News & EventsDepartment Events & Announcements
Events
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Nov2
EVENT DETAILS
lessMonday / CS Seminar
November 2 / 12:00 PM
Hybrid / Mudd 3514Speaker
Farzaneh Derakhshan, Northwestern UniversityTalk Title
Quantitative Security Guarantees for Concurrent SystemsAbstract
Modern software is built from components that interact with each other: processes exchanging messages, threads sharing GPU memory, and AI agents coordinating with one another. Classical security guarantees for such systems are all-or-nothing: a program either leaks secret information or it does not. In practice, however, almost every system leaks some information, so the real question is how much.
In this talk, I will present a type-based (and logic-based) compositional approach to measuring information leakage in concurrent programs. The centerpiece is our recent work on session types, a type discipline that describes communication protocols of message-passing processes. I will show how well-typed probabilistic programs give rise to probability distributions over communication traces, and explain how these distributions let us measure how much an active attacker can gain by interacting with a system: observing the public communications and adapting her strategy based on the messages she receives from the program. I will then briefly discuss how similar ideas, via relational reasoning, can be adapted to GPU programs, where our relational Hoare logic bounds the difference in resource usage between executions with different secrets, quantifying resource usage as a side channel in CUDA kernels. I will close with future directions on extending these guarantees to systems that mix verified and tested components, including black boxes such as third-party services, whose internals we cannot verify but whose interactions we can observe.
Biography
Farzaneh Derakhshan is a Research Assistant Professor in the Department of Computer Science at Northwestern University. Her research is in programming languages, formal methods, and language-based security, with a focus on quantitative and compositional reasoning about concurrent systems. Before joining Northwestern, she was an Assistant Professor of Computer Science at Illinois Institute of Technology and a postdoctoral fellow at Carnegie Mellon University, where she also received her PhD in Pure and Applied Logic, advised by Frank Pfenning. Her work has appeared or is forthcoming at venues including POPL, LICS, OOPSLA, CSF, and ESOP, and is supported by the National Science Foundation.Research Area/Interest: programming languages, formal methods, language-based security
TIME Monday, November 2, 2026 at 12:00 PM - 1:00 PM
LOCATION 3514, Mudd Hall ( formerly Seeley G. Mudd Library) map it
CONTACT Wynante R Charles wynante.charles@northwestern.edu EMAIL
CALENDAR Department of Computer Science (CS)
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Nov2
EVENT DETAILS
lessHigh-stakes applications, such as medicine and defense, increasingly rely on processing sensitive data held by multiple organizations. However, those organizations are often unwilling or unable to share their data due to privacy concerns and regulations, such as HIPAA and GDPR. For example, during COVID-19, the NIH needed statistics from hospitals to support public health analytics, but sharing patient records could expose personal information. Secure collaborative analytics (SCA) enables multiple mutually distrustful data providers to jointly answer SQL queries over the union of their private records without revealing them to anyone. Cryptographic techniques, such as zero-knowledge proofs (ZKPs) and secure multi-party computation (MPC), protect data privacy and verify the integrity of query answers in SCA, but applying them to query evaluation efficiently and at scale is not trivial.
My doctoral research builds database management systems with efficient, scalable, and trustworthy query evaluation for SCA. As my first project, ZKSQL lets a single data provider prove to a client with ZKPs that its query answers are correct and complete with respect to its committed private records. It verifies sorts and joins efficiently with multisets. Next, RESCU-SQL lets mutually distrustful computing parties work together to evaluate queries under MPC, ensuring malicious security against a dishonest majority, aided by a lightweight trusted coordinator to make the execution more efficient. To scale SCA to more data and providers, CASTLE marries these two approaches into a single workflow. First, each provider concurrently evaluates operations over its private records locally and proves the intermediate results to others with ZKPs. CASTLE then runs an authenticated bridge protocol to convert these results into certified inputs for joint evaluation under MPC. It realizes the local and joint phases with ZKSQL and RESCU-SQL. This framework guarantees end-to-end integrity from the committed source records to the final query answer.TIME Monday, November 2, 2026 at 1:00 PM - 3:00 PM
LOCATION 3501, Mudd Hall ( formerly Seeley G. Mudd Library) map it
CONTACT Jensen Smith jensen.smith@northwestern.edu EMAIL
CALENDAR Department of Computer Science (CS)
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Nov3
EVENT DETAILS
lessResearch in the natural sciences increasingly depends on computational simulations,
high-resolution imaging, and complex software. However, expensive calculations,
labor-intensive image interpretation, and inadequate software documentation can limit the pace
and accessibility of research. This dissertation investigates how machine learning can address
these bottlenecks through three complementary directions: predicting scientific quantities
efficiently, explaining model behavior, and automating supporting computational tasks. Materials
science provides the principal application domain, complemented by a general-purpose tool for
software documentation.
For efficient prediction of material behavior, we develop supervised learning models that
reconstruct bilinear approximations of orientation-dependent stress–strain curves from features
obtained after a single crystal plasticity finite element simulation step. Using datasets of 100
complete curves per material, the framework achieves mean absolute relative errors of 1.43\%
for aluminum, 1.53\% for nickel, and 2.86\% for copper, with an estimated speedup of
approximately 4,000-fold for nickel. We then address structural characterization by learning
lattice parameters directly from simulated scanning transmission electron microscopy images of
two-dimensional materials. Evaluated on JARVIS-2D, the Computational 2D Materials Database
(C2DB), and an Alexandria-derived dataset, DenseNet121 predicts lattice lengths and angles,
achieving mean absolute errors of 0.17 Å and 0.19 Å for the two in-plane lattice constants on
the full C2DB test set. A separate classification model achieves 96\% Bravais lattice
classification accuracy on the Alexandria-derived dataset.
Extending image-based prediction to multimodal generation, we benchmark Llama~3, Qwen~2,
and Gemma~3 vision-language models adapted using quantized low-rank fine-tuning to
generate structural descriptions from microscopy images and chemical-composition prompts.
On the subset of C2DB test samples with correctly predicted stoichiometry,
Llama 3 achieves mean absolute errors of \(0.32\,\text{\AA}\),
\(0.39\,\text{\AA}\), and
γ
4. 19◦ 𝑎 𝑏
for , , and
, respectively. Distributional analyses and preliminary experimental-image tests further
characterize the models' capabilities and limitations.
To investigate the evidence underlying image-based decisions, we introduce XNano, an
explainability study comparing raw-image and preprocessed nanoparticle classifiers on 3,590
test images. Attribution maps and region-level integrated-gradient analyses suggest that
preprocessing changes the representation used for classification, including particle and
boundary features. The preprocessed model achieves higher accuracy despite weaker
particle-to-background attribution-density contrast, while some previously correct predictions
become errors. These findings motivate evaluating model behavior alongside aggregate
predictive performance.
Finally, ReadmeReady combines retrieval-augmented generation, configurable language
models, and optional parameter-efficient fine-tuning to produce repository documentation from
source code. Experiments demonstrate its utility for generating initial documentation while
showing that resource-constrained fine-tuning does not consistently improve quality. Together,
these contributions illustrate how machine learning can accelerate materials modeling and
characterization, support scrutiny of automated decisions, and assist the software workflows on
which computational research depends.TIME Tuesday, November 3, 2026 at 10:00 AM - 12:00 PM
LOCATION L440 - ECE Conference Room, Technological Institute map it
CONTACT Jensen Smith jensen.smith@northwestern.edu EMAIL
CALENDAR Department of Computer Science (CS)
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Nov9
EVENT DETAILS
lessMonday / CS Seminar
November 9 / 12:00 PM
Hybrid / Mudd 3514Speaker
Mohit Bansal, UNC Chapel HillTalk Title
AI Challenges: Trustworthy Collaboration, World Discovery, and Long-Horizon MemoryAbstract
In this talk, I will discuss 3 major pitfalls and challenges of current state-of-the-art AI agents, and present potential solutions for: (1) Teaching agents to be trustworthy and reliable collaborators based on: social/pragmatic multi-agent interactions via speaker-listener confidence calibration, learning to balance positive and negative persuasion, and multi-agent AI safety through the lens of compositional attacks, theory-of-mind, and belief-steering; (2) Discovering and improving skills/world models needed for efficient, robust action and collaboration based on: discovering reusable programmatic skills (including for multi-agent setups), weakness-driven adaptive data/environment generation for skill improvement, and structured world model discovery and inference; (3) Planning of long-horizon memory for multi-step reasoning and generation over continuously evolving, conflicting, and scattered information. We will cover diverse domains (math, commonsense, coding, tool-use, computer use, embodied actions, etc.), modalities (text, images, videos, audio, gaze, layouts, etc.), and real-world applications (early medical diagnosis and classroom education engagement).Biography
Dr. Mohit Bansal is the John R. & Louise S. Parker Distinguished Professor, Director of the MURGe-Lab (UNC-AI Group), and Core AI Lead of the ENGAGE NSF-AI Institute in the Computer Science department at UNC Chapel Hill. He received his PhD from UC Berkeley and his BTech from IIT Kanpur. His research expertise is in multimodal generative models, reasoning and planning agents, faithful language generation, and interpretable, efficient, and generalizable deep learning. He is an ACL and AAAI Fellow and recipient of the Presidential Early Career Award for Scientists and Engineers (PECASE), IIT Kanpur Young Alumnus Award, DARPA Director's Fellowship, NSF CAREER Award, Google Focused Research Award, Microsoft Investigator Fellowship, Army Young Investigator Award (YIP), DARPA Young Faculty Award (YFA), and outstanding paper awards at ACL, CVPR, EACL, COLING, CoNLL, and TMLR. He has been a keynote speaker for the IEEE/CVF WACV 2027, IEEE MLSP 2026, ECAI 2025, ACM-CODS 2025, AACL-IJCNLP 2023, CoNLL 2023, and INLG 2022 conferences. His service includes EMNLP Program Co-Chair, Associate Editor-in-Chief for TPAMI, CoNLL Program Co-Chair, ACL Executive Committee, ACM Doctoral Dissertation Award Committee, ACL Doctoral Dissertation Award Co-Organizer, ACL Mentorship Program Co-Founder, and Associate Editor for ACM AI Letters, TACL, CL, IEEE/ACM TASLP, and CSL journals. Webpage: https://www.cs.unc.edu/~mbansal/Research Interest/Area: AI, NLP, CV, ML
TIME Monday, November 9, 2026 at 12:00 PM - 1:00 PM
LOCATION 3514, Mudd Hall ( formerly Seeley G. Mudd Library) map it
CONTACT Wynante R Charles wynante.charles@northwestern.edu EMAIL
CALENDAR Department of Computer Science (CS)
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Nov16
EVENT DETAILS
lessRegular registration for Winter quarter begins
TIME Monday, November 16, 2026
CONTACT Office of the Registrar nu-registrar@northwestern.edu EMAIL
CALENDAR University Academic Calendar
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Nov19
EVENT DETAILS
lesstba
TIME Thursday, November 19, 2026 at 9:00 AM - 11:00 AM
LOCATION 3514, Mudd Hall ( formerly Seeley G. Mudd Library) map it
CONTACT Wynante R Charles wynante.charles@northwestern.edu EMAIL
CALENDAR Department of Computer Science (CS)
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Nov20
EVENT DETAILS
lessDissertation, PhD Final Exam, and change of grade forms due to TGS for Fall PhD candidates
TIME Friday, November 20, 2026
CONTACT Office of the Registrar nu-registrar@northwestern.edu EMAIL
CALENDAR University Academic Calendar
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Nov25
EVENT DETAILS
lessThanksgiving Vacation begins at 6:00 PM (No classes, University offices closed)
TIME Wednesday, November 25, 2026
CONTACT Office of the Registrar nu-registrar@northwestern.edu EMAIL
CALENDAR University Academic Calendar
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Nov30
EVENT DETAILS
lessFall Classes Resume
TIME Monday, November 30, 2026
CONTACT Office of the Registrar nu-registrar@northwestern.edu EMAIL
CALENDAR University Academic Calendar
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Dec4
EVENT DETAILS
lessTBA
TIME Friday, December 4, 2026 at 12:00 PM - 2:00 PM
CONTACT Wynante R Charles wynante.charles@northwestern.edu EMAIL
CALENDAR Department of Computer Science (CS)
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Dec5
EVENT DETAILS
lessFall classes end
TIME Saturday, December 5, 2026
CONTACT Office of the Registrar nu-registrar@northwestern.edu EMAIL
CALENDAR University Academic Calendar
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Dec7
EVENT DETAILS
lessFall Exams begin
TIME Monday, December 7, 2026
CONTACT Office of the Registrar nu-registrar@northwestern.edu EMAIL
CALENDAR University Academic Calendar
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Dec9
EVENT DETAILS
lessInformation systems have become the cornerstone of how decisions are made in nearly every domain of human activity, constituting the infrastructure through which knowledge is accessed and acted upon. At their core, an information system is any integrated combination of hardware, software, databases, networks, and human expertise organized to collect, process, store, and analyze information in support of operations and decision-making. The usability of such systems in practice is governed by two properties that have historically stood in tension: accuracy and fluency. Symbolic, query-based systems offer high accuracy but require specialized query languages or code to interact with effectively, while large language model (LLM)-based systems are fluent and accessible through natural language but remain prone to hallucination and factual error. The goal of this dissertation is twofold: to build information systems that answer questions and generate reports from data both accurately and fluently, and to generate training data that improves the accuracy and fluency of such systems, in both cases by using structured knowledge and rules as a source of ground truth for language generation.
To this end, this dissertation introduces a neurosymbolic framework, grounded in knowledge representations of data and analytics, that first produces language outputs that are accurate but not necessarily fluent, and then uses these outputs to condition LLM generation, yielding final outputs that are both accurate and fluent. These outputs can serve two roles: as the final product delivered to a user, or as training data for the models that later serve users. This framework is first demonstrated through Satyrn, a report generation system in which domain-independent report blueprints produce accurate but coarse information that is then used to condition LLMs, jointly producing reports that are more factual, fluent, and coherent than those generated by existing neural methods. The framework is then applied to training data generation through RingSQL, a platform that combines these knowledge representations with LLM-based paraphrasing to produce text-to-SQL training data that is as diverse and fluent as LLM-generated data while remaining more accurate and faithful to the underlying query. Data generated with RingSQL provides a stronger training signal than data produced with prior LLM-based methods, template-based methods, and even human-annotated data. Finally, this dissertation introduces methods for grounding the generation of reasoning traces in verifiable, rule-based evaluation, and uses these traces in a mixed-policy reinforcement learning setting, offering an additional path toward improving the accuracy of LLM-based information systems. Together, these contributions demonstrate that structured knowledge and language are complementary, and that unifying them can reconcile the accuracy-fluency trade-off in information systems.TIME Wednesday, December 9, 2026 at 6:00 PM - 8:00 PM
CONTACT Jensen Smith jensen.smith@northwestern.edu EMAIL
CALENDAR Department of Computer Science (CS)
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Dec12
EVENT DETAILS
lessFall exams end
TIME Saturday, December 12, 2026
CONTACT Office of the Registrar nu-registrar@northwestern.edu EMAIL
CALENDAR University Academic Calendar
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Dec12
EVENT DETAILSmore info
lessThe ceremony will take place on Saturday, December 12 in Pick-Staiger Concert Hall, 50 Arts Circle Drive.
TIME Saturday, December 12, 2026 at 4:00 PM - 6:00 PM
LOCATION Pick-Staiger Concert Hall map it
CONTACT Andi Joppie andi.joppie@northwestern.edu EMAIL
CALENDAR McCormick School of Engineering and Applied Science
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Dec24
EVENT DETAILS
lessWinter Recess Starts - University Closed Through January 1st, 2027
TIME Thursday, December 24, 2026
CONTACT Office of the Registrar nu-registrar@northwestern.edu EMAIL
CALENDAR University Academic Calendar