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Search Results: 1 - 10 of 36864 matches for " Qingshi Zhao "
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A unifiedO(logN) and optimal sorting vector algorithm
A Unified O(log N) and Optimal Sorting Vector Algorithm

Qingshi Gao,

计算机科学技术学报 , 1995,
Abstract: A unilied vector sorting algorithm (VSA) is proposed, which sorts N arbitrary num-bers with clog. N-bits on an SIMD multi-processor system (SMMP) with processors and a composite interconnected network in time, where c is an arbitrary positive constant. When is an arbitrary small posi-tive constant and u = log2 N, it is an O(logN) algorithm and when it is an optimal algorithm,pT = O(N log N)); where u = 1, c = 1 and e = 0.5 (a constant).

Zhao kun Hua Ling Huang Qingshi,

生物物理学报 , 1993,
Abstract: 关于栝楼核糖核酸酶的性质已经研究.它对核糖核酸和多聚尿嘧喧核苷酸所显示的酶活性,有很大的相似性:(1)栝楼核糖核酸酶的最适度应pH在5左右;(2)稳定的pH范围在5-12之间;(3)最佳反应温度为55℃左右;(4) 热稳定性:在15分钟内,60℃以下酶活性基本稳定,在65℃左右时大约有50%的活性丧失;(5)金属离子中,除CU~(2+)和Ag~+有明显的抑制作用外、一般作用不明显.另外,酸对其它合成的多聚核苷酸的水解作用,显示有碱基特异性;对双链RNA(CPV RNA)也显有活性.实验中未发现该酶有磷酸单酯酶的活性及降解DNA的活性.因此,该酶可能是一种具有碱基特异性的核糖核酸酶.
A Substitution Based Model for the Implementation of PROLOG——The Design and Implementation of LPROLOG
Chen Zhaoxiong,Gao Qingshi
计算机科学技术学报 , 1986,
Abstract: Since PROLOG has been chosen as the Fifth Generation Computer's Kernal Language,it ispresently one of the hottest topics among computer scientists all over the world.Recently,theimplementation technique and the application of PROLOG have been developed rapidly.In thispaper,a new implementation scheme for PROLOG is proposed.The scheme is based on thesubstitution of instantiated veriable values.It has many advantages,such as a higher runningspeed,less main memory requirement,and easier to be implemented.The scheme has beenimplemented by the authors on IBM4341.
K-Dimensional Optimal Parallel Algorithm for the Solution of a General Class of Recurrence Equations
Gao Qingshi,Liu Zhiyong
计算机科学技术学报 , 1995,
Abstract: This paper proposes a parallel algorithm,called KDOP (K-Dimensional Optimal Parallel algorithm),to solve a general class of recurrence equations efficiently.The KDOP algorithm partitions the computation into a series of subcomputations,each of which is executed in the fashion that all the processors work simultaneously with each one executing an optimal sequential algorithm to solve a subcomputation task.The algorithm solves the equations in O(N/P) steps in EREW PRAM model (Exclusive Read Exclusive Write Parallel Random Access Machine model) using p≤N^1-∈ processors,where N is the size of the problem,and ∈ is a given constant.This is an optimal algorithm (its sepeedup is O(p)) in the case of p≤N^1-∈.Such an optimal speedup for this problem was previously achieved only in the case of p≤N^0.5.The algorithm can be implemented on machines with multiple processing elements or pipelined vector machines with parallel memory systems.
Differential Requirement for Utrophin in the Induced Pluripotent Stem Cell Correction of Muscle versus Fat in Muscular Dystrophy Mice
Amanda J. Beck,Joseph M. Vitale,Qingshi Zhao,Joel S. Schneider,Corey Chang,Aneela Altaf,Jennifer Michaels,Mantu Bhaumik,Robert Grange,Diego Fraidenraich
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0020065
Abstract: Duchenne muscular dystrophy (DMD) is an incurable degenerative muscle disorder. We injected WT mouse induced pluripotent stem cells (iPSCs) into mdx and mdx:utrophin mutant blastocysts, which are predisposed to develop DMD with an increasing degree of severity (mdx <<< mdx:utrophin). In mdx chimeras, iPSC-dystrophin was supplied to the muscle sarcolemma to effect corrections at morphological and functional levels. Dystrobrevin was observed in dystrophin-positive and, at a lesser extent, utrophin-positive areas. In the mdx:utrophin mutant chimeras, although iPSC-dystrophin was also supplied to the muscle sarcolemma, mice still displayed poor skeletal muscle histopathology, and negligible levels of dystrobrevin in dystrophin- and utrophin-negative areas. Not only dystrophin-expressing tissues are affected by iPSCs. Mdx and mdx:utrophin mice have reduced fat/body weight ratio, but iPSC injection normalized this parameter in both mdx and mdx:utrophin chimeras, despite the fact that utrophin was compromised in the mdx:utrophin chimeric fat. The results suggest that the presence of utrophin is required for the iPSC-corrections in skeletal muscle. Furthermore, the results highlight a potential (utrophin-independent) non-cell autonomous role for iPSC-dystrophin in the corrections of non-muscle tissue like fat, which is intimately related to the muscle.
Remote Sensing Interpretation about Landform of Glacial Erosion at Quaternary Period in Eastern Side of the Southern Segment of Taihang Mountain

Guo Qingshi,

遥感学报 , 1991,
Abstract: The large are of glacial erosion landform is discovered by the interpretation on large scale white-black airphotos in the eastern side of the southern segment of the Taihang mountain. 3 to 4 glacial epochs of landform of glacier erosion are distinguished. The glaciers of first and second epoch are valley-piedmont glacier. Other landforms are cirque, hanging valley, firn-basin and trough, etc. The glacial stage, its distribution tyge and characteristic of glacier are described in this paper. This work provids new evidences for futher researching the glacier movement in quaternary period in this area.
Blastocyst Injection of Wild Type Embryonic Stem Cells Induces Global Corrections in Mdx Mice
Elizabeth Stillwell, Joseph Vitale, Qingshi Zhao, Amanda Beck, Joel Schneider, Farah Khadim, Genie Elson, Aneela Altaf, Ghassan Yehia, Jia-hui Dong, Jing Liu, Willie Mark, Mantu Bhaumik, Robert Grange, Diego Fraidenraich
PLOS ONE , 2009, DOI: 10.1371/journal.pone.0004759
Abstract: Duchenne muscular dystrophy (DMD) is an incurable neuromuscular degenerative disease, caused by a mutation in the dystrophin gene. Mdx mice recapitulate DMD features. Here we show that injection of wild-type (WT) embryonic stem cells (ESCs) into mdx blastocysts produces mice with improved pathology and function. A small fraction of WT ESCs incorporates into the mdx mouse nonuniformly to upregulate protein levels of dystrophin in the skeletal muscle. The chimeric muscle shows reduced regeneration and restores dystrobrevin, a dystrophin-related protein, in areas with high and with low dystrophin content. WT ESC injection increases the amount of fat in the chimeras to reach WT levels. ESC injection without dystrophin does not prevent the appearance of phenotypes in the skeletal muscle or in the fat. Thus, dystrophin supplied by the ESCs reverses disease in mdx mice globally in a dose-dependent manner.
Vector Computer 757
Gao Qingshi,Zhang Xiang,Yang Shufan,Chen Shuqing
计算机科学技术学报 , 1986,
Abstract: This paper describes briefly the first large-scale vector computer system designed andproduced in China——vector computer 757. The design philosophy, architecture, hardwareimplementation, software and performance of this computer are presented.
Linear scaling calculation of band edge states and doped semiconductors
H. J. Xiang,Jinlong Yang,J. G. Hou,Qingshi Zhu
Physics , 2006, DOI: 10.1063/1.2746322
Abstract: Linear scaling methods provide total energy, but no energy levels and canonical wavefuctions. From the density matrix computed through the density matrix purification methods, we propose an order-N (O(N)) method for calculating both the energies and wavefuctions of band edge states, which are important for optical properties and chemical reactions. In addition, we also develop an O(N) algorithm to deal with doped semiconductors based on the O(N) method for band edge states calculation. We illustrate the O(N) behavior of the new method by applying it to boron nitride (BN) nanotubes and BN nanotubes with an adsorbed hydrogen atom. The band gap of various BN nanotubes are investigated systematicly and the acceptor levels of BN nanotubes with an isolated adsorbed H atom are computed. Our methods are simple, robust, and especially suited for the application in self-consistent field electronic structure theory.
Geometrical, electronic and magnetic properties of Na$_{0.5}$CoO$_2$ from first principles
Zhenyu Li,Jinlong Yang,J. G. Hou,Qingshi Zhu
Physics , 2004, DOI: 10.1103/PhysRevB.71.024502
Abstract: We report a first-principles projector augmented wave (PAW) study on Na$_{0.5}$CoO$_2$. With the sodium ion ordered insulating phase being identified in experiments, pure density functional calculations fail to predict an insulating ground state, which indicates that Na ordering alone can not produce accompanying Co charge ordering, if additional correlation is not properly considered. At this level of theory, the most stable phase presents ferromagnetic ordering within the CoO$_2$ layer and antiferromagnetic coupling between these layers. When the on-site Coulomb interaction for Co 3d orbitals is included by an additional Hubbard parameter $U$, charge ordered insulating ground state can be obtained. The effect of on-site interaction magnitude on electronic structure is studied. At a moderate value of $U$ (4.0 eV for example), the ground state is antiferromagnetic, with a Co$^{4+}$ magnetic moment about 1.0 $\mu_B$ and a magnetic energy of 0.12 eV/Co. The rehybridization process is also studied in the DFT+U point of view.
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