排序方式： 共有131条查询结果，搜索用时 15 毫秒
41.
Fernando Cuetos Asunción Monsalve Alejandro Pinto Javier Rodríguez-Ferreiro 《Reading and writing》2004,17(3):227-240
Studies conducted in recent years on oral andwritten language production show that the ageat which words are learned is the main variablethat influences lexical access in both hearingpeople and people who have suffered brainlesions. No studies have been done with deafpeople and, since they use sign language inaddition to oral language, differencesregarding hearing people might be found intheir lexical organization. The aim of thisstudy was to test which variables determine thelexical production of deaf people. For thispurpose, 40 deaf people between the ages of 13and 58 years were asked to write individuallythe names of 100 pictures. The regressionanalyses performed on a total of 4000 responsesshow that the main predictor variable ofperformance was also age of acquisition. It isconcluded that the organization of the lexicalsystem in deaf people is similar to that of hearing people, although the phonologicalrepresentations of deaf people may be moreinaccurate. 相似文献
42.
When speaking of information retrieval, we often mean text retrieval. But there exist many other forms of information retrieval applications. A typical example is collaborative filtering that suggests interesting items to a user by taking into account other users’ preferences or tastes. Due to the uniqueness of the problem, it has been modeled and studied differently in the past, mainly drawing from the preference prediction and machine learning view point. A few attempts have yet been made to bring back collaborative filtering to information (text) retrieval modeling and subsequently new interesting collaborative filtering techniques have been thus derived. In this paper, we show that from the algorithmic view point, there is an even closer relationship between collaborative filtering and text retrieval. Specifically, major collaborative filtering algorithms, such as the memory-based, essentially calculate the dot product between the user vector (as the query vector in text retrieval) and the item rating vector (as the document vector in text retrieval). Thus, if we properly structure user preference data and employ the target user’s ratings as query input, major text retrieval algorithms and systems can be directly used without any modification. In this regard, we propose a unified formulation under a common notational framework for memory-based collaborative filtering, and a technique to use any text retrieval weighting function with collaborative filtering preference data. Besides confirming the rationale of the framework, our preliminary experimental results have also demonstrated the effectiveness of the approach in using text retrieval models and systems to perform item ranking tasks in collaborative filtering. 相似文献
43.
Talicia Tarver Dixie A. Jones Mararia Adams Alejandro Garcia 《Medical reference services quarterly》2013,32(4):459-467
The objective of this project was to make an institution's patients aware of a new patient portal with contextual links to MedlinePlus. Through partnerships with information technology personnel and LSU Health Shreveport clinics, the Health Sciences Library created and distributed promotional and educational materials and instructed patients on how to use MyChart and access reliable consumer health information via MedlinePlus Connect. Although most patients were not interested in coming to the library for demonstrations, many of them expressed interest in using MyChart. The contextual information in MedlinePlus Connect worked well for most topics. The institutional team leader for MyChart expressed gratitude for librarian involvement. 相似文献
44.
Julia Romero-Pastor Carolina Cardell África Yebra-Rodríguez Alejandro B. Rodríguez-Navarro 《Journal of Cultural Heritage》2013,14(6):509-514
This work shows the capability of principal component analysis (PCA) to detect molecular, chemical and mineralogical changes in historic painting materials subjected to a thermal ageing test (< 250 °C). To simulate the heat-induced alterations an ageing accelerated process was performed on two sets of samples containing two mineral phases (hydroxyapatite and quartz) and two organic compounds (collagen and albumin). The chosen minerals behaved as internal standards during the tests since they are stable and chemically inert at the tested temperatures. Raman microscopy (RM) was applied to characterise one set of samples made of bone, containing ca. 70% hydroxyapatite and 30% collagen. Attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy was used to study the other set of samples made of four different quartz/albumin mixtures with quartz contents of 30%, 50%, 70% and 90% (w/w). The aim was to identify the ideal proportion of internal standard to be validated by ATR-FTIR and PCA, determined to be 70%. PCA analyses detected changes in the molecular structures of the organic components while the internal mineral standard remained stable. Moreover, the internal standard IR/Raman bands were constant during the tests and confirmed that the results of PCA analyses were independent of instrumental and technical factors, as well as sample collecting and handling. This demonstrates the potential benefits of our approach to study historical painting materials, which have suffered any type of heat-induced alteration. 相似文献
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46.
Daniel Mayorga-Vega Alejandro Martínez-Baena Jesús Viciana 《Journal of sports sciences》2018,36(17):1913-1922
Physical education has been highlighted as an important environment for physical activity promotion, however, to our knowledge there are no previous studies examining the contribution of physical education to daily accelerometer-measured physical activity and non sedentary behaviour. The purpose was to compare the accelerometer-measured physical activity and sedentary behaviour between physical education, non-physical education and weekend days in adolescents. Of the 394 students from a Spanish high school that were invited to participate, 158 students (83 boys and 75 girls) aged 13–16 years were analyzed (wear time ≥ 600 min). Participants’ physical activity and sedentary behaviour were objectively-measured by GT3X+ accelerometers during physical education (one session), non-physical education and weekend days. Results indicated that overall adolescents had statistically significant greater physical activity levels and lower values of sedentary behaviour on physical education days than on non-physical education and weekend days (e.g., moderate-to-vigorous physical activity = 71, 54 and 57 min; sedentary = 710, 740 and 723 min) (p < 0.05). Physical education contributes significantly to reducing students’ daily physical inactivity and sedentary behaviour. Increasing the number of physical education classes seems to be an effective strategy to reduce the high current prevalence of physical inactivity and sedentary behaviour in adolescence. 相似文献
47.
This article documents public opinion research activities inMexico in the 1940s and the role played by Hungarian professorLászló Radványi, who immigrated to thatcountry at the height of World War II. Our research relies onseveral of Radványi's publications archived in differentcountries, as well as on interviews with family, acquaintances,and experts on the work of his wife, the German poet Anna Seghers.During his years in Mexico, Radványi founded the ScientificInstitute of Mexican Public Opinion, in 1941, and the InternationalJournal of Opinion and Attitude Research, in 1947—a forefatherof today's IJPOR. He was also a founding member of WAPOR. Hisearly "sample surveys" raised important methodological issuesand recorded opinion results that reflect the vibrant timesof war and policy making in a modernizing country. However,Radványi's contribution to the profession has been virtuallyforgotten. Until now, accounts about how public opinion researchbegan in Mexico either ignored Radványi's works or reducedhis ten years of survey research to a single footnote. Thisarticle is an attempt to fill this enormous omission and highlightsome of Radványi's contributions to these early stagesof survey research. 相似文献
48.
Fatima E. Terrazas-Arellanes Alejandro J. Gallard M. Lisa A. Strycker 《International Journal of Science Education》2018,40(5):498-518
The purpose of this study was to document the design, classroom implementation, and effectiveness of interactive online units to enhance science learning over 3 years among students with learning disabilities, English learners, and general education students. Results of a randomised controlled trial with 2,303 middle school students and 71 teachers across 13 schools in two states indicated that online units effectively deepened science knowledge across all three student groups. Comparing all treatment and control students on pretest-to-posttest improvement on standards-based content-specific assessments, there were statistically significant mean differences (17% improvement treatment vs. 6% control; p?相似文献
49.
Alejandro?G.?FrankEmail author Natália?Sander Luca?Gastaldi Emanuele?Madini Mariano?Corso 《知识管理研究与实践》2017,15(4):507-522
This paper proposes a model to assess the level of maturity in Virtual Communities of Practice (VCoPs). The model is based on a theoretical construction attained from the analysis of previous frameworks proposed in literature. Using this construction, we have proposed eight main organizational, managerial and technological levers to improve the performance of VCoPs. Additionally, the model presents the analysis of four performance metrics obtained from these VCoP management levers. The model presented can be used as a benchmarking tool for analysing how companies perform in their management of VCoPs. After developing the model, we applied it to a benchmarking study of four global oil and gas companies. Our results include a performance comparison among these companies as well as the main practices and technologies they use to achieve success in the management of VCoP. 相似文献
50.
Patricia Alvarez McHatton Elizabeth Shaunessy Claire Hughes Alejandro Brice Mary Ann Ratliff 《Multicultural Perspectives》2013,15(3):12-20
Hispanic students' awareness of cultural, linguistic, and sociopolitical issues are influenced by their experiences in schools and affect their sense of identity. An examination of student discourse between bilingual gifted and bilingual general education students in an urban middle school is presented, with particular attention given to how participating bilingual students relate to each other, peers (in general and gifted education), teachers, administrators, families, and communities, and how they perceive themselves. A discussion of the core issues that emerged, including students' reawakening to their ethnic identity, differing rationales for using native language, and observed differences in self-perceptions between the gifted and general education bilingual Hispanic students is provided, along with results and implications for future research. 相似文献