TY - RPRT TI - Adaptive Sampling-Based Bi-Fidelity Stochastic Trust Region Method for Stochastic Derivative-Free Optimization AU - Ha, Yunsoo [Cornell University] AU - Mueller, Juliane [National Laboratory of the Rockies, Golden, CO (United States)] PY - 2026 DO - 10.1007/s12532-026-00332-3 UR - https://www.osti.gov/biblio/3577319 ID - 3577319 ER -