This paper presents the semantic analysis of queries written in natural language (French) and dedicated to the object oriented data bases. The studied queries include one or two nominal groups (NG) articulating around...This paper presents the semantic analysis of queries written in natural language (French) and dedicated to the object oriented data bases. The studied queries include one or two nominal groups (NG) articulating around a verb. A NG consists of one or several keywords (application dependent noun or value). Simple semantic filters are defined for identifying these keywords which can be of semantic value: class, simple attribute, composed attribute, key value or not key value. Coherence rules and coherence constraints are introduced, to check the validity of the co-occurrence of two consecutive nouns in complex NG. If a query is constituted of a single NG, no further analysis is required. Otherwise, if a query covers two valid NG, it is a subject of studying the semantic coherence of the verb and both NG which are attached to it.展开更多
在综合分析传统多目标决策方法特点的基础上,提出了一套多目标决策满意解的选取策略。该策略首先采用备选方案逐次淘汰(successive elimination of alternatives based on order and degree of efficiency,SEABODE)法对非劣解集进行初筛...在综合分析传统多目标决策方法特点的基础上,提出了一套多目标决策满意解的选取策略。该策略首先采用备选方案逐次淘汰(successive elimination of alternatives based on order and degree of efficiency,SEABODE)法对非劣解集进行初筛,将非劣解集中解的数量进行精简;然后,采用功效系数法进行无量纲化处理;最后,建立层次分析-投影寻踪法(analytic hierarchy process-projection pursuit,AHP-PP)进行满意解的选择。基于目前常用的多属性决策方法比较研究,采用排名聚合技术和排名综合相关系数对所建立的AHP-PP法进行了评价。以南欧江梯级水库群多目标联合调度为例加以验证,结果表明:1)通过SEABODE法对非劣解进行初筛,可以有效缩小备选方案集,筛掉62.5%的较差解;2)AHP-PP法能够有效地将AHP法主观判断与PP法客观分析的优点相结合,具有较高的可靠性,可以得到更加合理可信的结果;3)AHP-PP法评价结果受无量纲化方法的影响较小,评价排序具有较高的稳定性。所提出的AHP-PP法这一多属性决策选取策略切实可行,且可以为梯级水库群多目标优化调度决策提供参考。展开更多
文摘This paper presents the semantic analysis of queries written in natural language (French) and dedicated to the object oriented data bases. The studied queries include one or two nominal groups (NG) articulating around a verb. A NG consists of one or several keywords (application dependent noun or value). Simple semantic filters are defined for identifying these keywords which can be of semantic value: class, simple attribute, composed attribute, key value or not key value. Coherence rules and coherence constraints are introduced, to check the validity of the co-occurrence of two consecutive nouns in complex NG. If a query is constituted of a single NG, no further analysis is required. Otherwise, if a query covers two valid NG, it is a subject of studying the semantic coherence of the verb and both NG which are attached to it.
文摘在综合分析传统多目标决策方法特点的基础上,提出了一套多目标决策满意解的选取策略。该策略首先采用备选方案逐次淘汰(successive elimination of alternatives based on order and degree of efficiency,SEABODE)法对非劣解集进行初筛,将非劣解集中解的数量进行精简;然后,采用功效系数法进行无量纲化处理;最后,建立层次分析-投影寻踪法(analytic hierarchy process-projection pursuit,AHP-PP)进行满意解的选择。基于目前常用的多属性决策方法比较研究,采用排名聚合技术和排名综合相关系数对所建立的AHP-PP法进行了评价。以南欧江梯级水库群多目标联合调度为例加以验证,结果表明:1)通过SEABODE法对非劣解进行初筛,可以有效缩小备选方案集,筛掉62.5%的较差解;2)AHP-PP法能够有效地将AHP法主观判断与PP法客观分析的优点相结合,具有较高的可靠性,可以得到更加合理可信的结果;3)AHP-PP法评价结果受无量纲化方法的影响较小,评价排序具有较高的稳定性。所提出的AHP-PP法这一多属性决策选取策略切实可行,且可以为梯级水库群多目标优化调度决策提供参考。
