Context. Submillimeter galaxies (SMGs) have been proposed as the progenitors of massive ellipticals in local Universe. Mapping neutral gas distribution and investigating accretion toward SMGs at high redshift can provide information on way SMG environments evolve into clusters z = 0. Aims. In this work, we study members protocluster around AzTEC-3, a submillimeter galaxy 5.3. We use Ly α emissi...

We use our very deep Keck Deep Fields UnGRI catalog of z∼4, 3, and 2 UV-selected star-forming galaxies to study the evolution of the rest-frame 1700Å luminosity density at high redshift — a study that is motivated by our finding of luminosity-dependent evolution of the galaxy luminosity function at high redshift. Ours is the most robust UV luminosity density measurement to date at these redshif...

We compare the performance of ve algorithms for vector quan-tisation and clustering analysis: the Self-Organising Map (SOM) and Learning Vector Quantization (LVQ) algorithms of Kohonen, the Linde-Buzo-Gray (LBG) algorithm, the MultiLayer Perceptron (MLP) and the GMM/EM algorithm for Gaussian Mixture Models (GMM). We propose that the GMM/EM provides a better representation of the speech space an...

The graft copolymer of locust bean gum (LBG) and acrylamide has been synthesized by microwave assisted method using potassium persulphate (KPS) as an initiator in aqueous medium. Different reaction parameters such as time, initiator concentration, monomer concentration, polymer concentration, and microwave power were studied to get maximum graft copolymer. The grafted copolymer was characterize...

A new distance norm [5] is used with the LBG algorithm and its eectiveness in achieving minimum distortion is studied with respect to Euclidean and L 1 norms. Partial Sum and Nearest Neighbouring Distance (NND) approaches are used with this new norm to reduce vector quantization (VQ) codebook design time. The mean square error (MSE) achieved with this new norm is similar to that of the conventi...

In recent years, principal component analysis (PCA) has attracted great attention in image compression. However, since the compressed image data include both the transformation matrix (the eigenvectors) and the transformed coefficients, PCA cannot produce the same performance as DCT (discrete Cosine transform) in respect of compression ratio. In using DCT, we need only to preserve the coefficie...

We predict the formation histories, properties and descendants of Lyman-break galaxies (LBGs) in the cold dark matter cosmology. In our model, which incorporates a top-heavy initial mass function in starbursts, we find that most LBGs are starbursts triggered by minor mergers of galaxies. The duration of the LBG phase is predicted to be quite short, ∼ 20– 60 Myr. We investigate the distributions...

On the WWW, the transmission time for videos and images impacts the performance of a web site. In order to reduce the bandwidth that is used to transmit images over the Internet, most image formats adopt only a limited number of colors used simultaneously to display color images on a video monitor. Hence, generating a good color palette for a color digitized image is an important task for Inter...

The aims of this study were the extraction of hemicellulose from wheat straw (WS) and its utilization in the reinforcement of a κ-carrageenan/locust bean gum (κ-car/LBG) polymeric blend films (PBFs). WS hemicellulose extraction was performed under autohydrolysis process and hemicellulose extracted (HE) under optimum condition was used in PBFs. PBFs were prepared varying different proportions of...

Vector quantization (VQ) has received a great attention in the field of multimedia data compression since last few decades because it has simple decoding structure and can provide high compression ratio. In general, algorithms of VQ codebook generation focus on solving two kinds of problem: (i) to determine the quantization regions and the code words that minimize the distortion error. (ii) to ...