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Zvia Kaberman Yehudit Judy Dori 《International Journal of Science and Mathematics Education》2009,7(3):597-625
A new learning unit in chemistry, Case-based Computerized Laboratories (CCL) and Computerized Molecular Modeling (CMM) was developed at the Technion. The CCL and CMM curriculum integrates computerized desktop experiments and molecular
modeling with an emphasis on scientific inquiry and case studies. Our research aimed at investigating the effect of the CCL
and CMM learning environment on students’ higher-order thinking skills of question posing, inquiry, and modeling. The experimental
group included 614 honors 12th grade chemistry students from high schools in Israel who studied according to this learning
unit. The comparison group consisted of 155 12th grade chemistry honors students who studied other chemistry programs. Pre-
and post-tests questionnaires were used to assess students’ higher-order thinking skills. Students’ responses were analyzed
using content analysis rubrics and their statistical analysis. Our findings indicated that the scores of the experimental
group students improved significantly in question posing, inquiry and modeling skills from the pre-test to the post-test.
The net gain scores of the experimental group students were significantly higher than those of their comparison peers in all
three examined skills. In modeling skills, experimental group students significantly improved their achievements in making
the transfer from 3D models to structural formulae, but only about half of them were able to transfer from formulae to 3D
models. By presenting a case-based chemistry assessment tool and content analysis of students’ responses in this paper, we
enable teachers and educators to analyze their students’ higher-order thinking skills both qualitatively and quantitatively. 相似文献
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This study examined the extent to which adultdyslexic readers exhibit concurrent deficitsfor phonological, orthographic and cross-modalword representations, and the relationshipbetween these deficits and decoding ability.Participants were 18 phonological dyslexics and19 normal readers at college level. Compared tonormal readers, dyslexics exhibitedsignificantly slower reaction times acrosstasks, and were less accurate on the unimodalorthographic task. Word pattern processing wasmore extensively related to decoding abilityamong dyslexic as compared to normal readers,but more robustly related to baseline measuresof phonological and orthographic processingamong normal readers. The results are discussedin the context of integrating the phonologicaland orthographic aspects of words, speed ofprocessing deficits, and the importance of taskselection when assessing adult dyslexicpopulations. 相似文献
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Assessing high school chemistry students’ modeling sub-skills in a computerized molecular modeling learning environment 总被引：1，自引：0，他引：1
Much knowledge in chemistry exists at a molecular level, inaccessible to direct perception. Chemistry instruction should therefore
include multiple visual representations, such as molecular models and symbols. This study describes the implementation and
assessment of a learning unit designed for 12th grade chemistry honors students. The organic chemistry part of the unit was
taught in a Computerized Molecular Modeling (CMM) learning environment, where students explored daily life organic molecules
through assignments and two CMM software packages. The research objective was to investigate the effect of the CMM learning
unit on students’ modeling skill and sub-skills, including (a) drawing and transferring between a molecular formula, a structural
formula, and a model, and (b) transferring between symbols/models and microscopic, macroscopic, and process chemistry understanding
levels. About 600 12th grade chemistry students who studied the CMM unit responded to a reflection questionnaire, and were
assessed for their modeling skill and sub-skills via pre- and post-case-based questionnaires. Students indicated that the
CMM environment contributed to their understanding of the four chemistry understanding levels and the links among them. Students
significantly improved their scores in the five modeling sub-skills. As the complexity of the modeling assignments increased,
the number of students who responded correctly and fully decreased. We present a hierarchy of modeling sub-skills, starting
with understanding symbols and molecular structures, and ending with mastering the four chemistry understanding levels. We
recommend that chemical educators use case-based tools to assess their students’ modeling skill and validate the initial hierarchy
with a different set of questions. 相似文献
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ABSTRACTThe current study focused on scaffolding programmes, including cognitive and meta-cognitive components, for science problem solving in a computerised learning environment to identify their unique effects on aspects of student motivation. Using expectancy-value theory as a conceptual framework, the current study focused on two motivational aspects: intrinsic value and perceived cost. Four scaffolding components were identified (structural, reflective, subject matter and enrichment) and used in different configurations to construct four scaffolding programmes ranging from low support (Enrichment) to partial support (Operative and Strategic) to full support (Integrated). The participants were seventh-grade students (N?=?458) sampled from 15 different classes in 3 middle schools. The classes were randomly assigned to the five treatment groups (four ‘scaffolding programmes’ and one control). The intervention was conducted over approximately 6 months as part of the regular class curriculum. The first phase of the study was based on self-report surveys distributed twice to all participants, and the second phase was based on observations of a sub-sample (N?=?145). The findings indicated that the integrated group demonstrated the most adaptive patterns of motivation. Specifically, the integrated group was the only group that showed no decline in intrinsic value or increases in perceived cost. Both the strategic and integrated groups had higher levels of observed willingness to invest effort and reports of intentional learning when using the scaffolding software. The common feature of these groups is the reflection component, which implies that reflection and its combination with subject matter have positive effects on motivation. 相似文献
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Dan Breznitz 《Research Policy》2007,36(9):1465-1482
The Israeli software industry has been an indisputable success since the 1990s. This paper utilizes the development of the Israeli industry to empirically explore the argument of the horizontal technology policies (HTP) framework on the impact of neutral science and technology policies on industrial development. The paper micro-analyzes the Israeli software industry and compares its unique historical development pattern with other emerging countries. It describes (1) the rise of this industry as one outcome of the development of the entire IT industry in Israel; (2) the reasons behind the industry's ability to conduct and focus on intensive R&D activities; (3) the industry's success in becoming an integral part of the American financial and IT industrial sector. It argues that only by understanding the intricate co-evolution of state-industry relations and the specific HTP regime employed in Israel can we understand the current behavior, conditions, business models, and capability of the industry. Therefore, the argument is that Israel's industrial science and technology developmental agencies did not aim at creating a software industry, but rather at the development of novel products R&D-based industry. However, the software industry has been significantly influenced throughout its development by the specific system of innovation which these policies fostered. Thus, the paper argues that public policy is one of the main reasons why the industry has focused almost entirely on product R&D activities. In addition, the paper suggests that the state's science and technology industrial policy has propelled the industry into its intimate relationship with the American financial sector. 相似文献
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Zvia Breznitz 《Reading and writing》2002,15(1-2):15-42
This study investigated whether asynchrony ofspeed of processing (SOP) betweenvisual-orthographic and auditory-phonologicalmodalities can account for word recognitiondeficits among dyslexic readers. SOP amongelementary school dyslexic readers was comparedto that of chronologically age-matched normalreaders. SOP was assessed using nonlinguisticand linguistic auditory and visual low-leveltasks and higher-level orthographic andphonological tasks. Behavioral andelectrophysiological (ERP) measures of SOP wereobtained. Data indicated that dyslexic readerswere significantly slower than control readersin most of the experimental tasks. Moreover,dyslexics revealed a systematic SOP gap betweenthe auditory-phonological and thevisual-orthographic modalities. This gap wasfound in both P200 and P300 latencies, andexplained most of the variance in wordrecognition. A theory is proposed suggestingthat asynchrony between the processing rates ofthe visual and the auditory modalities may bean underlying cause of dyslexia. 相似文献