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Littérature scientifique sur le sujet « Facility location theory »

Auteur : Grafiati

Publié le 11 janvier 2025

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Articles de revues sur le sujet "Facility location theory"

Erkut, Erhan. « Facility location analysis : Theory and applications ». European Journal of Operational Research 45, n^o 1 (mars 1990) : 116–17. http://dx.doi.org/10.1016/0377-2217(90)90165-8.

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Deshmukh, Abhijit V. « Facility location and the theory of production ». Journal of Manufacturing Systems 11, n^o 3 (janvier 1992) : 224–25. http://dx.doi.org/10.1016/0278-6125(92)90007-3.

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Furuta, Takehiro, Mihiro Sasaki, Fumio Ishizaki, Atsuo Suzuki et Hajime Miyazawa. « A NEW CLUSTERING MODEL OF WIRELESS SENSOR NETWORKS USING FACILITY LOCATION THEORY ». Journal of the Operations Research Society of Japan 52, n^o 4 (2009) : 366–76. http://dx.doi.org/10.15807/jorsj.52.366.

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TEITZ, MICHAEL B. « TOWARD A THEORY OF URBAN PUBLIC FACILITY LOCATION ». Papers in Regional Science 21, n^o 1 (14 janvier 2005) : 35–51. http://dx.doi.org/10.1111/j.1435-5597.1968.tb01439.x.

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Hudak, Paul F. « Application of facility location theory to groundwater remediation ». Applied Geography 14, n^o 3 (juillet 1994) : 232–44. http://dx.doi.org/10.1016/0143-6228(94)90040-x.

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Lea, Anthony C. « Welfare Theory, Public Goods, and Public Facility Location ». Geographical Analysis 11, n^o 3 (3 septembre 2010) : 217–39. http://dx.doi.org/10.1111/j.1538-4632.1979.tb00691.x.

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Friesz, Terry L., Roger L. Tobin et Tan Miller. « Existence theory for spatially competitive network facility location models ». Annals of Operations Research 18, n^o 1 (décembre 1989) : 267–76. http://dx.doi.org/10.1007/bf02097808.

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Şen, Halil, et Mehmet Fatih Demiral. « Hospital Location Selection with Grey System Theory ». European Journal of Economics and Business Studies 5, n^o 1 (30 août 2016) : 66. http://dx.doi.org/10.26417/ejes.v5i1.p66-79.

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The facility location selection is one of the most important decisions for investors and entrepreneurs. It is a strategic issue besides often decides the fate of such a facility. In this kind of strategic decisions, decision makers should take into account various objectives and criteria and the process of location selection is inherently complicated. This paper considers the hospital location selection for a new public hospital by using Gray Relational Analysis (GRA) and Analytic Hierarchy Process (AHP). Gray Relational Analysis have been developed based on Grey System Theory. Grey System Theory is an interdisciplinary approach which first quantified by Deng in the early 1980’s as an alternative method in creating the uncertainty have been proposed. The basic idea of emergence is to estimate the behavior of the systems which cannot be overcome by the stochastic or fuzzy methods with limited number of data. In this paper, the weights of criteria have been determined by using Analytic Hierarchic Process, then the grey relational degrees have been calculated for each alternative location.

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Li, Wei-Lin, Peng Zhang et Da-Ming Zhu. « On Constrained Facility Location Problems ». Journal of Computer Science and Technology 23, n^o 5 (septembre 2008) : 740–48. http://dx.doi.org/10.1007/s11390-008-9172-5.

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Daham, Hajem Ati. « Neutrosophic Discrete Facility Location Problems ». International Journal of Neutrosophic Science 19, n^o 1 (2022) : 29–47. http://dx.doi.org/10.54216/ijns.190102.

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Discrete facility location problems are classified as types of facility location problems, wherein decisions on choosing facilities in specific locations are made to serve the demand points of customers, thus minimizing the total cost. The covering- and median-based problems are the common classified types of discrete facility location problems, which both comprise different classes of discrete problems as reviewed in this research. However, the discrete facility location problems shown in deterministic and known information and data under uncertain, vague, and ambiguous environments have usually been solved using intuitionistic fuzzy approaches. Neutrosophic is recently applied to tackle the uncertainty and ambiguity of information and data. This paper considered solving the discrete facility location problems under the neutrosophic environment, wherein the information of the locations, distances, times, and costs is uncertain. The mathematical models for the main types of neutrosophic discrete facility location problems, which remain unclear till now despite previous related works, are formulated in this study. Numerical examples demonstrated testing of the neutrosophic discrete models and comparison with the optimization solutions obtained from the normal situations.

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Thèses sur le sujet "Facility location theory"

Chardaire, P. « Facility location optimization and cooperative games ». Thesis, University of East Anglia, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267523.

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On April 27, 1802, I gave a shout of joy ... It was seven years ago I proposed to myself a problem which I have not been able to solve directly, but for which I had found by chance a solution, and I knew that it was correct, without being able to prove it. The matter often returned to my mind and I had sought twenty times unsuccessfully for this solution. For some days I had carried the idea about with me continually. At last, I do not know how, I found it, together with a large number of curious and new considerations concerning the theory of probability. Andre Marie Ampere. Facility location problems (or plant location problems) are general models that can be used when a set of clients has to be served by facilities. More precisely, we are given a set of potential facility locations and a set of clients. The optimization problem is to select a subset of the locations at which to place facilities and then to assign clients to theses facilities so as to minimize total cost. Most formulations considered in this thesis can be viewed as general models that can be applied to a wide range of context and practical situations. However, as this research has been partly initiated by the interest of the author in telecommunication network design we will introduce these models by considering problems in this particular area. In the context of telecommunication network design an application of discrete location theory is the optimization of access networks with concentrators. Typically, we have a number of terminal points that must be connected to a service point. An obvious solution is to use a dedicated link for each terminal (star network). However, it is clear that this solution can be very expensive when the number of terminals is large and when they are far from the service point. Access networks are often constructed by inserting concentrators between the terminals and the service point. Many terminals are connected to a facility which in turn is connected by a single link to the service point. The objective is to build a network that will provide the service at minimum cost. If no extra constraints are involved the mmimum cost network problem can be expressed as an uncapacitated facility location problem (UFL). If the number of terminals that can be connected to a concentrator is limited we obtain a so-called capacitated facility location problem (CFL). CFL can be extended to consider various types of concentrators with various capacities. This problem is the multi-capacitated facility location problem (MCFL). MCFL is a straightforward model for low speed packet switched data networks typical among which are networks connecting sellingpoint terminals to a database. For other networks, the problem may involve various traffic constraints. In chapter 1 we present those problems and compare solutions obtained by Lagrangian relaxation and simulated annealing algorithms. The architecture mentioned above can be extended with more than one hierarchical level of concentrator. Unfortunately, we pay for this cost saving through a decrease of reliability. Therefore, the number of levels is often limited to one or two. In chapter 2 we study an extension of UFL and CFL to two levels of concentrators. Obviously, the structure of a network changes according to the way requirements vary with time. In order to plan investments and to develop strategies, the evolution of a network has to be determined for several years ahead (typically four or five years). In this case the main questions to answer are: Where and when to establish concentrators and of what size? In chapter 3 we study this problem for the dynamic version of UFL. Now, with the network optimization problem, there naturally arises the problem of allocating the total minimum cost among customers fairly. Namely, we would like to allocate the cost in such a way that no subgroup of users would have incentive to withdraw and build their own network. The standard way to approach such a problem is by the means of cooperative game theory. In chapter 4 we study the core of location games derived from UFL and CFL, and in chapter 5 we propose methods to compute the nucleolus of these games.

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Zarabi, Patrick, et August Denes. « Solving the Facility Location Problem using Graph Theory and Shortest Path Algorithms ». Thesis, KTH, Optimeringslära och systemteori, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-229979.

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This thesis in systems engineering and optimization theory aims to solve a facility location problem within the context of a confined space with path and proximity constraints. The thesis was commissioned by LKAB Kiruna, to help in their decision of where to construct a new facility on their industrial premises. The facility location problem was divided into a main problem of finding the best position of the facility, and a sub-problem of how to model distances and feasible areas within this particular context. The distance and feasibility modeling was solved by utilizing graph theory to construct a graph representation of a geographic area and then obtain the necessary distances using Dijkstra’s shortest path algorithm. The main problem was then solved using a mixed integer linear programming formulation which utilizes the distances obtained through the Dijkstra algorithm. The model is also extended to not only decide the placement of one facility but to accommodate the placement of two facilities. The extended model was solved in three ways, a heuristic algorithm, a mixed integer non linear formulation and a mixed integer linear formulation. The results concluded that the implementation of the single facility model was able to obtain optimal solutions consistently. Regarding the extension, the mixed integer linear formulation was deemed to be the best model as it was computationally fast and consistently produced optimal solutions. Finally, several model improvements are identified to increase the applicability to different cases. These improvements could also allow the model to provide more strategical and managerial insights to the facility location decision process. Some future research into metaheuristics and machine learning are also suggested to further improve the usability of the models.
Detta examensarbete inom systemteknik och optimeringslära syftar till att lösa ett lagerplaceringsproblem. Lagret ska ställas inom en liten yta med hänsyn till ruttbegränsningar och närhet till andra byggnader. Denna uppsats är begärd av LKAB Kiruna for att underlätta i deras beslut om var ett nytt lager skulle kunna byggas inom deras industriområde. Lagerplaceringsproblemet delades upp i två problem, huvudproblemet var att lokalisera den basta platsen för lagret att byggas. Subproblemet var hur distanser och tillåtna placeringar ska modelleras i denna specifika kontext med rutt- och narhetsbegränsningar. Distans- och platsmodelleringen gjordes genom att skapa en grafrepresentation av industriområdet. Sedan användes Dijkstras kortaste vägen algoritm för att erhålla alla distanser mellan möjliga byggområden och de produktionsanläggningar som behöver tillgång till lagret. Huvudproblemet kunde sedan lösas med hjälp av dessa distanser och en linjär heltalsoptimeringsmodell. Modellen utökades sedan för att tillåta placeringen av två separata lagerbyggnader. Den utökade modellen löstes med hjälp av tre olika implementeringar, en heuristisk algoritm, en ickelinjär heltalsoptimeringsmodell samt en linjär heltalsoptimeringsmodell. Resultaten visade att implementeringen av det ursprungliga lagerplaceringsproblemet konsekvent kunde beräkna optimala lösningar. Den utökade modellen löstes bäst av den linjära heltalsoptimeringsimplementeringen, då denna implementering konsekvent resulterade i bäst (lägst) värde i målfunktion samt löste problemet med låg beräkningstid. Slutligen identifierades flertalet potentiella modellförbättringar som skulle kunna implementeras för att ge modellen mer generaliserbarhet. Detta skulle även innebära att modellen själv kan utvärdera hur många lager som bör byggas givet en satt budget. Således kan modellen även erbjuda mer strategiska beslut om dessa förbättringar implementeras. Ytterligare forskning skulle även kunna göras inom metaheuristik och maskininlärning för att ytterligare förbättra distansmodelleringen.

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Acar, Alper. « Optimal Urban Planning and Housing Prices : a Spatial Analysis ». Electronic Thesis or Diss., Bourgogne Franche-Comté, 2024. http://www.theses.fr/2024UBFCG008.

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La thèse étudie l'impact de l'aménagement urbain optimal surla diffusion des prix des logements dans un marché immobilier local. À travers une analyse du champ de la localisation optimale et de l'économétrie spatiale, cette étude vise à considérer comment les propriétés des graphes et les modèles de localisation optimale peuvent contribuer à mieux comprendre et à évaluer les impacts des effets de multiplicateur spatial dans l'économie. Pour ce faire, la recherche s'appuie sur une méthodologie combinant la création d'outils d'aide à la décision et l'étude des prix immobiliers par un modèle économétrique spatiale hiérarchique. Les résultats démontrent que la prise en compte des relations spatiales optimales permet une étude plus précise des impacts de l'aménagement urbain sur la diffusion des prix. A contrario, la considération de relations spatiales “classiques" sur ou sous-estime les impacts
This dissertation studies the effect of optimal urban planning on housing prices diffusion in local real-estate markets. The study uses facility location theory and spatial econometrics to investigate how graph properties and optimal location models can contribute to a better understanding and evaluation of the impact of spatial multiplier effects in the economy. To this end, the research is based on a methodology that combines the creation of decision-support tools and the study of real estate prices using hierarchical spatial econometric models. The results states that using optimal spatial relationships enables a more precise analysis of the impacts of urban planning on the diffusion of prices. Conversely, the consideration of “classical” spatial relationships either underestimates or overestimates the spatial impacts

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Rossin, Samuel. « Steiner Tree Games ». Oberlin College Honors Theses / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=oberlin1464700445.

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Torres, Soto Joaquin. « Dynamic and Robust Capacitated Facility Location in Time Varying Demand Environments ». 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-620.

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This dissertation studies models for locating facilities in time varying demand environments. We describe the characteristics of the time varying demand that motivate the analysis of our location models in terms of total demand and the change in value and location of the demand of each customer. The first part of the dissertation is devoted to the dynamic location model, which determines the optimal time and location for establishing capacitated facilities when demand and cost parameters are time varying. This model minimizes the total cost over a discrete and finite time horizon for establishing, operating, and closing facilities, including the transportation costs for shipping demand from facilities to customers. The model is solved using Lagrangian relaxation and Benders? decomposition. Computational results from different time varying total demand structures demonstrate, empirically, the performance of these solution methods. The second part of the dissertation studies two location models where relocation of facilities is not allowed and the objective is to determine the optimal location of capacitated facilities that will have a good performance when demand and cost parameters are time varying. The first model minimizes the total cost for opening and operating facilities and the associated transportation costs when demand and cost parameters are time varying. The model is solved using Benders? decomposition. We show that in the presence of high relocation costs of facilities (opening and closing costs), this model can be solved as a special case by the dynamic location model. The second model minimizes the maximum regret or opportunity loss between a robust configuration of facilities and the optimal configuration for each time period. We implement local search and simulated annealing metaheuristics to efficiently obtain near optimal solutions for this model.

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Verma, Anurag. « Network Based Approaches for Clustering and Location Decisions ». Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11849.

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The objective of this dissertation is to study commonly occurring location and clustering problems on graphs. The dissertation is presented as a collection of results in topics including finding maximum cliques in large graphs, graph clustering in large scale graphs, determining location of facilities for pre-positioning emergency relief supplies, and selecting nodes to form a virtual backbone in a wireless sensor network. To begin with, a new clique relaxation called a k-community is defined as a connected subgraph such that endpoints of every edge have at least k common neighbors within the subgraph. It is used to develop scale reduction techniques to obtain the maximum clique on very large scale real life networks. Analytically, the technique is been shown to be very effective on power-law random graphs. Experimental results on real life graph instances (Collaboration networks, P2P networks, Social networks, etc.) show our procedure to be much more effective than a regular k-core peeling approach. Next, a general purpose network clustering algorithm based on the clique relaxation concept of k-community is presented. A salient feature of this approach is that it does not use any prior information about the structure of the network. By defining a cluster as a k-community, the proposed algorithm aims to provide a clustering of a network into k-communities with varying values of k. Even though the algorithm is not designed to optimize any particular performance measure, the computational results suggest that it performs well on a number of criteria that are used in literature to evaluate the quality of a clustering. The third topic deals with choosing the locations of disaster response facilities for the storage of emergency supplies, which is critical to the quality of service provided in a large scale emergency like an earthquake. In the existing literature, large scale emergency facility location models have either assumed that disaster response facilities will always be functioning and available when required, or that the functioning of a facility is independent of a particular disaster scenario. In this paper new location models are presented that explicitly take into consideration the stochastic nature of the impact a disaster can have on the disaster response facilities and the population centers in surrounding areas. A comparison of the results obtained using our models with those from models available in literature using a case study suggests that the locations suggested by the model in this paper significantly reduce the expected cost of transportation of supplies when we consider the damage a disaster causes to the disaster response facilities and areas near it. Lastly, a distributed approximate algorithm for forming the communication backbone in wireless sensor networks is presented. Some of the most popular routing protocols for wireless sensor networks require a virtual backbone for efficient communication be- tween the sensors. Connected Dominating Sets (CDS) have been studied as a method of choosing nodes to be in the backbone. The traditional approach is to assume that the transmission range of each node is given and then minimize the number of nodes in the CDS representing the backbone. A recently introduced alternative strategy is based on the concept of k-bottleneck connected dominating set (k-BCDS), which, given a positive integer k, minimizes the transmission range of the nodes that ensures a CDS of size k exists in the network. This paper provides a 6-approximate distributed algorithm for the k-BCDS problem. The results of empirical evaluation of the proposed algorithm are also included.

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Sima, Said Athuman. « Integrated stochastic distribution network design : a two-level facility location problem with applications to maize crops transportation in Tanzania ». Thesis, 2015. http://hdl.handle.net/10539/18589.

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thesis submitted to the Faculty of Science in fulfilment of the requirements for the degree of Doctor of Philosophy. March 17, 2015.
A two-level facility location problem (FLP) arose in the transport network of maize crop in Tanzania has been studied. The three layers, namely, production centers (PCs), distribution centers (DCs) and customer points (CPs) are considered in the two-level FLP. The stochastic e ect on the two-level FLP due to rainfall in the network links, between the DCs and CPs, has been studied. The ow of maize crop from PCs to CPs through DCs is designed at a minimum cost under deterministic and stochastic scenarios. The three decisions made simultaneously are: to determine the locations of DCs (including number of DCs), allocation of CPs to the selected DCs, allocation of selected DCs to PCs, and to determine the amount of maize crop transported from PCs to DCs and then from DCs to CPs. We have modelled the problem and generate results by optimizing the model with respect to optimal location-allocation strategies. We have considered two networks, the existing network and an extended network. In the existing network there are four PCs, ve DCs and ninety three CPs. In the extended network three additional DCs are considered. For the modelling purpose we have used the rainfall data from 2007 - 2010 in each week for 17 weeks. The optimized results for the existing network have shown improvements in cost saving compared to the manually operated existing network. In the extended network, the results have shown much more e cient and cost saving distribution system compared to the results of the existing network.

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Livres sur le sujet "Facility location theory"

Zvi, Drezner, et Hamacher Horst, dir. Facility location : Applications and theory. Berlin : Springer, 2002.

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W, Hamacher Horst, et Drezner Zvi, dir. Facility location : Applications and theory. Berlin : Springer, 2001.

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Hurter, Arthur P., et Joseph S. Martinich. Facility Location and the Theory of Production. Dordrecht : Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2518-2.

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Hurter, Arthur P. Facility Location and the Theory of Production. Dordrecht : Springer Netherlands, 1989.

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1950-, Martinich Joseph Stanislaus, dir. Facility location and the theory of production. Boston : Kluwer Academic Publishers, 1989.

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Maßmann, Matthias. Kapazitierte stochastisch-dynamische Facility-Location-Planung : Modellierung und Lösung eines strategischen Standortentscheidungsproblems bei unsicherer Nachfrage. Wiesbaden : Dt. Univ.-Verl., 2006.

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(Editor), Zvi Drezner, et Horst W. Hamacher (Editor), dir. Facility Location : Applications and Theory. Springer, 2001.

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(Editor), Zvi Drezner, et Horst W. Hamacher (Editor), dir. Facility Location : Applications and Theory. Springer, 2004.

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Chan, Yupo. Location Theory and Decision Analysis with Facility. South-Western Educational Publishing, 2000.

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Hurter, Arthur P., et Joseph S. Martinich. Facility Location and the Theory of Production. Island Press, 1989.

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Chapitres de livres sur le sujet "Facility location theory"

Avazbeigi, Milad. « An Overview of Complexity Theory ». Dans Facility Location, 19–36. Heidelberg : Physica-Verlag HD, 2009. http://dx.doi.org/10.1007/978-3-7908-2151-2_2.

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Beckmann, Martin J. « Multiple Facility Location ». Dans Lectures on Location Theory, 71–84. Berlin, Heidelberg : Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-662-03762-1_6.

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Liu, Baoding. « Facility Location Problem ». Dans Theory and Practice of Uncertain Programming, 157–65. Berlin, Heidelberg : Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89484-1_11.

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Kanellopoulos, Panagiotis, Alexandros A. Voudouris et Rongsen Zhang. « Truthful Two-Facility Location with Candidate Locations ». Dans Algorithmic Game Theory, 365–82. Cham : Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-43254-5_21.

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Bhatia, Randeep, Sudipto Guha, Samir Khuller et Yoram J. Sussmann. « Facility location with dynamic distance functions ». Dans Algorithm Theory — SWAT'98, 23–34. Berlin, Heidelberg : Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/bfb0054352.

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Sui, Xin, et Craig Boutilier. « Optimal Group Manipulation in Facility Location Problems ». Dans Algorithmic Decision Theory, 505–20. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-23114-3_30.

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Kyropoulou, Maria, Carmine Ventre et Xiaomeng Zhang. « Mechanism Design for Constrained Heterogeneous Facility Location ». Dans Algorithmic Game Theory, 63–76. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-30473-7_5.

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Filos-Ratsikas, Aris, et Alexandros A. Voudouris. « Approximate Mechanism Design for Distributed Facility Location ». Dans Algorithmic Game Theory, 49–63. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-85947-3_4.

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Hurter, Arthur P., et Joseph S. Martinich. « Deterministic Production/Location Models on Networks ». Dans Facility Location and the Theory of Production, 45–73. Dordrecht : Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2518-2_3.

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Breslau, Lee, Ilias Diakonikolas, Nick Duffield, Yu Gu, MohammadTaghi Hajiaghayi, David S. Johnson, Howard Karloff, Mauricio G. C. Resende et Subhabrata Sen. « Disjoint-Path Facility Location : Theory and Practice ». Dans 2011 Proceedings of the Thirteenth Workshop on Algorithm Engineering and Experiments (ALENEX), 60–74. Philadelphia, PA : Society for Industrial and Applied Mathematics, 2011. http://dx.doi.org/10.1137/1.9781611972917.7.

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Actes de conférences sur le sujet "Facility location theory"

Stanzione, Kaydon, Richard Ruff et Daniel Schrage. « Impact of Aeromedical Evacuation Air Mobility Operations on Autonomous Systems ». Dans Vertical Flight Society 74th Annual Forum & Technology Display, 1–6. The Vertical Flight Society, 2018. http://dx.doi.org/10.4050/f-0074-2018-12845.

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Over the past few years, there has been a growing interest by military services to reduce the risks to aircraft and crew during extraction of wounded soldiers. As recently as this year, the U.S. Army Medical Research and Materiel Command (USAMRMC) is examining initiatives for a next generation trauma care capability centered on autonomous, unmanned, and robotic solutions. While the ultimate goal of trauma care autonomy is to sustain life, the need still exists to extract wounded soldiers via VTOL aircraft. While estimates vary, Air Mobility Command Aeromedical Evacuation (AE) forces support approximately 20,000 combined fixed and rotary wing airlift movements annually. During Vietnam, AE was responsible for transporting 108,000 wounded soldiers from a combat zone to medical facilities. Intra-facility transport accounted for an additional 280,000 troop transports. Last year in the United States, civilian Helicopter Air Ambulance Operations (HAAO) account for the transport of over 500,000 patients annually. HAAO experience, while non-combatant, offers significant experience in operational processes and airlift requirements when there is an emergency involving immediate threat to life, limb, or sight. As military services are challenged with providing soldier location and extraction in austere and ever-increasing hostile environments, there has been numerous air vehicle design configurations proposed and even flight tested to meet the requirements. However, the operational procedures considering air vehicle and patient extraction can be extremely challenging for piloted flight and medical crews. Promising design solutions are a result of recent developments in electric VTOL (eVTOL) technologies. Distributed Electric Propulsion (DEP) solutions allow designers flexibility in locating propulsors and eliminating fossil fuel systems. These advancements result in structural designs that are more conducive to patient ingress and egress. In addition to structural design flexibility, eVTOL designs offer other benefits versus Internal Combustion Engines (ICE) counterparts to include reduced acoustic and thermal signatures and greater agility and maneuverability while eliminating the required pilot and aircrew resting periods during up-tempo operations. Autonomous air vehicle design considerations for Air Mobility Aeromedical Evacuation are developed based on HAA and US Armed Forces airlift experience with avionics, flight procedures, and air crew operations.

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Puerto, Justo, Arie Tamir et Federico Perea. « Some new cooperative coverage facility location games ». Dans the Behavioral and Quantitative Game Theory. New York, New York, USA : ACM Press, 2010. http://dx.doi.org/10.1145/1807406.1807484.

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Patil, Pavan, David Merkl et Doina Logofatu. « Mobile Facility Location Problem : Practical Examples and Solution modeling ». Dans 2020 24th International Conference on System Theory, Control and Computing (ICSTCC). IEEE, 2020. http://dx.doi.org/10.1109/icstcc50638.2020.9259670.

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Ngo, Hung Q., Sungyoung Lee et Young-Koo Lee. « Factor graph approach to distributed facility location in large-scale networks ». Dans 2009 IEEE International Symposium on Information Theory - ISIT. IEEE, 2009. http://dx.doi.org/10.1109/isit.2009.5205590.

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Wang, Jinmei, et Kejia Zhuang. « Study of Facility Location and Allocation Problem Based on Fuzzy Graph Theory ». Dans 2010 International Conference on Management and Service Science (MASS 2010). IEEE, 2010. http://dx.doi.org/10.1109/icmss.2010.5577858.

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Dejian, Yu, Zhou Dequn et He Xiaorong. « A weighted grey target theory-based strategy model for emergency facility location ». Dans 2009 IEEE International Conference on Grey Systems and Intelligent Services (GSIS 2009). IEEE, 2009. http://dx.doi.org/10.1109/gsis.2009.5408086.

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Zhang, Ming, Yufeng Zhao, Tianfang Gao, Fangxin Hou et Peipei Chen. « An Experimental Study on Critical Heat Flux in Rectangular Channel With Different Angle of Inclination ». Dans 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66275.

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It is a hot research field to study the Critical Heat Flux (CHF) occurrence mechanism in boiling heat transfer. Although lots of researchers have studied on it, no unified conclusion has been achieved up to now. The proposed CHF occurrence mechanism is also not widely accepted. Because the void fraction close to the heating surface is larger when the heat flux approaches CHF, it is difficult to make visual observations of the boiling heat transfer on the heating surface. Usually the CHF mechanism is based on certain assumptions, and then confirmed by testing. Therefore, it is meaningful to study the occurrence of CHF by experimental methods. Based on the system design of the test system for CHF in a rectangular channel, an experimental facility was set up. The main test section consists of a rectangular flow channel with the copper heating surface downwards mounted into one of the channel walls. The fluid is deionized water. Fluid subcooling is 15 K. The entire test section is mounted on a rotating arm which can be set at different inclination angles from 0° (horizontal) to 90° (vertical). By adjusting the loop, the natural circulation and forced circulation test conditions can be achieved from the experimental facility. Through test research, visual observations are acquired about the bubble growth characteristics in the rectangular channel in the range of 0 ° to 90 °, and the test data about the CHF is also attained. It is found that under the condition of forced circulation and natural circulation, the CHF values is increased effectively with the improved mass flow rate and the increased inclination angles of the test section. Through visual observation, it is found that in forced circulation conditions, CHF occurs first at the entrance location of the test surface, rather than the maximal heat flux location of the test surface (test surface center) or the maximal local void fraction of the test facility (exit location of the test facility). In the natural circulation conditions, CHF occurs first at the exit location of the test facility. This phenomenon may imply that the mechanisms of CHF are different in forced circulation and natural circulation. In forced circulation, the flow plays a main role. In natural circulation, the local void fraction plays a main role. There are some differences in the experimental phenomena compared with the traditional CHF theory, like the bubble crowding theory and the micro fluid layer theory. Through the experiment research, the complexity of the flow boiling heat transfer was found. The flow and boiling heat transfer affect each other. It is can help us to research the CHF theory in flow boiling heat transfer.

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Pessoa, João, Carl Trygve Stansberg, Nuno Fonseca et Manuel Laranjinha. « Experimental and Numerical Study of the Free Surface Elevation Over the Pontoons of a Semisubmersible Platform in Waves ». Dans ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78009.

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The region over the pontoons, especially in the vicinity of columns, is typically a critical area in terms of upwell when analyzing the air gap of semisubmersible platforms. There is indication that numerical computations using potential flow theory may in some cases overestimate the free surface elevation in this region. To assess the possibility, experimental data is compared to numerical computations in three locations under the deck box: one location over the pontoons, one location in the vicinity of the pontoons and one location between the pontoons. The data was acquired in FORCE’s towing tank facility, in Lyngby, Denmark, by relative wave gauges fixed to the moored semisubmersible platform. The experimental data is treated in order to remove the global motions from the upwell signal. The resulting free surface elevation, which includes contributions from incident, diffracted and radiated wave fields, is compared to the disturbed free surface elevation calculated with linear diffraction-radiation theory. The study is initially conducted in irregular waves, where simulation statistics in 4 different sea states are compared to the experiments and the observed nonlinear effects are discussed. The extreme crest heights are compared with non-Gaussian models as defined in DNVGL-OTG-13 and as defined by Stansberg (2014). The study is then extended to regular waves. In a first stage we estimate the first harmonic components by removing all higher order effects, and compare the results to linear theory. For these band-pass filtered signals it is shown that results calculated with linear theory tend to overestimate free surface elevation in the location over the pontoons, but seem to correlate well with the experiments in the other locations. In a second stage the experimental crest heights are compared with non-linear models as defined in DNVGL-OTG-13 and as defined by Stansberg (2014). It is shown in this case study that the maximum free surface elevation over the pontoons in front of upwave columns can be severely overestimated if calculated with the current state of the art numerical models, which are based on linear diffraction-radiation theory. We explain the observed discrepancy in this case primarily by a very high linear predicted amplification induced by the shallow pontoon, with resulting high local steepness leading to local breaking and dissipation. Therefore, such pontoon effects should be addressed in semisubmersible platform air-gap analysis. The work also highlights the importance of having good experimental data available when preforming such analysis.

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Botros, K. K., C. Foy et B. Chmilar. « Application of Dynamic Programming in Long-Range Pipeline Facility Planning and in Assessing Off-Design and Off-Flow-Forecast Trajectories ». Dans 2008 7th International Pipeline Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ipc2008-64154.

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Dynamic programming (DP) inherently provides a methodology for evaluating a series of decisions in order to determine an optimal policy or path forward. The methodology basically enumerates and evaluates alternative states over the planning horizon in formulating the optimum strategy. In the present work, the concept of DP has been applied to pipeline long-range facility planning problems, and further extended to allow evaluation of nth optimum pipeline facility deployments based on cost and/or probabilities of constraints. The best four options were further analyzed considering uncertainties in the cost elements and the resulting economic risk associated with each optimum path. This paper presents the theory behind the extension of the DP methodology to pipeline long-range facility-planning problems over a planning horizon that considers inherent uncertainties in gas supply and demand as well as a range of available facility options. Uncertainties in the size and location of the required facilities to handle the forecast volumes, and associated variances in their respective cost to build and operate the various facilities, are all accounted for. The problem is further complicated by the possible changes in the expected flow from that forecast during design and the resulting penalties associated with the under- or over-sizing of facilities. It was demonstrated that it is important that the off-design flow forecast be evaluated to determine the impact of future variability or changes. The value that the organization can derive from being able to quantify the benefit (or penalty) of forecast uncertainty and over- or under-building long-range facilities, is significant.

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Krogmann, Simon, Pascal Lenzner, Louise Molitor et Alexander Skopalik. « Two-Stage Facility Location Games with Strategic Clients and Facilities ». Dans Thirtieth International Joint Conference on Artificial Intelligence {IJCAI-21}. California : International Joint Conferences on Artificial Intelligence Organization, 2021. http://dx.doi.org/10.24963/ijcai.2021/41.

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We consider non-cooperative facility location games where both facilities and clients act strategically and heavily influence each other. This contrasts established game-theoretic facility location models with non-strategic clients that simply select the closest opened facility. In our model, every facility location has a set of attracted clients and each client has a set of shopping locations and a weight that corresponds to its spending capacity. Facility agents selfishly select a location for opening their facility to maximize the attracted total spending capacity, whereas clients strategically decide how to distribute their spending capacity among the opened facilities in their shopping range. We focus on a natural client behavior similar to classical load balancing: our selfish clients aim for a distribution that minimizes their maximum waiting time for getting serviced, where a facility’s waiting time corresponds to its total attracted client weight. We show that subgame perfect equilibria exist and we give almost tight constant bounds on the Price of Anarchy and the Price of Stability, which even hold for a broader class of games with arbitrary client behavior. Since facilities and clients influence each other, it is crucial for the facilities to anticipate the selfish clients’ behavior when selecting their location. For this, we provide an efficient algorithm that also implies an efficient check for equilibrium. Finally, we show that computing a socially optimal facility placement is NP-hard and that this result holds for all feasible client weight distributions.

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Rapports d'organisations sur le sujet "Facility location theory"

Vaughn, Tim, et Daniel Olsen. PR-179-19601-R03 Evaluation of Online Analyzers for Multiple Gas Contaminants-Field Test. Chantilly, Virginia : Pipeline Research Council International, Inc. (PRCI), septembre 2022. http://dx.doi.org/10.55274/r0012242.

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Operating companies currently use several analyzers per location to monitor gas streams throughout their operations. By replacing multiple analyzers with a single analyzer capable of measuring multiple contaminants, both capital and operations and maintenance expenditures can be reduced. A field trial of two commercially available on-line analyzers was conducted between February 2021 and February 2022. The analyzers (ABB LGR-ICOS 950, AP2e ProCeas) were sited at an operational gas compression facility, whose own process gas analyzers were used as reference analyzers for comparison ("Site Ref"). Measured data for contaminant species (CO2, O2, H2S, and H2O) were recorded at 5-second intervals, collected remotely, and compared to hourly data provided by site reference analyzers. Related webinar.

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McKean, Adam P., Zachary W. Anderson, Donald L. Clark, Diego Fernandez, Christopher R. Anderson, Tiffany A. Rivera et Taylor K. McCombs. Detrital Zircon U-Pb Geochronology Results for the Bountiful Peak, Coalville, James Peak, Mount Pisgah, Paradise, and Payson Lakes 7.5' Quadrangles, Utah. Utah Geological Survey, mai 2022. http://dx.doi.org/10.34191/ofr-743.

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This Open-File Report makes available raw analytical data from laboratory analysis of U-Pb ages of zircon grains from samples collected during geologic mapping funded by the U.S. Geological Survey (USGS) National Cooperative Geologic Mapping Program (STATEMAP) and the Utah Geological Survey (UGS). The references listed in table 1 provide additional information such as sample location, geologic setting, and interpretation of the samples in the context of the area where they were collected. The data were prepared by the University of Utah Earth Core Facility (Diego Fernandez, Director), under contract to the UGS. These data are highly technical in nature and proper interpretation requires considerable training in the applicable geochronologic techniques.

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Hu, Xiaoqiang, Jieyi Bao, Yi Jiang et Shuo Li. Highway Lighting Test Bed on INDOT Facility (Off-Roadway). Purdue University, 2022. http://dx.doi.org/10.5703/1288284317384.

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According to the National Highway Traffic Safety Administration (NHTSA), during 2016 there were 7,277,000 vehicle crashes nationally. Among them, approximately 70% happened during the daytime and around 30% of crashes occurred during the nighttime. There were 11,375 nighttime fatal crashes that account for about 48% of total fatal crashes (23,714). Given the fact that only 25%–33% of the vehicle miles traveled (VMT) occur at night, the above statistics indicate that the nighttime crash fatality rate is much higher and nighttime crashes are usually more severe compared to daytime crashes. Providing lighting on roadways is one of the proven safety countermeasures for preventing crashes and reducing fatalities. In particular, lighting at roadway intersections can reduce vehicle crashes by 10% to 26%. Currently, to conduct lighting field testing, INDOT is using several in-service highways, intersections, interchanges, and rest areas. These locations require traffic control and lane closures, which raises safety concerns and causing inconvenience to the public. In addition to the cost and safety concerns, during the evaluation period the new luminaires being tested actually functioned as lighting sources in place of the existing luminaires that were removed in order to install the new luminaires. This means that the new luminaries were used for roadway lighting at the test sites even before they were proven to meet the roadway lighting requirements. To eliminate traffic control and potential safety concerns, it was proposed to create test beds for field evaluating and to verify the performance of new lighting technologies and luminaires in a controlled, standard setting. Through this study, two lighting test bed facilities were designed and constructed. Illuminance values of installed luminaires were manually measured by a remotely controlled electric cart and drone. The measured illuminance values were analyzed and the analysis indicated that the efficiency of illuminance measurement can be significantly improved by automated methods. An illuminance data repository model was developed to be an effective tool that can greatly facilitate data input and storage process. The use of this model will further increase the productivity of illuminance measurement at the lighting test beds.

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Kerber, Steve. Impact of Ventilation on Fire Behavior in Legacy and Contemporary Residential Construction. UL Firefighter Safety Research Institute, décembre 2014. http://dx.doi.org/10.54206/102376/gieq2593.

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Under the United States Department of Homeland Security (DHS) Assistance to Firefighter Grant Program, Underwriters Laboratories examined fire service ventilation practices as well as the impact of changes in modern house geometries. There has been a steady change in the residential fire environment over the past several decades. These changes include larger homes, more open floor plans and volumes and increased synthetic fuel loads. This series of experiments examine this change in fire behavior and the impact on firefighter ventilation tactics. This fire research project developed the empirical data that is needed to quantify the fire behavior associated with these scenarios and result in immediately developing the necessary firefighting ventilation practices to reduce firefighter death and injury. Two houses were constructed in the large fire facility of Underwriters Laboratories in Northbrook, IL. The first of two houses constructed was a one-story, 1200 ft, 3 bedroom, bathroom house with 8 total rooms. The second house was a two-story 3200 ft, 4 bedroom, 2.5 bathroom house with 12 total rooms. The second house featured a modern open floor plan, two- story great room and open foyer. Fifteen experiments were conducted varying the ventilation locations and the number of ventilation openings. Ventilation scenarios included ventilating the front door only, opening the front door and a window near and remote from the seat of the fire, opening a window only and ventilating a higher opening in the two-story house. One scenario in each house was conducted in triplicate to examine repeatability. The results of these experiments provide knowledge for the fire service for them to examine their thought processes, standard operating procedures and training content. Several tactical considerations were developed utilizing the data from the experiments to provide specific examples of changes that can be adopted based on a departments current strategies and tactics.

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Kerber, Steve. Study of the Effectiveness of Fire Service Vertical Ventilation and Suppression Tactics in Single Family Homes. UL Firefighter Safety Research Institute, juin 2013. http://dx.doi.org/10.54206/102376/iwzc6477.

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Under the United States Department of Homeland Security (DHS) Assistance to Firefighter Grant Program, Underwriters Laboratories examined fire service ventilation and suppression practices as well as the impact of changes in modern house geometries. There has been a steady change in the residential fire environment over the past several decades. These changes include larger homes, more open floor plans and volumes, and increased synthetic fuel loads. This investigation examined the influence of these changes to the fire behavior and subsequent impact on firefighter tactics relative to horizontal and vertical ventilation and suppression. It is anticipated that the results of this investigation will be incorporated into improved firefighting tactics and decision making to reduce firefighter injuries and fatalities. Vertical ventilation has been used successfully but also resulted in firefighter fatalities in the past, as it is not easily coordinated with suppression and other fire ground tasks such as horizontal ventilation. It is not straightforward for firefighters to train on the effects of vertical ventilation since fire service training structures and props do not allow for ventilation-limited fire conditions with representative fuel loads and floor plans that will be encountered on the fire ground. Thus, guidance on the effectiveness of vertical ventilation comes from experience gained during real incidents, but under many different fire ground conditions. This has made it difficult to develop comprehensive guidance on the coordination of vertical ventilation with other firefighter tactics, and how these tactics may influence the fire dynamics in the burning home. The purpose of this study was to improve the understanding of the fire dynamics associated with the use of vertical ventilation so that it may be more effectively deployed on the fire ground. Two houses were constructed in the large fire facility of Underwriters Laboratories in Northbrook, IL. The first house was a one-story house (1200 ft, three bedrooms, one bathroom) with a total of 8 rooms. The second house was a two-story house (3200 ft, four bedrooms, two and a half bathrooms) with a total of 12 rooms. The second house featured a modern open floor plan, two-story great room and open foyer. A total of seventeen experiments were conducted varying the ventilation locations and the number of ventilation openings. Ventilation scenarios included ventilating the front door and a window near the seat of the fire (with modern and legacy furnishings) to link to the previous research on horizontal ventilation, opening the front door and ventilating over the fire and remote from the fire. Additional experiments examined controlling the front door, making different sized ventilation holes in the roof and the impact of exterior hose streams. The results from the experiments led to identification of tactical considerations for the fire service to integrate into their education and fire ground strategies and tactics where applicable.

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Joint Report on MDB Climate Finance 2013. Inter-American Development Bank, septembre 2014. http://dx.doi.org/10.18235/0006468.

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This is the third edition of the joint MDB Report on Climate Finance and the information provided has been expanded to include a better sectoral breakdown, and split by public and private operations. Multilateral Development Banks (MDBs) provided USD 23.8 billion in financing in 2013 to address the challenges of climate change and, since 2011, have provided over USD 75 billion in climate finance to developing and emerging economies. Of the total USD 23.8 billion in climate finance, 80%, or USD 18.9 billion, was dedicated to mitigation and 20%, or USD 4.8 billion, to adaptation. Of the total commitments, 9%, or USD 2.2 billion, came from external resources, such as bilateral or multilateral donors, including the Global Environment Facility and the Climate Investment Funds. This report covers finance for mitigation, adaptation and projects with dual adaptation and mitigation benefits. As in previous years, the calculation of mitigation finance is based on a common list of activities at the intersection of what all MDBs consider mitigation. Adaptation finance is calculated using the joint MDB methodology based on a context- and location-specific approach. Data reported in both cases corresponds to the financing of those components and/or sub-components or elements/proportions of projects that providemitigation and/or adaptation benefits (rather than the entire project cost). Some MDBs have different internal accounting approaches for mitigation. In such cases, the volume of each MDB's climate finance mitigation calculated using their internal methodologies is separately reported. The regional coverage for 2013 is quite balanced with two regions (East Asia and Pacific, Non-EU Europe and Central Asia) each receiving roughly 20% of total climate finance provided and four regions (South Asia, Sub-Saharan Africa, Latin America and Caribbean, EU New Member States) 10-15% each. In regards to sector coverage, 22% of adaptation finance went to "Coastal and riverine infrastructure (including built flood protection infrastructure)" and 30% to the category comprising "Energy, transport, and other built environment and infrastructure". In mitigation finance, renewable energy still takes by far the largest share, with 25% of the total.

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