A Prospect-Guided global query expansion strategy using word embeddings     

Francis C. Fernández-Reyes  Jorge Hermosillo-Valadez  Manuel Montes-y-Gómez 《Information processing & management》2018,54(1):1-13

The effectiveness of query expansion methods depends essentially on identifying good candidates, or prospects, semantically related to query terms. Word embeddings have been used recently in an attempt to address this problem. Nevertheless query disambiguation is still necessary as the semantic relatedness of each word in the corpus is modeled, but choosing the right terms for expansion from the standpoint of the un-modeled query semantics remains an open issue. In this paper we propose a novel query expansion method using word embeddings that models the global query semantics from the standpoint of prospect vocabulary terms. The proposed method allows to explore query-vocabulary semantic closeness in such a way that new terms, semantically related to more relevant topics, are elicited and added in function of the query as a whole. The method includes candidates pooling strategies that address disambiguation issues without using exogenous resources. We tested our method with three topic sets over CLEF corpora and compared it across different Information Retrieval models and against another expansion technique using word embeddings as well. Our experiments indicate that our method achieves significant results that outperform the baselines, improving both recall and precision metrics without relevance feedback.  相似文献   

Pre-game hydration status, sweat loss, and fluid intake in elite Brazilian young male soccer players during competition     

Da Silva RP  Mündel T  Natali AJ  Bara Filho MG  Alfenas RC  Lima JR  Belfort FG  Lopes PR  Marins JC 《Journal of sports sciences》2012,30(1):37-42

In this study, we assessed the pre-game hydration status and fluid balance of elite young soccer players competing in a match played in the heat (temperature 31.0 ± 2.0 ° C, relative humidity 48.0 ± 5.0%) for an official Brazilian soccer competition. Fluid intake was measured during the match, as were urine specific gravity and body mass before and after the game to estimate hydration status. Data were obtained from 15 male players (age 17.0 ± 0.6 years, height 1.78 ± 0.06 m, mass 65.3 ± 3.8 kg); however, data are only analysed for 10 players who completed the full game. The mean (± s) sweat loss of players amounted to 2.24 ± 0.63 L, and mean fluid intake was 1.12 ± 0.39 L. Pre-game urine specific gravity was 1.021 ± 0.004, ranging from 1.010 to 1.025. There was no significant correlation between sweat loss and fluid intake (r = 0.504, P = 0.137) or between urine specific gravity and fluid intake (r = -0.276, P = 0.440). We conclude that young, native tropical soccer players started the match hypohydrated and replaced about 50% of the sweat lost. Thus, effective strategies to improve fluid replacement are needed for players competing in the heat.  相似文献   

Modelling the success of learning management systems: application of latent class segmentation using FIMIX-PLS     

Jorge Arenas-Gaitán  Francisco Javier Rondán-Cataluña  Patricio E. Ramírez-Correa 《Interactive Learning Environments》2018,26(1):135-147

There is not a unique attitude towards the implementation of digital technology in educational sceneries. This paper aims to validate an adaptation of the DeLone and McLean information systems success model in the context of a learning management system. Furthermore, this study means to prove (1) the necessity of segmenting students in order to fit the model more accurately and (2) the impact of other new Internet tools on students’ perceptions with regard to learning management systems. Partial least squares has been used to analyse the measurement and the structural model. Subsequently, the Finite Mixture Partial Least Squarestechnique has been employed to examine unobserved heterogeneity and to find users’ segments. The results of this research indicate that to segment between two groups of students is especially useful in order to improve the understanding of the success of a learning management system. This segmentation is made according to the importance which the students attribute to the new Internet tools to support their learning.  相似文献   

Resistance to classroom observation in the context of teacher evaluation: teachers’ and department heads’ experiences and perspectives     

Jorge Ávila de Lima  Maria João Tavares Silva 《Educational Assessment, Evaluation and Accountability》2018,30(1):7-26

This paper reports the main findings of a study that sought to understand how teachers and department heads perceived and experienced the implementation of a classroom observation system in a teacher evaluation context. The data was collected through a teacher and department head survey and interviews with department heads who were responsible for classroom observation. The findings show that respondents regarded classroom observation as an inadequate teacher evaluation instrument. It was also viewed as one of the features of the teacher evaluation system that least contributed to the teachers’ professional development. Department heads felt torn between their intermediate management role as teacher observers and their professional role as teacher peers. Cultural norms of individual professional autonomy that regulated relations among colleagues prevented department heads from using information, gathered through classroom observation, to nourish in-depth professional discussions about concrete educational practices.  相似文献   

The Birth of Particle Physics In Spain     

Víctor?Navarro-BrotónsEmail author  Jorge?Velasco?González  José?Doménech?Torres 《Minerva》2005,43(2):183-196

Experimental high-energy and nuclear physics was created in Spain thanks to Joaquín Catalá de Alemany, who founded the Institute of Corpuscular Physics (IFIC) at the University of Valencia in 1950. The physics of photographic emulsions, cheap and easy to manipulate, were well adapted to the depressed situation in Spain following the Civil War. This essay describes how, using these techniques, Catalá de Alemany created a group, established links with international laboratories, and fostered a tradition that continues today.  相似文献   

Erratum to: Two teacher quality measures and the role of context: evidence from Chile     

Maria Veronica Santelices  Edgar Valencia  Jorge Gonzalez  Sandy Taut 《Educational Assessment, Evaluation and Accountability》2017,29(2):147-153

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Preventing and reducing school violence: development of a Student and Family Office—a pilot study     

Patrícia Gouveia  Isabel Leal  Jorge Cardoso 《Educational Psychology in Practice》2019,35(1):67-81

This study introduces a pilot project—the creation of a Student and Family Office to reduce school violence—and suggests the benefits of the combined use of different strategies to decrease peer aggression and victimisation. The programme was implemented over a two-and-a-half-year period and included 132 Portuguese adolescents attending the third cycle of basic education. A considerable number of problematic situations, previously reported by students, changed after SFO intervention.. The results suggest that the local (universal and multimodal) intervention programme contributed to a decrease in harassment, coercion and aggressiveness, victimisation and reactive overt aggression rates, and also promoted the social and personal skills essential for successful interpersonal dynamics and peer conflict interventions. The implications for practice are discussed.  相似文献   

A NATIONAL INVESTIGATION OF SCHOOL PSYCHOLOGY TRAINERS’ ATTITUDES AND BELIEFS ABOUT EVIDENCE‐BASED PRACTICES          下载免费PDF全文

Linda A. Reddy  Susan G. Forman  Karen C. Stoiber  Jorge E. Gonzalez 《Psychology in the schools》2017,54(3):261-278

The present investigation examined 460 school psychology trainers’ attitudes and beliefs about the conditions for the education and training of evidence‐based practices (i.e., assessments and interventions) in training programs in the United States and Canada using an online survey. Trainer attitudes and beliefs about education and training in evidence‐based practices were measured using a 24‐item five‐point Likert scale. Overall, trainers had positive views of evidence‐based practices, as well as program and organizational support for such training. However, trainers rated the education and training of evidence‐based assessments more favorably than evidence‐based interventions. In general, trainer characteristics nor program accreditation status, model, or type of degree offered were found to influence trainers’ perceptions about evidence‐based practices. However, trainers with prior experience teaching evidence‐based intervention courses were found to have more supportive views of evidence‐based assessments and interventions than those without such experience. Implications for future training and school practice are discussed.  相似文献   

The Effects of Content-Enriched Shared Book Reading Versus Vocabulary-Only Discussions on the Vocabulary Outcomes of Preschool Dual Language Learners     

Sharolyn D. Pollard-Durodola  Jorge E. Gonzalez  Laura Saenz  Nora Resendez  Oiman Kwok  Leina Zhu 《Early education and development》2018,29(2):245-265

Research Findings: This study compared the effects of content-based shared book-reading instruction versus an explicit vocabulary-only condition on the vocabulary development of preschool dual language learners (DLLs). Using shared book reading as the mode of instruction, we randomly assigned 48 bilingual preschool teachers and 281 Spanish-speaking DLLs from their classrooms at the class level to either a content-enriched interactive book-reading intervention or a thematic content-related vocabulary-only condition. Screened using the preLAS^®, the DLLs were selected for the study based on their scores at the prefunctional and beginning levels of English proficiency. Intervention and comparison bilingual teachers implemented the assigned instructional approach in small groups, for 20 min daily, for 18 weeks. Based on the results of multilevel models, findings indicated pre- to posttest growth on taught words for each instructional condition, with no significant effects on standardized English language measures. Practice or Policy: Results suggest that preschool DLL children benefit from the systematic use of interactive content-enriched shared book-reading vocabulary instruction or direct teaching of content vocabulary when instruction integrates language interaction opportunities with higher cognitive talk and scaffolds. The vocabulary-only routine is a cost-effective approach but may not replace the broader benefits of reading books.  相似文献   

Space occupation near the basket shapes collective behaviours in youth basketball     

Pedro T. Esteves  Pedro Silva  Luís Vilar  Bruno Travassos  Ricardo Duarte  Jorge Arede 《Journal of sports sciences》2016,34(16):1557-1563

This study aimed to analyse how youth basketball players explored numerical overloads during shot attempts by measuring their space occupation across specific court areas. Four process-tracing variables measured how the number of attackers (NA), number of defenders (ND), interpersonal distance between attacker and the closest defender (ID) and distance between attacker and the basket (DBkt) impacted on the performance outcome (converted shot; missed shot; ball possession lost). Ten competitive games involving 13 U14 teams were video recorded and players’ displacements were digitised. The associations between performance outcomes and the process-tracing measures were assessed using standardised mean differences and a cross-correlation function. A multinomial logistic regression was used to calculate the odds ratio (OR) for each of the three possible outcomes. Results revealed that when shot attempts occurred at larger ID and at smaller DBkt, the possibilities to obtain a converted shot increased. The numerical overload of defenders near the scoring target was predominantly associated with offensive success. Also, the possibility of attackers to lead the spatial relation of movements with the defenders, near the scoring target, appeared as a prominent strategy to succeed. In sum, basketball teams that exhibit potential to adapt their collective behaviours to local changes in the environment might be closer to achieving successful outcomes.  相似文献