Thematische Bibliographien / Fixed fleet

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Auswahl der wissenschaftlichen Literatur zum Thema „Fixed fleet“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 12. Februar 2022

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Zeitschriftenartikel zum Thema "Fixed fleet"

Cissé, A. A., S. Gourguet, L. Doyen, F. Blanchard und J. C. Péreau. „A bio-economic model for the ecosystem-based management of the coastal fishery in French Guiana“. Environment and Development Economics 18, Nr. 3 (28.02.2013): 245–69. http://dx.doi.org/10.1017/s1355770x13000065.

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AbstractThis paper offers a theoretical and empirical model of ecosystem-based fishery management. A multi-species and multi-fleet model integrating Lotka–Volterra trophic dynamics as well as production and profit assessments is developed and applied to the coastal fishery of French Guiana. This small-scale fishery constitutes a challenging example with high fish biodiversity, several non-selective fleets and a potentially increasing local food demand due to demographic growth. The dynamic model is calibrated with 13 species and four fleets using monthly catch and effort data from 2006 to 2009. Several contrasted fishing scenarios including status quo, total closure, economic and viable strategies are then simulated. They are compared from the viewpoints of both biodiversity preservation and socioeconomic performance, assuming fixed landing prices and fixed costs. We show that fishing outputs, including food supply and fleet profitability, can be sustained on average but a loss of species cannot be avoided.

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Kwon, Yong-Ju, Young-Jae Choi und Dong-Ho Lee. „Heterogeneous fixed fleet vehicle routing considering carbon emission“. Transportation Research Part D: Transport and Environment 23 (August 2013): 81–89. http://dx.doi.org/10.1016/j.trd.2013.04.001.

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Mendes, Lucas Mestres, Manel Rivera Bennàssar und Joseph Y. J. Chow. „Comparison of Light Rail Streetcar Against Shared Autonomous Vehicle Fleet for Brooklyn–Queens Connector in New York City“. Transportation Research Record: Journal of the Transportation Research Board 2650, Nr. 1 (Januar 2017): 142–51. http://dx.doi.org/10.3141/2650-17.

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Policy makers predict that autonomous vehicles will have significant market penetration in the next decade or so. In several simulation studies shared autonomous vehicle fleets have been shown to be effective public transit alternatives. This study compared the effectiveness of a shared autonomous vehicle fleet with an upcoming transit project proposed in New York City, the Brooklyn–Queens Connector light rail project. The study developed an event-based simulation model to compare the performance of the shared autonomous vehicle system with the light rail system under the same demand patterns, route alignment, and operating speeds. The simulation experiments revealed that a shared autonomous vehicle fleet of 500 vehicles of 12-person capacity (consistent with the EZ10 vehicle) would be needed to match the 39-vehicle light rail system if operated as a fixed-route system. However, as a demand-responsive system, a fleet of only 150 vehicles would lead to the same total travel time (22 min) as the 39-vehicle fleet light rail system. Furthermore, a fleet of 450 12-person vehicles in a demand-responsive operation would have the same average wait times while reducing total travel times by 36%. The implications for system resiliency, idle vehicle allocation, and vehicle modularity are discussed.

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Matthopoulos, Panagiotis Petros, und Stella Sofianopoulou. „A Firefly Algorithm for the Heterogeneous Fixed Fleet VRP“. International Journal of Industrial and Systems Engineering 33, Nr. 2 (2019): 1. http://dx.doi.org/10.1504/ijise.2019.10016698.

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Marchal, Paul, L. Richard Little und Olivier Thébaud. „Quota allocation in mixed fisheries: a bioeconomic modelling approach applied to the Channel flatfish fisheries“. ICES Journal of Marine Science 68, Nr. 7 (06.06.2011): 1580–91. http://dx.doi.org/10.1093/icesjms/fsr096.

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Abstract Marchal, P., Little, L. R., and Thébaud, O. 2011. Quota allocation in mixed fisheries: a bioeconomic modelling approach applied to the Channel flatfish fisheries. – ICES Journal of Marine Science, 68: 1580–1591. A simulation modelling approach is used to assess the respective performances of different regimes of quota allocation (fixed or transferable), quota ownership (owned or not by fishers), and taxation for catching fish above quota. The simulations account for a variety of fleet behaviours (ranging from fixed by tradition to dynamic economics-driven). The modelling framework is applied to the Channel flatfish mixed fisheries. Transferable quota allocation regimes would particularly benefit small netters and beam trawlers, which would achieve a profit of €50–150 million without compromising the conservation of eastern Channel sole, but it could impair the sustainability of other stocks. If quota is owned by fishers, the least fishing-efficient fleet stops fishing, but makes substantial profit from leasing quotas to beam trawlers and to small and large netters, which remain actively fishing. The highest economic return for quota owners (€200–300 million) is achieved when effort allocation is fixed by tradition. The profit achieved by small netters is greatest when fleets are almost entirely economics-driven. Increasing overquota landing taxes generally leads to conservation benefits for all stocks, but at the expense of lower profitability for the fishery overall.

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Maravelias, Christos D., Richard Hillary, John Haralabous und Efthymia V. Tsitsika. „Stochastic bioeconomic modelling of alternative management measures for anchovy in the Mediterranean Sea“. ICES Journal of Marine Science 67, Nr. 6 (12.03.2010): 1291–300. http://dx.doi.org/10.1093/icesjms/fsq018.

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Abstract Maravelias, C. D., Hillary, R., Haralabous, J., and Tsitsika, E. V. 2010. Stochastic bioeconomic modelling of alternative management measures for anchovy in the Mediterranean Sea. – ICES Journal of Marine Science, 67: 1291–1300. The purse-seine fishery for anchovy in the Aegean Sea consists of two main fleet segments (12–24 and 24–40 m vessels); this paper investigates economically and biologically preferable effort and capacity scenarios for the fishery. Attention is paid to a bioeconomic analysis of fleets composed of segments with varying levels of efficiency (in terms of catch rate) and costs (fixed and variable) and the role this might play in optimal effort allocation at a fleet level. An age-structured stochastic bioeconomic operating model for Aegean anchovy (Engraulis encrasicolus) is constructed. It attempts to account robustly for the multiple uncertainties in the system, including (i) the effort–fishing mortality relationship, (ii) the selectivity, and (iii) the stock–recruit dynamics of the population. A method is proposed for determining the economically optimal level of long-term effort in a fishery such as this, with similar characteristics in terms of stock dynamics, fishery, and markets. Lower values of effort and capacity are predicted to yield greater future profit when viewing the fleet in its entirety, but even lower values may be advisable to maintain the long-term biological integrity of the stock. The results may prove useful in balancing the productivity of the stock with the harvesting capacity of the fleet, while managing to ensure the long-term profitability of the fleet along with the sustainability of the resource.

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Avila-Torres, Paulina A., Nancy M. Arratia-Martinez und Efraín Ruiz-y-Ruiz. „The Inventory Routing Problem with Priorities and Fixed Heterogeneous Fleet“. Applied Sciences 10, Nr. 10 (19.05.2020): 3502. http://dx.doi.org/10.3390/app10103502.

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This paper presents a new combinatorial optimization problem, the inventory routing problem with priorities, and a fixed heterogeneous fleet. In this problem, a particular set of customers has to be served before the rest of the customers using vehicles with different capacities. The problem is inspired by the current situation faced by a specialized gas distribution company in the northeast region of Mexico. The company produces and distributes three main products, although this paper focuses only on the oxygen distribution problem. The company delivers oxygen to industrial customers, as well as hospitals and other medical facilities. Due to Mexican government regulations, the company requires prioritizing deliveries to hospitals and medical facilities over its industrial customers. Therefore, the company is obliged to satisfy the customers demand considering inventory levels and priority constraints while minimizing the inventory and routing cost. An integer programming model is proposed to solve the problem. The model minimizes the total distribution cost while considering inventory level, priority constraints, and a fixed fleet of vehicles with different capacities. Finally, computational experiments were carried out using benchmark instances to validate the correctness of the proposed model and to analyze the effect of priorities on the total distribution cost. Finally, actual customers of the company were selected to show the effectiveness of the proposed model to solve real-world problems.

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Tsakiri, M., M. Stewart, T. Forward, D. Sandison und J. Walker. „Urban Fleet Monitoring with GPS and GLONASS“. Journal of Navigation 51, Nr. 3 (September 1998): 382–93. http://dx.doi.org/10.1017/s0373463398007929.

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The increasing volume of traffic in urban areas has resulted in steady growth of the mean driving time on fixed routes. Longer driving times lead to significantly higher transportation costs, particularly for vehicle fleets, where efficiency in the distribution of their transport tasks is important in staying competitive in the market. For bus fleets, the optimal control and command of the vehicles is, as well as the economic requirements, a basic function of their general mission. The Global Positioning System (GPS) allows reliable and accurate positioning of public transport vehicles except within the physical limitations imposed by built-up city ‘urban canyons’. With a view to the next generation of satellite positioning systems for public transport fleet management, this paper highlights the limitations imposed on current GPS systems operating in the urban canyon. The capabilities of a future positioning system operating in this type of environment are discussed. It is suggested that such a system could comprise receivers capable of integrating the Global Positioning System (GPS) and the Russian equivalent, the Global Navigation Satellite System (GLONASS), and relatively cheap dead-reckoning sensors.

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García Albarracín, Andrés Felipe, und Daniel Jaramillo-Ramírez. „Limited-Stop High-Frequency Service Design: Reducing In-Vehicle Congestion“. Journal of Advanced Transportation 2019 (02.07.2019): 1–9. http://dx.doi.org/10.1155/2019/5745870.

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Limited-Stop (LS) bus services have recently proved to be essential for improving user welfare and reducing operators’ costs in many cities. The design of LS services has been mainly focused on increasing fleet efficiency and reducing the passengers’ travel time. In this work, we change the focus of LS service design towards the user’s comfort. Given a fixed-size fleet (fixed costs) and a fixed demand on a very high-frequency bus corridor, we propose an algorithm to minimize the peak load profile, combining the usual All-Stop (AS) and one additional LS service, finding the set of stops for the LS service and the fleet split. The strategy is proved in a set of statistically generated corridors, showing average capacity reductions > 20% at a cost of a marginal travel time increase. Analyzing the peak value in the load profile of all simulated corridors, the number of cases where the majority of users would find a seat on the bus increases from 15% to 53%, making the services much more attractive without increasing the costs.

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Luo, Xiaoling, Yangsheng Jiang, Zhihong Yao, Youhua Tang und Yuan Liu. „Designing Limited-Stop Transit Service with Fixed Fleet Size in Peak Hours by Exploiting Transit Data“. Transportation Research Record: Journal of the Transportation Research Board 2647, Nr. 1 (Januar 2017): 134–41. http://dx.doi.org/10.3141/2647-16.

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Efficiently designed limited-stop transit service is an attractive way to respond to high commuter travel demand in which trips concentrate on a few origin–destination pairs during peak hours. Such service is redesigned in many metropolises in China. Some research has dealt with this situation; bus fleet size was assumed to be unlimited, and the research was concerned with the average daily passenger flow rather than the specific average peak hour travel demand. In contrast to previous work, this paper presents an approach to design limited-stop transit service with the existing available fleet size from current normal service and focuses only on peak hour travel demand extracted through exploitation of transit data. First, a model for limited-stop service was proposed to minimize user costs through existing fixed fleet size. A heuristic algorithm was developed to search the transit line structure for limited-stop service instead of selecting lines from the predefined set. Next, a case in Chengdu, China, was tested. The results indicate that up to 9.32% of total travel time can be saved with the fixed fleet size when limited-stop transit service is applied. Finally, different proportions of commuter flow and different travel behaviors are discussed to illustrate the performance of limited-stop service for different scenarios.

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Mehr Quellen

Dissertationen zum Thema "Fixed fleet"

Beránek, Michal. „Evoluční optimalizace nákladní přepravy“. Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2021. http://www.nusl.cz/ntk/nusl-445582.

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The following thesis deals with optimization of freight transport planning. The goal is to minimize expenses connected to transportation, which emerge from travelled distance. The expenses can be heavily reduced, if the routes are correctly planned, especially when there is a large number of customers to be served. This thesis focuses on solving the problem by using the evolutional algorithms, that are optimization methods based on principles of evolution. Thesis concentrates on Heterogeneous Fixed Fleet Vehicle Routing Problem. Thesis introduces multiple evolutional algorithms and their results are compared. The best algorithm, evolutional strategy with local neighbourhood search, achieves similar, for certain tasks even better results, than other existing evolutional algorithms, created to solve given problem.

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Wu, Tsung-Hsun, und 吳宗勳. „Using Heuristics to Solve Heterogeneous Fixed Fleet Vehicle Routing Problem“. Thesis, 2012. http://ndltd.ncl.edu.tw/handle/17057375421423728727.

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碩士
國立交通大學
運輸科技與管理學系
100
The Heterogeneous Fixed Fleet Vehicle Routing Problem (HFFVRP) is a variant of vehicle routing problem (VRP). Unlike classical VRP, the HFFVRP considers a fixed size of fleet with different types and variable costs of vehicles. In this paper, we apply Backtracking Adaptive Threshold Accepting (BATA) for solving HFFVRP. According to characteristic of the problem, we developed a vehicle type improvement mechanism which can find a neighborhood solution with a better vehicle type combination. Our proposed meta-heuristic is tested on a set of 18 benchmark instances including 8 instances from Taillard, 5 instances from Li et al. and 5 instances from Brandao. Results showed that our proposed methods have generated 1 best know solution (BKS). The average deviation of all the tested instances is 3.04%.

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Fang, Chien-Hao, und 方建皓. „Using Restart TA Metaheuristic Method to Solve Heterogeneous Fixed Fleet Vehicle Routing Problem“. Thesis, 2013. http://ndltd.ncl.edu.tw/handle/58699657075787366427.

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碩士
國立交通大學
運輸與物流管理學系
101
The Heterogeneous Fixed Fleet Vehicle Routing Problem (HFFVRP) is a variant of the conventional Vehicle Routing Problem (VRP). Compared with VRP, HFFVRP considers a fixed size of fleet with different types and variable costs of vehicles. There are three steps in our proposed Meta-heuristics. At first, we adopted the Route First-Cluster Second method with considering average cost of used full loading vehicle types to construct the initial solution. And then use Cross exchange, 2-Opt*, US, 2-Opt and Or-Opt to improve the initial solution. Finally, we applied Restart Threshold Accepting to escape the local optimal solution. Moreover, we also conducted some multiple-start solution experiments to solve HFFVRP. We compared our best results with best known solutions (BKS) of HFFVRP benchmark instances. It showed that our proposed methods have generated 2 breakthrough solutions and 5 reaching BKS. The average deviation of all the tested instances is 1.10%.

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Chang, shao-yu, und 張紹俞. „A Study of Interhub Heterogeneous Fleet Routing Problem for the Fixed-Route Trucking Carriers“. Thesis, 2010. http://ndltd.ncl.edu.tw/handle/63045923175878411422.

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碩士
中華大學
運輸科技與物流管理學系碩士班
98
In order to fulfill the customer requirements, the fixed-route carriers build up the operational framework consisting of intra-network and extra-network to improve their efficiency of distribution. However, the route arrangement of the intra-network is very complicated, and related research is scarce. Therefore, the purpose of this study is to propose a model, named as the Interhub Heterogeneous Fleet Routing Problem (IHFRP), to deal with the route design of intra-network for the fixed route carriers. In addition, we proposed a threshold-based meta-heuristic procedure, TA_IHFRP, to be capable of solving the IHFRP. The proposed TA_IHFRP procedure is composed of two-stage strategies and three executive modules in solving the IHFRP. In the first stage, the Initial Solution Construction (ISC) module adopts modified insertion heuristics to generate a feasible initial solution under the objective of minimizing used vehicle numbers. Then, in the second stage, the Neighborhood Search (NS) module and Threshold Accepting (TA) module are utilized to improve the vehicle usage cost and the traveling distance of previous initial solution. The NS module includes three heuristics: 1-0 inter-route O-D pair exchange, 1-1 inter-route O-D pair exchange, and route reduction. Moreover, we design a Route Reconstruction sub-procedure in the NS and TA modules to improve the efficiency of execution. In order to identify the feasibility of TA_IHFRP, we created a set of 36 IHFRP instances, coded the computer program of the proposed TA_IHFRP in Visual C# 2005 and conducted the computational tests on a Core(TM)2 Due PC. Experimental results indicated that the proposed TA_IHFRP is an efficient and effective method to solve the IHFRP. Furthermore, the IHFRP model also provides a considerable way to reduce the operational cost of the fixed-route carriers.

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Bücher zum Thema "Fixed fleet"

Sturtivant, Ray. Fleet air arm fixed-wing aircraft since 1946. Tonbridge: Air Britain (Historians) Ltd., 2004.

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Coal-Fueled Electricity Generation: Fleet Outlook, Potential Changes and Impact of EPA Regulations. Nova Science Pub Inc, 2013.

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Buchteile zum Thema "Fixed fleet"

Gan, Xiaobing, Lijiao Liu, Ben Niu, L. J. Tan, F. F. Zhang und J. Liu. „SRBFOs for Solving the Heterogeneous Fixed Fleet Vehicle Routing Problem“. In Intelligent Computing Theories and Methodologies, 725–32. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-22186-1_72.

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Gan, X. B., L. J. Liu, J. S. Chen und Ben Niu. „Comprehensive Learning PSO for Solving Environment Heterogeneous Fixed Fleet VRP with Time Windows“. In Lecture Notes in Computer Science, 424–32. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-41009-8_46.

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Bertoluci, Ricardo, António G. Ramos, Manuel Lopes und João Bastos. „Capacitated Vehicle Routing Problem with Heterogeneous Fixed Proprietary Fleet and Outsourcing Delivery—A Clustering-Based Approach“. In Operational Research, 43–55. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-10731-4_4.

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Yakıcı, Ertan, Mumtaz Karatas und Oktay Yılmaz. „The Problem of Locating and Routing Unmanned Aerial Vehicles“. In Operations Research for Military Organizations, 28–53. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-5513-1.ch002.

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In this chapter, locating and routing of a UAV fleet is discussed. Since the research in the location and routing of UAVs is very limited, the related problems are reviewed. A basic problem and its extended version found in the literature are redefined along with their MILP formulation. Both of the problems are characterized by a prize collecting objective function and a homogeneous fleet of fixed number of UAVs based on naval platforms. The aim is described as maximization of the collected importance value associated to interest points. A solution method that is based on ACO is discussed. The usage of this robust method for both the basic and the extended versions of the problem is explained. The improvement room in the present solution method and future research directions are also discussed.

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Yakıcı, Ertan, Mumtaz Karatas und Oktay Yılmaz. „The Problem of Locating and Routing Unmanned Aerial Vehicles“. In Research Anthology on Reliability and Safety in Aviation Systems, Spacecraft, and Air Transport, 1067–91. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-5357-2.ch043.

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Leurent, Fabien. „Towards Shared Mobility Services in Ring Shape“. In Transportation Systems for Smart, Sustainable, Inclusive and Secure Cities [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94410.

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A shared mobility service (SMS) under ring shape would combine the principle of service cycle along a fixed route (as in a transit line) and a fairly important territorial coverage, assuming that every user would accept to walk on some length to and from the service. Thus, service availability can be optimised, detours are avoided, vehicles achieve higher productivity. The synergy between the ring-shaped infrastructure and the vehicle fleet enables to optimise the quality of service in terms of access time and ride time, and also to reduce production costs - and therefore the tariff fares, under suitable regulation. The chapter aims to reveal these ‘systemic qualities’ of ring-shaped SMSs by providing a mathematical model called ‘Orbicity’. It has a four-fold architecture: (i) traffic operations, (ii) supply-demand equilibrium under elastic demand, (iii) service management with endogenous fleet size and fare rate, (iv) service policy in terms of technology (vehicle type, number of places, energy vector, driving technology) and also the regulation regime. After outlining the model for ring-shaped shuttle services, we explore a set of scenarios along two axes of technological generation and regulation regime. It appears that ring-shaped shuttle services could be supplied at very affordable prices, while achieving profitability and requiring no public subsidies.

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Golden, Eve. „27“. In Jayne Mansfield, 326–43. University Press of Kentucky, 2021. http://dx.doi.org/10.5810/kentucky/9780813180953.003.0027.

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Jayne and Sam tour Asia, and Jayne performs for troops in Vietnam, appearing in Saigon, the Mekong Delta and Da Nang. In the spring of 1967, Jayne and Sam make a nightclub tour of the British Isles, Jayne getting fired halfway through for being late, unprepared and bruised, as rumors of her drinking and Sam's domestic abuse are whispered about. In June 1967, Jayne Marie flees from the Pink palace to a police station, claiming that Sam Brody beat her.

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Ellenberger, Allan R. „“How Many Times Can You Come Back?”“. In Miriam Hopkins. University Press of Kentucky, 2018. http://dx.doi.org/10.5810/kentucky/9780813174310.003.0020.

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Hopkins replaces Jo Van Fleet in the Broadway play, Look Homeward, Angel. Her costar, Andrew Prine, shares his experiences in the play. After it closes, she tours with it for several months. Next, she is signed for the lead in Ma Barker’s Brood, a cheaply made independent film, but her rare unprofessionalism gets her fired. Then, William Wyler hires her for his next film, The Children’s Hour, the original play that was the basis for their 1936 film These Three. Actress Veronica Cartwright, who played Rosalie, shares her remembrances. When Hopkins’s mother dies at age eighty-four, she is overcome by anguish and cannot go to the funeral. Months later, producer Stanley Raiff hires Hopkins for his off-Broadway play Riverside Drive. Raiff describes the turbulent time he has with Hopkins, leading to her firing for not being prepared—or was she? Hopkins portrays a whorehouse madam in Fanny Hill and returns to Los Angeles to play Robert Redford’s mother in The Chase.

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Konferenzberichte zum Thema "Fixed fleet"

Takan, Melis Alpaslan, und Refail Kasimbeyli. „Hybrid Algorithm for Solving the Heterogeneous Fixed Fleet Vehicle Routing Problem“. In 2019 3rd International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT). IEEE, 2019. http://dx.doi.org/10.1109/ismsit.2019.8932935.

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MAŠEK, Jiří, und Václav CÍSAŘ. „EVALUATION OF COMBINE HARVESTERS FLEET MANAGEMENT“. In RURAL DEVELOPMENT. Aleksandras Stulginskis University, 2018. http://dx.doi.org/10.15544/rd.2017.149.

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Combine harvesters play a crucial role in grain harvest. Due to seasonal character of work of these machines is necessary to achieve high standard in durability and reliability during working period. There is lots of requirements that have to be done according to the crop type, field conditions and as well as high performance and lower costs. Combine harvesters are the main harvesting technology of cereals in the world and main piece of work should be done in short time. The aim of this paper is an economic analysis of combine harvester’s fleet in different working conditions. The evaluation is based on exact costs analysis of combine harvesters New Holland brand sort by different ages and different concepts of threshing. Used data were collected during all working seasons of combines. There is a data set from 10 seasons. There is two groups in evaluation - 9 machines NH CR 9080 and another 9 machines NH CX 8080. Working parameters evaluated are fuel consumption and operational costs. Thanks to on board computer we have data about performance of each machine per day and per whole season. Costs are calculated as fixed and variable and then summarized for every machine. The result shows that effect of costs analysis depends on annual performance of the machine. There is positive effect on depressing fixed cost due to higher performance in season. A special result of this study is evidence of intervenes reason during all seasons and setting up the coefficient of repairs for the group of combines.

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Kewei Zheng, Zhiqiang Lu und Xiaoming Sun. „An effective parallel improving tabu search algorithm for Heterogeneous Fixed Fleet Vehicle Routing Problem“. In 2nd International Conference on Computer and Automation Engineering (ICCAE 2010). IEEE, 2010. http://dx.doi.org/10.1109/iccae.2010.5452005.

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Aiello, Giuseppe, Kimon P. Valavanis und Alessandro Rizzo. „3D Real-Time Energy Efficient Path Planning for a Fleet of Fixed-Wing UAVs“. In 2021 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE, 2021. http://dx.doi.org/10.1109/icuas51884.2021.9476769.

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Wu, Yan, Wang Yang, Guochao He und Shennan Zhao. „An improved adaptive large neighborhood search algorithm for the heterogeneous fixed fleet vehicle routing problem“. In 2017 8th IEEE International Conference on Software Engineering and Service Science (ICSESS). IEEE, 2017. http://dx.doi.org/10.1109/icsess.2017.8343000.

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Davison, I. „Modelling Fleet Performance over Complex Operating Scenarios“. In Marine Electrical and Control Systems Safety Conference. IMarEST, 2019. http://dx.doi.org/10.24868/issn.2515-8198.2019.004.

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The Systems Availability Model (SAM) is a program designed to assess the Availability, Reliability and Maintainability (ARandM) characteristics of multiple systems used over operating scenarios that place varying demands upon those systems, such as that encountered in complex military, commercial shipping, industrial installations and deployed systems of systems. The unique ability of SAM to overlay system dependencies onto complex mission profiles makes it a uniquely powerful and flexible ARandM modelling tool. Mission profiles are built up from a variety of activities, each demanding use of different combinations of equipment, rather than a fixed time at risk approach adopted by many simpler modelling tools. This paper and associated presentation discusses: • The unique capabilities of SAM and, at a high level, how a SAM model is developed and its crossindustry applications; • The use of SAM to set system/equipment requirements, and understand the impact of equipment reliability on a fleet of ships undergoing complex operating scenarios; • Reflecting changes to mission requirements, and the knock-on effect of predicted performance; • How SAM can be used to understand the significance of individual systems during safety critical activities (e.g. replenishment at sea, close water navigation).

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Abreu, Robert Cristian, und Jose Elias C. Arroyo. „An application of ILS heuristic to Periodic Vehicle Routing Problem with heterogeneous fleet and fixed costs“. In 2015 XLI Latin American Computing Conference (CLEI). IEEE, 2015. http://dx.doi.org/10.1109/clei.2015.7359988.

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Frommer, Joshua, und William Crossley. „Building Surrogate Models for Capability-Based Evaluation: Comparing Morphing and Fixed Geometry Aircraft in a Fleet Context“. In 6th AIAA Aviation Technology, Integration and Operations Conference (ATIO). Reston, Virigina: American Institute of Aeronautics and Astronautics, 2006. http://dx.doi.org/10.2514/6.2006-7700.

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Erikstad, Stein Ove, und Sören Ehlers. „Simulation-Based Analysis of Arctic LNG Transport Capacity, Cost and System Integrity“. In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-24043.

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This paper presents a design case for arctic LNG transport, where liquefied gas is shipped from the Kharasevey terminal in Northern Russia to markets in US and Europe. Based on a fleet simulation model, the trade-off between the two main performance issues related to arctic transport are investigated; namely how to maintain transport system integrity in the harsh ice conditions, while maximizing the capacity utilization in a situation with considerable seasonal variations. The fixed contract, single destination base case shows that meeting the requirements for a robust solution implies a low degree of utilization in the summer season. To improve upon this situation, several mitigating strategies are evaluated, including vessel speed and size changes, fixed and seasonally varying contract and market mix schedules, revision stop rescheduling, storage capacity extensions and backhauling. The results indicate a high payoff from renegotiating the initial fixed schedule contract to allow for a higher degree of seasonal variations in the LNG deliveries. Further, increased storage capacity in loading port, combined with winter revision stops will have a significant impact on both fleet utilization and total system integrity. Flexible contracts that implies seasonal deliveries to the UK will help ensure continuous production and deliveries in winter season. Finally, surplus capacity gives opportunities for seasonal spot cargoes that could be exploited to increase fleet utilization rate.

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Kwansang, Thanakrit, und Pornpimol Chaiwuttisak. „Applying an Improved Ant Colony Optimization to solve the Homogeneous Fixed Fleet Close Open Mixed Vehicle Routing Problem“. In 2021 7th International Conference on Engineering, Applied Sciences and Technology (ICEAST). IEEE, 2021. http://dx.doi.org/10.1109/iceast52143.2021.9426293.

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Berichte der Organisationen zum Thema "Fixed fleet"

Rodier, Caroline, Andrea Broaddus, Miguel Jaller, Jeffery Song, Joschka Bischoff und Yunwan Zhang. Cost-Benefit Analysis of Novel Access Modes: A Case Study in the San Francisco Bay Area. Mineta Transportation Institute, November 2020. http://dx.doi.org/10.31979/mti.2020.1816.

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The first-mile, last-mile problem is a significant deterrent for potential transit riders, especially in suburban neighborhoods with low density. Transit agencies have typically sought to solve this problem by adding parking spaces near transit stations and adding stops to connect riders to fixed-route transit. However, these measures are often only short-term solutions. In the last few years, transit agencies have tested whether new mobility services, such as ridehailing, ridesharing, and microtransit, can offer fast, reliable connections to and from transit stations. However, there is limited research that evaluates the potential impacts of these projects. Concurrently, there is growing interest in the future of automated vehicles (AVs) and the potential of AVs to solve this first-mile problem by reducing the cost of providing these new mobility services to promote access to transit. This paper expands upon existing research to model the simulate the travel and revenue impacts of a fleet of automated vehicles that provide transit access services in the San Francisco Bay Area offered over a range of fares. The model simulates a fleet of AVs for first-mile transit access at different price points for three different service models (door-to-door ridehailing and ridesharing and meeting point ridesharing services). These service models include home-based drop-off and pick-up for single passenger service (e.g., Uber and Lyft), home-based drop-off and pick-up for multi-passenger service (e.g., microtransit), and meeting point multi-passenger service (e.g., Via).

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