Abstract: A Visual Simultaneous Localization and Mapping (V-SLAM) system for a mobile host includes a camera for sensing and outputting image data indicative of features of interest in a surrounding environment of the host. A global navigation satellite system (GNSS) receiver determines a position of the host on a route as GNSS data. A controller localizes the mobile host on a route using the GNSS data and a semantic submap when a signal quality of the GNSS receiver exceeds a threshold. When the signal quality does not exceed the threshold, the controller selectively localizes the mobile host on the route at least in part using a crowdsourced three-dimensional (3D) point cloud map of the route. The V-SLAM system communicates the image data and the GNSS data to a cloud-based backend architecture operable for generating the crowdsourced 3D point cloud map of the route.

Abstract: A method of detecting and utilizing a 3-dimensional (3D) position of a coupler of a trailer may include calculating a motion of a camera mounted to a vehicle; determining 2-dimensional (2D) positions of the coupler within input images captured by the camera; estimating 3D estimated positions of the coupler based on the 2D positions of the coupler and the motion of the camera; optimizing the 3D estimated positions of the coupler to generate adjusted 3D coupler positions; and filtering the adjusted 3D coupler positions to detect the 3D position of the coupler of the trailer.

Abstract: A method for aligning a plurality of local maps with a global coordinate system includes quantifying a global navigation satellite system (GNSS) error at each of a plurality of locations within an environment. The method further includes determining a plurality of anchor points within the environment based at least in part on the GNSS error at each of the plurality of locations. The method further includes aligning the plurality of local maps with the global coordinate system based at least in part on the plurality of anchor points.

Abstract: Systems, devices, methods, and storage media for managing refreshment of memory cells in memory systems are provided. In one aspect, a memory system includes: a non-volatile memory device including a plurality of memory cells and a memory controller coupled to the non-volatile memory device. The memory controller is configured to: refresh adjacent memory cells of a target memory cell of the plurality of memory cells, when a count of write operations performed on the target memory cell within a preset time duration is greater than a preset threshold.

Abstract: The present disclosure relates to a method and a device for predicting ability of a temporary plugging agent to plug cracks and a storage medium, and includes the following steps: calculating a plane elastic modulus of a core through experiments, acquiring a maximum force load of a specimen, calculating rock fracture toughness through the maximum force load, manufacturing an artificial crack model and placing it in a core holder, preparing temporary plugging deflection fluid by selecting a temporary plugging agent, injecting the temporary plugging deflection fluid into the artificial crack so as to calculate apparent fracture toughness of the temporarily plugged crack, and finally calculating a fracture pressure of the temporarily plugged crack based on the calculated rock fracture toughness and the plane elastic modulus of the core. Through the above method, the present disclosure provides a standard fracture pressure calculation method.

Abstract: A method for correcting photoelectric logging measurements includes acquiring a photoelectric factor image including photoelectric factor measurements in at least first and second azimuthal sectors in a borehole. The photo electric factor image is processed using a system of equations to compute a photoelectric factor of a formation through which the borehole penetrates and photoelectric factor of the drilling fluid in the borehole.

Abstract: A tool box and a tool kit are provided. The tool box includes a box body and a cover body. A first side surface and a second side surface of the box body are provided with communicated openings, the box body is provided with a control component, each control component is provided with a first suction component. The cover body covers the opening, and is provided with a second suction component. When the cover body covers the opening, the corresponding second suction component and first suction component are sucked. The cover body is rotationally connected to the box body, the rotational connection part between the cover body and the box body is provided with an elastic component. When the control component is pressed or pushed, the corresponding second suction component and first suction component are separated, the elastic component bounces the cover body to open the box body.

Abstract: A system for fusing two or more versions of map data together includes one or more central computers that receive road network data representing a road network for a predefined geofenced area. The central computers receive road network data that includes a discrete random curve that represents lane markings. The discrete random curve includes a plurality of state vectors that are each defined by a respective location and tangent angle. The central computers estimate the position for the state vectors of the discrete random curve based on a signed distance and the tangent angle by minimizing a spatial Kalman filter cost function and execute a Kalman smoothening function to estimate the position and the tangent angle for the state vectors that are part of the discrete random curve, where the state vectors each represent a map point of the fused map data.