9158
This paper presents a method that enables in the optimization of a multifunctional part by coupling both the system and structural design aspects .
 concept or principle: optimization; engineering feature: structural design
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: optimization, structural design 
Answer:
 concept or principle: optimization; engineering feature: structural design