Leg amputation side determines performance in curve sprinting: a case study on a Paralympic medalist     

Johannes Funken  Kai Heinrich  Steffen Willwacher  Ralf Müller  Jonas Böcker  Hiroaki Hobara 《Sports biomechanics / International Society of Biomechanics in Sports》2019,18(1):75-87

The lower limb kinetics of curve sprinting in amputees are not well described in the literature, particularly with respect to the effect of the side of amputation. This is an issue due to the importance of the knowledge for prosthetic design and classification of athletes. Thus, the aim of this study was to investigate the influence of side of amputation on curve sprinting performance in athletes with a unilateral leg amputation. A three-dimensional motion analysis system (Vicon), four force plates (Kistler) and a modified mathematical human model (ALASKA) were used to compare clockwise and counter clockwise curve sprinting lower limb kinematics and kinetics of a Paralympic medalist with a left-sided knee exarticular amputation. Results reveal that vertical ground reaction force application and total vertical impulse were lower when the affected limb was at the inside of the curve. The unaffected limb showed joint mechanics different to those established for non-amputee athletes and might contribute better to propulsion when being the inside limb. Curve sprinting biomechanics and the ability to attain high radial velocities are directly dependent on the side of amputation relative to the curve direction in a unilateral amputee athlete of highest performance level.  相似文献   

Identifying teaching groups as a basis for academic development     

Eva Heinrich 《高等教育研究与发展》2015,34(5):899-913

Academic development recognizes the strengths of communities, such as communities of practice or learning communities, in providing academics with supportive environments for the development of teaching. The problem academic development faces is that not enough academics are involved in these communities. Instead of trying to interest academics in joining communities, this research looks at the existing contexts around academics, which it refers to as ‘teaching groups’. It is proposed that every academic involved in teaching belongs to at least one teaching group, formed by colleagues teaching in the same course, degree or subject and that teaching groups form relevant contexts for engagement with teaching. The research investigates how teaching groups compare to communities and finds that less than half of teaching groups named by participants have strong community characteristics, indicating large space for improvement in the remaining majority of groups. The suggestion is made that identifying teaching groups across an institution might provide a promising starting point for engaging a majority of academics and working with these academics towards increased interaction on teaching in open and trusting collegial atmospheres.  相似文献   

Retracking on a grand scale: policy and pedagogy in the reform of eastern German secondary schools after the fall of socialism     

Heinrich Mintrop 《教育政策杂志》2013,28(5):333-354

This article reports on a multi‐year study of changes in eastern German schools after the fall of the Berlin Wall. In the wake of national unification, the traditional three‐track structure of the West German educational syatem was re‐institutionalized in eastern German secondary schools. The article explores how teachers respond to this shift from the untracked socialist common school to the new track system. The study found that influences of state policies on teachers’ tracking pedagogy varied. The new institutions have forcefully shaped many teachers’ assumptions about students’ ability and career paths. Value orientations are characterized by ambivalence; while organizational goals and values are very exclusion‐oriented, the role of schools in society is defined in more inclusive terms. Contrary to exclusion‐oriented sentiments, instructional routines changed little; they flow, to a large extent, from the previous inclusive curriculum that was geared to the average or ‘normal’ student during socialist times. The study underlines the importance of examining multiple layers of beliefs and practices for an adequate understanding of the relationship between policy and practice.  相似文献   

Discrimination and generalization of leaf damage by blue jays (Cyanocitta cristata)     

Pamela G. Real  Ruth Iannazzi  Alan C. Kamil  Bernd Heinrich 《Learning & behavior》1984,12(2):202-208

Blue jays (Cyanocitta cristata) responded to projected black-and-white silhouettes of cherry leaves that were either undamaged or were damaged by either cryptic caterpillars that disguise leaf damage due to their feeding or by noncryptic caterpillars that do not disguise leaf damage due to their feeding. Pecks to the key on which the images were projected were reinforced only if interresponse times fell within specified temporal boundaries. These boundaries were different in the presence of the two types of leaf damage. Following training with one exemplar of each damage type, the jays correctly categorized novel instances of both types. They categorized novel undamaged leaves as if they were examples of leaves showing damage by cryptic caterpillars. Results suggest that the jays can readily discriminate and generalize to new members of a polymorphous stimulus class. The results suggest that techniques for the study of concept formation in animals can be applied to an animal’s ability to categorize stimuli that are involved in a potential prey-predator relationship.  相似文献   

The Training of Civil Engineers and Architects in the Five New German LänderBefore and After Reunification     

Heinrich Rothert 《European Journal of Engineering Education》1995,20(2):261-276

The fall of the Iron Curtain in 1989 led to the collapse of the communistic regimes in the Soviet‐dominated Eastern and Central European countries. The so‐called ‘East’ Germany, the German Democratic Republic (GDR), which in West German terminology means ‘Central’ or ‘Middle’ Germany, became part of the German Federal Republic on 3 October 1990. In the treaty on the establishment of German unity, the German Science Council (Wissenschaftsrat,) was given the task by the Federal Government and by those of the States (Länder) to undertake a survey of publicly financed facilities for science and research in the former GDR and make proposals for necessary renewal. The author was a member of two of the working groups of the German Science Council, in charge of producing an expert opinion on the future structure of engineering education in the five new Länder and Berlin (East). Having known the situation in the GDR long before the Wall came down, the author describes briefly the training of civil engineers and architects before and after German unification. Not every step in the legal procedure in the new five Länder can be documented here, and it is also not intended to discuss scientific research in the GDR in great detail. All the data produced in the following tables are taken from the reports of the German Science Council [1, 2]. For a better understanding of German school and university training, see [3]. When statements by ‘insiders’ are cited, colleagues in the GDR, well known to the author before 1990, are meant.  相似文献   

Treatment outcome for a maltreated population: benefits, procedural decisions, and challenges     

Gothard S  Ryan B  Heinrich T 《Child abuse & neglect》2000,24(8):1037-1045

OBJECTIVE: To review the benefits, challenges, and procedural decisions to consider when implementing and managing a treatment outcome program for a maltreated population. METHOD: We reviewed the reasons to implement a treatment outcome program, decisions regarding procedures, and challenges likely to be encountered based on literature in the field and the authors' 6 years of experience in developing and maintaining an outcome program at a center specializing in the treatment of maltreated children. RESULTS: The development of an outcome programs requires careful measurement selection, early and ongoing staff-involvement, support from higher management, a well-developed data base and client tracking system, a coordinator and support staff, clinical utility, planning for fiscal impact, and flexibility to contend with challenges. CONCLUSIONS: Based on our experience, the plethora of clinically rich and administratively useful information derived from an outcome program far outweighs the challenges and costs of establishing and maintaining an outcome program.  相似文献   

Quality Teaching and Learning in Australian and South African Universities: Comparing policies and practices     

Lesley Vidovich  Magda Fourie  Heinrich Alt  Louis Van Der Westhuizen  Somarie Holtzhausen 《Compare》2000,30(2):193-209

Over the last decade universities across the world have been grappling with quality and quality assurance issues. In several countries national policies on higher education quality assurance have been evolving, mostly with the purpose of putting external systems of quality assurance in place. In many instances, these policies and systems had less effect on the quality of teaching and learning than had been expected. This paper serves as a comparison of national quality policy developments in two countries, Australia and South Africa, and goes on to investigate the emerging tensions in quality policy processes in these countries. Whereas a number of similarities were discerned, differences were as evident, verifying the underlying assumption of the authors that notions of quality, and quality policies and their implementation are very much dependent on the particular localised contexts in which they exist.  相似文献   

Direct skeletal attachment prosthesis for the amputee athlete: the unknown potential     

Munjed Al Muderis  Horst Heinrich Aschoff  Belinda Bosley  Guy Raz  Ludger Gerdesmeyer  Brendan Burkett 《Sports Engineering》2016,19(3):141-145

Lower limb amputees often experience complications with the use of conventional socket-type prostheses, which further reduce their already compromised ability to perform the activities of daily living, or to participate in sporting activities. During the last two decades, a new technology of direct skeletal attachment (osseointegration) of prosthesis to the femoral residuum has been developed. The aim of this research was to assess the implant design, surgery protocols, and functional testing of this new technology on the first 100 patients using the Integral Leg Prosthesis procedure. This new knowledge can guide future engineering developments of osseointegration within the sporting arena. Between 1999 and 2013, direct skeletal implantation was performed on 112 amputees, from two centres in Germany and Australia. From the experience of the surgical team, modifications were made to the implant design. This re-engineering of the implant has reduced the surgical revisions due to infection from 29 % with the early implant design down to 7 %. The functional testing of the 34 Australian cases were assessed pre- and 12 months post-implant with significant improvements of one complete K-scale; the Q-TFA measures increased (50.9–86.7), whilst the Timed Up and Go decreased significantly (12.43 s ± 3.89 to 8.03 s ± 2.80), and the 6 min walk increased (304.0–383.9 m). From these findings, osseointegration technology is realistically the way of the future for amputee athletes. Further refinement of the implant design and sports-specific functional testing are required to define the potential of this technology.  相似文献   

Erscheinungsbasierte statistische Objekterkennung     

Josef P?sl und Heinrich Niemann 《Informatik - Forschung und Entwicklung》2002,17(1):21-40

Zusammenfassung.   Die automatische Erkennung und Lokalisation von Objekten in digitalen Bildern ist ein wesentlicher Bestandteil vieler praktisch relevanter Anwendungen. In diesem Artikel wird ein erscheinungsbasiertes Verfahren zur Erkennung starrer zwei- oder dreidimensionaler Objekte vorgestellt, dem eine statistische Modellierung zugrundeliegt. Im Gegensatz zu segmentierungsbasierten Verfahren, wie sie vor allem im Bereich der 3D-Objekterkennung eingesetzt werden, erm?glicht der erscheinungsbasierte Ansatz aufgrund der Modellierung der Intensit?tswerte oder davon abgeleiteter lokaler Merkmale eines Bildes die Erkennung komplexer Objekte. Die statistische Formulierung der Problemstellung bildet den mathematischen Kontext zur Bestimmung optimaler L?sungen. Die Form der Modellierung erlaubt neben der Einzelobjekterkennung auch die Berücksichtigung von heterogenem Bildhintergrund und Mehrobjektszenen. Die dazu ben?tigten lokalen Merkmale entstehen durch r?umlich begrenzte Transformationen des Bildes, wie beispielsweise Gabor- oder Wavelet-Transformationen. Die statistische Modellierung beschreibt die Verteilung dieser lokalen Merkmale anhand einer Dichtefunktion, die sich bei der Hintergrund- und Mehrobjektmodellierung als Mischungsverteilung der Einzelobjektverteilungen ergibt. Die Aufgabenstellungen des Erlernens und Erkennens von Objekten sind damit als Parametersch?tzprobleme formal darstellbar. Dabei werden im einen Fall die Modellparameter und im anderen Fall die Lageparameter beziehungsweise die Klassen von Objekten gesch?tzt. Die experimentelle überprüfung des Ansatzes anhand realer Objektaufnahmen durch CCD-Kameras zeigt seine Brauchbarkeit zur Erkennung von 2D- und 3D-Objekten bei homogenem und heterogenem Hintergrund. Eingegangen am 5. April 2000 / Angenommen am 20. Juli 2001  相似文献   

Trained humans can exercise safely in extreme dry heat when drinking water ad libitum     

Nolte HW  Noakes TD  Van Vuuren B 《Journal of sports sciences》2011,29(12):1233-1241

  相似文献