2016–17 Colloquium Series
This Colloquium Series is sponsored by the Math and Computer Science Department. Unless otherwise noted, all talks take place in Jepson Hall Room 109 at 4:00 p.m.
Starting at 3:30 p.m. light refreshments will be served in the lounge outside of Jepson 212 — please join us.
Talks will be added as they are scheduled; please check back often.
March 13 Sara Krehbiel, Assistant Professor of Computer Science, University of Richmond
March 20 Ivan Blank, Associate Professor of Mathematics, Kansas State University
April 3 Jory Denny, Assistant Professor of Computer Science, University of Richmond.
April 10 Sommer Gentry, Professor of Mathematics, United States Naval Academy.
April 17 & 19: Senior Honors Theses
Jan 30: Eric Brunvand, Associate Professor, School of Computing, University of Utah.
Title: A Tale of Two Rendering Algorithms: Ray Tracing, Rasterization, and their Supporting Hardware
Abstract: The desire for ever more complex and realistic graphics drives the computer graphics hardware industry. This interest in high-quality rendering spans the range of computer hardware from high-end gaming computers and scientific workstations to small embedded platforms such as tablets and phones. While traditional graphics rendering using a Z-buffer rasterization algorithm is well supported with commercial graphics processing units (GPUs), the desire to improve image quality encourages a new look at an alternative rendering algorithm: ray tracing. While rasterizing is used in virtually all real-time rendering applications (e.g. games that use GPUs for rendering), ray tracing software is now used in virtually all motion picture rendering because of the increased realism of the lighting in the rendered images.
Ray tracing more naturally handles a variety of optical effects that increase apparent realism in generated images, but has very different computational, I/O, memory, and power profiles than Z-buffer rasterization. As an example, traditional GPUs typically use wide Single Instruction Multiple Data (SIMD) processing to exploit the parallel behavior of Z-buffer rasterization. Ray tracing has a fundamentally different parallel character, and does not naturally map to a SIMD approach. System architectures that allow more flexibility in thread parallelism can perform much better for this type of application. In this talk I will describe and compare the rasterization algorithm that is at the core of all commercial GPUs, and the ray tracing algorithm that is not well supported on GPUs, but supports more realistic lighting in the rendered images. I will also describe the impact of using ray tracing on the design of application specific processors.
Nov. 21 Ami Radunskaya, visting professor of mathematics from Pomona College, specializes in dynamics and mathematical biology.
Title: The Sound of Chaos
Abstract: We are familiar with visual representations of functions, and often associate a particular family of functions with the shape of its graph. We also use graphs to illustrate qualitative features of dynamical systems. In the same vein, we can “listen” to a dynamical system in order to understand its structure; in fact, some features are better heard than seen. In this talk, I will demonstrate this idea by exploring the “route to chaos” via graphs and sounds. I will then explain why chaotic functions are good candidates as material for real-time, interactive performance, and then I will (hopefully) play a short piece demonstrating how this might be done.
Nov. 14 Nathan Alexander, Assistant Professor of Teacher Education, University of San Francisco.
Title: Inclusive Pedagogies in STEM+C
Abstract: This talk describes the unique challenges faced both by students and faculty with regard to inclusive teaching and learning in STEM+C (Science, Technology, Engineering, Mathematics, and Computer Science). Specifically, the speaker will engage perspectives on the interconnected nature of social categorizations and discuss research and strategies on understanding long histories of oppression, discrimination, and disadvantage. This research informs practices that are applied to collegiate STEM+C classrooms and learning environments.
At University of San Francisco, Dr. Alexander is the faculty lead at the Critical Education Content and Identity Lab (CECIL), an educational curriculum design and research laboratory for science, technology, engineering, arts and mathematics. Dr. Alexander’s teaching and research focus primarily on the relationships between mathematics, social justice and education in American contexts using historical, political, and cultural lenses.
Nov. 7 Bill Ross, Professor, Richardson Chair of Mathematics, and department chair.
Title: Matrices and the Shadows of Plato’s Cave
Abstract: In Plato’s Republic, one finds the famous Allegory of the Cave. Here Plato explains how we experience reality as shadows on a cave wall which are imperfect renditions of ideals we never really see but we know are there. In this talk, we use Plato’s Allegory to discuss how certain matrices are models (ideals) for large classes of matrices. Students have already seen certain types of model matrices, the diagonal matrices, which are the models (ideals) for the symmetric matrices. Here we expand this discussion to include other classes of matrices.
Nov. 4 Gieri Simonett, Professor of Mathematics, Vanderbilt University
Title: Moving Surfaces in Geometry and Physics
Abstract: Moving surfaces are ubiquitous in many areas of mathematics and the applied sciences. In this talk I will first introduce some well-known geometric evolution equations, and then proceed to more complicated models that describe the motion of fluids and of materials that can undergo phase transitions.
Bio: Gieri Simonett earned his PhD in Mathematics from the University of Zurich, Switzerland, in 1992. After spending three years as post-doc at UCLA, he accepted a position at Vanderbilt University, where is now a full professor Simonett is an international leader in the area of nonlinear parabolic equations and free boundary problems. He has obtained fundamental results concerning the existence, regularity, and dynamic behavior of solutions to a wide array of problems involving moving boundaries, including geometric evolution equations, phase transitions, and fluid flows. Simonett has published widely and his work has appeared in the leading journals of the field. His is the co-author of the research monograph “Moving Interfaces and Quasilinear Parabolic Evolution Equations,” published in 2016.
Oct. 24 Christian Fong, third year PhD student in the Stanford Graduate School of Business. Before Stanford, Christian earned a BSE in operations research at Princeton with minors in applied mathematics and computer science. His research focuses on the U.S. Congress, causal inference, and natural language processing.
Title: Limited Obstruction with Monopoly Agenda Setting
Abstract: In the U.S. Senate, a single senator has the ability to delay the passage of a bill even when a large majority wants the bill to pass. The Senate has the right to make its own rules, so why doesn't the Senate change its rules to streamline the process for passing bills? We present a game theoretic model of obstruction in the Senate that shows how the ability to delay the passage of bills without actually vetoing them gives minority party legislators and moderates the ability to influence the Senate's legislative agenda. A majority of the Senate prefers the resulting agenda to the bills the Senate would pass if the right to obstruction were curtailed. In a departure from the usual conventions of game theory, we find it helpful to specify the equilibrium strategies of our game's players algorithmically.
Oct. 17 Ami Radunskaya, visting professor of mathematics from Pomona College, specializes in dynamics and mathematical biology.
Title: Of Mice and Math
Abstract: The title is meant to suggest that mathematics can be a link between experimental science and practical medicine, although in reality only a few mice will actually appear in this talk. I hope to tell you a story of discovery through interdisciplinary collaboration. In particular, I will tell you about four collaborations between mathematicians and scientists at the University of Otago in Dunedin, New Zealand. These four models illustrate different modeling modalities, different mathematical techniques, and different goals.
Oct. 3 Patrick G. Traynor, R'02
Title: Who Do I Think You Are? Challenges and Opportunities in Telephony Authentication
Abstract: Telephones remain a trusted platform for bootstrapping and conducting some of our most sensitive exchanges. From banking to taxes, wide swathes of industry and government rely on telephony as a secure fall-back when attempting to confirm the veracity of a transaction. In spite of this, authentication is poorly managed between disparate telephony systems, and in the general case it is impossible to be certain of the identity of the entity at the other end of a call. In this talk, I begin with an investigation of the ways in which phone numbers are being used as strong authenticators for Internet-based systems (e.g., Caller-ID fraud, phone verified account fraud). I then detail how much stronger end-to-end mechanisms can be developed and deployed. In so doing, we argue that we can help to overcome security problems that are the direct result of such poorly placed trust.
Bio: Patrick Traynor is an Associate Professor in the Department of Computer and Information Science and Engineering (CISE) at the University of Florida. His research focuses on the security of mobile systems, with a concentration on telecommunications infrastructure and mobile devices. His research has uncovered critical vulnerabilities in cellular networks, made the first characterization of mobile malware in provider networks and offers a robust approach to detecting and combatting Caller-ID scams. He is also interested in Internet security and the systems challenges of applied cryptography. He received a CAREER Award from the National Science Foundation in 2010 and was named a Sloan Fellow in 2014. Professor Traynor earned his Ph.D and M.S. in Computer Science and Engineering from the Pennsylvania State University in 2008 and 2004, respectively, and his B.S. in Computer Science from the University of Richmond in 2002. After promotion and tenure in the School of Computer Science at Georgia Tech, he joined the University of Florida in 2014 as part of the UFRising Preeminence Hiring Program. He is the co-director of the Florida Institute for Cybersecurity (FICS) and is also a co-founder of Pindrop Security.
Oct. 5 All About Computer Science Internships. Kevin Chen, Dinc Ciftci, and Kelly Farley talk about their expereinces with summer internships in computer science.
Sept. 2: Patent awarded to Computer Science alum. Brett Csorba ’14, Information Security Software Engineer at GE, and Jake Kurzer ’10, Lead Software Engineer at Leidos, will present their patent at the next Math & Computer Science Colloquium. Their patent title is System and Method for Determining String Similarity.
Aug. 30: Student research presentations. Team mentored by Dr. Lester Caudill: Ashley Alex and Rachel Lantz. Mentored by Dr. James Davis: David Clayton. Mentored by Dr. Arthur Charlesworth: Anh Tran. Team mentored by Dr. Doug Szajda: Salar Ather, Joseph Mugisha, Rachel Culpepper, Renae Taylor, Tanner Bina, Alec Justice, & Yunwen "Nicholas" Wan. Some of the researchers can’t make it to the presentation but we wanted to list them for their work nonetheless.
Aug. 29: Student research presentations. Team mentored by Dr. Kathy Hoke and Dr. Joanna Wares: Shuyi Chen, Tatum Dam, Devika Jhunjhunwala, Sinong Li, Quinn McDonough, Harrison Wenzel, Tianyuan (Patty) Zhang, Xinyi (Julie) Zhu, Chong Hui (Devin) Chen, Camryn Travis. Team mentored by Dr. Paul Kvam: Tongyu (Stephanie) Wang and Zezhong Chen. Team mentored by Dr. Michael Kerckhove: Ying Wu, Yiwen Wang, Xiaoting (Cecelia) Sun, Joshua Hayes, Nasheya Rahman, Solomon Quinn. Some of the researchers can’t make it to the presentation but we wanted to list them for their work nonetheless.