Keisuke Takahashi

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It is well-known in the literature that the choice of a strategy representation scheme has a large effect on the evolution of cooperative behavior in an IPD (Iterated Prisoner's Dilemma) game. Different representation schemes often lead to totally different results. The evolution of cooperative behavior is easy under some representation schemes while it is(More)
This paper presents part of an on-going project to design a wearable supportive device, in particular for the facial paralyzed patients to enhance facial expressiveness. As various complications can result in facial disfigurement and loss of functionality in facial muscles it is required to develop a supporting device for people with such conditions. The(More)
In this paper, we propose a novel wearable sensor device for the measurement of the head orientation and relative position against the body trunk in real-time. It is known that in natural walking, human locomotion is preceded by changes in head orientation [1, 2, 3] and the walking direction can therefore be predicted by observing the head orientation. We(More)
This paper discusses the basic design properties of the use of colors in Web documents, and also discusses the properties of combinations of colors in a Web document. The results can be a theoretical basis for a findable, readable and understandable design of documents. We usually use several different colors in documents with some intentions, but the(More)
We argue that exploratory visual analytics frameworks are needed for efficient big data research and datadriven research, and exemplify with experiences from our research. Such frameworks can be used for iterative hypothesis generation and hypothesis verification, and for exploratory creation of appropriate explanatory variables to use in data acquisition(More)
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