爆炸现场要素判定专家系统的研究
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摘要
近年来,爆炸刑事案件不断发生。为了适应当前反恐、反黑和反暴力犯罪的需要,本文对爆炸刑事犯罪案件开展爆炸性物质建库工作,并且从爆炸物药量推算、爆炸物种类鉴别等方面开展研究,整合专业知识和专家经验,最终将计算机智能化技术引入到爆炸相关要素快速判定上,形成爆炸现场要素判定专家系统。
     本文的具体工作是对爆炸作用理论和试验规律、爆炸现场的爆炸痕迹勘验和残留物快速检验等方面展开研究,并且对爆炸物和标志物的相关数据和信息展开收集,建立起凝聚相炸药的药量推算和种类判定模型。在此基础上构建专家系统的数据库、知识库和推理机,再通过面向对象的Visual Basic语言形成爆炸现场要素判定专家系统的应用程序,实现对爆炸案件中爆炸物种类、药量等要素的快速判定。
     在爆炸现场要素判定专家系统中,知识库采用的是产生式规则和面向对象的表示方法,其具体表现为爆炸刑侦领域专业知识所产生的一系列“规则”。数据库采用的是状态空间表示形式,其具体内容是推理过程中所需要的一系列参数、条件等。推理机方面则采用似然推理与逻辑推理相结合的策略,在实际的操作过程中,它是通过程序引导、公式算法和检索机制相结合的方式得以实现的。
In recent years, the criminal case with explosion happened ceaselessly. In order to prevent violent crime, it is necessary to create database for explosives which were used in explosive case. The calculation of charge and identification of category for explosion must be studied, while integrating professional knowledge and experience of expert, finally to establish the factor judgment expert system on explosive case by the form of intelligent technology.
     In this paper, the specific work is studied on the law of explosive theory and the inspection of imprint and residue on explosion. It is useful to collect the data of explosives and marker and then build the model of charge-calculating and category-judging for explosives. In detail, it is necessary to build the database, knowledge base and inference engine of expert system and implement it with software by VB language. This software can be used to calculate explosive charge and judge explosive category for explosive case.
     In this expert system, knowledge base is established by the method of produced rule and object oriented representation. It is shown as professional knowledge of the explosion field which is generated by a series of rules. The database is established by the method of state space, it includes the data and conditions of expert system. Inference engine uses the strategy of reasoning combining between likelihood inference and logical inference. In the actual operation of the process, it is shown as the combining of program guiding, formula method and retrieval mechanism.
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