Railway Engineering Research Institute, China Academy of Railway Sciences Co., Ltd.

China Academy of Railway Sciences Co., Ltd.

Beijing University of Posts and Telecommunications

Railway Construction Research Institute, China Academy of Railway Science Group Co., Ltd.

Jiawei Fan

Jian Li

Bo Liu

Jian Cui

Yufang Zhang

Kun Yuan

Xu Gao

Guozhuang Song

Zhenhua Yin

Wenjiao Zhou

Lei Zhang

Zehua Dong

Tao Jia

Yong Yao

Yu Cheng

Zhongmin Yang

Mengjia Liu

Pan Chen

Junli Wan

Xiaobing Li

Gongming Chen

Tao Wei

Wenxin Tan

Ning Xuan

Junjie Zeng

Zhongming Yang

Mingchang Hei

Zheyuan Xing

Fei Xian

Yunni Yang

Zhonghong Ou

Xiaoyang Kang

Junwei Yang

Xie Yu

Wenchao Zhang

Lining Du

Shuangquan Lei

Shiwen Huang

Hao Lan

Meina Song

Shengyong Zeng

A few-shot object detection method includes: sending a weight of a backbone network and a weight of a feature pyramid to a detection network; generating candidate regions, in which the candidate regions derived from a result of foreground-and-background classification and regression of output features of the visual representation backbone network by a region proposal network; generating candidate region features of a uniform size using a pooling operator based on the candidate regions, and performing location regression, content classification and fine-grained feature mining on the candidate region features of the uniform size; establishing fine-grained positive sample pairs and negative sample pairs through the fine-grained feature mining, and performing comparative learning between fine-grained features of the candidate regions; and generating a loss function according to a strategy in fine-grained feature mining, and updating detection network parameters by calculating based on the loss function.

Few-shot object detection method

Embodiments of the present disclosure provide a physical test system of large-scale three-dimensional multi-functional landslide-prevention and control structure. The system comprises a model test tank, a bidirectional servo loading system, a multi-scale model transformation system, a sliding surface evolution visualization system, a positive pressure monitoring system, an artificial rainfall system, and a control system. The bidirectional servo loading system applies a horizontal load and a vertical load, and the multi-scale model transformation system includes a plurality of retractable counterforce brackets, configured to change a width of the model test tank; and the sliding surface evolution visualization system includes a plurality of filming devices, configured to record a whole evolution process of a landslide sliding surface evolution.

Physical test systems of large-scale three-dimensional multi-functional landslide-prevention and control structure

A pile-net flexible cable barrier structure includes a first V-shaped pile, a second V-shaped pile, a left tension pile, a right tension pile, a first flexible cable net disposed between the left tension pile and the first V-shaped pile, a second flexible cable net disposed between the first V-shaped pile and the second V-shaped pile, and a third flexible cable net disposed between the second V-shaped pile and the right tension pile. A second pile body of the first V-shaped pile are disposed parallel to a third pile body of the second V-shaped pile, openings of the first V-shaped pile and the second V-shaped pile face a same side, the left tension pile are disposed parallel to the first pile body of the first V-shaped pile, and the right tension pile are disposed parallel to the fourth pile body of the second V-shaped pile.

Pile-net flexible cable barrier structure and construction method thereof

Provided are a system and a method for impact testing and monitoring of a high-energy flexible net. The system includes a vertical impact testing unit, a slope impact testing unit, an impact simulation unit, and an impact monitoring unit. The vertical impact testing unit includes a vertically positioned gravity wall. The slope impact testing unit includes a wall slope positioned perpendicularly to a second side of the gravity wall. A first side of the gravity wall and a slope surface of the wall slope are securely provided with a flexible net, respectively. The impact simulation unit includes an impact assembly and a lifting assembly. The impact monitoring unit is configured to monitor a deformation result and an internal force change result of the flexible net.

Systems and methods for impact testing and monitoring of high-energy flexible nets

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Beijing, China

Jiawei Fan