Search Results for author: Nikolaos Gatsis

Found 6 papers, 0 papers with code

Assessing the Optimality of LinDist3Flow for Optimal Tap Selection of Step Voltage Regulators in Unbalanced Distribution Networks

no code implementations16 Oct 2022 Krishna Sandeep Ayyagari, Sherin Ann Abraham, Yiyun Yao, Shibani Ghosh, Francisco Flores-Espino, Adarsh Nagarajan, Nikolaos Gatsis

It is desirable to include tap selection of SVRs in optimal power flow (OPF) routines, a task that turns out to be challenging because the resultant OPF problem is nonconvex with added complexities stemming from accurate SVR modeling.

Rejection of Smooth GPS Time Synchronization Attacks via Sparse Techniques

no code implementations28 Feb 2021 Erick Schmidt, Junhwan Lee, Nikolaos Gatsis, David Akopian

The proposed method jointly estimates a dynamic solution for GPS timing and rejects behavior changes based on such sparse events.

Kernel-Based Learning for Smart Inverter Control

no code implementations10 Jul 2018 Aditie Garg, Mana Jalali, Vassilis Kekatos, Nikolaos Gatsis

Leveraging a linearized grid model and given anticipated data scenarios, inverter rules are jointly designed at the feeder level to minimize a convex combination of voltage deviations and ohmic losses via a linearly-constrained quadratic program.

Multi-Task Learning

Modern WLAN Fingerprinting Indoor Positioning Methods and Deployment Challenges

no code implementations18 Oct 2016 Ali Khalajmehrabadi, Nikolaos Gatsis, David Akopian

However, since WLAN has been initially designed for wireless networking and not positioning, the localization task based on WLAN signals has several challenges.

Structured Group Sparsity: A Novel Indoor WLAN Localization, Outlier Detection, and Radio Map Interpolation Scheme

no code implementations18 Oct 2016 Ali Khalajmehrabadi, Nikolaos Gatsis, David Akopian

This paper introduces novel schemes for indoor localization, outlier detection, and radio map interpolation using Wireless Local Area Networks (WLANs).

Indoor Localization Outlier Detection

A Joint Indoor WLAN Localization and Outlier Detection Scheme Using LASSO and Elastic-Net Optimization Techniques

no code implementations18 Oct 2016 Ali Khalajmehrabadi, Nikolaos Gatsis, Daniel Pack, David Akopian

Since the online measurements are subject to inordinate measurement readings, called outliers, the sparse recovery methods are modified in order to jointly estimate the outliers and user's position vector.

Outlier Detection Position

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