Das lange Leben lernen     

Prof. James W. Vaupel Ph. D.  Dr. Dirk Hofäcker 《Zeitschrift für Erziehungswissenschaft》2009,12(3):383-407

In the industrialized world the probability of people reaching higher ages has risen substantially over the past decade. Falling birth and mortality rates have led to changes in the population structure. In Germany, the population will be aging rapidly over the next (decades), with the new demographic situation necessitating adjustment and re-orientation on the individual and socio-political level. We argue that the adjustment strategies should focus on the promotion of education across all phases of life and population groups. This applies to the issue of health, for example, since future strains on the social welfare system and macroeconomic performance are affected, among other factors, by the state of health of the growing number of elderly people. Education boosts health-promoting behavior, thus increasing the chances of an individual enjoying a long, active life. Besides, educational training and professional development are gaining importance owing to demographic change as the changes in the population structure will require individuals to work longer over their working lives and lead to a more even distribution of gainful employment across the life course. Education is a worthwhile investment, in particular as the prospects for long life are rising and because it enables people to lead their lives as responsible agents, to take charge of their personal individual and professional development, and to assure their livelihood.  相似文献   

Klassifikation von Leistungsprofilen im Handballsprungwurf     

Jörg M. Jäger  Dirk Büsch  Hermann Müller 《Sportwissenschaft》2018,48(1):129-135

The jump throw is one of the most applied techniques in handball. Therefore, analyzing its underlying performance factors is important since they may provide a basis to adjust training interventions. Currently, the coach decides what needs to be improved in order to enhance the overall performance of an athlete. The aim of this study is to break down the performance factors in jump throws and to assign athletes to subgroups. This classification should allow athletes to benefit from the resulting group-specific training contents and may support a coach in deciding about the next steps in his training program. A total of 113 male handball players (age 15 ± 0.38 years, height 184.07 ± 7.1?cm, weight 74.83 ± 9.31?kg) participated in this study. From each athlete the standing reach height (SRH), the jumping reach height achieved with a countermovement jump (JRH), the maximal ball height achieved with a handball-specific single-legged jump and straight arm (BHJ), and the ball release height achieved in a jump throw (BHT) were measured. Performance factors were derived as differences between these measurements (JRH ? SRH = UJA for unspecific jump ability, BHJ ? JRH = SJT for specific jump technique, BHT ? BHJ = STT for specific throwing technique). A hierarchical cluster analysis was used to find groups of athletes based on the derived and scaled difference measures (UJA, SJT, STT). The dendrogram shows a clear distinction of four groups of athletes. Average values within each cluster reveal (A) one group with high UJA values, (B) one with low UJA values, (C) one with high SJT but low STT, and (D) one with low SJT but high STT. These results may be interpreted with respect to consequences for training because group (B) seems to benefit most from a general strength training while the properties of group (A), (C), and (D) recommend a focus on technical aspects of performance.  相似文献   

Kieferchirurgische Operationsplanung mit Hilfe von Techniken der virtuellen Realit?t     

Dirk Siebert  Patrick Neumann  Armin Schulz  Gabriele Faulkner  Thomas Tolxdorff 《Informatik - Forschung und Entwicklung》2001,4(3):93-102

Für ein vollst?ndig computergestütztes Planungssystem zum Zwecke der kieferchirurgischen Operationsplanung ist die Bereitstellung von virtuellen Werkzeugen für den Chirurgen eine grundlegende Voraussetzung. Ausgehend von den Volumendaten mit Sch?del- und Kieferknochen des Patienten erm?glicht ein einfaches Interface unter Verwendung einer geeigneten Visualisierung und haptischer Eingabeger?te die interaktive Definition und Manipulation einzelner virtueller Knochensegmente. Wir haben moderne kraftrückgekoppelte Ger?te aus dem Niedrigpreisbereich eingebunden und auf ihre F?higkeit untersucht, das dreidimensionale Verst?ndnis im Planungsproze?durch Anlehnung an die Vorg?nge bei der chirurgischen Prozedur zu erh?hen. Durch diese Eingabeger?te ist es m?glich, die Knochensegmentierung für eine Osteotomie des Unterkiefers intuitiver und schneller durchzuführen. Die definierten Teilvolumina ergeben zusammen mit ihrer r?umlichen Neuanordnung auf Grundlage einer kephalometrischen Analyse einen Operationsplan. Nach erfolgter Planung werden die Planungsergebnisse in den Operationssaal übertragen. Die intraoperativen Techniken beinhalten die Visualisierung der Planungsergebnisse, die Steuerung der Anwendung über Sprache und die Bestimmung der Patientenposition mittels eines elektromagnetischen 3D-Trackingsystems.  相似文献   

Neuropsychological treatment of dyslexia: does type of treatment matter?     

Lorusso ML  Facoetti A  Bakker DJ 《Journal of learning disabilities》2011,44(2):136-149

In this study, 123 children with a diagnosis of developmental dyslexia were assigned to different treatment groups, either variations of Bakker's intervention program based on the balance model or a control, a specific reading training group. Thorough cognitive and neuropsychological assessment allowed determination of the subtype of dyslexia according to the balance model and the neuropsychological profile with respect to reading and spelling abilities, verbal memory, and phonemic awareness. Characteristics of hemisphere-specific stimulation were systematically manipulated in an effort to shed light on the bases and mechanisms of reading improvement. It was shown that the effects of treatment vary according to type of dyslexia and that the different intervention programs have differential effects on reading-related neuropsychological functions. Since opposite effects can be produced by the same type of treatment in different dyslexia subtypes, the results of the study suggest that accurate classification of subtype on the base of reading and reading-related variables is advantageous for an optimal planning of the therapy.  相似文献   

The mystery of cognitive structure and how we can detect it: tracking the development of cognitive structures over time     

Dirk Ifenthaler  Iskandaria Masduki  Norbert M. Seel 《Instructional Science》2011,39(1):41-61

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Das AutoMoDe-Projekt
Modellbasierte Entwicklung softwareintensiver Systeme im Automobil     

Andreas Bauer  Manfred Broy  Jan Romberg  Bernhard Sch?tz  Peter Braun  Ulrich Freund  Nuria Mata  Robert Sandner  Pierre Mai  Dirk Ziegenbein 《Informatik - Forschung und Entwicklung》2007,48(2):45-57

Die Entwicklung eingebetteter Software für Automobile ist inh?rent komplex und vereint verschiedene Entwicklungsphasen, mehrere fachliche Disziplinen, sowie verschiedene Akteure in beteiligten Unternehmen. Der AutoMoDe-Ansatz zur Entwicklung automotiver Software beschreibt Systeme auf verschiedenen Abstraktionsebenen und definiert schrittweise überg?nge zwischen diesen Ebenen. Neben der Definition geeigneter Ebenen werden zur Modellierung von Echtzeitsystemen ein einheitliches Berechnungsmodell sowie dom?nenspezifische Beschreibungstechniken verwendet. Automatisierte Anbindungen für Analyse und Synthese komplexer Softwaresysteme mit dem Ziel eines konsistenzbetonten Entwicklungsprozesses wurden realisiert. Die beschriebenen Techniken wurden in den Werkzeugprototypen AutoFocus integriert und im Zusammenspiel mit einer Werkzeugkette demonstriert.  相似文献   

Identifying cross-domain distinguishing features of cognitive structure     

Dirk Ifenthaler 《Educational technology research and development : ETR & D》2011,59(6):817-840

Our research aims to identify domain-specific similarities and differences of externalized cognitive structures. Cognitive structure, also known as knowledge structure or structural knowledge, is conceived as the manner in which an individual organizes the relationships of concepts in memory. By diagnosing these structures precisely, even partially, the educator comes closer to influencing them through instructional settings and materials. Our assessment and analysis of cognitive structures is realized within the HIMATT tool, which automatically generates four quantitative indicators for the structural entities of written text or causal maps. In our study, participants worked on the subject domains biology, history, and mathematics. Results clearly indicate different structural and semantic features across the three subject domains. Additionally, we found that written texts and causal maps seem to represent different structure and content across the three subject domains when compared to an expert??s representation. We conclude with a general discussion, instructional implications and suggestions for future research.  相似文献   

Professional development across the teaching career: Teachers’ uptake of formal and informal learning opportunities     

Dirk Richter  Mareike KunterUta Klusmann  Oliver LüdtkeJürgen Baumert 《Teaching and Teacher Education》2011,27(1):116-126

This study examined teachers’ uptake of formal and informal learning opportunities across the career cycle. Analyses were based on data from 1939 German secondary teachers in 198 schools. Results showed that formal learning opportunities (in-service training) were used most frequently by mid-career teachers, whereas informal learning opportunities showed distinct patterns across the teaching career. Specifically, use of professional literature increased with teacher age, but teacher collaboration decreased. Teachers’ work engagement and professional responsibilities were hypothesised to predict changes over the career. However, although these variables partly predicted uptake of learning opportunities, they did not fully explain the age-related differences observed.  相似文献   

Control of propulsion and body lift during the first two stances of sprint running: a simulation study     

Sofie Debaere  Christophe Delecluse  Dirk Aerenhouts  Friso Hagman 《Journal of sports sciences》2015,33(19):2016-2024

The aim of this study was to relate the contribution of lower limb joint moments and individual muscle forces to the body centre of mass (COM) vertical and horizontal acceleration during the initial two steps of sprint running. Start performance of seven well-trained sprinters was recorded using an optoelectronic motion analysis system and two force plates. Participant-specific torque-driven and muscle-driven simulations were conducted in OpenSim to quantify, respectively, the contributions of the individual joints and muscles to body propulsion and lift. The ankle is the major contributor to both actions during the first two stances, with an even larger contribution in the second compared to the first stance. Biarticular gastrocnemius is the main muscle contributor to propulsion in the second stance. The contribution of the hip and knee depends highly on the position of the athlete: During the first stance, where the athlete runs in a forward bending position, the knee contributes primarily to body lift and the hip contributes to propulsion and body lift. In conclusion, a small increase in ankle power generation seems to affect the body COM acceleration, whereas increases in hip and knee power generation tend to affect acceleration less.  相似文献   

Higher education policy change and the hysteresis effect: Bourdieusian analysis of transformation at the site of a post-apartheid university     

Wayne Peter Dirk  Derik Gelderblom 《Higher Education》2017,74(2):341-355

In this article we focus on constraints to post-apartheid transformation in the higher education sector of South Africa via a case study of an attempt to introduce a new curriculum for the Bachelor of Education. Thirty-one semi-structured interviews were the main data-gathering method. We use Pierre Bourdieu’s concepts of field, capital, habitus and hysteresis to explain why transformation proved difficult in this case. We analyse the higher education field that gave rise to this curriculum with a brief historical overview of the position of Afrikaners as the dominated part of the dominant white group in the early years of the twentieth century. Their lack of cultural, economic and intellectual capital gave rise to a position-taking that placed Afrikaans language universities in general and Faculties of Education in particular into the heteronomous part of the higher education field. At first the curriculum, and their intellectual habitus, was in synch. However, it started to drift apart because of a number of economic and political changes that made their position at the heteronomous part of the higher education field increasingly untenable. Because of their insulation from the wider higher education field, academics in the Faculty of Education were at first only vaguely aware of the implications of these changes. However, when a dean was appointed in 2000 with a mandate to transform the curriculum for the BEd, they experienced hysteresis, and they were no longer feeling at home in the field. This explains why the new curriculum was consequently substantially subverted.  相似文献