Kyounghoon Lee
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View article: Comparative Economic Analysis of Rainbow Trout Aquaculture Systems Considering Greenhouse Gas Emissions
Comparative Economic Analysis of Rainbow Trout Aquaculture Systems Considering Greenhouse Gas Emissions Open
Global warming, driven by greenhouse gas (GHG) emissions, is accelerating globally and highlights the need for effective mitigation strategies. This study assesses the economic feasibility of rainbow trout aquaculture by incorporating GHG …
View article: Analysis of Fishery Resource Distribution and Seasonal Variations in the East China Sea: Utilizing Trawl Surveys, Environmental DNA, and Scientific Echo Sounders
Analysis of Fishery Resource Distribution and Seasonal Variations in the East China Sea: Utilizing Trawl Surveys, Environmental DNA, and Scientific Echo Sounders Open
Assessing fishery resources is crucial for sustainable marine ecosystem management and the operation of fisheries. This study integrates trawl surveys, environmental DNA (eDNA) analysis, and scientific echo sounder techniques to analyze th…
View article: Acoustic Data Analysis for Density Estimation of Antarctic Krill (Euphausia superba) Resources Around South Shetland Islands
Acoustic Data Analysis for Density Estimation of Antarctic Krill (Euphausia superba) Resources Around South Shetland Islands Open
This study estimated the density distribution of Antarctic krill inhabiting an area near the South Shetland Islands using two acoustic analysis methods recommended by the Commission for the Conservation of Antarctic Marine Living Resources…
View article: Density estimates of fishery resources in the Yedang Reservoir using hydroacoustics
Density estimates of fishery resources in the Yedang Reservoir using hydroacoustics Open
This study purpose to identify the spatiotemporal density distribution of dominant species of invasive fishes in the inland ecosystem of Yedang reservoir using scientific echosounder in June and September. In survey area (A) where fishing …
View article: Species Identification and Frequency Characteristic of Japanese Anchovy (Engraulis japonicus) Using Hydro-Acoustics
Species Identification and Frequency Characteristic of Japanese Anchovy (Engraulis japonicus) Using Hydro-Acoustics Open
In this study, the KRM (Kirchhoff-ray mode) model was used to identify the acoustic scattering characteristics of anchovies according to frequency, and the school detection method and dB-difference method were used to identify the acoustic…
View article: Ex Situ Target Strength Measurements of Rockfish (Sebastes schlegeli) and Striped Beakperch (Oplegnathus fasciatus)
Ex Situ Target Strength Measurements of Rockfish (Sebastes schlegeli) and Striped Beakperch (Oplegnathus fasciatus) Open
The rockfish (Sebastes schlegeli) and striped beakperch (Oplegnathus fasciatus) were released in marine ranching areas in Korea, Japan, and China to maintain fishery resources in coastal areas. To estimate the density and biomass of fisher…
View article: A Three–Year Comparison of Fluctuations in the Occurrence of the Giant Jellyfish (Nemopilema nomurai)
A Three–Year Comparison of Fluctuations in the Occurrence of the Giant Jellyfish (Nemopilema nomurai) Open
In this study, acoustic, sighting, trawl, and marine environmental surveys were used to determine the vertical distribution and density of giant jellyfish that have been observed in Korean waters over the past 3 years. From 2020 to 2022, a…
View article: A study on the multi-frequency acoustic target strength of krill using a stochastic distorted-wave born approximation (SDWBA) model
A study on the multi-frequency acoustic target strength of krill using a stochastic distorted-wave born approximation (SDWBA) model Open
We examined the dB difference in target strength at multiple frequencies (ΔTS) for the identification of Antarctic krill (Euphausia superba) and ice krill (Euphausia crystallorophias) using a stochastic distorted-wave Born approximation mo…
View article: Erratum: Path Prediction for Fishing Boats Using Attention-Based Bidirectional Gated Recurrent Unit
Erratum: Path Prediction for Fishing Boats Using Attention-Based Bidirectional Gated Recurrent Unit Open
View article: Enhancing Chub Mackerel Catch Per Unit Effort (CPUE) Standardization through High-Resolution Analysis of Korean Large Purse Seine Catch and Effort Using AIS Data
Enhancing Chub Mackerel Catch Per Unit Effort (CPUE) Standardization through High-Resolution Analysis of Korean Large Purse Seine Catch and Effort Using AIS Data Open
Accurate determination of fishing effort from Automatic Identification System (AIS) data improves catch per unit effort (CPUE) estimation and precise spatial management. By combining AIS data with catch information, a weighted distribution…
View article: Spatiotemporal Distribution of Antarctic Silverfish in the Ross Sea, Antarctica
Spatiotemporal Distribution of Antarctic Silverfish in the Ross Sea, Antarctica Open
Antarctic silverfish (Pleuragramma antarcticum) play a crucial intermediary role in connecting top predators and krill in the food web of the Antarctic Ocean. Despite their crucial role, research on their abundance is lacking. In this stud…
View article: Swimming behavior analysis of small box jellyfish (Carybdea brevipedalia)
Swimming behavior analysis of small box jellyfish (Carybdea brevipedalia) Open
In this study, the swimming behavior of a small box jellyfish (Carybdea brevipedalia), which consists of inhaling external seawater and expelling it through its mouth to generate forward thrust, was characterized using particle image veloc…
View article: Density estimation of euphausiids and copepods by using a multi-frequency method
Density estimation of euphausiids and copepods by using a multi-frequency method Open
This study used a multi-frequency acoustic method to assess the density and spatial distribution of dominant zooplankton, euphausiids and copepods, which are representative species of the zooplankton immigrating the sea around Republic of …
View article: Enhancing Sustainability through Analysis and Prevention: A Study of Fatal Accidents on Trap Boats within the Commercial Fishing Industry
Enhancing Sustainability through Analysis and Prevention: A Study of Fatal Accidents on Trap Boats within the Commercial Fishing Industry Open
The global commercial fishing industry, which employs approximately 159,800 seafarers worldwide (as reported by the Food and Agriculture Organization of the United Nations), faces a significant challenge in terms of safety. According to es…
View article: Species Identification and Tempo-Spatial Distribution of Anchovy Using Multi-Frequency
Species Identification and Tempo-Spatial Distribution of Anchovy Using Multi-Frequency Open
In this study, we identified the echo signals of anchovies on echograms using the dB-difference method; additionally, the daytime and nighttime distribution characteristics of anchovies were determined. Using the difference in frequency ch…
View article: Development of an Edge Computing-Based Intelligent Feeding System for Observing Depth-Specific Feeding Behavior in Red Seabream
Development of an Edge Computing-Based Intelligent Feeding System for Observing Depth-Specific Feeding Behavior in Red Seabream Open
The supply of feed has a significant effect on fish growth and operation costs, making it a critical factor in aquaculture. Owing to the repetitive nature of feed supply, feeding techniques have undergone a shift from manual feeding to sys…
View article: Development of an Edge-Computing-Based Intelligent Feeding System for Observing Depth-Specific Feeding Behavior in Red Seabream
Development of an Edge-Computing-Based Intelligent Feeding System for Observing Depth-Specific Feeding Behavior in Red Seabream Open
The supply of feed has a significant effect on fish growth and operation costs, making it a critical factor in aquaculture. Owing to the repetitive nature of feed supply, feeding techniques have undergone a shift from manual feeding to sys…
View article: Spatio-Temporal Distribution of Giant Jellyfish (Nemopilema nomurai)
Spatio-Temporal Distribution of Giant Jellyfish (Nemopilema nomurai) Open
In this study, the distribution of giant N. jellyfish by the echo counting method was investigated in the East China Sea, where giant N. jellyfish are known to breed and migrate to the coastal waters of Korea mainly in summer. In addition,…
View article: Spatial–Temporal Distribution of the Euphausiid Euphausia pacifica and Fish Schools in the Coastal Southwestern East Sea
Spatial–Temporal Distribution of the Euphausiid Euphausia pacifica and Fish Schools in the Coastal Southwestern East Sea Open
The spatial and temporal distribution of euphausiid krill Euphausia pacifica (Crustacea: Malacostraca) and of fish schools were observed along acoustic transects at the southwestern East Sea coastline of Korea. Two-frequency (38- and 120-k…
View article: Corrigenda to: Standing stock of Antarctic krill (<i>Euphausia superba</i> Dana, 1850) (Euphausiacea) in the Southwest Atlantic sector of the Southern Ocean, 2018–19
Corrigenda to: Standing stock of Antarctic krill (<i>Euphausia superba</i> Dana, 1850) (Euphausiacea) in the Southwest Atlantic sector of the Southern Ocean, 2018–19 Open
View article: Comparison of Target Strength of Pacific Herring (Clupea pallasii Valenciennes, 1847) from Ex-Situ Measurements and a Theoretical Model
Comparison of Target Strength of Pacific Herring (Clupea pallasii Valenciennes, 1847) from Ex-Situ Measurements and a Theoretical Model Open
Pacific herring (Clupea pallasii Valenciennes, 1847) is a commercially important species that inhabits the coastal waters of the North Pacific from Korea to California, USA. This study analyzed the target strength (TS; dB re 1 m2) of Pacif…
View article: (−)-Loliolide Isolated from Sargassum horneri Abate UVB-Induced Oxidative Damage in Human Dermal Fibroblasts and Subside ECM Degradation
(−)-Loliolide Isolated from Sargassum horneri Abate UVB-Induced Oxidative Damage in Human Dermal Fibroblasts and Subside ECM Degradation Open
Ultraviolet (UV) B exposure is a prominent cause of skin aging and a contemporary subject of interest. The effects are progressing through the generation of reactive oxygen species (ROS) that alter cell signaling pathways related to inflam…
View article: A Study on the Characteristics of Fishery Resources Distribution in Coastal Waters of Yeongil Bay Using Acoustic Survey
A Study on the Characteristics of Fishery Resources Distribution in Coastal Waters of Yeongil Bay Using Acoustic Survey Open
In this study, the identification of dominant fish species in the East Sea was conducted using the dB-difference method. The survey was conducted using the two frequencies of 38 and 120 kHz in transect 6 of the southern part of the East Se…
View article: The Anti-Oxidative and Anti-Neuroinflammatory Effects of Sargassum horneri by Heme Oxygenase-1 Induction in BV2 and HT22 Cells
The Anti-Oxidative and Anti-Neuroinflammatory Effects of Sargassum horneri by Heme Oxygenase-1 Induction in BV2 and HT22 Cells Open
Sargassum horneri is used as a traditional medicinal agent and exhibits various pharmacological effects. In this study, we found that the 70% EtOH extract contained 34.37 ± 0.75 μg/mg fucosterol. We tested the antioxidant activities of the…
View article: UVB protective effects of Sargassum horneri through the regulation of Nrf2 mediated antioxidant mechanism
UVB protective effects of Sargassum horneri through the regulation of Nrf2 mediated antioxidant mechanism Open
View article: Small-Scale Spatiotemporal Pattern in the Spawning of Pacific Herring (Clupea pallasii) in the Jinhae Bay, Korea, Estimated Using Hydroacoustic Survey
Small-Scale Spatiotemporal Pattern in the Spawning of Pacific Herring (Clupea pallasii) in the Jinhae Bay, Korea, Estimated Using Hydroacoustic Survey Open
Acoustic surveys were used to locate coastal Pacific herring (Clupea pallasii) spawning grounds, and the spatial and temporal patterns of their spawning in Jinhae Bay, Korea were examined. We deployed mooring with a newly designed autonomo…
View article: OUP accepted manuscript
OUP accepted manuscript Open
Estimates of the distribution and density of Antarctic krill (Euphausia superba Dana, 1850) were derived from a large-scale survey conducted during the austral summer in the Southwest Atlantic sector of the Southern Ocean and across the Sc…
View article: Comparison of Distribution and Density of Nemopilema nomurai by Water Columns Using Echo Counting and Echo Integration Methods
Comparison of Distribution and Density of Nemopilema nomurai by Water Columns Using Echo Counting and Echo Integration Methods Open
In this study, the distribution of Nemopilema nomurai in the waters of Mijo-myeon, Namhae and Gijang-gun, Busan was analyzed; furthermore, echo counting and echo integration methods were used to compare the distribution density. The acoust…
View article: Density Estimation of Antarctic Krill in the South Shetland Island (Subarea 48.1) Using dB-Difference Method
Density Estimation of Antarctic Krill in the South Shetland Island (Subarea 48.1) Using dB-Difference Method Open
This study is aimed to estimate the density of Antarctic krill that inhabit in the area around South Shetland Island by using a dB-difference method. An acoustic survey was conducted from 13 to 24 April in 2016 in the sea of South Shetland…
View article: Human Keratinocyte UVB-Protective Effects of a Low Molecular Weight Fucoidan from Sargassum horneri Purified by Step Gradient Ethanol Precipitation
Human Keratinocyte UVB-Protective Effects of a Low Molecular Weight Fucoidan from Sargassum horneri Purified by Step Gradient Ethanol Precipitation Open
Ultraviolet B (UVB) radiation-induced oxidative skin cell damage is a major cause of photoaging. In the present study, a low molecular weight fucoidan fraction (SHC4) was obtained from Sargassum horneri by Celluclast-assisted extraction, f…