共查询到20条相似文献,搜索用时 265 毫秒
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对一般网络上的占线中心选址问题及其竞争算法进行了研究.文献[6]证明了该问题的竞争比下界是(n-2△e+√(n-22△e2+4(n-1)/2(n-1)) ,其中△e是所给空间最大的相对距离,并证明了该问题不存在常数竞争比的竞争算法.本文给出了一个多项式时间的竞争算法,并证明该算法的竞争比为△e△w,其中△w是所给空间点间的最大相对权重.所得结论不仅对于理论上占线中心选址问题的竞争算法的设计与分析,还是对于实际中的选址决策,都具有一定的指导意义. 相似文献
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XU Liqiong GUO Xiaofeng 《系统科学与复杂性》2005,18(4):564-569
A. Kaneko and K. Ota proved that for a minimally (n, λ)-connected graph G, if |G| = p ≥ 3n - 1, then e(G) ≤ nλ(|G| - n); and if e(G) = nλ(|G| - n), then G is isomorphic to the graph Kn^λ,p-n which is obtained from the complete bipartite graph Kn,p-n by replacing each edge with A multiple edges; if 3n - 1 ≥ |G}≥ n + 1, then e(G) ≤λ(|G| + n)^2/8. In this paper, we determine all the minimally (n, λ)-connected graphs with order p and the maximum size λ(p+n)^2/8 for 3n- 1 ≥ p ≥ n+ 1 for 3n-1≥p≥n+1. 相似文献
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Shuhua Wang Yong Wei 《系统科学与信息学报》2008,6(2):181-188
To the transformation F(a(s))=a(s)/d^s,this paper brings out two kinds of ways to ascertain parameter d, one way, we let d be arithmetic average of class ration inverse, namely d1=1/n-1(y^(0)(2)/y^(0)(1)+y^(0)(3)/y^(0)(2)+y^(0)(4)/y^(0)(3)+…+y^(0)(n-1)/y^(0)(n-1)+y^(0)(n)/y^(0)(n-1).The other way, we let d be geometric average of class ration inverse, namely d2=(y^(0)(n)/y^(0)(1))^1/n-1.Through the close theory testifying, we find that the model given by this paper has white exponential law coincidence property, that is to say, if we build the model to the normal index, the result has not model error. At the same time, this paper points out, the request d 〉 1 is not appropriate to monotone decreasing series; even precision of model will decrease. 相似文献
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This paper is devoted to the study of semi-bent functions with several parameters flexible on the finite field F2n.Boolean functions defined on F2n of the form f(r)ab(x) =Trn1(axr(2m-1))+Tr41(bx(2n-1)/5) and the form g(rs)abcd(x)=Trn1(axr(2m-1))+Tr41(bx(2n-1)/5)+Trn1(cx(2m-1)1/2+1)+Trn1(dx(2m-1)s+1) where n = 2m,m = 2(mod 4),a,c ∈ F2n,and b ∈ F(16),d ∈ F2,are investigated in constructing new classes of semi-bent functions.Some characteristic sums such as Kloosterman sums and Weil sums are employed to determine whether the above functions are semi-bent or not. 相似文献
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研究的是订单需求信息不确定条件下的按订单生产(make-to-order,MTO)模式企业的生产决策问题.这类企业单批产品的固定启动生产成本较高,企业允许延期交货,但需要承受延期惩罚费用.因此本文研究在需求订单到达序列信息不确定的条件下,决策怎么安排生产使得总固定启动生产费用和延期费用最优的生产决策问题.考虑了占线生产模型,首先证明该问题的竞争比下界是3.随后受证明的启发,研究仅针对两类产品的问题,给出了一个新的占线生产策略并证明竞争比为3,因此说明所做的下界分析是紧的,同时证明了所给出针对两类产品的问题的占线策略是最优的. 相似文献
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局内军车调度的时间优化及其竞争策略 总被引:7,自引:1,他引:6
提出时间目标函数下的局内k-军车调度问题,应用复位策略给出该问题的几种竞争算法:给出了对应的局内k-服务器问题的竞争比的c时的该问题的竞争比为c 1 1/θ的竞争算法;分别给出了当k=n和k=n-1时该问题的竞争比为1和1+1/θ的竞争算法。 相似文献
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占线顶点覆盖问题的结构性下界 总被引:1,自引:1,他引:0
代文强 《系统工程理论与实践》2012,32(1):134-138
在实际 顶点覆盖选址过程中,经常会遇到如下的情形:在需要服务的边的个数未知的前提下,决策者需要决定在哪里建立初始的设施(或设施集),同时还要求,当新的设施建立后,前面已经建立的设施不能被删除.以往一般建立的模型和算法都是针对静态选址而言的,这里需要的是满足上述约束的动态选址模型.考虑了占线顶点覆盖问题,给出了一个不需要任何复杂性假设条件下的结构性的下界结果,并通过对一个限制性条件下的占线顶点覆盖问题给出算法并证明竞争性能比结果说明了所作的下界分析是紧的,同时证明了所给出的算法在非多项式时间内是最优的. 相似文献
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《系统工程理论与实践》2014,(5)
正August 10-14,2015Beijing,ChinaThe International Congress on Industrial and Applied Mathematics(ICIAM)is the premier international congress in the field of applied mathematics held every four years under the auspices of the International Council for Industrial and Applied Mathematics.From August 10 to 14,2015,mathematicians,scientists 相似文献
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《系统科学与系统工程学报(英文版)》2014,(2)
正AF:Any Field The School of Economics and Management at Tsinghua University(Tsinghua SEM)invites applications for faculty positions at all levels(Assistant Professor,Associate Professor and Full Professor)in any fields of business administration and management.Tsinghua SEM is the only school 相似文献
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Lü Min 《系统工程与电子技术(英文版)》2008,19(3)
To study the uncertain optimization problems on implementation schedule, time-cost trade-off and quality in enterprise resource planning (ERP) implementation, combined with program evaluation and review technique (PERT), some optimization models are proposed, which include the implementation schedule model, the timecost trade-off model, the quality model, and the implementation time-cost-quality synthetic optimization model. A PERT-embedded genetic algorithm (GA) based on stochastic simulation technique is introduced to the optimization models solution. Finally, an example is presented to show that the models and algorithm are reasonable and effective, which can offer a reliable quantitative decision method for ERP implementation. 相似文献
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