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排序方式： 共有179条查询结果，搜索用时 15 毫秒
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We present new methods of query expansion using terms that form lexical cohesive links between the contexts of distinct query terms in documents (i.e., words surrounding the query terms in text). The link-forming terms (link-terms) and short snippets of text surrounding them are evaluated in both interactive and automatic query expansion (QE). We explore the effectiveness of snippets in providing context in interactive query expansion, compare query expansion from snippets vs. whole documents, and query expansion following snippet selection vs. full document relevance judgements. The evaluation, conducted on the HARD track data of TREC 2005, suggests that there are considerable advantages in using link-terms and their surrounding short text snippets in QE compared to terms selected from full-texts of documents. 相似文献
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Evdokimova Olga L. Alves Carla S. Krsmanović Whiffen Radenka M. Ortega Zaida Tomás Helena Rodrigues João 《Journal of Zhejiang University. Science. B》2021,22(6):450-461
In this study, the fibers of invasive species Agave americana L. and Ricinus communis L. were successfully used for the first time as new sources to produce cytocompatible and highly crystalline cellulose nanofibers. Cellulose nanofibers were obtained by two methods, based on either alkaline or acid hydrolysis. The morphology, chemical composition, and crystallinity of the obtained materials were characterized by scanning electron microscopy(SEM) together with energy-dispersive X-ray spectroscopy(EDX), dynamic light scattering(DLS), X-ray diffraction(XRD), and Fourier transform infrared(FTIR)spectroscopy. The crystallinity indexes(CIs) of the cellulose nanofibers extracted from A. americana and R. communis were very high(94.1% and 92.7%, respectively). Biological studies evaluating the cytotoxic effects of the prepared cellulose nanofibers on human embryonic kidney 293 T(HEK293 T) cells were also performed. The nanofibers obtained using the two different extraction methods were all shown to be cytocompatible in the concentration range assayed(i.e., 0-500 μg/mL). Our results showed that the nanocellulose extracted from A. americana and R. communis fibers has high potential as a new renewable green source of highly crystalline cellulose-based cytocompatible nanomaterials for biomedical applications. 相似文献
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Chantal Mutimukwe Olga Viberg Lena-Maria Oberg Teresa Cerratto-Pargman 《British journal of educational technology : journal of the Council for Educational Technology》2022,53(4):932-951
Understanding students' privacy concerns is an essential first step toward effective privacy-enhancing practices in learning analytics (LA). In this study, we develop and validate a model to explore the students' privacy concerns (SPICE) regarding LA practice in higher education. The SPICE model considers privacy concerns as a central construct between two antecedents—perceived privacy risk and perceived privacy control, and two outcomes—trusting beliefs and non-self-disclosure behaviours. To validate the model, data through an online survey were collected, and 132 students from three Swedish universities participated in the study. Partial least square results show that the model accounts for high variance in privacy concerns, trusting beliefs, and non-self-disclosure behaviours. They also illustrate that students' perceived privacy risk is a firm predictor of their privacy concerns. The students' privacy concerns and perceived privacy risk were found to affect their non-self-disclosure behaviours. Finally, the results show that the students' perceptions of privacy control and privacy risks determine their trusting beliefs. The study results contribute to understand the relationships between students' privacy concerns, trust and non-self-disclosure behaviours in the LA context. A set of relevant implications for LA systems' design and privacy-enhancing practices' development in higher education is offered.
Practitioner notes
What is already known about this topic- Addressing students' privacy is critical for large-scale learning analytics (LA) implementation.
- Understanding students' privacy concerns is an essential first step to developing effective privacy-enhancing practices in LA.
- Several conceptual, not empirically validated frameworks focus on ethics and privacy in LA.
- The paper offers a validated model to explore the nature of students' privacy concerns in LA in higher education.
- It provides an enhanced theoretical understanding of the relationship between privacy concerns, trust and self-disclosure behaviour in the LA context of higher education.
- It offers a set of relevant implications for LA researchers and practitioners.
- Students' perceptions of privacy risks and privacy control are antecedents of students' privacy concerns, trust in the higher education institution and the willingness to share personal information.
- Enhancing students' perceptions of privacy control and reducing perceptions of privacy risks are essential for LA adoption and success.
- Contextual factors that may influence students' privacy concerns should be considered.
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Alexei Matveev Olga Matveev Vassily Zhukov 《European Journal of Engineering Education》2005,30(3):321-328
Education and training serve as critical elements of advancement of a nation’s economy in transition. The restructuring of the power engineering industry in Russia has called for a fast implementation of new management system in electric power engineering and radical training of professional managers at different levels in organizations. Management training in electric power engineering in Russia has been implemented by (1) preparing highly professional managers in higher education institutions and technical universities and by (2) improving the management skills of practicing managers in technical universities and educational centers of different power energy companies. This article reports the experience of introducing a new discipline ‘Management in Electrical Engineering’ at the Moscow Power Engineering Institute (Technical University) and reflects on training managers in electric power engineering at higher education and corporate educational centers. 相似文献
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This paper studies the publication productivity of inbreds and non‐inbreds among Russian academics. Existing literature provides ambiguous results on the relationship between inbred status and productivity. This may be explained by the use of different indicators for measuring publication productivity. We use data, which include indicators of both current publication productivity (at a certain point of time) and cumulative productivity (throughout the career) to identify whether inbreds and non‐inbreds differ in their productivity. We did not find any difference in current publication productivity of inbreds and non‐inbreds. We found, however, a difference in their cumulative publication productivity: non‐inbreds are being more productive on an individual level throughout their careers. Although the conclusions are based on the Russian data, the analysis provides an explanation for existing contradictory results on the relationship between academic inbreeding and productivity in general. 相似文献
9.
Olga Fedorenko 《Inter-Asia Cultural Studies》2017,18(4):498-517
This article examines conflicts over the transnationalization of South Korean celebrities in the wake of the Korean Wave (Hallyu) in the twenty-first century. I consider a number of celebrity controversies to argue that the demands placed upon Hallyu celebrities by domestic observers, foreign audiences, and global capital are fundamentally irreconcilable. South Korean nationalist appropriation of Hallyu, as well as the local celebrity culture, demand that Hallyu stars firstly be exemplary Korean patriots, whereas international audiences expect sympathy for their own causes. Local nationalist agendas have proven particularly troublesome because of postcolonial sensibilities and ongoing territorial disagreements between South Korea and its neighbors. Finally, as circulating commodities and commercial assets, Hallyu stars are also pledged to global capital. Their value is highest when they appeal to as broad an audience as possible and alienate no one with their politics. An apolitical neutrality on regionally controversial issues, however, is an untenable position when antagonistic geopolitical interests are concerned and nationalist passions flare. I situate this argument within critical scholarship on cultural globalization flows within Asia, while engaging celebrity studies to frame Hallyu stars as transnational commodities. 相似文献
10.
This study examined the effect of a short-term training programme οn in-service physical education teachers’ behaviour and students’ engagement in learning. Teachers (n = 32) were randomly divided into an experimental and a control group. Each teacher’s behaviour was observed in six lessons; two for each measurement (pre, post and retention) and analysed with qualitative dimensions of lesson introduction, task presentations and lesson closure. Student engagement was analysed with the time analysis form. The total and successful attempts of selected students were also recorded. The experimental group attended a two-hour lecture followed by a two-hour practicum, and showed significant improvement and learning of all the examined behaviours as well as significantly higher performance than the control group. Also, students of the experimental teacher group presented significantly greater activity time, more practice attempts and more successful ones than their peers in the control group. The results establish the effect of the training programme on teacher behaviour and student engagement in learning. 相似文献