49 research outputs found
A committee machine gas identification system based on dynamically reconfigurable FPGA
This paper proposes a gas identification system based on the committee machine (CM) classifier, which combines various gas identification algorithms, to obtain a unified decision with improved accuracy. The CM combines five different classifiers: K nearest neighbors (KNNs), multilayer perceptron (MLP), radial basis function (RBF), Gaussian mixture model (GMM), and probabilistic principal component analysis (PPCA). Experiments on real sensors' data proved the effectiveness of our system with an improved accuracy over individual classifiers. Due to the computationally intensive nature of CM, its implementation requires significant hardware resources. In order to overcome this problem, we propose a novel time multiplexing hardware implementation using a dynamically reconfigurable field programmable gate array (FPGA) platform. The processing is divided into three stages: sampling and preprocessing, pattern recognition, and decision stage. Dynamically reconfigurable FPGA technique is used to implement the system in a sequential manner, thus using limited hardware resources of the FPGA chip. The system is successfully tested for combustible gas identification application using our in-house tin-oxide gas sensors
Boson Fusion and Higgs production at the LHC in six fermion final states with one charged lepton pair
Boson boson scattering and Higgs production in boson boson fusion will be
actively investigated at the LHC. We have performed a parton level study of all
processes of the type using for the first
time a full fledged six fermion Monte Carlo event generator which employs exact
matrix elements at \O(\alpha_{em}^6). We have examined Higgs production in
vector boson fusion followed by the decay chain ,
including exactly all electroweak irreducible backgrounds. In the high mass
region we have compared the case of a relatively light Higgs with the no-Higgs
case. The integrated cross section for the latter case is more than twice that
in the former for a minimum invariant mass of the pair of about 800 \GeV.
We find, in a preliminary anlysis at parton level that, summing up the muon and
the electron channels, about 30 events are expected in the light Higgs case for
L=100 .Comment: Final version published in Phys.Rev.
TRANSFORM DOMAIN SLICE BASED DISTRIBUTED VIDEO CODING
Distributed video coding depends heavily on the virtual channel model. Due to the limitations of the side information estimation one stationary model does not properly describe the virtual channel. In this work the correlation noise is modelled per slice to obtain location-specific correlation noise model. The resulting delay from the lengthy Slepian-Wolf (SW) codec input is also reduced by reducing the length of SW codec input. The proposed solution does not impose any extra complexity, it utilizes the existing resources. The results presented here support the proposed algorithm
BEST FIT MODELS TEST FOR THE VIRTUAL CHANNEL IN DISTRIBUTED VIDEO CODING
Wyner-Ziv (WZ) video coding â a particular case of distributed video coding (DVC) â is a new video coding paradigm based on two major Information Theory results: the Slepian-Wolf and Wyner-Ziv theorems. Most of the solutions available in the literature, model the correlation noise between the original frame and the so-called side information by virtual channel. However most of the DVC solutions in the literature assume Laplacian distribution as noise virtual channel model, in this study we perform three goodness-of-fit tests, the Kolmogorov-Smirnov test and the Chi-Square test and log-Likelihood test to study the nature of the virtual channel. The results show that a mixture of 3 (or 4) mixture Gaussian model can best describe this virtual channel
QualitĂ© bactĂ©riologique et physique des eaux de lâOued Hassar (Casablanca, Maroc): CaractĂ©risation et analyse en Composantes principales
The objective of this study is to evaluate the bacteriological quality of water of Oued Hassar in relation to the wastewater of Mediounaâs location and also to apply a statistical analysis using the Principal Component Analysis (PCA) to correlate data of spatio-temporal variability of bacterial indicators with those of physical parameters (temperature, pH, electrical conductivity and turbidity). The average values obtained ââindicate that the water of this river contains a lot of amount of bacteria that indicates a faecal contamination. These values, for total coliforms, faecal coliforms and faecal Streptococci were hight and more than seven log10. Then the bacteriological quality of water of oued Hassar is classified in poor to very poor category. The Principal Component Analysis revealed that the indicator bacteria of faecal contamination presents negative correlations with the pH and the electrical conductivity, and positive correlations that are highly significant with turbidity.La prĂ©sente Ă©tude consiste Ă Ă©valuer la qualitĂ© bactĂ©riologique des eaux dâOued Hassar en relation avec les effluents de la localitĂ© de Mediouna et dâappliquer une mĂ©thode statistique dâAnalyse en Composantes Principales (ACP) pour corrĂ©ler les donnĂ©es de la variabilitĂ© spatio-temporelle des indicateurs bactĂ©riologiques Ă ceux des paramĂštres physiques (tempĂ©rature, pH, conductivitĂ© Ă©lectrique et turbiditĂ©). Les valeurs moyennes obtenues rĂ©vĂšlent que les eaux de ce cours dâeau prĂ©sentent une charge trĂšs importante en bactĂ©ries indicatrices de la contamination dâorigine fĂ©cale. Les teneurs en coliformes totaux, coliformes fĂ©caux et streptocoques fĂ©caux atteignent des valeurs importantes supĂ©rieures Ă sept log10. De ce fait, la qualitĂ© bactĂ©riologique des eaux dâOued Hassar est classĂ©e dans la catĂ©gorie mauvaise Ă trĂšs mauvaise. LâACP a rĂ©vĂ©lĂ© que les bactĂ©ries indicatrices de la contamination fĂ©cale prĂ©sentent des corrĂ©lations nĂ©gatives avec le pH et la conductivitĂ© Ă©lectrique et des corrĂ©lations positives et fortement significatives avec la turbiditĂ©
SymptÎmes rapportés par une population casablancaise utilisatrice de téléphones mobiles
This study was conducted in a Casablanca population that uses or not mobile phones (n = 700) through a questionnaire. The data collected were entered and processed using the sphinx Lexica which is a survey software and data analysis which includes the chi-square test. The results obtained show that there is a significant difference (p<0.05) between users and no-users of mobile phones for various symptoms including insomnia, nausea, dizziness, lack of appetite, auditory disturbances and visual disturbances. In the group of mobile users, there are significant differences (p<0.05) of different symptoms in relation to : sex, age, duration and frequency of use of GSM, call duration, use or not the handsfree kits and joint use of a laptop and other devices emitting electromagnetic waves.Cette Ă©tude a Ă©tĂ© rĂ©alisĂ©e chez une population casablancaise utilisatrice ou non de tĂ©lĂ©phones mobiles (n=700) par le biais dâun questionnaire. Les donnĂ©es recueillies ont Ă©tĂ© saisies et traitĂ©es en utilisant le sphinx lexica qui est un logiciel dâenquĂȘtes et dâanalyses des donnĂ©es qui comporte le test Chi-deux. Les rĂ©sultats obtenus montrent quâil existe une diffĂ©rence significative (p<0.05) entre les utilisateurs et les non-utilisateurs de tĂ©lĂ©phones mobiles pour les diffĂ©rents symptĂŽmes rapportĂ©s, notamment lâinsomnie, nausĂ©es, vertiges, manque dâappĂ©tit, perturbations auditives et perturbations visuelles. Dans le groupe utilisateurs des tĂ©lĂ©phones portables, il existe des diffĂ©rences significatives (p<0.05) des diffĂ©rents symptĂŽmes par rapport aux : sexe, Ăąge, durĂ©e et frĂ©quence dâutilisation des GSM, durĂ©e des communications, utilisation ou non des kits mains libres et lâusage dâun portable associĂ© Ă un ordinateur et dâautres appareils dĂ©gageant des ondes Ă©lectromagnĂ©tiques
ANTENNES RELAIS TELEPHONIQUES : QUELS EFFETS SUR LA SANTE ? EnquĂȘte rĂ©alisĂ©e sur une population casablancaise »
This study was conducted among a Casablanca population (n = 700) living or not in vicinity of cellular phone base stations through a questionnaire. The data collected were entered and processed using the sphinx Lexica which is a survey software and data analysis which includes the chi-square test. The results obtained show that there is a significant difference (p<0.05) between witnesses and people close to these relay stations for the various symptoms including insomnia, nausea, dizziness, lack of appetite, auditory disturbances and visual disturbances. In the group of people near the antennas, there are significant differences (p<0.05) of different symptoms in relation to : sex, age, distance and location relative to the base station, duration and time of exposure, and the joint use a laptop and other devices emitting electromagnetic waves.Cette Ă©tude Ă Ă©tĂ© rĂ©alisĂ©e chez une population casablancaise habitant ou non Ă proximitĂ© des antennes relais (n=700) par le biais dâun questionnaire. Les donnĂ©es recueillies ont Ă©tĂ© saisies et traitĂ©es en utilisant le sphinx lexica qui est un logiciel dâenquĂȘtes et dâanalyses des donnĂ©es qui comporte le test Chi-deux. Les rĂ©sultats obtenus montrent quâil existe une diffĂ©rence significative (p<0.05) entre les tĂ©moins et les habitants Ă proximitĂ© de ces stations relais pour les diffĂ©rents symptĂŽmes notamment : lâinsomnie, nausĂ©es, vertiges, manque dâappĂ©tit, perturbations auditives et perturbations visuelles. Dans le groupe des habitants Ă cotĂ© des antennes relais, il existe des diffĂ©rences significatives (p<0.05) des diffĂ©rents symptĂŽmes par rapport aux : sexe, Ăąge, distance et situation par rapport Ă lâantenne relais, durĂ©e et temps dâexposition, et lâusage conjoint dâun portable et dâautres appareils dĂ©gageant des ondes Ă©lectromagnĂ©tiques