Dear the Third Oklahoma PDE Workshop orgnizers, I am writing to apply for giving a poster presentation in the upcoming workshop. I am a graduate student at the University of Oklahoma working on a dissertation under Dr. Semion Gutman. My research interests include nonliear functional analysis, differential equations, optimization and inverse problems. My contact informatin is the following: Qinghua Luo the University of Oklahoma, Department of Mathematics, 601 Elm Avenue, PHSC 423 Norman, OK 73019 Attached is the abstract of my poster. Thank you very much for your consideration and I look forward to hearing from you. Sincerely yours, Qinghua Luo