oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 124 )

2018 ( 2686 )

2017 ( 2738 )

2016 ( 2875 )

Custom range...

Search Results: 1 - 10 of 124484 matches for " 赵士元 "
All listed articles are free for downloading (OA Articles)
Page 1 /124484
Display every page Item
基于GPU的大规模基因片段并行匹配的方法
The new approach of multiple genome sequence matching based on GPU

丁莎,,林涛
- , 2017,
Abstract: 后缀树和后缀数组广泛用于生物信息学领域中,特别是通过启发式算法在对DNA基因片段进行匹配的阶段。本文提出了在GPU 的平台下,利用多核和超多核体系构成的后缀树以及后缀数组并行匹配大规模基因片段,从而加速基因搜索匹配过程。相对于后缀树,后缀数组二分搜素算法具有内存占用少,缓存使用率高等优点。在GPU的性能评估中,后缀数组执行效率明显超过后缀树,后缀数组占用的空间仅为后缀树的20%―30%。相对于CPU的串行实现,后缀树组达到了约99倍的加速比。实验结果表明在基因片段匹配的过程中,基于GPU的后缀数组二分搜索是一种高效且实用的方法。
Suffix trees and suffix arrays have been used widely in bioinformatics applications, especially for DNA sequence alignments in the initial exact match phase of heuristic algorithms. In this paper, a new GPU implementation and optimization of the suffix tree and suffix array on both multi-core and many-core platforms to accelerate multiple genome sequence searching is presented. The comparative performance evaluation between the suffix tree and suffix array is then carried out. The results showed that the suffix array needed only 20?C30% of memory space compared with the suffix tree, and that the mean search time of the suffix array was significantly shorter than the mean search time of the suffix tree because of the use of a binary search with coalesced memory access and tile optimization under the GPU architecture. Moreover, the GPU implementation of the suffix array gained a speedup of approximate 99 times compared with the corresponding CPU serial implementation. This study showed that the massively parallel sequence matching algorithm based on suffix array was an efficient approach with the high-performance in the process of multiple DNA sequence matching
断层显微分辨率及其地震解释方法
,胡朝,程增庆
煤田地质与勘探 , 2004,
Abstract: 探讨了地震资料断层解释技术,提出了断层可视分辨率和显微分辨率的新概念,这有助于统一地质、物探和采矿专家的意见。文中指出在现有分辨率的地震资料基础上,经过解释处理及显示新技术,可以解释部分2~5m断距的断层。
CO2 浓度升高对两种沈阳城市森林树种光合特性的影响
王美玉,天宏,张巍巍,郭丹,何兴,
植物学报 , 2007,
Abstract: 利用开顶式气室, 研究了CO2浓度升高条件下城市森林主要树种油松(Pinus tabulaefomis)和银杏(Ginkgo biloba)主要光合特性的变化。结果表明, 整个生长季, CO2浓度升高(700 mmol.mol-1)条件下2树种叶片的净光合速率、可溶性糖、淀粉和可溶性蛋白含量均接近或高于相应对照(自然CO2浓度)值, 但不同树种增加的幅度不同; 而2树种的叶绿素含量和Chl a/Chl b值对CO2浓度升高反应不一, 表现为CO2浓度升高条件下油松的叶绿素含量较对照值高, Chl a/Chl b值降低, 银杏的叶绿素含量为前期升高, 后期降低, Chl a/Chl b值变化与之正好相反, 说明城市森林组成树种对CO2浓度升高的响应具有复杂性。CO2浓度升高条件下, 两树种均未发生光合适应现象。
多智能体最优持久编队动态生成与控制
罗小,, 关新平, 渊洁
自动化学报 , 2013, DOI: 10.3724/SP.J.1004.2013.01431
Abstract: ?研究了多智能体系统中最优持久编队生成算法,并根据对应的通信拓扑设计了最优持久编队的运动控制算法.首先,提出了基础圈概念,通过有向增加顶点操作,研究了基础圈为三角形或包含部分四边形的最优持久编队的分布式生成算法;在此基础上,考虑到持久编队中单向通信邻居的状态信息,设计了基于距离的最优持久编队运动控制算法.最后,仿真研究验证了所提算法的有效性.
CO2浓度升高对两种沈阳城市森林树种光合特性的影响
王美玉,天宏,张巍巍,郭丹,何兴,
植物学报 , 2007,
Abstract: ?利用开顶式气室,研究了CO2浓度升高条件下城市森林主要树种油松(Pinustabulaefomis)和银杏(Ginkgobiloba)主要光合特性的变化。结果表明,整个生长季,CO2浓度升高(700mmol.mol-1)条件下2树种叶片的净光合速率、可溶性糖、淀粉和可溶性蛋白含量均接近或高于相应对照(自然CO2浓度)值,但不同树种增加的幅度不同;而2树种的叶绿素含量和Chla/Chlb值对CO2浓度升高反应不一,表现为CO2浓度升高条件下油松的叶绿素含量较对照值高,Chla/Chlb值降低,银杏的叶绿素含量为前期升高,后期降低,Chla/Chlb值变化与之正好相反,说明城市森林组成树种对CO2浓度升高的响应具有复杂性。CO2浓度升高条件下,两树种均未发生光合适应现象。
膨化预处理玉米秸秆的还原糖酶解工艺
伦晓中,寇巍,,,熊菊,张大雷
环境工程学报 , 2013,
Abstract: 应用膨化技术对玉米秸秆进行预处理。在单因素实验基础上,以还原糖转化率为影响值设计正交实验,研究温度、pH、液固比、酶浓度及酶解时间五因素对纤维素酶解过程的影响。得出玉米秸秆糖化酶解最佳工艺条件为:温度48℃,pH4.5,液固比8∶1,酶浓度36.0U/g,酶解时间25h;在此工艺条件下还原糖转化率达到28.98%。扫描电镜表征对比观察可看出,膨化后玉米秸秆纤维素酶解充分;结合红外光谱对各组分特征基团分析表明,膨化后的玉米秸秆酶解的纤维素基团特征峰变化更为明显。
煤层气储层参数多信息综合定量预测方法
胡朝,彭苏萍,,程增庆
煤田地质与勘探 , 2005,
Abstract: 提出了以地震属性和钻孔测井参数为基础,以数学地质为桥梁,实现煤层气储层参数定量预测的科学方法。薄煤层厚与反射波振幅之间为单调增减关系公式;孔隙度与地震反射瞬时频率成正比关系,可采含气量与地震反射瞬时振幅成反比关系,且相关程度高。最后应用该成果对山西沁水煤层气地震勘探工程实际预测,对储层厚度、孔隙度、含气量做出定量预测。该成果有利于提高煤矿采煤安全性和降低煤层气开采的风险性,同时也将开拓地震勘探技术新的应用领域。
多智能体系统最优持久编队自动生成
罗小,,关新平,渊洁
控制理论与应用 , 2013, DOI: 10.7641/CTA.2013.20556
Abstract: 在最优刚性编队基础上,本文研究了多智能体系统的最优持久编队自动生成算法,所得算法能最大限度地减少维持编队结构稳定所需的信息交互量.首先,对于任意的最小刚性图,提出了缩减其范围的两种刚性逆操作;然后,设计了将包含于此两种操作中的无向边增加方向的规则,以使对应顶点的出度不大于2;并且在此基础上得到了任意最小持久图的生成算法,保证了最优持久编队的生成.最后,进行仿真研究,验证了提出算法的有效性.
w掺杂sio2介孔材料的制备与表征
,陈启,李洁,
物理化学学报 , 2007,
Abstract:
不滑移状态下深埋圆形隧道地震响应研究
Seismic Response of Deep-buried Circular TunnelsUnder No-slip Interface Conditions

,鹿庆蕊,,朱占,杜柳钢
- , 2017, DOI: 10.3969/j.issn.1000-0844.2017.06.1011
Abstract: 地下结构的地震响应主要取决于由地震波传播产生的土体变形与土结相互作用。剪切波传播过程中将会引起隧道衬砌的椭圆化变形,进而降低衬砌有效承载力。剪切波作用下的深埋圆形隧道可认为处于均质的纯剪状态,基于相对刚度法的拟静力解析解可充分考虑土结相互作用对隧道结构内力的影响。基于此,本文将通过有限元数值分析获得的自由场地地基变形引入不滑移状态下深埋圆形隧道内力求解公式,并结合二维和三维数值模拟途径,将动力分析结果与解析解结果进行对比分析,以评价各种解析方法的适用性和数值途径的可靠性。
The seismic response of underground structures is mainly determined by the soil deformation induced by seismic wave propagation and soil-structure interaction. The ovalization of tunnel lining during the process of shear wave propagation reduced the effective bearing capacity of lining. The resulting change of shape of tunnel section generates circumferential strains in the tunnel lining, which can cause cracking and/or crushing of concrete and reduce the carrying capacity of the lining. Since the dimension of a typical lining cross-section was small, in comparison to the wavelength of the dominant ground motion, and the inertial effects in both the lining and the surrounding soil were relatively small, therefore, the response of the cross-section induced by seismic motions could be considered as a response to an imposed uniform strain field. Transversal behavior is usually studied by analyzing the response of the cross-section to an imposed uniform strain field by using the pseudo-static approach. In general, most pseudo-static approaches are developed based on the relative stiffness method, which can take soil-structure interaction into account. In this paper, the available closed-form solutions under no-slip interface conditions (no relative shear displacement), which are developed based on the relative stiffness methods, were reviewed, and then the seismic response of a circular tunnel was analyzed, both analytically and numerically, in order to investigate the seismic response of tunnels subjected only to shear waves. The research is of great interest for evaluating the reliability of analytical solutions as well as the reliability of numerical approaches.
Page 1 /124484
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.