共查询到19条相似文献,搜索用时 171 毫秒
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针对不完备信息系统条件下的辐射源威胁等级判定问题,提出了一种基于改进容差关系粗糙集(ITR-RS)的不完备信息系统辐射源威胁等级判定方法。该方法将粗糙集中的不完备信息系统理论引入辐射源威胁等级判定中,并构建一套完备的决策规则提取模型。此外,利用辨识矩阵实现对属性的约简,在降低系统所需处理数据量的同时,提高了算法的实时性;在容差关系粗糙集的基础上,提出一种改进的容差关系,在属性主、客权重相结合的基础上引入阈值来划分加权阈值容差类,得到更为合理、准确的决策规则。仿真试验及分析表明,与经典RS算法相比,所提算法的威胁等级判定正确率提高了23%,可用于信息系统不完备条件下的辐射源威胁等级判定。 相似文献
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针对斜划分决策树算法普遍存在时间效率低、部分算法仅能应用于二分类问题,提出了一种基于加权距离的聚类决策树算法。通过Relief-F算法为预测属性计算权重,并将权重用于树结点中数据的聚类过程,使用分簇结果对结点进行多路划分,得到可直接用于多分类问题的决策树。理论分析和实验结果表明,该算法与经典轴平行决策树相比,拥有更好的泛化能力以及相近的算法时间复杂度,与大部分斜决策树相比,在付出更少计算代价的前提下,获得了近似的正确率以及模型简洁度。 相似文献
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针对稀土产业可持续发展,提出了一种新的评价模型。该模型的不同在于首先采用模糊C均值聚类算法对数据进行预处理,然后再基于粗糙集的属性约简以及属性重要度思想,做出改进,对现有指标进行精简并确定约简后各指标的权重,从而形成综合测评。最后还通过包头市高新区的稀土产业进行了实证研究,说明了该评估模型优于现有评价方法避免了主观性,同时相比原始粗糙集方法,进一步简化了评估过程,提高了工作效率,具有一定的理论意义与实践意义。 相似文献
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针对判断矩阵专家赋权研究多使用硬性聚类以及类间权重值可能出现相同值的情况,提出了基于模糊C均值聚类和距离的赋权方法。该方法首先利用模糊C均值聚类对专家所给出的排序向量进行分类,然后根据聚类结果计算出各专家的类间权重和类内权重,从而集结为属性权重。在类间权重确定过程中,引入类间距离权重,给出一种新的类间权重计算方法。文末给出的算例表明,所提出的方法是可行、有效的。 相似文献
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Sandra J. Burke 《Marketing Letters》1996,7(3):215-224
Research has shown consumers either form inferences to fill in missing information or adapt processing to accommodate missing values. This article illustrates that processing may influence which attributes are deemed necessary for the choice task and consequently inferred and that attribute-based processing,leads to inference use. The article also tests a framework that incorporates missing information, processing, inference use, and evaluation variables into a single parsimonious model that shows (1) the effects of missing information on processing and inference use and (2) the effects of inference use on evaluations. The model incorporates a link between processing and inference use that may help explain mixed results regarding the degree and direction of impact of missing information on evaluations. Finally, it explores other variables such as missing information overlap, product familiarity and importance, and attribute type that may also influence inference use. 相似文献
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《International Journal of Research in Marketing》2022,39(1):190-211
In many markets, consumers use attribute information to assess the value they expect from purchasing a product or service. This includes many low involvement experience goods including take-out food, many packaged good categories and restaurants. In these markets, quality differences exist but many differences are horizontal in nature: the consumer is interested in finding a product that meets her unique tastes. Beyond ensuring that consumers know the brand, the category and the price; it seems advertising should provide consumers with attribute information. However, a significant proportion of advertising does not provide it. In fact, within the same category, competitors respond to messages that emphasize detailed attribute information with messages that are devoid of attribute information. These messages are uninformative about product attributes. We explore how competition in a differentiated market is affected by the ability of a firm has to choose uninformative messages. We construct a model to investigate the factors that affect a firm’s decision to use advertising with detailed attribute information or advertising that does not provide it. The model demonstrates that content decisions about advertising are affected by the differences between products, the range of heterogeneity in consumer tastes and the degree to which costs increase as a function of the quantity of information in advertising. Surprisingly, even when the cost to increase the quantity of information in advertising is low, uninformative campaigns can be more profitable than campaigns with attribute information. The analysis also demonstrates that firms can be more likely to provide attribute information when there are less consumers that are attribute-sensitive. Finally, the model shows that uninformative messages can create “artificial differentiation” in some situations. 相似文献
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The paper presents the results of an extensive study on the determinants of customer satisfaction for a retail bank. In doing so, it uses a revised version of the traditional analyses based on derived measures of attribute importance. The need for a revised methodology is prompted by the insights of the two- and three-factor theories of customer satisfaction, such as Kano's framework. Indeed, the evidence from 5000 customers of a prominent Italian bank confirms a non-linear and asymmetric relationship between attribute performances and overall customer satisfaction. The results from both a traditional and our revised approach are compared. While this approach can be applied across different industries, it should not be assumed that the numerical results presented in the paper apply to contexts with substantially different underlying characteristics. General trends and implications for banking services are reported in the conclusions. 相似文献
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技术性贸易壁垒扩散效应分析 总被引:1,自引:0,他引:1
文章采用描述性统计方法和数据挖掘中的关联规则挖掘方法,分别从数量、商品类别和国家地区三个角度,研究分析了1998-2002年间国外技术性贸易壁垒条例出台扩散效应的特点和规律。为进一步把握条例出台的原因和趋势,找出条例间的关联关系,预测新条例的出台提供了有益的参考信息。 相似文献
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制造企业的材料采购是很重要的环节。本文运用系统的方法,提出了在制造企业供应链采购管理难点和存在的诸多问题,并提出完善信息网络,建立采购信息数据库;重视采购成本的综合考虑;从对采购商品的管理转变为对供应商的管理等策略,期望为制造企业的采购管理提供借鉴。 相似文献