arXiv subjects

Hossein Noorazar

Publications and source records attributed to Hossein Noorazar.

5 recordsLinked to original sources

arXiv2020

Data-driven Operation of the Resilient Electric Grid: A Case of COVID-19

Electrical energy is a vital part of modern life, and expectations for grid resilience to allow a continuous and reliable energy supply has tremendously increased even during adverse events (e.g., Ukraine cyber-attack, Hurricane Maria). The global pandemic COVID-19 has raised the electric energy reliability risk due to potential workforce disruptions, supply chain interruptions, and increased possible cybersecurity threats. The pandemic introduces a significant degree of uncertainly to the grid operation in the presence of other extreme events like natural disasters, unprecedented outages, aging power grids, high proliferation of distributed generation, and cyber-attacks. This situation increases the need for measures for the resiliency of power grids to mitigate the impacts of the pandemic as well as simultaneous extreme events. Solutions to manage such an adverse scenario will be multi-fold: a) emergency planning and organizational support, b) following safety protocol, c) utilizing enhanced automation and sensing for situational awareness, and d) integration of advanced technologies and data points for ML-driven enhanced decision support. Enhanced digitalization and automation resulted in better network visibility at various levels, including generation, transmission, and distribution. These data or information can be utilized to take advantage of advanced machine learning techniques for automation and increased power grid resilience. In this paper, a) we review the impact of COVID-19 on power grid operations and actions taken by operators/organizations to minimize the impact of COVID-19, and b) we have presented the recently developed tool and concepts using natural language processing (NLP) in the domain of machine learning and artificial intelligence that can be used for increasing resiliency of power systems in normal and in extreme scenarios such as COVID-19 pandemics.

cs.LG↗

arXiv2020

Recent advances in opinion propagation dynamics: A 2020 Survey

Opinion dynamics have attracted the interest of researchers from different fields. Local interactions among individuals create interesting dynamics for the system as a whole. Such dynamics are important from a variety of perspectives. Group decision making, successful marketing, and constructing networks (in which consensus can be reached or prevented) are a few examples of existing or potential applications. The invention of the Internet has made the opinion fusion faster, unilateral, and on a whole different scale. Spread of fake news, propaganda, and election interferences have made it clear there is an essential need to know more about these dynamics. The emergence of new ideas in the field has accelerated over the last few years. In the first quarter of 2020, at least 50 research papers have emerged, either peer-reviewed and published or on pre-print outlets such as arXiv. In this paper, we summarize these ground-breaking ideas and their fascinating extensions and introduce newly surfaced concepts.

physics.soc-ph↗

arXiv2020

Loss of community identity in opinion dynamics models as a function of inter-group interaction strength

Recent technological changes have increased connectivity between individuals around the world leading to higher frequency interactions between members of communities that would be otherwise distant and disconnected. This paper examines a model of opinion dynamics in interacting communities and studies how increasing interaction frequency affects the ability for communities to retain distinct identities versus falling into consensus or polarized states in which community identity is lost. We also study the effect (if any) of opinion noise related to a tendency for individuals to assert their individuality in homogenous populations. Our work builds on a model we developed previously [11] where the dynamics of opinion change is based on individual interactions that seek to minimize some energy potential based on the differences between opinions across the population.

cs.SI↗

arXiv2019

From classical to modern opinion dynamics

In this age of Facebook, Instagram and Twitter, there is rapidly growing interest in understanding network-enabled opinion dynamics in large groups of autonomous agents. The phenomena of opinion polarization, the spread of propaganda and fake news, and the manipulation of sentiment are of interest to large numbers of organizations and people, some of whom are resource rich. Whether it is the more nefarious players such as foreign governments that are attempting to sway elections or large corporations that are trying to bend sentiment -- often quite surreptitiously, or it is more open and above board, like researchers that want to spread the news of some finding or some business interest that wants to make a large group of people aware of genuinely helpful innovations that they are marketing, what is at stake is often significant. In this paper we review many of the classical, and some of the new, social interaction models aimed at understanding opinion dynamics. While the first papers studying opinion dynamics appeared over 60 years ago, there is still a great deal of room for innovation and exploration. We believe that the political climate and the extraordinary (even unprecedented) events in the sphere of politics in the last few years will inspire new interest and new ideas. It is our aim to help those interested researchers understand what has already been explored in a significant portion of the field of opinion dynamics. We believe that in doing this, it will become clear that there is still much to be done.

physics.soc-ph↗

arXiv2018

An energy-based interaction model for population opinion dynamics with topic coupling

We introduce a new, and quite general variational model for opinion dynamics based on pairwise interaction potentials and a range of opinion evolution protocols ranging from random interactions to global synchronous flows in the opinion state space. The model supports the concept of topic "coupling", allowing opinions held by individuals to be changed via indirect interaction with others on different subjects. Interaction topology is governed by a graph that determines interactions. Our model, which is really a family of variational models, has, as special cases, many of the previously established models for the opinion dynamics. After introducing the model, we study the dynamics of the special case in which the potential is either a tent function or a constructed bell-like curve. We find that even in these relatively simple potential function examples there emerges interesting behavior. We also present results of preliminary numerical explorations of the behavior of the model to motivate questions that can be explored analytically.

physics.soc-ph↗