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日子数在太阳位置计算中的应用 被引量:6
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作者 杜春旭 王普 +1 位作者 马重芳 吴玉庭 《太阳能学报》 EI CAS CSCD 北大核心 2011年第11期1640-1645,共6页
介绍并比较了几种太阳能利用中广泛应用的太阳位置算法,并总结在具体应用中其主要变量日子数的具体算法,不同的太阳位置算法使用合适的日子数算法能提高计算结果的精度。计算结果表明,使用正确的日子数算法,其算法精度至少可提高30%,若... 介绍并比较了几种太阳能利用中广泛应用的太阳位置算法,并总结在具体应用中其主要变量日子数的具体算法,不同的太阳位置算法使用合适的日子数算法能提高计算结果的精度。计算结果表明,使用正确的日子数算法,其算法精度至少可提高30%,若将Bourges的赤纬角算法与Lamm的时差算法相结合,其太阳高度角、方位角计算误差均在0.02°以内。 展开更多
关键词 太阳跟踪 太阳位置 日子数
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Self-Organized Algorithm in LTE Networks: A Utility Function Based Optimal Power Control Scheme
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作者 XU Haitao AN Jianwei 《China Communications》 SCIE CSCD 2014年第A02期95-101,共7页
In this paper, transmission power control problem for uplink LTE network is investigated and a new autonomic uplink power control scheme was proposed based on utility function, which is a self- organized algorithm. Th... In this paper, transmission power control problem for uplink LTE network is investigated and a new autonomic uplink power control scheme was proposed based on utility function, which is a self- organized algorithm. The whole approach is based on the economic concept named utility function. Then a self-organized algorithm is distributed in each mobile users to control the transmission power and to maximize the transmission utility. The proposed scheme is solved through the Lagrange multiplier technique. It is proved that the utility function based algorithm optimal power level can be model. is applicable and the achieved based on our 展开更多
关键词 SELF-ORGANIZED power control utilityfunction LTE networks lagrange multiplier
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