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The present research demonstrates multiple modes of closed-loop melt pool size control in laser-wire based DED , a form of large-scale metal additive manufacturing .
 concept or principle: research; material: melt pool; manufacturing process: DED; manufacturing process: metal additive manufacturing
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: research, melt pool, DED, metal additive manufacturing 
Answer:
 concept or principle: research; material: melt pool; manufacturing process: DED; manufacturing process: metal additive manufacturing