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1.
以RDF结构为基础的数据网的发展中,高效数据检索成为关键问题之一.形式化查询语言(如SPARQL)因其语法的复杂性及查询本体的相关性阻碍其效用的发挥,迫切需要新的方法或工具实现以自然语言为基础(如关键字检索)的检索.形式化查询语言是检索这类结构化数据的有效方式,用户习惯自然语言为基础的检索方式.因而如何自动将关键词为基...  相似文献   

2.
介绍了一个智能的互联网信息采集工具,它支持用户用自然语言查询,用知网抽取出查询语句中的关键词,进行自动分类,并自动去元搜索引擎上检索,生成网页搜索结果。该系统在准确率保持和手工获取相差不多的情况下,大大缩短了获取信息的时间,节省了人力。  相似文献   

3.
关键词检索方式是一种以词汇控制为主流控制方式的主题检索方式,它的致命不足是"字面匹配";概念控制仍属于词汇控制的范畴,只是用概念的相交、概念的匹配等逻辑方法实现的语义匹配取代传统的字面匹配。如何将检索从关键词层面提高到知识(或概念)层面,是目前情报信息检索领域研究的一个热点。文章通过对概念检索、语义检索以及两者之间关系的阐述,说明了如何实现自然语言检索中的概念语义控制,从而能够从概念语义层面上来认识和处理用户的检索需求。  相似文献   

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We present an effective technique for automatic extraction, representation, and classification of digital video, and a visual language for formulation of queries to access the semantic information contained in digital video. We have devised an algorithm that extracts motion information from a video sequence. This algorithm provides a low-cost extension to the motion compensation component of the MPEG compression algorithm. In this paper, we present a visual language called VEVA for querying multimedia information in general, and video semantic information in particular. Unlike many other proposals that concentrate on browsing the data, VEVA offers a complete set of capabilities for specifying relationships between the image components and formulating queries that search for objects, their motions and their other associated characteristics. VEVA has been shown to be very expressive in this context mainly due to the fact that many types of multimedia information are inherently visual in nature.  相似文献   

5.
CIMS领域中面向问题的自然语言人机接口研究   总被引:3,自引:0,他引:3  
沈军  顾冠群 《微机发展》2002,12(6):43-47
针对CIMS领域中决策层使用计算机的特点,分析了菜单式系统的缺点。在此基础上,提出了面向CIMS受限领域的自然语言人机接口的设计思路,并讨论其实现方法。  相似文献   

6.
针对CIMS领域中决策层使用计算机的特点,分析了菜单式系统的缺点.在此基础上,提出了面向CIMS受限领域的自然语言人机接口的设计思路,并讨论其实现方法.  相似文献   

7.
This paper concentrates on the problem of designing and developing a spoken query retrieval (SQR) system to access large document databases via voice. The main challenge is to identify and address issues related to the adaptation and scalability of integrating automatic speech recognition (ASR) and information retrieval (IR). In this paper, a Context Aware Language Model (CALM) framework allowing information retrieval to large document databases via voice is presented and findings from a research study using the framework will be discussed as well.  相似文献   

8.
文本检索的统计语言建模方法综述   总被引:2,自引:0,他引:2  
统计语言建模技术(statistical language modeling,SLM)已逐渐成为当前语言信息处理的主流技术之一.近几年的研究和实验表明,SLM技术在文本检索领域有着广阔的发展前景和拓展空间.对基于SLM的文本检索方法(SLMTR)进行了综述,重点论述SLMTR的主要方法和关键技术.首先对查询似然检索模型进行形式化的描述;然后详细论述语言模型的估计和数据平滑问题;并讨论了平滑对检索性能的影响;之后简要介绍了对查询似然模型的一些主要的扩展和改进工作;最后的总结部分讨论了SLMTR所面临的一些挑战.  相似文献   

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We refer "time-constrained services" to those requests that have to be replied to within a certain client-expected time duration. If the answer cannot reach the client within this expected time, the value of the information may seriously degrade or even become useless. On-demand channels may not be able to handle all time-constrained services without degrading the performance. How to handle these services in broadcast channels becomes crucial to balance the load of wireless systems. In this paper, we study this problem and find the minimum number of broadcast channels required for such a task. Also, we propose solutions for this problem when the available channels are insufficient. Our performance result reveals that only a moderate number of channels is required to promote these time-constrained services  相似文献   

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自然语言处理中词语上下文有效范围的定量描述   总被引:27,自引:0,他引:27  
鲁松  白硕 《计算机学报》2001,24(7):742-747
词语的上下文(context)是语料库语言学中自然语言知识获取和解决自然语言处理中多种实际应用问题必须依靠的资源和基础,但上下文“窗口”开多大为宜呢?为克服当前仅凭主观经验或通过某一特定应用问题中最终结果正确率界定上下文有效范围的不足,我们在引入信息增益方法确定上下文各位置的信息量后,构造上下文位置信息量函数,最终通过多项式积分确定85%信息量的上下文边界,即汉语核心词语最近距离[-8,+9]和英文[-16,+13]位置之间的上下文范围,该文的结果对上下文在自然语言处理中的价值和作用提出了一个具有统计意义的量化解释。  相似文献   

13.
用于计算机辅助教学的自然语言接口   总被引:1,自引:1,他引:1  
本文是为计算机辅助教学而专门设计的自然语言接口,它将限定子句文法和语义文法嵌入PROLOG语言,将三者融为一体,在微机上实现了一个自然语言接口程序,实验结果证明这种方法可应用于自然语言的受限领域,尤其适用于建立计算机辅助教学的自然语言接口。  相似文献   

14.
分析了多媒体数据与传统数据之间的异同。将多媒体数据的属性分成“内容无关”、“导出”、“用户定义”3种类型,研究了多媒体对象之间的相似特点,最后给出了4种基本查询类型。  相似文献   

15.
首先介绍了统计语言模型(SLM)的发展及常用的N元(n-gram)模型,对信息检索过程中的主要模型作了公式化描述并比较了不同模型,指出了它们之间及与传统概率检索方法的异同,分析了统计语言模型的弱点,最后介绍了对其可能的改进方法及最新研究进展,讨论了在中文信息检索中的应用和面对的挑战。  相似文献   

16.
This paper discusses the design and evaluation of an implemented user model in ICICLE, an instruction system for users writing in a second language. We show that in the task of disambiguating natural language parses, a blended model combining overlay techniques with user stereotyping representing typical linguistic acquisition sequences captures user individuality while supplementing incomplete information with stereotypic reasoning  相似文献   

17.
本文主要讨论在电子科技发展的今天,计算机技术与病历系统相结合,通过自然语言录入系统,转化为结构化数据的方法,形成电子病历.研究这些方法在电子病历系统应用中会出现的一些技术难点.  相似文献   

18.
Recently, natural language processing applications have become very popular in the industry. Examples of such applications include “semantic” enterprise search engines, document categorizers, speech recognizers and – last but not least – conversational agents, also known as virtual assistants or “chatbots”. The latter in particular are very sought-after in the customer care domain, where the aim is to complement the live agent experience with an artificial intelligence able to help users fulfil a task. In this paper, we discuss the challenges and limitations of industrial chatbot applications, with a particular focus on the “human-in-the-loop” aspect, whereby a cooperation between human and machine takes place in mutual interest. Furthermore, we analyse how the same aspect intervenes in other industrial natural language processing applications.  相似文献   

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Abstract

This paper presents a method of using BNF to specify natural language in such a way that a relatively small grammar of English can express the major grammatical constraints of the language and can be refined without undue proliferation of the rules. The results show that the departures of natural language from a context-free language are of a very restricted kind. The analysis obtained for sentences of the scientific literature is relevant for information processing  相似文献   

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