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Keiji Nagatani

8 accepted papers

2024

Design of a Multi-robot Coordination System based on Functional Expressions using Large Language Models

IROS 2024poster

A system is expected to facilitate coordination among multiple construction machines or robots, enabling them to adaptively perform various tasks in disaster sites and unknown environments. Prior research has generally adopted a model-based approach to designing cooperative behavior. However, it is…

Cited by 1SourceScholar
2021

Semantic Mapping of Construction Site From Multiple Daily Airborne LiDAR Data

RA-L 2021

Semantic maps are an important tool to provide robots with high-level knowledge about the environment, enabling them to better react to and interact with their surroundings. However, as a single measurement of the environment is solely a snapshot of a specific time, it does not necessarily reflect t

Cited by 9SourceScholar
2020

Improvement in Measurement Area of 3D LiDAR for a Mobile Robot Using a Mirror Mounted on a Manipulator

RA-L 2020

Light Detection and Ranging (LiDAR) is widely employed in mobile robots to acquire environmental information. However, it has a limited laser irradiation direction and cannot measure the backside of an object. In this study, a method that expands the LiDAR measurement range to various directions usi

Cited by 6SourceScholar
2020

Prediction of Backhoe Loading Motion via the Beta-Process Hidden Markov Model

IROS 2020poster

Backhoe loads sediment onto the bed of dump trucks during earthmoving work. The prediction of backhoe loading time is essential for ensuring safe cooperation between the backhoe and dump trucks. However, it is difficult to predict the instant at which the backhoe is ready to load sediment, because o…

Cited by 9SourceScholar
2019

Basic Performance of Planar Omnidirectional Crawler during Direction Switching using Disturbance Degree of Ground Evaluation Method

IROS 2019poster

We introduced the disturbance degree of ground and proposed an evaluation method to measure the mobile performance of a crawler on soft ground during direction switching. First, we developed a planar omnidirectional crawler, which had a configuration with two left and right unit crawlers for perform…

Cited by 4SourceScholar
2017

Design and development of a tethered mobile robot to traverse on steep slope based on an analysis of its slippage and turnover

IROS 2017poster

Observations of fumaroles are important in forecasting volcanic eruptions. However, such observations are dangerous for humans because of volcanic gases and high-temperature steam that surround fumaroles. In previous study, a teleoperated mobile robot was developed to realize remote observations. Ho…

Cited by 9SourceScholar
2016

Measurement of stress distributions of a wheel with grousers traveling on loose soil

ICRA 2016

A wheeled mobile robot traveling on loose soil has wheels with grousers (i.e., lugs) on their surface to improve its mobility performance. Although previous studies have analysis and modeling of the mobility performance of a wheel with grousers, most of them did not cover the stress distribution of

Cited by 9SourceScholar
2016

Thrust loss saving design of overlapping rotor arrangement on small multirotor unmanned aerial vehicles

ICRA 2016

Small multirotor unmanned aerial vehicles (UAVs) are suitable for surveillance or inspection operations, such as disaster site observations or building inspections, as they can hover. Therefore, engineers and associations plan to use them for civilian applications. However, the payload capacity of c

Cited by 26SourceScholar