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SSRN 2024年

作者： Jung, Jae Yong Park, Jin Young Yang, Hyun Kyoung Marine-Bionics convergence technology center Pukyong National University Busan48513 Korea Republic of Department of Electrical Electronics and Software Engineering Pukyong National University Busan48513 Korea Republic of

Crystalline monoclinic structure Gd2(WO4)3 phosphors, which can be utilized for anti-counterfeiting, fingerprint detection, and UV-LED color sheets, were prepared by calcining a co-precipitated precursor at 800 °C. The XRD patterns exhibited strong signals at the (-221) and (023) planes, with lattice parameter changes due to rare earth ion doping. The UV-vis absorption spectrum showed strong absorbance in the 200 – 350 nm range, with an estimated bandgap energy of approximately 4 eV. When excited at 276 nm, the synthesized phosphors emitted green, red, yellow, and reddish orange spectra, corresponding to the doped Tb3+, Eu3+, Dy3+, and Sm3+ ions, respectively. Utilizing these luminescent properties, flexible composite sheets were fabricated by mixing the phosphors with PDMS. When applied to UV-LED chips, these sheets emitted characteristic colors matching the emission spectra. The composites could be molded into various shapes such as letters, stars, hearts, and human figures. Under normal light, the composites appeared white, but under UV light, they displayed distinct colors, demonstrating their potential for anti-counterfeiting applications. Additionally, when the synthesized phosphor powder was sprinkled onto a glass substrate with fingerprints and illuminated with a UV lamp, the unique features of the fingerprints were clearly visible, indicating potential use in forensic fingerprint analysis. © 2024, The Authors. All rights reserved.

关键词： Phosphors

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Morphological Response of Storm Hinnamnor at Songjeong Beach Using UAV- Derived Data

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Journal of Coastal Research 2024年第SP1期116卷 126-130页

作者： Bo-Hyeon Hwang Ki-Deok Do Sung-Yeol Chang Department of Convergence Study on the Ocean Science and Technology Korea Maritime and Ocean University Busan Republic of Korea Department of Ocean Engineering Korea Maritime and Ocean University Busan Republic of Korea Haeyeon Engineering and Consultants Corporation Gangneung Republic of Korea

Hwang, B.-H.; Do, K.-D., and Chang, S.-Y., 2023. Morphological response of Storm Hinnamnor at Songjeong Beach using UAV-derived data. In: Lee, J.L.; Lee, H.; Min, B.I.; Chang, J.-I.; Cho, G.T.; Yoon, J.-S., and Lee, J. (eds.), Multidisciplinary Approaches to Coastal and marine Management. Journal of Coastal Research, Special Issue No. 116, pp. 126-130. Charlotte (North Carolina), ISSN *** study investigated the morphological response of a wave-dominated beach to large storms via field data collection. The field data were collected on Songjeong beach facing SE in the south-eastern corner of Korea. This study measured pre- and post-storm beach volumes by Storm Hinnamnor using Unmanned Aerial Vehicle (UAV). In this storm event, the peak of the significant wave was 10 m, and the wave period mainly varied between 10.9s under stormy conditions. The incident waves were mostly easterly at 90-115.5°. During this event, due to the strong storm intensity, the upper part of the sediment showed significant erosion along the entire beach, and net accumulation took place in the revetment area by overwash. The highest substantial loss occurred in the SW section of the study area, associated with the wave direction. Compared to the SW section, the mid and NE section of the study area eroded sediment. It was transported to the upper beach near the revetment area, suggesting that the onshore sediment transported was dominated in this area. After the storm, the local government undertook beach nourishment to restore the deposition sand on the revetment to the beach. This study carried out the UAV survey after beach nourishment and estimated the sediment volume by overwash. As a result, it was estimated that the amount of sand transported to the offshore area was 9533 m3, and the overwash deposition volume was 1441.3 m3. This study shows that UAV surveys can effectively estimate the morphological response of storm on the beach.

关键词： morphological response storm impact UAV application for coastal monitoring

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Ranging of Moving Sound Source Using Single Hydrophone in Shallow Waters

Ranging of Moving Sound Source Using Single Hydrophone in Sh...

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International Symposium on Underwater technology

作者： Jeong-Bin Jang Sung-Hoon Byun Gihoon Byun Korea University of Science and Technology-KRISO school Korea Research Institute of Ships and Ocean engineering(KRISO) Daejeon Korea Department of Convergence Study on the Ocean Science and Technology Korea Maritime and Ocean University Busan Korea

ISBN: (数字)9798331534189

ISBN: (纸本)9798331534196

This study proposes an algorithm to estimate the radial velocity of a moving sound source as well as the distance to the source using acoustic data recorded on a single hydrophone. The proposed algorithm is based on the field differencing technique which measures the radial velocity of the sound source by cross-correlating the sound fields at different source-receiver ranges and estimates the range to the source by matching the measured radial velocity profile with the radial velocity model hypothesized by the range. Because the proposed algorithm considers the Doppler shift incurred by the source movement, it allows correct selection of the signal of interest and robust calculation of the cross-correlated field. The proposed algorithm is verified using the SWellEx-96 experiment data, and the data analysis results show that the proposed algorithm estimates the source track parameters at longer distances than the original form of the field differencing method.

关键词： Doppler shift Location awareness Tracking Sonar Acoustic measurements Velocity measurement Underwater technology Water resources Hydrophones Narrowband

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Deciphering the toxic effects of polystyrene nanoparticles on erythropoiesis at single-cell resolution

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Zoological Research 2025年第1期46卷 165-176页

作者： Eun Jung Kwon Hyeon Mi Sung Hansong Lee Soyul Ahn Yejin Kim Chae Rin Lee Kihun Kim Kyungjae Myung Won Kyu Kim Dokyoung Kim Sanghwa Jeong Chang-Kyu Oh Yun Hak Kim Medical Research Institute Pusan National UniversityYangsanGyeongsangnam-do 50612Republic of Korea Institute for Future Earth Pusan National UniversityBusan 46241Republic of Korea Department of Convergence Medical Sciences School of MedicinePusan National UniversityYangsanGyeongsangnam-do 50612Republic of Korea Department of Biomedical Informatics School of MedicinePusan National UniversityYangsanGyeongsangnam-do 50612Republic of Korea Department of Anatomy School of MedicinePusan National UniversityYangsanGyeongsangnam-do 50612Republic of Korea Center for Genomic Integrity Institute for Basic ScienceUlsan 689-798Republic of Korea Department of Biomedical Engineering College of Information-Bio Convergence EngineeringUlsan National Institute of Science and TechnologyUlsan 44919Republic of Korea Natural Product Research Center Korea Institute of Science and Technology(KIST)GangneungGangwon-do 25451Republic of Korea Department of Convergence Medicine Yonsei University Wonju College of MedicineWonjuGangwon-do 26426Republic of Korea Natural Product Applied Science KIST SchoolUniversity of Science and Technology(UST)GangneungGangwon-do 25451Republic of Korea Department of Biomedical Science Graduate SchoolKyung Hee UniversitySeoul 02447Republic of Korea Department of Anatomy and Neurobiology College of MedicineKyung Hee UniversitySeoul 02447Republic of Korea Department of Precision Medicine Graduate SchoolKyung Hee UniversitySeoul 02447Republic of Korea Center for Converging Humanities Kyung Hee UniversitySeoul 02447Republic of Korea KHU-KIST Department of Converging Science and Technology Kyung Hee UniversitySeoul 02447Republic of Korea UC San Diego Materials Research Science and Engineering Center 9500 Gilman DriveLa JollaCalifornia 92093USA Medical Research Center for Bioreaction to Reactive Oxygen Species and Biomedical Science Institute Core Research Institute(CRI)Kyung Hee UniversitySeoul 02447Republic of Korea Center for Brain Technology Brain Science Institute

Polystyrene nanoparticles pose significant toxicological risks to aquatic ecosystems,yet their impact on zebrafish(Danio rerio)embryonic development,particularly erythropoiesis,remains *** study used single-cell RNA sequencing to comprehensively evaluate the effects of polystyrene nanoparticle exposure on erythropoiesis in zebrafish *** vivo validation experiments corroborated the transcriptomic findings,revealing that polystyrene nanoparticle exposure disrupted erythrocyte differentiation,as evidenced by the decrease in mature erythrocytes and concomitant increase in immature ***,impaired heme synthesis further contributed to the diminished erythrocyte *** findings underscore the toxic effects of polystyrene nanoparticles on hematopoietic processes,highlighting their potential to compromise organismal health in aquatic environments.

关键词： Polystyrene nanoparticles Zebrafish embryos Single-cell RNA sequencing Erythropoiesis

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Indian monsoon variability in the Mahanadi Basin over the last two glacial cycles and its implications on the Indonesian throughflow

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Geoscience Frontiers 2023年第1期14卷 215-229页

作者： Jongmin Lee Sunghan Kim Minoru Ikehara Keiji Horikawa Yoshihiro Asahara Chan Min Yoo Boo-Keun Khim Department of Oceanography Pusan National UniversityBusan 46241South Korea Deep-sea Mineral Resources Research Center Korea Institute of Ocean Science&TechnologyBusan 49111South Korea Division of Glacial Environment Research Korea Polar Research InstituteIncheon 21990South Korea Center for Advanced Marine Research Kochi UniversityKochi 783-8502Japan Graduate School of Science and Engineering for Research University of ToyamaToyama 930-8555Japan Department of Earth and Planetary Sciences Nagoya UniversityNagoya 464-8601Japan

The orbital-scale variability of the Indian summer monsoon(ISM)has been influenced by multiple factors,such as atmospheric CO_(2)concentration,global ice volume,and *** for weathering activity and paleo-productivity provide potential insights into the driving forces of its *** documented multi-proxy data at IODP Site U1445,located in the Mahanadi Basin of the northwestern Bay of Bengal,to find out ISM variability over the last 200 *** proxy records,such as Nd/Sr isotopes of detrital particles,clay mineral compositions of the fine-grained sediments,biogenic opal and CaCO_(3),organic carbon contents,and carbon isotopes of organic matter,represent sediment sources,weathering patterns,and paleo-productivity related to the ISM *** Nd/Sr isotope data and clay mineral compositions suggest that the sediments at Site U1445 originated mainly from the Ganges,Brahmaputra,and Meghna rivers without dramatic provenance change between the glacial and interglacial *** weathering activity inferred from clay mineral compositions and the paleo-productivity shift reconstructed by biogenic opal and CaCO_(3)contents suggest that the land-sea interactions were closely linked to the ISM precipitation between the glacial and interglacial *** precipitation by the strong ISM resulted in intense chemical weathering and dominant biogenic opal deposition during the interglacial *** contrast,low precipitation by the weak ISM led to reduced chemical weathering and predominant CaCO_(3)deposition during the glacial ***,the ISM variability driving the land-sea interactions in the Mahanadi Basin was modulated by the Indonesian throughflow(ITF).Our study emphasizes the role of low-latitude forcing of climatic changes in the strong relationship between the ISM and ITF over orbital periods,providing a base for future investigations.

关键词： Provenance Weathering activity Paleo-productivity Indian summer monsoon Bay of Bengal Indonesian throughflow

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Prototype Model of marine Pollution Monitoring Using Multiple Remote Sensing Platforms

Prototype Model of Marine Pollution Monitoring Using Multipl...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Chan-Su Yang Dae-Woon Shin Marine Security and Safety Research Center Korea Institute of Ocean Science & Technology Busan Korea Department of Convergence Study on the Ocean Science and Technology Ocean Science and Technology School Korea Maritime & Ocean University Busan Korea Applied Ocean Sciences University of Science & Technology Daejeon Korea

Various platforms, such as satellites, manned aircraft, Unmanned Aerial Vehicle (UAV), and mobile devices, can be used to obtain remotely sensed data in the form of images or videos. In this study, we present a prototype model that utilizes multiple remote sensing data for monitoring marine pollution. Our aim is to generate and visualize marine pollution information, which would facilitate swift and precise responses to marine pollution incidents. The automatic production and sharing of marine Pollution Information (MPI) are crucial steps in effectively addressing on-site oil spills. Of many marine pollutants, oil spills and some floating Hazardous & Noxious Substances (HNS) are the subjects of the work.

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Oil Spill Detection Technique with Automatic Updating Using Deep Learning and Oil Spill Index

Oil Spill Detection Technique with Automatic Updating Using ...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Dae-Woon Shin Chan-Su Yang Won-Jun Choi Marine Security and Safety Research Center Korea Institute of Ocean Science & Technology Busan Korea Department of Convergence Study on the Ocean Science and Technology Ocean Science and Technology School Korea Maritime & Ocean University Busan Korea Applied Ocean Sciences University of Science & Technology Daejeon Korea

This paper presents a novel approach for detecting oil spills, employing two distinct methods. The first method involves utilizing an Oil Spill Index (OSI) that analyzes spectral band information, while the second method utilizes a Deep Learning (DL) segmentation model. The outcomes of both methods are then combined to generate training data, and this iterative process is repeated to update the oil spill DL model. The training data used in this approach are obtained from multiple remote sensing platforms including optical and SAR satellite imagery. By employing this proposed method, it is anticipated that high-quality and comprehensive training datasets will be generated, enabling the DL model to perform effectively.

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Computational fluid dynamics-based structure optimization of ultra-high-pressure water-jet nozzle using approximation method

arXiv

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arXiv 2025年

作者： Chen, Yuan-Jie Zhou, Ting Institute of Ocean Engineering and Technology Ocean College Zhejiang University Zhoushan31602 China Department of Convergence Study on the Ocean Science and Technology Korea Maritime and Ocean University Busan49112 Korea Republic of

Since the geometry structure of ultra-high-pressure (UHP) water-jet nozzle is a critical factor to enhance its hydrodynamic performance, it is critical to obtain a suitable geometry for a UHP water jet nozzle. In this study, a CFD-based optimization loop for UHP nozzle structure has been developed by integrating an approximate model to optimize nozzle structure for increasing the radial peak wall shear stress. In order to improve the optimization accuracy of the sparrow search algorithm (SSA), an enhanced version called the Logistic-Tent chaotic sparrow search algorithm (LTC-SSA) is proposed. The LTC-SSA algorithm utilizes the Logistic-Tent Chaotic (LTC) map, which is designed by combining the Logistic and Tent maps. This new approach aims to overcome the shortcoming of 'premature convergence' for the SSA algorithm by increasing the diversity of the sparrow population. In addition, to improve the prediction accuracy of peak wall shear stress, a data prediction method based on LTC-SSA-support vector machine (SVM) is proposed. Herein, LTC-SSA algorithm is used to train the penalty coefficient C and parameter gamma g of SVM model. In order to build LTC-SSA-SVM model, optimal Latin hypercube design (Opt LHD) is used to design the sampling nozzle structures, and the peak wall shear stress (objective function) of these nozzle structures are calculated by CFD method. For the purpose of this article, this optimization framework has been employed to optimize original nozzle structure. The results show that the optimization framework developed in this study can be used to optimize nozzle structure with significantly improved its hydrodynamic performance. Copyright © 2025, The Authors. All rights reserved.

关键词： Shear stress

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The Long-Term Impact of Bauxite Residue (Red Mud) Ocean Dumping on the Benthic Environment in South Korea

SSRN

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SSRN 2023年

作者： Kim, Chang-Joon Chung, Chang-Soo Jung, Jun-Mo Kang, Dong-Won Kim, Young-Ryun Kim, Hye-Eun Shin, Kyung-Hoon Choia, Ki-Young Marine Environment Research Department Korea Institute of Ocean Science & Technology Busan49111 Korea Republic of Marine Eco-Technology Institute Busan48520 Korea Republic of Busan49111 Korea Republic of Department of Marine Science and Convergence Engineering Hanyang University ERICA Ansan15588 Korea Republic of Major of Oceanography Division of Earth Environmental System Science Pukyong National University Busan48513 Korea Republic of

Between 1999–2009, 344,000 m3 of dry bauxite residue (red mud) was discharged into the red mud dumping zone in the East Sea-Byeong ocean dumping site in South Korea. Several studies have shown red mud dumping effects as a diluted slurry through pipelines, however, few investigated the dry-caked red mud impact deposited via intensive discharge methods. We collected core sediment samples at red mud dumping and reference, followed by a Cr geochemical characteristics investigation, and evaluated benthic communities to understand the impact before and after the 2010 red mud dumping ban. Heavy metal concentrations and macrobenthic community analysis revealed that red mud traces were still visible on the study station surface in 2019. The highest Cr content exceeded the effect range median standard. Geochemical fraction indicated high non-residual fraction ratios, considered anthropogenic input. We confirmed that Thyasira tokunagai, an opportunistic and contamination-stress-resistant species, predominated in the study location. © 2023, The Authors. All rights reserved.

关键词： Ocean dumping

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Spatial and vertical distribution of per- and polyfluoroalkyl substances (PFASs) in the water columns of the regional seas of South Korea

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Chemosphere 2025年 370卷 144042页

作者： Yang, Sunmi Gwak, Jiyun Kim, Mungi Cha, Jihyun Kim, Youngnam Lee, Yeonjung Moon, Hyo-Bang Hong, Seongjin Department of Earth Environmental & Space Sciences Chungnam National University Daejeon34134 Korea Republic of Ocean Climate Response & Ecosystem Research Department Korea Institute of Ocean Science and Technology Busan49111 Korea Republic of Department of Marine Science and Convergence Engineering Hanyang University Ansan15588 Korea Republic of

This study focused on analyzing the spatial and vertical distributions of 28 per- and polyfluoroalkyl substances (PFASs), which comprised five precursors and three alternatives, in the water columns of the regional seas surrounding South Korea, such as the Yellow Sea (YS, Y1–Y10), East China Sea (ECS, EC1–EC6), South Sea (SS, S1–S5), and East Sea (ES, E1–E7). The concentrations of these PFASs detected in 204 seawater samples varied from below the limit of detection (−1 in the YS, 0.26–17 ng L−1 in the ECS, 0.08–3.4 ng L−1 in the SS, and −1 in the ES, with perfluorooctanoic acid being identified as the most abundant compound. Principal component analysis grouped water masses and regions based on PFASs concentrations and compositions, enabling the identification of PFASs sources and their fate. PFASs are mainly derived from land and are transported via ocean currents, where their compositions tend to remain conservative. PFASs entering the YS are likely conveyed to the ES through ECS and SS, following the northward movement of the Taiwan Warm Current and Kuroshio Current. The ECS serves as a mixing zone for PFASs from various sources. This study provides valuable baseline data for understanding PFASs transport and the characteristics of water masses in the regional seas around South Korea. © 2024 Elsevier Ltd

关键词： Ocean currents

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