检索结果-南通市图书馆

维普期刊数据库博看期刊

Parallel-Dynamic Interpolation Algorithm of Sea Surface Height for Future 2D Altimetry mapping of Sea Surface Height

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2021年第5期20卷 1121-1135页

作者： DI Jiankai ma chunyong CHEN Ge College of Information Science and Engineering Ocean University of ChinaQingdao 266100China Laboratory for Regional Oceanography and Numerical Modeling Laboratory for Ocean Dynamics and ClimateQingdao National Laboratory for Marine Science and TechnologyQingdao 266237China

The sea surface height data volume of the future wide-swath two-dimensional(2D)altimetric satellite is thousands of times greater than that of nadir altimetric *** time complexity of the 2D altimetry mapping reaches O(n^(3)).It is challenging to map the global grid products of future 2D altimetric *** this study,to improve the efficiency of global data mapping,a new algorithm called parallel-dynamic interpolation(PA-DI)was *** the use of 2D data segmentation and fine-grained data mosaic methods,the parallel along-track DI processes were accelerated,and a fast and efficient spatial-temporal high-resolution and low-error enhanced mapping method was *** determined from a comparison of the single-threaded DI with the PA-DI,the new algorithm optimized the time complexity from O(n^(3))to O(n^(3)/KL),which improved the mapping efficiency and achieved the expected *** to the test results of the observing system simulation experiments,the PA-DI algorithm may provide an efficient and reliable method for future wide-swath 2D altimetric satellite mapping.

关键词： parallel computation data segmentation data mosaic dynamic interpolation wide-swath 2D altimetric satellite

The geometry of mesoscale eddies in the South China Sea: characteristics and implications

在线全文

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2021年第4期14卷 464-479页

作者： Guiyan Han Fenglin Tian chunyong ma Ge Chen Department of marine Technology Institute for Advanced Ocean StudyOcean University of ChinaQingdaoPeople’s Republic of China Qingdao National Laboratory for marine Science and Technology QingdaoPeople’s Republic of China

The symmetrical circular shape of mesoscale eddies has been widely used in their scientific ***,an elliptical average eddy shape has been confirmed for eddies in the global ocean using multi-satellite altimeter *** a regional extension of a previous study on the geometry of global eddies,a mean eddy shape in the South China Sea(SCS)has been derived by averaging a large number of orientational eddy *** mean shape is approximately a mathematic ellipse with a semimajor axis of 101.3 km and a semiminor axis of 61.3 *** size is larger than the global *** principal eddy orientation in the SCS is 74°/254°(nearly northeast-southwest),different from that of eddies in the global ocean(171°/351°,nearly east–west).Composite analyses of chlorophyll(CHL)concentrations and sea surface temperature anomalies(SSTA)indicate a dipole structure for circular eddies in the non-rotated coordinate *** a monopole structure for elliptical eddies in the eddy-centric coordinate system is *** results demonstrate that the elliptical shape of eddies affects oceanographical *** findings provide a new approach for exploring the role of air–sea interactions on oceanic eddies.

关键词： Mesoscale eddies eddy shape eddy orientation South China Sea

A Real-Time Photo-Realistic Rendering Algorithm of Ocean Color Based on Bio-Optical Model

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2016年第6期15卷 996-1006页

作者： ma chunyong XU Shu WANG Hongsong TIAN Fenglin CHEN Ge College of Information Science and Engineering Ocean University of China Laboratory for Regional Oceanography and Numerical Modeling Qingdao National Laboratory for Marine Science and Technology

Abstract A real-time photo-realistic rendering algorithm of ocean color is introduced in the paper, which considers the impact of ocean bio-optical model. The ocean bio-optical model mainly involves the phytoplankton, colored dissolved organic material （CDOM）, inorganic suspended particle, etc., which have different contributionsto absorption and scattering of light. We decompose the emergent light of the ocean surface into the reflected light from the sun and the sky, and the subsurface scattering light. We estab- lish an ocean surface transmission model based on ocean bidirectional reflectance distribution function （BRDF） and the Fresnel law, and this model＇s outputs would be the incident light parameters of subsurface scattering. Using ocean subsurface scattering algorithm combined with bio-optical model, we compute the scattering light emergent radiation in different directions. Then, we blend the re- flection of sunlight and sky light to implement the real-time ocean color rendering in graphics processing unit （GPU）. Finally, we use two kinds of radiance reflectance calculated by Hydrolight radiative transfer model and our algorithm to validate the physical reality of our method, and the results show that our algorithm can achieve real-time highly realistic ocean color scenes.

关键词： ocean color BRDF subsurface scattering bio-optical model

Satellite observed shape-based overall rotation—A new aspect in eddy kinematics

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2022年第5期41卷 183-194页

作者： Xueqing Yang Guiyan Han chunyong ma Chuanchuan Cao Jie Yang Ge Chen School of marine Technology Ocean University of ChinaQingdao266100China Laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao266237China Frontiers Science Center for Deep Ocean Multispheres and Earth System Ocean University of ChinaQingdao266100China

With the development of satellite altimetry technology,the resolution of sea-level anomaly(SLA)datasets is constantly *** spatial resolution levels can reach a grid size of(1/4)°×(1/4)°,with daily measurements that span from 1993 to 2018,allowing for the precise identification and tracking of individual *** the current study,in addition to the internal circulation and migration of eddies,a new aspect in eddy kinematics is revealed and investigated for the first time:shape-based overall eddy rotation(SOER),based on the intrinsic elliptical shape of eddies identified from a high-resolution SLA *** found that eddies can maintain an elliptical shape and a slow and stable SOER during their migration *** SOER speed was observed to be negatively correlated to eddy lifetime,and exhibited a dependence on latitude,decreasing from low-and high-to *** SOER direction tended to be consistent with the direction of internal circulation,particularly for long-lived *** addition,we identified a negative relationship between internal circulation speed and SOER speed while the migration speed was positively related to SOER *** findings further expand and improve eddy kinematics,which is of great significance for the future study of eddy dynamics.

关键词： mesoscale eddies shape-based overall eddy rotation(SOER) internal circulation eddy migration

在线全文

学校读者我要写书评

暂无评论

城市三维场景的逆过程式建模与混合渲染方法

计算机辅助设计与图形学学报 2015年第1期27卷 88-97页

作者：周圣川马纯永陈戈青岛市勘察测绘研究院青岛266033 中国海洋大学信息科学与工程学院青岛266100

针对大规模城市场景受制于数据规模,难以实现完整场景的视觉无损渲染的问题,提出一种基于过程式纹理重构和混合层次细节(LOD)模型的渲染方法.首先提取纹理中的重复与对称特征,构造纹理的过程式语法表示,实现了约70%的数据压缩,并且用户... 详细信息

针对大规模城市场景受制于数据规模,难以实现完整场景的视觉无损渲染的问题,提出一种基于过程式纹理重构和混合层次细节(LOD)模型的渲染方法.首先提取纹理中的重复与对称特征,构造纹理的过程式语法表示,实现了约70%的数据压缩,并且用户可以直接控制过程式语法的生成;然后通过几何模型采样创建点、线和多边形混合的LOD表示并编码存储;最后根据屏幕空间投影面积选择LOD模型进行渲染.实验结果表明,与原始模型和几何LOD方法相比,该方法分别实现了约10倍和5倍的渲染加速,可以实时渲染城市级大场景;在大幅度提高渲染效率的同时,基于72个个体样本的用户感知评价测试和基于动态范围无关算法的自动化测试结果证明,该方法渲染结果的视觉质量与原始模型相比无显著差异,是一种视觉无损渲染方法.

关键词：海量城市模型逆过程式建模层次细节模型混合渲染感知评价

基于Argo温度异常剖面的海洋涡旋无监督分类方法研究

在线全文

学校读者我要写书评

暂无评论

中国海洋大学学报（自然科学版） 2021年第8期51卷 96-105页

作者：林静马纯永陈戈中国海洋大学信息科学与工程学院山东青岛266100 青岛海洋科学与技术试点国家实验室区域海洋动力学与数值模拟功能实验室山东青岛266237

本文利用涡旋内温度异常剖面对黑潮延伸体区域的涡旋进行分类与分析。基于卫星高度计识别的涡旋数据和与涡旋时空匹配的Argo浮标温度异常剖面数据,本文提出了一种优化的高斯混合模型无监督聚类方法实现涡旋内Argo浮标温度异常剖面的自... 详细信息

本文利用涡旋内温度异常剖面对黑潮延伸体区域的涡旋进行分类与分析。基于卫星高度计识别的涡旋数据和与涡旋时空匹配的Argo浮标温度异常剖面数据,本文提出了一种优化的高斯混合模型无监督聚类方法实现涡旋内Argo浮标温度异常剖面的自动聚类,进而实现与剖面时空匹配涡旋的自动分类。实验结果表明,相同类型的Argo温度异常剖面呈现出明显的空间聚集效应,而不同类型的Argo温度异常剖面则在空间上相互分离,与表层(次表层)温度异常剖面相匹配的涡旋主要分布在黑潮延伸体的北部(南部)。相较于直接利用区域范围对涡旋进行分类的方法,本文所提出的涡旋分类方法更为客观,合成分析特定类型涡旋的水下结构也更为合理。

关键词：中尺度涡旋温度异常剖面 Argo剖面高斯混合模型无监督聚类黑潮延伸体

波浪驱动式海洋高频次精细化观测剖面仪的设计

在线全文

学校读者我要写书评

暂无评论

仪器仪表学报 2022年第1期43卷 120-126页

作者：杨杰王焱金萍萍马纯永陈戈中国海洋大学海洋技术学院青岛266100 青岛海洋科学与技术国家实验室区域海洋动力学与数值模拟功能实验室/“观澜号”海洋科学卫星工程部青岛266237

波浪驱动式海洋剖面观测平台具有自主升降、快速剖面、高时空分辨、长期连续的综合优势,对当前海洋中小尺度动力过程、浮游植物生理昼夜变化、生物地球化学循环等快变过程研究具有重要意义。自主设计并研制了一种完全由波浪驱动的海洋... 详细信息

波浪驱动式海洋剖面观测平台具有自主升降、快速剖面、高时空分辨、长期连续的综合优势,对当前海洋中小尺度动力过程、浮游植物生理昼夜变化、生物地球化学循环等快变过程研究具有重要意义。自主设计并研制了一种完全由波浪驱动的海洋剖面仪样机系统,于2021年8月8日~8月31日在青岛胶州湾海域以锚泊方式连续开展了23天海试,获取总剖面数2367个,平均每天102个,剖面平均周期8.19 min。结果进一步表明,在1级左右的低海况下,系统工作受潮流影响较大;而在2级以上的较高海况下,基本可以实现全天时连续工作,证明了自研波浪驱动式剖面仪样机具有良好的工作灵敏性、状态稳定性和机械耐受性,且设计成本只有国外同类产品价格的20%左右,为实现新型剖面观测平台的国产化目标迈出了关键一步。

关键词：波浪驱动剖面仪精细化观测国产化

基于VC/OpenGL的虚拟海大校园导航系统

在线全文

学校读者我要写书评

暂无评论

计算机辅助设计与图形学学报 2007年第2期19卷 263-267页

作者：陈勇马纯永陈戈中国海洋大学信息学院青岛266071

创建了一个方便直观的信息查询导航系统,具有基本的自主漫游和按固定路径漫游的功能,可按目的地自动地生成漫游路径、定位鸟瞰图、漫游中途经的楼宇和景点介绍等.

关键词：虚拟现实虚拟校园虚拟场景导航 OpenGL

从SSE到OpenCL:多核CPU上骨骼动画并行算法对比研究

在线全文

学校读者我要写书评

暂无评论

系统仿真学报 2015年第2期27卷 336-343,351页

作者：刘寿生陈戈马纯永韩勇中国海洋大学信息科学与工程学院青岛266100

拥有高精度蒙皮和复杂骨骼绑定关系的骨骼动画,渲染时存在很大的性能瓶颈。以往研究采用GPU加速动画,但高端GPU成本过高,而中低端GPU的通用计算性能有时不如高端CPU。为充分挖掘算法在多核CPU上的执行性能,弥补中低端GPU通用计算性能的... 详细信息

拥有高精度蒙皮和复杂骨骼绑定关系的骨骼动画,渲染时存在很大的性能瓶颈。以往研究采用GPU加速动画,但高端GPU成本过高,而中低端GPU的通用计算性能有时不如高端CPU。为充分挖掘算法在多核CPU上的执行性能,弥补中低端GPU通用计算性能的不足,提出了基于Open CL的针对指令和线程的新兴集成并行方案,并与基于SSE结合Open MP针对指令和线程的传统独立并行方案展开对比。实验结果表明,在多数CPU和多种复杂度的数据上,基于Open CL的新兴并行方案的性能明显高于基于SSE的传统并行方案,并且性能优势随着数据复杂度的增加而提升。

关键词：骨骼动画并行计算 Open CL SSE