Fast and space-efficient secure frequent pattern mining by FHE. - Hiroki Imabayashi; Yu Ishimaki; Akira Umayabara; Hayato Yamana (IEEE BigData, 2016)

Secure Frequent Pattern Mining by Fully Homomorphic Encryption with Ciphertext Packing. - Hiroki Imabayashi; Yu Ishimaki; Akira Umayabara; Hiroki Sato; Hayato Yamana (DPM/QASA@ESORICS, 2016)

MCMalloc: A scalable memory allocator for multithreaded applications on a many-core shared-memory machine. - Akira Umayabara; Hayato Yamana (IEEE BigData, 2017)