IN an address on sleep and hypnosis delivered at a meeting of Section J (Psychology) of the British Association at Aberdeen, Dr. William Brown pointed out that although there are marked contrasts ...

Abstract: I welcome you to the fourth issue of the IEEE Communications Surveys and Tutorials in 2021. This issue includes 23 papers covering different aspects of communication networks. In particular, ...

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Abstract: Edge detection is one of the basic operations carried out in image processing and object identification. As it plays an important role in image processing which needs to be optimized, ...