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Lesly Alejandra Gonzalez Camacho Solange Nice Alves-Souza 《Information processing & management》2018,54(4):529-544
Recommender Systems are currently highly relevant for helping users deal with the information overload they suffer from the large volume of data on the web, and automatically suggest the most appropriate items that meet users needs. However, in cases in which a user is new to Recommender System, the system cannot recommend items that are relevant to her/him because of lack of previous information about the user and/or the user-item rating history that helps to determine the users preferences. This problem is known as cold-start, which remains open because it does not have a final solution. Social networks have been employed as a good source of information to determine users preferences to mitigate the cold-start problem. This paper presents the results of a Systematic Literature Review on Collaborative Filtering-based Recommender System that uses social network data to mitigate the cold-start problem. This Systematic Literature Review compiled the papers published between 2011–2017, to select the most recent studies in the area. Each selected paper was evaluated and classified according to the depth which social networks used to mitigate the cold-start problem. The final results show that there are several publications that use the information of the social networks within the Recommender System; however, few research papers currently use this data to mitigate the cold-start problem. 相似文献
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Writing is a task that entails high cognitive and linguistic efforts, especially when producing academic texts. Academic language might be one of the factors influencing the quality of written texts, given that prior research has shown its impact on reading comprehension. The purpose of this study is to examine the contribution of Spanish Core Academic Language Skills (S-CALS) and academic vocabulary to the quality of written argumentation and explanation. For this study, 126 Chilean 8th grade students produced an argumentative text and an explanatory text about the same topic. In addition, their academic vocabulary was assessed with the S-AVoc-T test and their CALS with the S-CALS-I test. Results show that both CALS and academic vocabulary are significantly and positively correlated with both writing tasks. Even though these instruments make different contributions to the predictive models in each discursive genre, a Principal Component Analysis revealed that the model that best explains writing quality are those which combine both language variables, namely Spanish Core Academic Language and Vocabulary Skills (S-CALVS). In argumentation, the S-CALVS model explains 29% of the variance, after controlling by gender. In contrast, in explanation, S-CALVS explains 35% of the variance. It is concluded that it is relevant to develop situated writing in each discursive genre and, upon that basis, to work with both CALS and academic vocabulary, because they have a specific impact on academic texts writing. 相似文献
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Ricardo Rosas María-Paz Ramírez Alejandra Meneses Alejandra Guajardo 《Infancia y Aprendizaje》2017,40(1):158-188
Reading difficulties have reached a prevalence of 3–10% in school-age children. Those who present these difficulties avoid reading and benefit very little from school-based learning opportunities, resulting in maladjustments, dropping out of school and having to repeat grades. Presented here are the results of an intervention based on a computer game intended for explicit phonic training in first-grade school children at risk of possessing reading difficulties. Fifty-six children from a low socioeconomic status (SES) and 31 children from a high socioeconomic status, divided into two groups (control and experimental), participated in the study. After the intervention, participants from the low-SES experimental group had enhanced their skills regarding letter sound recognition, whereas the high-SES experimental group had improved their naming speed. The results are discussed in light of the impact of interventions based on computer games and of the importance of the development of sublexical skills in children at risk of manifesting reading difficulties in transparent orthographies. 相似文献
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This study focuses on quantifying the quality of mathematics teaching in 183 randomly selected sixth grade classrooms: 100 from the North West province of South Africa and 83 from South East Botswana. The teaching quality is measured by coding videotaped lessons for three different components: mathematical proficiency, level of cognitive demand, and observed teacher knowledge. Results suggest that the overall teaching quality is about the same in both regions. Some variation was observed at the level of each component. For example, in the South Africa sample the students engage more in tasks that just involve “memorization” and less in tasks that involve “procedures without connections” in comparison with the Botswana students. Teachers in Botswana implement the official curriculum more faithfully than do those in North West. In both countries most of the learners engaged only in low-level tasks (very little activity involved “procedures with connections”) and teachers demonstrated a lack of knowledge about how to integrate mathematical content with effective pedagogical techniques. 相似文献
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Growing evidence suggests that child care instability is associated with child behavior problems, but existing studies confound different types of instability; use small, convenience samples; and/or control insufficiently for selection into child care arrangements. This study uses survey and calendar data from the Fragile Families and Child Well-Being Study to estimate the associations between three different types of child care instability—long-term instability, multiplicity, and the use of back-up arrangements—and children's internalizing, externalizing, and prosocial behaviors at age 3, controlling for a large number of child and family background characteristics. Long-term instability between birth and age 3, as measured in both the survey and calendar data, is associated with higher levels of externalizing behavior problems. Current multiplicity at age 3 (as measured by survey data) is associated with higher levels of both externalizing and internalizing behavior problems, but stable multiplicity over time (as measured using calendar data) is not. Finally, the use of back-up arrangements at age 3 is associated with higher levels of internalizing behaviors. We find no consistent differences in these results by the timing of instability, child gender, family income, or type of care. 相似文献
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Lourdes Campero Alejandra Benítez Erika Atienzo Guillermo González Eréndira Marín 《Gender and education》2014,26(2):151-167
Research focused on adolescent pregnancy reports that this event acquires significance and has different consequences according to the context and social subjects who experience it. In this study, by means of a sample formed by adolescent women and men who are socially vulnerable in Mexico, with and without a history of pregnancy, we can see how this reproductive event turns into a factor of educational vulnerability and how their possibilities and expectations with respect to continuing in school are determined in a differentiated manner, according to gender. The findings show that adolescent pregnancy in vulnerable sectors is scarcely compatible with educational projects and that possibilities and expectations to continue in or re-enter the school system are determined by gender differences; these usually lead to fewer opportunities for adolescent women to return to school during or after pregnancy. 相似文献
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The adoption of e-Customs platforms to simultaneously ensure regulatory compliance and to facilitate trade is a major strategic issue for governments and customs administrations worldwide. It ensures a more cost-efficient usage of resources while preserving a smooth flow of goods across international borders. Hence, customs administrations are challenged to favor the introduction of IT systems that may enhance the ability to improve information sharing with the business sector, as well as with other governmental agencies. This is often not a straightforward process. As many experts point out, e-Government development projects fail commonly due to the lack of thorough understanding of administration requirements as well as barriers for implementation. Hence, the purpose of this study is to understand what factors enable or hinder the exploitation of e-Customs platforms. By means of a Systematic Literature Review (SLR), a theoretical framework is developed to identify drivers and barriers for usage of e-Government/e-Customs platforms. Thereby, a survey instrument was developed and data was collected in occasion of a World Customs Organization (WCO) Annual Council meeting, which was joined by around 400 customs delegates and officers from 178 WCO member administrations. A total of 94 questionnaires have been collected and analyzed, which gives an approximate response rate of 23% (46% considering only the 178 member administrations). The analysis of data has been performed by a combination of multivariate techniques and ANOVA. Results show that factors like cost-savings and ease of use significantly influence the usage of e-Customs platforms. On the contrary, cost-efficiency and usefulness of e-Customs platforms have no significant impacts. From the perspective of barriers preventing adoption, this paper identifies two main factors: 1) technical constraints and costs and 2) quality and trust. Both these factors significantly influence adoption of information sharing, in the context of business-customs communication. 相似文献
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