Accelerating BPC-PaCo through Visually Lossless Techniques

Fast image codecs are a current need in applications that deal with large amounts of images. Graphics Processing Units (GPUs) are suitable processors to speed up most kinds of algorithms, especially when they allow fine-grain parallelism. Bitplane Coding with Parallel Coefficient processing (BPC-PaCo) is a recently proposed algorithm for the core stage of wavelet-based image codecs tailored for the highly parallel architectures of GPUs. This algorithm provides complexity scalability to allow faster execution at the expense of coding efficiency. Its main drawback is that the speedup and loss in image quality is controlled only roughly, resulting in visible distortion at low and medium rates. This paper addresses this issue by integrating techniques of visually lossless coding into BPC-PaCo. The resulting method minimizes the visual distortion introduced in the compressed file, obtaining higher-quality images to a human observer. Experimental results also indicate 12% speedups with respect to BPC-PaCo.     

CGCS2000与WGS84之间转换的研究

坐标系统是在海洋石油勘探过程中基础的技术支撑,对采集的数据与现有数据的匹配、处理及融合等都会产生影响。本文对CGCS2000的基础参数和特点进行介绍,将WGS84与CGCS2000进行对比,根据现有的转换模型,对两者之间的转换参数进行研究。     

控制点CGCS2000坐标的联测及解求

CGCS2000坐标系是我国目前精度最高的坐标系,其推广使用具有重大意义。文中在安装并学习美国高精度GPS基线处理软件GAMIT软件基础上,以4个无坐标信息观测墩为例,进行观测数据采集与数据处理方案的设计,以期获取4个观测墩的CGCS2000坐标。最终结果表明,各质量指标均满足限差要求,且平差后最弱边中误差满足《工程测量规范》(GB50026-2007)三等工程控制网的要求。     

关于项目建设中工程坐标与国家坐标转换的具体实施

本文主要研究是2000坐标系向80坐标系具体方法和实施步骤。     

儿茶酚–(胺)表面化学介导的一氧化氮催化释放涂层研究

目的 在316L不锈钢(SS)表面构建原位一氧化氮(NO)催化释放涂层,使其能特异选择性地抗凝血、抑制平滑肌细胞(SMCs)增生,从而促进内皮细胞(ECs)生长。方法 在弱碱性水溶液中,选用多巴胺(DA)和己二胺(HD)为前驱体,利用多巴胺邻二苯酚结构自聚合沉膜的能力、多巴胺与己二胺的酚–(胺)表面化学,通过简单的一锅法在316L SS表面构建富氨基粘附涂层DA/HD。再通过碳二亚胺化学交联反应,共价接枝螯合Cu²⁺的1,4,7,10–四氮杂环十二烷–1,4,7,10–四羧酸(DOTA),最后获得均匀且稳定的NO催化释放涂层(命名为Cu-DOTA@DA/HD)。结果 DA/HD涂层表面的氨基密度高达22 nmol/cm²,实现了Cu-DOTA的有效固定,其NO催化释放速率可达5.2×10^–10 mol/(cm²·min)。Cu-DOTA@DA/HD涂层显著地抑制了血小板的粘附和激活,也能有效抑制血栓的形成,其表面血栓总质量由316L SS的(40.3±10.3) mg降低至(3.0±0.4) mg。...     

The EC Directive on Drinking Water (EEC 80/778)

The background to and technical deficiencies of the EC Drinking Water Directive are discussed. Although the inadequacies of the Directive are becoming increasingly recognized, there is no doubt that it has had a major impact on the UK water industry, much of which will be beneficial in the long term. However, it has provided a significant challenge to water suppliers on technical and environmental issues, as well as in new areas such as publicity and customer awareness. The water industry should be seen to be responding to the situation vigorously and positively to meet the spirit of the Directive, whilst seeking technical refinements which will make it a more practicable piece of legislation for the future.     

矛盾的整合——彼得·埃森曼的罗马2000年教堂之城市视角解读

罗马2000年教堂是解构主义建筑师彼得·埃森曼的一项投标竞赛作品,虽未获胜,但建筑师在这个项目中,不但借由图解手段探讨了建筑主体自生成的可能性,同时还深入研究了基地特征,将城市外部空间肌理组织特质与建筑本体形态构成两相结合,为宗教建筑赋予了极具时代特征、地域特色的形态表征。该文即是从城市设计的角度,尝试对该作品进行解读,力图寻找到其隐含于其建筑设计思维逻辑中的理性成分。     

淮河特大桥抗震分析研究

采用SAP2000程序，对铁路淮河特大桥进行了反应谱分析和时程分析，分析表明地震力不控制主梁结构设计，但地震力直接作用于墩底，须对连续梁的墩底进行抗震应力验算，连续梁桥的支座承担较大剪力，建议采用抗震支座，以策安全。     

采用“欧洲规范3”对圆形空心截面钢拱的设计

讨论采用"欧洲规范3"对沿拱水平方向均布竖向荷载作用下的末端销接或固接的空心圆形横截面钢拱的设计方法,并提出了修正系数,以提高对此类拱结构设计的准确性。     

一种基于ADV212图像压缩的方法

高效的硬件图像压缩系统可以有效的减少图像数据的冗余度,在分析专用编解码芯片ADV212的基础上,设计了一种现场可编程门阵列(FPGA)组合ADV212的图像压缩系统,实现对720×288的静态图像进行JPEG2000压缩.FPGA用来实现时序控制和数据转换,ADV212则进行图像的压缩.本次实验主要是改变图像压缩倍数及小波变换级数,并采用峰值信噪比(peak signal to noise ratio,PSNR)和均方误差(mean squared error,MSE)两个参数来衡量压缩图像的质量.实验结果表明,该系统可实现图像的有效压缩,并且压缩倍数越大图像失真越严重,小波变换级数在3级以上时图像质量较好.