Indexing large moving objects from past to future with PCFI

In moving object database,the moving objects’current position must be kept in memory,also to the trajectory,in some case,as same as the future. But the current existing indexes such as SEB-tree,SETI-tree,2+3R-tree,2-3RT-tree and etc. can only provide the capability for past and current query,and the TPR-Tree,TPR* -Tree and et. can only provide the capability for current and future query. None of them can provide a strategy for indexing the past,current and also the future information of moving objects. In this paper,we propose the past-current-future Index (PCFI-Index) to index the past,current & future information of the moving objects. It is the combination of SETI-tree and TPR*-tree,the SETI liking index is used for indexing the historical trajectory segments except the front line structure,and the moving objects’ current positions,velocities are indexed via the in-memory frontline strucltre which mainly implemented with TPR*-tree. Considering the large update operations on TPR-tree of large population,a hash table considering cache sensitivity is also introduced. It works with the frontline part,leading a bottom-up update of the tree. The performance analysis proves that the PCFI-iidex can handle most of the query efficiently and provides a uniform solution for the trajectory query,time-slice query,internal query and moving query.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices,an interest in LBS (Location Based Service) is arising. To provide location based service,tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then,store and manage have been studied. In this paper,we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques,we update the MODBMS when moving object arrived at a street intersection or a curved road which is rpresented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique,location data that are corresponding to the node in topology are stored,thus reduce the number of update and amount of data. Also in case predicting the location, because topology are used as well as existing location information,accuracy for prediction is increased than applying linear function or spline function.     

复功率注入空间中电力系统的实用动态安全域

为研究复功率注入空间中实用动态安全域的边界性质，针对多个典型电力系统，通过大量的仿真研究表明。在网络中不同位置发生持续不同时间的短路事故时，复功率注入空间中暂态稳定的临界点的集合可以使用一个或极少数几个超平面采近似描述．在包含暂态电压失稳现象的稳定问题研究中，复功率空间中的实用动态安全域具有更好的精度．文中详细讨论了这些近似描述与真实边界之间的差异并发现了实用动态安全域边界的迁移规律，上述研究大大拓宽了实用动态安全域适用的范围．最后通过对某电力大系统实用动态安全域的研究，验证了上述结论。     

一种基于群体智能聚类的设备性能横向比较算法

提出了一种基于群体智能的设备性能横向比较算法,该算法将设备模式投影于二维平面上,然后依据群体智能聚类,实现设备性能的自组织聚类分析.为了提高群体智能聚类算法的运行效率,提出了利用主成分分析改善模式投影时的随机性.此外,为了减小参数选取对算法的影响,提出了一种更简单的相似度衡量公式.将改进后的算法与原算法进行比较,结果显示,改进算法的运行效率更高.利用改进算法对某中央空调的数据进行分析,验证了算法能满足设备性能自组织聚类的要求.     

分子间作用力对制备含有机废弃之水泥浆体影响研究

研究以水泥处理固体有机物时, 有机物对水泥水化的影响.以膜流模式说明水份在水泥浆体内传输的现象.水膜存在半干之水泥浆体, 其厚度小于100 nm, 膜流由离分压所驱动,而离分压来自分子间作用力.膜拟结果发现, 水泥浆体内局部位置可用以进行水化之水量为Q=-Aslv/6vπ.当有机物添加在水泥浆体内时, 会影响Hamaker 常数,Aslv, 因此可能使膜流不稳定或完全抑制膜流, 因而使水泥浆体内局部缺水, 影响水化进行, 造成成品强度降低, 影响品质.     

Characteristics of U-pattern distribution of highconcentration ^210pb in surface air at central Guizhou, China

In recent thirty years, with deep-going studies of the problems of regional environmental quality and global climate change, 210Pb has been found to have wide appli-cations in tracing the aquatic sedimentation, catchment’s erosion and the path of atmospheric transfer. 222Rn pro-duced from decay of the U-Ra series in surface rocks and soils diffuses in the atmosphere and continues to decay into 210Pb. This part of the 210Pb, due to separation from its parent 226Ra, is generally referred to a…     

一种考虑修复非新的多设备串行系统机会维护动态决策模型

以由不同设备组成的无中间缓冲站的串行生产系统为研究对象,通过引入整合役龄递减因子和故障率递增因子的单设备预防性修复非新模型,建立了一种基于设备可靠性的多设备串行系统机会维护动态决策优化模型.该模型满足设备只有短期信息可用的实际操作特点,可为多设备串行系统的维护决策提供有力的支持.     

Solving traveling salesman problems by genetic algorithms

The gene section ordering on solving traveling salesman problems is analyzed by numerical experiments. Some improved crossover operations are presented. Several combinations of genetic operations are examined and the functions of these operations are analyzed. The essentiality of the ordering of the gene section and the significance of the evolutionary inversion operation are discussed. Some results and conclusions are obtained and given, which provide useful information for the implementation of the genetic operations for solving the traveling salesman problem.     

Computation speedup in the dynamic simulation of MEMS by macromodels

A doubly clamped microbeam actuated by electrostatic force with squeezed gas film damping is a well-known and standard micro-device in microelectromechanical system (MEMS) for many researchers to demonstrate how reduced-order dynamic macromodel is an effective way to faithfully capture the device behaviors. However it still takes time to directly recompute the time-dependant nonlinear terms in macromodels which are generated by a proper orthogonal decomposition (POD) method with Galerkin procedure at every time step during the macromodel simulation. This paper proposes two methods for speeding up the computation of macromodel simulations. In the first method, the computation speedup is achieved based on the concept of precomputation upon the basis functions are available. In the second method, cubic splines approximation is used to interpolate the basis functions and their first and second derivatives, and spatial integration is performed by application of the Gaussian quadrature. Numerical results show both methods could enhance the efficiency of the macromodel simulation compared with our previous computation results     

非接触嵌入式信息电子Agent预测技术及设备商务平台

研究了用于非接触式(Tether-free)设备性能衰退预测的嵌入式信息电子Agent(Embedded Infotronics Agent,EIA)技术.分析了如何强化小脑模型节点控制器网络(Cerebella Model Articulation Controller,CMAC)算法,并将其运用到EIA实现的关键——看门狗(Watchdog Agent)预测技术中去;在详细分析设备商务(Device-to-Business,D2B)系统的基础上,提出定制维护(Customized Maintenance,CM)概念和理论,给出了D2B技术理论在齿轮箱衰退性能研究上的架构实例,并初步验证了相关技术的可行性.随着相关研究和应用的深入推广,传统的维护领域势必会产生革命性的变化.