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GB/T 17703.3-1999国际物流政府管理报文 第3部分;普惠制原产地证明书报文International movement of goods governmental regulatory message--Part 3:Generalized system of preferences certificate of origin message
本标准规定了普惠制原产地证明书报文的定义和格式。本标准适用于各类具有进出口经营权的企业,就出口货物申请普惠制原产地证明书以及政府授权的签证机构签发普惠制原产地证明书的国内、国际间的电子数据交换。...
2022-06-06 09:06:46浏览:29
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Analysis of Network Traffic with Extreme Value Theory
It is very important to analyze network traffic in the network control and management. In this paper,extreme value theory is first introduced and a model with threshold methods is proposed to analyze the characteristics of network traffic. In this model, only some traffic data that is greater than threshold value is considered.Then the proposed model with the trace is simulated by using S-Plus software. The modeling results show the network traffic model constructed from the extreme value theory fits well with that of empirical distribution. Finally, the extreme value model with the FARIMA(p,d,q) modeling is compared. The analytical results illustrate that extreme value theory has a good application foreground in the statistic analysis of network traffic. In addition, since only some traffic data which is greater than the threshold is processed, the computation overhead is reduced greatly....
2020-12-06 21:11:24浏览:53
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Riemann problem for the zero-pressure flow in gas dynamics
The Riemann problem for zero-pressure flow in gas dynamics in one dimension and two dimensions is investigated. Through studying the generalized Rankine-Hugoniot conditions of delta-shock waves, the one-dimensional
Riemann solution is proposed which exhibits four different structures when the initial density involves Dirac measure. For
the two-dimensional case, the Riemann solution with two pieces of initial constant states separated at a smooth curve is
obtained....2020-09-15 12:28:59浏览:57
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Implicit Parallel FEM Analysis of Shallow Water Equations
The velocity field in the Wu River at Chongqing was simulated using the shallow water equation implemented on clustered workstations. The parallel computing technique was used to increase the computing power. The shallow water equation was discretized to a linear system of equations with a direct parallel generalized minimum residual algorithm (GMRES) used to solve the linear system. Unlike other parallel GMRES methods, the direct GMRES method does not alter the sequential algorithm, but bases the parallelization on basic operations such as the matrix-vector product. The computed results agree well with observed results. The parallel computing technique significantly increases the solution speed for this large-scale problem....
2020-07-08 08:49:41浏览:32
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