you are likely to find People in/at/on Hospital. Hospital is related to Establishment. 
School is a type of Organization. you are likely to find Computer in/at/on School. Computer can be used for Communication. Channel is a type of Communication. 
People --AtLocation--> Hospital <--RelatedTo--> Establishment 
Organization <--IsA-- School <--AtLocation-- Computer --UsedFor--> Communication <--IsA-- Channel 