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Un sistema per la rappresentazione lessico-semantica di istruzioni in linguaggio naturale

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4 Figure 1-1: the semantic representation for “break” Fig. 1-1 shows two different syntactic frames for the verb break. The first one is called Basic Transitive and the second one Intransitive. In VERBNET the description in logic representing the meaning of the sentence is centered on events; here E. In the first frame the Agent is the cause of the event, the Patient is in contact with an instrument (that is unspecified in the sentence) for the duration of the event, and the consequence of the event is that the integrity of the patient has been degraded, and the physical form of the object is now determined by the form that typically this action implies (Form is a kind of built-in property that each verb in this class has to specify to determine which will be the form of the patient at the end of the action). In this syntactic frame the verb supports a transitive construction, which means the verb has a direct object. The proposed syntactic construction for this transitive frame (“Agent V Patient” in the figure) has the subject preceding the verb followed by an object. The second frame is called Intransitive: here the verb does not have an object, but only a subject. The preferred construction for such a syntactic frame (“Patient V” in the example) requires the subject to precede the verb. As you can see this example does say much more about this verb. It also says that in the transitive case the subject corresponds to the deep 1 semantic role (also called thematic role) of the agent and the object is mapped to the patient. Instead in the intransitive case the subject is mapped to the patient role. 1 Usually such roles are called “deep” to make a distinction between weak syntactic roles (like subject and object) that every verb has and semantic roles (like agent and patient) that only some verbs (like action verbs) have. % Basic Transitive (causative) $$ Agent V Patient cause(Agent,E) contact(during(E),?Instrument,Patient) degradation_material_integrity(result(E),Patient) physical_form(result(E),Form,Patient) % Intransitive (inchoative) $$ Patient V degradation_material_integrity(result(E),Patient) physical_form(result(E),Form,Patient)

Anteprima della Tesi di Elena Terenzi

Anteprima della tesi: Un sistema per la rappresentazione lessico-semantica di istruzioni in linguaggio naturale, Pagina 6

Tesi di Laurea

Facoltà: Ingegneria

Autore: Elena Terenzi Contatta »

Composta da 111 pagine.

 

Questa tesi ha raggiunto 2010 click dal 20/03/2004.

Disponibile in PDF, la consultazione è esclusivamente in formato digitale.