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However, we use mathematical arguments and simulations to show that adding simple, biologically motivated regularization of connectivity resolves this ambiguity in an interesting way weights are constrained such that the latent variable structure underlying the inputs can be extracted from the weights by using nonlinear dimensionality reduction methods.Great improvement has been made in the field of expressive audiovisual Text-to-Speech synthesis (EAVTTS) thanks to deep learning techniques. However, generating realistic speech is still an open issue and researchers in this area have been focusing lately on controlling the speech variability. In this paper, we use different neural architectures to synthesize emotional speech. We study the application of unsupervised learning techniques for emotional speech modeling as well as methods for restructuring emotions representation to make it continuous and more flexible. selleck inhibitor This manipulation of the emotional representation should allow us to generate new styles of speech by mixing emotions. We first present our expressive audiovisual corpus. We validate the emotional content of this corpus with three perceptual experiments using acoustic only, visual only and audiovisual stimuli. After that, we analyze the performance of a fully connected neural network in learning characteristics specific to different emotions for the phone duration aspect and the acoustic and visual modalities. We also study the contribution of a joint and separate training of the acoustic and visual modalities in the quality of the generated synthetic speech. In the second part of this paper, we use a conditional variational auto-encoder (CVAE) architecture to learn a latent representation of emotions. We applied this method in an unsupervised manner to generate features of expressive speech. We used a probabilistic metric to compute the overlapping degree between emotions latent clusters to choose the best parameters for the CVAE. By manipulating the latent vectors, we were able to generate nuances of a given emotion and to generate new emotions that do not exist in our database. For these new emotions, we obtain a coherent articulation. We conducted four perceptual experiments to evaluate our findings.Non-autoregressive architecture for neural text-to-speech (TTS) allows for parallel implementation, thus reduces inference time over its autoregressive counterpart. However, such system architecture does not explicitly model temporal dependency of acoustic signal as it generates individual acoustic frames independently. The lack of temporal modeling often adversely impacts speech continuity, thus voice quality. In this paper, we propose a novel neural TTS model that is denoted as FastTalker. We study two strategies for high-quality speech synthesis at low computational cost. First, we add a shallow autoregressive acoustic decoder on top of the non-autoregressive context decoder to retrieve the temporal information of the acoustic signal. Second, we further implement group autoregression to accelerate the inference of the autoregressive acoustic decoder. The group-based autoregression acoustic decoder generates acoustic features as a sequence of groups instead of frames, each group having multiple consecutive frames. Within a group, the acoustic features are generated in parallel. With the shallow and group autoregression, FastTalker retrieves the temporal information of the acoustic signal, while keeping the fast-decoding property. The proposed FastTalker achieves a good balance between speech quality and inference speed. Experiments show that, in terms of voice quality and naturalness, FastTalker outperforms the non-autoregressive FastSpeech baseline significantly, and is on par with the autoregressive baselines. It also shows a considerable inference speedup over Tacotron2 and Transformer TTS.Since 2000, the Israeli mental health system has undergone a reduction in hospital beds, initiation of community-based rehabilitation, and transfer of governmental services to health maintenance organizations. This study examined trends, predictors and outcomes of involuntary psychiatric hospitalizations (IPH), in particular for immigrants. All first psychiatric hospitalizations of adults, 2001-2018, in the National Psychiatric Case Registry were used. Involuntary and voluntary hospitalizations were analyzed by demographic and clinical characteristics, and age-adjusted rates calculated over time. Multivariate logistic regression models were used to investigate IPH predictors and first IPH as a risk factor for one-year suicide after last discharge, and a Cox multivariate regression model to examine its risk for all-cause mortality. Among 73,904 persons in the study, age-adjusted rates of IPH were higher between 2011 and 2015 and then decreased slightly until 2018. Ethiopian immigrants had the highest risk for IPH, immigrants from the former Soviet Union a lower risk, and that of Arabs was not significantly different, from non-immigrant Jews. IPH was not significantly associated with one-year suicide or all-cause mortality. These findings demonstrate the vulnerability of Ethiopian immigrants, typical of disadvantaged immigrants having a cultural gap with the host country and highlight the importance of expanding community mental health services.
Lung cancer is the most common type of cancer with a high mortality rate. Early detection using medical imaging is critically important for the long-term survival of the patients. Computer-aided diagnosis (CAD) tools can potentially reduce the number of incorrect interpretations of medical image data by radiologists. Datasets with adequate sample size, annotation, and truth are the dominant factors in developing and training effective CAD algorithms. The objective of this study was to produce a practical approach and a tool for the creation of medical image datasets.
The proposed model uses the modified maximum transverse diameter approach to mark a putative lung nodule. The modification involves the possibility to use a set of overlapping spheres of appropriate size to approximate the shape of the nodule. The algorithm embedded in the model also groups the marks made by different readers for the same lesion. We used the data of 536 randomly selected patients of Moscow outpatient clinics to create a dataset of standard-dose chest computed tomography (CT) scans utilizing the double-reading approach with arbitration.
Read More: https://www.selleckchem.com/products/cep-18770.html
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