• Article

    GPU-Accelerated Optimal Interpolation for Global Ocean Surface pCO2 Mapping
    Gyundo Pak
    GPU acceleration has become essential for meeting the rising computational demands of high-resolution ocean modeling and data assimilation. In this study, a … + READ MORE
    GPU acceleration has become essential for meeting the rising computational demands of high-resolution ocean modeling and data assimilation. In this study, a GPU-accelerated, chunk-based, sequential Optimal Interpolation (OI) scheme was developed to reconstruct global ocean surface partial pressure of CO2 (pCO2) fields. OI analyses were successfully performed for the period between 1990 and 2019 using 30 years of monthly background fields and observations. Benchmarking highlighted substantial gains, with runtimes up to 35 times faster than that of a single-core CPU baseline and approximately 12 times faster than that of multi-core CPU runs. The GPU performance improved steadily with increasing chunk size, whereas the fastest runtimes were consistent with observation batch sizes in the range of 1,000–2,000. Sequential OI generated analysis fields nearly identical to those from the all-at-once observation update, and its runtime ranged from a bit slower to slightly faster depending on the choice of observation batch size. These results show that GPU-based OI is both practical and efficient, offering a pathway for the direct application of GPUs in operational ocean prediction systems. - COLLAPSE
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    14 January 2026

  • Article

    Study on Performance Improvement of a Flapping-foil Hydrokinetic Turbine of Parallel Configuration

    진동익 유체동력 터빈의 병렬 배치에 따른 성능 향상 연구

    Sang Chul Lee, Dasom Jeong, Jin Hwan Ko

    이상철, 정다솜, 고진환

    In this study, we performed 2D simulations with varying separation distances to determine the influence of ground effect on the efficiency of … + READ MORE
    In this study, we performed 2D simulations with varying separation distances to determine the influence of ground effect on the efficiency of parallel-configured flapping-foil hydrokinetic turbine. The efficiency was highest at 38.38% in the case of the closest distance (d/c = 2.0), which was 2.32% higher than the case of the farthest distance (d/c = 4.0) and 10.49% higher than the case of a single turbine. In all cases, lift contributed the most to the power, at over 80%, and moment contributed mainly in the phase where the direction of heave motion changed. The increase in efficiency due to ground effect occurs mainly in the leaving phase, and the pressure increase on the lower surface due to the blockage effect and the pressure decrease due to the leading edge vortex on the upper surface were the main causes in the early and later stages, respectively. - COLLAPSE
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    15 January 2026

  • Article

    Climate-driven Future Changes in Habitat Distribution of Jack Mackerel (Trachurus japonicus) in Korean Waters

    기후변화에 따른 한반도 주변해 전갱이(Trachurus japonicus)서식지 분포 변화 전망

    Minkyoung Bang

    방민경

    Jack mackerel (Trachurus japonicus), a commercially important pelagic species in Korea, is highly sensitive to environmental variability. Despite its ecological … + READ MORE
    Jack mackerel (Trachurus japonicus), a commercially important pelagic species in Korea, is highly sensitive to environmental variability. Despite its ecological and fisheries importance, the future changes in its habitat distribution in response to climate change remain poorly understood. In this study, we examined projected changes in the habitat distribution of jack mackerel in Korean waters in the 2050s using species distribution models. The projected habitat suitability exhibited clear regional differences. Specifically, while suitability is projected to increase in the Yellow and East Seas, it is expected to decline along the southern coast—a primary habitat for jack mackerel. This decline is attributed to the fact that water temperatures in the northern East China Sea are predicted to exceed the optimal thermal range for jack mackerel. These findings suggest that climate change could lead to a contraction of major habitats and a spatial redistribution of suitable areas for jack mackerel, highlighting the need for continuous monitoring and adaptive management strategies. - COLLAPSE
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    13 February 2026
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