Katsuyuki Yamazaki

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The volume of mass unsolicited electronic mail, often known as spam, has recently increased enormously and has become a serious threat to not only the Internet but also to society. This paper proposes a new spam detection method which uses document space density information. Although it requires extensive e-mail traffic to acquire the necessary information,(More)
—We have been conducting an ecological observation of seabirds. The system used in the previous study utilized the wired network, and has been difficult to construct a scalable sensor network. Furthermore, that system couldn't distinguish types of the seabirds (e.g., male/female parent, chick), which is useful information for biologist to verify their(More)