Cluster-based structure is not a new research topic but it still challenges the scientists. In wireless sensor network, cluster-based is one of important approaches to achieve effective network performance such as energy saving, throughput maximizing, end-to-end delay and maintenance cost decreasing, etc. In this paper, we propose a clustering scheme which utilizes the geographical information ...

This paper proposes a technique for three-dimensional reconstruction of an underwater environment from range views acquired by an acoustic camera. The final target of the work lies in improving the understanding of a human operator driving an underwater remotely operated vehicle floating close to an offshore structure. Due to the narrow field of view and the absence of control of the sensor pos...

This paper presents a description of a very low cost underwater vehicle project, specifically about a remotely operating vehicle (ROV). The main motivation of this research is based on the fact that underwater robotics in Brazil is a recent scientific domain, particularly in experimental aspects. A few project specifications were established, and the actuators, sensors, structure and onboard el...

The development of new technologies in urban automation has increasingly intensified in recent decades. Among the research initiatives, there is the study and design of service robots for home tasks, such as: cleaning floors, windows, and pools. The technology used in these robots depends on specific resources and great investments, and consequently, the price is expensive, restricting the use ...

This paper presents a vision based tracking system for routine underwater pipeline or cable inspection for autonomous underwater vehicles (AUV’s). The objective of this research paper is to investigate the issues of pipeline detection, including pose and orientation measurements in underwater environments. The proposed visual tracking system used an active contour method to track underwater obj...

Underwater sensor nodes will find applications in oceanographic data collection, pollution monitoring, offshore exploration, disaster prevention, assisted navigation and tactical surveillance applications. Moreover, unmanned or autonomous underwater vehicles (UUVs, AUVs), equipped with sensors, will enable the exploration of natural undersea resources and gathering of scientific data in collabo...

Several numerical and analytical models have been used to study underwater acoustics problems. The most accurate and realistic models are usually based on the solution of the wave equation using a variety of methods. Here, a hybrid numerical-analytical model is proposed to address the problem of underwater sound scattering by an elastic shell structure, which is assumed to be circular and that ...

Time reversal mirror (TRM) can adaptively match the sound channel without any prior knowledge. In this paper, active TRM, passive TRM and virtual TRM which are all based on a single array element and the application of TRM in the underwater acoustic communication including single-user communication and multi-user communication are studied. Single sensor TRM which has time compression performanc...