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31.
Most of the Peer-to-Peer search techniques proposed in the recent years have focused on the single-key retrieval. However, similarity search in metric spaces represents an important paradigm for content-based retrieval in many applications. In this paper we introduce an extension of the well-known Content-Addressable Network paradigm to support storage and retrieval of more generic metric space objects. In particular we address the problem of executing the nearest neighbors queries, and propose three different algorithms of query execution. An extensive experimental study on real-life data sets explores the performance characteristics of the proposed algorithms by showing their advantages and disadvantages. 相似文献
32.
Anderson Souza Oliveira Rogério Bulhões Corvino Fabrizio Caputo Per Aagaard 《European Journal of Sport Science》2016,16(2):199-205
This study examined whether short-term maximal resistance training employing fast-velocity eccentric knee extensor actions would induce improvements in maximal isometric torque and rate of force development (RFD) at early (<100 ms) and late phases (>100 ms) of rising torque. Twenty healthy men were assigned to two experimental groups: eccentric resistance training (TG) or control (CG). Participants on the TG trained three days a week for a total of eight weeks. Training consisted of maximal unilateral eccentric knee extensors actions performed at 180°s-1. Maximal isometric knee extensor torque (MVC) and incremental RFD in successive 50 ms time-windows from the onset contraction were analysed in absolute terms (RFDINC) or when normalised relative to MVC (RFDREL). After eight weeks, TG demonstrated increases in MVC (28%), RFDINC (0–50 ms: 30%; 50–100 ms: 31%) and RFDREL (0–50 ms: 29%; 50–100 ms: 32%). Moreover, no changes in the late phase of incremental RFD were observed in TG. No changes were found in the CG. In summary, we have demonstrated, in active individuals, that a short period of resistance training performed with eccentric fast-velocity isokinetic muscle contractions is able to enhance RFDINC and RFDREL obtained at the early phase of rising joint torque. 相似文献
33.
Vito N. Silvestri 《Communication quarterly》2013,61(2):42-43
Interfacing communication and propaganda Jacques Ellul, Propaganda, New York, Alfred A. Knopf, Inc., 1966 Joe McGinniss, The Selling of the President 1968, New York, Trident Press, 1969 George A. Miller, The Psychology of Communication, Seven Essays, New York, Basic Books, Inc., 1967 Alfred G. Smith, Communication and Culture, New York, Holt, Rinehart and Winston, Inc., 1966 Raymond G. Smith, Speech Communication: Theory and Models, New York, Harper and Row, Inc., 1970. 相似文献
34.
Daniele Broccolo Lorenzo Marcon Franco Maria Nardini Raffaele Perego Fabrizio Silvestri 《Information processing & management》2012
This paper proposes an efficient and effective solution to the problem of choosing the queries to suggest to web search engine users in order to help them in rapidly satisfying their information needs. By exploiting a weak function for assessing the similarity between the current query and the knowledge base built from historical users’ sessions, we re-conduct the suggestion generation phase to the processing of a full-text query over an inverted index. The resulting query recommendation technique is very efficient and scalable, and is less affected by the data-sparsity problem than most state-of-the-art proposals. Thus, it is particularly effective in generating suggestions for rare queries occurring in the long tail of the query popularity distribution. The quality of suggestions generated is assessed by evaluating the effectiveness in forecasting the users’ behavior recorded in historical query logs, and on the basis of the results of a reproducible user study conducted on publicly-available, human-assessed data. The experimental evaluation conducted shows that our proposal remarkably outperforms two other state-of-the-art solutions, and that it can generate useful suggestions even for rare and never seen queries. 相似文献
35.
Céline Darnon Fabrizio Butera Gabriel Mugny Alain Quiamzade Chris S. Hulleman 《European Journal of Psychology of Education - EJPE》2009,24(4):423-434
Classroom research on achievement goals has revealed that performance-approach goals (goals to outperform others) positively
predict exam performance whereas performance-avoidance goals (goals not to perform more poorly than others) negatively predict
it. Because prior classroom research has primarily utilized multiple-choice exam performance, the first aim of the present
study was to extend these findings to a different measure of exam performance (oral examination). The second aim of this research
was to test the mediating role of perceived difficulty. Participants were 49 4th year psychology students of the University
of Geneva. Participants answered a questionnaire assessing their level of performance-approach and performance-avoidance goal
endorsement in one of their classes as well as the perceived difficulty of this class for themselves. Results indicated that
performance-approach goals significantly and positively predicted exam grades. Performance-avoidance goals significantly and
negatively predicted grades. Both of these relationships were mediated by the perceived difficulty of the class for oneself.
Thus, the links previously observed between performance goals and exam performance were replicated on an oral exam. Perceived
difficulty is discussed as a key dimension responsible for these findings. 相似文献
36.
Most of the peer-to-peer search techniques proposed in the recent years have focused on the single-key retrieval. However, similarity search in metric spaces represents an important paradigm for content-based retrieval in many applications. In this paper we introduce an extension of the well-known Content-Addressable Network paradigm to support storage and retrieval of more generic metric space objects. In particular we address the problem of executing the nearest neighbors queries, and propose three different algorithms of query propagation. An extensive experimental study on real-life data sets explores the performance characteristics of the proposed algorithms by showing their advantages and disadvantages. 相似文献
37.
Daniele Conte Mitchell Robert Smith Fabrizio Santolamazza Terence Girard Favero Antonio Tessitore Aaron Coutts 《Journal of sports sciences》2019,37(11):1205-1211
This study aimed to assess the reliability, usefulness and construct validity of the newly developed Combined Basketball Skill Test (CBST). Fifteen recreational (age = 22.8 ± 4.2 y, stature = 184.8 ± 6.5 cm, body mass = 81.6 ± 9.6 kg, training experience = 9.8 ± 5.3 y) and fifteen semiprofessional (age = 18.9 ± 3.3 y, stature = 190.5 ± 8.1 cm, body mass = 84.2 ± 11.2 kg, training experience = 11.1 ± 3.5 y) players volunteered to participate in this study. Test–retest reliability and usefulness were examined for recreational players, while construct validity was evaluated comparing the two player groups. The CBST is composed of 12 trials and its outcome measures include: completion time (sum of the 12 trial times); penalty time (sum of the times from the 12 trials); performance time (completion time + penalty time) and total number of errors. Relative reliability analysis showed acceptable ICC values (i.e. ≥0.70) in all the studied variables. Absolute reliability analysis showed a CV < 5% for completion (1.6%) and performance (2.0%) time, while a CV >5% is reported for the remaining variables. The usefulness of the test was considered “Marginal” and “Good” when comparing TE values with SWC02 and SWC05, respectively for all the studied variables. Likely and very likely differences were shown between recreational and semiprofessional players in all investigated variables. Results showed that the CBST is reliable, useful to detect moderate changes and valid to assess basketball skills. 相似文献
38.
Fabrizio Benente 《Al-Masaq: Islam & the Medieval Mediterranean》2018,30(2):148-165
This article examines a set of lustreware pottery discovered in the fill of the tower belonging to the Genoese family, the Embriaci. The finds are datable to the mid-thirteenth century, characterised by decorative patterns which are atypical in lustreware production in al-Andalus, though some comparisons can be drawn with the decorative patterns of the “vasos de la Alhambra” and the pottery known as “nazarí primitive”. The context of the discovery in Genoa will briefly be outlined, including the story of the family settlement (Part 1), the stratigraphic sequence (Part 2), and the stylistic connections to other pottery characterising it (Part 3). The formal and decorative elements characterising the lustreware pottery found in the Embriaci Tower will then be examined and compared (Part 4) with finds from the Upper Tyrrhenian region (Provence, Savona, Pisa). Part 5 will suggest that the finds are a specific type of decorated lustreware produced in the thirteenth century in al-Andalus (Murcia, Málaga and Almería). The concluding part (Part 6) will investigate the meaning of the presence of the set of imported ceramics in the “curia” of the Embriaci family in Genoa.
This type of pottery has only been discovered hitherto in excavation finds and architectural contexts (the so called “bacini”) in Italy and France. The identification of decorative and formal elements characterising this “group” of pottery will allow the identification of examples of this production outside of Italy and France. The publication of the findings will provide new data to develop an archaeological overview of commercial contacts between al-Andalus and the Tyrrhenian area (Provence, Liguria, Tuscany) during the thirteenth century. 相似文献
39.
Philippos Pouyioutas Emilios Solomou Christina Ioannou Fabrizio Boldini Maria Rita Bracchini 《美中教育评论》2010,7(6):92-100
This paper presents the EUCLIDES （Enhancing the Use of Cooperative Learning to Increase Development of Science Studies） project （134246-LLP-1-2007-1-IT-1-COMENIUS-CMP）, which aims at introducing and pilot-testing an innovative teaching and training methodology, based on the constructivist approach and on problem-based learning （PBL）, through the use of information communication technology （ICT） instruments. This methodology has been developed for the study of science subjects and, is currently used in some European schools of secondary education, involving teachers and students. A moodle platform has been developed to enforce the application and use of the methodology. Through this platform, teachers can monitor the progress of the work of the students and intervene as facilitators when it is necessary to provide further co-ordination, pose questions and suggest problem-based approaches. The use of the platform secures that the teachers remain distant from the students allowing students to work by themselves and find solutions to the problems posed. 相似文献
40.
Fabrizio Falchi Claudio Lucchese Salvatore Orlando Raffaele Perego Fausto Rabitti 《Information processing & management》2012
Feature-rich data, such as audio-video recordings, digital images, and results of scientific experiments, nowadays constitute the largest fraction of the massive data sets produced daily in the e-society. Content-based similarity search systems working on such data collections are rapidly growing in importance. Unfortunately, similarity search is in general very expensive and hardly scalable. 相似文献