Zobrazeno 1 - 10
of 644
pro vyhledávání: '"Welsh, James P."'
Multi-agent reinforcement learning (MARL) has become a significant research topic due to its ability to facilitate learning in complex environments. In multi-agent tasks, the state-action value, commonly referred to as the Q-value, can vary among age
Externí odkaz:
http://arxiv.org/abs/2406.07848
Block coordinate descent is an optimization technique that is used for estimating multi-input single-output (MISO) continuous-time models, as well as single-input single output (SISO) models in additive form. Despite its widespread use in various opt
Externí odkaz:
http://arxiv.org/abs/2404.09071
Refined instrumental variable methods have been broadly used for identification of continuous-time systems in both open and closed-loop settings. However, the theoretical properties of these methods are still yet to be fully understood when operating
Externí odkaz:
http://arxiv.org/abs/2404.08955
When identifying electrical, mechanical, or biological systems, parametric continuous-time identification methods can lead to interpretable and parsimonious models when the model structure aligns with the physical properties of the system. Traditiona
Externí odkaz:
http://arxiv.org/abs/2401.01263
The Refined Instrumental Variable method for discrete-time systems (RIV) and its variant for continuous-time systems (RIVC) are popular methods for the identification of linear systems in open-loop. The continuous-time equivalent of the transfer func
Externí odkaz:
http://arxiv.org/abs/2305.19676
The identification of electrical, mechanical, and biological systems using data can benefit greatly from prior knowledge extracted from physical modeling. Parametric continuous-time identification methods can naturally incorporate this knowledge, whi
Externí odkaz:
http://arxiv.org/abs/2304.03259
The Consistency of the Closed-Loop Simplified Refined Instrumental Variable method for Continuous-time system (CLSRIVC) is analysed based on sampled data. It is proven that the CLSRIVC estimator is not consistent when a continuous-time controller is
Externí odkaz:
http://arxiv.org/abs/2103.12338
Autor:
DeJongh, Don F., DeJongh, Ethan A., Rykalin, Victor, DeFillippo, Greg, Pankuch, Mark, Best, Andrew W., Coutrakon, George, Duffin, Kirk L., Karonis, Nicholas T., Ordoñez, Caesar E., Sarosiek, Christina, Schulte, Reinhard W., Winans, John R., Block, Alec M., Hentz, Courtney L., Welsh, James S.
Purpose: Currently, calculations of proton range in proton therapy patients are based on a conversion of CT Hounsfield Units of patient tissues into proton relative stopping power. Uncertainties in this conversion necessitate larger proximal and dist
Externí odkaz:
http://arxiv.org/abs/2012.06629
Autor:
DeJongh, Ethan A., DeJongh, Don F., Polnyi, Igor, Rykalin, Victor, Sarosiek, Christina, Coutrakon, George, Duffin, Kirk L., Karonis, Nicholas T., Ordoñez, Caesar E., Pankuch, Mark, Winans, John R., Welsh, James S.
Publikováno v:
Med. Phys., 48: 1356-1364 (2021)
Purpose: To demonstrate a proton imaging system based on well-established fast scintillator technology to achieve high performance with low cost and complexity, with the potential of a straightforward translation into clinical use. Methods: The syste
Externí odkaz:
http://arxiv.org/abs/2009.04652
Autor:
Sarosiek, Christina, DeJongh, Ethan A., Coutrakon, George, DeJongh, Don F., Duffin, Kirk L., Karonis, Nicholas T., Ordoñez, Caesar E., Pankuch, Mark, Rykalin, Victor, Winans, John R., Welsh, James S.
Publikováno v:
Med. Phys., 48: 2271-2278 (2021)
Verification of patient specific proton stopping powers obtained in the patient treatment position can be used to reduce the distal margins needed in particle beam planning. Proton radiography can be used as a pre-treatment instrument to verify integ
Externí odkaz:
http://arxiv.org/abs/2009.04657