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14th International Conference on Ubiquitous and Future Networks, ICUFN 2023

作者： Jeon, Seul-Bi Park, Heui-Seon Jo, Tae-Ho Hwang, Suk-Seung Chosun University Interdisciplinary Program in IT-Bio Convergence System Department of Electronic Engineering Gwangju Korea Republic of

ISBN: (纸本)9798350335385

Location Detection Technology (LDT), which accurately estimates the location of a mobile station (MS), is one of core techniques for the modern communication system. Among various LDTs, Time of arrival (TOA) and Time Difference of Arrival (TDOA) are the most commonly employed method, which calculates the location of MS based on at least three signals from base stations (BSs). In the urban environment, many repeaters have been installed for overcoming the radio shadow area problem of a receiver, but they cause the serious errors of the location estimation when we utilize signals passed through repeaters. In order to enhance this problem, in this paper, we introduce the combined location estimation approach with TDOA and TOA considering the repeater, based on signals from two repeaters and one BS. © 2023 IEEE.

关键词： Time difference of arrival

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Modeling and control of heterogeneous field robots under partial observation

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INFORMATION SCIENCES 2021年 580卷 419-435页

作者： Ju, Chanyoung Son, Hyoung, II [a]Department of Convergence Biosystems Engineering Chonnam National University Yongbong-ro 77 Gwangju 61186 Republic of Korea [b]Interdisciplinary Program in IT-Bio Convergence System Chonnam National University Yongbong-ro 77 Gwangju 61186 Republic of Korea

The control of large-scale dynamic systems, such as field robots, requires a more modular and scalable approach than traditional control theory. Recently, we designed modular supervisory controllers for field robots in agricultural applications based on a hybrid system that combines continuous-time and discrete-event systems. We verified that the developed hybrid system could control field robots and observe all the events while meeting the behavioral specifications. In contrast, all possible events cannot be monitored by a supervisor in a real-field robot system because of the presence of sensors, noise, disturbances, and failure. Therefore, in this study, we expanded the modular supervisor presented in previous studies by considering partial observations. Specifically, we proposed a process for designing an appropriate modular supervisor by considering the observability. The experimental results demonstrated that only observable events could cause state changes, verified by dynamic simulations representing a natural field environment. The effects of the proposed hybrid system-based modeling and control methodology are discussed in light of our systematic results. (c) 2021 Elsevier Inc. All rights reserved.

关键词： Heterogeneous field robots Supervisory control Hybrid dynamical system Discrete event system Partial observation

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bioinspired magnetic cilia:from materials to applications

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Microsystems & Nanoengineering 2023年第6期9卷 107-128页

作者： Seongjin Park Geonjun Choi Minsu Kang Woochan Kim Jangho Kim Hoon Eui Jeong Department of Mechanical Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan44919Republic of Korea Department of Convergence Biosystems Engineering Chonnam National UniversityGwangju61186Republic of Korea Interdisciplinary Program in IT-Bio Convergence System Chonnam National UniversityGwangju61186Republic of Korea

Microscale and nanoscale cilia are ubiquitous in natural systems where they serve diverse biological *** artificial magnetic cilia have emerged as a highly promising technology with vast potential applications,ranging from soft robotics to highly precise *** this review,we comprehensively discuss the roles of cilia in nature and the various types of magnetic particles utilized in magnetic cilia;additionally,we explore the top-down and bottom-up fabrication techniques employed for their ***,we examine the various applications of magnetic cilia,including their use in soft robotics,droplet and particle control systems,fluidics,optical devices,and ***,we present our conclusions and the future outlook for magnetic cilia research and development,including the challenges that need to be overcome and the potential for further integration with emerging technologies.

关键词： magnetic overcome precise

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The Combined Localization Based on TDOA and FDOA for High-Speed Moving Object 13

The Combined Localization Based on TDOA and FDOA for High-Sp...

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Joint 13th International Conference on Soft Computing and Intelligent systems and 25th International Symposium on Advanced Intelligent systems, SCIS and ISIS 2024

作者： Jeon, Seul-Bi Jo, Tae-Ho Park, Jong-Hwan Hwang, Suk-Seung Chosun University Interdisciplinary Program in IT-Bio Convergence System Dept. of Electronic Engineering Gwangju Korea Republic of Soletop Co. Ltd Satellite System Lab Daejeon Korea Republic of School of Electronic Eigineering Chosun University Interdisciplinary Program in IT-Bio Convergence System Gwangju Korea Republic of

ISBN: (纸本)9798350373332

Detecting the location of high-speed moving objects is a critical issue in various fields including the medical, emergence service, aerospace, defense areas, etc. In general, Time Difference of Arrival (TDOA) and Frequency Difference of Arrival (FDOA) techniques are primarily used for estimating the location of a moving object. Although these techniques provide excellent estimation performance for the stationary or low speed moving object, they may have significant location estimation errors for the high-speed object moving. In order to improve this problem, this paper introduces the combined localization method based on TDOA and FDOA for estimating the location of high-speed moving objects efficiently. © 2024 IEEE.

关键词： Time difference of arrival

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Therapeutic strategies of three-dimensional stem cell spheroids and organoids for tissue repair and regeneration

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bioactive Materials 2023年第1期19卷 50-74页

作者： Woochan Kim Yonghyun Gwon Sunho Park Hyoseong Kim Jangho Kim Department of Convergence Biosystems Engineering Chonnam National UniversityGwangju61186Republic of Korea Department of Rural and Biosystems Engineering Chonnam National UniversityGwangju61186Republic of Korea Interdisciplinary Program in IT-Bio Convergence System Chonnam National UniversityGwangju61186Republic of Korea

Three-dimensional(3D)stem cell culture systems have attracted considerable attention as a way to better mimic the complex interactions between individual cells and the extracellular matrix(ECM)that occur in ***,3D cell culture systems have unique properties that help guide specific functions,growth,and processes of stem cells(e.g.,embryogenesis,morphogenesis,and organogenesis).Thus,3D stem cell culture systems that mimic in vivo environments enable basic research about various tissues and *** this review,we focus on the advanced therapeutic applications of stem cell-based 3D culture systems generated using different engineering ***,we summarize the historical advancements of 3D cell culture systems and discuss the therapeutic applications of stem cell-based spheroids and organoids,including engineering techniques for tissue repair and regeneration.

关键词： 3D stem cell culture Spheroid Organoid Tissue repair Tissue regeneration

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Measurement of surface stress-strain distribution inside a grain of carbon steel via optical microscope

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Measurement 2025年 255卷

作者： I Dewa Made Oka Dharmawan Jinyi Lee Department of Control Instrumentation and Robot Engineering Graduate School of Chosun University Gwangju 61452 Republic of Korea Interdisciplinary Program in IT-BIO Convergence System Chosun University Gwangju 61452 Republic of Korea Department of Electronic Engineering Chosun University Gwangju 61452 Republic of Korea

The advancement of alloys and steel in engineering highlights the critical need for robust methods to ensure structural integrity. While traditional Non-Destructive Testing and Evaluation (NDT/E) techniques provide valuable insights, they often fail to detect pre-existing stress conditions that contribute to fatigue cracks. Recent approaches have addressed this limitation by analyzing stress and strain at the grain level using advanced measurement systems—often based on diffraction techniques—integrated with Finite Element Method (FEM) and Digital Image Correlation (DIC) platforms. However, the application of these techniques for in-service inspections remains limited by challenges in accessibility, cost, and scalability. To overcome these issues, an integrated 2D surface system combining optical microscopy with DIC and grain-level analysis within the FEM framework is proposed. This method enables efficient visualization of grain-level deformation and stress distribution, thereby providing deeper insights into the microstructural behavior of polycrystalline materials under external loads. The proposed methodology is theoretically outlined and validated through simulations and experimental analyses, demonstrating its potential as a practical solution for in-service inspections. Ultimately, this approach is expected to advance inspection techniques by offering an accessible and scalable tool for monitoring microstructural behavior and identifying potential failure mechanisms through surface analysis.

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Underwater Robot Navigation Through Compensation of Sensor Misalignment in Non-linear Space 23

Underwater Robot Navigation Through Compensation of Sensor M...

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23rd International Conference on Control, Automation and systems, ICCAS 2023

作者： Jeong, Da Bin Choi, Woong Ko, Nak Yong Interdisciplinary Program in IT- Bio Convergence System Graduate School Chosun University Department of Electronic Engineering Gwangju61452 Korea Republic of College of Ict Construction Welfare Convergence Kangnam University Gyeonggi-do16979 Korea Republic of Chosun University Interdisciplinary Program in IT-Bio Convergence System Department of Electronic Engineering Gwangju61452 Korea Republic of

ISBN: (纸本)9788993215274

This paper presents a novel approach to estimate and compensate for the misalignment between the Inertial Measurement Unit (IMU) and Doppler Velocity Log (DVL) sensors. Estimating the location and attitude of an ROV usually combines the attitude by IMU and the velocity by the DVL provided in the sensor coordinate system. The attitude is regarded as the attitude of the ROV and the velocity in the sensor coordinate frame is converted to the velocity in the inertial coordinate frame. Misalignment in the DVL and IMU causes errors in the converted velocity and results in the degradation of the navigation performance. The proposed method represents the misalignment using unit quaternion. Especially, the method utilizes the Lie theory to deal with the operations on unit quaternions which constitute a Lie group, called the 3-sphere group. Simulation and testing of the method in a marine environment validate its effectiveness and practical applicability. © 2023 ICROS.

关键词： Remotely operated vehicles

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Localization Algorithms for Drones in a Wireless Communication Environment with Presence of Data Missing 23

Localization Algorithms for Drones in a Wireless Communicati...

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23rd International Conference on Control, Automation and systems, ICCAS 2023

作者： Kim, Sin Shin, Sung Ko, Nak Yong You, Sung Hyun Chosun University Department of Electronic Engineering Gwangju61452 Korea Republic of Interdisciplinary Program in IT-Bio Convergence System Department of Electronic Engineering Korea Republic of

ISBN: (纸本)9788993215274

Drones are widely used in industries because drones perform tasks in various environments. Drones are highly utilized because drones are not affected by ground conditions. Estimating the position of the drone is important for the successful completion of the missions that are assigned to the drone. In wireless communication environments, data missing often occurs between the anchors serve as the transmitter and the drone-attached tag serves as the receiver. In this paper, we propose a localization algorithm that can accurately estimate the location of the drone in the case of data missing. The proposed algorithm can estimate the position of the drone using the residuals of the predicted measurements in the case of data missing. The proposed algorithm aimed to estimate the position of the drone in the case of data missing using distance information between the anchors and the drone-attached tag and verified the performance of the proposed algorithm through simulation. © 2023 ICROS.

关键词： Drones

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Vessel-position Tracking in 3-sphere Space Using an Interacting Multiple Model Based on Lie Theory

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Journal of Institute of Control, Robotics and systems 2024年第6期30卷 643-649页

作者： Jeong, Da Bin Ko, Nak Yong Department of Electronic Engineering Interdisciplinary Program in IT-Bio Convergence System Chosun University Korea Republic of

This paper proposes a method for tracking vessel positions using an interacting multiple model approach based on Lie theory in 3-sphere space. Attitude increments and errors are evaluated and corrected using Lie algebra, as well as exponential and logarithmic operations. The covariance of attitudes is appropriately represented in Lie algebra. The proposed method is compared with two methods, i.e., the unscented Kalman filter (UKF) in which the attitude is represented by a unit quaternion (quaternion-utilizing UKF) and the UKF with a single model that uses Lie theory (Lie theory-incorporating UKF). The quaternion-utilizing UKF represents the attitude using quaternions without incorporating Lie theory, whereas the Lie theory-incorporating UKF represents the attitude as a unit quaternion and utilizes Lie theory. The comparisons indicate that the proposed method effectively reduces tracking errors. Additionally, the proposed method adapts to changes in maneuvering conditions using optimized model probabilities, ensuring timely and appropriate responses. The robustness and effectiveness of the proposed method in various maneuvering scenarios demonstrate its potential for enhancing vessel tracking accuracy in real-world applications. © ICROS 2024.

关键词： Exponential functions

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A Location Estimation Algorithm Combined with TDOA and TOA Considering Repeaters

A Location Estimation Algorithm Combined with TDOA and TOA C...

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International Conference on Ubiquitous and Future Networks, ICUFN

作者： Seul-Bi Jeon Heui-Seon Park Tae-Ho Jo Suk-Seung Hwang Department of Electronic Engineering Interdisciplinary Program in IT-Bio Convergence System Chosun University Gwangju Korea Interdisciplinary Program in IT-Bio Convergence System School of Electronic Engineering Chosun University Gwangju Korea

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