Sensing...

Generally speaking heuristics aim to find a good enough solution to a problem in a reasonable amount of time. These are mostly based on experiences and common sense. Metaheutistics iteratively tries to improve a candidate solution with respect to a given measure of quality.They rarely make assumptions about the problem being optimized They can search very large spaces of candidate solutions. Whereas they do not guarantee the finding of an optimal solution. Some of the popularly used metaheuristics for optimization problems are: • Simulated Annealing (SA), • Particle Swarm Optimization (PSO), • Differential Evolution (DE), • Genetic Algorithm (GA), • Evolutionary Strategy (ES).

Two machines running a server and a client running respectively can be connected securely via ssh.  ssh user@serverIP example: ssh tom@203.159.11.42 Every time a user logs in to the server user have to provide password for getting into the server.Whereas passwordless authentication using the public key is considered more secure while loggin to a remote server. For that the following steps should be followed: 1. Generate public/private rsa key pair: ssh-keygen -t rsa When password is asked just hit a "ENTER" to leave it empty 2.Now use ssh to create a directory ~/.ssh as user (e.g. "tom") on server(e.g. 203.159.11.42). ssh tom@203.159.11.42 -p .ssh 3.Copy key to remote server cat .ssh/id_rsa.pub | ssh tom@203.159.11.42 'cat >> .ssh/authorized_keys' After finishing these three steps, login to the remote server with ssh will not require password.