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More recently , a new constraint function of the domain which controls the negative impact of porosity on elastic structures in the framework of shape and topology optimization is defined as a special shape derivative and proposed to embed into a level set TO process for AM lightweight design .
 concept or principle: domain; concept or principle: impact; machanical property: porosity; machanical property: elastic structures; concept or principle: framework; engineering feature: topology optimization; material: as; application: set; concept or principle: process; manufacturing process: AM; engineering feature: design
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: domain; concept or principle: impact; machanical property: porosity; machanical property: elastic structures; concept or principle: framework; engineering feature: topology optimization; material: as; application: set; concept or principle: process; manufacturing process: AM; engineering feature: design