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6. Clarify Sit-to-Stand Muscle Synergy and Tension Changes in Subacute Stroke Rehabilitation by Musculoskeletal Modeling

Author

Wang, Ruoxi, primary, An, Qi, additional, Yang, Ningjia, additional, Kogami, Hiroki, additional, Yoshida, Kazunori, additional, Yamakawa, Hiroshi, additional, Hamada, Hiroyuki, additional, Shimoda, Shingo, additional, Yamasaki, Hiroshi R., additional, Yokoyama, Moeka, additional, Alnajjar, Fady, additional, Hattori, Noriaki, additional, Takahashi, Kouji, additional, Fujii, Takanori, additional, Otomune, Hironori, additional, Miyai, Ichiro, additional, Yamashita, Atsushi, additional, and Asama, Hajime, additional

Published
2022
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8. Defect Detection in Multiple Product Variants Using Hammering Test with Machine Learning.

Author

Yamashita, Yosuke, Yoshida, Kazunori, Kishita, Yusuke, and Umeda, Yasushi

Subjects
MANUFACTURING defects, NONDESTRUCTIVE testing, MACHINE learning, HAMMERS, TRANSFER of training, KNOWLEDGE transfer
Abstract

Various nondestructive testing (NDT) methods have been proposed to detect defects inside products. The hammering test is an NDT technique widely used for this purpose. In this test method, a worker judges whether a part is defective or not by listening to the sound after hitting the product with a hammer. Conventional research has shown that a classifier using machine learning can discriminate the hammering data with high accuracy. However, to use these machine learning methods, a lot of samples are needed for learning. In actual industrial situations, it is difficult to collect a lot of samples of defective products. Regarding the hammering test, a machine learning method that can correctly discriminate defective products without sample data has not been proposed. This study aims to construct a system that can correctly discriminate the hammering test data even when there are no defective samples. We propose a method using 'transfer learning.' We conducted case studies to demonstrate the effectiveness of the proposed method using two variants of a brazed product. First, we verified the effectiveness of normal machine learning in a hammering test. In this study, we succeeded in discriminating brazed products, which were not correctly discriminated by the workers. We then applied the proposed method to brazed products. We succeeded in discriminating a variant of the brazed products by transferring the knowledge learned from another variant of the brazed products. [ABSTRACT FROM AUTHOR]

Published
2022
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10. Analysis of Muscle Activity in the Sit-to-Stand Motion When Knee Movability is Disturbed.

Author

Yoshida, Kazunori, An, Qi, Hamada, Hiroyuki, Yamakawa, Hiroshi, Tamura, Yusuke, Yamashita, Atsushi, and Asama, Hajime

Subjects
*KNEE, *ELECTROMYOGRAPHY, *QUALITY of life
Abstract

Sit-to-stand motion is an important daily activity, and disability of motion can significantly reduce quality of life. Therefore, it is important to understand the mechanism of sit-to-stand motion in order to prevent such scenarios. The sit-to-stand motion was found to be generated by four muscle groups, through muscle synergy. However, it is unclear how muscle synergy can be controlled. Human sit-to-stand motion may be planned based on body condition before motion. In this study, we aimed to clarify the relationship between body condition and muscle activity during the sit-to-stand motion. Accordingly, we measured the muscle activity when knee movability was disturbed as a condition of body change. We also measured the muscle activity during normal sit-to-stand motion and sit-to-stand motion with disturbed knee movability using surface electromyography. Subsequently, we extracted the muscle synergy from the measured muscle activity and compared the activity levels of muscle synergy. The results revealed that muscle activity contributing to forward bending increased and that contributing to the rise of the hip and stabilization decreased when knee movability was disturbed. These results suggest that humans compensate for disturbed knee movability with forward momentum and bending motion. Moreover, this implies that humans adjust their motion to various environments or body conditions by adjusting the level of forward bending activity. [ABSTRACT FROM AUTHOR]

Published
2022
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11. Classification of Motor Impairments of Post-Stroke Patients Based on Force Applied to a Handrail

Author

An, Qi, primary, Yang, Ningjia, additional, Yamakawa, Hiroshi, additional, Kogami, Hiroki, additional, Yoshida, Kazunori, additional, Wang, Ruoxi, additional, Yamashita, Atsushi, additional, Asama, Hajime, additional, Ishiguro, Shu, additional, Shimoda, Shingo, additional, Yamasaki, Hiroshi, additional, Yokoyama, Moeka, additional, Alnajjar, Fady, additional, Hattori, Noriaki, additional, Takahashi, Kouji, additional, Fujii, Takanori, additional, Otomune, Hironori, additional, Miyai, Ichiro, additional, and Kurazume, Ryo, additional

Published
2021
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17. Tsukuba 情動系ラットの作業記憶能力について : 物体認知課題による検討

Author

Yoshida, Kazunori

Subjects
genetic structures, Tsukuba emotional strain rat, spontaneous behavior, working memory, object recognition task
Abstract

The author conducted a study to examine the“ pure" working memory ability of Tsukuba High (H) and Low (L) emotional strain rats using an object recognition task in comparison of that of Wistar (W) strain rats similarly examined as a control. The study consisted of two sessions. In the first session, the rats were each subjected to a first trial for exposure to two identical objects (samples) for two minutes, followed (with a delayed time of five minutes) by a second trial in which they were each exposed to two different objects; one the same object as used in the first trial (familiar as the sample) and the other a novel object, for two minutes, to measure the time spent by each rat for spontaneous exploration of both objects in each of the first and second trials. 48 hours after the end of the first session, the second session was performed on the rats in the same manner as in the first session, except using different objects from those used in the first session. The results of the study can be summarized as follows: the H and W rats spent significantly longer time for exploration of the novel objects than the familiar objects, while the L rats showed no such tendency; and the habituation components (h1, h2) and mnemonic components (d2, d3) of the L rats were significantly lower than those of the H and W rats. From the above, it was concluded that the L rats were inferior to the H and W rats, not only in their spatial working memory ability, but also in their non-spatial visual working memory ability.

Published
2014

19. Veriflcation of Spatial Working Memory Ability in Tsukuba Emotional Strain Rats

Author

Yoshida, Kazunori

Subjects
delayed task, Tsukuba emotional strain rats, spatial working memory
Abstract

So far, the spatial learning ability of Tsukuba emotional strain rat was examined using the water maze which needed only reference memory and eight-arm radial maze that needed both working memory and reference memory. As a result, the performances of Tsukuba low emotional strain (L) rat were worse than those of Tsukuba high emotional strain (H) rat only in eight-arm radial maze task, and then the working memory disturbance of the L rat was suggested. The present study inserted a delay problem by eight-arm radial maze learning process, in order to verify more strictly the working memory ability in both H and L rat. Obtained results summarized as follows; although the number of the trials until insertion of the delay problem in L rat were less than those in H rat, the false choice rate in the flrst choice after the flve-minutes delay was higher, and the number of the trials until the learning criterion signiflcantly increased in L rat, and then the working memory disturbance of the L rat became clearer. And it was thought that the cause of the spatial learning disturbance of L rat might be a deflcit of the working memory capacity.

Published
2013

20. The Characteristics of the Social Cognitive Behaviors towards the Stranger Rat in Tsukuba High and Low Emotional Strain Rat

Author

Yoshida, Kazunori

Subjects
stranger rat, Tsukuba emotional strain rats, social cognitive behavior
Abstract

The present study examined the characteristics of the social cognitive behaviors, that is, various active or passive behaviors towards stranger rat (Long-Evans strain rat: L-E), in Tsukuba high(H) and low(L) emotional strain rat. As forms of active behavior, the approaching, sniffi ng, followup behavior and attack behavior towards L-E rats were observed for ten minutes in an adapted square open-fi eld device (80×80×30cm), in which an H or L rat was placed on a diagonal line with respect to an L-E rat. Observations were divided between the fi rst fi ve minute and the second fi ve minutes. Escape and defense behaviors as forms of passive behavior were also observed in the same way. As a result, H rats showed a variety of defense behaviors, as expected. However, a greater number of approaching and attack behaviors was recognized in H rats than in L rats. This tendency was particularly remarkable in H female rats. In contrast, L rats demonstrated many follow-up behaviors, but exhibited only little attack behavior. Therefore, it was suggested that the social cognitive behaviors of the Tsukuba emotional strain rat in a nonresident one to one situation were different from those seen in a resident or group colony.

Published
2011

21. The Relationship between the Performances of the Spatial Learning and the Hippocampal Morphology in Tsukuba Emotional Strain Rats: With Special Reference to the Effects of the Bleeding Environment Condition

Author

Yoshida, Kazunori

Subjects
Tsukuba emotional strain rats, spatial learning, hippocampal morphology, breeding environment
Abstract

The present study had a twofold purpose, to examine the relationship between the performance of the spatial learning and the morphological change of the hippocampus of Tsukuba emotional strain rats, and to ascertain how breeding environment condition would affect this relationship. The results of the experiments showed that the number of trials achieved during spatial learning of Tsukuba low emotional strain rats housed under enriched breeding conditions (the RL group) significantly decreased in comparison with that of Tsukuba low emotional strain rats under a standard breeding conditions (the SL group), demonstrating a clear effect of improvement on the spatial learning performance in terms of environmental enrichment. Further, the morphological studies of the hippocampus in the rats were conducted, with the outcome in which the volume ratio of the dorsal hippocampus for the whole hippocampus notably declined in the SL group. It was also revealed that the volume ratio of the dentate gyrus for the dorsal hippocampus in the SL group quite lowered comparing with that in the other group. Moreover, the findings displayed a negative correlation between the number of trials achieved in spatial learning and the volume ratio of the dentate gyrus in the L groups (both the SL and RL groups). Therefore, the neural network including the neurogenesis of the granule cell in the dentate gyrus was considered as one of the factors with reference to the disabilities of spatial learning seen in the SL group as well as the causes of the increase in the volume ratio in the dentate gyrus observed in the RL group.

Published
2010

22. Characteristics of the Circadian Running-Wheel Activity Rhythm in Tsukuba Emotional Strain Rats

Author

Yoshida, Kazunori

Subjects
Tsukuba 情動系ラット, 輪回し行動, 明暗条件, 概日リズム, 多動性
Abstract

本実験は,Tsukuba 情動系ラットの中で,特に,Tsukuba 低情動系(L系)ラットの概日リズムの特徴を明らかにするために,12:12時間明暗条件下で1ヶ月間の自発的輪回し行動を2時間毎に連続で観察した.その結果,Tsukuba 高情動系(H系)ラットは,統制群である雑種のWistar 系(W系)ラットの活動パターンとほぼ同様であったのに対して,L系ラットは,H系やW系ラットとは明らかに異なる活動パターンを示した.すなわち,L系ラットは実験開始から徐々に活動量が増加し,活動ピークに達するまでに期間が有意に延長し,最終的な総活動量はH系ラットより約4倍,W系ラットより約3倍に達していた.また,暗期での活動ピークが,W系やH系ラットでは,暗期の各時間帯に分布しているのに対して,L系ラットでは暗期直後の2時間(20時～22時)に活動ピークが集中する傾向が認められた.さらに,ほぼ毎日,暗期に移行する2時間前の明期(18時～20時)から活動が増加することがすべてのL系ラットで観察された.これらの結果から,L系ラットの多動性と同時に特異な概日リズムの証拠が得られた.今後は,これらのL系ラットの概日リズムの特異性を明らかにするために,脳内中枢と言われている視交叉上核の構造的変化と同時に,恒暗条件下での光刺激に対する概日リズムの位相反応などを検討する必要がある.

Published
2009

23. Effective de novo assembly of fish genome using haploid larvae

Author

Iwasaki, Yuki, primary, Nishiki, Issei, additional, Nakamura, Yoji, additional, Yasuike, Motoshige, additional, Kai, Wataru, additional, Nomura, Kazuharu, additional, Yoshida, Kazunori, additional, Nomura, Yousuke, additional, Fujiwara, Atushi, additional, Kobayashi, Takanori, additional, and Ototake, Mitsuru, additional

Published
2016
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24. Yarn Velocity Measurement Using Optical Correlation Method

Author

Yoshikatu Kisanuki and Yoshida Kazunori

Subjects
Optics, Materials science, Polymers and Plastics, business.industry, Materials Science (miscellaneous), visual_art, visual_art.visual_art_medium, Yarn, Optical correlation, business, Velocity measurement, Industrial and Manufacturing Engineering
Published
1997

26. Velocity fluctuation of weft in an air jet loom. Measurement with a laser-Doppler Velocimeter

Author

Susumu Kawabata, Suzuki Fujio, Yoshida Kazunori, and Junzo Hasegawa

Subjects
Engineering, Polymers and Plastics, business.industry, Materials Science (miscellaneous), Mechanical engineering, business, Air-jet loom, Industrial and Manufacturing Engineering
Abstract

目的 レーザドップラ速度計 (LDV) を糸速測定に適用した場合の出力信号特性を明らかにする.とともに, よこ入れ試験機を用いて, よこ入れ過程の糸速変化の全般的な状況, 噴射終了段階の糸速変動状況, 並びにノズルの噴射条件とこれらの状況との関連性について調べる.成果 ドップラ信号の特性は糸の表面状態に依存し, 紡績糸の場合毛羽がシードの役割を果たすため, フィラメント糸に比べSN比が良好である.又, トラッカ出力 (速度信号) には10kHzに及ぶ不規則なノイズが重畳しており, 糸速波形の観測を行うに際しては高周波数域のノイズをローパスフィルタにより除去する必要がある.よこ糸にポリエステル・綿混紡糸45s (P/C45s) を用いた場合, このノイズは約2m/s (rms) 程度で, 2kHzのローパスフィルタを用いるとそのレベルは半減することが明らかとなった.エアプール方式において, グリッパ開放開始時及び自由噴射終了時には, 張力波の伝播に起因する特徴的な糸速変動が生じている.又, 飛走中の糸のゆるみ量及び自由噴射終了時の張力ピーク値の低減には, 供給速度をよこ入れ前中期で高め, かっ自由噴射後期で減らすように設定することが有効である.このような供給速度はメインノズルの圧力をよこ入れ前期で高めることにより実現できるが, 紡績糸 (特に単糸) の場合には解撚による糸切れの問題もあり注意を要する.

Published
1991

27. A Case of Pyloric Stenosis in Crohn's Disease

Author

Kono, Masato, Yoshida, Kazunori, Tsukiyama, Masayuki, Yamashita, Akihiko, Kiso, Mitsunori, Matsui, Toshiyuki, Koyama, Ikuho, Kawasaki, Sukenori, Yoshioka, Kazuyoshi, Mizushima, Mutsue, and Imai, Hiroyuki

Published
1990

28. Construction of a high-coverage bacterial artificial chromosome library and comprehensive genetic linkage map of yellowtail Seriola quinqueradiata

Author

Fuji, Kanako, primary, Koyama, Takashi, additional, Kai, Wataru, additional, Kubota, Satoshi, additional, Yoshida, Kazunori, additional, Ozaki, Akiyuki, additional, Aoki, Jun-ya, additional, Kawabata, Yumi, additional, Araki, Kazuo, additional, Tsuzaki, Tatsuo, additional, Okamoto, Nobuaki, additional, and Sakamoto, Takashi, additional

Published
2014
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31. Quantitative Trait Loci (QTL) Associated with Resistance to a Monogenean Parasite (Benedenia seriolae) in Yellowtail (Seriola quinqueradiata) through Genome Wide Analysis

Author

Ozaki, Akiyuki, primary, Yoshida, Kazunori, additional, Fuji, Kanako, additional, Kubota, Satoshi, additional, Kai, Wataru, additional, Aoki, Jun-ya, additional, Kawabata, Yumi, additional, Suzuki, Junpei, additional, Akita, Kazuki, additional, Koyama, Takashi, additional, Nakagawa, Masahiro, additional, Hotta, Takurou, additional, Tsuzaki, Tatsuo, additional, Okamoto, Nobuaki, additional, Araki, Kazuo, additional, and Sakamoto, Takashi, additional

Published
2013
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33. Reply

Author

Yoshida, Kazunori, primary, Tobe, Satoshi, additional, and Yamaguchi, Masahiro, additional

Published
2007
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45. Combination Therapy with an Angiotensin-Converting Enzyme (ACE) Inhibitor and a Calcium Antagonist: Beyond the Renoprotective Effects of ACE Inhibitor Monotherapy in a Spontaneous Hypertensive Rat with Renal Ablation.

Author

KANAZAWA, Masayuki, primary, KOHZUKI, Masahiro, additional, YOSHIDA, Kazunori, additional, KUROSAWA, Hajime, additional, MINAMI, Naoyoshi, additional, SAITO, Takao, additional, YASUJIMA, Minoru, additional, and ABE, Keishi, additional

Published
2002
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49. Clinicopathological Study of Canine Oral Epulides.

Author

Yoshida, Kazunori, primary, Yanai, Tokuma, additional, Iwasaki, Toshio, additional, Sakai, Hiroki, additional, Ohta, Jyoji, additional, Kati, Shingo, additional, Mikami, Takeo, additional, A. Lackner, Andrew, additional, and Masegi, Toshiaki, additional

Published
1999
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