Recht en web 2.0

De klassieke afnemers van internetdiensten zijn leveranciers geworden. Tekst, beeld en geluid wordt door gebruikers geplaatst op Twitter, Youtube, LinkedIn, Hyves, The Pirate Bay, etc. Iedereen is overal bereikbaar, anyone, anytime, anywhere. Door het gebruik van overvloedig beschikbare persoonlijke data verstevigt de overheid zijn governance en bedrijven hun marktpositie. We zijn hulpeloos zonder mobiel en internet. Onze vrienden zijn te vinden op sociale netwerken en je wordt gealarmeerd als bepaalde personen - mobieltjes- zich in je omgeving bevinden. De apparatuur wordt steeds slimmer en de controle door natuurlijke personen vervaagt. We hebben geen inzicht in alle (rechts)gevolgen van wat er gebeurt, door wat en door wie. Is dat de toekomst? Lees, verheugt u of vrees

Optical imaging of multimode interference patterns with a resolution below the diffraction limit

For the first time the optical interference pattern in multimode interference couplers operating at 1485 nm is made visible using an optical microscope. This is done by imaging the green light (519 and 545 nm) which is generated by upconversion at high pumping power levels in waveguides with a high erbium concentration. As the intensity of the green light is roughly proportional to the fourth power of the pump signal intensity it thus becomes possible to image the 1485 nm intensity distribution with a resolution limited by the diffraction limit for 519 and 545 nm ligh

Domain and Geometry Agnostic CNNs for Left Atrium Segmentation in 3D Ultrasound

Segmentation of the left atrium and deriving its size can help to predict and detect various cardiovascular conditions. Automation of this process in 3D Ultrasound image data is desirable, since manual delineations are time-consuming, challenging and observer-dependent. Convolutional neural networks have made improvements in computer vision and in medical image analysis. They have successfully been applied to segmentation tasks and were extended to work on volumetric data. In this paper we introduce a combined deep-learning based approach on volumetric segmentation in Ultrasound acquisitions with incorporation of prior knowledge about left atrial shape and imaging device. The results show, that including a shape prior helps the domain adaptation and the accuracy of segmentation is further increased with adversarial learning

Upconversion in Er-implanted Al2O3 waveguides

When pumped with a 1.48 mu m laser diode, Er-implanted Al/sub 2/O/sub 3/ ridge waveguides emit a broad spectrum consisting of several distinct peaks having wavelengths ranging from the midinfrared (1.53 mu m) to the visible (520 nm). In order to explain these observations, three different upconversion mechanisms are considered: cooperative upconversion, excited state absorption, and pair-induced quenching. It is found that for samples with a high Er concentration (1.4 at.%), cooperative upconversion completely dominates the deexcitation of the Er/sup 3+/ ions. For a much lower concentration (0.12 at.%), the influence of cooperative upconversion is strongly reduced, and another upconversion effect becomes apparent: excited state absorption. These conclusions are based on measurements of the luminescence emission versus pump intensity, and also on measured luminescence decay curves. The upconversion coefficient is found to be (4+or-1)*10/sup -18/ cm/sup 3//s; the excited state absorption cross section is (0.9+or-0.3)*10/sup -21/ cm/sup 2/. It is shown that in spite of these upconversion effects, a high fraction of the Er/sup 3+/ can be excited at low pump powers. For pump powers between 2 and 10 mW, the optimum Er concentration is calculated. The results show that for an Er concentration of 0.5 at.%, more than 2 dB/cm net optical gain is achievable at a pump power less than 10 m

Optical gain in erbium-implanted Al2O3 waveguides

Al/sub 2/O/sub 3/ ridge waveguides implanted with 1.3 at.% Er, pumped with 2.5 mW 1.47 mu m light show 4.5 dB/cm enhancement of a 1.53 mu m signal beam. The maximum gain is limited by cooperative upconversion effects. Calculations for lower Er concentrations show that 1 dB/cm net optical gain is possible at 10 mW pump powe