417 research outputs found
Multi-task faster R-CNN for nighttime pedestrian detection and distance estimation
No full textArt. 103694Distance estimation and pedestrian detection are critical for safe driving operation decision-making and autonomous vehicle intelligent control strategies. This paper proposes a novel multi-task Faster R-CNN detector which simultaneously realizes distance estimation and pedestrian detection using an improved ResNet-50 architecture. Images were acquired using a near-infrared camera with two near-infrared fill-lights devices during real road nighttime scenarios. Ground truth pedestrian distances used for training were obtained using LIDAR. The data used to optimize the multi-task Faster R-CNN detector were approximately 20 k high-quality near-infrared images with marked pedestrians and tagged distance values. The proposed algorithm including the distance estimation runs at a speed exceeding 7 fps. Pedestrian detection accuracy reached nearly 80% with a total average absolute distance estimation error rate of less than 5%.11
Hu-Fu: A Data Federation System for Secure Spatial Queries
No full textThe increasing concerns on data security limit the sharing of data distributedly stored at multiple data owners and impede the scale of spatial queries over big urban data. In response, data federation systems have emerged to perform secure queries across multiple data owners leveraging secure multi-party computation. However, existing systems are designed for relational data. They are highly inefficient on spatial queries and limited in usability. In this demonstration, we introduce Hu-Fu, the first data federation system for secure spatial queries with high efficiency and usability. Hu-Fu is designed from the perspectives of the query user and the data owner for high usability and decomposes a spatial query into as many plaintext operators and as few secure operators as possible for high efficiency. We demonstrate the deployment and usage of Hu-Fu via cross-company taxi-calling, a popular smart city application.</p
Relationship Between Dyadic Coping with Anxiety and Depression in Infertile Couples: Gender Differences and Dyadic Interaction
No full textNan Tang,1,2,* Mengyue Pei,2,3,* Lei Xie,2,4 Xueping Liang,2 Junping Hu,2,5 Yuan Gao1 1Department of Nursing, 1th Medical Centre of PLA General Hospital, Beijing, People’s Republic of China; 2School of Nursing, Lanzhou University, Lanzhou, Gansu, People’s Republic of China; 3Henan Kaifeng College of Science Technology and Communication, Kaifei, Henan, People’s Republic of China; 4Renji Hospital, Shanghai Jiaotong University, Shanghai, People’s Republic of China; 5The First hospital of Lanzhou University, Lanzhou, Gansu, People’s Republic of China*These authors contributed equally to this workCorrespondence: Junping Hu; Yuan Gao, Email [email protected]; [email protected]: This study aims to examine the relationship between anxiety and depression and dyadic coping in infertile couples, exploring gender differences and dyadic interactions in these associations.Methods: A cross-sectional study was conducted involving 288 couples recruited from the First Affiliated Hospital of Lanzhou University between November 2021 and November 2022. The Dyadic Coping Scale, Anxiety Scale, and Depression Scale were utilized to measure dyadic coping, anxiety, and depression, respectively. The Actor-Partner Interdependence Model was used to analyze the actor effect and partner effect.Results: Wives exhibited significantly higher anxiety and depression scores compared to husbands (p< 0.001). No statistically significant difference was found in dyadic coping between wives and husbands. Positive dyadic coping in infertile couples had significant actor effects on anxiety and depression (p< 0.05) and partner effects (p< 0.05). Positive dyadic coping negatively predicted anxiety and depression of oneself and one’s partner. Negative dyadic coping in infertile couples also had significant actor effects on anxiety and depression (p< 0.05) and partner effects (p< 0.05). Negative dyadic coping positively predicted anxiety and depression of oneself and one’s partner.Conclusion: The dyadic coping style of infertile couples has both actor and partner effects on their own and their partner’s anxiety and depression. Anxiety and depression in infertile couples are influenced by their own and their partner’s dyadic coping style, respectively. Therefore, dyadic coping serves as an important indicator for predicting psychological outcomes in these couples.Keywords: infertility couple, dyadic coping, anxiety, depressio
Two‐order superconvergence for a weak Galerkin method on rectangular and cuboid grids
No full textThis is the peer reviewed version of the following article: Wang, J., Wang, X., Ye, X., Zhang, S., Zhu, P., Two-order superconvergence for a weak Galerkin method on rectangular and cuboid grids, Numer. Methods Partial Differ. Eq.. (2022), 1– 15. https://doi.org/10.1002/num.22918, which has been published in final form at https://doi.org/10.1002/num.22918. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited. This article will be embargoed until 09/22/2023.This article introduces a particular weak Galerkin (WG) element on rectangular/cuboid partitions that uses k th order polynomial for weak finite element functions and ( k + 1 ) th order polynomials for weak derivatives. This WG element is highly accurate with convergence two orders higher than the optimal order in an energy norm and the L 2 norm. The superconvergence is verified analytically and numerically. Furthermore, the usual stabilizer in the standard weak Galerkin formulation is no longer needed for this element.The research of Junping Wang was supported by the NSF IR/D program, while working at National Science Foundation. However, any opinion, finding, and conclusions or recommendations expressed in this material are those of the author and do not necessarily reflect the views of the National Science Foundation. This research was supported in part by National Science Foundation Grant DMS-1620016, Zhejiang Provincial Natural Science Foundation of China (LY19A010008), and National Natural Science Foundation of China (12071184)
Science Communication in Context of China: Reducing the Regional Imbalance
Full text linkScience communication is influenced by various factors of social context, such as politics, economy, culture and history, and these factors have different impact on science communication in different time and space domain. China is a country with appreciable regional diversity, where exist huge gap in economic, social, educational and science and technology development. The imbalance in development makes social context of science communication a prominent feature in the country. In China, the demand of citizens on science communication presents diversified and complex features, which were intensified by the leapfrog development of science communication pattern. Based upon above considerations, China is taking public science communication strategy in a localized way by government and the society as well. This paper discusses the functions which science communication played in reducing the regional imbalance in China
Preparation of high strain porous polyvinyl alcohol/polyaniline composite and its applications in all-solid-state supercapacitor
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Dynamic analysis of auger driller during luffing motion by bond graph
Full text linkTo investigate the inherent complex dynamic characteristics of luffing mechanism of auger driller, the rigid body motion of structures and the dynamic behavior of the drive system should be studied in an integrated model. The working principle and structural characteristics of the luffing mechanism is firstly analyzed, then the bond graph model of revolute joint, cylinder and boom are proposed based multi-body theory, and the bond graph model of hydraulic system is also constructed. Through the analysis of the dynamic characteristics and interaction rules of each sub model, the transmission path of power flow is described. Coupling the boom structure and hydraulic actuator, the complete bond graph model of luffing mechafnism have been developed in a unified way. The total governing equations of the system have been derived from the model. Numerical results of chamber pressure of luffing cylinder implies to the good accuracy of the bond graph study, while comparing with experimental results. Meanwhile, the effects of the installation position parameters of the joints on system response have been studied through simulation, which provides a theoretical basis for improving the dynamic performance of the luffing mechanism
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