As chair of the CSUN Mathematics Department, it is my great pleasure to welcome all of you to this special occasion: our annual department open house.

I would especially like to highlight our student research presentations. These presentations illustrate the many and varied opportunities that the Math Department offers both our undergraduate and graduate students. Research experience is becoming an increasingly important facet of the scientific training of students, and our department is helping to lead the way so as to prepare our students for 21^{st} century challenges.

I would also like to call your attention to the three afternoon panels made up of several of our former students, who have volunteered to describe how their education at CSUN enhanced their academic and professional careers. The lion’s share of credit, of course, goes to the students themselves – both our current and former students - but the roles of our talented and dedicated faculty should also not be overlooked. Two of our faculty will provide an overview of their research activities. You will see that they are working on a broad range of cutting-edge projects.

We hope that you will be able to attend as many sessions as you can throughout the day. We have an information session where you can ask questions and learn all about our department programs. If you stop by during the intermission, right after the student research presentations, you can enjoy music provided by a blues band that includes three CSUN mathematicians.

The pandemic imposed some restrictions on our interactions. It has forced us to take special measures to remain physically separated, and to rely on the internet and innovative technologies to teach and communicate ideas. Thanks to the efforts of our hardworking and extraordinary staff, our department doors have remained open remotely, providing the care and support our students need under these unique circumstances. We hope that this event will bring us together even more to applaud the accomplishments of our students and faculty and to share some of the wonderful opportunities that our department has to offer.

Thank you again for joining us today. I hope that you find your time here enjoyable and illuminating.

*Rabia Djellouli*

Department Chair

**Presenters**

*Associate Professor of Mathematics*

**Modeling Waning and Boosting of COVID-19 in Canada with Vaccination**

*Several vaccination policy-making bodies, including the Government of Canada’s National Advisory Committee on Immunization (NACI), have solicited transmission modeling studies to evaluate possible strategies for allocating vaccines against SARS-CoV-2. Most models of the transmission of SARS-CoV-2 are modifications of a classic model in population biology in which the host population is partitioned into those who are susceptible to infection; infected, but not yet infectious; infectious; and removed from the process to include features of the biology of COVID-19 that might affect transmission (e.g., pre- and asymptomatic infections, hospitalization of some with symptomatic infections, vaccination, mortality, and waning of immunity). We have used a model with some of these features that however emphasizes the waning and boosting of immunity and relationship between immunity when infected and disease to answer some of the questions posed by the NACI. *

David Klein

*Professor of Mathematics*

**Climate Models & the Climate Crisis: An Overview**

*A brief introduction to the mathematics of climate science and the magnitude of the climate crisis will be given. Questions about what to expect in the future, and what can be done will also be addressed. *

Faculty Session Chair

## Emmanuel Yomba

*Professor of Mathematics*

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**Jerry Rosen**

Professor of Mathematics

**John Sikora**

BA in Pure Mathematics, CSUN 2005

MS in Mathematics, CSUN 2008

**Greg Imhoff**

MS in Mathematics, CSUN 2013

**Sam McAdam**