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三维交叉影线绘制算法研究
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作者 胡斌 李云芝 《指挥技术学院学报》 1997年第1期52-58,共7页
在分析绘制参数曲面浮动水平线算法基础上,针对使用上浮动水平线的情况,改进了浮动水平线算法,并结合三维几何变换、投影变换以及绘制交叉影线的基本思想,提出了一种三维交叉影线的绘制算法,并研究了使用不同颜色绘制三维交叉影线... 在分析绘制参数曲面浮动水平线算法基础上,针对使用上浮动水平线的情况,改进了浮动水平线算法,并结合三维几何变换、投影变换以及绘制交叉影线的基本思想,提出了一种三维交叉影线的绘制算法,并研究了使用不同颜色绘制三维交叉影线,以便更好地表现三维立体形状。 展开更多
关键词 浮动水平线 算法 交叉影线 计算机图形学
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漫话西洋刀剑
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作者 王福阳 郭仲明 《中华武术》 1998年第9期28-28,共1页
关键词 西洋 大马士革 15世纪 17世纪早期 伊斯兰教 交叉影线 大规模制造 硬化工艺 马铁匠 刀剑
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Polarization Projection for 3D Geometry-Based Stochastic Channel Model
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作者 PANG Lihua ZHANG Yang +5 位作者 GONG Fengkui WANG Anyi XIAO Liyuan LIANG Xiao WANG Qiaofeng LI Jiandong 《China Communications》 SCIE CSCD 2015年第10期52-63,共12页
Comprehensive radiation characteristics of polarized antenna are crucial in creating practical channel coefficients for next generation wireless communication system designs.Being currently supported within3 D geometr... Comprehensive radiation characteristics of polarized antenna are crucial in creating practical channel coefficients for next generation wireless communication system designs.Being currently supported within3 D geometry-based stochastic channel models(GSCM),field patterns are technically obtained by chamber measurement(or by its best fitting).However,in some channel related performance analysis scenarios,design insight can be crystallized better by starting the derivations with theoretical co-polarization and cross-polarization components.Specifically,these two components are mathematically linked with field patterns through the proposed polarization projection algorithm.In this manuscript,we focus on revealing the transformation criterion of polarization states between the antenna plane and the propagation plane.In practice,it makes retrieving the field patterns by electromagnetic computation possible.Meanwhile,the impact imposed by distinct antenna orientations is geometrically illustrated and consequently incorporated into the proposed algorithm.This will further facilitate flexible performance evaluation of related radio transmission technologies.Our conclusions are verified by the closed-form expression of the dipole field pattern(via an analytical approach) and by chamber measurement results.Moreover,we find that its 2D degenerative case is aligned with the definitions in 3^(rd) generation partnership project(3GPP)technical report 25.996.The most obvious benefit of the proposed algorithm is to significantly reduce the cost on generating channel coefficients in GSCM simulation. 展开更多
关键词 polarization 3D geometry-based stochastic channel model antenna orientation radiation characteristics dipole chamber measurement channel simulation
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