, les Pays‐Bas ont mis en place des parcours parallèles pour la formation des enseignants. Dans cet article, l'auteur présente les résultats de six études qui ont évalué la qualité de ces parcours parallèles. Les résultats disponibles soulèvent des questions quant à la possibilté de réaliser des formations accélérées effectuées sur le terrain et destinées aux futurs enseignants. Dans ces formations accélérées, l'évaluation initiale (intake assessment) servait la plupart du temps à sélectionner les candidats tandis que peu d'attention était accordée à la fonction conseil. Lorsque les candidats étaient formés sur le terrain, la pratique prenait le dessus sur la formation. Ils n'étaient guère encadrés et avaient peu l'occasion de se familiariser avec tous les aspects fondamentaux du métier d'enseignant.

S'inspirant de cinq standards de qualité pour la formation des enseignants, l'auteur présente ses conclusions et ses recommandations pour la mise en place de parcours parallèles en ce qui concerne la formation des enseignants.

Se sintetizan los resultados de seis estudios en los que han sido evaluados programas alternativos de certificación de profesores que han sido introducidos entre 2000 y 2005 en los Países Bajos. La evidencia disponible plantea cuestiones sobre la viabilidad de aprendizaje acelerado por futuros profesores en el lugar de trabajo. Las evaluaciones llevadas a cabo se limitaban a menudo a procedimientos de selección, mientras que se solía prestar menos atención al asesoramiento de los candidatos. En su lugar de trabajo, el proceso de aprendizaje de los futuros profesores fue relegado a segundo plano a causa del trabajo. Resultó que los futuros profesores recibieron poca tutoría y que se les ofrecieron pocas oportunidades de cualifarse en todos los aspectos de la enseñanza. Se sacan conclusiones y se hacen recomendaciones en cuanto al desarrollo de programas alternativos de formación del profesorado a base de cinco criterios de calidad para la formación del profesorado.

In diesem Forschungsbericht werden die Ergebnisse von sechs Evaluationsstudien zu den zwischen 2000 und 2005 in den Niederlanden eingeführten alternativen Lehrerausbildungsprogrammen zusammengezogen. Die Befunde lassen Fragen über die Realisierbarkeit von beschleunigtem Lernen während der Arbeit durch ankommende Lehrer aufkommen. Zulassungsprüfungen beinhalteten meistens Ausleseverfahren, wobei der Beratung von Kandidaten weniger Aufmerksamkeit geschenkt wurde. In dem Lernen von Kandidaten während der Arbeit war der Arbeitsaspekt haüfig stärker vertreten als das Lernen. Sie empfingen wenig Betreuung und erhielten wenig Gelegenheit, sich in allen grundlegenden Lehrerfähigkeiten zu qualifizieren. Es werden Schlussfolgerungen und Empfehlungen bezüglich der Entwicklung von alternativen Lehrerausbildungsprogrammen formuliert aufgrund von fünf Qualitätsstandarden zur Lehrerausbildung.     

Accuracy between optical and inertial motion capture systems for assessing trunk speed during preferred gait and transition periods

Motion capture through inertial sensors is becoming popular, but its accuracy to describe kinematics during changes in walking speed is unknown. The aim of this study was to determine the accuracy of trunk speed extracted using an inertial motion system compared to a gold standard optical motion system, during steady walking and stationary periods. Eleven participants walked on pre-established paths marked on the floor. Between each lap, a 1-second stationary transition period at the initial position was included prior to the next lap. Resultant trunk speed during the walking and transition periods were extracted from an inertial (240 Hz sampling rate) and an optical system (120 Hz sampling rate) to calculate the agreement (Pearson’s correlation coefficient) and relative root mean square errors between both systems. The agreement for the resultant trunk speed between the inertial system and the optical system was strong (0.67 < r ≤ 0.9) for both walking and transition periods. Moreover, relative root mean square error during the transition periods was greater in comparison to the walking periods (>40% across all paths). It was concluded that trunk speed extracted from inertial systems have fair accuracy during walking, but the accuracy was reduced in the transition periods.     

Make Way for the Robots! Human- and Machine-Centricity in Constituting a European Public–Private Partnership

Minerva - This article is an analytic register of recent European efforts in the making of ‘autonomous’ robots to address what is imagined as Europe’s societal challenges. The...     

Editorial introduction

Editorial introduction     

Between-school variation in physical activity,aerobic fitness,and organized sports participation: A multi-level analysis

Abstract

A large proportion of a child's day is spent at school interacting with certain physical surroundings, teachers, and school friends. Thus, schools could have a marked impact on establishing physical activity habits. The aim of the present study was to assess between-school variation in physical activity, aerobic fitness, and organized sports participation. Altogether, we tested 1766 nine- and fifteen-year-old children attending 242 school classes at 35 different schools in Denmark in 1997–2003. The intra-class correlation coefficient (ICC) for objectively assessed physical activity ranged between 0.06 and 0.18 depending on the dimension of physical activity and the time considered (i.e. school time vs. leisure time). For aerobic fitness, an ICC of 0.10 was observed, whereas that for organized sports participation ranged between 0.01 and 0.10 depending on the age group. Studying between-school variation in physical activity provides information about the extent to which children adjust their physical activity habits according to the social and environmental circumstances that they share, and helps to plan future school-based physical activity studies, especially in terms of sample size and power calculation.     

Protein and cell patterning in closed polymer channels by photoimmobilizing proteins on photografted poly(ethylene glycol) diacrylate

Definable surface chemistry is essential for many applications of microfluidic polymer systems. However, small cross-section channels with a high surface to volume ratio enhance passive adsorption of molecules that depletes active molecules in solution and contaminates the channel surface. Here, we present a one-step photochemical process to coat the inner surfaces of closed microfluidic channels with a nanometer thick layer of poly(ethylene glycol) (PEG), well known to strongly reduce non-specific adsorption, using only commercially available reagents in an aqueous environment. The coating consists of PEG diacrylate (PEGDA) covalently grafted to polymer surfaces via UV light activation of the water soluble photoinitiator benzoyl benzylamine, a benzophenone derivative. The PEGDA coating was shown to efficiently limit the adsorption of antibodies and other proteins to <5% of the adsorbed amount on uncoated polymer surfaces. The coating could also efficiently suppress the adhesion of mammalian cells as demonstrated using the HT-29 cancer cell line. In a subsequent equivalent process step, protein in aqueous solution could be anchored onto the PEGDA coating in spatially defined patterns with a resolution of <15 μm using an inverted microscope as a projection lithography system. Surface patterns of the cell binding protein fibronectin were photochemically defined inside a closed microfluidic device that was initially homogeneously coated by PEGDA. The resulting fibronectin patterns were shown to greatly improve cell adhesion compared to unexposed areas. This method opens for easy surface modification of closed microfluidic systems through combining a low protein binding PEG-based coating with spatially defined protein patterns of interest.     

Formal and informal interorganizational learning within strategic alliances

Learning behaviors of employees can be either formalized (in the form of programmed events and visits) or informal (in the form of spontaneous interaction and knowledge sharing). We investigate the effect that both types of learning behaviors have on interorganizational learning of substantive knowledge in the context of an alliance. We also look at the effects that the two forms of learning behavior have on each other. We find that while informal learning behaviors have a consistently positive effect on the learning outcome and on formal learning behaviors, this is not so for formal learning behaviors. The effect of formal behaviors on both learning outcome and informal behaviors, while positive, diminishes at higher levels. This leads us to conclude that although both informal and formal learning behaviors foster interorganizational learning, too much formalization obstructs learning. Similarly, while formally programmed behaviors do encourage informal learning behaviors of the boundary spanners, an excess of formalization stifles them.