Shojiro Nishio

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Methods for efficient mining of frequent patterns have been studied extensively by many researchers. However, the previously proposed methods still encounter some performance bottlenecks when mining databases with different data characteristics, such as dense vs. sparse, long vs. short patterns, memory-based vs. disk-based, etc. In this study, we propose a(More)
Photo sharing is one of the most popular Web services. Photo sharing sites provide functions to add tags and geo-tags to photos to make photo organization easy. Considering that people take photos to record something that attracts them, geo-tagged photos are a rich data source that reflects people's memorable events associated with locations. In this paper,(More)
Wikipedia has become a huge phenomenon on the WWW. As a corpus for knowledge extraction, it has various impressive characteristics such as a huge amount of articles, live updates, a dense link structure, brief link texts and URL identification for concepts. In this paper, we propose an efficient link mining method pfibf (Path Frequency Inversed Backward(More)
In this paper, we propose a TDMA slot assignment protocol to improve the channel utilization, which controls the excessive increase of unassigned slots by changing the frame length dynamically. Our proposed protocol assigns one of the unassigned slots to a node which joins the network. If there is no unassigned slots available, our proposed protocol(More)
Wikipedia, a huge scale Web based encyclopedia, attracts great attention as an invaluable corpus for knowledge extraction because it has various impressive characteristics such as a huge number of articles, live updates, a dense link structure, brief anchor texts and URL identification for concepts. We have already proved that we can use Wikipedia to(More)
In wireless sensor networks (WSNs), many applications require sensor nodes to obtain their locations. Now, the main idea in most existing localization algorithms has been that a mobile anchor node (e.g., global positioning system-equipped nodes) broadcasts its coordinates to help other unknown nodes to localize themselves while moving according to a(More)
With the popularization of today’s mobile devices, the environment that enables us to publish and utilize information independent of location and time has been actualized. In the future, various kinds of sensors such as GPS as well as network-enabled appliances will also be connected to the Internet. By utilizing various kinds of information acquired(More)
JIAN PEI1,∗, JIAWEI HAN2, HONGJUN LU3,†, SHOJIRO NISHIO4, SHIWEI TANG5 and DONGQING YANG5 1School of Computing Science, Simon Fraser University, Burnaby, BC, Canada V5A 1S6 E-mail: 2University of Illinois Urbana, IL 61801, USA E-mail: 3Hong Kong University of Science and Technology, Hong Kong 4Osaka University, Osaka, Japan(More)