開催日時：2009年9月11日(金) 14:30〜16:00

場所：理化学研究所　研究本館 4F会議室（本館435,437）
世話人：梅野健, 佐藤譲
主催：理化学研究所 次世代移動体通信研究チーム
共催：応用数理学会応用カオス研究部会, 株式会社カオスウェア

■プログラム
14:30-16:00
"4D Tomography and its Future" (仮題）
Dr. Warsito Purwo Taruno
(Director, CTECH Labs, Edwar Technology. Co., Indonesia)

インドネシアからWarsito博士が来日するのに伴い、記念講演会を開催することになりました。
Warsito博士は、4Dトモグラフィーの開発で世界的な業績を挙げており、インドネシアの2009年のACHMAD BAKRIE AWARD のテクノロジー部門で受賞されております。
ご興味ある方はぜひご参加ください。

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開催日時：2009年 1月16日(金), 1月30日(金), 2月6日(金) 10:30〜12:00

Place : 2F Seminar room 224, Main Research Building, RIKEN Wako Campus
Speaker : Yoshisuke Ueda (Waseda University / RIKEN)
Language : Japanese

Date : Friday, Jan 16, 2009, 10:30-12:00
Title : "Chaos: a phenomenology of broken-egg (1)"

Date : Friday, Jan 30, 2009, 10:30-12:00
Title : "Chaos: a phenomenology of broken-egg (2)"

Date : Friday, February 6, 2009, 10:30-12:00
Title : "Chaos: a phenomenology of broken-egg (3)"

Abstract
The goal of this lecture is to provide fundamental knowledge of important subjects of chaotic phenomena in real physical systems. The physical systems introduced in this lecture series are simple two electrical and electronic circuits. Both circuits are represented by two dependent state variables and sine wave external forcing signal. These are regarded as the simplest and representative ones in the extensive field of natural science.
The one of the circuits is a series resonance circuit which consists of single resistor, capacitor, and inductor. Inductor shows nonlinear saturation characteristics between with magnetic flux in the iron core and exciting current, i.e., saturable iron core. This oscillatory system shows a stationary equiliblium without external applied voltage, therefore (, it is) called Forced Oscillatory System.
The other circuit is a so-called negative resistance oscillator, which keeps self sustained oscillation, i.e., producing oscillation with constant amplitude and frequency. Synchronization phenomana occur when a periodic forcing signal is applied to the system depending on the frequency and amplitude of the external periodic signals. In the case when synchronization does not attained, or goes "wrong," aperiodic beat oscillation emerges. therefore the system is called Forced Self-Oscillatory System.
It is well known that chaos could be observed in both of the above systems.
At present, it is said that the data collecting by using Ueda's analog computer on the 27th of November, 1961, is the oldest example of chaos discovered in an actual physical system. The data was nothing like the smooth oval closed curves (almost periodic oscillations), but was more like a "broken egg" with jagged edges.
This lecture will unravel a complex phenomenon, so-called "chaos", based on lecturer's own experiences, while nowadays, concepts of chaos has been well-established by many physicists and mathematicians.
We use "Theory of Chaotic Phenomena, CORONA Publishing, 2008 (in Japanese), as a textbook for this lecture series. It is written based on the lecture notes of the class at Under Graduate and Graduate School of Electrical and Electronic Engineering Department, Kyoto University since 1966, together with Complex Systems Department, Future University-Hakodate since 2000. It also contains part of research results that the lecturer carried out himself since 1959.

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開催日時：2008年 12月19日(金) 9:00〜12:00 (2 lectures)

Place : Small seminar room, Welfare and Conference Building, RIKEN Wako Campus
Speaker : Yoshisuke Ueda (Waseda University / RIKEN)
Language : Japanese

Title : "Chaos: a phenomenology of broken-egg"

Abstract
The goal of this lecture is to provide fundamental knowledge of important subjects of chaotic phenomena in real physical systems. The physical systems introduced in this lecture series are simple two electrical and electronic circuits. Both circuits are represented by two dependent state variables and sine wave external forcing signal. These are regarded as the simplest and representative ones in the extensive field of natural science.
The one of the circuits is a series resonance circuit which consists of single resistor, capacitor, and inductor. Inductor shows nonlinear saturation characteristics between with magnetic flux in the iron core and exciting current, i.e., saturable iron core. This oscillatory system shows a stationary equiliblium without external applied voltage, therefore (, it is) called Forced Oscillatory System.
The other circuit is a so-called negative resistance oscillator, which keeps self sustained oscillation, i.e., producing oscillation with constant amplitude and frequency. Synchronization phenomana occur when a periodic forcing signal is applied to the system depending on the frequency and amplitude of the external periodic signals. In the case when synchronization does not attained, or goes "wrong," aperiodic beat oscillation emerges. therefore the system is called Forced Self-Oscillatory System.
It is well known that chaos could be observed in both of the above systems.
At present, it is said that the data collecting by using Ueda's analog computer on the 27th of November, 1961, is the oldest example of chaos discovered in an actual physical system. The data was nothing like the smooth oval closed curves (almost periodic oscillations), but was more like a "broken egg" with jagged edges.
This lecture will unravel a complex phenomenon, so-called "chaos", based on lecturer's own experiences, while nowadays, concepts of chaos has been well-established by many physicists and mathematicians.
We use "Theory of Chaotic Phenomena, CORONA Publishing, 2008 (in Japanese), as a textbook for this lecture series. It is written based on the lecture notes of the class at Under Graduate and Graduate School of Electrical and Electronic Engineering Department, Kyoto University since 1966, together with Complex Systems Department, Future University-Hakodate since 2000. It also contains part of research results that the lecturer carried out himself since 1959.


Host
Ken Umeno (Next Generation Mobile Communications Laboratory Integrated Collaborative Research Program with Industry, RIKEN in cooperation with RIKEN Mathematical Science Group)

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開催日時：2008年9月16日(火) 13:00～17:00

場所：みずほ銀行本店　大手町本部14階講堂
主催：独立行政法人理化学研究所（次世代移動体通信研究チーム）
共催：みずほ銀行
協賛：アポロ電子(株)、(株)エヌアイデイ、(株)カオスウェア、(株)クオラス、日本応用数理学会応用カオス研究部会、プラムシステム(有)、みずほインベスターズ証券(株)、みずほキャピタル(株)

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開催日時：2008年9月9日(火)～9月12日(金)

場所：奈良県新公会堂

【Banquet speech】
Yoshisuke Ueda (Waseda Univ. / RIKEN)
＊YouTubeにて視聴できます▶http://www.youtube.com/watch?v=h8hoc2ixe4o

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開催日時：2008年6月20日(金)

場所：理化学研究所　研究本館2Fセミナー室(224,246)
世話人：梅野健(理研)、佐藤譲(北大/理研)
主催：理化学研究所
共催：北大電子研/数学連携研究センター, 応用数理学会応用カオス研究部会, 株式会社カオスウェア

■プログラム

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開催日時：2008年2月8日(金)

場所：理化学研究所 大河内記念ホール
世話人：梅野健(理研)、佐藤譲(北大/理研)
主催：理化学研究所
共催：北大電子研, 応用数理学会応用カオス研究部会, 株式会社カオスウェア

■プログラム

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開催日時：2006年11月8日（水）

場所：NTT コミュニケーション科学基礎研究所 NTT京阪奈ビル３階　大会議室

■プログラム
15:00～16:30
"Chaotic yet consistent? - Synchronization of driven nonlinear systems -"
Prof. Rajarshi Roy (Department of Physics, University of Maryland, USA)

【Abstract】
Dynamical systems respond to external signals in several different ways.
We explore experimentally how complex waveforms (chaotic or noisy) with different characteristics generate responses in driven nonlinear optical systems. We look first at generalized synchronization, when the system is driven by a chaotic waveform recorded from the system itself.
We then enlarge the set of drive signals to include noisy waveforms.
The notion of "consistency" describes how a system may respond to either type of repetitive driving, starting from different initial conditions.
Numerical simulations of mathematical models of the optical systems reveal the role of internal noise, dynamical instabilities as well as the influence of drive waveform design on the consistency of response. We point out possible applications of these ideas to dynamical non-destructive testing of structures and devices - biological, mechanical, electronic and optical.

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