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Reconstructing Action-Conditioned Human-Object Interactions Using Commonsense Knowledge Priors
(2022)2022 International Conference on 3D Vision (3DV)We present a method for inferring diverse 3D models of human-object interactions from images. Reasoning about how humans interact with objects in complex scenes from a single 2D image is a challenging task given ambiguities arising from the loss of information through projection. In addition, modeling 3D interactions requires the generalization ability towards diverse object categories and interaction types. We propose an action-conditioned ...Conference Paper -
TempCLR: Reconstructing Hands via Time-Coherent Contrastive Learning
(2022)2022 International Conference on 3D Vision (3DV)We introduce TempCLR, a new time-coherent contrastive learning approach for the structured regression task of 3D hand reconstruction. Unlike previous time-contrastive methods for hand pose estimation, our framework considers temporal consistency in its augmentation scheme, and accounts for the differences of hand poses along the temporal direction. Our data-driven method leverages unlabelled videos and a standard CNN, without relying on ...Conference Paper -
Climate Change Mitigation: The Contribution of Carbon Capture and Utilisation (CCU)
(2022)SSRN Electronic Journal ~ Proceedings of the 16th Greenhouse Gas Control Technologies Conference (GHGT-16)Carbon Capture and Utilisation (CCU) is a broad term that covers processes that capture CO2 from flue and process gases or directly from the air and convert it into a variety of products such as renewable electricity-based fuels, chemicals, and materials. No precise estimate of the potential mitigation role of CCU technologies exists to date, because of uncertainties in renewable electricity cost scenarios and the low granularity of models ...Conference Paper -
Debiasing Deep Chest X-Ray Classifiers using Intra- and Post-processing Methods
(2022)Proceedings of Machine Learning Research ~ Proceedings of the 7th Machine Learning for Healthcare ConferenceDeep neural networks for image-based screening and computer-aided diagnosis have achieved expert-level performance on various medical imaging modalities, including chest radiographs. Recently, several works have indicated that these state-of-the-art classifiers can be biased with respect to sensitive patient attributes, such as race or gender, leading to growing concerns about demographic disparities and discrimination resulting from ...Conference Paper -
Kernel-Based Identification of Local Limit Cycle Dynamics with Linear Periodically Parameter-Varying Models
(2022)2022 IEEE 61st Conference on Decision and Control (CDC)Limit cycle oscillations are phenomena arising in nonlinear dynamical systems and characterized by periodic, locally-stable, and self-sustained state trajectories. Systems controlled in a closed loop along a periodic trajectory can also be modelled as systems experiencing limit cycle behavior. The goal of this work is to identify from data, the local dynamics around the limit cycle using linear periodically parameter-varying models. Using ...Conference Paper -
Lithium-Niobate-Based Frequency-Agile Integrated Lasers
(2022)OSA Technical Digest ~ European Conference on Optical Communication (ECOC) 2022We demonstrate narrow-linewidth ultrafast tunable integrated lasers based on heterogeneously integrated thin-film lithium niobate on ultra-low loss silicon nitride integrated photonic circuits. Using self-injection locking of a hybrid microresonator, we achieve a tuning speed of > 10 peta-Hertz-per-second. We also perform FMCW LiDAR ranging experiments.Conference Paper -
>500 GHz Bandwidth Graphene Photodetector Enabling Highest-Capacity Plasmonic-to-Plasmonic Links
(2022)OSA Technical Digest ~ European Conference on Optical Communication (ECOC) 2022A novel vertical incidence metamaterial enhanced graphene photodetector featuring a 200 nm spectral window and a setup limited bandwidth of 500 GHz is demonstrated. The photodetector has been tested for data transmission in an all plasmonic EOE-link offering unprecedented 250 GHz bandwidth.Conference Paper -
216 GBd Plasmonic Ferroelectric Modulator Monolithically Integrated on Silicon Nitride
(2022)OSA Technical Digest ~ European Conference on Optical Communication (ECOC) 2022We demonstrate a 216 GBd plasmonic ferroelectric modulator monolithically integrated with a foundry-produced silicon nitride platform. The combination of low-loss waveguiding, nanoscale plasmonics, and strong Pockels coefficients in barium titanate offers a platform for next-generation optical interconnect systems.Conference Paper -
Infinite-Dimensional Sparse Learning in Linear System Identification
(2022)2022 IEEE 61st Conference on Decision and Control (CDC)Regularized methods have been widely applied to system identification problems without known model structures. This paper presents an infinite-dimensional sparse learning algorithm based on atomic norm regularization. Atomic norm regularization decomposes the transfer function into first-order atomic models and solves a group lasso problem that selects a sparse set of poles and identifies the corresponding coefficients. The difficulty in ...Conference Paper -
Plasmonic PICs — Terabit Modulation on the Micrometer Scale
(2022)OSA Technical Digest ~ European Conference on Optical Communication (ECOC) 2022Plasmonic PICs offer compact high-speed photonic and plasmonic components, enabling a new generation of scalable photonic system solutions. We explain the underlying technology, highlight key applications, review technology demonstrations, and discuss future opportunities.Conference Paper