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constrain cost
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  相似匹配句对
     cost.
     在资金的组织上,把主要精力放在低成本存款上。
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     On Investigation Cost
     论侦查成本
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     Component Commonality Effects on Invertory Cost with Service Level Constrain
     服务水平约束下通用件对库存费用的影响
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  constrain cost
Some of these would strengthen the institute's ability to constrain cost growth within the National Health Service.
      


Highly accurate spatial discretization is essentially required to perform numerical climate and weather prediction. The difference between the differential and the finite-difference operator is however a primitive error source in the numerics. This paper presents an optimization of centered finite-difference operator based on the principle of constrained cost function, which can reduce the truncation error to minimum. In the optimization point of view, such optimal operator is in fact an attempt to minimize...

Highly accurate spatial discretization is essentially required to perform numerical climate and weather prediction. The difference between the differential and the finite-difference operator is however a primitive error source in the numerics. This paper presents an optimization of centered finite-difference operator based on the principle of constrained cost function, which can reduce the truncation error to minimum. In the optimization point of view, such optimal operator is in fact an attempt to minimize spatial truncation er-rors in atmospheric modeling, in a simple way and indeed a quite innovative way to implement Variational Continuous Assimilation (VCA) technique.Furthermore, the optimizing difference operator is consciously designed to be meshing-independent, so that it can be used for most Arakawa-mesh configurations, such as un-staggered (Arakawa-A) or com monly staggered (Arakawa-B, Arakawa-C, Arakawa-D) mesh. But for the calibration purpose, the pro-posed operator is implemented on an un-staggered mesh in which the truncation oscillation is mostly ex-cited, and it thus makes a severe and indeed a benchmark test for the proposed optimal scheme. Both theo-retical investigation and practical modeling indicate that the aforementioned numerical noise can be significantly eliminated.

气候和天气数值预测本质上都需建立在离散空间的基础上,并要求有高精度的空间离散化计算方案。然而,解析性微分算子和离散性差分算子的差异却是造成数值计算的原始误差源。作者根据约束性代价函数原理提出了能够使得截断误差最小化的中心差分优化算子。从最优化角度看,该算子本质上是以一种简单但却相当创新的方式尝试应用变分连续同化(VCA)技术来最小化大气模式中的空间截断误差。此外,该优化差分算子的设计不依赖于网格结构,即可应用在绝大多数Arakawa网格上,诸如非跳点网格(Arakawa—A)以及常规跳点网格(Arakawa—B,Arakawa—C,Arakawa—D)。但为了对优化差分算子精确性进行严格测定,该算子的基准试验结果是通过在截断误差最易被激发出来的非跳点网格上进行严格理论和实际数值模拟测试得到的。两者的结果都表明该优化差分算子截断误差造成的数字噪音能被减小到最小量。

 
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