不确定时态信息表示的统一模型

Unified model for uncertain temporal information representation

时态信息表示和推理是人工智能研究中的一个重要课题,现有的模型大多只能表示确定时态信息,然而现实生活中很多事件的发生结束等时态信息都是不确定的。故提出了一个表示不确定时态信息的统一模型,可用于描述各种具有确定或不确定时态信息的事件。该模型首先定义各类时态对象(如时间点、时间区间)以及它们之间的关系,并给出时态对象间的传递关系表,利用该表能进行时态一致性约束满足问题的求解。最后,给出了两个不确定时态推理的例子,表明了该模型的实际应用意义。

Temporal representation and reasoning is a main research topic in artificial intelligence. Most common models can only represent certain temporal information, but many events happen with uncertain temporal information in real life. A new model for representing uncertain and certain temporal information was proposed to describe events and facts with time indeterminacy. This model firstly defined some temporal objects (such as time point and time period), then defined several relations among temporal objects and discussed the transitivity between the relations. Finally, two examples were analyzed, using this model to solve the uncertain temporal reasoning problem.