Digital Peer Publishing

    Software Engineering and eLearning: The MuSofT Project

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    eLearning supports the education in certain disciplines. Here, we report about novel eLearning concepts, techniques, and tools to support education in Software Engineering, a subdiscipline of computer science. We call this "Software Engineering eLearning". On the other side, software support is a substantial prerequisite for eLearning in any discipline. Thus, Software Engineering techniques have to be applied to develop and maintain those software systems. We call this "eLearning Software Engineering". Both aspects have been investigated in a large joint, BMBF-funded research project, termed MuSofT (Multimedia in Software Engineering). The main results are summarized in this paper

    Integration of e-learning outcomes into work processes

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    Three case studies of in-house developed e-learning education in public organizations with different pedagogical approaches are used as a starting point for discussion regarding the implementation challenges of e-learning at work. The aim of this article is to contribute to the understanding of integrating mechanisms of e-learning outcomes into work processes in large, public organizations. The case studies were analyzed from a socio-cultural perspective using the MOA-model as a frame of reference. Although the pedagogical approaches for all of the cases seemed to be relevant and most of the learners showed overall positive attitudes towards the courses, there were problems with integration of the e-learning outcomes into work processes. There were deficiencies in the adaption of the course contents to the local educational needs. There was also a lack of adjusting the local work organization and work routines in order to facilitate the integration of the e-learning outcomes into the work processes. A lack of local management engagement affected the learners’ motivation negatively. Group discussions in local work groups facilitated the integration of the e-learning outcomes. Much of the difficulties of integrating e-learning outcomes into work processes in big organizations are related to the problems with adjusting centrally developed e-learning courses to local needs and a lack of co-operation among among the developers (often IT-professionals) and the Human Resources Department of the organizations

    Orphan Care: An Introduction

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    This collection aims to cast light on the social work profession and its care for orphans in middle and low income nations. Four countries are profiled in this work, and the focus in each portrayal is the work done by professionals as well as the socio-political context of this work in the area of care for orphaned children. As will be argued later, both our international perspective and our understanding of the needs and care of orphans around the world are limited in the English language social work literature. This work represents an attempt to address these limitations. I whole-heartedly embrace Watts’ urgent call, “International and comparative social work and social welfare have some catching up to do…In order to seek answers, we need to recognize we have much to learn from each other. We have much to learn about how social work is practiced in countries different from our own. We have much to learn about the similarities and the differences in social work in various countries. Our learning about its many facets and expressions can challenge our own interpretations of reality and our own truth claims and move us to new ways of thinking and new ways of understanding” (1997, p. 5)

    Thermographie zur Temperaturmessung beim Laser-Sintern – ein Beitrag zur Qualitätssicherung?

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    Beim Laser-Sintern wird das Pulverbett durch Heizstrahler vorgeheizt, um an der Pulveroberfläche eine Temperatur knapp unterhalb des Materialschmelzpunktes zu erzielen. Dabei soll die Temperaturverteilung auf der Oberfläche möglichst homogen sein, um gleiche Bauteileigenschaften im gesamten Bauraum zu erzielen und den Bauteilverzug gering zu halten. Erfahrungen zeigen jedoch sehr inhomogene Temperaturverteilungen, weshalb oftmals die Integration von neuen oder optimierten Prozessüberwachungssystemen in die Anlagen gefordert wird. Ein potentiell einsetzbares System sind Thermographiekameras, welche die flächige Aufnahme von Oberflächentemperaturen und somit Aussagen über die Temperaturen an der Pulverbettoberfläche erlauben. Dadurch lassen sich kalte Bereiche auf der Oberfläche identifizieren und bei der Prozessvorbereitung berücksichtigen. Gleichzeitig ermöglicht die Thermografie eine Beobachtung der Temperaturen beim Lasereingriff und somit das Ableiten von Zusammenhängen zwischen Prozessparametern und Schmelzetemperaturen. Im Rahmen der durchgeführten Untersuchungen wurde ein IR-Kamerasystem erfolgreich als Festeinbau in eine Laser-Sinteranlage integriert und Lösungen für die hierbei auftretenden Probleme erarbeitet. Anschließend wurden Untersuchungen zur Temperaturverteilung auf der Pulverbettoberfläche sowie zu den Einflussfaktoren auf deren Homogenität durchgeführt. In weiteren Untersuchungen wurden die Schmelzetemperaturen in Abhängigkeit verschiedener Prozessparameter ermittelt. Auf Basis dieser Messergebnisse wurden Aussagen über erforderliche Optimierungen getroffen und die Nutzbarkeit der Thermografie beim Laser-Sintern zur Prozessüberwachung, -regelung sowie zur Anlagenwartung als erster Zwischenstand der Untersuchungen bewertet.The powder bed surface in laser sintering is preheated to a temperature close to the material’s melting point by a radiant heater. The distribution of temperatures on the surface should be as homogeneous as possible to achieve equal part properties in the whole build space and to get minor part warpage. However, experiences show very inhomogeneous temperature distributions. Therefore, it is often asked for the integration of new process monitoring systems in the machines. One possible solution to perform this task is thermal imaging, which enables a 2-dimensional measurement of surface temperatures and can give information on the temperature of the powder bed surface. Thereby, cold areas can be detected on the surface and can be considered in pre-processing. Additionally thermal imaging enables the monitoring of the temperature while the laser is working and therefore it gives the possibility to establish correlations between the process parameters and the temperature of the melt. Within the scope of the analysis done, a thermal imaging system was successfully integrated in a laser sintering machine. At the same time, necessary solutions were developed for the problems which emerged from the integration of the system. Afterwards, the temperature distribution on the part bed surface was determined. Additionally, influence factors on the homogeneity of the part bed surface’s temperature were analysed. Further analysis was done to determine the temperature of the melt as a function of different process parameters. Conclusions for required optimisations were educed from the measurement results; and the usability of thermal imaging in laser sintering for process monitoring, process control and maintenance was evaluated as a first intermediate result of the analysis

    Looking for Newton: Realistic Modeling in Modern Biology

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    Cost Sharing under Uncertainty: An Algorithmic Approach to Cooperative Interval-Valued Games

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    Recently, Branzei, Dimitrov, and Tijs (2003) introduced cooperative interval-valued games. Among other insights, the notion of an interval core has been coined and proposed as a solution concept for interval-valued games. In this paper we will present a general mathematical programming algorithm which can be applied to find an element in the interval core. As an example, we discuss lot sizing with uncertain demand to provide an application for interval-valued games and to demonstrate how interval core elements can be computed. Also, we reveal that pitfalls exist if interval core elements are computed in a straightforward manner by considering the interval borders separately

    Selektives Lasersintern von teilkristallinen Thermoplasten

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    Da eine flexible Fertigung im Bereich von Losgrößen zwischen 1-1000 Stück in vielen Wirtschaftszweigen vermehrt an Bedeutung gewinnt, steigt das Interesse an Verfahren wie dem Selektiven Lasersintern. Dennoch sollen die Eigenschaften von in Serie eingesetzten Werkstoffen erreicht werden. Aufgrund der bestehenden werkstofflichen Restriktionen auf Polyamid 12 wird aktuell an der Verarbeitung anderer teilkristalliner Thermoplaste geforscht. In diesem Beitrag werden die sich in der Markteinführung befindlichen Werkstoffe vorgestellt und basierend auf der Verarbeitung weiterer Thermoplaste die bestehende Modellvorstellung zum Lasersintern erweitert.As a flexible manufacturing for lot sizes of 1-1000 components gains more interest in many branches of trade, technologies such as selective laser sintering (SLS) become more interesting. Nevertheless should the properties of materials used in series manufacturing be achievable. Mainly polyamide 12 can be used for direct part generation. This leads to restrictions for many applications. Thus research on other types of polymers plays a major role in applying additive manufacturing in the serial production of individual products. In this paper, the suitability and processing behavior with respect of melting, (isothermal) crystallization, morphology resulting and part properties of new thermoplastics is presented and compared to commercially available powders. By using thermoanalytical methods, comprehensive process simulation can be carried out

    Educational Television Broadcasting in Germany: Prevailing Practices, Existing Challenges and Adoptable Policies

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    Television is widely used for educational purposes but has still not achieved its fullest potential neither in developed nor in developing countries. This worldwide under performance invite experts and academics to join hands to search causes and provide suggestions to make television a better and popular learning tool. Guided by this philosophy, the present paper analyzes the educational television broadcasting in Germany from different perspectives. The focus of analysis includes measures and practices adopted by German institutions/broadcasters to promote educational television. Besides dealing with these issues, the paper discusses existing challenges and suggests best adoptable educational television broadcasting polices from Germany to promote educational television in global perspectives
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