18,652 results
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Journal Article
Numerical study on the influence of localized damage effect of explosives on steel plate structure damage under underwater contact explosions
This study investigates the fluid-structure interaction dynamics induced by underwater explosive, focusing on the impact of localized damage effects of explosive on the transient interaction between plate structures. To accurately characterize this localized effect, numerical experiments were…
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Journal Article
Modelling maritime GHG emission measures impact assessment: A case study for container shipping by system dynamics
The shipping industry is responsible for around 2% of carbon dioxide (CO₂) emissions worldwide. This research explores the interaction of technology change, operational approaches, and policy measures in achieving the target for reducing greenhouse gas (GHG) emissions. A simulation model based on…
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Journal Article
Robust trajectory tracking of surface vessels in ice floe sea state via discrete integral sliding-mode control and Gaussian process regression
By considering the disturbance caused by ice floes in polar regions, the trajectory tracking control problem for uncertain unmanned surface vessels (USVs) is investigated in this paper. USVs for trajectory tracking missions in polar regions are required to not only overcome common disturbances and…
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Journal Article
Research on deep learning-based network intrusion detection methods for smart ships
As the development of intelligent ships rapidly progresses, the importance of maritime network security escalates. Intrusion Detection Systems (IDS) serve as a pivotal defense mechanism against cyberattacks targeting these vessels. To augment the efficacy of IDS in detecting anomalous network…
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Journal Article
Development of collision-case-based testing scenarios for validating autonomous ship collision-avoidance algorithms
The criticality of collision-avoidance technology for ensuring safe navigation of autonomous ships necessitates diverse testing scenarios that reflect complex maritime environments. However, previous testing scenarios, often based on virtual trajectories or simplified encounters, have shown…
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Journal Article
A negotiation method for cooperative collision avoidance between ships in mixed navigation scenarios: model construction, strategy driving, and unilateral learning
With the gradual development of Maritime Autonomous Surface Ships (MASS), sea traffic is expected to remain in mixed navigation scenarios where autonomous and conventional ships operate concurrently. General collision avoidance methods and autonomous algorithms resolve encounter situations…
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Journal Article
A PointPillars-based 3D point cloud object detector of USVs for small target detection in dynamic aquatic environments
LiDAR, a crucial sensor for Unmanned Surface Vehicles (USVs), allows for precise 3D modelling but encounters challenges in real-time target detection due to sparse point clouds. Current 3D point cloud detectors struggle to effectively capture fine-grained details and dynamic water surface features…
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Journal Article
Design of an adaptive PI speed controller for FOC-driven underwater thrusters
Underwater thrusters are the primary actuators in marine vehicles. The thruster drive and control methods for these thrusters considerably influence their dynamic response, accuracy, and efficiency. This study reviewed the structure of field-oriented control (FOC) and six-step commutation…
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Journal Article
A data-driven framework for attainable ship speed uncertainty under stochastic weather conditions
This paper presents a data-driven framework for quantifying attainable ship speed uncertainty considering weather forecast uncertainty. The methodology integrates two parallel workflows: weather forecast processing and ship performance simulation. Weather forecast data from NOAA and GFS sources are…
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Journal Article
Numerical and experimental study of the seakeeping performance for a novel fish farming vessel considering nets
To improve the economic feasibility of offshore aquaculture, this study proposes a novel concept of fish farming vessel which is retrofitted by an old bulk carrier. Large open farming tanks has been created by replacing the side hull plates with rigid metal nets and retaining the transverse…
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Journal Article
Determination of the safety exclusion zone for battery-powered ship with consideration of fire accident
Battery-powered ships have been developed quickly owing to the international dual carbon strategy and net-zero initiatives. However, the safety of battery-powered ships has attracted much attention because of the high frequency of fire accidents, and maintaining a safety distance between a…
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Journal Article
Numerical investigation of the hydrodynamic characteristics and interactions of an unmanned surface vehicle chasing a mother ship during recovery
Unmanned surface vehicles (USVs) require efficient and reliable recovery at sea. However, the recovery process, involving USVs chasing a mother ship, is complex and risky due to wave-making and wake effects that impact USV stability and resistance. It is necessary to study the interaction between…
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Journal Article
Performance enhancement of Savonius hydrokinetic turbines: the role of twisted blade profiles
Savonius Hydrokinetic Turbines (SHTs) are widely recognized for their simplicity, cost-effectiveness, and adaptability to slow flow conditions. However, conventional SHT designs face limitations, including low efficiency and significant torque fluctuations. The adoption of twisted/helical blade…
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Journal Article
Improving anchorage occupancy forecasting with stacked ensemble learning
Anchorage areas are essential for safe and efficient maritime operations. However, conventional forecasting models often underperform in dynamic port conditions, as they rely heavily on historical averages and static assumptions. To address these limitations, this study proposes a forecasting…
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Journal Article
Hydrodynamic interactions in midwater trawl nets: combined effects of flow velocity and door spreading through numerical and experimental approaches
Owing to escalating fuel costs and dwindling fish stocks, optimising midwater trawl efficiency requires a thorough investigation of net design variables. To understand the morphological changes in a trawl net under different operating conditions, a numerical model of the trawl was established using…
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Journal Article
Marine engine cylinder exhaust temperature prediction based on PSO-optimized CNN-LSTM-attention network
Marine diesel engines play a critical role in ensuring vessel safety and stable operation. Among their operating parameters, cylinder exhaust gas temperature is a key indicator of an engine’s thermal performance and overall health. Accurate forecasting of this parameter is therefore essential for…
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Journal Article
Challenges Faced by Teachers in Preschool Special Education
The aim of this research is to examine the difficulties faced by teachers working in preschool special education practices using a qualitative approach. The study was conducted using a phenomenological research design. The study group consisted of 18 preschool teachers (14 female, 4 male) working…
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Journal Article Full text
Evaluating the Effectiveness of the C-EcoForHome Composter for Indoor Biowaste Processing in Educational Institutions
Indoor biowaste treatment using small-scale composters has proven effective for processing organic waste and recovering valuable resources. This study evaluated the performance of the handmade C-EcoForHome composter, supplemented with an inoculant, in processing biowaste generated at five…
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Journal Article Full text
Mehaničko recikliranje poliamidne niti za košnju: rješenje ili gubitak vremena?
U ovom radu provedeno je mehaničko recikliranje niti za košnju u laboratorijskom dvopužnom ekstruderu. Procijenjen je utjecaj mehaničkog recikliranja na strukturu, toplinska svojstva i toplinsku postojanost materijala od kojeg su izrađene niti za košnju. Primjenom infracrvene spektroskopije s…
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Journal Article Full text
Volatile Compounds in Merlot Wine Pomace Extract Obtained by Supercritical Fluid Extraction
The valorisation of grape pomace, a major by-product of winemaking, presents both an environmental challenge and a resource opportunity. This study investigates the volatile compounds present in Merlot grape pomace extracts obtained by supercritical fluid extraction (SFE) using carbon dioxide as…
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