Ken Sakamura

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Ubiquitous computing is a new information and communication technology that utilize a large number of cooperative small nodes with computing and/or communication capabilities such as handheld terminals, smart mobile phones, sensor network nodes, contactless smart cards, RFIDs (Radio Frequency IDentification), and so on. This paper proposes the concept of(More)
In ubiquitous computing environments, many tiny computers cooperate, adapting their behaviors according to real-world contexts to provide flexible information services. These information services can't be realized without technology standardization in a broad area. In this article, we discuss the principle of ubiquitous computing technology standardization(More)
In this paper, we propose a robust natural language interface called CASIS for controlling devices in an intelligent environment. CASIS is novel in a sense that it integrates physical context acquired from the sensors embedded in the environment with traditionally used context to reduce the system error rate and disambiguate deictic references and(More)
Although current electronic commerce (e-commerce) technology plays an important role in today's economy, it is still not full-fledged for the lack of enough security and flexibility. We propose eTNet, a smart card network architecture for electronic transactions, which fills up the gap and further extends our previous work, the eTRON architecture. The eTNet(More)