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International Conference (Invited)

(11) Equivariant cohomology of a certain class of torus orbifolds: 7th East Asian Conference on Algebraic Topology (EACAT7), The Indian Institute of Science Education and Research (IISER) (Mohali in India), December 1st, 2017. (invited)

(10) Extended actions of quasitoric manifolds and J-constructions of polytopes: The Princeton-Rider Workshop on the Homotopy Theory of Polyhedral Products, Princeton University and Rider University (Princeton in US), May 31st, 2017. (invited) (slides)

(9) On a maximal torus which acts on a GKM-manifold: International conference «Toric Topology, Number Theory and Applications» Pacific National University (Khabarovsk in Russia), September 8th, 2015. (plenary)

(8) On a maximal dimension of the torus which acts on a GKM-manifold effectively: Combinatorial Constructions in Topology UNIVERSITY OF REGINA (Regina in Canada), August 20th, 2015.

(7) A necessary and sufficient condition for the extension of an axial function of GKM graph: Torus Actions in Geometry, Topology, and Applications, the Skolkovo Institute of Science and Technology (Skoltech) (Moscow in Russia), February 20th, 2015. (invited) (slides)

(6) A class of torus manifolds which is determined by equivariant cohomology: International Open Chinese-Russian conference Torus Actions: Topology, Geometry and Number Theory, Pacific National University (Khabarovsk in Russia), September 2nd, 2013. (invited) (slides)

(5) Root systems of torus graphs and stably complex structure of torus manifolds: Special session "Toric geometry and topology" in Mathematical Congress of the Americas, Convention Center and State Auditorium (Guanajuato in Mexico), August 8th, 2013. (invited)

(4) Rigidity problems in toric topology: Symposium on Geometry of Manifolds and Group Actions, Gdansk University of Technology (Gdansk in Poland), September 6th, 2012. (plenary) (slides)

(3) Topology of low dimensional CP towers: International Conference, Toric Topology and Automorphic Functions, Pacific National University (Khabarovsk in Russia), September 5th, 2011. (invited) (slides)

(2) On the cohomological rigidity of toric hyperKahler manifolds: GEOMETRY, TOPOLOGY, ALGEBRA, and APPLICATIONS dedicated to the 120th anniversary of Boris Delone, Steklov Mathematical Institute (Moscow in Russia), August 16th, 2010. (invited) (slides)

(1) On projective bundles over small covers: BRATISLAVA TOPOLOGY SYMPOSIUM "Group Actions and Homogeneous Spaces"., Comenius University (Bratislava in Slovakia), September 8th, 2009. (invited) (slides)


International Conference

(13) A remark on root systems and J-constructions of quasitoric manifolds: Toric Topology 2016 in Kagoshima Kagoshima University (Kagoshima in Japan) April 21st, 2016.

(12) An obstruction to the extension of a torus action on a GKM manifold: Glances at Manifolds, the Jagiellonian University (Krakow in Poland) July 19th, 2015. (slides)

(11) On extended actions of complexity one torus manifolds: Toric Topology 2015 in Osaka, Osaka City University (Osaka in Japan), June 19th, 2015.

(10) Complexity one GKM graph with symmetries and an obstruction to be a torus graph: TOPOLOGY OF TORUS ACTIONS AND APPLICATIONS TO GEOMETRY AND COMBINATORICS, Daejeon Convention Center(DCC) (Daejeon in Korea), August 10th, 2014. (slides)

(9) On classification of locally standard torus manifolds up to equivariant diffeomorphism: Toric Topology 2014 in Osaka, Osaka City University (Osaka in Japan), January 22nd, 2014.

(--) (invited talk by DongYoup Suh) Cohomological rigidity of CP-towers: PRIMA 2013 Shanghai Jiao Tong University (Shanghai in China), June 25th, 2013.

(--) (plenary talk by DongYoup Suh) Classification of complex projective towers up to dimension 8 and cohomological rigidity: Algebraic Topology and Abelian Functions Moscow State University (Moscow in Russia), June 19th, 2013.

(8) Infrasolv real moment-angle manifolds: Toric Topology 2011 in Osaka, Osaka City University (Osaka in Japan), November 29th, 2011.

(7) GKM graphs induced by GKM manifolds with SU(l+1)-symmetries: Group Actions in Topology and Analysis - 4th GAF Conference, Milan 2010, University of Milano-Bicocca (Milan in Italy), September 16th, 2010. (slides)

(6) (short communication) On cohomological rigidity of toric hyperKahler manifolds: International Congress of Mathematicians Hyderabad International Convention Center (Hyderabad in India), August 22nd, 2010. (slides)

(5) (poster talk) Classification of codimension 1 extended G-actions on torus manioflds: New Horizons in Toric Topology., University of Manchester (Manchester in United Kingdom), July 7th--11th, 2008. (poster)

(4) GKM-graphs and its equivariant cohomology: Groups in Geometry and Topology, GGT Malaga 06., University of Malaga (Malaga in Spain), September 6th, 2006.

(3) Hypertorus graph and its equivariant cohomology: International conference on Toric Topology., Osaka City University (Osaka in Japan), May 29th, 2006.

(2) On the action of SL(3,R) on S^{4}: International Conference: Geometric topology, discrete geometry and set theory., Moscow State University (Moscow in Russia), August 24th, 2004.

(1) SL(m,H)\times SL(n,H)-action on S^{4(m+n)-1}: 3rd Poznan Workshop on Transformation Groups., Adam Mickiewicz University (Poznan in Poland), August 12th, 2003.


Seminar (more than two days), Conference, Workshop

(39) Flag Bott manifolds and the toric closure of generic orbit associated to a generalized Bott manifold: The 44th Symposium on Transformation Groups, Fukui Phoenix Plaza (Fukuin in Japan), November 16th 2017. (invited)

(38) GKM manifold and GKM graph (1), (2): Algebraic and Geometric Models for Spaces and Related Topics 2017, Shinshu University (Nagano in Japan), September 5th and 6th 2017. (invited, 2 talks)

(37) On flagged Bott manifolds: Young Researchers in Homotopy Theory and Toric Topology, Kyoto University (Kyoto in Japan), August 5th 2017. (invited)

(36) Quasitoric manifolds, root systems and J-constructions of polytopes: Algebraic Topology focused on Transformation Groups, RIMS (Kyoto in Japan), May 24th 2017. (invited) (Japanese)

(35) A partial classification of complexity one GKM manifolds with large symmetries: Group actions and topology, Kinosaki health and welfare center (Hyogo in Japan), December 5th 2016. (invited) (Japanese)

(34) Cohomological non-rigidity of eight-dimensional complex projective towers: MSJ Autumn Meeting 2016, Kansai University (Osaka in Japan), September 17th 2016. (Japanese) (slides)

(33) Flagified Bott manifolds and their maximal torus actions: New transformation group theory and related topics, RIMS (Kyoto in Japan), May 24th 2016. (Japanese)

(32) On a maximal torus which acts on a GKM-manifold: Foliations and Groups of Diffeomorphisms 2015, Tambara Institute of Mathematical Sciences The University of Tokyo (Gunma in Japan), October 30th 2015.

(31) Topics from Toric Topology: Small workshop ``Around infinite groups and geometry'' Tambara Institute of Mathematical Sciences The University of Tokyo (Gunma in Japan), July 11th 2015. (Japanese)

(30) Root systems and symmetries of torus manifolds: Algebraic structures in combinatorics and geometry, RIMS (Kyoto in Japan), June 12th 2015. (invited) (Japanese)

(29) A remark on torus graphs with root systems: New topics on transformation groups, RIMS (Kyoto in Japan), May 26th 2015.

(28) A necessary and sufficient condition for the extension of an axial function of GKM graph, Special evening session of Geometry and Topology, A conference in honor of Martin Bendersky's seventieth birthday and in commemoration of our friend and colleague Sam Gitler , Princeton University (Princeton in US), March 19th 2015 (invited).

(27) Cohomological rigidity and non-rigidity of CP-towers, The 2nd Korea Toric Topology Winter Workshop, The educational institue of Jeju university (Jeju Unipark) (Jeju Island in Korea), December 27th 2014 (invited). (slides)

(26) On the extension of torus actions on GKM manifolds: The 41st Symposium on Transformation Groups, Gamagori civic hall (Aichi in Japan), November 14th 2014 (invited). (slides)

(25) Toric Topology --Topology and Combinatorics--: The meeting for the outreach of ``New developments in infinite groups and geometry'' Tambara Institute of Mathematical Sciences The University of Tokyo (Gunma in Japan), June 7th 2014 (invited) (Japanese).

(24) On complexity one GKM graphs with symmetries: The Topology and the Algebraic Structures of Transformation Groups , RIMS (Kyoto in Japan), May 29th 2014 (invited).

(23) On classifications of a certain class of 6-dimensional torus manifolds: The 40th Symposium on Transformation Groups, Meiji University (Tokyo in Japan), December 6th 2013. (slides)

(22) Root systems of torus graphs and extended actions of torus manifolds: The 39th Symposium on Transformation Groups, Tokyo University of Science (Tokyo in Japan), November 23rd 2012. (invited) (slides)

(21) On classification of certain 8-dimensional torus manifolds: The 38th Symposium on Transformation Groups, Hyogo Prefecture Citizens' Hall (Hyogo in Japan), November 18th, 2011. (slides)

(20) On group actions with codimension one orbits: The 57th Topology Symposium, Santa Hall (Okayama in Japan), August 12th, 2010. (invited) (slides)

(19) Towards a definition of root systems of GKM graphs: Workshop on Toric Topology and Related Topics, Fudan University (Shanghai in China), May 3rd, 2010. (invited)

(18) Equivariant cohomological and cohomological rigidity of toric hyperKahler manifolds: Ikuta Seminar on Symplectic Geometry and Toric Topology, Meiji University (Ikuta in Japan), March 6th, 2010. (invited)

(17) Equivariant cohomological and cohomological rigidity of toric hyperKahler manifolds: The 8th KAIST Geometric Topology Fair, KAIST (Daejeon in Korea), January 12th, 2010. (slides)

(16) On projective bundles over small covers: The 36th symposium on Transformation group theory, Osaka City University (Osaka in Japan), December 10th, 2009. (slides)

(15) Equivariant cohomology determines hypertoric manifold (Revised): Toric Topology Seminar in Osaka 2009, Osaka City University (Osaka in Japan), December 7th, 2009.

(14) Equivariant cohomology determines hypertoric manifold: New Evolution of Transformation Group Theory, RIMS (Kyoto in Japan), August 19th, 2009.

(13) Topological types of some torus manifolds: KMS 2009 Spring Conference, Ajou University (Suwon in Korea), April 25th, 2009. (slides)

(12) Remarks on McGavran's paper and Nishimura's results, Toric Topology Workshop, KAIST 2008, Korea Advanced Institute of Science and Technology (Daejeon in Korea), June 10th, 2008.

(11) Classification of compact group actions on torus manifolds which have codimension 0 or 1 orbits: Osaka City University Summer School on Symplectic Geometry and Toric Topology, Osaka City University (Osaka in Japan), July 23rd, 2007.

(10) On 8-dimensional manifolds with SU(3)-actions: The theory of transformation groups and its applications, RIMS (Kyoto in Japan), May 30th, 2007.

(9) Classification of compact group actions on torus manifolds which have codimension 0 or 1 orbits: The 3rd COE Conference for Young Researchers, Hokkaido University (Hokkaido in Japan), February 15th, 2007.

(8) On transformation groups of torus manifolds: Singularity theory and O-minimal category, RIMS (Kyoto in Japan), November 28th, 2006.

(7) On transformation groups of torus manifolds: The 33rd symposium on Transformation group theory, Kanagawa prefectural administration center (Yokohama in Japan), November 22nd, 2006.

(6) Hypertorus graph and its equivariant cohomology: Methods of Transformation Group Theory, RIMS (Kyoto in Japan), May 24th, 2006.

(5) Hypertorus graph and its graph cohomology: Japanese Mathematical Society 2005 Autumn meeting, Okayama University (Okayama in Japan), September 20th, 2005.

(4) Classification of compact transformation groups on complex quadric with codimension one orbits: The 2nd Kinosaki Freshman seminar, Kinosaki Welfare Hall (Kinosaki in Japan), February 22nd, 2005.

(3) Classification of compact transformation groups on complex quadric with codimension one orbits: The 31st Symposium on Transformation group theory, Tokyo University of Science (Tokyo in Japan), November 17th, 2004.

(2) On the action of SL(3,R) on S^{4}: Transformation group and surgery, RIMS (Kyoto in Japan), May 24th, 2004.

(1) Classification of compact transformation groups on complex quadric with codimension one orbits: Topological Transformation Groups and Related Topics, RIMS (Kyoto in Japan), May 19th, 2003.


One day seminar, Colloquium and so on

(43) Equivariant cohomology of torus orbifolds: Algebraic Topology Seminar, Kyoto University (Kyoto, Japan), May 1st 2017. (invited) (Japanese)

(42) Classification of GKM graphs with combinatorial type $K_{4}$: STM09 Mini-workshop in Okayama, Okayama University of Science (Okayama, Japan), March 2nd 2017. (invited) (Japanese) (slides)

(41) Upper bounds for the dimension of tori acting on GKM manifolds: Fukuoka University Topology Seminar, Fukuoka University (Fukuoka, Japan), December 7th 2015. (invited) (Japanese)

(40) The root system of torus graphs: Geometry Seminar , Meiji University (Tokyo, Japan), July 9th 2015. (invited)

(39) On a classification of low dimensional torus manifolds: Tokyo Metropolitan University Geometry Seminar, Tokyo Metropolitan University (Tokyo, Japan), May 22nd 2015. (invited)

(38) Research on extended actions of torus actions by using GKM graphs: Award lecture of OCAMI Association Special Prize 2014, Osaka City University, March 4th 2015.(slides)

(37) On invariants of GKM graphs obtained from sheaves on labelled graphs: Toric Topology, Algebraic Topology and Combinatorics, Osaka City University, August 30th 2014.

(36) An application of torus graphs to characterize torus manifolds with extended actions: Tuesday Seminar on Topology, The University of Tokyo (Tokyo in Japan), May 20th 2014 (invited and given in Japanese).

(35) On GKM graphs with symmetries: Toric Topology 2014 in Himeji, Egret Himeji (Hyogo in Japan), April 7th 2014.

(34) An application of torus graphs to study extended actions of torus manifolds: Brain Circulation Joint Meeting of Mathematics and Physics, OCAMI (Osaka in Japan), March 31st 2014. (invited)

(33) Root systems of torus graphs: Colloquium talk, Ajou University (Suwon in Korea), March 21st 2014. (invited)

(32) Extended actions and classifications of torus manifolds: Joint Seminar in Math. and Phys. supported by JSPS Strategic Young Researcher Overseas Visits Program for Accelerating Brain Circulation “Deepening and Evolution of Mathematics and Physics, Building of International Network Hub based on OCAMI", Osaka City University (Osaka in Japan) November 29th 2013.(invited)

(31) Root systems of torus graphs and characterization of extended actions of torus manifolds: Geometry & Topology Seminar, The University of Western Ontario (London in Canada) September 23rd 2013. (invited)

(30) Classification of 6-dimensional equivariantly formal torus manifolds: Toric Topology Seminar in Moscow, Moscow State University (Moscow in Russia), June 24th 2013.

(29) Classification of 6-dimensional equivariantly formal torus manifolds: Symplectic Geometry Seminar University of Toronto (Toronto in Canada), March 4th 2013. (invited)

(28) Root systems of torus graphs and automorphism groups of torus manifolds: Joint Topology/Algebraic Topology Seminar Princeton University (Princeton in USA) February 21st 2013. (invited)

(27) Root systems of torus graphs and extended actions of torus manifolds: Geometry and Topology Seminar University of Waterloo (Waterloo in Canada), January 16th 2013. (invited)

(26) Root systems of torus graphs and characterization of extended actions of torus manifolds: Symplectic Geometry Seminar University of Toronto (Toronto in Canada), October 22nd 2012. (invited)

(25) Root systems of torus graphs and characterization of extended actions of torus manifolds: Geometry and Topology seminar, McMaster University (Hamilton in Canada), October 11th 2012. (invited)

(24) Root systems of torus graphs: Lie groups and invariant theory seminar (Vinberg seminar), Moscow State University (Moscow in Russia), September 26th, 2012. (invited)

(23) Root systems of torus graphs: Geometry and Topology seminar (Postonikov seminar), Moscow State University (Moscow in Russia), September 25th, 2012. (invited)

(22) Characterization of some GKM graphs with complexity one axial functions: Infromal seminar (15-min talk), Moscow State University (Moscow in Russia), September 18th, 2012. (invited)

(--) Several discussions about toransformation groups on exotic spheres: 24h Workshop on Transformation Groups, Adam Mickiewicz University (Poznan in Poland), September 10--11, 2012. (plenary)

(21) Rigidity problems in toric topology: OCAMI-Colloquium, Osaka City University Advanced Mathematical Institute (Osaka in Japan), June 20th 2012. (invited)

(20) Classification of 8-dimensional simply connected torus manifolds with $H^{2}=H^{odd}=0$: Extra Talks, Max Planck Institute for Mathematics (Bonn in German), March 5th, 2012.

(19) Infrasolv real moment-angle manifolds and small covers: Topology Seminars 2011/12, University of Manchester (Manchester in UK), February 27th, 2012. (invited)

(18) Classification of complex projective towers up to dimension 8 and cohomological rigidity: Topology Seminars 2011/12, University of Manchester (Manchester in UK), February 20th, 2012. (invited)

(17) Research on toric topology: Colloquium talk, Yamagata University (Yamagata in Japan), January 29th 2012. (invited)

(16) Research on toric topology: Colloquium talk, University of Tsukuba (Tsukuba in Japan), January 13th 2012. (invited)

(15) On cohomological rigidity problems of CP-towers: BK21 seminar of Ajou Univ, Ajou University (Suwon in Korea), August 24th 2011. (invited)

(14) On 6-dimensional GKM CP-towers: Informal seminar after Toric geomety, Toric topology and Combinatorics, Osaka City University, December 4th 2010. (invited)

(13) On cohomological rigidity of toric hyperKahler manifolds: Topology Seminor in SNU, Seoul National University (Seoul in Korea), May 11th, 2010. (invited)

(12) Equivariant cohomology determines hypertoric manifold: ASARC Regular Seminar, KAIST (Daejeon in Korea), October 13th, 2009. (invited)

(11) On extended G-actions of torus manifolds: The 31st PNU-PMI Algebraic Combinatorics Seminar, POSTECH (Pohan in Korea), June 10th, 2009. (invited)

(10) On projective bundles over 2-dimensional small covers: informal seminar, Osaka City University (Osaka in Japan), March 25th, 2009. (invited)

(9) Research on toric topology: Post-doctor final report, Fudan University (Shanghai in China), March 8th, 2009.

(8) Research of toric topology: Post-doctor starting report, Fudan University (Shanghai in China), January 6th, 2008.

(7) On graph equivariant cohomology: Osaka University Transformation group seminar, Osaka University (Osaka in Japan), June 30th, 2007. (invited)

(6) Classification of compact group actions on torus manifolds which have codimension 0 or 1 orbits: colloquium talk, Fudan University (Shanghai in China), March 9th, 2007. (invited)

(5) GKM graph and equivariant cohomology of graph: Differential topology seminar, Kyoto University (Kyoto in Japan), June 20th, 2006. (invited)

(4) Classification of compact transformation groups with codimension one orbits: Informal seminar after Toric Topology, Osaka City University (Osaka in Japan), June 6th, 2006. (invited)

(3) Classification of Transformation Groups: 2005 Thesis Defence, Osaka City University (Osaka in Japan), January 24th, 2006.

(2) Hypertorus graph and its graph cohomology: Osaka University Transformation Group Seminar, Osaka University (Osaka in Japan), October 15th, 2005. (invited)

(1) SL(m,H)\times SL(n,H)-action on S^{4(m+n)-1}: Osaka University Transformation Group Seminar, Osaka University (Osaka in Japan), June, 2003. (invited)