Presentations

2019

lnvited Talk, Ko Okumura
Velocity jump in crack propagation on sheet samples: nano-scale glass transition at a crack tip and the effect of boundary condition
Materials Research Meeting 2019
Yokohama Symposia
December 10-14, 2019

Poster, Yukina M. Koga and Ko Okumura
Quasi-two-dimensional coalescence of liquid in another liquid
Materials Research Meeting 2019
Yokohama Symposia
December 10-14, 2019

2018

Selected Oral Talk, Ko Okumura
Bubble bursting and air-film pinch-off in confined space: scaling and self-similarity
Liquids @ Interfaces 2018 University of Bourdeux, Bourdeaux (France)
October 22-25, 2018

Seminar, Ko Okumura
Simple views on some viscous dynamics of drops and bubbles in confined space
Seminar as part of the Oxford Fluids Network, Oxford University, Oxford, UK, August 31, 2018.

Discussion Leader
, Ko Okumura, Grains and Interfaces
Poster, Ko Okumura, Granular flow in confined geometries: jamming, clogging, and instability
The Interdisciplinary Nature of Particulate Systems
Granular Matter, Gordon Research Conference
Stonehill College, Massachusetts, USA,
July 22-27, 2018

Selected Oral Talk, Ko Okumura
Simple modelling of biological and artificial composites consisting of soft and hard elements: from nacre, spider-web, to Kirigami
10th European Solid Mechanics Conference (ESMC10) Bologna, Italy July 2-6, 2018

Selected Oral Talk, Ko Okumura
“Granular flow in confined geometries: jamming, clogging, and instability”
10th European Solid Mechanics Conference (ESMC10), Bologna (Italy), July 2-6, 2018.

Selected Oral Talk, Ko Okumura
Dynamics of drops and bubbles in confined space
16th Conference of the International Association of Colloid and Interface Scientists (IACIS)
Rotterdam, the Netherlands, 21 – 25 May, 2018

Selected Oral Talk, Y. Morishita, K. Tsunoda, K. Urayama, A. Kubo, Y. Umeno, N. Sakumichi, Y. Aoyanagi, and K. Okumura* (*: presenter),
Emergent frontiers of the fixed-grip constant crack propagation in polymer sheets: experimental, numerical, and theoretical studies
17th international conference on Deformation, Yield and Fracture of Polymers (DYFP) 2018, Rolduc, Abbey, Kerkrade, NL., March 25-29, 2018

28th The Materials Research Society of Japan
Kitakyushu International Conference Center, Fukuoka, Japan, December 18-20, 2018
F-9:Design and Characterization of Tough Polymers (International Session)
第28回日本MRS年次大会 F-9 : タフポリマーの設計とその特性解析
北九州国際会議場、西日本総合展示場、2018年12月18日~20日
Poster, Yuko Aoyanagi and Ko Okumura
Numerical simulation of crack propagation in a two-dimensional viscoelastic network
Poster, Midori Isobe and Ko Okumura
Mechanical response of kirigami sheet materials
「切り紙構造シートの力学応答」

Poster, Ko Okumura
Simple views on drag friction, jamming, film bursting, topological transition, and kirigami
TGM 3rd Edwards Symposium – New Horizons in Soft Matter, Centre for Mathematical Sciences, Cambridge, UK, September 5 – 7, 2018.

17th international conference on Deformation, Yield and Fracture of Polymers (DYFP) 2018, Rolduc, Abbey, Kerkrade, NL., March 25-29, 2018
1. Poster, Naoyuki Sakumichi and Ko Okumura,
Exactly solvable model for a velocity jump observed in crack propagation in viscoelastic solids,
2. Poster, Yuko Aoyanagi and Ko Okumura,
Crack propagation in two-dimensional nonlinear viscoelastic network,
3. Poster, Midori Isobe and Ko Okumura,
Mechanical response of kirigami sheet materials
Dutch Polymer Institute (DPI) bestowed the third poster prize with a premium on Midori Isobe on March 28!

APS March Meeting 2018, Los Angeles, California, USA, March 5-9, 2018.
1. Oral Presentation, Ko Okumura
Granular flow in confined geometries: jamming, clogging, and instability
2. Oral Presentation, Midori Isobe and Ko Okumura,
Mechanical response of kirigami sheet materials

2017

Selected Oral Talk, Ko Okumura
Scaling Views on the Strength and Toughness of Bio-Composites Consisting of Soft and Hard Elements
The 2017 MRS Fall Meeting
Hynes Convention Center and Sheraton Boston Hotel in Boston, Massachusetts, USA, November 26-December 1, 2017

Keynote Lecture, Ko Okumura
Simple modeling of toughness and strength of polymer-based biological and industrial materials
2017 Japan-Taiwan Bilateral Symposium on Physical Chemistry of Tough Polymers for Future Vehicles
National Cheng Kung University, Taiwan
November 20-21, 2017

Invited Talk, Ko Okumura
Simple modeling of biological composites, kirigami, and viscoelastic crack propagation
Mini-symposium: “Material Modelling”
Simulation for Additive Manufacturing (ECCOMAS Thematic Conference)
Munich, Germany, 11th-13th October 2017

Invited Talk, Ko Okumura
Granular flow in confined geometries: jamming, clogging, and instability
Invited Session: “Micro-macro: From Discrete Particles to Continuum Models of Granular Mechanics”
The V International Conference on Particle-Based Methods (Particles 2017; ECCOMAS Thematic Conference)
Hannover, Germany, 26–28th September 2017

Invited Talk, Ko Okumura
Simple Views on the Toughness and Strength of Polymer-Based Biological and Industrial Materials, GSS-ImPACT JOINT SYMPOSIUM on Advanced Soft Matter: From Single Molecule to Tough Polymers, Hokkaido University, Hokkaido, Japan, August 7-8, 2017.

Selected Oral Talk, Ko Okumura
Dynamics of drops and bubbles in a confined space
DROPLETS 2017, UCLA, Los Angeles, CA, USA, JULY 24-26, 2017

Invited Talk, Ko Okumura
Simple models and scaling arguments for understanding miscellaneous problems in soft matter physics
JSPS A3 Workshop on soft matter
TOKYO ELECTRON House of Creativity, Tohoku Univ., Sendai, Japan, January 18-20, 2017

Poster, Midori Isobe and Ko Okumura
Mechanical response of kirigami sheet materials
2017 Japan-Taiwan Bilateral Symposium on Physical Chemistry of Tough Polymers for Future Vehicles
National Cheng Kung University, Taiwan November 20-21, 2017

Poster, Naoyuki Sakumichi and Ko Okumura
Exactly solvable model for a velocity jump observed in crack propagation in viscoelastic solids
2017 Japan-Taiwan Bilateral Symposium on Physical Chemistry of Tough Polymers for Future Vehicles
National Cheng Kung University, Taiwan November 20-21, 2017

Poster, Yuko Aoyanagi and Ko Okumura
Crack propagation in a two dimensional nonlinear viscoelastic network
2017 Japan-Taiwan Bilateral Symposium on Physical Chemistry of Tough Polymers for Future Vehicles
National Cheng Kung University, Taiwan November 20-21, 2017

Oral Presentation, Mayuko Murano and Ko Okumura
Rising dynamics of a bubble confined in vertical cells with rectangular cross-sections
70th Annual Meeting of the APS Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2017; Denver, Colorado

Requested Talk, Yuko Aoyanagi and Ko Okumura
Reduction mechanism for the maximum stress at crack tip in nacre-like layered structures
14th International symposium on biomineralization, Tsukuba (Japan), October9-13, 2017.

Poster, Mayuko Murano and Ko Okumura
Bursting Dynamics of Viscous Film without Circular Symmetry: The Effect of Confinement, GSS-ImPACT JOINT SYMPOSIUM, Hokkaido University, Hokkaido, Japan, August 7-8, 2017.

Poster, Midori Isobe and Ko Okumura
Mechanical response of kirigami sheet materials,
GSS-ImPACT JOINT SYMPOSIUM, Hokkaido University, Hokkaido, Japan, August 7-8, 2017.

Oral Presentation, Yuko Aoyanagi and Ko Okumura
Mechanical nonlinearity in the soft layers of Nacre
APS March Meeting 2017, New Orleans, LA, March 13-17, 2017

Oral Presentation, Naoyuki Sakumichi and Ko Okumura
Exactly solvable model for crack propagation in viscoelastic sheets: How to control a velocity jump leading to catastrophic failure
APS March Meeting 2017, New Orleans, LA, March 13-17, 2017

Poster, Atsushi Takei, Mayuko Murano, Marie Tani, Hiroyuki Fujita and Ko Okumura
Thin film partially attached onto elastomer substrate for three-dimensional microstructure
The 30th IEEE International Conference on Micro Electro Mechanical Systems (MEMS 2017), Las Vegas (USA), Jan. 22-26, 2017

2016

Invited Talk, Ko Okumura
Scaling views on mechanical properties of porous materials from polymer foams to kirigami sheet materials
The 15th European Mechanics of Materials Conference (EMMC15)
September 7-9, 2016, Brussels, Belgium.

Selected Plenary Talk, Ko Okumura
Dynamics of drops and bubbles in a confined space
Conference on Multiscale Applications of Surface Tension (MicroMAST’2016)
September 5-8, 2016, Brussels, Belgium.

Selected Oral Talk, Ko Okumura
Dynamics of drops and bubbles in a confined space
International Conference on Statistical Physics (STATPHYS26)
18-22 Jul 2016 Lyon (France)

Invited Talk, Ko Okumura
Dynamics of fluid droplets in a confined space
EMN Meeting on Droplets (EMN Droplets 2016)
May 9 to 13, 2016, San Sebastian, Spain

Invited Talk, Ko Okumura
Jamming, bubbling and cavity collapse in granular materials
Avalanches, plasticity, and nonlinear response in nonequilibrium solids
Kyoto March 7th — 9th, 2016

Poster, Marie Tani and Ko Okumura,
Imbibition of Micro-Patterned Surface,
LIQUIDS @ INTERFACES, Pierre-Gilles de Gennes Institute (IPGG), 17-19 Oct. 2016, Paris, France

Oral Presentation, Mayuko Murano, Natsuki Kimoto and Ko Okumura
Bursting of a bubble confined in between two plates
69th Annual Meeting of the APS Division of Fluid Dynamics,
Portland, USA, 20-22 Nov. 2016

Poster, Marie Tani and Ko Okumura,
Imbibition of Micro-Patterned Surface,
1st International Conference on Multiscale Applications of Surface Tension, 5-8 Sep. 2016, Brussels, BELGUIM

Poster, Marie Tani and Ko Okumura
Imbibition of Micro-Patterned Surface
International Conference on Statistical Physics (STATPHYS26)
18-22 Jul 2016 Lyon (France)

Poster, Yuko Aoyanagi, and Ko Okumura
Crack propagation in two-dimensional viscoelastic networks
International Conference on Statistical Physics (STATPHYS26)
18-22 Jul 2016 Lyon (France)

Poster, Naoyuki Sakumichi and Ko Okumura
An exactly solvable model for discontinuous transitions in the
velocity of crack propagation in viscoelastic solids
International Conference on Statistical Physics (STATPHYS26)
18-22 Jul 2016 Lyon (France)

Oral Presentation, Atsushi Takei and Ko Okumura
Tearing Fracture of Polymer Foam Sheet
APS March Meeting 2016
Baltimore, Maryland, March 14-18, 2016

Poster, Naoyuki Sakumichi and Ko Okumura
High-velocity drag friction near the jamming point in two-dimensional granular materials
Avalanches, plasticity, and nonlinear response in nonequilibrium solids
Yukawa Institute for Theoretical Physics, Kyoto University, March 7-9, 2016

2015

Invited Talk,Ko Okumura
Wetting and toughness of fine and composite structures in biological materials(生物に見られる微細・複合構造の生み出す材料物性:濡れ性と破壊靭性の観点から)
Symposium: Future of biomimetics learning from natural history
The 53rd Annual Meeting of the Biophysical Society of Japan, Kanazawa Univ., September 13-15, 2015, Japan

Requested Talk, Ko Okumura
Simple views on granular materials: jamming, bubbling, clogging, and meandering
Engineering Mechanics Institute Conference, Stanford University, June 16-19, 2015

Invited Talk, Ko Okumura
Simple views on the dynamics of drops and bubbles in confined spaces,
Energy Materials Nanotechnology Meeting on Droplets, Phuket, Thailand, May 8-11, 2015

Seminar Talk, Ko Okumura
Granular physics in two dimension: jamming, bubbling, clogging and meandering,
Seminars PMMH at ESPCI, Paris, March 27, 2015

Selected Oral Talk, Ko Okumura
Simple views on granular dynamics
– jamming, bubbling, clogging, and meandering –
XIV International Workshop on Complex Systems, Fai della Paganella (Italy) March 22-25, 2015

Selected Oral Talk, Ko Okumura
Simple views on granular dynamics
– jamming, bubbling, clogging, and meandering –
Physics of Structural and Dynamical Hierarchy in Soft Matter,
Institute of Industrial Science, University of Tokyo, 16-18 March, 2015

Oral Presentation, Marie Tani, Ryuji Kawano, Koki Kamiya and Ko Okumura
Imbibition of “Open Capillary”: Fundamentals and Applications
http://meetings.aps.org/Meeting/DFD15/Session/D10.6
68th Annual Meeting of the APS Division of Fluid Dynamics, Boston, USA, 22-24 Nov. 2015

Oral Presentation, Mayuko Murano, Natsuki Kimoto and Ko Okumura
Bursting of a bubble confined in between two plates
http://meetings.aps.org/Meeting/DFD15/Session/R35.3
68th Annual Meeting of the APS Division of Fluid Dynamics, Boston,
USA, 22-24 Nov. 2015

Poster, Yuko Aoyanagi, and Ko Okumura
Mechanical nonlinearity of soft layers in a stratified biocomposite optimized for strength
Physics of Structural and Dynamical Hierarchy in Soft Matter
Institute of Industrial Science, University of Tokyo, March 16-18, 2015.

Poster, Atsushi Takei, and Ko Okumura
Crack Growth Under Fixed Energy Release Rate
Physics of Structural and Dynamical Hierarchy in Soft Matter
Institute of Industrial Science, University of Tokyo, March 16-18, 2015.

Poster, Marie Tani and Ko Okumura
Imbibition of Micro-patterned Surfaces
Physics of Structural and Dynamical Hierarchy in Soft Matter
Institute of Industrial Science, University of Tokyo, March 16-18, 2015.

Poster, Mayuko Murano, Natsuki Kimoto, and Ko Okumura
Bursting of a bubble confined in between two plates
Physics of Structural and Dynamical Hierarchy in Soft Matter
Institute of Industrial Science, University of Tokyo, March 16-18, 2015.

Poster, Misato Yahashi and Ko Okumura
Liquid drops falling in a Hele-Shaw cell
Physics of Structural and Dynamical Hierarchy in Soft Matter
Institute of Industrial Science, University of Tokyo, March 16-18, 2015.

Poster, Yuki Yoshimura, Yui Yagisawa, and Ko Okumura
Meandering air flow in a granular bed
Physics of Structural and Dynamical Hierarchy in Soft Matter
Institute of Industrial Science, University of Tokyo, March16-17, 2015

*Invited talks by our member

Invited talk, Marie Tani
“Physical Approach to Capillary Rise on Legs of a Small Animal”
International Workshop on Bionic Engineering (IWBE2015), Beijing, China, 14-16 Oct. 2015

2014

Invited Talk, Ko Okumura
Simple Views on the Dynamics of Fluids in Confined space
and the Fracture of Soft Polymer Foams
NIMS Conference 2014 – A Strong Future from Soft Materials
Tsukuba International Congress Center, July 1 – 3, 2014.

Invited Talk, Ko Okumura
Simple views on the dynamics of fluids in confined space
Workshop on Cross Correlation & Transport Phenomena in Soft Matter, Waseda University, Jan 27-28, 2014

Invited Talk,Ko Okumura
MEMS technology meets scaling laws for biology
Symposium: Beyond Biophysics!: Up-and-coming biophysical science achieved by physical, chemical and micromechanical control of a cell-sized space(Beyond Biophysics!: 細胞スケールにおける物理・化学・機械的な制御が生み出す新たな生物物理学)
The 52rd Annual Meeting of the Biophysical Society of Japan
Sapporo Convention Center, September 25-27, 2014

Selected Oral Talk, Ko Okumura
Simple Views on the Strength and Toughness of Fusion Materials
The 2nd International Symposium on Fusion Materials
Takeda Hall, The University of Tokyo, November 2 – 4, 2014.

Poster (Best Poster Award), Marie Tani, Ryuji Kawano, Koki Kamiya and Ko Okumura Imbibition of Micro-Patterned Surfaces The 2nd International Symposium on Fusion Materials Takeda Hall, The University of Tokyo, November 2 – 4, 2014.

Selected Oral Talk, Maria Yokota and Ko Okumura*
Coalescence and non-coalescence of a liquid droplet to a bath of the same liquid in a confined space under static electric field
Condensed Matter in Paris 2014, Universite Descartes, Paris, Aug 24-29, 2014

Selected Oral Talk, Yuki Kashima and Ko Okumura*
Fracture of thin sheet of soft solidified foam: interplay of visco- and plasto-elasticity
Condensed Matter in Paris 2014, Universite Descartes, Paris, Aug 24-29, 2014

Oral Talk, Yuka Takahara and Ko Okumura*
High-velocity drag friction in granular media near the jamming point
Condensed Matter in Paris 2014, Universite Descartes, Paris, Aug 24-29, 2014

Selected poster, Yuka Takahara and Ko Okumura*
High-velocity drag friction in granular media near the jamming point
Gordon Research Conferences: Granular & Granular-Fluid Flow, Stonehill College, USA, July 20-25, 2014

Oral Presentation, Ko Okumura
Some scaling laws for fluid dynamics in a confined space
APS March Meeting 2014, Denver, USA, 3-7 March 2014

Oral Presentation, Yuka Takehara and Ko Okumura
High-velocity drag friction in granular media near the jamming point
APS March Meeting 2014, Denver, USA, 3-7 March 2014

Oral Presentation, Marie Tani, Daisuke Ishii, Shuto Ito, Takahiro Hariyama, Masatsugu Shimomura and Ko Okumura
Imbibition dynamics on surfaces of legs of a small animal and on artificial surfaces mimicking them
APS March Meeting 2014, Denver, USA, 3-7 March 2014

Poster (Refereed & Invited), Ko Okumura
“Simple views on the dynamics of fluids in confined space”
Dynamics at Interfaces, OIST, Okinawa, JAPAN, 9-13 JUN 2014

Poster (Refereed & Invited), Marie Tani, Daisuke Ishii, Shuto Ito, Takahiro Hariyama, Masatsugu Shimomura and Ko Okumura “Imbibition dynamics on surfaces of legs of a small animal and on artificial surfaces mimicking them”
Dynamics at Interfaces, OIST, Okinawa, JAPAN, 9-13 JUN 2014

Poster (Refereed & Invited), Mayuko Murano, Natsuki Kimoto and Ko Okumura “Bursting of a bubble confined in between two plates”
Dynamics at Interfaces, OIST, Okinawa, JAPAN, 9-13 JUN 2014

2013

Invited Talk, Ko Okumura
Scaling laws for wetting: dynamics of wicking, liquid drops and bubbles
2nd Soft-interfaces Mini-symposium 2013 (SIMS2013)
-Physical Chemistry and Characterization of Soft-interfaces-
March 13 (Wed)-15(Fri); Fukuoka, Japan

Selected Oral, Ko Okumura
Simple views on the dynamics of fluids in confined space
XXV IUPAP International Conference on Statistical Physics (STATPHYS25)
22-26 July, 2013, Seoul, Korea

Invited talk, Ko Okumura
Strength and Toughness of Helical Fusion Materials Inspired by the Exoskeleton of Lobsters
2nd Special Fusion Materials Meeting, in honor of the visit of Nico Sommerdijk & Fiona Meldrum
The Univ. of Tokyo, 27-28 Oct 2013

Invited talk, Ko Okumura
Scaling views on the strength of biocomposites
Workshop on high-toughness materials (organized by RIKEN)
September 4, 2013, Tokyo Univ. (Hongo)

Seminar, Ko Okumura,
Scaling laws for wetting: dynamics of wicking, liquid drops and bubbles
Prof. Ho-Young Kim’ group seminar
Seoul National University
July 24, 2013, Seoul, Korea

*Oral Presentation, Yuka Takehara, Jennifer Rieser, Jerry Gollub, Douglas Durian
Dynamics of failure in 2d granular packings
APS March Meeting 2013, Baltimore, USA, 20 March 2013

*Oral Presentation, Jennifer Rieser, Yuka Takehara, Wenbin Li, Ju Li, Jerry Gollub, Douglas Durian
Compression of granular pillars with constant width at top and bottom
APS March Meeting 2013, Baltimore, USA, 22 March 2013

* presentations by members of our group

XXV IUPAP International Conference on Statistical Physics (STATPHYS25)
22-26 July, 2013, Seoul, Korea
(1) Poster, Maria Yokota and Ko Okumura
Coalescence of viscous drops in quasi two-dimensional space
(2) Poster, Yuka Takehara and Ko Okumura
High-velocity granular friction near the jamming point
(3) Poster, Marie Tani, Ko Okumura, Ryuji Kawano and Shoji Takeuchi
Imbibition of Micro-patterned Surfaces

2012

Invited Talk, Ko Okumura,
Simple views on drops, bubbles and spider webs
The 5th Series of WPI-AIMR Joint Seminar
WPI-AIMR, Tohoku Univ, June 29, 2012

Seminar, Ko Okumura,
Simple views on drops, bubbles and spider webs
Prof. H. Caps’ group seminar
Univ. of Liege
5 April 2012, Liege, Belgium

Invited Talk, Ko Okumura,
Simple views on the mechanical adaptability of spider webs and the rupture dynamics of polymer thin films
2012 Conference on Deformation, Yield and Fracture in Polymers
Rolduc Abbey in Kerkrade, NL, April 1-5, 2012

Invited Talk, Ko Okumura,
Impressionist approach to physics of wetting and material toughness
12th International Symposium on Biomimetic Materials Processing (BMMP-11)
24 — 27 January 2012, Nagoya, Japan

Oral presentation, Ko Okumura
Simple views on bioinspired materials: wetting and toughness
Special Fusion Materials Meeting, in honor of the visit of Joanna & Michael Aizenberg
The Univ. of Tokyo, 8 Oct 2012

Seminar, Ko Okumura,
Simple views on drops, bubbles and spider webs
Prof. L. Limat’s group seminar
Laboratoire Matière et Systèmes Complexes
Universite Paris VII (Paris Diderot)
23 Feb 2012, Paris, France

Seminar, Ko Okumura,
Simple views on drops, bubbles and spider webs
DOLFIN-II Science Team Meeting
ESTEC, European Space Agency
20-21 Feb 2012, Noordwijk, Netherlands

Oral Presentation, Ko Okumura,
Scaling laws for the imbibition of textured surfaces comprising short pillars with rounded edges
65th Annual Meeting of the APS Division of Fluid Dynamics
November 18–20, 2012; San Diego, California

Poster Presentation, Yokota Maria and Ko Okumura, Dimensional crossover in the viscous dynamics of coalescence of liquid drops confined in between two plates, “Soft Interfaces,” Ecole de Physique des Houches, July 2 – July 27 2012, Les Houches, France

Poster Presentation, Yuka Takehara and Ko Okumura,
High-velocity drag friction in dense granular media
Gordon Research Conference Granular & Granular-Fluid Flow Meeting
Davidson, NC, USA, 22-27 July 2012

2011

Seminar, Ko Okumura,
Quasi two-dimensional dynamics of drops and bubbles: drag friction, film bursting, and coalescence
LPS group seminar, Univ. Paris-Sud, Orsay (hosted by Prof. L. Leger)
December 16, 2011

Seminar, Ko Okumura,
Dynamics of drops and bubbles in a confined space
INSP, University Paris 6 (hosted by Prof. S. Cohen-Addad)
December 12, 2011

Seminar, Ko Okumura,
Simple model of spider webs and scaling dynamics of drops and bubbles
Condensed Matter Seminar (hosted by Prof. Durian)
Pennsylvania University, November 16, 2011

Seminar, Ko Okumura,
Scaling dynamics of drops and bubbles and simple model of spider webs
Widely Applied Mathematics Seminar (hosted by Prof. Mahadevan)
Harvard University, November 15, 2011

Invited Talk, Ko Okumura,
Capability of Impressionist Physics in Materials Science: Liquid Drops, Spider Webs and Nacre
The 1st International Symposium on Fusion Materials
Toba, Aichi, Japan, October 16-18, 2011

Invited Talk, Ko Okumura,
Wetting on textured surfaces and dynamics of liquid drops and bubbles
The 3rd Asian Symposium on Advanced Materials– Chemistry & Physics of Functional Materials – (ASAM-3),
Fukuoka, Japan, September 19 — 22, 2011

Invited Lecture, Ko Okumura,
Toughening materials by combination of soft and hard elements: examples from nacre to spider webs
EUROMAT 2011 Congress, Montpellier, France September 12 — 15, 2011

Institute Colloquium
, Ko Okumura,
Mechanical adaptability of spider webs and drag frictions in two dimensions
Prof. S. Herminghaus gr., Max-Planck Institute, Goettingen, Germany, September 12, 2011

Invited Talk, Ko Okumura,
Bubbles and drops, parabolic-flight experiments and other research interests
PolaDrop topical team meeting
March 8, 2011, ESA Headquarter, Paris

Invited Talk, Ko Okumura,
Drops and bubbles, spider webs, granular materials, and parabolic-flight experiments
FOAM-C instrument utilization meeting
17 — 18 February 2011, ESA Headquarter, Paris

Invited Talk, Ko Okumura,
Wetting on artificial lotus surfaces
11th International Symposium on Biomimetic Materials Processing (BMMP-11)
25 — 28 January 2011, Nagoya, Japan

Oral, Maria Yokota and Ko Okumura,
Dimensional crossover in the viscous dynamics of coalescence of liquid drops confined in between two plates
64nd Annual Meeting of the APS Division of Fluid Dynamics November 20–22, 2011; Baltimore, Maryland

Oral, Yuka Takehara and Ko Okumura,
High-velocity drag friction in dense granular media
64nd Annual Meeting of the APS Division of Fluid Dynamics November 20–22, 2011; Baltimore, Maryland

The 5th Mini-Symposium on Liquids (MSL2011)
Physics and Chemistry of Soft Interfaces
June 25, 2011, Okayama University
(1) Poster, Y. Aoyanagi and K. Okumura
Simple Model for Mechanics of Spider Webs
(2) Poster, A. Eri and K. Okumura
Dynamics of drops and bubbles in a Hele-Shaw cell
(3) Poster, Y. Hamamoto and K. Okumura
Analytical Studies on a Crack in Simplified Nacre Model
(4) Poster, N. Obara and K. Okumura
Universal scaling law for the imbibition of textured surfaces with “soft” edges
(5) Poster, T. Sekiguchi, M. Tani and K. Okumura
Experimental study on the Brazil nut effect
(6) Poster, N. Takahashi and K. Okumura
On the stress concentration in a simple elastic-plastic model
(7) Poster, Y. Takehara and K. Okumura
High-velocity drag friction in dense granular media
(8) Poster, M. Tani, T. Sekiguchi and K. Okumura
Imbibition of inhomogeneous textured surfaces

Poster, Y. Yoshitake and K. Okumura
Contact angle hysteresis on rough and inhomogeneous surfaces
11th International Symposium on Biomimetic Materials Processing (BMMP-11)
25 — 28 January 2011, Nagoya, Japan

Poster, Y. Aoyanagi and K. Okumura
11th International Symposium on Biomimetic Materials Processing (BMMP-11)
25 — 28 January 2011, Nagoya, Japan

Poster, A. Eri and K. Okumura
Bursting of a thin film in a confined geometry: Rimless and constant-velocity dewetting
11th International Symposium on Biomimetic Materials Processing (BMMP-11)
25 — 28 January 2011, Nagoya, Japan

Poster, M. Yokota and K. Okumura
Coalescence of a viscous drop confined in between two plates
11th International Symposium on Biomimetic Materials Processing (BMMP-11)
25 — 28 January 2011, Nagoya, Japan

Poster, Y. Hamamoto and K. Okumura
Analytical Studies on a Crack in Layered Structures Mimicking Nacre
11th International Symposium on Biomimetic Materials Processing (BMMP-11)
25 — 28 January 2011, Nagoya, Japan

2010

Invited Plenary Talk, Ko Okumura,
Toughness of soft-hard composites and Wetting on Textured Substrates
the Spring annual meeting of the Materials Research Society – Korea (MRS-K)
May 13-14(13) 2010, Palace Hotel in Samcheok City, Korea

Invited Talk, Ko Okumura,
Fracture of Network Systems and Liquid Films on Textured Substrates
10th International Symposium on Biomimetic Materials Processing (BMMP-10)
26 — 29 (27) January 2010, Nagoya, Japan

Seminar, Ko Okumura
Simple views on fracture of familiar materials: sea shells, spider webs and plastic bags
December 13, 2010, Institut Curie, Pairs

Seminar, Ko Okumura
Dynamics of two-dimensional bubbles and drops and a simple scaling in nonlinear fracture
December 17, 2010, PMMH, ESPCI, Pairs

Seminar, Ko Okumura
Spin coating on textured surfaces and nonlinear extension of the Griffith formula
February 19, 2010, LPS group seminar, Univ. Paris-Sud, Orsay
http://www.lps.u-psud.fr/spip.php?rubrique211&lang=fr

Seminar, Ko Okumura
Spin coating on textured surfaces and nonlinear extension of the Griffith formula
February 17, 2010, Brochard’s group seminar, Institut Curie, Pairs

Poster, A. Eri and K. Okumura
Lifetime of a two-dimensional air bubble
International Soft Matter Conference 2010
5th-8th July 2010, Granada, Spain

Poster, Y. Yoshitake and K. Okumura
Effect of Surface Roughness on Contact Angle Hysteresis
10th International Symposium on Biomimetic Materials Processing (BMMP-10)
26 — 29 (26) January 2010, Nagoya, Japan

Poster, A. Eri and K. Okumura
Rising and Setting of a Fluid Drop in a Hele-Shaw Cell
10th International Symposium on Biomimetic Materials Processing (BMMP-10)
26 — 29 (26) January 2010, Nagoya, Japan

2009

Invited Talk, Ko Okumura,
Mathematical Modeling and Crack Solution to a Layered Structure Mimicking nacre; Griffith’s Failure Formula for Nonlinear Elastic-plastic Materials and its Implication for Structured Materials
the European Congress and Exhibition on Advanced Materials and Processes,
September 7 -10, 2009, Glasgow, UK.

Invited Talk, Ko Okumura,
Importance of soft-hard combination on nanoscale in tough biocomposites: Lessons from a layered structure mimicking nacre
9th International Symposium on Biomimetic Materials Processing(BMMP-9)
20 — 23 January 2009, Nagoya, Japan

Seminar, Ko Okumura,
Drag friction in two dimensional granular medium and on a moving liquid film and its instability on textured surfaces
November 16, 2009, LPMDI group seminar, Université Paris-Est, Marene la Valle

Seminar, Ko Okumura,
Wetting on textured surfaces
November 13, 2009, Prof. N. Vandewalle’s group seminar, Liege.

Seminar, Ko Okumura
Drag friction in two-dimensional polydisperse granular media
Cofee seminar of PMMH,
November 5, 2009, ESPCI, Paris

Seminar, Ko Okumura,
Recent works on wetting possibly related to FOAM
FOAMs projects meeting
November 3, 2009, European Space Agence Headquarters, Paris

Oral, Ko Okumura, Ayako Eri and Maria Yokota
Dynamics of bubbles and drops in a Hele-Shaw cell
62nd Annual Meeting of the APS Division of Fluid Dynamics November 22–24, 2009; Minneapolis, Minnesota EH.00010

Plenary oral plus poster, Ko Okumura
Fate of two-dimensional bubbles and fracture of soft polymer foam solids
de Gennes Discussion Conference: From reptation to glassy materials: de Gennes pionneering work in rheology and recent developments, February, 2-5, 2009, Chamonix, France

Poster, Yumiko Yoshitaka and Ko Okumura
On the origin of contact angle hysteresis
62nd Annual Meeting of the APS Division of Fluid Dynamics November 22–24, 2009; Minneapolis, Minnesota L1.00025

Plenary oral plus poster, Yumiko Yoshitake and Ko Okumura
On the origin of contact angle hysteresis on textured surfaces
The 3rd Mini-Symposium on Liquids (MSL2009)
Physics and Chemistry of Soft Interfaces
June 20, 2009, Okayama University

Plenary oral plus poster, Ayako Eri and Ko Okumura
Rising of a two-dimensional bubble
The 3rd Mini-Symposium on Liquids (MSL2009)
Physics and Chemistry of Soft Interfaces
June 20, 2009, Okayama University

Plenary oral plus poster, Maria Yokota and Ko Okumura
Coalescence of a two-dimensional liquid drop to a liquid bath
The 3rd Mini-Symposium on Liquids (MSL2009)
Physics and Chemistry of Soft Interfaces
June 20, 2009, Okayama University

Poster, Yumiko Yoshitake and Ko Okumura,
Contact Angle Hysteresis on Textured Surfaces
9th International Symposium on Biomimetic Materials
Processing(BMMP-9)
20 — 23 January 2009, Nagoya, Japan

Poster, Ayako Eri and Ko Okumura,
Lifetime of a Two-Dimensional Air Bubble
9th International Symposium on Biomimetic Materials
Processing(BMMP-9)
20 — 23 January 2009, Nagoya, Japan

2008

Invited Lecture, Ko Okumura,
Fracture of structured materials
— Impressionistic views on fracture of composites and polymer foam —
8th World Congress on Computational Mechanics
30 June to 5 July 2008, in Venice, Italy

Invited Talk, Ko Okumura,
Wetting on rough surfaces
The 17th World Interfinish Congress
June 16-18, 2008 in Busan, Korea

Invited Lecture, Ko Okumura,
Fracture of structured materials
ECCOMAS Multidisciplinary Jubilee Symposium – New Computational Challenges in Materials, Structures, and Fluids
February 18 to 20, 2008, in Vienna, Austria

Invited Lecture, Ko Okumura,
Fracture of structured materials and wetting on rough surfaces
8th International Symposium on Biomimetic Materials
Processing(BMMP-8)
21 — 24 January 2008, in Nagoya, Japan

Seminar, Ko Okumura
Lifetime of a two-dimensional bubble, wetting on textured surfaces, and fracture of structured materials
Prof. M. Adler’s gr., Laboratoire de Physique des Matériaux Divisés et des Interfaces, Université Paris – Est, Nobemver 21, 2008

Seminar, Ko Okumura
Lifetime of a two-dimensional bubble, wetting on textured surfaces, and fracture of structured materials
Prof. F. Brochard gr.,  Institut Curie – Centre de Recherche, Paris, May 13, 2008 Web

Seminar, Ko Okumura
Lifetime of a two-dimensional bubble, wetting on textured surfaces, and fracture of structured materials
Prof. L. Leger gr.,  Laboratoire de physique des solides, Orsay, May 19, 2008 Web

Seminar
, Ko Okumura
Lifetime of a two-dimensional bubble, wetting on textured surfaces, and fracture of structured materials
Prof. S. Dietrich gr., Max-Planck Institute, Stuttgart, Germany, February 22, 2008

Seminar, Ko Okumura
Lifetime of a two-dimensional bubble, wetting on textured surfaces, and fracture of structured materials
Prof. S. Herminghaus gr., Max-Planck Institute, Goettingen, Germany, February 23, 2008

Poster,
Yuko AOYANAGI and Ko OKUMURA
Reinforcement of a material exploiting its internal structure
International Symposium on Non-Equilibrium Soft Matter
2-5 June 2008, Kyoto, Japan

Poster,
Ayako ERI and Ko OKUMURA
Lifetime of a two-dimensional air bubble
International Symposium on Non-Equilibrium Soft Matter
2-5 June 2008, Kyoto, Japan

Poster,
Yuko AOYANAGI, Yumi Shiina and Ko OKUMURA
Reinforcement of a material exploiting its internal structure
International Workshop on Bio-Soft Matter
9-10 June 2008, Tokyo, Japan

Poster, Ayako ERI and Ko OKUMURA
Lifetime of a two-dimensional air bubble
International Workshop on Bio-Soft Matter
9-10 June 2008, Tokyo, Japan

2007

Invited Lecture, Ko Okumura,
Analytical solution of crack problems in nacre,
6th International Congress on Industrial and Applied Mathematics 2007″
(ICIAM 2007) in Zurich,
Switzerland, July 16 — 20, 2007

Invited Lecture, Ko Okumura,
Wetting on textured surfaces and fate of a two-dimensional bubble,
International mini-symposium on liquids (in honor of Prof. B. Widom)
May 11, 2007, Okayama, Japan

Invited Lecture, Ko Okumura,
Impressionistic views on fracture of composites and polymer foam
International Conference on Polymer Processing (ICPP – 2007): May 18 – 20, 2007, Beijing, China
CANCELED

Poster, Ko Okumura
Fracture, wetting, and polymer statistics
Statphys 23, July 9-13, 2007, Genova, Italy

Memorial talk, Ko Okumura
My memories of PGG (Pierre-Gilles de Gennes)
New Frontiers in Colloidal Physics: A Bridge between Micro- and Macroscopic Concepts in Soft Matter
July 25-27, 2007, Kyodai Kaikan (Kyoto, Japan)

Poster, Chieko Ishino and Ko Okumura
Wetting transitions on textured surfaces
New Frontiers in Colloidal Physics: A Bridge between Micro- and Macroscopic Concepts in Soft Matter
July 25-27, 2007, Kyodai Kaikan (Kyoto, Japan)

Poster, Ayako Eri and Ko Okumura
Fate of a two-dimensional bubble
New Frontiers in Colloidal Physics: A Bridge between Micro- and Macroscopic Concepts in Soft Matter
July 25-27, 2007, Kyodai Kaikan (Kyoto, Japan)

Poster, Yumi Shiina, Yukari Hamamoto and Ko Okumura
Fracture of soft cellular solids

New Frontiers in Colloidal Physics: A Bridge between Micro- and Macroscopic Concepts in Soft Matter
July 25-27, 2007, Kyodai Kaikan (Kyoto, Japan)

Selected Oral, Mathilde Reyssat, Chieko Ishino, Etienne Reyssat, Ko Okumura and David Quere, Wicking within forests of micro-pillars, 60th Annual Meeting of the Divison of Fluid Dynamics, November 18–20, 2007; Salt Lake City, Utah

2006

Invited Lecture, Ko Okumura,
SCALING VIEWS ON STRENGTH OF SOFT/HARD COMPOSITES,
III European Conference
on Computational Solid and Structural Mechanics
Lisbon, Portugal, 5 – 8 June 2006

Poster, Chieko Ishino and Ko Okumura
Wetting transitions on textured surfaces
International Workshop on
Recent Advances in Soft Matter Physics
Institute of Industrial Science, The University of Tokyo
August 21 – 23, 2006

Poster, Kyoko KAWAI and Ko OKUMURA, Correlation of a polymer chain with the ends fixed
International Workshop on
Recent Advances in Soft Matter Physics
Institute of Industrial Science, The University of Tokyo
August 21 – 23, 2006

Poster, Ko OKUMURA
Fracture of pearl’s layered structure, double network gel
and shock-absorbing foam
International Workshop on
Recent Advances in Soft Matter Physics
Institute of Industrial Science, The University of Tokyo
August 21 – 23, 2006

Poster, Ko Okumura,
Fracture of pearl’s layered structure, double network gel and shock-absorbing foam
Frontiers in Dynamics: Physical and Biological Systems
Univ. Tokyo, 22 – 24 May 2006

2005

Seminar, Ko Okumura,
Scaling views on toughness of composite materials,
Prof. Gordon Williams gr., Imperial College, September, 2005

Seminar, Ko Okumura,
Scaling views on toughness of composite materials,
Prof. Julian V. F. Vincent gr., Univ. of Bath, September 26, 2005

Selected Oral Talk,  Ko Okumura,
Phase transitions of liquid crystal systems,
International Liquid Crystal Elastomer Conference 2005,
Cambridge Univ., September 21-24, 2005

Seminar, Ko Okumura,
Wetting on rough surfaces,
Prof. Julia Yeomans gr., Oxford Univ., September 20, 2005

Keynote talk, Ko Okumura,
Fracture strength of biomimetic nano composite materials: a blend of soft and hard elements,
International Conference on Advances in Polymer Blends, Composites, IPNS and gels: Macro to Nano Scale, March 21-23, 2005 (Cochin, India).

Invited Talk, Ko Okumura,
Two stories from soft matter physics in the biomimetic context : fracture strength of composite materials and wetting transitions on textured surfaces,
Fifth International Symposium on Biomimetic Materials Processing, January 26-28, 2005 (Nagoya, Japan).

2004

Invited talk, Ko Okumura,
Scaling Views on Toughness of Composite Materials,
Sixth World Congress on Computational Mechanics, September 5-10, 2004 (Beijing, China).

Selected oral talk, Ko Okumura,
Toughness and fracture of biomimetic composites,
International Workshop on Physics of Soft Matter Complexes, November 29-December 2, 2004 (Tokyo, Japan).

Selected oral talk, Ko Okumura,
Toughness and fracture of gel composites
MACRO2004, 40th IUPAC World Polymer Congress, July 4-9, 2004 (Paris, France).

Seminar, K. Okumura,
Wetting transitions on rough surfaces,
Informal discussions on problems related to wetting (Satellite meeting of International Workshop on Dynamics of Complex Fluids, March 11, 2004, Yukawa Institute, Kyoto University, Japan).

Seminar, K. Okumura,
Rebounds of water drops and gel balls,
Prof. Ajdari’s group, LABORATOIRE DE PHYSICO-CHIMIE THÉORIQUE, ENPCI (Paris, France), January 13, 2004

Seminar, K. Okumura,
Toughness of composite materials: nacre-like biomimetic structure and double network gels,
Soft matter group seminar (Prof. Brochard-Wyart), Institut Curie (Paris, France), January 12, 2004.

Seminar, K. Okumura
Wetting transitions on rough surfaces,
Prof. de Gennes’ group seminar, College de France (Paris, France), January 9, 2004

Poster, K. Okumura,
Toughness of double network gels
International Workshop on Dynamics of Complex Fluids (March 8-10, 2004, Yukawa Institute, Kyoto University, Japan)

Poster, C. Ishino, K. Okumura and D. Quéré
Phase diagram of wetting on rough surfaces
International Workshop on Dynamics of Complex Fluids, (March 8-10, 2004, Yukawa Institute, Kyoto University, Japan)

Poster, N. Sato and K. Okumura
Systematic inclusion of correlation effects into the Maier-Saupe theory by the inversion method
International Workshop on Dynamics of Complex Fluids (March 8-10, 2004, Yukawa Institute, Kyoto University, Japan)

Poster, C. Ishino, K. Okumura and D. Quéré
Wetting transitions on rough surfaces
International Workshop on Physics of Soft Matter Complexes, November 29-December 2, 2004 (Tokyo, Japan).

Poster, N. Sato and K. Okumura
Systematic inclusion of correlation effects into the Maier-Saupe theory by the inversion method
International Workshop on Physics of Soft Matter Complexes, November 29-December 2, 2004 (Tokyo, Japan).

2003

Selected oral talk, K. Okumura and P.-G. de Gennes,
Phase Transitions of Nematic Rubbers,
Slow Dynamics in Complex Systems (Institute of Fluid Science, Tohoku Univ., Nov. 3-8, 2003, Sendai, Japan)

Selected oral talk, K. Okumura,
Fractures in biomimetic layered structures: elastic and viscoelastic viewpoints,
the 1st International Congress on Bio-nanointerface (May19-24, 2003, Arcadia Ichigaya, Tokyo)

Invited talk, K. Okumura,
Fractures in biomimetic layered structures,
Workshop on Soft Matter Physics (March 10, 2003, Ochanomizu University, Tokyo).

Seminar, K. Okumura,
Fractures in biomimetic layered structures,
Soft matter group seminar at CRPP (2003.2.3 , Bordeaux, France).

Seminar, K. Okumura,
Fractures in biomimetic layered structures,
Prof. J. Duran’s group, University of Paris VI (2003.1.31 , Paris, France).

Seminar, K. Okumura,
Fractures in biomimetic layered structures,
Prof. de Gennes’ group seminar, College de France (2003.1.24 , Paris, France)

Seminar, K. Okumura,
Rebounds of water drops and gel balls,
Institute Curie (2003.2.19 , Paris, France).

Pierre-Gilles de Gennes and Ko Okumura“Phase transitions of nematic rubbers,” the 2nd France-Japan Workshop (Structure, deformation and stimuli response of polymer  gels – Visco-elastic responsive materials : Theory, Experiments and Applications, 5 – 8 November 2003, Centre de Recherche Paul Pascal, Pessac – France).

Yoshimi Tanaka and Ko Okumura, “Impact and deformation of gel balls,” the 2nd France-Japan Workshop (Structure, deformation and stimuli response of polymer  gels – Visco-elastic responsive materials : Theory, Experiments and Applications, 5 – 8 November 2003, Centre de Recherche Paul Pascal, Pessac – France).

Oral Talk, K. Okumura and P.-G. de Gennes
Phase Transitions of Nematic Rubbers
English session of JPS meeting (Okayama, 20pZC-2).

Oral talk, K. Okumura
Rebounds of water drops and gel balls
1st International Symposium on New Developments of Integrated Sciences (Ochanomizu Univ., Tokyo).

 

Before 2003

Invited Talk, K. Okumura,
Possibilities of Multi-dimensional Laser Spectroscopy and Two Stories from Soft Matter Physics, The 3rd Joint Forum of Ewha Womans Univ., Japan Women’s Univ., and Ochanomizu Univ. and Research in Science for Women in the 21st Century (Nov. 8-10, 2001, Ochanomizu Univ., Tokyo).

Invited Talk, K. Okumura,
Brownian Theory of Nonlinear Raman Response of Liquid,
The 61st Okazaki Conference on “Liquid Dynamics Studied by Time-Resolved Vibrational Spectroscopy” (Institute for Molecular Science, January 21-23, 1998).

International group seminars before 2000

□ Prof. de Gennes’ group seminar, College de France (Paris).
□ Prof. Shaul Mukamel’s group, University of Rochester, a few times
□ Prof. Graham R. Fleming’s group, University of Chicago, twice
□ Prof. Charles A. Schmuttenmaer’s group, Yale University
□ Prof. B. Sakita’s, City College of City Univ. of New York
□ Prof. Peter Wolynes’ and Nancy Makri’s groups, Univ. of Illinois, Urbana-Champaign, twice
□ Prof. A. Leggett’s group, Univ. of Illinois, Urbana-Champaign