检索结果-南通市图书馆

Adaptive Algorithm for Accelerating Direct Isosurface Rendering on GPU

Journal of Electronic Science and Technology 2018年第3期16卷 222-231页

作者： Sergey Belyaev Pavel Smirnov Vladislav Shubnikov Natalia Smirnova the Department of Applied Mathematics Institute of Applied Mathematics and MechanicsPeter the Great St.Petersburg Polytechnic UniversitySt.Petersburg 195251 epam systems Inc. Newtown PA 18940

Direct isosurface volume rendering is the most prominent modern method for medical data *** is based on finding intersection points between the rays corresponding to pixels on the screen and isosurface. This article describes a two-pass algorithm for accelerating the method on the graphic processing unit(GPU). On the first pass, the intersections with the isosurface are found only for a small number of rays, which is done by rendering into a lower-resolution texture. On the second pass, the obtained information is used to efficiently calculate the intersection points of all the other. The number of rays to use during the first pass is determined by using an adaptive algorithm, which runs on the central processing unit(CPU) in parallel with the second pass of the rendering. The proposed approach allows to significantly speed up isosurface visualization without quality loss. Experiments show acceleration up to 10 times in comparison with a common ray casting method implemented on GPU. To the authors’ knowledge, this is the fastest approach for ray casting which does not require any preprocessing and could be run on common GPUs.

关键词： Adaptive algorithms isosurface rendering ray casting volume visualization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Wind Farm Support Vessel Extreme Roll Assessment While Docking in the Bohai Sea

引用

China Ocean Engineering 2021年第2期35卷 308-316页

作者： XU Xiao-sen Oleg Gaidai Oleh Karpa WANG Jun-lei YE Ren-chuan CHENG Yong Marine Equipment and Technology Institute Jiangsu University of Science and TechnologyZhenjiang 212100China School of Naval Architeture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China epam systems Ukraine School of Mechanical and Power Engineering Zhengzhou UniversityZhengzhou 450001China

Robust prediction of extreme motions during wind farm support vessel(WFSV)operation is an important safety concern that requires further extensive research as offshore wind energy industry sector *** particular,it is important to study the safety of operation in random sea conditions during WFSV docking against the wind tower,while workers are able to get on the *** is performed by thrusting vessel fender against wind tower(an alternative docking way by hinging is not studied here).In this paper,the finite element software AQWA has been used to analyze vessel response due to hydrodynamic wave loads,acting on a specific maintenance ship under actual sea *** roll may occur during certain sea conditions,especially in the beam sea,posing a risk to the crew transfer *** Bohai Sea is the area of diverse industrial activities such as offshore oil production,wave and wind power generation,*** paper advocates a novel method for estimating extreme roll statistics,based on Monte Carlo simulations(or measurements).The ACER(averaged conditional exceedance rate)method and its modification are presented in brief detail in *** proposed methodology provides an accurate extreme value prediction,utilizing available data *** this study the estimated return level values,obtained by ACER method,are compared with the corresponding return level values obtained by Gumbel *** on the overall performance of the proposed method,it is concluded that the ACER method can provide more robust and accurate prediction of the extreme vessel *** described approach may be well used at the vessel design stage,while defining optimal boat parameters would minimize potential roll.

关键词： wind farm support vessel(WFSV) docking Monte Carlo extreme roll Gumbel distribution offshore wind turbine wind energy Bohai Sea

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

哥伦比亚小水电发展报告--《世界小水电发展报告2016》国别报告(之十三)

引用

小水电 2018年第2期 6-7页

作者：欧内斯托·托里斯王旭军(译) 赵建达(校) epam DARE 水利部农村电气化研究所不详

1关键数据人口483295531面积1240192km2气候哥伦比亚位于赤道，安第斯山脉决定了其气候多变，亚热带气候干旱、炎热和干燥（2～6月），多雨、潮湿和温暖（6～11月），阴凉、干燥（11月至次年2月）。较高海拔地区平均温度低于12℃，低海... 详细信息

1关键数据人口483295531面积1240192km2气候哥伦比亚位于赤道，安第斯山脉决定了其气候多变，亚热带气候干旱、炎热和干燥（2～6月），多雨、潮湿和温暖（6～11月），阴凉、干燥（11月至次年2月）。较高海拔地区平均温度低于12℃，低海拔地区更暖和，平均温度18～24℃。地形每个地区的地形各不同，有高山、低谷、平原和海岸。北部是独立的圣玛尔塔内华达山脉（5775m），是哥伦比亚海拔最高的山峰。降雨年平均降水量500～3240mm，但各地每年变化大。最干燥的区域位于瓜希拉半岛的乌里维亚自治市，平均年降雨量267mm。巧克区最潮湿，每年降水超过9000mm。河流主要河流有马格达莱纳河、考卡河、卡克塔河、普图马约河、瓜维亚雷河、梅塔河和阿特拉托河。山区河流湍急，流经陡坡产生大量的水力发电潜能而且给通航河流增加了水量。

关键词：哥伦比亚小水电发展年平均降水量高海拔地区国别世界气候干旱平均温度

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：