一种用于机载双天线InSAR系统的实时DEM生成方法及实现     

陈立福  林月冠  彭曙蓉  李红英 《中国科学院大学学报》2014,31(5):678-684

为满足实时地形测绘需求,从算法本质上解决运算量太大的问题,提出基于机载双天线InSAR系统的实时DEM生成算法.采用非线性ECS自配准成像算法,获取高精度配准的双通道SAR图像,省略了后续非常耗时的配准过程.对获取的双通道SAR图像,进行快速干涉滤波产生高质量干涉条纹,进而对该条纹采用基于密集残差点划分的快速相位展开算法,获得无缠绕干涉相位.对于传统非常耗时的参数定标问题,采用基于外部粗精度DEM数据的初始相位偏置实时估计算法,并结合在定标场获取的基线长度、基线倾角和绝对延迟时间等参数进行反演,实时获取DEM.通过算法实时性分析,给出硬件实现方案.实际InSAR数据处理结果验证了本算法的有效性.  相似文献   

粒子系统理论在三维实时场景渲染中的应用研究     

张桂花  王均 《大众科技》2011,(11):22-25

为了实时地再现实际战场场景,文章在深入研究了粒子系统理论基础之上,结合OSG和MFC技术,构建了三维实时战场场景,根据火控解算的弹道参数,逼真地模拟了炮弹从出膛到击中目标这一全过程,主要包括炮弹出膛时炮口的烟雾火光、炮弹运动轨迹、炮弹击中目标产生的爆炸效果。这种三维实时场景渲染技术解决了粒子系统模拟的逼真性和系统实时性的矛盾问题,改变了传统的二维观察方式,使指挥作战员获得了身临其境的直观感受,在未来信息战争中具有重要的指导意义。  相似文献   

在线咨询的现状与思考   总被引：15，自引：4，他引：11  

李黎  周从军  陈大健 《四川图书馆学报》2003,(5):27-29

论述了国内外在线咨询的发展状况，对国内高校开展的几种虚拟参考咨询方式进行了比较。根据西南交大图书馆在线咨询的实践，论述了开展在线咨询的必要性及对在线咨询存在的问题的思考。  相似文献   

基于自定义算法的远程控制实验系统设计     

韩澄宗  朱善安 《实验室研究与探索》2006,25(12):1526-1529

介绍了一种基于自定义算法的远程控制实验系统,该系统允许用户动态地加载自行设计的控制算法。又介绍了系统实现过程中至关重要的二次开发接口技术,并通过风摆控制系统的设计说明了利用二次开发接口技术进行自定义控制算法设计的步骤。  相似文献   

基于PROFIBUS-DP网络的温度监控系统     

胡耀军  鲍连升  操建华  马超 《十堰职业技术学院学报》2006,19(5):80-81

基于PROFIBUS-DP协议组成的总线网络,结合监控组态软件,对设备硬件及控制、运行界面进行组态,构建人机界面,组成实时监控系统。  相似文献   

植物多样性的分子生物学研究方法   总被引：4，自引：0，他引：4  

李运贤  李玉英  邢倩 《南阳师范学院学报》2005,4(9):52-56

植物多样性是生物多样性的基础，它的保护和可持续利用是维持全球经济健康发展、全球气候稳定的重要因素之一，也是保持我们赖以生存环境的重要内容。对植物多样性的分子生物学研究方法进行了综述，并着重介绍了分子标记的最新进展及其在植物多样性研究中的广泛应用。  相似文献   

应用型本科电子系统设计课程教学改革与实践     

董胜  浦珊珊  马东吉 《教育教学论坛》2020,(3):100-101

电子系统设计课程是电子信息工程本科专业重要的课程,课程的研究内容包括信号的产生、放大、采集、分析与处理。文章以电子信息类应用型本科专业转型及本科工程教育专业认证为背景,从电子系统设计课程教学质量监控实际问题出发,提出了具有自我监测与修正功能的双闭环实时动态反馈式教学网络架构,并将其应用于电子系统设计课程教学改革与实践,提升教学效果明显。  相似文献   

支原体衣原体性小儿肺炎的流行病学研究     

姚静婵  顾美  王桂兰 《金华职业技术学院学报》2001,1(1):63-64,75

对肺炎支原体(MP)、沙眼衣原体(CT)性肺炎进行流行病学的实验研究。采用痰MP、CT荧光定量PCR结合探针的体外DNA扩增和检测。MP-DNA感染阳性率为8.2%,CT-DNA感染阳性率为6.7%,两者混合感染阳性率为0.27%。小于1岁大于3岁年龄组比较MP感染阳性检出率(x2=28.72,P<0.01)和CT感染阳性检出率(x2=5.80,P<0.05)均有显著性差异。MP阳性检出率秋季与春季比较(x2=7.089,P<0.01);CT阳性检出率秋季与春季比较(x2=60.346,P<0.01)及夏季与春季比较(x2=28.1756,P<0.01)均有显著性差异。MP和CT易感年龄较传统的患病年龄有明显提前趋势,感染季节MP以秋季为主,CT以夏秋季为主。  相似文献   

Quantitative analysis of a panel of gene expression in prostate cancer——with emphasis on NPY expression analysis     

LIU Ai-jun  FURUSATO Bungo  RAVINDRANATH Lakshmi  CHEN Yong-mei  SRIKANTAN Vasanta  MCLEOD David G.  PETROVICS Gyorgy  SRIVASTAVA Shiv 《Journal of Zhejiang University. Science. B》2007,8(12)

Objective: To investigate molecular alterations associating with prostate carcinoma progression and potentially provide information toward more accurate prognosis/diagnosis. Methods: A set of laser captured microdissected (LCM) specimens from 300 prostate cancer (PCa) patients undergoing radical prostatectomy (RP) were defined. Ten patients representing "aggressive" PCa, and 10 representing "non-aggressive" PCa were selected based on prostate-specific antigen (PSA) recurrence,Gleason score, pathological stage and tumor cell differentiation, with matched patient age and race between the two groups.Normal and neoplastic prostate epithelial cells were collected with LCM from frozen tissue slides obtained from the RP specimens.The expressions of a panel of genes, including NPY, PTEN, AR,AMACR, DD3, and GSTP1, were measured by quantitative real-time RT-PCR (TaqMan), and correlation was analyzed with clinicopathological features. Results: The expressions of AMACR and DD3 were consistently up-regulated in cancer cells compared to benign prostate epithelial cells in all PCa patients, whereas GSTP1 expression was down regulated in each patient. NPY, PTEN and AR exhibited a striking difference in their expression patterns between aggressive and non-aggressive PCas (P=0.0203, 0.0284, and 0.0378, respectively, Wilcoxon rank sum test). The lower expression of NPY showed association with "aggressive" PCas based on a larger PCa patient cohort analysis (P=0.0037,univariate generalized linear model (GLM) analysis). Conclusion: Despite widely noted heterogeneous nature of PCa, gene expression alterations of AMACR, DD3, and GSTP1 in LCM-derived PCa epithelial cells suggest for common underlying mechanisms in the initiation of PCa. Lower NPY expression level is significantly associated with more aggressive clinical behavior of PCa; PTEN and AR may have potential in defining PCa with aggressive clinical behavior. Studies along these lines have potential to define PCa-associated gene expression alterations and likely co-regulation of genes/pathways critical in the biology of PCa onset/progression.  相似文献   

An integrated DBP for streams with (<Emphasis Type="Italic">m,k</Emphasis>)-firm real-time guarantee     

Zhi?WangEmail author  Ji-ming?Chen  You-xian?Sun 《浙江大学学报(A卷英文版)》2004,5(7):816-826

(m,k)-firm real-time or weakly hard real-time (WHRT) guarantee is becoming attractive as it closes the gap between hard and soft (or probabilistic) real-time guarantee, and enables finer granularity of real-time QoS through adjustingm andk. For multiple streams with (m, k)-firm constraint sharing a single server, an, on-line priority assignment policy based on the most recentk-length history of each stream called distance based priority (DBP) has been proposed to assign priority. In case of priority equality among these head-of-queue instances, Earliest Deadline First (EDF) is used. Under the context of WHRT schedule theory, DBP is the most popular, gets much attention and has many applications due to its straightforward priority assignment policy and easy implementation. However, DBP combined with EDF cannot always provide good performance, mainly because the initial, DBP does not underline the rich information on deadline met/missed distribution, specially streams in various failure states which will travel different distances to restore success states. Considering how to effectively restore the success state of each individual stream from a failure state, an integrated DBP utilizing deadline met/missed distribution is proposed in this paper. Simulation results validated the performance improvement of this proposal. Project supported by the National Natural Science Foundation of China (No.60203030) and Advanced Research Program of France-China (Nos. PRA S101-04, PRA S103-02)  相似文献