一种智能选择多维位置数据的移动定位体系结构*

使得对移动终端提供移动定位服务（MLS）成为可能。提出了一个与定位服务相关的层次模型和一种支持互联网及定位导航的定位服务体系结构,移动用户可以根据其当前的需要选择不同类型的位置数据输出。     

Runaway Electron Suppression by ECRH and RMP in KSTAR

We have observed reduction of the runaway electron synchrotron radiation, hard X-ray (HXR) intensity, and HXR energy after applying 110 GHz 2nd harmonic electron cyclotron resonant heating (ECRH) during runaway electron (RE) discharges at low density with startup runaway electrons. However, we did not see a significant reduction of X-rays from 170 GHz 2nd harmonic ECRH at a higher field. A recently installed IR TV camera was used to observe the forward cone of synchrotron radiation from high energy REs in KSTAR. We have observed changes to the synchrotron images and reduction of the HXR by application of resonant magnetic perturbations (RMP) from in-vessel control coils (IVCC) installed inside KSTAR in the n = 1 configuration.     

时空数据库中移动对象查询的选择性估算

目前,用来估算查询选择性的最有效的技术是直方图技术。通过特定的改进,直方图也可应用到时空查询优化中。TPR 树在对未来预测的时空索引中显示了很好的优越性。结合TPR 树索引结构,构建满足时空查询的直方图,估算时空查询的选择性。     

CTPR*-Link Tree :An Efficient Implementation on Indexing the Moving Object in Spatio-Temporal Database

1IntroductionSpatio-temporal database systems have developed dra-matically both in theory and in practice .Spatio-tempo-ral database deals with objects which change their loca-tion with the ti me[1].In term of indexing the currentand future positions of moving objects , the TPR*-tree[2]outperforms other indexing trees[3],such as PR-tree[4], NSI[5], and STAR-tree[6]both in theory andpractice . What s more ,the TPR*-tree canspeed up da-ta access if it is designed as main memory-based index…     

时空数据库中的移动对象索引研究

主要探讨了近年移动对象索引结构的研究成果,对不同的研究方法给出了比较,并且给出了移动对象索引结构的问题和发展方向。