基于组合模型的我国煤炭需求预测     

方媛媛  杨桂元  陶新新 《哈尔滨学院学报》2013,34(9):36-40

文章首先分别建立灰色GM（1,1）预测、Holt．Winters无季节性指数平滑预测和BP神经网络预测模型对中国1980—2011年的煤炭需求进行定量分析,然后建立组合预测模型,最后采用组合预测模型预测2012—2021年我国的煤炭需求量,结果表明这十年间我国煤炭需求量稳步增长。到2021年,需求量达到539942万吨。  相似文献   

On-line learning performance and computer anxiety measure for unemployed adult novices using a grey relation entropy method     

Jyh-Rong Chou  Hung-Cheng Tsai 《Information processing & management》2009

On-line learning is an asynchronous computer-based learning mode that allows learners to learn anytime and anywhere in their own environment using information and communication technology. It can be considered as a way to bridge the digital gap. How a computer novice performs in such virtual and asynchronous learning environments is an interesting issue in human–computer interaction research. This paper presents the results of a study to investigate on-line learning performance and computer anxiety for unemployed adult novices. In this study, we propose a novel idea that integrates the concept of Shannon entropy into a grey relational analysis model. The proposed method was used to measure human information behavior in relation to on-line learning performance and computer anxiety. A total of 115 unemployed adults voluntarily participated in the experimental study. All experimental subjects were divided into groups according to individual differences in gender, age ranges, educational levels, and learning performances. Taking advantage of the grey relation entropy operation, we derived the perceptive correlations among different classified groups in terms of the accessibility of on-line learning and computer anxiety scales, respectively. Through the empirical study, certain on-line learning characteristics were also identified.  相似文献   

事业编制总量调控方法与模型   总被引：1，自引：0，他引：1  

邓群钊  彭峰 《软科学》2009,23(10):55-58,82

为了对变革中的事业编制总量进行合理调控,基于偏好DEA与灰色Verhulst模型提出了总量测算与配置方法。从分析事业编制总量与经济社会发展的关系入手,运用偏好DEA模型确定近期各年中编制总量的有效范围,针对编制总量序列所呈现的"S"形波动特点,引入灰色Verhulst模型预测编制总量未来的可行范围,结合区域编制现状确定总量控制目标,在此基础上借助投影分析建立了区域内各地的编制配置模型。对江西省的实例分析结果表明该方法是有效可行的。  相似文献   

乙烯行业低碳管理评价指标体系的构建及分析     

刘学之 《科技管理研究》2017,(22)

石油化工产业不仅是我国国民经济发展的重要支柱产业,更是我国碳排放重点监控的产业之一,构建科学有效的低碳管理评价体系对产业低碳建设与发展具有推动作用。乙烯行业作为一国石油化工产业发展水平的重要标志,以其为代表进行低碳管理指标体系研究对整个化工行业企业的低碳建设具有借鉴意义。基于此,本文以乙烯行业为研究对象,尝试构建一个多层次低碳综合评价指标体系,将VIKOR算法与改进的灰色关联度算法相结合,形成了VIKOR－灰色关联度综合评价模型,并以某A乙烯企业为例进行实证分析,评价其低碳管理效果,最后,针对乙烯行业企业的低碳管理现状提出相关改进建议。  相似文献   

资源型城市可持续发展水平评价   总被引：1，自引：0，他引：1  

董锋  谭清美  周德群  龙如银  朱佳翔 《资源科学》2010,32(8):1584-1591

在资源型城市发展水平评价中,传统GDP方法没有考虑环境污染、资源损耗等因素,没有考虑可持续发展。本文尝试在可操作性和全面性前提下对绿色GDP和真实储蓄率评价方法进行改进,重点探讨固定资本折旧、资源变化和污染损失的计算,同时引入灰色关联分析方法,建立系统分析与模糊分析相结合的资源型城市可持续发展水平评价体系。用此评价体系本文对大庆市2003年-2007年城市可持续发展水平进行评价,结果发现： ①从2003年到2007年,大庆市GDP年均增长12.8%,绿色GDP年均增长13.3%,真实储蓄年均增长15.7%,从数字上来看,绿色GDP比GDP要少近1/6,真实储蓄比绿色GDP略少;②2003年-2007年大庆市可持续发展能力不断提高,2007年灰色关联综合指数比2003年增长1.22倍,其中经济指标贡献最大,资源与环境指标其次,社会指标贡献最小。最后本文根据实证结果给出大庆市应积极鼓励非油产业发展、大力发展第三产业等可持续发展建议。  相似文献   

PCX格式图象文件的伪灰度打印     

赵铭建 《临沂师范学院学报》1996,(3)

着重讨论了ＰＣＸ格式图象文件２５６色和１６色的存储格式及图象数据压缩原理，并给出了ＰＣＸ格式图象文件的通用打印源程序．  相似文献   

内外涨落效应对单一种群数量的影响     

陈俊  成传明  谢红 《郧阳师范高等专科学校学报》2001,21(6):21-23

通过分析随机的佛霍尔斯特方程,讨论了内外涨落对单一物种演化的影响.即当涨落不可忽略,即使繁殖率小于死亡率,种群物种数量仍有可能保持在一个较小的规模.当增长率小于零,内涨落对物种数量的定态几率分布曲线的影响更明显;当增长率大于零,外涨落对物种数量的定态几率分布曲线的影响更显著.  相似文献   

Application of grey relational analysis in sheet metal forming for multi-response quality cnaracterlsncs     

XIE Yan-min YU Hu-ping CHEN Jun RUAN Xue-yu 《浙江大学学报(A卷英文版)》2007,8(5):805-811

The theory of grey systems is a new technique for performing prediction, relational analysis and decision making in many areas. In this paper, the use of grey relational analysis for optimizing the square hole flanging process parameters with considerations of the multiple response （the average flanging height, regular flanging and maximum strain） is introduced. Various flanging parameters, such as the blank inner radius rb, blank inner width B0, are considered. An orthogonal array is used for the experimental design. Multiple response values are obtained using finite element analysis （FEA）. Optimal process parameters are determined by the grey relational grade obtained from the grey relational analysis for multi-performance characteristics （flanging height, regular flanging and maximum strain）. Analysis of variance （ANOVA） for the grey relational grade is implemented. The results showed good agreement with the experiment result. Grey relational analysis can be applied in multiple response optimization designs.  相似文献   

Application of grey relational analysis in sheet metal forming for multi-response quality characteristics     

XIE Yan-min  YU Hu-ping  CHEN Jun  RUAN Xue-yu 《浙江大学学报(A卷英文版)》2007,8(5):805-811

The theory of grey systems is a new technique for performing prediction, relational analysis and decision making in many areas. In this paper, the use of grey relational analysis for optimizing the square hole flanging process parameters with considerations of the multiple response (the average flanging height, regular flanging and maximum strain) is introduced. Various flanging parameters, such as the blank inner radius rb, blank inner width B0, are considered. An orthogonal array is used for the experimental design. Multiple response values are obtained using finite element analysis (FEA). Optimal process parameters are determined by the grey relational grade obtained from the grey relational analysis for multi-performance characteristics (flanging height, regular flanging and maximum strain). Analysis of variance (ANOVA) for the grey relational grade is implemented. The results showed good agreement with the experiment result. Grey relational analysis can be applied in multiple response optimi-zation designs.  相似文献   

澳大利亚大学图书馆灰色文献建设研究——基于对澳大利亚8所大学图书馆灰色文献的调查     

刘丽华  魏小贞 《图书馆工作与研究》2022,(1)

本文通过对澳大利亚8所名校图书馆灰色文献建设情况进行调查,分析了澳大利亚8所名校图书馆收藏的灰色文献类型与主题分布、灰色文献收集方式、灰色文献组织与揭示方式、灰色文献服务与版权保护措施;提出我国应将灰色文献打造成图书馆特色文献资源建设的核心业务,构建符合学科特色的灰色文献资源体系,开展以用户需求为中心的灰色文献精准服务,加强灰色文献版权保护等建议。  相似文献