[Purpose] The purpose of this study was to investigate the effects of underwater treadmill gait training on the balance ability of stroke patients. [Subjects] Twenty-two patients with stroke were randomly assigned to an underwater treadmill group (n =11) or a control group (n =11). [Methods] Both groups received general rehabilitation for 30 min per session, 5 times per week, over a 4-week peri...

Camera calibration is essential to obtain 3D information from 2D image, for underwater camera self-calibration, because the linear model can not accurately describe the imaging geometry of real cameras, the underwater camera nonlinear model and its calibration method are studied. According to the relationship between underwater and air in the camera focal length, principal point and no vertical...

Tracking underwater targets is a focused application area in modern underwater defence systems. Using traditional techniques based on imaging or sensor arrays may be difficult and impractical in some mission-critical systems. Alternatively, the underwater wireless sensor network UWSN is able to offer a promising solution. This paper tackles the problem of accurately tracking underwater targets ...

Underwater localization is a crucial capability for reliable operation of various types of underwater vehicles including submarines and underwater robots. However, sea water is almost impermeable to high-frequency electromagnetic waves, and thus absolute position fixes from Global Positioning System (GPS) are not available in the water. The use of acoustic telemetry systems such as Long Baselin...

This article analyzes environmental security in the sphere of sea navigation, safety of navigation and tourism on the Adriatic Sea, bearing in mind that keeping marine environment healthy is one of fundamental factors of today’s national and international security. Likewise, secure underwater environment strengthens public security from hazards deriving from seafloor caused by human negligence ...

Conventional underwater sensors are not well suited to the task of aiding unmanned underwater vehicles to hover. These sensors suffer from several drawbacks such as low sampling rates, low resolution, complexity of operations, drift and cost. Underwater video cameras, however, can provide local measurements of position with respect to a local object. Underwater vision presents several challenge...

Princess’ Mobile Medical Unit. The clinicians had been asked to provide information to local caregivers on topics such as normal responses to trauma, coping strategies after catastrophic events, and posttraumatic stress disorder (PTSD) in adults and children. They were also asked to bring the brief stabilization model (now called Trauma First Aide [TFA], derived from Somatic Experiencing [SE]) ...

Sea turtles spend much of their life in aquatic environments, but critical portions of their life cycle, such as nesting and hatching, occur in terrestrial environments, suggesting that it may be important for them to detect sounds in both air and water. In this study we compared underwater and aerial hearing sensitivities in five juvenile green sea turtles (Chelonia mydas) by measuring auditor...

Significant numbers of bird species forage on the tubers of the submerged aquatic species. This resource is difficult to map due to the submerged nature of these species. Because the temperature is the primary driving factor of photosynthesis in these vegetation species, it is possible to map the distribution and biomass production of these submerged species indirectly. For the relative short g...

The purpose of the present work was to study swimmers' efficiency during the underwater phase of the grab start. Eight high-level swimmers participated in this study. They performed two types of start: a regular grab start (with underwater leg propulsion after the glide) and a grab start with no underwater movement (swimmers had to remain in a streamlined position). Four cameras filmed the enti...