Determination of the centre of mass kinematics in alpine skiing using differential global navigation satellite systems     

Matthias Gilgien  Jörg Spörri  Julien Chardonnens  Josef Kröll  Philippe Limpach  Erich Müller 《Journal of sports sciences》2015,33(9):960-969

In the sport of alpine skiing, knowledge about the centre of mass (CoM) kinematics (i.e. position, velocity and acceleration) is essential to better understand both performance and injury. This study proposes a global navigation satellite system (GNSS)-based method to measure CoM kinematics without restriction of capture volume and with reasonable set-up and processing requirements. It combines the GNSS antenna position, terrain data and the accelerations acting on the skier in order to approximate the CoM location, velocity and acceleration. The validity of the method was assessed against a reference system (video-based 3D kinematics) over 12 turn cycles on a giant slalom skiing course. The mean (± s) position, velocity and acceleration differences between the CoM obtained from the GNSS and the reference system were 9 ± 12 cm, 0.08 ± 0.19 m · s^-1 and 0.22 ± 1.28 m · s^-2, respectively. The velocity and acceleration differences obtained were smaller than typical differences between the measures of several skiers on the same course observed in the literature, while the position differences were slightly larger than its discriminative meaningful change. The proposed method can therefore be interpreted to be technically valid and adequate for a variety of biomechanical research questions in the field of alpine skiing with certain limitations regarding position.  相似文献   

Separation of platelets from other blood cells in continuous-flow by dielectrophoresis field-flow-fractionation     

Piacentini N  Mernier G  Tornay R  Renaud P 《Biomicrofluidics》2011,5(3):34122-341228

We present a microfluidic device capable of separating platelets from other blood cells in continuous flow using dielectrophoresis field-flow-fractionation. The use of hydrodynamic focusing in combination with the application of a dielectrophoretic force allows the separation of platelets from red blood cells due to their size difference. The theoretical cell trajectory has been calculated by numerical simulations of the electrical field and flow speed, and is in agreement with the experimental results. The proposed device uses the so-called "liquid electrodes" design and can be used with low applied voltages, as low as 10 V(pp). The obtained separation is very efficient, the device being able to achieve a very high purity of platelets of 98.8% with less than 2% cell loss. Its low-voltage operation makes it particularly suitable for point-of-care applications. It could further be used for the separation of other cell types based on their size difference, as well as in combination with other sorting techniques to separate multiple cell populations from each other.  相似文献   

Compétences,habitus et savoirs professionnels     

Philippe Perrenoud 《欧洲师范教育杂志》1994,17(1-2):45-48

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Public Sector Research: A Growing Role in Innovation Systems   总被引：3，自引：0，他引：3  

Larédo  Philippe  Mustar  Philippe 《Minerva》2004,42(1):11-27

This essay highlights three converging trendsexperienced by `public sector research' duringthe past decade. Looking especially at France,our discussion draws attention to the new rolesof universities, the blurring of relationshipsbetween types of research institutions andresearch activities, and the development of`research collectives' as an organizationalfeature now emerging throughout Europe.  相似文献   

Instructional Goals: determination and specification     

Philippe Duchastel  Michael Steve 《British journal of educational technology : journal of the Council for Educational Technology》1983,14(2):137-142

This paper develops the argument that the form in which instructional goals are specified should depend on the nature of the knowledge underlying the particular instruction being developed. It examines the two central issues of goal determination (how goals are derived) and goal specification (how they should be represented) in order to counter the assumption that one type of goal formulation (be it via behavioural objectives, work models, or cognitive objectives) is optimal for instruction.  相似文献   

Autopsy-Based Learning is Essential But Underutilized in Medical Education: A Questionnaire Study     

Lasse Pakanen  Julius Tikka  Paula Kuvaja  Philippe Lunetta 《Anatomical sciences education》2022,15(2):341-351

To this day, autopsies and dissections have been essential in medical education, but declining autopsy numbers have endangered this long-standing tradition. Students' perceptions of these teaching methods should be constantly updated to help educators understand how to achieve their teaching goals. The purpose of this study was to explore the state of autopsy- and dissection-based teaching in two Finnish universities based on the experiences of the students, survey their perceptions of such teaching, and to compare the Finnish situation with students' perceptions in other countries as it emerges from medical literature. A questionnaire went to 859 second-, fourth-, and sixth-year medical students. The questions concerned dissection and autopsy classes these students had attended, the views of the students in regard to the number of classes, and the benefits of and attitudes towards autopsy teaching. An open question of how to improve autopsy teaching was included. The response rate was 19.4%. Most respondents requested more autopsy and dissection classes, especially practical education. They found autopsies most beneficial in learning anatomy and dealing with one's own emotions related to death. Their experiences proved least beneficial for interaction with the relatives of a deceased patient and for people skills. Integrational methods and focusing on the main learning outcomes were suggested as improvements. Overall, students found dissection and autopsy teaching important, but felt concerned about the diminishing autopsy numbers. Focusing on main learning objectives and better integration of autopsies in the teaching of different specialties could help to utilize autopsies to a greater extent.  相似文献   

Analysis of a multifaceted interactive pedagogy program in an upper limb anatomy course: A time series study     

Alexandre Bellier  Noémie Kaladzé  Pierre-Yves Rabattu  Philippe C. Chaffanjon  Guillaume Cavalié 《Anatomical sciences education》2023,16(1):116-127

Many new methods have contributed to the learning of anatomy, including several interactive methods, increasing the effectiveness of educational programs. The effectiveness of an educational program involving several interactive learning methods such as problem-based learning and reciprocal peer teaching was researched in this study. A quasi-experimental before–after study on three consecutive groups of second-year students at the Grenoble School of Medicine was conducted. The lectures were replaced by an educational program based on the problem-based learning method and reciprocal peer teaching. The first session was dedicated to reading clinical cases illustrating the medical concept, so that the learning objectives for the second session could be set. Then, after viewing digital courses, the second session was dedicated to a synthetic presentation by the students themselves, followed by an interactive summary with the teacher. The analysis of 630 students showed a significant increase in the theory test results for those who took part in the intervention: 9.71 versus 9.19 (β = 0.57, P = 0.036). Moreover, satisfaction was high after the intervention (mean = 4.5/5), and when comparing the two pedagogical approaches the students showed a clear preference for the program implemented with the concepts highlighted such as interactivity, in-depth work, group work, and autonomy. A multifaceted interactive pedagogy program could have a significant impact on the results of the theoretical concepts presented and on satisfaction as well as increased investment by students in learning anatomy.  相似文献   

Research on illustrations in text: Issues and perspectives     

Philippe C. Duchastel 《Educational technology research and development : ETR & D》1980,28(4):283-287

So many studies have failed to show significant effects for illustrations in texts and teaching materials that, the author remarks, if the research is taken at face value, it is not difficult to begin believing that illustrations really are not very important in assisting learning. However, he concludes, their value has been confirmed by a sufficient number of studies to support intuitive beliefs and researchers now must move on, using new frameworks to study the reasons illustrations can aid learning.  相似文献   

“Compulsory Schooling” Despite the Law: How Education Policy Underpins the Widespread Ignorance of the Right to Home Educate in France     

Philippe Bongrand 《Journal of School Choice》2016,10(3):320-329

ABSTRACT

Everyone in France takes for granted the existence of compulsory school attendance (“école obligatoire”) while home education remains very exceptional. Yet school attendance is not, and has never been, legally compulsory in France. How can one explain the fact that the right to home educate is little known and practiced? This article researches how public policies may foster this widespread ignorance. Drawing mainly on archival records of French Parliament debates about compulsory instruction in 1882, 1936, and 1998, it depicts various ways for lawmakers to contribute to this ignorance.  相似文献   

Universities’ Autonomy in Times of Changing Higher Education Governance: A study of the Swiss academic labour market     

Lukas Baschung  Gaële Goastellec  Jean‐Philippe Leresche 《Tertiary Education and Management》2013,19(1):51-64

Although eternally debated, the issue of autonomy in higher education is rarely analysed in its complexity. To address this issue, this article uses an analytical matrix which combines the distinction between substantive and procedural autonomy and the distinction between HEI governing bodies, academic professions and individual academics. This framework allows for analysing—by the example of the Swiss academic labour market—how changes in national steering can lead to the redistribution of autonomy between the mentioned actors. Further insights relate to the observed higher education system’s decentralised character. Empirical findings—based on the examination of three special programmes initiated by the federal government—indicate that HEI actors lose some substantive autonomy in favour of the Confederation, and—against the general tendency induced by New Public Management to reinforce HEI governing bodies—procedural autonomy is rather redistributed to individual academics and academic professions.  相似文献