Faculty Profiles - MAEDA Yoshinobu

MISC - MAEDA Yoshinobu

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Artificial class game composed of agents using preferential attachment

TOMIOKA Shizuka, SATO Terutaka, MAEDA Yoshinobu, ITO Nao, TANI Kentaro, KATO Kosuke

IEICE technical report 110 ( 384 ) 37 - 42 2011.1

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

In order to solve the bullying problem, we have proposed an artificial class model based on the machine agents. In the artificial class, every agent performs the interaction with others, such as the conformity, the inclusion, the exclusion and the distinction, to make friends with having the coincidence on the sense of values. In this report, we introduced a preferential attachment to generate a lot of groups. Furthermore, using the Bayesian update, the action of the agents was improved to make it mimic the human action, to be possible that a human player participates in the artificial class as the gaming simulation.

B1 Extracting the foot position parameter that influence the maximum pronation

ONO Satoshi, HAYASHI Toyohiko, MAEDA Yoshinobu, IIJIMA Atsuhiko, KIRYU Toru

The Proceedings of the Symposium on sports and human dynamics 2011 ( 0 ) 261 - 265 2011

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Excessive pronation in running is known to be one of the dominant causes of running injuries. In order to prevent it, the trilateral relationship of pronation, foot anatomy, and shoe structure has been studied in detail up to now. In addition, we assumed that the foot position at the heel contact (HC) and running speed could also affect pronation significantly. Then, we studied the relationship among foot motion, shoe sole stiffness and running speed using a multi-regression analysis. We conducted several experiments using 11 experienced runners, an optical motion capture system, a treadmill with two different speed and two types of running shoes with different inner-sole stiffness. Consequently, in low-stability shoe, pronation could be estimated primarily by foot position at HC and this relationship between them depended upon running speed. In high-stability shoe, on the other hand, the same relationship could not hold, probably due to other primary personal factors.

Efficacy evaluation of parameter optimization for a Cartesian scanning method alternative to mouse-pointer manipulation

13 65 - 70 2011

Measurement of the position and orientation of the humerus using a combination of fluoroscopic image and 2D-3D registration

NAGASAWA Noriaki, HAYASHI Toyohiko, TANAKA Hiroshi, KOMAI Masahiko, NINOMIYA Hiroki, MAEDA Yoshinobu, WATANABE Tetsuya, NOBUHARA Katsuya

IEICE technical report 110 ( 294 ) 75 - 80 2010.11

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

Video Fluoroscopy (VF) is widely used in clinic for recording in-vivo shoulder joint motions in two dimensions. In order to achieve VF-based 3-D measurement, a method using a combination of fluoroscopic image and a 3-D model of the bone has been developed by using a 2D/3D registration technique. Since its measurement accuracy depends on the bone shape and other measurement conditions, the measurement accuracy of the humeral position and orientation also has to be validated before measurement. To achieve this, we developed an empirical system using a humeral bone model, a bone-fixation equipment with high reproducibility and an X-ray projection calibration frame. Using this system, we validated the accuracy in the three different humeral orientations within the scapula plane with an elevation angle of 30[deg], 60[deg] and 90[deg]. The accuracy in the orientation was verified to be less than 1 [deg] on average in adduction/abduction and horizontal adduction/abduction, and to be less than 4[deg] on average in internal and external rotation. The accuracy in the position was verified to be less than 1[mm], 2[mm] and 5[mm] on average in the supero-inferior, medio-lateral and antero-posterior positions, respectively.

Other Link： http://search.jamas.or.jp/link/ui/2011101861

Development of Entertainment Game (Rotation Shogi) using Speech-Output Interface

MURAYAMA Naoki, TANI Kentaro, ITO Nao, MAEDA Yoshinobu

IEICE technical report 110 ( 221 ) 121 - 125 2010.10

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

A wide range of assistive technologies to support the visually impaired persons have been developed to enhance the activities of daily living (ADL). However, enhancing not only the ADL but also the quality of life (QOL), such as an entertainment game, is needed to relieve some of their stress. Such games should be developed from the following two viewpoints; One is that the visually impaired persons are on an equality with the sighted persons at the game whether they win or not. The other is that the game must be played without visual information by the players, and, as such, must be played using only auditory information as one of the alternative perceptions of the visual cue. In this report, we developed Japanese backgammon type game played by four players, so-called, Japanese rotation shogi, using the speech-output interface. In the experiment, four players, composed of two sighted and two visually impaired, were evaluated by the Csikszentmihalyi's flow.

Development of Entertainment Game (Rotation Shogi) using Speech-Output Interface

MURAYAMA Naoki, TANI Kentaro, ITO Nao, MAEDA Yoshinobu

IEICE technical report 110 ( 219 ) 121 - 125 2010.10

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

A wide range of assistive technologies to support the visually impaired persons have been developed to enhance the activities of daily living (ADL). However, enhancing not only the ADL but also the quality of life (QOL), such as an entertainment game, is needed to relieve some of their stress. Such games should be developed from the following two viewpoints; One is that the visually impaired persons are on an equality with the sighted persons at the game whether they win or not. The other is that the game must be played without visual information by the players, and, as such, must be played using only auditory information as one of the alternative perceptions of the visual cue. In this report, we developed Japanese backgammon type game played by four players, so-called, Japanese rotation shogi, using the speech-output interface. In the experiment, four players, composed of two sighted and two visually impaired, were evaluated by the Csikszentmihalyi's flow.

Development of Entertainment Game (Rotation Shogi) using Speech-Output Interface

MURAYAMA Naoki, TANI Kentaro, ITO Nao, MAEDA Yoshinobu

IEICE technical report 110 ( 220 ) 121 - 125 2010.10

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

A wide range of assistive technologies to support the visually impaired persons have been developed to enhance the activities of daily living (ADL). However, enhancing not only the ADL but also the quality of life (QOL), such as an entertainment game, is needed to relieve some of their stress. Such games should be developed from the following two viewpoints; One is that the visually impaired persons are on an equality with the sighted persons at the game whether they win or not. The other is that the game must be played without visual information by the players, and, as such, must be played using only auditory information as one of the alternative perceptions of the visual cue. In this report, we developed Japanese backgammon type game played by four players, so-called, Japanese rotation shogi, using the speech-output interface. In the experiment, four players, composed of two sighted and two visually impaired, were evaluated by the Csikszentmihalyi's flow.

二段型CPG電子回路モデルのPF層を除く簡約化について

金子怜史, 久保田真仁, 前田義信, 林豊彦, 加納慎一郎, 塚田章

生体医工学シンポジウム2010 2010.9

Improvement of thyroid hormone control system in tail resorption program of Xenopus laevis

Sasaki Akiyoshi, Izutsu Yumi, Maeda Yoshinobu, Hayashi Toyohiko

IEICE technical report 110 ( 52 ) 7 - 11 2010.5

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

Tail resorption takes place during metamorphosis in Xenopus laevis. Tail resorption has been thought to be controlled by a programmed cell death. However, we think tail resorption is controlled by a immune system. We proposed, then, a model of Thyroid hormone control system to analyze the tail resorption program. This model was not included Thyroid hormone receptor (TR), that is thought to be key factor of amphibian metamorphosis. In this report, we add TR to the model.

An Experimental Study on Legibility of Braille Characters for Beginners

MURAKAMI Shiori, WATANABE Tetsuya, MAEDA Yoshinobu, YAMAGUCHI Toshimitsu

IEICE technical report 110 ( 53 ) 9 - 14 2010.5

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

At the first stage of braille learning, it is preferable to use braille characters which are easy for beginners to read tactually. This is the motive for exploring such braille characters through an experiment. The experimental results showed that braille characters with less than three dots, space in the second row, or a simple arrangement of dots were read with short reading times. At the same time, it was found that beginners tend to misunderstand the angle of the dotted lines and miss the space in the second row. Based on these results, we discussed the relationship between the arrangement of the dots and the reading time and the application of the experimental results to braille educational textbooks.

Activities of Niigata IT Support Center for Persons with Disabilities : Current Status and Future Tasks of IT Support System in Niigata City

YAMAGUCHI Toshimitsu, MARUYAMA Satoko, HAYASHI Toyohiko, WATANABE Tetsuya, MAEDA Yoshinobu

IEICE technical report 110 ( 53 ) 79 - 82 2010.5

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

IT support centers for persons with disabilities in local areas have a small number of staff members and volunteers as well as clients. This situation makes it difficult to supply high quality services continuously. Additionally, large support areas make it difficult for the supporters to travel over to the users, vice versa, in terms of cost and time. This paper describes the current status of one of local support centers, Niigata IT Support Center for Persons with Disabilities, to share and discuss the tasks with other local support centers.

Simulation on the small-world network of Noble equation

KOMATSU Kouki, KIRYU Yuichiro, MAEDA Yoshinobu, HAYASHI Toyohiko

IEICE technical report 110 ( 52 ) 31 - 34 2010.5

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

A cardiac cell keeps the potential plateau in the absolute refractory period, and, as a result, peculiar behaviors are observed in the coupling system of the cells. Meunier showed the so-called acceleration phenomenon whereby the oscillation accelerated after coupling of the Hodgkin-Huxley type models. Maeda et al. showed that energy consumption can be reduced when the acceleration phenomenon is observed, from the study using hardware models. In this report we investigated that, when the coupling system formed as the ring lattice network was replaced with the small-world network, two reductions of the period and the energy consumption simultaneously occur on the diffusively coupling of 20 Noble equations which are Hodgkin-Huxley type models of the cardiac cell.

Other Link： http://search.jamas.or.jp/link/ui/2010257402

A semi-automatic extraction of the contour of the articular cartilage from MR images of the knee

SATO Hiroki, HAYASHI Toyohiko, OMORI Go, WATANABE Satoshi, SASAGAWA Keisuke, MAEDA Yoshinobu, WATANABE Tetsuya

IEICE technical report 110 ( 52 ) 41 - 46 2010.5

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

Knee motion analysis has many clinical applications such as diagnosis of knee diseases and evaluation of postoperative knee functions. For analyzing knee motion in three-dimensions, a 3-D model based approaches were introduced recently by combining a fluoroscopic image-sequence of knee motion and a 3-D model of related knee bones. In order to expand such analysis into that including the articular cartilage, we need a 3-D model of the cartilage as well as bones. Then this paper proposed a semi-automatic extraction of cartilage contour in MR images. This extraction method has an advantage that a contour of the cartilage partly unclear in MR image can be estimated iteratively by using a function of evaluating the overall difference between present contour and that estimated from its neighboring gray distribution, from an initial contour roughly digitized manually. To evaluate its validity, we carried out several experiments using two different MR images of the knee. All empirical results suggested that our method would have a potential of easily extracting an accurate contour of the cartilage with high reproducibility.

Other Link： http://search.jamas.or.jp/link/ui/2010257404

A quantitative evaluation of pitcher's pectoral tension during baseball pitching

ITO Ryo, HAYASHI Toyohiko, MAEDA Yoshinobu, WATANABE Tetsuya, NAKAMURA Yasuo, TANAKA Hiroshi, NINOMIYA Hiroki, KOMAI Masahiko, NOBUHARA Katuya

IEICE technical report 110 ( 52 ) 19 - 24 2010.5

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

In baseball pitching, pitcher's pectoral tension is believed to be effective to accelerate the upper extremity. Then a term "pectoral tension" is frequently used subjectively in baseball training scenes. But its definition is still unclear, limiting its use in quantitative evaluation of pitching motion. In order to eliminate such limitation, we proposed an independent parameter capable of evaluating pitcher's pectoral tension quantitatively. The parameter is defined as the area of a triangle formed by three marker points attached over the acromion, the manubrium of sternum and the processus xiphoideus. In order to evaluate its validity, we first introduced three necessary conditioned that the parameter should satisfy as follows 1) the non-throwing shoulder is in the horizontal flexion; 2) the hips rotate clockwise quickly relative to the chest when the area is maximized on the non-throwing side; 3) the maximum area is not correlated to the horizontal flexion/extension of the shoulder on the throwing side. Experiments using 15 adult and 15 young volunteers demonstrated that the proposed parameters satisfied all the conditions, suggesting its validity in pitching training.

Automatic adjustment of bite force according to food texture in chewing-like jaw movement of autonomous jaw-movement simulator JSN/3A

KAWATA Mitsuhiro, HAYASHI Toyohiko, NAKAJIMA Shinichi, INOUE Makoto, MAEDA Yoshinobu, WATANABE Tetsuya

16 ( 2 ) 132 - 133 2010.2

Reduction of the reciprocal inhibition based hardware neuronal network

KANEKO Satoshi, SOZUKA Takuya, MAEDA Yoshinobu, HAYASHI Toyohiko

IEICE technical report. Signal processing 109 ( 435 ) 233 - 234 2010.2

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

A central pattern generator (CPG) is a half-center rhythm generator, which is constructed from neural networks of the mammalian spinal cord. The CPG generates rhythmic locomotion. Thus it can transmit alternating rhythmic activity of extensor and flexor sites, in the absence of external rhythmic input. This mechanism contributes to generate involuntary walking patterns of the mammalian. In this study, we rearranged the CPG structure of locomotion pattern generation, and, as such, divided the circuit system into four categories with preserving the dynamics.

Parameter optimization of Cartesian-cursor method in scanning mouse emulations alternative to mouse manipulation

ISHIKAWA Shingo, KOYAMA Kenji, HAYASHI Toyohiko, MAEDA Yoshinobu, WATANABE Tetsuya, NAKAMURA Yasuo, WAKABAYASHI Yuko, TONDOKORO Naoki

IEICE technical report 109 ( 358 ) 35 - 40 2010.1

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

Personal computers are indispensable for persons with severe motor disabilities to ensure communication and social participation. For poinier operation, they usually use a scanning mouse emulator together with a single switch. As a typical emulator, Cartesian-cursor method is widely used in most interface software assisting computer operation. Several parameters of the method, however, have been determined based on empirical knowledge or on a trial-and-error basis. In order to determine them from user's physical ability, we investigated the relations between parameter values and total operation time by means of computer simulation in this study. If user's response time is given empirically, we already proposed how to optimize the speed of cursor movement and focus stationary time in a previous study. In addition, this study demonstrated that the ratio of high speed to low speed and the travel distance of the cursor before acceleration can also be optimized.

Performance evaluation of control-interface switch GSN/1 using a geomagnetic sensor

12 13 - 18 2010

Knee Motion Parameters for Evaluating Muscle Fatigue during Parallel Squatting

ONUKI Takashi, KIRYU Tohru, HAYASHI Toyohiko, MAEDA Yoshinobu, WATANABE Tetsuya

IEICE technical report 109 ( 332 ) 23 - 28 2009.12

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

Recently musclar strength training is getting popularity in nursing facilities due to its introduced into the care program. In order to carry out such training safely and effectively, we have to customize several training parameters such as the load and the frequency. In an attempt to establish a customization method, we have been studying biometric information-based methods for evaluating muscle fatigue during training. This study analyzed how motion parameters regarding electromyography and movement of the lower extremity changes over time during repetitive squat movement. Experiments employing 10 healthy subjects demonstrated that muscle fatigue primarily affected the maximum angular velocity during flexion and electromyography in the motion phases near the maximum flexion.

Other Link： http://search.jamas.or.jp/link/ui/2010153101

The Effects of Guidance Force of Robot-Driven Gait Orthosis "Lokomat" on Muscle Activation and Joint Kinematics of Lower Extremity during Walking

AOKI Sachiko, KIRYU Tohru, HAYASHI Toyohiko, NAKAZAWA Kimitaka, NAKAJIMA Tsuyoshi, MAEDA Yoshinobu, WATANABE Tetsuya

IEICE technical report 109 ( 332 ) 17 - 22 2009.12

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

In recent years, gait rehabilitation for patients with spinal cord injury has been progressed by introducing advanced robotics. As an equipment for such advanced rehabilitation, robot-driven gait orthosis "Lokomat[○!R]" (Hocoma AG) is available. In order to promote patient's voluntary muscle activity, Lokomat[○!R] has a function of adjusting the driving torque for knee and hip joints required for gait. Parameter regarding this torque adjustment is named the guidance force (GF). This study analyzed the relationship between the GF value and electromyography and motion of the lower extremity under nearly the same kinematic condition, in an attempt to clarify the effects of the GF value on patient's gait. Experiments employing 5 healthy volunteers demonstrated that the decrease of the GF value affected primarily to the local activity in electromyography of the lower extremity without modifying overall activity pattern as well as the ratio of 4 gait phases in kinematics.

Other Link： http://search.jamas.or.jp/link/ui/2010153100

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