Hyuma Watanabe

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Digital watermarking techniques have been used for preventing an illegal copying and re-distributing of contents. A collusion attack is a strong attack against digital watermarking schemes. To prevent such attacks, a collusion secure fingerprint code can be used. Collusion secure fingerprint code have been studied widely and many codes have been proposed.(More)
Heart disease has the second high mortality rate behind cancer in Japan, and requires quick treatment. To take a part in emerging mHealth, we developed a wearable heart disease monitoring and alerting system “Dentan”. Dentan continuously monitors patient's ECG in his/her daily activities and issues an alert to the patient as well as(More)
Heart disease has the second high mortality rate behind cancer in Japan, and requires quick treatment. To take a part in emerging mHealth, the authors developed a wearable electrocardiographic (ECG) monitoring and alerting system " iHeart ". iHeart continuously monitors patient's ECG in his/her daily activities and issues an alert to the patient as well as(More)
This paper addresses the problem of developing low-complexity authentication challenge-response protocols based on employment of pseudorandom sequences generated by cellular automata (CA). The proposed protocol is an improved variant of the recently reported HB<sup>#</sup> protocol. Oppositely from the reported HB-protocols the proposed one is based in the(More)
Hadoop is a distributed processing platform for analyzing a large amount of data. It uses MapReduce framework for distributed parallel processing where reduce computation uses all the relevant map computation results obtained in other nodes, thus needs massive amounts of data transfer between nodes. This paper explores how such interdependence between nodes(More)
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