This 2-volume set constitutes the post-conference proceedings of the 4th International Conference on Cognitive Computing and Cyber Physical Systems, IC4S 2023, held in Bhimavaram, Andhra Pradesh, India, during August 4-6, 2023. The theme of IC4S 2023 was: cognitive approaches with machine learning and advanced communications. *

• The 70 full papers were carefully reviewed and selected from 165 submissions. The papers are clustered in thematical issues as follows: machine learning and its applications; cyber security and signal processing; image processing; smart power systems; smart city eco-system and communications.

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  Smart Power Systems.- Performance Evaluation of Off Grid Hybrid Distribution system with ANFIS controller.- Full Swing Logic Based Full Adder for Low Power Applications.- Single-phase Grid and Solar PV Integration with 15-level asymmetrical multilevel inverter.- A Review on Controlling charging process and discharging of Electric Vehicles in the Distribution Grid.- Area Efficient and Ultra Low Power Full Adder Design based on GDI Technique for Computing Systems.- Area Efficient and Ultra Low Power Full Adder Design based on GDI Technique for Computing Systems.- IOT-Based Hi-Tech Battery Charger for Modern EVs.- Comparative Analysis of PWM methods for Three Level Neutral Point Clamped Inverter.- Smart City Eco-system and Communications.- Single use Plastic Bottle recognition and classification using YOLO V5 and V8 architectures.- Model Predictive Controller (MPC) and Proportional Integral Derivative Control (PID) for Autonomous Lane Keeping Maneuvers: A Comparative Study of Their Efficacy and Stability.- Performance evaluation of DSR, AODV and MP-OLSR Routing Protocols using NS-2 Simulator in MANETs.- Efficient Fuel Delivery at Your Fingertips: Developing a Seamless On-Demand Fuel Delivery App with Flutter.- An IoT application based Decentralized Electronic Voting System Using Blockchain.- NeuroRobo: Bridging the Emotional Gap in Human-Robot Interaction with Facial Sentiment Analysis, Object Detection, and Behavior Prediction.- Equalization Based Soft Output Data Detection for Massive MU-MIMO-OFDM Using Coordinate Descent.- Performance Analysis of Hybrid BPSK-MPPM Modulated Multicore Fiber Interconnect System.- Performance Evaluation of Optical Links: With and Without Forward Error Correcting Codes.- Investigation of Highly Sensitive and Linearly Responsive SAW based Gas Sensor for Better N2 Detection.- Turnstile Diamond Dipole Nanoantenna based Smart City Compatible Thin Film Solar Cell.- Efficient Quality Factor Prediction of Artificial Neural Network Based IsOWC System.- Tunable UWB Metasurface Absorber for Smart City Compatible IoT Applications.- Optimal Time Splitting in Wireless Energy Harvesting-Enabled Sensor Networks.- Design and Parametric Study of Monopole Blade Antenna for UHF-Band Aerospace Applications.- Transmission Losses Due to Surface Reflections in Deep Water for Multipath Model.- Performance Evaluation of Multicast Routing Protocols in Mobile Ad Hoc Networks.- Analysis of Acoustic Channel Characteristics in Shallow Water Based on Multipath Model.- Development of Cost-Effective Water Quality Monitoring for Potable Drinking Water using IoT.- Smart IV Bag Monitoring System for Effective Monitoring of Patients.- Automatic Safety and Monitoring System using ESP8266 with cloud platform.- Comparison of Acoustic Channel Characteristics for Direct and Multipath Models in Shallow and Deep Water.- Clustering Based Hybrid Optimized Model for effective data transmission.- A Web-Based Vaccine Distribution System for Covid-19 using Vaxallot.