Wyniki wyszukiwania dla: A. Dupret

Pozycje od 1 do 20 spośród 43 wyników

Poprzednia

Następna

artykuł

PLATO as it is: A legacy mission for Galactic archaeology

A. Miglio, C. Chiappini, B. Mosser, G. R. Davies, więcej

Astronomische Nachrichten > 338 > 6 > 644 - 661

Deciphering the assembly history of the Milky Way is a formidable task, which becomes possible only if one can produce high‐resolution chrono‐chemo‐kinematical maps of the Galaxy. Data from large‐scale astrometric and spectroscopic surveys will soon provide us with a well‐defined view of the current chemo‐kinematical structure of the Milky Way, but it will only enable a blurred view on the temporal...

artykuł

Intractable epistaxis: which arteries are responsible? An angiographic study

Guillaume Bonnecaze, Y. Gallois, P. Chaynes, F. Bonneville, więcej

Surgical and Radiologic Anatomy > 2017 > 39 > 11 > 1203-1207

Purpose Epistaxis constitutes a significant proportion of the Otolaryngologist’s emergency workload. Optimal management differs in relation to the anatomic origin of the bleeding. The outcome of our study was to determine which artery(ies) could be considered as the cause of severe bleeding in the context of severe epistaxis. Methods Fifty-five procedures of embolization preceded by angiography...

artykuł

ADC sampling reduction by an efficient implementation of queue application to X-ray spectrometry imagers

J.-P. Rostaing, G. Sicard, A. Dupret, A. Peizerat, więcej

Electronics Letters > 2016 > 52 > 6 > 428 - 430

In a high-speed digital X-ray imager, each pixel in the matrix needs an analogue-to-digital converter (ADC) in order to assess the energy of the randomly incoming photons. The analogue-to-digital (AD) conversion rate is thus highly dependent on the photon flux parameters, i.e. its mean and its standard deviation. In classic designs, this rate is often set to ten times the maximum photon flux mean,...

artykuł

Sudden ocular ptosis

J. Carvalho, S. Cahen-Riehm, C. Debry, A. Dupret-Bories

European Annals of Otorhinolaryngology, Head and Neck Diseases > 2016 > 133 > 1 > 67-69

artykuł

Embedded OMTDR Sensor for Small Soft Fault Location on Aging Aircraft Wiring Systems

W. Ben Hassen, M. Gallego Roman, B. Charnier, N. Ravot, więcej

Procedia Engineering > 2016 > 168 > C > 1698-1701

Based on OMTDR technology, the first embedded Smart Connector (SmartCo) which could locate very small soft defects resulting from partial degradation of cables is introduced in this paper. To do so, the SmartCo injects the generated OMTDR signal at an extremity of the cable and then listens to the echoes created at each discontinuity of the cable characteristic impedance. Since soft defects result...

artykuł

High-order incremental sigma–delta for compressive sensing and its application to image sensors

W. Guicquero, A. Verdant, A. Dupret

Electronics Letters > 2015 > 51 > 19 > 1492 - 1494

ΣΔ ADCs show promising perspectives in the field of compressive sensing (CS). A major limitation related to the first-order ΣΔ is its high oversampling ratio (OSR) that is required for a specific bit resolution. An extension to the high-order incremental ΣΔ for the implementation of a dedicated image sensor is presented. By extending the concept of the ΣΔ CS ADC, optimal working points can be reached...

rozdział

A 3T or 4T pixel compatible DR extension technique suitable for 3D-IC imagers: A 800×512 and 5μm pixel pitch 2D demonstrator

A. Peizerat, F. Guezzi, M. Benetti, A. Dupret, więcej

2015 IEEE International Symposium on Circuits and Systems (ISCAS) > 1094 - 1097

2015 IEEE International Symposium on Circuits and Systems (ISCAS)

In this paper is presented a High Dynamic Range (HDR) extension technique that applies to an imager without modifying any of its other specifications (as speed, noise floor or pixel scheme). The technique relies on the division of the focal plane into blocks that are able to choose the integration time from a set of eleven exposures, reaching +60db extension compared to a standard CMOS imager. The...

rozdział

Nonuniform sampling with adaptive expectancy based on local variance

W. Guicquero, A. Verdant, A. Dupret, P. Vandergheynst

2015 International Conference on Sampling Theory and Applications (SampTA) > 254 - 258

2015 International Conference on Sampling Theory and Applications (SampTA)

A new trend in sensor array architectures is to provide compact implementations based on alternative acquisitions and sampling. In particular, with the recent rise of Compressive Sensing (CS), multiple sensing schemes have been developed. However, for the moment, CS reconstruction techniques take a relatively long time to properly converge. Therefore, it limits the sensor resolution and potential...

rozdział

On multiple spectral dependent blurring kernels for super-resolution and hyperspectral imaging

W. Guicquero, P. Vandergheynst, T. Laforest, A. Verdant, więcej

2014 IEEE Global Conference on Signal and Information Processing (GlobalSIP) > 717 - 721

2014 IEEE Global Conference on Signal and Information Processing (GlobalSIP)

A new approach to perform the acquisition and the reconstruction of spatially super-resolved hyperspectral images is presented. The proposed hyperspectral sensing strategy is based on acquiring several low-resolved grayscale images following a specific acquisition scheme which takes profit from different spectral dependent blurring kernels. The proposed model describes how output grayscale pixels...

rozdział

On adaptive pixel random selection for compressive sensing

W. Guicquero, P. Vandergheynst, T. Laforest, A. Dupret

2014 IEEE Global Conference on Signal and Information Processing (GlobalSIP) > 712 - 716

2014 IEEE Global Conference on Signal and Information Processing (GlobalSIP)

Recently developed Compressive Sensing image sensor architectures tend to provide compact on-chip implementations to perform alternative acquisitions. On the other hand, the time of reconstruction generally limits possible applications taking advantage of those specific sensing schemes. This work proposes an entire Compressive Sensing system composed of an encoder (a dedicated imager top-level architecture)...

rozdział

On compensating unknown pixel behaviors for image sensors with embedded processing

W. Guicquero, M. Benetti, A. Peizerat, A. Dupret, więcej

2014 48th Asilomar Conference on Signals, Systems and Computers > 933 - 937

2014 48th Asilomar Conference on Signals, Systems and Computers

Some smart imagers embed image processing operations or Compressive Sensing at the focal plane level. This process introduces artifacts due to technology dispersion and unpredictable behaviors. This article presents a generic algorithm structure well suited for compensating block artifacts by appropriate post processing operations. The proposed restoration method is composed by a three steps loop:...

artykuł

Cetuximab plus platinum-based chemotherapy in elderly patients with recurrent or metastatic head and neck squamous cell carcinoma: A French experience from a single institution

M. Burgy, P. Barthélémy, A. Dupret-Bories, P. Truntzer, więcej

Journal of Geriatric Oncology > 2014 > 5 > Supplement 2 > S40

rozdział

A 533pW NEP 31×31 pixel THz image sensor based on in-pixel demodulation

A. Boukhayma, J.-P. Rostaing, A. Mollard, F. Guellec, więcej

ESSCIRC 2014 - 40th European Solid State Circuits Conference (ESSCIRC) > 303 - 306

ESSCIRC 2014 - 40th European Solid State Circuits Conference

A THz 31×31 pixel, 100 fps image sensor integrated in a 130 nm CMOS process is presented. Taking advantage of the possibility to modulate the active source that lights the scene, a significant improvement in sensitivity and NEP is achieved by shifting the modulated THz radiation, by means of an antenna/MOSFET, then filtering the signal band using an in-pixel 16-paths passive SC-filter combined with...

rozdział

An adaptive compressive sensing with side information

W. Guicquero, A. Dupret, P. Vandergheynst

2013 Asilomar Conference on Signals, Systems and Computers > 138 - 142

2013 Asilomar Conference on Signals, Systems and Computers

Compressive sensing [1] [2] measurements generally do not provide as much understandable information as traditional compressed domains. On the other hand, with the rise of compressive sensing image sensors, it becomes necessary to define relevant sensing schemes. Applying the same linear projection to reduced signal supports optimizes the reconstruction time and makes the sensing strategy more suitable...

rozdział

Multi-capture High Dynamic Range compressive imaging

W. Guicquero, A. Dupret, P. Vandergheynst

2013 Asilomar Conference on Signals, Systems and Computers > 143 - 147

2013 Asilomar Conference on Signals, Systems and Computers

We propose a novel approach to reconstruct High Dynamic Range images from few compressive measurements. The reconstruction algorithm directly merges the information of multi-capture bayerized images. It simultaneously performs demosaicing and naive predefined tone-mapping. Two different color spaces are taken into account at the reconstruction stage to add multiple constraints on the signal. The proposed...

rozdział

New 3D-integrated burst image sensor architectures with in-situ A/D conversion

R. Bonnard, F. Guellec, J. Segura, A. Dupret, więcej

2013 Conference on Design and Architectures for Signal and Image Processing > 215 - 222

2013 Conference on Design and Architectures for Signal and Image Processing (DASIP)

It is well known that 3D integration technology brings a lot to image sensors in term of fill-factor and in-situ processing. As 3D stacking allows massively parallel processing, it looks like an effective way to store the image close to the pixel in burst image sensor. This paper discusses two new 3D stacked architectures for burst high speed imaging with in-situ A/D conversion, one with analog memories,...

artykuł

Testing the effects of opacity and the chemical mixture on the excitation of pulsations in B stars of the Magellanic Clouds

S. Salmon, J. Montalbán, T. Morel, A. Miglio, więcej

Monthly Notices of the Royal Astronomical Society > 422 > 4 > 3460 - 3474

The B‐type pulsators known as β Cephei and slowly pulsating B (SPB) stars present pulsations driven by the κ mechanism, which operates thanks to an opacity bump due to the iron‐group elements. In low‐metallicity environments such as the Magellanic Clouds, β Cep and SPB pulsations are not expected. Nevertheless, recent observations show evidence for the presence of B‐type pulsator candidates in both...

artykuł

Towards an effective asteroseismology of solar‐like stars: time‐dependent convection effects on pulsation frequencies

A. Grigahcène, M.‐A. Dupret, S. G. Sousa, M. J. P. F. G. Monteiro, więcej

Monthly Notices of the Royal Astronomical Society: Letters > 422 > 1 > L43 - L47

Since the early days of helioseismology, adiabatic models have shown their limits for a precise fitting of individual oscillation frequencies. This discrepancy, which also exists for solar‐type stars, is known to originate near the surface superadiabatic convective region where the interaction between oscillations and convection is likely to have a large effect on the frequencies. We present an asteroseismic...

artykuł

Slowing down atomic diffusion in subdwarf B stars: mass loss or turbulence?

Haili Hu, C. A. Tout, E. Glebbeek, M.‐A. Dupret

Monthly Notices of the Royal Astronomical Society > 418 > 1 > 195 - 205

Subdwarf B (sdB) stars show chemical peculiarities that cannot be explained by diffusion theory alone. Both mass loss and turbulence have been invoked to slow down atomic diffusion in order to match observed abundances. The fact that some sdB stars show pulsations give upper limits on the amount of mass loss and turbulent mixing allowed. Consequently, non‐adiabatic asteroseismology has the potential...

rozdział

A broadband THz imager in a low-cost CMOS technology

F Schuster, H Videlier, A Dupret, D Coquillat, więcej

2011 IEEE International Solid-State Circuits Conference > 42 - 43

2011 IEEE International Solid- State Circuits Conference (ISSCC 2011)

The paper demonstrates a complete acquisition chain of a 300GHz to 1THz image sensor with on-chip multiplexing in a 0.13μm bulk silicon CMOS technology. The pixel consumes less than 100μW and has a responsivity of 90kV/W at 300GHz and of 1.8kV/W at 1.05THz respectively. High resolution and contrast THz images revealing the inner structure of tree leaves are presented. These results show that multi-frequency...

Poprzednia

Następna

Opcje filtrowania

Data publikacji

Ustaw własny zakres dat

INFONA - portal komunikacji naukowej

Wyniki wyszukiwania dla: A. Dupret

PLATO as it is: A legacy mission for Galactic archaeology

Intractable epistaxis: which arteries are responsible? An angiographic study

ADC sampling reduction by an efficient implementation of queue application to X-ray spectrometry imagers

Sudden ocular ptosis

Embedded OMTDR Sensor for Small Soft Fault Location on Aging Aircraft Wiring Systems

High-order incremental sigma–delta for compressive sensing and its application to image sensors

A 3T or 4T pixel compatible DR extension technique suitable for 3D-IC imagers: A 800×512 and 5μm pixel pitch 2D demonstrator

Nonuniform sampling with adaptive expectancy based on local variance

On multiple spectral dependent blurring kernels for super-resolution and hyperspectral imaging

On adaptive pixel random selection for compressive sensing

On compensating unknown pixel behaviors for image sensors with embedded processing

Cetuximab plus platinum-based chemotherapy in elderly patients with recurrent or metastatic head and neck squamous cell carcinoma: A French experience from a single institution

A 533pW NEP 31×31 pixel THz image sensor based on in-pixel demodulation

An adaptive compressive sensing with side information

Multi-capture High Dynamic Range compressive imaging

New 3D-integrated burst image sensor architectures with in-situ A/D conversion

Testing the effects of opacity and the chemical mixture on the excitation of pulsations in B stars of the Magellanic Clouds

Towards an effective asteroseismology of solar‐like stars: time‐dependent convection effects on pulsation frequencies

Slowing down atomic diffusion in subdwarf B stars: mass loss or turbulence?

A broadband THz imager in a low-cost CMOS technology

Opcje filtrowania

Data publikacji

Dostępność treści

Typ publikacji

Słowa kluczowe

Zbiór danych

Czasopismo

INFONA - portal komunikacji naukowej

Wyniki wyszukiwania dla: A. Dupret

Dodaj adresata

Anulowanie wysłania wiadomości

Czy na pewno chcesz anulować wysłanie wiadomości?

Wyślij wiadomość

Opcje filtrowania

Data publikacji

Ustawianie zakresu dat

Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.

Dostępność treści

Typ publikacji

Słowa kluczowe

Zbiór danych

Czasopismo

Zgłaszanie błędu / nadużycia

Nieudane wysłanie zgłoszenia

Ułatwienia dostępu