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刘天民 《烟台大学学报(自然科学与工程版)》1991,(2)
本文着重论析了面形分割构成独特的审美性。指出这种构成形式得以成立的关键,是以线分割母面形后,所得五面形必须成为互相依存、牢不可分的,具有符合审美法则的视觉力学关系的整体。提出在作面形分割构成的基本训练中,兼做多种造型表现上的研究与体验的方法。 相似文献
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This paper examines the sensitivity of forecasts to the level of aggregation of the data. A relative shares regression model and a multinominal logit model are tested with both aggregate and disaggregate survey data from 2109 respondents. The results indicate the appropriate model to use depends on whether the data are disaggregate or aggregate in form. Forecasts of solar heating of dwelling unit demand and market shares are also reported for Canada in terms of the solar price relative to the natural gas price and solar reliability relative to natural gas reliability. 相似文献
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The most common approach to combining forecasts at different levels of aggregation has been to sum (or average) the more disaggregated forecast, and take a weighted average of the aggregate forecasts. This paper develops a simple method for obtaining minimum variance pooled forecasts at the disaggregated level. The major advantage that this method has over the common approach is that it provides pooled forecasts at both the aggregated and disaggregated level. As will be shown, the resulting aggregate pooled forecast is identical to the forecast which would be obtained by simply pooling two forecasts at the aggregate level, while the disaggregated forecast maintains the aggregation identity required by the problem. 相似文献
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基于自适应遗传算法的传感器网络数据融合算法 总被引:2,自引:0,他引:2
能源有效性是无线传感器网络(WSN)路由算法设计要考虑的首要问题,数据融合可以通过合并冗余数据而有效地节约能耗.提出了一种基于自适应遗传算法(AGA)的WSN数据融合算法,基于移动代理(MA)对Sink节点发出兴趣代理报文和目标节点发出数据代理报文进行转发.采用AGA求出MA最优路由节点序列,通过把WSN均匀分割为多个大小适当的二维网格,形成AGA的初始群体.仿真结果表明,随着网络规模增大,和局部最近邻优先算法(LCF)相比,该算法有更小的网络能耗和延时. 相似文献
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本文报道β-(5-R-苯基-2-呋喃基)乙烯基-3H-吲哚盐的紫外可见吸收光谱数据。对各谱带归属进行了研究,确认λ~1,λ~2是分子局部共轭结构部分引起的,λ~3是分子整体共轭的表征,λ~4为聚集态谱带並求得聚集数为2,还讨论了R对λ~3的影响。 相似文献
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以国有商业银行数据集中为背景,分析客户数据集中后业务后台运行中出现的主要风险及其产生根源;从管理学和控制论角度提出提高商业银行后台运行效率,防范银行内部操作风险的具体措施。有利于商业银行增强自身风险防范能力,促进业务稳定运行。 相似文献