n

The number of dead nodes

D

The diameter of network

P

The initial transmission power

λ
_{1}

The density of leaders

λ
_{2}

The density of nonleaders

k

The number of regions that partitioned by Voronoi

N
_{
u
}

The number of neighbors of node u

k
_{
opt
}

The number of optimal regions

p

The probability that a node successfully is elected as a leader

L

The sum of the distance between nonleaders and leaders

N

The number of nonleaders in the region

d

The average distances between nonleaders and leaders
