排序方式： 共有25条查询结果，搜索用时 15 毫秒
11.
12.
Background: One of the most important goals of science education is to enable students to understand the nature of science (NOS). However, generally regular science teaching in classrooms does not help students improve informed NOS views.
Purpose: This study investigated the influence of an explicit reflective conceptual change approach compared with an explicit reflective inquiry-oriented approach on seventh graders’ understanding of NOS.
Sample: The research was conducted with seventh grade students. A total of 44 students participated in the study.
Design and method: The study was an interpretive study because this study focused on the meanings that students attach to target aspects of NOS. Participants were divided into two groups, each consisting of 22 students. One of the groups learned NOS with an explicit reflective conceptual change approach. The requirements of conceptual change were provided through the use of conceptual change texts and concept cartoons. The other group learned NOS with an explicit reflective inquiry-oriented approach. The data were collected through open-ended questionnaires and semi-structured interviews. These instruments were employed in a pre-test, a post-test and a delayed test. Students’ views of the aspects of NOS were categorized as naive, transitional and informed.
Results: The result of this study indicated that before receiving instruction, most of the participants had transitional views of the tentative, empirical and imaginative and creative aspects of the NOS, and they had naive understandings of the distinction between observation and inference. The instruction in the experimental group led to a 60% – a 25% increase in the number of students who possessed an informed understanding of the tentative, empirical, creative and observation and inference aspect of the NOS. The instruction in the control group led to a 30% – a 15% increase in the informed NOS views.
Conclusion: The explicit reflective conceptual change approach is more effective than the explicit reflective inquiry-oriented approach in improving participants’ NOS conceptions. Another conclusion of this study is that if NOS is taught within the explicit reflective conceptual change approach, learners can retain learned views long after instruction. 相似文献
13.
OBJECTIVE: To conceptualize the underlying causes of the medical neglect of children in a developing country and to provide suggestions for the management of neglect by pediatricians. METHODS: A case history of a 4-year-old boy from Turkey with neglect of the required treatment for acute lymphoblastic leukemia is used to examine the causes and management of medical neglect. Results: Although epidemiological studies on child neglect are lacking, this case exemplifies how in DEVELOPING countries, reasons for neglect or non-compliance with medical recommendations and the roles and actions taken by the health care and the social service systems may differ from western populations. Common to both western and developing countries, the characteristics of the child, family, and society may be reasons for medical neglect. However, cultural fatalistic beliefs profoundly present in the developing world may also contribute to the medical neglect of a child. Identification of the neglect, a comprehensive, multidisciplinary assessment emphasizing the strengths within the family and the society, and the determination of the pediatric team to act in the best interest of the child may result in resolution of the neglect even in circumstances where resources within systems are not sufficient. CONCLUSIONS: In developing countries, increased emphasis on child neglect, its prompt recognition and management within the pediatric profession as well as at a health care and social service system levels are needed to address this prevalent and potentially fatal child health problem. 相似文献
14.
This study focused on the development of a two-tier multiple-choice diagnostic instrument, which was designed and then progressively modified, and implemented to assess students' understanding of solution chemistry concepts. The results of the study are derived from the responses of 756 Grade 11 students (age 16–17) from 14 different high schools who participated in the study. The final version of the instrument included a total of 13 items that addressed the six aspects of solution chemistry, and students' understandings in the test were challenged in multiple contexts with multiple modes and levels of representation. Cronbach alpha reliability coefficients for the content tier and both tiers of the test were found to be 0.697 and 0.748, respectively. Results indicated that a substantial number of students held an inadequate understanding of solution chemistry concepts. In addition, 21 alternative conceptions observed in more than 10% of the students were reported, along with discussion on possible sources of such conceptions. 相似文献
15.
Sinem Aslan Nese Alyuz Eda Okur Sinem Emine Mete Ece Oktay Asli Arslan Esme 《Educational technology research and development : ETR & D》2018,66(6):1399-1413
The goal of this research is to investigate the effect of emotion-aware interventions on students’ behavioral and emotional states. To this end, we collected data from 12 students in the 9th grade in a high school in Turkey. The data collection took place in two sessions of an English Course. While the students were reading articles and solving relevant questions, our data collection application running in the background recorded the videos of the individual students through a camera and captured students’ screens in a non-intrusive manner. In total, we had 12.5 h of student data. We employed the human expert labeling process (HELP) (Aslan et al. in Workshop proceedings at international conference on intelligent tutoring systems (ITS), pp 156–165, 2016) to have the data labeled (150 h of data labeling in total). The data collection application was designed in a way that it also collected emotional self-labels (i.e., emotional states as self-reported by students at any time of learning). We leveraged emotional self-label information to suggest various real-time interventions for the students. The results obtained using the final expert labels showed that the percentage of the students’ Satisfied state was significantly higher after interventions. The results also demonstrated that although the interventions were triggered by the emotional states as self-labeled by the students and tailored to improve such states, there was a major positive impact of these interventions on students’ behavioral states. This preliminary study showed that even with a limited set of emotion-aware interventions based on self-labels, students’ states could be impacted positively. Conducting large-scale pilots leveraging more advanced interventions is a future direction for our research. 相似文献
16.
This study investigated the conceptual pathways of 19 Grade 11 introductory chemistry students (age 16–17) as they participated in a multirepresentational instruction on the particulate nature of matter (PNM). This study was grounded in contemporary conceptual change theory, in particular, research on students' conceptual pathways that focuses on the interaction between students' existing conceptions and instruction, which might give rise to observing multiple paths. This mixed method study combined a quantitative research design with qualitative data collection and analysis methods. Data were collected through open‐ended questionnaires, interviews, and document analysis to portray the patterns of students' conceptual pathways of the PNM from pre to postinstruction to 3 months after the instruction. An interpretive analysis of the qualitative data revealed six different conceptual pathways varying between radical progress and no additional progress (stable) after the multirepresentational instruction and between stable (no change) and full decay over a 3‐month period following the instruction. The identified patterns of conceptual pathways provide information about the manner in which conceptual change occurred, as well as suggest potential implications for instructional practices. © 2010 Wiley Periodicals, Inc. J Res Sci Teach 47: 1004–1035, 2010 相似文献
17.
Emine Adadan 《科学教学研究杂志》2020,57(2):253-278
This mixed-method study examined the influence of metacognitive awareness on the change in preservice chemistry teachers' understandings of gas behavior in the context of multirepresentational (MR) instruction. The goal was to describe the types of understanding of gas behavior held by a group of participants with high metacognitive awareness (MA) and a group with low MA before and after the MR instruction. A total of 34 preservice chemistry teachers participated in the study. Data sources included the metacognitive awareness inventory and the two-tier nature of gases diagnostic questionnaire. Data from these sources were coded and analyzed using quantitative and qualitative methods. A statistically significant difference was observed for the understanding of gas behavior before the MR instruction between the participants with high MA and those with low MA. Both groups of participants exhibited substantial progress toward a scientific understanding from pre- to post-instruction. However, the participants with high MA outperformed those with low MA in terms of developing a more scientific understanding of gas behavior after the MR instruction. In addition, following the MR instruction, while the participants with high MA eliminated 85% of their alternative conceptions, the participants with low MA eliminated only about 60% of their alternative conceptions. 相似文献
18.
Most current machine learning methods for building search engines are based on the assumption that there is a target evaluation
metric that evaluates the quality of the search engine with respect to an end user and the engine should be trained to optimize
for that metric. Treating the target evaluation metric as a given, many different approaches (e.g. LambdaRank, SoftRank, RankingSVM,
etc.) have been proposed to develop methods for optimizing for retrieval metrics. Target metrics used in optimization act
as bottlenecks that summarize the training data and it is known that some evaluation metrics are more informative than others.
In this paper, we consider the effect of the target evaluation metric on learning to rank. In particular, we question the
current assumption that retrieval systems should be designed to directly optimize for a metric that is assumed to evaluate
user satisfaction. We show that even if user satisfaction can be measured by a metric X, optimizing the engine on a training
set for a more informative metric Y may result in a better test performance according to X (as compared to optimizing the
engine directly for X on the training set). We analyze the situations as to when there is a significant difference in the
two cases in terms of the amount of available training data and the number of dimensions of the feature space. 相似文献
19.
20.
Emine Adadan Karen E. Irving Kathy C. Trundle 《International Journal of Science Education》2013,35(13):1743-1775
This quasi‐experimental study examined 42 high school introductory chemistry students’ conceptual understandings of the particulate nature of matter (PNM) before and immediately after instruction. Two groups of students, who were taught by the same teacher, received one of two possible instructional interventions: Reform‐Based Teaching (RBT) or Reform‐Based Teaching with Multiple Representations (RBTw/MR). The RBTw/MR instruction differed from the RBT instruction in terms of the frequency of using multiple representations (visual, textual, oral) in relationship to the macroscopic phenomenon and the likely actions occurring at the submicroscopic level. Qualitative research methods, including open‐ended questionnaires and interviews, were used to investigate and describe participants’ conceptual understandings of the PNM over time. The findings indicated that before instruction all participants held a range of alternative conceptions about the aspects of the PNM. Post‐instruction findings indicate that the RBTw/MR instruction was more efficacious in promoting a scientific understanding of the PNM than was the instruction without multiple representations. 相似文献