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Distributed Online Adaptive Gradient Descent With Event-Triggered Communication

Abstract

This article proposes an event-triggered adaptive gradient descent method for distributed online optimization with a constraint set. In the proposed method, a group of agents cooperatively minimizes a dynamic regret, which is a cumulative loss for estimations of agents against an optimal strategy. The adaptive learning rate of the online algorithm is adjusted using the second moment of the gradient. We consider an event-triggered approach to reduce unnecessary communication. The local communication between agents is performed when the error between the last triggered estimation and the current estimation exceeds a trigger threshold. We show that the proposed algorithm achieves a sublinear regret bound if a path variation of the dynamic optimal strategy is sufficiently small. We also show that the convergence performance is comparable to the time-triggered case while the number of communications is effectively reduced by appropriately setting the threshold for the event-triggered communication.

article Article

date_range 2024

language English

link Link of the paper

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Okamoto Koki

Hayashi Naoki

Takai Shigemasa

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Featured Keywords

Optimization

Heuristic algorithms

Cost function

Estimation

Symmetric matrices

Network systems

Multi-agent systems

Cooperative control

distributed optimization

multiagent network

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Assessment of reinforced concrete building damages following the Kahramanmaraş earthquakes in Malatya, Turkey (February 6, 2023)

Abstract

Earthquakes of magnitude Mw = 7.7 and Mw = 7.6 hit the city of Kahramanmaraş (Turkey) on 6 February 2023. These earthquakes caused serious damage in 11 provinces in Turkey resulting in over 50,000 deaths and huge economic losses with the collapse of thousands of buildings. Two consecutive devastating earthquakes have severely damaged the reinforced concrete building stock located in Malatya. There are many reasons reinforced concrete structures suffer damage under the influence of seismic loads. These reasons can be listed as material and section properties that do not comply with earthquake codes, workmanship defects, ground parameters that are not considered and design errors, as seen in field investigations after earthquakes in Turkey in the past. In this research, a field study was conducted on reinforced concrete buildings damaged after the earthquakes in Malatya province. The causes of structural damages in reinforced concrete buildings between 6–26 years of age were assessed in terms of design and material defects. The structural damages were mainly caused due to insufficient stirrups in structural members, short column, strong beam–weak column, failures of infill walls, soft story type collapse, poor concrete quality, and reinforcement corrosion. In addition to the field investigation, the spectrum relationships created using raw acceleration data obtained from DEMP (Disaster and Emergency Management Presidency) stations in Malatya province were compared with the design response spectra.

article Article

date_range 2024

language English

link Link of the paper

Collapsed buildings

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