id	keyword
american_scientific_journal-4051	light
american_scientific_journal-4051	communication
american_scientific_journal-4051	voice
american_scientific_journal-4051	signal
american_scientific_journal-4051	circuit
american_scientific_journal-4051	transmission
american_scientific_journal-4051	modulation
american_scientific_journal-4051	technology
american_scientific_journal-4051	system