In this paper, a modified Gaussian Mixture Model algorithm based on dependable spatial constraints is proposed for image segmentation. In order to enhance the segmentation performance, the proposed algorithm utilizes the consistence between the pixel and its local window to discriminate uncorrupted pixels from corrupted pixels. Then, using these uncorrupted pixels, the dependable spatial constr...

A new Student’s t-distribution finite mixture model is proposed which incorporates the local spatial information of the pixels. The pixels’ label probability proportions are explicitly modelled as probability vectors in the proposed model. We use the gradient descend method to estimate the parameters of the proposed model. Comprehensive experiments are performed for synthetic and natural graysc...

Functional cell-to-cell variability is ubiquitous in multicellular organisms as well as bacterial populations. Even genetically identical cells of the same cell type can respond differently to identical stimuli. Methods have been developed to analyse heterogeneous populations, e.g., mixture models and stochastic population models. The available methods are, however, either incapable of simultan...

Because of the importance of microbial metabolites of cholesterol as precursors in the synthesis of steroidal drugs, we decided to study the ability of Arthrobacter simplex to degrade cholesterol. Arthrobacter simplex cleaves the side chain of cholesterol in the presence of 2,2'-dipyridyl and produces 4-androstene-3,17- dione (AD) and androsta- 1,4-diene-3,17-dione(ADD). Two other intermedi...

We define a SDP framework based on the RLS TD algorithm and multivariate simplex B-splines. We introduce a local forget factor capable of preserving the continuity of the simplex splines. This local forget factor is integrated with the RLS TD algorithm, resulting in a modified RLS TD algorithm that is capable of tracking time-varying systems. We present the results of two numerical experiments,...

to investigate the possibility of tank-mix application of two herbicides; cruz (nicosulfuron 4% sc) and bromicide ma (bromoxinil+ mcpa 40 % ec) for control of weeds in corn an experiment was carried out in jiroft and kahnoj agricultural research center during 2009. the experiment was conducted in a factorial experiment based on randomized complete block design with four replications. the first ...

The gasification progress which was coupled between heat transfer and fluid-flow on rib-tube of Open Rack Vaporizer (ORV) was studied in this paper. Based on theoretical analysis and experiment, the k ε − model and wall-function were chose to simulate the flow field of rib-tube, and the multiphase flow was described by the mixture model, in which the dispersed phase was defined by different vel...

This paper presents a voice conversion (VC) technique for noisy environments based on a sparse representation of speech. In our previous work, we discussed an exemplar-based VC technique for noisy environments. In that report, source exemplars and target exemplars are extracted from the parallel training data, having the same texts uttered by the source and target speakers. The input source sig...

The Hessian of the multivariate normal mixture model is derived, and estimators of the information matrix are obtained, thus enabling consistent estimation of all parameters and their precisions. The usefulness of the new theory is illustrated with two examples and some simulation experiments. The newly proposed estimators appear to be superior to the existing ones. AMS 1991 subject classificat...

We describe our participation in the TREC 2007 Enterprise track and detail our language modeling-based approaches. For document search, our focus was on estimating a mixture model using a standard web collection, and on constructing query models by employing blind relevance feedback and using the example documents provided with the topics. We found that settings performing well on a web collect...