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关键词： Location recommendation   Check-in   Hybrid method   Categorical hierarchy   Social correlation   Location popularity  

摘要： The primary aim of location recommendation is to predict users' future movement by modeling user preference. Multiple types of information have been adopted in profiling users;however, simultaneously combining them for a better recommendation is challenging. In this study, a novel location recommendation method that incorporates geographical, categorical, and social preferences with location popularity is proposed. Experimental results on two public datasets show that the proposed method significantly outperforms two state-of-the-art recommendation methods. Geographical preference generally shows more importance than both categorical and social preferences. A category hierarchy that unleashes the independent assumption of location tags improves categorical preference. Location popularity proves to be a useful metric in ranking candidate locations. The findings of this study can provide practical guidelines for location recommendation services.

关键词： 17B37   81R50 (primary)   57M25 (secondary)  

摘要： Letgbe a finite-dimensional complex semisimple Lie algebra. The finite-dimensional representations of the quantized enveloping algebraUq(g)form a braided monoidal categoryOint. We show that the category of finite-dimensional representations of a quantum symmetric pair coideal subalgebraBc,sofUq(g)is a braided module category over an equivariantizationOint⟨sigma⟩ofOint. The braiding forBc,sis realized by a universal K-matrix which lies in a completion ofBc,s circle times Uq(g). We apply these results to describe a distinguished basis of the center ofBc,s.

关键词： Category of relations   Cohomology   Frobenius algebra   Groupoid   Simplicial set   Topological quantum field theory  

摘要： We give a characterization, in terms of simplicial sets, of Frobenius objects in the category of relations. This result generalizes a result of Heunen, Contreras, and Cattaneo showing that special dagger Frobenius objects in the category of relations are in correspondence with groupoids. As an additional example, we construct a Frobenius object in the category of relations whose elements are certain cohomology classes in a compact oriented Riemannian manifold.

摘要： We prove a Hinich-type theorem on the existence of a model structure on a category related by adjunction to the category of differential graded modules over a graded commutative ring.

关键词： basal ganglia   category learning   inferior frontal gyrus   multimodal   multisensory  

摘要： Humans are able to categorize things they encounter in the world (e.g., a cat) by integrating multisensory information from the auditory and visual modalities with ease and speed. However, how the brain learns multisensory categories remains elusive. The present study used functional magnetic resonance imaging to investigate, for the first time, the neural mechanisms underpinning multisensory information-integration (II) category learning. A sensory-modality-general network, including the left insula, right inferior frontal gyrus (IFG), supplementary motor area, left precentral gyrus, bilateral parietal cortex, and right caudate and globus pallidus, was recruited for II categorization, regardless of whether the information came from a single modality or from multiple modalities. Putamen activity was higher in correct categorization than incorrect categorization. Critically, the left IFG and left body and tail of the caudate were activated in multisensory II categorization but not in unisensory II categorization, which suggests this network plays a specific role in integrating multisensory information during category learning. The present results extend our understanding of the role of the left IFG in multisensory processing from the linguistic domain to a broader role in audiovisual learning. © 2020 The Author(s) 2020. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: ***@***.

关键词： Fashion compatibility   Deep learning   Neural networks   Multimodal  

摘要： Fashion compatibility is a subjective sense of human for relationships between fashion items, which is essential for fashion recommendation. Recently, it increasingly attracts more and more attentions and has become a very hot research topic. Learning fashion compatibility is a challenging task, since it needs to consider plenty of factors about fashion items, such as color, texture, style and functionality. Unlike low-level visual compatibility (e.g., color, texture), high-level semantic compatibility (e.g., style, functionality) cannot be handled purely based on fashion images. In this paper, we propose a novel multimodal framework to learn fashion compatibility, which simultaneously integrates both semantic and visual embeddings into a unified deep learning model. For semantic embeddings, a multilayered Long Short-Term Memory (LSTM) is employed for discriminative semantic representation learning, while a deep Convolutional Neural Network (CNN) is used for visual embeddings. A fusion module is then constructed to combine semantic and visual information of fashion items, which equivalently transforms semantic and visual spaces into a latent feature space. Furthermore, a new triplet ranking loss with compatible weights is introduced to measure fine-grained relationships between fashion items, which is more consistent with human feelings on fashion compatibility in reality. Extensive experiments conducted on Amazon fashion dataset demonstrate the effectiveness of the proposed method for learning fashion compatibility, which outperforms the state-of-the-art approaches. (C) 2019 Elsevier B.V. All rights reserved.

关键词： Enriched infinity categories   Yoneda lemma  

摘要： We continue the study of enriched infinity-categories, using a definition equivalent to that of Gepner and Haugseng. In our approach enriched infinity-categories are associative monoids in an especially designed monoidal category of enriched quivers. We prove that, in the case where the monoidal structure in the basic category M comes from the direct product, our definition is essentially equivalent to the approach via Segal objects. Furthermore, we compare our notion with the notion of category left-tensored over M, and prove a version of Yoneda lemma in this context. We apply the Yoneda lemma to the study of correspondences of enriched (for instance, higher) infinity-categories. (C) 2020 Elsevier Inc. All rights reserved.

关键词： dyslipidemias   cardiovascular disease risk factors   guidelines   european society of cardiology  

关键词： ASD heterogeneity   Bayesian modeling   Behavioral deficits   Default mode network   Phenotypes   Resting-state functional connectivity  

摘要： BACKGROUND: Heterogeneity in autism spectrum disorder (ASD) has hindered the development of biomarkers, thus motivating subtyping efforts. Most subtyping studies divide individuals with ASD into nonoverlapping (categorical) subgroups. However, continuous interindividual variation in ASD suggests that there is a need for a dimensional approach. METHODS: A Bayesian model was employed to decompose resting-state functional connectivity (RSFC) of individuals with ASD into multiple abnormal RSFC patterns, i.e., categorical subtypes, henceforth referred to as "factors." Importantly, the model allowed each individual to express one or more factors to varying degrees (dimensional subtyping). The model was applied to 306 individuals with ASD (5.2-57 years of age) from two multisite repositories. Post hoc analyses associated factors with symptoms and demographics. RESULTS: Analyses yielded three factors with dissociable whole-brain hypo- and hyper-RSFC patterns. Most participants expressed multiple (categorical) factors, suggestive of a mosaic of subtypes within individuals. All factors shared abnormal RSFC involving the default mode network, but the directionality (hypo- or hyper-RSFC) differed across factors. Factor 1 was associated with core ASD symptoms. Factors 1 and 2 were associated with distinct comorbid symptoms. Older male participants preferentially expressed factor 3. Factors were robust across control analyses and were not associated with IQ or head motion. CONCLUSIONS: There exist at least three ASD factors with dissociable whole-brain RSFC patterns, behaviors, and demographics. Heterogeneous default mode network hypo- and hyper-RSFC across the factors might explain previously reported inconsistencies. The factors differentiated between core ASD and comorbid symptoms-a less appreciated domain of heterogeneity in ASD. These factors are coexpressed in individuals with ASD with different degrees, thus reconciling categorical and dimensional perspectives of ASD heter

关键词： 技术控制   类别   重要性  

摘要： 由于我国城市化的快速发展,建筑业得到了快速发展,并逐渐成为国民经济的重要组成部分。阐述了工程管理的范围,提出了发挥工程管理重要性的对策,以期为工程管理提供参考。