Publications
[35] S. H. Choi, H. Choi, and S.-Y. Choi, Risk aversion, safe-haven assets, and Bitcoin’s evolving role in global financial markets: Insights from quantile spillover analysis. AIMS Mathematics, vol. 11, no. 1, pp. 2481-2526, 2026.
[34] G. Yoon, H. Choi, H. Lee, A. Abdulali, G. Chowell, and S. Lee, COVID-19 transmission dynamics: age-specific patterns and super spreaders in South Korea. Plos One, 2026.
[33] H. Mohammad, S. M. Ibrahim, H. Choi, and R. B. Yunus,A diagonal Hestenes–Stiefel conjugate gradient algorithm with iterative complexity analysis and its application in robotic model. Oper. Res. Perspect., 2026.
[32] J.-H. Ju, T. Kim, Y. Kim, and H. Choi,Geometric mean for T-positive definite tensors and associated Riemannian geometry. J. Math. Anal. Appl., vol. 556, no. 1, pp. 130173, 2026.
[31] H. W. Lee, H. Choi, and H. Kim, Robust weight initialization for tanh neural networks with fixed point analysis, ICLR 2025 Poster, Jan. 23, 2025.
[30] B.-C. Shin, Y. Lim and H. Choi. The Geometric Mean of Min Matrices. Taiwanese J. Math. vol. 29, No. 3, pp. 449–465, 2025.
[29] L.-L. Han, L. Zeng, H. Choi, Y.-C. Lai, Y. Do. Scaling of nodal resilience and influence in complex dynamical networks. Chaos, vol. 35(5): 053111, 2025.
[28] J. Ding, H. Choi, Y. Wei and P. Xie, The tensor phase under a tensortensor product. Comp. Appl. Math., vol. 44, 121, 2025.
[27] I.-M. Lee, Y. Kim, T. Kim, H. Choi, S.Y. Yang, Y. Kim. Recursive reservoir concatenation for salt-and-pepper denoising, Pattern Recognition, vol. 160, pp. 111196, 2025.
[26] H. Lee, Y. Kim, S. Yang, and H. Choi. Improved weight initialization for deep and narrow feedforward neural network, Neural networks, vol. 176, pp. 106362, 2024.
[25] H. Lee, H. Choi, H. Lee, S. Lee, and C. Kim. Uncovering COVID-19 Transmission Tree: Identifying Reported and Unreported Infections in an Infection Network. Frontiers in Public Health, vol. 12, pp. 1362823, 2024.
[24] H. Choi, S. Kim and Y. Lim. A binomial expansion formula for weighted geometric means of unipotent matrices, Linear and Multilinear Algebra, 72:4, 615–630, 2024.
[23] Y. Kang, J. Hwang, H. Choi, Y. Do and Y. Lai. A nonlinear transient-dynamics approach to atopic dermatitis: Role of spontaneous remission, Chaos, Solitons and Fractals, vol. 179, pp. 114464, 2024.
[22] Mijin Kim, Hyungu Lee, Hayoung Choi. Finding explicit solutions for linear regression without correspondences based on rearrangement inequality, Journal of Applied Mathematics and Informatics No. 1, pp. 149–158, 2024.
[21] Seunghwan Baek, Hayoung Choi, Seonguk Yoo. On a construction method of new moment sequences, Monatshefte für Mathematik, vol. 205 pp. 55–69, 2024.
[20] H. Choi, S. Kim and Y. Lim. Linearity of Cartan and Wasserstein Means, Linear Algebra Appl., vol. 681, pp. 66–88, Jan. 2024.
[19] H. Choi, S. Kim and S. Y. Yang. Generalized G-Metric Spaces, Kyungpook Mathematical Journal, vol. 62, pp. 773–785, 2023.
[18] M. Fu, T. Jiang, H. Choi, Y. Zhou and Y. Shi, Sparse and Low-Rank Optimization for Pliable Index Coding via Alternating Projection, IEEE Transactions on Communications, vol. 70, no. 6, pp. 3708–3724, June 2022.
[17] H. Choi, S. D. Kim and B.-C. Shin. Choice of an initial guess for Newton’s method to solve nonlinear differential equations, Computers and Mathematics with Applications, vol. 117, pp. 69–73, July 2022.
[16] H. Choi and S. Yoo. Truncated Multi-index Sequences Have an Interpolating Measure, Kyungpook Mathematical Journal, vol. 62, no. 1, pp. 107–118, Mar. 2022.
[15] H. Choi and Y. Lim. Operator means of lower triangular matrices, Journal of Lie Theory, vol. 32, no. 1, pp. 175–190, 2022.
[14] Y. Shi, H. Choi, Y. Shi, Y. Zhou, Algorithm Unrolling for Massive Access via Deep Neural Network with Theoretical Guarantee, IEEE Transactions on Wireless Communications, vol. 21, no. 2, pp. 945–959, Feb. 2022.
[13] H. Choi, T. Jiang, Y. Shi, X. Liu, Y. Zhou and K. B. Letaief, Large-Scale Beamforming for Massive MIMO via Randomized Sketching, IEEE Transactions on Vehicular Technology, vol. 70, no. 5, pp. 4669–4681, May 2021.
[12] H. Choi, S. Kim, and Y. Shi. Geometric mean of partial positive definite matrices with missing entries, Linear Multilinear Algebra, 68:12, 2408–2433, 2020.
[11] H. Choi, E. Ghiglioni and Y. Lim, The Karcher mean of three variables and quadric surfaces, J. Math. Anal. Appl., vol. 490 No. 2, 124321, 2020.
[10] M. C. Tsakiris, L. Peng, A. Conca, L. Kneip, Y. Shi and H. Choi, An algebraic-geometric approach for linear regression without correspondences, IEEE Trans. Inf. Theory, vol. 66, no. 8, 5130–5144, 2020.
[9] H. Choi, S. Yoo, and Y.-N. Yeh. Catalan-like number sequences and Hausdorff moment sequences, Discrete Math., Volume 343, Issue 5, 2020, 111808.
[8] H. Choi, H. Choi, S. Kim, and H. Lee, Extension of block matrix representation of the geometric mean, J. Korean Math. Soc., Vol. 57, No. 3, 641–653, 2020.
[7] H. Choi, H. Lee, Y. Lim and S. Kim. Matrix extremal problems and shift invariant means Linear Algebra Appl., 587, 166–194, 2020.
[6] H. Choi, J. He, H. Hu, and Y. Shi. Fast computation of von Neumann entropy for large-scale graphs via quadratic approximations, Linear Algebra Appl. 585, 127–146, 2020.
[5] H. Choi, H. Lee, Y. Shen, and Y. Shi. Comparing large-scale graphs based on quantum probability theory, Appl. Math. Comput. 358, 1–15, 2019.
[4] H. Choi, V. Ginting, F. Jafari, and R. Mnatsakanov. Modified Radon transform inversion using moments, J. Inverse Ill-Posed Probl., 28(1) 1–15, 2019.
[3] S. Aryal, H. Choi, and F. Jafari. Hamburger moment sequences and their moment subsequences, Linear Multilinear Algebra, 65, 1838–1851, 2016.
[2] S. Aryal, H. Choi, and F. Jafari. Sparse Hamburger moment multisequences, Problems and recent methods in operator theory, 21–30, Contemp. Math., 687, Amer. Math. Soc., Providence, RI, 2017.
[1] H. Choi and F. Jafari. Positive definite Hankel matrix completions and Hamburger moment completions. Linear Algebra Appl., 489, 217–237, 2016.