Attribute Reduction of Hybrid Decision Information Systems Based on Fuzzy Conditional Information Entropy

The presence of numerous uncertainties in hybrid decision information systems(HDISs)renders attribute reduction a formidable task.Currently available attribute reduction algorithms,including those based on Pawlak attribute importance,Skowron discernibility matrix,and information entropy,struggle to effectively manages multiple uncertainties simultaneously in HDISs like the precise measurement of disparities between nominal attribute values,and attributes with fuzzy boundaries and abnormal values.In order to address the aforementioned issues,this paper delves into the study of attribute reduction withinHDISs.First of all,a novel metric based on the decision attribute is introduced to solve the problem of accurately measuring the differences between nominal attribute values.The newly introduced distance metric has been christened the supervised distance that can effectively quantify the differences between the nominal attribute values.Then,based on the newly developed metric,a novel fuzzy relationship is defined from the perspective of“feedback on parity of attribute values to attribute sets”.This new fuzzy relationship serves as a valuable tool in addressing the challenges posed by abnormal attribute values.Furthermore,leveraging the newly introduced fuzzy relationship,the fuzzy conditional information entropy is defined as a solution to the challenges posed by fuzzy attributes.It effectively quantifies the uncertainty associated with fuzzy attribute values,thereby providing a robust framework for handling fuzzy information in hybrid information systems.Finally,an algorithm for attribute reduction utilizing the fuzzy conditional information entropy is presented.The experimental results on 12 datasets show that the average reduction rate of our algorithm reaches 84.04%,and the classification accuracy is improved by 3.91%compared to the original dataset,and by an average of 11.25%compared to the other 9 state-of-the-art reduction algorithms.The comprehensive analysis of these research results clearly indicates that our algorithm is highly effective in managing the intricate uncertainties inherent in hybrid data.

Vibration Based Tool Insert Health Monitoring Using Decision Tree and Fuzzy Logic

The productivity and quality in the turning process can be improved by utilizing the predicted performance of the cutting tools.This research incorporates condition monitoring of a non-carbide tool insert using vibration analysis along with machine learning and fuzzy logic approach.A non-carbide tool insert is considered for the process of cutting operation in a semi-automatic lathe,where the condition of tool is monitored using vibration characteristics.The vibration signals for conditions such as heathy,damaged,thermal and flank were acquired with the help of piezoelectric transducer and data acquisition system.The descriptive statistical features were extracted from the acquired vibration signal using the feature extraction techniques.The extracted statistical features were selected using a feature selection process through J48 decision tree algorithm.The selected features were classified using J48 decision tree and fuzzy to develop the fault diagnosis model for the improved predictive analysis.The decision tree model produced the classification accuracy as 94.78%with five selected features.The developed fuzzy model produced the classification accuracy as 94.02%with five membership functions.Hence,the decision tree has been proposed as a suitable fault diagnosis model for predicting the tool insert health condition under different fault conditions.

Emergency Decision-Making Based on q-Rung Orthopair Fuzzy Rough Aggregation Information

With the frequent occurrences of emergency events,emergency decision making(EDM)plays an increasingly significant role in coping with such situations and has become an important and challenging research area in recent times.It is essential for decision makers to make reliable and reasonable emergency decisions within a short span of time,since inappropriate decisions may result in enormous economic losses and social disorder.To handle emergency effectively and quickly,this paper proposes a new EDM method based on the novel concept of q-rung orthopair fuzzy rough(q-ROPR)set.A novel list of q-ROFR aggregation information,detailed description of the fundamental characteristics of the developed aggregation operators and the q-ROFR entropy measure that determine the unknown weight information of decision makers as well as the criteria weights are specified.Further an algorithm is given to tackle the uncertain scenario in emergency to give reliable and reasonable emergency decisions.By using proposed list of q-ROFR aggregation information all emergency alternatives are ranked to get the optimal one.Besides this,the q-ROFR entropy measure method is used to determine criteria and experts’weights objectively in the EDM process.Finally,through an illustrative example of COVID-19 analysis is compared with existing EDM methods.The results verify the effectiveness and practicability of the proposed methodology.

Ordinal Decision Trees

In many decision making tasks,the features and decision are ordinal.Several ordinal classification learning algorithms have been developed in recent years,it is shown that these algorithms are sensitive to noisy samples and do not work in real-world applications.In this work,we propose a new measure of feature quality, called rank mutual information.Then,we design an ordinal decision tree(REOT) construction technique based on rank mutual information.The theoretic and experimental analysis shows that the proposed algorithm is effective.

Vibration-Based Fault Diagnosis Study on a Hydraulic Brake System Using Fuzzy Logic with Histogram Features

The requirement of fault diagnosis in the field of automobiles is growing higher day by day.The reliability of human resources for the fault diagnosis is uncertain.Brakes are one of the major critical components in automobiles that require closer and active observation.This research work demonstrates a fault diagnosis technique for monitoring the hydraulic brake system using vibration analysis.Vibration signals of a rotating element contain dynamic information about its health condition.Hence,the vibration signals were used for the brake fault diagnosis study.The study was carried out on a brake fault diagnosis experimental setup.The vibration signals under different fault conditions were acquired from the setup using an accelerometer.The condition monitoring of the hydraulic brake system using the vibration signal was processed using a machine learning approach.The machine learning approach has three phases,namely,feature extraction,feature selection,and feature classification.Histogram features were extracted from the vibration signals.The prominent features were selected using the decision tree.The selected features were classified using a fuzzy classifier.The histogram features and the fuzzy classifier combination produced maximum classification accuracy than that of the statistical features.

Optimization in Site Selection of Wind Turbine for Energy Using Fuzzy Logic System and GIS—A Case Study for Gujarat

The development of new wind energy project requires studying of many parameters to achieve maximum benefits at the cost of minimum environmental impacts. Using Geographic Information System (GIS), an analytical framework has been developed in this paper with fuzzy logic to evaluate the suitable site for turbines for optimum energy output. The criteria for suitable site for energy optimization are environmental, physical and human factors. The present study helps to assess the appropriate sites for the wind turbines in Gujarat. The result obtained from the study conveys the suitability of the development of wind turbines along the western parts of Gujarat. The suggested model could be used for the future site selection of the wind turbine which in turn could be of orientation for energy planners and decision makers.

基于北斗卫星通信导航的电力应急抢修指挥系统设计

电力系统运行环境复杂,受高电压、不均衡负载等因素的影响,导致应急抢修指挥过程中故障定位精度较差,抢修耗时长。为此,提出一种基于北斗卫星通信导航的电力应急抢修指挥系统。系统硬件以北斗卫星通信导航平台作为核心,设计北斗卫星通信导航平台的监测模块、故障提取与转发模块、路径规划模块、调度中心模块。根据模块化的设计理念,设计故障定位与最佳路径规划的软件程序,通过信息熵算法与决策树得到应急状态的划分,通过不同等级安排相应的抢修策略,完成电力应急抢修的指挥。实验结果表明,所提方法的抢修时间短、故障定位效果好、失负荷量小。

基于模糊测度的模糊分支时态逻辑模型检测

针对具有模糊性和不确定性的复杂系统的验证问题,提出一种基于模糊测度的模糊分支时态逻辑模型检测算法。首先,在模糊决策过程模型的基础上引入模糊分支时态逻辑的语法和语义。然后,给出模糊分支时态逻辑模型检测算法,该算法将模型检测问题转化为矩阵运算,具有计算方式简洁、复杂度较低的优点。最后,通过医疗专家系统的实例说明了该模型检测算法的有效性。

基于自信息熵的直觉模糊决策系统的属性约简

针对在直觉模糊集中,利用下近似构建的约简只考虑了下近似而忽略了上近似,从而导致一些信息丢失的问题,基于直觉模糊集的上、下近似提出了3种熵度量,并将其应用于直觉模糊决策信息系统的约简之中。在直觉模糊决策信息系统上定义用于描述直觉模糊关系的3种不确定性度量,分别为平均决策指数、平均安全决策指数以及平均风险决策指数,并在此基础上依次提出了条件信息熵、条件粗糙熵和自信息熵,基于自信息熵给出了相应的约简定义以及属性约简算法。在多个数据集上的实验表明,所提出的属性约简算法与其他算法相比,约简结果更具有优越性以及鲁棒性。

结合改进PSO和模糊决策树的医院信息系统数据分类研究

医疗系统的使用量与日俱增导致医疗系统中的相关医疗数据也在不断地增加。为此优化模糊ID3算法和改进粒子群算法,并将改进粒子群算法进行智能寻优从而改善模糊决策树性能。实验结果表明,提出的IPSO-FDT算法在皮马印第安人糖尿病、威斯康星乳腺癌和帕金森氏病数据集中的测试准确率分别为97.9%、89.5%和81.8%,在生成树的概括能力数值分别为1.003、1.034、1.026,显著高于比较模型。实验数据证明,在医院信息系统进行数据分类的多种算法中,此设计的结合改进PSO与模糊决策树算法具有一定适用性。

一种基于粗糙集构造决策树的新方法

在构造决策树的过程中 ,分离属性选择的标准直接影响分类的效果。基于粗糙集的理论提出了加权平均粗糙度的概念 ,将其作为选择分离属性的标准。经实验证明 ,用该方法构造的决策树与传统的基于信息熵方法构造的决策树相比较 ,复杂性低 ,且能有效提高分类效果。

利用决策树进行数据挖掘中的信息熵计算

介绍了怎样通过信息量或熵的比较来构造一个决策树的数据挖掘算法，并且就一些特殊的地方进行了讨论分析，例如怎样处理高分枝属性、数值属性和缺失数据以及怎样剪枝．利用模型系统的一些源代码来具体地实现算法中的一些模块，并且描述了国内外的有关数据挖掘的研究情况．

信息系统的模糊风险评估模型

提出了一种信息系统的综合风险评估模型。首先采用AHP(analytic hierarchy process)与模糊逻辑法相结合的方法进行风险评估,并根据信息系统风险评估的实际情况对2种方法进行了改造。应用模糊逻辑法对各个风险因素从概率方面、影响方面、不可控制性方面分别评价其重要度,利用AHP求出各个风险因素的风险值,通过比较各个因素的风险值,指出哪些风险需要采取措施加以控制。其次通过引进信息熵,求出各个风险因素在系统风险评估中所占的比例,可以计算整个系统的风险度,由此决定系统的总体风险水平。通过实例分析可知,该模型可以方便地用于信息系统风险评估,实验结果符合实际。

决策树的优化算法

决策树的优化是决策树学习算法中十分重要的分支．以ＩＤ３为基础，提出了改进的优化算法．每当选择一个新的属性时，算法不是仅仅考虑该属性带来的信息增益，而是考虑到选择该属性后继续选择的属性带来的信息增益，即同时考虑树的两层结点．提出的改进算法的时间复杂性与ＩＤ３相同，对于逻辑表达式的归纳，改进算法明显优于ＩＤ３．

基于信息熵的决策属性分类挖掘算法及应用

在利用判定树进行分类挖掘时,需事先知道属性的分类。对不具体的或未知的属性分类,利用“高类聚、低耦合”原理对属性进行最优分类。在属性分类的基础上,利用基于信息熵的属性期望信息及对应的信息增益理论选择最佳分类决策属性,并按最佳分类决策属性引出分枝形成判定树。该文对属性的最优分类理论及算法进行了描述,并讨论了选择最佳决策属性构造判定树的算法,结合具体应用实例进行了验证并构造了判定树。

基于相对决策熵的决策树算法及其在入侵检测中的应用

为了弥补传统决策树算法的不足,提出一种基于相对决策熵的决策树算法DTRDE。首先,将Shannon提出的信息熵引入到粗糙集理论中,定义一个相对决策熵的概念,并利用相对决策熵来度量属性的重要性;其次,在算法DTRDE中,采用基于相对决策熵的属性重要性以及粗糙集中的属性依赖性来选择分离属性,并且利用粗糙集中的属性约简技术来删除冗余的属性,旨在降低算法的计算复杂性;最后,将该算法应用于网络入侵检测。在KDD Cup99数据集上的实验表明,DTRDE算法比传统的基于信息熵的算法具有更高的检测率,而其计算开销则与传统方法接近。

基于最大熵原理的空间特征选择方法

特征选择在模式识别和数据挖掘等领域都有十分广泛的应用.然而,当涉及空间数据时,由于传统特征选择方法没有很好地考虑数据的空间特性,所以会导致特征选择结果性能下降.从空间数据本身的特性出发,提出一种特征选择方法MEFS(maximum entropy feature selection).MEFS在基于最大熵原理的基础上,运用互信息和Z-测试技术,采用两步方法进行空间特征选择.第1步,空间谓词选择;第2步,选择与每个空间谓词对应的相关属性集.最后,分别对MEFS方法和RELIEF方法以及基于MEFS的分类方法与决策树算法ID3分别进行了实验比较.实验结果表明,MEFS方法不仅可以节约特征提取和分类时间,而且也极大地提高了分类质量.

基于决策树生成及剪枝的数据集优化及其应用

为提高智能模型的识别精度,增强其泛化能力,需要对用于智能建模的数据集中的对象类别异常进行检测和修正。在进行数据集和决策树形式化描述的基础上,将基尼指数增益率作为确定连续条件属性最优二分原则,采用递归算法生成叶节点中对象为同一类别的二叉决策树。利用信息熵评价决策树剪除叶节点中对象的类别分布效果,实现数据集类别异常的类别修正。决策树的生成和剪枝本质上是完成基于基尼指数和信息熵的连续条件属性数据空间分割和合并类别修正。实验和实际应用验证了决策树生成和剪枝是数据集类别优化的有效方法。

基于改进的C4.5算法的网络流量分类方法

在基于C4.5算法的网络流量分类方法中,网络流量数据量的海量性及其特征的多样性使得决策树的构建速度、分类速度成为评价网络流量分类器的重要标准。在原C4.5算法的基础上提出一种改进的信息熵的计算方法,通过减少计算函数的复杂度,提高决策树的构建速度。实验表明,基于改进后算法的分类器在达到原有分类准确率的同时,极大地缩短了决策树的构成时间。

基于多模型的滑坡易发性评价——以甘肃岷县地震滑坡为例

2013年7月22日,甘肃省岷县漳县交界处发生了MS6.6级地震（岷县地震）,本文以这次地震烈度Ⅷ度区为研究区,根据地震前后遥感影像解译出来的2330个地震滑坡数据,以坡度、坡向、水系、岩性和断层为因子图层,分别应用模糊逻辑法,信息量模型及Shannon熵改进的信息量模型,对研究区的地震滑坡易发性进行评价.结果表明①滑坡的高易发性地区位于研究区的中间部分,以及水系0～50m这一缓冲区范围内,离水系越近滑坡易发性等级越高;②应用ROC曲线对3个模型的易发性评价结果进行比较,信息量模型和Shannon熵改进的信息量模型的AUC值分别为0.8488,0.8502;模糊逻辑模型的AUC值为0.7640,表明前两个模型的表现较好,而模糊逻辑模型相对来说表现一般;③通过对比3个模型中各等级易发性所占的面积比例和各等级易发性中滑坡数目占总数比例,表明Shannon熵改进后的模型更适用于灾害风险评价以及应急风险管理等实际应用.