| 1 | Review of fast methods for point-based computer-generated holography [Invited]显示文摘Computer-generated holography(CGH) is a technique for converting a three-dimensional(3D) object scene into a two-dimensional(2D), complex-valued hologram. One of the major bottlenecks of CGH is the intensive computation that is involved in the hologram generation process. To overcome this problem, numerous research works have been conducted with the aim of reducing arithmetic operations involved in CGH. In this paper,we shall review a number of fast CGH methods that have been developed in the past decade. These methods,which are commonly referred to as point-based CGH, are applied to compute digital Fresnel holograms for an object space that is represented in a point cloud model. While each method has its own strength and weakness,trading off conflicting issues, such as computation efficiency and memory requirement, they also exhibit potential grounds of synergy. We hope that this paper will bring out the essence of each method and provide some insight on how different methods may crossover into better ones. | P.W.M.TSANG T.-C.POON Y.M.WU | 2018 | Photonics Research2018，6，9： | 10 |
| 3 | 台湾省地震速报和地震早期警报系统的进展显示文摘报告了台湾省实时地震监测的最新进展,特别是中央气象局(CWB)开发的地震速报(RRS)和地震早期警报系统(EWS)的最新进展。该系统利用的是自由场强地面运动仪遥测传输的信号。为地震速报之目的,中央气象局从1995年起在大地震(M> 4级)发生后一分钟之内提供地震烈度图、震中和震级参数,并以电子信息文件形式提供给政府机构和科学家,其可靠性近乎完美,特别是对破坏性大地震而言。利用1999 年集集地震期间收集到的大量数据,得出了一组经验关系式,以此中央气象局能够在大地震发生后的几分钟之内,通过速报系统发布计算出的PGA、PGV和可能的破坏分布情况。这种近实时的破坏评估对震灾快速应急响应和救助行动的展开具有重要作用。快速确定震级是根据自动生成的有效子台网的前10 s记录来实现的。以此为基础,得出一个监测软件,据此我们能够做出30 s之内的地震速报。这是向更实际的地震早期警报迈出的重要一步。从2002年起,该地震早期警报系统已经在中央气象局运行。综合的地震报告大部分能在地震发生之后30 s内发布,平均时间为22 s。当地震发生在距城市不足66 km时由于典型地壳剪切波速为3 km/s,现时的操作系统是无效的,而对于离震源的距离大于100 km的城市来说,前导时间会增加到10 s 以上。在后一种情况下,几秒钟的前导时间将足以使预编程序的应急响应在破坏性强震到达之前启动。 | Y.M.Wu T.L.Teng N.C.Hsiao T.C.Shin W.H.K.Lee Y.B.Tsai 陈长林 陈英方译 尹志军校陈英方 尹志军 | 2005 | 世界地震译丛2005，，2： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员