Hiroaki Morikawa

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Based on the Open Data Charter of G8 in 2013, the Japanese government published a dataset covering approximately 4.4 million corporations in December 2015, but the dataset is merely rated as 3-star in the 5-star rating system of Open Data. To improve usability, we defined a schema for corporation data, converted the dataset into 5-star using this schema,(More)
In this paper, we present a fast and practical algorithm for a map-matching problem searching a path on a given graph that minimizes Fréchet distance from a given trajectory, which is a natural measurement based on the sequential order of the trajectory. However, it sometimes costs seriously to compute the Fréchet distance while making(More)
In this paper, we study the problem of efficiently mining frequent partite episodes that satisfy partwise constraints from an input event sequence. Through our constraints, we can extract episodes related to events and their precedent-subsequent relations, on which we focus, in a short time. This improves the efficiency of data mining using trial and error(More)
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