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Science China(Information Sciences) 2021年第5期64卷 5-16页

作者： fred glover Zhipeng Lü Meta-Analytics Inc. School of Computer Science and Technology Huazhong University of Science and Technology

Focal distance tabu search modifies a standard tabu search algorithm for binary optimization by augmenting a periodic diversification step that drives the search away from a current best(or elite) solution until the objective function deteriorates beyond a specified threshold or until attaining a lower bound on the distance from the originating solution. The new augmented algorithm combines the threshold and lower bound approaches by introducing an initial focal distance for the lower bound which is updated when the diversification step is completed. However, rather than terminating the diversification step at the customary completion point, focal distance tabu search(TS) retains the focal distance bound through additional search phases designed to improve the objective function, drawing on a strategy proposed with strategic *** algorithm realizes this strategy by partitioning the variables into two sets which are managed together with an abbreviated tabu search process. An advanced version of the approach drives the search away from a collection of solutions rather than a single originating solution, introducing the concept of a signature solution to guide the search. The method can be employed to augment a variety of other metaheuristic algorithms such as those using threshold procedures, late acceptance hill climbing, iterated local search, breakout local search, GRASP, and path relinking.

关键词： tabu search diversification strategic oscillation adaptive partitioning metaheuristics

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CREATING BALANCED AND CONNECTED CLUSTERS TO IMPROVE SERVICE DELIVERY ROUTES IN LOGISTICS PLANNING

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Journal of Systems Science and Systems Engineering 2010年第4期19卷 453-480页

作者： Buyang CAO fred glover Esri Inc. 380 New York Street CA 92373 USA OptTek Systems Inc. 2241 17th Street Boulder CO 80302 USA

A challenging problem in real world logistics applications consists in planning service territories for customer deliveries, in contexts where customers must be clustered into groups that satisfy various conditions such as balance and connectivity. In this paper we propose new algorithms for producing such clusters based upon special procedures for exploiting Thiessen polygons. Our methods are able to handle multiple criteria for balancing the clusters, such as the number of customers in each cluster, the service revenue in each cluster, or the delivery/pickup quantity in each cluster. Computational results demonstrate the efficacy of our new procedures, which are able to assist users to plan service personal service territories and vehicle routes more efficiently.

关键词： Clustering K-means logistics routing Thiessen polygon

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A simple multi-wave algorithm for the uncapacitated facility location problem

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Frontiers of Engineering Management 2018年第4期5卷 451-465页

作者： fred glover Said HANAFI Oualid GUEMRI Igor CREVITS Leeds School of Business University of ColoradoBoulderCO 80309-0419USA LAMIH CNRS UMR 8201Université de ValenciennesFrance

The multi-wave algorithm(glover, 2016)integrates tabu search and strategic oscillation utilizing repeated waves(nested iterations) of constructive search or neighborhood search. We propose a simple multi-wave algorithm for solving the Uncapacitated Facility Location Problem(UFLP) to minimize the combined costs of selecting facilities to be opened and of assigning each customer to an opened facility in order to meet the customers' demands. The objective is to minimize the overall cost including the costs of opening facilities and the costs of allocations. Our experimental tests on a standard set of benchmarks for this widely-studied class of problems show that our algorithm outperforms all previous methods.

关键词： discrete optimization UFLP multi-wave optimization strategic oscillation tabu search

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Ultrastructure of compatible and incompatible interactions in phloem sieve elements during the stylet penetration by cotton aphids in melon

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Insect Science 2018年第4期25卷 631-642页

作者： Elisa Garzo Mercedes Fernandez-Pascual Cesar Morcillo Alberto Fereres M. Luisa G6mez-Guillamon W. fred Tjallingii Instituto de Ciencias Agrarias Consejo Superior de Investigaciones Cientificas (ICA-CSIC) Madrid Spain Laboratory of Entomology Wageningen University Wageningen the Netherlands Instituto de Hortofruficultura Subtropical y Mediterranea 'La Mayora' Universidad de Malaga-CSIC (IHSM-UMA-CSIC) Algarrobo-Costa Malaga Spain

Resistance of the melon line TGR-1551 to the aphid Aphis gossypii is based on preventing aphids from ingesting phloem sap. In electrical penetration graphs （EPGs）, this resistance has been characterized with A. gossypii showing unusually long phloem salivation periods （waveform El） mostly followed by pathway activities （waveform C） or if followed by phloem ingestion （waveform E2）, ingestion was not sustained for more than 10 min. Stylectomy with aphids on susceptible and resistant plants was performed during EPG recording while the stylet tips were phloem inserted. This was followed by dissection of the penetrated leaf section, plant tissue fixation, resin embedding, and ultrathin sectioning for transmission electron microscopic observation in order to study the resistance mechanism in the TGR. The most obvious aspect appeared to be the coagulation of phloem proteins inside the stylet canals and the punctured sieve elements. Stylets of 5 aphids per genotype were amputated during sieve element （SE） salivation （El） and SE ingestion （E2）. Cross-sections of stylet bundles in susceptible melon plants showed that the contents of the stylet canals were totally clear and also, no coagulated phloem proteins occurred in their punctured sieve elements. In contrast, electron-dense coagulations were found in both locations in the resistant plants. Due to calcium binding, aphid saliva has been hypothesized to play an essential role in preventing/suppressing such coagulations that cause occlusion of sieves plate and in the food canal of the aphid＇s stylets. Doubts about this role of E 1 salivation are discussed on the basis of our results.

关键词： Aphis gossypii glover Cucumis melo L. feeding behavior insect-plant resistance phloem defense response watery saliva

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