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Presentations and Invited talks 

 

157) 2018,  December 6-8,  KSCV Workshop,  KIAS

Three lectures on Constrained Pfaff equations

156)  2018, September 6th,  Fall Meeting of KMS,  COEX

Constraint Pfaffian systems

155)  2018, March 15th,  Geometry seminar of Korea Universtiy

Conservation laws

154)  Korean Soc. for History of Math.

Symmetry of differential equations

153)  2017, March 31st   KAIST, 정오의 수학산책

Symmetry, invariants and conservation laws

152) 2016,  October  22,  KMS Fall,  SNU

Cartan-Kaehler theory by reduction of Pfaffian systems

151) 2016, July 4,  KSCV Symposium, Gyeong-Joo,   

Invariant submanifolds for vector fields and quasi-linear Cauchy-Riemann equations

150) 2016,  April,    KMS,  Spring Meeting,  April 22,  Suwon,  Applied Math Session

Controllability for the systems that are linear in controls with variable coefficients

149) 2015,  March,   Pusan National Universtiy, Colloquium,  Complex Analysis of 19th Century

148) 2014,  August 14,  International Congress of Mathemeticians-Seoul,  Short communications,

Quasi-linear perturbations of Cauchy-Riemann equations for several variables

147) 2014,  May 22,  International conference on complex analysis and geomtry,  Wuhan,  China

Generalized Frobenius theorem and the Cartan-Kaehler theory

 

146)  2014, April 25,  KMS Spring Meeting,  Gangneung

Generalizations of the Frobenius theorem on involutivity and an application to the controlability problem

 

145) 2013, October 26, KMS Fall Meeting

Cauchy data of higher codimensions for quasi-linear PDE systems of first order

 

144) 2013, June 24,  Wuhan University, China

Conservation laws for boundaries

 

143) 2013, June 18,  Conference on non-linear analysis and geometry,

Fujian Normal University, China

Method of characteristics for quasi-linear systems of first order

 

142) 2013, March 28, Trinity College, Dublin

Generalized Frobenius theorem and applications

 

141) 2013. March 21, Trinity College, Dublin, Colloquium,  

Conservation laws for the boundary

 

140) 2012, July 20th, KSCV Symposium 9,  Gyeongju,

Generalized Frobenius theorems and overdetermined PDE systems

 

139)  2012,  February 27th,  CR geometry workshop,  KIAS

Title:  Geometry of Levi-forms associated with the existence of complex submanifolds and the minimality

 

138) 2011, November 30th, UC-San Diego,

Title:  Reduction of Pfaffian systems and conservation laws

 

137) 2011,  November 29th,  UC-Irvine,  Analysis Seminar,  

Title:  Reduction of Pfaffian systems and conservation laws

 

136) 2011, September 26th,  University of Michigan,  Several Complex Variables Seminar,  

Title:  Reduction of Pfaffian systems and conservation laws

 

135)  2011,  April 30th,   KMS  Spring Meeting,  Korea University

Title:  Algebraic generalizations of the Newlander-Nirenberg theorem

 

134) 2011,  April 25th,   UC-Irvine,  Analysis Seminar

Title:  Quasi-linear Cauchy-Riemann equations 

 

133) 2011, March 3rd,  KIAS/SNU International Conference on Complex and Symplectic Geometry,

on the occasion of Prof. Dan Burns' 65th birthday,   February 28-March 3, Seoul National U.,  

Title:  Quasi-linear system of first order PDE

 

132)  2011. January 25th,  16th KSCV Workshop,  Kyungnam Univ.,

Quasi-linear system of first order PDEs

 

131)  2010,  November 5th,  Analysis Seminar, Pusan National U.,  

Perturbation of the Cauchy-Riemann equations

 

130)  2010,  October 23rd,  KMS Fall Meeting, Pohang U. of Science & Technology,

Boundaries of invariant domains of control systems given by vector fields

 

129) 2010,   June 7-8,   Three lectures at Kyuingpook National University

Symmetry of differential equations and conservation laws

 

128) 2010,   January 18th,  Seoul National University

복소수는 왜 사용하는가,   자연대탐방 고교생을 위한 강연

 

127)  2009,  December 21,  Erwin Schroedinger Institute, Wien

Partial integrability of almost complex structures

 

126)   2009, November 20th,  Chonnam Nat. U.  Invited talk

 Integrability questions  for almost complex structures

 

125)  2009, November 4th,  Seoul Nat. U.  SCV workshop

In between Newlander-Nirenberg and Nijenhuis-Woolf theorems

 

124)  2009, October 28th,  Kyungpook Nat. U.  Invited talk

Partial integrability of almost complex structures

 

123)  2009. October 15th,  Seoul National U.  학부생을 위한 강연

제목: 복소함수론의 역사

 

122) 2009, September 25th,  Postech Colloquium

Title: Notion of first integral and its complex analogues

 

121) 2009, August 30th,  Geometry Symposium, Saga University, Japan

Title:  Partial integrability of almost complex structures

 

120) 2009,  July 7th,  International Conference on Several Complex Variables, Complex Geometry

and Partial Differential Equations,  Wuhan, China

Title:  Partial integrability of almost complex structures

 

119)  2009,  April 27th,  International Workshop on Geometric structures and equivalence problems, at KIAS, Seoul

Title:  Generalized Frobenius theorems and solvability questions of  first order PDE systems

 

118)  2009, April 25th,   Korean Math. Society Meeting at Ajou Univ.,  Suwon

Title:  Generalized Frobenius theorems and solvability questions of  first order PDE systems

 

117)  2009,  April 10th,  Univ. of Padova,  Italy,     Complex analysis seminar

Title:  Minimality of generic CR manifolds

 

116)  2009, March 18th,  Kyungpook Nat. Univ.,  Colloquium for undergraduate students

Title:  History of complex analysis  복소함수론의 역사

 

115)  2009,  Feb 26-27,   Korea Institute for Advanced Study,  Series of talks

Titles:    1.  G-structures of Frobenius type

             2.  Foliations associated with Pfaffian systems

             3.  Solvability of overdetermined PDE systems

 

114)  2009,  Feb 12th,  University of Georgia, Athens,   Geometry seminar

Title:  Foliations associated with Pfaffian system

 

113)  2009,  Feb 6th,  Rutgers Univ - New Brunswick,  Complex analysis seminar

Title:  Frobenius theorem on involutivity

 

112)  2009,  Feb 5th,  Rutgers Univ - Camden,   Colloquium

Title: Frobenius theorem on involutivity

 

111)  2009,  Jan 29th,  Univ of Illinois,  Geometry seminar

Title:  Foliations associated with Pfaffian systems

 

110) 2008,  October 23rd,  KMS Fall Meeting,  Jaejoodo

Title:  Foliations associated with Pfaffian systems

 

109)  2008, August  7,   Conference on parabolic  geometry,  U. of Auckland

Title:  Existence  of  complex submanifolds and minimality of CR structures

 

108)  2008, July 22,   Univ. of Auckland,  Geometry seminar

Title: Generalized Frobenius theorems

 

107)  2008,  July 4th,  Univ. of Padova,   Complex analysis seminar

Title:  Generalized Frobenius theorem and minimality of generic CR manifolds

 

106)  2008,  April 30th,   KIAS,   Complex geometry seminar

Title:  Complex versions of Frobenius involutivity

 

105) 2008. April 26,  KMS Spring Meeting,  Keimyung Univ.,

Title:  Minimality of generic real submanifolds

 

104)  2008,   April 2,  Kyungbuk National Univ,  Colloquium for Undergraduates

Title:  군론과 기하학의 역사 (Group theory  and  history of geometry)

 

103)  2008,  February 22,  Rutgers University,  Analysis Seminar

Title:  Integrable submanifolds in almost complex manifolds

 

102)  2008, January 29th,  2nd Pusan-Pohang joint seminar on SCV, Postech

Title:  Generalized Frobenius theorem

 

101)  2007, October 20th,  Fall Meeting of Korean Math. Soc.,  KAIST

Title:  Integrable submanifolds in almost complex manifolds

 

100)  2007, July 6th,  Gyeong-Ju,  KSCV8 International Conference on SCV

Title:  A generalization of the Frobenius theorem and its applications:  

Integrable submanifolds in almost complex manifolds

 

99) 2007,  June 15th,  Banach Center, Poland,  Conference on SCV

Title: Complex submanifolds in real hypersurfaces

 

98) 2007,   May 26th,  영재 중고교생을 위한 서울대 토요과학교실,  3시간 강의

제목:  수학사의 관점에서 본 복소함수

 

97) 2007,  April 21st,  Korean Math. Soc.  Spring Meeting,  Special Session on SCV,

Inha University,      Title:  Complex submanifolds in real hypersurfaces

 

96) 2007,  April 20th,   Provance-Postech Joint Workshop on Complex Geometry,  Postech

Title:  Generalized Frobenius theorem and its applications

 

95) 2007,  February  16th,  Scuola Normale Superiore,  Pisa, Italy,  

Title:  Notions of involutivity

 

94) 2007,  January 5th and 9th,  Vietnamese Academy of Science and Technology,  

Hanoi University of Education,    Overdetermined PDE systems, I, II

 

93) 2006,  October 28th,  Korean Math. Soc.  Fall Meeting,  Special Session on SCV

Title:  Complex hypersurfaces in CR manifolds

 

92) 2006,  October 20th,  POSTECH Complex Analysis Seminar

TItle:  Involutive PDE systems

 

91) 2006,  October 18th,  KIAS Colloquium

Title:  Notions of involutivity

 

90) 2006,  September 5th,   

ICM Satellite Conference on CR geometry and PDE, Levico Terme, Italy

Title:   Symmetry algebra for multi-contact structures

 

89) 2006,  August 2nd,  IMA Summer School,

Symmetries and overdetermined systems of partial differential equations, 

Minneapolis,  July 17 - Aug 4

Title:  Pfaffian systems of Frobenius type and solvability of generic overdetermined PDE systems, 

 

88) 2006,  April 30th, BIRS Conference on CR geometry,  Banff, Canada,

Title:  Symmetry algebra of multi-contact structures given by $2n$  vector fields

 

87) 2006,  April 22nd,  Korean Math. Soc.  Spring Meeting,  Special  Session on SCV,  동아대

Symmetry algebra for integral curves of even number of vector fields

 

86) 2006,  February 7th,  International Conference on CR geometry (2/7-10),  

Univ. of New England, Australia

Organizer: Gerd Schmalz

Title:  Symmetry algebra for integral curves of even number of vector fields  

 

85) 2005, July 25th,  International Conference on Several Complex Variables  (7/20-25),

on the occasion of Professor Sheng Gong's 75th birthday,  Hefei (合肥), China.

Compatibility  conditions  and existence of solutions for overdetermined system of linear PDE's of first order

 

84)  2005,  June 11th,  서강대학교,  Complex Geometry Symposium,  

Overdetermined linear systems of first order: examples 

 

83)  2005,  May 6th,    오전 10  11  채플.  연세대 100주년 기념관,   

제목:  수학자와 기독교의 영성

 

82) 2005, April 23rd,  Korean Math. Soc. Spring Meeting,  Analysis Session,  단국대학교 천안

Compatibility conditions and solvability of overdetermined systems of linear pde's of      first order

 

81) 2005,  April 14th,  Seoul National Univ,  Math Colloquium  for Undergraduate  Students 

제목:  Moving frames

 

80) 2004,  December 27th,  CUNY,  Lehman College,   

Dimension bound of nondegenerate multi-contact structures

 

79) 2004,  November 15th,  Postech,  Complex Geometry Seminar

    Finiteness results in CR and contact geometry

 

78) 2004,  November 9th,  KIAS,   Complex Geometry Seminar

    Finiteness of generalized contact maps

 

77) 2004,  April 30th,  University of Michigan, Ann Arbor,  Geometry Seminar

    Solvability of overdetermined pde systems and CR embeddibility into spheres  

  

76) 2004,  February 25th,  University of Northern Iowa, Cedar Falls,   Colloquium

     Method of Moving Frames

 

75) 2003,  June 18th,  서울대학교 수리과학부 TA Workshop, 

미적분 발달사

 

74) 2003, May 22nd,  인하대  Math Colloquium,  

Pfaffian Systems

 

73) 2003, March 23rd,  경환 SCV 국제 워크숍, 진주 경상대학,

    Quasi-linear Pfaffian System

 

72) 2002, December 6th,  Postech,  Complex analysis seminar 

    Overdetermined PDE systems

 

71) 2002,  August 14th, 경주,  KSCV 6  (8/14-18),  

Local solvability of generic overdetermined PDE systems and some results in CR   geometry

 

70) 2002, July 31st, 신라대학교

10th  Conference on Finite or Infinite Dimensions   (7/29-8/2), 

Local solvability of generic overdetermined PDE systems and some results in CR   geometry

 

69) 2002,  July 8th, 권경환수학워크숍, 내장산관광호텔

    Some problems in CR geometry

 

68) 2002,  June 14th,  KAIST  Math Colloquium

    E. Cartan's geometry and overdetermined pde systems

 

67) 2002, May 24th,  Postech,   Workshop on SCV 

    Method of moving frames

 

66) 2002, April 19th,  황준묵 교수 과학상 수상 축하 강연, 고등과학원

    E. Cartan's method for overdetermined pde systems

 

65) 2001, July 27th,  44th Complex Analysis Symposium,   Nagoya University,  

    CR equivalence for higher codimensions 

 

64) 2001,  July 5th,   5th KSCV,  KIAS ,

    Local solvability of generic overdetermined pde systems

 

63) 2001,  June 27th,  International conference on complex analysis, 고려대학교,

    Holomorphic equivalence of real submanifolds

 

62) 2001,  May 17th,  Seoul National Univ.  Math Colloquium, 

Overdetermined pde system and complex analysis

 

61) 2001, April 21st,  Korean Math. Soc.  Spring Meeting, Analysis Session, 동의대학교,

Integrability of overdetermined pde system and equivalence of CR manifolds of higher codimensions

 

60) 2001,  January 31st,  University of California at San Diego,  Analysis Seminar,

Integrability of overdetermined pde systems and the CR embedding problem

 

59) 2001, January 22nd, University of Michigan, Several Complex Variables Seminar,  

Integrability of overdetermined pde systems and the CR embedding problem

 

58)  2000, September 26th, University of Illonois,  Differential Geometry Seminar,

Local isometric embedding of Riemannian manifolds

 

57) 2000,  March 23rd, University of Illonois,  Complex Analysis Seminar

Complete prolongation of tangential Cauchy-Riemann equations

 

56) 1999,  October 22nd,  Korean Math. Soc. Fall Meeting, Analysis Session, 원광대학교,

Finite determination of pseudoconformal mappings in nonanalytic categories

 

55) 1999,  August 14th ,  Fukuoka,  7th Conf on Finite and Infinite dimensions,

Finite determination of pseudoconformal mappings

 

54) 1999,  February 8th,  Purdue University, Geometric Analysis Seminar,

Some analytic aspects of the theory of invariants

 

53) 1998, October 15th,  成功(Cheng-Kung) University (Taiwan),  

Initesimal deformations of embeddings; conformal and CR cases

 

52) 1998,  August 28th, 대한수학회 학술상 수상기념강연, 제주대학교

Infinitesimal deformations of embeddings: conformal and CR cases

 

51) 1998,  August 12th,  Fribourg  University (Switzerland),

International Conference on CR geometry (Satellite Conf to Berlin ICM)  

Rigidity of immersions; conformal and CR cases

 

50) 1998,  July 27th, 안동대학교, Korea-China-Japan Conf on Finite and Infinite dimensions

Complete differential system and the rigidity of CR mappings

 

49) 1998,  July 14th, KIAS,  Complex analysis seminar,

Discontinuities in Bochner-Martinelli integral

 

48) 1998, April 17th, 중앙대학교, Math Colloquium

Infinitesimal deformations of embeddings; conformal and CR cases

 

47) 1998, February 19th,  Seoul National Univ,  KSCV 2  

Infinitesimal deformation of embeddings; conformal and CR cases

 

46) 1996, June 19th, 전남대학교, International Conf of SCV

Extension of proper holomorphic mappings

 

45) 1996, April 27th, 충남대학교, Korean Math. Soc.  Spring Meeting,  Analysis Session

Complete differential systems for CR mappings

 

44) 1996, January 9th,     Orlando, AMS Annual Meeting,

Special Session on Several Complex Variables, 

Complete differential system for CR mappings

 

43) 1995, December 22nd, 1995,   Hayama,

Complete differential system for CR embeddings

 

42) 1995, December 20th,   Nagoya University,  Complex analysis seminar

Complete differential system for CR mappings

 

41) 1995, July 31st, 이화여자대학교, Korea-China-Japan Conf on Finite and Infinite Dimensions,

Rigidity of embeddings

 

40) 1995,  Feburary 24th, 부산대학교, SCV mini-conference,

Prolongation of tangential Cauchy-Riemann equations

 

39) 1994, December 19th,   Osaka,  Conference on geometry of overdetermined pde systems, 

on the occasion of Professor  M. Kuranishi's 70th birthday,

Infinitesimal symmetries of isometric embeddings

 

38) 1994, December 16th,  Hokkaido Univ., Geometry Colloquium,

 Infinitesimal symmetries of isometric embeddings

 

37) 1994,  October 28th, 이화여자대학교, Math Colloquium,

Local geometric invariants

 

36) 1994, August 24th,   Beizing,  Academia Sinica,  

Local geometric invariants

 

35) 1994, March 4th,   Seoul National University,  Math Colloquium

Local geometric invariants

 

34) 1994, February 17th, Seoul National U. GARC Symposium,

E. Cartan's method of equivalence

 

33) 1993, July 12th, 부산, Korea-Japan Conf on Finite and Infinite dimensions

 Symmetry of differential equations  and local CR invariants

 

32) 1993, February 9th,  Wabash College, Math Colloquium, 

Symmetry of differential equations and Conservation laws

 

31) 1993, February 8th,  Purdue University, Complex Analysis Seminar,

Complete differential systems

 

30) 1993, January 21st,  University of Michigan, Complex Analysis Seminar,

Rigidity of hypersurfaces

 

29) 1992,  October 30th, 전북대학교, Math Colloquium

Symmetry of differential equations

 

28) 1992, October 17th, 국민대학교, Korean Math. Soc. Fall Meeting, Analysis Session

Rigidity of hypersurfaces (with C.K. Cho and J.N. Yoo)

 

27) 1992,  October 2nd, 경북대학교, Math Colloquium  

Jet approach of PDE's arising from geometry

 

26) 1992,  April, 수원(성균관대학교), Korean Math. Soc. Spring Meeting,  Analysis Session,

Complete differential systems (with C.K. Cho)

 

25) 1992,  February 17th,  Seoul National University,  GARC Symposium,

A method of prolongation and holomorphic extension of CR functions

 

24) 1991,  October 25th,   Postech,  Math Colloquium  

Extension of holomorphic mappings

 

23) 1991,  October 18th, 강원대학교, Korean Math. Soc. Fall Meeting, Analysis Session

Asymptotic hypersurfaces (with C.K. Cho)

 

22) 1991, April 27th, 육군사관학교, Korean Math. Soc.  Spring Meeting, Analysis Session

Ellipticity of isometric embeddings (with C.K. Cho)

 

21) 1990,  August 17th,   Hong Kong, Asian Pure Math Conference,

Ellipticity of local isometric embeddings

 

20) 1990, July,  Los Angeles, AMS Summer Institute, UCLA,

Ellipticity of local isometric embeddings

 

19) 1990,  April, 인하대학교, Korean Math. Soc.  Spring Meeting, Analysis Session

Invariants of certain system of first order pde's

 

18) 1989,  October,  포항공대, Korean Math. Soc.  Fall Meeting,  Invited talk,

Holomorphic extension of CR functions

 

17) 1989,  August,  대전, 4 KIT Workshop

Rigidity of isometric immersions

 

16) 1989,  July,   Santa Cruz, AMS Summer Institute,

Prolongation of differential systems

 

15) 1989, April,   KAIST Math Colloquium,

Tangential Cauchy-Riemann equations

 

14) 1989, March,  Seoul National University,  Math Colloquium 

Rigidity of CR manifolds

 

13) 1988,  October 28th,  Lawrence (U. of Kansas), 845th AMS Meeting,

Special Session on Differential Geometry

 Prolongation of differential systems and CR geometry

 

12) 1988,  April 24th,   College Park, 843th AMS Meeting,

Special Session on Several Complex Variables

Regularity of isometric immersions

 

11) 1987, October,   Texas Tech University, Math Colloquium,

Geometry of CR manifolds

 

10) 1987,  August 8th,   Salt Lake City (University of Utah), AMS Summer Meeting,

Regularity and uniqueness of isometric immersions

 

9) 1986, October,  Logan (Utah State Univ.), 828th AMS Meeting,

Special Session on Differential Geometry

 Regularity of mappings of G-structures

 

8) 1986,  July,  KAIST (Seoul), Math Colloquium

Regularity of mappings of G-structures

 

7) 1986,  July, 이화여자대학교, 대우순수수학 워크숍, Invited talk,

Regularity of mappings of G-structures

 

6) 1984, February,   Worcester, Clark University., Math Colloquium,

tangential Cauchy-Riemann equations

 

5) 1983, February,   Stillwater, Mississippi State U., Math Colloquium,

Tangential Cauchy-Riemann equations

 

4)  1982,  November,   Baton Rouge (Louisiana State University) 798th AMS Meeting,

Special Session on Several Complex Variables

 Analyticity of CR equivalences

 

3) 1981, October,  Columbia University., Math Colloquium,  

Analyticity of CR equivalences

 

2) 1981, July,  Oberwohlfach, West Germany,  International Conference on SCV,

 Analyticity of CR equivalences

 

1) 1981, January,  Institute for Advanced Studies,  Princeton,   SCV Special year  Seminar, 

Analyticity of CR equivalences