Subject:
All Disciplines Arts & Humanities Biology & Life Sciences Business & Economics Chemistry & Materials Science Computer Science & Mathematics Engineering Environmental & Earth Sciences Medicine & Pharmacology Physical Sciences Public Health & Healthcare Social Sciences
Sort:
Hottest Latest Alphabetical (A-Z) Alphabetical (Z-A)
Type:
All Topic Review Biography
Topic Review
Underwater Object Detection Using TC-YOLO with Attention Mechanisms
Underwater object detection is a key technology in the development of intelligent underwater vehicles. Object detection faces unique challenges in underwater applications: blurry underwater images; small and dense targets; and limited computational capacity available on the deployed platforms. TC-YOLO, is an image enhancement technique using an adaptive histogram equalization algorithm, and the optimal transport scheme for label assignment. 
  • 50
  • 01 Apr 2024
Topic Review
In-Line Inspection (ILI) Techniques for Subsea Pipelines
Offshore oil and gas resources play a crucial role in supplementing the energy needs of human society. The crisscrossing subsea pipeline network, which serves as vital infrastructure for the storage and transportation of offshore oil and gas, requires regular inspection and maintenance to ensure safe operation and prevent ecological pollution. In-line inspection (ILI) techniques have been widely used in the detection and inspection of potential hazards within the pipeline network. 
  • 54
  • 12 Mar 2024
Topic Review
Guideline for the Decommissioning/Abandonment of Subsea Pipelines
The operating lifespan of pipelines is limited, defined by their specific design codes and specifications, with the economic justification for this being determined primarily by the pipeline owner. During its operational lifespan, a pipeline’s integrity is affected mainly by the quality of the hydrocarbons being transported. The integrity of a pipeline can be maintained with regular inspections and maintenance/cleaning programmes followed from installation to commissioning. As production matures and declines, operators face several decisions concerning the pipeline’s future. There are several potential scenarios, and each should be assessed on a case-by-case basis for any specific pipeline in question. The industry best practices outline the minimum requirements for the safe decommissioning of pipelines. 
  • 157
  • 20 Feb 2024
Topic Review
Large Eddy Simulation of Propellers
Numerical computation methods for turbulence flow can be categorized into direct numerical simulation (DNS), large eddy simulation (LES), and Reynolds-averaged Navier–Stokes (RANS) based on grid resolution scales. With improvement in computer performance and the development of parallel computing, DNS and LES have been increasingly utilized both in research and engineering.
  • 79
  • 18 Dec 2023
Topic Review
Improving Semantic Segmentation Performance in Underwater Images
Semantic segmentation is an important task for the various fields of robotics, which often relies on visual data from cameras. Semantic segmentation is increasingly used in exploration by underwater robots, for example in autonomous navigation so that the robot can recognise the elements of its environment during the mission to avoid collisions. Other applications are found in the search for archaeological artefacts, in the inspection of underwater structures or in species monitoring.
  • 88
  • 06 Dec 2023
Topic Review
Feature-Based Place Recognition Using Forward Looking Sonar
Some structures in the harbour environment need to be inspected regularly. However, these scenarios present a major challenge for the accurate estimation of a vehicle’s position and subsequent recognition of similar images. In these scenarios, visibility can be poor, making place recognition a difficult task as the visual appearance of a local feature can be compromised. Under these operating conditions, imaging sonars are a promising solution. The quality of the captured images is affected by some factors but they do not suffer from haze, which is an advantage. Therefore, a purely acoustic approach for unsupervised recognition of similar images based on forward-looking sonar (FLS) data is proposed to solve the perception problems in harbour facilities. To simplify the variation of environment parameters and sensor configurations, and given the need for online data for these applications, a harbour scenario was recreated using the Stonefish simulator. Therefore, experiments were conducted with preconfigured user trajectories to simulate inspections in the vicinity of structures.The place recognition approach performs better than the results obtained from optical images. The proposed method provides a good compromise in terms of distinctiveness, achieving 87.5% recall considering appropriate constraints and assumptions for this task given its impact on navigation success. That is, it is based on a similarity threshold of 0.3 and 12 consistent features to consider only effective loops. The behaviour of FLS is the same regardless of the environment conditions and thus it opens new horizons for the use of these sensors as a great aid for underwater perception, namely, to avoid degradation of navigation performance in muddy conditions.
  • 183
  • 01 Dec 2023
Topic Review
Approaches of Offshore Inspection
Operators of offshore production units (OPUs) employ risk-based assessment (RBA) techniques in order to minimise inspection expenses while maintaining risks at an acceptable level. However, when human divers and workers are involved in inspections conducted at high heights, the operational risks can be significant. There has been a growing trend towards the use of unmanned aerial vehicles (UAVs), autonomous surface vehicles (ASVs), remotely operated vehicles (ROVs), and autonomous underwater vehicles (AUVs) for inspections of offshore structures as a means to reduce exposure to human risk.
  • 202
  • 24 Nov 2023
Topic Review
The Offshore Wind Farms Investigations Using Machine Learning
The offshore wind energy sector continues to make substantial progress, driven by the urgent need for renewable energy, climate change mitigation strategies, and the ambitious zero-emission objectives set by governments and local communities. Key drivers of this progress include scaling up offshore wind turbine dimensions to boost energy output, improving the efficiency of existing systems, addressing environmental concerns associated with these installations, exploring deeper waters for turbine deployment in areas with optimal wind conditions, and pursuing the innovation of floating offshore turbines. These challenges are at the forefront of efforts to advance the development, installation, operation, and maintenance of offshore wind energy systems.
  • 258
  • 11 Oct 2023
Topic Review
Subsea Power Cable Health Management
Subsea power cables are critical assets for electrical transmission and distribution networks, and highly relevant to regional, national, and international energy security and decarbonization given the growth in offshore renewable energy generation. Existing condition monitoring techniques are restricted to highly constrained online monitoring systems that only prioritize internal failure modes, representing only 30% of cable failure mechanisms, and has limited capacity to provide precursor indicators of such failures or damages.
  • 277
  • 13 Sep 2023
Topic Review
The Swimming Mode of Fish
Starting from the morphological function of fish, there are many swimming modes of fish in nature, the most authoritative classification of which, based on the organ of propulsion, was first proposed by Breder and Webb. There are two main categories of propulsion methods, body caudal fin (BCF) propulsion and median paired fin (MPF) propulsion. In 1978, Lindsey classified the different families of fish species according to their mode of propulsion, which provided the essential foundation for the improvement of the overall performance of undulating propulsion biomimetic robots.
  • 735
  • 05 Sep 2023
  • Page
  • of
  • 5
Featured Entry Collections
>>

Featured Books

>>
Encyclopedia of Social Sciences
Encyclopedia of COVID-19
Encyclopedia of Fungi
Encyclopedia of Digital Society, Industry 5.0 and Smart City
Feedback