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2024 International Symposium on Antennas and Propagation, ISAP 2024

作者： Yamamoto, Tsunayuki Kobashi, Takeo Maruyama, Tamami Department of Integrated Science and Technology National Institute of Technology Tsuyama College Tsuyama-shi Japan Advanced Electronics and Information System Engineering Course National Institute of Technology Tsuyama College Tsuyama-shi Japan Department of Production Systems Engineering Institute of Technology Hakodate College Hakodate-shi Japan

ISBN: (纸本)9798350364774

In this paper, two technologies of metamaterial for microwave wireless power transfer are shown. One is a zeroth-order resonance for a microwave snow melting system, and another one is a focusing reflector for realizing of a highly efficient wireless power transfer space. A zeroth-order resonance leads a uniformed microwave heating and a flexibility of feeding in a snow melting system. Focusing reflector can make some electromagnetic hot and null points in a space. These are expected to be required technologies for highly efficient wireless power transfer. © 2024 IEEE.

关键词： Reflection

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Basic Study for Transfer Learning for Autonomous Driving in Car Race of Model Car 6

Basic Study for Transfer Learning for Autonomous Driving in ...

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6th International Conference on Business and Industrial Research, ICBIR 2021

作者： Chiba, Shohei Sasaoka, Hisayuki National Institute of Technology Asahikawa College Advanced Course of Production System Engineering Asahikawa Japan National Institute of Technology Asahikawa College Dep. of Electrical and Computer Engineering Asahikawa Japan

ISBN: (纸本)9781665433495

Reinforcement learning, deep learning, and deep reinforcement learning can effectively acquire action rules for the autonomous motion of objects. However, some researchers have reported that the machine learning process requires a large amount of learning time. Besides, the process needs to consider the similarity of the environment between the training target and the test target. There is no such thing as driving only on a course learned in advance in actual autonomous driving. In this study, we have used a transfer learning algorithm for autonomous drivings for model cars. The training target for acquiring the learning model and the actual driving courses are changed. In this study, we report on the effectiveness of transfer learning using a model car as the basis for a learning model acquired by reinforcement learning. © 2021 IEEE.

关键词： Deep learning

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Research on Metamaterial Technology for Microwave Wireless Power Transfer

Research on Metamaterial Technology for Microwave Wireless P...

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International Symposium on Antennas and Propagation (ISAP)

作者： Tsunayuki Yamamoto Takeo Kobashi Tamami Maruyama Department of Integrated Science and Technology National Institute of Technology Tsuyama College Tsuyama-shi Japan Advanced Electronics and Information System Engineering Course National Institute of Technology Tsuyama College Tsuyama-shi Japan Department of Production Systems Engineering Institute of Technology Hakodate College Hakodate-shi Japan

ISBN: (数字)9798350364774

ISBN: (纸本)9798350364781

关键词： Microwave antennas Microwave technology Electromagnetic heating Snow Focusing Wireless power transfer Resonance Metamaterials Electromagnetics Microwave propagation

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3D Map Generation for Decommissioning Work

3D Map Generation for Decommissioning Work

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International Conference on Intelligent Autonomous systems (ICoIAS)

作者： Ryoma Hanabusa Yasuto Nagase Satoshi Mitsui Toshifumi Satake Naoki Igo Advanced Course of Production System Engineering National Institute of Technology Asahikawa College Asahikawa Japan Control and Information Engineering National Institute of Technology Asahikawa College Asahikawa Japan

ISBN: (数字)9781728160788

ISBN: (纸本)9781728160795

At the Fukushima Daiichi Nuclear Power Station (NPS), robots are used to propel the decommissioning work. Creating a 3D map of the internal environment of the decommissioning work is a necessary technology for improving the working efficiency of a decommissioning robot. The purpose of this research is to realize a 3D map creating a system using a camera by operating the humanoid general-purpose robot Pepper using the Robot Operating system (ROS) and implementing and executing Visual SLAM. The system aims to be applied to a decommissioning robot in the future. In this study, we implemented Visual SLAM methods R-tab Map, which is a method for constructing 3D maps in real-time, and Large-Scale Direct SLAM, which is method that generates a map using luminance with a large gradient between frames without using features for map generation. We also compared and evaluated the effectiveness of the generated maps. Besides, the robot was manually operated using nao_teleop, which can operate Pepper from the ROS library with the PS3 controller, the visualization software rviz, and the point cloud visualization library PointCloudViewer. Using two Visual SLAM's methods, we implemented the experiment. During the experiment, a chair was placed in front of Pepper as an obstacle. In this environment, Pepper was rotated 360 [deg] by manual operation. However, nao_teleop and Visual SLAM methods caused a conflict between the manual operation of Pepper and the 3D map generation process, and both processes stopped. Therefore, the 3D map wasn't generated. To resolve the conflict with operation, Pepper was moved by human and the experiment was again. As a result, the camera image obtained from Pepper was distorted, the map could not be optimized. Therefore, the part of 3D map was only generated. For this reason, to realize a 3D map generation system, it was important to properly calibrate the camera that could acquire a flat image without distortion.

关键词： Three-dimensional displays Cameras Libraries Robot vision systems

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Deformation in axial compression of aluminum tubular structures with ribs

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Keikinzoku/Journal of Japan Institute of Light Metals 2019年第8期69卷 379-386页

作者： Yokoya, Keisuke Miyazaki, Makoto Tojo, Yusuke Yamashita, Minoru Institute of Technology Nagano College Advanced Course of Production and Environment System National 716 Tokuma Nagano-shi Nagano381-8550 Japan Department of Mechanical Engineering Tokyo Institute of Technology [2-12-1 Ookayama School of Engineering Meguro-ku Tokyo152-8552 Japan Department of Mechanical Engineering National Institute of Technology Nagano Japan DENSO Aircool Corporation Japan Department of Mechanical Engineering Gifu University Japan

Dynamic compression behavior of various kinds of polygonal tubular structures with ribs are investigated. Square hollow structures and that with rib reinforcement of aluminum extrusions are in dynamic axial compression, using a drop hammer. Numerical simulation was also conducted for the wider variety of cross-sectional shapes and reinforcements. The effect of the axial length, cross-sectional shape and reinforcing rib arrangement on the deformation behavior were investigated. Comparable compressive force was obtained when the cross-sectional area of the structure is similar, even if the number of edges in cross-section increases from four (square) to eight. Rib reinforcement is very effective for the improvement of the crush or energy absorbing performance. Deformation behavior was successfully predicted by the numerical simulation. Numerical simulation of the compression of the various polygonal tubular structures with radial ribs was also carried out. The number of radial ribs in cross-section of the polygonal hollow structure has a positive relationship to the deformation constraint at corners and the torsional rigidity, consequently, the crush resistance increased. © 2019 The Japan Institute of Light Metals.

关键词： Reinforcement

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Fatigue characteristic showing ultra-high fatigue ratio in Zr-based bulk metallic glasses with less impurities and less defects

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Zairyo/Journal of the Society of Materials Science, Japan 2019年第3期68卷 212-217页

作者： Fujita, Kazutaka Misumi, Kousuke Togashi, Nozomu Shimizu, Yukiharu Yokoyama, Yoshihiko Ube College Tokiwadai Ube755-8555. Japan Advanced Course of Production System Engineering Alumni N IT Ube College Tokiwadai Ube755-8555 Japan BMG Development Dept. Adamant Namiki Precision Jewel Co. Ltd Shimomenaisawa Kuroishi036-0539 Japan Institute for Materials Research Tohoku University Katahira Sendai980-8577 Japan

The fatigue ratio [fatigue limit (?W) / tensile strength (?B)] of bulk metallic glass (BMG) was initially smaller by an order of magnitude than that of the crystalline structural alloys of 0.3 to 0.6. Then, the BMG was regarded as useless for structural members. However, the ?W/?B of BMGs increased with increasing the year, and recently a large value of about 0.8 was shown for a Ti-based BMG, and the maximum cyclic stress (?max) was about 90% of the ?B. Since BMG has no dislocation, it may not show fatigue. Therefore, in this report, using high-purity elements, the Zr-based BMG with less impurities and less defects was made by arc-melt Cu mold tilt casting method, which is expected to have less impurities or defects, and fatigue strength of the BMG was examined by also paying attention to the polishing of the specimen surface. As a result, higher value of the ?W/?B about 0.8 ~ 0.9, and the ?max/?B of about 0.9 ~ 1.0 were shown. In addition, the influence of increase in number of casting times with same master BMG, which raises the yield rate of the master BMG, on the ?B and ?W and the influence of the specimen surface polishing level on the ?W are reported. © 2019 Society of Materials Science Japan. All rights reserved.

关键词： Fatigue of materials

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Nondestructive evaluation of ductile cast iron matrix via casting surface by electromagnetic method 73

Nondestructive evaluation of ductile cast iron matrix via ca...

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73rd World Foundry Congress: Creative Foundry, WFC 2018

作者： Horikawa, Noritaka Wang, Lin Tani, Kazuma National Institute of Technology Asahikawa College 1-62-2 Shunkodai Asahikawa072-8142 Japan Hitachi Metals Ltd. Casting Technology Research Laboratory 11 Kinugaoka Moka321-4367 Japan National Institute of Technology Asahikawa College Advanced Course of Production System Engineering Japan

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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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Effect of surface condition on eddy current evaluation of ductile cast iron matrix 72

Effect of surface condition on eddy current evaluation of du...

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72nd World Foundry Congress, WFC 2016

作者： Horikawa, Noritaka Honma, Takato National Institute of Technology Asahikawa College 1-62-2 Shunkoudai Asahikawa072-8142 Japan Advanced Course of Production System Engineering National Institute of Technology Asahikawa College Japan

ISBN: (纸本)9781510833128

This study examined the effect of the surface conditions on evaluating ductile cast iron matrix with the eddy current method. Specimens having matrix with various pearlite ratio were prepared. The surfaces of the specimens are machined by face mill and shaping machine with various cutting conditions. Surface roughness of the test piece was measured. Eddy current testing was carried out with an eddy current flaw tester. Cutting condition affects the eddy current signals especially when a worn cutting chip was used. Difference of matrix can be evaluated by using eddy current signals, but the surface machining has unignorable effect. © 2016, The WFO (The World Foundry Organization Ltd). All rights reserved.

关键词： Eddy current testing

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Element-Level Clustering of Feature Vectors Considering Correlations for Analyzing Image Data

Element-Level Clustering of Feature Vectors Considering Corr...

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International Conference on Semantics, Knowledge and Grid (SKG)

作者： Masako Omachi Shinichiro Omachi Advanced Course of Production System and Design Engineering Sendai National Collage of Technology Natori Japan Graduate School of Engineering Tohoku University Sendai Japan

ISBN: (纸本)9781509047963

Clustering is a fundamental tool for data analysis. Typically, all attributes of the data are used for clustering. However, if a set of attributes can be divided into meaningful subsets, it may be effective to cluster the data for each subset. In this paper, we propose a method for dividing the set of elements of feature vectors into meaningful subsets. Considering the dependencies between the elements, the correlation is used as the metric for clustering. In order to effectively solve the optimization problem, a technique for graph cut is used. After dividing the set of elements into subsets, clustering is performed for each subset. Experiments using a handwritten image database show the effectiveness of the proposed method.

关键词： Correlation Measurement Optimization Pattern recognition Probability Databases Clustering algorithms

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