I need a research paper about Natural Language Processing – a technology in Artificial Intelligence field. The paper should introduce about this technology, explain how it works, tell about history of this technology, list how many levels this technology have and explain each level, introduce some applications about the technology and go over them then go deeply into two specific applications: Sign Language Recognition and Translation; Chatbot. The paper should explain specifically how NLP applied to these two applications, how the applications work, etc.

I attached the Project Proposal which has the paper outline and some references.