Bui Trong Kien
Doctor
Department of Optimization and Control Theory

Address
Office: Building A5, Room 113
Tel: +84 (02)4 37563474/ 113
Email: btkien AT math.ac.vn
Born in Ninh Binh Province, Vietnam
Education and academic degrees:
1993: Bachelor science degree in math
2003: Doctoral degree in math 2003
Positions:
 Lecturer at Hoa Lu University, Ninh Binh, Vietnam (19942003)
 Lecturer at National University of Civil Engineering, Hanoi, Vietnam (20032012)
 Researcher at Department of Optimization and Control Theory, Institute of Mathematics, Vietnam Academy of Science and Technology, Hanoi, Vietnam (2012up to now)
 Postdoctoral fellow at Department of Applied Mathematics, National SunYat sen University, Taiwan (20052008)
 Postdoctoral fellow at Department of Mathematics, Pukyong National University, Republic of Korea (20082009)
 Experienced researcher of the Alexander von Humboldt Foudation at Department of Mathematics, DuisburgEssen University, Federal Republic of Germany (20122014).
Research areas: Variational Analysis, Nonlinear Analysis, Variational Inequality, Optimal Control, Partial Differential Equation
PUBLICATIONS
List of publications in MathSciNet
List of recent publications1  T. D. Binh, Bui Trong Kien, &N. H. Son, Local stability of solutions to a parametric multiobjective optimal control problem, Optimization, Volume 73, 2024, Pages 22472275, (SCIE, Scopus). 
2  Huynh Khanh, Bui Trong Kien, On the regularity of multipliers and secondorder optimality conditions of KKTtype for semilinear parabolic control problems, Journal of Mathematical Analysis and Applications Volume 538, Issue 1, 1 October 2024, 128436, (SCIE, Scopus) 
3  Bui Trong Kien, Arnd Rösch, Nguyen Hai Son, Nguyen Van Tuyen , FEM for semilinear elliptic optimal control with nonlinear and mixed constraints, Journal of Optimization Theory and Applications 197 (2023), 130173 2023, (SCIE, Scopus). 
4  Bui Trong Kien, N. Q. Tuan, Error Estimates for Approximate Solutions toSeminlinear Elliptic Optimal Control Problems with Nonlinear and Mixed Constraints, Numerical Functional Analysis and Optimization, 43 (2022), 16721706, (SCIE, Scopus). 
5  T. D. Binh, Bui Trong Kien, X. Qin, C.F. Wen, Regularity of multipliers in secondorder optimality conditions for semilinear elliptic control problems, Applicable Analysis: An International Journal, Volume 101, 2022, 55045516, (SCIE, Scopus). 
6  Bui Trong Kien, V. E. Fedorov, Ta Duy Phuong, Optimal Control Problems Governed by Fractional Differential Equations with Control Constraints, SIAM Journal on Control and OptimizationVol. 60, No. 3, pp. 1732–1762, 2022. 
7  M. V. Plekhanova, G. D. Baibulatova, Bui Trong Kien, Distributed control for semilinear equations with Gerasimove Caputo derivatives, CBΦY Mathematical, 28 (20221), 2 
8  Bui Trong Kien, Nguyen Thi Thu Huong, Xiaolong Qin, ChingFeng Wen, JenChih Yao, Regularity of solutions to a distributed and boundary optimal control problem governed by semilinear elliptic equations, Journal of Mathematical Analysis and Appplications, 495 (2021), 124694, (SCIE, Scopus). 
9  Bui Trong Kien, Nguyen Quoc Tuan, ChingFeng Wen, JenChih Yao , L^{\infty} Stability of a Parametric Optimal Control Problem Governed by Semilinear Elliptic Equations, Applied Mathematics & Optimization volume 84, pages 849–876 (2021), (SCIE, Scopus). 
10  Bui Trong Kien, Xiaolong Qin, ChingFeng Wen, JenChih Yao, SecondOrder Optimality Conditions for Multiobjective Optimal Control Problems with Mixed Pointwise Constraints and Free Right End Point, SIAM Journal on Control and Optimization, 58 (2020), no. 4, 2658–2677, (SCIE, Scopus). 
11  V.E. Fedorov, Ta Duy Phuong, Bui Trong Kien, K.V. Boyko, E.M. Izhberdeeva, A class of distributed order semilinear equations in banach spaces, Chelyabinsk Physical and Mathematical Journal 5 No. 3 (2020), 342351. 
12  Bui Trong Kien, SecondOrder Optimality Conditions and Solution Stability to Optimal Control Problems Governed by Stationary NavierStokes Equations, Acta Mathematica Vietnamica, 44 (2019), Issue 2, pp 431–448, Scopus. 
13  Bui Trong Kien, Jen Chih Yao, Semicontinuity of the solution set to a parametric optimal control problem, Applied Analysis and Optimization 2 (2018), 93116. 
14  Bui Trong Kien, N. V. Tuyen, J. C. Yao, Secondorder KKT optimality conditions for multiobjective optimal control problems, SIAM Journal on Control and Optimization, 56(2018), 40694097, SCI(E); Scopus. 
15  Bui Trong Kien, Jen Chih Yao, Local stability of solutions to parametric semilinear elliptic optimal control problems, Applied Analysis and Optimization 1 (2017), 361379. 
16  Bui Trong Kien, A. Rösch, D. Wachsmuth, Pontryagin’s Principle for Optimal Control Problem Governed by 3D Navier–Stokes Equations, Journal of Optimization Theory and Applications, 173 (2017), 30–55, SCI(E); Scopus. 
17  Bui Trong Kien, V. H. Nhu, N. H. Son, SecondOrder Optimality Conditions for a Semilinear Elliptic Optimal Control Problem with Mixed Pointwise Constraints, SetValued and Variational Analysis 25 (2017) 177–210, SCI(E); Scopus. 
18  N. H. Chieu, Bui Trong Kien, N. T. Toan, Further results on subgradients of the value function to a parametric optimal control problem, Journal of Optimization Theory and Applications, 168 (2016), 785801, SCI(E); Scopus. 
19  N. H. Son, Bui Trong Kien, A. Rösch, SecondOrder Optimality Conditions for Boundary Control Problems with Mixed Pointwise Constraints, SIAM Journal on Optimization, 26(2016), 1912–1943, SCI(E); Scopus. 
20  Bui Trong Kien, Gue Myung Lee, Nguyen Hai Son, First and SecondOrder Necessary Optimality Conditions for Optimal Control Problems Governed by Stationary Navier–Stokes Equations with Pure State Constraints, Vietnam Journal of Mathematics 44 (2016) 103131,Scopus. 
21  Bui Trong Kien, V. H. Nhu, A. Rösch, Secondorder necessary optimality conditions for a class of optimal control problems governed by partial differential equations with pure state constraints, Journal of Optimization Theory and Applications 165 (2015), 30–61, SCI(E), Scopus. 
22  Bui Trong Kien, V.H. Nhu, A. Rösch, Lower semicontinuity of the solution map to a parametric elliptic optimal control problem with with mixed pointwise constraints. Optimization, 64 (2015), 12191238, SCI(E), Scopus. 
23  Bui Trong Kien, Nhu, V. H, Secondorder necessary optimality conditions for a class of semilinear elliptic optimal control problems with mixed pointwise constraints. SIAM Journal on Control and Optimization 52 (2014), 1166–1202, SCI(E); Scopus. 
24  Bui Trong Kien, V. N. Nhu and N. H. Anh, Holder continuity of the solution map to an elliptic optimal control problem with mixed constraints, Taiwanese Journal of Mathematics, 17 (2013), 1245  1266, SCI(E); Scopus. 
25  Bui Trong Kien, Wong, N.C.; Yao, J.C., Necessary conditions for multiobjective optimal control problems with state constraints. Dyn. Contin. Discrete Impuls. Syst. Ser. B Appl. Algorithms 19 (2012), 431–446. 
26  Bui Trong Kien, N. T. Toan, M. M. Wong and J. C. Yao, Lower semicontinuity of the solution set to a parametric optimal control problem, SIAM Journal on Control and Optimization, 50 (2012), 2889  2906, SCI(E); Scopus. 
27  Bui Trong Kien, G.M. Lee, An existence theorem for generalized variational inequalities with discontinuous and pseudomonotone operators. Nonlinear Anal: Theory, Methods & Applications 74 (2011), 1495–1500. 
28  Nguyen Thi Toan, Bui Trong Kien, Continuity properties of the solution map to a parametric discrete optimal control problem. J. Nonlinear Convex Anal. 12 (2011), no. 3, 635–650. 
29  Nguyen Thi Toan, Bui Trong Kien, Subgradients of the value function to a parametric optimal control problem. SetValued Var. Anal. 18 (2010), 183–203. 
30  Bui Trong Kien, N. Q. Huy, N. C. Wong, On the solution existence of generalized vector quasiequilibrium problems with discontinuous multifunctions. Taiwanese J. Math. 13 (2009), 2B, 757–775. 
31  Bui Trong Kien, Wong, M.M.; Wong, N. C.; Yao, J. C., Degree theory for generalized variational inequalities and applications. European J. Oper. Res. 192 (2009), 730–736. 
32  Bui Trong Kien, Liou, Y. C.; Wong, N.C.; Yao, J.C., Subgradients of value functions in parametric dynamic programming. European J. Oper. Res. 193 (2009), 12–22. 
33  Bui Trong Kien, M. M. Wong, N. C. Wong, J. C. Yao, Solution existence of variational inequalities with pseudomonotone operators in the sense of Brézis. J. Optim. Theory Appl. 140 (2009), 249–263. 
34  Bui Trong Kien, MuMing Wong, NgaiChing Wong, On the degree theory for general mappings of monotone type. J. Math. Anal. Appl. 340 (2008), 707–720. 
35  Bui Trong Kien, Ngai Ching Wong, JenChih Yao, Generalized vector variational inequalities with starpseudomonotone and discontinuous operators. Nonlinear Anal.: Theory, Methods & Applications 68 (2008), 2859–2871. 
36  Bui Trong Kien, N.C. Wong & J.C. Yao, On the solution existence of implicit quasivariational inequalities with discontinuous multifunctions. Optimization 57 (2008), 515–526. 
37  Bui Trong Kien, N.C. Wong, and J.C. Yao, Necessary conditions for multiobjective optimal control problems with free endtime. SIAM J. Control Optim. 47 (2008), 2251–2274. 
38  Bui Trong Kien, JenChih Yao, Localization of generalized normal maps and stability of variational inequalities in reflexive Banach spaces. SetValued Anal. 16 (2008), 399–412. 
39  Bui Trong Kien, Lower semicontinuity of the solution map to a parametric generalized variational inequality in reflexive Banach spaces. SetValued Anal. 16 (2008), 1089–1105. 
40  LuChuan Ceng, Bui Trong Kien, N. C. Wong, Convergence analysis of a hybrid relaxedextragradient method for monotone variational inequalities and fixed point problems. Taiwanese J. Math. 12 (2008), 2549–2568. 
41  Bui Trong Kien, J.C. Yao, Nguyen Dong Yen, On the solution existence of pseudomonotone variational inequalities, J. Glob Optim., 41 (2008), 135145. 
42  Nguyen Dong Yen, J.C. Yao, Bui Trong Kien, Covering properties at positiveorder rates of multifunctions and some related topics, J. Math. Anal. Appl., 338 (2008), 467478. 
43  Bui Trong Kien, M. M. Wong, On the solution stability of variational inequalities. J. Global Optim. 39 (2007), 101–111. 
44  Bui Trong Kien, N. C. Wong, J. C. Yao, On the solution existence of generalized quasivariational inequalities with discontinuous multifunctions. J. Optim. Theory Appl. 135 (2007), 515–530. 
45  Bui Trong Kien, On the lower semicontinuity of optimal solution sets. Optimization 54 (2005), 123–130. 
46  Bui Trong Kien, Solution Sensitivity of Generalized Variational Inequalities and Continuity of Metric Projections, Ph.D. Thesis, Institute of Mathematics, Hanoi, Vietnam, 2003. 
47  Bui Trong Kien, Hölder continuity of solutions to a parametric problem of the calculus of variations. Nonlinear Anal. Forum 8 (2003), 123–136. 
48  Bui Trong Kien, The normalized duality mapping and two related characteristic properties of a uniformly convex Banach space. Acta Math. Vietnam. 27 (2002), 53–67. 
49  Bui Trong Kien, On the metric projection onto a family of closed convex sets in a uniformly convex Banach space. Nonlinear Anal. Forum 7 (2002), 93–102 
50  Bui Trong Kien, Solution sensitivity of a generalized variational inequality. Vietnam J. Math. 29 (2001), 97–113. 
1  IMH20170503, Bui Trong Kien, N.H. Son, Existence of global strong solutions to the NavierStokes equations with large input data 
2  IMH20160601, Bui Trong Kien, J. C. Yao, Semicontinuity of the solution map to a parametric optimal control problem 
Highlights
08/11/24, Conference: School and Workshop “Selected topics in Arithmetic Algebraic Geometry” 
29/11/24, Conference: ICTP and Vietnamese Science: Celebrating 60 Years of Collaborations 
02/12/24, Conference: International workshop on “Commutative Algebra and related Combinatoric structures” 