研究者詳細 - 髙橋　智

論文 - 髙橋　智

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Effect of Aging on the Human Kinetic Visual Field

S.Takahashi, Z.Xu, M.Tanida, J.Wu

Neuroscience and Biomedical Engineering 4 ( 1 ) 50 - 56 2016年

Relative Position of the Fingers Affects Length Perception while Grasping Objects

S.Takahashi, Y.Ren, H.Wang, N.Kitayama, Z.Wu, J.Wu

Neuroscience and Biomedical Engineering 4 ( 1 ) 67 - 74 2016年

Effects of Sound Frequency on Audiovisual Integration: An Event-Related Potential Study

Weiping Yang, Jingjing Yang, Yulin Gao, Xiaoyu Tang, Yanna Ren, Satoshi Takahashi, Jinglong Wu

PLOS ONE 10 ( 9 ) 1 - 15 2015年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PUBLIC LIBRARY SCIENCE

A combination of signals across modalities can facilitate sensory perception. The audiovisual facilitative effect strongly depends on the features of the stimulus. Here, we investigated how sound frequency, which is one of basic features of an auditory signal, modulates audiovisual integration. In this study, the task of the participant was to respond to a visual target stimulus by pressing a key while ignoring auditory stimuli, comprising of tones of different frequencies (0.5, 1, 2.5 and 5 kHz). A significant facilitation of reaction times was obtained following audiovisual stimulation, irrespective of whether the task-irrelevant sounds were low or high frequency. Using event-related potential (ERP), audiovisual integration was found over the occipital area for 0.5 kHz auditory stimuli from 190-210 ms, for 1 kHz stimuli from 170-200 ms, for 2.5 kHz stimuli from 140-200 ms, 5 kHz stimuli from 100-200 ms. These findings suggest that a higher frequency sound signal paired with visual stimuli might be early processed or integrated despite the auditory stimuli being task-irrelevant information. Furthermore, audiovisual integration in late latency (300-340 ms) ERPs with fronto-central topography was found for auditory stimuli of lower frequencies (0.5, 1 and 2.5 kHz). Our results confirmed that audiovisual integration is affected by the frequency of an auditory stimulus. Taken together, the neurophysiological results provide unique insight into how the brain processes a multisensory visual signal and auditory stimuli of different frequencies.

DOI： 10.1371/journal.pone.0138296

Effects of Auditory Stimuli in the Horizontal Plane on Audiovisual Integration: An Event-Related Potential Study

Weiping Yang, Qi Li, Tatsuya Ochi, Jingjing Yang, Yulin Gao, Xiaoyu Tang, Satoshi Takahashi, Jinglong Wu

PLOS ONE 8 ( 6 ) e66402 2013年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PUBLIC LIBRARY SCIENCE

This article aims to investigate whether auditory stimuli in the horizontal plane, particularly originating from behind the participant, affect audiovisual integration by using behavioral and event-related potential (ERP) measurements. In this study, visual stimuli were presented directly in front of the participants, auditory stimuli were presented at one location in an equidistant horizontal plane at the front (0 degrees, the fixation point), right (90 degrees), back (180 degrees), or left (270 degrees) of the participants, and audiovisual stimuli that include both visual stimuli and auditory stimuli originating from one of the four locations were simultaneously presented. These stimuli were presented randomly with equal probability; during this time, participants were asked to attend to the visual stimulus and respond promptly only to visual target stimuli (a unimodal visual target stimulus and the visual target of the audiovisual stimulus). A significant facilitation of reaction times and hit rates was obtained following audiovisual stimulation, irrespective of whether the auditory stimuli were presented in the front or back of the participant. However, no significant interactions were found between visual stimuli and auditory stimuli from the right or left. Two main ERP components related to audiovisual integration were found: first, auditory stimuli from the front location produced an ERP reaction over the right temporal area and right occipital area at approximately 160-200 milliseconds; second, auditory stimuli from the back produced a reaction over the parietal and occipital areas at approximately 360-400 milliseconds. Our results confirmed that audiovisual integration was also elicited, even though auditory stimuli were presented behind the participant, but no integration occurred when auditory stimuli were presented in the right or left spaces, suggesting that the human brain might be particularly sensitive to information received from behind than both sides.

DOI： 10.1371/journal.pone.0066402

Development of a method to present wide-view visual stimuli in MRI for peripheral visual studies

Jinglong Wu, Bin Wang, JiaJia Yang, Yuu Hikino, Satoshi Takahashi, Tianyi Yan, Seiichiro Ohno, Susumu Kanazawa

JOURNAL OF NEUROSCIENCE METHODS 214 ( 2 ) 126 - 136 2013年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

We developed a novel wide-view visual presentation system for fMRI studies. Computer-generated images were projected onto a hemispheric, translucent screen inside the MRI bore and were then back-projected onto a 52 mm diameter screen. To achieve a wide field view, a spherical screen with a curvature radius of 30 mm was placed 30 mm away from the subjects' eyes. The subjects wore contact lenses that enabled them to focus on the screen, and the resulting visual field reached 120 degrees. To evaluate the clarity and quality of the MM images, a signal-to-noise ratio valuation experiment was performed. In addition, we successfully applied this visual presentation system to studies of visual retinotopic mapping and object perception neural function in the peripheral visual field. Our study demonstrated that the system is compatible with the MM environment. Based on the wide-field mapping results, this system was more effective at mapping a checkerboard stimuli in V1-V3 from the central to peripheral visual fields. In higher-level visual areas, we successfully located several classical category-selective areas, including the face-selective area (FFA), occipital face area (OFA), house-selective area (PPA), transverse occipital sulcus (TOS), lateral occipital complex (LOC) and posterior fusiform area (pFs). In these areas, we found that the response amplitudes exhibited different decreasing trends with increasing eccentricity. In conclusion, we developed a simple, effective method for presenting wide-view visual stimuli within the MRI environment that can be applied to many kinds of fMRI studies of peripheral vision. (C) 2013 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jneumeth.2013.01.021

Direct measurement of force exerted during single microbubble generation

Shinji Deguchi, Satoshi Takahashi, Hidenori Hiraki, Syuhei Tanimura

APPLIED PHYSICS LETTERS 102 ( 8 ) 2013年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER INST PHYSICS

While there has been progress in the understanding of microbubble mechanics, the force associated with their formation has not previously been measured. Here we directly measure the force exerted during microbubble generation. We illuminate a carbon microfiber immersed in distilled water by using an infrared laser to produce individual bubbles. The fiber is elastically deformable and acts as a force sensor. A force of several nano-Newtons was detected on generation of each bubble. We show that water vaporization is responsible for the primary formation of the bubbles, and their subsequent expansion is caused by the diffusion of dissolved gases. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4793532]

DOI： 10.1063/1.4793532

Different Attentional Modulation in the Visual Word Form Area and Parahippocampal Place Area 査読

Geqi Qi, Bin Wang, Jinglong Wu, Satoshi Takahashi, Seiichiro Ohno, Susumu Kanazawa

Neuroscience and Biomedical Engineering 1 ( 2 ) 146 - 152 2013年

Cooperative Regulation of Vocal Fold Morphology and Stress by the Cricothyroid and Thyroarytenoid Muscles

Shinji Deguchi, Yuki Kawahara, Satoshi Takahashi

JOURNAL OF VOICE 25 ( 6 ) E255 - E263 2011年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：MOSBY-ELSEVIER

Voice is produced by vibrations of vocal folds that consist of multiple layers. The portion of the vocal fold tissue that vibrates varies depending primarily on laryngeal muscle activity. The effective depth of tissue vibration should significantly influence the vibrational behavior of the tissue and resulting voice quality. However, thus far, the effect of the activation of individual muscles on the effective depth is not well understood. In this study, a three-dimensional finite element analysis is performed to investigate the effect of the activation of two major laryngeal muscles, the cricothyroid (CT) and thyroarytenoid (TA) muscles, on vocal fold morphology and stress distribution in the tissue. Because structures that bear less stress can easily be deformed and involved in vibration, information on the morphology and stress distribution may provide a useful estimate of the effective depth. The results of the analyses indicate that the two muscles perform distinct roles, which allow cooperative control of the morphology and stress. When the CT muscle is activated, the tip region of the vocal folds becomes thinner and curves upward, resulting in the elevation of the stress magnitude all over the tissue to a certain degree that depends on the stiffness of each layer. On the other hand, the TA muscle acts to suppress the morphological change and controls the stress magnitude in a position-dependent manner. Thus, the present analyses demonstrate quantitative relationships between the two muscles in their cooperative regulation of vocal fold morphology and stress.

DOI： 10.1016/j.jvoice.2010.11.006

4自由度長さ提示装置の製作と指先の長さ知覚実験査読

呉景龍, 王海波, 北山直嗣, 高橋智

日本機械学会論文集C編 77 ( 778 ) 2336 - 2343 2011年

記述言語：日本語出版者・発行元：The Japan Society of Mechanical Engineers

In order to investigate the human characteristic on length perception between the thumb and four fingers, we developed a four-degree-of-freedom (4DOF) length display device which can adjust each four distances respectively. The 4DOF device was proofed by length perception experiment. The placement of 4 units of the 4DOF device arranges from fingertip trajectory experimental data. The position of 4 fingers basing on the thumb is changed by stepping motor. The experiment is that each length between the thumb and other four fingers is same length. The results suggested that the same trend of perceptual length by thumb and any other finger is underestimation. In addition, perceptual error around 70mm was the biggest.

DOI： 10.1299/kikaic.77.2336

触覚片仮名提示装置の開発と能動的触覚による片仮名認識特性の検討査読

呉景龍, 横谷逸, 楊家家, 高橋智

日本機械学会論文集Ｃ編 77 ( 775 ) 923 - 932 2011年

記述言語：日本語出版者・発行元：The Japan Society of Mechanical Engineers

Braille is one of the few writing systems that use tactile perception. The system is widely used by the blind to read and write. However, Braille is difficult to learn for persons with acquired blindness, especially for the elderly. Therefore, the aim of the present study was to design a tactile Japanese Katakana presentation device for the investigation of characteristics of tactile Katakana recognition. The device consists of a disk for tactile Katakana patterns, a force sensor unit for force measurement when subjects' fingers touch the tactile patterns, and an ultrasonic motor for tactile patterns presentation. Using the ultrasonic motor, the device presents characters to subjects quickly and automatically. Furthermore, the device has a big advantage that subjects are only required to move their fingers up and down, without any big submovements. An experiment was conducted using the device to test tactile recognition of 46 Katakana characters in native Japanese speakers with normal vision. Ten healthy right-handed male volunteers consented to participate in this experiment. Successful tactile Katakana recognition was higher than 78% (±14.4%) for these young subjects.

DOI： 10.1299/kikaic.77.923

緊急時における車制動行動のペダル配置と加齢効果の検討査読

呉景龍, 古谷慎平, 楊家家, 高橋智

日本機械学会論文集C編 77 ( 777 ) 2336 - 2343 2011年

記述言語：日本語出版者・発行元：The Japan Society of Mechanical Engineers

Driver safety is an important and often sensitive issue for seniors. Statistics show that the elderly are more likely than other drivers to receive traffic citations for failing to yield, turning improperly, and running red lights and stop signs all indications of decreased driving ability. Currently in Japan, half of the deceased in traffic accidents are elderly people. In present study, we focused on how the pedal placement affect on braking action in emergency. First, ten healthy young and ten elderly individuals were asked to perform a simple reaction experiment by foot. Then, the same subjects were instructed to complete a braking action experiment with different pedal placement condition. The results suggested that both simple reaction time and foot movement time of elderly subjects were significantly longer than that of young subjects. Moreover, the brake pedal force of elderly subjects was lower than that of young subjects. Thus, aging influenced both of simple reaction time and braking action in emergency. In addition, even the pedal placement changed characteristics of braking action of both young and elderly subjects, the most comfortable pedal placement of elderly subjects differed from young subjects.

DOI： 10.1299/kikaic.77.2062

Cavity generation by accelerated relative motions between solid walls contacting in liquid

S. Washio, S. Takahashi, K. Murakami, T. Tada, S. Deguchi

PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE 222 ( 9 ) 1695 - 1705 2008年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PROFESSIONAL ENGINEERING PUBLISHING LTD

A contact motion between two solids in a liquid can give rise to a cavity. To investigate this phenomenon, processes of cavity generation in a liquid between two walls making accelerated relative motions in their normal and tangential directions have been observed in detail, using microscopes and high-speed video cameras. The results are as follows: generation and subsequent expansion of a cavity are influenced by factors such as the initial clearance between the walls, the acceleration of motion, the initial pressure, the liquid viscosity, and the contact area. In contrast, air solubility in oil does not affect generation, but the size of a bubble remaining in the liquid. The pressure in a liquid film between two parallel walls normally moving away with a constant acceleration has also been theoretically analysed, providing the basis for the generation of tensile stresses in liquid films. Finally, the following idea of mechanism has been proposed: a tensile stress occurring in a liquid film breaks the liquid-solid interface, producing a rift, which develops into a visible cavity. Considering that liquid machines have many parts of contacting solids making relative motions, it is presumed that cavitation in them can start from this phenomenon.

DOI： 10.1243/09544062JMES965

針状突起を使った油のキャビテーション初生機構の研究査読

鷲尾誠一, 高橋智, 川原真一郎, 岸谷征典

日本機械学会論文集(B編) 66 ( 651 ) 2912 - 2919 2000年

キャビテーションを利用した油の脱気法に関する研究

高橋智, 鷲尾誠一, 関理文, 丁爾奇

日本油空圧学会論文集 30 ( 5 ) 141 - 146 1999年

油のキャビテーション初生の観察査読

鷲尾誠一, 高橋智, 宇田康弘, 砂原匠

日本機械学会論文集(B編) 65 ( 633 ) 1643 - 1651 1999年

鉱油に対する気体の飽和溶解度と拡散係数の測定査読

鷲尾誠一, 高橋智, 井元智可至, 吉田篤正

日本機械学会論文集(C編) 63 ( 609 ) 1701 - 1709 1996年

往復ピストン前面助走域における油の振動流れ(その数値計算とLDV測定)(共著)

鷲尾誠一, 高橋智, 伊藤勝英

日本機械学会論文集(B編) 62 ( 594 ) 564 - 571 1996年

記述言語：日本語出版者・発行元：一般社団法人日本機械学会

In front of a reciprocating piston in a pipe containing fluid, the velocity profile is assumed to vary continuously in the axial direction from a uniform one to that of an ordinary oscillatory viscous pipe flow. The present paper deals with theoretical and experimental discussions of this subject. Numerical calculations have indicated that the transition of velocity profiles is completed within a pipe radius away from the piston. In order to experimentally verify this finding, an LDV with a counter-type signal processor is used to measure velocities in oscillatory oil flows close to a reciprocating piston. Although a counter is usually not used for measuring unsteady flows, it has proved applicable to periodic flows when the data within the same range of phase angle are separately collected and stochastically processed in the same way as in an ordinary steady measurement. The measurements thus carried out have given satisfactory results which agree with the theoretical predictions.

DOI： 10.1299/kikaib.62.564

Audiovisual integration and sensory dominance effects in older adults with subjective cognitive decline: Enhanced redundant effects and stronger fusion illusion susceptibility

Shengnan Li, Weiping Yang, Yueying Li, Ruizhi Li, Zhilin Zhang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu, Mengni Zhou, Jiajia Yang

Brain and Behavior 2024年8月

The effects of crossmodal semantic reliability for audiovisual immersion experience of virtual reality 査読

Hongtao Yu, Qiong Wu, Mengni Zhou, Qi Li, Jiajia Yang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

International Journal of Mechatronics and Automation 9 ( 4 ) 161 - 171 2023年4月

Spatial frequencies affect cuteness perception of infant faces. 招待査読

Mengni Zhou, Huazhi Li, Qingqing Li, Tsubasa Uehara, Lichang Yao, Jiajia Yang, Yoshimichi Ejima, Satoshi Takahashi, Jinglong Wu

Emotion 23 ( 2 ) 512 - 520 2023年3月

Timing of tactile orientation adaptation in human primary somatosensory cortex: evidence from event-related potentials 査読

Rongxia Ren, Jiajia Yang, Yinghua Yu, Hiroto Kume, Yoshimichi Ejima, Jinglong Wu

The 2022 16th International Conference on complex Medical Engineering 2022年11月

Complexity measure for effective description of functional brain network dynamics 査読

Weichao An, Nan Zhang, Jiajia Yang, Yinghua Yu, Yoshimichi Ejima, Jinglong

The 2022 16th International Conference on complex Medical Engineering 2022年11月

Difference in Haptic Softness Estimation Using Pressing and Pinching 査読

Binyue Gao, Jiajia Yang, Yinghua Yu, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

The 2022 16th International Conference on complex Medical Engineering 2022年11月

Auditory attentional load alters the time window and peak of audiovisual integration in older and younger adults: a behavior study 査読

Shengnan Li, Weiping Yang, Jiajia Yang, Yinghua Yu, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

The 2022 16th International Conference on complex Medical Engineering 2022年11月

The alteration of audiovisual integration during aging: evidence from event-related potentials study 査読

Ao Guo, Weiping Yang, Jiajia Yang, Yinghua Yu, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

The 2022 16th International Conference on complex Medical Engineering 2022年11月

Whether attentional loads influence audiovisual integration depends on semantic associations 査読

Qingqing Li, Yiyang Yu, Yulong Liu, Zhihan Xu, Lu Fan, Satoshi Takahashi, Jiajia Yang, Yoshimichi Ejima, Qiong Wu, Jinglong Wu

Attention, Perception, & Psychophysics 84 ( 7 ) 2205 - 2218 2022年10月

Enhancing free choice masked priming via switch trials during repeated practice

Qi Dai, Lichang Yao, Qiong Wu, Yiyang Yu, Wen Li, Jiajia Yang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

Frontiers in Psychology 13 2022年9月

掲載種別：研究論文（学術雑誌）出版者・発行元：Frontiers Media SA

The masked priming paradigm has been extensively used to investigate the indirect impacts of unconscious stimuli on conscious behaviors, and the congruency effect of priming on free choices has gained increasing attention. Free choices allow participants to voluntarily choose a response from multiple options during each trial. While repeated practice is known to increase priming effects in subliminal visual tasks, whether practice increases the priming effect of free choices in the masked priming paradigm is unclear. And it is also not clear how the proportions of free choice and forced choice trials in one block will affect the free choice masked priming effect. The present study applied repeated practice in the masked priming paradigm and found that after training, the participants were more likely to be influenced by masked primes during free choice, but this training process did not alter the visibility of masked stimuli. In addition, this study revealed that when the proportions of free choice and forced choice trials were equal during the training stage, this enhanced effect by practice was the strongest. These results indicated that practice could enhance masked stimulus processing in free-choice, and that the learning effect may mainly be derived from the early selection and integrated processing of masked stimuli.

DOI： 10.3389/fpsyg.2022.927234

A Basic Psychophysics Study of Sound Reliability Effects on Audiovisual Integration for Developing New Virtual Reality Device 査読

Hongtao Yu, Qiong Wu, Mengni Zhou, Qi Li, Jiajia Yang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

The 2021 IEEE International Conference on Mechatronics and Automation (ICMA2021) 2022年8月

Investigating the difference of face distinction between adult and infant for the design of service robots 査読

Lichang Yao, Qi Dai, Yiyang Yu, Yuki Nishioka, Qiong Wu, Jiajia Yang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

International Journal of Mechatronics and Automation 9 ( 3 ) 134 - 141 2022年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Inderscience Publishers

People's requirements for service robots are gradually increasing as their application scope expands and science and technology advance. When facing multiple objects, orderly service can no longer meet the needs of customers. Searching for clients in greater need and providing humanised services in a timely manner is a new task. This study uses human behaviour as a learning blueprint to investigate whether adults can respond quickly to infants. The results show that humans can respond quickly to infants. This could lead to the development of humanised service robots that prioritise infants as service objects and provide gentle service by recognising infant facial features.

DOI： 10.1504/ijma.2022.123892

Semantically congruent audiovisual integration with modal-based attention accelerates auditory short-term memory retrieval 招待査読

Hongtao Yu, Aijun Wang, Ming Zhang, JiaJia Yang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

Attention, Perception, & Psychophysics 84 ( 5 ) 1625 - 1634 2022年5月

Tactile angle discriminability improvement: contributions of working memory training and continuous attended sensory input 査読

Wu Wang, Jiajia Yang, Yinghua Yu, Huazhi Li, Yulong Liu, Yiyang Yu, Jiabin Yu, Xiaoyu Tang, Jingjing Yang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

Journal of Neurophysiology 127 ( 5 ) 1398 - 1406 2022年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Physiological Society

Perceptual learning is not always specific to the trained task and stimuli. We demonstrate that both continuous attended sensory input and improved WM capacity can be used to enhance tactile angle discrimination (TAD) ability. Moreover, WM capacity improvement is important in generalizing the training effect to the TAD ability. These findings contribute to understanding the mechanism of perceptual learning generalization across tasks.

DOI： 10.1152/jn.00529.2021

Global surface features contribute to human haptic roughness estimations 査読

Huazhi Li, Jiajia Yang, Yinghua Yu, Wu Wang, Yulong Liu, Mengni Zhou, Qingqing Li, Jingjing Yang, Shiping Shao, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

Experimental Brain Research 240 ( 3 ) 773 - 789 2022年3月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Springer Science and Business Media LLC

Abstract

Previous studies have paid special attention to the relationship between local features (e.g., raised dots) and human roughness perception. However, the relationship between global features (e.g., curved surface) and haptic roughness perception is still unclear. In the present study, a series of roughness estimation experiments was performed to investigate how global features affect human roughness perception. In each experiment, participants were asked to estimate the roughness of a series of haptic stimuli that combined local features (raised dots) and global features (sinusoidal-like curves). Experiments were designed to reveal whether global features changed their haptic roughness estimation. Furthermore, the present study tested whether the exploration method (direct, indirect, and static) changed haptic roughness estimations and examined the contribution of global features to roughness estimations. The results showed that sinusoidal-like curved surfaces with small periods were perceived to be rougher than those with large periods, while the direction of finger movement and indirect exploration did not change this phenomenon. Furthermore, the influence of global features on roughness was modulated by local features, regardless of whether raised-dot surfaces or smooth surfaces were used. Taken together, these findings suggested that an object’s global features contribute to haptic roughness perceptions, while local features change the weight of the contribution that global features make to haptic roughness perceptions.

DOI： 10.1007/s00221-021-06289-0

その他リンク： https://link.springer.com/article/10.1007/s00221-021-06289-0/fulltext.html

Electrophysiological response to visual symmetry: Effects of the number of symmetry axes 査読

Meng Wang, Fengxia Wu, Gert van Tonder, Qiong Wu, Yang Feng, Yiyang Yu, Jiajia Yang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

Neuroscience Letters 770 136393 - 136393 2022年1月

Eye Size Affects Cuteness in Different Facial Expressions and Ages 査読

Lichang Yao, Qi Dai, Qiong Wu, Yang Liu, Yiyang Yu, Ting Guo, Mengni Zhou, Jiajia Yang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

Frontiers in Psychology 12 2022年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Frontiers Media SA

Researchers have suggested that infants exhibiting baby schema are considered cute. These similar studies have mainly focused on changes in overall baby schema facial features. However, whether a change in only eye size affects the perception of cuteness across different facial expressions and ages has not been explicitly evaluated until now. In the present study, a paired comparison method and 7-point scale were used to investigate the effects of eye size on perceived cuteness across facial expressions (positive, neutral, and negative) and ages (adults and infants). The results show that stimuli with large eyes were perceived to be cuter than both unmanipulated eyes and small eyes across all facial expressions and age groups. This suggests not only that the effect of baby schema on cuteness is based on changes in a set of features but also that eye size as an individual feature can affect the perception of cuteness.

DOI： 10.3389/fpsyg.2021.674456

Semantically Congruent Bimodal Presentation with Divided-Modality Attention Accelerates Unisensory Working Memory Retrieval 査読

Hongtao Yu, Aijun Wang, Qingqing Li, Yulong Liu, Jiajia Yang, Satoshi Takahashi, Yoshimichi Ejima, Ming Zhang, Jinglong Wu

Perception 50 ( 11 ) 917 - 932 2021年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SAGE Publications

Although previous studies have shown that semantic multisensory integration can be differentially modulated by attention focus, it remains unclear whether attentionally mediated multisensory perceptual facilitation could impact further cognitive performance. Using a delayed matching-to-sample paradigm, the present study investigated the effect of semantically congruent bimodal presentation on subsequent unisensory working memory (WM) performance by manipulating attention focus. The results showed that unisensory WM retrieval was faster in the semantically congruent condition than in the incongruent multisensory encoding condition. However, such a result was only found in the divided-modality attention condition. This result indicates that a robust multisensory representation was constructed during semantically congruent multisensory encoding with divided-modality attention; this representation then accelerated unisensory WM performance, especially auditory WM retrieval. Additionally, an overall faster unisensory WM retrieval was observed under the modality-specific selective attention condition compared with the divided-modality condition, indicating that the division of attention to address two modalities demanded more central executive resources to encode and integrate crossmodal information and to maintain a constructed multisensory representation, leaving few resources for WM retrieval. Additionally, the present finding may support the amodal view that WM has an amodal central storage component that is used to maintain modal-based attention-optimized multisensory representations.

DOI： 10.1177/03010066211052943

その他リンク： http://journals.sagepub.com/doi/full-xml/10.1177/03010066211052943

A Basic Psychophysics Study of Visual Masking Effect on Kanji Recognition for Image Recognition Technology 査読

Qi Dai, Lichang Yao, Ikue Hattori, Qiong Wu, Jiajia Yang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

The 2021 IEEE International Conference on Mechatronics and Automation (ICMA2021) 1292 - 1297 2021年8月

A Behavior Study on the Effect of Baby Schema on Face Discrimination for Robot Appearance Design 査読

Lichang Yao, Qi Dai, Yiyang Yu, Yuki Nishioka, Qiong Wu, Mengni Zhou, Jiajia Yang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

The 2021 IEEE International Conference on Mechatronics and Automation (ICMA2021) 1286 - 1291 2021年8月

A New Method for Haptic Shape Discriminability Detection 査読国際共著国際誌

Yulong Liu, Jiajia Yang, Yinghua Yu, Yiyang Yu, Wu Wang, Huazhi Li, Satoshi TAKAHASHI, Yoshimichi Ejima, Qiong Wu, Jinglong Wu

Applied Sciences 11 ( 15 ) 7049 - 7049 2021年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：{MDPI} {AG}

Touch shape discrimination is not only closely related to tactile mechanoreceptors but also higher cognitive function. However, previous shape discrimination methods are difficult to complete in a short time, and the devices are complicated to operate and not user-friendly for nonprofessionals. Here, we propose a new method, the evaluation quantity of which is the angle discrimination threshold. In addition, to make this method easy to use for nonprofessionals, we designed a haptic angle sorting system, including the device and software. To evaluate this method, the angle sorting and two-angle discrimination experiments were compared, and it was found that participants spent significantly less time in the former experiment than in the latter. At the same time, there is a strong correlation between the performance of angle sorting and two-angle discrimination, which shows that the angle threshold obtained by the new method can also be used to evaluate the ability of touch discrimination. Moreover, the angle sorting results of different age groups also further demonstrate the feasibility of the method. The efficiency of this new method and the effectiveness of the system also provide a convenient means for evaluating haptic shape discrimination, which may have potential clinical application value in the early diagnosis of peripheral neuropathy and even in the evaluation of cognitive function.

DOI： 10.3390/app11157049

Improving Visual Working Memory With Training on a Tactile Orientation Sequence Task in Humans 査読

Ting Guo, Yanna Ren, Yinghua Yu, Yiyang Yu, Yuuki Hasegawa, Qiong Wu, Jiajia Yang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

SAGE Open 11 ( 3 ) 215824402110315 - 215824402110315 2021年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SAGE Publications

Working memory refers to the cognitive capacity to temporarily store and manipulate information from multiple sensory domains. Recent studies have shown that cognitive training can improve performance in both visual working memory and tactile working memory tasks. However, it is still unclear whether the effects of training can be transferred from one sensory modality to another. The current study assessed whether the training effect of the tactile orientation sequence task could transfer to visual orientation sequence and visuospatial working memory tasks. The results showed that participants’ accuracy in the tactile orientation sequence task was significantly increased after 9 days of training compared with that before training. Remarkably, participants’ accuracy in both the visual orientation sequence task and the visuospatial task was significantly improved after 9 days of training. These results suggest that it is possible to improve visual working memory through a transfer effect from tactile task training without practice in the visual domain, which opens a wide range of applications for tactile orientation sequence tasks.

DOI： 10.1177/21582440211031549

その他リンク： http://journals.sagepub.com/doi/full-xml/10.1177/21582440211031549

The effect of flanker category on crowding is modulated by processing time 査読

Jinglong Wu, Yoshimichi Ejima, Satoshi Takahashi, Jiajia Yang, Qi Dai, Qiong Wu, Yiyang Yu

International Journal of Mechatronics and Automation 8 ( 2 ) 100 - 109 2021年3月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Inderscience Publishers

When the human visual system processes complex scenes, crowding is considered a bottleneck in interpreting visual information. Several studies have reported that visual crowding seems to occur in the early stage of visual possessing. After that, extensive evidence suggested that high-level visual information has a major effect on crowding, which showed substantial interest in the impact of high-level visual information on crowding. However, the temporal property of high-level crowding is not well understood. Here, we performed a series of behavioural experiments to show how flanker category information and exposure time affected crowding's intensity. We found that as the category's effect becomes stronger, the intensity of crowding will be reduced in longer exposure time. The peak of this effect occurs at the time window of 100 ms-150 ms after the stimulus appears. We propose that exposure time may modulate high-level information processing depth, which can adjust multi-level crowding.

DOI： 10.1504/ijma.2021.10036631

The categorical relational process mechanism in enactment learning: effects of divided attention and categorical cues 査読国際共著

Lijuan Wang, Qingqing Li, Qiong Wu, Satoshi Takahashi, Jinglong Wu

Journal of Cognitive Psychology 33 ( 2 ) 133 - 145 2021年2月

Temporal expectation driven by rhythmic cues compared to that driven by symbolic cues provides a more precise attentional focus in time 査読国際共著

Zhihan Xu, Yanna Ren, Ting Guo, Aijun Wang, Takanori Nakao, Yoshimichi Ejima, Jiajia Yang, Satoshi Takahashi, Jinglong Wu, Qiong Wu, Ming Zhang

Attention, Perception, & Psychophysics 83 ( 1 ) 308 - 314 2021年1月

Semantic Congruency Modulates the Effect of Attentional Load on the Audiovisual Integration of Animate Images and Sounds 査読国際共著

Qingqing Li, Qiong Wu, Yiyang Yu, Fengxia Wu, Satoshi Takahashi, Yoshimichi Ejima, Jiajia Yang, Jinglong Wu

i-Perception 11 ( 6 ) 204166952098109 - 204166952098109 2020年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SAGE Publications

Attentional processes play a complex and multifaceted role in the integration of input from different sensory modalities. However, whether increased attentional load disrupts the audiovisual (AV) integration of common objects that involve semantic content remains unclear. Furthermore, knowledge regarding how semantic congruency interacts with attentional load to influence the AV integration of common objects is limited. We investigated these questions by examining AV integration under various attentional-load conditions. AV integration was assessed by adopting an animal identification task using unisensory (animal images and sounds) and AV stimuli (semantically congruent AV objects and semantically incongruent AV objects), while attentional load was manipulated by using a rapid serial visual presentation task. Our results indicate that attentional load did not attenuate the integration of semantically congruent AV objects. However, semantically incongruent animal sounds and images were not integrated (as there was no multisensory facilitation), and the interference effect produced by the semantically incongruent AV objects was reduced by increased attentional-load manipulations. These findings highlight the critical role of semantic congruency in modulating the effect of attentional load on the AV integration of common objects.

DOI： 10.1177/2041669520981096

その他リンク： http://journals.sagepub.com/doi/full-xml/10.1177/2041669520981096

Frequency ratio determines discrimination of concentric radial frequency patterns in the peripheral visual field 査読国際共著

Yang Feng, Qiong Wu, Jiajia Yang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu, Ming Zhang

Attention, Perception, & Psychophysics 82 ( 8 ) 3993 - 4006 2020年11月

Visual Orientation Sequence Task enhances Working Memory in Younger and Older Adults 査読

Ting Guo, Yanna Ren, Yinghua Yu, Yiyang Yu, Seongyeol Yun, Qiong Wu, Jiajia Yang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

The 2020 IEEE International Conference on Mechatronics and Automation (ICMA2020) 2020年10月

Temporal Factors for the Flanker Category Effect under Visual Crowding 査読

Yiyang Yu, Qiong Wu, Jiajia Yang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

The 2020 IEEE International Conference on Mechatronics and Automation (ICMA2020) 2020年10月

Research and Development of the Synchronization Device of fMRI Scanning Cycle and External Stimulus Presentation Equipment 査読

Yulong Liu, Jiajia Yang, Qiong Wu, Hongtao Yu, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

2020 IEEE International Conference on Mechatronics and Automation (ICMA) 2020年10月

Improving the accuracy and speed of choice in human-computer interactions via a subliminal priming effect 査読

Qi Dai, Lichang Yao, Yiyang Yu, Qiong Wu, Jiajia Yang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

International Journal of Mechatronics and Automation 7 ( 2 ) 105 - 112 2020年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Inderscience Publishers

With the development of information processes, the interaction between humans and computers is everywhere in our daily life. As the level of human-computer interaction continues to rise, the cognitive load in human-computer interaction is also increasing, and thus, the operational error rate is rising. Subliminal communication technology refers to the use of appropriate methods to provide subliminal cues to convey supplementary information in an unconscious way. This method does not increase the burden on cognitive channels, but it improves people's abilities to recognise and make decisions. Therefore, we conducted a series of experiments on the subliminal priming effect to observe the feasibility of this idea. We used experimental psychophysical methods to demonstrate that the subliminal stimuli had a considerable impact on various cognitive processes and decision-making.

DOI： 10.1504/ijma.2020.10030733

Eccentricity Effect of Deformation Detection for Radial Frequency Patterns With Their Centers at Fixation Point 査読国際共著

Yang Feng, Qiong Wu, Jiajia Yang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu, Ming Zhang

Perception 49 ( 8 ) 858 - 881 2020年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SAGE Publications

We measured the eccentricity effect of deformation thresholds of circular contours for two types of the radial frequency (RF) patterns with their centers at the fixation point: constant circular contour frequency (CCF) RF patterns and constant RF magnified (retino-cortical scaling) RF patterns. We varied the eccentricity by changing the mean radius of the RF patterns while keeping the centers of the RF patterns at the fixation point. Our peripheral stimulus presentation was distinguished from previous studies which have simply translated RF patterns at different locations in the visual field. Sensitivity for such shape discrimination fell off as the moderate and high CCF patterns were presented on more eccentric sites but did not as the low CCF patterns. However, sensitivity held constant as the magnified RF patterns were presented on more eccentric sites, indicating that the eccentricity effects observed for the high and moderate CCF patterns were neutralized by retinocortical mapping. Notably, sensitivity for the magnified RF patterns with large radii (4°–16°) presented in the peripheral field revealed a similar RF dependence observed for RF patterns with small radii (0.25°–1.0°) presented at the fovea in previous studies.

DOI： 10.1177/0301006620936473

その他リンク： http://journals.sagepub.com/doi/full-xml/10.1177/0301006620936473

Tactile Semiautomatic Passive-Finger Angle Stimulator (TSPAS) 査読国際共著

Wu Wang, Jiajia Yang, Yinghua Yu, Qiong Wu, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

Journal of Visualized Experiments ( 161 ) 2020年7月

触覚による物体のサイズ知覚に関する研究（長さ・大きさの弁別及び評定特性の解析）査読国際共著

高橋智, 岡本京介, 武之煒, 高彬月, 大谷芳夫, 江島義道, 呉景龍

日本機械学会論文集 86 ( 884 ) 19 - 00437 2020年

Tactile angle discriminability improvement: roles of training time intervals and different types of training tasks. 査読国際誌

Wu Wang, Jiajia Yang, Yinghua Yu, Qiong Wu, Jiabin Yu, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

Journal of neurophysiology 122 ( 5 ) 1918 - 1927 2019年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

Perceptual learning, which is not limited to sensory modalities such as vision and touch, emerges within a training session and between training sessions and is accompanied by the remodeling of neural connections in the cortex. However, limited knowledge exists regarding perceptual learning between training sessions. Although tactile studies have paid attention to between-session learning effects, there have been few studies asking fundamental questions regarding whether the time interval between training sessions affects tactile perceptual learning and generalization across tactile tasks. We investigated the effects of different training time intervals on the consecutive performance of a tactile angle discrimination (AD) task and a tactile orientation discrimination (OD) task training on tactile angle discriminability. The results indicated that in the short-interval training group, AD task performance significantly improved in the early stage of learning and nearly plateaued in the later stage, whereas in the long-interval training group, significant improvement was delayed and then also nearly plateaued in the later stage; additionally, improved OD task performance resulted in improved AD task performance. These findings suggest that training time interval affects the early stage of learning but not the later stage and that generalization occurs between different types of tactile tasks.NEW & NOTEWORTHY Perceptual learning, which constitutes important foundations of complicated cognitive processes, is learning better perception skills. We demonstrate that training time interval can affect the early stage of learning but not the later stage. Moreover, a tactile orientation discrimination training task can also improve tactile angle discrimination performance. These findings may expand the characteristics of between-session learning and help understand the mechanism of the generalization across tactile tasks.

DOI： 10.1152/jn.00161.2019

Tactile Training Improvement of Same-orientation but Not Different-orientation Discrimination 査読

Wu Wang, Jiajia Yang, Yinghua Yu, Qiong Wu, Qingqing Li, Jiabin Yu, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

Proceedings of International Conference on Mechatronics and Automation, ICMA2019 2019年8月

The impacts of subliminal priming effect on normal choice and questionnaire choice 査読

Qi Dai, Lichang Yao, Yiyang Yu, Qiong Wu, Jiajia Yang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

Proceedings of International Conference on Mechatronics and Automation, ICMA2019 1530 - 1535 2019年8月

A Basic Study on Capacity and Reaction Time of Visual Working Memory for Elderly Memory Training 査読

Ting Guo, Yinghua Yu, Yanna Ren, Yiyang Yu, Qiong Wu, Jiajia Yang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

Proceedings of International Conference on Mechatronics and Automation, ICMA2019, 600 - 604 2019年8月

A basic study on relationship between facial expression and cuteness for human-robot emotional communication 査読

Lichang Yao, Qi Dai, Ting Guo, Jiajia Yang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu, Qiong Wu

Proceedings of International Conference on Mechatronics and Automation, ICMA2019 892 - 897 2019年8月

A Reading Assistant System of Chinese Text for Persons with Central Visual Field Loss 査読

Yiyang Yu, Qiong Wu, Yang Feng, Meng Wang, Yulong Liu, Jiajia Yang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

Proceedings of International Conference on Mechatronics and Automation, ICMA2019 2019年8月

The Identification and Evaluation for Animal and Other Sounds: The Effect of Presentation Time 査読

Qingqing Li, Qiong Wu, Jiajia Yang, Yiyang Yu, Fengxia Wu, Wu Wang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

Proceedings of International Conference on Mechatronics and Automation, ICMA2019 2019年8月

Contrast Discrimination of Circular Contour Patterns Across Visual Field for Virtual Reality

Yang Feng, Qiong Wu, Jiajia Yang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

Proceedings of 2019 IEEE International Conference on Mechatronics and Automation, ICMA 2019 1108 - 1113 2019年8月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Institute of Electrical and Electronics Engineers Inc.

Understanding of human sensory system will provide useful information's to the development of virtual reality (VR) technology that simulates a 3D virtual world and enables the generation of visual, audio, and haptic feedback for the full immersion of users. The present study is aimed to promote a better understanding of the visual system which is indispensable to recognize objects, face, animal, building, and natural scene in the visual environment in daily lives. We are focused to study difference in perception between foveal and peripheral visual system. We asked here about dependency of contrast discrimination of circular contour patterns on retinal eccentricity of the visual field, using standard (non-magnified) and cortically magnified stimuli. The contrast discrimination thresholds for the standard stimuli increased with increasing the retinal eccentricity. However, those for the cortically magnified stimuli remained constant irrespective of change of retinal eccentricity. We concluded that contrast discrimination thresholds, once scaling by cortically magnification transformation, were similar at all eccentricities.

DOI： 10.1109/ICMA.2019.8816238

Stroking hardness changes the perception of affective touch pleasantness across different skin sites 査読国際誌

Jiabin Yu, Jiajia Yang, Yinghua Yu, Qiong Wu, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

Heliyon 5 ( 8 ) e02141 - e02141 2019年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Elsevier BV

Human unmyelinated tactile afferents (CT afferents) in hairy skin are thought to be involved in the transmission of affective aspects of touch. How the perception of affective touch differs across human skin has made substantial progress; however, the majority of previous studies have mainly focused on the relationship between stroking velocities and pleasantness ratings. Here, we investigate how stroking hardness affects the perception of affective touch. Affective tactile stimulation was given with four different hardness of brushes at three different forces, which were presented to either palm or forearm. To quantify the physical factors of the stimuli (brush hardness), ten naïve, healthy participants assessed brush hardness using a seven-point scale. Based on these ten participants, five more participants were added to rate the hedonic value of brush stroking using a visual analogue scale (VAS). We found that pleasantness ratings over the skin resulted in a preference for light, soft stroking, which was rated as more pleasant when compared to heavy, hard stroking. Our results show that the hairy skin of the forearm is more susceptible to stroking hardness than the glabrous of the palm in terms of the perception of pleasantness. These findings of the current study extend the growing literature related to the effect of stroking characteristics on pleasantness ratings.

DOI： 10.1016/j.heliyon.2019.e02141

Does Temporal Expectation Driven by Rhythmic Cues Differ From That Driven by Symbolic Cues Across the Millisecond and Second Range? 査読国際共著国際誌

Yanna Ren, Zhihan Xu, Fengxia Wu, Yoshimichi Ejima, Jiajia Yang, Satoshi Takahashi, Qiong Wu, Jinglong Wu

Perception 48 ( 6 ) 515 - 529 2019年6月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SAGE Publications

Temporal expectation relies on different predictive information, such as regular rhythms and symbolic cues, to direct attention to a future moment in time to optimize behaviour. However, whether differences exist between temporal expectations driven by regular rhythms and symbolic cues has not been clearly established. In this study, 20 participants performed two temporal expectation tasks in which a rhythmic cue or a symbolic cue indicated (70% expected) that the target would appear after an interval of 500 ms (short), 1,500 ms (medium), or 2,500 ms (long). We found larger cueing effects for the rhythmic cued task than for the symbolic cued task during the short interval, indicating that rhythmic cues were more effective in improving performance. Furthermore, no significant difference was found during the longer interval, reflect that the behavioural differences between the two forms of temporal expectations were likely to diminish as the time interval increased. Thus, we speculate that the temporal expectation driven by rhythmic cues differs from that driven by symbolic cues only in the limited time range; however, the mechanisms underlying the two forms of temporal expectations trend to become more similar over increasing temporal scales.

DOI： 10.1177/0301006619847579

その他リンク： http://journals.sagepub.com/doi/full-xml/10.1177/0301006619847579

Visual Identification Attenuates Audiovisual Interaction 査読

Wu F, Ren Y, Tang X, Wu Q, Ejima Y, Yang J, Takahashi S, Wu J

Information 21 ( 7 ) 2059 - 2069 2018年5月

Comparison for younger and older adults: Stimulus temporal asynchrony modulates audiovisual integration 査読国際共著

Yanna Ren, Yanling Ren, Weiping Yang, Xiaoyu Tang, Fengxia Wu, Qiong Wu, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

International Journal of Psychophysiology 124 1 - 11 2018年2月

Absent Audiovisual Integration Elicited by Peripheral Stimuli in Parkinson’s Disease 査読国際誌

Yanna Ren, Keisuke Suzuki, Weiping Yang, Yanling Ren, Fengxia Wu, Jiajia Yang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu, Koichi Hirata

Parkinson's Disease 2018 1 - 10 2018年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Hindawi Limited

The basal ganglia, which have been shown to be a significant multisensory hub, are disordered in Parkinson’s disease (PD). This study was to investigate the audiovisual integration of peripheral stimuli in PD patients with/without sleep disturbances. Thirty-six age-matched normal controls (NC) and 30 PD patients were recruited for an auditory/visual discrimination experiment. The mean response times for each participant were analyzed using repeated measures ANOVA and race model. The results showed that the response to all stimuli was significantly delayed for PD compared to NC (all<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:mi>p</mml:mi><mml:mo><</mml:mo><mml:mn>0.01</mml:mn></mml:mrow></mml:math>). The response to audiovisual stimuli was significantly faster than that to unimodal stimuli in both NC and PD (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M2"><mml:mrow><mml:mi>p</mml:mi><mml:mo><</mml:mo><mml:mn>0.001</mml:mn></mml:mrow></mml:math>). Additionally, audiovisual integration was absent in PD; however, it did occur in NC. Further analysis showed that there was no significant audiovisual integration in PD with/without cognitive impairment or in PD with/without sleep disturbances. Furthermore, audiovisual facilitation was not associated with Hoehn and Yahr stage, disease duration, or the presence of sleep disturbances (all<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M3"><mml:mrow><mml:mi>p</mml:mi><mml:mo>></mml:mo><mml:mn>0.05</mml:mn></mml:mrow></mml:math>). The current results showed that audiovisual multisensory integration for peripheral stimuli is absent in PD regardless of sleep disturbances and further suggested the abnormal audiovisual integration might be a potential early manifestation of PD.

DOI： 10.1155/2018/1648017

その他リンク： http://downloads.hindawi.com/journals/pd/2018/1648017.xml

Audiovisual Integration Delayed by Stimulus Onset Asynchrony Between Auditory and Visual Stimuli in Older Adults 査読

Yanna Ren, Weiping Yang, Kohei Nakahashi, Satoshi Takahashi, Jinglong Wu

Perception 46 ( 2 ) 205 - 218 2017年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SAGE Publications

Although neuronal studies have shown that audiovisual integration is regulated by temporal factors, there is still little knowledge about the impact of temporal factors on audiovisual integration in older adults. To clarify how stimulus onset asynchrony (SOA) between auditory and visual stimuli modulates age-related audiovisual integration, 20 younger adults (21–24 years) and 20 older adults (61–80 years) were instructed to perform an auditory or visual stimuli discrimination experiment. The results showed that in younger adults, audiovisual integration was altered from an enhancement (AV, A ± 50 V) to a depression (A ± 150 V). In older adults, the alterative pattern was similar to that for younger adults with the expansion of SOA; however, older adults showed significantly delayed onset for the time-window-of-integration and peak latency in all conditions, which further demonstrated that audiovisual integration was delayed more severely with the expansion of SOA, especially in the peak latency for V-preceded-A conditions in older adults. Our study suggested that audiovisual facilitative integration occurs only within a certain SOA range (e.g., −50 to 50 ms) in both younger and older adults. Moreover, our results confirm that the response for older adults was slowed and provided empirical evidence that integration ability is much more sensitive to the temporal alignment of audiovisual stimuli in older adults.

DOI： 10.1177/0301006616673850

その他リンク： http://journals.sagepub.com/doi/full-xml/10.1177/0301006616673850

The Effects of Aging on Haptic Working Memory During Length Discrimination 査読

Zhiwei Wu, Yinghua Yu, Jiajia Yang, Satoshi Takahashi, Yoshimichi Ejima, Jinglong Wu

Neuroscience and Biomedical Engineering 5 ( 1 ) 74 - 80 2017年

Development and Evaluation of a Tactile Cognitive Function Test Device for Alzheimer's Disease Early Detection 査読

Jiajia Yang, Mohd, Usairy Syafiq, Yinghua Yu, Satoshi Takahashi, Zhenxin Zhang, Jinglong Wu

Neuroscience and Biomedical Engineering 3 ( 2 ) 58 - 65 2015年

Speed matching in-teraction between visual and tactile mo-tion 査読

Liancun Zhang, Jiajia Yang, Yinghua Yu, Satoshi Takahashi, Yuta Araki, Qiang Huang, Jinglong Wu

Neuroscience and Biomedical Engineering 3 ( 1 ) 20 - 26 2015年

Development of a Wide-View Visual Presentation System for Functional MRI Studies of Peripheral Visual 査読

Bin Wang, Jinglong Wu, JiaJia Yang, Yuu Hikino, Satoshi Takahashi, Tianyi Yan, Seiichiro Ohno, Susumu Kanazawa

BRAIN AND HEALTH INFORMATICS 8211 277 - 286 2013年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：SPRINGER-VERLAG BERLIN

In present paper, we described a novel wide-view visual presentation system for fMRI studies. To achieve a wide field view, a translucent spherical screen with a curvature radius of 30 mm was placed 30 mm away from the subjects' eyes. The subjects wore contact lenses that enabled them to focus on the screen, and the resulting visual field reached 120 degrees. Then, high resolution computer-generated images were projected onto the translucent hemispheric screen inside the MRI bore. Signal-to-noise ratio valuation experiment was performed to evaluate the clarity and quality of the MRI images. In addition, we successfully applied this visual presentation system to studies of visual retinotopic mapping and object perception neural function in the peripheral visual field. Our study demonstrated that the system is compatible with the MRI environment. Moreover, this system was more effective at mapping checkerboard stimuli in V1-V3, and successfully located several classical category-selective areas, including the face-selective area (FFA), occipital face area (OFA), house-selective area (PPA), transverse occipital sulcus (TOS), lateral occipital complex (LOC) in higher-level visual areas. In conclusion, the wide-view visual presentation system within the MRI environment can be applied to many kinds of fMRI studies of peripheral vision.

Flow Electrification of Insulated Liquid in Metal Pipes 査読

Zhu Shouxin, Liu Lin, Takahashi Satoshi

Chinese Journal of Mechanical Engineering 25 ( 6 ) 1115 - 1120 2012年

Producing single microbubbles with controlled size using microfiber 査読

Deguchi, S, Takahashi, S, Tanimura, S, Hiraki, H

Advances in Bioscience and Biotechnology 2011年

Experimental Study on Measurement Method of Flow Electrification 査読

Shou Xin Zhu, Wen Jun Hu, Hui Meng Zheng, Satoshi Takahashi

Applied Mechanics and Materials 43 303 - 307 2010年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Trans Tech Publications, Ltd.

When a relative motion occurring between liquid and solid, electric charges with opposite signs come out separately on each side by friction which phenomena is called flow electrification. As the amount of charge generated by flow electrification is small, and part of which neutralize each other at the same time, the test method of flow electrification becomes one of discussion topics for scientists of all countries. This paper introduces an experimental measurement method of flow electrification, which is a comparative method by inserting electrodes in pipelines, and acquisition amplifier circuit, with high resolution and strong anti-jamming ability. Experiments show that the measurement method could be applied to system testing for flow electrification.

DOI： 10.4028/www.scientific.net/amm.43.303

Nucleation and subsequent cavitation in a hydraulic oil poppet valve 査読

S Washio, S Kikui, S Takahashi

Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 224 ( 4 ) 947 - 958 2010年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SAGE Publications

If bubble nuclei are the cause of cavitation, how are they initially produced? According to what Washio et al. have found out so far, there are two possible ways for cavitation nuclei to be generated in liquid flows: separation of flow and a relative motion between solids contacting in liquid. The present article intends to reinforce that assertion by observing the cavitation occurring in an oil hydraulic poppet valve.

At a certain flowrate, a microscopic cavity suddenly emerged on the valve seat where the flow separated. As the flowrate increased, the cavity developed extending circumferentially on the seat and discharged bubbles by splitting. A collision of the poppet with the valve seat also caused the generation of a cavity. As the poppet was away from the seat after the collision, the cavity shrunk leaving behind a bubble.

Cavities generated on the seat by flow separation regularly repeated a process of growth and shrinkage accompanied by bubble discharge, which induced flow pulsation and consequently vibration of the poppet supported by a spring as well. Moreover, these cavities brought about so-called ‘choking’ in the poppet—seat constriction and acted to increase the pressure loss there by narrowing its cross-section.

DOI： 10.1243/09544062jmes1618

Observation of cavitation inception in separating water flows through constricted channels

S. Washio, S. Fujiyoshi, S. Takahashi

PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE 223 ( 9 ) 2071 - 2080 2009年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SAGE PUBLICATIONS LTD

The research group including two of the present authors previously discovered a surprising phenomenon in oil flows through constricted channels; at a certain flowrate when there is no cavitation occurring, an infinitesimal cavity suddenly emerges on the wall where the flow separates. The newborn cavity grows and splits releasing many minute bubbles to downstream, as the flowrate increases. To see if this phenomenon occurs in water too, water flows through rectangular and cylindrical constrictions have been meticulously observed with very high resolution in terms of both time and space. As a result it has been confirmed that the same phenomenon does occur in separating water flows as well, although the developing process of a newborn cavity in water flows is different from that in oil flows probably depending on a large difference in Reynolds numbers between both flows. When the flowrate is substantially increased from that for the cavity inception, a large attached cavity is formed on the wall just downstream of the separation point, as it occurred in corresponding oil flows. The pressure inside the cavity has proved to be almost equal to the saturation vapour pressure of water.

DOI： 10.1243/09544062JMES1438

Human Characteristics on Length Perception with Three Fingers for Tactile Intelligent Interfaces 査読

Haibo Wang, Jinglong Wu, Satoshi Takahashi

ACTIVE MEDIA TECHNOLOGY, PROCEEDINGS 5820 217 - 225 2009年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：SPRINGER-VERLAG BERLIN

When an object is touched, the properties like shape, temperature, rigidity, texture and weight should be perceived. As a basic research of human tactile, it is most important to know how humans could perceive the shape of the object with fingers. Thus length and contacting curvature of an object are thought to provide important perception information. Most of the length perception studies are about two fingers using the thumb and the index finger. There are scarce perception studies using multi-fingers grasping. In present study, to investigate the human tactile length perception mechanism with multi-fingers, we develop a tactile length interface device for one and two lengths with three fingers and conduct two experiments of one and two lengths perception with three fingers grasping. The results showed that within the length range of 40 similar to 100mm, the one length perception was better than two lengths length perception and in two length perception, better perception took place when shorter lengths were presented to the thumb and the index finger compared to being presented to the thumb and the middle finger. As a result of force sensor, grip forces show no significant difference in the range of stimulating length.

Singular properties of flow separation as a real cause of cavitation inception

S. Washio, S. Takahashi, K. Uemura, T. Iwamoto, T. Ogata

PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE 222 ( 4 ) 667 - 678 2008年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SAGE PUBLICATIONS LTD

At the very beginning stage of cavitation an infinitesimal cavity suddenly emerges and rapidly grows on the wall close to the point of flow separation. The present paper intends to make clear the mechanism of this peculiar phenomenon previously discovered by the present authors in oil flows, by experimentally examining the characteristics of a separating flow. First, pressure and temperature distributions along a cylindrical smooth wall in an oil flow were measured across the point of separation, which has proved that both tensile stress and heat are really generated near the separation point. Second, a laminar air flow passing over a sharp edge was inspected by particle image velocimetry (PIV). The inspection of the separating flow based on the PIV data has revealed that fluid particle near the separation point is not only drastically stretched but also intensely sheared along the separation streamline. With all the results integrated, it has been concluded that the singular structure of a separating flow is the real cause of both tensile stress and heat generation. When thus generated tension exceeds a threshold, it possibly breaks the adhesion between the liquid and the wall, leaving a microscopic rift on the interface that would grow to a visible cavity.

DOI： 10.1243/09544062JMES835

液中で接触する固体面の相対加速度運動に起因する空洞初生

鷲尾誠一, 高橋智, 村上健二, 多田達誠, 出口真次

日本機械学会論文集(B編) 74 ( 742 ) 1376 - 1385 2008年

記述言語：日本語出版者・発行元：一般社団法人日本機械学会

A contact motion between two solids in liquid can give birth to a cavity. To investigate the phenomenon, processes of cavity generation in a liquid between two walls making accelerated relative motions in their normal and tangential directions have been observed in detail, using microscopes and high-speed video cameras. Generation and subsequent expansion of a cavity are dominated by such various factors as the thickness of a liquid film, the acceleration of motion, the initial pressure, the liquid viscosity and the contact area. On the other hand the air solubility in oil influences, not the generation but the size of a bubble remaining after the process is over. The pressure in a liquid film between two parallel walls normally separating with a constant acceleration has also been theoretically analyzed, providing the basis for occurrence of tensile stresses in liquid films. Finally, the following idea has been proposed as a mechanism of the phenomenon ; a tensile stress occurring in a liquid film breaks the liquid-solid interface, producing a rift which can develop to a visible cavity. Considering liquid machines have many parts of solid-solid contact in liquid, it should be pointed out that some of the cavitations occurring in them can start from these cavities.

DOI： 10.1299/kikaib.74.1376

速度変化を伴う油の流れに生じる流動帯電現象の測定

高橋智, 祝守新, 鷲尾誠一, 田里友希

静電気学会 32 ( 1 ) 25 - 30 2008年

Unsteady Characteristics of Nonlinear Pressure Loss in a Flow through a Restrictor

Seiichi WASHIO, Huiqing CHEN, Satoshi TAKAHASHI

Journal of Fluid Science and Technology 3 ( 1 ) 11 - 21 2008年

記述言語：英語出版者・発行元：The Japan Society of Mechanical Engineers

To elucidate the unsteady characteristics of a nonlinear pressure loss generated in a restricted flow, pressure drops across and flow rates through an orifice were precisely measured in sinusoidally oscillating oil flows. It has turned out that the unsteady relationship between the nonlinear pressure loss and the flow rate describes a closed loop turning around along the characteristic curve of the steady-state one in the counter-clockwise direction, which indicates that the change of the nonlinear pressure loss is delayed behind that of the flow rate in an unsteady orifice flow. The phenomenon occurs probably because the structure of turbulence in an orifice jet flow, where a nonlinear pressure loss is generated by energy dissipation, has inertia against a change of the flow rate and cannot follow it without a time lag. A mathematical model incorporating a constant time lag into the steady-state nonlinear pressure loss was proposed to simulate the unsteady characteristics of the nonlinear pressure loss, successfully explaining the long-term question in acoustics why the reactive part of an acoustic orifice impedance decreases as the amplitude increases.

DOI： 10.1299/jfst.3.11

絶縁性流体と金属網との間の流動帯電基礎特性の実験的検討

高橋智, 祝守新, 鷲尾誠一, 藤原人司

日本機械学会論文集(C編) 73巻 ( 727号 ) 871 - 878 2007年

動特性モデル構築を目的としたポペット弁可変絞り非定常特性の実験的検討

鷲尾誠一, 陳恵青, 高橋智, 祝守新

日本機械学会論文集(C編) 2006年

油の正弦波変動流れにおける絞りの非定常な差圧－流量非線形特性の観察

陳恵青, 鷲尾誠一, 高橋智

日本機械学会論文集(B編) 72 ( 720 ) 1920 - 1926 2006年

記述言語：日本語出版者・発行元：一般社団法人日本機械学会

The present paper provides the discussions on the unsteady characteristics of a restriction flow in a hydraulic line. By ingeniously creating sinusoidal flow at a fixed orifice in a pipe, the unsteady relationships between the pressure drop across and the flow rate through the orifice were properly measured. When being estimated using the experimental results, the unsteady nonlinear pressure loss turned out to change against the flow rate describing a loop with a counter-clockwise hysteresis along the steady-state relation between the two. The finding, probably indicating that the structure of turbulence producing a nonlinear pressure loss in an orifice jet flow changes with a delay behind the change of flow rate, provides an answer to the long-pending question in acoustics; why the acoustic impedance of orifice decreases its reactive part as an amplitude of oscillation increases. A hypothetical mathematical model incorporating the delay into the steady-state relation was proposed to simulate the behavior of an unsteady nonlinear pressure loss in an orifice flow. The impedance analytically obtained by the model explained the decrease of reactance with an increasing amplitude.

DOI： 10.1299/kikaib.72.1920

キャビテーションの発達停留空洞を使った液体のオンライン脱気

鷲尾誠一, 高橋智, 上山恭平, 番匠谷勝之, 菊井翔太郎

日本機械学会論文集(B編) 2006年

油圧管路内脈動流における修正慣性差圧法を使った変動流量・圧力・インピーダンス同時測定の精度検証

陳恵青, 鷲尾誠一, 高橋智

日本機械学会論文集(B編) 71 ( 712 ) 2934 - 2940 2005年

Study on cavitation starting at the point of separation on a smooth wall in hydraulic oil flow

S Washio, S Takahashi, S Yoshimori

PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE 217 ( 6 ) 619 - 630 2003年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PROFESSIONAL ENGINEERING PUBLISHING LTD

Cavitation starting at the point of separation on a smooth cylindrical wall was observed. At the earliest stage of cavitation, a cavity suddenly emerged at the point of separation with its upstream tip attached to the wall. Differing from incipient cavities arising at projected edges, the present one neither stayed nor formed a stable bubble on the wall. As it moved slightly downstream, the newly born cavity underwent severe deformation: i.e. it grew explosively, then split and ultimately vanished in reverse from the tail back, in as short a period as one ten-thousandth of a second. Flashing light was emitted from the cavity as it expanded, and a transient electric charge was also detected from the oil downstream in synchronization with this light emission. Moreover, a streamline extending from the point of separation was spontaneously visualized. In order to establish the reasons for this visualization, temperature distribution across the streamline was measured, revealing that heat has to be generated at the separation point. Finally, the mechanism of tensile stress and heat generation at the point of separation is theoretically discussed on the basis of Landau's analysis of a boundary layer flow along a separation line.

DOI： 10.1243/095440603321919554

滑らかな面からはく離する油の流れにおける初生空洞が停留しないキャビテーションの観察

鷲尾誠一, 高橋智, 吉森修一

日本機械学会論文集(B編) 69 ( 681 ) 1120 - 1127 2003年

定圧下における気体の油に対する拡散現象のレーザ干渉計測

高橋智, 鷲尾誠一, 顧亜雄, 冨岡正稚, 辻竜彦, 吉田篤正

日本機械学会論文集(C編) 68 ( 666 ) 635 - 642 2002年

記述言語：日本語出版者・発行元：一般社団法人日本機械学会

The diffusion process of N_2, O_2 and CO_2 into VG10 machine oil had previously been observed in such a way as measuring the pressure change of gas confined to a constant volume with the oil. Although the measured pressure changes of N_2 and O_2 had been properly predicted by the diffusion theory, it had not been the case with CO_2. With suspicion that the dependency of a diffusion coefficient on the pressure could have influenced the results for CO_2, which exhibits a much larger pressure change in the course of diffusion than N_2 and O_2, the diffusion process was otherwise observed in the present study under a constant pressure, using laser heterodyne interferometry. The diffusion of CO_2 did not agree with its theoretical prediction again, which gave birth to an idea that a convective flow might occur in the oil by the density gradient produced by gas diffusion. Then Mach-Zehnder interferometry was introduced to observe gas-oil diffusion, proving natural convection did happen some time after the diffusion started. The diffusion process of CO_2 before the occurrence of natural convection agreed well with the theoretical prediction, giving reliable values of its diffusion coefficient.

DOI： 10.1299/kikaic.68.635

Study on the cavitation mechanism in hydraulic oil flow using a needle projection

S Washio, S Takahashi, S Kawahara, N Kishitani

PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY 216 ( J1 ) 27 - 34 2002年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PROFESSIONAL ENGINEERING PUBLISHING LTD

Cavitation occurring at a sharp projection in a hydraulic oil flow was observed in as much detail as possible, using, variously, a microscope, a high-speed video camera, laser beams, an electric charge detector and a photomultiplier. At the tip of the needle employed as a projection, a tiny cavity as small as several tens of micrometres in length suddenly emerged and would not go away. As cavitation became more vigorous, flashes occurred intermittently around the needle and positive electrical charges were generated which synchronized with the flashing. The electrode inserted downstream from the needle detected negative charge from the oil, which was also synchronous with the flashing. Observing the needle tip with the microscope made it possible to determine exactly the moment of cavitation inception, which turned out to depend on the oil temperature as well as the downstream pressure. All these findings tend to reinforce the 'rip-off' hypothesis previously proposed by the present authors for the cavitation mechanism.

DOI： 10.1243/1350650021543861

Study on cavitation inception in hydraulic oil flow through a long two-dimensional constriction

S Washio, S Takahashi, Y Uda, T Sunahara

PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY 215 ( J4 ) 373 - 386 2001年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PROFESSIONAL ENGINEERING PUBLISHING LTD

It is known that the traditional 'nucleus' theory for cavitation is incompatible with certain facts physically and experimentally recognizable in oil hydraulic flows. In order to re-examine this issue, cavitation of hydraulic oil flow through a long two-dimensional acrylic constriction was observed by various techniques: stroboscopic photography with a microscope, laser beam transmission, pressure and noise measurements, and luminescence and electrical charge detection. It was revealed that, at the incipient stage of cavitation, one stationary microscopic cavity always emerges suddenly on the inlet edge. Light emission was also observed in the cavitation together with electrostatic charge. All the findings taken together, which cannot be consistently explained by nucleus theory, lead to the following hypothesis: at the separation point a tensile force rips a liquid particle from the wall, leaving behind a vacuum space, which forms the incipient stationary cavity on the edge.

DOI： 10.1243/1350650011543619

温度勾配のある油の流れの研究（第１報粘度変化が流れに及ぼす影響）

鷲尾誠一, 南蓮, 高橋智, 比留井仁

日本油空圧学会論文集 32 ( 2 ) 27 - 32 2001年

E204 気-ゴム-油系における気体の透過量の測定(オーガナイズドセッション9 : 21世紀を拓く熱物性研究)

顧亜雄, 高橋智, 鷲尾誠一

熱工学講演会講演論文集 2001 519 - 520 2001年

記述言語：日本語出版者・発行元：一般社団法人日本機械学会

This paper deals with the measurement of quantities of gases such as nitrogen and carbon dioxide that penetrated through a rubber sheet into mineral oil by the means of combination of manometer and laser heterodyne interferometry. With N_2, the saturated solubility into the rubber is about equal to the one into the VG10 mineral oil, and diffusion coefficient is approximately 1/50 times smaller than VG10 mineral oil. The quantities of gas permeability of N_2 and CO_2 through rubber sheet increase with pressure and temperature.

DOI： 10.1299/jsmeptec.2001.0_519

Study of unsteady orifice flow characteristics in hydraulic oil lines

Seiichi Washio, Satoshi Takahashi, Yonguang Yu

Journal of Fluids Engineering, Transactions of the ASME 118 ( 4 ) 743 - 748 1996年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

A technique to measure fluctuating differential pressures with high fidelity has been developed first. When applied to detecting differential pressures generated by an accelerated or decelerated liquid column, the technique turned out to be effective in finding unsteady flow rates. An experimental study has been carried out on periodically changing hydraulic oil flows through an orifice. The results support the validity of the traditional standpoint that characteristics of an unsteady orifice flow can be approximately represented by those of a steady-state one. When inspected in detail, however, a net pressure loss across an orifice in a periodical flow is delayed against a change of the flow rate. The resulting relation between the pressure loss and the flow rate describes a loop with a counter-clockwise hysteresis and a nonlinear twist along the steady-state one. Pressure recovery in a pulsating orifice flow varies with the flow rate almost along the steady-state relation, which is confirmed when the change is not fast. © 1996 by ASME.

DOI： 10.1115/1.2835504

Measurement of transiently changing flow rates in oil hydraulic column separation

Seiichi Washio, Satoshi Takahashi, Satoshi Yamaguchi

JSME International Journal, Series B: Fluids and Thermal Engineering 39 ( 1 ) 51 - 56 1996年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Japan Society of Mechanical Engineers

Column separation and subsequent rejoining in an oil hydraulic line usually result in tensile waves and consequent ruptures in an oil column. In order to investigate these phenomena in more detail, it is essential to precisely measure transient flow rates in column separation and rejoining. The aim of the present work is to attain this objective: a method based on the theoretical relation of the flow rate change in a pipe with a kinetically induced pressure difference between the two separate sections. Instead of a conventional differential pressure transducer, two individual pressure gauges are used to measure pressures at the two sections and find the difference between them by subtraction. Theoretically predicted stepwise decreases of the flow rate until the column rejoining have been accurately measured, showing the effectiveness of the method. It is also pointed out that the successive calculus proposed by Zhao et al., which is expected to substantially economize the procedure to obtain flow rates from differential pressure data, may give unrealistic results.

DOI： 10.1299/jsmeb.39.51

PSDを使った下顎の三次元運動計測装置の開発査読

鷲尾誠一, 木尾正人, 高橋智, 山下敦, 矢谷博文

計測自動制御学会論文集 31 ( 9 ) 1279 - 1287 1995年9月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：The Society of Instrument and Control Engineers

It becomes necessary for dental diagnosis and treatment of patients having complaints with their temporomandibular joints to precisely measure motions of their lower jaws. Although such devices as can measure one-dimensional motions of a magnet attached to an examinee's incisor or 3-dimensional mandibular movements by means of mechanical displacement transducers have already been introduced into actual service, there has been great demand for more practical and reliable ones. The expected specifications of the device are as follows; (1) high accuracy and reliability, (2) 6 degree-of-freedom measurement covering wide range, (3) light and handy with little physical burden, (4) virtually real-time data processing. The present paper intends to develop a new mandibular examination device using PSD which can meet these demands as much as possible. The characteristic relation between the output voltages of a PSD sensor and the spatial position of a target LED, which relation basically dominates the accuracy of measurements, has been obtained on the basis of geometrical optics, proving through calibration that detecting errors remain less than 0.1mm with LED positions. The device has been constructed of two light duralumin arms which support three PSD detectors and three target LED's, respectively, and are to be fastened to the examinee's upper and lower dental arches. Test measurements of plane and rotational motions of the LED arm created by an automatic pulse stage have revealed the accuracy and usefulness of the device; average deviations between measured and programed trajectories were within 0.2mm. Applications of the device to two subject examinees, one is normal and the other has a temporomandibular joint disorder, have been successful, showing its effectiveness as a examination device. With the electronic system and PC used, it took 30 seconds to conduct one whole run for an examinee, from the start to the final acquisition of graphical data display on CRT.

DOI： 10.9746/sicetr1965.31.1279

油の液柱分離における過渡変動流量の測定査読

鷲尾誠一, 高橋智, 山口智史

日本機械学会論文集(B編) 60 ( 574 ) 2081 - 2088 1994年6月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：The Japan Society of Mechanical Engineers

Oil column separation in which a tensile wave and the consequent rupture of an oil column can be observed provides intriguing information with cavitation study. In order to investigate the phenomena in more detail from this viewpoint, it is essential to secure a means to precisely measure transiently changing flowrates in column separation. The present paper has aimed to achieve this object ; the method is based on detecting pressure differences kinematically induced in an unsteady pipe flow. Instead of a conventional pressure difference transducer, two independent pressure gauges are used to pick up the pressure differences with high fidelity. Theoretically predicted step-like flowrates until the column rejoining have been successfully measured, showing the usefulness of the method. It is also pointed out that the algorithm adovocated by ZHAO et al. to conveniently transform sampled pressure difference data to flowrate can give unreasonable results when the transient is fast.

DOI： 10.1299/kikaib.60.2081

MEASUREMENT OF THERMODYNAMIC QUANTITIES OF MINERAL-OIL BY LOASER INTERFEROMETRY

S WASHIO, S TAKAHASHI, M KANAMITSU, A YOSHIDA

PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE 208 ( 4 ) 267 - 274 1994年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：MECHANICAL ENG PUBL LTD

In previous attempts to find bulk modulus of liquids, the difficulty has always been in how to accurately measure minute volumetric changes in the fluids when pressure changes. The present paper describes the application of laser interferometry to this measurement in a mineral oil in order to develop a more reliable substitute for the conventional methods. Firstly, the basic relationship between density and refractive index of the oil was established by the use of the interference fringe method. Thereafter, the heterodyne interferometer was used to measure thermodynamic changes of state in the oil, giving adiabatic and isothermal compressibilities, specific heats at constant pressure and at constant volume, and specific heat ratio. The velocity of sound in the oil derived from adiabatic compressibility thus obtained agrees well with that determined experimentally through wave transmission tests. The same interferometer has also been shown to be applicable to the measurement of pulsating pressures in oil.

DOI： 10.1243/PIME_PROC_1994_208_126_02

ヘルムホルツ共鳴器型油圧脈動フィルタの研究査読

鷲尾誠一, 高橋智, 向畑和男, 山口智史

油圧と空気圧 24 ( 6 ) 729 - 735 1993年9月

油柱を伝わる張力波の創出と観測

鷲尾誠一, 高橋智, 小西忠孝, 守分均

日本機械学会論文集(B編) 58 ( 547 ) 779 - 784 1992年

記述言語：日本語出版者・発行元：The Japan Society of Mechanical Engineers

Tensile stresses in liquids are not necessarily a familiar idea in fluid engineering, so much less accepted is the reality of tensile waves travelling through a liquid continuum. The present paper aims at giving evident proof for the premise. In a pipe with its end closed, branching from the main line where column separation is started, alternating tensile and compressive waves have been beautifully created and measured. It has turned out that the ordinary viscous wave equation can properly predict the time profiles of the masured pressures, which reveals that a tensile wave propagates in oil at the same speed as a compressive one. The observations by use of a transparent acrylic tube have also revealed the rupturing of an oil column under an excessive transient tensile stress; in the aftermath there has emerged a bubble which is usually mistaken for the cause of cavitation, but is actually brought about by diffusive separation of gas from the oil into the rupture.

DOI： 10.1299/kikaib.58.779

Diffusion Mechanism of Gases Contained in Oiles (2nd Report): Study on Diffusion of Nitrogen into/out of oil 査読

T. Konishi, M. Baba, S. Deishi, S. Takahashi

Japanese Journal of Tribology 35 ( 12 ) 1375 - 1383 1990年12月

油中含有気体拡散機構の研究(第2報)-窒素の油中拡散- 査読

小西忠孝, 馬場充, 出石聡史, 高橋智

トライボロジスト 35 ( 12 ) 872 - 877 1990年

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