Songhao Wang
YOU?
Author Swipe
View article: An Online Non-Stationary Simulation Optimization Approach Based on Regime Switching
An Online Non-Stationary Simulation Optimization Approach Based on Regime Switching Open
Dynamic and evolving operational and economic environments present significant challenges for decision-making. We explore a simulation optimization problem characterized by non-stationary input distributions with regime-switching dynamics …
View article: Weighted Euclidean Distance Matrices over Mixed Continuous and Categorical Inputs for Gaussian Process Models
Weighted Euclidean Distance Matrices over Mixed Continuous and Categorical Inputs for Gaussian Process Models Open
Gaussian Process (GP) models are widely utilized as surrogate models in scientific and engineering fields. However, standard GP models are limited to continuous variables due to the difficulties in establishing correlation structures for c…
View article: Enhanced Global Optimization with Parallel Global and Local Structures
Enhanced Global Optimization with Parallel Global and Local Structures Open
In practice, objective functions of real-time control systems can have multiple local minimums or can dramatically change over the function space, making them hard to optimize. To efficiently optimize such systems, in this paper, we develo…
View article: Combined Global and Local Search for Optimization with Gaussian Process Models
Combined Global and Local Search for Optimization with Gaussian Process Models Open
Gaussian process (GP) model based optimization is widely applied in simulation and machine learning. In general, it first estimates a GP model based on a few observations from the true response and then employs this model to guide the sear…
View article: Mental health status and quality of life in elderly patients with coronary heart disease
Mental health status and quality of life in elderly patients with coronary heart disease Open
Background Coronary heart disease (CHD) is the leading cause of morbidity and mortality among elderly individuals. Patients with CHD are at high risk for mental health disorders, and psychological issues may affect the quality of life (QoL…
View article: A Data-Driven Bayesian Nonparametric Approach for Black-Box Optimization
A Data-Driven Bayesian Nonparametric Approach for Black-Box Optimization Open
We present a data-driven Bayesian nonparametric approach for global optimization (DaBNO) of stochastic black-box function. The function value depends on the distribution of a random vector. However, this distribution is usually complex and…
View article: A Multi-Level Simulation Optimization Approach for Quantile Functions
A Multi-Level Simulation Optimization Approach for Quantile Functions Open
Quantile is a popular performance measure for a stochastic system to evaluate its variability and risk. To reduce the risk, selecting the actions that minimize the tail quantiles of some loss distributions is typically of interest for deci…
View article: Experiment of aerosol-release time for a novel automatic metered dose inhaler
Experiment of aerosol-release time for a novel automatic metered dose inhaler Open
The objective of this study was to evaluate the aerosol-release time in the development of a new automatic adapter for metered dose inhaler. With this device, regular manually operated metered dose inhalers become automatic. During the stu…
View article: Development of an intelligent adapter for metered dose inhalers
Development of an intelligent adapter for metered dose inhalers Open
\nTo better coordinate the interaction of inhalation and aerosol release, an intelligent adapter (IA) was developed for metered dose inhalers (MDIs). The adapter included three main units: a signal acquisition device, a micro-control-unit …