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Matrix clustering is a new data mining method which extracts a dense sub-matrix from a large sparse binary matrix. We propose an e cient algorithm named the ping-pong algorithm which enables real-time mining of a large sparse matrix. This article describes the application of matrix clustering to Web usage mining. Matrix clustering can be applied to Webâ€¦ (More)

- Keiji Hirata, Reki Yamamoto, +6 authors Kazuaki Rokusawa
- FGCS
- 1992

- Kazuaki Rokusawa, Akihiko Nakase, Takashi Chikayama
- New Generation Computing
- 1996

This paper describes external reference management and distributed unification in a distributed implementation of a concurrent logic programming language KL1. This implementation is based on the KLIC system. KLIC has a feature calledgeneric objects that enable easy modification and extension of the system without changes in the core implementation. Thisâ€¦ (More)

- Akihiko Nakase, Kazuaki Rokusawa, Tetsuro Fujise, Takashi Chikayama
- Workshop on Design and Impl. of Parallel Logicâ€¦
- 1994

- Yukihisa Fujita, Akihiko Nakase, Yasuko Nakayama, Fujio Toriumi, Kenichiro Ishii
- Systems and Computers in Japan
- 2007

- Kazuto Kubota, Akihiko Nakase, Shigeru Oyanagi
- Proceedings 15th International Parallel andâ€¦
- 2001

This paper proposes a parallel data-mining algorithm and its implementation on a PC cluster. The decision tree is a widely used data-mining algorithm for classifying records in a database. Simple parallelization of decision tree generation is not efficient because of the load imbalance caused by the form of the generated tree. The SPRINT algorithm solvesâ€¦ (More)

- Kazuaki Rokusawa, Akihiko Nakase, Takashi Chikayama
- Workshop on Design and Impl. of Parallel Logicâ€¦
- 1994

Abst rac t . Quiescence detection is a fundamental facility for parallel and distributed processing. This paper describes schemes for quiescence detection in a distributed KLIC implementation. KLIC is a portable implementation of concurrent logic programming language KL1. Termination is detected using the weighted throw counting (WTC) scheme. Based on theâ€¦ (More)

- Shigeru Oyanagi, Kazuto Kubota, Akihiko Nakase
- WEBKDD
- 2002

Sequence pattern mining is one of the most important methods for mining WWW access log. The Apriori algorithm is well known as a typical algorithm for sequence pattern mining. However, it suffers from inherent difficulties in finding long sequential patterns and in extracting interesting patterns among a huge amount of results. This article proposes a newâ€¦ (More)

- Shuichiro Imahara, Makoto Sato, Akihiko Nakase
- PRICAI
- 2004

- Akihiko Nakase
- Sapporo igaku zasshi. The Sapporo medical journal
- 1963