Effectiveness of a satellite educational television program for Ethiopian secondary education     

Sung-Wan Kim 《Distance Education》2015,36(3):419-436

This study examined the actual practice and effectiveness of a satellite educational TV program in Ethiopian secondary schools. Participants in the survey were 228 students and 63 teachers from secondary schools. The results of the data analysis indicate that Ethiopian students and teachers scored highly in the evaluation areas. Levels of students’ general satisfaction with the satellite educational TV program were not equal for the variables of location and gender. It was also found that for students, learning demand, learning content, and class management were factors affecting their satisfaction with the satellite educational TV programs. For teachers, learning content and class management were the factors. The statistical mean difference in the satisfaction with the satellite educational TV program was between students and teachers. These findings suggest that the satellite educational TV program has the possibility of improving the quality of education in Ethiopian secondary schools.  相似文献   

Empowering Prospective Teachers to Become Active Sense-Makers: Multimodal Modeling of the Seasons     

Kim  Mi Song 《Journal of Science Education and Technology》2015,24(5):610-627

Situating science concepts in concrete and authentic contexts, using information and communications technologies, including multimodal modeling tools, is important for promoting the development of higher-order thinking skills in learners. However, teachers often struggle to integrate emergent multimodal models into a technology-rich informal learning environment. Our design-based research co-designs and develops engaging, immersive, and interactive informal learning activities called “Embodied Modeling-Mediated Activities” (EMMA) to support not only Singaporean learners’ deep learning of astronomy but also the capacity of teachers. As part of the research on EMMA, this case study describes two prospective teachers’ co-design processes involving multimodal models for teaching and learning the concept of the seasons in a technology-rich informal learning setting. Our study uncovers four prominent themes emerging from our data concerning the contextualized nature of learning and teaching involving multimodal models in informal learning contexts: (1) promoting communication and emerging questions, (2) offering affordances through limitations, (3) explaining one concept involving multiple concepts, and (4) integrating teaching and learning experiences. This study has an implication for the development of a pedagogical framework for teaching and learning in technology-enhanced learning environments—that is empowering teachers to become active sense-makers using multimodal models.

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Testing After Worked Example Study Does Not Enhance Delayed Problem-Solving Performance Compared to Restudy     

Tamara van Gog  Liesbeth Kester  Kim Dirkx  Vincent Hoogerheide  Joris Boerboom  Peter P. J. L. Verkoeijen 《Educational Psychology Review》2015,27(2):265-289

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Instructional leadership practices in Singapore   总被引：1，自引：0，他引：1  

Foo Seong David Ng  Thanh Dong Nguyen  Koon Siak Benjamin Wong  Kim Weng William Choy 《School Leadership & Management》2015,35(4):388-407

This paper presents a review of the literature on principal instructional leadership in Singapore. The authors investigated the dimensions of instructional leadership in the practices of Singapore principals and highlighted the strategies these leaders adopt to enact their instructional roles. Singapore principals were found to play an active role in defining the school vision and promoting the school climate. However, in the areas of curriculum implementation and classroom instruction, the middle management team in the school played more active roles as compared to principals. Five broad conclusions were discussed to provide perspectives on instructional leadership practices in Singapore. This paper also highlighted limitations on current instructional leadership research in Singapore and pointed to areas of future research.  相似文献   

Dialogue with a conversational agent promotes children’s story comprehension via enhancing engagement     

Ying Xu  Joseph Aubele  Valery Vigil  Andres S. Bustamante  Young-Suk Kim  Mark Warschauer 《Child development》2022,93(2):e149-e167

Dialogic reading, when children are read a storybook and engaged in relevant conversation, is a powerful strategy for fostering language development. With the development of artificial intelligence, conversational agents can engage children in elements of dialogic reading. This study examined whether a conversational agent can improve children's story comprehension and engagement, as compared to an adult reading partner. Using a 2 (dialogic reading or non-dialogic reading) × 2 (agent or human) factorial design, a total of 117 three- to six-year-olds (50% Female, 37% White, 31% Asian, 21% multi-ethnic) were randomly assigned into one of the four conditions. Results revealed that a conversational agent can replicate the benefits of dialogic reading with a human partner by enhancing children's narrative-relevant vocalizations, reducing irrelevant vocalizations, and improving story comprehension.  相似文献   

Strategies for overcoming the digital divide during the COVID-19 pandemic in higher education institutions in Ghana     

Alex Kumi-Yeboah  YangHyun Kim  Yaa Essah Armah 《British journal of educational technology : journal of the Council for Educational Technology》2023,54(6):1441-1462

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Government support for SME innovations in the regional industries: The case of government financial support program in South Korea     

Soogwan Doh  Byungkyu Kim 《Research Policy》2014

This study explores the impact of governmental support policies on the innovation of SMEs in the regional strategic industries in South Korea. We use the technological development assistance funds as a proxy for governmental support policies for SMEs in the regional industries in Korea. The innovation of SMEs is measured by technological innovation: patent, utility model, trademark, and new design registrations. Before empirically testing the impact of governmental support policies on the innovation of SMEs, this study reviews the literature concerning the innovation and the governmental support policies of SMEs in regional industries. Results from empirical models, which simultaneously control for factors which were thought to affect the innovation of regional SMEs, indicate that a positive relationship exists among the technological development assistance by the Korean government and patent acquisitions and new design registrations of regional SMEs. Networks with universities also have a positive relationship with patent acquisitions and new design registrations of regional SMEs. This study suggests there is an importance to governmental financial aids for regional SME innovations, and there is an importance to the need to build a strong social relationship in today's networked economy.  相似文献   

Dual-mode on-demand droplet routing in multiple microchannels using a magnetic fluid as carrier phase     

Jitae Kim  June Won  Simon Song 《Biomicrofluidics》2014,8(5)

We present dual-mode, on-demand droplet routing in a multiple-outlet microfluidic device using an oil-based magnetic fluid. Magnetite (Fe₃O₄) nanoparticle-contained oleic acid (MNOA) was used as a carrier phase for droplet generation and manipulation. The water-in-MNOA droplets were selectively distributed in a curved microchannel with three branches by utilizing both a hydrodynamic laminar flow pattern and an external magnetic field. Without the applied magnetic field, the droplets travelled along a hydrodynamic centerline that was displaced at each bifurcating junction. However, in the presence of a permanent magnet, they were repelled from the centerline and diverted into the desired channel when the repelled distance exceeded the minimum offset allocated to the channel. The repelled distance, which is proportional to the magnetic field gradient, was manipulated by controlling the magnet''s distance from the device. To evaluate routing performance, three different sizes of droplets with diameters of 63, 88, and 102 μm were directed into designated outlets with the magnet positioned at varying distances. The result demonstrated that the 102-μm droplets were sorted with an accuracy of ∼93%. Our technique enables on-demand droplet routing in multiple outlet channels by simply manipulating magnet positions (active mode) as well as size-based droplet separation with a fixed magnet position (passive mode).  相似文献   

Programmed sample delivery on a pressurized paper     

Joong Ho Shin  Juhwan Park  Seung Hoon Kim  Je-Kyun Park 《Biomicrofluidics》2014,8(5)

This paper reports a method to control the fluid flow in paper-based microfluidic devices simply by pressing over the channel surface of paper, thereby decreasing the pore size and permeability of a non-woven polypropylene sheet. As a result, fluid resistance is increased in the pressed region and causes flow rate to decrease. We characterize the decrease of flow rate with respect to different amounts of pressure applied, and up to 740% decrease in flow velocity was achieved. In addition, we demonstrate flow rate control in a Y-shaped merging paper and sequential delivery of multiple color dyes in a three-branched paper. Furthermore, sequential delivery of multiple fluid samples is performed to demonstrate its application in multi-step colorimetric immunoassay, which shows a 4.3-fold signal increase via enhancement step.  相似文献   

Optofluidic microvalve-on-a-chip with a surface plasmon-enhanced fiber optic microheater     

Hyun-Tae Kim  Hyungdae Bae  Zhijian Zhang  Abisola Kusimo  Miao Yu 《Biomicrofluidics》2014,8(5)

We present an optofluidic microvalve utilizing an embedded, surface plasmon-enhanced fiber optic microheater. The fiber optic microheater is formed by depositing a titanium thin film on the roughened end-face of a silica optical fiber that serves as a waveguide to deliver laser light to the titanium film. The nanoscale roughness at the titanium-silica interface enables strong light absorption enhancement in the titanium film through excitation of localized surface plasmons as well as facilitates bubble nucleation. Our experimental results show that due to the unique design of the fiber optic heater, the threshold laser power required to generate a bubble is greatly reduced and the bubble growth rate is significantly increased. By using the microvalve, stable vapor bubble generation in the microchannel is demonstrated, which does not require complex optical focusing and alignment. The generated vapor bubble is shown to successfully block a liquid flow channel with a size of 125 μm × 125 μm and a flow rate of ∼10 μl/min at ∼120 mW laser power.  相似文献