A small-scale concept-based laboratory component: the best of both worlds   总被引：2，自引：2，他引：0  

Halme DG  Khodor J  Mitchell R  Walker GC 《CBE life sciences education》2006,5(1):41-51

In this article, we describe an exploratory study of a small-scale, concept-driven, voluntary laboratory component of Introductory Biology at the Massachusetts Institute of Technology. We wished to investigate whether students' attitudes toward biology and their understanding of basic biological principles would improve through concept-based learning in a laboratory environment. With these goals in mind, and using our Biology Concept Framework as a guide, we designed laboratory exercises to connect topics from the lecture portion of the course and highlight key concepts. We also strove to make abstract concepts tangible, encourage learning in nonlecture format, expose the students to scientific method in action, and convey the excitement of performing experiments. Our initial small-scale assessments indicate participation in the laboratory component, which featured both hands-on and minds-on components, improved student learning and retention of basic biological concepts. Further investigation will focus on improving the balance between the minds-on concept-based learning and the hands-on experimental component of the laboratory.  相似文献   

Effects of a professional development program on classroom practices and outcomes for Latino dual language learners     

Virginia Buysse  Dina C. Castro  Ellen Peisner-Feinberg 《Early childhood research quarterly》2010

A randomized, controlled study was conducted to assess the effects of the Nuestros Niños professional development program on classroom practices and child outcomes related to language development and early literacy skills in both English and Spanish. Fifty-five teachers and 193 Latino dual language learners (DLLs) enrolled in the North Carolina More at Four Pre-Kindergarten Program participated in the study. The content of the professional development program consisted of research-based instructional practices designed to complement the core curriculum and scaffold learning for DLLs, and the format included professional development institutes, individualized consultation, and community of practice meetings. The results showed that the intervention led to measurable improvements in both the overall quality of teachers’ language and literacy practices as well as those specific to working with Latino DLLs, and greater gains in children's phonological awareness skills in their primary language.  相似文献   

Using Small-Scale Randomized Controlled Trials to Evaluate the Efficacy of New Curricular Materials     

Dina Drits-Esser  Kristin M. Bass  Louisa A. Stark 《CBE life sciences education》2014,13(4):593-601

How can researchers in K–12 contexts stay true to the principles of rigorous evaluation designs within the constraints of classroom settings and limited funding? This paper explores this question by presenting a small-scale randomized controlled trial (RCT) designed to test the efficacy of curricular supplemental materials on epigenetics. The researchers asked whether the curricular materials improved students’ understanding of the content more than an alternative set of activities. The field test was conducted in a diverse public high school setting with 145 students who were randomly assigned to a treatment or comparison condition. Findings indicate that students in the treatment condition scored significantly higher on the posttest than did students in the comparison group (effect size: Cohen''s d = 0.40). The paper discusses the strengths and limitations of the RCT, the contextual factors that influenced its enactment, and recommendations for others wishing to conduct small-scale rigorous evaluations in educational settings. Our intention is for this paper to serve as a case study for university science faculty members who wish to employ scientifically rigorous evaluations in K–12 settings while limiting the scope and budget of their work.  相似文献   

Electronic Learning Delivery Systems: A Selection Model     

Peter J. Pallesen  Paul Haley  Edward S. Jones  Bobbie Moore  Dina E. Widlake  Karen L. Medsker 《Performance Improvement Quarterly》1999,12(4):7-32

Electronic learning delivery systems discussed include satellite networks, teleconferencing, Internet/Intranet networks, desktop multimedia, electronic performance support systems (EPSS), transportable audio/video (i.e., systems relying primarily on physically transportable audio-and videotaped materials), and the electronically enhanced classroom. Selecting one of these systems can be a daunting task when all relevant issues are considered. The selection model described in this article narrows the choices to the system most likely to be instructionally, economically, and technologically appropriate. After establishing working definitions, the model suggests four stages of user activity: 1) Assessing several important overall factors, including outcomes and conditions of learning, economics, synchronicity and location, and organizational culture; 2) Rating the importance of several learning system attributes to the training project; 3) Selecting the system that most ideally supports the attributes which the user has rated as important; and finally, 4) Validating the selection by reviewing the final choice in light of first stage overall factors.  相似文献   

Cross-and same-race friendships of Vietnamese immigrant adolescents: A focus on acculturation and school diversity     

Wing Yi Chan  Dina Birman 《Int J Intercult Relat》2009,33(4):313-324

The purpose of this study was to examine friendship developments of 153 Vietnamese immigrant adolescents who resided in an East Coast metropolitan area of the United States. We examined the influences of school diversity and acculturation on the quantity and quality of cross-and same-race friendships. Surprisingly, students who came from schools that are more diverse reported fewer cross-race friendships and lower levels of social support from their cross-race friends. American acculturation predicted greater levels of social support from cross-race friends. For same-race friendships, students who went to schools with higher percentage of Asian students reported more same-race friendships; however, percentage of Asian students was not a significant predictor of social support from same-race friends. Students who reported greater levels of Vietnamese acculturation reported greater levels of social support from their same-race friends. This study has implications for understanding the impact of school diversity and acculturation on friendship development of Vietnamese immigrants. Also, suggestions on how to better conceptualize and measure diversity are discussed.  相似文献   

Multimodal biomedical image indexing and retrieval using descriptive text and global feature mapping     

Matthew S. Simpson  Dina Demner-Fushman  Sameer K. Antani  George R. Thoma 《Information Retrieval》2014,17(3):229-264

The images found within biomedical articles are sources of essential information useful for a variety of tasks. Due to the rapid growth of biomedical knowledge, image retrieval systems are increasingly becoming necessary tools for quickly accessing the most relevant images from the literature for a given information need. Unfortunately, article text can be a poor substitute for image content, limiting the effectiveness of existing text-based retrieval methods. Additionally, the use of visual similarity by content-based retrieval methods as the sole indicator of image relevance is problematic since the importance of an image can depend on its context rather than its appearance. For biomedical image retrieval, multimodal approaches are often desirable. We describe in this work a practical multimodal solution for indexing and retrieving the images contained in biomedical articles. Recognizing the importance of text in determining image relevance, our method combines a predominately text-based image representation with a limited amount of visual information, in the form of quantized content-based visual features, through a process called global feature mapping. The resulting multimodal image surrogates are easily indexed and searched using existing text-based retrieval systems. Our experimental results demonstrate that our multimodal strategy significantly improves upon the retrieval accuracy of existing approaches. In addition, unlike many retrieval methods that utilize content-based visual features, the response time of our approach is negligible, making it suitable for use with large collections.  相似文献   

Do you know where your book publishing business is?     

Kosmo Kalliarekos  Tammy Battaglino  Dina Connor 《Publishing Research Quarterly》2005,20(4):14-22

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Insights fourth and fifth graders bring to multiplication and division with decimals     

Anna O. Graeber  Dina Tirosh 《Educational Studies in Mathematics》1990,21(6):565-588

This study was designed to gain information about the understandings children in Israel and the United States have about multiplication and division of whole numbers that may be useful in building accurate understandings of these operations with decimals and the extent to which they hold conceptions about these operations that may interfere with their work with decimals. Data from interviews of the fourth and fifth graders indicate that students of this age already hold misconceptions such as multiplication always makes bigger. However they also hold conceptions that are prerequisite to understanding the area model of multiplication and the measurement model of division. These early conceptions might be used to build understanding of multiplication and division by decimals. Implications for the content and sequencing of instructional activities are presented.  相似文献   

Real and perceived employability: a comparison among Italian graduates     

Luca Caricati  Rita Chiesa  Dina Guglielmi  Marco Giovanni Mariani 《Journal of Higher Education Policy & Management》2016,38(4):490-502

The research undertaken for this article aims to analyse the correspondence between perceived employability and the actual national employment rate among Italian students and graduates undertaking different courses in a large Italian university. Data were collected through a cross-sectional survey of 2087 students in 19 faculties, and compared with the national indicators of employment rate for each faculty. Using faculty as unit of analysis, the results indicated a significant correlation between participants’ perceived employability and national employment rate. This trend was similar for both genders. However, the results showed a difference between bachelor’s and master’s degrees: the correlation between perceived and actual employability was not significant among bachelor’s participants while it remained significant among master’s participants. The results suggest that graduates are only partially aware of their possibility to enter the labour market and this, in turn, highlights that universities have only partially met the goal to increase awareness about the chances of finding a job among students and graduates.  相似文献   

Infinity – The never-ending struggle     

David Tall  Dina Tirosh 《Educational Studies in Mathematics》2001,48(2-3):129-136

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