[Voir la version anglaise de l'article ici : www.cmaj.ca/lookup/doi/10.1503/cmaj.240267][1] La maladie à streptocoques du groupe A invasif est définie par pénétration Streptococcus pyogenes dans des tissus profonds et stériles, notamment les muscles ou le sang[1][2]. Environ 35 %–40

The phase-sensitive or 'lock-in' amplifier is a fundamental tool in experimental physics, and able to extract exceedingly small signals the presence of noise. Recently, there has been some interest portable embedded lock-in amplifiers for instrumentation sensing. One difficulty with digital lock-ins required degree numerical precision. Presented fast algorithm combined multiplication filtering. It exploits symmetry reduce number arithmetic operations, suitable low-power devices. As well as...

This paper describes the important considerations in cryo-electron tomography (CET) of biological specimens and identifies areas where digital signal processing can make a decisive contribution.

Detection of methane gas which may be approaching the concentration limit when explosive ignition could occur is an important industrial problem. Optical methods for detection are attractive, and near-infrared (IR) wavelengths especially suited to hydrocarbon gases. Unfortunately, temperature-related drift solid-state IR sources problematic. A method stabilizing response a near-IR system operating at 2350 nm presented in this paper. The employs broadband LED source wideband photodetector....

In this paper, we propose a new unequal error protection (UEP) scheme, called video packet partitioning for three-dimensional (3-D) transmission. We also 3-D transceiver structure that adopts various UEP schemes based on the partitioning. The proposed are applied modern techniques, i.e., multiview coding (MVC) and color plus depth (VpD). MVC VpD tested over cooperative multiinput multi-output-orthogonal division multiplexing (MIMOOFDM) systems. For channel adaptation, switching operations...

Methane is the primary constituent of natural gas and used in many industrial processes. Detection presence methane important, especially before it reaches explosive concentrations. Earlier sensor types are based on catalytic adsorption (which may limit lifetime) at elevated temperatures (requiring additional power possibly compromising safety). Recently, optical sensors infrared (IR) absorption by hydrocarbon molecules have become an important research focus. One unsolved problem when using...

The authors report the identification and quantification of components a ternary vapor mixture using microcantilever-based electronic nose. An artificial neural network was used for pattern recognition. Dimethyl methyl phosphonate in ppb concentrations water ethanol vapors ppm were quantitatively identified either individually or binary mixtures at varying concentrations.

Detection of gases in industrial contexts is great importance for ensuring safety storage and transport order to limit atmospheric pollution precisely control agricultural processes. Although chemical sensors are widespread use, solid-state infrared detectors gas sensing promise numerous advantages over conventional catalytic terms sensitivity, calibration requirements, lifetime. The laser-modulation photoacoustic approach an alternative. Compared other approaches, it provides more precise...

Covers advancements in spacecraft and tactical strategic missile systems, including subsystem design application, mission analysis, materials structures, developments space sciences, processing manufacturing, operations, applications of technologies to other fields.

We report the experimental details on successful application of electronic nose approach to identify and quantify components in ternary vapor mixtures. Preliminary results have recently been presented [L. A. Pinnaduwage et al., Appl. Phys. Lett. 91, 044105 (2007)]. Our microelectromechanical-system-based is composed a microcantilever sensor array with seven individual sensors used for detection an artificial neural network pattern recognition. A set custom generators generated reproducible...

In this paper, we propose a distributed turbo product code (DTPC) with soft information relaying over cooperative network using block extended bose Chaudhuri Hochquenghem (EBCH) codes as component codes. The source broadcasts EBCH coded frames to the destination and preassigned relay. After soft-decoding received sequences obtaining log-likelihood ratio (LLR) values, relay constructs by arranging decoded bit in rows re-encoding them along columns novel encoding technique obtain parity bits...

This paper presents a new face detection approach which is capable of detecting human faces from complex backgrounds. A skin color modeling process applied to the segmentation process. Image enhancement then used improve features candidates before feeding object classifier based on modified Hausdorff distance. The overall performance system evaluated and achieved success rate 87.5 %.

The phase-sensitive or "lock-in" amplifier is a fundamental tool in experimental physics, and able to extract exceedingly small signals the presence of noise. lock-in operates on principle synchronous excitation system under test, which effectively moves desired response above influence 1//f purpose paper twofold: (i) investigate numerical aspects implementation signal processing, particularly for computationally resource-constrained environments; (ii) tradeoff between A/D resolution...

The visual quality obtained in wireless transmission strongly depends on the characteristics of channel and error resilience source coding. extensions JPEG 2000 standard (JPWL) H.264 are latest international standards for still image video compression, respectively. However, few results have been reported to compare rate-distortion (R-D) performance H.264. Conversely, comparative studies between JPWL not thoroughly investigated. In this paper, we analyse coding based I-frame Rayleigh fading...

The wireless extension of the JPEG 2000 standard formally known as JPWL is newest international for still image compression. Different from all previous standards, this new was created specifically imaging applications. This paper examines error resilience performance JPEG, and standards in combating multi-path fading impairments Rayleigh channels. Comprehensive objective subjective results are presented relation to these three under various conditions. major findings reveal that a CRC...

Modeling the propagation of light from LED sources is problematic since emission covers a broad range wavelengths and thus cannot be considered as monochromatic. Furthermore, lack directivity such also problematic. Both attributes are characteristic LEDs. Here we propose HITRAN (high-resolution transmission molecular absorption database) based chemometric approach that incorporates not-perfect-monochromaticity spatial near-infrared (NIR) for absorbance calculations in 1–6% methane (CH4) air,...

Abstract The problem of crystal ice formation inside aircraft turbine engines is well‐documented, and poses a significant risk to safety. not only one power loss in flight, but the very real possibility that flame‐out event could occur due accretion on compressor stators, with potentially catastrophic outcomes. Although many instrumentation systems have been developed for wing detection, incipient somewhat more difficult detect. This compounded by need noncontact sensor which robust...