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三角形packing问题中零自由度动作的分类 总被引:1,自引:0,他引:1
三角形packing问题中三角形可以进行连续平移和旋转,如果不对三角形放置动作进行限制,则计算将无法实现。本文提出了零自由度动作概念,并对它进行了详细的分类,为求解三角形Packing问题建立了一个接近客观情况的模型。 相似文献
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HACCP认证标签对商品价格有影响吗?--来自北京市海淀区六大超市奶制品的调查研究 总被引:2,自引:1,他引:2
本文以奶制品为例,通过对北京市海淀区六大超市奶制品进行的产品调查,运用特征价格模型分析HACCP认证标签对商品价格的影响程度。结果表明,商品价格不仅受到来自产品本身特征等因素的影响,而且还与HACCP认证有正相关的关系:容量为1升的奶制品一旦获得HACCP认证标签,商品价格将增加0.21元。约为其单价的2.38%。最后,本文提出了加强对消费者HACCP认证产品的宣传、促进企业采用HACCP体系认证、提高食品的盾量安全水平等政筻律议. 相似文献
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The non-symmetry anti-packing image representation (NAIR) uses a sequence of the instances of some predefined prototypes to represent an image. While significantly reducing the instances required to represent an image in contrary to the quadtree and the linear quadtree, however, NAIR has lost the explicit space relationship among these instances and hence made some geometric operations such as perimeter computation hard to be implemented. In this paper, longitude and latitude grid (L^2G), a data structure which can restore lost space relationship from the NAIR is first presented, and then a novel algorithm to compute the perimeters of the images represented by the NAIR is presented. The experimental results show that the new algorithm has saved at least 90% of the running time comparing with that based on the quadtree. 相似文献
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INTRODUCTION Most packing problems (Dowsland and Dow-sland, 1992) are NP-hard (Garey and Johnson, 1979); among which are bin-packing, floorplan, rectangle packing, packing a set of circles into a large circle or square, non-rectangular packing problems and so on (Li and Milenkovic, 1995; Liang et al., 2002; Lip-nitskii, 2002; Milenkovic and Daniels, 1996; Milenk-ovic et al., 1991; Osogami and Okano, 2003; Wang, 2002). Some of these such as bin-packing problem and rectangle packing p… 相似文献
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随着INTERNET/INTRANET的迅速普及,JAVA编程语言越来越受到编程人员的青睐,JAVA语言以其平台无关性、安全、维护方便等特性,成为数据库开发的理想语言。本主要讨论了JAVA与数据库的接口JDBC的原理、结构等内容。 相似文献
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基于建构主义的教学内容可视化研究 总被引:1,自引:0,他引:1
可视化技术可以提供知识的有效表达和传递。本文在探索性地提出基于建构主义的教学内容可视化方法基础上,就如何基于建构主义确定可视化目标给出了解决方案。通过相关课件的制作和教学实践,总结了可视化课件的评价和教学应用原则。 相似文献
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