海角社区

Department of Computer Science at UH

海角社区

Department of Computer Science

In Partial Fulfillment of the Requirements for the Degree of
Master of Science

Pengfei Guan

Will defend his thesis


Pattern Recognition of Space Plasma Regimes

Abstract

Space plasma is made of electrically charged gases or fluids in space that are made up of free electrons and ions. They are studied extensively not only to analyze the dynamic processes of stellar bodies but also to understand various phenomena including particle acceleration, wave-particle interaction, applied science of space weather and its impact on human technology. The identification of primary particles of plasma is of utmost importance for these kind of research.聽聽There is considerable聽amount of data available, deriving a formula or methods for manual plasma regime identification is extremely time consuming, and can be highly unreliable and lack robustness. An automatic process of classifying these primary particles is of high demand. Currently, existing techniques that use machine learning algorithms have difficulty in distinguishing perceptible boundaries and regions as good as the human eye. In contrast, we propose a classification method to identify plasma particles automatically given a highly diversified聽time series聽data, based on energy and pitch angle. We came up with this algorithm after exploiting various learning techniques on the entire available data.聽Experiments are reported on datasets obtained from the Fast Auroral SnapshoT (FAST) explorer, which is the second mission in NASA鈥檚 Small Explorer Satellite Program (SMEX).

 

Date: Monday, April 15, 2013
Time: 2:00 PM
Place: 350-HBS

Faculty, students, and the general public are invited.
Advisor: Dr. Ricardo Vilalta