排序方式： 共有33条查询结果，搜索用时 15 毫秒
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James R. Segedy John S. Kinnebrew Gautam Biswas 《Educational technology research and development : ETR & D》2013,61(1):71-89
Betty’s Brain is an open-ended learning environment in which students learn about science topics by teaching a virtual agent named Betty through the construction of a visual causal map that represents the relevant science phenomena. The task is complex, and success requires the use of metacognitive strategies that support knowledge acquisition, causal map construction, and progress monitoring. Previous research has established that middle school students struggle at such tasks without proper scaffolding and feedback. In Betty’s Brain, this feedback is provided by Betty and Mr. Davis, another virtual agent designed to provide guidance and suggestions as students work. This paper discusses our implementation of contextualized conversational (CC) feedback, and then presents the results of an experimental study exploring the effects of this feedback in two 8th-grade science classrooms. The results illustrate some advantages of the CC feedback in comparison with a baseline dialogue mechanism that presents similar strategies in a non-conversational, non-contextualized form. While both groups showed significant pre-to-post test learning gains, the difference in learning gains between the groups was not statistically significant. However, students who received CC feedback more often performed actions in accordance with the advised strategies, and they created higher quality causal maps. 相似文献
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Anindya Kumar Biswas 《Resonance》2018,23(6):663-668
In this pedagogical article, we elucidate the direct derivation of total power emitted by an accelerating charged particle, known as Liénard’s generalisation, using differentiation under integral sign technique. 相似文献
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Goals and plans organize much of complex problem solving behavior and are often inferable from action sequences. This paper addresses the strengths and limitations of inferring goals and plans from information that can be derived from computer traces of software used to solve mathematics problems. We examined mathematics problem solving activity about distance, rate, time relationships in a computer software environment designed to support understanding of functional relationships among these variables (e.g., distance =rate × time; time=distance/rate) using graphical representations of the results of simulations. Ten adolescent-aged students used the software to solve two distance, rate, time problems, and provided think-aloud protocols. To determine the inferability of understanding from the action traces, coders analyzed students' understanding from the computer traces alone (Trace-only raters) and compared these to analyses based on the traces plus the verbal protocols (Traceplus raters). Inferability of understanding from the action traces was related to level of student understanding how they used the graphing tool. When students had a good understanding of distance, rate, time relationships, it could be accurately inferred from the computer traces if they used the simulation tool in conjunction with the graphing tool. When students had a weak understanding, the verbal protocols were necessary to make accurate inferences about what was and was not understood. The computer trace also failed to capture dynamic exploration of the visual environment so students who relied on the graphing tool were inaccurately characterized by the Trace-only coders. Discussion concerns types of scaffolds that would be helpful learning environment for complex problems, the kind of information that is needed to adequately track student understanding in this content domain, and instructional models for integrating learning environments like these into classrooms.Members of the Cognition and Technology Group at Vanderbilt who have contributed to this project are (in alphabetical order) Helen Bateman, John Bransford, Thaddeus Crews, Allison Moore, Mitchell Nathan, and Stephen Owens. The research was supported, in part, by grants from the National Science Foundation (NSF-MDR-9252990) but no official endorsement of the ideas expressed herein should be inferred. 相似文献
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The generalized diffusion equations, with nonlinear source terms which encompasses the Fisher, Newell-Whitehead, FitzHugh-Nagumo and Allen-Cahn equations as particular forms are solved by the G′/G-expansion method. The exact solutions are in terms of hyperbolic, trigonometric and rational functions with external parameters. This paper concludes with the stationary topological soliton solution of the FitzHugh-Nagumo equation that is obtained by the Ansatz method. 相似文献
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Alexander H. K. Montoye Bo Dong Subir Biswas Karin A. Pfeiffer 《Journal of sports sciences》2016,34(21):2130-2139
The purpose of this study was to validate a wireless network of accelerometers and compare it to a hip-mounted accelerometer for predicting energy expenditure in a semi-structured environment. Adults (n = 25) aged 18–30 engaged in 14 sedentary, ambulatory, exercise, and lifestyle activities over a 60-min protocol while wearing a portable metabolic analyser, hip-mounted accelerometer, and wireless network of three accelerometers worn on the right wrist, thigh, and ankle. Participants chose the order and duration of activities. Artificial neural networks were created separately for the wireless network and hip accelerometer for energy expenditure prediction. The wireless network had higher correlations (r = 0.79 vs. r = 0.72, P < 0.01) but similar root mean square error (2.16 vs. 2.09 METs, P > 0.05) to the hip accelerometer. Measured (from metabolic analyser) and predicted energy expenditure from the hip accelerometer were significantly different for the 3 of the 14 activities (lying down, sweeping, and cycle fast); conversely, measured and predicted energy expenditure from the wireless network were not significantly different for any activity. In conclusion, the wireless network yielded a small improvement over the hip accelerometer, providing evidence that the wireless network can produce accurate estimates of energy expenditure in adults participating in a range of activities. 相似文献
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Shampa Paul 《International Information and Library Review》2012,44(4):194-201
The Information Age is characterized by new ways of information generation, managing, and dissemination because of the use of information and communication technology (ICT) (Moahi, 2003; Paul, 2007). Institutional Repositories (IRs) play a fundamental role in centralizing, preserving, and making accessible institution's intellectual capital and, at the same time, they form part of a global system of distributed and interoperable repositories that provide the foundation for a new disaggregated model of scholarly publishing (Johnson, 2002; Nagahban, 2010). A study of nine libraries in the National Capital Region of India was conducted to: identify benefits of IRs, learn the satisfaction level of users with respect to IR facilities, identify the incentives for publication in IRs, and identify the appropriate policies to be adopted by institutions for implementing IRs. The results of the responses from the 496 respondents indicate that: 1) Most Faculty members and Research scholars in this study indicated that they do not publish their research in IRs. 2) Opinions about benefits of IRs are user-specific. For instance, a substantially large percentage of those Faculty members and Research scholars in the study who do use IRs are Most satisfied with potential benefits of IR while a relatively higher percentage of Students fall in the Satisfied category. 3) The benefits of IRs ranked most highly, although this varied by the different user groups was wider readership. Students ranked this and "quality aspect" – the opportunity to improve the quality of one's work through the provision of feedback from other researchers. 4) A serious concern about publishing in IRs is the potential for plagiarism and overall lower control over one's work. A second concern is the potential loss of content in IRs, which are often not archived as well as scholarly journals are. The findings suggest that institutions need to give due attention to policies related to two aspects of publication, especially those related to quality and copyright issues and to the academic value of research output. Other policy-related topics include citation in other publication with due acknowledgement, inclusion in indexing systems for retrieval, interoperability with other IRs, and Permanent storage. 相似文献
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Shampa Paul 《International Information and Library Review》2013,45(4):194-201
The Information Age is characterized by new ways of information generation, managing, and dissemination because of the use of information and communication technology (ICT) (Moahi, 2003; Paul, 2007). Institutional Repositories (IRs) play a fundamental role in centralizing, preserving, and making accessible institution's intellectual capital and, at the same time, they form part of a global system of distributed and interoperable repositories that provide the foundation for a new disaggregated model of scholarly publishing (Johnson, 2002; Nagahban, 2010). A study of nine libraries in the National Capital Region of India was conducted to: identify benefits of IRs, learn the satisfaction level of users with respect to IR facilities, identify the incentives for publication in IRs, and identify the appropriate policies to be adopted by institutions for implementing IRs. The results of the responses from the 496 respondents indicate that: 1) Most Faculty members and Research scholars in this study indicated that they do not publish their research in IRs. 2) Opinions about benefits of IRs are user-specific. For instance, a substantially large percentage of those Faculty members and Research scholars in the study who do use IRs are Most satisfied with potential benefits of IR while a relatively higher percentage of Students fall in the Satisfied category. 3) The benefits of IRs ranked most highly, although this varied by the different user groups was wider readership. Students ranked this and "quality aspect" – the opportunity to improve the quality of one's work through the provision of feedback from other researchers. 4) A serious concern about publishing in IRs is the potential for plagiarism and overall lower control over one's work. A second concern is the potential loss of content in IRs, which are often not archived as well as scholarly journals are. The findings suggest that institutions need to give due attention to policies related to two aspects of publication, especially those related to quality and copyright issues and to the academic value of research output. Other policy-related topics include citation in other publication with due acknowledgement, inclusion in indexing systems for retrieval, interoperability with other IRs, and Permanent storage. 相似文献
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Shampa Paul 《International Information and Library Review》2013,45(3-4):176-184
Information communication technology (ICT) in government agencies as well as educational and research institutions facilitates an efficient, speedy and transparent dissemination of information to the public and other agencies for performance of government administration activities. The importance of ICT in governance has been recognized the world over. E-governance highlights several elements of good governance such as transparency, accountability, participation, social integration, public financial management reform and development. This study is based on research and personal interviews of selected representatives of the Government of National Capital Territory of Delhi. The findings of this study highlight the role of Internet, particularly the World Wide Web (WWW), which has made it easier for citizens to locate and download official information and to conduct transactions. Information management agencies such as libraries and knowledge centres play a vital role in supporting transparent and accountable governance in this digital era. E-government needs to be integrated into the broader public management framework so as to make a substantial change in the government to citizen (G2C) relationship. 相似文献