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DTSTART;TZID=America/New_York:20191203T103000
DTEND;TZID=America/New_York:20191203T120000
DTSTAMP:20260408T150742
CREATED:20191108T144015Z
LAST-MODIFIED:20191108T144015Z
UID:10006330-1575369000-1575374400@seasevents.nmsdev7.com
SUMMARY:MEAM Seminar: "Physics-Informed Neural Networks (PINNs) for Physical Problems & Biological Problems"
DESCRIPTION:We will present a new approach to develop a data-driven\, learning-based framework for predicting outcomes of physical and biological systems and for discovering hidden physics from noisy data. We will introduce a deep learning approach based on neural networks (NNs) and generative adversarial networks (GANs). We also introduce new NNs that learn functionals and nonlinear operators from functions and corresponding responses for system identification. Unlike other approaches that rely on big data\, here we “learn” from small data by exploiting the information provided by the physical conservation laws\, which are used to obtain informative priors or regularize the neural networks. We will also make connections between Gauss Process Regression and NNs and discuss the new powerful concept of meta-learning. We will demonstrate the power of PINNs for several inverse problems in fluid mechanics\, solid mechanics and biomedicine including wake flows\, shock tube problems\, material characterization\, brain aneurysms\, etc\, where traditional methods fail due to lack of boundary and initial conditions or material properties.
URL:https://seasevents.nmsdev7.com/event/meam-seminar-physics-informed-neural-networks-pinns-for-physical-problems-biological-problems/
LOCATION:Wu and Chen Auditorium (Room 101)\, Levine Hall\, 3330 Walnut Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Seminar
ORGANIZER;CN="Mechanical Engineering and Applied Mechanics":MAILTO:meam@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191202T120000
DTEND;TZID=America/New_York:20191202T130000
DTSTAMP:20260408T150742
CREATED:20190919T185009Z
LAST-MODIFIED:20190919T185009Z
UID:10006296-1575288000-1575291600@seasevents.nmsdev7.com
SUMMARY:PSOC Seminar : 'Deconstructing tumor architecture'
DESCRIPTION:
URL:https://seasevents.nmsdev7.com/event/psoc-seminar-deconstructing-tumor-architecture/
LOCATION:Room 337\, Towne Building\, 220 South 33rd Street\, Philadelphia\, PA\, 19104\, United States
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191126T110000
DTEND;TZID=America/New_York:20191126T120000
DTSTAMP:20260408T150742
CREATED:20191014T134823Z
LAST-MODIFIED:20191014T134823Z
UID:10006315-1574766000-1574769600@seasevents.nmsdev7.com
SUMMARY:ESE Seminar: "Management Strategies for Hyperscale Datacenters"
DESCRIPTION:Abstract: Hyperscale datacenters provide critical infrastructure for the information economy\, refining data to extract value. Sharing datacenters improves energy efficiency but whether strategic users participate depends on management policies. I address these challenges by integrating practical insights from computer architecture with rigorous methods in algorithmic economics and machine learning. I illustrate this approach for power allocation and performance diagnosis. First\, I allocate server power by anticipating strategic behavior and incentivizing participation. I design mechanisms in which users selfishly draw power to boost performance yet avoid oversubscribing the shared supply. Second\, I diagnose performance anomalies by inferring interpretable causal relationships. I design statistical frameworks that learn performance models and extract recurring semantic structure from these models with natural language processing. Finally\, I conclude by describing future directions for efficient and secure architectures in datacenters and beyond.
URL:https://seasevents.nmsdev7.com/event/ese-seminar-benjamin-lee/
LOCATION:PICS Conference Room 534 – A Wing \, 5th Floor\, 3401 Walnut Street\, Philadelphia\, PA\, 19104\, United States
ORGANIZER;CN="Electrical and Systems Engineering":MAILTO:eseevents@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191126T103000
DTEND;TZID=America/New_York:20191126T120000
DTSTAMP:20260408T150742
CREATED:20190924T190845Z
LAST-MODIFIED:20190924T190845Z
UID:10006300-1574764200-1574769600@seasevents.nmsdev7.com
SUMMARY:MEAM Seminar: "Micro/Nanomanufacturing of 3D Functional Coatings via Self-Limiting Electrospray Deposition"
DESCRIPTION:Recent developments in nanostructured materials have demonstrated myriad desirable properties ranging from optical and mechanical metamaterials to biomanipulative surfaces. To bring these properties from the lab to the commercial space will require innovative nanomanufacturing strategies focused on scalable and cost-effective techniques. My lab\, the Hybrid Micro/Nanomanufacturing Laboratory\, applies the manipulation of fundamental driving forces to this challenge through combinations of top-down and bottom-up techniques for new hybrid lithographic strategies. In this seminar\, I will highlight one such strategy: self-limiting electrospray deposition (SLED) of thin film microcoatings. Electrospray deposition is a well-established technique for the creation of thin films from the spray of highly charged droplets loaded with the materials to be deposited. In SLED\, specific manipulation of the electrostatic repulsion\, hydrodynamic forces\, and evaporation kinetics can be employed to conformally cover 3D architectures with microcoatings. The generated coatings are hierarchical\, possessing either nanoshell or nanowire microstructure. Having demonstrated the mechanism of the self-limiting effect\, we have developed the ability to employ materials that would be otherwise incompatible with self-limiting. In this way we have incorporated a wide variety of functional systems\, including: (1) biocompatible\, (2) plasmonic\, (3) elastomerically-toughened composite\, (4) anti-corrosive epoxy or sol gel\, and (5) electrically conductive coatings. We have also characterized the geometric limits of features that can be coated through this approach\, showing that the 3D capabilities increase with decreasing feature size to the micron-scale. This property\, combined with the hierarchical structure of the coatings\, shifts the burden of micro/nanoscale resolution from a costly or slow technique to a more scalable method\, thereby removing barriers for integration into advanced manufacturing techniques such as roll-to-roll or additive manufacturing.
URL:https://seasevents.nmsdev7.com/event/meam-seminar-micro-nanomanufacturing-of-3d-functional-coatings-via-self-limiting-electrospray-deposition/
LOCATION:Glandt Forum\, Singh Center for Nanotechnology\, 3205 Walnut Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Colloquium
ORGANIZER;CN="Mechanical Engineering and Applied Mechanics":MAILTO:meam@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191125T150000
DTEND;TZID=America/New_York:20191125T170000
DTSTAMP:20260408T150742
CREATED:20191016T195431Z
LAST-MODIFIED:20191016T195431Z
UID:10006319-1574694000-1574701200@seasevents.nmsdev7.com
SUMMARY:CBE Dissertation Defense: "Fabrication of Superhydrolic Nanostructured Membranes for Oil/Water Separation
DESCRIPTION:Committee: Daeyeon Lee\, PhD and Shu Yang\, PhD\, Co-Advisors; Kathleen Stebe\, PhD and Amish Patel\, PhD
URL:https://seasevents.nmsdev7.com/event/cbe-dissertation-defense-fabrication-of-superhydrolic-nanostructured-membranes-for-oil-water-separation/
LOCATION:LRSM REading Room 106/107
CATEGORIES:Doctoral,Student,Dissertation or Thesis Defense
ORGANIZER;CN="Chemical and Biomolecular Engineering":MAILTO:cbemail@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191125T110000
DTEND;TZID=America/New_York:20191125T123000
DTSTAMP:20260408T150742
CREATED:20191119T150621Z
LAST-MODIFIED:20191119T150621Z
UID:10006339-1574679600-1574685000@seasevents.nmsdev7.com
SUMMARY:ESE Thesis Defense: Zhe Xuan
DESCRIPTION:Title: “Towards Advanced Photonic Integrated Systems through Electronic-Assisted Design” \nAbstract: Optical systems have applications ranging from traditional areas such as communication and spectroscopy to emerging fields such as quantum computing and cryptography. Bench-top optical systems\, using free-space optics or fiber optics with standalone devices\, have been successful. However\, they tend to occupy a large space and are costly to build. With the advance of the photonic integrated circuit\, many of those systems are being integrated on-chip\, promising portable and energy-efficient implementations with orders of magnitude reduction in cost and volume. Similar to the scaling of the electronics\, the scaled photonic devices also give rise to better device performance and eventually better system performance. In this work\, I will leverage the bandwidth\, the low latency and phase coherence of the photonic integrated circuit\, in combination with the processing power and the control capabilities of the electronic integrated circuit\, to enable new functionalities and new architectures of the optical systems. \nDissertation Committee: \nChair: Prof. Jan Van der Spiegel\nSupervisor: Prof. Firooz Aflatouni\nMember: Prof. Nader Engheta\nMember: Prof. Bo Zhen
URL:https://seasevents.nmsdev7.com/event/ese-thesis-defense-zhe-xuan/
LOCATION:Room 307\, Levine Hall\, 3330 Walnut Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Dissertation or Thesis Defense
ORGANIZER;CN="Electrical and Systems Engineering":MAILTO:eseevents@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191122T140000
DTEND;TZID=America/New_York:20191122T150000
DTSTAMP:20260408T150742
CREATED:20190923T144253Z
LAST-MODIFIED:20190923T144253Z
UID:10006298-1574431200-1574434800@seasevents.nmsdev7.com
SUMMARY:PICS Seminar: "Molecular Simulation and Machine Learning as Routes to Exploring Structure and Phase Behavior in Atomic and Molecular Crystals"
DESCRIPTION:Abstract: Organic molecular crystals frequently exist in multiple forms known as polymorphs. Structural differences between crystal polymorphs can affect desired properties\, such as bioavailability of active pharmaceutical formulations\, lethality of pesticides\, or electrical conductivity of organic semiconductors. Crystallization conditions can influence polymorph selection\, making an experimentally driven hunt for polymorphs difficult. Such efforts are further complicated when polymorphs initially obtained under a particular experimental protocol “disappear” in favor of another polymorph in subsequent repetitions of the experiment. Consequently\, theory and computational can potentially play a vital role in mapping the landscape of crystal polymorphism. Traditional crystal structure prediction methods face their own challenges\, and therefore\, new approaches are needed. In this talk\, I will show\, by leveraging concepts from mathematics and statistical mechanics in combination with techniques of molecular simulation\, traditional methods\, and machine learning\, that a new paradigm in crystal structure prediction may be emerging. Examples demonstrating prediction of structures of crystals\, co-crystals\, and phase transitions will be presented.
URL:https://seasevents.nmsdev7.com/event/pics-seminar-molecular-simulation-and-machine-learning-as-routes-to-exploring-structure-and-phase-behavior-in-atomic-and-molecular-crystals/
LOCATION:PICS Conference Room 534 – A Wing \, 5th Floor\, 3401 Walnut Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Colloquium
ORGANIZER;CN="Penn Institute for Computational Science (PICS)":MAILTO:dkparks@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191121T150000
DTEND;TZID=America/New_York:20191121T160000
DTSTAMP:20260408T150742
CREATED:20191114T135643Z
LAST-MODIFIED:20191114T135643Z
UID:10006334-1574348400-1574352000@seasevents.nmsdev7.com
SUMMARY:CIS Seminar: " Flash Boys 2.0: Frontrunning\, Transaction Reordering\, and Consensus Instability in Decentralized Exchanges"
DESCRIPTION:Abstract: \nCryptocurrencies and blockchains are often heralded as the keys to a new era of financial transparency and fairness. Decentralized exchanges (DEXes)\, in particular\, run directly on blockchains. They manage custody of traded assets\, preventing theft by exchange operators\, and provide a globally visible and accessible trading platform that seems egalitarian. \nOur research\, though\, has revealed that DEXes are in rife with Wall-Street-like manipulation—and worse. Arbitrage bots\, automated trading programs written as smart contracts\, continuously exploit DEXes to profit at the expense of ordinary users. I’ll talk about the increasingly sophisticated strategies used by arbitrage bots\, where their gains come from\, and how game-theoretic modeling closely reflects their real-world behavior. I’ll also recount their rise as an inadvertent side-effect of our research. \nDEX arbitrage doesn’t just impact DEX users\, but is suggestive of widespread malfeasance in cryptocurrency exchanges and also poses an unexpected\, systemic threat to the foundational stability of blockchains such as Ethereum today.
URL:https://seasevents.nmsdev7.com/event/cis-seminar/
LOCATION:Wu and Chen Auditorium (Room 101)\, Levine Hall\, 3330 Walnut Street\, Philadelphia\, PA\, 19104\, United States
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191121T120000
DTEND;TZID=America/New_York:20191121T130000
DTSTAMP:20260408T150742
CREATED:20191111T201454Z
LAST-MODIFIED:20191111T201454Z
UID:10006332-1574337600-1574341200@seasevents.nmsdev7.com
SUMMARY:BE Seminar: "Nanofluidic Technologies for Biomolecule Manipulation"
DESCRIPTION:In the last 20 years\, microfabrication techniques have allowed researchers to miniaturize tools for a plethora of bioanalytical applications.  In addition to better sensitivity\, accuracy and precision\, scaling down the size of bioanalytical tools has led to the exploitation of new technologies to further manipulate biomolecules in ways that has never before been achieved. For example\, when microfluidic channels are on the same order of magnitude of the electric double layers that form due to localized charge at the surfaces\, there exists unique physics that create different flow phenomenon\, such as analyte concentration and/or separation\, mainly due to the couples physics of electrostatics and fluid dynamics. This talk will outline the basis of such interesting phenomena\, such as nanofluidic  separation and concentration\, and well as probe the applications of such coupled systems\, for example\, handheld DNA detection. Most importantly\, we will focus on the most recent work in the Pennathur lab in this field —  biopolar electrode (BPE)-based phenomenon. Bipolar electrodes (BPE) have been studied in microfluidic systems over the past few decades\, and through rigorous experimentally-validated modeling of the rich combined physics of fluid dynamics\, electrokinetics\, and electrochemistry at BPEs\, I will show the potential of utilizing microfluidic-based BPEs for the design and development of low power\, accurate\, low volume fluid pumping mechanisms\, with the ultimate goal of integration into wearable drug delivery and µTAS systems.
URL:https://seasevents.nmsdev7.com/event/be-seminar-nanofluidic-technologies-for-biomolecule-manipulation/
LOCATION:PICS Conference Room 534 – A Wing \, 5th Floor\, 3401 Walnut Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191121T104500
DTEND;TZID=America/New_York:20191121T114500
DTSTAMP:20260408T150742
CREATED:20191115T171050Z
LAST-MODIFIED:20191115T171050Z
UID:10006336-1574333100-1574336700@seasevents.nmsdev7.com
SUMMARY:MSE Seminar: "Exploring Photonic Materials with Symmetry and Topology"
DESCRIPTION:Symmetry and topology are fundamental notions existing in all kinds of natural systems\, from spiral galaxies and hurricanes to amino acids in molecules and non-trivial topologically protected electronic states in condensed matter. A stream of photons is typically topologically trivial\, nevertheless\, its full-vector nature intrinsically endows light with full capability of creating and carrying unique symmetry and topology\, especially non-Hermitian symmetries that cannot be easily implemented in condensed matter. Explorations of symmetry and topology on a photonic platform not only deepen our understanding of fundamental physics\, but also enable novel material properties to facilitate technological breakthroughs for photonic applications. In this seminar\, I will present our recent efforts on investigating the complex optical potentials with the non-Hermitian parity-time symmetry for the next generation of optical communication and information technology. We demonstrated an orbital angular momentum (OAM) microlaser that structures and twists the lasing radiation at the microscale\, which can provide an additional OAM-based information dimension to meet the growing demand for information capacity. By strategically interfacing non-Hermitian photonic materials and topological physics\, we realized the dynamic control of robust topological transmission links of light inside the bulk of a photonic topological insulator\, routing optical signals in a highly flexible and scalable manner.
URL:https://seasevents.nmsdev7.com/event/mse-seminar-exploring-photonic-materials-with-symmetry-and-topology/
LOCATION:Auditorium\, LRSM Building\, 3231 Walnut Street\, Philadelphia\, PA\, 19104\, United States
ORGANIZER;CN="Materials Science and Engineering":MAILTO:johnruss@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191120T150000
DTEND;TZID=America/New_York:20191120T160000
DTSTAMP:20260408T150742
CREATED:20190729T192818Z
LAST-MODIFIED:20190729T192818Z
UID:10006252-1574262000-1574265600@seasevents.nmsdev7.com
SUMMARY:CBE Seminar: "Soft\, Wet\, and Sticky: Viscous Forces and Elasticity in Wet Adhesion”
DESCRIPTION:Abstract: \nUnderstanding and harnessing the coupling between lubrication pressure\, elasticity\, and surface interactions provides materials design strategies for applications such as adhesives\, coatings\, microsensors\, and biomaterials. This presentation will discuss our efforts to understand how soft materials make contact and adhere under dynamic conditions in fluid environments. Measurements of interactions between soft surfaces will show how elastic films deform due to viscous forces and influence adhesion. In particular\, we will discuss conditions under which elasticity favors both dynamic and static adhesion in fluid environments. In the second part of the presentation\, we will show practical implications for adhesives on soft surfaces such as skin. More specifically\, we will discuss how the presence of water influences contact formation and the performance of adhesives. We will also show qualitative differences in debonding mechanism caused by the elasticity of the substrate.
URL:https://seasevents.nmsdev7.com/event/cbe-seminar-soft-wet-and-sticky-viscous-forces-and-elasticity-in-wet-adhesion/
LOCATION:Wu and Chen Auditorium (Room 101)\, Levine Hall\, 3330 Walnut Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Seminar
ORGANIZER;CN="Chemical and Biomolecular Engineering":MAILTO:cbemail@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191120T100000
DTEND;TZID=America/New_York:20191120T113000
DTSTAMP:20260408T150742
CREATED:20191113T160557Z
LAST-MODIFIED:20191113T160557Z
UID:10006333-1574244000-1574249400@seasevents.nmsdev7.com
SUMMARY:ESE Thesis Defense: Cassiano Becker
DESCRIPTION:Title: “Data-Driven Modeling\, Analysis and Design of Networked Dynamical Systems with Applications in Neuroscience” \nAbstract: In this thesis\, we provide contributions to the modeling\, analysis and design of networked dynamical systems from a data-driven perspective. Our approach is grounded on the integration of concepts and tools from graph theory\, control theory\, optimization\, and statistics. In particular\, we develop methodologies that can be applied to challenging\, high-dimensional problems where only partial or summarized information about the structure and function of a complex system is available. We validate our methods across different application domains\, most remarkably with large-scale neuroimaging datasets that follow state-of-the-art acquisition techniques and span multiple individuals and experimental paradigms. \nStructurally\, the contributions of this thesis have been divided in three parts. In the first part\, we address the topic of inference and analysis of complex networks. In particular\, we establish data-driven models and algorithms that approximate measures of functional connectivity\, derived from a system’s potentially complex dynamics\, as a matrix mapping based on structural connectivity information. Using tools from spectral graph theory\, we propose a mapping technique that is able to systematically account for the role of indirect structural walks in the generation of functional associations. We then apply our method to obtain accurate structural-to-functional connectivity mappings for brain networks derived from functional magnetic resonance (fMRI) and diffusion imaging measurements\, and perform a series of analyses of the generated mappings in terms of their spectral characteristics. \nIn the second part\, we devote our attention to the problem of identification of system dynamics. First\, we generate data-driven dynamic models that capture the influence of cognitive inputs on brain signals that are observed through fMRI measurements. More specifically\, we extend subspace system identification methods to create large-scale\, linear time-invariant representations for both single and multiple-individual configurations of a motor task-fMRI experiment\, and apply control-theoretic tools to analyze the dynamical characteristics of the resulting models. Subsequently\, to abate some general limitations of linear time-invariant models\, we propose three novel system identification approaches. Specifically\, we (i) enable the identification of state-space linear time-varying models through a generalized expectation maximization method\, (ii) perform the estimation of linear parameter-varying models having a latent parameter space via Bayesian variational inference\, and (iii) implement blind subspace identification using Riemannian optimization. \nIn the last part of the thesis\, we focus on the topic of network design for dynamic performance. More specifically\, we address the problem of finding edge weights of a linear networked dynamical system such that certain bounds on its controllability metrics are satisfied. In particular\, we consider the worst-case (i.e.\, minimum eigenvalue of the controllability Gramian) and average-case (i.e.\, trace of the inverse controllability Gramian) metrics. Algorithmically\, we provide a principled convex relaxation approach that exhibits guaranteed convergence and known global optimal value. Our methodology includes the possibility to consider cost functions over the edge weights which can be used\, for example\, to promote solutions with higher sparsity in the required edge modifications. Finally\, we verify our results with numerical simulations over many random network realizations\, and with multi-agent and power system topologies. \nAdvisor:\nVictor M. Preciado\, Associate Professor of Electrical and System Engineering\nGraduate Chair of Electrical and System Engineering\nDepartment of Electrical and Systems Engineering\nDepartment of Applied Mathematics and Computational Science\nUniversity of Pennsylvania \nCommittee:\nGeorge J. Pappas (chair)\, Full Professor and Department Chair\nDepartment of Electrical and Systems Engineering\, Department of Computer and Information Sciences\, Department of Mechanical Engineering and Applied Mechanics\nUniversity of Pennsylvania \nDanielle S. Bassett (member)\, J. Peter Skirkanich Professor\nDepartment of Bioengineering\, Department of Electrical and Systems Engineering Department of Physics and Astronomy\, Department of Neurology\, Department of Psychiatry\nUniversity of Pennsylvania \nSergio Pequito (member)\, Assistant Professor\nDepartment of Industrial and Systems Engineering\nDepartment of Electrical\, Computer\, and Systems Engineering\nRensselaer Polytechnic Institute
URL:https://seasevents.nmsdev7.com/event/ese-thesis-defense-cassiano-becker/
LOCATION:Room 307\, Levine Hall\, 3330 Walnut Street\, Philadelphia\, PA\, 19104\, United States
ORGANIZER;CN="Electrical and Systems Engineering":MAILTO:eseevents@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191119T160000
DTEND;TZID=America/New_York:20191119T180000
DTSTAMP:20260408T150742
CREATED:20191115T164621Z
LAST-MODIFIED:20191115T164621Z
UID:10006335-1574179200-1574186400@seasevents.nmsdev7.com
SUMMARY:ESE Dissertation Defense: David Q. Sun
DESCRIPTION:Title: “Understanding Coalition Dynamics in Multiparty Conflicts: An Agent-Based Approach with Multi-Objective Spatial Model” \nAbstract: Through this research\, we explore the dynamics of coalition formation in multi-agent competitive games where each agent has its unique characteristics. We do so by constructing an abstract formal model\, and a more complex agent-based model. In the broader context of multiparty competitive games (which are closely related to civil wars)\, we make several critical assumptions regarding the motivations for coalition formation (and dis-integration) and view coalitions as an outcome of rational\, utilitarian choices made by the agents. Accordingly\, we investigate two specific types of such problems. The first problem is the existence and characteristics of the stable states. We investigate when such stable states are viable\, and potential path dependency on initial states. The second problem is the influence of certain changes in agent properties (objective position in Euclidean space\, normalized power size\, etc.) on the dynamics of coalition formations. In particular\, we are interested in learning how such characteristics influence the evolution surrounding stable states. \nWe approach the problems using two set of methods. First\, we present a formal\, mathematical model inspired by theories from non-cooperative games and the legislative coalition formations\, to explore the existence and characteristics of the stable states. Later\, we develop an agent-based counterpart that extends the formal model. We leverage computational modeling to explore the system dynamics at scale. The findings on the characteristics of coalition dynamics model are further validated through both statistical analysis and empirical case studies\, where we also compare the model predictions with those from alternative coalition theories from relevant fields. \nCommittee Members:  \nProf. Tony E. Smith (Chair) Professor of Electrical and Systems Engineering\, University of Pennsylvania \nBarry G. Silverman (Advisor) Professor of Electrical and Systems Engineering\, University of Pennsylvania \nSteven O. Kimbrough (Reader) Professor of Operations\, Information and Decisions\, Wharton School\, University of Pennsylvania \nDr. Alexander Kalloniatis (External Reader) Defense Science and Technology Organisation\, Australian Department of Defense
URL:https://seasevents.nmsdev7.com/event/ese-dissertation-defense-david-q-sun/
LOCATION:Room 307\, Levine Hall\, 3330 Walnut Street\, Philadelphia\, PA\, 19104\, United States
ORGANIZER;CN="Electrical and Systems Engineering":MAILTO:eseevents@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191119T150000
DTEND;TZID=America/New_York:20191119T160000
DTSTAMP:20260408T150742
CREATED:20191111T144811Z
LAST-MODIFIED:20191111T144811Z
UID:10006331-1574175600-1574179200@seasevents.nmsdev7.com
SUMMARY:CIS Seminar: "Reducing Errors in Quantum Computation via Program Transformation"
DESCRIPTION:Abstract:  \nQuantum computing promises exponential speedups for an important class of problems. While quantum computers with few dozens of qubits have been demonstrated\, these machines suffer from high rate of gate errors. Such machines are operated in the Noisy Intermediate Scale Quantum (NISQ) mode of computing where the output of the machine can be erroneous. In this talk\, I will discuss some of our recent work that aims to improve the reliability of NISQ computers by developing software techniques to mitigate the hardware errors. Our first= work (ASPLOS 2019) exploits the variability in the error rates of qubits to steer more operations towards qubits with lower error rates and avoid qubits that are error-prone. Our second work (MICRO 2019) looks at executing different versions of the programs each crafted to cause diverse mistakes so that the machine becomes less vulnerable to correlated errors. Our third work (MICRO 2019) looks at exploiting the state-dependent bias in measurement errors (state 1 is more error prone than state 0) and dynamically flips the state of the qubit to perform the measurement in the stronger state. We perform our evaluations on real quantum machines from IBM and demonstrate significant improvement in the overall system reliability. If time permits\, I will also briefly discuss the hardware aspect of designing quantum computers\, including cryogenic processor and cryogenic memory system.
URL:https://seasevents.nmsdev7.com/event/cis-seminar-reducing-errors-in-quantum-computation-via-program-transformation/
LOCATION:Wu and Chen Auditorium (Room 101)\, Levine Hall\, 3330 Walnut Street\, Philadelphia\, PA\, 19104\, United States
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191119T110000
DTEND;TZID=America/New_York:20191119T120000
DTSTAMP:20260408T150742
CREATED:20190918T164828Z
LAST-MODIFIED:20190918T164828Z
UID:10006289-1574161200-1574164800@seasevents.nmsdev7.com
SUMMARY:ESE Seminar: "Enabling the SmartGrid with IoT Sensors and Edge-Cloud Analytics"
DESCRIPTION:Abstract: Wireless sensors and edge-cloud analytics have the potential to gather and process vast amounts of data about the physical world\, offering radical new insights about everything from critical infrastructure to interpersonal interactions. But designing\, deploying\, and operating geographically-distributed systems consisting a hierarchy of sensing\, storage\, compute\, and communication elements raises interesting new challenges across the system stack. In this talk\, we will discuss our experiences designing new IoT systems to address several power and power grid monitoring problems. In particular\, this talk will focus on three systems—PowerBlade\, Triumvi\, and GridWatch—and their motivation\, design\, and deployment. PowerBlade explores how to cost-effectively characterize\, capture\, and classify widespread plug-load energy usage—representing the fastest growing and least understood segment of end-use energy consumption—across hundreds of homes and offices representing tens of thousands of sensors.\nTriumvi explores how to make circuit level energy metering\, useful for a variety of facilities trending\, energy savings\, and fault detection & diagnostics applications\, more efficient and scalable. Finally\, GridWatch explores how to scalably and cost-effectively detect and respond to the power outages that stymie residential and business activity in under-developed power grids using mobile and fixed sensors\, data analytics\, and reporting systems in Sub-Saharan Africa\, finding that conventional approaches to outage detection systems vastly underreport customer experiences. These systems all share a similar architecture\, require new sensor devices and edge-cloud data processing\, and wrestle with power management and networking. But they ultimately demonstrate both the tremendous potential and the significant challenges of this nascent computing class.
URL:https://seasevents.nmsdev7.com/event/ese-seminar-enabling-the-smartgrid-with-iot-sensors-and-edge-cloud-analytics/
LOCATION:PICS Conference Room 534 – A Wing \, 5th Floor\, 3401 Walnut Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Seminar
ORGANIZER;CN="Electrical and Systems Engineering":MAILTO:eseevents@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191119T103000
DTEND;TZID=America/New_York:20191119T120000
DTSTAMP:20260408T150742
CREATED:20190927T174931Z
LAST-MODIFIED:20190927T174931Z
UID:10006304-1574159400-1574164800@seasevents.nmsdev7.com
SUMMARY:MEAM Seminar: "Origami Micro\, Bio\, and Nanosystems "
DESCRIPTION:Due to the inherent planarity of conventional micro and nanofabrication\, it is challenging to pattern and assemble micro\, bio\, and nano-materials and devices in all three dimensions. Origami inspired mechanical assembly by curving\, bending\, and folding of appropriately designed micro and nanopatterned precursors provides a high-throughput solution to address this challenge.\nIn this talk\, I will discuss how the engineering of thin film differential-stress\, capillary forces\, and swelling can be used to mechanically shape materials and devices in 3D. I will discuss geometric design principles\, mechanics considerations\, fabrication processes\, and applications of 3D micro\, bio and nanosystems that have been assembled by curving\, bending\, and folding. Examples include capillary-force assisted self-folding of micro/nanoscale polyhedra with lithographically patterned surfaces\, thermoresponsive bending and folding of atomically thin materials such as graphene and MoS2\, optical and electrical shell sensors assembled using differential stress and thermobiochemically stimuli responsive shape-shifting hydrogels and microgrippers for drug delivery\, tissue engineering\, and surgery.
URL:https://seasevents.nmsdev7.com/event/meam-seminar-origami-micro-bio-and-nanosystems/
LOCATION:Wu and Chen Auditorium (Room 101)\, Levine Hall\, 3330 Walnut Street\, Philadelphia\, PA\, 19104\, United States
ORGANIZER;CN="Mechanical Engineering and Applied Mechanics":MAILTO:meam@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191118T120000
DTEND;TZID=America/New_York:20191118T130000
DTSTAMP:20260408T150742
CREATED:20190919T184656Z
LAST-MODIFIED:20190919T184656Z
UID:10006295-1574078400-1574082000@seasevents.nmsdev7.com
SUMMARY:PSOC Seminar : "Molecular microscopy without labels: Seeing the chemistry in biomedical  science"
DESCRIPTION:
URL:https://seasevents.nmsdev7.com/event/psoc-seminar-molecular-microscopy-without-labels-seeing-the-chemistry-in-biomedical-science/
LOCATION:Room 337\, Towne Building\, 220 South 33rd Street\, Philadelphia\, PA\, 19104\, United States
ORGANIZER;CN="PSOC":MAILTO:manu@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191114T150000
DTEND;TZID=America/New_York:20191114T160000
DTSTAMP:20260408T150742
CREATED:20191105T145928Z
LAST-MODIFIED:20191105T145928Z
UID:10006329-1573743600-1573747200@seasevents.nmsdev7.com
SUMMARY:CIS: Grace Hopper Distinguished Lecture: "A 2020 Vision of U.S. Election Security"
DESCRIPTION:Abstract: \nDespite the provision of a $380M federal grant to enhance technology and improve security in the 2018 midterm elections\, machine failures and computer malfunctions again plagued polling places (in GA\, PA\, NY\, IN\, TX\, and MA)\, resulting in late openings\, long lines\, and turned-away voters. Poor ballot layouts resurfaced in Florida\, resulting in nearly 25\,000 missed votes and the removal of the Broward County Supervisor of Elections\, due to “misfeasance\, incompetence and neglect of duty.” Many of the unauditable electronic voting machines are now being replaced with paper ballots and scanners\, but creative State legislation (including in FL\, MI and CA) and new tactics (such as risk-limiting audits) are increasingly being used to thwart and prohibit comprehensive recounts\, even when results fall within the range of equipment error. This talk examines some of the shenanigans that we may be looking forward to seeing in 2020\, sheds light on the reasons why contrived (and even avoidable) disenfranchisement continues to play a fundamental role in American Democracy\, and offers some suggestions for improvement.
URL:https://seasevents.nmsdev7.com/event/cis-grace-hopper-distinguished-lecture-a-2020-vision-of-u-s-election-security/
LOCATION:Wu and Chen Auditorium (Room 101)\, Levine Hall\, 3330 Walnut Street\, Philadelphia\, PA\, 19104\, United States
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191114T104500
DTEND;TZID=America/New_York:20191114T114500
DTSTAMP:20260408T150742
CREATED:20191101T152211Z
LAST-MODIFIED:20191101T152211Z
UID:10006327-1573728300-1573731900@seasevents.nmsdev7.com
SUMMARY:MSE Seminar: “How Do You Make a Micro-Robot?”
DESCRIPTION:
URL:https://seasevents.nmsdev7.com/event/mse-seminar-how-do-you-make-a-micro-robot/
LOCATION:Auditorium\, LRSM Building\, 3231 Walnut Street\, Philadelphia\, PA\, 19104\, United States
ORGANIZER;CN="Materials Science and Engineering":MAILTO:johnruss@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191112T150000
DTEND;TZID=America/New_York:20191112T160000
DTSTAMP:20260408T150742
CREATED:20191105T145249Z
LAST-MODIFIED:20191105T145249Z
UID:10006328-1573570800-1573574400@seasevents.nmsdev7.com
SUMMARY:CIS Seminar: "Achieving CSforALL through the Beauty and Joy of Computing (BJC)"
DESCRIPTION:Abstract:  \nAt a time when computing is so much a part of all of our lives\, has incredible job opportunities\, and is so empowering\, most students graduate high school without having had any introduction to computer science. A decade ago in the United States\, the CSforALL movement was launched to broaden participation in computing to those traditionally underrepresented. This talk will reflect on the current state of that initiative\, and introduce the “Beauty and Joy of Computing (BJC)” course\, which has received worldwide attention and currently has 65% female enrolment at UC Berkeley\, among the highest in the nation.
URL:https://seasevents.nmsdev7.com/event/cis-seminar-achieving-csforall-through-the-beauty-and-joy-of-computing-bjc/
LOCATION:Wu and Chen Auditorium (Room 101)\, Levine Hall\, 3330 Walnut Street\, Philadelphia\, PA\, 19104\, United States
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191111T120000
DTEND;TZID=America/New_York:20191111T130000
DTSTAMP:20260408T150742
CREATED:20191028T151920Z
LAST-MODIFIED:20191028T151920Z
UID:10006325-1573473600-1573477200@seasevents.nmsdev7.com
SUMMARY:MEAM Doctoral Dissertation Defense: "High-Dimensional Design Evaluations for Self-Aligning Geometries"
DESCRIPTION:Physical connectors with self-aligning geometry aid in the docking process for many robotic and automatic control systems such as robotic self-reconfiguration and air-to-air refueling. This self-aligning geometry provides a wider range of acceptable error tolerance in relative pose between the two rigid objects\, increasing successful docking chances. In a broader context\, mechanical alignment properties are also useful for other cases such as foot placement and stability\, grasping or manipulation. Previously\, computational limitations and costly algorithms prevented high-dimensional analysis. The algorithms presented in this talk will show a reduced computational time and improved resolution for this kind of problem. \nThis dissertation will review multiple methods for evaluating modular robot connector geometries as a case study in determining alignment properties. Several metrics are introduced in terms of the robustness of the alignment to errors across the full dimensional range of possible offsets. Algorithms for quantifying error robustness will be introduced and compared in terms of accuracy\, reliability\, and computational cost. Connector robustness is then compared across multiple design parameters to find trends in alignment behavior. Methods developed and compared include direct simulation and contact space analysis algorithms (geometric by a ‘pre-partitioning’ method\, and discrete by flooding). Experimental verification for certain subsets is also performed to confirm the results. By evaluating connectors using these algorithms we obtain concrete metric values. We can then quantitatively compare their alignment capabilities in either SE(2) or SE(3) under a pseudo-static assumption.
URL:https://seasevents.nmsdev7.com/event/meam-doctoral-dissertation-defense-high-dimensional-design-evaluations-for-self-aligning-geometries/
LOCATION:Room 3W2\, David Rittenhouse Lab\, 209 South 33rd Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Dissertation or Thesis Defense
ORGANIZER;CN="Mechanical Engineering and Applied Mechanics":MAILTO:meam@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191111T120000
DTEND;TZID=America/New_York:20191111T130000
DTSTAMP:20260408T150742
CREATED:20190919T184225Z
LAST-MODIFIED:20190919T184225Z
UID:10006294-1573473600-1573477200@seasevents.nmsdev7.com
SUMMARY:PSOC Seminar : " Coordination between fast migrating tumor cells and their microenvironment mediates melanoma metastasis"
DESCRIPTION:
URL:https://seasevents.nmsdev7.com/event/psoc-seminar-xiolin-nan-phd/
LOCATION:Room 337\, Towne Building\, 220 South 33rd Street\, Philadelphia\, PA\, 19104\, United States
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191108T140000
DTEND;TZID=America/New_York:20191108T150000
DTSTAMP:20260408T150742
CREATED:20190923T140853Z
LAST-MODIFIED:20190923T140853Z
UID:10006297-1573221600-1573225200@seasevents.nmsdev7.com
SUMMARY:PICS Seminar: "Mathematical Modeling of Thrombin-Fibrin Binding Dynamics"
DESCRIPTION:Abstract: Blood clot formation involves the coupled processes of platelet aggregation and coagulation\, which are triggered when there is break in a blood vessel. Platelet aggregation is largely a physical process while coagulation is biochemical\, consisting of a large network of reactions that culminate in the generation of the enzyme thrombin. Thrombin cleaves fibrinogen into fibrin\, which polymerizes into fibers to form a stabilizing gel matrix in and around growing platelet aggregates. Thrombin also (re)binds directly to fibrin but this interaction\, and its purpose\, is not fully understood. Thrombin-fibrin binding is often described as two independent\, single-step binding events\, one high-affinity and one low-affinity\, each through a different exosite on thrombin. However\, kinetic schemes describing these single-step binding events with reported kinetic rate constants cannot explain experimentally-observed residency times of fibrin-bound thrombin. In this work\, we study a bivalent\, sequential-step binding scheme as an alternative to the high-affinity event\, and in addition to the low-affinity one. We developed mathematical models for the single- and sequential-step schemes consisting of reaction-diffusion equations to compare to each other and to previously published experimental data. We then used Bayesian inference\, in the form of Markov Chain Monte Carlo\, to learn model parameter distributions from the experimental data. For the model to best fit the data\, we needed an additional assumption that thrombin was irreversibly sequestered; we hypothesized that this could be due to thrombin becoming physically trapped within fibrin fibers as they formed. We also discuss how our model can be used to further probe scenarios dealing with thrombin allostery.
URL:https://seasevents.nmsdev7.com/event/pics-seminar-mathematical-modeling-of-thrombin-fibrin-binding-dynamics/
LOCATION:PICS Conference Room 534 – A Wing \, 5th Floor\, 3401 Walnut Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Colloquium
ORGANIZER;CN="Penn Institute for Computational Science (PICS)":MAILTO:dkparks@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191107T104500
DTEND;TZID=America/New_York:20191107T114500
DTSTAMP:20260408T150742
CREATED:20191028T143224Z
LAST-MODIFIED:20191028T143224Z
UID:10006324-1573123500-1573127100@seasevents.nmsdev7.com
SUMMARY:MSE Seminar: "Why Industrial Research Is Critical: A Brief History in the 20th and 21st Centuries"
DESCRIPTION:
URL:https://seasevents.nmsdev7.com/event/mse-seminar-why-industrial-research-is-critical-a-brief-history-in-the-20th-and-21st-centuries/
LOCATION:Auditorium\, LRSM Building\, 3231 Walnut Street\, Philadelphia\, PA\, 19104\, United States
ORGANIZER;CN="Materials Science and Engineering":MAILTO:johnruss@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191106T153000
DTEND;TZID=America/New_York:20191106T163000
DTSTAMP:20260408T150742
CREATED:20191004T184556Z
LAST-MODIFIED:20191004T184556Z
UID:10006310-1573054200-1573057800@seasevents.nmsdev7.com
SUMMARY:Herman P. Schwan Distinguished Lecture: "Engineering human tissues for medical impact"
DESCRIPTION:The classical paradigm of tissue engineering involves the integrated use of human stem cells\, biomaterial scaffolds (providing a structural and logistic template for tissue formation) and bioreactors (providing environmental control\, dynamic sequences of molecular and physical signaling\, and insights into the structure and function of the forming tissues). This “biomimetic” approach results in an increasingly successful representation of the environmental milieu of tissue development\, regeneration and disease. Living human tissues are now being engineered from various types of human stem cells\, and tailored to the patient and the condition being treated. A reverse paradigm is now emerging with the development of the “organs on a chip” platforms for modeling of integrated human physiology\, using micro-tissues that are derived from human iPS cells and functionally connected by vascular perfusion. In all cases\, the critical questions relate to our ability to recapitulate the cell niches\, using bioengineering tools. To illustrate the state of the art in the field and reflect on the current challenges and opportunities\, this talk will discuss: (i) anatomically correct bone regeneration\, (ii) bioengineering of the lung\, (iii) heart repair by a cell-free therapy\, and (iv) the use of “organs on a chip” for patient-specific studies of human physiology\, injury\, healing and disease. \nFunding: NIH\, NSF\, New York State\, Mikati Foundation\, Schwartz Foundation \nCatered reception to follow.
URL:https://seasevents.nmsdev7.com/event/schwan-lecture-engineering-human-tissues-for-medical-impact/
LOCATION:Glandt Forum\, Singh Center for Nanotechnology\, 3205 Walnut Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Distinguished Lecture
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191106T150000
DTEND;TZID=America/New_York:20191106T160000
DTSTAMP:20260408T150742
CREATED:20190729T192322Z
LAST-MODIFIED:20190729T192322Z
UID:10006251-1573052400-1573056000@seasevents.nmsdev7.com
SUMMARY:CBE Seminar: "Tailoring Processes and Assembly of Nanomaterials for Electrochemical Energy Storage”
DESCRIPTION:Abstract: \nDespite their promise to mitigate many problems and offer new opportunities in energy storage systems\, nanomaterials have proven to be difficult to tailor and preserve their assembly throughout manufacturing processes when a scale-up is considered. My group has been working on understanding and modification of instability-driven processes to devise scalable manufacturing processes such as gas-assisted electrospinning and air-controlled electrospray\, which can also provide the tailored assembly of nanomaterials. I will show several examples of using these processes to assemble various nanomaterials in the development of next generation battery materials\, including: 1) thermally stable\, non-flammable polymer/ceramic hybrid separator and high capacity silicon/graphene anode for high performance Li-ion batteries; and 2) graphene coated separator and highly loaded\, layered sulfur/graphene cathode for high rate Li-sulfur batteries.
URL:https://seasevents.nmsdev7.com/event/cbe-seminar-tailoring-processes-and-assembly-of-nanomaterials-for-electrochemical-energy-storage/
LOCATION:Wu and Chen Auditorium (Room 101)\, Levine Hall\, 3330 Walnut Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Seminar
ORGANIZER;CN="Chemical and Biomolecular Engineering":MAILTO:cbemail@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191105T150000
DTEND;TZID=America/New_York:20191105T160000
DTSTAMP:20260408T150742
CREATED:20191029T152743Z
LAST-MODIFIED:20191029T152743Z
UID:10006326-1572966000-1572969600@seasevents.nmsdev7.com
SUMMARY:CIS Seminar: "Contesting Secure Development to Understand Security Mistakes"
DESCRIPTION:Abstract:  \nWith the ongoing\, frequent disclosure of the existence and exploitation of security vulnerabilities\, one might wonder: How can we can build software that is more secure? In an attempt to focus educational attention on this question\, and gather empirical evidence at the same time\, we developed the Build it\, Break it\, Fix it (BIBIFI) security-oriented programming contest. In BIBIFI\, teams aim to build specified software that should be correct\, efficient\, and secure. These goals mimic those of the real world. Security is tested when teams attempt to break other teams’ submissions. Winners are chosen from among the best builders and the best breakers. BIBIFI was designed to be open-ended — teams can use any language\, tool\, process\, etc. that they like.\n\nWe ran three 6-week contests involving a total of 156 teams from across the world\, and three different programming problems. Most participants had previous development experience and security education. Quantitative analysis from these contests found several interesting trends. For example\, the most efficient build-it submissions used C/C++\, but submissions coded in a statically-type safe language were 11× less likely to have a security flaw than C/C++ submissions. A manual\, in-depth qualitative analysis (using iterative open coding) of the vulnerabilities in 76 of these projects also revealed interesting trends. For example\, the analysis found that simple mistakes were least common: only 26% of projects introduced such an error. Conversely\, vulnerabilities arising from a misunderstanding of security concepts were significantly more common: 84% of projects introduced at least one such error. Overall\, our results have implications for improving secure-programming language choices\, API designs\, API documentation\, vulnerability-finding tools\, and security education.\n\nThis is joint work with James Parker\, Andrew Ruef\, Dan Votipka\, Kelsey Fulton\, Matthew Hou\, Michelle Mazurek\, and Dave Levin\, all at the University of Maryland
URL:https://seasevents.nmsdev7.com/event/cis-seminar-contesting-secure-development-to-understand-security-mistakes/
LOCATION:Wu and Chen Auditorium (Room 101)\, Levine Hall\, 3330 Walnut Street\, Philadelphia\, PA\, 19104\, United States
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191105T110000
DTEND;TZID=America/New_York:20191105T120000
DTSTAMP:20260408T150742
CREATED:20190806T152650Z
LAST-MODIFIED:20190806T152650Z
UID:10006261-1572951600-1572955200@seasevents.nmsdev7.com
SUMMARY:ESE Seminar: "Metasurface Computational Imaging"
DESCRIPTION:Modern image sensors consist of systems of cascaded and bulky spherical optics for imaging with minimal aberrations. While these systems provide high-quality images\, the improved functionality comes at the cost of increased size and weight. One route to reduce a system’s complexity is via computational imaging\, in which much of the aberration correction and functionality of the optical hardware is shifted to post-processing in the software realm. Alternatively\, a designer could miniaturize the optics by replacing them with diffractive optical elements\, which mimic the functionality of refractive systems in a more compact form factor. Metasurfaces are an extreme example of such diffractive elements\, in which quasiperiodic arrays of resonant subwavelength optical antennas impart spatially-varying changes on a wavefront. While separately both computational imaging and metasurfaces are promising avenues toward simplifying optical systems\, a synergistic combination of these fields can further enhance system performance and facilitate advanced capabilities. In this talk\, I will present a method to combine these two techniques to perform full-color imaging across the whole visible spectrum [1]. I will also discuss the use of computational techniques to design new metasurfaces [2]\, and using metasurfaces to perform computation on wavefronts\, with applications in optical information processing and sensing. \n \nFigure: (a) Hybrid cubic-quadratic metasurface; (b) Using the metasurface and computational imaging we demonstrated full-color imaging; (c) We developed inverse design methodologies for metasurfaces made of dielectric spheres. \nReferences: [1] S. Colburn\, A. Zhan\, and A. Majumdar\, “Metasurface optics for full-color computational imaging\,” Science Advances\, vol. 4\, 2018. [2] A. Zhan\, T. K. Fryett\, S. Colburn\, and A. Majumdar\, “Inverse design of optical elements based on arrays of dielectric spheres\,” Applied Optics\, vol. 57\, pp. 1437-1446\, 2018/02/20 2018.
URL:https://seasevents.nmsdev7.com/event/ese-seminar-arka-majumdar/
LOCATION:PICS Conference Room 534 – A Wing \, 5th Floor\, 3401 Walnut Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Seminar
ORGANIZER;CN="Electrical and Systems Engineering":MAILTO:eseevents@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191105T103000
DTEND;TZID=America/New_York:20191105T120000
DTSTAMP:20260408T150742
CREATED:20191014T183451Z
LAST-MODIFIED:20191014T183451Z
UID:10006316-1572949800-1572955200@seasevents.nmsdev7.com
SUMMARY:MEAM Seminar: "Multi-Stable Morphing Structures"
DESCRIPTION:Variable geometry “morphing” structures can achieve different geometric configurations through overall deformation\, but usually many actuators are required for shape control. In this talk we consider a particular type of morphing structure that is able to switch configuration with only a few actuators. It is based on the concept of embedding by design local energy minima in the configuration space of the structure. A general bar and plate structure connected by frictionless hinges can be made locally stable in a set of chosen target configurations by attaching extensional and rotational springs to the structure. The unstressed lengths and angles of the springs\, as well as their stiffnesses\, are the design parameters. We present a general theory to formulate the required equilibrium and stability conditions. Solutions of these equations provide specific values of the spring properties that correspond to local energy minima in all of the target configurations. Applications to reconfigurable antennas are also presented.
URL:https://seasevents.nmsdev7.com/event/meam-seminar-multi-stable-morphing-structures/
LOCATION:Wu and Chen Auditorium (Room 101)\, Levine Hall\, 3330 Walnut Street\, Philadelphia\, PA\, 19104\, United States
ORGANIZER;CN="Mechanical Engineering and Applied Mechanics":MAILTO:meam@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191101T140000
DTEND;TZID=America/New_York:20191101T150000
DTSTAMP:20260408T150742
CREATED:20190909T184651Z
LAST-MODIFIED:20190909T184651Z
UID:10006282-1572616800-1572620400@seasevents.nmsdev7.com
SUMMARY:PICS Seminar: "High-order Spectral Difference Method for Studying Marine Hydrodynamics and Thermal Convection and Magneto-hydrodynamics for the Sun"
DESCRIPTION:Abstract\nTwo recent advancements of high-order spectral difference (SD) method for computational fluid dynamics on unstructured meshes will be presented. The first progress is our contribution to a new curved sliding-mesh approach to the SD method for simulating flapping and rotary wing aerodynamics.  The second elevation of the SD method is our recent successful design of a massively parallel code\, namely CHORUS\, for predicting thermal convection in the Sun.  Recently\, we have also built a simulation capability for predicting magnetohydrodynamics of the Sun.
URL:https://seasevents.nmsdev7.com/event/pics-seminar-high-order-spectral-difference-method-for-studying-marine-hydrodynamics-and-thermal-convection-and-magneto-hydrodynamics-for-the-sun/
LOCATION:PICS Conference Room 534 – A Wing \, 5th Floor\, 3401 Walnut Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Colloquium
ORGANIZER;CN="Penn Institute for Computational Science (PICS)":MAILTO:dkparks@seas.upenn.edu
END:VEVENT
END:VCALENDAR