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Lluïsa Quevedo-Junyent José Antonio Aznar-Casanova Dolores Merindano-Encina Genís Cardona Joan Solé-Fortó 《Research quarterly for exercise and sport》2013,84(4):644-651
In this study, we examined differences in dynamic visual acuity between elite and subelite water polo players and sedentary students. To measure dynamic visual acuity binocularly, we asked participants to indicate the orientation of a broken ring, similar to the Landolt C, which increased in size as it moved across a computer screen. Two different speeds, three possible trajectories, and two different levels of contrast were evaluated. There were statistically significant differences between elite players and sedentary students for each combination of speed, contrast, and trajectory. Elite players achieved better dynamic visual acuity scores, and results also improved for some combinations of speed, contrast, and trajectory. Comparison between elite and subelite groups failed to reveal any 相似文献
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Frans Kaiser Jos B.J. Koelman Raymond J.G.M. Florax Frans A. van Vught 《Higher Education in Europe》1992,17(1):33-64
This article is an exercise in cross‐national comparative research on the financing of higher education, the countries involved being the EC countries. Before relevant comparisons could be made, agreement had to be reached as to what “higher education” is and what “students” are. It was then necessary to find some way of making accurate comparisons of monetary units and of dealing with contradictory ways in which educational statistics were and still are collected and collated. A research strategy was developed using existing sources, a specially developed questionnaire, and consultation with national experts. The results displayed biases for which corrections had to be made. They also, however, displayed a wide variety in the level of higher education expenditure in the EC countries. The project gave rise to the creation of the first comprehensive database that covers public expenditure on higher education in the twelve member states of the EC. It can be regarded as the first step in the creation of the “perfect database” on higher education expenditure which in turn would be a most valuable tool for higher education policy‐makers.
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Esperanza Marcos Belén Vela JoséMaría Cavero 《Informatik - Forschung und Entwicklung》2004,2(1):152-164
The most common way of designing databases is by means of a conceptual model, such as E/R, without taking into account other views of the system. New object-oriented design languages, such as UML (Unified Modelling Language), allow the whole system, including the database schema, to be modelled in a uniform way. Moreover, as UML is an extendable language, it allows for any necessary introduction of new stereotypes for specific applications. Proposals exist to extend UML with stereotypes for database design but, unfortunately, they are focused on relational databases. However, new applications require complex objects to be represented in complex relationships, object-relational databases being more appropriate for these requirements. The framework of this paper is an Object-Relational Database Design Methodology, which defines new UML stereotypes for Object-Relational Database Design and proposes some guidelines to translate a UML conceptual schema into an object-relational schema. The guidelines are based on the SQL: 1999 object-relational model and on Oracle8i as a product example. 相似文献
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