Yunsoo Ha

College of Engineering

Works (3)

Updated: October 11th, 2025 05:05

2025 article

Complexity of Zeroth- and First-Order Stochastic Trust-Region Algorithms

Ha, Y., Shashaani, S., & Pasupathy, R. (2025, September 17). SIAM Journal on Optimization.

By: Y. Ha*, S. Shashaani*  & R. Pasupathy *

author keywords: stochastic optimization; efficiency; variance reduction; sample-path structure
topics (OpenAlex): Stochastic Gradient Optimization Techniques; Cryptography and Data Security; Privacy-Preserving Technologies in Data
Sources: Web Of Science, ORCID, NC State University Libraries
Added: October 7, 2025

2024 article

Iteration complexity and finite-time efficiency of adaptive sampling trust-region methods for stochastic derivative-free optimization

Ha, Y., & Shashaani, S. (2024, March 27). IISE Transactions, Vol. 4.

By: Y. Ha n & S. Shashaani n 

author keywords: Simulation optimization; zeroth-order oracle; finite-time performance
topics (OpenAlex): Stochastic Gradient Optimization Techniques; Markov Chains and Monte Carlo Methods; Sparse and Compressive Sensing Techniques
TL;DR: It is proved that the adaptive sampling with interpolation-based trust regions or ASTRO-DF has a canonical iteration complexity of $\mathcal{O}(\epsilon^{-2})$ almost surely, which is the first guarantee of its kind without placing assumptions on the quality of function estimates or model quality or independence between them. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: April 1, 2024

2023 article

Latency considerations for stochastic optimizers in variational quantum algorithms

Menickelly, M., Ha, Y., & Otten, M. (2023, March 16). Quantum.

By: M. Menickelly *, Y. Ha n & M. Otten *

topics (OpenAlex): Quantum Computing Algorithms and Architecture; Stochastic Gradient Optimization Techniques; Quantum Information and Cryptography
TL;DR: Stochastic optimization algorithms that yield stochastic processes emulating the dynamics of classical deterministic algorithms results in methods with theoretically superior worst-case iteration complexities, at the expense of greater per-iteration sample (shot) complexities. (via Semantic Scholar)
Source: Web Of Science
Added: June 5, 2023

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