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, ...

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Toby Walters is a financial writer, investor, and lifelong learner. He has a passion for ...

Matt Danielsson has 21+ years of writing experience and 7+ years as a financial advisor. He is the founder of Danielsson Enterprise. Anthony Battle is a CERTIFIED FINANCIAL PLANNER™ professional. He ...

Abstract: Gradient-based planners are widely used for quadrotor local planning, in which a Euclidean Signed Distance Field (ESDF) is crucial for evaluating gradient magnitude and direction.

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