Visual displays and contextual presentations in computer-based instruction     

Ok-choon Park 《Educational technology research and development : ETR & D》1998,46(3):37-50

The effects of two instructional strategies, visual display and contextual presentation, were investigated in the acquisition of electronic troubleshooting skills using computer-based instruction. Three types of visual displays (animation, static graphics with motion cues, and static graphics without motion cues) were used to represent structures and functions of electronic circuits and trouble-shooting procedures. The first hypothesis was that animation would be more effective than static graphics, but that static graphics with adequate motional cues representing the dynamic aspects of the task would accomplish results similar to animation. Results supported this hypothesis. The second hypothesis was that context-dependent instruction would be more efficient than context-independent instruction for solving problems in similar contexts, but that context independent instruction would be more effective in solving problems encountered in different contexts. The results supported this hypothesis. A general conclusion of this study is that the use of visual displays and contextual presentation should be based on the learning requirements of the task and the expected roles of the strategy in the learning.When this study was conducted, he was with the U.S. Army Research Institute. The opinions expressed herein are the author's and do not express or imply the views of the U.S. Department of Education or the U.S. Army Research Institute.  相似文献   

Effect of citrulline on post-exercise rating of perceived exertion,muscle soreness,and blood lactate levels: A systematic review and meta-analysis     

Hye Chang Rhim  Sung Jong Kim  Jewel Park  Ki-Mo Jang 《运动与健康科学(英文)》2020,9(6):553-561

BackgroundCitrulline is one of the non-essential amino acids that is thought to improve exercise performance and reduce post-exercise muscle soreness. We conducted a systematic review and meta-analysis to determine the effect of citrulline supplements on the post-exercise rating of perceived exertion (RPE), muscle soreness, and blood lactate levels.MethodsA random effects model was used to calculate the effect sizes due to the high variability in the study design and study populations of the articles included. A systematic search of PubMed, Web of Science, and ClinicalTrials.gov was performed. Eligibility for study inclusion was limited to studies that were randomized controlled trials involving healthy individuals and that investigated the acute effect of citrulline supplements on RPE, muscle soreness, and blood lactate levels. The supplementation time frame was limited to 2 h before exercise. The types and number of participants, types of exercise tests performed, supplementation protocols for L-citrulline or citrulline malate, and primary (RPE and muscle soreness) and secondary (blood lactate level) study outcomes were extracted from the identified studies.ResultsThe analysis included 13 eligible articles including a total of 206 participants. The most frequent dosage used in the studies was 8 g of citrulline malate. Citrulline supplementation significantly reduced RPE (n = 7, p = 0.03) and muscle soreness 24-h and 48-h after post-exercise (n = 7, p = 0.04; n = 6, p = 0.25, respectively). However, citrulline supplementation did not significantly reduce muscle soreness 72-h post-exercise (n = 4, p = 0.62) or lower blood lactate levels (n = 8, p = 0.17).ConclusionCitrulline supplements significantly reduced post-exercise RPE and muscle soreness without affecting blood lactate levels.  相似文献   

Two-step photolithography to fabricate multilevel microchannels     

Choi S  Park JK 《Biomicrofluidics》2010,4(4):46503

In this paper, we study the variation of the thickness of patterned microchannel features in photoresist (PR) by two-step photolithography. The final PR thickness is determined by the thickness and width of the predefined PR pattern in the first-step lithography and the thickness of the spin-coated PR film in the second-step lithography. Thickness variation is demonstrated to be an important consideration within the critical pattern width that the capillary pressure is still dominant for forming the PR film thickness. With this mechanism of two-step photolithography, we demonstrate its ability to form multilevel channel features and its use to fabricate a cross-flow filter with two different pore sizes as a microfluidic application.  相似文献   

The Influence of Social Norms on Korean Wives’ Intention to Talk with Their Husbands about the Equal Division of Housework     

Sunyoung Park  Sandi Walker Smith 《Journal of Intercultural Communication Research》2019,48(2):132-149

Currently, Korean males see the equal division of housework more positively than in the past. However, a large gap still exists between the attitude and the actual behaviour of the equal amount of housework. Interpersonal communication can be used to reduce this gap. The theory of planned behaviour and social norms approach are the theoretical frameworks that guide the study. The purpose of the study is to examine how social norms are influencing Korean wives’ intention to talk to their husbands about the equal division of housework.  相似文献   

Ubiquitous Learning Environment as a Solution to Education Problem     

ZHAO Hailan Jung-Hwan Park 《开放教育研究》2006,12(4):61-66

Ubiquitous learning means the intelligent learning environment that enables people to learn using any terminal at any place and at any time no matter what the contents may be.This is different from the existing method of learning the information through the internet or studying at specific place,such as school or library,and so on.People do not need to go to specific place at specific time to access the information that they want,but the learning information finds its way to people,which is the biggest difference from the existing method. Ubiquitous learning aims to solve current problems of education in more creative and learner-oriented way by creating an education environment where learners can learn with any terminal anytime and anywhere without regard to contents.The presentation this time would help promote the understanding of the Ubiquitous and explore the ubiquitous education environment that is capable of solving overall problems of education.In addition,it will propose a direction of ubiquitous learning scenario and the change in the educational environment.  相似文献   

Use of computer-aided instruction in combatting adult illiteracy     

Rosemarie J. Park 《Performance Improvement》1979,18(3):24-28

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Adaptive or adapted to: Sequence and reflexive thematic analysis to understand learners' self-regulated learning in an adaptive learning analytics dashboard     

Eunsung Park  Dirk Ifenthaler  Roy B. Clariana 《British journal of educational technology : journal of the Council for Educational Technology》2023,54(1):98-125

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