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41.
Minerva - The postwar era is generally recognized as a unique moment of impetuous growth of the social sciences, due to the interest of Western internationalist elites in the development of a set... 相似文献
43.
Karate is a martial art that partly depends on subjective scoring of complex movements. Principal component analysis (PCA)-based methods can identify the fundamental synergies (principal movements) of motor system, providing a quantitative global analysis of technique. In this study, we aimed at describing the fundamental multi-joint synergies of a karate performance, under the hypothesis that the latter are skilldependent; estimate karateka’s experience level, expressed as years of practice. A motion capture system recorded traditional karate techniques of 10 professional and amateur karateka. At any time point, the 3D-coordinates of body markers produced posture vectors that were normalised, concatenated from all karateka and submitted to a first PCA. Five principal movements described both gross movement synergies and individual differences. A second PCA followed by linear regression estimated the years of practice using principal movements (eigenpostures and weighting curves) and centre of mass kinematics (error: 3.71 years; R2 = 0.91, P ? 0.001). Principal movements and eigenpostures varied among different karateka and as functions of experience. This approach provides a framework to develop visual tools for the analysis of motor synergies in karate, allowing to detect the multi-joint motor patterns that should be restored after an injury, or to be specifically trained to increase performance. 相似文献
44.
This paper focuses on assessing possible levers in the hands of a university’s top management team for inducing or managing change when faced with environmental drives. The topic is discussed after analysing change in a university over a 20-year period. The case study underlines the opportunities and difficulties of linking external environmental drives and change processes, highlighting the lack of a universal path and proposing elements that are worthy of attention. The paper underlines the need for top management teams in universities to pay particular attention to the systemic and balanced aspects of the factors determining change.
相似文献45.
Paolo Davoli Matteo Monari Kerstin Severinson Eklundh 《Education and Information Technologies》2009,14(3):229-254
The importance of groupware tools in e-learning practice is increasing, because of their educational relevance and of the
importance of group abilities in today’s job activities. The paper addresses some critical issues of asynchronous collaborative
tools hosted in Web-learning platforms. A model to capture user quality perceptions for these tools is presented, and an investigation
conducted in three case studies where e-learning platforms were used to share and comment on written works is reported in
detail. Quantitative and qualitative data are used in a complementary way to capture the complexity of educational collaborative
activities. The impact of technologies on work organization, writing and peer-feedback activities is discussed. Users dedicated
more time to feedback activities than they would have in real-life contexts, and paid more attention to the style and content
of their writing. Communication was more focused and honest than in real life (even though more distant and at the risk of
misunderstanding), and its indirectness encouraged shy and impaired people. Usability problems emerged from platform design,
educators’ choices and server-side settings; Web-based systems seem to pose specific usability issues when users are required
a strong active role; compatibility issues highlight the need for a closer Web standard compliance.
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| Kerstin Severinson EklundhEmail: |
46.
This paper investigates the determinants of economic growth from both a theoretical and an empirical perspective. The paper combines the supermultiplier model of growth with the Neo-Schumpeterian framework that emphasises the entrepreneurial role of the state. We aim to detect the macroeconomic effect generated by alternative fiscal policies: generic ones and more directed ‘mission-oriented’ ones. Using an SVAR model for the US economy for the 1947–2018 period, we show that mission-oriented policies produce a larger positive effect on GDP (fiscal multiplier) and on private investment in R&D (crowd-in effect) than the one generated by more generic public expenditures. 相似文献
47.
This paper proposes a strategic model for assessing the coherence between companies’ knowledge strategies and their business strategies as well as in their competitive and organisational contexts. In analysing knowledge management literature, we locate three principal strategies: (1) knowledge development (internal or external), (2) knowledge sharing (codification or personalisation) and (3) knowledge exploitation (internal or external). We then position the three strategies and six related policies in the context-content-process dimensions of Pettigrew's model to create a useful framework for strategic analysis and a model to assess the coherence of companies’ knowledge strategy. The model can be used to evaluate how an existing knowledge strategy aligns with a company's characteristics and to formulate and implement a coherent knowledge strategy based on the current competitive environment, organisational context and business strategy. 相似文献
48.
Nirit Gavish Teresa Gutiérrez Sabine Webel Jorge Rodríguez Matteo Peveri Uli Bockholt 《Interactive Learning Environments》2013,21(6):778-798
The current study evaluated the use of virtual reality (VR) and augmented reality (AR) platforms, developed within the scope of the SKILLS Integrated Project, for industrial maintenance and assembly (IMA) tasks training. VR and AR systems are now widely regarded as promising training platforms for complex and highly demanding IMA tasks. However, there is a need to empirically evaluate their efficiency and effectiveness compared to traditional training methods. Forty expert technicians were randomly assigned to four training groups in an electronic actuator assembly task: VR (training with the VR platform twice), Control-VR (watching a filmed demonstration twice), AR (training with the AR platform once), and Control-AR (training with the real actuator and the aid of a filmed demonstration once). A post-training test evaluated performance in the real task. Results demonstrate that, in general, the VR and AR training groups required longer training time compared to the Control-VR and Control-AR groups, respectively. There were fewer unsolved errors in the AR group compared to the Control-AR group, and no significant differences in final performance between the VR and Control-VR groups, probably due to a ceiling effect created by the use of two training trials in the selected task for participants who were expert technicians. The results suggest that use of the AR platform for training IMA tasks should be encouraged and use of the VR platform for that purpose should be further evaluated. 相似文献
49.
Three genes encoding for fungal cell wall degrading enzymes (CWDEs), ech42, nag70 and gluc78 from the biocontrol fungus Trichoderma atroviride were inserted into the binary vector pCAMBIA1305.2 singly and in all possible combinations and transformed to rice plants. More than 1800 independently regenerated plantlets in seven different populations (for each of the three genes and each of the four gene combinations) were obtained. The ech42 gene encoding for an endochitinase increased resistance to sheath blight caused by Rhizoctonia solani, while the exochitinase-encoding gene, nag70, had lesser effect. The expression level of endochitinase but exochitinase was correlated with disease resistance. Nevertheless, exochitinase enhanced the effect of endochitinase on disease resistance when the two genes co-expressed in transgenics. Resistance to Magnaporthe grisea was found in all kinds of regenerated plants including that with single gluc78. A few lines expressing either ech42 or nag70 gene were immune to the disease. Transgenic plants are being tested to further evaluate disease resistance at field level. This is the first report of multiple of expression of genes encoding CWDEs from Trichoderma atroviride that result in resistance to blast and sheath blight in rice. 相似文献
50.
Matteo Turri 《Journal of Further & Higher Education》2016,40(1):83-106
The evolution of Italian universities in terms of growth, economic sustainability and reforms can be interpreted in the light of the élite, mass and universal access categories defined by Martin Trow. The findings from this analysis show that although the number of enrolled students and funding problems propel the Italian university system towards the universal access stage, activities and functioning mechanisms are lagging far behind, since they are still involved in the transition from the élite to mass stage. Interpretation of the changes since 1980 on the basis of the New Public Management (NPM) paradigm and the notion of diversity allows identification of the reasons for this discrepancy as being mostly related to backwardness in terms of ideas and values rather than a lack of management techniques. 相似文献