#### Filter Results:

- Full text PDF available (9)

#### Publication Year

1986

2014

- This year (0)
- Last 5 years (1)
- Last 10 years (7)

#### Publication Type

#### Co-author

#### Publication Venue

#### Key Phrases

Learn More

- S. Morimoto, H. Nakayama, M. Sanada, Y. Takeda
- IEEE Transactions on Industry Applications
- 2005

This paper proposes a variable-speed wind generation system using an interior permanent-magnet synchronous generator (IPMSG). The armature current vector of the IPMSG is optimally controlled according to the generator speed in order to maximize the generated power from the wind turbine. The IPMSG is controlled by the loss-minimization control with maximum… (More)

- Tomonari Sei, Nobuki Takayama, +4 authors Katsuyoshi Ohara
- ArXiv
- 2010

We give a new algorithm to find local maximum and minimum of a holonomic function and apply it for the Fisher-Bingham integral on the sphere S n , which is used in the directional statistics. The method utilizes the theory and algorithms of holonomic systems.

We present software packages for the holonomic gradient method (HGM). These packages compute normalizing constants and the probabilities of some regions. While many algorithms which compute in-tegrals over high-dimensional regions utilize the Monte-Carlo method, our HGM utilizes algorithms for solving ordinary differential equations such as the… (More)

- Hiromasa Nakayama
- J. Symb. Comput.
- 2009

- Hiromasa Nakayama, Kenta Nishiyama
- ICMS
- 2010

- C. Ohmori, E. Ezura, +8 authors M. Yamamoto
- 1999

Very high field-gradient has become available by a new Magnetic Alloy (MA)-loaded cavity developed for high intensity proton synchrotrons. The available RF voltage per core is ten times larger than that of the ordinary ferrite core. The maximum voltage of 20 kV has been achieved by the High-Field Gradient Cavity(HGC) of 40 cm in length[1]. Because the… (More)

- Hiromasa Nakayama, Nobuki Takayama
- ArXiv
- 2010

we give an approximate algorithm of computing holonomic systems of linear differential equations for definite integrals with parameters. We show that this algorithm gives a correct answer in finite steps, but we have no general stopping condition. We apply the approximate method to find differential equations for integrals associated to smooth Fano… (More)

- Hiromasa Nakayama
- ICMS
- 2006

- H Nakayama
- Nihon Ika Daigaku zasshi
- 1986

- K. Saito, M. Fujieda, +8 authors M. Yamamoto
- 1998

A broad band RF cavity loaded with magnetic alloy cores has been developed for the Japanese Hadron Facility synchrotrons. Its Q-value can be chosen at between 0.5 and 5. To reduce transient beam loading effects, a small Q-value (< 3) is preferable to shorten the transient period. However, the circulating beam current of up to 7 A will induce a spurious… (More)