Дисертації з теми "Transport Resource Allocation"
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Kontothanasis, Epameinondas. "Dynamic Optical Resource Allocation in Transport Networks Based on Mobile Traffic Patterns." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-207139.
Повний текст джерелаMobiltrafik ökar snabbt. Baserat på Ericssons prognos [1], väntas mobiltrafiken få en årlig tillväxttakt på 45% i samband med att antalet smartphone-abonnemang och förbrukning per abonnent ökar. Den månatliga volymen av datatrafik väntas att öka sexfaldigt mellan 2015 och 2021. Allteftersom efterfrågan ökar, undersöks och distribueras ny teknik för att möta användarnas krav. Intensivt forskningsarbetearbete bedrivs inför av femte generationens (5G) nätverk. Högt ställda krav på prestanda och kapacitet är de drivande faktorerna i forskningen av heterogena nätverk. Med heterogena nätverk menas nätverk som består av olika teknologier och arkitekturer. Ett heterogent trådlöst nätverk involverar kombinationen av makrooch mimkroceller för att förbättra täckning och kapacitet. All trafik som genereras i mobila nätverk ska överföras från antennen, genom ett accessnät, till huvudkontoret, och därifrån till backbone-nätverket. Optiska nätverk betraktas som den idealiska lösningen för detta ändamål, och forskare driver teknologin mot användning av optiska nätverk i Fixed Mobile Convergence(FMC) arkitekturer. FMC arktekturer är föreslagna arkitekturerna som fokuserar på att konvergera fasta, mobila och aggregerings-nätverk till ett enda transportnät. I denna studie, analyserar vi FMC-arkitekturen. Vi analyserar särskilt Fronthaul-arkitekturen i kombination med transportteknologier, så som Next Generation Passive Optical Network 2 (NG-PON2) och Wavelength Routed Wavelength Division Multiplexing PON (WR-WDM-PON). Vi tar också hänsyn till trafikmönster i mobila nätverk i olika sorters urbana områden i Stockholm. Baserat på trafikmönstret räknas antalet små celler som behövs per område ut. I detta examensarbete är det trafikmönster från mobila nätverk och transportnätverksarkitekturer som studeras. Syftet med denna avhandling är att skapa en algoritm, och studera olika olika scenarion där den underliggande transportinfrastrukturens resurser delas. Resultatet av denna algoritm avslöjar om delning och återanvändning av resurser i transportnätverket är fördelaktigt när det gäller att spara resurser.
Pederzolli, Federico. "Resource allocation and modeling in spectrally and spatially flexible optical transport networks." Doctoral thesis, Università degli studi di Trento, 2018. https://hdl.handle.net/11572/367953.
Повний текст джерелаPederzolli, Federico. "Resource allocation and modeling in spectrally and spatially flexible optical transport networks." Doctoral thesis, University of Trento, 2018. http://eprints-phd.biblio.unitn.it/3000/1/main.pdf.
Повний текст джерелаKhan, Mohammad Irfan. "Multi-Service Resource Orchestration for Vehicular Safety Communications." Electronic Thesis or Diss., Sorbonne université, 2019. http://www.theses.fr/2019SORUS639.
Повний текст джерелаWireless channel congestion control and decentralized resource allocation for 802.11p based V2X communication have been widely investigated for a single Cooperative Awareness service, considering mostly homogenous communication requirement per vehicle. Future connected vehicles will be based on multiple V2X services, with heterogenous number of services and communication needs, which existing resource allocation mechanisms does not address. In this thesis, we analyze several decentralized congestion control and channel resource allocation protocols standardized in Europe for initial V2X deployment. We present issues with the existing approach, in particular the inefficient channel capacity utilization, problematic cross layer coordination, inability to balance resources among multiple V2X safety services and distributed resource allocation for asymmetric number of services per vehicle. We propose improvements to the shortcomings, considering the requirements of future V2X scenarios. We demonstrate the limitations of classifying V2X services using static priority for Quality of Service and propose dynamic prioritization. We design a resource orchestrator at the Service Layer to improve cross layer coordination and dynamically distribute the limited channel resource among multiple services of a vehicle. Furthermore, we present a mechanism to decentrally orchestrate channel resource among a mixed distribution of vehicles with diverse channel usage requirements under channel congestion. Analytical and simulation-based results show the validity of our proposed approach, and the V2X application performance improvement it renders, compared to existing standardized protocols
Hatzenbühler, Jonas. "Transition Towards Fixed-Line Autonomous Bus Transportation Systems." Licentiate thesis, KTH, Transportplanering, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-272008.
Повний текст джерелаDe senaste årens framsteg inom autonom körteknik har lett till mer mogna autonoma fordon. Dessa fordon har setts tillämpas i flera pilotprojekt över hela världen, oftast i form av små bussar. Samtidigt växer mängden människor som reser, särskilt i stadsområden, kontinuerligt vilket resulterar i fler resor i transportsystemet. Därför krävs ett effektivt transportsystem för att tillgodose det växande antalet passagerare. Autonoma bussar (AB) antas ha lägre driftskostnader och därmed kan system för kollektivtrafik (public transport, PT) potentiellt utformas mer effektivt för att underlätta den ökade efterfrågan bättre. I denna studie föreslås ett AB-specifikt simuleringsbaserat optimeringsramverk som gör det möjligt att analysera effekterna AB har på linjebaserade PT-system. Avhandlingen fokuserar på övergången från befintliga PT-system till linjebaserade PT-system som delvis eller uteslutande drivs av AB. Befintligt arbete med PT-tjänstdesign utvidgas så att realistiska AB-system kan undersökas. Detta uppnås genom att (i) använda AB-specifika operatörskostnadsformuleringar, (ii) integrera infrastrukturkostnader som krävs för AB-verksamhet, (iii) använda en dynamisk, stokastisk och schemabaserad modell för att tilldela passagerare vid simulering av PT-nät samt genom att (iv) formulera ett multifunktionellt optimeringsproblem som gör det möjligt att undersöka AB: s intressespecifika effekter. I artikel I undersöks effekterna av AB, med avseende på servicefrekvens och fordonskapacitet, på fasta linjer i PT-nät. Förändringar utvärderas bland annat utifrån skillnader i servicenivå och passagerarflöde. Dessutom studeras den sekventiella introduktionen av AB i befintliga PT-system. Det föreslagna ramverket tillämpas på en fallstudie i Kista, Sverige. Studien bekräftade den initiala hypotesen att utplaceringen av AB leder till en ökning av servicefrekvensen och en marginell minskning av fordonens kapacitet. Vidare kunde man se att utplaceringen av AB ökar passagerarbelastningen på AB-linjer och att passagerare kan skifta från andra PT-former mot AB-tjänsterna. Artikel II integrerar en multifunktionell heuristisk optimeringsalgoritm i ramverket för simuleringen. Studien undersöker förändringar i transportnätverkets design baserat på implementeringen av AB. Skillnaderna i användarfokuserad och operatörsfokuserad nätverksdesign analyseras och AB: s inverkan på dessa kvantifieras. Denna studie tillämpas på en fallstudie i Barkarby, Sverige, där ett fullstort linjebaserat PT-nät är utformat för att exklusivt driva AB. Vi visar bland annat att den autonoma tekniken reducerar antalet använda busshållplatser och reducerar den totala PT-nätstorleken. Dessutom kan implementeringen av AB på användarfokuserade PT-nät ytterligare förbättra servicenivån främst genom att minska den genomsnittliga väntetiden per passagerare.
Brulard, Nicolas. "Outils d'aide à la conception de systèmes de production maraîchers urbains optimisés pour la vente en circuits courts et de proximité." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAI002.
Повний текст джерелаTo support the urban farm emergence trend in large metropolises, we propose decision support tools based on mathematical programs to design market gardening farms targetting the demands of different categories of clients in local fresh fruits and vegetables. Technical solutions develop rapdily, but the strong constraints linked to urban farming, such as limited surface and high operating costs, make difficult to define viable and sustainable business models for urban market gardeners. Three mixed integer linear programming models are presented: An annual strategic sizing model, a client combination selection model and a plurennial strategic sizing model for diversified fruit and vegetable farms. Numerical results and model performances are presented, based on multi-products, multi-techniques and multi-periods real cases. Our main contributions are the consideration of the perishable nature of fruits and vegetables in strategic production systems sizing models, including notably the investments and workforce sizing
Jackson, Joshua J. "OPTIMAL USES OF BIOMASS RESOURCES IN DISTRIBUTED APPLICATIONS." UKnowledge, 2015. http://uknowledge.uky.edu/bae_etds/34.
Повний текст джерелаLeckström, Kristin. "Maximising defence capacities by allocating societal resources : Balancing the objectives in planning for a total defence structure." Thesis, Försvarshögskolan, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:fhs:diva-9433.
Повний текст джерелаCazenave, Paul. "Synthèse de contrôleurs pour des classes de réseau de Petri à contrôlabilité et observabilité partielles : application au contrôle automatisé des trains." Thesis, Centrale Lille Institut, 2020. http://www.theses.fr/2020CLIL0012.
Повний текст джерелаCollisions and deadlocks are unwanted situations in many transport applications such as railway systems. Control synthesis methods can assure that a closed-loop system cannot lead to deadlock situations. Methods issued from the historical approach of Ramadge and Wonham allow dealing with this issue but encounter the problem of combinatorial explosion, that prevents its use on large systems. In the case of deadlock avoidance, the majority of approaches are based on the assumption of total controllability and observability. However, this assumption is not verified in all kinds of systems. This thesis proposes control synthesis methods that do not suffer from the combinatorial explosion. These methods are based on the formalism of Petri nets and uniquely concern classes of resource allocation systems. In a way to not resort to state exploration, these methods identify deadlock situations by resolving a mixed integer programming problem. These methods are then used for routing trains in a railway node. A systematic modeling approach of the trains' circulations in a railway node is developed. The model obtained is a Petri net for resources allocation system. To avoid collisions and deadlocks in the model, a control synthesis method, based on the theoretical background developed, is proposed
Cazenave, Paul. "Synthèse de contrôleurs pour des classes de réseau de Petri à contrôlabilité et observabilité partielles : application au contrôle automatisé des trains." Thesis, Ecole centrale de Lille, 2020. http://www.theses.fr/2020ECLI0012.
Повний текст джерелаCollisions and deadlocks are unwanted situations in many transport applications such as railway systems. Control synthesis methods can assure that a closed-loop system cannot lead to deadlock situations. Methods issued from the historical approach of Ramadge and Wonham allow dealing with this issue but encounter the problem of combinatorial explosion, that prevents its use on large systems. In the case of deadlock avoidance, the majority of approaches are based on the assumption of total controllability and observability. However, this assumption is not verified in all kinds of systems. This thesis proposes control synthesis methods that do not suffer from the combinatorial explosion. These methods are based on the formalism of Petri nets and uniquely concern classes of resource allocation systems. In a way to not resort to state exploration, these methods identify deadlock situations by resolving a mixed integer programming problem. These methods are then used for routing trains in a railway node. A systematic modeling approach of the trains' circulations in a railway node is developed. The model obtained is a Petri net for resources allocation system. To avoid collisions and deadlocks in the model, a control synthesis method, based on the theoretical background developed, is proposed
Bizotto, Ana Paula. "Métodos de gestão para a alocação dos custos de transporte: um estudo de caso para a coleta de leite." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/11/11132/tde-03122007-100215/.
Повний текст джерелаThis dissertation had the objective to study methods of transport cost allocation on milk collection in order to deepening and debating about several ways usually used and new ways to proceed the allocation, such as Activity Based Costing methodology. Methodologies traditionally used consider volume or distance to allocate costs to farmers generating distortions that penalize some farmers and benefit others in many cases. This has happened because traditional methodologies do not require knowledge about logistic process of milk collection to be applied. However, the Activity Based Costing methodology contributes to cost allocation process by taking into account variables as volume, distance and time. In addiction, the ABC methodology has managerial function by demanding a well-known logistic process allowing, in this way, to identify the most costly activities. The comparison between traditional methodologies and ABC methodology took place through a case study applied to Cooperativa dos Produtores Agropecuários de São Pedro COOPAMSP, that had 46 farmers producing milk in three routes (L1, L2 and L3), in the period of time that was considered. The results obtained by comparison between cooperative's methodology, that allocates costs in direct proportion to volume, and ABC methodology are emphasized. The methodology used by the cooperative allocates the highest costs to the more efficient route (L1) in aid of less efficient farmers (L2 and L3). That distortion does not happen when ABC methodology is used.
Lima, Matheus Garibalde Soares de. "Alocação de recursos em nível operacional com incerteza nos dados." Universidade Tecnológica Federal do Paraná, 2012. http://repositorio.utfpr.edu.br/jspui/handle/1/1298.
Повний текст джерелаThe study aims to address the allocation of resources at the operational level under uncertainties. For this reason, it was proposed an optimization approach based on heuristic methods. The resolutions of production and logistics problems, commonly addressed in operational research, explore various parameters among which the present study considers three variables of uncertainty: demand, operation time and resources availability. For this purpose a logistics problem was chosen as study of case. The problem consists in minimizing cost operation, selection of vehicles in a heterogeneous fleet, consolidation of loads for each client and selecting the type of freight payables. Regarding of freight payables types, there are centered in two different tariffs, mainly due to assets and service negotiation, such as: i) fleet controlled by company and service outsource; ii) fleet and service completely outsource. The resolution of the original problem was broke down in two steps: i) Compartmentalizer and ii) Allocator. Both steps are solved through Tabu Search approach; the first step (Compartmentalizer) generates a list of feasible shipments to fulfill orders up to three different customers. The second step, the allocator uses the list of feasible shipments to define how and when each request will be supplied. The results aim the feasibility of assumes this approach in order to solve real problems.
Ahmad, Abdel Mehsen. "Techniques de transmission et d'accès sans fil dans les réseaux ad-hoc véhiculaires (VANETS)." Phd thesis, Institut National des Télécommunications, 2012. http://tel.archives-ouvertes.fr/tel-00762633.
Повний текст джерелаHsieh, Cheng-Hsien, and 謝承憲. "A Resource Allocation Model towards Urban Sustainability based on Transport Diversity Perspective." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/02406904339832926991.
Повний текст джерела國立交通大學
交通運輸研究所
97
Different transport stakeholders have different needs for transport infrastructure and services. Meeting the needs of stakeholders implies a trade-off of benefits and costs between supply and demand and creates issues of transport diversity. However, the literature has largely ignored these issues. This study aims to provide a framework evaluating transport diversity to promote quality of life. Transport diversity is defined as the satisfied level of stakeholder needs in this study and measured as the gap between expected goal and present values of stakeholder needs in the form of the Shannon-Weaver Index, or namely the Entropy. Transport diversity can assess whether the level to which important needs are satisfied equitably, and monitor whether the transportation system is moving towards sustainability via confirming the targets and the basic level of quality of life. The proposed framework suggests that the evaluation of transport diversity should consider distinct transportation needs, such as mobility, economic health, reliability, safety, accessibility, affordability, level of universal design, externality and resource over-utilization, of different stakeholder including various modal users, specific users and non-users simultaneously. Accordingly, transport diversity is thus the necessary condition for quality of life and sustainability. Improving the sustainability and quality of life with regard to transportation requires the support of transport diversity. This study hopes that the conceptual framework developed can assist decision-makers in understanding the relationship between transport diversity and sustainability, and provide a new assessing method for improvements in quality of life. After identifying the appropriate indicators referring to stakeholder needs, a preliminary spatiotemporal analysis is illustrated through an empirical study to discuss the managerial implications in the Taipei metropolitan area. The results reveal that transport diversity is improved from 2000 to 2005. In fact, the transportation system has progressed in the satisfactions of safety and reliability. However, the achievements of emission, accessibility and level of universal design perform poorly. Decision-makers could understand better resource allocation policies according to the analytical results. In particular, deficient quality of life for disable users should be improved effectively and efficiently. Additionally, resource allocation policies help planners decide when and how to invest transportation infrastructure and services. However, policies for improving transport diversity are difficult to design, implement, and quantify because of the uncertainty, feedback interaction, and complexity of system relationships. This study proposes a hybrid model integrating system dynamics, cognitive maps, and sensitivity model to tackle the problems. Notably, the result of sensitivity model reveals that the increment of private vehicle trips reduces transport diversity due to the increase of energy consumption, emission and accident rate. However, tuning policy delays does not significantly impact system performance through managerial choices of resource allocation. Moreover, the simulation results indicate that the gaps in stakeholder needs are generally opposite to transport diversity and positive proportion to private vehicle trips. This verifies that increasing public transit trips helps the system bridge the gap between user satisfactions of stakeholder needs. According to the system relationships constructed by the hybrid systematic simulation tool, fuzzy multi-objectives programming, a Pareto based mathematical approach is employed to solve the non-linear multi-objectives problems focusing on urban public transit systems for determine the impact of resource allocation on need satisfactions related to stakeholder behaviors. The proposed approach evades inefficient and inequitable resource allocation. Furthermore, analytical outcomes show that recent investments allocated to public transit system considered equitable stakeholder satisfactions both of MRT and bus, as well as promoted transport diversity in the Taipei metropolitan area.
Chavhan, Suresh. "A Method of Designing an Intelligent Public Transportation System in Metropolitan Area Using Emergent Intelligence." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/5008.
Повний текст джерела