TournaRank: When retrieval becomes document competition     

Gilles Hubert  Yoann Pitarch  Karen Pinel-Sauvagnat  Ronan Tournier  Léa Laporte 《Information processing & management》2018,54(2):252-272

Numerous feature-based models have been recently proposed by the information retrieval community. The capability of features to express different relevance facets (query- or document-dependent) can explain such a success story. Such models are most of the time supervised, thus requiring a learning phase. To leverage the advantages of feature-based representations of documents, we propose TournaRank, an unsupervised approach inspired by real-life game and sport competition principles. Documents compete against each other in tournaments using features as evidences of relevance. Tournaments are modeled as a sequence of matches, which involve pairs of documents playing in turn their features. Once a tournament is ended, documents are ranked according to their number of won matches during the tournament. This principle is generic since it can be applied to any collection type. It also provides great flexibility since different alternatives can be considered by changing the tournament type, the match rules, the feature set, or the strategies adopted by documents during matches. TournaRank was experimented on several collections to evaluate our model in different contexts and to compare it with related approaches such as Learning To Rank and fusion ones: the TREC Robust2004 collection for homogeneous documents, the TREC Web2014 (ClueWeb12) collection for heterogeneous web documents, and the LETOR3.0 collection for comparison with supervised feature-based models.  相似文献   

Effect of physiological harvest stages on the composition of bioactive compounds in Cavendish bananas   总被引：1，自引：0，他引：1  

Christelle Bruno Bonnet  Olivier Hubert  Didier Mbeguie-A-Mbeguie  Dominique Pallet  Abel Hiol  Max Reynes  Patrick Poucheret 《Journal of Zhejiang University. Science. B》2013,14(4):270-278

The combined influence of maturation, ripening, and climate on the profile of bioactive compounds was studied in banana (Musa acuminata, AAA, Cavendish, cv. Grande Naine). Their bioactive compounds were determined by the Folin-Ciocalteu assay and high-performance thin layer chromatographic (HPTLC) method. The polyphenol content of bananas harvested after 400 degree days remained unchanged during ripening, while bananas harvested after 600 and 900 degree days exhibited a significant polyphenol increase. Although dopamine was the polyphenol with the highest concentration in banana peels during the green developmental stage and ripening, its kinetics differed from the total polyphenol profile. Our results showed that this matrix of choice (maturation, ripening, and climate) may allow selection of the banana (M. acuminata, AAA, Cavendish, cv. Grande Naine) status that will produce optimal concentrations of identified compounds with human health relevance.  相似文献   

Quantum mechanics and classical computing     

Günter Mahler 《Informatik - Forschung und Entwicklung》2006,122(3):91-97

Scaling properties of modular quantum systems will dominate the future of quantum computing as well as the potential role of quantum mechanics in classical computing. We undertake a brief journey through length- and time-scales in order to locate pertinent control schemes. It is argued that ‘‘quantum benefits’’ are more likely to survive in ‘‘imbodied’’ systems like coherently driven materials, sensors or robots than in abstract digital computation.  相似文献   

Validity of student evaluation of instruction     

Hubert M. F. De Neve  Piet J. Janssen 《Higher Education》1982,11(5):543-552

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Triggered lightning in France and New Mexico     

Pierre Hubert 《Endeavour》1984,8(2):85-89

The possibility of triggering lightning by a rocket carrying a thin wire was demonstrated on a ship by M. M. Newman in 1965. Since 1973, this technique has been developed in France for operation above land. The same equipment was used successfully in New Mexico in 1981 and 1982. Triggered lightning is very attractive for many studies on lightning physics and for testing various kinds of equipment and protection devices. This explains the initiation of similar programmes in several other places.  相似文献   

Short and long term effects of a teacher-training workshop in medical school     

Sophia Mahler  Dan E. Benor 《Higher Education》1984,13(3):265-273

The effect of a teacher-training workshop in a medical school was studied. The change in instructional behavior was judged by the amount and kind of students' verbal activities during regular lessons and by the cognitive level of the teacher-student encounters. One hundred and sixty-one lessons of 60 teachers were observed in a period up to 500 days after the four-day workshop. The results indicate a considerable increase in both parameters following the training. The new level of performance was sustained for the activity parameter along the entire follow-up period. The cognitive level moderately declined after about 200 days. After 500 days the instructional behavior still was significantly different from that before the workshop. The implications for teacher-training and reinforcement interventions are discussed.  相似文献   

The Sunday‐School Hymn Tune     

Charles Hubert Farnsworth 《Religious education (Chicago, Ill.)》2013,108(4):129-134

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Disciplinary traditions and the dissemination of knowledge. An international comparison of publication patterns in journals of education     

Hubert Ertl  Klaus Zierer  David Phillips  Rudolf Tippelt 《牛津教育评论》2013,39(1):64-88

This paper presents findings from two studies of publication patterns in leading English, German, European and US journals of education. The studies were funded by the German Research Association and conducted by an international team of researchers. All papers published in 14 selected journals between 2001 and 2010 were analysed in terms of their author profile, their methodological approach and their thematic focus. The analyses resulted in publication patterns for the selected journals and at an aggregated level for the four geographic areas in which journals are published, highlighting many similarities, but also distinct differences. As far as the differences are concerned, the lower share of female authors and the relative low proportion of papers drawing on empirical research in German journals are noteworthy. For US journals, the comparatively low importance of papers drawing on the international research discourse seems to be particularly important. Based on an analysis of related studies in this field the paper demonstrates a degree of alignment of publication patterns with disciplinary traditions and formation processes in the field of education. However, the trend analysis provided also shows that some of the traditional boundaries of education as an academic discipline are in a state of flux.  相似文献   

Content-Related Knowledge of Biology Teachers from Secondary Schools: Structure and learning opportunities     

Jörg Großschedl  Daniela Mahler  Thilo Kleickmann  Ute Harms 《International Journal of Science Education》2013,35(14):2335-2366

Teachers’ content-related knowledge is a key factor influencing the learning progress of students. Different models of content-related knowledge have been proposed by educational researchers; most of them take into account three categories: content knowledge, pedagogical content knowledge, and curricular knowledge. As there is no consensus about the empirical separability (i.e. empirical structure) of content-related knowledge yet, a total of 134 biology teachers from secondary schools completed three tests which were to capture each of the three categories of content-related knowledge. The empirical structure of content-related knowledge was analyzed by Rasch analysis, which suggests content-related knowledge to be composed of (1) content knowledge, (2) pedagogical content knowledge, and (3) curricular knowledge. Pedagogical content knowledge and curricular knowledge are highly related (r_latent?=?.70). The latent correlations between content knowledge and pedagogical content knowledge (r_latent?=?.48)—and curricular knowledge, respectively (r_latent?=?.35)—are moderate to low (all ps?<?.001). Beyond the empirical structure of content-related knowledge, different learning opportunities for teachers were investigated with regard to their relationship to content knowledge, pedagogical content knowledge, and curricular knowledge acquisition. Our results show that an in-depth training in teacher education, professional development, and teacher self-study are positively related to particular categories of content-related knowledge. Furthermore, our results indicate that teaching experience is negatively related to curricular knowledge, compared to no significant relationship with content knowledge and pedagogical content knowledge.  相似文献   

Quantification of wall surface heterogeneity and its influence on species diversity at medieval castles – implications for the environmentally friendly preservation of cultural heritage     

Manuel Jonas Steinbauer  Andreas Gohlke  Christine Mahler  Andreas Schmiedinger  Carl Beierkuhnlein 《Journal of Cultural Heritage》2013,14(3):219-228

Historic buildings are important for cultural history and provide a variety of habitats for animals and plants. Especially structural heterogeneity of wall surfaces is perceived to support biological diversity. Nevertheless, in traditional approaches goals of biodiversity preservation and monument restoration are perceived to interfere and to be mutually exclusive. As a consequence, priority is often given to constructional restoration accepting the loss of local populations and biodiversity. At walls of medieval castles, including an experimental restoration project where conventional and less intensive restoration techniques were applied, we relate species composition and richness to wall properties. Especially wall surface structure is quantified using a novel approach. The study focuses on lichens, mosses and vascular plants. Boosted regression tree analyses and non-metric multidimensional scaling techniques are applied to detect the influence of abiotic site conditions on biodiversity. We find species richness to be promoted by wall surface heterogeneity. However, species composition is more affected by restoration approaches than species richness. Lichen composition varies considerably while vascular plants and mosses are less affected by wall properties. We suggest strategies that are combining both societal targets, the preservation of historic monuments and of species diversity. Careful restoration is capable of supporting both, the maintenance of cultural heritage and of rare and unique anthropogenic habitats. Wall surface heterogeneity needs to be witnessed for both aspects as it affects both species composition as well as the effectiveness of cleaning methods.  相似文献