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基于数据挖掘技术的证素辨证方法研究
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摘要
辨证论治是中医学的特点与精华,是中医在诊治疾病时应当遵循的原则。其科学性、优越性与必要性,已为长期的医疗实践所证实。无论疾病病种是否明确,辨证论治都能够根据每个人的具体病情进行灵活地处理,从而大大丰富了中医学对疾病的处理能力。然而长期以来,中医学对于“证”的规律性、系统性还研究不够,辨证方法有多种,辨证概念较为混乱,病情千变万化,证名异同难辨,临床不可能只按某一法进行辨证,而必须诸法综合起来运用。这给中医临床、科研、教学带来了很大的困难。辨证统一体系的创立,无疑为中医现代化奠定了基础。辨证统一体系是一种科学性强的中医辨证方法,它的核心思想是征素辨证。在证素辨证中,辨证过程由辨证要素推理和证名组合两个环节构成。辨证要素推理是依据病人的临床症状、体征等信息,判定相关的证素,然后由证素组合构成符合中医习惯的证名术语,以指导临床处方用药。在统一辨证体系下,建立科学的证素辨证定性、定量标准,不仅是中医临床医生的需要,也是信息社会中新的医疗模式建立的基础。当前,医生采用证素辨证方法时,对证素的确认知识主要来自文献、专家等各种途径,通过收集、总结形成的知识。由于文献记载长期以来对证候的辨识主要-是采取主观定性的方法,使得辨证论治带有较强的经验性和主观性,导致从文献或专家等多种途径得到的辨证知识具有模糊性和不一致性,因此,建立科学的证素辨证定性定量标准,是辨证统一体系推广应用的关键。自辨证统一体系提出以来,有不少研究人员以临床数据库为基础,通过模糊数学、统计分析、神经网络等方法在证素辨证规则的获取、症状对证素影响的定量分析等方面做了许多探索性工作,但由于所用学习方法自身的缺点和局限性,如泛化能力差,或对先验知识的要求高等,使得研究没有获得突破性进展。
     本研究以临床信息为对象,从数据挖掘技术应用入手,在证素辨证体系的框架下,揭示中医辨证的规律,寻找确认证素的科学方法,明确证素、常见证的特征证候,各症状的诊断贡献度,建立体现辨证论治规律的数学模型,进一步将为中医电子病历、诊断决策支持研究等多学科与中医的交融奠定技术基础。具体研究内容有:通过分别采用目前公认的数据挖掘新方法:支持向量机与粗糙集的一些算法,对已收集的临床病历数据进行实验分析,探索利用这些方法解决中医证素辨证建模的可行性。同时,对朱文锋教授通过研究归纳而建立的一套专用于证素辨证的“双层频权剪叉算法”进行实验分析研究。最后,比较实验结果,并对实验结果进行分析。拟解决的问题为:寻找提高证素辨证准确率的方法,构建证素辨证基础研究平台。论文首先对证素辨证客观化研究的情况作了综述,然后对证素辨证客观化研究技术进行分析比较,概述了现有研究技术基本情况及存在的缺陷,并提出粗糙集、支持向量机技术应用的优点。然后对数据挖掘与中医诊断研究的关系进行了探讨,接着介绍了ROUGHSETS与证素辨证关联规则的获取、SVM与证素辨证预测模型的建立、“双层频权剪叉算法”与证素辨证量表的制定三项研究工作情况,最后,进行总结和讨论,并提出了今后工作的方向。
As the characteristic and essence of the traditional Chinese medicine, the treatment after syndrome differentiation is a binding principle in the medical practices.Its scientific nature,excellence,and necessity have been proved by extensive medical practices in the history.Syndrome differentiation provides a particular treatment according to the individual patient's particular symptoms in a flexible mode,no matter whether the type of disorder has been confirmed or not.However,in the past ages,insufficient effort has been devoted to the study of the rules and systems of differentiation in the TCM circle.As there were various differentiation methods,confusing concepts,thousands of syndrome descriptions and implicit syndrome names,medical practitioners could not merely adopt a single method for syndrome differentiation,but have to apply a number of methods comprehensively.That brought large difficulties in medical practices,research and education.The establishment of uniform syndrome differentiation architecture doubtlessly laid a foundation for TCM's modernization.As a highly scientific methodology,the essential of the uniform syndrome differentiation architecture is the element differentiation.In the element differentiation,the process was composed of two steps-element reasoning and the forming of the syndrome name.The syndrome element reasoning is to be conducted according to the patient's symptoms and signs to pin down relevant syndrome elements,then combine elements to form a syndrome name that is in accordance to the TCM's accepted practices,so as to guide the practical prescription and treatment.Establishing scientific qualitative and quantitative criteria for the element differentiation under the uniform syndrome differentiation architecture is demanded not only by the TCM practitioners,but also as a foundation of the new medical care system demanded by the information society.In current practices of element differentiation,TCM practitioners normally acquire knowledge about syndrome elements recognition through collecting and distilling information from relevant publications and comments of experts.As most of the records in the publications on syndrome differentiation cover mostly subjective and qualitative methods,the treatment practices based on syndrome differentiation was comparatively empirical and subjective.Thus the syndrome differentiation knowledge acquired from publications and experts' comments were normally ambiguous and inconsistent.Therefore,setting up a scientific qualitative and quantitative measurement standard for syndrome element differentiation is the corner stone for promoting the application of the uniform syndrome differentiation architecture.Since the emergence of the uniform syndrome differentiation,researchers,facilitated by use medical databases,have made a lot of explorative work on fields such as acquisition of syndrome element differentiation rules,quantitative analysis on the impact of symptoms to syndrome elements and so on.Nevertheless,due to the defects and constraints of the learning methods,such as low deduction and high standard for empirical knowledge acquisition,there has been no breakthrough development in the research.
     Taking the information acquired in medical practices as research objective and employing data mining technologies,the research aims to explore for scientific methods of syndrome element recognition so as to provide technical support for finding a high speed and highly effective syndrome differentiation model for diseases prevention and treatment, and for solving some key technical issues in medical practices.Furthermore,the research aims to lay a foundation for convergence between the TCM and some inter-disciplinary studies such as the electronic medical record and the decision support system for diagnosis etc;and willlay a foundation for the studies on optimal disease treatment rules,optimal TCM prescription and specific therapy or medicine for a variety of complications.The research involves in using well acknowledged new data mining methods-some algorithms that support the SVM and the rough sets to conduct experimental analysis to collected data from medical cases,and hence to discuss on the feasibility of using those methods to establish a model for syndrome element differentiation in TCM practices.Meanwhile,the research will conduct experimental analysis on the double layer spectrum weighted cross cutting algorithm for syndrome element differentiation put forwarded by Prof.Zhu Wenfeng after he studied and distilled for scores of years.At last,a comparative analysis will be conducted to the results of the experiments.The problems to address are exploring for methods to improve the accuracy of the syndrome element differentiation and construct a platform for its fundamental research.The thesis begins with introductive summary to the research on objectivity of syndrome element differentiation.It follows with a summary of existing research techniques and a comparative analysis to them,and points out their defects,and hence put forward the advantages of applying fought set and SVM techniques.The paper then discusses the relationship between the data mining and studies on TCM diagnosis,acquisition of the rules for association between rough set and syndrome element differentiation,SVM and construction of a predictive model for syndrome element differentiation,the double layer spectrum weighted cross cutting algorithm,and construction of syndrome element table.In conclusion,a summary was made to wrap up the discussion and a direction was pointed out for future studies.
引文
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