Search Results for author: Timothy C. Y. Chan

Found 9 papers, 4 papers with code

AutoLTS: Automating Cycling Stress Assessment via Contrastive Learning and Spatial Post-processing

no code implementations15 Aug 2023 Bo Lin, Shoshanna Saxe, Timothy C. Y. Chan

Cycling stress assessment, which quantifies cyclists' perceived stress imposed by the built environment and motor traffics, increasingly informs cycling infrastructure planning and cycling route recommendation.

Contrastive Learning

Machine Learning-Augmented Optimization of Large Bilevel and Two-stage Stochastic Programs: Application to Cycling Network Design

no code implementations20 Sep 2022 Timothy C. Y. Chan, Bo Lin, Shoshanna Saxe

We prove bounds on the optimality gap of the generated leader decision as measured by the original objective that considers the full follower set.

Representation Learning

Dynamic Control of Service Systems with Returns: Application to Design of Post-Discharge Hospital Readmission Prevention Programs

no code implementations28 Feb 2022 Timothy C. Y. Chan, Simon Y. Huang, Vahid Sarhangian

We study a control problem for queueing systems where customers may return for additional episodes of service after their initial service completion.

OpenKBP: The open-access knowledge-based planning grand challenge

1 code implementation28 Nov 2020 Aaron Babier, Binghao Zhang, Rafid Mahmood, Kevin L. Moore, Thomas G. Purdie, Andrea L. McNiven, Timothy C. Y. Chan

The purpose of this work is to advance fair and consistent comparisons of dose prediction methods for knowledge-based planning (KBP) in radiation therapy research.

The importance of evaluating the complete automated knowledge-based planning pipeline

no code implementations31 Oct 2019 Aaron Babier, Rafid Mahmood, Andrea L. McNiven, Adam Diamant, Timothy C. Y. Chan

We determine how prediction methods combine with optimization methods in two-stage knowledge-based planning (KBP) pipelines to produce radiation therapy treatment plans.

Generative Adversarial Network

Knowledge-based automated planning with three-dimensional generative adversarial networks

1 code implementation21 Dec 2018 Aaron Babier, Rafid Mahmood, Andrea L. McNiven, Adam Diamant, Timothy C. Y. Chan

Our pipeline consisted of a generative adversarial network (GAN) to predict dose from a CT image followed by two optimization models to learn objective function weights and generate fluence-based plans, respectively.

Medical Physics

Automated Treatment Planning in Radiation Therapy using Generative Adversarial Networks

1 code implementation17 Jul 2018 Rafid Mahmood, Aaron Babier, Andrea McNiven, Adam Diamant, Timothy C. Y. Chan

Knowledge-based planning (KBP) is an automated approach to radiation therapy treatment planning that involves predicting desirable treatment plans before they are then corrected to deliverable ones.

Feature Engineering Generative Adversarial Network

Learning to Optimize Contextually Constrained Problems for Real-Time Decision-Generation

no code implementations23 May 2018 Aaron Babier, Timothy C. Y. Chan, Adam Diamant, Rafid Mahmood

The topic of learning to solve optimization problems has received interest from both the operations research and machine learning communities.

Active Learning Portfolio Optimization +1

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