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Department of Mathematics and Computer Science

Keynote Speakers
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Dr. Doğan Çömez to Speak On The Mathematics of Modern Communication

Doğan Çömez studied mathematics at the Middle East Technical University in Ankara, Turkey, and received his PhD degree in mathematics from the University of Toronto, Ontario, Canada. Following a two year teaching experience in his alma mater, he joined the Department of Mathematics at North Dakota State University in 1985.  His main research interest is in dynamical systems and operator ergodic theory, particularly on the convergence of additive or superadditive processes and ergodic Hilbert transform.  He has also been involved in various interdisciplinary research collaborations in pharmaceutical science, in operations research, and in mathematics and science education.  He has made numerous mathematical presentations for the 4-H Club, the Kiwanis Club, Sonya Kovalevski Math Days and the North Dakota Governor’s School. He is a leading advocate for departmental programs aimed to attract students to Science and Mathematics. He is currently the director of the GraSUS Program (originally NSF-funded, currently institutionalized at NDSU) that places graduate students in local high schools, and the ND-PRIME Project (funded by North Dakota State DPI) that provides professional development for K-12 mathematics teachers.

ABSTRACT: Many simple, seemingly ordered, physical systems exhibit unpredictable behavior if the initial condition is slightly altered. Such systems are called chaotic. Over the years, mathematicians developed numerous techniques while trying to understand and analyze chaotic systems. As a consequence, not only we have quite a good insight of chaotic systems, the tools developed for this purpose enabled mathematicians to study many other complicated dynamical systems (modeling various physical phenomena) as well as to discover and study new type of dynamical systems. In this talk, I will develop some of these tools and concepts using simple examples and provide some interesting applications into fractal systems. The talk is accessible to anyone who has a basic understanding of linear algebra and properties of the real number system.



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Dr. Joel Iiams to Speak On Vanilla, Crunch, Separation Anxiety, and Survivors

Joel Iiams started his academic career at what was then Mesa State College. He then spent the next nine years at Colorado State University. He earned his PhD under the guidance of Robert A. Liebler. He has been a member of the mathematics department at UND since 1995. He is currently a full professor and chair of the department. He is a 25-year member of the Mathematical Association of America and is currently serving as President of the North Central Section.

ABSTRACT:The mathematics in this talk came about from a strange sequence of events. It began with a series of poker games I participated in while I was in graduate school. It so happens that that is where I met the boss, my wife. Next, I was repeatedly assigned to teach Math208 - Discrete Mathematics. Here I began to perfect the _ne art of student torture - which most people call teaching. Finally, I had the dubious pleasure of playing poker with a particular electrical engineer. The moral of the story is: Be careful who you play poker with.

Invited Speakers
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Place Photo Dr. Takayuki Yamauchi to Speak On Comprehensive Rigorous Explanations of Unbounded Functions: from College Algebra to Real Analysis

Taka Yamauchi is currently a tenured assistant professor of mathematics at Valley City State University (since 2007). He studied mathematics and physics at Michigan Tech and U.C. Berkeley as an undergraduate, and earned M.A at Western Michigan University, M.S at Michigan Tech, M.A and Ph.D in Mathematics at Johns Hopkins in 1996. He then was a research associate at the Dept. of Chemical Engineering of Johns Hopkins, a research associate at Ryuka Patent Law Firm, a research associate at the Dept. of Computer Engineering of University of Delaware, a visiting assistant professor of mathematics at SUNY Oswego, an assistant professor of mathematics at DePauw University, and an assistant professor of mathematics at Lincoln University. He has publications in the mathematics of nuclear fusion, Lagrange Multiplier Rule in the context of continuous equi-measurable rearrangements of functions and optimization theory, and the constructability of constant mean curvature surfaces in hyperbolic 3-space. He has also been doing research in innovation-based teaching efficiency maximization methods. He has established a self-contained math teaching method that does not require students to read the text at all. Mathematical Theory of Mechanism of Innovation in Math-Teaching

ABSTRACT: No text of College Algebra and Pre-calculus provides a comprehensive rigorous explanation of unbounded functions. In Calculus, Advanced Calculus, and Real Analysis, unbounded functions are usually defined abstractly without using tangible computational methods. In this presentation, using a simple example, the behavior of a rational function near a vertical asymptote is explained in a comprehensive manner that is understandable to students in College Algebra, Calculus, Advanced Calculus, and Real Analysis.



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Dr. Dilip C. Ghimire to speak on Photovoltaic properties of a-C thin films deposited by microwave surface-wave plasma CVD

Dr. Dilip Chandra Ghimire received his PhD in electrical and electronics engineering at Chubu University, Japan where he completed his dissertation on Fabrication and Characterization of Carbon thin films for Clean Energy and Environment. He is a reviewer of the following journals: Materials Chemistry and Physics, International Journal of Physical Sciences, and Japanese Journal of applied physics. Dr. Ghimire has many published articles, presented several invited talks and conference presentations including at OU-BTCHURI a national Japanese conference. Currently he is a professor at Chubu University, Japan.

ABSTRACT: We report the photovoltaic properties of amorphous carbon (a-C) thin films by MW surface-wave plasma chemical vapor deposition (SWP-CVD) system at various temperature (<550 oC). This technique is noble for deposit carbon thin films without corroding ions on substrate, the properties of a-C thin films deposited by this technique have been reported elsewhere [1, 2]. For film deposition, we used argon (Ar) as a carrier gas, methane (CH4) and ethylene (C2H4), acetylene (C2H2) for carbon source gases and nitrogen ,phosphine, boron are used as a dopant gas for making n-type, i-type and p-type carbons. The optical and structural properties of a-C thin films were studied by ultraviolet-visible (UV-VIS) spectroscopy, Raman spectroscopy, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy ( SEM), high resolution transmission electron microscopy (HR-TEM) and atomic force microscopy (AFM) measurements.
Place Photo Fig. 1 shows the raman and HR-TEM image and Raman result of a-C films prepared at 550oC. It was found that graphene are found in the carbon films with increasing deposition temperature. The Raman results conforms the films are graphitic carbon. The surface I-V characteristics of the device shows good photovoltaic response with 4.0 % efficiency in n-Si substrate. Details of the experimental results and discussion will be presented during the conference presentation.



References
1. K. M. Krishna, M. Umeno, et. al., Appl. Phys. Lett. 77, 1472 (2000).
2. Dilip. C. Ghimire M. Umeno, et. al. Diamond Relat. Mater. 17 (2008) pp.1724 -1727.