Raana Sabri Khiavi PhD Dissertation Defense
2024-04-17 12:00 - 13:30 (America/New_York)
Name:
Raana Sabri Khiavi
Title:
Theory and Design of Spatiotemporal Metasurfaces for Comprehensive Control of Light
Date:
4/17/2024
Time:
12:00:00 PM
Location:
In person: Exp 311
Committee Members:
Prof. Hossein Mosallaei (Advisor)
Prof. Josep Jornet (Co-advisor)
Prof. Charles Dimarzio
Prof. Siddhartha Ghosh
Abstract:
Photonic metasurfaces are key components for manipulating almost all properties of light such as amplitude, phase, polarization, wave vector, pulse shape and orbital angular momentum at subwavelength scale. They are capable of sculpting the wavefront of the scattered light through imparting spatial or temporal modulation. Recently, considerable efforts have been devoted to design active metasurfaces that enable real-time tuning and post-fabrication control of the optical response. Toward achieving this goal, electro-optically tunable materials such as doped semiconductors, MQWs, and atomically thin sheets are incorporated into the building blocks of the geometrically-fixed metasurfaces. Despite the significant progress in this field, there have been several limitations imparted to the optical response of such so-called quasi-static metasurfaces. Remarkably, the strong resonant dispersion in such metasurfaces leads to narrow spectral and angular bandwidths. In addition, the co-varying amplitude and phase response as well as the limited phase modulation give rise to undesired artefacts manifested on their output profiles. The slow response time to the external stimuli is another drawback that restricts the performance of the metasurfaces. Introducing time into the external stimulus of the metasurfaces, as an additional degree of freedom, offers a way out to surmount the obstacles facing the quasi-static metasurfaces. Modulation in time enables myriad of exotic space-time scattering phenomena, where possibility to break the reciprocity and generation/manipulation of the sideband scattered signals offer the most appealing functionalities. In a space-time device, the reciprocity constraint is lifted, and time-reversal symmetry is broken. This effect can enable optical isolation and circulation, while allowing for attaining full-duplex communication by rejecting the interference between up and down communication links. In addition, sideband generation/manipulation provides access to the dispersionless modulation-induced phase shift with full 2pi span as well as a constant amplitude. The objective of this dissertation is to investigate the mechanisms for yielding reconfigurable plasmonic/all-dielectric metasurfaces in both space and time. Several realizations of quasi-static and time-modulated devices integrated with the electro-optical materials such as ITO and InAs with the potential for high reflection and wide phase modulation are presented. It has been shown that time-modulated metasurfaces are superior to their quasi-static counterparts. Novel and unique applications of space-time photonic metasurfaces by spatiotemporal manipulation of light for all-angle, broadband beam steering, suppressing the undesired sidelobes, high speed continuous beam scanning, single sideband suppressed carrier modulation, dispersionless dynamic wavefront engineering, and magnetless power isolation at free space have been studied.

Bengisu Ozbay PhD Dissertation Defense
2024-04-17 12:00 - 14:00
Name:
Bengisu Ozbay
Title:
Fast Semi-Algebraic Clustering for Efficient System Identification and
Geometric Scene Understanding
Date:
4/17/2024
Time:
12:00:00 PM
Location:(EV) 102
Committee Members:
Prof. Mario Sznaier (Advisor)
Prof. Octavia Camps
Prof. Taskin Padir
Prof. Rifat Sipahi
Abstract:
As the demand for data-driven techniques in machine learning and computer vision continues to rise, the reliance on unsupervised learning methods becomes increasingly prevalent. Piecewise linear or affine models offer versatile solutions across various domains, including system identification and computer vision tasks.
This dissertation introduces an efficient methodology that relies solely on singular value decomposition of matrices, maintaining a fixed size independent of the total number of data points. Remarkably, this method only requires execution a number of times equivalent to the number of clusters. Through singular value decomposition (SVD) of the empirical moments matrix containing the data, we demonstrate the feasibility of identifying the polynomials representing hyperplanes. Central to this approach is the utilization of polynomials and Christoffel functions, facilitating the partitioning of data into distinct clusters, each with its own set of parameters extracted using application-specific techniques.
The dissertation explores various challenges, including semi-algebraic clustering, identification of switching auto-regressive models with exogenous inputs (SARX), affine linear subspace clustering, two-view motion segmentation, identification of Wiener systems, and switched nonlinear system identification using block-oriented models. The proposed semi-algebraic clustering framework identifies reliable subsets from data, sequentially segments data using Christoffel polynomials, and extends the approach beyond linear affine arrangements to address challenges involving quadratic surfaces in two-view motion segmentation and higher order algebraic varieties in switched-Wiener system identification.

Soft Matter Days
2024-04-17 13:30 - 14:30
Soft Matter Days: April 8-17, will feature invited guest speakers discussing a variety of interdisciplinary topics in soft matter and complex fluids. These topics sit at the interface of chemical & mechanical engineering, materials science, physics, chemistry, and biology. Guest speakers will discuss real-world phenomena found in food, blood flow, and granular materials. Two talks are guest lectures in CHME5179: RSVP required for those not in the class.
Monday, April 8, 2:15pm, Curry 340
Capillary Rise and Thin Films Near Edges: New Insights from Self-similarity
Howard Stone, Princeton University
Host: Xiaoyu Tang x.tang@northeastern.edu
Tuesday, April 9, 9:50am, Zoom (Guest Lecture for CHME 5179)
“Complex Fluids & Soft Matter in Food”
Dave Weitz, Harvard University
RSVP: Sara Hashmi s.hashmi@northeastern.edu
Thursday, April 11, 1:30pm, HS 210
Dynamics of blood flow at the cellular level in health and disease
Michael Graham, University of Wisconsin
Host: Sara Hashmi s.hashmi@northeastern.edu
Friday, April 12, 9:50am, Zoom (Guest Lecture for CHME 5179)
Nonlinear Rheology of Complex Fluids: Exploring Microstructure
Kate Honda, Northeastern University
RSVP: Sara Hashmi s.hashmi@northeastern.edu
Wednesday, April 17, 1:30pm, HS 210
Universality and scaling in shear thickening suspensions
Bulbul Chakraborty, Brandeis University
Host: Sara Hashmi s.hashmi@northeastern.edu

LinkedIn, CV, Resume: A CommLab Workshop Series
2024-04-17 14:00 - 15:00, 2024-04-24 14:00 - 15:00 | 206 Egan, 360 Huntington Ave, Boston, MA, 02115, United States
Join our empowering LinkedIn, CV, and Resume Workshop series any Wednesday from 2 pm to 3 pm ET. This collaborative space offers valuable tips and peer feedback to enhance your online profile and professional presence. This is a community learning initiative, and together, we strive to make our profiles better. Join this hybrid workshop series either in person in room 206 Egan or through Zoom.

eMerge Americas - The Premier Global Tech Conference + Expo
2024-04-18 - 2024-04-19
Join the COE Graduate Admissions team at the eMerge Americas Conference in Miami, FL! We’ll be at the Expo on both April 18 & 19 with our biggest booth yet! Come say hi and ask your questions about graduate school at Northeastern, including learning more about our newest campus in Miami!

Mock Interview: A CommLab Workshop Series
2024-04-18 14:00 - 15:00, 2024-04-25 14:00 - 15:00 | 206 Egan, 360 Huntington Ave, Boston, MA, 02115, United States
Join the CommLab every Thursday from 2-3pm ET, we’ll delve into the intricacies of interviews, unveiling effective tricks and preparation strategies for any interview scenario. Engage in an interactive setting as we dissect the overall interview experience, discuss common interview scenarios, and share insights on what to do during critical moments. Join this hybrid workshop series either in person in room 206 Egan or through Zoom.

Northeastern National Academy of Inventors Spring 2024 Meeting
2024-04-18 17:00 - 19:00 | Raytheon Amphitheater (240 Egan), 360 Huntington Ave, 240 Egan, Boston, MA, 02115, United States
Please join us for the National Academy of Inventors Northeastern Chapter Spring 2024 meeting.

With two dynamic speakers headlining the event, attendees will gain invaluable insights into the latest advancements shaping various industries.
Our first speaker, Shawn P. Williams, is a materials technologists specializing in Battery Thesis. He will unveil groundbreaking strategies aimed at revolutionizing technology and industry. Discover how the development of cutting-edge materials is driving enhanced performance, durability, and functionality across a multitude of applications, from electronics and aerospace to healthcare and construction.
Next, dive into the world of 3D printing with the Fortify general counsel, David R. Widom, as he discusses the innovative DCM platform. With its patented technology, this platform is transforming the additive manufacturing landscape by enhancing the performance of components. Learn how the seamless integration of aligned reinforcing fibers, magnetics, and DLP is paving the way for the creation of customized microstructures in high-resolution 3D printed composite parts.

Late Night Breakfast
2024-04-18 20:00 - 23:00
Late Night Breakfast is back! Hosted by NUCOE in partnership with Northeastern Dining, Northeastern Housing and Residential Life, and NU Resident Student Association, this one-night-only event is the perfect opportunity to take a break from studying and enjoy a crave-worthy and comforting meal. Complimentary tickets will be available for pick-up beginning April 10 (see details below) at Campus Crossroads in Curry Student Center—be sure to BRING YOUR HUSKY CARD! At that time, you can select which location you’d prefer to visit for Late Night Breakfast, while supplies last. Tickets are distributed ONE PER PERSON and are only available for a limited time. On the night of the event, show your ticket and Husky Card to the cashier upon entry to your specified location. Entry is not permitted without your ticket AND Husky Card.
Location: United Table at International Village and The Eatery at Stetson East. You may only visit one location (The Eatery OR United Table) for the event. No swipe will be taken for entry.
Ticket Distribution (Campus Crossroads, CSC):
April 10 — 11:00 am – 3:00 pm
April 11 — 5:00 pm – 7:00 pm
April 12, — 11:00 am – 1:00 pm
(Tickets are now sold out).

Ruopeng Jia MS Thesis Defense
2024-04-19 14:00 - 17:00
Announcing:
MS Thesis Defense
Name:
Ruopeng Jia
Title:
Engineering Super-modes of Coupled Ring Resonator Arrays
Date:
4/19/2024
Time:
2:00:00 PM
Committee Members:
1) Sunil Mittal (Advisor)
2) Prof. Yongmin Liu
3) Prof. Ghosh Siddhartha
Abstract:
In the past year of learning and research, we have mastered the ability to analyze and modulate various resonant ring structures using Hamiltonian operators. Using genetic optimization algorithms, we have achieved a precisely controllable four wave mixing process under simulated conditions.

GSE Spring 2024 Wonder Week: Bioengineering
2024-04-22 09:00 - 09:45
In this webinar you’ll learn about bioengineering and how this field strives to create an atmosphere of innovation and creativity that fosters excellence in instruction and research and provides a foundation for programs that drive forward the cutting edge of knowledge while establishing translational collaborations with clinical and industrial researchers.

GSE Spring 2024 Wonder Week: Mechanical & Industrial Engineering
2024-04-22 10:00 - 10:45
In this webinar you’ll learn about the mechanical and industrial engineering graduate programs at Northeastern University. You’ll learn about our experiential graduate programs including interdisciplinary research opportunities and world-renown co-op.

CommLab Writing Hours
2024-04-22 11:00 - 13:00 | 335 CSC, 360 Huntington Ave, CSC, Boston, MA, 02115, United States
Graduate students, are you looking for a place for focused research writing time? Join the CommLab for writing hours on Mondays from 11 am-1 pm ET. Drop in any Monday and stay for a short time or the whole two hours. CommLab Fellows will be available to provide feedback on your writing. We will be meeting in 335 Curry Student Center.

ODSC East 2024
2024-04-23 - 2024-04-25
Join COE Graduate Admissions at the Open Data Science Conference in Boston, MA! Ask your questions about our graduate engineering programs across the U.S. and Canada during the Expo Hall on April 25th. We look forward to meeting you there!

GSE Spring 2024 Wonder Week: Telecommunications Networks & Cyber Physical Systems
2024-04-23 08:00 - 08:45
In this webinar, you will learn about the Master of Science in Telecommunication Networks and the Master of Science Cyber-Physical Systems graduate programs and how you’ll become a prepared professional to address complex, and ever-evolving engineering challenges.

GSE Spring 2024 Wonder Week: Product Development
2024-04-23 11:00 - 11:45
In this webinar you’ll learn more about the growing demand for product development and why it is the key to the success of businesses and the technology sector as it continues to fuel the world economy.

LeetCode Mock Interviews - A CommLab Workshop
2024-04-23 14:00 - 15:00
Join the CommLab any Tuesday from 2-3 PM for our weekly LeetCode Mock Interview Workshop via Zoom. This workshop is tailored towards programming jobs and prior coding knowledge is expected. Boost your LeetCode problem-solving confidence for interviews by building your speaking skills while solving programming problems.

GSE Spring 2024 Wonder Week: Robotics
2024-04-24 08:00 - 09:00
In this webinar you’ll learn about how you will gain a comprehensive understanding of the algorithms, sensors, control systems, and mechanisms used in robotics to help them stand out in the field and make transformative impact on society.

GSE Spring 2024 Wonder Week: MS in Information Systems, MS in Information Systems Bridge, MS in Software Engineering, MS in Data Architecture and Management
2024-04-24 09:00 - 09:45
In this webinar you’ll learn about the Master of Science in Information Systems, Master of Science in Information Systems Bridge, Master of Science in Data Architecture and Management, and Master of Science in Software Engineering Systems. You’ll learn how each of these program’s learning opportunities to develop the skills needed to create innovative, practical, and effective solutions that can be easily applied to current professional challenges.

GSE Spring 2024 Wonder Week: Electrical & Computer Engineering
2024-04-24 11:00 - 11:45
In this webinar you’ll learn more about the electrical and computer engineering graduate program including interdisciplinary research opportunities and a world-renowned co-op program.

CareerEco Engineering Grad School Virtual Fair
2024-04-24 11:00 - 15:00
Join the COE Graduate Admissions team at CareerEco’s virtual Engineering Grad School Fair! We’ll be there to answer your questions about the Graduate School of Engineering and its programs at Northeastern.
Register

Gordon Institute Virtual Information Session
2024-04-24 17:30 - 18:30
Learn how you can earn a Graduate Certificate in Engineering Leadership as a stand-alone certificate or in combination with one of twenty-three Master of Science degrees offered through Northeastern’s College of Engineering, College of Science, or Khoury College of Computer Sciences.
The National Academy of Engineering recognized The Gordon Institute of Engineering Leadership (GIEL) for its innovative curriculum that combines technical education, leadership capabilities, and the “Challenge Project”: an opportunity for students to receive master’s level credit while working in industry.
By aligning technical proficiency with leadership capabilities, GIEL accelerates the development of high-potential engineers and prepares them to lead complex projects early in their careers. Upon completing the program, more than 88% of the 2022 class reported increased leadership responsibility, while more than 50% of the 2022 class reported being promoted within one year of graduation.
Our Director of Admissions will answer your application questions for Fall 2024.
You will be able to hear from alumni about how The Gordon Institute propelled their engineering careers. Program professors will also be present to answer curriculum questions.

GSE Spring 2024 Wonder Week: Chemical Engineering
2024-04-25 09:00 - 09:45
In this webinar you’ll learn about the chemical engineering graduate program and the cutting-edge research you can be a part of that’s tackles pressing challenges facing our society and our planet in areas such as biomedicine, energy, security, and sustainability.

Shweta Singh PhD Dissertation Defense
2024-04-25 09:30 - 12:30
Announcing:
PhD Dissertation Defense
Name:
Shweta Singh
Title:
A Qualitative Approach for Learning and Detection of Emergent Behaviors
Date:
4/25/2024
Time:
9:30:00 AM
Committee Members:
Prof. Mieczyslaw M. Kokar (Advisor)
Prof. Taskin Padir
Dr. Paul Kogut
Abstract:
Emergence has been studied in various fields, including engineering, computer science, and economics. However, there is no agreed-upon definition of what emergence means. As a result, it remains a debatable topic among researchers who want to understand and use emergence to engineer their systems. In this thesis, we are targeting two issues related to the domain of emergence.
First, we introduce a framework that enables researchers to encode key aspects of emergence theories into an ontology using the Emergence Metaontology. This metaontology provides the basic vocabulary specialized to the domain of emergence. Researchers will be able to add their theories to those that are already encoded, and then use queries to examine and compare these theories. OWL reasoners can infer new facts and possibly identify inconsistencies between conflicting theories. This will allow researchers to gain a greater understanding of the existing emergence theories. To the best of our knowledge, this research is the first attempt in the emergence domain to use a query-supported ontological approach to encode and compare multiple theories of emergence.
The second contribution is algorithms for detecting the onset of emergence at the beginning of a possibly irreversible emergent behavior. The approach to accelerate the detection of emergence is based on transforming the values of the variables of a system into a different space and then running detection in that space. The first transformation relies on the property of self-similarity – when the values of system variables are in a specific relation. Such relations formalize hypersurfaces in the quantitative system space. The second kind of transformation utilizes qualitative abstraction of the general dynamical system using the $Q^2$ (Quantitative-Qualitative) approach. The quantitative variables of a general dynamical system are mapped to qualitative variables (hypersurfaces), leading to the representation of the monitored dynamical system as a Qualitative Dynamical system (QDS). Detection of emergence is then implemented as a process of analyzing the behavior of the QDS. The efficiency of the approach has been validated on multiple simulations of dynamical systems.

GSE Spring 2024 Wonder Week: Pharmaceutical Engineering
2024-04-25 10:00 - 10:45
In this webinar you’ll learn about the pharmaceutical engineering graduate program and the unique blend of advanced skills in state-of-the art pharmaceutical design, manufacturing process engineering, regulatory and quality issues to meet the evolving and growing needs of the biotechnology industry.

GSE Spring 2024 Wonder Week: Internet of Things & Wireless and Network Engineering
2024-04-25 11:00 - 11:45
In this webinar you’ll learn from experts from the Institute for Wireless Internet of Things as they dive deep into the Master of Science in Internet of Things and the Master of Science in Wireless and Network Engineering programs and how they relate to their vision of a future in which people and their environment are wirelessly connected by a continuum of AI-powered devices and networks, from driverless cars and search-and-rescue drone swarms to implantable medical devices and smart cities.

GSE Spring 2024 Wonder Week: Disciplinary Co-op
2024-04-26 09:00 - 09:45
Be prepared to learn more about Northeastern’s co-op program for graduate engineering students. A member of our admissions team, and the Assistant Dean & Senior Co-op Coordinator, Lorraine Mountain will be present and answer questions.

GSE Spring 2024 Wonder Week: MGEN Co-op
2024-04-26 10:00 - 10:45
Be prepared to learn more about Northeastern’s multidisciplinary co-op program for graduate engineering students. The webinar will feature a presentation by Associate Co-op Coordinator & Associate Director Laura Meyer.

GSE Spring 2024 Wonder Week: Civil & Environmental Engineering
2024-04-26 11:00 - 11:45
In this webinar you’ll learn about the civil and environmental engineering graduate programs and how you’ll become a prepared professional to address the global, complex, and ever-evolving engineering challenges of our time by building on current department strengths and expanding into vital areas.
