Search Results 1-20 of 98

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  • Exploration of Seafloor Massive Sulfide deposits using natural gamma-ray logging: An application of through-the-bit logging  [in Japanese]

    Kitada Kazuya , Sanada Yoshinori , Yamada Yasuhiro , Nozaki Tatsuo , Kumagai Hidenori , Maruta Masahiro , Sato Hiroshi

    … 330 and 670 m N-NNW from the hydrothermal sulfide mound, subseafloor strata were dominated by pumice with minor amounts of hemi-pelagic sediment and the gamma-ray intensity correlated well with the density and porosity of the core samples determined by the multi-sensor core logger (MSCL) and discrete sample measurements. … The versatility of this system could be further improved with additional sensor measurements (e.g., resistivity) in future drilling operations at seafloor hydrothermal fields.</p> …

    BUTSURI-TANSA(Geophysical Exploration) 73(0), 33-41, 2020

    J-STAGE 

  • Numerical Analysis of Droplet Scattering from Rotor of Steam Turbine  [in Japanese]

    ENAMI Yoshiaki , SEINO Junichi

    … <p>The phenomena of droplets colliding and scattering on the blades of the steam turbine were calculated using the general-purpose thermal fluid analysis software STAR-CCM+ by Lagrangian multiphase and liquid film model. … The simulation results were verified by an experiment in which water was sprayed on the blade rotated at the rated speed and a pressure distribution sensor collects the impact of colliding droplets detached from the blade. …

    The Proceedings of The Computational Mechanics Conference 2019.32(0), 019, 2019

    J-STAGE 

  • Development of continuum leg robot that imitated brittle stars:- Development of continuum leg that performs twisting motion and elliptic ball joint -  [in Japanese]

    KOBAYASHI Rui , AOKI Takeshi

    … <p>In order to move on uneven ground, control with sensor such as a force sensor is necessary. … The continuum legs passively change the shape and improve the ground adaptability without using the sensor. … Moreover, the development of the continuum legs referred to brittle star. … Brittle star is a moving creature that uses thin, long and flexible legs. …

    The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2019(0), 1P2-G05, 2019

    J-STAGE 

  • Star Identification Algorithm Based on Oriented Singular Value Feature and Reliability Evaluation Method

    WEI Xin , WEN Desheng , SONG Zongxi , XI Jiangbo

    … <p>A full-sky autonomous star identification algorithm aimed at solving the "lost-in-space" problem is presented in this paper. … initial match results, an evaluation method is applied to estimate the reliability of candidates from the star voting results, acquiring the final unique matching of stars in the image. … Experiments show that our algorithm is more robust to star position noise and magnitude noise than the two conventional algorithms. …

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 62(5), 265-274, 2019

    J-STAGE 

  • Studies of the Optical and Sensing Properties of 1,3,5-Triazine-Cored Star-Shaped (D-π)<sub>3</sub>-A Molecules with Various Amino-Donor-Type Cation Receptors

    Muraoka Hiroki , Sasaki Hikaru , Ogawa Satoshi

    … <p>We newly designed and synthesized two kinds of 1,3,5-triazine-cored star-shaped (D-π)<sub>3</sub>-A molecules with 1-aza 15-crown 5-ether receptors (<b>TSM-ACE</b>) and dipicolylamino receptors (<b>TSM-DPA</b>), which possess an intramolecular charge transfer (ICT) nature and exhibit ICT-based optical properties (ICT transition absorption and fluorescence from a ICT excited state). …

    Bulletin of the Chemical Society of Japan 92(4), 797-806, 2019

    J-STAGE 

  • Relative Attitude Detection Using Characteristic Points Position Estimation  [in Japanese]

    KIKUYA Yuhei , MATUNAGA Saburo

    … Attitude determination using earth sensors has an advantage of smaller volume compared with star trackers. … By estimating the position of unknown objects using geometrical analysis, it is possible to predict the direction to the object from the earth sensor frame, at the time after a certain period. …

    The Proceedings of the Space Engineering Conference 2018.28(0), 1A4, 2018

    J-STAGE 

  • Development and Ground Evaluation of Fast Tracking Algorithm for Star Trackers

    SATO Yuji , KUWAHARA Toshinori , FUJITA Shinya , SAKAMOTO Yuji , YOSHIDA Kazuya

    … <p>Fast tracking algorithm discussed in this paper is applied to star trackers for improving the performance of star identification. … Space Robotics Laboratory (SRL) in Tohoku University has developed star trackers for micro-satellites so far. … Since it has only a lost-in-space algorithm for star identification, the attitude update rate is limited up to 1 Hz. …

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN 16(3), 202-209, 2018

    J-STAGE 

  • Development of the Arcsecond Pico Star Tracker (APST)

    MURUGANANDAN Vishnu Anand , PARK Ji Hyun , LEE Sangyoon , JEUNG In-Seuck , KIM Sangkyun , JU Gwanghyeok

    … The second-generation star tracker estimates pointing knowledge of a satellite without a-priori knowledge. … But star trackers are larger in size, heavier, power hungry and expensive for nanosatellite missions. … The Arcsecond Pico Star Tracker (APST) is designed based on the limitations of nanosatellites and estimated to provide pointing knowledge in an arcsecond. …

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 60(6), 355-365, 2017

    J-STAGE 

  • Demonstration of innovative attitude sensors utilizing Deep Learning  [in Japanese]

    谷津 陽一 , 吉井 健敏 , 村木 雄太郎 , 針田 聖平 , 太田 佳 , 松下 将典 , 松永 三郎 , 下川辺 隆史

    宇宙科学技術連合講演会講演集 60, 6p, 2016-09-06

  • Improvement of Star Sensor in Generic Test Environment

    SUGIMURA Nobuo , HASHIMOTO Tatsuaki , KUWAHARA Toshinori , SAKAMOTO Yuji , YOSHIDA Kazuya , SATO Yuki , TAKANO Tomohiro

    … <p>A new star sensor for a microsatellite was developed for accurate and reliable attitude detection. … Microsatellite RISING-2, which was launched on May 24, 2014, has raised some issues with regard to the functionality of its star sensor. … The soundness of the star sensor is indicated via attitude detection tests against several star patterns using real flight images taken by RISING-2. …

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN 14(ists30), Pf_97-Pf_103, 2016

    J-STAGE 

  • Commonalizing of Frequency Channel for Spectrum Sharing in Wireless Sensor Networks with Star Topology  [in Japanese]

    KIMURA Takumi , TAKYU Osamu , OHTA Mai , FUJII Takeo , SASAMORI Fumihito , HANDA Shiro

    多数のセンサから情報を収集する無線センサネットワークは,情報集約局を中心としたスター型ネットワークとなる.また,高い拡張性を得るため各センサは自律分散的に動作する.その結果,各センサがアクセスする周波数チャネルが異なるため,選択チャネルを共通にする手法が求められる.また,既存システムと無線センサネットワークが周波数共用する際,既存システムから干渉を受ける可能性があり,干渉耐性のあるチャネル共通化手 …

    The Journal of The Institute of Image Information and Television Engineers 70(2), J69-J73, 2016

    J-STAGE 

  • Enhancing Throughput of Star Topology Sensor Network by Group Acknowledgement Method and MCR SS-CSMA/CA

    Masaki TAKAMORI , Yasushi YAMAO

    IEICE Proceeding Series (28), 343-347, 2015

    DOI 

  • Design and testing of a miniaturized three-axis angle sensor for stage motion measurement  [in Japanese]

    Maruyama Taiji , Shimizu Yuki , Ito So , Gao Wei , Siew Leng Tan

    次世代超精密ステージにおけるサブnm級位置決め実現のため,ステージ微小姿勢角の高速検出・フィードバック制御技術の確立が求められている.筆者らは2次元回折格子を用いてシングルレーザ光で3軸姿勢を一括検出する,光学式3軸角度センサを開発している.本報では,リニアエンコーダの光学式センサヘッドと同等サイズのコンパクトな3軸角度センサヘッド光学系を設計・試作し,その基礎特性を検討した結果を報告する.

    Proceedings of JSPE Semestrial Meeting 2015S(0), 151-152, 2015

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  • Energy-Efficient Sensor Device Personalization Scheme for the Internet of Things and Wireless Sensor Networks

    LEE ByungBog , KIM Se-Jin

    … In this paper, we propose a novel energy-efficient sensor device management scheme called <i>sensor device personalization</i> … (SDP) for the Internet of things (IoT) and wireless sensor networks (WSNs) based on the IEEE 802.15.4 unslotted carrier sense multiple access with collision avoidance (CSMA/CA). …

    IEICE Transactions on Communications E98.B(1), 231-241, 2015

    J-STAGE 

  • Development of Autonomous Star Tracker NSTT (Next-Generation Star Tracker)  [in Japanese]

    松本 秀一 , 川井 洋志 , 岩田 隆敬 [他]

    宇宙科学技術連合講演会講演集 58, 6p, 2014-11-12

  • High Anti-interference Performance of 802.15.4k DSSS Systems to coexist with Others in 920 MHz band  [in Japanese]

    TADA Yasutaka , KATO Shuzo

    … This paper clarifies 802.15.4k DSSS (direct sequence spread spectrum) systems are suitable for wide area sensor networks with star topology. …

    IEICE technical report. SRW, Short range wireless communications 114(84), 35-39, 2014-06-16

  • Closed Loop Timing Synchronization for Start Topology Composed of Many Nodes  [in Japanese]

    TAKYU Osamu , FUJII Takeo , OHTA Mai

    … Wireless sensor network (WSN) constructs the star topology type of network where many nodes are accessing to one fusion center (FC). …

    IEICE technical report 113(457), 151-156, 2014-03-03

  • From the 8m Subaru Telescope to a thirty meter telescope:principles and development of adaptive optics  [in Japanese]

    IYE Masanori

    … The NAOJ further developed Laser Guide Star Adaptive Optics to cancel, in real time, atmospheric disturbances to achieve diffraction limited imaging, which is 10 times sharper than the natural imaging. …

    Oyo Buturi 83(12), 976-985, 2014

    J-STAGE 

  • An ultra-high sensitive optical angle sensor:Influence of lens aberration due to the expansion of laser beam diameter  [in Japanese]

    Murata Dai , Tan Siew Leng , Shimizu Yuki , Ito So , Gao Wei

    超精密ステージ等の微小姿勢角計測に用いられる光学式角度センサの高感度化が求められている.筆者らはシングルセル受光素子を用いた高感度レーザ角度センサを開発してきた.測定レーザビーム径を拡大すると受光素子上での集光スポットが小径化し更なる高感度化が望める一方で,対物レンズの収差による影響が無視できなくなる.本報では,対物レンズの収差がセンサ感度に及ぼす影響を理論的・実験的に検討した結果を報告する.

    Proceedings of JSPE Semestrial Meeting 2014S(0), 77-78, 2014

    J-STAGE 

  • Simultaneous Multi-channel Receiver for Sensor Network Systems with Star Topology

    Okada Hironao , Masuda Takashi , Itoh Toshihiro

    … thus, the power consumption of a wireless sensor node during transmission can be reduced. … Because a wireless sensor node cannot have much power, solving the problem by improving the receiver and not using power in the node is desirable, such as employing a carrier-sense operation. …

    IEEJ Transactions on Sensors and Micromachines 134(3), 72-73, 2014

    J-STAGE 

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