Papers
(29)
Positive definite quadratic forms representing integers of the form $an^2+b$
(with Y.-S. Ji and M.-H. Kim)
to appear in Ramanujan J.
(28)
Representations of arithmetic progressions by positive definite quadratic forms
Int. J. Number Theory 7(2011), 1603-1614.
(27)
Ternary universal sums of generalized pentagonal numbers
J. Korean Math. Soc. 48(2011), 837-847.
(26)
Regular positive ternary quadratic forms
Acta Arith. 147(2011), 233-243.
(25)
Almost universal ternary sums of triangular numbers
(with W. K. Chan)
Proc. Amer. Math. Soc. 137(2009), 3553-3562.
(24)
Mixed sums of squares and triangular numbers (III)
(with Z. W. Sun)
J. Number Theory. 129(2009), 964-969
(23)
Almost universal quadratic forms: an effective solution of a problem of Ramanujan
(with J. Bochnak)
Duke Math. J. 147(2009), 131-156
(22)
Almost regular quaternary quadratic forms
(with J. Bochnak)
Ann. Inst. Fourier (Grenoble) 58(2008), 1499-1549.
(21)
Primitive even $2$-regular positive quaternary quadratic forms
J. Korean Math. Soc. 45(2008), 621-630.
(20)
Extensions of representations of integral quadratic forms
(with W. K. Chan, B. M. Kim and M.-H. Kim)
Ramanujan J. 17(2008), 145-153.
(19)
Positive definite $n$-regular quadratic forms
Invent. Math. 170(2007), no. 2, 421--453.
(18)
New infinite families of 3-designs from algebraic curves of higher genus over finite fields
(with Hoseog Yu)
Electron. J. Combin. 14(2007).
(17)
Weighted sum of the extensions of the representations of quadratic forms
Manuscripta Math. 124(2007), no. 2, 261--267.
(16)
New infinite families of 3-designs from algebraic curves over $F_q$
(with Jangheon Oh and Hoseog Yu)
European J. Combin. 28(2007), no. 4, 1262--1269.
(15)
Representations of integral quadratic forms by sums of squares
(with M.-H. Kim)
Math. Z. 250 (2005), no. 2, 427--442.
(14)
Finiteness Theorems for Representability of quadratic froms by forms
(with B. M. Kim and M.-H. Kim)
J. Reine Angew. Math. 581(2005), 23--30.
(13)
Regularity properties of positive definite integral quadratic forms
(with A. G. Earnest and W. K. Chan)
Contemp. math. 344(2004), 56-71.
(12)
Positive ternary quadratic forms with finitely many exceptions
(with W. K. Chan)
Proc. Amer. Math. Soc. no. 6, 132(2004), 1567-1573.
(11)
The representation of quadratic forms by almost universal forms of higher rank
Math. Z. 244 (2003), no. 2, 399--413.
(10)
Finiteness theorems for positive definite $n$-regular quadratic forms
(with W. K. Chan)
Trans. Amer. Math. Soc. 355 (2003), no. 6, 2385--2396.
(9)
Bounds for quadratic Waring's problem
(with M.-H. Kim)
Acta Arith. 104 (2002), no. 2, 155--164.
(8)
A local-global principle for representations of binary forms by certain quinary forms
(with M.-H. Kim)
J. Korean Math. Soc. 39 (2002), no. 4, 525--542.
(7)
Representations of binary forms by certain quinary positive integral quadratic forms
(with J. K. Koo and M.-H. Kim)
J. Number Theory 89 (2001), no. 1, 97--113.
(6)
Generation of isometries of certain $\bold Z$-lattices by symmetries
(with M.-H. Kim)
J. Number Theory 83 (2000), no. 1, 76--90.
(5)
Universal $ Z$-lattices of minimal rank
Proc. Amer. Math. Soc. 128 (2000), no. 3, 683--689.
(4)
$2$-universal positive definite integral quinary quadratic forms
(with B. M. Kim and M.-H. Kim)
Contemp. Math. 249(1999), 51--62.
(3)
Representations of positive definite senary integral quadratic forms by a sum of squares
(with M.-H. Kim)
J. Number Theory 63 (1997), no. 1, 89--100.
(2)
A lower bound for the number of squares whose sum represents integral quadratic forms
(with M.-H. Kim)
J. Korean Math. Soc. 33 (1996), no. 3, 651--655.
(1)
On universal forms
Doctoral Thesis, Feb. 1999