Furthermore, 16% of episodes occurred during laparoscopic surgery, suggesting that sight of the operation remains a strong contributory factor even when the associated stimulations of open surgery are removed.
In both cases, an appropriate physical MIMO channel model is assumed which takes into account the propagation phenomena related to the frequencies of interest, such as clear line-of-sight operation, high antenna directivity, the effect of rain fading, and the slant path lengths difference.
In addition, it also provides wide area coverage, mobility support, and non-line-of-sight operation.
In this study, where line-of-sight operation is required, geographical terrain data is obtained from the NGA/NASA "Shuttle Radar Topography Mission" [28].
Among various techniques, electrochemical methods offer merits such as mild processing conditions, non-line-of-sight operation, low cost, as well as large-scale production.
Using the ranges calculated in the previous section, and assuming line-of-sight operation is required, it is possible to simulate radio propagation and determine appropriate placement of base stations to serve known subscriber sites.
Airware's Jesse Kallman tells me that he believes that while the bill doesn't explicitly talks about beyond line of sight flights, "the risk-based permitting section leaves it open to be used for beyond-line-of-sight flights or any other types of operation.
The air interface of some wireless technologies supports non-line-of-sight (NLOS) operations.
Their DT18 was the first and only UAV in the world certified for "beyond visual line of sight" (BVLOS) operations.
Sites were selected on the basis of several factors: cumulatively, beaches were (1) a mix of spawn/spawn-free, (2) representative of the regional supratidal and intertidal habitat accessible by bears, (3) not within sight of commercial roe-on-kelp operations (to reduce disturbance), and (4) accessible by boat or foot.
