ref: http://www.shigerubanarchitects.com/SBA_WORKS/SBA_DRP/SBA_DRP_index.htm
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When the Fukuoka earthquake struck in 2005, ten years had passed since the Hanshin-Awaji earthquake, the last time a seismic intensity was recorded over 6 in a large Japanese city. The main issue in the first phase at evacuation sites is the high density of refugees. Privacy is needed due to the lack of close relationships between neighbors in everyday life. Simple cardboard sheets were offered for insulation and to create a border between families. The cardboard was only used to cover the floor in early crowded times; after the population decreased, the cardboard was used to create partitions for night time privacy.

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http://www.shigerubanarchitects.com/SBA_NEWS/SBA_news_5.htm