Tesis sobre el tema "Total production cost optimisation"
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Abubakar, Aminu Sahabi. "Contribution to the development of new maintenance strategies integrated to control charts for a production process under service levels, operational, and quality constraints". Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0055.
Texto completoThe current production industry is characterise by significant progress: a massive increase in high technology, the emergence of exigent customers, competitive markets, varied product quality, and random demands required the collaborations of the inter-related aspects of production. The production, maintenance, and quality are the most critical aspects of the industrial system. We are interested in optimising maintenance that plays a critical role in customer satisfaction, sustainability, and the development of companies. Our study is centred on developing production and maintenance integrated into a control chart of quality policy. We propose new integrated maintenance strategies with an in-depth analysis of the continuous production process reliability improvements and treated under customer requirements (Service, quality, and cost) constraints. The integration and optimal coordination of these factors of production is not easy and represent a challenge for industrial companies, and are more challenging with multi-assignable causes of production process variation. To address this problem, this research work employed the use of a control chart tool in combination with the AFNOR principles known as Rule of seven as involved in quality management. To monitor, analyses and direct appropriate maintenance actions for continuous system reliability improvements along the different multiple process scenarios as decision levels. We use the interactions between the production process and product quality for strategies of maintenance which reduce the failure of the production system by improving process reliability and reducing the no conformal products. The study Significantly focused on quality, quality tools, and their applications in production and maintenance control. The technique we used to optimise the maintenance and quality control of an integrated production system is a control chart tool based on statistical measurement and analysis of quality parameters. We model different production problems and develop a control policy for randomly failing production systems that must satisfy customer requirements dynamically throughout the finite production horizon. We introduced a mathematical model to minimise the total costs of production, inventory, maintenance, and quality control. The optimisation of the maintenance strategy was integrated into a control chart tool information. Based on the production rate variation and its impact on machine degradation the number of maintenance, times, and intervals needed for prudent decision-making is determined by the developed algorithm. In this context, this research presents the derivation for different cases of all the probabilities for the process to be in or out of control, the average run lengths, and the restoration cycle durations. Based on the degradation factor, new failure rate equations are formulated, and then the average failure rate for each case, we formulated different maintenance cost optimisation models. The proposed approach is useful for precise calculation and minimisation of the total maintenance cost. Which optimises total production cost considering all possible production process statuses due to multiple causes. Our work contributes to the emergence of quality management and performance improvement techniques that will contribute to the development of production companies
Tan, Jun Liang. "Development of a pitch based wake optimisation control strategy to improve total farm power production". Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-304705.
Texto completoPellegrini, Jacob Philip. "Reduction of total production cost through the use of safety stock and process improvements". Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/122569.
Texto completoThesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2019, In conjunction with the Leaders for Global Operations Program at MIT
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 76-77).
In an ideal production system, supply exactly meets demand. Instantaneous, correct quantities arrive exactly at the right location when needed. However, real-world production systems often have variability- a change in the quantity demanded, a broken part, a shipping delay for a snow storm. The variability can be random, so companies are left with a dilemma: too little inventory buffer and a shortage may occur; too much inventory and capital is unnecessarily tied up in inventory sitting on the shelves. Using research conducted at the Boeing 737 program as a case study, this thesis proposes the application of a multi-step approach to optimize the total cost of the production system, balancing holding cost (inventory) with the disruption cost of a shortage. The initial pilot shows that small increases in inventory can have an order of magnitude of cost avoidance. The methodology includes system observation, qualitative interviews with Boeing employees, quantitative data gathering and analysis, proposed changes, and measured results. First, the historical supply and demand variability of the system is identified. Second, the cost of a shortage is estimated for the system. Next, an analytical approach to set safety stock levels is applied to balance the cost of inventory held with the cost of a shortage. By reducing the variability in the system, inventory levels can be reduced while maintaining the service levels. This process is then repeated at regular intervals to optimize the total cost of the system, balancing inventory holding cost and the disruption cost of a shortage.
by Jacob Philip Pellegrini.
M.B.A.
S.M.
M.B.A. Massachusetts Institute of Technology, Sloan School of Management
S.M. Massachusetts Institute of Technology, Department of Mechanical Engineering
Liu, Ying. "Multi-objective optimisation methods for minimising total weighted tardiness, electricity consumption and electricity cost in job shops through scheduling". Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/14125/.
Texto completoBerkoune, Djamel. "Optimisation de l'ordonnancement prenant en compte les tâches prévisionnelles". Valenciennes, 2005. http://ged.univ-valenciennes.fr/nuxeo/site/esupversions/447b7d18-7b4f-4074-8bd4-e36c1429ef39.
Texto completoIn this work, we consider the flexible job-shop scheduling problem with uncertain demands and we develop a new cooperative methodology to solve it. It is organized in two main parts. The first one consists in finding a scheduling for the firm demands. The second one consists in developing methods allowing of insertion the predicted demands in the solutions found initially with insertion methods (static method and dynamic method) while optimizing the considered criteria. To test the effectiveness of these solutions, we determine an approach based on the calculation of the lower bounds for the criteria, which calculation on the firm demands and on the estimated ones. A method of resolution for multicriterion problems is proposed to help the decision maker when it cannot give a particular preference to the criteria. Moreover, we validate these methods on a series of example. Finaly, we conclude this memory by listing some advantages of our methods
Ericsson, Nicklas y Tommy Brehmer. "The power of allocation : A case study at a company concerning the differences in total production costs between Sweden and China". Thesis, Jönköping University, JIBS, EMM (Entrepreneurship, Marketing, Management), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-904.
Texto completoBackground: China is one of the most popular countries to relocate and outsource production units to. This country has a big advantage when it comes to the manual working cost which is very low. This difference between Sweden and China is huge; the cost of the manual working force is less than one twentieth of the Swedish.
Problem: Massive global relocation of production units can affect some countries in a negative way. One of the most important foundations in the society is that there is a high level of employment and this also contributes for economic growth. This is in terms of both tax incomes for the public society as well as self-esteem for the people.
Purpose: The purpose with this thesis is to examine the differences in total production costs, including allocation of overhead costs for product development and production in Sweden vs. China at a company, in this thesis referred to as Manufacturer AB.
Method: Case study approach with in-depth interviews, phone calls and e-mail follow up. In total 9 respondents consisting of managers in leading positions at Manufacturer AB in Sweden.
Conclusion: The manufacturing cost in the Chinese production unit is about 40-60 per cent compared to the Swedish unit. In the current situation the overhead allocation is 4 % overhead of MC at the Chinese production unit and 133 % at the Swedish unit. The total production costs are not reflected in a correct way per unit. To do a more true allocation, the overhead costs in the Company Group must be identified and allocated in the right proportions on their respective production unit.
By creating an average- and in next step an estimated allocation model we succeeded to do a more justified allocation of the overhead costs on the production units in Sweden and China. This model should be relative simple to implement on product- or unit level and gives a more correct allocation than the current.
However, it is the decision of Manufacturer AB to allocate their overhead as they like, but the estimated allocation model gives a base for strategic decisions on production unit level, referring to; where to locate the production units to reach competitive advantage.
Bakgrund: Kina är ett av de mest populära länderna att utlokalisera och outsourca produktionsenheter till. Detta land har en stor fördel när det gäller kostnaden för manuellt arbete, som är väldigt låg. Skillnaden mellan Sverige och Kina är enorm; kostnaden för den manuella arbetstiden är ca en tjugondel av den svenska.
Problem: Massiva globala omflyttningar av produktionsanläggningar kan påverka vissa länder negativt. En av de viktiga grundpelarna i samhället är att det finns en hög sysselsättningsgrad som bidrar till ekonomisk tillväxt. Detta gäller såväl skatteintäkter till staten som självkänsla hos folket.
Syfte: Syftet med den här uppsatsen är att undersöka skillnaderna i den totala produktionskostnaden, inkluderat fördelning av overheadkostnader för produktutveckling och produktion i Sverige jämfört med Kina vid ett företag som i denna uppsats refereras till Manufacturer AB.
Metod: Fallstudie är gjord med hjälp av personliga djupintervjuer, uppföljande telefonsamtal och elektronisk post. Totalt deltog 9 respondenter bestående av tjänstemän i ledande positioner på Manufacturer AB i sverige.
Slutsats: Tillverkningskostnaden i den Kinesiska produktionsenheten är ungefär 40-60 procent jämfört med motsvarande enhet i Sverige. I nuläget är overheadpålägget 4% på produktionsenheten i Kina och 133% på enheten i Sverige. Den totala produktionskostnaden speglas inte på ett rättvist sätt per produktionsenhet. För att göra en mer rättvis fördelning så måste koncernens totala overheadkostnad identifieras och mätas och sedan allokeras i de rätta proportionerna på respektive produktionsenhet.
Genom att skapa en genomsnittlig och i nästa steg en uppskattad fördelningsmodell lyckades vi att göra en mer rättvis fördelning av overheadkostnaderna på produktionsenheterna i Sverige och Kina. Denna modell borde vara ganska enkel att implementera på produkt- eller enhetsnivå och ger en mer korrekt fördelning än den nuvarande.
Hursomhelst, är det upp till Manufacturer AB att fördela deras overheadkostnader som de vill, men den ”uppskattade” modellen ger en bas för strategiska beslutsunderlag på produk-tionsenhetsnivå, som svarar på frågor som; var ska man lokalisera produktionsenheter för att nå konkurrensfördelar.
Babin, Anthony. "Optimisation du coût de revient global (TCO) d’un véhicule utilitaire électrique 3,5t ; modélisation multi-physique, dimensionnement et recharge intelligente". Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS356.
Texto completoThe electric vehicle is one of the environmentally friendly transport solutions that emit no pollutant during its use. Gruau, manufacturer-converter for light commercial vehicles (LCV), is actively involved in green transport in the 3.5t segment. In order to increase sales of electric LCV, it is necessary to reduce its total cost of ownership (TCO). The objective of this thesis is to study and model the behavior of the components of this electric vehicle in order to simulate TCO. The main component studied is the battery, whose limited lifetime will determine the profitability of the vehicle. The first part of the work was devoted to modeling the behavior of the vehicle according to a given customer mission. The study of battery cells was done with the aim of building a complete multi-physics model taking into account calendar aging and cycling aging. Then, this battery model is integrated in a complete energy model taking into account all the components of the studied vehicle. Then a global model, including this battery model, makes it possible to determine the energy required for a given path and to simulate the aging of the electrochemical cells in order to calculate the TCO. A second part is oriented towards the calculation of the TCO. The implementation of an optimization algorithm, with a methodology of computing acceleration, allowed to achieve the computations in reasonable times (reduction from 13h to 15min by iteration). After studying the impact of battery sizing on the TCO, it appears that the reduction of the battery capacity does not systematically lead to the reduction of the TCO. There is therefore an optimum TCO point for each mission (up to 17% savings). In order to improve the TCO, smart recharging strategies are developed and allow increasing e-LCV profitability (up to 29%). This work is integrated into a decision support software relative to the battery capacity according to customer needs, intended for commercial sales forces
Åkerberg, Filip y Jakob Flodell. "Future production state at Strömsholmen AB : - A singel case study analyzing the impacts of eliminating a bottleneck with a total cost perspective". Thesis, Linköpings universitet, Logistik- och kvalitetsutveckling, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-176959.
Texto completoOzlen, Melih. "A Bicriteria Rescheduling Problem On Unrelated Parallel Machines: Network Flow And Enumeration Based Approaches". Phd thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607822/index.pdf.
Texto completoHo, Van Long, Ebuh Randy Ewane y Maxime Héaumé. "A CASE STUDY FOR LORAMAX ON SUPPLY CHAIN STRATEGY & PRODUCTION EFFICIENCY". Thesis, Linnéuniversitetet, Ekonomihögskolan, ELNU, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-12304.
Texto completoDjurisic, Stefan y Pawel Glazowski. "Undersökning av kostnadsöverskridande i byggbranschen : Faktorer som påverkar att slutsumman blir högre än den estimerade kostnadskalkylen". Thesis, KTH, Byggteknik och design, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-287205.
Texto completoLännevall, Joel. "Operation dependent costs of non-optimal hydropower production : Effects on the operational pattern of the Small Lule River". Thesis, Uppsala universitet, Elektricitetslära, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-294867.
Texto completoRillaerts, Stéphane. "Organisation économique du secteur hospitalier et optimisation de la production des soins: vers un nouveau mode de gestion de l'hôpital". Doctoral thesis, Universite Libre de Bruxelles, 2003. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211242.
Texto completoElsheikhi, Salah A. "A holistic approach to injection moulding optimisation for product quality and cost through the characterisation of reprocessed polymeric materials and process monitoring : experimental evaluations and statistical analysis of multiple reprocessing of unfilled and short glass fibre filled polypropylene materials : an optimised methodology to realise minimum product cost at an acceptable product quality". Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5405.
Texto completoManning, James. "A reliability model of a power distribution network with reference to petrochemical and gas-to-liquid plants". Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/40819.
Texto completoDissertation (MEng)--University of Pretoria, 2013.
gm2014
Electrical, Electronic and Computer Engineering
unrestricted
Luiz, Rodrigo Marcus Dias Luiz. "Programação de produção levando em conta máquinas em paralelo e set-up dependente da sequência de produção". Universidade Tecnológica Federal do Paraná, 2012. http://repositorio.utfpr.edu.br/jspui/handle/1/566.
Texto completoDue to economic growth, companies in general – but particularly manufacturing industries - end up looking for a way to eliminate losses that are evident and others that are not so easy to identify so as to maximize profits. This project seeks for an optimal production schedule to increase the availability of a device responsible for manufacturing more than one product. With increased demands from customers, industry is compelled to vary its production mix so that it can not have equipment dedicated to each produced model type. Thus, the use of operational research approaches is more and more required to be able to set up a production schedule in a faster and assertive way. One can not stop considering the influence of equipment availability for a smoother production scheduling. Aligned with this, when evaluating the major losses at the equipment, there is a need to reduce the set-up time. To make this possible, it is suggested the implementation of the SMED methodology, which was created within Lean Manufacturing - more specifically, by TPM system. From the perspective of optimization, the proposed problem is challenging since there are multiple identical parallel processors with sequence dependent set-ups. Thus, it is up to the proposed system to define how much of the total demand for each product will be produced in each of the processors in order to minimize the total set-up time. In other words, production lots have no fixed size. It was proposed a hybrid approach using dispatch rules (heuristics) for the solution of the proposed problem that have presented satisfactory results.
Mertz, Théophile. "Optimisation simultanée de la configuration et du dimensionnement des réseaux de chaleur urbains". Thesis, Pau, 2016. http://www.theses.fr/2016PAUU3019/document.
Texto completoThe aim of this thesis is to develop a method that provides design assistance for District Heating Network (DHN). This tool allows simultaneously the optimization of the configuration and its sizing, thanks to an MINLP formulation (Mixed Integer Non-Linear Programming). Binary variables help to choose the optimal configuration (network layout and technologies of production), whereas continuous variables help DHN sizing (temperature, diameter, velocity, heat exchanger area, thermal generating capacity …). The objective function to minimize is the total cost (capex and opex), subjected to numerous nonlinear constraints (e.g. thermal losses, pressure drop, energy balance).This method enables to design temperature cascade between consumers, when consumer temperature requirements are different, and also looped network (only one pipe in one trench). It helps also the decision to connect (or not) consumers to the main network and also the location(s) and type(s) of the heating plant. Moreover, the arbitrage between heat losses and pressure drops is taken into account thanks to physical considerations (non-linear equations). Eventually, it is possible to design 4th generation DHN and prove their financial profitability over the long terms (30 years). First a multi-step resolution strategy is proposed to ensure finding global optimum of the complex MINLP problem. Then academic study cases are analyzed to underline the numerous assets of the formulation. Finally, the optimal design compared to an existing DHN ensures the consistency of the method and allows to build a study case at a wider scale, which can be solved thanks to the comprehensive strategy developed. The design assistance method is available for initial design as well as for extension of existing DHN
Mazloum, Youssef. "Modélisation dynamique et optimisation des systèmes de stockage d'énergie par air comprimé fonctionnant à pression fixe". Thesis, Paris Sciences et Lettres (ComUE), 2016. http://www.theses.fr/2016PSLEM076.
Texto completoThe contribution of the renewable energy sources in the electricity generation mix is greatly increasing. Thereby, the integration of the energy storage technologies into the electrical grid is becoming crucial to reduce the drawbacks of the renewable energy sources. Then, the objective of this thesis is to evaluate the cost-effectiveness, to optimize and to study the transient behavior of a novel isobaric adiabatic compressed air energy storage (IA-CAES) system. This plant is characterized by the recovery of the compression heat and the storage of the compressed air under fixed pressure in hydro-pneumatic tanks. These allow improving the efficiency and the energy density of the storage system and avoiding the use of fossil fuel sources.Firstly, a steady state model is developed to perform energy and exergy analyses of the IA-CAES system. An exergoeconomic model is also carried out in order to optimize the cost-effectiveness of the storage system by using a genetic algorithm. So, an objective function, which includes the investment cost and the operating cost, is defined to be minimized. The system efficiency is 55.1% in the base case, it is improved to 56.6% after optimization with a decrease in the capital investment by 5.6%.Secondly, a dynamic model is developed to study the flexibility of the storage system and its ability to meet the electrical grid requirements (primary and secondary reserves) by evaluating the duration of the transient states. The results show that the storage system needs more than 2 min before being able to consume all the excess energy available on the electrical grid and more than 5 min before being able to produce all the energy required by the electrical grid. Suggestions are analyzed to improve the flexibility of the storage system such as the operation of the storage system in standby mode with low speeds. It allows reducing the energy losses by 68% during the storage mode and by 27% during the production mode compared to the standby mode in nominal speeds
Andersson, Felicia y Amanda Folke. "Utveckling av metoden kunddrivet inköp : Inkludering av egentillverkade artiklar". Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Industriell organisation och produktion, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-31005.
Texto completoPurpose – The purpose of the study was to develop the CDP-method to include also manufacturing items. In order to help answering the purpose, three questions have been defined: Which data and analytical tools in the CDP-method affect manufactured items? Which tools should be added in the second phase in order to analyse manufactured items? Which additional data should be included in the first phase in order to include manufactured items? Method – The procedure for the study contain a literature study, case study and an analytical conceptual approach. In order to answer the first question, a case study was performed with interviews, observations and document studies at Kinnarps, Skillingaryd. The received data were interpret and analysed in relation to the theoretical framework that generated a result. In order to answer the second and third question, an analytical conceptual approach were conducted from previous theories that later was compiled in a model. Findings – Step one to four in the first phase and step seven and eight in the second phase of the CDP-method affect manufactured items. A model for included manufactured items has been created where analytical tools and data are presented that should be investigated. The tools that are introduced are based on theories within value stream mapping, material handling and a model for make-or-buy-decision. Based on these tools, it could be interpreted which data that should be created for manufactured items. Implications – It appears in this study that no new literature has been created but combinations of already existed theories are presented. The theory within the CDP- method could be changed from results that were founded when the CDP-method was applied at the case company. This is presented in the bachelor thesis seventh chapter. Companies that apply the CDM-method could increase the knowledge for customer driven manufacturing and improve the company internally. The method also assists when analysing both external and internal flows. Limitations – Today the CDP-method is relative new and not applied outside the context that it is designed for. One result of this is that the authors have not confirmed these literatures by other researcher. The focus has been to find theories to customer driven manufacturing within value stream mapping material handling and so on. It would have been desirable if additional literature studies could be performed in order to find appropriate development areas. Keywords – CDP-method, material handling, SWOT-analysis, supply chain, make- or-buy analysis, value stream mapping, production layout, total cost of ownership.
Ochoa, Robles Jesus. "Multi-objective optimization strategies for design and deployment of hydrogen supply chains". Thesis, Toulouse, INPT, 2018. http://www.theses.fr/2018INPT0062/document.
Texto completoHydrogen is one of the most promising energy carriers in the quest for a more sustainable energy mix. Several studies and roadmaps have been carried out about the potential of a « hydrogen » economy and have identified that even if many of the required technologies are already available today, the deployment of hydrogen infrastructures constitutes the most challenging task for its development, so as to achieve competitive costs and mass market acceptance. The design of a hydrogen supply chain (HSC), in particular for mobility purpose, involves a series of important decisions at different levels, i.e. energy sources, production, transportation and storage and can be viewed as a multi-echelon, multi-objective and multi-period problem with multiple stakeholders. The objective of this work is to propose a methodological framework to tackle the HSC design problem in a complementary manner to the work proposed in the PhD work of (Sofia de Leon Almaraz, 2014) in which a multi-objective formulation was implemented via the -constraint method to generate the Pareto front, optimising three objectives at the same time, total daily cost, global warming potential and a safety risk index. A sensitivity analysis based on a design of experiments through the Factorial Design and Response Surface methods was carried to identify the major parameters (factors) and their interaction affecting the economic criterion, i.e., the total daily cost (TDC) (response), encompassing capital and operational expenditures. This sensitivity analysis highlights that the demand is by far the most significant parameter that strongly conditions the TDC criterion so that more effort is needed to model demand uncertainty consistently in HSC design, especially since a long horizon time is considered for hydrogen deployment. Besides, in the initial formulation of HSC design, the size of the problem related to the number of binary variables often leads to difficulties for problem solution. In this work, the potential of genetic algorithms (GA) via a variant of NSGA-II is explored to cope with the multi-objective formulation, in order to automatically produce the Pareto front. The model formulation has then been extended to take into account demand uncertainty, giving more robustness to the proposed approach. Two case studies support the analysis: first at regional level, the results of a HSC design for the former Midi-Pyrénées region obtained with both models are compared. The solutions obtained by GA exhibit the same order of magnitude as those obtained with MILP (Mixed Integer Linear Programming) in the mono-criterion problem, but better compromise solutions are produced in the multi-objective formulation and more flexible ones are obtained with demand uncertainty modelling. Then an airport ecosystem, i.e. Tarbes-Lourdes has been studied: the airport infrastructure is an interesting case study, since an airport is a source of emissions that affect climate, including the emissions generated from activities occurring inside and outside the airport perimeter fence associated with the operation and use of an airport. Finally, a post-optimal analysis on a compromise solution of HSC configuration is carried out based via two cost-benefit analyses (CBA) from a social (SCBA) and governmental perspective (subsidies and taxes). The SCBA approach for hydrogen deployment integrates societal benefits for the reduction of greenhouse gas emissions, noise air pollution abatement and social costs for the increase in platinum consumption in the manufacture of fuel cells. By including external costs, economic benefits of the replacement of ICEV (internal combustion engine) by FCV (Fuel Cell Vehicles) were highlighted as well as the generation of positive social net present values
Basma, Hussein. "Energy management strategies for battery electric bus fleet". Thesis, Université Paris sciences et lettres, 2020. http://thesesprivees.mines-paristech.fr/2020/2020UPSLM036_archivage.pdf.
Texto completoInitiatives to decrease emissions from the transport sector are increasing worldwide by seeking alternative technologies to replace oil-based mobility. Battery Electric Buses (BEB) present a promising solution thanks to their high energy efficiency, low greenhouse gas emissions and the absence of local pollutant emissions. However, this technology still faces many challenges, especially its high total cost of ownership (TCO) and other operational factors such as the limited bus driving range, the high energy refueling time, and the required charging technologies and strategies. In this context, this thesis presents a systematic methodology that aims at developing solutions to help overcoming these challenges by providing optimal battery sizing and charging strategy for BEB. First, a comprehensive multi-physical bus energy model is developed to evaluate its energy needs considering all the energy systems encountered within. The energy consumption of the bus is then evaluated at a variety of operating conditions. Then, a techno-economic model of an entire bus line is developed in order to assess the impact of different battery sizing and charging strategies on the costs and operation of BEB. A TCO model is introduced considering the BEB unit costs, battery purchase and replacement costs, energy and power costs, infrastructure, and maintenance costs. A case study in Paris city is presented and the analysis reveals the resulting tradeoff between the TCO and BEB schedule disruptions and delays as function of different battery sizes and charging strategies. A methodology to minimize the TCO of BEB deployment is presented providing the optimal battery sizing and charging strategy for BEB, while respecting the BEB operation constraints. The methodology is a 2-step optimization algorithm that utilizes both Dynamic programming and Genetic Algorithm optimization routines. The results show that the proposed methodology could reduce the BEB TCO between 15-25% compared to the currently adopted approaches to deploy BEB
Charvát, Lukáš. "Oceňování ocelových konstrukcí". Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226121.
Texto completoGao, Bing-yu y 高秉裕. "Integrated Production Scheduling and Vehicle Routing Problem to Minimize Total Cost". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/52860088294329155240.
Texto completo國立雲林科技大學
工業工程與管理研究所碩士班
101
In the current the supply chain has many kinds of distribution center, and try their best to cost down; however they have many different kinds and also have different fitness strategies, not push-based Supply chain, but pull-based supply chain, and in the pull-based supply chain, how to respond they require is the most important point, and production scheduling and vehicle routing problem are concentrated by the research of the past, but most of them are considered separately; and there is some literature to integrate the production scheduling and vehicle routing problem, but all of the above are focus on how to combine the require and reduce the total deliver times, and the condition appears to the global supply chain or between locations; this research and the literature are different, and it’s appearing at the upward integration distribution center, and focus on how to reduce the vehicle operating cost, routing cost, and earliness, lateness cost. The research mainly discusses distribute in location, and integration production scheduling and vehicle routing problem; the environment considers a pull-based distribution, that is distribution center have multiple customers and requires are known, and objection is how to make the total cost to minimize.
Yu, Shang-Siou y 余尚修. "Integrated Production Scheduling and Multi-Periodic Vehicle Routing Problem to Minimize Total Cost". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/28483563713945559969.
Texto completo國立雲林科技大學
工業工程與管理系
104
In 21st century, the industry is confronted with a huge demand of the consumers. In the fierce competition environment, the supplier must careful considering, how to fast respond customers require. The study presents the minimized total cost of the integrating multi-periodic production and multi-periodic distribution. There is some literature to integrate the production scheduling and vehicle routing problem, but some of the study either consider the single period distribution and complex production, or the multi-periodic production and single production. In order to have a more comprehensive discussion, the study consider the above two points, unrelated parallel machine in the production environment, the multi- periodic in the distribution. The study uses a local search approach, with Particle Swarm Optimization (PSO) algorithm to solve the problem. Through experimental design to compare with differences of the tradition particle swarm optimization and the proposed heuristic particle swarm optimization, confirmed on solving this problem. And the proposed method can indeed give consideration to the quality.
Chen, Yung-lin y 陳勇霖. "Integrated Production Sequence and Vehicle Routing Problem to Minimize the Total Cost with Products Due Day Holding Cost Considering". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/52057737280873673150.
Texto completo國立雲林科技大學
工業工程與管理系
102
The supply chain is an important part when distributing products to customers. The supply chain includes production scheduling and vehicle route planning two parts. The traditional method of production scheduling usually made by production factory to ensure the scheduling could satisfy the demand order, and vehicle route planning usually made by distribution center to ensure the demand order could send in time. The goal of the two planning is different, one is production orientation, and the other is customer orientation. However, many scholars presented that the problem could be integrated together these years. We can considered the products features in the problem to minimize the total cost or maximize the total profit. The research considered the production scheduling, vehicle route planning, and product due day penalty in a problem. The demand information is known to make the production and distribution decision to minimize the total cost.
Tabaro, Simon Rukera. "Optimisation of an innovative system of sustainable production in Rwanda : the integrated rabbit-fish-rice system". Thesis, 2011. http://hdl.handle.net/10413/8590.
Texto completoThesis (Ph.D.)-University of KwaZulu-Natal, Pietermaritzburg, 2011.
Said, Said Alforjani R., M. Emtir y Iqbal M. Mujtaba. "Flexible Design and Operation of Multi-Stage Flash (MSF) Desalination Process Subject to Variable Fouling and Variable Freshwater Demand". Thesis, 2013. http://hdl.handle.net/10454/9720.
Texto completoThis work describes how the design and operation parameters of the Multi-Stage Flash (MSF) desalination process are optimised when the process is subject to variation in seawater temperature, fouling and freshwater demand throughout the day. A simple polynomial based dynamic seawater temperature and variable freshwater demand correlations are developed based on actual data which are incorporated in the MSF mathematical model using gPROMS models builder 3.0.3. In addition, a fouling model based on stage temperature is considered. The fouling and the effect of noncondensable gases are incorporated into the calculation of overall heat transfer co-efficient for condensers. Finally, an optimisation problem is developed where the total daily operating cost of the MSF process is minimised by optimising the design (no of stages) and the operating (seawater rejected flowrate and brine recycle flowrate) parameters.
Mader, Derek Kelvin. "The application of total quality principles to the South African pharmaceutical industry". Diss., 1994. http://hdl.handle.net/10500/17283.
Texto completoEconomic & Management Sciences
M.Com. (Business Economics)
Дрей, М. В. "Методика та організація обліку і аудиту витрат підприємства в контексті управлінського обліку". Thesis, 2019. http://dspace.oneu.edu.ua/jspui/handle/123456789/11061.
Texto completoThe thesis consists of three chapters. The object of study is Public Joint Stock Company «OZGTV». Thesis deals with theoretical aspects of accounting and auditing of costs in the enterprise management system, discussing issues of accounting of operating expenses in modern conditions, defining economic - mathematical modeling of processes of formation and reflection of costs of the enterprise, deficiencies of the method of accounting and auditing of operating costs at the base enterprise are offered and and suggests the ways of their elimination. Author analysis current practice of book keeping and control of operating expenses at the research object, analyses the main financial and economic indicators of activity of the Public Joint Stock Company «OZGTV» Author Ways to improve the methodology of accounting and audit of costs in modern conditions, a list of basic recommendations on possible measures to optimize operating expenses in order to improve the financial condition of the parent enterprise Author offers ways of improvement of book keeping and operating expenses control of condition and movement system in current conditions and carries out economic-mathematical modelling of stocks purchasing optimization possibilities.