In the next block processing features to detect a particular event in the case
external devices, or to identify, study, and signal the brain to recognize patterns,
will be used as input for the following blocks that translate to control
command of the external device.
Last but not least important, is the block set effects supervision Operative
mode of BCI devices under the supervision of users, this is if the device is active in on-line
/ Off linemode, or if it ismodifying its internal parameters in the learning phase in order
to regulate the activity of users....
The stereolithographic (SL) process is performed on the equipment
shown in Figure 1. The movable platform on which the 3D model is
formed is initially immersed in a vat of liquid photopolymer resin to a
level just below its surface so that a thin layer of the resin covers it. The
SL equipment is located in a sealed chamber to prevent the escape of
fumes from the resin vat.
The resin changes from a liquid to a solid when exposed to the ultra-
violet (UV) light from a low-power, highly focused laser.
Because the photopolymer used in the SL process tends to curl or sag
as it cures, models with overhangs or unsupported horizontal sections
must be reinforced with supporting structures: walls, gussets, or
columns. Without support, parts of the model can sag or break off before
the polymer has fully set. Provision for forming these supports is
included in the digitized fabrication data. Each scan of the laser forms
support layers where necessary while forming the layers of the model.
Dry andwet etching techniques based onsiliconand other semiconductor technologies
are well known. For many metals, etching is a relatively cheap and well-established
technique to obtain freeform structures with dimensions in the submillimeter range.
This technique iswelldescribedinthe literature[1–5,7].Aphotosensitivepolymermask
material is applied on themetal to be etched. Themask is exposed to light via a primary
maskwithstructural layers.Here,different technologiesare applicable, andtheirdetails