Takeshi Hoshino

Japan Aerospace Exploration Agency, Chōfu, Tokyo, Japan

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Publications (22)7.43 Total impact

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    ABSTRACT: This article presents a comprehensive path-planning method for lunar and planetary exploration rovers. In this method, two new elements are introduced as evaluation indices for path planning: 1) determined by the rover design and 2) derived from a target environment. These are defined as the rover's internal and external elements, respectively. In this article, the rover's locomotion mechanism and insolation (i.e., shadow) conditions were considered to be the two elements that ensure the rover's safety and energy, and the influences of these elements on path planning were described. To examine the influence of the locomotion mechanism on path planning, experiments were performed using track and wheel mechanisms, and the motion behaviors were modeled. The planned paths of the tracked and wheeled rovers were then simulated based on their motion behaviors. The influence of the insolation condition was considered through path plan simulations conducted using various lunar latitudes and times. The simulation results showed that the internal element can be used as an evaluation index to plan a safe path that corresponds to the traveling performance of the rover's locomotion mechanism. The path derived for the tracked rover was found to be straighter than that derived for the wheeled rover. The simulation results also showed that path planning using the external element as an additional index enhances the power generated by solar panels under various insolation conditions. This path-planning method was found to have a large impact on the amount of power generated in the morning/evening and at high-latitude regions relative to in the daytime and at low-latitude regions on the moon. These simulation results suggest the effectiveness of the proposed pathplanning method.
    No preview · Article · Mar 2015 · IEEE Robotics & Automation Magazine
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    ABSTRACT: A lunar lander SELENE-2 has been considered. It lands on the Moon's surface and performs in situ scientific observation, environment investigation.
    No preview · Article · Feb 2015
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    ABSTRACT: The Japan Aerospace Exploration Agency (JAXA) views the lunar lander SELENE-2 as the successor to the SELENE mission. In this presentation, the mission objectives of SELENE-2 are shown together with the present design status of the spacecraft. JAXA launched the Kaguya (SELENE) lunar orbiter in September 2007, and the spacecraft observed the Moon and a couple of small satellites using 15 instruments. As the next step in lunar exploration, the lunar lander SELENE-2 is being considered. SELENE-2 will land on the lunar surface and perform in-situ scientific observations, environmental investigations, and research for future lunar utilization including human activity. At the same time, it will demonstrate key technologies for lunar and planetary exploration such as precise and safe landing, surface mobility, and overnight survival. The lander will carry laser altimeters, image sensors, and landing radars for precise and safe landing. Landing legs and a precisely controlled propulsion system will also be developed. A rover is being designed to be able to travel over a wide area and observe featured terrain using scientific instruments. Since some of the instruments require long-term observation on the lunar surface, technology for night survival over more than 2 weeks needs to be considered. The SELENE-2 technologies are expected to be one of the stepping stones towards future Japanese human activities on the moon and to expand the possibilities for deep space science.
    No preview · Article · Nov 2014 · Acta Astronautica
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    ABSTRACT: We report updated status of the SELENE-2 project and some progress of development of technological aspect of the system and instruments on board.
    No preview · Article · Mar 2013
  • T. Hashimoto · T. Hoshino · S. Tanaka · H. Otake · M. Otsuki · K. Ogawa
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    ABSTRACT: JAXA is planning moon exploration missions following Kaguya (SELENE). The first Japanese moon lander is SELENE-2 whose missions include technology demonstrations, scientific observations, investigations for future moon utilization, and social or political purposes. Its phase-A study started in the summer of 2007. SELENE-2 will land on the near side of moon and perform in-situ geological and geophysical observations to improve the knowledge on the origin and the evolution of the moon. Investigations of surface environment are important for future lunar exploration including human activity. It also demonstrates precise landing, hazard avoidance, surface mobility, and night survival technologies. In this paper, recent progress of technology development for SELENE-2 is presented.
    No preview · Article · Jan 2013 · Advances in the Astronautical Sciences
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    ABSTRACT: As a follow-on mission of the lunar orbiter Kaguya (SELENE), a lunar lander SELENE- 2 is planned by the Japan Aerospace Exploration Agency (JAXA). SELENE-2 will land on the lunar surface and perform in situ scientific observations, environmental investigations, and research for future lunar utilization, including human activity. To realize the SELENE- 2 mission, the JAXA Space Exploration Center endeavors to develop advanced technologies that will enable lunar surface activities. For example, a lithium-ion battery with energy density of more than 200 Wh/kg is under development. In addition, durability tests of electrical and mechanical parts in low-temperature environments on the lunar surface have been conducted. Following these fundamental studies, a test model of a 10-W class power source using solar arrays and lithium-ion batteries for the operation of mission instruments at night was designed and fabricated. This paper details our technological developments for long-term stay on the Moon. © 2012 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.
    No preview · Conference Paper · Jul 2012
  • Hitoshi Naito · Takeshi Hoshino · Toshihiro Tani

    No preview · Conference Paper · Jul 2012

  • No preview · Article · Jul 2012
  • T. Hashimoto · T. Hoshino · S. Tanaka · M. Otsuki · H. Otake
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    ABSTRACT: JAXA is planning moon exploration missions following Kaguya (SELENE), whose missions include technology demonstrations, scientific observations, investigations for future moon utilization, and social or political purposes. SELENE-2 is the first Japanese moon lander. Its phase-A study started in the summer of 2007. It will demonstrate precision landing, hazard avoidance, surface mobility, and night survival technologies. In-situ geological and geophysical observations will contribute to improve the knowledge on the origin and the evolution of the moon. Investigations of surface environment and possible in-situ resource will be useful for future human exploration. In this paper, recent progress of research and development for SELENE-2 is presented. Key Words: Lunar exploration. Precision landing. Rover, Night survival.
    No preview · Article · Jan 2012
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    ABSTRACT: JAXA is planning exploration missions to the moon, following upon the Kaguya (SELENE) mission., These missions aim to demonstrate some new technologies, observe the moon scientifically, investigate technical, social and political feasibility of utilizing the moon. For the first step of the missions, the phase A study of SELENE-2 has started from the summer of 2007. This mission will demonstrate the effectiveness of several technologies including precision landing, hazard avoidance, surface mobility, and night survival technologies. In situ geological and geophysical observations will be conducted to improve our knowledge on the origin and the evolution of the moon. Investigating the lunar surface conditions and its potential for in situ resource utilization will provide key information for future human exploration missions. This paper presents the current status of the SELENE-2 mission, its objectives, its design, and other important aspects of its development such as international cooperation.
    No preview · Article · Apr 2011 · Acta Astronautica
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    ABSTRACT: Japanese lunar lander, 'SELENE-II' is being planned as a successor to 'Kaguya'. SELENE-II science mission team has been actively working to maximize the science gain. In this presentation we report the current status of the science instruments and scenario.
    No preview · Article · Mar 2011
  • T. Hashimoto · T. Hoshino · S. Tanaka · M. Otsuki · H. Otake
    [Show abstract] [Hide abstract]
    ABSTRACT: JAXA is planning moon exploration missions following Kaguya (SELENE), whose missions include technology demonstrations, scientific observations, investigations for future moon utilization, and social or political purposes. SELENE-2 is the first Japanese moon lander and its phase-A study started in the summer of 2007. SELENE-2 will demonstrate precision landing, hazard avoidance, surface mobility, and night survival technologies. In-situ geological and geophysical observations will contribute to improve the knowledge on the origin and the evolution of the moon. Investigations of surface environment and possible in-situ resource will be useful for future human exploration. In this paper, recent progress of research and development for SELENE-2 is presented.
    No preview · Article · Jan 2011
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    ABSTRACT: In this paper, a novel structure of a prototype machine is proposed for enhanced start-up characteristics in a bearingless motor. The bearingless motor has two-axis active position regulation with only one unit. Passive magnetic bearings are constructed for improved stiffness in passively regulated movements. The passive magnetic bearings have influence in active two axis movements. A serious situation occurs at a start-up process from touched down condition. An optimization of machine design has been carried out in 3D-FEM analysis and an improved structure is proposed. Based on the design, a prototype bearingless motor is developed. It is shown that a successful start-up is achieved from the touch down displacement of 0.3 mm in experiment.
    No preview · Article · Dec 2008 · IEEE Transactions on Magnetics
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    ABSTRACT: A fuel cell (FC) /regenerative fuel cell (RFC) for space utilization has special system requirements, such as operational conditions and designs, because of its isolated low gravitational and closed environment, which differs greatly from that for terrestrial use. Over 1,000 h continuous and stable operation of PEFC using the developed prototype system was achieved. During conditions of no thermal control, no external humidifier, and low current density operation under low pressure, the voltage was maintained at a constant level under such low temperatures. No cross-leak or flooding phenomena were observed from these results: good performance was also obtained. These results suggest that the polymer electrolyte and other components used in this study were stable in such conditions. Copyright © 2008 by the American Institute of Aeronautics and Astronautics, Inc.
    No preview · Conference Paper · Jul 2008
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    ABSTRACT: In this paper, a magnetically suspended drive is proposed with two-axis active position regulation having one unit of a bearingless motor for possible flywheel applications. For the other unit, a three-axis positioning is supported by passive magnetic bearings. Basic force and stiffness characteristics are investigated by three-dimensional (3-D) magnetic-field analysis.
    No preview · Article · Nov 2005 · IEEE Transactions on Magnetics
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    ABSTRACT: A fundamental study on solar Stirling power generation system has been performed as a part of the space solar power technology program in National Aerospace Laboratory (NAL). The research work involves both a solar receiver and Stirling power generation technologies. The former work is focused on developing a high efficiency solar receiver for future space energy experiments on the Japan Experiment Module-Exposed Facility of the International Space Station. It is composed of a cavity receiver, thermal energy storage and sodium heat pipes, and aims at transporting solar heat to a bottoming system with the minimized heat loss. A ground test model of the solar receiver will be experimentally evaluated in NAL. In parallel, semi-free piston Stirling engine generators have been experimentally studied as one of the candidate converters for future space power generation. Through a series of bench tests, the thermodynamic efficiency of 32% and system efficiency of 20% was obtained. Based on these achievements, the design work for an improved Stirling generator system is underway
    No preview · Conference Paper · Feb 2000
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    ABSTRACT: A fundamental study was performed to develop a high efficiency solar heat receiver system for a solar energy experiment mission on the Japanese Experiment Module (JEM)-Exposed Facility (EF) of the International Space Station (ISS). This system is aimed to transport solar thermal energy to a bottoming system with a high efficiency. It is composed of a solar heat absorber, thermal energy storage (TES) and heat pipes (HPs). Solar light of approximately 1.8 kW is concentrated on a focal plane of the absorber aperture, and then net thermal heat of 1.3 kW is transported to the HP and supplied to a bottoming element such as a Stirling engine alternator, an AMTEC and a furnace for material processing. Uniform heating of HPs were confirmed using a secondary mirror and C/C composite receiver. One ground testing model of the solar receiver was designed and fabricated in 1998, and then experimentally evaluated at a test vacuum chamber of National Aerospace Laboratory. The receiver was heated uniformly and the good heat conduction at the interfaces (receiver-HP, and HP-TES) was confirmed. The periodic sunshine/sunshade mode occurs on the orbit JEM-EF of ISS. The thermal cycle test was performed to demonstrate sunshine/shade modes using the ground testing model. The temperatures of components changed periodically and the heat transfer rates of 100 W at sunshine mode and 75 W at sunshade mode were derived
    No preview · Conference Paper · Feb 2000
  • T Sho · Y Mukose · T Hoshino · T Suzuki · M Oikawa

    No preview · Article · Jun 1973 · Rinsho hoshasen. Clinical radiography
  • S Tarusawa · H Otake · M Watanabe · Y Tamakawa · T Hoshino

    No preview · Article · Jul 1970 · Rinsho hoshasen. Clinical radiography
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    ABSTRACT: Since 1999, we have been developing space debris observation technologies. For this purpose, small optical observation facilities were constructed; 0.35-m Schmidt Cassegrain(SC) telescope on the X-Y mount tracking system for LEO debris observation and 35 cm Newton-type telescope on the equatorial mount for GEO debris observation. High-speed read-out CCD camera with 4K • ~ 4K elements and its cooling system have been developing for the detection of faint objects. Automatic debris detection software has been also developing for the future efficient observation. This paper describes the space debris optical observation facilities a nd detecting technologies developed by Japan Aerospace Exploration Agency (JAXA).
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