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RISS 인기검색어
- 검색키워드
- 저자 : Yuka Sasaki (검색결과 13 건)
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Detection of High-impact Movements in a Volleyball Match: A Cross-Sectional Study
Yasuharu Nagano(Yasuharu Nagano ),Shogo Sasaki(Shogo Sasaki ),Yuka Kose(Yuka Kose ),Hiroshi Ichikawa(Hiroshi Ichikawa ) 사피엔시아 2020 Exercise Medicine Vol.4 No.-
Objectives: Detection of the frequency or intensity of high-impact movements during volleyball match would help understand physical load causing the injuries. The present study aimed to classify different volleyball-specific high-impact movements based on the measurement of trunk acceleration in a volleyball match as a cross-sectional study. Methods: Linear accelerations of six female volleyball players were measured during a single volleyball match. The instances at which >4G and >6G of resultant acceleration was generated were detected. Movements recorded with a synchronized video were also detected and categorized. Counts (cases) and frequencies (cases/min) of the detected movements were calculated, and the resultant and each directional acceleration among the top seven volleyball-specific detected movements were compared. Results: For attackers, 361 and 97 movements were detected for the resultant acceleration thresholds over 4G and 6G, respectively. Landing, takeoff and running were the top three detected movements in both thresholds. Landing was the most frequently observed high-impact movement, and the ratio of landing over 6G was greater among all detected movements compared with the ratios of landing over 4G threshold. For receivers, 297 and 38 movements were detected for the resultant acceleration thresholds over 4G and 6G, respectively. Running, steps on the spot, and steps forward or backward were the top three detected movements. The top seven detected volleyball-specific movements generating over 4G were landing after blocking, landing after spiking, takeoff before spiking, takeoff before blocking, stationary steps during receiving, steps forward or backward during receiving and sidesteps during receiving. Resultant and vertical accelerations of landing after spiking were significantly greater than those of the other six movements (p < 0.001). Conclusions: Using the results of present study, we were able to estimate the physical load causing injuries during a real volleyball match.
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The Influence of Moodle on Students` Expressing Themselves in English Classes
( Yuka Kawasaki ),( Noritaka Tomimura ),( Kazuaki Ichizaki ),( Shigeru Ogawa ),( Hironori Sasaki ) 한국교육공학회 2014 한국교육공학회 학술대회발표자료집 Vol.2014 No.2
This study examines the effects that different methods of presenting comments or answering teacher``s questions in class have on student``s voluntary participation in classroom activities. We observed three English classes, Class 1 and Class 2, for six weeks, April through May in 2014, and Class 3 for six weeks, October through November in 2013, at a school in Hiroshima, Japan, and counted how often students gave their comments or their answers voluntarily. This school has a five year engineering course and a two-year advanced engineering course corresponding to the 10th grade through the senior year in college. The students are all engineering majors. In Class 1 and Class 2, a well-known hand-raising method was used. The students in these two classes raised their hands and gave answers or comments when their teachers asked a question or asked them to give comments. In contrast, in Class 3, a writing method with the forum module of Moodle was used. The students in this class wrote their comments in Japanese about their classmates`` presentations in English. We counted the number of students who gave answers or comments during the observation period, and calculated the ratio to the total number of students who didn``t give answers or comments at all in each class. Class 1, Class 2, and Class 3 had 29%, 15%, and 0% of non-active students, respectively. This result suggests that some students hesitate to give their comments voluntarily in a spoken format, but not in a written format using Moodle. In other words, in order to enhance students`` active participation in the classroom, we should first instruct non-active students to give their comments in a written format, and then guide them to an oral format. Moodle will be a very helpful tool to pursue this instruction.
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Sasaki, Hirotoshi,Ochiai, Naoya,Iga, Yuka Korean Society for Fluid machinery 2016 International journal of fluid machinery and syste Vol.9 No.1
By high speed Liquid Droplet Impingement (LDI) on material, fluid systems are seriously damaged, therefore, it is important for the solution of the erosion problem of fluid systems to consider the effect of material in LDI. In this study, by using an in-house fluid/material two-way coupled method which considers reflection and transmission of pressure, stress and velocity on the fluid/material interface, high-speed LDI on wet/dry material surface is simulated. As a result, in the case of LDI on wet surface, maximum equivalent stress are less than those of dry surface due to damping effect of liquid film. Empirical formula of the damping effect function is formulated with the fluid factors of LDI, which are impingement velocity, droplet diameter and thickness of liquid film on material surface.
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Hirotoshi Sasaki,Yuka Iga 한국유체기계학회 2019 International journal of fluid machinery and syste Vol.12 No.4
Liquid droplet impingement erosion occurs at the elbows in steam pipes where droplets impinge at high speed. In the actual pipe wall which numerous droplets always impinge, it is predicted that both a liquid film exists on a pipe wall surface and, on the other hand, this surface is also eroded by repeated droplet impingement. Therefore, the liquid film and roughness on the material surfaces are considered to exist mixed on the actual impinged point of droplets. In this study, by using an in-house fluid/material two-way coupled numerical method that considers reflection and transmission on the fluid/material interface, the numerical analysis of the phenomenon of liquid droplet impingement on a pitted surface with a water pool is conducted. From the analysis results, the impinged pressure at the moment of impingement is reduced by a water pool. However, as the cavitation bubbles are generated in the bottom and top of the droplet after the impingement and then the cavitation bubble of the bottom side collapses, the collapse pressure which greatly exceeds the pressure of the droplet impingement occurs, and the equivalent stress also increases greatly there. Therefore, this analysis result may indicate one reason why the erosion progresses deeply at the pit part in an actual pipe wall thinning.
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A Suggestion to Develop a Teaching Material using a Moral Dilemma Story
( Hironori Sasaki ),( Yuka Kawasaki ) 한국교육공학회 2014 한국교육공학회 학술대회발표자료집 Vol.2014 No.2
The purpose of this study is to acquire suggestions to develop a teaching material using a moral dilemma story for junior high school students to raise their level of morality. The moral dilemma story was developed based on the theory of Lawrence Kohlberg``s stages of moral development. The story, called "Unauthorized Access" was developed. The lesson was practiced with 34 students in October 2011. In the first half of the lesson, after reading the story, the teacher inquired the students to write why protagonist``s action was right or wrong. In the second half, after the discussion between both sides, the teacher requested a reevaluation. As a result of the student reasoning and having an open discussion in the lesson, it was found that the majority of students couldn``t encounter a moral dilemma. Finally, it suggested that there was a need to amend the dilemma story particularly in how the context was defined.
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Hirotoshi Sasaki,Naoya Ochiai,Yuka Iga 한국유체기계학회 2016 International journal of fluid machinery and syste Vol.9 No.1
By high speed Liquid Droplet Impingement (LDI) on material, fluid systems are seriously damaged, therefore, it is important for the solution of the erosion problem of fluid systems to consider the effect of material in LDI. In this study, by using an in-house fluid/material two-way coupled method which considers reflection and transmission of pressure, stress and velocity on the fluid/material interface, high-speed LDI on wet/dry material surface is simulated. As a result, in the case of LDI on wet surface, maximum equivalent stress are less than those of dry surface due to damping effect of liquid film. Empirical formula of the damping effect function is formulated with the fluid factors of LDI, which are impingement velocity, droplet diameter and thickness of liquid film on material surface.
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Ito, Atsushi,Kaneko, Tadashi,Miyamoto, Yuka,Ishii, Keiichiro,Fujita, Hitoshi,Hayashi, Tomonori,Sasaki, Masako Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
A new concept of "photo" -antisense method has been evaluated, where the inhibition of gene expression by the conventional antisense method is enhanced by photochemical binding between antisense oligonucleotides conjugated with photo-reactive compound and target mRNA or DNA. Fluorescein labeled oligodeoxyribonucleotides (F-DNA) was delivered to cell nuclei in the encapsulated form in multilamellar lecithin liposomes with neutral charge. F-DNA was previously shown to photo-bind to the complementary stranded DNA, and the delivery system using neutral liposome to be effective in normal human keratinocytes. In the present study, we used human kidney cancer G401.2/6TG.1 cell line to be advantageous in reproducible experiments. p53 was adopted as a target gene since antisense sequence information has been accumulated. The nuclear localization ofF-DNA was identified by comparing the fluorescence ofF-DNA with that of Hoechst 33258 under fluorescence microscope. After 7hr incubation to accumulate p53 protein induced by UV -B, p53 protein was quantified by Western blot. After 2hrs from F-DNA application, about 30% of cell population incorporated F-DNA in their nuclei with some morphological change possibly due to liposomal toxicity. Irradiation of visible light longer than 400nm from solar simulator at this time enhanced the inhibitory action of antisense F-DNA. The present results suggest that photo-antisense method is promising to control gene expression in time and space dependent manner. Further improvement of F-DNA delivery to cancer cells in the stability and toxicity is in progress. progress.
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Real-Time Strategy Video Game Experience and Visual Perceptual Learning
Kim, Yong-Hwan,Kang, Dong-Wha,Kim, Dongho,Kim, Hye-Jin,Sasaki, Yuka,Watanabe, Takeo Society for Neuroscience 2015 The Journal of neuroscience Vol.35 No.29
<P>Visual perceptual learning (VPL) is defined as long-term improvement in performance on a visual-perception task after visual experiences or training. Early studies have found that VPL is highly specific for the trained feature and location, suggesting that VPL is associated with changes in the early visual cortex. However, the generality of visual skills enhancement attributable to action video-game experience suggests that VPL can result from improvement in higher cognitive skills. If so, experience in real-time strategy (RTS) video-game play, which may heavily involve cognitive skills, may also facilitate VPL. To test this hypothesis, we compared VPL between RTS video-game players (VGPs) and non-VGPs (NVGPs) and elucidated underlying structural and functional neural mechanisms. Healthy young human subjects underwent six training sessions on a texture discrimination task. Diffusion-tensor and functional magnetic resonance imaging were performed before and after training. VGPs performed better than NVGPs in the early phase of training. White-matter connectivity between the right external capsule and visual cortex and neuronal activity in the right inferior frontal gyrus (IFG) and anterior cingulate cortex (ACC) were greater in VGPs than NVGPs and were significantly correlated with RTS video-game experience. In both VGPs and NVGPs, there was task-related neuronal activity in the right IFG, ACC, and striatum, which was strengthened after training. These results indicate that RTS video-game experience, associated with changes in higher-order cognitive functions and connectivity between visual and cognitive areas, facilitates VPL in early phases of training. The results support the hypothesis that VPL can occur without involvement of only visual areas.</P><P><B>SIGNIFICANCE STATEMENT</B> Although early studies found that visual perceptual learning (VPL) is associated with involvement of the visual cortex, generality of visual skills enhancement by action video-game experience suggests that higher-order cognition may be involved in VPL. If so, real-time strategy (RTS) video-game experience may facilitate VPL as a result of heavy involvement of cognitive skills. Here, we compared VPL between RTS video-game players (VGPs) and non-VGPs (NVGPs) and investigated the underlying neural mechanisms. VGPs showed better performance in the early phase of training on the texture discrimination task and greater level of neuronal activity in cognitive areas and structural connectivity between visual and cognitive areas than NVGPs. These results support the hypothesis that VPL can occur beyond the visual cortex.</P>
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