基于Web的溢油仿真系统的研究

海上溢油的危险系数越来越高,给生态环境和经济发展带来巨大威胁.为更好地防范海上溢油,提出一种基于Web的溢油仿真系统.采用系统仿真能力强大的Matlab和简化溢油模型,用Matlab Web Server构建B/S模式的服务器,提供方便快捷的海上溢油仿真分析.实践表明,该系统使用便捷、可扩展性较好.     

海上溢油监测系统综述

世界各国都特别注意保护海洋环境和环境,我国的海上活动变得越发活跃,交通量急剧增加,大型船舶,油轮和集装箱船的装箱量将超过10,000个,同时也成为了一有事故较多的国家。溢油型船会导致严重的溢油污染事故,例如10,000吨的石油流入,将导致不可逆转的环境灾难和巨大的经济损失。因此,在石油开发过程中,有必要加强海上航行的安全性,提高处理溢油事故的能力,这也成为海上石油开发的重要任务之一。我们密切监控溢油,以正确应对和解决环境中污染海上溢油的迅速恶化,提高我们应对污染事件并减少环境破坏的能力。有效的管理措施可以降低经济和环境的损害,这对于实现保护海洋环境的目标是必要的。     

海洋水文气象预警系统的设计方案

海洋环境对于海上从业人员以及相关海上作业的设备安全具有重要影响,每年因恶劣天气造成的海上事故不计其数,因此做好海洋水文气象的预警工作显得尤为重要。本文根据海洋环境的特点,提出了一种海洋水文气象预警系统的设计方案,该方案由数据采集、数据处理以及发布系统三部分组成,实现海洋环境参数的实时更新,并具有良好的通信性能和电源供给能力,能够在恶劣的环境下正常可靠工作,对于海洋安全具有重要意义。     

面向智慧城市的智慧公交监管平台设计

智慧公交在智慧城市中占有重要地位,但在运营过程中却缺乏有效监管,为此设计智慧公交监管系统。首先进行总体设计,从系统角度出发,设计系统架构;基于Java的B/S(浏览器/服务器)体系设计软件技术路线架构。然后进行系统功能设计,基于GIS(地理信息系统)设计地图展示子系统,实现监管信息在地图上的展示;首次引入GPS/BDS(全球定位系统/北斗卫星导航系统)双模方式,系统支持在GPS与BDS之间切换,设计车辆实时定位监管子系统,实现车辆的位置监控和信息查询。该系统对提高智慧公交运行水平具有重要意义。     

基于三维激光雷达的无人船障碍物自适应栅格表达方法

针对无人船(USV)海上近距离实时性避碰检测的需求,提出一种基于三维激光雷达的USV障碍物自适应栅格表达方法。根据USV周边环境障碍物的激光雷达点云分布,建立障碍物密集度和障碍物表达时间与栅格地图分辨率之间的函数关系,自适应确定适中的地图分辨率,构建栅格地图;对三维激光雷达点云数据进行降维处理,将三维激光雷达点云投影到栅格地图,减小数据量,提高障碍物检测效率。利用三维激光雷达开展方法验证性实验,获取了三种不同障碍物场景的激光雷达点云数据。处理结果显示:环境中障碍物数量越多,获得的期望栅格地图分辨率越高,障碍物表达更精细;反之,障碍物数量越少,获得的期望栅格地图分辨率越低,障碍物表达更快速,可实现障碍物自适应栅格表达。所建立的方法可为后续USV局部避碰路径规划研究提供支撑。     

G/S模式下Android地理信息浏览器缓存技术研究

为了研究G/S(geographic information browser/ distributed spatial data servers)模式客户端动态聚合服务,提出了一种在Android系统下基于G/S模式的地理信息浏览器缓存技术。利用移动终端硬件与软件技术的发展优势,将缓存结构分为3部分：用于存储显示地图瓦片的显示缓存,用于预存取的预存取缓存和由SQLite数据库管理的外部缓存。测试结果表明,该技术在提高地图瓦片加载速度的同时消除了移动终端在访问空间数据时的网络瓶颈。     

基于Dual-EndNet的全极化SAR溢油检测算法

海上溢油事故的发生不仅给人类造成了巨大的财产经济损失，而且严重破坏了海洋生态环境。极化合成孔径雷达（PolSAR）通过利用多种极化通道能够更综合地记录地物后向散射信息，从而广泛应用于海上溢油检测中。为了更加准确地进行海上溢油检测，提出一种基于Dual Encoder-Decoder Net(Dual-EndNet)的极化SAR海上溢油检测算法。首先提取出目前常用的30种用于溢油检测的极化特征，并利用随机森林算法选出区分溢油重要性较好的前10个特征；然后以编码器-解码器为基本框架，设计两个分支，分别输入PauliRGB图像和优选的10个极化特征图像，用于提取溢油极化SAR图像的空间信息和极化信息，进而对两分支信息进行融合，以提高溢油检测算法性能。在两景Radarsat-2全极化SAR溢油数据集上的实验结果表明，所提方法不仅具有较强的溢油检测能力，而且能够有效地区分原油、植物油、乳化油不同类型的油膜。     

表面等离子体共振海上溢油预警实验装置设计

为了实现对早期、小规模溢油检测及预警, 采用对外界介质折射率微小变化敏感的表面等离子体共振传感技术, 设计搭建了一套小型溢油检测实验装置, 创建了一个基于表面等离子体共振设计的GUI界面用于选取传感参量, 并通过C++编译了一套具有数据采集、存储、处理以及显示功能的软件用于数据处理以及提前预警, 进行了理论分析和实验验证, 取得了折射率为1.4451, 1.4774, 1.5299的原油样品的表面等离子体共振响应数据。结果表明, 实验数据与仿真结果相符, 该装置可用于海上溢油检测实验研究, 其软件设计满足预警需求。这一结果对海上溢油检测是有帮助的。     

基于GPRS/GPS的海上溢油远程无线监测系统

为了实时准确地监测溢油位置和漂移轨迹,介绍了一种以通用分组无线业务(General Packet Radio Service,GPRS)为通信方式传输全球定位系统(Global Positioning System,GPS)定位信息的海上溢油远程监测系统。通过实验表明,监测中心通过GPRS可以实时显示GPS浮标的经纬度、速度、方向的定位信息,并由地理信息系统(Geographical Information System,GIS)界面平台实现对溢油位置实时定位追踪显示,供溢油应急指挥决策使用。     

电容传感器集油箱油位测量系统的设计

基于海上溢油回收的特殊环境,该文设计了一种基于AT89S51单片机的海上液位测量系统。该系统采用分段电容检测的原理,以实现油水双液位的检测。合理搭建了微小电容测量的硬件电路并对单片机控制进行了软件编程。实验证明,该系统可以准确无误地应用于海上油位的测量。     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first     

JOURNAL OF ELECTRONICS(CHINA)

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NEXT GENERATION WIRELESS NETWORKS–ESPECIALLY THE USE OF MILLI-MICROWAVE BANDS

The global bandwidth shortage of wireless communications has motivated the exploration of the naillimeter wave （ram-wave） frequency spectrum for the next generation wireless communications. Recent advances in RF CMOS technology and high speed baseband signal processing technologies have enabled tile extensive research and development of turn-wave wireless communications. The multi gigabit per second data rate of ram-wave system will lead to applications in many important scenarios, such as WPAN, WLAN,back-haul for cellular system. And the frequency bands include 28 GHz, 38 GHz, 45GHz, 60GHz, E-BAND and even beyond 100 GHz. The propagation and the imitation of the RF circuits design in these frequency bands make the directional antennas be inevitable for mm-wave communications.