共查询到20条相似文献,搜索用时 109 毫秒
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大数据技术以云计算为主要技术依托,作为新兴的计算机技术具有高涵盖性、颠覆性等特点,其处理数据的过程主要包括数据采集、数据处理和集成、数据分析以及数据解释等流程。基于其主要特点以及技术依托,大数据技术被广泛应用于数据处理的过程中。针对大数据技术在数据处理过程中的应用,本文对其在信息采集与加工、虚拟资源调度、数据挖掘、数据信息的安全保障、数据解释等方面的应用展开了论述。 相似文献
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ZHONG Qiu-yan 《数字社区&智能家居》2008,(24)
从现行信息需求出发,介绍了数据集成技术发展的必要性,讨论了已有的数据集成技术,分析了这些技术的优缺点,介绍了网格技术、本体技术两个新的异构数据集成技术。在此基础上给出了本体技术和中间件相结合数据集成解决方案。最后,提出了数据集成方法的发展方向。 相似文献
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日新月异的数据库研究领域--数据库技术的回顾与展望 总被引:5,自引:1,他引:5
李建中 《计算机应用与软件》2003,20(11):13-18,50
本文回顾十年来数据库技术的进展和主要成就,包括面向对象的和对象关系的数据库系统、多媒体数据的支持、并行数据库、web数据集成与检索、三级存储器技术、数据仓库、数据挖掘、数据可视化技术。本文还讨论了影响数据库研究的三个重要趋势,即Internet/Web技术、程序逻辑和数据的统一管理技术、迅速发展的计算机硬件技术。最后,本文探讨了嵌入式数据库系统、未来的联邦数据库系统、未来数据库系统的体系结构、程序逻辑和数据统一管理技术、结构化和半结构化数据的集成技术等几个主要数据库研究新方向。 相似文献
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张燕 《计算机光盘软件与应用》2014,(19):97-99
随着物联网发展速度的不断加快,对海量数据处理技术也提出了更高的要求。物联网数据具有实时性、海量性与多态性、异构性等特点,因此其海量数据处理技术也具有一定的特殊性。针对物联网海量数据的新需求,本文首先对物联网数据海量性、异构性、数据多维性与数据关联性、实时性与动态化等特点进行了分析,在此基础上主要分析与研究了物联网海量数据处理的数据库技术,包括分布式内存数据库技术与分布式实时数据库技术两种。 相似文献
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数据可视化技术成为人们认识和了解世界的重要媒介,但数据可视化技术在职业教育领域应用不足,通过分析数据可视化技术在教学中应用现状,剖析数据可视化技术在课堂中应用流程、课堂数据的处理过程以及遇到的问题.为数据可视化技术在职业教育课堂中的应用提供理论支持. 相似文献
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Phase equilibria and thermodynamic properties of the KCl–K2CO3–NaCl–Na2CO3 system were analyzed on the basis of the thermodynamic evaluation of the KCl–NaCl,KCl–K2CO3,NaCl–Na2CO3,K2CO3–Na2CO3 and KCl–K2CO3–NaCl–Na2CO3 systems. The Gibbs energies of individual phases was approximated by two-sublattice models for ionic liquids and crystals. Most of the experimental information was well described by the present set of thermodynamic parameters. The lowest monovariant eutectic temperature in the KCl–NaCl–Na2CO3 system is located at 573 °C, with a composition of XNa2CO3=0.31,XKCl=0.35 and XNaCl=0.34. 相似文献
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E. Thandapani M. M. S. ManuelJ. R. Graef P. W. Spikes 《Computers & Mathematics with Applications》1998,36(10-12)
The authors consider the difference equations and where an > 0, qn > 0, and f: R å R is continuous with uf(u) > 0 for u ≠ 0. They obtain necessary and sufficient conditions for the asymptotic behavior of certain types of nonoscillatory solutions of (*) and sufficient conditions for the asymptotic behavior of certain types of nonoscillatory solutions of (**). Sufficient conditions for the existence of these types of nonoscillatory solutions are also presented. Some examples illustrating the results and suggestions for further research are included. 相似文献
δ(anδxn)=qnxn+1
δ(anδxn)=qnf(xn+1),
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The k-ary n-cube has been one of the most popular interconnection networks for massively parallel systems. In this paper, we investigate the edge-bipancyclicity of k-ary n-cubes with faulty nodes and edges. It is proved that every healthy edge of the faulty k-ary n-cube with fv faulty nodes and fe faulty edges lies in a fault-free cycle of every even length from 4 to kn − 2fv (resp. kn − fv) if k ? 4 is even (resp. k ? 3 is odd) and fv + fe ? 2n − 3. The results are optimal with respect to the number of node and edge faults tolerated. 相似文献
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A new Mn(II) complex of MnL2Cl2 (L = azino-di(5,6-azafluorene)-κ2-NN′) was synthesized and utilized as an electrochemical indicator for the determination of hepatitis B virus (HBV) based on its interaction with MnL2Cl2. The electrochemical behavior of interaction of MnL2Cl2 with salmon sperm DNA was investigated on glassy carbon electrode (GCE). In the presence of salmon sperm DNA, the peak current of [MnL2]2+ was decreased and the peak potential was shifted positively without appearance of new peaks. The binding ratio between [MnL2]2+ and salmon sperm DNA was calculated to be 2:1 and the binding constant was 3.72 × 108 mol2 L−2. The extent of hybridization was evaluated on the basis of the difference between signals of [MnL2]2+ with probe DNA before and after hybridization with complementary sequence. Control experiments performed with non-complementary and mismatch sequence demonstrated the good selectivity of the biosensor. With this approach, a sequence of the HBV could be quantified over the range from 1.76 × 10−8 to 1.07 × 10−6 mol L−1, with a linear correlation of r = 0.9904 and a detection limit of 6.80 × 10−9 mol L−1. Additionally, the binding mechanism was preliminarily discussed. The mode of interaction between MnL2Cl2 and DNA was found to be primary intercalation binding. 相似文献
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Pranava K. Jha 《Information Processing Letters》2003,87(3):163-168
If r?1, and m and n are each a multiple of (r+1)2+r2, then each isomorphic component of Cm×Cn admits of a vertex partition into (r+1)2+r2 perfect r-dominating sets. The result induces a dense packing of Cm×Cn by means of vertex-disjoint subgraphs, each isomorphic to a diagonal array. Areas of applications include efficient resource placement in a diagonal mesh and error-correcting codes. 相似文献
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The diameter of a graph is an important factor for communication as it determines the maximum communication delay between any pair of processors in a network. Graham and Harary [N. Graham, F. Harary, Changing and unchanging the diameter of a hypercube, Discrete Applied Mathematics 37/38 (1992) 265-274] studied how the diameter of hypercubes can be affected by increasing and decreasing edges. They concerned whether the diameter is changed or remains unchanged when the edges are increased or decreased. In this paper, we modify three measures proposed in Graham and Harary (1992) to include the extent of the change of the diameter. Let D-k(G) is the least number of edges whose addition to G decreases the diameter by (at least) k, D+0(G) is the maximum number of edges whose deletion from G does not change the diameter, and D+k(G) is the least number of edges whose deletion from G increases the diameter by (at least) k. In this paper, we find the values of D-k(Cm), D-1(Tm,n), D-2(Tm,n), D+1(Tm,n), and a lower bound for D+0(Tm,n) where Cm be a cycle with m vertices, Tm,n be a torus of size m by n. 相似文献
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Amin Pourjabari Zanyar Esmailpoor Hajilak Alireza Mohammadi Mostafa Habibi Hamed Safarpour 《Computers & Mathematics with Applications》2019,77(10):2608-2626
This article investigates the influence of porosity on free and forced vibration characteristics of a nanoshell reinforced by graphene platelets (GPL). The material properties of piece-wise graphene-reinforced composites (GPLRCs) are assumed to be graded in the thickness direction of a cylindrical nanoshell and estimated using a nanomechanical model. In addition, because of imperfection of the current structure, three kinds of porosity distributions are considered. The nanostructure is modeled using modified strain gradient theory (MSGT) which is a size-dependent theory with three length scale parameters. The novelty of the current study is to consider the effects of porosity, GPLRC and MSGT on dynamic and static behaviors of the nanostructure. Considering three length scale parameters ( , , ) in MSGT leads to a better agreement with MD simulation in comparison by other theories. Finally, effects of different factors on static and dynamic behaviors of the porous nanostructure are examined in detail. 相似文献
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《国际计算机数学杂志》2012,89(10):1287-1293
A class of numerical methods is proposed for solving general third-order ordinary differential equations directly by collocation at the grid points x = x n+j , i = 0(1)k and at an off grid point x = x n+u , where k is the step number of the method and u is an arbitrary rational number in (x n , x n+k ). A predictor of order 2k ? 1 is also proposed to cater for y n+k in the main method. Taylor series expansion is employed for the calculation of y n+1, y n+2, y n+u and their higher derivatives. Evaluation of the resulting method at x = x n+k for any value of u in the specified open interval yields a particular discrete scheme as a special case of the method. The efficiency of the method is tested on some general initial value problems of third-order ordinary differential equations. 相似文献
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《Ergonomics》2012,55(10):1361-1371
The coefficient of rolling resistance (C r) for pneumatic tyres is dependent on hysteresis loss from tyre deformation which is affected by the vertical force applied to the tyres (F v) and the tyre inflation pressure (P r). The purpose of this paper was to determine the relative influence of five different levels of P r and four different levels of F v on C r and to examine the relationships of C r with P r and F v during cycling locomotion. F v was modified through carriage of additional mass by the subject. C r was determined with the coasting deceleration method from measurements performed in a level hallway. Iterations minimizing the sum of the squared difference between the actual deceleration distance and a predicted deceleration distance were used to determine C r. This latter distance was computed from a derivation based on Newton's second law applied to the forces opposing motion. C r was described by a hyperbolic function of P r (C r = 0.1071 P r ?0.477, r 2 = 0.99, p < 0.05), decreasing 62.4% from 150 kPa (Cr= 0.0101) to 1200 kPa (Cr = 0.0038). F v was related to C r by a polynomial function (C r = 1.92.10?8 F v 2 ?2.86.10?5 F v + 0.0142, r 2 = 0.99, p = 0.084), with an added mass of 15 kg (C r = 0.0040) resulting in an 11.4% increase in C r compared with no added mass (C r = 0.0035). From this study, it is concluded that the relationships of P r and F v with C r for cycling are non-linear. Furthermore, a simulation model shows that changes in P r and F v of the magnitude examined here have an important effect on competitive cycling performance. 相似文献
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Xie-Bin Chen 《Information Processing Letters》2010,110(16):625-560
Let Qn denote an n-dimensional hypercube with n?2, P be a path of length h in Qn and F⊂E(Qn)\E(P). Recently, Tsai proved that if 1?h?n−1 and |F|?n−1−h, then in the graph Qn−F the path P lies on a cycle of every even length from 2h+2 to n2, and P also lies on a cycle of length 2h if |F|?h−2. In this paper, we show that if 1?h?2n−3 and |F|?n−2−⌊h/2⌋, then in Qn−F the path P lies on a cycle of every even length from 2h+2 to n2, and P also lies on a cycle of length 2h if P contains two edges of the same dimension or P is a shortest path and |F∩E(Qh)|?h−2, where Qh is the h-dimensional subcube containing the path P. Moreover, the upper bound 2n−3 of h is sharp and the upper bound n−2−⌊h/2⌋ of |F| is sharp for any given h with 1?h?2n−3. 相似文献