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  • Y Murayama
  • 1990
Changes in the spatial distribution of internal migration in Japan are analyzed over the period 1954-1987 using official data. The results show that migration closely follows the economy. Internal migration increased rapidly during the 1950s and 1960s, peaked in 1971, declined until 1985, and has shown slight increases in 1986 and 1987. Spatial patterns(More)
Japan is planning to send a rover to the moon to investigate the moon surface in the near future. Therefore, considerable researches and developments about the subject are being done. We particularly have continued to propose expandable three-wheeled rovers, and to develop them. This paper proposes the new concept of the three-wheeled rover “Tri-Star(More)
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