  Although artificial intelligence is currently one of the most interesting
areas in scientific research, the potential threats posed by emerging AI
systems remain a source of persistent controversy. To address the issue of AI
threat, this study proposes a standard intelligence model that unifies AI and
human characteristics in terms of four aspects of knowledge, i.e., input,
output, mastery, and creation. Using this model, we observe three challenges,
namely, expanding of the von Neumann architecture; testing and ranking the
intelligence quotient of naturally and artificially intelligent systems,
including humans, Google, Bing, Baidu, and Siri; and finally, the dividing of
artificially intelligent systems into seven grades from robots to Google Brain.
Based on this, we conclude that AlphaGo belongs to the third grade.
