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| Talks and Lectures |
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| [1] |
“On Higher Degree Theta-Series of Half Integral Weight”, Annual
Meeting of American Math Society, New Orleans, Louisiana (January
7, 1986) |
| [2] |
"Higher Degree Theta-Series and Repns of Quadratic Forms”,
Internat'l Conf. on Quad. Forms and Real Algebraic Geometry, Oregon
State Univ., Corvallis, Oregon (July 30, 1986) |
| [3] |
"On Higher Degree Theta-Series of Half Integral Weight",
Fall Meeting of Korean Math. Society, Yonsei Univ., Seoul, Korea (October
24, 1986) |
| [4] |
"Higher Degree Theta-Series", Colloquium, Seoul Nat' Univ.,
Seoul, Korea (October 29, 1986) |
| [5] |
"Behavior of Theta-Series under Slash Operators", 7th
Workshops in Pure Math., Kangnung Nat'l Univ., Kangnung, Korea (July
14, 1987) |
| [6] |
"Behavior of Theta-Series under Slash Operators", Korea-Germany
Workshop on Algebra and Number Theory, Pusan Nat'l Univ., Pusan, Korea
(August 17, 1987) |
| [7] |
"A Criterion for the Binary Quadratic Forms", Fall Meeting
of Korean Math. Society, Chungbuk Nat'l Univ., Chongju, Korea (October
24, 1987) |
| [8] |
"The Canonical Decomposition of Siegel Modular Forms",
8th Workshop in Pure Math., Dankook Univ., Chonan, Korea (July 12,
1988) |
| [9] |
Introduction to Modular Forms, Colloquium, Seoul Nat'l Univ., Seoul,
Korea (April 18, 1989) |
| [10] |
"Hecke Operators and the Siegel Operator", Spring Meeting
of Korean Math. Society, Korea Military Academy, Seoul, Korea (April
29, 1989) |
| [11] |
"Modular Forms and Quadratic Forms, Colloquium", Ewha
Womans Univ., Seoul, Korea (May 24, 1989) |
| [12] |
"The Canonical Decomposition of Siegel Modular Forms and its
Application", 16th Journees Arithmetique, CIRM, Marseille, France
(July 18, 1989) |
| [13] |
"Introduction to Theta-Series", Colloquium, Inha Univ.,
Inchon, Korea (October 6, 1989) |
| [14] |
"A Correspondence between Hecke Rings", 10th Workshops
in Pure Math., Seoul Nat'l Univ., Seoul, Korea (August 29,30, 1990) |
| [15] |
"Brief History of Number Theory", Colloquium for Graduate
Students, Seoul Nat'l Univ., Seoul, Korea (April 19, 1990) |
| [16] |
"Mathematics of Fermat", Colloquium for Undergraduate
Students, Seoul Nat'l Univ., Seoul, Korea (November 11, 1990) |
| [17] |
"A Correspondence between Hecke Rings", Spring Meeting
of Korean Math. Society, Sungkyunkwan Univ., Suwon, Korea (April 27,
1991) |
| [18] |
"Higher Degree Theta-Series", Summer Symposium. Korean
Federation of Science and Technology Societies (July 4, 1991) |
| [19] |
"Introduction to Half Integral Weight Theta-Series", 11th
Workshops in Pure Math., Mokpo Nat'l Univ., Mokpo, Korea (July 16,18,
1991) |
| [20] |
"Spinor Generic Theta-Series", Fall Meeting of Korean
Math. Society, Kangwon Nat'l Univ., Chunchon, Korea (October 18, 1991)
|
| [21] |
"Action on Flag Varieties : 2-dimensional case", Spring
Meeting of Korean Math Society, Kookmin Univ., Seoul, Korea (April
25, 1992) |
| [22] |
"Spinor Generic Theta-Series", Internat'l Conf. on Pure
and Applied Math., Beijing and Yanji, China (August 15, 1992) |
| [23] |
"Arith. Half Integer Weight Theta-Series", Colloquium,
POSTECH, Pohang, Korea (April 16, 1993) |
| [24] |
"Half Integral Weight Theta-Series", Spring Meeting of
Korean Math. Society, Korea Military Academy, Seoul, Korea (April
24, 1993) |
| [25] |
"Unsolved Problems in Number Theory", Colloquium, Dept.
Physics, Seoul Nat'l Univ., Seoul, Korea (September 27, 1993) |
| [26] |
"Universal Positive Ternary Integral Quad. Forms over Real Quadratic
Fields", Number Theory Seminar, Ohio State Univ., Columbus, Ohio,
USA (November 1, 1994) |
| [27] |
" Unsolved Problems in Number Theory", Special Lecture for
Undergraduate Students, Seoul Nat'l Univ., Seoul, Korea (April 6,
1995) |
| [28] |
"Intro. to Univ. Pos. Integral Q. F.'s over Real Number Fields",
Colloquium, Chonbuk Nat'l Univ., Chonju, Korea (April 7, 1995) |
| [29] |
"Intro. to Univ. Pos. Integral Q. F.'s over Real Number Fields",
15th Workshops in Pure Math., Korea Nat'l Univ. of Education, Chongju,
Korea (July 10, 1995) |
| [30] |
"Mordell's Conjecture on Representations of Quadratic Forms",
Fall Meeting of Korean Math. Society, Pusan Nat'l, Univ., Pusan, Korea
(October 15, 1995) |
| [31] |
"On New Waring's Problem", Number Theory Seminar, POSTECH,
Pohang, Korea (May 1, 1996) |
| [32] |
"On New Waring's Problem", Number Theory Seminar, Ohio State
Univ., Columbus, Ohio, USA (August 1, 1996) |
| [33] |
"On New Waring's Problem", Conference on Euclidean Lattices
and Modular Forms, CIRM, Marseille, France (October 1, 1996) |
| [34] |
"On New Waring's Problem, Universal Forms, and Representation
Theory of Quadratic Forms", Conference on Basic Sciences, Chonnam
Nat'l Univ., Kwangju, Korea (June 4, 1997) |
| [35] |
"On Universal Forms - History, Recent Results, and Future",
16th Workshops in Pure Math., Ajou Univ., Suwon, Korea (July 7, 1997)
|
| [36] |
"On Universal Positive Definite Integral Quadratic Forms",
Number Theory Seminar, Univ. of Chile, Santiago, Chile (July 12, 1997)
|
| [37] |
"On Universal Positive Definite Integral Quadratic Forms",
Number theory Seminar, Univ. of Talca, Talca, Chile (July 15, 1997)
|
| [38] |
"Generation of Orthogonal Groups of Lattices by Symmetries",
ICAC-97, Chinese Univ. of Hong Kong, Hong Kong (August 20, 1997) |
| [39] |
"Unsolved Problems in Number Theory", Colloquium, Kangnung
Nat'l Univ., Kangnung, Korea (October 16, 1997) |
| [40] |
"Meaning of the Math Symbols and Expressions in Poems of Sang
Lee - Mathematical Point of View", Symposium Commemorating 300th
Volume of Munhaksasang, Sejong Art Hall, Seoul, Korea (November 12,
1997) |
| [41] |
"Generation of Orthogonal Groups of Lattices by Symmetries",
KIAS Number Theory Conference, KIAS, Seoul Korea (December 10, 1997)
|
| [42] |
"Fermat's Last Theorem" (in Korean), 5th Open Lecture Series
on Natural Sciences, College of Natural Sciences, Seoul Nat'l Univ.,
Seoul, Korea (February 24, 1998) |
| [43] |
"On Universal Positive Definite Integral Quadratic Forms",
Colloquium, Chosun University, Kwangju, Korea (March 30, 1998) |
| [44] |
"Unsolved Problems in Number Theory", Colloqium for Undergraduate
Students, Ehwa Womans Univ., Seoul, Korea (April 10, 1998) |
| [45] |
"Unsolved Problems in Number Theory", Colloqium, Dept. of
Math. Education, Seoul Nat'l Univ., Seoul, Korea (April 29, 1998)
|
| [46] |
"On Positive k-universal Integral Quadratic Forms", Internat'l
Conf. on Integral Quadratic Forms and Lattices, Seoul Nat'l Univ.,
Seoul, Korea (June 15, 1998) |
| [47] |
"Unsolved Problems in Number Theory", Colloquium for Undergraduate
Students, Chungnam Nat'l Univ., Taejon, Korea (May 7, 1999) |
| [48] |
"On Positive k-universal Integral Quadratic Forms", Colloquium,
Chungnam Nat'l Univ., Taejon, Korea (May 7, 1999) |
| [49] |
"On 2-universal Z-lattices", Number Theory Seminar, Nagoya
Univ., Japan, (July 6, 1999) |
| [50] |
"On Universal Forms and Related Topics", Number Theory Seminar,
KAIST, Taejon, Korea (October 21, 1999)
|
| [51] |
"Representations of Binary Forms by Quinary Quadratic Forms",
Number Theory Seminar, Ohio State Univ., Columbus, Ohio, USA (August
21, 2000) |
| [52] |
"Representations of Binary Forms by Quinary Quadratic Forms",
Algebra Seminar, Indiana Univ., Bloomington, Indiana, USA (August
25, 2000) |
| [53] |
"Representations of Integral Quadratic Forms by Sums of Squares",
Conference on Quadratic Forms and Lattices, CIRM, Marseille, France
(September 26, 2000) |
| [54] |
"Hilbert Problems on Quadratic Forms", Colloquium, Seoul
National Univ., Seoul, Korea, (June 14, 2001) |
| [55] |
"Hilbert Problems #11 and #17", Colloquium, Yonsei Univ.,
Seoul, Korea, (October 17, 2001) |
| [56] |
"Representations of Integral Quadratic Forms by Sums of Squares",
Fall Meeting of Korean Math. Society, Ehwa Womans Univ., Seoul, Korea
(October 20, 2001) |
| [57] |
"Unsolved Problems in Number Theory", NSRI Seminar, ETRI
(November 15, 2001) |
| [58] |
"Theory of Quadratic Forms", 6th SNU Algebra Camp, Sokcho,
Korea (November 30, December 1, 2001) |
| [59] |
"On Theory of Quadratic Forms", Seminar, Pohang Univ. Sci.
& Tech., Pohang, Korea (December 7, 2001) |
| [60] |
"Quadratic Warings Problem", 7th SNU Algebra Camp, Suanbo,
Korea (February 2-6, 2002) |
| [61] |
"Crypto-World" (in Korean), 9th Open Lecture Series on Natural
Sciences, College of Natural Sciences, Seoul Nat'l Univ., Seoul, Korea
(February 28, 2002) |
| [62] |
"Hilbert Problems #11 and #17", Seminar, Cheju National
Univ., Cheju, Korea (April 19, 2002) |
| [63] |
"Crypto-World" (in Korean), Sciences and Policy - Advanced
Research Course (SPARC), College of Natural Sci., Seoul National Univ.,
Seoul, Korea (May 16, 2002) |
| [64] |
"Crypto - A story of invisible war" (in Korean), 40th
Invited talk of Dong-A Science, Korean Federation of Sci. and Tech.
Societies Building, Seoul, Korea (August 8, 2002) |
| [65] |
"How to Attract Students to Science and Engineering",
Academic Council, College of Natural Science, Seoul National Univ.,
Suanbo (August 29, 2002) |
| [66] |
"Complete Generalization of the Fifteen Theorem", Colloquium,
Pohang Univ. Sci. & Tech., Pohang, Korea (October 25, 2002) |
| [67] |
"Crypto and Math" (in Korean), Undergraduate Colloquium,
Chungnam National Univ., Taejon, Korea (October 29, 2002) |
| [68] |
"Crypto-World" (in Korean), Sciences and Policy - Advanced
Research Course (SPARC), College of Natural Sci., Seoul National Univ.,
Seoul, Korea (October 29, 2002) |
| [69] |
"Complete Generalization of the Fifteen Theorem", Colloquium,
Yonsei Univ., Seoul, Korea (November 1, 2002) |
| [70] |
"Recent Developments on Universal Forms", 1st KIAS-POSTECH
Workshop on Number Theory and Modular Forms, KIAS, Seoul, Korea (December
6, 2002) |
| [71] |
"On Universal Forms - A Survey", International Conference
on Algebraic and Arithmetic Theory of Quadratic Forms, Pucon, Chile
(December 17, 2002) |
| [72] |
"On Universal Forms - A Survey", 2003 Number Theory -
Algebra Camp, KAIST, Taejon, Korea (January 12, 2003) |
| [73] |
"Universal Forms", 9th SNU Algebra Camp, Chonan, Korea
(February 5, 2003) |
| [74] |
"Crypto-World" (in Korean), Sciences and Policy - Advanced
Research Course (SPARC), College of Natural Sci., Seoul National Univ.,
Seoul, Korea (March 22, 2003) |
| [75] |
"Crypto - A story of invisible war" (in Korean), Science
and Technology Ambassador Lecture - Korean Science Foundation, Kwangyang
High School, Seoul, Korea (April 3, 2003) |
| [76] |
"Korean Math. Olympiad - Selection and Training" (in Korean),
21st Symposium of Math. Education, Yonsei Univ., Seoul Korea (July
5, 2003) |
| [77] |
"Crypto - A story of invisible war" (in Korean), Summer
Science Camp for Youth, Seoul National Univ., Seoul, Korea (August
7, 2003) |
| [78] |
"Crypto-World" (in Korean), Sciences and Policy - Advanced
Research Course (SPARC), College of Natural Sci., Seoul National Univ.,
Seoul, Korea (October 9, 2003) |
| [79] |
"Recent developments on universal forms", plenary talk,
The 2nd East Asian Conference on Algebra and Combinatorics (EACAC2),
Kyushu, Japan (November 19, 2003) |
| [80] |
"Recent developments on universal forms", Kyoto U. -
Seoul National U. Exchange Program for Young Mathematicians, RIMS,
Kyoto, Japan (November 21, 2003) |
| [81] |
"Crypto - A story of invisible war" (in Korean), Colloquium,
Soongsil Univ., Seoul, Korea (December 8, 2003) |
| [82] |
"Recent developments on universal forms", Number Theory
- Algebraic Geometry Seminar, Academy of Math. and System Sciences,
Chinese Academy of Sciences, Morningside Center, Beijing, China (December
15-16, 2003) |
| [83] |
"Crypto - A story of invisible war" (in Korean), Special
Lecture, Yanbian 1st High School, Yanji, China (December 19, 2003)
|
| [84] |
"Recent developments on universal forms", 11th SNU Algebra
Camp, Chonan, Korea (February 5, 2004) |
| [85] |
"Crypto- A story of invisible war" (in Korean), Colloquium,
Advanced Industrial Strategy Program (AIP), College of Engineering,
Seoul National Univ., Seoul, Korea (February 19, 2004) |
| [86] |
"Crypto - A story of invisible war" (in Korean), Colloquium,
Sejong Univ., Seoul, Korea (March 19, 2004) |
| [87] |
"A Story of Cryptography" (in Korean), Sciences and Policy
- Advanced Research Course (SPARC), College of Natural Sci., Seoul
National Univ., Seoul, Korea (April 22, 2004) |
| [88] |
"Unsolved Problems in Number Theory", ε-Colloquium, Seoul
National U., Seoul, Korea (May 6, 2004) |
| [89] |
"A Story of Cryptography" (in Korean), Sciences and Policy
- Advanced Research Course (SPARC), College of Natural Sci., Seoul
National Univ., Seoul, Korea (October 7, 2004) |
| [90] |
"Representation Theory of Quadratic Forms and Applications",
Japan-Korea Joint Seminar on Number Theory, Kuju, Japan (October 11,
2004) |
| [91] |
"A Local-global Principle for Extensibility of Representations
of Quadratic Forms and Applications", International Conference
on Lattices and Applications, Oberwolfach, Germany (January 7, 2005) |
| [92] |
"A Local-global Principle for Extensibility of Representations
of Quadratic Forms and Applications", Algebraic Geometry - Number
Theory Camp, KAIST, Taejon, Korea (February 3, 2005) |
| [93] |
"A Story of Cryptography" (in Korean), Special Lecture,
Sannam Middle School, Suwon, Korea (April 29, 2005) |
| [94] |
"One-way Chain based Broadcast Encryption Schemes", Eurocrypt
2005, Aahrus, Denmark (May 26, 2005) |
| [95] |
"A Story of Cryptography" (in Korean), Sciences and Policy
- Advanced Research Course (SPARC), College of Natural Sci., Seoul
National Univ., Seoul, Korea (June 7, 2005) |
| [96] |
"Mathematics behind Cryptography" (in Korean), Scent of
Science - Science Lecture Series of KBS, Taejon, Korea (June 25, 2005)
|
| [97] |
"Elementary Number Theory", Intensive Lectures on Cryptology,
SNU, Seoul Korea (July 4, 2005) |
| [98] |
"Finite Field Theory", Intensive Lectures on Cryptology,
SNU, Seoul Korea (July 4, 2005) |
| [99] |
"Broadcast Encryption Schemes", Intensive Lectures on
Cryptology, SNU, Seoul Korea (July 6, 2005) |
| [100] |
"Korean Math. Olympiads" (in Korea), Special Lecture,
Yusin High School, Suwon, Korea (July 25, 2005) |
| [101] |
"Gifted Students and Math. Olympiads" (in Korean), Summer
Seminar - Math Education in Middle and High Schools, Suwon, Korea
(August 17, 2005) |
| [102] |
"Introduction to Classical Theory of Quadratic Forms I~IV",
14th SNU Algebra Camp, Chonan, Korea (August 23-24, 2005) |
| [103] |
"Recent Development on Universal Forms", Colloquium, Wesleyan
Univ., Middletown, Connecticut, USA (October 20, 2005) |
| [104] |
"Broadcast Encryption Schemes", Seminar, Wesleyan Univ.,
Middletown, Connecticut, USA (November 3, 2005) |
| [105] |
"Recent Development on Universal Forms", Seminar, Univ.
of Connecticut, Storrs, Connecticut, USA (November 29, 2005) |
| [106] |
"Recent Development on Universal Forms", Colloquium, Univ.
of Delaware, Newark, Delaware, USA (March 3, 2006) |
| [107] |
"Recent Development on Universal Forms", Seminar, Univ.
of Southern Illinois, Carbondale, Illinois, USA (May 8, 2006) |
| [108] |
"Mathematics behind Cryptography", Sciences and Policy
- Advanced Research Course (SPARC), College of Natural Sci., Seoul
National Univ., Seoul, Korea (September 12, 2006) |
| [109] |
"Unsolved Problems in Number Theory", Science Lectures
for Youth, Science and Engineering Center for Youth, Seoul National
Univ., Seoul, Korea (October 21, 2006) |
| [110] |
"Mathematics behind Cryptography", Science Lectures for
Youth, Science and Engineering Center for Youth, Seoul National Univ.,
Seoul, Korea (October 21, 2006) |
| [111] |
"On Representation Theory of Quadratic Forms", Invited
Lecture, Global KMS Day - International Conf. Commemorating 60th Anniversary
of KMS, Seoul National Univ., Seoul, Korea (October, 28, 2006) |
| [112] |
[112] "Introduction to Modular Forms I~IV", 17th SNU Algebra
Camp, Chonan, Korea (February 6 & 9, 2007) |
| [113] |
"Unsolved Problems in Number Theory", Science Lectures
for Youth, Science and Engineering Center for Youth, Seoul National
Univ., Seoul, Korea (February 12, 2007) |
| [114] |
"Mathematics behind Cryptography", Science Lectures for
Youth, Science and Engineering Center for Youth, Seoul National Univ.,
Seoul, Korea (February 12, 2007) |
| [115] |
"Universal Quadratic Forms", Invited Lecture, 9th HU-SNU
Joint Symposium, Hokkaido, Japan (February 23, 2007) |
| [116] |
"Mathematics behind Cryptography", Sciences and Policy
- Advanced Research Course (SPARC), College of Natural Sci., Seoul
National Univ., Seoul, Korea (March 27, 2007) |
| [117] |
"Representation Theory of Quadratic Forms", Colloquium,
SungKyunKwan Univ., Suwon, Korea (March 29, 2007) |
| [118] |
"Cryptanalysis of the PJH Cryptosystem from PKC 2003",
PKC 2007, Beijing, China (April 17, 2007) |
| [119] |
"Extensions of Representations of Integral Quadratic Forms",
Seminar, Morningside Center of Math., Chinese Academy of Sciences,
Beijing, China (April 20, 2007) |
| [120] |
"Unsolved Problems in Number Theory", Weekend School for
IMO-bound Korean Team, Seoul National Univ., Seoul, Korea (May 6,
2007) |
| [121] |
"IMO-International Mathematical Olympiad", Korean Math.
Olympiad Workshop, Hanyang Univ., Seoul, Korea (May 19, 2007) |
| [122] |
"How to Make KMO Problems", Korean Math. Olympiad Workshop,
Hanyang Univ., Seoul, Korea (May 19, 2007) |
| [123] |
"Unsolved Problems in Number Theory", Seminar for Special
Freshmen of SNU, Seoul National Univ., Seoul, Korea (June 1, 2007)
|
| [124] |
"Mathematics behind Cryptography", Yeong-Saeng High School,
Chonju, Korea (June 2, 2007) |
| [125] |
"Entrance Exam of SNU", Yeong-Saeng High School, Chonju,
Korea (June 2, 2007) |
| [126] |
"Introduction to Modular Forms V~VI", 18th SNU Algebra
Camp, Chonan, Korea (August 9, 2007) |
| [127] |
"KMO, APMO and IMO", Yeon-Mu Junior High School, Suwon,
Korea (October 16, 2007) |
| [128] |
"Mathematics behind Cryptography", Sciences and Policy
- Advanced Research Course (SPARC), College of Natural Sci., Seoul
National Univ., Seoul, Korea (October 30, 2007) |
| [129] |
" Representation Theory of Quadratic Forms", Colloquium,
Pohang Univ. Science & Tech., Pohang, Korea (April 25, 2008) |
| [130] |
"Mathematics behind Cryptography", Sciences and Policy
- Advanced Research Course (SPARC), College of Natural Sci., Seoul
National Univ., Seoul, Korea (May 20, 2008) |
| [131] |
"Mathematics behind Cryptography", Sciences Sports Forum,
Seoul National Univ., Seoul, Korea (October 10, 2008) |
| [132] |
"Mathematics behind Cryptography", Sciences and Policy
- Advanced Research Course (SPARC), College of Natural Sci., Seoul
National Univ., Seoul, Korea (October 21, 2008) |
| [133] |
"IMO-International Mathematical Olympiad", KMO Winter
Camp, Chungnam National Univ., Taejon, Korea (January 8, 2009) |
| [134] |
"Unsolved Problems in Number Theory", KMO Winter Camp,
Chungnam National Univ., Taejon, Korea (January 8, 2009) |
| [135] |
"What is Mathematics?", 1st Mentoring Event for Woongjin
Scholarship Students, Woongjin Foundation, Seoul, Korea (January 31,
2009) |
| [136] |
"Introduction to Local Fields I~IV", 21st SNU Algebra
Camp, Chonan, Korea (February 4 & 5, 2009) |
| [137] |
"What is Mathematics?", Science Lectures for Youth, Science
and Engineering Center for Youth, Seoul National Univ., Seoul, Korea
(May 16, 2009) |
| [138] |
"Unsolved Problems in Number Theory", Science Lectures
for Youth, Science and Engineering Center for Youth, Seoul National
Univ., Seoul, Korea (May 16, 2009) |
| [139] |
"Deterioration of High School Graduates’ Academic Ability",
Forum on Future Education of Korea, The National Assembly, Seoul,
Korea (July 1, 2009) |
| [140] |
"What is Mathematics?", Okcheon Gifted Youth Domitory,
Sunchang, Korea (July 3, 2009) |
| [141] |
"Mathematics behind Cryptography", 2nd Mentoring Event
for Woongjin Scholarship Students, Woongjin Foundation, Seoul, Korea
(August 8, 2009) |
| [142] |
"What is Mathematics?", Yeongwol High School, Yeongwol,
Korea (August 13, 2009) |
| [143] |
"Unsolved Problems in Number Theory", Undergraduate Colloquium,
Yonsei Univ., Seoul, Korea (November 13, 2007) |
| [144] |
"Representation Theory of Quadratic Forms", Academic Award
Ceremony of Korean Math. Society, KMS-AMS Joint Meeting, Ewha Womans
Univ., Seoul, Korea (December 18, 2009) |
|
