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Application of quaternion neural network to EMG-based estimation of forearm motion

2017 International Conference on Artificial Intelligence, ICAI 2017 at 2017 World Congress in Computer Science, Computer engineering and Applied Computing, CSCE 2017

作者： Firdaus, H. Ogawa, T. Mechanical and Electronic Systems Engineering Course Takushoku University Tokyo Japan Department of Electronics and Computer System Takushoku University Tokyo Japan

ISBN: (纸本)9781601324603

This paper presents the Application of Quaternion Neural Network (QNN) to Electromyography (EMG) based Estimation of Forearm Motion. Motion of human body can be modeled as a set of rotations in three-dimensional space by various joints. The aim of this research is to show the efficiency of QNN in estimation from EMG. We are trying to learn, estimate and simulate combined motion using QNN as well as comparing the estimation efficiency with the feedforward neural network (FNN). We are measuring EMG signal of target muscles while performing basic forearm motion. The efficiency of the estimation then determines by simulation with combine motion of forearm. It is expected in better performance of estimation in QNN compare to FNN. CSREA Press ©.

关键词： Efficiency

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Uniaxial stretch-induced axonal injury thresholds for axonal dysfunction and disruption and strain rate effects on thresholds for mouse neuronal stem cells

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Journal of Biomechanical Science and engineering 2017年第1期12卷 16-00598-16-00598页

作者： Kurtoglu, Evrim Nakadate, Hiromichi Kikuta, Kazuhiro Aomura, Shigeru Kakuta, Akira Graduate School of System Design Tokyo Metropolitan University Tokyo Japan Advanced Course of Mechanical and Computer Systems Engineering Tokyo National College of Technology 1220-2 Kunugida-machi Hachioji-shi Tokyo193-0997 Japan

In this paper, the proposed study aims to achieve a better understanding of neuronal tolerance and contribute to the prediction of the secondary degeneration of diffuse axonal injury (DAI). Therefore, a uniaxial stretching device which subjected cultured neurons to uniaxial stretch was employed to evaluate the effect of strain and strain rate along axon to realize the injury threshold. Neurons differentiated from mouse neuronal stem cells were injured and the morphology was observed before and after stretching with strains of 0.10, 0.12, 0.18, 0.23 at strain rates of 8, 11, 19, 26 s-1 respectively. Results suggest that the threshold for axonal dysfunction is around 0.18 strain whereas the threshold for axonal disruption is around 0.23 and the results of strain rate effect investigations on axonal dysfunction and disruption around these threshold values indicated that higher strain rate values such as 50 s-1 may have diminishing effects on threshold for axonal disruption. © 2017 The Japan Society of mechanical Engineers.

关键词： Stem cells

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Determination of Mung Bean Seed Viability Change in Vacuum Packaging during Storage in Different Temperatures

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IOP Conference Series: Materials Science and engineering 2019年第1期557卷

作者： M. Faisal U. Ahmad D. Wulandani Postharvest Technology Master Course Program Graduate School Bogor Agricultural University Indonesia Dept. of Mechanical and Bio-system Engineering IPB Bogor Agricultural University Indonesia

Mung bean seeds decreased their viability very fast during storage, especially in tropical area without proper packaging. The purpose of this study is to observethe decrease in viability of mung bean seeds during storage and to build a mathematical model for shelf life prediction. Dried mung bean seeds were vacuum packed and stored in Accelerated Shelf-life Testing chamber at five different temperatures of 30° C, 35° C, 40° C, 45° C, 50° C with approximately 80% in relative humidity, to facilitate rapid deterioration with different rate of physical and chemical change in the seed. The results show that there was an increase in moisture content and the germination decreased in different rates. Changes in values for some parametersof the seeds affected the viabilty of the seeds during rapid deterioration. The value of constant (k)for viability decreasing was calculated and used to build the mathematical model for predicting the shelf life of mung bean seeds during storage at any temperature. Using the developed model, it was observed that the shelf life of the Sriti variety of mung bean seeds in vacuum packaging could maintain 90% of germination level for 421 days or 14.3 months if stored at 20 °C, and for 173.37 days or 5.78 months if stored at 25 °C.

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Study on break of thermal stratification in container targeted to thermodynamic vent system for future spacecraft

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IOP Conference Series: Materials Science and engineering 2019年第1期502卷

作者： Ryoji Imai Osamu Kawanami Yutaka Umemura Takehiro Himeno Course of Aerospace System Engineering Graduate School of Engineering Muroran Institute of Technology 27-1 Mizumoto-cho Muroran Hokkaido 050-8585 Japan Department of Mechanical Engineering Graduate School of Engineering University of Hyogo 2167 Syosya Himeji 271-2201 Japan Space Technology Directorate Research Unit III Aerospace Research and Development Directorate JAXA 2-1-1 Sengen Tsukuba Ibaraki 305-8505 Japan Department of Aeronautics and Astronautics The University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 169-8555 Japan

In the future space exploration mission, transfer vehicle using cryogenic propellant and oxidizer will be likely operated. Thermal management systems, such as thermal insulation, pressure control, and reduction of boil off gas must be installed on transfer vehicle since cryogenic fluid has high volatile characteristics. Final target of this study is the development of thermodynamic vent system (TVS) utilizing jet mixing. Numerical simulation and ground based experiment for thermal and fluid behaviours in tank partially filled with liquid nitrogen were conducted. Thermal stratification in tank was formed by creating heat input from side wall, and change of temperature field and break of thermal stratification by jet mixing were investigated. Numerical results were evaluated by comparing with experimental results.

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A digital hand to mimic human hand in real time operation: Making of digital finger with partial soft skin and rigid bone 11

A digital hand to mimic human hand in real time operation: M...

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11th International Conference on Computer Graphics Theory and Application, GRAPP 2016;Part of the 11th Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications, VISIGRAPP 2016

作者： Hashimoto, Hiroshi Yokota, Sho Chugo, Daisuke Mitsuhashi, Kaoru Industrial Technology Graduate Course Advanced Institute of Industrial Technology Tokyo Japan Department of Mechanical Engineering Toyo University Saitama Japan Department of Human System Interaction Kwansei Gakuin University Hyogo Japan Department of Mechanical Engineering Tokyo University of Technology Tokyo Japan

ISBN: (纸本)9789897581755

This paper presents a digital hand which is a type of model to mimic human hand operation in real time operation. Human hand performs various difficult tasks in daily life and shows dexterous operation to use tools or equipment, because it has numerous degree of freedom (DoFs) of finger joints and soft skin. To realize the mimic of human hand operation in real time operation to overcome the problems such as high DoFs, soft skin. We have developed the digital hand whose input to control hand posture is obtained from a hand posture sensor and soft skin is designed as mesh structure. Here, the way to define parameters of mesh structure is discussed. We demonstrate the simulation of the digital hand model and examine how the model is able to mimic the motion of human hand. © Copyright 2016 by SCITEPRESS - Science and Technology Publications, Lda. All rights reserved.

关键词： Degrees of freedom (mechanics)

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Overview of Research of Rollovers

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Journal of Traffic and Transportation engineering 2015年第1期3卷 1-6页

作者： Toshiaki Sakurai Mechanical Engineering and System Course Iwaki Meisei University Fukushima 970-8551 Japan

This paper describes the research of rollovers of passenger cars and proposes a ramp type test as a typical dynamic rollover test with evaluations of occupant injuries and vehicle deformation in accordance with various parametric functions. Many types of rollover tests have been conducted in the past and they have their merits and demerits. However, the ramp rollover test has a characteristic to evaluate both dummy injuries and vehicle deformations, and to perform tests under many conditions by exchanging ramp dimensions, steer timings made rotation and velocity of the vehicle.

关键词： Rollover roof crush dynamic ramp rollover test FMVSS 216 crashworthiness movement of passengers

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Development of VAS app to improve youth mental health research environment

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ICIC Express Letters, Part B: Applications 2016年第9期7卷 1939-1944页

作者： Shirahama, Naruki Watanabe, Satoshi Ikegami, Fumiko Mori, Yukio Department of Creative Engineering Information and System Engineering Course National Institute of Technology Kitakyushu College 5-20-1 Shii Kokuraminami-ku Kitakyushu-shiFukuoka802-0985 Japan School of Health Sciences at Odawara International University of Health and Welfare 1-2-25 Shiroyama Odawara-shiKanagawa250-8588 Japan School of Information Studies Shizuoka Sangyo University 4-1-1 Sugawara-dai Fujieda-shiShizuoka426-8668 Japan Department of Mechanical and Electronic Engineering Salesian Polytechnic 4-6-8 Oyamagaoka Machida-shiTokyo194-0215 Japan

The importance of mental health care for youth has increased year by year. UPI, which is one of the screening test methods, has been carried out in many educational institutions in order to discover the students who have mental health problems at an early stage. However, some problems such as difficulty of expressing psychological agreement are pointed out. UPI test is two selections format, and it is sometimes difficult to express the subtle ratio of psychological agreement depending on respondents and questions. Therefore, there is a possibility that some students do not answer correctly. Accordingly, we propose to introduce Visual Analog Scale (VAS), that is easy to express psychological agreement as a continuous scale in questionnaire. However, VAS has difficulty of tabulation. To solve these problems, we have developed a VAS app called “VASpad”. In order to verify the validity of VASpad, we conducted an experiment for comparison with traditional VAS. We performed subjective evaluation experiments using VASpad and traditional VAS for the 40 subjects. The results show that there is a high correlation coefficient between both VASs, and show the possibility that VASpad can be used as well as traditional VAS. We also describe the future subjects in this paper. © 2016 ICIC International.

关键词： Problem solving

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An in vitro stretch-injury model for elongation-controlled neuronal cells: Effect of strains along neurite 15

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15th International Conference on Biomedical engineering, ICBME 2013

作者： Nakadate, H. Aomura, S. Kakuta, A. Graduate School of System Design Tokyo Metropolitan University Tokyo Japan Advanced Course of Mechanical and Computer Systems Engineering Tokyo National College of Technology Tokyo Japan

ISBN: (纸本)9783319029122

Diffuse axonal injury (DAI), a major component of traumatic brain injury, is associated with rapid deformation of brain tissue resulting in the stretching of neural axons. Focal axonal beading, which is the morphological hallmarks of DAI pathology, leads to the disconnection of neurons from tissues, resulting in cell death. Our goal is better understanding of neuronal tolerance and help to predicting the pathogenesis of DAI from mechanical loading to the head. In present study, we developed a stretch-injury model that subjected cultured neuronal cells in which the directions of neurite elongation were controlled with microfluidic culture technique to uniaxial stretch and examined the effect of strains along neurite on the cell damage. Neurites from PC 12 cells were extended at 0, 45 and 90 degrees to stretch direction using a fabricated poly(dimethylsiloxane) (PDMS) piece having microgrooves in combination with PDMS substrate. Following stretch with a strain of 0.22 and a strain rate of 27 s-1, the morphology of same neurites were observed at 5 min–24 h. As a result, the beading along neurites oriented at 0 degree increased immediately following stretch and the increase was sustained until 24 h, although the beading along neurites oriented at 45 and 90 degrees transiently increased within 1 h following stretch. Many rupture of neurites was observed more in neurites oriented at 0 and 90 degrees than in neurites oriented at 45 degrees, however, the retraction and disappearance of neurites did not differ in any orientation conditions. These results suggest that the difference in strain along neurite induces different types and degrees of neurite damage and not strain of cellcultured substrate but strain loaded to neurite is important to evaluation of neuronal injury. © Springer International Publishing Switzerland 2014.

关键词： Microfluidics

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In vitro uniaxial stretch model for evaluating the effect of strain along axon on damage to neurons

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Journal of Biomechanical Science and engineering 2014年第3期9卷 1-10页

作者： Nakadate, Hiromichi Fukumura, Yohei Kaneko, Yuma Kakuta, Akira Furukawa, Hidenori Aomura, Shigeru Graduate School of System Design Tokyo Metropolitan University 6-6 Asahigaoka Hino Tokyo191-0065 Japan Advanced Course of Mechanical and Computer Systems Engineering Tokyo National College of Technology 1220-2 Kunugida-machi Hachioji-shi Tokyo193-0997 Japan

Diffuse axonal injury (DAI), a major component of traumatic brain injury, is associated with rapid deformation of brain tissue resulting in the stretching of neuronal axons. Focal axonal beading, which is the morphological hallmark of DAI pathology, leads to the disconnection of neurons from tissues and results in cell death. Our goal is to achieve a better understanding of neuronal tolerance and help predict the pathogenesis of DAI from mechanical loading to the head. In the present study, we developed an experimental model that subjected cultured neurons to uniaxial stretch by controlling the direction of axonal elongation with a microfluidic culture technique and examined the effect of strains along the axon on cell damage. Neurites from PC 12 cells that differentiate into neurons with structurally axon-like cylindrical protrusions by nerve growth factor were extended at 0°, 45°, and 90° relative to the tensile direction by using a fabricated polydimethylsiloxane (PDMS) piece with microgrooves in combination with a PDMS substrate. The morphology of the same neurites was observed before and after stretching with a strain of 0.22 at a strain rate of 27 s-1. As a result, swellings along neurites oriented at 0° increased immediately following stretching and were sustained for 24 h. In contrast, swellings along neurites oriented at 45° and 90° transiently increased within 1 h following stretching. Although more ruptures were observed in neurites oriented at 0° and 90° than in those oriented at 45°, the number of neurites and cells did not differ among orientation conditions. These results suggest that the difference in strain along the axon induces axonal injuries differing in type and degree. They also suggest that the strain on the axon, rather than that on the cell-cultured substrate, is important for evaluating neuronal damage. © 2014 The Japan Society of mechanical Engineers.

关键词： Strain rate

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Computer simulations and experiments on vibration control of a flexible link manipulator using a piezoelectric actuator

Computer simulations and experiments on vibration control of...

引用

International MultiConference of Engineers and Computer Scientists, IMECS 2014

作者： Muhammad, Abdul Kadir Khan, Barlas Raheel Okamoto, Shingo Lee, Jae Hoon Center for Mechatronics and Control System Mechanical Engineering Department State Polytechnic of Ujung Pandang Jl. Perintis Kemerdekaan KM 10 Makassar90-245 Indonesia Mechanical Engineering Course Graduate School of Science and Engineering Ehime University 3 Bunkyo-cho Matsuyama790-8577 Japan

ISBN: (纸本)9789881925251

The purposes of this research are to formulate the equation of motion of the system, to develop computational codes by a finite-element method in order to perform dynamics simulation with vibration control, to propose an effective control scheme and to confirm the calculated results by experiments of a flexible link manipulator. The system used in this paper consists of an aluminum beam as a flexible link, a clamp-part, a servo motor to rotate the link and a piezoelectric actuator to control vibration. Computational codes on time history responses, FFT (Fast Fourier Transform) processing and eigenvalues -eigenvectors analysis were developed to calculate the dynamic behavior of the link. Furthermore, a control scheme using the piezoelectric actuator was designed to suppress the vibration. A proportional controller was designed and demonstrated its performances. The system and the proposed control scheme were confirmed through experiments. The calculated and experimental results revealed that the vibration of the flexible link manipulator can be controlled effectively.

关键词： Piezoelectric actuators

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