Both weakly meshed network and nodes programming are not dealt with distinguishingly in this algorithm.

A new three phase back/forward sweep power flow calculation for the weakly meshed distribution network with the distributed generation was presented.

An algorithm of real time load flow for three phase unbalanced system in complicated distribution system, with high R/X ratio, radial or weakly looped structure and PV nodes is presented in this paper.

In some case, single network vulnerability may be safe, or in some single act does not constitute a threat, but in the complex network connection, the attackers can make use of network-related vulnerabilities to exploit, and gradually improve their own power, and ultimately achieve the purpose of controlling objectives the machine or service.

The model collects the network vulnerability, analyzes the vulnerability relation, references network configuration and topology, simulates the produce of the exploitation state change, builds exploit graph, analyzes the key exploit queue and constructs assessment of network vulnerability, which provides a useful evidence and guidance for making risk decision.

The method identifies the correlation graphs to be integrated through alert relativity, and reasons out missing alerts by analyzing network vulnerability and exploit.

Taking Songliao Plain as an example, the proposition that strong stress makes a fragile environment into catastrophe is demonstrated for the first time.

Based on lots of data, from the view of environment and hydrology, this paper analyzes the hydrologic effect of the woods system, and demonstrates the necessity, probability and availability of the green project in the plain under the condition of fragile environment, then gives a way for implementation and puts forward problems.

This paperapplied the basic theory and method of landscape ecology to analyze the landscape pattern of fragile environment in this area.