支持关键词搜索的空间连接查询研究

近年来,许多实际应用不仅需要支持空间连接查询而且需要具备关键词搜索功能,以帮助用户查找那些既满足空间连接条件又包含指定关键词的空间对象组合.正是在这种需求的驱动之下,定义了一种具备关键词搜索功能的空间连接查询(Spatial Join with Keyword Search,缩写SJKS),并提出了一种基于IR2-Tree的SJKS查询处理算法(IR2-TreeSJKS算法),旨在实现关键词搜索与空间连接查询的高效结合.实验表明,本算法可有效支持具有关键词搜索功能的空间连接查询处理.     

烟叶原料智能仓储综合管理平台的构建

通过构建烟叶原料智能仓储综合管理平台,同时对平台的各个模块进行研究,形成包芯监控、垛内监控、仓间监控和预警等模块,实现烟叶原料智能仓储功能,提高烟叶仓储的精益管理水平,实现了烟叶养护过程数据由传统的手工记录转为系统自动采集,使片烟养护过程的数据具有信息化、可追溯化及可视化功能,实现了对垛内醇化片烟包芯温度进行全生命周期...     

输电线路耐张线夹的数字射线检测

耐张线夹的压接质量直接关系输电线路的安全.通过设计相应检测工装、改良检测设备等措施,成功利用数字射线(DR)技术,对耐张线夹的压接质量进行了检测,既满足了相关标准的要求,又提高了检测效率,为输电线路的安全提供了保障.     

数字水准仪测量系统关键算法

针对数字水准仪如何实现自动化读数问题,根据"用不同宽度的条码组合来表征数字水准仪标尺面的不同高度位置"的编码原则,研究了双正弦条码标尺应用于电子水准测量中实现标尺自动化读数的定位原理.基于两正弦信号的相位差和采样值组合都分别与标尺位置一一对应的关系,讨论了两种不同参量的自动测量算法,推导并给出了计算公式,一种方法是采用傅里叶变换和线性换算解码读数,另一种方法是利用条码图像宽度匹配和几何法解码读数.根据两种解码方法各自的特点,选取相应的信号参量设计出合适的条码.条码读数模拟实验结果表明了两种解码算法的有效性.     

IEEE 802.15.4对WLAN抗干扰性能的实验研究

针对2.4 GHz频段内的IEEE 802.15.4,研究其与无线局域网共存时的抗干扰性。实验设定了多种场景并测试了实际应用环境中IEEE 802.15.4的通信质量。实验数据表明,WLAN干扰可使IEEE 802.15.4数据丢包率高达94%。通过实验数据分析得到了IEEE 802.15.4通信节点丢包率与WLAN信道、节点发送功率以及RSSI的相关性,为研究WSN的同频抗干扰技术提供了有价值的实验依据。     

不正常航班恢复的飞机和乘客优化调配模型

现实生活中有很多因素影响航空公司的正常运营,比如飞机故障、极端天气、航空管制等,这些问题的产生不仅增加了航空公司的运营成本,而且还给乘客带来许多损失。为了降低航空公司的运营成本和乘客的损失,从飞机调配和受干扰乘客的重新调配出发构建模型,通过IBM ILOG CPLEX软件对两个模型进行求解,并获得了备用恢复行程的飞机调配方案和受干扰乘客的重新调配方案。通过实际算例验证了该模型的有效性和实用性。     

心率信号的采集与处理

介绍了一种基于SoC的简单心率测量方法。整体系统设计包括模拟电路模块和C51CPU核。其中CPU核是数字处理部分，用来处理心率信号和其它应用的输出信号。经过模拟电路模块，心率信号被转换成脉冲信号，然后把脉冲信号作为心率估算的输入信号进行计算。整个系统工作在一片芯片上。     

Research on Hot-line Cleaning of Artificial Contaminanted Insulator Using High Pressure Hot Water Vapor

The hot-line cleaning of insulator contaminants has a great significance to prevent pollution flashover.The technique of hot-line cleaning insulator contaminants by water vapor is proposed in this paper.The flashover characteristics of insulator under the procedure of cleaning by hot-line water vapor are tested to investigate the security of cleaning system in the operation.Three kinds of insulator are chosed to carry on the experiment.The average flashover voltage,flashover voltage gradient and withstand voltage in35 kV insulators in hot-line cleaning are measured.The results show that the average flashover voltage and withstand voltage of insulators used for hot-line water vapor cleaning are both larger than the operation phase voltage in 35 kV system.The flashover voltage gradient is larger than usual pollution flashover voltage gradient.The system security can be ensured when there is no overvoltage in the system,which verifies that the insulators cleaning method presented in this paper is effective and reliable.     

Functional organisation of the endomembrane network in the digestive gland of the Venus flytrap: revisiting an old story with a new microscopy toolbox

Up-to-date imaging approaches were used to address the spatiotemporal organisation of the endomembrane system in secretory cells of Dionaea muscipula. Different ‘slice and view’ methodologies were performed on resin-embedded samples to finally achieve a 3D reconstruction of the cell architecture, using ultrastructural tomography, array tomography, serial block face-scanning electron microscopy (SBF-SEM), correlation, and volume rendering at the light microscopy level. Observations of cryo-fixed samples by high-pressure freezing revealed changes of the endomembrane system that occur after trap activation and prey digestion. They provide evidence for an original strategy that adapts the secretory machinery to a specific and unique case of stimulated exocytosis in plant cells. A first secretion peak is part of a rapid response to deliver digestive fluids to the cell surface, which delivers the needed stock of digestive materials ‘on site’. The second peak of activity could then be associated with the reconstruction of the Golgi apparatus (GA), endoplasmic reticulum (ER) and vacuolar machinery, in order to prepare for a subsequent round of prey capture. Tubular continuum between ER and Golgi stacks observed on ZIO-impregnated tissues may correspond to an efficient transfer mechanism for lipids and/or proteins, especially for use in rapidly resetting the molecular GA machinery. The occurrence of one vacuolar continuum may permit continuous adjustment of cell homeostasy. The subcellular features of the secretory cells of Dionaea muscipula outline key innovations in the organisation of plant cell compartmentalisation that are used to cope with specific cell needs such as the full use of the GA as a protein factory, and the ability to create protein reservoirs in the periplasmic space. Shape-derived forces of the pleiomorphic vacuole may act as signals to accompany the sorting and entering flows of the cell.     

一种基于Verilog HDL的OBS汇聚模块的实现方案

对光突发交换(OBS)网络的边缘节点进行了研究,给出了一种新型的OBS边缘节点汇聚模块的实现方案.与以往基于软件仿真的方法不同,该方案以FPGA芯片EP2C20Q240C8为平台,采用Verilog HDL语言编写实现.时序分析结果显示:该汇聚模块能够实现两种基本的汇聚算法(FAP和FBL),同时占用芯片资源和时延情况分析结果也能满足OBS网络的传输需求.