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International Conference on Control, Automation and systems ( ICCAS)

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

ISBN: (数字)9788993215380

ISBN: (纸本)9798331517939

This paper proposes a Dead-reckoning (DR) method for vehicles using Lie theory. This approach treats the pose (position and attitude) and velocity of the vehicle as elements of the Lie group SE 2 (3) and follows computations based on Lie theory. Previously widely used DR methods suffer from cumulative errors over time due to inaccuracies in the calculated changes from velocity during the motion of the vehicle or small errors in modeling assumptions. By treating the pose and velocity of the vehicle as elements of the Lie group, the proposed method allows for accurate solutions without errors introduced by linearization. Experimental results confirm that the proposed method improves the accuracy of DR, particularly as the motion prediction time interval of the vehicle increases.

关键词： Accuracy Dead reckoning Uncertainty Filters Pose estimation Linear approximation Lie groups Prediction algorithms Control systems Standards

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bioprinting Methods for Fabricating In Vitro Tubular Blood Vessel Models

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Cyborg and bionic systems 2023年第1期4卷 178-195页

作者： Seon-Jin Kim Min-Gyun Kim Jangho Kim Jessie SJeon Jinsoo Park Hee-Gyeong Yi Department of Rural and Biosystems Engineering College of Agriculture and Life SciencesChonnam National UniversityGwangjuRepublic of Korea Department of Convergence Biosystems Engineering College of Agriculture and Life SciencesChonnam National UniversityGwangjuRepublic of Korea Interdisciplinary Program in IT-Bio Convergence System Chonnam National UniversityGwangju 61186Republic of Korea Department of Mechanical Engineering Korea Advanced Institute of Science and TechnologyDaejeonRepublic of Korea Department of Mechanical Engineering Chonnam National UniversityRepublic of Korea

Dysfunctional blood vessels are implicated in various diseases,including cardiovascular diseases,neurodegenerative diseases,and *** studies have attempted to prevent and treat vascular diseases and understand interactions between these diseases and blood vessels across different organs and *** studies were conducted using 2-dimensional(2D)in vitro and animal ***,these models have difficulties in mimicking the 3D microenvironment in human,simulating kinetics related to cell activities,and replicating human pathophysiology;in addition,3D models involve remarkably high ***,in vitro bioengineered models(BMs)have recently gained *** created through biofabrication based on tissue engineering and regenerative medicine are breakthrough models that can overcome limitations of 2D and animal *** can also simulate the natural microenvironment in a patient-and target-specific *** this review,we will introduce 3D bioprinting methods for fabricating bioengineered blood vessel models,which can serve as the basis for treating and preventing various vascular ***,we will describe possible advancements from tubular to vascular ***,we will discuss specific applications,limitations,and future perspectives of fabricated BMs.

关键词： Blood organs printing

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An effective deep learning model for classifying diseases on strawberry leaves and estimating their severity based on the multi-task U‑Net

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Multimedia Tools and Applications 2024年 1-22页

作者： Nguyen, Dung Kim Choi, Yeong Soo Lee, Jang Hoon Tran, Minh Trieu Xin, XiangHui Department of Convergence Biosystems Engineering Chonnam National University Yongbong-ro 77 Gwangju61186 Korea Republic of Interdisciplinary Program in IT-Bio Convergence System Chonnam National University Yongbong-ro 77 Gwangju61186 Korea Republic of Agricultural Solutions BASF Korea Ltd Seoul04518 Korea Republic of Department of Artificial Intelligence Convergence Chonnam National University Yongbong- ro 77 Gwangju61186 Korea Republic of

Gray mold, powdery mildew and tip burn are common diseases on strawberries, directly or indirectly affecting annual strawberry yield. Due to the serious damage caused by these diseases, the identification to control them has attracted great attention for many years. This paper presents an effective method based on multi-task U-Net to distinguish types and estimate the severity of the diseases on strawberry leaves. A dataset of 2,130 images containing gray mold, powdery mildew, tip burn, and healthy leaves was collected. The proposed model performs three tasks including disease classification, segmentation of the infected regions, and segmentation of interested leaf regions to identify diseases and their severity. We investigated the proposed model and corresponding cascade structures with the backbones of the VGGNet, ResNet, and DenseNet on our dataset. The results demonstrate that our model achieved better performance with parameters reduced by 3 to 5 times and execution times faster by 8 to 23 times compared to the cascade structures when they performed the same tasks. Moreover, the proposed model with the VGG16 backbone has the highest effectiveness. Notably, compared to U-Net and some state-of-the-art segmentation models, the identification for the early-stage diseases has been impressively improved with mDice and mIoU metrics increasing by 7-25% and 6-23%, respectively. In addition, the segmentation performance for the infected region is also higher about by 2%. The classification on a complex background dataset reached precision, recall, F1-score, and accuracy values of 99.18%, 98.90%, 99.03%, and 98.93%, respectively, higher than the performance of some existing classification models. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.

关键词： Plant diseases

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

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

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International Symposium on Soft Computing and Intelligent systems (SCIS)

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

ISBN: (数字)9798350373332

ISBN: (纸本)9798350373349

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.

关键词： Location awareness Time-frequency analysis Estimation error Time difference of arrival Computer simulation Frequency estimation

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A Robust Higher-order Sliding Mode Controller Design for Underwater Vehicles in the Presence of Uncertainties

A Robust Higher-order Sliding Mode Controller Design for Und...

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International Conference on Control, Automation and systems ( ICCAS)

作者： Tegen Eyasu Derbew Nak Yong Ko Dept. of Electronic Engineering Interdisciplinary Program in IT-Bio Convergence System Chosun University Gwangju South Korea

ISBN: (数字)9788993215380

ISBN: (纸本)9798331517939

This paper presents trajectory following of a 6 degrees of freedom (DOFs) underwater vehicle using a robust generalized super-twisting algorithm (GSTA)-based sliding mode controller (SMC) (GSTA-SMC). A Lyapunov stability analysis framework was applied to verify the finite-time convergence of the system trajectories to the sliding manifold. Numerical simulations, both with and without the presence of external disturbances, were conducted using MATLAB/Simulink software. The tracking and chattering effect suppressing capabilities of the proposed controller were compared with the standard super-twisting algorithm (STA)-based sliding mode controller (STA-SMC). The simulation results demonstrated the effectiveness and the robustness of the proposed control method.

关键词： Uncertainty Software algorithms Numerical simulation Stability analysis Robustness 6-DOF Trajectory Underwater vehicles Numerical stability Standards

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

Localization Algorithms for Drones in a Wireless Communicati...

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International Conference on Control, Automation and systems ( ICCAS)

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

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.

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

Underwater Robot Navigation Through Compensation of Sensor M...

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International Conference on Control, Automation and systems ( ICCAS)

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

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.

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A Path Planning and Coordination Algorithm for Heterogeneous Tasks of Multi-UGV in Smart Farm: Work in Progress

A Path Planning and Coordination Algorithm for Heterogeneous...

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International Conference on Control, Automation and systems ( ICCAS)

作者： Yuseung Jo Hyoung Il Son Department of Convergence Biosystems Engineering Chonnam National University Gwangju Korea Interdisciplinary Program in IT-Bio Convergence System Chonnam National University Gwangju Korea

We propose a path planning and coordination algorithm for the heterogeneous tasks of multiple unmanned ground vehicles in a smart farm. The proposed algorithm considers the priorities of each of the tasks to maximize the productivity of smart farms. The algorithm can solve a scenario in which the robot operations are stopped unnecessarily. The proposed algorithm will be verified in a field evaluation. In this paper, we describe our experimental scenarios and list the performance metrics used in the field experiments. For evaluation, situations in which multiple UGVs are required to be coordinated in a smart farm were assumed as the experimental scenarios. The following performance metrics were used: (1) utilization rate, (2) success rate, (3) number of collisions, and (4) localization errors. The experimental results will be statistically analyzed. We hope that the analysis results will help determine whether the proposed path planning and coordination algorithm is effective when used in smart farms.

关键词： Smart agriculture Measurement Location awareness Productivity Statistical analysis Robot kinematics Path planning

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Wet tissue adhesive polymeric powder hydrogels for skeletal muscle regeneration

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bioactive Materials 2024年第10期40卷 334-344页

作者： Mingyu Lee Daun Seo Junggeon Park Sun Hong Lee Jin Jeon Woochan Kim Jangho Kim Hee Seok Yang Jae Young Lee School of Materials Science and Engineering Gwangju Institute of Science and TechnologyGwangju61005Republic of Korea Department of Nanobiomedical Science&BK21 FOUR NBM Global Research Center for Regenerative Medicine Dankook UniversityCheonan31116Republic of Korea Department of Convergence Biosystems Engineering Chonnam National UniversityGwangju61186Republic of Korea Department of Rural and Biosystems Engineering Chonnam National UniversityGwangjuRepublic of Korea Interdisciplinary Program in IT-Bio Convergence System Chonnam National UniversityGwangju61186Republic of Korea

Volumetric muscle loss(VML)frequently results from traumatic incidents and can lead to severe functional *** have been widely employed for VML tissue regeneration,which are unfortunately ineffective because of the lack of intimate contact with injured tissue for structural and mechanical *** hydrogels allow for strong tissue connections for wound ***,conventional adhesive hydrogels exhibit poor tissue adhesion in moist,bleeding wounds due to the hydration layer at the tissue–hydrogel interfaces,resulting in insufficient *** this study,we developed a novel,biocompatible,wet tissue adhesive powder hydrogel consisting of dextran-aldehyde(dex-ald)and gelatin for the regeneration of *** powder absorbs the interfacial tissue fluid and buffer solution on the tissue,spontaneously forms a hydrogel,and strongly adheres to the tissue via various molecular interactions,including the Schiff base *** particular,the powder composition with a 1:4 ratio of dex-ald to gelatin exhibited optimal characteristics with an appropriate gelation time(258 s),strong tissue adhesion(14.5 kPa),and ***-ald/gelatin powder hydrogels presented strong adhesion to various organs and excellent hemostasis compared to other wet hydrogels and fibrin glue.A mouse VML injury model revealed that the dex-ald/gelatin powder hydrogel significantly improved muscle regeneration,reduced fibrosis,enhanced vascularization,and decreased ***,our wet-adhesive powder hydrogel can serve as an effective platform for repairing various tissues,including the heart,muscle,and nerve tissues.

关键词： Powder Hydrogel Wet-adhesive Skeletal muscle regeneration

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Development of Streptomyces murinus JS029 as a potential biological control agent for soil-borne diseases

Development of Streptomyces murinus JS029 as a potential bio...

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2024年亚洲植物病理学大会

作者： Miju Jo Sunmin An Da Som Kim Mi jin Jeon Soonok Kim Won-Jae Chi Sook-Young Park Department of Plant Medicine Sunchon National University Interdisciplinary Program in IT-Bio Convergence System (BK21 plus) Sunchon National University

The genus Streptomyces is one of the primary sources of valuable compounds,such as anticancer and antibacterial ***,their application in controlling soil-borne fungal pathogens is *** this study,we screened 39 Streptomyces isolates against fungal phytopathogens,including 4 species of Sclerotinia,3 species of Rhizoctonia,Fusarium,and the bacterial pathogens Clavibacter michiganensis and Ralstonia solanacearum,using a dual-culture assay.

关键词： agent Development of Streptomyces murinus JS029 as a potential biological control agent for soil-borne diseases

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