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Laser energy density ( LED ) , a method of correlating the effects of scan speed and beam power into one characteristic process parameter , was also investigated .
 process parameter: Laser energy density; application: LED; process parameter: scan speed; machine or equipment: beam; concept or principle: process parameter
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: Laser energy density, LED, scan speed, beam, process parameter 
Answer:
 process parameter: Laser energy density; application: LED; process parameter: scan speed; machine or equipment: beam; concept or principle: process parameter