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Recently , Wu have presented a computationally more efficient extension to their work that is using a simultaneous optimization of the shape and the distribution of the lattice , demonstrating a twofold increase in buckling load over the equivalent TO-solution .
 concept or principle: optimization; concept or principle: distribution; concept or principle: lattice; process characterization: buckling load
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: optimization; concept or principle: distribution; concept or principle: lattice; process characterization: buckling load