【摘要】 为了使特殊教育数据库系统具有较为理想的检索功能 ,本系统采用了分面分类技术、后控检索技术、超链接技术。由于分面分类体系中类名也就是主题词 ,因此本系统能方便地从分类主题两方面进行检索。同时由于这些主题词间具有网状关系 ,可以在这种网状结构中引入超链接技术 ,使用户能由此沿链进行更大范围或更专指的检索。此外由于联机分面分类词表的存在 ,本系统能较容易地实现后控检索技术 ,这使得本系统在采用自动标引和自然语言检索的同时 ,检索效果也得到保障。更多还原

【Abstract】 For enriching the database system of special education with ideal retrieval function,the facet classification,post controlled retrieval and hyper chaining techniques are employed.As the class name in the facet classification system is also its subject word,the retrieval can be easily conducted either with calss name or subject word.Meanwhile,as there is a net relation among the subject words,the hyper chaining technique can be introduced into this net structure.The clients can conduct wider and more specific retrievals along the chain.Besides,as there is a wordlist of facet classification,the post controlled retrieval can be used,thus making it possible to adopt automatic indexing and natural language with its retrieval effects guaranteed.更多还原