排序方式： 共有9条查询结果，搜索用时 171 毫秒
1
1.
The need to cluster small text corpora composed of a few hundreds of short texts rises in various applications; e.g., clustering top-retrieved documents based on their snippets. This clustering task is challenging due to the vocabulary mismatch between short texts and the insufficient corpus-based statistics (e.g., term co-occurrence statistics) due to the corpus size. We address this clustering challenge using a framework that utilizes a set of external knowledge resources that provide information about term relations. Specifically, we use information induced from the resources to estimate similarity between terms and produce term clusters. We also utilize the resources to expand the vocabulary used in the given corpus and thus enhance term clustering. We then project the texts in the corpus onto the term clusters to cluster the texts. We evaluate various instantiations of the proposed framework by varying the term clustering method used, the approach of projecting the texts onto the term clusters, and the way of applying external knowledge resources. Extensive empirical evaluation demonstrates the merits of our approach with respect to applying clustering algorithms directly on the text corpus, and using state-of-the-art co-clustering and topic modeling methods. 相似文献
2.
3.
Situated Simulation-Based Learning Environment to Improve Proportional Reasoning in Nursing Students
Ilana Dubovi Sharona T. Levy Efrat Dagan 《International Journal of Science and Mathematics Education》2018,16(8):1521-1539
Proportional reasoning is the basis for most medication calculation processes and is fundamental for high-quality care and patient safety. We designed a simulated Medication Mathematics (siMMath) environment to support proportional reasoning in transitioning via concreteness fading between two mediators. The first mediator is simulated nursing tools of medication preparation. The second is a ratio-table setup which is used as a goal representation, which enables one to spatially hold in place different quantities in their relative proportion. We conducted a two-part study with nursing students. Part 1 was a quasi-experimental pretest–intervention–posttest design assessing the effectiveness of learning, by evaluating four categories of medical calculation questionnaire items (solid medications, unit conversion, concentrations, infusion rates). We used the Noelting proportional reasoning test to evaluate the generalizability and abstraction of proportional reasoning. Part 1 included an experimental group (n = 96) learning with siMMath, and a comparison group (n = 73) learning with an equation-based lecture approach. Part 2 employed a case study design to characterize the learning process. The experimental group’s learning gains were significantly higher than the comparison group’s for the two most challenging categories of the medication calculation problems questionnaire, namely concentrations and infusion rates. Furthermore, the experimental group’s learning gains were significantly higher than the comparison group’s for formal operational reasoning on the Noelting test. Students who used a ratio-table setup scored significantly higher on the Noelting posttest questionnaire. Nursing students who learned with the siMMath environment overcame difficulties in proportional reasoning to the highest levels and extended this understanding to other contexts. 相似文献
4.
5.
Stein D Pat-Horenczyk R Blank S Dagan Y Barak Y Gumpel TP 《Journal of learning disabilities》2002,35(3):268-275
We evaluated 32 nonmedicated male adolescents diagnosed with attention-deficit/hyperactivity disorder (ADHD) in childhood, 35 male adolescents similarly diagnosed who were receiving methylphenidate (MPH), and 77 control boys. Both ADHD groups completed self-report questionnaires assessing sleep disturbances; weekday and holiday sleep duration; and symptoms of ADHD, anxiety, and depression. Parents and teachers rated the severity of the participants' ADHD. The control group completed self-report questionnaires assessing sleep disturbances. We found that nonmedicated participants and controls did not differ in the severity of sleep disturbance. In contrast, the medicated participants demonstrated a significantly greater severity of sleep disturbance compared with the nonmedicated participants and reported elevated levels of symptoms of ADHD, anxiety, and depression. Specific analyses showed that depressive symptoms contributed significantly to the degree of sleep disturbance when controlling for ADHD diagnosis and MPH treatment. These findings suggest that among adolescents with ADHD symptoms, the severity of symptoms of depression may contribute to the degree of sleep disturbance in addition to the effect of their primary disorder and MPH treatment. 相似文献
6.
Deborah Court Liat Merav Etty Ornan 《International Journal of Early Years Education》2009,17(3):207-217
This study investigated 10 Israeli preschool teachers’ reasons for choosing their profession and their perceptions of the teacher’s role. A narrative approach was chosen because teachers’ narratives can reveal their practical knowledge and the meanings they ascribe to their teaching. Data were subjected to content analysis and linguistic analysis. The content analysis revealed that choice of profession flowed from personal history and family background and reflected the needs, priorities and ambitions of each teacher. Most of the participants chose this profession at an early stage, in childhood or adolescence, and were influenced by close family members. An ongoing connection was revealed between key events and people in the preschool teachers’ narratives, their perceptions of the teacher’s role and their professional selves. The linguistic analysis revealed beliefs and values expressed through figurative language, and especially metaphor. Metaphoric themes related mainly to the nurturing of children and were consistent with beliefs and values expressed directly. 相似文献
7.
邱亚玖 《体育成人教育学刊》2004,20(3):21-22
学生学习成绩的评价问题是体育新课程的一个焦点问题，是实施素质教育的突破口。运用Fuzzy(模糊)公式法，建立学生学习成绩综合评价模式，通过分值量化以评价学生体育课学习的效果，为教师的教和学生的学提供依据，促使学生更好地进行体育学习和自觉参与体育活动。 相似文献
8.
Durdane Bayram-Jacobs Ineke Henze Maria Evagorou Yael Shwartz Elin Leirvoll Aschim Silvia Alcaraz-Dominguez Mario Barajas Etty Dagan 《科学教学研究杂志》2019,56(9):1207-1233
The purpose of this study is to provide insight into short-term professionalization of teachers regarding teaching socioscientific issues (SSI). The study aimed to capture the development of science teachers' pedagogical content knowledge (PCK) for SSI teaching by enacting specially designed SSI curriculum materials. The study also explores indicators of stronger and weaker development of PCK for SSI teaching. Thirty teachers from four countries (Cyprus, Israel, Norway, and Spain) used one module (30–60 min lesson) of SSI materials. The data were collected through: (a) lesson preparation form (PCK-before), (b) lesson reflection form (PCK-after), (c) lesson observation table (PCK-in-action). The data analysis was based on the PCK model of Magnusson, Krajcik, and Borko (1999). Strong development of PCK for SSI teaching includes “Strong interconnections between the PCK components,” “Understanding of students' difficulties in SSI learning,” “Suggesting appropriate instructional strategies,” and “Focusing equally on science content and SSI skills.” Our findings point to the importance of these aspects of PCK development for SSI teaching. We argue that when professional development programs and curriculum materials focus on developing these aspects, they will contribute to strong PCK development for SSI teaching. The findings regarding the development in the components of PCK for SSI provide compelling evidence that science teachers can develop aspects of their PCK for SSI with the use of a single module. Most of the teachers developed their knowledge about students' understanding of science and instructional strategies. The recognition of student difficulties made the teacher consider specific teaching strategies which are in line with the learning objectives. There is an evident link between the development of PCK in instructional strategies and students' understanding of science for SSI teaching. 相似文献
9.
1