可扩展的并行地理图像处理系统     

方金云  何建邦  池天河  胡伟武  史岗  张福新 《地球信息科学学报》2000,2(4):62-66

可扩展的并行地理图像处理系统 (Par GIP)是基于多操作系统平台的机群并行图像处理系统 ,它采取Client- Server结构 ,采用插件技术和算法化的处理操作 ,具有良好的发展前景.  相似文献   

基于Hilbert空间排列码的海量空间数据划分算法研究   总被引：1，自引：0，他引：1  

王永杰  孟令奎  赵春宇 《武汉大学学报(信息科学版)》2007,32(7):650-653

在深入分析了Hilbert空间排列码的线性映射特性后，将其应用于数据划分之中，并给出了具体的实现算法。本算法既考虑了空间目标的聚集性，又考虑了各个划分结点上数据存储量的平衡性，极大地提高了并行空间数据库的处理效率。  相似文献   

图形显示和比较古水流数据的一种软件(PC99):以青藏高原北部可可西里盆地新生代古水流数据为例     

刘志飞 《沉积学报》2002,20(2):354-358

PC99是基于Windows 95 / 98/ 2 0 0 0版本操作系统的VisualBasic语言程序,以简单和友好界面图形显示、统计分析和比较古水流数据文件。这种软件支持的古水流数据显示方式包括玫瑰花图和环形图两种,玫瑰花图的花瓣宽度和半径比例尺的可调节性可以辅以解释古水流分布样式,环形图可以同时装载、显示和比较 10个单组或合成古水流数据文件。本文以青藏高原北部可可西里盆地新生代沉积的古水流数据为例,分析古水流方向的时空分布特征,表明PC99是图形显示和解释古水流数据的一种高效软件工具。  相似文献   

Toward the optimization of PC-based training     

Kohei Cho  Shunji Murai 《ISPRS Journal of Photogrammetry and Remote Sensing》1997,52(6):247-252

Since 1992, the National Space Development Agency of Japan (NASDA) and the Economic and Social Commission for Asia and the Pacific (ESCAP) have been co-organising the Regional Remote Sensing Seminar on Tropical Ecosystem Management (Program Chairman: Prof. Shunji Murai) every year in some country in Asia. In these seminars, the members of the ISPRS Working Group VI/2 ‘Computer Assisted Teaching’ have been performing a PC-based hands-on-training on remote sensing and GIS for beginners. The main objective of the training was to transfer not only knowledge but also the technology of remote sensing and GIS to the beginners. The software and CD-ROM data set provided at the training were well designed not only for training but also for practical data analysis. This paper presents an outline of the training and discusses the optimisation of PC-based training for remote sensing and GIS.  相似文献   

缓坡地形上非线性波浪变形的并行计算          下载免费PDF全文

郑永红  游亚戈  沈永明  吴必军 《水科学进展》2003,14(3):328-332

基于椭圆型缓坡方程和消息传递接口机制,提出了缓坡地形上非线性波浪变形的一种并行数值模拟方法,并在微机群集并行系统上进行了数值实现.对一种典型缓坡地形上的非线性波浪传播变形进行了数值模拟,数值结果与实验数据的比较表明,在椭圆型缓坡方程中应用非线性波色散关系可有效考虑波浪的非线性效应,同时从获得的并行效率和并行加速比来看,并行数值方法可有效提高数值模拟效率.  相似文献   

基于PC/104平台Linux内核启动过程分析     

刘志勇 《海洋技术学报》2003,22(3):85-90

基于PC／104平台的嵌入式Linux技术在海洋自动观测系统中具有广泛的应用前景，Linux内核启动过程的分析是嵌人式Linux系统研究的基础。文章就Linux内核在PC／104单片机上的启动过程进行分析与研究。  相似文献   

预制空心板受火后力学性能的试验研究   总被引：1，自引：0，他引：1  

全威  ;张富文  ;许清风  ;韩重庆 《地震学刊》2012,(Z1):82-86

为比较不同受火时间后预制空心板剩余承载力、跨中挠度和破坏形态的异同,进行了6块预制空心板受火后力学性能的对比试验研究,其中3块为未受火的对比试件,另3块为板底分别受火23、38、53min的试件。受火试验结果表明,各试件在升温过程中的跨中挠度随受火时间增加而显著增加,熄火自然冷却后,跨中挠度大部分可恢复。加载试验结果表明,对比试件和受火试件的最终破坏模式均为弯曲破坏;随着受火时间延长,试件开裂荷载和破坏荷载均有所降低,且破坏荷载与受火时间大致呈线性关系;受火试件初始弯曲刚度较对比试件明显降低,相同荷载作用下,受火试件受拉边缘拉应变和受压边缘压应变,均明显大于对比试件。  相似文献   

Planview Geometry and morphological characteristics of pocket beaches on the Catalan coast (Spain)     

D. Bowman  J. Guilln  L. Lpez  V. Pellegrino 《Geomorphology》2009,108(3-4):191-199

Coastal planform studies are a relevant initial stage before launching detailed dynamic field experiments. The aim of this study is to define the planform characteristics of 72 Catalan pocket beaches, natural and man-made, and to determine their sheltering effect, embaymentization and their status of equilibrium. Planform measurements were performed on SIGPAC, 1:5000 orthophoto sets and wave climate was provided by Puertos del Estado (Wana model). Planform parameters were applied and coastal planview indexes were determined.The study shows that the Catalan pocket beaches display a wide range of indentation, suggesting that no single structural, tectonic or morphological control dominates their planform. The man-made pocket beaches typically display indentations which are smaller than those shown by natural pocket beaches. Headland spacing and beach area are positively correlated. The more indented bays are, the shorter their beaches become. Low-indented pocket beaches are the widest and the longest ones.Deep indentation contributes towards beach protection and energy dissipation which counteracts rip efficiency and inhibits the formation of mega-rips. Pocket beaches often show gradual and moderate alongshore changes in texture and beach morphology. One third of the Catalan pocket beaches are “sediment starved”, i.e., 60% and more of their embayed shorelines are deprived of beach sediments. Examination of the status of equilibrium demonstrates that most of the Catalan pocket beaches are in an unstable mode, with indentation ratios that are unrelated to the wave obliquity.  相似文献   

网络化地电阻率仪的研究   总被引：1，自引：1，他引：0       下载免费PDF全文

王兰炜  赵家骝 《地震学报》2008,30(5):484-490

地震观测仪器技术的发展与计算机技术的发展密切相关. 近年来, 集PC机功能于一体的嵌入式PC104模块得到了广泛的应用, 给设计人员提供了一种全新、 灵活的硬件设计环境. 本文介绍了采用低成本、高可靠性的嵌入式PC104模块实现地电阻率仪网络化的方法和网络化仪器主要功能.   相似文献   

Intelligent seismic isolation system using air bearings and earthquake early warning     

Satoshi Fujita  Keisuke Minagawa  Go Tanaka  Haruo Shimosaka 《Soil Dynamics and Earthquake Engineering》2011

Recently strong seismic waves or long period seismic waves have been observed in various earthquakes that occurred in Japan. As a result improvements of existing seismic isolation systems are deemed necessary. The present study proposed an intelligent seismic isolation system encompassing air bearings and earthquake early warning (EEW) system. Such system exhibits adequate isolation performance. The air bearings are isolation device that may render infinite the superstructure natural period by floating them, and the EEW is applied for a trigger of isolation. This paper illustrates the proposed system and discusses the experimental results of a test carried out with the system. Laboratory tests carried out in the present research demonstrate the effectiveness of the proposed base isolated systems and prove its efficacy in mitigating the effects of three-dimensional seismic waves. For example, the system suppressed the horizontal response acceleration of an isolation target to 38% of input acceleration.  相似文献