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Raphael Tsu is a Fellow of the American Physical Society and currently serves as a Distinguished Professor of electrical engineering at the University of North Carolina at Charlotte , Charlotte , NC .
 Raphael Tsu, American Physical Society, University of North Carolina at Charlotte, Charlotte
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Raphael Tsu, American Physical Society, University of North Carolina at Charlotte, Charlotte