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  is optimal
     We assume that the processing time of each job and its penalty forms the regular proportion denoted by α∈[0,+∞).Preemption is not allowed.For this version,we present an on-line algorithm NPRL and prove the competitive ratio.Finally,a lower bound of this problem is proposed which shows that in the interval of α∈0,22∪[1,+∞) our algorithm is optimal.
     假设每个工件的罚值和加工长度成固定的比例α∈[0,+∞),即pj=αtj,针对工件加工不可中断情形,设计出算法NPRL,证明其参数竞争比,同时又给出问题下界,它们均为α的分段函数.算法NPRL在α∈0,2 2∪[1,+∞)已达到最优.
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     The multi-stage decision problem is to get a strategy, making the total profit of each stage is optimal.
     每个阶段的决策确定以后,就得到一个决策序列。 多阶段决策问题就是求一个策略,使各阶段效益的总和达到最优
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     The running time and the cost of the algorithms become O(n 2 /p) and O(n 2 ) respectively when p log pn , and the cost is optimal in this special case.
     当 plogp n时 ,时间复杂度为 O(n2 / p ) ,此时算法的运算成本达到最优 ;
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     It is difficult that investment level is optimal because of principal-agency.
     由于委托代理关系的存在,企业投资行为通常很难达到最优状态.
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     When using Huffman tree as the key tree,this paper proves that the average cost of re-keying and the average time cost of exponentation computation of each member is optimal in P-TGDH protocol.
     证明当密钥树为Huffman时,改进后的P-TGDH协议中,平均成员密钥更新量和平均指数运算时间开销均可达到最优
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  achieve the best
     So, deep-through analysis of the phase-comparison method and adoption of new evaluation methods is to be done to increase the bearing accuracy and achieve the best price performance, satisfying the equipment requirement of Navy.
     因此对它进行深入的研究和采用新的估算方法来提高其测向精度,使性价比达到最优,以满足海军装备的需求。
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     Firstly, the article design the framework of RADIUS Authentication, Authorization Accounting server based on the RADIUS protocol, adopt the structure that Separate the accept and management of packet to achieve the best performance both each part and whole server.
     首先,在RADIUS协议下,设计RADIUS认证/授服务器结构,采用用接收与处理分离的方法,使得各部分模块的性能达到最优,从而使服务器能符合高性能要求;
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     Then the paper draws out the relation curve graph,and works out the close curve equation,thereby to find out the effects' value when the drill's dynamic mechanical parameters achieve the best condition,and provide theoretic basis for designing digging machine.
     通过数据分析得出各影响因素与钻头动态力学参数间的数学关系 ,绘出关系曲线 ,作出曲线拟合方程 ,从而找出钻头动态力学参数达到最优时各影响因素值 ,为挖坑机设计提供理论依据 .
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     The stochastic Hopfield network is the network,where noise is added to the state variables in order to reach the global optimum and achieve the best detection.
     随机Hopfield神经网络通过对状态变量引入噪声 ,从而避免局部收敛 ,进而达到最优检测 .
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     This paper describes the quicksort algorithm and it's shortcomings by Hoare,and on the base of the algorithm,the balanceQuickSort algorithm is improved to make it achieve the best in the worst case using the linear finding middle term algorithm.
     阐述了Hoare的快速排序算法及其缺点,在此快速排序算法的基础上利用找中项的线性选择算法改进了快速排序算法,使得快速排序在最坏情况下的性能达到最优
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  “达到最优”译为未确定词的双语例句
     the C/C preform' s densities were important to C/C-SiC composites property. The density,flexural strength,shear strength and fracture toughness of the composites derived from the preform with the density of 1.2 g/cm3,were 1.786 g/cm3,204.1 MPa,16.1 MPa and 6.83 MPa· m1/2,respectively.
     不同的预制体密度对制得的复合材料性能有很大的影响,其中初始密度为1.2g/cm3试样制得的复合材料性能达到最优,其密度达到1.786g/cm3,弯曲强度达204.1MPa,剪切强度为16.1MPa,断裂韧性为6.83MPa·m1/2。
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     The results show that the hydrolysis degree can reach the maximum when the concentration of chlorhydric acid,amylase and cellulase is 5 mol/L,2 g/L and 1 g/L,respectively,at which the mass fraction of the total anthraquinones is 2.46%,(2.33%) and 2.23%, respectively.
     结果表明:当盐酸浓度为5 mol/L,淀粉酶质量浓度为2 g/L,纤维素酶质量浓度为1 g/L时,大黄结合蒽醌的糖苷键达到最优水解,此时总蒽醌质量分数分别为2.46%、2.33%和2.23%。
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     When the ratio of Si-Sr is 0.12%, the RG is 1.13 and the Qi is 1.10. These show that the quality of the boron cast iron is optimum.
     当Si Sr含量为0 12%时,含硼灰铸铁的成熟度RG=1 13,品质系数Qi=1 10,各项冶金质量指标达到最优
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     The result showed that when the hydrolytic temperature was 40℃, the amount of the lactase was 0.8g/kg, function time was 3 hours , pH value was 6.6 and amount of Mg2+ was 0.5 mL, the optimization of the hydrolytic technique can be reached.
     结果表明,温度在40℃,水解时间3h,加酶量0.8g/kg,pH 6.6及Mg~(2+)添加量(0.01%)0.5mL的条件下水解工艺达到最优
短句来源
     On a hypercube of size M×M×m,the time complexity is O(L~2ι)=O[(N~2n)/(M~2m)],where L=N/M,andι=n/m. Thus,the algorithm for large problems produces linear speed-up and optimal efficiency.
     在具有 M×M×m 个 PE 的超立方体上,设 L=N/M,l=n/m,则所需时间为 O(L~2l)=O[(N~2n)/(M~2m)],这样,算法使计算速度随处理机个数而线性增长,使计算效率达到最优.
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  is optimal
A labeling L is optimal if the labeling L produces the largest d(G, L).
      
It is concluded that acid treatment is optimal for producing good quality straw fiberboard.
      
A Lagrange relaxation algorithm generates an approximate solution, verifies whether the solution is optimal, and estimates the solution accuracy.
      
This algorithm under the monotonicity condition is optimal in the class of evolutionary algorithms.
      
Classic problems of control law construction for a linear dynamic object that is optimal by the quadratic criterion in the determinate and stochastic cases are reduced, as is known, to solving nonlinear matrix Riccati equations.
      
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  achieve the best
Space-time trellis codes can achieve the best tradeoff among bandwidth efficiency, diversity gain, constellation size and trellis complexity.
      
Based upon a poisson mobility model, an simple expression for CDT optimization is given out for the scheme to achieve the best cost performance of resource reservation.
      
This method adjusts the fuzzy controller to achieve the best isolation effect by analyzing the main frequency's characters and inspecting the change of system parameters.
      
The number of neurons and the type of transfer functions in the hidden layer of the neural network are changed from time to time to achieve the best forecast results.
      
Ways to optimize the relative retentivity to achieve the best possible resolution of multi-component mixtures is illustrated.
      
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In this paper, we study the automatic design of build-out network (BON) of coaxial cable system. The method based upon semi-infinite slopes is intended to approximate the prescribed transfer function. In order to minimize the error function, the least square method is adopted. The method of correction with term by term is used to avoid the divergent difficulties in iterative design. Finally, the distribution of poles and zeros is then found, and according to the synthesis theory of RC netwrok, the practical...

In this paper, we study the automatic design of build-out network (BON) of coaxial cable system. The method based upon semi-infinite slopes is intended to approximate the prescribed transfer function. In order to minimize the error function, the least square method is adopted. The method of correction with term by term is used to avoid the divergent difficulties in iterative design. Finally, the distribution of poles and zeros is then found, and according to the synthesis theory of RC netwrok, the practical BON is realized.

本文以同轴电缆的仿真线路的自动设计作为典型、来研究电子计算机辅助网络设计的全过程。本文提出以折线法来构造网络的逼近函数,并利用最小二乘法和逐项修正法相结合的办法来达到最优逼近,然后依据网络综合的理论,用RC网络的综合步骤来计算出实际元件值。本文用BASIC-Ⅱ语言编制了计算程序,对带宽为20兆赫的仿真线路作了实际计算,通过样盘制作,说明了实测结果和理论计算是相符的。

This paper presents some multi-criterion concurrently-optimal (2, 1, 31) and (3, 1, 31) nonsystematic convolutional codes for sequential decoding. These codes are constructed with a computer using an algorithm of constructing nonsystematic convolutional codes found by Zhang Zhao-zhi. Some of convolutional code generators are given. The minimum distance dc(m) and column distance profile dc(0, h) of these codes are found to be optimal. The free distance d, of the (2, 1) code is made up to 29-30, and of the (3,...

This paper presents some multi-criterion concurrently-optimal (2, 1, 31) and (3, 1, 31) nonsystematic convolutional codes for sequential decoding. These codes are constructed with a computer using an algorithm of constructing nonsystematic convolutional codes found by Zhang Zhao-zhi. Some of convolutional code generators are given. The minimum distance dc(m) and column distance profile dc(0, h) of these codes are found to be optimal. The free distance d, of the (2, 1) code is made up to 29-30, and of the (3, 1) code up to 47-49. All of the multi-criterion concurrently-optimal nonsystematic convolutional codespresented in this paper are intransparent with the greatest column inverse-distance dc(m) so that we. will be able to reduce the computational, requirements for recognizing the 180° phase-ambiguity in sequential decoding. The (3, 1, 31) nonsystematic code presented in this paper has concurrently-optimal performance for both 1/2 and 1/3 coding rates.

本文根据章照止所提供的造码方法,用计算机构造了若干适用于序列译码的多准则兼优(2,1,31)和(3,1,31)非系统卷积码,并列出了部分码的生成元。其最小距离d_c(m)、列距离分布d_c(0,h)均达到最优。(2,1)码的自由距离d_f可高达29~30,(3,1)码的d_f达47~49。本文所列出的多准则兼优码全部是非透晰的。它还具有最大反列距离d_c(m)。因此在序列译码中使用后,将降低识别180°相位模糊度所需的计算量。本文列出的(3,1,31)非系统码具有1/2、1/3两种编码速率兼优的特性。

This paper attempts to develop a mathematical model of optimal su-stainable yield of a reaewable population..of. two sexes. Harvesting policies involving the removal of before or after reproduction are considered . It is shown that the harvesting policg which maximizes the yield is one in which each class of the population is either completely harvested or not harvested at all, with at most one exceptional class of the female. At the end, an example is given to illustrate this model.

本文把Beddington和Taylor的方法推广到生物种群雌雄繁殖的矩阵模型上,证明有一个既使生物种群保持可以复原的水平,又使收获量达到最优的收获决策存在。这就是:对雄性个体在一定年龄级以前全部保留,此年龄级以后全部收获;对雌性个体则除一个年龄级为部份收获外,其余也应在某年龄级以前全部保留,此年龄级以后全部收获。本文还分别就繁殖前和繁殖后两种不同阶段的收获情况,提出确定收获年龄和实际计算最优方案的方法,最后举例说明计算步骤。

 
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