Physical and perceptual-cognitive demands of top-class refereeing in association football     

Helsen W  Bultynck JB 《Journal of sports sciences》2004,22(2):179-189

The aim of this study was to examine the physical and perceptual-cognitive demands imposed on UEFA top-class referees and assistant referees during the final round of the Euro 2000 Championship. To investigate the physical workload, the heart rates during matches were monitored by short-range radio telemetry and translated to different workloads expressed as a percentage of maximal heart rate. For measurement of the perceptual-cognitive workload, video-recordings of games were used to obtain the average number of observable decisions taken by a referee. On average, referees and assistant referees performed the matches at 85 +/- 5% and 77 +/- 7% of their maximal heart rate, respectively. Over the 31 games, the mean number of observable decisions was 137 (range 104-162), 64% of which were based on communication with the assistant referees and/or the fourth official. To optimize the physical preparation of top-class match officials, the results of this study support the application of intensive and intermittent training sessions, which should place priority on high-intensity aerobic stimuli. In addition, video training is discussed as an additional method for improving match officials' decision making.  相似文献   

Protective Factors for School Readiness Among Children in Poverty     

Matthew R. Holliday  Adriana Cimetta  Christina A. Cutshaw  David Yaden  Ronald W. Marx 《Journal of Education for Students Placed at Risk》2014,19(3-4):125-147

The economic status of families and their children's learning outcomes are closely related. For example, children living in poverty tend to score worse on measures of reading and math performance than their more affluent peers, and this achievement gap is present by kindergarten. In this study, we identified protective factors associated with school readiness among an Arizona sample of children living at or below the federal poverty line (N = 230). Using multiple linear regression, we examined the association between assessments of school readiness, health status, childcare hours, home language, parent engagement, and parent education. We found that increased weekly childcare hours and better health were associated with higher proficiency in math, literacy, and approaches to learning, and may serve as resilience factors for children in poverty that may contribute to closing the achievement gap.  相似文献   

Positionierungen zu „Elite“ und „Exzellenz“ in gymnasialen Bildungsregionen – Eine „Gretchenfrage“ für Schulleiter exklusiver Gymnasien?     

Werner Helsper  Mareke Niemann  Anja Gibson  Lena Dreier 《Zeitschrift für Erziehungswissenschaft》2014,17(3):203-219

Looking at two urban higher education regions, in this paper we investigate the question of which positions head teachers of “exclusive” German gymnasiums adopt with regard to concepts such as ‘elite’, ‘excellence’ and thus also to schools’ attempts to distinguish their own profiles in the education system, all the while bearing in mind the context of public discourses about ‘elite’ and ‘excellence’. In doing so, we reconstruct four modes of dealing with the elite concept. All of these modes—even the most positive references—show that for “exclusive” German Gymnasiums the term ‘elite’ is precariously situated, associated as it is with a considerable need for legitimation. By contrast, it is not problematic to refer to a meritocratic elite concept that involves functional academic and leadership elites in the sense of excellence. On the other hand, any association of these upper secondary schools with power, financial and business elites does seem highly problematic and is vehemently rejected. This clear rejection occurs—and this is the central thesis of this article—because otherwise meritocracy itself, as the hegemonic academic form of legitimation, would be threatened to its very core.  相似文献   

Fault detection,isolation and estimation for Takagi–Sugeno nonlinear systems     

Dalil Ichalal  Benoît Marx  José Ragot  Didier Maquin 《Journal of The Franklin Institute》2014

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Robuste Indizes für Projection Pursuit     

Tobias Rohatsch  Gerhard P?ppel und Heinrich Werner 《Informatik - Forschung und Entwicklung》2002,17(2):53-59

Zusammenfassung.   Die moderne und hoch komplexe Fertigung, z.B. in der Halbleiterindustrie, erfordert für die dabei anfallenden Messdaten der Anlagen- bzw. Prozessparameter multivariate Analysemethoden. Eine dieser m?glichen Analysemethoden ist Projection Pursuit (PP). Dieses Verfahren ist durch geschickte Wahl des so genannten Projektionsindex in der Lage, verschiedenste Datencharakteristika zu detektieren und diese auf anschauliche Weise zu visualisieren. Bei den Projektionsindizes handelt es sich um Funktionen, die eine Projektion auf unterschiedliche Merkmale hin bewerten und dabei jeder Projektion einen Funktionswert zuweisen. Dieser Funktionswert spiegelt die Aussagekraft der Projektion (in Abh?ngigkeit vom verwendeten Index) wider. Die Auswahl bzw. der Aufbau dieser Indizes ist hierbei von entscheidender Bedeutung. Alle hier vorgestellten Indizes zeichnen sich vor allem durch ihren robusten Charakter gegenüber durch Ausrei?er kontaminierte Daten, wie sie in realen Datenszenarien vorkommen, aus. Die durch Anwendung dieser Indizes gewonnenen Einblicke in die komplexe Struktur der Daten erm?glichen es, hochdimensionale Parameterabweichungen und komplexe Zusammenh?nge innerhalb der Daten zu finden. Eingegangen am 11. Februar 2002 / Angenommen am 14. Mai 2002  相似文献   

Semantic structures of one-step word problems involving multiplication or division     

Siegbert Smidt  Werner Weiser 《Educational Studies in Mathematics》1995,28(1):55-72

From classifications of word problems in international discussion of elementary mathematics instruction as well as from conceptual elaborations of didactical analyses in Germany, a classification of semantic structures of one-step word problems involving multiplication or division is proposed, comprehending four main classes: Forming the n-th multiple of measurers, combinatorial multiplication, composition of operators, and multiplication by formula. This classification is more comprehensive and differentiated than the classifications of Vergnaud (1983), Nesher (1988), and Bellet al. (1989) — aiming at a better assignment between diverse contextual circumstances and conceptual demands of mathematics and at compatibility with the well-known semantic structures of addition and subtraction word problems.  相似文献   

Book reviews     

J. K. Lindsey  Arthur W. Foshay  W. D. Halls  Sid Bourke  R. Murray Thomas  Michael J. McRory  J. Keith Watson  M. K. Raina  David Phillips  S. Anandalakshmy  Klaus Künzel  Hans Werner Heymann  Edmund King  Ronald Taft 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》1982,28(3):377-399

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Performance of students in project‐based science classrooms on a national measure of science achievement     

Rebecca M. Schneider  Joseph Krajcik  Ronald W. Marx  Elliot Soloway 《科学教学研究杂志》2002,39(5):410-422

Reform efforts in science education emphasize the importance of supporting students' construction of knowledge through inquiry. Project‐based science (PBS) is an ambitious approach to science instruction that addresses concerns of reformers. A sample of 142 10th‐ and 11th‐grade students enrolled in a PBS program completed the 12th‐grade 1996 National Assessment of Educational Progress (NAEP) science test. Compared with subgroups identified by NAEP that most closely matched our student sample, White and middle class, PBS students outscored the national sample on 44% of NAEP test items. This study shows that students participating in a PBS curriculum were prepared for this type of testing. Educators should be encouraged to use inquiry‐based approaches such as PBS to implement reform in their schools. © 2002 Wiley Periodicals, Inc. J Res Sci Teach 39: 410–422, 2002  相似文献   

Exploring student study behaviours in engineering: how undergraduates prepared textbook problems for online submission     

Angela Minichiello  Sherry Marx  Laurie McNeill  Christine Hailey 《European Journal of Engineering Education》2019,44(1-2):253-270

ABSTRACT

While textbooks serve as a primary source of content material and problem-solving practice for undergraduates in engineering, studies that investigate how engineering students prepare assignments based on textbook problems are limited. To examine how engineering students complete textbook-based assignments outside of class, this exploratory qualitative study retrospectively investigated the study behaviours of six undergraduates enrolled in a required, second-year undergraduate engineering course at a mid-size, public university in the western United States. Within the course, students solved textbook problems and electronically submitted problem answers for graded credit. Findings from in-depth, semi-structured interviews showed that students identified and used a variety of non-traditional and unsupported resources in personalised approaches to preparing assignments. Resource choice and use was affected by students’ preferences for timely support, convenience, and social connections. The online submission process seemed to influence students’ adoption of study behaviours and resources considered less effective for deep, conceptual learning.  相似文献   

Classical conditioning of vocalizations in the rat: Acoustic characteristics of the CR and UCR     

Werner Nitschke 《Learning & behavior》1979,7(4):457-460

Classically conditioned shock-elicited vocalizations in the adult rat were acoustically analyzed and described, The fundamental frequency of the CRs ranged between 2,000 and 3,600 Hz, with overtones that extended well into the ultrasonic range and with durations lasting approximately 1÷2 sec. Major differences between CR and UCR signals were apparent. The CR vocalizations had little frequency variation and little or no noise, while the UCR vocalizations were associated with highly irregular frequencies and broad-band noise. Post-shock vocalizations had combined features of the CR and UCR sounds. It is suggested that the differences between the CR and UCR are related to the CR being the emotional cry and the UCR the pain cry.  相似文献