This book explores various challenging problems and applications areas of wireless sensor networks (WSNs), and identifies the current issues and future research challenges.

Introduction on Wireless Sensor Networks Issues and Challenges in Current Era.- Intelligent applications of WSN in the world: A Technological and Literary Background.- Medium Access Control Protocols For Wireless Sensor Networks.- Performance of Distance and Energy based modified threshold LEACH.- Medium Access Control Protocols for Mission Critical Wireless Sensor Networks.- QoS Routing for Data Gathering with RPL in WSNs.- An Effective Analysis and Performance Investigation of Energy Heterogeneity in Wireless Sensor Networks.- A Firefly Optimization for Maximizing the connectivity in Wireless Sensor Network.- Resource Security Monitoring System in Wireless Industrial Internet of Things.- Syloc: Hybrid Key Generation In Sensor Network.- Diffie-Hellman Algorithm Pedestal to Authenticate Nodes in Wireless Sensor Network.- Privacy Aware prevention of Sybil Attack in Vehicular Ad Hoc Networks.- Key Management Schemes in Internet of Things: A Matrix Approach.- Black Hole Attack and Its Security Measure in Wireless Sensors Networks.- Detection and Tracking of Mobile Intruder in Harsh Geographical Terrains using Surveillance Wireless Sensor Networks.- Opportunities and Challenges with WSN's in Smart Technologies: A smart Agriculture Perspective.- Application of Supervised Learning Approach for Target Localization in Wireless Sensor Network.- A Review on Hybrid WSN-NGPON2 Network for Smart World.- Internet of Things in Forensics Investigation in Comparison to Digital Forensics.- A Review on The Artificial Intelligence Algorithms for The Recognition of Activities of Daily Living Using Sensors in Mobile Devices.