We have developed a 50kg class microsatellite "

We have developed a 50kg class microsatellite "

This paper describes our work building and testing a concept to share information among operators of manned aircraft and small unmanned aerial systems (sUASs) using the same low-altitude airspace to reduce collision risk, which is an urgent issue due to the rapid growth of sUASs use in many countries. Our concept is to share the positions of manned aircraft and sUASs on a web-based UAS Traffic Management (UTM) platform and provide alerts that give the operators of sUAS sufficient time to land the sUASs before a manned aircraft reaches the designated minimum airspace distance necessary for separation from the sUASs. The purpose of this paper and the flight demonstrations is to investigate the feasibility and problems in building such a platform. This paper also reports on the latest sUAS situations, including regulatory discussions, operations, the experimental environment, and the required regulatory arrangements.

東京工業大学では松永研究室を主体として40kg級超小型衛星ひばりの開発を行っている．ひばりは太陽電池パドルを回転駆動することで衛星の姿勢制御をする「可変形状姿勢制御」の実証をミッションとする^{1, 2, 3)}．これは革新的なアクチュエータの実証としてJAXAが主導する「革新的衛星技術実証プログラム２」に採択され，2021年度内にイプシロンロケットによって打ち上げ予定である^{4, 5)}．ひばりの通信系では，S帯によるノミナル通信の他に，サブミッションとしてGlobalstar衛星コンステレーションを用いた速報通信を行う．図1に衛星外観を，図2に通信系システムダイアグラムを示す．本講演では，これらの通信システムの概要と開発状況を述べる．

From the time a disaster strikes to the time of restoration and recovery, community FM broadcasting can be an important information source at the time of the disaster and for the restoration efforts in the affected region. While the value of community radio for information transmission during a disaster has been welldocumented, most previous research has not considered its role in the memory of disaster. This study shows that community FM broadcasting in disaster-stricken areas can play a supportive role in the making of a collective memory of the disaster, which can be important for future disaster resilience. In-depth interviews were conducted with staff members from 11 community FM radio stations in areas that suffered severe damages by the Great East Japan Earthquake. The study also analyzed regular programs related to the disaster and special programs on the Memorial Day of 3. 11 aired by 27 community FM stations in the region in 2018 and 2019. This study illustrates how FM broadcasting can create a ritual space for the intergenerational transmission of memories and, in this case, the re-imagining of a collective identity of “Us, the disaster-survivors’ community.”