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Events for February 26, 2018
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Chia Wei Hsu, Monday, February 26th at 12:00pm noon in EEB 132
Mon, Feb 26, 2018 @ 12:00 PM - 01:30 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Chia Wei Hsu, Department of Applied Physics, Yal University
Talk Title: New Frontiers of Electromagnetic Phenomena at the Nanoscale
Abstract: Optics and photonics today enjoy unprecedented freedom. The ability to synthesize arbitrary light fields (through wavefront shaping) and the ability to design structures at the subwavelength scale (through nanofabrication) enable us to realize exciting new phenomena that were not accessible in the past. In this talk, I will present several such experiments and related theory.
It is commonly thought that waves cannot be perfectly confined within the continuum spectrum of an open system. I will describe the first realization of "bound states in the continuum" that defy such conventional textbook wisdom [1] as well as their underlying topological nature [2]. This new way to confine light enables novel lasers, filters, and sensors [3].
I will show that by tailoring the radiation of optical modes, we can realize non-Hermitian photonic band structures with no counterpart in closed Hermitian systems, such as rings of exceptional points [4] and pairs of exceptional points connected by bulk Fermi arcs [5].
By designing light fields, we can control wave transport even through unknown disordered structures. I will show that the multiple scattering of light leads to correlations between far-away photons [6] and that using such correlations, we can simultaneously control orders of magnitudes more degrees of freedom than what was previously thought to be possible [7].
I will conclude with my visions for new opportunities enabled by designed light fields and optical structures, including new paradigms for imaging and optical computing that have the potential to go beyond the current state of the art by orders of magnitude.
[1] C. W. Hsu*, B. Zhen* et al., Nature 499, 188 (2013).
[2] B. Zhen*, C. W. Hsu* et al., Phys. Rev. Lett. 113, 257401 (2014).
[3] C. W. Hsu*, B. Zhen* et al., Nature Reviews Materials 1, 16048 (2016).
[4] B. Zhen*, C. W. Hsu* et al., Nature 525, 354 (2015).
[5] H. Zhou et al., Science, eaap9859 (2018).
[6] C. W. Hsu et al., Phys. Rev. Lett. 115, 223901 (2015).
[7] C. W. Hsu et al., Nature Physics 13, 497 (2017).
Biography: Wade is a postdoc at Yale applied physics. He received his PhD in physics from Harvard in 2015 and BS in physics with high honors from Wesleyan in 2010. His research centers around controlling light in nanoscale structures and complex systems, through a combination of experiment and theory. He is the co-author of 32 peer-reviewed journal articles and the co-inventor of 3 patents, and has delivered over a dozen invited talks internationally. He won the LeRoy Apker Award given by the American Physical Society and was a finalist for the Blavatnik Regional Award for Young Scientists.
Host: EE-Electrophysics
Location: Hughes Aircraft Electrical Engineering Center (EEB) - 132
Audiences: Everyone Is Invited
Contact: Marilyn Poplawski
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Biomedical Engineering Seminars
Mon, Feb 26, 2018 @ 12:30 PM - 01:50 PM
Alfred E. Mann Department of Biomedical Engineering
Conferences, Lectures, & Seminars
Speaker: Donald Schwartz, MD, President
Talk Title: TBA
Host: Professor Qifa Zhou
Location: Olin Hall of Engineering (OHE) - 122
Audiences: Everyone Is Invited
Contact: Mischalgrace Diasanta
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Biomedical Engineering Department Guest Speaker
Mon, Feb 26, 2018 @ 01:00 PM - 02:00 PM
Alfred E. Mann Department of Biomedical Engineering
Conferences, Lectures, & Seminars
Speaker: Lyle Muller, Postdoctoral Fellow, Computational Neurobiology Laboratory, Salk Institute for Biological Studies
Talk Title: Traveling waves in cortex: spatiotemporal dynamics shape perceptual and cognitive processes
Abstract: With new multichannel recording technologies, neuroscientists can now record from cortex with high spatial and temporal resolution. Early recordings during anesthesia revealed spontaneous and stimulus-evoked waves traveling across the cortex. While for a long time these waves were thought to disappear in awake animals and during normal sleep, our recent work has revealed traveling waves in these complex activity states. Their overall role in neural computation, however, remains poorly understood.
In my research, we have introduced new computational methods for detection and quantification of spatiotemporal patterns in noisy multisite recordings. At the scale of a single cortical region, these methods have revealed that small visual stimuli consistently evoke waves traveling from the point of input to primary visual cortex in the awake monkey (Muller et al., Nature Communications 5, 2014). At the whole-brain scale, the 11-15 Hz sleep "spindle", a brain oscillation causally implicated in consolidation of long-term memory, is consistently organized as a rotating wave traveling in a preferred direction (Muller et al., eLife 5, 2016). These results indicate that traveling waves play a role in organizing neural activity during multiple behavioral states. In upcoming work, we aim to address the network-level mechanisms generating traveling waves and complex spatiotemporal patterns, under the general aim of understanding their role in neural computation.
Hosted by:
Host: Francisco Valero-Cuevas, PhD
Location: Corwin D. Denney Research Center (DRB) - 145/145A
Audiences: Everyone Is Invited
Contact: Mischalgrace Diasanta
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Center for Systems and Control (CSC@USC) and Ming Hsieh Institute for Electrical Engineering
Mon, Feb 26, 2018 @ 02:00 PM - 03:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Frank Doyle, Harvard University
Talk Title: Controlling the Artificial Pancreas
Abstract: Type 1 diabetes mellitus (T1DM) is a chronic autoimmune disease affecting approximately 35 million individuals world-wide, with associated annual healthcare costs in the US estimated to be approximately $15 billion. Current treatment requires either multiple daily insulin injections or continuous subcutaneous (SC) insulin infusion (CSII) delivered via an insulin infusion pump. Both treatment modes necessitate frequent blood glucose measurements to determine the daily insulin requirements for maintaining near-normal blood glucose levels.
More than 30 years ago, the idea of an artificial endocrine pancreas for patients with type 1 diabetes mellitus (T1DM) was envisioned. The closed-loop concept consisted of an insulin syringe, a blood glucose analyzer, and a transmitter. In the ensuing years, a number of theoretical research studies were performed with numerical simulations to demonstrate the relevance of advanced process control design to the artificial pancreas, with delivery algorithms ranging from simple PID, to fuzzy logic, to H-infinity, to model predictive control. With the advent of continuous glucose sensing, which reports interstitial glucose concentrations approximately every minute, and the development of hardware and algorithms to communicate with and control insulin pumps, the vision of closed-loop control of blood glucose is approaching a reality.
In the last 15 years, our research group has been working with medical doctors on clinical demonstrations of feedback control algorithms for the artificial pancreas. In this talk, I will outline the difficulties inherent in controlling physiological variables, the challenges with regulatory approval of such devices, and will describe a number of process systems engineering algorithms we have tested in clinical experiments for the artificial pancreas.
Biography: Frank Doyle is the John A. Paulson Dean of the Paulson School of Engineering and Applied Sciences at Harvard University, where he also is the John A. & Elizabeth S. Armstrong Professor. Prior to that he was the Mellichamp Professor at UC Santa Barbara, where he was the Chair of the Department of Chemical Engineering, the Director of the UCSB/MIT/Caltech Institute for Collaborative Biotechnologies, and the Associate Dean for Research in the College of Engineering. He received a B.S.E. degree from Princeton, C.P.G.S. from Cambridge, and Ph.D. from Caltech, all in Chemical Engineering. He has also held faculty appointments at Purdue University and the University of Delaware, and held visiting positions at DuPont, Weyerhaeuser, and Stuttgart University. He has been recognized as a Fellow of multiple professional organizations including: IEEE, IFAC, AIMBE, and the AAAS. He was the President for the IEEE Control Systems Society in 2015, and is the Vice President of the International Federation of Automatic Control. In 2005, he was awarded the Computing in Chemical Engineering Award from the AIChE for his innovative work in systems biology, and in 2015 received the Control Engineering Practice Award from the American Automatic Control Council for his development of the artificial pancreas. In 2016, he was inducted as a Fellow into the National Academy of Medicine for his work on biomedical control. His research interests are in systems biology, network science, modeling and analysis of circadian rhythms, and drug delivery for diabetes.
Host: Mihailo Jovanovic, mihailo@usc.edu
More Information: Doyle.png
Location: Hughes Aircraft Electrical Engineering Center (EEB) - 132
Audiences: Everyone Is Invited
Contact: Gerrielyn Ramos
