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- Shuichi Ichikawa, Shoji Yamamoto
- FPL
- 2002

The subgraph isomorphism problem has various important applications, although it is generally NP-complete and difficult to solve. This paper examines the feasibility of a data dependent circuit for the subgraph isomorphism problem, which is particularly suitable for FPGA implementation. For graphs of 32 vertices, the average logic scale of data dependent… (More)

- Kazuya Otsubo, Yusuke Wakabayashi, +6 authors Hiroshi Kitagawa
- Nature materials
- 2011

Nanotubes are generally prepared from their constituent elements at high temperatures, and thus it is difficult to control their size, shape and electronic states. One useful approach for synthesizing well-defined nanostructures involves the use of building blocks such as metal ions and organic molecules. Here, we show the successful creation of an assembly… (More)

Data dependent circuits are logic circuits specialized to specific input data. They are smaller and faster than the original circuits, although they are not reusable and require circuit generation for each input instance. This study examines data dependent designs for subgraph isomorphism problems, and shows that a simple algorithm is faster than an… (More)

We study the spin-1/2 two-leg Heisenberg ladder with four-spin ring exchanges under a magnetic field. We introduce an exact duality transformation which is an extension of the spin-chirality duality developed previously and yields a new self-dual surface in the parameter space. We then determine the magnetic phase diagram using the numerical approaches of… (More)

- Sayuri Kamimigaki, Shoji Yamamoto, Keita Hirai, Norimichi Tsumura, Toshiya Nakaguchi, Yoichi Miyake
- Color Imaging Conference
- 2009

- Shoji Yamamoto, Masashi Sawabe, Mayu Yokoya, Norimichi Tsumura
- CGIV
- 2012

Subgraph isomorphism problem has various important applications, while it is generally NP-complete and difficult to solve. Though Ullmann's algorithm can be implemented by parallel hardware to accelerate the execution, it requires too much hardware to implement. This paper examines the feasibility of data dependent circuit for subgraph isomorphism problem.… (More)

- Mayu Yokoya, Shoji Yamamoto, +4 authors Norimichi Tsumura
- CCIW
- 2011

- Natsumi Hosokawa, Mayu Yokoya, Shoji Yamamoto, Norimichi Tsumura
- Color Imaging Conference
- 2012

In order to confirm the picture of domain-wall excitations in the hidden an-tiferromagnetic order of the Haldane phase, the structure of the low-lying excitations in the S = 1 antiferromagnetic Heisenberg chain is studied by a quantum Monte Carlo method. It is confirmed that there exists a finite energy gap between the first-and the second-excited states at… (More)