Multiple Background Model-Based Moving Target Detection on Sea Surface

提出一种在反射光较强的条件下基于多背景模型的海面运动目标检测方法.使用基于统计模型的变化检测方法将被监控场景区分为海浪波动显著的背景区域和海浪波动不显著的背景区域;对这两种区域中的像素点分别以Weibull分布模型和Gauss分布模型建立背景模型;使用建立的背景模型检测海面的运动目标.实验结果表明,在海面反射光较强且波浪波动较大的情况下,用该方法可以比较准确地检测到海面的运动目标. A new method based on multiple background model for moving target detection on the sea surface is proposed. It can detect the moving target on the sea surface when there is heavy sea clutter and the reflected light is strong. The monitored area is first partitioned into two regions using the statistical model-based change detection method, where the sea clutter in one region is heavier than the other. Then Weibull distribution is used to create the background model for pixels in the region having heavier sea clutter and Gaussian distribution is used for the other region. Finally the background model is used to detect moving target on the sea surface. Experimental results show that the proposed method can detect moving target effectively even when the sea clutter is heavy and the reflected light is strong.国家自然科学基金资助项目(60175008);; 国家创新研究群体项目(60024301

Ships Tracking Based on Active Contour Model

将主动轮廓线模型用于海面运动船只的跟踪,提出了一种自动选择主动轮廓线初始控制点的方法,增强了主动轮廓线模型的实用性,并将基于主动轮廓线模型的跟踪方法用于多个海面运动目标的跟踪。实验结果表明,提出的初始主动轮廓线自动选取方法可以准确地选择目标的轮廓线的特征点;基于主动轮廓线模型的跟踪方法可以比较准确地跟踪运动船只的主要轮廓特征。This paper proposes a method based on active contour model to track the moving object on the sea surface,and a method for selecting the initial control points of the active contour automatically.And it uses the tracking method to track multi-ships moving on the sea surface.Experimental results show that the tracking method based on active contour model can track the ships’ contour effectively,and the method for selecting the initial points is excellent.国家创新研究群体基金资助项目(60024301);; 国家自然科学基金资助项目(60175008

Design and application of mechanical rotation pulse device for water depth and water level measurement

针对超声波、光电等水深水位传感器抗污染能力差,无法实现水深水位同时检测的问题,提出了一种机械式旋转脉冲水深水位测量装置,该测量装置分滚筒提升装置、夹紧装置和控制装置三部分。在重锤下降的过程中,通过实时检测光电编码器输出的旋转脉冲数可以得到重锤下降的位移、速度、加速度,找出重锤下降的加速度突变点,由此判断出蓄水池的水面和固液界面两个临界点,进而计算出蓄水池的水深、水位和沉淀物料厚度。测试结果表明:该装置抗污染能力强,在重锤为510 g、采样时间间隔为0.10 S时测量效果最佳,测量误差小于1%。A new type of mechanical rotation pulse measurement device is proposed,aiming at problem that ultrasonic and photoelectric sensors have poor ability to resist pollution and can't realize water depth and water level detection at the same time.The measurement device points cylinder lifting device,clamping device and control device.In falling process of heavy hammer,the downward displacement,velocity,acceleration of heavy hammer can be obtained through real-time detection on output rotation pulse number of photoelectric encoder.Then the two falling acceleration mutation points of heavy hammer can also be founded when heavy hammer gets into the water and arrives at the solid-liquid interface in a reservoir.Thus the reservoir water depth,water level and precipitation material thickness can be calculated.The measurement result shows that the pollution resistance capability of the device is strong and the water depth measurement error of the device is less than 1 % when the weight of heavy hammer is 510 g and the sampling time interval is 0.10 s.国家自然科学基金资助项目(U1204107;51475459); 河南省高等学校精密制造技术与工程重点学科开放实验室开放基金资助项目(PMTE201318A); 河南理工大学博士基金资助项目(B2012—101); 河南理工大学教改项目(2014JG061); 河南省教育厅科技技术研究重点项目(14B460033

Primary Exploration on Quality Evaluation of Holothurian Sold on the Market by HPLC Fingerprint

以10批不同产地刺参HPlC指纹图谱中的6个共有峰为评价指标,结合相似度分析,对不同刺参质量进行评价和检验。结果表明:不同批次刺参样品的6个色谱峰在指纹图谱分析过程中色谱行为相同,峰面积大,特征性强,能反映刺参的固有化学特征。结合相似度分析,可用于刺参质量评价。An optimized high performance liquid chromatography (HPLC) method was developed for the analysis of holothurian and the HPLC fingerprint was established from 10 batches of the holothurians from different habitats.The HPLC fingerprint showing 6 common characteristic peaks was used to explore the quality evaluation of holothurian and distinguish from the fakes with the similarity analysis.This method is accurate and reliable,providing a scientific basis for the quality control of holothurian and can be used to evaluate the quality of holothurian sold on the market.我国近海海洋综合调查与评价908专项(908-02-05-04):海洋药用生物资源评价和《中华海洋本草》编纂;海洋一所基本科研业务专项(GY-022008T32):海洋绿藻活性成分分析、鉴

Damage to mangroves from extreme cold in early 2008 in southern China

通讯作者Author for correspondence (E-mail: [email protected])2008年初,我国南方19个省经历了50年一遇的持续低温雨雪冰冻天气。极端气候对华南沿海各省的红树林区造成不同程度的危害。2008年3月,在我国南方各省红树林区的10个代表性地点,对这次寒害造成的红树植物伤害程度进行了系统的调查。结果表明:冬季低温对红树林的影响极为显著,特别是在低纬度的海南、广西和广东湛江,由于极端低温正值夜间退潮,对红树林的影响更为显著;在纬度较高的福建,本地红树种类秋茄(Kandelia obovata)、桐花树(Aegiceras corniculatum)和白骨壤(Avicennia marina)及引种的木榄(Bruguiera gymnorrhiza)等,由于长期适应于冬季较低的气温或在种植前经过抗寒锻炼,具有较强的抗寒能力。各地主要红树植物中,广布种秋茄、桐花树和白骨壤最为耐寒,其耐寒性均大于红树科的木榄、海莲(Bruguiera sexangula)和红海榄(Rhizophora stylosa)。海桑(Sonneratia caseolaris)对温度的敏感性最强,抗寒能力最低,因此,即使在其原产地海南也受到较为严重的寒害,在纬度更高的引种地出现大面积受害甚至全部死亡,而从孟加拉国引种的无瓣海桑(Sonneratia apetala)却显示出一定的抗寒能力。同一地点的红树植物幼苗的抗寒能力低于大树。此次寒害也造成了苗圃场的种苗大量死亡,成熟的植株提前落花落果,这势必会影响后继一两年内红树林的自然更新和人工造林。因此,在未来红树林造林或人工引种中,一定要考虑到红树植物的抗寒能力。国家自然科学基金(30671646和30700092);厦门大学“闽江学者”启动基

Research on the 2-D Barcode Applied in Information Security

二维条码本身具有高可靠性识读、编码保护源数据、身份识别、纠错等四种安全防伪特性。我们将二维条码与数字签名技术结合,建立了一种新的编译码方案。它能够提供访问控制、保密性、完整性、可用性和不可否认性五种安全服务,提高了安全级别,实现了数字签名的可视化和自动识读。The 2-D barcode has four security features: high-level reliable reading ability, encoding to protect o-riginal data, identification, and strong correcting ability. Furthermore, to design a new scheme needs to combine the 2-D barcode with the digital signature. It improves security and realizes the visualization and robotization of digital signatures. It also offers five services: access control, confidentiality, integrality, usability, and non-repudiation.国防基础科研项目(J1400B006

Optimizing Binary Field Arithmetics on DSP

主要研究二进制域运算在DSP上的实现。通过设置多个中间变量，实现了对数组的并行计算，将最佳正规基模乘算法提高到6级流水。重构almost inversion多项式基模逆算法结构，消除跳转语句，实现程序设计模块化。在TMS320C6201上执行113位和191位算法证实确实提高了模乘和模逆两种运算的速度。以循环移位取代乘法的模乘算法，限制了C6201的流水深度。This paper mainly discusses how to implement binary field arithmetics on DSP. By setting several middle variables, the parallel computation of arrays are implemented, which improves the streamline of optical normal basis modular multiplication method to six levels. The structure of polynomial basis modular inversion method, almost inversion, is reconstructed, and goto statements are deleted, to realize modularization of program design. It is proved that the speeds of modular multiplication and inversion method are both improved by performing 113 bits and 191 bits methods on TMS320C6201. The modular multiplication method, of which rotating shifts replace multiplications, limits the depth of C6201's streamline.国防基础科研项

飞行器襟翼局部热环境实验研究

针对高超声速飞行器襟翼模型,在中国科学院力学研究所GJF管风洞开展了气动热试验研究,试验条件为:来流马赫数Ma=4、5,攻角α=0°、10°,舵偏角δ=0°、10°、30°。试验采用平板模型,研究襟翼在不同舵偏角下的热流分布,给出了襟翼模型迎风面、拐角缝隙和拐角前方平板的热流分布试验结果。试验

Ships Detection Based on Gaussian Mixture Model

提出了一种基于变化检测的高斯混合模型参数估计方法,建立了象素点背景模型并用于海面运动目标的检测。在实验部分,将该方法估计的高斯混合背景模型的参数与基于迭代的EM算法估计的模型参数做比较,模拟实验的结果表明两者估计的参数值相差不大,而在对视频流中的象素点灰度值分布的逼近中,该文的方法比EM算法更接近真实的分布,并且在一定程度上减少了建立背景模型的所需的内存和计算时间。运动目标检测的结果表明,使用该方法建立的背景模型可以比较准确地检测到海面上的运动船只。This article proposes a parameter estimation method for Gaussian mixture model based on change detection,and uses the method to create background model for each pixel.And then uses the background model to detect the moving ships on the sea surface.The simulated experimental results show that the proposed method has the similar property with EM algorithm.But in the real experiments,the proposed method has better property than the EM algorithm.And the result of moving ships detection is satisfactory.国家自然科学基金(编号:60175008)资助项目;; 国家创新研究群体项目(编号:60024301

EXPERIMENTAL INVESTIGATIONS OF HYPERVELOCITY IMPACT ONTO ALUMINIUM DUAL-PLATE STRUCTURE

Dual-plate structure is very effective in the protection of space vehicle from hypervelocity im-pact.The experiments of A1 projectile impacting A1 dual targets at the velocity ranging over 2.5—7.0 km/swere systematically conducted.The damage effects were examined,including the perforation of the..