scholarly journals Bayesian spatiotemporal modeling with sliding windows to correct reporting delays for real-time dengue surveillance in Thailand

Author(s):  
Chawarat Rotejanaprasert ◽  
Nattwut Ekapirat ◽  
Darin Areechokchai ◽  
Richard J. Maude
Author(s):  
Wu Shanshan ◽  
Yu Ge ◽  
Yu Yaxin ◽  
Ou Zhengyu ◽  
Yang Xinhua ◽  
...  

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Kai Zhang ◽  
Xiaohu Zhao ◽  
Xiao Li ◽  
XingYi You ◽  
Yonghong Zhu

Accurate and real-time network traffic flow forecast holds an important role for network management. Especially at present, virtual reality (VR), artificial intelligence (AI), vehicle-to-everything (V2X), and other technologies are closely combined through the mobile network, which greatly increases the human-computer interaction activities. At the same time, it requires high-throughput, low delay, and high reliable service guarantee. In order to achieve ondemand real-time high-quality network service, we must accurately grasp the dynamic changes of network traffic. However, due to the increase of client mobility and application behavior diversity, the complexity and dynamics of network traffic in the temporal domain and the spatial domain increase sharply. To accurate capture the spatiotemporal features, we propose the spatial-temporal graph convolution gated recurrent unit (GC-GRU) model, which integrates the graph convolutional network (GCN) and the gated recurrent unit (GRU) together. In this model, the GCN structure could handle the spatial features of traffic flow with network topology, and the GRU is used to further process spatiotemporal features. Experiments show that the GC-GRU model has better prediction performance than other baseline models and can obtain spatial-temporal correlation in traffic lows better.


2021 ◽  
pp. 107561
Author(s):  
Zhongliang Yang ◽  
Hao Yang ◽  
Ching-Chun Chang ◽  
Yongfeng Huang ◽  
Chin-Chen Chang

Author(s):  
Melanie H. Chitwood ◽  
Marcus Russi ◽  
Kenneth Gunasekera ◽  
Joshua Havumaki ◽  
Virginia E. Pitzer ◽  
...  

AbstractReal-time estimates of the true size and trajectory of local COVID-19 epidemics are key metrics to guide policy responses. We developed a Bayesian nowcasting approach that explicitly accounts for reporting delays and secular changes in case ascertainment to generate real-time estimates of COVID-19 epidemiology on the basis of reported cases and deaths. Using this approach, we estimate time trends in infections, symptomatic cases, and deaths for all 50 US states and the District of Columbia from early-March through June 11, 2020. At the beginning of June, our best estimates of the effective reproduction number (Rt) are close to 1 in most states, indicating a stabilization of incidence, but there is considerable variability in the level of incidence and the estimated proportion of the population that has already been infected.One Sentence SummaryA new method to track epidemiologic measures of COVID-19, available in the covidestim package for R.


Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4758
Author(s):  
Jen-Kai Tsai ◽  
Chen-Chien Hsu ◽  
Wei-Yen Wang ◽  
Shao-Kang Huang

Action recognition has gained great attention in automatic video analysis, greatly reducing the cost of human resources for smart surveillance. Most methods, however, focus on the detection of only one action event for a single person in a well-segmented video, rather than the recognition of multiple actions performed by more than one person at the same time for an untrimmed video. In this paper, we propose a deep learning-based multiple-person action recognition system for use in various real-time smart surveillance applications. By capturing a video stream of the scene, the proposed system can detect and track multiple people appearing in the scene and subsequently recognize their actions. Thanks to high resolution of the video frames, we establish a zoom-in function to obtain more satisfactory action recognition results when people in the scene become too far from the camera. To further improve the accuracy, recognition results from inflated 3D ConvNet (I3D) with multiple sliding windows are processed by a nonmaximum suppression (NMS) approach to obtain a more robust decision. Experimental results show that the proposed method can perform multiple-person action recognition in real time suitable for applications such as long-term care environments.


2004 ◽  
Vol 74 (7) ◽  
pp. 646-651 ◽  
Author(s):  
C. Anagnostopoulos ◽  
I. Anagnostopoulos ◽  
D. Vergados ◽  
E. Kayafas ◽  
V. Loumos
Keyword(s):  

Robotica ◽  
2015 ◽  
Vol 35 (1) ◽  
pp. 85-100
Author(s):  
Caio César Teodoro Mendes ◽  
Fernando Santos Osório ◽  
Denis Fernando Wolf

SUMMARYAn efficient obstacle detection technique is required so that navigating robots can avoid obstacles and potential hazards. This task is usually simplified by relying on structural patterns. However, obstacle detection constitutes a challenging problem in unstructured unknown environments, where such patterns may not exist. Talukder et al. (2002, IEEE Intelligent Vehicles Symposium, pp. 610–618.) successfully derived a method to deal with such environments. Nevertheless, the method has a high computational cost and researchers that employ it usually rely on approximations to achieve real-time. We hypothesize that by using a graphics processing unit (GPU), the computing time of the method can be significantly reduced. Throughout the implementation process, we developed a general framework for processing dynamically-sized sliding windows on a GPU. The framework can be applied to other problems that require similar computation. Experiments were performed with a stereo camera and an RGB-D sensor, where the GPU implementations were compared to multi-core and single-core CPU implementations. The results show a significant gain in the computational performance, i.e. in a particular instance, a GPU implementation is almost 90 times faster than a single-core one.


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