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An optimization method to solve a fully intuitionistic fuzzy non-linear separable programming problem 求解全直觉模糊非线性可分规划问题的优化方法
4区 管理学 Q3 OPERATIONS RESEARCH & MANAGEMENT SCIENCE Pub Date : 2023-09-21 DOI: 10.1051/ro/2023152
Kirti Sharma, VISHNU PRATAP SINGH, Bhavin Poojara, Ali Ebrahimnejad, Debjani Chakraborty
This paper presents an optimization method to solve a non-linear separable programming problem with coefficients and variables as generalized trapezoidal intuitionistic fuzzy numbers. Such optimization problems are known as fully intuitionistic fuzzy non-linear separable programming problems. The optimization method is based on the linear approximation of fully intuitionistic fuzzy non-linear separable functions. The concept of an intuitionistic fuzzy line segment between two intuitionistic fuzzy points is introduced to find the required linear approximation. In this way, a fully intuitionistic fuzzy non-linear programming problem is converted into an intuitionistic fuzzy linear programming problem. The defuzzification and component-wise comparison techniques are then used to convert the fully intuitionistic fuzzy linear programming problem to a linear programming problem with crisp coefficients which can then be solved by using traditional optimization techniques. The application of the proposed approach in an investment problem faced by a businessman has been presented.
本文提出了一种求解系数和变量为广义梯形直觉模糊数的非线性可分规划问题的优化方法。这种优化问题被称为完全直觉模糊非线性可分规划问题。该优化方法基于全直觉模糊非线性可分函数的线性逼近。在两个直觉模糊点之间引入直觉模糊线段的概念,求出所需的线性逼近。这样,就把一个完全直觉模糊非线性规划问题转化为一个直觉模糊线性规划问题。然后使用去模糊化和组件明智比较技术将完全直观的模糊线性规划问题转化为具有清晰系数的线性规划问题,然后可以使用传统的优化技术来解决。提出了在一个商人面临的投资问题中应用所提出的方法。
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引用次数: 0
Modular design of new products and remanufacturing of used products under mass customization 大规模定制下的新产品模块化设计与旧产品再制造
4区 管理学 Q3 OPERATIONS RESEARCH & MANAGEMENT SCIENCE Pub Date : 2023-09-21 DOI: 10.1051/ro/2023151
Honglin Yang, Lan Jiang
Modular architecture design can not only increase the product variety and thus make mass customization (MC) easier, but also improve interchangeability and then lower the remanufacturing cost. This paper models a remanufacturing MC supply chain with one manufacturer and one retailer. The manufacturer, as a Stackelberg game leader, designs and then sells the new and modular MC products via its brand retailer, and meanwhile the remanufacturing of used MC products would be carried out by either the manufacturer or the retailer. We study the optimal modular design for new MC products and the best remanufacturing mode for used MC products. One centralized and two decentralized decision models are formulated, and the equilibrium solutions of proposed models are compared and analyzed. Findings show that, compared to the retailer-remanufacturing mode, the manufacturer-remanufacturing mode can be superior in terms of the ability to cope with customer customization requirements (i.e., the modularity level), total supply chain profit, and consumer surplus. Moreover, both supply chain members and consumers would prefer the manufacturer-remanufacturing mode when the parameters meet certain conditions. We also extend the model to two scenarios: the remanufacturing is bounded by cores supply and the retailer acts a leader, so as to verify the robustness of main results. Numerical examples demonstrate the theoretical results.
模块化结构设计不仅可以增加产品的多样性,从而使大规模定制更加容易,而且可以提高互换性,从而降低再制造成本。本文建立了一个具有一个制造商和一个零售商的再制造MC供应链模型。制造商作为Stackelberg游戏的领导者,通过其品牌零售商设计并销售新的模块化MC产品,同时二手MC产品的再制造将由制造商或零售商进行。研究了MC新产品的最优模块化设计和MC旧产品的最佳再制造模式。建立了一个集中式决策模型和两个分散式决策模型,并对模型的均衡解进行了比较和分析。研究结果表明,与零售商-再制造模式相比,制造商-再制造模式在应对客户定制需求的能力(即模块化水平)、供应链总利润和消费者剩余方面都具有优势。而且,当参数满足一定条件时,供应链成员和消费者都倾向于制造商-再制造模式。我们还将模型扩展到再制造以核心供应为边界和零售商作为领导者两种场景,以验证主要结果的鲁棒性。数值算例验证了理论结果。
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引用次数: 0
On the degree of trees with Game Chromatic Number 4 论游戏色数为4的树的度
4区 管理学 Q3 OPERATIONS RESEARCH & MANAGEMENT SCIENCE Pub Date : 2023-09-19 DOI: 10.1051/ro/2023150
Ana Luísa C. Furtado, Miguel Alfredo Del Rio Palma, Simone Dantas, Celina M. H. de Figueiredo
The coloring game is played by Alice and Bob on a finite graph $G$. They take turns properly coloring the vertices with $t$ colors. The goal of Alice is to color the input graph with t colors, and Bob does his best to prevent it. If at any point there exists an uncolored vertex without available color, then Bob wins; otherwise Alice wins. The game chromatic number $chi_g(G)$ of $G$ is the smallest number $t$ such that Alice has a winning strategy. In 1991, Bodlaender showed the smallest tree $T$ with $chi_g(T)$ equal to $4$, and in 1993 Faigle et al. proved that every tree $T$ satisfies the upper bound $chi_g(T) leq 4$. The stars $T = K_{1,p}$ with $pgeq 1$ are the only trees satisfying $chi_{g}(T)=2$; and the paths $T= P_n$, $ngeq 4$, satisfy $chi_{g}(T)=3$. Despite the vast literature in this area, there does not exist a characterization of trees with $chi_g(T) = 3$ or $4$. We answer a question about the required degree to ensure $chi_g(T) = 4$, by exhibiting infinitely many trees with maximum degree 3 and game chromatic number 4.
填色游戏是由Alice和Bob在一个有限图$G$上玩的。他们轮流用$t$颜色给顶点上色。Alice的目标是用t种颜色给输入图上色,Bob会尽力阻止这种情况。如果在任何一点上存在一个没有可用颜色的未着色顶点,那么Bob获胜;否则Alice获胜。$G$的游戏色数$chi_g(G)$是最小的数$t$,使得Alice有一个获胜的策略。1991年,Bodlaender展示了$chi_g(T)$等于$4$的最小树$T$, 1993年Faigle等人证明了每棵树$T$满足上界$chi_g(T) leq 4$。星星$T = K_{1,p}$和$pgeq 1$是唯一令人满意的树$chi_{g}(T)=2$;路径$T= P_n$$ngeq 4$满足$chi_{g}(T)=3$。尽管在这方面有大量的文献,但没有一个用$chi_g(T) = 3$或$4$来描述树木的特征。我们通过展示无限多的树,最大度为3,游戏色数为4,回答了一个关于确保$chi_g(T) = 4$所需度的问题。
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引用次数: 0
On two variants of split graphs: 2-unipolar graph and k-probe-split graph 关于分裂图的两个变体:2-单极图和k-探针分裂图
4区 管理学 Q3 OPERATIONS RESEARCH & MANAGEMENT SCIENCE Pub Date : 2023-09-15 DOI: 10.1051/ro/2023149
Luciano N. Grippo, Verónica A. Moyano
A graph is called split if its vertex set can be partitioned into a stable set and a clique. In this article, we studied two variants of split graphs. A graph G is polar if its vertex set can be partitioned into two sets A and B such that G[A] is a complete multipartite graph and G[B] is a disjoint union of complete graphs. A 2-unipolar graph is a polar graph G such that G[A] is a clique and G[B] is the disjoint union of complete graphs with at most two vertices. We present a minimal forbidden induced subgraph characterization for 2-unipolar graphs. In addition, we show that they can be represented as an intersection of substars of special cacti. Let G be a graph class, the G-width of a graph G is the minimum positive integer k such that there exist k independent sets N1,...,Nk such that a set F of nonedges of G, whose endpoints belong to some Ni with i = 1,...,k, can be added so that the resulting graph G0 belongs to G. We say that a graph G is k-probe-G if it has G-width at most k and when G is the class of split graphs it is denominated k-probe-split. We prove that deciding, given a graph G and a positive integer k, whether G is a h-probe-split graph for some h ≤ k is NP-complete. Besides, a characterization by minimal forbidden induced subgraphs for 2-probesplit cographs is presented.
如果图的顶点集可以划分为稳定集和团,则称之为分裂图。在本文中,我们研究了分裂图的两个变体。如果图G的顶点集可以划分为两个集合A和B,使得G[A]是完全多部图,G[B]是完全图的不相交并,则图G是极的。一个2-单极图是一个极坐标图G,使得G[A]是一个团,G[B]是最多有两个顶点的完全图的不相交并。提出了2-单极图的最小禁止诱导子图刻划。此外,我们证明它们可以表示为特殊仙人掌的子星的交集。设G是一个图类,图G的G宽度是最小正整数k,使得存在k个独立集N1,…,Nk使得G的非边集合F,其端点属于某个Ni,且i = 1,…当图G的宽度不超过k时,我们称图G为k-probe-G,当G是分割图的一类时,我们称图G为k-probe-split。我们证明了给定一个图G和一个正整数k,判定G是否是一个h≤k的h探针分割图是np完全的。此外,给出了用最小禁止诱导子图刻画2-问题分割图的方法。
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引用次数: 0
Modelling the forest harvesting tour problem 森林采伐旅游问题的建模
4区 管理学 Q3 OPERATIONS RESEARCH & MANAGEMENT SCIENCE Pub Date : 2023-09-11 DOI: 10.1051/ro/2023142
Víctor Viana, Héctor Cancela, Lorena Pradenas
In a globalized market, forest management plans play an important role in the sustainability of forest enterprises. Several optimization processes have therefore been developed to support decision-making in forestry operations. However, important issues remain to be addressed, such as planning the allocation of harvesting areas and scheduling the harvesting teams that are contracted for these purposes. Harvesting schedules include different time scales and natural constraints, so that finding optimal or even good quality ones constitutes a highly complex combinatorial optimization problem. Efficient planning of harvesting operations can significantly reduce the costs associated with logistics and improve the economic performance of companies in the sector. In Uruguay, almost 75% of total forest harvesting operations for pulp production are carried out by contractor companies, so they are an important player in the supply chain. This study aims to optimize the allocation and routing of the harvesting equipment of forest contractors, which must be located at the sites to be harvested during the year. Numerical experiments over a case study based on realistic data have shown that realistic-sized instances can be resolved by standard mathematical programming software in a reasonable time. The mathematical programming model can also be useful to evaluate potential gains in joint planning by several contractors with respect to the costs incurred by separate planning; as illustrated also with numerical examples over the same case study. This model can be used to support annual forest harvest scheduling and equipment allocation for corporate contractors, leading to better quality plans and improvement opportunities.
在全球化市场中,森林经营计划对森林企业的可持续性起着重要作用。因此,制定了若干优化程序,以支持林业业务的决策。然而,一些重要的问题仍有待解决,例如规划采收区域的分配和为这些目的而签约的采收小组的日程安排。收获计划包括不同的时间尺度和自然约束,因此寻找最优的甚至是高质量的收获计划构成了一个高度复杂的组合优化问题。有效的采收作业计划可以显著降低与物流相关的成本,并提高该行业公司的经济绩效。在乌拉圭,近75%的纸浆生产森林采伐作业是由承包商公司进行的,因此它们是供应链中的重要参与者。本研究旨在优化森林承包商采伐设备的配置和路线,这些设备必须位于全年的采伐地点。基于实际数据的数值实验表明,标准数学规划软件可以在合理的时间内解决实际尺寸的实例。数学规划模型也可用于评价由几个承包商就单独规划所引起的费用进行联合规划的潜在收益;在相同的案例研究中也用数值例子说明了这一点。该模型可用于支持企业承包商的年度森林采伐计划和设备分配,从而提供更好的质量计划和改进机会。
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引用次数: 0
Bounds for Aα-eigenvalues a α-特征值的界
4区 管理学 Q3 OPERATIONS RESEARCH & MANAGEMENT SCIENCE Pub Date : 2023-09-11 DOI: 10.1051/ro/2023144
João Domingos Gomes da Silva Júnior, Carla Silva Oliveira, Liliana Manuela G. C. da Costa
Let G be a graph with adjacency matrix A(G) and degree diagonal matrix D(G). In 2017, Nikiforov [1] defined the matrix Aα(G), as a convex combination of A(G) and D(G), the following way, Aα(G) = αA(G) + (1 − α)D(G), where α ∈ [0,1]. In this paper we present some new upper and lower bounds for the largest, second largest and the smallest eigenvalue of Aα-matrix. Moreover, extremal graphs attaining some of these bounds are characterized.
设G为具有邻接矩阵a (G)和度对角矩阵D(G)的图。2017年,Nikiforov[1]将矩阵a α(G)定义为a (G)与D(G)的凸组合,即a α(G) = α a (G) +(1−α)D(G),其中α∈[0,1]。本文给出了a α-矩阵的最大、第二大和最小特征值的一些新的上界和下界。此外,对达到某些边界的极值图进行了刻画。
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引用次数: 1
Optimal strategies for green supply chains with competition between green and traditional suppliers 绿色供应商与传统供应商竞争下的绿色供应链优化策略
4区 管理学 Q3 OPERATIONS RESEARCH & MANAGEMENT SCIENCE Pub Date : 2023-09-11 DOI: 10.1051/ro/2023141
Jing Cong, Tao Pang, Hongjun Peng
We consider a green supply chain that consists of a traditional supplier, a green supplier, and a manufacturer. We investigate the optimal strategies for the suppliers' raw material prices, and the manufacturer's production and green raw material ordering. In particular, we consider three price competition models: the traditional supplier-led model, the green supplier-led model, and the Nash game model. The results indicate that the more dominant the green supplier, the more likely the green material price will be higher than the traditional material price. In addition, the manufacturers' product greenness level is the lowest under the green supplier-led model and the highest under the traditional supplier-led model. We also find that, as the manufacturer's yield uncertainty increases, the prices of traditional and green raw materials both decrease with respect to the manufacturer's product greenness level. Moreover, as customers' green preference increases, the price of green raw materials increases, the price of traditional raw materials decreases, and the product greenness level increases.
我们考虑一个由传统供应商、绿色供应商和制造商组成的绿色供应链。研究了供应商原材料价格、制造商生产和绿色原材料订购的最优策略。我们特别考虑了三种价格竞争模型:传统的供应商主导模型、绿色供应商主导模型和纳什博弈模型。结果表明,绿色供应商越占优势,绿色材料价格越有可能高于传统材料价格。此外,绿色供应商主导模式下制造商的产品绿色度水平最低,传统供应商主导模式下制造商的产品绿色度水平最高。我们还发现,随着制造商产量不确定性的增加,传统原材料和绿色原材料的价格相对于制造商的产品绿色水平都有所下降。而且,随着顾客绿色偏好的增加,绿色原材料价格上涨,传统原材料价格下降,产品绿色度水平提高。
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引用次数: 0
On Frèchet normal cone for nonsmooth mathematical programming problems with switching constraints                           具有切换约束的非光滑数学规划问题的fr<s:1>切法线锥
IF 1.8 4区 管理学 Q3 OPERATIONS RESEARCH & MANAGEMENT SCIENCE Pub Date : 2023-09-08 DOI: 10.1051/ro/2023138
Balendu Bhooshan Upadhyay, Zahra Jafariani, Nader Kanzi, Maryam Naderi Parizi
This paper is devoted to the study of a class of nonsmooth programming problems with switching constraints (abbreviated as, (NMPSC)), where all the involved functions in the switching constraints are assumed to be locally Lipschitz. We investigate the properties of Frèchet normal cone of (NMPSC). In particular, we introduce two Guignard type constraint qualifications for (NMPSC) in terms of Michel-Penot subdifferential. Moreover, we derive two estimates for the Fr‘echet normal cone of (NMPSC) and further establish stationarity conditions at an optimal solution for (NMPSC). To the best of our knowledge, this is for the first time Frèchet normal cone for (NMPSC) have been studied in the setting of Euclidean spaces.
本文研究了一类具有切换约束的非光滑规划问题(简称NMPSC),其中切换约束中所有涉及的函数都被假定为局部Lipschitz。研究了(NMPSC)的fr切法锥的性质。特别地,我们根据micheli - penot子微分引入了(NMPSC)的两个Guignard型约束条件。此外,我们得到了(NMPSC)的Fr ' cheet法锥的两个估计,并进一步建立了(NMPSC)最优解的平稳性条件。据我们所知,这是第一次在欧几里得空间中研究(NMPSC)的fr切法向锥。
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引用次数: 0
Optimal investment and consumption strategies for an investor with stochastic economic factor in a defaultable market 违约市场中具有随机经济因素的投资者的最优投资与消费策略
IF 1.8 4区 管理学 Q3 OPERATIONS RESEARCH & MANAGEMENT SCIENCE Pub Date : 2023-09-08 DOI: 10.1051/ro/2023139
Weiwei Shen, Juliang Yin
This paper considers the issue of optimal investment and consumption strategies for an investor with stochastic economic factor in a defaultable market. In our model, the price process is composed of a money market account and a default-free risky asset, assuming they rely on a stochastic economic factor described by a diffusion process. A defaultable perpetual bond is depicted by the reduced-form model, and both the default risk premium and the default intensity of it rely on the stochastic economic factor. Our goal is to maximize the infinite horizon expected discounted power utility of the consumption. Applying the dynamic programming principle, we derive the Hamilton--Jacobi--Bellman (HJB) equations and analyze them using the so-called sub-super solution method to prove the existence and uniqueness of their classical solutions. Next, we use a verification theorem to derive the explicit formula for optimal investment and consumption strategies. Finally, we provide a sensitivity analysis.
研究了一个具有随机经济因素的投资者在违约市场中的最优投资与消费策略问题。在我们的模型中,价格过程由货币市场账户和无违约风险资产组成,假设它们依赖于一个由扩散过程描述的随机经济因素。用简化模型描述了可违约永续债券,其违约风险溢价和违约强度都依赖于随机经济因素。我们的目标是使消费的无限预期折扣电力效用最大化。应用动态规划原理,导出了Hamilton—Jacobi—Bellman (HJB)方程,并利用所谓的次上解方法对其进行了分析,证明了其经典解的存在唯一性。其次,利用验证定理推导出最优投资与消费策略的显式公式。最后,我们进行了敏感性分析。
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引用次数: 0
Optimizing retailer's order and financing decisions on an e-commercial platform considering cash flow 考虑现金流的电子商务平台上零售商订单和融资决策优化
IF 1.8 4区 管理学 Q3 OPERATIONS RESEARCH & MANAGEMENT SCIENCE Pub Date : 2023-09-07 DOI: 10.1051/ro/2023137
Honglin Yang, Yue Yu
The mismatch in cash flow often distorts business operational decisions and even lead to bankruptcy for enterprises. This paper investigates the order and financing decisions of a capital-constrained retailer who borrows from an e-commerce platform to fund its business operations. The e-commercial platform, which has full capital, provides three financing schemes: (1) lump-sum repayment (scheme L), (2) average capital plus interest repayment (scheme P), and (3) average capital repayment (scheme A). We first model the financing behaviors of the retailer and determine the circumstances in which the retailer favors a specific financing scheme. Then, we propose a viable cash flow matching strategy in which the retailer retains a portion of its initial capital to address potential repayment shortfalls in each period. To the best of our knowledge, this paper is the first to integrate the capital-constrained retailer’s cash flow management into the platform financing scheme. The results show that: In the absence of cash flow considerations, the retailer prefers scheme L since selecting scheme P or A may lead to bankruptcy. In contrast, if the cash flow matching is efficiently realized, the retailer always prefers scheme P to enhance its performance. Numerical examples are used to validate the theoretical results.
现金流的不匹配往往会扭曲企业的经营决策,甚至导致企业破产。本文研究了一家资金受限的零售商从电子商务平台借款以资助其业务运营的订单和融资决策。电子商务平台拥有充足的资金,提供了三种融资方案:(1)一次性还款(方案L),(2)平均资本加利息偿还(方案P),(3)平均资本偿还(方案A)。我们首先对零售商的融资行为进行建模,并确定零售商倾向于特定融资方案的情况。然后,我们提出了一个可行的现金流匹配策略,其中零售商保留其初始资本的一部分,以解决每个时期潜在的还款不足。据我们所知,本文首次将资金受限的零售商的现金流管理整合到平台融资方案中。结果表明:在没有现金流量考虑的情况下,零售商更倾向于方案L,因为选择方案P或方案A可能导致破产。相反,如果现金流匹配有效地实现,零售商总是倾向于方案P来提高其绩效。数值算例验证了理论结果。
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引用次数: 0
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Rairo-Operations Research
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