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Autonomous driving heavily relies on LiDAR and camera sensors, which can significantly improve the performance of perception and navigation tasks when fused together. The success of this cross-modality fusion hinges on accurate extrinsic calibration. In recent years, targetless LiDAR-camera calibration methods have gained increasing attention thanks to their independence from external targets. Nevertheless, developing a targetless method for low-resolution LiDARs still remains challenging due to the difficulty in extracting reliable features from point clouds with limited LiDAR beams. In this paper, we propose a robust targetless method to solve this struggling problem. It can automatically estimate accurate Li-DAR and camera poses and solve the extrinsic matrix through hand-eye calibration. Moreover, we also carefully analyze pose estimation issues existing in the low-resolution LiDAR and present our solution. Real-world experiments are carried out on a UGV-mounted multi-sensor platform containing a CCD camera and a VLP-16 LiDAR. For evaluation, we use a state-of-the-art target-based calibration approach to generate the ground-truth extrinsic parameters. Experimental results demonstrate that our method outperforms a couple of advanced targetless calibration studies in both translation and rotation errors.

On May 31, 2021, the Three-child Policy was put forward officially in China. It is obvious that it will impose some effects on women. The aim of this paper is to find out these effects, especially in the workplace, and the ways to solve them. This research can help provide some helpful supporting measures for this policy. An in-depth interview methodology is applied in this paper. The research found that women faced greater working pressure in the workplace because of the Three-child Policy. In our interview, eight ninths of interviewers thought they will face great working pressure in the workplace in the future because of the Threechild Policy or they had experienced the great working pressure in the workplace. For example, they may be discriminated by their employers because of this policy.

In this case report, we describe a patient who was first diagnosed with Miller Fisher syndrome (MFS) combined with myasthenia gravis (MG). A 58-year-old male patient presented with acute dysarthria with dizziness, ophthalmoplegia, absence of deep tendon reflexes in the extremities, and ataxia. Lumbar puncture 1 week after onset showed albuminocytologic dissociation and serum antibodies against GQ1b and GT1a turned out to be positive. Ultimately, the patient was diagnosed with MFS, which is a rare variant of Guillain-Barre syndrome. Because the clinical manifestations of the patient could not exclude MG, electromyography, and serum muscle weakness antibody profile were performed. The results showed positive for axillary nerve repetitive electrical stimulation and antibodies against acetylcholine receptor (AChR) and titin were detected, so the patient was diagnosed with MG at the same time. Even though only five cases of overlapping MFS and MG so far have been described, two different autoimmune diseases may coexist. When one disease presents with uncommon symptoms, careful identification of the presence or absence of other comorbid diseases should be required.