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Ilkka Niiniluoto 《Metascience》2011,20(3):549-552
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Neil Edward Bezodis Aki Ilkka Tapio Salo Grant Trewartha 《Journal of sports sciences》2013,31(8):738-746
AbstractThis study analysed the first stance phase joint kinetics of three elite sprinters to improve the understanding of technique and investigate how individual differences in technique could influence the resulting levels of performance. Force (1000 Hz) and video (200 Hz) data were collected and resultant moments, power and work at the stance leg metatarsal-phalangeal (MTP), ankle, knee and hip joints were calculated. The MTP and ankle joints both exhibited resultant plantarflexor moments throughout stance. Whilst the ankle joint generated up to four times more energy than it absorbed, the MTP joint was primarily an energy absorber. Knee extensor resultant moments and power were produced throughout the majority of stance, and the best-performing sprinter generated double and four times the amount of knee joint energy compared to the other two sprinters. The hip joint extended throughout stance. Positive hip extensor energy was generated during early stance before energy was absorbed at the hip as the resultant moment became flexor-dominant towards toe-off. The generation of energy at the ankle appears to be of greater importance than in later phases of a sprint, whilst knee joint energy generation may be vital for early acceleration and is potentially facilitated by favourable kinematics at touchdown. 相似文献
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Climate change is a complex environmental problem that can be used to examine students’ understanding, gained through classroom communication, of climate change and its interactions. The present study examines a series of four science sessions given to a group of primary school student teachers (n?=?20). This includes analysis of the communication styles used and the students’ pre- and post-conceptualisation of climate change based on results obtained via essay writing and drawings. The essays and drawings concerned the students’ unprompted pre- and post-conceptions about climate change, collected before and after each of the four inquiry-based science sessions (in physics, chemistry, biology and geography). Concept mapping was used in the analysis of the students’ responses. The communication used in the four sessions was analysed with a communicative approach in order to find out the discussion about climate change between teacher and students. The analyses indicated that the students did not have the knowledge or the courage to participate in discussion, but post-conceptualisation map showed that students’ thinking had become more coherent after the four sessions. Given the results of the present study, proposals for using concepts maps and/or communication analysis in studying students’ conceptions are presented. 相似文献
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Ilkka Tuomi 《European Journal of Education》2013,48(1):58-78
The extremely rapid expansion of open educational resource (OER) initiatives and the millions of learners they attract can be understood as an indicator of an emerging revolution in education and learning. This article describes recent developments in this area and develops conceptual foundations for studies and policies on OER. We describe four different types of OER, locate these in a field of learning theories, and discuss how the wide adoption of OER may constrain and accelerate the transformation of learning and education in the knowledge society. 相似文献
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Ilkka Kauppinen 《British Journal of Sociology of Education》2015,36(2):336-353
This article draws attention to the relative lack of theoretically and methodologically elaborated approaches to understand and explain the complex relations between transnationalization of higher education and globalization seen especially from the point of view of global capitalism. The main aim of this article is to contribute to the construction of a theory of transnational academic capitalism (TAC). A theory of TAC argues that those networks, practices and activities that are blurring the boundaries between higher education, markets and states are increasingly becoming transnational without supposing that this transformation implies that local and national levels are insignificant in studying TAC. In this respect, focus is especially on methodological starting points of a theory of TAC. It is argued that a theory of TAC should be based on sociological relationalism and qualified methodological transnationalism. 相似文献
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We apply the knowledge discovery process to the mapping of current topics in a particular field of science. We are interested in how articles form clusters and what are the contents of the found clusters. A framework involving web scraping, keyword extraction, dimensionality reduction and clustering using the diffusion map algorithm is presented. We use publicly available information about articles in high-impact journals. The method should be of use to practitioners or scientists who want to overview recent research in a field of science. As a case study, we map the topics in data mining literature in the year 2011. 相似文献
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Neil Edward Bezodis Grant Trewartha Aki Ilkka Tapio Salo 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(2):232-245
This study determined the effects of simulated technique manipulations on early acceleration performance. A planar seven-segment angle-driven model was developed and quantitatively evaluated based on the agreement of its output to empirical data from an international-level male sprinter (100 m personal best = 10.28 s). The model was then applied to independently assess the effects of manipulating touchdown distance (horizontal distance between the foot and centre of mass) and range of ankle joint dorsiflexion during early stance on horizontal external power production during stance. The model matched the empirical data with a mean difference of 5.2%. When the foot was placed progressively further forward at touchdown, horizontal power production continually reduced. When the foot was placed further back, power production initially increased (a peak increase of 0.7% occurred at 0.02 m further back) but decreased as the foot continued to touchdown further back. When the range of dorsiflexion during early stance was reduced, exponential increases in performance were observed. Increasing negative touchdown distance directs the ground reaction force more horizontally; however, a limit to the associated performance benefit exists. Reducing dorsiflexion, which required achievable increases in the peak ankle plantar flexor moment, appears potentially beneficial for improving early acceleration performance. 相似文献
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Ilkka Kauppinen 《Globalisation, Societies & Education》2013,11(1):1-22
This article is based on the idea that if we are witnessing an on-going shift towards the transnational phase of capitalism, this objective structural change should also be taken into account in higher education studies. In this sense, this article reflects the increased scholarly attention into the relationship between globalisation and higher education since the 1990s. The main purpose of this article is to contribute to these discussions by developing dialogue between global capitalism theories and the theory of academic capitalism. In order to achieve this, William Robinson's concept of the transnational capitalist class (TCC) will be amended to include also the informational fraction. Furthermore, the causal history of TRIPS (Agreement on Trade-Related Aspects of Intellectual Property Rights) will be used as an illustrative example of how transnational corporations have stimulated the emergence of academic capitalism at transnational level. First, I will discuss the theory of academic capitalism. Second, I will introduce and amend the concept of the TCC. Third, I will present my conclusions. 相似文献
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A video abstract of this article can be viewed at http://www.youtube.com/watch?v=3FvyP1egxw0&feature=player_embedded 相似文献