id	keyword
american_scientific_journal-7249	pid
american_scientific_journal-7249	controller
american_scientific_journal-7249	quadrotor
american_scientific_journal-7249	engineering
american_scientific_journal-7249	journal
american_scientific_journal-7249	attitude
american_scientific_journal-7249	research
american_scientific_journal-7249	technology
american_scientific_journal-7249	time
american_scientific_journal-7249	sciences