检索结果-南通市图书馆

OpenMP compiler for distributed memory architectures

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science china(Information sciences) 2010年第5期53卷 932-944页

作者： WANG Jue , HU ChangJun, ZHANG Jilin & li JianJiang school of Information and Engineering, university of science and Technology beijing, beijing 100083, china 1. school of Information and Engineering University of Science and Technology Beijing Beijing 100083 China

OpenMP is an emerging industry standard for shared memory architectures. While OpenMP has advantages on its ease of use and incremental programming, message passing is today still the most widely-used programming model for distributed memory architectures. How to effectively extend OpenMP to distributed memory architectures has been a hot spot. This paper proposes an OpenMP system, called KLCoMP, for distributed memory architectures. Based on the "partially replicating shared arrays" memory model, we propose an algorithm for shared array recognition based on the inter-procedural analysis, optimization technique based on the producer/consumer relationship, and communication generation technique for nonlinear references. We evaluate the performance on nine benchmarks which cover computational fluid dynamics, integer sorting, molecular dynamics, earthquake simulation, and computational chemistry. The average scalability achieved by KLCoMP version is close to that achieved by MPI version. We compare the performance of our translated programs with that of versions generated for Omni+SCASH, LLCoMP, and OpenMP(Purdue), and find that parallel applications (especially, irregular applications) translated by KLCoMP can achieve more effective performance than other versions.

关键词： parallel compiling high performance computing distributed memory architecture OpenMP irregular application

PERFORMANCE EVALUATION OF SEVERAL FUSION APPROACHES FOR CCD/SAR IMAGES

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Geographical science 2003年第1期13卷 91-96页

作者： WANG Yan-li, CHEN Zhe(school of Automation science and Electrical Engineering, beijing university of Aeronautics and Astronautics, beijing 100083, P. R. china) school of Automation science and Electrical Engineering， beijing university of Aeronautics and Astronautics， beijing 100083， P. R. china

Several image fusion approaches for CCD/SAR images are studied and the performance evaluation of these fusion approaches is completed in this paper. Firstly, the preprocessing of CCD/SAR images before fusion is fulfilled. Then, the image fusion methods including linear superposition, nonlinear operator method and multiresolution methods, of which the multiresolution methods include Laplacian pyramid, ratio pyramid, contrast pyramid, gradient pyramid, morphological pyramid and discrete wavelet transform, are adopted to fuse two types of images. Lastly, the four performance measures, standard deviation, entropy, cross entropy and spatial frequency, are calculated to compare the fusion results by different fusion approaches in this paper. Experimental results show that contrast pyramid, morphology pyramid and discrete wavelet transformation in multiresolution approaches are more suitable for CCD/SAR image fusion than other ones proposed in this paper and the objective performance evaluation of CCD/SAR image fusion approaches are effective.

关键词： image fusion performance evaluation CCD image SAR image

Development on Technique of Tube Reducing in Double 3-Roll Dies

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2000年第1期14卷 55-57页

作者： Baolong Zheng li Sun Ruichen An , lianshi li Material science and Engineering school, university of science and Technology beijing, beijing 100083, china No. 1 Steel Rolling Factory, Tangshan Iron and Steel Corporation, Tangshan 063000, china Material science and Engineering school University of Science and Technology Beijing Beijing 100083 China No.1 Steel Rolling Factory Tangshan Iron and Steel Corporation Tangshan 063000 China

Based on the experiments, a new technique of reducing tube with two linked 3-roll roller dies was developed. The external friction conditions, velocity and the non-uniform deformation of metal were distinctly improved, and the friction between metal and tool was decreased. Corrosion strip layers and photo-elastic coatings methods were adopted in the experiment for measuring residual stress, and the residual stresses in the drawn tube with 3-roll dies are reduced.

关键词： reducing tube roller dies drawing deformation

Multi-swingby optimization of mission to Saturn using global optimization algorithms

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2009年第6期25卷 839-845页

作者： Kaijian Zhu Junfeng li Hexi Baoyin school of Aerospace, Tsinghua university,100084 beijing, china school of Aerospace Tsinghua University 100084 Beijing China

Based on the trajectory design of a mission to Saturn, this paper discusses four different trajectories in various swingby cases. We assume a single impulse to be applied in each case when the spacecraft approaches a celestial body. Some optimal trajectories ofEJS, EMS, EVEJS and EVVEJS flying sequences are obtained using five global optimization algorithms： DE, PSO, DP, the hybrid algorithm PSODE and another hybrid algorithm, DPDE. DE is proved to be supe- rior to other non-hybrid algorithms in the trajectory optimi- zation problem. The hybrid algorithm of PSO and DE can improve the optimization performance of DE, which is vali- dated by the mission to Saturn with given swingby sequences. Finally, the optimization results of four different swingby sequences are compared with those of the ACT of ESA.

关键词： Swingby trajectory . Global optimization .Hybrid algorithm . Mission design

Dynamic shielding of bacterial outer membrane vesicles for safe and efficient chemo-immunotherapy against tumors

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第2期17卷 836-847页

作者： Shuping li Xin li Jiaqi Meng Weier Bao Shuang Wang Peng ye Xiao-Dong Gao Wei Wei Key Laboratory of Carbohydrate Chemistry and Biotechnology Ministry of Education School of BiotechnologyJiangnan UniversityWuxi 214122China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China school of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

Bacterial outer membrane vesicles(OMVs)are potent immunostimulants of regulating the tumor microenvironment(TME)for immunotherapy,and can be used to deliver ***,the severe systemic inflammatory response triggered by OMVs upon intravenous(i.v.)injection has limited their ***,we developed a safe and effective strategy by conjugating doxorubicin-loaded serum albumin(SA-DOX,AD)onto the surface of OMVs using a matrix metalloproteinase(MMP)-cleavable peptide linker(cL).This approach enabled the dynamic shielding of OMVs to reduce the systemic side effects while simultaneously enhancing the anti-tumor effects through ***,the resulting OMV-cL-AD formulation exhibited significantly enhanced accumulation at the tumor site after ***,facilitated by the SA decoration on the OMVs ***,the shield on the OMV-cL-AD was cleaved by the over-expressed MMP in the TME,leading to the release of both OMVs and *** process provided OMV-induced immunotherapy and DOX-induced chemotherapy,resulting in synergistic tumor *** conclusion,our work demonstrated the potential of OMV-cL-AD as an effective immunochemotherapy strategy that can prolong the survival time of mice without inducing side effects.

关键词： outer membrane vesicles doxorubicin tumor microenvironment immunotherapy chemotherapy

On the bounds of frequency-selective channel capacity with doubly correlated geometrical MIMO channel 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

The Journal of china Universities of posts and Telecommunications 2010年第2期17卷 8-13页

作者： li Yong-hua , Lü Tie-jun, WU Xiao-fei, ZHANG lin Key Laboratory of Universal Wireless Communications, Ministry of Education, beijing university of posts and Telecommunications, beijing 100876, china [a] Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts Telecommunications Beijing 100876 China

The multi-input multi-output （MIMO） technology plays an important role in link transmissions. This article considers the general case for the ergodic capacity in doubly correlated frequency-selective MIMO channel. In the study, the geometrical MIMO channel model is presented. Based on the formula of MIMO ergodic capacity, the capacity limits are studied with arbitrary finite number of antennas in the frequency-selective MIMO channel. It first derives the exact expressions for the upper bound and lower bound in doubly correlated MIMO channel. The results for the single-ended correlation and independent identically distributed （i.i.d.） MIMO channel are also obtained as special cases. Then the simple expressions of the capacity bounds are attained at high SNR. Finally, results are provided by Monte Carlo simulations to verify the tightness of the derived bounds.

关键词： MIMO correlation capacity bounds

Effect of Gas Injection on Fluid Flow in Mold

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 1998年第1期12卷 16-19页

作者： Jiongming Zhang Wanjun Wang Jicheng He Baokuan li (Materials science and Engineering school, university of science and Technology beijing, beijing 1 00083, china)(Northeastern university, Xi’an, china) Materials science and Engineering school University of Science and Technology Beijing Beijing 100083 China Northeastern university Xi'an China

A mathematical and physical model was adopted to compute the fluid flow distribution in case of localgas holdup in mold. The photography was used to show the fluid field. The predicted flow patterns show. reasonableag... 详细信息

关键词： mold gas holdup fluid field

Strain distribution and electronic structures of the InAs/GaAs quantum ring molecule in an applied electric field

在线全文

学校读者我要写书评

暂无评论

science china(Physics,Mechanics & Astronomy) 2010年第9期53卷 1594-1599页

作者： JIA BoYong,YU ZhongYuan,liU YuMin,YAO WenJie,ye Han & FENG Hao Key Laboratory of Information Photonics and Optical Communications(beijing university of posts and Telecommunications),Ministry of Education,beijing 100876,china 1. Ministry of Education Key Laboratory of Information Photonics and Optical Communications (Beijing University of Posts and Telecommunications) Beijing 100876 China

The strain distribution and electronic structures of the InAs/GaAs quantum ring molecule are calculated via the finite element *** our model,three identical InAs quantum rings are aligned vertically and embedded in the cubic GaAs *** the band edge modification induced by the strain,the electronic ground state and the dependence of ground state energy on geometric parameters of the quantum ring molecule are *** change of localization of the wavefunction resulting from the applied electric field along the growth direction is *** ground state energy decreases as the electric field intensity increases in a parabolic-like *** electric field changes the monotonic dependence of the energy level on the inter-ring distance into a non-monotonic ***,the electric field has no effect on the relationships between the energy level and other geometric parameters such as the inner radius and outer radius.

关键词： strain distribution electronic structure quantum ring molecule applied electric field

Noise Effect on the 2D Stochastic Burgers Equation

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2024年第9期40卷 2065-2090页

作者： Zhao DONG Jiang Lun WU Guo li zhou RCSDS Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190P.R.China beijing Normal university-Hong Kong Baptist university United International College Zhuhai 519087P.R.China Guangdong Provincial Key Laboratory of Interdisciplinary Research and Application for Data science(IRADS) UICZhuhai 519087P.R.China school of Statistics and Mathematics Chongqing University Key Laboratory of Nonlinear Analysis and Its Applications(Chongqing university) Ministry of EducationChongqing 400044P.R.China

By comprehensive utilizing of the geometry structure of 2D Burgers equation and the stochastic noise,we find the decay properties of the solution to the stochastic 2D Burgers equation with Dirichlet boundary ***,the e... 详细信息

关键词： 2D stochastic Burgers equation regularity