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Here , the standard penalization factor was introduced for the material interpolation and to ensure convergence , however , for the FEA several critical nodes were assigned to local displacement functions based on the individual virtual loads to fine-tune the topology for a specific load case .
 concept or principle: standard; concept or principle: material interpolation; concept or principle: displacement functions; concept or principle: topology
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 concept or principle: standard; concept or principle: material interpolation; concept or principle: displacement functions; concept or principle: topology