Accès ouvert
2013
article
OpenAlex
Takaaki Tanaka, T. Nakamizo, Takahiro Aoki, Shinichi Kida et autres
This article describes a rapid fringe detection technique for detecting fringes that appear transiently in Nasu observational data. It can quickly and accurately detect fringe waveforms that are not derived from steady sources in the drift-scan data according to constant numerical criteria. …
de, jp, us
(code pays fourni par la source)
Accès ouvert
2012
article
OpenAlex
Takaaki Tanaka, T. Nakamizo, Takahiro Aoki, Shinichi Kida et autres
We have developed an analysis method for finding flux variabilities of the fringes in drift-scan interferometric data at 1.4 GHz obtained from the Nasu observatory. This method uses the expectation data of the Nasu observation generated from a radio sky survey catalog …
de, jp, us
(code pays fourni par la source)
Accès ouvert
2012
article
OpenAlex
Takahiro Aoki, Takaaki Tanaka, Kotaro Niinuma, Kuniyuki Asuma et autres
This article proposes a method for calculating the false-detection/alarm rate for the Nasu interferometric sky survey. This method considers both spectral intensity and time width of a fringe in the time-frequency domain. It detects periodic waves with a given time width in …
jp, us
(code pays fourni par la source)
2003
conference-paper
OpenAlex
K. Harada, Yuqi Ji, Yusuke KATAYAMA, C.J. Chen et autres
A novel method for improving the stability of the AVR (automatic voltage regulator) constant voltage transformer for triport UPS (uninterruptible power supply) systems is introduced. An active filter with an operational amplifier as the feedback element for controlling the AVR is shown …
jp
(code pays fourni par la source)
2003
conference-paper
OpenAlex
Yasutaka Kawata, Hidemitsu Koike, F. Tominaga, T. Nakamizo et autres
The development of a triport UPS (uninterruptible power system) rated at 450 kVA in three-phase that combines three units of triport UPSs, each rated at 150 kVA in three-phase, in parallel connection has been completed. With multiple units of triport UPSs running …
jp
(code pays fourni par la source)
2002
conference-paper
OpenAlex
Toshiki Oguchi, Atsushi Watanabe, T. Nakamizo
This paper considers the input-output linearization problem for retarded nonlinear systems which have time-delays in the state. By using an extension of the Lie derivative for functional differential equations, we derive a coordinate transformation and a state feedback to obtain the linear …
jp
(code pays fourni par la source)
1997
conference-paper
OpenAlex
Toshiki Oguchi, Atsushi Watanabe, T. Nakamizo
Considers a finite pole assignment problem for nonlinear systems with time delays in state variables. Extensions of the Lie derivative and the Lie bracket are introduced to differential-difference control systems which make it possible to derive a coordinates transformation and a state …
jp
(code pays fourni par la source)
Accès ouvert
1995
conference-paper
OpenAlex
Toyoyuki Honjo, Kenji Tanaka, T. Nakamizo
Although LMS adaptive filters have been applied to many signal processing applications, there exists a critical limitation of the conventional adaptive filter when it is applied for a real time signal processing. It is simply because of its required lengthy convolution (filtering) …
in
(code pays fourni par la source)
Accès ouvert
1994
conference-paper
OpenAlex
Kazuhiko Iwami, Kenji Tanaka, T. Nakamizo
While Kalman filter has found frequent applications to many signal processing problems, its variant namely, the square root information filter (SRIF) method that is more accurate, stable and efficient than the original Kalman filter algorithm received little attention. It is partialy because …
in
(code pays fourni par la source)
Accès ouvert
1987
article
OpenAlex
K. Harada, Akihiko Katsuki, Kazuhiro Murata, T. Nakamizo et autres
Operations of parallel-connected Triport UPS systems are discussed. The parallel operation becomes important (1) for increasing the rated kVA of the system and (2) for realizing a redundant system to improve the system reliability. We first consider the typical parallel operation of …
jp
(code pays fourni par la source)
1986
conference-paper
OpenAlex
K. Harada, F. Tominaga, T. Nakamizo, C. J. Chen
Triport transformer with a series circuit of a reactor and two antiparallel thyristors connected in parallel with its output port keeps output voltage constant by controlling the firing angle of the thyristors. However the controlled constant voltage regulator will bring an instability …
jp
(code pays fourni par la source)
1982
article
OpenAlex
Nobuaki Kobayashi, T. Nakamizo
A method is presented for designing an observer for the state of a linear time-invariant system with unknown inputs. The structure algorithm developed by Silverman is applied to obtain the observer which estimates the maximum estimable subspace of the state. It is …
jp
(code pays fourni par la source)