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In addition to his work in microcomputer systems and color graphics , Dr. Melen has made significant technical contributions to the development of CCD image sensors , ultrasonic imaging systems , implantable cochlear devices , image processing technology , and vehicular information systems .
 Melen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Melen