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For this purpose , a 3-factor , 3-level Design of Experiment ( DoE ) has been carried out to investigate melting pool size and roughness by changing the machine process parameters : laser power , hatch distance , time exposure .
 concept or principle: Design of Experiment; manufacturing process: melting; machanical property: roughness; machine or equipment: machine; concept or principle: parameters; process parameter: laser power; process parameter: hatch distance; concept or principle: exposure
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: Design of Experiment, melting, roughness, machine, parameters, laser power, hatch distance, exposure 
Answer:
 concept or principle: Design of Experiment; manufacturing process: melting; machanical property: roughness; machine or equipment: machine; concept or principle: parameters; process parameter: laser power; process parameter: hatch distance; concept or principle: exposure