Search Results for author: Mark Lewis

Found 10 papers, 1 papers with code

Explaining mountain pine beetle dynamics: From life history traits to large, episodic outbreaks

no code implementations19 Dec 2023 Evan Johnson, Mark Lewis

However, two life history traits -- MPB's size-dependent fecundity and preference for large trees -- are responsible for 25% of the peak number of beetles.

From policy to prediction: Forecasting COVID-19 dynamics under imperfect vaccination

no code implementations15 Jan 2022 Xiunan Wang, Hao Wang, Pouria Ramazi, Kyeongah Nah, Mark Lewis

Recently, we created a method in forecasting the daily number of confirmed cases of infectious diseases by combining a mechanistic ordinary differential equation (ODE) model for infectious classes and a generalized boosting machine learning model (GBM) for predicting how public health policies and mobility data affect the transmission rate in the ODE model [WWR+].

A hypothesis-free bridging of disease dynamics and non-pharmaceutical policies

no code implementations8 Dec 2021 Xiunan Wang, Hao Wang, Pouria Ramazi, Kyeongah Nah, Mark Lewis

Typically, a hypothesis is made on the form of the transmission rate with respect to time.

Efficient QUBO transformation for Higher Degree Pseudo Boolean Functions

no code implementations24 Jul 2021 Amit Verma, Mark Lewis, Gary Kochenberger

Quadratic Unconstrained Binary Optimization (QUBO) is recognized as a unifying framework for modeling a wide range of problems.

QUBO transformation using Eigenvalue Decomposition

no code implementations19 Jun 2021 Amit Verma, Mark Lewis

Quadratic Unconstrained Binary Optimization (QUBO) is a general-purpose modeling framework for combinatorial optimization problems and is a requirement for quantum annealers.

Combinatorial Optimization

Constraint Programming to Discover One-Flip Local Optima of Quadratic Unconstrained Binary Optimization Problems

no code implementations4 Apr 2021 Amit Verma, Mark Lewis

The broad applicability of Quadratic Unconstrained Binary Optimization (QUBO) constitutes a general-purpose modeling framework for combinatorial optimization problems and are a required format for gate array and quantum annealing computers.

Combinatorial Optimization

Goal Seeking Quadratic Unconstrained Binary Optimization

no code implementations24 Mar 2021 Amit Verma, Mark Lewis

The Quadratic Unconstrained Binary Optimization (QUBO) modeling and solution framework is a requirement for quantum and digital annealers.

Decision Making

Robust Optimization of Unconstrained Binary Quadratic Problems

no code implementations21 Sep 2017 Mark Lewis, Gary Kochenberger, John Metcalfe

In this paper we focus on the unconstrained binary quadratic optimization model, maximize x^t Qx, x binary, and consider the problem of identifying optimal solutions that are robust with respect to perturbations in the Q matrix.. We are motivated to find robust, or stable, solutions because of the uncertainty inherent in the big data origins of Q and limitations in computer numerical precision, particularly in a new class of quantum annealing computers.

Decision Making Experimental Design

Quadratic Unconstrained Binary Optimization Problem Preprocessing: Theory and Empirical Analysis

1 code implementation27 May 2017 Mark Lewis, Fred Glover

The Quadratic Unconstrained Binary Optimization problem (QUBO) has become a unifying model for representing a wide range of combinatorial optimization problems, and for linking a variety of disciplines that face these problems.

Combinatorial Optimization Experimental Design

Logical and Inequality Implications for Reducing the Size and Complexity of Quadratic Unconstrained Binary Optimization Problems

no code implementations26 May 2017 Fred Glover, Mark Lewis, Gary Kochenberger

The quadratic unconstrained binary optimization (QUBO) problem arises in diverse optimization applications ranging from Ising spin problems to classical problems in graph theory and binary discrete optimization.

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