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商业银行的快速发展,并建立了全国性集中式计算机数据处理中心和网络系统,给金融审计工作带来了挑战与机遇,利用数据挖掘技术建立基于审计数据仓库的新型审计模型,为商业银行审计工作提供了有利契机。 相似文献
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本文构建了氯碱企业能量流模型,提出转换、分配、利用和回收四个环节;研究了氯碱企业能源优化配置问题,以企业净能耗最小为目标函数建立了氯碱企业能源优化分配模型。 相似文献
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针对电子废弃物回收物流网络中回收数量和质量的不确定性,提出将电子废弃物回收产品按质量等级分为3类,并将其数量和质量看成模糊参数,以回收成本、运输成本、投资成本及运营成本最低为总目标函数,建立带有模糊参数的电子废弃物逆向物流规划模型。利用三角模糊数将模糊约束条件清晰化,将模糊规划模型转化为确定型线性规划模型,利用LINGO9.0软件进行求解。研究结果表明:当回收数量和质量模糊变化时,广西电子废弃物逆向物流网络节点的选择没有发生变化,在南宁、贵港建立储存中心,同时在南宁建立处理中心和填埋场。 相似文献
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针对电动自行车电池回收网络不完善,电池回收处理流程不科学的问题,以我国现有电动自行车销售网点为基础,以企业构建电动自行车电池逆向物流网络的总成本最小为目标,建立电动自行车电池逆向物流的非线性混合整数规划网络模型,通过LINGO 11.0软件对该模型进行求解,以确定废旧电池回收中心、处理中心数量和位置。最后,通过算例验证模型的有效性。 相似文献
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In general, consumer utility of network goods is affected by the entire network size. The socio-cultural-economic affinities of consumers influence the network externality processes. In this work, we treat a consumer decision as a consumer decision dynamic process. We then formulate a dynamic structural representation of a consumer network structure, structure of utility function and decision rule under the influence of local network externality concept. This formulation generates a mathematical model for a consumer decision dynamic process. The byproduct of the dynamic model leads to an agent-based simulation model. The simulation model is used to investigate different types of consumer decision dynamic market equilibriums. Moreover, prototype illustrations are given to exhibit the association between network attributes and its market equilibriums. 相似文献
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We propose an Attention-LSTM neural network model to study the systemic risk early warning of China. Based on text mining, the network public opinion index is constructed and used as a training set to be incorporated into the early warning model to test the early warning effect. The results show that: (i) the network public opinion is the non-linear Granger causality of systemic risk. (ii) The Attention-LSTM neural network has strong generalization ability. Early warning effects have been significantly improved. (iii) Compared with the BP neural network model, the SVR model and the ARIMA model, the LSTM neural network early warning model has a higher accuracy rate, and its average prediction accuracy for systemic risk indicators has been improved over short, medium and long terms. When the attention mechanism is included in the LSTM, the Attention-LSTM neural network model is even more accurate in all the cases. 相似文献
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分析了废弃手机回收的影响因素,发现回收物流网络规划是提高回收率的关键问题。对废弃手机回收物流网络特性进行分析,建立回收物流网络模型,提出求解方式。最后以上海市为例,使用该模型建立手机回收物流网络,并对回收率变动情况下模型的敏感度进行分析。 相似文献
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This paper analyzes the endogeneity bias problem caused by associations of members within a network when the spatial autoregressive (SAR) model is used to study social interactions. When there are unobserved factors that affect both friendship decisions and economic outcomes, the spatial weight matrix (sociomatrix; adjacency matrix) in the SAR model, which represents the structure of a friendship network, might correlate with the disturbance term of the model, and consequently result in an endogenous selection problem in the outcomes. We consider this problem of selection bias with a modeling approach. In this approach, a statistical network model is adopted to explain the endogenous network formation process. By specifying unobserved components in both the network model and the SAR model, we capture the correlation between the processes of network and outcome formation, and propose a proper estimation procedure for the system. We demonstrate that the estimation of this system can be effectively done by using the Bayesian method. We provide a Monte Carlo experiment and an empirical application of this modeling approach on the friendship networks of high school students and their interactions on academic performance in the Add Health data. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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林产品的生产与需求随着环境不断的变化,如何建立在动态环境下的林产品物流网络模型是进行林产品物流规划的关键问题。本文在对林产品物流特点进行分析的基础上,结合林产品物流网络模型研究相关理论,构建了动态环境下的林产品物流物流网络模型。 相似文献
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集群企业二次创业已成为产业集群转型升级的重要路径,而集群企业网络影响了集群企业的二次创业行为。本文从复杂网络视角出发,在对集群企业网络与复杂网络模型之间耦合关系的探讨基础上,分析了用仿真方法构建集群企业网络,探讨了如何模拟集群企业网络中创业行为的传导,为刻画现实的集群企业创业行为传导过程和效果提供了新的分析思路。 相似文献