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Impact of multipath effects on theoretical accuracy of TOA-based indoor VLC positioning system 被引量:9
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作者 Xuqing Sun Jingyuan Duan +1 位作者 Yonggang Zou Ancun Shi 《Photonics Research》 SCIE EI 2015年第6期296-299,共4页
This paper discusses the time-of-arrival(TOA) based indoor visible light communication(VLC) positioning system in a non-line-of-sight environment. The propagation delay is assumed to be gamma distributed. The generali... This paper discusses the time-of-arrival(TOA) based indoor visible light communication(VLC) positioning system in a non-line-of-sight environment. The propagation delay is assumed to be gamma distributed. The generalized Cramer–Rao lower bound for multipath propagation is derived as the theoretical accuracy limitation. The performance of the positioning system is affected by the shape parameter and the scale parameter of gamma distribution.The influences on positioning accuracy of multipath effects are analyzed through discussing the physical meaning of the gamma distribution parameters. It is concluded that the lower bound of positioning accuracy is attained when variance of the non-line-of-sight propagation-induced path lengths is zero. The simulation result provesthat the theoretical positioning accuracy is in the order of centimeters with the given scenario. 展开更多
关键词 VLC TOA impact of multipath effects on theoretical accuracy of TOA-based indoor VLC positioning system
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Impact of crude distillation unit model accuracy on refinery production planning 被引量:3
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作者 Gang FU Pedro A.Castillo CASTILLO Vladimir MAHALEC 《Frontiers of Engineering Management》 2018年第2期195-201,共7页
In this work, we examine the impact of crude distillation unit(CDU) model errors on the results of refinery-wide optimization for production planning or feedstock selection. We compare the swing cut + bias CDU model w... In this work, we examine the impact of crude distillation unit(CDU) model errors on the results of refinery-wide optimization for production planning or feedstock selection. We compare the swing cut + bias CDU model with a recently developed hybrid CDU model(Fu et al., 2016). The hybrid CDU model computes material and energy balances, as well as product true boiling point(TBP) curves and bulk properties(e.g., sulfur% and cetane index, and other properties). Product TBP curves are predicted with an average error of 0.5% against rigorous simulation curves. Case studies of optimal operation computed using a planning model that is based on the swing cut + bias CDU model and using a planning model that incorporates the hybrid CDU model are presented. Our results show that significant economic benefits can be obtained using accurate CDU models in refinery production planning. 展开更多
关键词 impact of model accuracy on productionplanning swing cut+ bias CDU model hybrid CDUmodel refinery feedstock selection optimization optimization of refinery operation
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