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Mostrando 661 - 680 Resultados de 1,151 Para Buscar '"dirichlet"', tiempo de consulta: 0.66s Limitar resultados
  1. 661
    “…Our approach first calculates the reputation of users by using the Dirichlet probability distribution, so as to identify untrusted users and process their unreliable data, and then it digs out the geographic neighborhood in three levels to improve the similarity calculation of users and services. …”
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    A Personalized QoS Prediction Approach for CPS Service Recommendation Based on Reputation and Location-Aware Collaborative Filtering
  2. 662
    por Onan, Aytuğ
    Publicado 2018
    “…In this paper, we propose an efficient multiple classifier approach to text categorization based on swarm-optimized topic modelling. The Latent Dirichlet allocation (LDA) can overcome the high dimensionality problem of vector space model, but identifying appropriate parameter values is critical to performance of LDA. …”
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    Biomedical Text Categorization Based on Ensemble Pruning and Optimized Topic Modelling
  3. 663
    “…Therefore, this paper analyzes the processes and mechanisms associated with the evolution of the commercial spatial structure in Guangzhou after the financial crisis in 2008 based on both theoretical and empirical analyses. We use a Dirichlet multinomial regression (DMR) model to extract latent semantic information and determine urban functional areas from global positioning system (GPS) and point-of-interest (POI) data collected in Guangzhou in 2009 and 2013. …”
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    Detecting urban commercial patterns using a latent semantic information model: A case study of spatial-temporal evolution in Guangzhou, China
  4. 664
    por Sui, Xiuchao, Rajapakse, Jagath C.
    Publicado 2018
    “…Although white matter (WM) impairment also contributes to AD pathology, its heterogeneity remains unclear. The Latent Dirichlet Allocation (LDA) method is a suitable framework to study heterogeneity and allows to identify latent impairment factors of AD instead of simply mapping an overall disease effect. …”
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    Profiling heterogeneity of Alzheimer's disease using white-matter impairment factors
  5. 665
    por Tang, Niansheng, Wang, Songjian, Ye, Gen
    Publicado 2018
    “…METHODS: This paper relaxes the parametric assumption of dose-toxicity relationship by imposing a Dirichlet process prior on unknown dose-toxicity curve. …”
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    A nonparametric Bayesian continual reassessment method in single-agent dose-finding studies
  6. 666
    “…A novel analysis approach that combined bibliometrics analysis with a more complex analysis of abstract content using exploratory factor analysis and Latent Dirichlet allocation, which uncovered emerging research domains and topics, was adopted. …”
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    The Current Research Landscape of the Application of Artificial Intelligence in Managing Cerebrovascular and Heart Diseases: A Bibliometric and Content Analysis
  7. 667
    “…RESULTS: We implemented a Dirichlet Process Heterogeneous Mixture model that infers Gaussian, Bernoulli and Poisson distributions over features. …”
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    Variational infinite heterogeneous mixture model for semi-supervised clustering of heart enhancers
  8. 668
    “…In this paper, we propose and apply a new regression model combining the Dirichlet-multinomial distribution with recursive partitioning providing a fully non-parametric regression model. …”
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    New statistical method identifies cytokines that distinguish stool microbiomes
  9. 669
    “…Bibliometrics analysis was combined with exploratory factor analysis and latent Dirichlet allocation to uncover emergent research domains and topics related to artificial intelligence and diabetes. …”
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    Modeling the Research Landscapes of Artificial Intelligence Applications in Diabetes (GAP(RESEARCH))
  10. 670
    “…In this study, we develop a pipeline that integrates dimensionality reduction and statistical modeling to grapple with the heterogeneity. LDA(Latent Dirichlet allocation)-link connects microbes to genes using reduced-dimensionality LDA topics. …”
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    Approaches for integrating heterogeneous RNA-seq data reveal cross-talk between microbes and genes in asthmatic patients
  11. 671
    “…We investigate these questions by using Latent Dirichlet Analysis to compare the topical diversity of papers published by synthesis center collaborations with that of papers in a reference corpus. …”
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    Do synthesis centers synthesize? A semantic analysis of topical diversity in research
  12. 672
    “…Here we reviewed literature from Web of Science database searches of 12 epithets to learn (Objective 1—O1) if epithet topics are consistent across Web of Science categories using latent Dirichlet allocation topic modeling. We also analyzed publication rates and topics over time to (O2) assess changes in epithet use. …”
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    What’s in a Name? Patterns, Trends, and Suggestions for Defining Non-Perennial Rivers and Streams
  13. 673
    “…Our prior distribution for the allelic series is based on the Chinese restaurant process, a relative of the Dirichlet process, and we leverage its connection to the coalescent to introduce additional prior information about haplotype relatedness via a phylogenetic tree. …”
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    Inferring the Allelic Series at QTL in Multiparental Populations
  14. 674
    por Ning, Li, Lifang, Peng, Huixin, He
    Publicado 2020
    “…We use a topic analysis tool, Latent Dirichlet Allocation, to extract themes as a probabilistic distribution of latent topics from literature dataset. …”
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    Prediction Correction Topic Evolution Research for Metabolic Pathways of the Gut Microbiota
  15. 675
    por Hou, Keke, Hou, Tingting, Cai, Lili
    Publicado 2021
    “…Significant positive correlation between public attention level and COVID-19 related cases number was identified. Based on Latent Dirichlet Allocation model, topic extraction was implemented in different stages and 41 topics were identified totally. …”
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    Public attention about COVID-19 on social media: An investigation based on data mining and text analysis
  16. 676
    “…We prove this by deriving an achievability bound, obtained by relating the corresponding optimization problem to the lowest Dirichlet eigenvalue of the Laplacian on the ordered simplex. …”
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    Asymptotic Performance of Port-Based Teleportation
  17. 677
    “…The corresponding reaction diffusion system with Dirichlet boundary condition has been considered and the Turing instability has been studied. …”
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    Stability and bifurcation analysis of a heroin model with diffusion, delay and nonlinear incidence rate
  18. 678
    “…By adopting the Latent Dirichlet Allocation (LDA) model, this paper allocates the research articles into 50 key research topics pertinent to COVID-19 according to their abstracts. …”
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    Tracing the Pace of COVID-19 Research: Topic Modeling and Evolution
  19. 679
    “…Free text responses and their topics were modelled using natural language processing and a latent Dirichlet model. Results: We received a total of 723 responses; of these, 69% had downloaded the app and 31% had not. …”
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    The barriers and enablers to downloading the COVIDSafe app – a topic modelling analysis
  20. 680
    por Deng, Wen, Yang, Yi
    Publicado 2021
    “…Then, we use a topic modeling technique, Latent Dirichlet Allocation (LDA), to identify the most common issues posted by users and temporal analysis to research the issue’s trend. …”
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    Cross-Platform Comparative Study of Public Concern on Social Media during the COVID-19 Pandemic: An Empirical Study Based on Twitter and Weibo
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