 Скачать презентацию MEER 111 Global Research Solving Real-World Problems

• Количество слайдов: 35 MEER 111 – Global Research Solving Real-World Problems with Evolutionary Algorithms Daniel Tauritz, Ph. D. Associate Professor of Computer Science Algorithm An algorithm is a sequence of well-defined instructions that can be executed in a finite amount of time in order to solve some problem. Optimization Algorithm An optimization algorithm is an algorithm which takes as input a solution space, an objective function which maps each point in the solution space to a linearly ordered set, and a desired goal element in the set. Stochastic Algorithm A stochastic algorithm is an algorithm which when executed multiple times with the same input, produces different outputs drawn from some underlying probability distribution. Evolutionary Algorithm A stochastic optimization algorithm inspired by genetics and natural evolution theory.  Deriving Gas-Phase Exposure History through Computationally Evolved Inverse Diffusion Analysis • Joshua M. Eads • Former undergraduate student in Computer Science • Daniel Tauritz • Associate Professor of Computer Science • Glenn Morrison • Associate Professor of Environmental Engineering • Ekaterina Smorodkina • Former Ph. D. Student in Computer Science Introduction Find Contaminants and Fix Issues Examine Indoor Exposure History Unexplained Sickness Background • Indoor air pollution top five environmental • • • health risks \$160 billion could be saved every year by improving indoor air quality Current exposure history is inadequate A reliable method is needed to determine past contamination levels and times Problem Statement • A forward diffusion differential equation predicts concentration in materials after exposure • An inverse diffusion equation finds the timing and intensity of previous gas contamination • Knowledge of early exposures would greatly strengthen epidemiological conclusions Gas-phase concentration history and material absorption Proposed Solution • Use Genetic Programming (GP) as a directed search for inverse equation • Fitness based on x^5 + x^4 - tan(y) / pi x^2 + sin(x) sin(cos(x+y)^2) sin(x+y) + e^(x^2) 5 x^2 + 12 x - 4 x^2 - sin(x) X + Sin / forward equation ? Related Research • It has been proven that the inverse • • equation exists Symbolic regression with GP has successfully found both differential equations and inverse functions Similar inverse problems in thermodynamics and geothermal research have been solved Interdisciplinary Work • Collaboration between Environmental Engineering, Computer Science, and Math Parent Selection Candidate Solutions Competition Population Reproduction Fitness Genetic Programming Algorithm Forward Diffusion Equation Genetic Programming Background + Y = X^2 + Sin( X * Pi ) Si n * X X * X Pi Summary • Ability to characterize exposure history will enhance ability to assess health risks of chemical exposure Coevolutionary Automated Software Correction (CASC) ISC Sponsored Project Ph. D. student: Josh Wilkerson Objective: Find a way to automate the process of software testing and correction. Approach: Create Coevolutionary Automated Software Correction (CASC) system which will take a software artifact as input and produce a corrected version of the software artifact as output.  Coevolutionary Cycle Population Initialization Population Initialization Population Initialization Population Initialization Initial Evaluation Initial Evaluation Reproduction Phase Reproduction Phase Reproduction Phase Evaluation Phase Evaluation Phase Competition Phase Competition Phase Termination Termination 