With the reform of rural network enterprise system,the speed of transfer property rights in rural power enterprises is accelerated.The evaluation of the operation and development status of rural power enterprises is d...With the reform of rural network enterprise system,the speed of transfer property rights in rural power enterprises is accelerated.The evaluation of the operation and development status of rural power enterprises is directly related to the future development and investment direction of rural power enterprises.At present,the evaluation of the production and operation of rural network enterprises and the development status of power network only relies on the experience of the evaluation personnel,sets the reference index,and forms the evaluation results through artificial scoring.Due to the strong subjective consciousness of the evaluation results,the practical guiding significance is weak.Therefore,distributed data mining method in rural power enterprises status evaluation was proposed which had been applied in many fields,such as food science,economy or chemical industry.The distributed mathematical model was established by using principal component analysis(PCA)and regression analysis.By screening various technical indicators and determining their relevance,the reference value of evaluation results was improved.Combined with statistical program for social sciences(SPSS)data analysis software,the operation status of rural network enterprises was evaluated,and the rationality,effectiveness and economy of the evaluation was verified through comparison with current evaluation results and calculation examples of actual grid operation data.展开更多
针对格网DEM难以对黄土高原梯田地形进行有效数字表达的问题,基于面向对象思想提出了能够顾及梯田地形的Grid-TIN混合格网DEM(Grid-TIN based DEM,GT-DEM)概念及其数据模型,并阐明其主要特征及与传统DEM的关系。以陕西绥德县辛店沟小流...针对格网DEM难以对黄土高原梯田地形进行有效数字表达的问题,基于面向对象思想提出了能够顾及梯田地形的Grid-TIN混合格网DEM(Grid-TIN based DEM,GT-DEM)概念及其数据模型,并阐明其主要特征及与传统DEM的关系。以陕西绥德县辛店沟小流域水平梯田为例,利用现有1∶1万格网DEM、梯田特征点线及其外围边界线,构建出能够充分顾及梯田地形的GT-DEM。研究表明,利用现有格网DEM和梯田地形特征点线构建顾及梯田地形GT-DEM的技术可行。GT-DEM不仅可对研究区全局地形进行粗略表达,而且可对其局部梯田地形进行精细表达。该研究是对如何提高DEM的梯田地形数字表达能力的有益探索,对进一步提高DEM对淤地坝、鱼鳞坑等其他人工地形的数字表达能力具有重要借鉴意义。展开更多
数据聚合是智能电网通信中的一项关键技术,能够以高效节能的方式收集用户用电数据。随着智能电表的大规模部署,这引发了诸多用户隐私方面的担忧,例如对个人生活习惯的监测。提出了一种高效且保护隐私的数据聚合方案(efficient and priva...数据聚合是智能电网通信中的一项关键技术,能够以高效节能的方式收集用户用电数据。随着智能电表的大规模部署,这引发了诸多用户隐私方面的担忧,例如对个人生活习惯的监测。提出了一种高效且保护隐私的数据聚合方案(efficient and privacy-preserving data aggregation,EPPDA)。首先,提出基于区块链的智能电网4层架构支持电力数据聚合。在架构的采集层中,改进了基础的Boneh-Goh-Nissim加密系统,使其更适合于电网隐私保护场景。在架构的平台层,利用区块链的防篡改特性对聚合数据进行有效的存储及查询。性能分析结果表明:提出的EPPDA可以满足智能电网系统的几种隐私特性。实验数据表明:EPPDA在保证数据隐私和安全的条件下降低了计算与通信成本,提高了整个方案的效率。展开更多
基金Supported by Funding(2017RAXXJ075)from Harbin Applied Technology Research and Development Project
文摘With the reform of rural network enterprise system,the speed of transfer property rights in rural power enterprises is accelerated.The evaluation of the operation and development status of rural power enterprises is directly related to the future development and investment direction of rural power enterprises.At present,the evaluation of the production and operation of rural network enterprises and the development status of power network only relies on the experience of the evaluation personnel,sets the reference index,and forms the evaluation results through artificial scoring.Due to the strong subjective consciousness of the evaluation results,the practical guiding significance is weak.Therefore,distributed data mining method in rural power enterprises status evaluation was proposed which had been applied in many fields,such as food science,economy or chemical industry.The distributed mathematical model was established by using principal component analysis(PCA)and regression analysis.By screening various technical indicators and determining their relevance,the reference value of evaluation results was improved.Combined with statistical program for social sciences(SPSS)data analysis software,the operation status of rural network enterprises was evaluated,and the rationality,effectiveness and economy of the evaluation was verified through comparison with current evaluation results and calculation examples of actual grid operation data.
文摘针对格网DEM难以对黄土高原梯田地形进行有效数字表达的问题,基于面向对象思想提出了能够顾及梯田地形的Grid-TIN混合格网DEM(Grid-TIN based DEM,GT-DEM)概念及其数据模型,并阐明其主要特征及与传统DEM的关系。以陕西绥德县辛店沟小流域水平梯田为例,利用现有1∶1万格网DEM、梯田特征点线及其外围边界线,构建出能够充分顾及梯田地形的GT-DEM。研究表明,利用现有格网DEM和梯田地形特征点线构建顾及梯田地形GT-DEM的技术可行。GT-DEM不仅可对研究区全局地形进行粗略表达,而且可对其局部梯田地形进行精细表达。该研究是对如何提高DEM的梯田地形数字表达能力的有益探索,对进一步提高DEM对淤地坝、鱼鳞坑等其他人工地形的数字表达能力具有重要借鉴意义。
文摘数据聚合是智能电网通信中的一项关键技术,能够以高效节能的方式收集用户用电数据。随着智能电表的大规模部署,这引发了诸多用户隐私方面的担忧,例如对个人生活习惯的监测。提出了一种高效且保护隐私的数据聚合方案(efficient and privacy-preserving data aggregation,EPPDA)。首先,提出基于区块链的智能电网4层架构支持电力数据聚合。在架构的采集层中,改进了基础的Boneh-Goh-Nissim加密系统,使其更适合于电网隐私保护场景。在架构的平台层,利用区块链的防篡改特性对聚合数据进行有效的存储及查询。性能分析结果表明:提出的EPPDA可以满足智能电网系统的几种隐私特性。实验数据表明:EPPDA在保证数据隐私和安全的条件下降低了计算与通信成本,提高了整个方案的效率。
基金The National Natural Science Foundation of China under Grant No.60402011the National Eleven Five-Year Scientific and Technical Support Plans of China under Grant No.2006BAH03B05~~
