다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

A fast-Fourier-transform method of topography and interferometry is proposed. By computer processing of a noncontour type of fringe pattern, automatic discrimination is achieved between elevation and depression of the object or wave-front form, which has not been possible by the fringe-contour-generation techniques. The method has advantages over moire topography and conventional fringe-contour interferometry in both accuracy and sensitivity. Unlike fringe-scanning techniques, the method is easy to apply because it uses no moving components.

Fourier-transform method of fringe-pattern analysis for computer-based topography and interferometry

We review the recent developments in the area of optical fiber grating sensors, including quasi-distributed strain sensing using Bragg gratings, systems based on chirped gratings, intragrating sensing concepts, long period-based grating sensors, fiber grating laser-based systems, and interferometric sensor systems based on grating reflectors.

Fiber grating sensors

The PASCAL Visual Object Classes Challenge

Dielectrophoretic clustering is obtained both for liquid and solid matter thanks to light shaping performed by phase only
Spatial Light Modulator (SLM). We present a procedure able to perform two functions: design polymeric stable
structures usable as microfluidic channels and trapping micro objects. These two tasks are combined to realize a single
device.
The liquid matter is Polydimethylsiloxane (PDMS) and its patterning in microstructures is developed by means of
photorefractive effect in a functionalized substrate. X-cut Iron-doped Lithium Niobate (LN) crystal is used as substrate
while a thin film of PDMS is spin on it. When LN, covered by PDMS, is exposed to structured laser light, a space charge
field arise that is able to induce self-patterning of the PDMS liquid film. The rearrangement of PDMS is due to the
dielectrophoretic effect.
Light structuring is achieved by a SLM positioned in the conjugated plane of the LN crystals. PDMS devices we
realized are microfluidic channels. The first step of our procedure is the computing of a suitable Computer Generated
Hologram (CGH) to be displayed by the SLM. An ideal target is designed and given as input to an Iterative Fourier
Transform Algorithm (IFTA) to calculate the CGH. The IFTA used has been implemented for this particular application
and it's tailored to generate a continuous light intensity profile in the LN plane.
Then PDMS microstructures are cured to induce solidification. Such PDMS channels are then used to trap particles
floating inside. Trapping is realized exploiting again dielectrophoresis induced by photorefractive effect. LN with PDMS
channel is exposed to laser light which present, now, a periodic two-dimensional intensity profile. The charge
distribution due to this second exposure is able to trap particle in the previously built channels.
We realize a device with high degree of flexibility avoiding the need of moulds fabrication.

Computer-generated hologram tailored for dielectrophoretic PDMS patterning

Cyclists travelling in urban areas are particularly at risk of harm from these emissions due to their increased breathing rate and proximity to vehicles. Our objective in this paper is to present a framework for routing of cyclists to mitigate the eﬀects of pollution. However, in contrast to classical exposure based studies that are based on am-bient pollution levels and travel times, the work presented here is also based on individualised ﬁtness and physiological parameters. A key ﬁnding of this work is that statistical analysis of random synthetic commutes in London demonstrate that the impact of street-level pollution is signiﬁcantly higher for less ﬁt individuals. Further, our work suggests that pollution inhalation highly-polluted areas may be modulated through an increase of cycle velocity. These ﬁndings establish personalised travel optimisation as an eﬀective method of reducing pollution risk, improving the net beneﬁts of active commuting.

Respiratory Aware Routing for Cyclists

Here we show a completely new concept of a compact holographic microscope that can ensure the multi-functionality by accomplishing simultaneously quantitative phase-contrast analysis and an accurate 3D tracking of particles and cells in microfluidics.

Holographic microscope with twins laser beams: A novel conceptual set-up for a multifunctional tool in biophotonics

Digital Holography (DH) in microscopy allows to retrieve in an accurate way the spatial coordinates of multiple moving particles, performing 3D tracking of the sample in the entire field of view. In particular, a posteriori quantitative multifocus phase-contrast imaging, suitable for 3D tracking of micro-objects, is one of the main features of the holographic approach. However, classical methods need to decouple amplitude and phase contributions of the reconstructed complex wavefronts to calculate target positions in 3D, due to the fact that the lateral displacements can be calculated only after refocusing step. In order to overcome this limitation, recently, a novel method of the simultaneous calculation of both axial and lateral coordinates of moving particles has been proposed. This is based on the novel concept of wavefronts matching, i.e. the 3D positions of micro-object, moving in 3D volume, are obtained by aligning wo subsequent holographic complex reconstructions, calculated at the same distance. We test this approach in different experimental conditions in order to highlight its effectiveness in bio-microfluidic applications.

Wavefronts matching: a novel paradigm for three-dimensional holographic particle tracking

Unique feature of DH for implementing numerical scanning of the reconstruction distance is used to characterize near-field propagation properties of phase structures imprinted into photorefractive Lithium Niobate crystals by biolenses as Red Blood Cells.

Pietro Ferraro

Papers

Computer-generated hologram tailored for dielectrophoretic PDMS patterning

Respiratory Aware Routing for Cyclists

Holographic microscope with twins laser beams: A novel conceptual set-up for a multifunctional tool in biophotonics

Wavefronts matching: a novel paradigm for three-dimensional holographic particle tracking

Bio-Lithography by RBC-lenses: DH Wavefront evaluation of imprinted structures in Lithium Niobate