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Soojung Jang 《Distance Education》2000,21(1):136-161
Understanding complex conceptual relationships is crucial for Korean high school history learning. The motivating hypothesis for this study is that a Cognitive Flexibility Theory‐based Hypertext instructional module will promote acquisition of advanced knowledge associated with complex conceptual relationships. This study focussed on improving Korean history teaching and learning in terms of these learner characteristics based on Cognitive Flexibility Theory, an influential constructivist approach in the field of educational technology. A referential hypertext program based on Spiro and his colleagues’ (1988, 1990) Cognitive Flexibility Theory (CFT) was developed for this study. Three learning programs were presented: (1) Cognitive Flexibility Theory‐Based Hypertext (CFTH), (2) hierarchical hypertext, similar to CFTH except for its hierarchical node connections, and (3) a textbook representing the typical Korean high school history instruction process. The effects of these three treatments on history achievement were examined in terms of post‐test item characteristics. Independent variables were students’ IQ, and prior knowledge and motivation toward each learning program that was measured after the treatment. Students’ achievement was the highest among three groups, especially in complex items: comparison, analysis and synthesis. In the CFTH group high IQ and low PK students’ achievement was most improved, and motivation was the chief influential factor in explaining the achievement. 相似文献
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This paper analyzes the organizational schemes of information resources found in top 50 academic business library websites through content analysis and discusses the development and evaluation of the identified schemes. 相似文献
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Soojung Chae Eun-Young Park 《International Journal of Disability, Development & Education》2019,66(4):343-361
AbstractThis article presents the results of a meta-analysis of the effects of school-based interventions for improving disability awareness and attitudes towards disability of students without disabilities in Kindergarten through secondary school grades in the Republic of Korea (South Korea). A total of 20 studies published between 2001 and 2017 were included, covering a sample of 2679 students without disabilities. The overall effect was statistically significant and large (d = 1.335). Specifically, subgroup analyses showed that the effects were large for contact-based interventions, use of materials, role-playing, and human rights interventions in that order. The school-based interventions were significantly more effective in improving attitudes towards disability than disability awareness. The intervention effects did not significantly differ by school levels. Results of meta-regression analyses showed that the number of sessions had significantly more impact than instructional time per session. Limitations, recommendations for future studies, and practical implications are discussed. 相似文献
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Cell isolation in designated regions or from heterogeneous samples is often required for many microfluidic cell-based assays. However, current techniques have either limited throughput or are incapable of viable off-chip collection. We present an innovative approach, allowing high-throughput and label-free cell isolation and enrichment from heterogeneous solution using cell size as a biomarker. The approach utilizes the irreversible migration of particles into microscale vortices, developed in parallel expansion-contraction trapping reservoirs, as the cell isolation mechanism. We empirically determined the critical particle∕cell diameter D(crt) and the operational flow rate above which trapping of cells∕particles in microvortices is initiated. Using this approach we successfully separated larger cancer cells spiked in blood from the smaller blood cells with processing rates as high as 7.5×10(6) cells∕s. Viable long-term culture was established using cells collected off-chip, suggesting that the proposed technique would be useful for clinical and research applications in which in vitro culture is often desired. The presented technology improves on current technology by enriching cells based on size without clogging mechanical filters, employing only a simple single-layered microfluidic device and processing cell solutions at the ml∕min scale. 相似文献
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