1997
The second approach maps the density values obtained from non-penalized TO results onto the explicit predefined lattice structures with optional adaptation to improve the approximation accuracy of mechanical response .
 machanical property: density; engineering feature: lattice structures; process characterization: accuracy; concept or principle: mechanical response
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:
 machanical property: density; engineering feature: lattice structures; process characterization: accuracy; concept or principle: mechanical response