Coupled Integral Equation Technique (CIET) is presented for the study of propagation characteristics of circular waveguide periodically loaded with dielectric disks operating in TM01δ mode. CIET is a combination of Mode Matching Technique (MMT) and Method of Moments. The results are presented for three materials having different dielectric constants and compared with 3D simulation tool CST Studio in terms of simulation time and accuracy.

Inspired by recent advances in vision transformers for object detection, we propose Li3DeTr, an end-to-end LiDAR based 3D Detection Transformer for autonomous driving, that inputs LiDAR point clouds and regresses 3D bounding boxes. The LiDAR local and global features are encoded using sparse convolution and multi-scale deformable attention respectively. In the decoder head, firstly, in the novel Li3DeTr cross-attention block, we link the LiDAR global features to 3D predictions leveraging the sparse set of object queries learnt from the data. Secondly, the object query interactions are formulated using multi-head self-attention. Finally, the decoder layer is repeated L dec number of times to refine the object queries. Inspired by DETR, we employ set-to-set loss to train the Li3DeTr network. Without bells and whistles, the Li3DeTr network achieves 61.3% mAP and 67.6% NDS surpassing the state-of-the-art methods with non-maximum suppression (NMS) on the nuScenes dataset and it also achieves competitive performance on the KITTI dataset. We also employ knowledge distillation (KD) using a teacher and student model that slightly improves the performance of our network.

The research on autonomous vehicles has grown increasingly with the advent of neural networks. Dynamic obstacle detection is a fundamental step for self-driving vehicles in traffic environments. This paper presents a comparison of state-of-art object detection techniques like Faster R-CNN, YOLO and SSD with 2D image data. The algorithms for detection in driving, must be reliable, robust and should have a real time performance. The three methods are trained and tested on PASCAL VOC 2007 and 2012 datasets and both qualitative and quantitative results are presented. SSD model can be seen as a trade-off for speed and small object detection. A novel method for object detection using 3D data (RGB and depth) is proposed. The proposed model incorporates two stage architecture modality for RGB and depth processing and later fused hierarchically. The model will be trained and tested on RGB-D dataset in the future.

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