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- Shinji Hara, Yutaka Yamamoto
- 1985 24th IEEE Conference on Decision and Control
- 1985

- Yutaka Yamamoto
- 1988

This paper studies matrix fractional representation for impulse responses of a certain class of infinite-dimensional linear systems which contains, in particular, delay-differential systems. Such impulse responses are called pseudo-rational in this paper. This fractional representation is effectively used to derive concrete function space models from theâ€¦ (More)

- Yutaka Yamamoto
- 1994

This paper presents a new framework for hybrid sampled-data control systems. Instead of considering the state only at sampling instants, this paper introduces a function piece during the sampling period as the state, and gives an infinite-dimensional model with such a state space. This gives the advantage that sampled-data systems with built-in intersampleâ€¦ (More)

- Masaaki Nagahara, Yutaka Yamamoto
- IEEE Transactions on Signal Processing
- 2012

This paper proposes a min-max design of noise-shaping delta-sigma modulators. We first characterize the all stabilizing loop-filters for a linearized modulator model. By this characterization, we formulate the design problem of lowpass, bandpass, and multi-band modulators as minimization of the maximum magnitude of the noise transfer function (NTF) in fixedâ€¦ (More)

- Yutaka Yamamoto, Shinji Hara
- 26th IEEE Conference on Decision and Control
- 1987

This paper studies the relationships among various stability notions for a class of infinite-dimensional systems, which contains a class of systems not covered by the existing method, e.g., those having infinitely many unstable poles. It is proved thai i) internal L2-stability and exponential stability are equivalent; ii) internal stability impliesâ€¦ (More)

- Saori Tomita, Zhenhuan Zhang, +4 authors Hirotaka Iwase
- Cancer science
- 2009

Estrogen receptor (ER) alpha plays a crucial role in normal breast development and has also been linked to mammary carcinogenesis and clinical outcome in breast cancer patients. However, the molecular mechanisms controlling the expression of ERalpha are as yet not fully understood. Gene amplification is one of the important factors regulating proteinâ€¦ (More)

- Yutaka Yamamoto, Anton G. Madievski, Brian D. O. Anderson
- Automatica
- 1999

This paper proves that the frequency response gains of fast-sample/fasthold approximations of a sampled-data system converge to that of the original system as the sampling rate gets faster. While this may appear to hold trivially, there is a serious technical difficulty, and the proof is indeed nontrivial. It is also guaranteed that this convergence isâ€¦ (More)

- Junichi Kurebayashi, Sumiko Okubo, +4 authors Hiroshi Sonoo
- Cancer Chemotherapy and Pharmacology
- 2006

Purpose: Anaplastic thyroid cancer (ATC) is one of the most aggressive malignancies. Although multidisciplinary treatments have been introduced, patients with this disease rarely survive longer than 1Â year. These findings prompted us to investigate the antitumor activity of molecular targeting agents in thyroid cancer cells. Methods: Two tyrosine kinaseâ€¦ (More)

- Yutaka Yamamoto
- 1993

The basic features of a special type of learning control scheme, currently known as repetitive control are reviewed. It is seen that this control scheme also induces varied interesting theoretical problemsâ€” particularly those related to infinite-dimensional systems. They include such problems as the internal model principle, minimal representation ofâ€¦ (More)

In this note, a simple proof is given for the Hamiltonian solution to the Hâˆž optimal sensitivity for plants with arbitrary inner transfer function. The approach combines skew Toeplitz theory and state space representations, and gives rise to a straightforward and basis-free methodology.