Reconceptualizing the Zone of Proximal Development: The Importance of the Third Voice     

Barohny Eun  Steven E. Knotek  Audrey L. Heining-Boynton 《Educational Psychology Review》2008,20(2):133-147

A reconceptualization of the zone of proximal development (ZPD) is proposed by introducing the notion of dialogicality and voice. Drawing on Bakhtin’s semiotics, it is argued that the dialogical interactions occurring within the ZPD must be understood in a larger context to go beyond the visible and audible participants. More specifically, in addition to the first voice of the more capable participant and the second voice of the less competent participant, there is a third voice that serves as an immediate agenda of the ZPD. The third voice exerts its influence through the first voice by mediating the latter’s intrapsychological functioning. The compatibility between the agenda of the third voice and the developmental goals of the zone determines whether the progression through the ZPD is enhanced or constrained. Standardized testing is given as an example of the third voice with a focus on its compatibility with the developmental goal of the ZPD. Barohny Eun is mainly interested in developing an instructional model for K-5 English as a Second Language (ESL) students based on the sociocultural theories of Vygotsky. Steven E. Knotek is mainly interested in early intervention and literacy. Audrey L. Heining-Boynton is mainly interested in foreign and second language education.  相似文献   

Extending the Television Brand: An Examination of Why Consumers Use Broadcast Network Web Sites     

Eun Hwa Jung  Justin Walden 《广播与电子媒介杂志》2015,59(1):94-111

Framed by the technology acceptance and customer-based brand equity (CBBE) models, this study investigated how audiences intend to use broadcast television network Web sites. Drawing upon the results of a survey (N = 178), this research found that perceived ease of use and perceived enjoyment significantly influence intent to use broadcast Web sites. Findings also reveal that CBBE plays a significant role as a mediator between motivations and behavioral intention to use broadcast networks' Web sites. It is concluded that as the medium of television evolves, networks' Web sites should be conduits for sustained brand allegiance and broadcasters should make more strategic use of their Web sites.  相似文献   

Analyzing noise-induced tracking errors in control systems with saturation: A stochastic linearization approach     

Juseung Lee  Hamid R. Ossareh  Yongsoon Eun 《Journal of The Franklin Institute》2021,358(12):6261-6280

Noise Induced Tracking Error (NITE) refers to the tracking error of the mean of the output in feedback control systems with nonlinear instrumentation subject to zero-mean measurement noise. Most of the previous work rely on the stochastic averaging for NITE analysis, the validity of which requires that the bandwidth of the zero mean measurement noise is much higher than that of the system. This is because the results obtained by stochastic averaging are asymptotic with respect to the noise bandwidth. Due to the asymptotic nature of the analysis tool, it is not straightforward to provide a quantitative argument for high bandwidth. An alternative method in the literature that can analyze NITE is stochastic linearization for random input, which is analogous to the well known describing function approach for sinusoidal input. Unlike stochastic averaging, stochastic linearization is not an asymptotic approximation. Therefore, analysis can be carried out for any given noise bandwidth. We carry out NITE analysis using stochastic linearization for a class of LPNI systems that are prone to NITE; identify the system conditions under which the averaging analysis of NITE may yield inaccurate results for a finite noise bandwidth; and prove that the results from the two methods agree as the noise bandwidth approaches infinity. In addition, an existing NITE mitigation strategy is extended based on the proposed method. Numerical examples are given to illustrate the results.  相似文献   

Scaffolding a Complex Task of Experimental Design in Chemistry with a Computer Environment     

Isabelle Girault  Cédric d’Ham 《Journal of Science Education and Technology》2014,23(4):514-526

When solving a scientific problem through experimentation, students may have the responsibility to design the experiment. When students work in a conventional condition, with paper and pencil, the designed procedures stay at a very general level. There is a need for additional scaffolds to help the students perform this complex task. We propose a computer environment (copex-chimie) with embedded scaffolds in order to help students to design an experimental procedure. A pre-structuring of the procedure where the students have to choose the actions of their procedure among pre-defined actions and specify the parameters forces the students to face the complexity of the design. However, this is not sufficient for them to succeed; they look for some feedback to improve their procedure and finally abandon their task. In another condition, the students were provided with individualized feedbacks on the errors detected in their procedures by an artificial tutor. These feedbacks proved to be necessary to accompany the students throughout their experimental design without being discouraged. With this kind of scaffold, students worked longer and succeeded better to the task than all the other students.  相似文献   

Current status,future trends,and issues in human performance technology,part 1: Influential domains,current status,and recognition of HPT     

James A. Pershing  Ji‐Eun Lee  Jing Li Cheng 《Performance Improvement》2008,47(1):9-17

Fifteen human performance technology experts participated in a survey investigating HPT's current status, future trends, and issues. Although HPT is not fully recognized in many organizations, such strengths as systems thinking and multidisciplinary approaches to performance problems are valued. Weaknesses reported are the rare use of HPT in small organizations, falling for quick fixes, and shortcomings in evaluation. HPT professionals need to do better at clarifying HPT principles, communicating HPT values, and demonstrating HPT's organizational impact.  相似文献   

Current status,future trends,and issues in human performance technology,part 2: Models,influential disciplines,and research and development     

James A. Pershing  Ji‐Eun Lee  Jingli Cheng 《Performance Improvement》2008,47(2):7-15

In this second part of a two‐part series, a panel of experts indicated that human performance technology (HPT) research is being adequately conducted but not properly used in practice. They stressed a need for more applied research and more extensive use of case studies. They also provided their perspectives about the influences of other fields on HPT, suggesting the need for HPT to align more closely with other disciplines that address issues of human and organizational performance.  相似文献   

Connecting Inquiry and Values in Science Education     

Eun Ah Lee  Matthew J. Brown 《Science & Education》2018,27(1-2):63-79

Conducting scientific inquiry is expected to help students make informed decisions; however, how exactly it can help is rarely explained in science education standards. According to classroom studies, inquiry that students conduct in science classes seems to have little effect on their decision-making. Predetermined values play a large role in students’ decision-making, but students do not explore these values or evaluate whether they are appropriate to the particular issue they are deciding, and they often ignore relevant scientific information. We explore how to connect inquiry and values, and how this connection can contribute to informed decision-making based on John Dewey’s philosophy. Dewey argues that scientific inquiry should include value judgments and that conducting inquiry can improve the ability to make good value judgments. Value judgment is essential to informed, rational decision-making, and Dewey’s ideas can explain how conducting inquiry can contribute to make an informed decision through value judgment. According to Dewey, each value judgment during inquiry is a practical judgment guiding action, and students can improve their value judgments by evaluating their actions during scientific inquiry. Thus, we suggest that students need an opportunity to explore values through scientific inquiry and that practicing value judgment will help informed decision-makings.  相似文献