Research Activities of Choong Sun Kim

April 2015: Wonju Spring School on Particle Physics and Cosmology, Wonju, Korea (*Member of Organizing Committee, Invited Coloquium presented);

April 2014: 27th Spring School on Particle Physics, Chang Guang University, Taiwan (*Member of International Committee);

April 2013: 26th Spring School on Particle Physics, National Taiwan Normal University, Taiwan (*Member of International Committee);

July 2012: Summer School on Cosmology, The Abdus Salam Institute of Theoretical Physics (ICTP), Trieste, Italy;

April 2012: 25th Spring School on Particle Physics, National Taiwan University, Taiwan (*Member of International Committee);

September 2011: Belle Analysis School, Jeje, Korea (*Invited Lecture presented);

July 2011: CTEQ 2011 Summer School on QCD Analysis and Phenomenology, Madison, WI;

February 2011: APCTP Winter School on Particle Physics, POSTECH, Pohang, Korea (*Chair of Organizer, Lecture presented);

March 2006-February 2009: APCTP Topical Research Program (TRP) on "CP violation in Quarks, Leptons and Universe", YongPyong, Korea (*Chair of Organizer, Lecture presented);

August 2006: Summer Institute (SI2006), APCTP, Pohang, Korea;

July 2004: Particle Physcs Summer Program, National Center for Theoretical Sciences (NCTS), National Tsinghua University, Hsinchu, Taiwan (*Organizer, Lecture presented);

April 2002: KIAS Spring School on Particle Physics, KIAS, Seoul, Korea;

June 2001: the 1st Korean High Energy Physics Summer Institute, Kyungppok National Universty, Korea (*Lecture presented);

April 2001: KIAS Spring School on Particle Physics, KIAS, Seoul, Korea;

February 2000: the Asian WINTER School on Particle Physics, KIAS, Seoul, Korea (*Local Organizer);

June-July 1999: International Center for Theoretical Physics (ICTP) SUMMER SCHOOL on Particle Physics, Trieste, Italy (*Organizer);

February 1999: the First WINTER School on Particle Physics -- B & CP-violation, Seoul, Korea (*Local Organizer, Talk presented);

June 1998: 'Korea Institute for Advaced Study (KIAS)' School on SUSY & Beauty, Seoul, Korea (*Lecture presented);

August 1997: ICTP Summer School on Particle Physics and Astrophysics, Trieste, Italy;

August 1996: the 9th Summer School on Nuclear Physics, Kwangju, Korea (*Lecture presented);

September 1990: the 11th UK Institute for Theoretical High Energy Physicists, St. Andrew, Scotland (*Talk presented);

August 1990: the 9th Theoretical Physics School on "Standard Model and the Beyond", Korea (*Lecture presented);

September 1989: the 10th UK Institute for Theoretical High Energy Physicists, Durham, England;

July 1987: Theoretical Advanced Study Institute (TASI-87), Los Alamos, New Mexico, U.S.A.;

August 1986: the 14th SLAC Summer Institute in Particle Physics on ``Standard Model and the Beyond,'' Stanford University, U.S.A.;

June 1986: the Theoretical Advanced Study Institute (TASI-86), University of California, Santa Cruz, U.S.A.

August 2024: Current Status of Flavor Anomalies and Future B-Factory, Nagoya University, Nagoya, Japan;

May 2024: Flavor Physics and CP Violation (FPCP-2024), Chulalongkorn University , Bangkok, Malasia (*International Advisory Committee);

April 2024: 6th Mini-Workshop on Chirality in the Universe Beyond the Electroweak Scale, Jirisan Resort, Korea (*Invited Speaker);

August 2023:  EAV 2023, CINVESTAV Advanced Summer School, Mexico City, Mexico (*Invited Colloquium Lecturer);

June 2023:  Annual Meeting of Division of Particles & Fields of Mexican Physical Society (DPyC-SMF), Mexico City, Mexico (*Invited Zoom Lecturer);

May 2023: Flavor Physics and CP Violation (FPCP-2023), Lyon University, Lyon, France (*International Advisory Committee);

April 2023: 5th Mini-Workshop on Chirality in the Universe Beyond the Electroweak Scale, Jirisan Resort, Korea (*Invited Speaker);

March 2023:  Seoul National University NAPP Workshop, Gangreung, Gangwon Province (*Invited Lecturer);

January 2023: 8th International Conference on High Energy Physics in the LHC Era, UTFSM, Valparaiso, Chile (*Invited Speaker);

November 2022: 4th Mini-Workshop on Chirality in the Universe Beyond the Electroweak Scale, Jirisan Resort, Korea (*Invited Speaker);

October 2022: Workshop on Physics of Dark Cosmos, Busan, Korea (*Invited Speaker);

August 2022: Apres-LHC Physics Workshop@Korea, Seoul, Korea (*Invited Speaker); 

July 2022: Inha HTG workshop: Modern issues in Hadronic Physics, Inchon, Korea (*Invited Speaker);

May 2022: Flavor Physics and CP Violation (FPCP-2022), Oxford, Mississippi, USA (*International Advisory Committee);

April 2022: Mini-Workshop on Chirality in the Universe Beyond the Electroweak Scale, Jirisan Resort, Korea (*Invited Speaker);

February 2022: 2022-ChungAng University Beyond the Standard Model Workshop, ChungAng University, Seoul, Korea (*Invited Speaker);

January 2022: Mini-Workshop on Axions and Neutrinos, HighOne Resort, Korea (*Invited Speaker);

October 2021: Korean Physical Society Fall Meeting, Virtual Conference through Zoom, Korea (*Invited Speaker);

August 2021: Korea LHC Workshop at KonKuk University, Virtual Conference through Zoom, Korea (*Invited Speaker);

June 2021: Flavor Physics and CP Violation (FPCP-2021), Shanghai, China (*International Advisory Committee);

April 2021: Mini-Workshop on Chirality in the Universe Beyond the Electroweak Scale, Jirisan Resort, Korea (*Invited Speaker);

June 2020: Flavor Physics and CP Violation (FPCP-2020), A Toxa, Spain (*International Advisory Committee);

July 2019: 8th Workshop on Flavor Symmetries and Consequencies in Accelerators and Cosmology (FLASY2019), Shanghai, China (*Invited Speaker);

May 2019: Flavor Physics and CP Violation (FPCP-2019), Victoria BC, Canada (*International Advisory Committee);

July 2018: Flavor Physics and CP Violation (FPCP-2018), Hyderabad, India (*International Advisory Committee);

July 2018: XXXIX International Conference on High Energy Physics (ICHEP-2018), Seoul, Korea (*Invited Speaker (Hyper-K Satellite Session));

July 2018: XXXIX International Conference on High Energy Physics (ICHEP-2018), Seoul, Korea (*Parallel Session Speaker (Neutrino Physics Session));

December 2017: The 14-th Saga--Yonsei Joint HEP Workshop, Yonsei University, Korea (*Invited Lecturer);

November 2017: Second Workshop on Korean Neutrino Observatory, Kyungpook National University, Korea (*Invited Speaker);

June 2017: Flavor Physics and CP Violation (FPCP-2017), Prague, Czech Replublic (*International Advisory Committee);

April 2017: 고 송희성 교수님 추모학회 (2017년 4월 12, 13일), 서울대학교 상산수리과학관 (*Invited Speaker);

October 2016: KIAS Research Station Program in Particle Physics. Kwangju, Korea (*Invited Speaker);

September 2016: Intensity Frontier in Particle Physics:, Flavor, CP Violation and Dark Physics, Taipei, Taiwan (*Invited Speaker);

June 2016: Flavor Physics and CP Violation (FPCP-2016), California Institute of Technology, USA (*International Advisory Committee);

May 2016: Planck 2016: From the Planck Scale to the Electroweak Scale, Valencia, Spain (*Invited Speaker);

May 2016: Benasque-2016, Higgs Tasting Workshop, Benasque, Spain (*Contributed Speaker);

November 2015: Mini-Workshop on Madgraph and BSM for the LHC/FC, CFHEP CAS/IHEP CAS, Beijing, China (*Invited Speaker);

September 2015: Kavli-IPMU-Durham-KIAS Workshop: New particle searches confronting the first LHC run-2 data, Kavli IPMU, Tokyo University, Japan (*Invited Speaker);

June 2015: 2015-BRL/NRF Yonsei Workshop on Exotic Phenomena of Gauge Theory (Flavor Physics), Toji Cultural Center, Wonju, Korea (*Member of Organizing Committee);

May 2015: Flavor Physics and CP Violation (FPCP-2015), Nagoya, Japan (*International Advisory Committee);

May 2015: The 11th Particle Physics Phenomenology Workshop (PPP11), Tankang University, Taipei, Taiwan (*Invited Speaker);

March 2015: Key Aspects in Exploring Road to Unification (KAERU Conference), Kavli IPMU, Tokyo University, Japan (*Invited Speaker);

January 2015: Joint Winter Conference on Particle Physics, String and Cosmology (YongPyong-High1 2015) (*Member of Organizing Committee);

November 2014: Korean Belle Meeting (K-Belle-2014), KISTI, Daejon, Korea (*Invited Lecturor);

October 2014: Workshop on "Heavy Ion Meeting (HIM-2014)", Yonsei University, Seoul, Korea (*Invited Speaker);

May 2014: Flavor Physics and CP Violation (FPCP-2014), Marseille, France (*International Advisory Committee);

April 2014: 2014-Yonsei Workshop on Particle Physics, Yonsei University, Seoul, Korea (*Member of Organizing Committee);

February 2014: KIAS-NCTS Joint Workshop on Particle Physics (High1-2014) (*Member of Organizing Committee);

December 2013: International Workshop on "High Energy Physics in LHC Era", UTFSM, Valparaiso, Chile (*Invited Speaker);

June 2013: 2013-NRF Workshop on Particle Physics and Cosmology, Yonsei University, Seoul, Korea (*Member of Organizing Committee, Invited Speaker);

May 2013: The 10th Particle Physics Phenomenology Workshop (PPP10), Chung-Yuan Christian University, Taiwan (*Invited Speaker);

May 2013: Flavor Physics and CP Violation (FPCP-2013), Rio de Janeiro, Brazil (*International Advisory Committee);

February 2013: YongPyong Winter Conference on Particle Physics (YongPyong-2013) (*Chair of Organizing Committee, Invited Speaker);

June 2012: 2012-NRF Workshop on Flavor Physics and Collider Physics, Yonsei University, Seoul, Korea (*Member of Organizing Committee);

May 2012: Flavor Physics and CP Violation (FPCP-2012), USTC, Hefei, China (*International Advisory Committee, Future Location Selection Committee);

May 2012: Pheno-2012, University of Pittsburgh, Pittsburgh, USA;

February 2012: YongPyong Winter Conference on Particle Physics (YongPyong-2012) (*Chair of Organizing Committee);

January 2012: International Workshop on "High Energy Physics in LHC Era", UTFSM, Valparaiso, Chile (*Invited Speaker);

November 2011: International Workshop on Double Beta Decays and Neutrinos, Osaka, Japan (*Invited Speaker);

June 2011: ICPP-Istanbul II "2nd International Conference on Particle Physics", Dogus University, Istanbul, Turkey (*Invited Speaker);

May 2011: Tev-2011 "Tevatron Anomalies and LHC", Seoul National University, Seoul, Korea (*Invited Speaker);

February 2011: YongPyong-2010 "Astro.Particles.Conformal in Topical Physics (APCTP)", YongPyong Ski Resort, Korea (*Chair of IAC and LOC, Invited Speaker);

November 2010: International Conference on Flavor Physics at the LHC Era, Nayang Technical University, Singapore (*Invited Speaker);

March 2010: The 34th Workshop on Gravitation and Numerical Relativity, Hamil Pension, Kanghwado, Korea;

February 2010: YongPyong-2010 "Astro.Particles.Conformal in Topical Physics (APCTP)", YongPyong Ski Resort, Korea (*Chair of IAC and LOC, Invited Speaker);

January 2010: International Workshop on "High Energy Physics in LHC Era", UTFSM, Valparaiso, Chile (*Invited Speaker);

November 2009: Busan University Particle Physics Workshop, Pusan, Korea (*Invited Speaker);

June 2009: IPMU International Conference on Dark Energy, Tokyo University, Tokyo;

May 2009: Particle Physics Phenomenolgy 2009 (PPP-2009), Tainan, Taiwan (*Invited Lecture);

February 2009: YongPyong-2009 "Astro.Particles.Conformal in Topical Physics (APCTP)", YongPyong Ski Resort, Korea (*Chair of IAC and LOC, Invited Lecture);

November 2008: Interdisciplinary and Creative Art Education Summit, Hong Kong Institute of Education, Hong Kong (Invited Discussant) ;

October 2008: Annual Korean Physical Society Meeting, Kwangju DJ Convention Center, Kwangju Korea (*Invited Speaker);

September 2008: DESY Theory Workshop on Dark Matter, Hamburg, Germany (*Invited Speaker);

June-July 2008: Advanced Topics on Flavor Physics, Kavli Institute of Theoretical Physics, Beijing, China (*Invited Lecture);

May 2008: International Conference on Flavor Physics and CP Violation (FPCP2008), Taipei, Taiwan (*Chair of Plenary Session & Member of International Organizing Committee);

February 2008: YongPyong-2008 "Astro.Particles.Conformal in Topical Physics (APCTP)", YongPyong Ski Resort, Korea (*Chair of IAC and LOC, Invited Lecture);

January 2008: LHC Workshop, UTFSM, Valparaiso, Chile (*Invited Speaker);

September 2007: the 4th International Conference on Flavor Physics (ICFP-2007), Inst. of Theoretical Physics, Beijing, China (*Invited Speaker);

August 2007: Lepton-Photon 2007 (LP2007), Daegu EXCO, Korea (*LOC, Chair of Plenary HOT-Topic Session);

June 2007: Particle Physics Phenomenology (PPP2007), Taipei, Taiwan (*Invited Speaker);

February 2007: Astro.Particles.CP Violation in Topical Physics (APCTP2007), YongPyong Ski Resort, Korea (*Chair of IAC and LOC, Invited Lecture);

December 2006: Neutrino Masses & Mixings 2006 (NMM2006), Shizuoka University, Japan (*Invited Speaker);

December 2006: CKM 2006, Nagoya University, Japan (*Invited Speaker);

August 2006: Summer Institute 2006, APCTP, Pohang, Korea (*Invited Speaker);

June 2006: Neutrino2006 -- Santa Fe, USA;

May 2006: the 15th mini-Workshop on Particle Physics, Seoul National University, Korea (*Invited Speaker);

October 2005: the 3rd International Conference on Flavor Physics (ICFP-2005), Chungli, Taiwan (*Invited Speaker);

July 2005: ACFA-LC8 Workshop on Physics of Linear Collider, Exco, Daegu, Korea (*Local Orgnaizer);

June 2005: PASCOS2005, Gyungjoo, Korea (*Local Organizer, Chair of Plenary Session);

November 2004: Mini-Workshop on Flavor Physics, Academia Sinica, Taiwan (*Invited Lecture);

November 2004: ACFA-LC7 Workshop on Physics of Linear Collider, National Taiwan University, Taiwan (*Invited Speaker);

October 2004: International Conference on Flavor Physics and CP Violation (FPCP2004), Daegu, Korea (*Chair of Local Organizing Committee & International Organizing Committee);

August 2004: the 32nd International Conference on High Energy Physics (ICHEP2004), Beijing, China (*Convenor of B&CP Session, Chair of Plenary Session & Parallel Session);

June 2004: KIAS-KAIST Joint Workshop on Particle Physics, KAIST, Korea (*Lecture presented);

June 2004: SNU-ABRL mini-Workshop at Mt. Jiri on Prticle Physics (*Invited Speaker);

January 2004: Annual Chilean HEP Meeting (*Invited Speaker);

October 2003: Annual Korean Physical Society Meeting (*Invited Speaker);

October 2003: the 2nd International Conference on Flavor Physics (ICFP), KIAS, Korea (*Local Organizer);

September 2003: the 3rd International Workshop on B Physics and CP Violation, Taipei, Taiwan (*Lecture presented);

May 2003: KIAS-KAIST Joint Workshop on Physics Beyond the Standard Model, KIAS, Korea (*Lecture presented);

August 2002: the 6th International Linear Collider Workshop, LCWS2002, Jeju Island, Korea (*Organizer, Electroweak & New/Alternative Theory Convenor);

July 2002: the 31st International Conference on High Energy Physics (ICHEP02), Amsterdam, Netherland (*Invited Speaker);

May 2002: Meeting of DPF-APS, College of Williams & Mary, U.S.A. (*Invited Speaker);

February 2002: the 1st Workshop on CKM-Unitarity, CERN, Geneva, Switzerland;

April 2001: Annual Korean Physical Society Meeting (*Invited Speaker);

October 2000: the 5th International Linear Collider Workshop, LCWS2000, Fermilab, U.S.A. (*New/Alternative Theory Convenor, Summary Speaker);

September 2000: DESY Theory Workshop, Hamburg, Germany;

September 2000: UK Phenomenology Workshop on Heavy Flavour and CP Violation, Durham, England (*Future CP Convenor, Summary Speaker);

July 2000: the 30th International Conference on High Energy Physics, Osaka, Japan;

April 2000: Pheno2000 Symposium, "Phenomenology at Nu Centry", Madison, WI, U.S.A.;

December 1999: DFG-KOSEF-KIAS Mini-Workshop on Physics at Future Colliders, Seoul, Korea (*Organizer, Invited Speaker);

December 1999: the 3rd International Conference on B physics & CP-violation, Taipei, Taiwan (*Lecture presented);

November 1999: ACFA Linear Collider Workshop, Seoul, Korea (*Local Organizer, Summary Speaker);

April 1999: International Linear Collider Workshop, Sitges, Spain (*New Physics Convenor);

July 1998: the 29th International Conference on High Energy Physics (ICHEP98), Vancouver, Canada;

July 1998: 1998 Summer RHIC Conference on Particle and Nuclear Physics, Brookhaven Lab, U.S.A.;

February 1998: Korean B-Physics Workshop, Seoul, Korea (*Local Organizer, Talk presented);

October 1997: APCTP Workshop, "Pacific Particle Physics Phenomenology", Seoul, Korea (*Local Organizer, Lecture presented);

October 1997: HERA Workshop, "International Workshop on HERA Physics", Seoul, Korea (*Local Organizer);

June 1997: the 7th Blois Workshop on "Recent Advances in Hadron Physics", Seoul, Korea (*Talk presented);

March 1997: International Conference of Quark Masses and Mixings, Shizuoka, Japan (*Lecture presented);

November 1996: the 3rd Workshop on Particle Physics Phenomenology, Taipei, Taiwan (*Talk presented);

October 1996: the 4th KEK Topical Conference on Flavor Physics, K.E.K., Japan (*Lecture presented);

August 1996: the 1st Asia-Pacific Conference on Strong Interaction, Taipei, Taiwan (*Talk presented);

August 1996: the 9th Summer School & Symposium on Nuclear Physics, Kwangju, Korea (*Lecture presented);

February 1996: Asian Science Seminar for Particle and Nuclear Physics (KOSEF-JSPS Winter School), Seoul, Korea (*Local Organizer, Talk presented);

August 1995: International Symposium for Heavy Flavor and Electroweak Theory, Beijing, China (*Lecture presented);

August 1995: the 17th International Symposium on Lepton-Photon Interactions (LP95), Beijing, China;

July 1995: Korean Theoretical Partcle Physics Symposium, Jeju Island, Korea (*Talk presented);

October 1994: Int. Workshop on B-physics (Physics beyond the Standard Model), Nagoya, Japan (*Lecture presented);

July 1994: the 27th International Conference on High Energy Physics, Univ. of Glasgow, Glasgow, U.K.;

December 1993: the 2nd Japanese - Korean Joint Workshop on Strangeness Nuclear Matter, Seoul, Korea (*Talk presented);

November 1993: CP - Violation (Its Implication to Particle Physics Cosmology), K.E.K., Japan (*Lecture presented);

July 1993: the 14th International Conference on Weak Interactions Neutrinos, Seoul, Korea (*Local Organizer, Lecture presented);

April 1993: the 2nd International Workshop on future Colliders, Hawaii, U.S.A. (*Talk presented);

July 1992: QCD - 20 Years Later, Univ. of Aachen, Germany (*Talk presented);

August 1991: QCD at Nonzero Temperature and Density, Brookhaven National Laboratory, U.S.A.;

December 1990: U.K. Phenomenology Initiative, Workshop on ``Jet Studies at LEP and HERA'', Durham, England (*Talk presented);

October 1990: DESY Theory Workshop 1990 on ``Wating for the Top Quark'', Hamburg, Germany (*Talk presented);

August 1990: the 9th Mt.-Sorak Theoretical Physics Symposium on ``Standard Model and the Beyond'', Seoul National University, Korea (*Lecture presented);

August 1990: the 4th Asia Pacific Physics Conference, Seoul, Korea (*Talk presented);

June 1990: the 13th Warsaw Symposium on Elementary Particle Physics, Kazimierz, Poland (*Talk presented);

April 1990: Annual Conference, Inst. of Physics HEPP Group, ``High Energy Particle Physics into Nineties'', Sheffield, England (*Talk presented);

September 1989: Workshop on ``Physics at Fermilab in 1990's'', Breckenridge, Colorado, U.S.A. (*Talk presented);

August 1989: International Symposium on Lepton and Photon Interactions at High Energies (LP89), Stanford, U.S.A.;

June 1989: ANL Symposium: Collider Phenomenology, Argonne National Laboratory, U.S.A. (*Talk presented);

August 1988: the 24th International Conference on High Energy Physics, Max-Planck-Institut, Munich, Germany;

July 1988: Summer Study on ``High Energy Physics in the 1990's'', Snowmass, Colorado, U.S.A. (*Talk presented);

May 1987: Workshop on ``From Colliders to Super Colliders'', University of Wisconsin, U.S.A. (*Talk presented);

July 1986: the 23rd International Conference on High Energy Physics (ICHEP86), University of California, Berkeley, U.S.A.;

May 1985: Workshop on ``New Particles 1985'', University of Wisconsin, U.S.A.

September-October 2024: Neutrino Science Research Center, ChonNam National University, Kwangju, Korea;

July-August 2024: Kobayashi-Maskawa Institute (KMI), Nagoya University, Nagoya, Japan;

April 2024: IBS Center for Underground Physics (IBS-CUP), Daejon, Korea;

January-February 2024: Department of Physics, Universidad Tecnica Federico Santa Maria, Valparaiso, Chile;

August 2023: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, WI, U.S.A.;

July-August 2023: Department of Physics, CINVESTAV, Mexico City, Mexico;

January-March 2023: Department of Physics, Universidad Tecnica Federico Santa Maria, Valparaiso, Chile;

December 2019-March 2020: Department of Physics, Universidad Tecnica Federico Santa Maria, Valparaiso, Chile;

August 2019: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, WI, U.S.A.;

June-July 2019: Inner Mongolia University, Hohhot, China: Xinyang Normal University, Xinyang, China: T.D. Lee Institute, Shanghai Jaotong University, Shanghai China;

December 2018-February 2019: Department of Physics, Universidad Tecnica Federico Santa Maria, Valparaiso, Chile;

February 2018: PITTsburgh Particle physics, Astrophysics, and Cosmology Center (PACC), University of Pittsburgh, Pittsburgh, USA;

December 2017-February 2018: Department of Physics, Universidad Tecnica Federico Santa Maria, Valparaiso, Chile;

June-August 2017: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, WI, U.S.A.;

February 2017: PITTsburgh Particle physics, Astrophysics, and Cosmology Center (PACC), University of Pittsburgh, Pittsburgh, USA;

February 2017: Department of Physics, CINVESTAV, Mexico City, Mexico;

December 2016-February 2017: Department of Physics, Universidad Tecnica Federico Santa Maria, Valparaiso, Chile;

September 2016: Department of Physics, National Taiwan University, Taipei, Taiwan;

July-August 2016: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, WI, U.S.A.;

July 2016: PITTsburgh Particle physics, Astrophysics, and Cosmology Center (PACC), University of Pittsburgh, Pittsburgh, USA;

May-June 2016: Consejo Superor de Investigaciones Cientificas (CSIC), Instituto de Fisica Corpuscular (IFIC), University of Valencia, Spain;

April-May 2016: Department of Physics, Technical University of Munich (TUM). Germany;

March-April 2016: Max-Planck Institute fuer Kernphysik, Heldelberg, Germany;

February-March 2016: Department of Physics, Universidad Tecnica Federico Santa Maria, Valparaiso, Chile;

December 2015-January 2016: PITTsburgh Particle physics, Astrophysics, and Cosmology Center (PACC), University of Pittsburgh, Pittsburgh, USA;

November 2015: Center for Future High Energy Physics (CFHEP), Inst. of High Energy Physics/CAS, Beijing, China;

August 2015: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, WI, U.S.A.;

June-August 2015: PITTsburgh Particle physics, Astrophysics, and Cosmology Center (PACC), University of Pittsburgh, Pittsburgh, USA;

February 2015: Department of Physics, Universidad Tecnica Federico Santa Maria, Valparaiso, Chile;

December 2014-January 2015: PITTsburgh Particle physics, Astrophysics, and Cosmology Center (PACC), University of Pittsburgh, Pittsburgh, USA;

October 2014: Institute of Physics (IoP), Hanoi, Vietnam; Department of Physics, Cantor University, Cantor, Vietnam;

June-August 2014: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, WI, U.S.A.;

January-February 2014: Department of Physics and Astronomy, Columbia University, New York, U.S.A.;

December 2013-January 2014: Department of Physics, Universidad Tecnica Federico Santa Maria, Valparaiso, Chile;

June-August 2013: Department of Physics and Astronomy, Columbia University, New York, U.S.A.;

February 2013: Department of Physics and Astronomy, University of Pensylvania, Philadelphia, U.S.A.;

December 2012-January 2013: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, WI, U.S.A.;

October-November 2012: Department of Physics and Astronomy, University of Bonn, Germany;

June-September 2012: The Abdus Salam International Center for Theoretical Physics (ICTP), Trieste, Italy;

April 2012: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, WI, U.S.A.;

April-May 2012: PITTsburgh Particle physics, Astrophysics, and Cosmology Center (PACC), University of Pittsburgh, Pittsburgh, USA;

December 2011-March 2012: Department of Physics, Universidad Tecnica Federico Santa Maria, Valparaiso, Chile;

July-August 2011: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, WI, U.S.A.;

October 2010: Department of Physics, Harbin Institute of Technology, Harbin, China;

August 2010: Department of Physics, Acdemia Sinica, Taipei, Taiwan;

July 2010: Institute for Physics and Mathematics of the Universe (IPMU), Tokyo University, Kashiwa, Japan;

January-February 2010: Department of Physics, Universidad Tecnica Federico Santa Maria, Valparaiso, Chile;

December 2009: National Center for Theoretical Sciences (NCTS), National Tsinghua University, Hsinchu, Taiwan;

June-August 2009: Institute for Physics and Mathematics of the Universe (IPMU), Tokyo University, Kashiwa, Japan;

January-February 2009: Department of Physics, Universidad Tecnica Federico Santa Maria, Valparaiso, Chile;

July-August 2008: Theoretical Physics Department, K.E.K., Tsukuba, Japan;

June-July 2008: Kavli Institue of Theoretical Physics, Beijing, China;

January-February 2008: Department of Physics, Universidad Tecnica Federico Santa Maria, Valparaiso, Chile;

December 2007: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, WI, U.S.A.;

September 2007: Department of Physics, Harbin Institute of Technology, Harbin, China;

June-July 2007: National Center for Theoretical Sciences (NCTS), National Tsinghua University, Hsinchu, Taiwan;

January-February 2007: Department of Physics, Universidad Tecnica Federico Santa Maria, Chile;

December 2006: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, WI, U.S.A.;

August 2006: Department of Physics, University of Bonn, Bonn, Germany;

June-August 2006: Institute of Particle Physics Phenomenology, Univ of Durham, Durham, England;

June 2006: Department of Physics and Astronomy, University of Pensylvania, Philadelphia, U.S.A.;

February-March 2006: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, WI, U.S.A.;

January 2006: Theoretical Physics Department, K.E.K., Tsukuba, Japan;

January-February 2006: Department of Physics, Hiroshima University, Hiroshima, Japan;

June-September 2005: Department of Physics, Hiroshima University, Hiroshima, Japan;

April 2005: Department of Physics, University of Oregon, Eugine, OR, U.S.A.;

January 2005: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, WI, U.S.A.;

December 2004: Korea Institute for Advanced Study, Seoul, Korea;

October 2004: Korea Institute for Advanced Study, Seoul, Korea;

August 2004: Dept of Physics, Henan Normal University, Shinhyang, Henan, China;

July 2004-February 2005: National Center for Theoretical Sciences (NCTS), National Tsinghua University, Hsinchu, Taiwan;

April 2004: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, WI, U.S.A.;

February 2004: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, WI, U.S.A.;

January-February 2004: Department of Physics, Universidad Tecnica Federico Santa Maria, Chile;

December 2003: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, WI, U.S.A.;

August 2003: Theoretical Physics Department, K.E.K., Tsukuba, Japan;

July 2003: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, WI, U.S.A.;

June 2003: Korea Institute for Advanced Study, Seoul, Korea;

February 2003: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, WI, U.S.A.;

January 2003: Max-Planck Institute for Physics, Munich, Germany;

December 2002-January 2003: National Center for Theoretical Sciences (NCTS), National Tsinghua Univ, Hsinchu, Taiwan;

August 2002: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, Madison, WI, U.S.A.;

July 2002: Theory Group, Techniche Univ. of Munich, Munich, Germany;

June 2002: Theory Group, Univ of Bern, Switzerland;

June 2002: Korea Institute for Advanced Study, Seoul, Korea;

April 2002: Korea Institute for Advanced Study, Seoul, Korea;

February-March 2002: Theory Group, Techniche Univ. of Munich, Munich, Germany;

February 2002: Theory Group, CERN, Geneva, Switzerland (as the Scientific Associate Fellow);

December-February 2002: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, Madison, WI, U.S.A.;

October 2001: Department of Physics, Universidad Tecnico Federico Santa Maria, Chile;

July-August 2001: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, Madison, WI, U.S.A.;

February 2001: Korea Institute for Advanced Study, Seoul, Korea;

January-February 2001: Theoretical Physics Department, K.E.K., Tsukuba, Japan;

October-December 2000: Department of Physics, University of Montreal, Montreal, Canada;

September 2000: Institute of Particle Physics Phenomenology, Univ of Durham, Durham, England;

August-September 2000: Theoretical Physics Group, DESY, Hamburg, Germany;

August 2000: Korea Institute for Advanced Study, Seoul, Korea;

March-November 2000: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, Madison, WI, U.S.A. (Visiting Professor as the University Fellow from Univ of Wisconsin);

February 2000: Department of Physics, University of Hawaii, U.S.A.;

January 2000: Korea Institute for Advanced Study, Seoul, Korea;

August 1999: Theoretical Physics Group, DESY, Hamburg, Germany;

June-July 1999: International Center for Theoretical Physics, Trieste, Italy;

January-February 1999: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, Madison, WI, U.S.A.;

October 1998: Korea Institute for Advanced Study, Seoul, Korea;

August 1998: Korea Institute for Advanced Study, Seoul, Korea;

August 1998: Department of Physics, Universidad Tecnico Federico Santa Maria, Chile;

July 1998: Theoretical Physics Department, Stanford University (SLAC), U.S.A.;

June-July 1998: Theoretical Physics Department, Brookhaven National Laboratory, U.S.A.;

February 1998: Department of Physics, University of Dortmund, Germany;

January-February 1998: Theoretical Physics Group, DESY, Hamburg, Germany;

December 1997: Department of Physics, Hiroshima University, Hiroshima, Japan;

June-August 1997: International Center for Theoretical Physics, Trieste, Italy;

January-Febrary 1997: Department of Physics, University of Montreal, Montreal, Canada;

November 1996: Department of Physics, University of Nagoya, Nagoya, Japan;

March 1996-Febrary 1997: Theoretical Physics Division, K.E.K., Tsukuba, Japan (Visiting Professor as the Center of Excellence Fellow from Japanese Munbusho);

January-February 1996: High Energy Physics Division, Argonne National Laboratory, U.S.A.;

June-July 1995: Theoretical Physics Department, K.E.K., Tsukuba, Japan;

January-February 1995: Department of Physics, Univ. of Melbourne, Melbourne, Australia;

July-August 1994: Theoretical Physics Group, DESY, Hamburg, Germany;

January-February 1994: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, Madison, WI, U.S.A.;

June-July 1993: Theoretical Physics Department, K.E.K., Tsukuba, Japan;

January-February 1993: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, Madison, WI, U.S.A.;

August 1992: Theoretical Physics Department, K.E.K., Tsukuba, Japan;

September 1991: Institute for Elementary Particle Physics Research, Univ of Wisconsin, Madison, Madison, WI, U.S.A.;

August 1991: Theoretical Physics Department, Brookhaven National Laboratory, U.S.A.;

March 1991: Theoretical Physics Group, DESY, Hamburg, Germany;

July 1990: I.N.F.N. Frascati, Italy;

June 1990: Dept. of Physics, Univ. of Bologna, Italy;

August 1989: High Energy Physics Division, Stanford Linear Accelerator Center, U.S.A.;

July 1989: Institute for Theoretical Particle Physics Research, UCLA, U.S.A.;

June-July 1989: Theoretical Physics Division, Fermi National Laboratory, U.S.A.;

June 1989: High Energy Physics Division, Argonne National Laboratory, U.S.A.;

May 1989: Institute for Elementary Particle Physics Research, Madison, Univ of Wisconsin, Madison, WI, U.S.A.;

March 1989: Theoretical Physics Group, DESY, Hamburg, Germany;

March 1988: High Energy Physics Division, Argonne National Laboratory, U.S.A.

October 2024: (Special Lecture Series on Theoretical Aspects of  Neutrino: Dirac, Majorana, Weyl, Chirality, Helicity, Seesaw and Mass) IBS Center for Underground Physics (IBS-CUP), Daejon, Korea;

September 2024: (Special Lecture Serires on Neutrino: Oscillation, pDMCT) Neutrino Science Research Center, ChonNam National University, Kwangju, Korea;

July 2024: (Special Topic Wine-Seminar) Kobayashi-Maskawa Institute (KMI), Nagoya University, Nagoya, Japan;

July 2024: (Seminar) Kobayashi-Maskawa Institute (KMI), Nagoya University, Nagoya, Japan;

May 2024: (Colloquium) Department of Physics, Chonnam National University, Gwangju, Korea;

January 2024: (Colloquium) Department of Physics, Universidad Tecnica Federico Santa Maria, Chile;

August 2023: (Seminar) Department of Physics, University of Wisconsin, Madison, WI, U.S.A.;

August 2023: (Colloquium) Department of Physics, CINVESTAV, Mexico City, Mexico;

April 2023: (Colloquium) Department of Physics, Chonnam National University, Gwangju, Korea;

March 2023: (Seminar) Department of Physics, Seoul National University, Seoul, Korea;

January 2023: (Zoom Seminar) Max-Planck Institute fuer Kernphysik, Heldelberg, Germany;

January 2023: (Colloquium) Department of Physics, Universidad Tecnica Federico Santa Maria, Chile;

November 2022: (Seminar) IBS Center for Underground Physics (IBS-CUP), Daejon, Korea;

November 2022: (Seminar) Department of Physics, Yonsei University, Seoul, Korea;

November 2022: (Seminar) Science Research Center on Neutrino, Chonnam National University, Gwangju, Korea;

November 2022: (Seminar) Department of Physics, Korea Advanced Institute of Science & Technology (KAIST), Daejon, Korea;

October 2022: (Seminar) Department of Physics, Asia Pacific Center for Theoretical Physics (APCTP), Pohang, Korea;

September 2022: (Seminar) Department of Physics, ChungAng University, Seoul, Korea;

August 2022: (Zoom Seminar) Joint seminar of KEK-Theory group & IPNS, Tsukuba, Japan;

July 2022: (Seminar) Department of Physics, Korea Advanced Study Institute (KIAS), Seoul, Korea;

July 2022: (Zoom Seminar) Instiute of High Energy Physics (IHEP), Beijing, China;

June 2022: (Seminar) IBS Center for Underground Physics (IBS-CUP), Daejon, Korea;

June 2021: (Seminar) Department of Physics, Asia Pacific Center for Theoretical Physics (APCTP), Pohang, Korea;

May 2021: (Seminar) Department of Physics, Yonsei University, Wonju, Korea;

November 2020: (Seminar) IBS Center for Underground Physics (IBS-CUP), Daejon, Korea;

September 2019: (Seminar) Department of Physics, Korea Advanced Study Institute (KIAS), Seoul, Korea;

July 2019: (Coloquium) Department of Physics, Xinyang Normal University, Xinyang, China;

July 2019: (Coloquium) Department of Physics, Inner Monglia University, Hohhot, China;

June 2018: (Coloquium) Department of Physics and IPAP, Yonsei University, Seoul, Korea;

November 2017: (Coloquium) Department of Physics and IPAP, Yonsei University, Seoul, Korea;

November 2017: (Seminar) IBS Center for Theoretical Physics in Universe (CTPU), Daejon, Korea;

October 2017: (Coloquium) Department of Physics, Ewha Woman University, Seoul, Korea;

August 2017: (Seminar) Department of Physics, University of Wisconsin, Madison, WI, U.S.A.;

March 2017: (Seminar) Department of Physics and IPAP, Yonsei University, Seoul, Korea;

February 2017: (Colloquium) Department of Physics, BU-AP, Puebla, Mexico;

February 2017: (Seminar) Department of Physics, CINVESTAV, Mexico City, Mexico;

February 2017: (Colloquium) Department of Physics, CINVESTAV, Mexico City, Mexico;

October 2016: (Seminar) Department of Physics and IPAP, Yonsei University, Seoul, Korea;

August 2016: (Seminar) Department of Physics, University of Wisconsin, Madison, WI, U.S.A.;

June 2016: (Seminar) Consejo Superor de Investigaciones Cientificas (CSIC), Instituto de Fisica Corpuscular (IFIC), University of Valencia, Spain;

May 2016: (Seminar) Department of Physics, University of Vienna, Austria;

May 2016: (Seminar) Department of Physics, Technical University of Munich (TUM). Germany;

April 2016: (Seminar) Max-Planck Institute fuer Kernphysik, Heldelberg, Germany;

December 2015: (Seminar) Department of Physics, Seoul National University, Seoul, Korea;

November 2015: (Seminar) Center for Future High Energy Physics (CFHEP), Inst. of High Energy Physics/CAS, Beijing, China;

October 2015: (Seminar) Department of Physics and IPAP, Yonsei University, Seoul, Korea;

August 2015: (Seminar) PITTsburgh Particle physics, Astrophysics, and Cosmology Center (PACC), University of Pittsburgh, Pittsburgh, USA;

April 2015: (Coloquium) Wonju Spring School on Particle Physics and Cosmology, Wonju, Korea;

January 2015: (Seminar) PITTsburgh Particle physics, Astrophysics, and Cosmology Center (PACC), University of Pittsburgh, Pittsburgh, USA;

October 2014: (Coloquium) Department of Physics, Cantor University, Cantor, Vietnam;

August 2014: (Seminar) Department of Physics, University of Wisconsin, Madison, WI, U.S.A.;

December 2013: (Seminar) Department of Physics, Seoul National University, Seoul, Korea;

September 2013: (Coloquium) Department of Physics and IPAP, Yonsei University, Seoul, Korea;

March 2013: (Seminar) Department of Physics and IPAP, Yonsei University, Seoul, Korea;

February 2013: (Seminar) Department of Physics and Astronomy, University of Pensylvania, Philadelphia, U.S.A.;

November 2012: (Seminar) Department of Physics and Astronomy, University of Bonn, Bonn, Germany;

September 2012: (Special Lecture to General Audience) "Interesting Story on Neutrinos", Kim Dae Jung Convention Center, Kwangju, Korea;

September 2012: (Lecture) Yonsei Particle Theory Group MT, Jindo Island, Korea;

September 2012: (Seminar) The Abdus Salam International Center for Theoretical Physics (ICTP), Trieste, Italy;

September 2012: (Seminar) Department of Physics, Sapienza University of Roma, Rome, Italy;

August 2012: (Seminar) Institute of Jozef Stefan (IJS), Ljubljana, Slovenia;

July 2012: (Seminar) The Abdus Salam International Center for Theoretical Physics (ICTP), Trieste, Italy;

April 2012: (Seminar) PITTsburgh Particle physics, Astrophysics, and Cosmology Center (PACC), University of Pittsburgh, Pittsburgh, USA;

March 2012: (Colloquium) Department of Physics, Universidad Tecnica Federico Santa Maria, Chile;

January 2012: (Seminar) Department of Physics, Universidad Tecnica Federico Santa Maria, Chile;

November 2011: (Invited Lecture) World Class University in Physics, Seoul National University, Seoul, Korea;

November 2011: (Invited Lecture) Saga Univ (Japan)--Yonsei Univ Joint Workshop, Yonsei University, Seoul, Korea;

August 2011: (Seminar) Department of Physics, University of Illinois at Chicago, Chicago, IL, U.S.A.;

August 2011: (Seminar) Department of Physics, University of Wisconsin, Madison, WI, U.S.A.;

November 2010: (Invited Lecture) Saga Univ (Japan)--Yonsei Univ Joint Workshop, Saga University, Saga, Japan;

October 2010: (College Colloquium) Department of Physics, Harbin Institute of Technology, Harbin, China;

August 2010: (Seminar) Department of Physics, National Taiwan University, Taipei, Taiwan;

August 2010: (Seminar) Department of Physics, Acdemia Sinica, Taipei, Taiwan;

August 2010: (Seminar) Department of Physics, National Tsinghua University, Hsinchu, Taiwan;

July 2010: (Colloquium) Department of Physics, Ochanomizu University, Tokyo, Japan;

July 2010: (Seminar) Inst. for Physics and Mathematics of the Universe, Tokyo University, Kashiwa, Japan;

April 2010: (Colloquium) Department of Physics, Chonnam National University, Kwangju, Korea;

December 2009: (Seminar) Department of Physics, National Tsinghua University, Hsinchu, Taiwan;

December 2009: (Seminar) Department of Physics, Acdemia Sinica, Taipei, Taiwan;

December 2009: (Seminar) Department of Physics, National Taiwan University, Taipei, Taiwan;

November 2009: (Invited Lecture) Saga Univ (Japan)--Yonsei Univ Joint Workshop, Yonsei University, Seoul, Korea;

October 2009: (Seminar) Department of Physics, Seoul National University, Seoul, Korea;

August 2009: (Colloquium) Department of Physics, Ochanomizu University, Tokyo, Japan;

August 2009: (Seminar) Department of Physics, Kyoto University, Kyoto, Japan;

August 2009: (Seminar) Inst. for Physics and Mathematics of the Universe, Tokyo University, Kashiwa, Japan;

February 2009: (Colloquium) Department of Physics, Universidad Tecnica Federico Santa Maria, Chile;

November 2008: (Invited Discussant) Interdisciplinary and Creative Art Education Summit, Hong Kong Institute of Education, Hong Kong;

November 2008: (Invited Lecture) Saga Univ (Japan)--Yonsei Univ Joint Workshop, Saga University, Saga, Japan;

November 2008: (Colloquium) Department of Physics, Chung-Ang University, Seoul, Korea;

November 2008: (Colloquium) Department of Physics, Konkuk University, Seoul, Korea;

October 2008: (Colloquium) Department of Physics, Yonsei University, Seoul, Korea;

August 2008: (Seminar) Physics Department, K.E.K., Tsukuba, Japan;

January 2008: (Colloquium) Department of Physics, Universidad Tecnica Federico Santa Maria, Chile;

September 2007: (Colloquium) Department of Physics, Harbin Institute of Technology, Harbin, China;

September 2007: (Seminar) Institute of High Energy Physics, Beijing, China;

June 2007: (Seminar) Department of Physics, National Tsinghua University, Hsinchu, Taiwan;

April 2007: (Colloquium) Department of Physics, Pusan National University, Pusan, Korea;

January 2007: (Seminar) Department of Physics, Universidad Tecnica Federico Santa Maria, Chile;

August 2006: (Seminar) Department of Physics and Astronomy, University of Bonn, Bonn, Germany;

July 2006: (Seminar) Institute of Particle Physics Phenomenology, Univ of Durham, Durham, England;

March 2006: (Colloquium) Department of Physics, Jeonbook National University, Jeonju, Korea;

November 2005: (Invited Lecture) Saga Univ(Japan)--Yonsei Univ Joint Workshop, Yonsei University, Seoul, Korea;

September 2005: (Seminar) Department of Physics, Hiroshima University, Hiroshima, Japan;

July-August 2005: (Lecture Series) Department of Physics, Hiroshima University, Hiroshima, Japan;

April 2005: (Seminar) Department of Physics, University of Oregon, Eugine, OR, U.S.A.;

April 2005: (Seminar) Department of Physics, Chonnam National University, Kwangju, Korea;

March 2005: (Colloquium) Department of Physics, Kyungpook National University, Daegu, Korea;

February 2005: (Seminar) Department of Physics, University of Wisconsin, Madison, WI, U.S.A.;

January 2005: (Seminar) Department of Physics, University of Wisconsin, Madison, WI, U.S.A.;

December 2004: (Seminar) Department of Physics, KIAS, Seoul, Korea;

November 2004: (Seminar) Department of Physics, National Taiwan University, Taipei, Taiwan;

October 2004: (Colloquium) Department of Physics, Hanyang University, Ansan, Korea;

September 2004: (Seminar) Department of Physics, National Tsinghua University, Hsinchu, Taiwan;

August 2004: (Colloquium) Department of Physics, Henan Normal University, Shinhyang, Henan, China;

January 2004: (Seminar) Department of Physics, Universidad Tecnica Federico Santa Maria, Chile;

May 2003: (Invited Lecture) Korea Linear Collider Physics Group, Seoul, Korea;

January 2003: (Seminar) Department of Physics, National Taiwan University, Taipei, Taiwan;

December 2002: (Colloquium) Department of Physics, National Tsinghua University, Hsinchu, Taiwan;

November 2002: (Colloquium) Department of Physics, Yonsei University, Seoul, Korea;

October 2002: (Colloquium) Department of Physics, Yonsei University, Seoul, Korea;

October 2002: (Colloquium) Pohang Univ of Science & Technology, Pohang, Korea;

October 2002: (Colloquium) Department of Physics, KIAS, Seoul, Korea;

July 2002: (Seminar) Theory Group, Techniche University of Munich, Munich, Germany;

June 2002: (Seminar) Theory Group, University of Bern, Switzerland;

March 2002: (Seminar) Department of Physics, Techniche University of Muenchen, Muenchen, Germany;

April 2001: (Colloquium) CHEP-SRC, Kyungpook National University, Daegu, Korea;

March 2001: (Seminar) Department of Physics, Seoul National University, Seoul, Korea;

February 2001: (Seminar) Department of Physics, Ochanomizu University, Tokyo, Japan;

January 2001: (Seminar) Physics Department, K.E.K., Tsukuba, Japan;

January 2001: (Invited Lecture) Belle Collaboration Meeting, KEK, Tsukuba, Japan.

November 2000: (Seminar) Department of Physics, University of Montreal, Montreal, Canada;

October 2000: (Seminar) Department of Physics, University of Wisconsin, Madison, WI, U.S.A.;

February 2000: (Seminar) Dept oartment Physics, University of Hawaii, U.S.A.;

December 1999: (Seminar) National Center for Theoretical Sciences, Hsinju, Taiwan;

June 1999: (Seminar) Department of Physics, KIAS, Seoul, Korea;

February 1999: (Seminar) Department of Physics, University of Wisconsin, Madison, WI, U.S.A.;

October 1998: (Colloquium) Department of Physics, Kunkook University, Seoul, Korea;

August 1998: (Colloquium) College of Science, Universidad Techinca Federico Santa Maria, Valpariso, Chile;

August 1998: (Seminar) Department of Physics, Universidad Techinca Federico Santa Maria, Valpariso, Chile;

July 1998: (Invited Lecture) SLAC, Stanford University, Stanford, CA, U.S.A.;

July 1998: (Seminar) Department of Physics, Brookhaven National Lab, New York, NY, U.S.A.;

April 1998: (Seminar) Department of Physics, Seoul National University, Seoul, Korea;

April 1998: (Colloquium) Natural Science College, Dongshin University, Kwangju, Korea;

March 1998: (Colloquium) Department of Physics, Yonsei University, Seoul, Korea;

February 1998: (Seminar) Department of Physics, Universitaet Dortmund, Dortmund, Germany;

January 1998: (Seminar) Theoretical Physics Group, DESY, Hamburg, Germany;

December 1997: (Colloquium) Department of Physics, Sungyunkwan University, Seoul, Korea;

November 1997: (Colloquium) Department of Physics, Seoul National University, Seoul, Korea;

October 1997: (Seminar) Department of Physics, KIAS, Seoul, Korea;

October 1997: (Colloquium) Department of Physics, Kyungsang University, Jinju, Korea;

September 1997: (Seminar) Department of Physics, Seoul National University, Seoul, Korea;

May 1997: (Seminar) Department of Physics, Seoul National University, Seoul, Korea;

February 1997: (Seminar) Department of Physics, University of Pensylvania, Philadelphia, PA, USA;

February 1997: (Seminar) Department of Physics, University of Montreal, Montreal, Canada;

January 1997: (Seminar) Department of Physics, Macgil University, Montreal, Canada;

November 1996: (Seminar) Department of Physics, Tohoku University, Sendai, Japan;

September 1996: (Seminar) Department of Physics, Tokyo Inst Tech, Tokyo, Japan;

August 1996: (Seminar) Department of Physics, Hiroshima University, Hiroshima, Japan;

August 1996: (Seminar) Department of Physics, Kobe University, Kobe, Japan;

July 1996: (Seminar) Department of Physics, Kyoto University, Kyoto, Japan;

July 1996: (Seminar) Department of Physics, Nagoya University, Nagoya, Japan;

June 1996: (Seminar) Department of Physics, Seoul National University, Seoul, Korea;

May 1996: (Invited Lecture) Belle Collaboration Meeting, KEK, Tsukuba, Japan.

September 2009 -- August 2011: (KOSEF) International Collaborative Research Project -- Professor Guo-Li Wang of Harbin Institute of Technolgy, China;

September 2004 -- August 2006: (KOSEF) International Collaborative Research Project -- Professor Dongsheng Du of IHEP, Professor Yadong Yang of Hernan University, China;

October 2001 -- September 2003: (KRF) Collaborative Research with Foreign Scholars -- Professor F. Halzen of Univ. of Wisconsin, U.S.A.;

April 2001 -- March 2003: (KOSEF) DFG-KOSEF Collaboration Project -- Professor A. Buras of Theory Group, Techniche Univ. of Muenchen, Germany;

January 1998 -- December 2000: (KRF) Collaborative Research with Foreign Distinguished Scholars -- Professor F. Halzen of Univ. of Wisconsin, U.S.A.;

April 1997 -- March 2000: (Japanese Munbusho) Munbusho International Scientific Research Program -- Professor M. Kobayashi of Theory Division, KEK, Japan;

January 1997 -- December 1999: (KOSEF) DFG-KOSEF Large Collaboration Project -- Professor P. Zerwas of Theory Group, DESY, Germany.