排序方式： 共有54条查询结果，搜索用时 32 毫秒
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Minjeong Kim Jeeheon Ryu 《Educational technology research and development : ETR & D》2013,61(4):549-561
An assessment was conducted of a web-based formative peer assessment system (WFPAS) emphasizing learners’ metacognitive awareness for their performance in ill-structured tasks. Results indicate that the WFPAS group achieved significantly higher scores for metacognitive awareness and performance in ill-structured tasks than the traditional peer assessment group and that a traditional peer assessment group achieved higher scores for metacognitive awareness than a self-assessment group. In addition, the WFPAS group showed significantly higher scores in motivation than the traditional peer assessment group. Results are explained from the perspective of peer interaction and scaffolding. The potential challenges and implications of the WFPAS are discussed. 相似文献
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As exhibitions are known to play important roles in marketing and sales promotion, the exhibition industry has grown significantly not only in the exhibition event size and frequency but also in the number of participating firms and visitors. While the challenge in assessing economic returns from exhibitions is being studied, it is agreed that the eventual success of an exhibition resides largely in its ability to meet the visitors’ needs. Visitors use an exhibition as a source of information when searching for products or services. Though an exhibition provides an information-rich environment, however, visitors often get lost in the abundance of information. A specialized recommender system can be a good solution to information overload as it can guide visitors to right exhibition booths and help them collect necessary information. Traditional collaborative-filtering recommender systems, however, use only customers’ rating or purchase records so that they do not capture exhibition visitors’ temporal visit sequences and dynamic preferences. Moreover, due to the computation overhead, they cannot generate real-time recommendation in ubiquitous environments for exhibitions. In order to overcome these drawbacks, this study proposes a booth recommendation procedure that takes into consideration not only booth visit records but also visit sequences. Experiment results show that the proposed procedure achieves higher recommendation accuracy, faster computation, and more diversity than a typical collaborative-filtering recommender system. From the results, we conclude that the proposed booth recommendation procedure is suitable for real-time recommendation in ubiquitous exhibition environments. 相似文献
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Ryu Nagahara Mirai Mizutani Akifumi Matsuo Hiroaki Kanehisa Tetsuo Fukunaga 《Journal of sports sciences》2018,36(12):1392-1401
We aimed to investigate the step-to-step spatiotemporal variables and ground reaction forces during the acceleration phase for characterising intra-individual fastest sprinting within a single session. Step-to-step spatiotemporal variables and ground reaction forces produced by 15 male athletes were measured over a 50-m distance during repeated (three to five) 60-m sprints using a long force platform system. Differences in measured variables between the fastest and slowest trials were examined at each step until the 22nd step using a magnitude-based inferences approach. There were possibly–most likely higher running speed and step frequency (2nd to 22nd steps) and shorter support time (all steps) in the fastest trial than in the slowest trial. Moreover, for the fastest trial there were likely–very likely greater mean propulsive force during the initial four steps and possibly–very likely larger mean net anterior–posterior force until the 17th step. The current results demonstrate that better sprinting performance within a single session is probably achieved by 1) a high step frequency (except the initial step) with short support time at all steps, 2) exerting a greater mean propulsive force during initial acceleration, and 3) producing a greater mean net anterior–posterior force during initial and middle acceleration. 相似文献
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A group recommendation system for online communities 总被引：1，自引：0，他引：1
Jae Kyeong Kim Hyea Kyeong Kim Hee Young Oh Young U. Ryu 《International Journal of Information Management》2010
Online communities are virtual spaces over the Internet in which a group of people with similar interests or purposes interact with others and share information. To support group activities in online communities, a group recommendation procedure is needed. Though there have been attempts to establish group recommendation, they focus on off-line environments. Further, aggregating individuals’ preferences into a group preference or merging individual recommendations into group recommendations—an essential component of group recommendation—often results in dissatisfaction of a small number of group members while satisfying the majority. To support group activities in online communities, this paper proposes an improved group recommendation procedure that improves not only the group recommendation effectiveness but also the satisfaction of individual group members. It consists of two phases. The first phase was to generate a recommendation set for a group using the typical collaborative filtering method that most existing group recommendation systems utilize. The second phase was to remove irrelevant items from the recommendation set in order to improve satisfaction of individual members’ preferences. We built a prototype system and performed experiments. Our experiment results showed that the proposed system has consistently higher precision and individual members are more satisfied. 相似文献
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Myungjin Jung Liye Zou Jane Jie Yu Seungho Ryu Zhaowei Kong Lin Yang Minsoo Kang Jingyuan Lin Hong Li Lee Smith Paul D. Loprinzi 《运动与健康科学(英文)》2020,9(6):562-577
ObjectiveThis study aimed to examine (1) the independent effects of hypoxia on cognitive function and (2) the effects of exercise on cognition while under hypoxia.MethodsDesign: Systematic review with meta-analysis. Data sources: PubMed, Scopus, Web of Science, PsychInfo, and SPORTDiscus were searched. Eligibility criteria for selecting studies: randomized controlled trials and nonrandomized controlled studies that investigated the effects of chronic or acute exercise on cognition under hypoxia were considered (Aim 2), as were studies investigating the effects of hypoxia on cognition (Aim 1).ResultsIn total, 18 studies met our inclusionary criteria for the systematic review, and 12 studies were meta-analyzed. Exposure to hypoxia impaired attentional ability (standardized mean difference (SMD) = –0.4), executive function (SMD = –0.18), and memory function (SMD = –0.26), but not information processing (SMD = 0.27). Aggregated results indicated that performing exercise under a hypoxia setting had a significant effect on cognitive improvement (SMD = 0.3, 95% confidence interval: 0.14 – 0.45, I2 = 54%, p < 0.001). Various characteristics (e.g., age, cognitive task type, exercise type, exercise intensity, training type, and hypoxia level) moderated the effects of hypoxia and exercise on cognitive function.ConclusionExercise during exposure to hypoxia improves cognitive function. This association appears to be moderated by individual and exercise/hypoxia-related characteristics. 相似文献
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While university‐level education is increasingly recognized as an important component of sustainable approaches to development, little empirical research has been done on the impact of sustainability education on student behavior. This study relies on an evidence‐based research approach to better understand how graduate coursework on sustainable development can facilitate learning and transform the perceptions and reported behavior of class participants. Specifically, the authors use ecological footprint analysis in an interdisciplinary graduate‐level course on sustainable development to make statistical conclusions about the degree to which education on sustainability influences students’ daily consumption patterns. The results of this study suggest that graduate‐level education can significantly increase the degree to which students behave in a sustainable manner as measured by their ecological footprints. 相似文献
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The accurate viscosity measurement of complex fluids is essential for characterizing fluidic behaviors in blood vessels and in microfluidic channels of lab-on-a-chip devices. A microfluidic platform that accurately identifies biophysical properties of blood can be used as a promising tool for the early detections of cardiovascular and microcirculation diseases. In this study, a flow-switching phenomenon depending on hydrodynamic balancing in a microfluidic channel was adopted to conduct viscosity measurement of complex fluids with label-free operation. A microfluidic device for demonstrating this proposed method was designed to have two inlets for supplying the test and reference fluids, two side channels in parallel, and a junction channel connected to the midpoint of the two side channels. According to this proposed method, viscosities of various fluids with different phases (aqueous, oil, and blood) in relation to that of reference fluid were accurately determined by measuring the switching flow-rate ratio between the test and reference fluids, when a reverse flow of the test or reference fluid occurs in the junction channel. An analytical viscosity formula was derived to measure the viscosity of a test fluid in relation to that of the corresponding reference fluid using a discrete circuit model for the microfluidic device. The experimental analysis for evaluating the effects of various parameters on the performance of the proposed method revealed that the fluidic resistance ratio (RJL/RL, fluidic resistance in the junction channel (RJL) to fluidic resistance in the side channel (RL)) strongly affects the measurement accuracy. The microfluidic device with smaller RJL/RL values is helpful to measure accurately the viscosity of the test fluid. The proposed method accurately measured the viscosities of various fluids, including single-phase (Glycerin and plasma) and oil-water phase (oil vs. deionized water) fluids, compared with conventional methods. The proposed method was also successfully applied to measure viscosities of blood with varying hematocrits, chemically fixed RBCS, and channel sizes. Based on these experimental results, the proposed method can be effectively used to measure the viscosities of various fluids easily, without any fluorescent labeling and tedious calibration procedures. 相似文献
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This paper deals with the problem of delay-dependent stability analysis for neural networks with time-varying delays. First, by constructing an augmented Lyapunov–Krasovskii functional and utilizing a generalized free-weighting matrix integral inequality, an improved stability criterion for the concerned network is derived in terms of linear matrix inequalities. Second, by considering a marginal augmented vector and modifying a Lyapunov–Krasovsii functional, a further enhanced stability criterion is presented. Third, a less conservative stability condition in which a relaxed inequality related to activation functions is added is introduced. Finally, three numerical examples are included to illustrate the advantage and validity of the proposed criteria. 相似文献
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Jungsu Ryu Hyunmin Yang Amy Chan Hyung Kim Kyung Min Kim 《Educational gerontology》2018,44(2-3):128-138
For older adults, participating in leisure activities has psychosocial benefits, increases social interactions, and promotes well-being. Among various leisure activities, pickleball is an activity that fosters positive social interaction and health benefits in older adults. Pickleball is regarded as one of the fastest growing sports in the USA, and it is reported to be popular among people of all ages, especially among older adults. The purpose of this study was to gather demographic details of older pickleball participants and elucidate the psychosocial benefits of playing the sport, such as life satisfaction, optimism, and social integration. To this end, we gathered information from 153 older adults who competed in pickleball tournaments. Multivariate analysis of variance and Hotelling’s T2 test were used to compare the differences that emerged in experiential factors such as life satisfaction, optimism, and social integration among the different demographic characteristics. The results showed that life satisfaction was significantly different among the following three age groups: 50–59 years, 60–69 years, and ≥70 years. Results of Hotelling’s T2 test showed a significant difference in social integration between male and female participants. The test also revealed a significant difference in terms of life satisfaction between retired and employed participants. The results suggest that playing pickleball can be an enriching leisure activity for retirees and may help them cope with the transition that retirement typically entails. 相似文献