Managing structured queries in probabilistic XML retrieval systems     

Luis M. de Campos  Juan M. Fernández-Luna  Juan F. Huete  Carlos Martín-Dancausa 《Information processing & management》2010

Focusing on the context of XML retrieval, in this paper we propose a general methodology for managing structured queries (involving both content and structure) within any given structured probabilistic information retrieval system which is able to compute posterior probabilities of relevance for structural components given a non-structured query (involving only query terms but not structural restrictions). We have tested our proposal using two specific information retrieval systems (Garnata and PF/Tijah), and the structured document collections from the last six editions of the INitiative for the Evaluation of XML Retrieval (INEX).  相似文献   

Mobility versus job stability: Assessing tenure and productivity outcomes     

Laura Cruz-Castro  Luis Sanz-Menéndez 《Research Policy》2010,39(1):27-38

Based on the data from survey responses and publications of 1583 academic scientists in Spain, this paper examines the relationship between scientific performance and reward, considering tenure and permanent positions as key academic rewards in early phases of academic career and focusing especially on the mediating effect of mobile versus stable career paths. Although widely practiced, inbreeding has often been considered to be at odds with universalism and merit in science. Our findings indicate that inbred faculty does not get tenure with less scientific merits than PhDs from other institutions; we also find that non-mobile careers are a strong predictor of the timing of rewards in the form of early permanent positions. Our results question the assumption mainly based on US evidence that mobility enhances career. These findings must be interpreted in the context of organizational and institutional features of the Spanish academic system that promote the development of internal academic research job markets.  相似文献   

Autonomy and Authority in Public Research Organisations: Structure and Funding Factors     

Laura Cruz-Castro  Luis Sanz-Menéndez 《Minerva》2018,56(2):135-160

This paper establishes a structural typology of the organisational configurations of public research organisations which vary in their relative internal sharing of authority between researchers and managers; we distinguish between autonomous, heteronomous and managed research organisations. We assume that there are at least two sources of legitimate authority within research organisations, one derived from formal hierarchy (organisational leadership) and another derived from the research community (professional); the balance of authority between researchers and managers is essentially structural but is empirically mediated by the funding portfolio of organisations and the corresponding endowment of resources at the disposal of leaders or researchers. Changes in the level, sources and strings of organisational and individual research funding are expected to affect the balance of internal authority in different ways depending on the organisational configuration, and to open the door to the influence of external actors in the development of research agendas.  相似文献   

Postural control and physiological responses to a simulated match in U-20 judo competitors     

Luis Santos  Javier Fernández-Río  Eliseo Iglesias-Soler  Miguel Blanco-Traba  Markus Due Jakobsen  Vicente González-Díez 《Sports biomechanics / International Society of Biomechanics in Sports》2020,19(3):281-294

Abstract

The aim was to evaluate the effects of judo combat on the athletes’ postural control (PC) and physiological loading before, during and after a simulated match. Seventeen under-20 regional and national level athletes completed one modified 7-min match. At baseline, during the combat (3rd and 7th minutes) and 2-min post-match centre of pressure (CoP) parameters were assessed. Heart rate (HR), blood lactate (BLa) and rating of perceived exertion (RPE) and local RPE (LRPE) were collected. Significant increments were observed in CoP mean positioning and velocity at 3rd and 7th minutes, but the CoP deviation in both axes was unaffected. HR and BLa were elevated at 3rd and 7th minutes, and they remained elevated 2-min post-match. However, CoP returned to baseline 2-min post-match. RPE was elevated at 3rd and 7th minutes and the greatest effort was displayed in the Deltoid and Quadriceps. Thus, one simulated judo match stimulates a significant metabolic response and balance is degraded, with the greatest effects on the anterior–posterior axis and it recovers to baseline level after 2 min of passive rest. The physiological load cannot be regarded as a potential predictor variable of CoP. Overall, a judo match predominantly affects the upper body than the other body parts.  相似文献   

Prediction of abandonment in Spanish fitness centres     

Iván Clavel San Emeterio  Jorge García-Unanue  Eliseo Iglesias-Soler  Jose Luis Felipe  Leonor Gallardo 《European Journal of Sport Science》2019,19(2):217-224

Research question: The increase of physical exercise in fitness centres has turned these facilities in important active lifestyle promoters. However, only between 30% and 60% of subscribers still linked to the sports centre after a year. The aim of this study is to design a model to predict the drop out in fitness centres. Research methods: Monthly data corresponding to the actual behaviour of 14,522 members of three sport centres in Spain were recorded over the course of one year. In order to calculate the likelihood of drop out, logistic regressions were used to create predictive models for each centre. Results and findings: It was possible to predict abandonment of users of sport centres from their historical behaviour, although the predictive models obtained for each centre were not completely coincident. The effectiveness of the models was around 70%. Implications: The analysis of users’ behaviour in a fitness centre can allow to avoid the drop out and therefore the abandonment of physical activity. Segmenting the customers based on the likelihood of drop out may be useful for improving the effectiveness of the strategies of loyalty and for optimizing the organization of human and material resources.  相似文献   

Gonadal hormones may predict structural bone fragility in elite female soccer player     

Charlotte Lanhers  Daniel Courteix  João Valente-Dos-Santos  Beatrice Ferry  Luis Gracia-Marco  Bruno Pereira 《Journal of sports sciences》2020,38(7):827-837

ABSTRACT

Purpose: This study determined the impact of menstrual status on bone tissue in elite post-pubertal female soccer players over an entire season.

Methods: Fifty-one elite female soccer players participated. At baseline, forty-one were assigned to the low hormonal androgenic profile (low-HAPL) and 10 to the high hormonal androgenic profile (high-HAPL).

Results: An 8-month training program led to increased bone mineral density content (p<0.05). The low-HAPL athletes improved the Narrow neck average cortical thickness (ACT) by 1.4% and reduced the corresponding Buckling ratio (BR) by 2.6%, thus decreasing the fracture risk (p<0.05). The high-HAPL athletes decreased the Narrow neck ACT by 5.4% and increased the BR by 2.6%, increasing fracture risk (p<0.05). Differences were assigned as being “very likely beneficial” for the low-HAPL athletes, supported by very large (d=3.41) and large (d=1.58) effect sizes for the Narrow neck ACT and BR, respectively.

Conclusion: A season of soccer training has induced bone geometry improvements in adolescent females. Bone health parameters improved in the two clusters. However, high-HAPL athletes decreased its resistance to loading compare to low-HAPL athletes. Even if female players do not present clinical symptoms related to their hormonal status, sport medicine physicians should pay attention to their structural bone fragility.  相似文献   

Book review: The first century of the International Commission on Mathematical Instruction     

Luis Rico 《Educational Studies in Mathematics》2010,73(2):205-210

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The construction of parents and teachers as agents for the improvement of municipal schools in Chile     

Carmen Montecinos  Vicente Sisto  Luis Ahumada 《比较教育学》2010,46(4):487-508

This article examines how teachers and parents in 10 municipal schools serving students growing up under conditions of social vulnerability represented themselves, and others, as valid agents for charting school improvement. In four schools parents and teachers saw each other as trustworthy and collaborating to provide an education that could transform students’ life chances. In the other six schools, social relations were marked by distrust, staff constructed students as lacking the resources necessary to benefit from a rigorous academic programme, and parents in leadership positions shared with teachers the belief that school failure could largely be attributed to uncommitted parents. These results suggest that the impact of quality assurance policies tends to be associated with the social capital of municipal schools, thus educational policy needs to consider developing and strengthening social capital within schools.  相似文献   

The path to information in the public domain: Official publications in Spain     

Luis Fernando Ramos SimónAuthor Vitae  Iuliana Botezan 《Government Information Quarterly》2010

Official publications are aimed towards editing and spreading the messages created by governments and other bodies of the public domain. At the beginning, the aim of this activity is twofold: on the one hand, fulfilling the principle of publicity of the norms, as it constitutes a basis for the efficiency of those, and, on the other hand, fulfilling a general function of information about the activities of public authorities. As the action of government generalises, this function of communication between those governing and those governed has extended to other fields of activity, thus, free and pay materials, both printed and electronic, are published.  相似文献   

School and Community Wellness: Transforming Achievement Using a Holistic Orientation to Learning     

Rick Oser  Ellen Beck  Jose Luis Alvarado  Valerie Ooka Pang 《Multicultural Perspectives》2014,16(1):26-34

A comprehensive school and community wellness plan was developed and implemented to transform Lemon Grove Academy for the Sciences and Humanities, an urban school, where student achievement and faculty satisfaction has soared. The school has become the center for the local neighborhood where culture, language, and equity are valued. The school's Comprehensive Wellness Plan includes student wellness, family wellness, staff/faculty wellness, and environmental wellness.  相似文献