Takuki Ogawa

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We have developed new dimensionality reduction methods, extended from locality preserving projection (LPP), to estimate age using facial images. LPP seeks a linear transformation matrix such that optimally preserves the neighborhood structure of the data. Our focus has been on expanding LPP by making use of class label information. Specifically, one of our(More)
Trie is one of the data structures for keyword matching. The trie is used in natural language processing, IP address routing, and so on. It is represented by the matrix form, the link form, the double array, and LOUDS. The double array combines retrieval speed of the matrix form with compactness of the list form. LOUDS is a succinct data structure using(More)
This paper proposes a novel model estimation method, which uses nested Gibbs sampling to develop a mixtureof-mixture model to represent the distribution of the models components with a mixture model. This model is suitable for analyzing multilevel data comprising framewise observations, such as videos and acoustic signals, which are composed of frame-wise(More)
For context-based recommendation systems, it is necessary to detect affirmative and negative intentions from answers. However, traditional studies cannot determine these intentions from indirect speech acts. In order to determine these intentions from indirect speech acts, this paper defines a recommendation tree and proposes an algorithm of deriving(More)
Relations with other objects are sure to exist in one object such as the persons, things and the enterprises. The structure related to these objects is called a social network. In recent years, the extraction of object relationships using web corpora is researched to visualise a social network. This paper aims to extract object relationships including the(More)
With a fast paced economy, organization need to make a decision as fast as possible, access to large text documents or other information sources is important during decision making. Unfortunately, there are many shortcomings of the handheld devices, such as limited resolution and narrow bandwidth. In order to overcome the shortcomings, this paper proposes(More)
A study of a communication robot that aims to ease stress and to heal is very important. This paper develops a dialogue robot with haptic interactions, and two experiments are carried out to estimate the effects of dialogue and haptic interactions. From experimental results, the haptic interactions have more effective than dialogue in the interest(More)
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