TY JOUR TI APPROACH TO BUILDING A MATHEMATICAL MODEL OF A PIPE FURNACE FOR OPTIMAL CONTROL KW Optimal control KW tubular furnace KW Pontryagin maximum principle KW parameter distribution KW boundary value problem JO Modern Technologies and Scientific and Technological Progress AU Demidchenko, E.A. AU Demidchenko, M.A. AU Istomin, A.L. PY 2026 IS 2026 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»