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平均情况下
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  average case
     The multicast routing problem that finding the minimum cost multicast routing tree with many QoS constraints may be formalized to Steiner tree problem in network, which is a NP-complete problem that an algorithm that finds a Steiner tree can not get the best solution in polynomial time. Therefore, we would like to find approximation algorithms which can get a solution that close to optiumum in worst case and average case.
     寻找有多个QoS约束的最小代价组播路由树可以形式化为网络中的Steiner树问题,它是一个NP完全问题,在多项式时间内不能得到最优解,因此研究者所寻求的是一种次优的、在最差情况和平均情况下的性能都接近于最优的解决方案。
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     At last, the experiment data show that the new algorithm is much better than DFSA algorithm. For the average case, the time spent by new algorithm is only 70 33percent of that spent by the DFSA.
     实验结果显示 ,本算法明显优于DFSA算法 ,在平均情况下所花费时间仅为DFSA算法的 70 33%。
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  “平均情况下”译为未确定词的双语例句
     In this paper, we calculate 21 examples of horizontal wind power spectrum and cross-spectrum under different conditions. Data are obtained from 8 levels (100, 70, 50, 30, 20, 15, 10, 5m) on 104m meteorological tower which is situated at Badaling area of Beijing. The mean figures of power spectrum and cross-spectrum at 8 levels are presented in the frequency range from 2.25×10-4 to 0.5 cycles per second.
     根据北京八达岭地区104米气象塔上八个层次(100,70,50,30,20,15,10,5米)的梯度观测资料,计算了21个不同情况的大风个例的水平风功率谱和各层之间的交叉谱,给出了平均情况下频率范围,从约2.25×10~(-4)周/秒至0.5周/秒的各层的功率谱和交叉谱图。
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     (2) From 1980 to 2003, the average gross supply of groundwater is 221 million m3, while the average gross drainage is 234.1 million m3, 13.1 million m3 more than the former.
     (2)地下水多年平均(1980-2003年)总补给量为2.210亿m~3,相应的多年平均总排泄量为2.341亿m~3,多年平均情况下,总排泄量比总补给量多0.131亿m~3。
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     It is easily imple- mented on a shared-memory single instruction stream multiple data strearn(SIMD) com- putcr. It requires n / 2m processors and O(log(n/2m)logm·m) time in the worst and aver- age case, the cost of this algorithm is O(n/21og(n/2m)logm).
     该算法易于在基于共享内存的单指令流多数据流(SIMD)机器上实现,所需处理器数为n/2m,并行时间复杂性在最坏和平均情况下均为O(log(n/2m)logm·m),其并行执行代价为O(n/2log(n/2m)logm).
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     (2) In years with normal climatic conditions, soil water content in the later period of winter wheat only maintains the value about 30 percent of the field capacity and, in the middle period of spring corn maintains the value higher than 50 percent.
     (2)土壤干旱特征研究,在常年平均情况下,小麦后期土壤水分保持在田间持水量30%左右,玉米中期保持在田间持水量50%以上。
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     The realization of quicksort algorithm by using the language of Java was illustrated. The time complexity in the best,the worst and the average circumstance was analysed. The result shows that quicksort algorithm is superior in asymptotic meaning.
     首先阐述分治法的基本思想,其次应用分治与递归策略用Java语言实现快速排序算法,然后再用实例说明此算法的工作过程,最后分析了最好情况、最坏情况和平均情况下的时间复杂性,得出快速排序算法在渐进意义上最优.
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     MEAN STRESS AMENDING METHOD FOR FATIGUE UNDER COMPLEX LOADING
     复杂载荷情况平均应力修正方法
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     curves are 1. 5 classes higher in a stable and neutral situation and the average increase is one class in an unstable situation.
     不稳定情况平均高1级。
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     The Pricing Formula of Barrier Option Based on the Geometric Average Assets
     障碍期权推广到几何平均资产情况的定价公式
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     the longevity of adults without nutritional supplement was 2.5 days on average.
     成蜂在没有营养补充的情况平均存活2.5 d。
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     the longevity of adults without nutritional supplement was 2.5 days on average.
     成蜂在没有营养补充的情况,平均存活2.5天。
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  average case
The coprocessor implemented on XILINX XC2V3000 computes a point multiplication for an arbitrary point on a curve defined over GF(2192-264-1) with the frequency of 10 MHz in 4.40 ms in the average case and 5.74 ms in the worst case.
      
At the same circumstance, the coprocessor implemented on XILINX XC2V4000 takes 2.2 ms in the average case and 2.88 ms in the worst case.
      
This induces an algorithmic complexity of order O(N2)+O(MN) in worst and average case, N being the number of categories, and M the input dimension.
      
This paper presents both worst case and average case analysis of roundoff errors occurring in eight precomputation methods of twiddle factors.
      
In this paper, a definition of the optimization of operator equations in the average case setting is given.
      
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The meridional circulation along 120°E from 15°N-70°N have been computed daily for the summers of 1964-1965(180 days) and from the point of view of the mid and short-range weather processes, the day-to-day variations of the meridional circulation have been analysed. It is found that the variations of the meridional circulation have two marked different periods, i.e., the relative stable stage and vigorous adjustment stage.Further analysis points out that the adjustments of the meridional circulation have three...

The meridional circulation along 120°E from 15°N-70°N have been computed daily for the summers of 1964-1965(180 days) and from the point of view of the mid and short-range weather processes, the day-to-day variations of the meridional circulation have been analysed. It is found that the variations of the meridional circulation have two marked different periods, i.e., the relative stable stage and vigorous adjustment stage.Further analysis points out that the adjustments of the meridional circulation have three marked different types. By analysing the variations of the meridional circulation and their relation to the activity of the West-Pacific subtropical high on 500 mb level, we have found that the ridge line of the subtropical high is at the descending current in the meridional south anti-circulation.When the meridional circulation is in the relative stable stage, following the N-S oscillation of the meridional south anti-circulation, there appears correspondingly the N-S oscillation of the subtropical high.When the meridional circulation is in the vigorous adjustment stage, every type of adjustment is closely related to the great variation of subtropical high.Finally, we would like to point out that for the non-mean case, the great variations of the position of the subtropical high are not directly determined by the great variations of the position of the Hadley cell.

本文对1964和1965年二个夏季共180天,逐日地计算了沿着120°E从15°—70°N范围内的经圈环流,从中短期过程出发,分析了逐日的经圈环流演变特征,结果指出:经圈环流的演变具有二种明显不同的时期。即相对稳定期和剧烈调整期。进一步的分析指出:经圈环流的调整具有三种不同的方式。在分析经圈环流演变和副高活动间的关系后指出:副高位于南反环的下沉支;在经圈环流处于相对稳定期间,随着南反环的南北摆动,相应地副高也出现南北摆动现象,在经圈环流处于剧烈调整期间,每一种调整方式都和副高的显著变动紧密地联系着。最后还指出:在非平均情况下副高位置的显著变动并不是直接受哈特莱环流位置的显著变动所决定的。

In this paper the emphasis is focused on some physical processes through which the westward extension of the subtropical high is affected by the enhancement of the heating fidle over the West Pacific Prior to heavy rains. The calcu-lation and analysis of the three-dimensional structure of vertical circulation cell in this region show that a quasi- Walker circulation may appear over the West pacific under abnormal conditions, and that there obviously is an ascending air-current around 160°E and it becomes stronger...

In this paper the emphasis is focused on some physical processes through which the westward extension of the subtropical high is affected by the enhancement of the heating fidle over the West Pacific Prior to heavy rains. The calcu-lation and analysis of the three-dimensional structure of vertical circulation cell in this region show that a quasi- Walker circulation may appear over the West pacific under abnormal conditions, and that there obviously is an ascending air-current around 160°E and it becomes stronger within a few days before heavy rains, which would be advantageous to the heat transfer from the heating field to upper air.In the meantime,the subsidence air-current of the anticyclone located in the west part of the West Pacific has also become stronger.All these must have an effect on the westerly extension of the subtropical high in a greater degree.

本文着重讨论梅雨期间大一暴雨前期,西太平洋海洋加热场增强,对副高西伸活动影响的若干物理过程.对该地区上空垂直环流圈三维结构的计算、分析表明,在非平均情况下,该区上空存在准瓦克环流型,在160°E附近有一支上升气流,临近雨日前夕明显地增强,这有利于西太平洋热带海洋加热场的能量向高空输送。与此同时,西太平洋西部反气旋下沉气流亦明显加强。这些均对副高的西伸有一定的影响。

A parallel (m, n) selection algorithm is presented to solve the problem of se- lecting the m smallest (largest) elcmcrts form n given numbers (n> m).It is easily imple- mented on a shared-memory single instruction stream multiple data strearn(SIMD) com- putcr. It requires n / 2m processors and O(log(n/2m)logm·m) time in the worst and aver- age case, the cost of this algorithm is O(n/21og(n/2m)logm).

给出求解从任意给定的n个数据中选取m个最小(最大)者即(m,n)选择问题的一个并行算法(m平均情况下均为O(log(n/2m)logm·m),其并行执行代价为O(n/2log(n/2m)logm).

 
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