['To', 'solve', 'knowledge', 'sharing', 'of', 'knowledge', 'Base', 'in', 'expert', 'system', ',', 'we', 'abstract', 'and', 'analyze', 'the', 'power', 'grid', 'security', 'investigation', 'procedure', 'by', 'using', 'ontology', 'Technology', '.']