The Teacher and the World     

Eduardo M. Duarte 《Educational Philosophy and Theory》2013,45(1):106-109

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A conceptual approach to secure electronic elections based on patterns     

Eduardo B. Fernandez  David L. La Red  José I. Peláez 《Government Information Quarterly》2013

Electoral processes are complex and need to be secure, reliable, and auditable. It is then important to define ways to evaluate their functional completeness and correction as well as their security and reliability. Many solutions to specific aspects of voting have been proposed but we do not know of any holistic view of this process. We present a unified approach to elections based on a conceptual model built using software patterns. A set of analysis patterns describe the structure and management of an election. The patterns describe voter registration, ballot structure, election day management, voting process, and the complete election. A conceptual model is built from the analysis patterns and defines precisely the functional properties of such a system together with its security requirements. The conceptual model is defined using UML diagrams that can be extended or complemented with formal methods to make the system verifiable. We show how to continue to the design phase for this system. While the model will not apply exactly to all elections it can be used as a reference architecture for voting applications and to show explicitly the security considerations for these kind of events. It can also be used for existing elections to verify that they have the required security provisions. The model can also be used as a reference for researchers to integrate their solutions in the complete process.  相似文献   

The Effects of Vertical Integration on the Release of New Films     

Claudio A. Agostini  Eduardo H. Saavedra 《Journal of Media Economics》2013,26(4):252-269

This article both theoretically and empirically addresses how a vertical structure in the motion pictures industry determines the number of prints a distributor releases of a new film. A simple theoretical model shows that the optimal number of copies is increasing on the expected demand for the film and the revenue share of the distributor and decreasing on the cost of each copy. The model also predicts that the optimal number of copies will decrease with the number of theaters that are vertically integrated with the distributor, as long as running a cinema requires financing a non-negligible cost of capital. The theoretical results are empirically tested using a very rich dataset of films' exhibition patterns in the major Chilean markets. The empirical results show that, on average, a non-integrated distributor releases 8 more copies than an integrated distributor.  相似文献   

Does formative feedback on search behaviour help students in answering comprehension questions from an available text? / ¿Ayuda la retroalimentación formativa sobre el comportamiento de búsqueda a contestar preguntas de comprensión en lecturas con texto disponible?     

Ana-Cristina Llorens  Eduardo Vidal-Abarca  Raquel Cerdán  Vicenta Ávila 《Infancia y Aprendizaje》2015,38(4):808-841

This study analyses the efficacy of formative feedback to boost students’ search behaviour when answering comprehension questions in a with-text reading situation, which is a common reading situation in instructional and assessment settings. In these reading situations search strategies play an important role to predict students’ performance. Sixty-five high school students read two texts and answered eight multiple-choice comprehension questions per text using the software Read&Answer, which recorded all the students’ actions. After answering each question, students received either global-search-feedback or specific-search-feedback, which differed in the specificity of their information, or no-feedback. Participants who received any feedback had a second chance to correct their wrong answers. Specific-search-feedback increased students’ search decisions and improved their use of relevant information to repair wrong answers over global-search-feedback. Consequently, specific-search-feedback improved students’ performance when they corrected wrong answers over global-search-feedback. These results have implications for the design and implementation of formative feedback in computer-based systems aimed at improving students’ performance and teaching reading literacy skills.  相似文献   

Vertical ground reaction force responses to different head-out aquatic exercises performed in water and on dry land     

Cristine Lima Alberton  Paula Finatto  Stephanie Santana Pinto  Amanda Haberland Antunes  Eduardo Lusa Cadore  Marcus Peikriszwili Tartaruga 《Journal of sports sciences》2015,33(8):795-805

The purpose was to analyse the vertical ground reaction forces (Fz) of head-out aquatic exercises [stationary running (SR), frontal kick (FK), cross-country skiing (CCS), jumping jacks (JJ), adductor hop (ADH) and abductor hop (ABH)] at two cadences in both aquatic and dry land environments. Twelve young women completed two sessions in each environment, each consisting of three exercises performed at two cadences (first and second ventilatory thresholds – C1 and C2, respectively). Two-way and three-way repeated measures analysis of variance were used to the statistical analysis. The results showed that the peak Fz and impulse were significantly lower in the aquatic environment, resulting in values from 28.2% to 58.5% and 60.4% to 72.8% from those obtained on dry land, respectively. In the aquatic environment, the peak Fz was lower and the impulse was higher at the C1 than at the C2. Furthermore, it was observed that SR and FK (0.9–1.1 BW) elicited a significantly higher peak Fz values compared to the ADH and JJ exercises (0.5–0.8 BW). It can be concluded that the aquatic environment reduces the Fz during head-out aquatic exercises. It should be noted that its magnitude is also dependent on the intensity and the identity of the exercise performed.  相似文献   

Intellectual development beyond formal operations     

Eduardo A. Castro†  Francisco M. Fernández† 《International Journal of Science Education》2013,35(4):441-447

Post‐formal operations as a stage of cognitive development beyond Piaget's formal operations state are discussed. It is argued that thinking abilities are of major importance for an adequate understanding of quantum‐mechanical and relativistic issues as they occur in modern science, especially physics. Some pedagogical consequences of the ‘fifth stage’ of cognitive development are discussed and proposals made about how post‐operational thinking abilities might be developed in students.  相似文献   

Sources of productivity growth in the Spanish pharmaceutical industry (1994-2000)   总被引：2，自引：0，他引：2  

Eduardo González  Fernando Gascón 《Research Policy》2004,33(5):735-745

The Spanish pharmaceutical industry underwent an important transformation during the 1990s. To survive under the new market conditions, labs had to refocus their competitive strategies towards increasing productive efficiency or reinforcing research and development (R&D) activities. This paper analyzes the evolution of the productive patterns in a sample of 80 pharmaceutical laboratories that operated in Spain from 1994 to 2000. We estimate Malmquist productivity indexes and decompose them into four sources of productivity change. The results suggest that pure technical efficiency change and the scale change of the technology explain most of the productivity growth observed during the period. The contribution of technical change to productivity growth is negligible, indicating a poor result from R&D activities at least in the groups of Small and Medium-sized labs.  相似文献   

Controllability of Volterra-Fredholm type systems in Banach spaces     

Eduardo Hernández M.  Donal O’Regan 《Journal of The Franklin Institute》2009,346(2):95-101

We show the results in Chalishajar [Controllability of mixed Volterra-Fredholm-type integro-differential systems in Banach space, J. Franklin Inst. 344(1) (2007) 12-21] and Chang and Chalishajar [Controllability of mixed Volterra-Fredholm type integro-differential systems in Banach space, J. Franklin Inst., doi:10.1016/j.jfranklin.2008.02.002] are only valid for ordinary differential control systems. As a result the examples provided cannot be recovered as applications of the abstract results.  相似文献   

La enseñanza de la Literatura en el ciclo 12–16     

Eduardo Aznar 《Cultura y Educación》2013,25(2):41-50

De la alfabetización a la competencia literaria media un tramo parecido al que va de la autoescuela a la participación en un rallye. Es obvio que la lectoescritura y la enseñanza de la literatura están relacionadas; pero reflexionar sobre esta relación y sobre la manera en que se ha enseñado, se enseña y se debe enseñar la literatura en la Reforma que viene, nos hace pasar de esa obviedad a un problema complejo en el que parece deseable una profunda renovación.  相似文献   

Special libraries and information centres in Brazil     

Eduardo J.W. Dias 《International Information and Library Review》2013,45(3):325-335

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