Papers

$L^4$-norms and sign changes of Maass forms, to appear in Annals of Mathematics

(With J. Han and D. Park), Analytic behavior of some Euler products, Rocky Mountain J. Math. 51 (2021), no. 2, 539--548

(With S. Gonek), The pair correlation of zeros of the real part of the Riemann zeta-function, J. Number Theory 186 (2018), 35--61

(With H. Maier and A. Sankaranarayanan), Additive problems with smooth integers. Acta Arith. 175 (2016), no. 4, 301--319

(With Y. Komori and M. Suzuki), On the zeros of Weng zeta functions for Chevalley groups, Manuscripta Math.  148  (2015), no. 1--2, 119--176

(With J. Haan and S. Gonek), A uniqueness theorem for functions in the extended Selberg class,  Mathematische Zeitschrift 278 (2014), no. 3--4, 995--1004

(With Bao Qin Li), On uniqueness in the extended Selberg class of Dirichlet series, Proc. Amer. Math. Soc.  141  (2013),  no. 12, 4169--4173

A remark on the uniqueness of the Dirichlet series with a Riemann-type function equation, Advances in Mathematics 231 (2012), 2484--2490

(With Yoonbok Lee), Zeros of derivatives of the Riemann zeta function, Funct. Approx. Comment. Math. 47 (2012), no.1, 79--87

(With David Farmer), Siegel zeros and zeros of the derivative of the Riemann zeta function, Advances in Mathematics 230 (2012), 2048--2064

Zeros of zeta functions, Comment. Math. Univ. St. Pauli 60 (2011), 99--117

(With Yoonbok Lee), On the Zeros of Degree One $L$-functions from the Extended Selberg Class, Acta Arithmetica 149 (2011), 23--36

On the zeros of Weng's zeta function, Int. Math. Res. Notices (2010) 2010, 2367--2393

(With Yoonbok Lee), Zeros of derivatives of sum of Dirichlet $L$-functions, J. Number Theory 129(2009), no. 11, 2743--2746

(With Young-One Kim and Jungseob Lee), On the de Bruijn-Newman constant, Advances in Mathematics 222 (2009), 281-306

On the zeros of approximations of the Ramanujan $\Xi$-function, Ramanujan Journal 17(2008), no. 1, 123--143

On the zerosof sums of the Riemann zeta function, J. Number Theory 128 (2008), no. 9, 2704--2755

The zeros of the derivative of the Riemann zeta function near the critical line, Int. Math. Res. Notices (2008) Vol. 2008, article ID rnn064, 23pages

The zeros of Fourier transforms, {\sl Fourier series methods in complex analysis}, 113--127, Univ. Joensuu Dept. Math. Rep. Ser., 10, Univ. Joensuu, Joensuu,

(With Young-One Kim), The Zero-distribution and the Asymptotic Behavior of a Fourier Integral, J. Korean Math. Soc., 44 (2007), no. 2, 455--466

Zeros of the constant term in the Chowla-Selberg formula, Acta Arithmetica,  124 (2006) 197--204

On the nontrivial zeros of modified Epstein zeta functions, C. R. Math. Acad. Sci. Paris 342(2006), no. 2, 79--81

The Riemann $\Xi$-function under repeated differentiation, J. Number Theory 120 (2006), no. 1, 120--131

All but finitely many nontrivial zeros of the approximations of the Epstein zeta function are simple and on the critical line, Proc. London Math. Soc. 90(2005), 321--344

On a theorem of Levinson, J. Number Theory 107 (2004), no. 2, 287--297

(With Youngjoon Cha and Young-One Kim), A note on differential operators of infinite order, J. Math. Anal. Appl. 290 (2004), no. 2, 534--541

(With Young-One Kim), De Bruijn's Question on the Zeros of Fourier Transforms, Journal d'Analyse Mathematique, Vol. 91 (2003), 369--387

(With Young-One Kim), A Generalization of Newman's Result on the Zeros of Fourier Transforms, Computational Methods and Function Theory 2 (2002), no. 2, 449--467

(With Young-One Kim), Some recent progress in the theory of zeros of real entire functions (Korean), Commun. Korean Math. Soc. 17 (2002), no. 1, 1--14

(With Young-One Kim), On the number of nonreal zeros of real entire functions and the Fourier-P\'olya conjecture,  Duke Math. J. 104 (2000), no. 1, 45--73

(With Young-One Kim), On the zeros of some generalized hypergeometric functions. J. Math. Anal. Appl. 243 (2000), no. 2, 249--260

(With Joe Kamimoto and Young-One Kim),  On the multiplicities of the zeros of Laguerre-Polya functions. Proc. Amer. Math. Soc. 128 (2000), no. 1, 189--194

(With Yun Sung Choi and Sung Guen Kim),  Extreme Polynomials and Multilinear Forms on $l_1$, J. Math. Anal. Appl. 228 (1998), 467--482

On the Denjoy rank, the Kechris-Woodin rank and the Zalcwasser rank, Trans. Amer. Math. Soc. 349(7) (1997), 2845--2870

On the set of all continuous functions with uniformly convergent Fourier series, Proc. Amer. Math. Soc. 124(11) (1996), 3507--3514

The Kechris-Woodin rank is finer than the Zalcwasser rank, Trans. Amer. Math. Soc. 347(11) (1995), 4471--4484

The Borel Classes of Mahler's $A,S,T$ and $U$-numbers, Proc. Amer. Math. Soc. 123(10) (1995), 3197--3204

(With Tom Linton), Normal numbers and subsets of $\mathbb{N}$ with given densities, Fund. Math. 144(2) (1994), 163--179