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Chabot, Thomas. "Material handling optimization in warehousing operations." Doctoral thesis, Université Laval, 2018. http://hdl.handle.net/20.500.11794/36277.
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Tableau d’honneur de la Faculté des études supérieures et postdoctorales, 2018-2019.Les activités de distribution et d’entreposage sont des piliers importants de la chaîne d’approvisionnement. Ils assurent la stabilité du flux de matières et la synchronisation de toutes les parties prenantes du réseau. Un centre de distribution (CD) agit comme un point de découplage entre l’approvisionnement, la production et les ventes. La distribution comprend un large éventail d’activités visant à assurer la satisfaction de la demande. Ces activités passent de la réception au stockage des produits finis ou semi-finis, à la préparation des commandes et à la livraison. Les opérations d’un CD sont maintenant perçues comme des facteurs critiques d’amélioration. Elles sont responsables de la satisfaction d’un marché en évolution, exigeant des délais de livraison toujours plus rapides et plus fiables, des commandes exactes et des produits hautement personnalisés. C’est pourquoi la recherche en gestion des opérations met beaucoup d’efforts sur le problème de gestion des CDs. Depuis plusieurs années, nous avons connu de fortes avancées en matière d’entreposage et de préparation de commandes. L’activité de préparation de commandes est le processus consistant à récupérer les articles à leur emplacement de stockage afin d’assembler des commandes. Ce problème a souvent été résolu comme une variante du problème du voyageur de commerce, où l’opérateur se déplace à travers les allées de l’entrepôt. Cependant, les entrepôts modernes comportent de plus en plus de familles de produits ayant des caractéristiques très particulières rendant les méthodes conventionnelles moins adéquates. Le premier volet de cette thèse par articles présente deux importants et complexes problèmes de manutention des produits lors de la préparation des commandes. Le problème de préparation des commandes a été largement étudié dans la littérature au cours des dernières décennies. Notre recherche élargit le spectre de ce problème en incluant un ensemble de caractéristiques associées aux installations physiques de la zone de prélèvement, comme les allées étroites, et aux caractéristiques des produits (poids, volume, catégorie, fragilité, etc.). Une perspective plus appliquée à la réalité des opérations est utilisée dans notre développement d’algorithmes. Les déplacements liés à la préparation des commandes sont fortement influencés par le positionnement des produits. La position des produits dans la zone de prélèvement est déterminée par une stratégie d’affectation de stockage (storage assignment strategy). Beaucoup de ces stratégies utilisent de l’information sur les ventes des produits afin de faciliter l’accès aux plus populaires. Dans l’environnement concurrentiel d’aujourd’hui, la durée de vie rentable d’un produit peut être relativement courte. Des promotions peuvent également être faites pour pousser différents produits sur le marché. Le positionnement fourni par la stratégie d’hier ne sera probablement plus optimal aujourd’hui. Il existe plusieurs études mesurant l’impact d’une bonne réaffectation de produits sur les opérations de prélèvement. Cependant, ils étudient la différence des performances avec les positionnements passés et actuels. La littérature démontre clairement que cela apporte des avantages en termes d’efficacité. Toutefois, les déplacements nécessaires pour passer d’une position à une autre peuvent constituer une activité très exigeante. Ceci constitue le second volet de cette thèse qui présente des avancées intéressantes sur le problème de repositionnement des produits dans la zone de prélèvement. Nous présentons le problème de repositionnement des produits sous une forme encore peu étudiée aux meilleurs de nos connaissances : le problème de repositionnement. Plus précisément, nous étudions la charge de travail requise pour passer d’une configuration à l’autre. Cette thèse est structuré comme suit. L’introduction présente les caractéristiques et les missions d’un système de distribution. Le chapitre 1 fournit un survol de la littérature sur les principales fonctions d’un centre de distribution et met l’accent sur la préparation des commandes et les décisions qui affectent cette opération. Le chapitre 2 est consacré à l’étude d’un problème de préparation de commandes en allées étroites avec des équipements de manutention contraignants. Dans le chapitre 3, nous étudions un problème de préparation des commandes où les caractéristiques des produits limitent fortement les routes de prélèvement. Le chapitre 4 présente une variante du problème de repositionnement (reassignment) avec une formulation originale pour le résoudre. La conclusion suit et résume les principales contributions de cette thèse. Mots clés : Préparation des commandes, entreposage, problèmes de routage, algorithmes exacts et heuristiques, réaffectation des produits, manutention.
Distribution and warehousing activities are important pillars to an effective supply chain. They ensure the regulation of the operational flow and the synchronization of all actors in the network. Hence, distribution centers (DCs) act as crossover points between the supply, the production and the demand. The distribution includes a wide range of activities to ensure the integrity of the demand satisfaction. These activities range from the reception and storage of finished or semi-finished products to the preparation of orders and delivery. Distribution has been long seen as an operation with no or low added value; this has changed, and nowadays it is perceived as one of the critical areas for improvement. These activities are responsible for the satisfaction of an evolving market, requiring ever faster and more reliable delivery times, exact orders and highly customized products. This leads to an increased research interest on operations management focused on warehousing. For several years, we have witnessed strong advances in warehousing and order picking operations. The order picking activity is the process of retrieving items within the storage locations for the purpose of fulfilling orders. This problem has long been solved as a variant of the travelling salesman problem, where the order picker moves through aisles. However, modern warehouses with more and more product families may have special characteristics that make conventional methods irrelevant or inefficient. The first part of this thesis presents two practical and challenging material handling problems for the order picking within DCs. Since there are many research axes in the field of warehousing operations, we concentrated our efforts on the order picking problem and the repositioning of the products within the picking area. The order picking problem has been intensively studied in the literature. Our research widens the spectrum of this problem by including a set of characteristics associated with the physical facilities of the picking area and characteristics of the product, such as its weight, volume, category, fragility, etc. This means that a more applied perspective on the reality of operations is used in our algorithms development. The order picking workload is strongly influenced by the positioning of the products. The position of products within the picking area is determined by a storage assignment strategy. Many of these strategies use product sales information in order to facilitate access to the most popular items. In today’s competitive environment, the profitable lifetime of a product can be relatively short. The positioning provided by yesterday’s assignment is likely not the optimal one in the near future. There are several studies measuring the impact of a good reassignment of products on the picking operations. However, they study the difference between the two states of systems on the picking time. It is clear that this brings benefits. However, moving from one position to another is a very workload demanding activity. This constitutes the second part of this thesis which presents interesting advances on the repositioning of products within the picking area. We introduce the repositioning problem as an innovative way of improving performance, in what we call the reassignment problem. More specifically, we study the workload required to move from one setup to the next. This thesis is structured as follows. The introduction presents the characteristics and missions of a distribution system. Chapter 1 presents an overview of the literature on the main functions of a DC and emphasizes on order picking and decisions affecting this operation. Chapter 2 is devoted to the study of a picking problem with narrow aisles facilities and binding material handling equipment. In Chapter 3, we study the picking problem with a set of product features that strongly constrain the picking sequence. Chapter 4 presents a variant of the reassignment problem with a strong and new formulation to solve it. The conclusion follows and summarizes the main contributions of this thesis. Key words: Order-picking, warehousing, routing problems, exact and heuristic algorithms, products reassignment, material handling.
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Conde, Carvalhal Carlos. "Safety Optimization of Material Handling Forklift Truck Operations." Thesis, KTH, Industriell produktion, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-280832.
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The prevention of incidents and injuries is fundamental for any industry activity since those events may result in serious economic, environmental, and human losses. Due to the centralization of Linde filling operations within Sweden, several of their plants are being phased out to move the production to Enköping. The elevated raise of Linde's production led to a high increase of forklift drivers and stock levels and consequently brought up the number of incidents related to forklift driving. This thesis aims to obtain knowledge to mitigate forklift truck related safety hazards as well as understand how to eliminate risks and unsafe situations at this type of operation. This project was divided into 3 phases. Phase I consisted of understanding operations routines and its safety risks, assessing Enköping site internal state (with a safety survey, and several visits and interviews), and benchmarking the most common practices based on other companies' forklift-related processes (with visits and interviews). In phase II, parallelly to ISite software implementation, studies utilizing different engineering tools (Spaghetti Diagram, VSM, Fishbone Diagram, and FMEA) were performed in order to gather information and understand how to optimize the site's forklift-related safety. In this phase, a tailored observational KPI was developed in order to assess the site independently of incident measurement regarding four groups: Site, Pedestrian activity, Forklift operation, and Forklift operator behavior. In phase III, all data acquired was discussed, and conclusions were made based on the data analysis and discussions of the results of Phase II implementation allied with the theoretical references. The survey findings showed the high degree of importance given to safety at Linde in Enköping. It also revealed, in addition to all engineering tools applied, which elements should be focused in order to optimize the forklift trucks operational safety (mainly related to Technology dimension). Based on the benchmark comparison, it is possible to allege that the absence of a maintenance facility is the main disadvantage of Linde in Enköping. In contrast, the usage of I-Site fleet management software represents an important step towards safety. The I-Site knowledge and the awareness of its benefits grew among management and operators as setup issues, and technical malfunctioning was eliminated. The observational KPI has obtained preliminary overall values above 0,82 for all groups (on a scale of 0 to 1), proving itself capable of measuring the safety performance and identifying risks and unsafe situations.Att förebygga incidenter och skador är grundläggande för all branschaktivitet eftersom dessa händelser kan leda till allvarliga ekonomiska, miljömässiga och mänskliga förluster. På grund av centraliseringen av Lindes fyllningsverksamheten inom Sverige har flera av deras anläggningar fasats ut för att flytta produktionen till Enköping. Den utökade produktionen på Linde Enköping skapade behov av fler truckförare, högre lagernivåer och ökade följaktligen antalet incidenter relaterade till gaffeltruck. Avhandlingen syftar till att få kunskap för att mildra säkerhetsrisker för gaffeltruckar samt förstå hur man kan eliminera risker och osäkra situationer vid denna typ av verksamhet. Detta projekt delades in i tre faser. Fas I bestod av att förstå driftsrutiner och dess säkerhetsrisker, utvärdera det interna tillståndet på Linde Enköpings arbetsplats (med en säkerhetsundersökning, flera besök och olika intervjuer) och benchmarka de vanligaste metoderna baserat på andra företags gaffeltruckrelaterade processer (med besök och intervjuer). I fas II, parallellt med I-Site-programvaruimplementering, utfördes studier med olika tekniska verktyg (Spaghetti Diagram, VSM, Fishbone Diagram och FMEA) för att undersöka och förstå hur man optimerar verksamhetens gaffeltruckrelaterade säkerhet. I denna fas utvecklades en skräddarsydd observations-KPI för att utvärdera verksamheten oberoende av att mäta incidenter avseende fyra grupper: Plats, fotgängare, gaffeltruck och beteende för gaffeltruck. I fas III diskuterades alla förvärvade data, slutsatser gjordes baserade på dataanalysen och diskussionerna om resultaten av fas II-implementering tillsammans med teoretiska referenser. Undersökningsresultaten visade hur högt säkerhet prioriteras vid Linde Enköping. Den avslöjade också, utöver alla tillämpade konstruktionsverktyg, vilka element som bör fokuseras på för att optimera truckens driftssäkerhet (främst relaterad till teknikdimension). Baserat på den benchmarking som genomfördes är det möjligt att hävda att frånvaron av underhållsanläggning är den största nackdelen med Linde i Enköping. Däremot är användningen av mjukvara för I-Site-flottanhantering ett viktigt steg mot säkerheten. Kunskapen om I-SITE och medvetenheten om dess fördelar växte bland ledningen och operatörerna när installationsproblem och tekniska funktionsfel eliminerades. Utfallen för observations-KPI har erhållit preliminära totalvärden över 0,82 för alla grupper (i en skala från 0 till 1), och visar sig kapabel att mäta säkerhet i genomförande samt att identifiera risker och osäkra situationer.
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Almeida, Miguel Alexandre Dias. "Planning, operations and data handling of planetary science missions." Master's thesis, FCT-UNL, 2011. http://hdl.handle.net/10362/7081.
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Dissertação para obtenção do Grau de Mestre em
Engenharia FísicaSince the dawn of human kind the celestial sphere has had a special place in our imagination. I always felt the same passion for the cosmos. In particular, fuelled by the journeys of discovery of the Solar System, I always dreamed of dedicating myself to planetary exploration. To follow that idea I studied physics and, in 1999, I finally got the opportunity to work in Planetary Science research. It all started in the Lisbon Observatory, where I was able to analyse infrared data from the Jupiter orbiter, Galileo, collected by its Near-Infrared Mapping Spectrometer (NIMS). At this stage I learned some methods used in data analysis. I continued my career in the European Space Agency in the Science Planning of the SMART-1 lunar spacecraft. I remained in this mission for the following seven years, and saw my responsibilities grow. I started by giving technical support to the Project Scientist. By the end of the mission I had been a major player in the setup of the planning system, and worked in all capacities within the SMART-1 Science and Technology Operations Centre, and the Advanced Moon Micro-Imager Experiment (AMIE). Finally, in 2006, I started working in the Venus Express project as a Liaison Scientist for the Venus Monitoring Camera (VMC) instrument. I was able to re-work the VMC planning system with the Principal Investigator in order to gather more valuable science data. While this optimization was done, and since the spacecraft was already orbiting Venus, my duties also included, and still do, to plan and operate the VMC camera. During my entire career I have had two side projects running along my main tasks. I always had an interest for innovation and some of my ideas developed to integral parts of my main projects. I also always kept an interest in data analysis, as time permitted, that I carried with NIMS, AMIE and VMC.
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Chung, Carl Yuk Kay. "Managing ramp operations at airport : issues, models and solution methods /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?IEEM%202005%20CHUNG.
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Lopes, Octávio Antunes. "RFID and the internet of things in freight and handling operations." Master's thesis, Instituto Superior de Economia e Gestão, 2010. http://hdl.handle.net/10400.5/2225.
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Master in Management and Industrial StrategyRFID technology (Radio Frequency IDentification) is an automatic identification method relying on storing and remotely retrieving data using devices (RFID tags or transponders) enabling the contactless identification of objects. RFID has been around for decades but only during the last years has become one of the most promising research areas with more and more attention focused on it. The retail sector had been leading the way with logistics applications, followed by some government agencies with identification systems and by different sectors of activity (pharmaceuticals, aircraft manufacturing, etc). Together with the last technological developments, new ideas and concepts are generating new paradigms as the "Internet of Things". The "Internet of Things" can be described as "Things having identities and virtual personalities operating in smart spaces using intelligent interfaces to connect and communicate within social, environmental, and user contexts ".1 Also during the last decades, air transportation has become more and more important for people mobility and goods transportation in the global economy environment. According to IATA , RFID can be used as a way to improve a range of airline business processes while cutting costs. IATA had developed a standard for RFID baggage tags and recommended practices and business cases for the use of RFID in baggage handling. With this study it is planed to analyse the situation in the two main airports in Portugal (Lisbon and Oporto), based in Portway ground handling operations, compare it with some actual developments, the E-Cab Project and IATA proposals and recommendations, and to evaluate scenarios and their feasibility in a near future.
A tecnologia RFID (Radio Frequency IDentification) é um método de identificação automático de armazenamento e recuperação remota de informação, recorrendo a dispositivos (etiquetas ou transmissores-receptores RFID) que permitem a sua leitura à distância e sem necessidade de qualquer contacto directo com os objectos. Sendo uma tecnologia já com décadas de existência, só durante os últimos anos é que se tem evidenciado como uma das mais promissoras , captando cada vez mais atenção por parte dos diversos actores. O sector de retalho tem vindo a promover a sua divulgação, liderando o desenvolvimento de diversas aplicações logísticas e sendo seguido, durante os últimos anos, por algumas agências governamentais com o desenvolvimento de sistemas de identificação e por diversos outrossectores de actividade (farmacêutica, construção aeronáutica, etc). Em simultâneo com os mais recentes progressos tecnológicos e com o desenvolvimento de conceitos mais inovadores, um novo paradigma tem aparecido com a designação da "Internet dos Objectos". A "Internet dos Objectos" pode ser descrita como "objectos possuindo identidades e personalidades virtuais operando em espaços inteligentes usando interfaces inteligentes para ligar e comunicar em contextos sociais, ambientais e no seio dos utilizadores". Também durante as últimas décadas, o transporte aéreo tem vindo a desempenhar um papel cada vez mais importante para a mobilidade das populações e para o transporte de mercadorias no ambiente da economia global. De acordo com a IATA, as tecnologias RFID poderão vir a ser utilizadas com sucesso, reduzindo custos e melhorando um vasto conjunto de processos correntes no sector, tendo já desenvolvido alguns normativos e recomendações relativas à aplicação de etiquetas RFID na identificação e monitorização de bagagem. Com este trabalho pretende-se analisar a situação nos dois principais aeroportos Portugueses (Lisboa e Porto), baseada nas operações de handling da Portway, comparar os resultados obtidos com os desenvolvimentos actuais resultantes do Projecto E-Cab e com as propostas e recomendações da IATA, avaliando cenários e a possibilidade da sua concretização num futuro próximo.
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Setty, Prashant (Prashant Neelappanavara). "Optimal handling of Highly Active Pharmaceutical Ingredients during milling and blending operations." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/81020.
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Thesis (M.B.A.)--Massachusetts Institute of Technology, Sloan School of Management; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering; in conjunction with the Leaders for Global Operations Program at MIT, 2013.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 32-33).
This thesis investigates best practices for Highly Active Pharmaceutical Ingredient (HAPI) milling and blending. We utilize a qualitative analysis centering on a benchmarking study and quantitative analyses using a probabilistic capacity simulation and tradeoff methodology. The analyses indicate that the growing number of HAPI products in a manufacturer's portfolio may result in capacity constraints. Therefore, we recommend that manufacturers pursue process improvement technologies. Suggested process improvements include implementing online particle size measurement and Wash in Place (WIP) and Clean in Place (CIP) cleaning systems. Online particle size measurement allows for better process control and eliminates the need for HAPI blending for homogenization. Automated WIP and CIP systems decrease changeover time and allow for higher equipment availability. Additionally, the results of the analyses suggest that manufacturers consider standardizing transportation containers with the upstream vendors and downstream consumers. Lastly, from an organizational standpoint, we recommend that manufacturers include both subject matter experts and operations personnel when developing and implementing internal guidelines so as to ensure the guidelines are practical and uniformly applied.
by Prashant Setty.
S.M.
M.B.A.
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Park, Byung Chun. "Analytical models and optimal strategies for automated storage/retrieval system operations." Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/24568.
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Reichart, Christiane. "Materials handling in hospitals: an analysis of how the storage and materials handling system can be improved, using the example of Hospital Santa Maria." Master's thesis, NSBE - UNL, 2010. http://hdl.handle.net/10362/10277.
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A Work Project, presented as part of the requirements for the Award of a Masters Degree in Management from the NOVA – School of Business and EconomicsWarehousing costs and especially order picking costs account for a considerable amount of total logistics costs, what leads to the purpose of this paper which is to elaborate means by which the materials handling process of hospitals can be improved. A detailed analysis of the material storage and picking process at Hospital Santa Maria is carried out in order to demonstrate best practices as well as main limitations for which solutions are developed. The findings are that the introduction of within-aisle storage, electric foldable picking vehicles and pick-by-voice system in combination with the Japanese concept Kaizen can improve warehouse operations drastically.
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Genser, Bradley Philip. "Optimizing procurement and handling costs in a utility." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/90758.
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Thesis: M.B.A., Massachusetts Institute of Technology, Sloan School of Management, 2014. In conjunction with the Leaders for Global Operations Program at MIT.Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014. In conjunction with the Leaders for Global Operations Program at MIT.
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Cataloged from PDF version of thesis.
Includes bibliographical references (page 111).
We propose a novel method to quantify the cost of activities involved in the picking portion of order fulfillment. We adapt the general method of picking cost quantification to the specific situation of TP&G, a publicly held utility, to build a simulation model which calculates total cost (procurement purchasing costs + material handling costs) across TP&G's Construction Materials Supply Chain (CMSC) . We use the simulation model to demonstrate the effect of case pack quantities and various disputed (within TP&G) material handling policies on supply chain costs. Finally. we move beyond the descriptive results of the simulation model and build optimization models for a case where a single case pack quantity is held in inventory, under conditions of both deterministic and stochastic demand. We show that case pack quantity held in inventory greatly impacts supply chain costs. We also find the novel result that the optimal material picking policy for both deterministic and stochastic demand is a threshold policy whereby orders should be fulfilled with whole case packs up to the highest possible multiple of case pack quantity that does not exceed an ordered quantity. If the remainder of an order to be fulfilled exceeds a certain number of units in a case pack, that remainder should be fulfilled with a whole case pack (overfilled). This threshold can be efficiently calculated for all case pack quantities (optimal or not).
by Bradley Philip Genser.
M.B.A.
S.M.
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Carlson, Valerie, and Bénédicte Lindblom. "Airport ground operations through the lens of human-technology systems : a descriptive case study of ground operations at a Swedish airport." Thesis, KTH, Ergonomi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-291871.
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Summary Aim: The aim with the study was to explore the work conditions of the Ground staff performing unloading and loading from an HTO perspective, and to identify areas for improvement. Research questions: 1. Which factors are important for the work performance? 2. To what degree do the employees follow the work instructions regarding the use of the equipment on the ramp? 3. Which recommendations can be provided to improve work performance at ramp operations and minimize risks for accidents? Background: Ramp operations have, according to Studic et al., (2017), repeatedly been estimated as one of the areas with the highest, still increasing, safety risks. Passenier, Sharpanskykh and de Boer (2015) also confirms how the work within the ramp operations, and performance of unloading and loading, is an area with high risks of injuries and deaths. Methods: The study was conducted with a qualitative research approach and Descriptive Case study design (Baxter & Jacks, 2008). Results: Five categories were found; time pressure, “safety mindset”, education, culture and equipment. The findings also showed that the employees prioritize the safety of the aircraft rather than their own safety. Conclusions: Out of the five factors, time pressure and equipment are the factors in the environment which the respondents have to work in line with to make it function in the environment.
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Zhang, Lu, and 張露. "A genetic approach to simultaneous scheduling of container handling operations in a container terminal." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B42841264.
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Zhang, Lu. "A genetic approach to simultaneous scheduling of container handling operations in a container terminal." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B42841264.
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Wong, Man-ying, and 黃文英. "A manual handling operations training program for healthcare workers in preventing back pain and injury." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B44626605.
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Primack, Willow. "Analysis and productivity improvement of an automated material handling system through simulation." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/99026.
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Thesis: M.B.A., Massachusetts Institute of Technology, Sloan School of Management, 2015. In conjunction with the Leaders for Global Operations Program at MIT.Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015. In conjunction with the Leaders for Global Operations Program at MIT.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 66-67).
As Amazon.com has grown, the company has invested in warehouse systems similar to those traditionally found in manufacturing. These systems are a complex and interconnected set of manned work processing stations linked together by conveyance. This thesis examines one such system, arranged as a set of parallel single piece workflow lines joined by a central computerized sorter that route work between lines, and examines the effect of sorter algorithms and line capacity on production output. Work studies, interviews, and a practical experiment suggest a deterioration in the feedback provided to the central sorter for work routing. A Monte Carlo simulation model of the system further supports this hypothesis, suggesting that system throughput is 11.7% lower than a system that perfectly routes work to line in a pull fashion. While perfect routing is not practically feasible, the thesis then explores two routing heuristics designed around starvation response and dynamic capacity analysis, which simulation suggest may yield a 6.73% increase in throughput. In doing so, the thesis provides a case study on process improvement using simulation to characterize a complicated mechanical production system that is otherwise analytically intractable.
by Willow Primack.
M.B.A.
S.M.
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Gallo, Antonio. "Magnetic field sensors suitable for high temperature and vacuum operations and for remote handling in harsh environment." Doctoral thesis, Università degli studi di Padova, 2011. http://hdl.handle.net/11577/3427514.
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In the context of the alternative technologies for energy production, nuclear fusion is the most promising in order to reduce global dependence on fossil fuels such as oil and coal. Fusion research aims at developing a new energy source in the medium term and it should be engineered in the second half of this century, coming alongside the current technologies.
Research on tokamak such as JET and ITER (DEMO in the future), based on the plasma confinement through the use of magnetic fields, is at present the most promising and should provide important results in the coming two decades.
In this context magnetic diagnostics are of great importance, providing key information on the confinement of high temperature plasma and allowing an active control on the position and shape of the plasma itself.
This work deals with the design, development and production of magnetic sensors, suitable for operation in hostile environments such as the ITER vacuum vessel. These sensors are designed to withstand high temperatures and intense neutron irradiation and have to be installed behind the plasma first wall, in contact to the vessel. These sensors have been built in order to measure magnetic fields having a frequency between 50Hz and 10 kHz.
This work is structured as follows:
• Chapter 1 provides an overview of the energy problem and describes the theoretical basis of nuclear fusion
• Chapter 2 introduces the importance of the magnetic diagnostic in the thermonuclear fusion research and lists the sensors used in existing machines (JET, RFX-mod, JT60), with a focus on the issues related to ITER
• Chapter 3 describes the development and construction of a new type of sensor built using the LTCC technology. This chapter lists the tests and the micrographic analysis carried out upon these new sensors
• Chapter 4 describes the development and construction of a new sensor formed by a copper wire with fiberglass insulation (called POZh) wound on a metallic reel
• Chapter 5 describes the design of the platform necessary to support these sensors (LTCC/POZh) within the ITER vacuum vesselNell’ambito delle tecnologie alternative per la produzione di energia la fusione termonucleare controllata appare la più promettente allo scopo di diminuire la dipendenza mondiale dai combustibili fossili quali il petrolio e il carbone. La ricerca sulla fusione mira allo sviluppo di una nuova fonte energetica nel medio termine e dovrebbe trovare ingegnerizzazione nella seconda metà di questo secolo, affiancando le attuali tecnologie. La ricerca sui tokamak quali JET e ITER e il futuro DEMO, basata sul confinamento del plasma attraverso l’utilizzo di campi magnetici, appare allo stato attuale la più promettente e dovrebbe fornire risultati importanti già nei prossimi due decenni. Nell’ambito della fusione termonucleare controllata grande importanza rivestono le diagnostiche magnetiche, che forniscono informazioni fondamentali sullo stato del plasma e permettono un controllo attivo sulla posizione e la forma dello stesso. Questa tesi si occupa dell’ideazione, sviluppo e produzione di due nuove tipologie di sensori magnetici, adatti al funzionamento in ambienti ostili quali l’interno della camera da vuoto (vessel) di ITER. Tali sensori sono stati ideati per resistere ad alte temperature e ad intensi bombardamenti neutronici e dovranno essere installati dietro la prima parete del vessel, a contatto dello stesso. Si tratta di sensori per campi magnetici aventi una frequenza compresa tra 0.001Hz e 10kHz. La tesi è così strutturata: • Il capitolo 1 fornisce una visione di massima sul problema energetico e descrive i rudimenti teorici della fusione nucleare • Il capitolo 2 introduce il problema delle diagnostiche magnetiche elencando i tipi di sensori utilizzati in macchine esistenti (JET, RFX-mod, JT60), con un approfondimento delle problematiche relative ad ITER • Il capitolo 3 descrive lo sviluppo e la produzione di diversi set di sensori costruiti utilizzando la tecnologia LTCC. Tale capitolo elenca i test e le analisi micrografiche effettuate • Il capitolo 4 descrive lo sviluppo e la costruzione di una serie di sensori costruiti mediante la tecnologia del cavo avvolto usando cavi in rame con isolamento in fibra di vetro denominati POZh • Il capitolo 5 descrive il progetto di una struttura necessaria al supporto di tali sensori (LTCC/POZh) all’interno del vessel di ITER
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Fitouri, Trabelsi Salma. "Contribution to the organization of ground handling management at airports." Thesis, Toulouse, INPT, 2013. http://www.theses.fr/2013INPT0118/document.
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La croissance du trafic aérien a rendu critique l’opération de la gestion des plateformes aéroportuaires. Celle-ci fait appel à de nombreux acteurs (autorités aéroportuaires, compagnies aériennes, contrôle du trafic aérien, prestataires de services, …). Le concept d’Airport Collaborative Decision Making (A-CDM) développé depuis une dizaine d’années est basé sur un partage d’informations opérationnelles en temps réel entre les différents acteurs de la plate-forme, permettant de prendre des décisions en commun pour rechercher une utilisation optimale, en toutes conditions, des capacités de l’aéroport. L’objectif principal de cette thèse est de contribuer à l’organisation de la gestion des opérations d’escale dans une plateforme aéroportuaire. Il s’agit de proposer une structure d’organisation de cette opération qui soit compatible avec l’approche A-CDM. La structure proposée introduit un coordinateur des opérations d’escale (GHC) qui joue le rôle d’interface de communication entre les partenaires de l’A-CDM et les différents gestionnaires des opérations d’escale (GHM). Cette structure hiérarchique permet d’une part de partager des informations avec les partenaires de l’A-CDM et d’autre part d’interagir avec les gestionnaires des opérations d’escale (GHM). Les processus de prise de décision basés sur des heuristiques ont été développés à chaque niveau de l’organisation proposée et sont évalués aussi bien dans le cas de conditions nominales que dans le cas de la présence de perturbations majeuresThe increase of the world air traffic growth of the last decades has generated a permanent challenge for civil aviation authorities, airlines and airports to supply sufficient capacity to provide a safe transportation service with acceptable quality standards. New traffic management practices, such as A-CDM, based on multi-agent and collaborative decision making concepts have been introduced at airports. However, within the turnaround process of aircraft at airports, ground handling management of aircraft has not been developed specifically in the A-CDM approach, even if it has an important role in the fluidity of aircraft operations at airports. The main objective of this thesis dissertation is to contribute to the organisation of the ground handling management at airports. It consists to provide a structure organize the ground handling management compatible with the A -CDM concept. The proposed structure introduces a ground handling coordinator (GHC) which is considered as an interface for communication between the partners of the A -CDM and the different ground handling managers (GHM). This hierarchical structure allows sharing information with partners in the A -CDM on the one side and on the other side, interacting with ground handling managers (GHM). Decision making processes based on heuristics have been developed at each level of the proposed organization and have been also evaluated in the case of nominal conditions and in the case of the presence of major disruptions
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Mäkinen, Emanuel, and Ellen Broström. "Competitive logistics management : Guidelines for handling logistical challenges in chain store warehouses." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-10201.
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During the last decades, it has been brought to light that well organized logistics processes have contributed to competitive advantages for companies. Mio AB, a chain store warehouse and the second largest furniture company in Sweden, is operating in the middle of an expansion phase with growing revenue. As a consequence, larger volumes of goods are handled, space utilization become more scarce and the everyday operations within the internal logistics are affected. Therefore, the processes within the warehouse department were measured by performing a frequency study, registering how time was distributed between the different work tasks. In order to fully understand the processes, interviews were held with management and personnel. After analyzing previous research that could help guide to ease the impositions and analyzing the result of the frequency study, wastes were identified and new ways of working were suggested. The result firstly presents how to organize internal logistics operations in chain store warehouses to gain competitive advantage. Secondly, keeping in mind that firefighting stressed situations usually is not sustainable and only eases loads temporarily, long-term sustainability and ethics were addressed. Concluding that in order to optimize internal logistics operations in chain store warehouses and gain a long-term competitive advantage in a sustainable way, are achieved through standardizing work tasks, ensuring commitment of management and personnel and applying systems to serve the people and processes. Lastly it is advised to keep in mind the impact a company have on its surroundings and the importance of engaging in sustainable and ethically friendly operations, in order to achieve long-term competitive logistics.
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GIAMMUSSO, CALOGERO. "Analisi dell’inquinamento atmosferico prodotto dalle operazioni aeroportuali e impiego di soluzioni energetiche innovative secondo il paradigma del “Hydrogen Airport”." Doctoral thesis, Politecnico di Torino, 2013. http://hdl.handle.net/11583/2507379.
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La costante crescita del trasporto aereo ha determinato sugli aeroporti a livello locale un incremento dell’impatto acustico e atmosferico prodotto dalle operazioni aeree. L’aumentata sensibilità sulle tematiche ambientali da parte delle comunità, che vivono in prossimità degli aeroporti, rappresenta oggi uno dei limiti più stringenti per i piani di sviluppo aeroportuali. Negli ultimi anni diversi piani di sviluppo aeroportuale (esempio Milano-Malpensa, Londra-Heathrow, Parigi-Beauvais, Amsterdam Schiphol) hanno subito ritardi, limitazioni e addirittura cancellazioni a causa dell’opposizione dei cittadini motivata da preoccupazione per l’impatto ambientale. E’ infatti opinione diffusa che nei paesi maggiormente sviluppati le esternalità sull’ambiente abbiano superato per importanza gli effetti positivi del trasporto aereo sulla crescita economica (Panetta, 2003). La futura espansione del trasporto aereo e, in particolare, degli aeroporti non sarà quindi condizionata solo da fattori economici, ma anche da considerazioni di carattere sociale ed ecologico.
Le emissioni gassose e acustiche prodotte dagli aerei sono problemi ben noti dall’avvento dei motori a reazione e nel tempo hanno visto istituzioni, enti di ricerca e industria attivamente impegnati nella ricerca di nuove soluzioni tecniche. L’inquinamento atmosferico degli aeroporti non è prodotto solamente dagli aeromobili durante i cicli LTO (Landing and Take-Off), ma anche dai mezzi GSE (Ground Support Equipment) durante le attività di assistenza a terra.
In questo quadro di riferimento, il presente lavoro vuole contribuire allo studio delle emissioni gassose prodotte da aeromobili e dai mezzi GSE durante le operazioni aeroportuali proponendo anche soluzioni tecnologiche innovative (uso dell’idrogeno gassoso) per ridurre l’inquinamento atmosferico su scala locale.
Nella prima parte sono stati studiati i livelli di concentrazione delle emissioni prodotte dai velivoli sui piazzali aeromobili dove opera il personale addetto alle operazioni di assistenza a terra e dove avvengono le operazioni di imbarco e sbarco dei passeggeri.
Il processo di dispersione degli inquinanti dietro un aeromobile in idle è stato studiato attraverso un analisi CFD (computational fluid dynamics). Obiettivo dello studio è la verifica della definizione di Jet-Blast data dall’ICAO, che indica come soglia per il comfort delle operazioni dietro un aereo una velocità dei gas di scarico pari a 56 km/h senza considerare i livelli di concentrazione degli inquinanti che possono essere raggiunti. Diversamente dagli studi presenti in bibliografia, che simulano la dispersione atmosferica degli inquinanti in aeroporto mediante modelli stazionari “Gaussiani” su macro scala ipotizzando una sorgente puntiforme, in questo lavoro il processo di dispersione degli inquinanti è stato valutato considerando le caratteristiche dei motori aeronautici su una scala comparabile alle dimensione del piazzale aeromobili con l’obiettivo di verificare i livelli di concentrazioni degli inquinanti a cui sono esposti il personale aeroportuale e i passeggeri.
Il modello CFD ha permesso di calcolare i livelli di concentrazione di monossido di carbonio (CO), formaldeide (CH2O) e acroleina (C3H4O) dietro un Boeing 737-500 con motori in idle. Le curve isolivello di concentrazione ottenute sono state confrontate con le soglie di esposizione definite dalla comunità scientifica per garantire la salute umana. L’analisi dei livelli di concentrazione degli inquinanti è stata svolta per tre diversi casi di studio che corrispondono a tre configurazioni reali dei piazzali aeroportuali.
Nella seconda parte dello studio, invece, per ridurre l’inquinamento ambientale prodotto dai mezzi GSE durante le operazioni di handling aeroportuale, è stato studiato il possibile impiego della tecnologia fuel cell a idrogeno. L’obiettivo dell’attività di ricerca è duplice:
• valutare il beneficio ambientale ottenibile mediante l’impiego della tecnologia fuel cell come sistema propulsivo per i mezzi GSE;
• eseguire uno studio di fattibilità di una GPU a idrogeno con sistema fuel cell.
Nonostante in letteratura siano presenti studi inerenti l’impiego dell’idrogeno in aeroporto e siano state svolte delle sperimentazioni presso alcuni scali internazionali, non sono disponibili dati inerenti il reale beneficio ambientale che si può ottenere usando l’idrogeno nella propulsione dei mezzi GSE.
Per svolgere tale analisi è stato realizzato un modello che calcola l’inventario delle emissioni prodotte da una flotta mista composta da mezzi GSE convenzionali (ovvero motori alimentati con combustibili fossili) e da mezzi GSE convertiti a idrogeno, considerando sia le emissioni dirette prodotte durante la combustione del carburante, sia le emissioni indirette rilasciate per la produzione del carburante stesso. Il modello è stato sviluppato in modo parametrico per considerare vari scenari in termini di dimensioni aeroportuali, fleet mix di operazioni aeroportuali e tipologie di mezzi GSE convertiti a idrogeno. Inoltre il modello calcola il consumo di combustibile fossile e il fabbisogno di idrogeno richiesto per alimentare la flotta GSE convertita. Per la produzione dell’idrogeno in aeroporto sono state valutate due possibili tecniche: elettrolisi e methane steam reforming (SMR). Dato che l’elettrolisi è la tecnica di produzione meno inquinante tra le due, il modello calcola la potenza dell’impianto di produzione necessario per garantire il fabbisogno di idrogeno in funzione dello scenario considerato e la dimensione dell’impianto di stoccaggio. L’idea Hydrogen Airport è stata completata con uno studio di fattibilità per la conversione a idrogeno di un mezzo GPU (Ground Power Unit) che comprende: sviluppo di un modello CAD, scelta e dimensionamento dei sistemi, verifica della safety nell’impiego dell’idrogeno e analisi preliminare dei costi.
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Alonso, Tabares Diego. "Contribution à l'automatisation des opérations au sol des aéroports." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30225.
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The sustainability of air transport relies on proper and timely aircraft ground handling. Lack of manpower and current ground handling industry conditions makes innovation and automation the only way to support existing growth rates. This research presents the state of the art of aircraft ground handling at airports, identifying the challenges to overcome in building safe, efficient and environmental friendly automated ground operations. The greatest opportunity lies with automated docking of ground support equipment to aircraft, with further autonomous vehicles moving around the aircraft and automated systems within the aircraft later on. The problem formulation for resources assignment for ground handling in a fully automated environment is undertaken. On-line solutions for the fleet assignment problem are proposed and applied to an airport caseLa durabilité du transport aérien est basée sur le bon déroulement de la manutention des avions. Le manque de main d’œuvre et les conditions existantes sur l’industrie de la manutention au sol fait que l’innovation et l’automatisation sont la seule façon de maintenir le rythme de croissance actuel. Cette recherche présente l’état de l’art de la manutention au sol des avions, identifie les défis à résoudre pour parvenir à des opérations au sol sécurisées, efficaces et respectueuses de l’environnement. La meilleure opportunité est dans l’accostage automatique des matériels au sol à l’avion, avec des véhicules autonomes qui vont évoluer autour de l’avion et des systèmes automatisés dans l’avion lui-même. La formulation du problème pour l’allocation des ressources pour la manutention au sol des avions dans le cadre totalement automatisé est entreprise. Des solutions en ligne pour le problème d’assignation des flottes sont proposées et appliquées dans un aéroport
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Ndeanaefo, Aloysius Okey. "Priests' Perceptions of the Leadership Styles of U.S. Catholic Bishops." ScholarWorks, 2018. https://scholarworks.waldenu.edu/dissertations/5506.
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The United States Catholic bishops have used their authority to address the child sexual abuse scandal, but it has been problematic that no one has yet evaluated their exercised leadership styles. In this phenomenological study, I explored U.S Catholic priests' perceptions of the bishops' leadership styles related to how they handled the child sexual abuse scandal. Knowing the bishops' leadership styles was paramount to fill the research gap. The theoretical frameworks underpinning this study were transformational leadership, transactional leadership, charismatic leadership, and servant leadership. Data collected through interviews with 11 Catholic priests revealed their perceptions of how the behavioral characteristics of each leadership style influenced the management of the child sexual abuse scandal. Collected data were deductively coded, then subjected to a thematic analysis procedure. The research findings highlighted the bishops' predominant use of servant leadership style. The resulting themes were that (a) the bishops felt they were forced to listen, (b) they lacked the charisma to convince, (c) they were more interested in protecting the church, and (d) they paid remunerations to victims. The U.S Catholic bishops would benefit from this study as it reveals the remaining gaps in their predominant use of servant leadership style. The positive social change implications point to the bishops' using this study to facilitate more effective leadership styles when handling and preventing similar future crises while collaborating with the clergy, the religious, the faithful, and law enforcement officials in creating and sustaining awareness of child abuse prevention policy to avert future harms.
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Landbø, Anders Richard. "From Newbuilding to Operation : Information Handling in Ship Management." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-11586.
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In this thesis, I have looked into the current practice of information handling within a ship management. The work is done in cooperation with Höegh Fleet Service, and all the described processes and the organizational structure is based on them. The main purpose was to investigate the current transferring process of vessel information between the newbuilding phase and the operation phase. After this, I have evaluated the quality and efficiency, and also proposed concrete strategies for improvements in this process. I have assessed two of the more common processes that regularly are performed by the technical ship management. These are: "Procurement of equipment and goods to the vessels", and "the drydocking process". The reason for this was to investigate the flow of information between the participants involved, and to identify the origin of the information exchanged and used in these two processes. Then, I have looked at the used information which in these processes is originated from the newbuilding phase to see how this currently was transferred and implemented into the operation phase. In two areas, I have identified potential room for improvements. The first was in the transfer and handling of warranty agreements, and the second was in the implementation of digital manuals and drawings. In addition to this, I also learned that there was a desire to improve the transfer of history and experience from a vessel between the different participants involved throughout its entire lifetime. In the third part, I have stated the best possible result after the process of transfer and implementation of information from newbuilding to operation. This was with regards to the areas where I previously had identified potential room for improvement. In addition, I have also looked into how history and experience should be saved and exchanged between the different participants involved during the vessels lifetime. In the final part, I have proposed concrete solutions and strategies that in the best manner meet the "best result" statement. These solutions emphasizes not to make too many changes to the already existing systems, and to be easy to implement and use.
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Chittratanawat, Sarawoot. "Operation based facilities design /." free to MU campus, to others for purchase, 2001. http://wwwlib.umi.com/cr/mo/fullcit?p3025611.
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Zhao, Changhui. "Strategic and operational plan for better material handling." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/46544.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2008.Includes bibliographical references (leaf 65).
Currently the material handling in NPC Singapore is done manually via forklift trucks. As the production volume increases and a new product launches, the current capacity will not be sufficient for 2012. In order to avoid the production loss and increase the operational efficiency, four solutions have been tested, including forklift trucks and labor extension, Kanban redesign in staging areas, conveyor implementation in staging areas and automating the transportation between the warehouse and production via implementing AGVs or transfer cars. In this thesis research we specifically analyze the use of AGVs and transfer cars. By implementing two transfer cars in 2012, the system capacity will remain adequate until 2018. This investment provides a $364,165 net present value and a 29% internal rate of return.
by Changhui Zhao.
M.Eng.
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Dong, Wenyan 1980. "Improved handling of the decoding operation in the Presto compiler." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/33140.
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Thesis (M. Eng. and S.B.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.Includes bibliographical references (leaves 62-63).
This thesis presents a research project on decoder related optimizations in HDL de- signs. The goal of the research is to improve design synthesis quality-of-result, mainly in terms of area; this involves sharing decoders driven by related inputs, and map decoders using fewer number of boolean gates. Algorithms presented in this thesis were implemented in the Presto HDL compiler. A series of tests were conducted using real-world HDL designs in order to determine how effective these optimizations are.
by Wenyan Dong.
M.Eng.and S.B.
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STRÖM, CHRISTIAN. "Adapting Value Stream Mapping to Circular Product Flows. : From Manufacturing to Equipment Rental." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-263156.
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The rise of the sharing economy is forcing industries to move from traditional take-make-waste economy towards circular ones (Schuttelaar & Partners, 2019). Along with the increasing influence of e-commerce, supply-chain collaboration and globalization has increased the pressure of warehouse operations and requires more efficient operations with the use of less resources thanever before (Frazelle, 2016). Lean is a concept that has gained attention as a means of doing morewith less, through reducing wastes and continuously improving, which has been successful within the manufacturing sector. The difficulties of translating this concept into non-repetitive environments has contributed to the low level of adoption within industries like construction. Where companies within construction equipment rental have an even greater challenge, dealing with circular product flows. Thus, making their warehousing operations inherently complex along with the large amounts of different products. The thesis has focused on analysing the warehouse operations flow of collective fall protectionproducts in the equipment rental industry, from customer order to customer return. This has been enabled by performing an adapted Value Stream Mapping method in a new setting for equipmentrental industries. Where Value Stream Mapping traditionally is applied in manufacturing to visually represents the actions that are required for a product to move through the production andinformation flows. The purpose of the study is to apply VSM beyond manufacturing and tosummarize the results in order to provide suggestions for improving the handling of non-serialized products within the equipment rental industry. A case company within the equipment rental industry has been used to meet the purpose of the study by testing and evaluating the proposed frame work. The findings have been followed up by performing a return handling study, conducted by equipment rental professionals, which has been subject to a statistical analysis. The findings from the VSM are used as a foundation for the return handling study, which serves as a means of verifying or dismissing them. These are then summarized in suggestions for improvements to the case company and suggestions for future actions. Among the findings are indications of longer return times for products that are not forewarned prior to returns, and increase processing rates for sorted returns. Furthermore three product types were more frequently requiring repairs, cleaning and scrapping compared to other products, suggesting that these requiremore time to process. The company is advised to work with standardizing processes for return handling throughout the organization within invoicing specifications and product storage. Suggestions for future research within the subject area is also presented.Den ökande utbredningen av delningsekonomi tvingar industrier att gå från traditionella linjära affärsmodeller mot cirkulära (Schuttelaar & Partners, 2019). Utöver denna förändring så ökar även trycket på lagerverksamheter som ett resultat av det ökande inflytandet av e-handel, Supply-Chainsamarbete och globalisering som kräver effektivare verksamheter med användning av mindre resurser än någonsin förut (Frazelle, 2016). Lean är ett koncept som har uppmärksammats som en filosofi för att hantera dessa förändringar, genom att åstadkomma mer med mindre resurser och därmed minska slöseri och att sträva efter ständiga förbättringar, vilket har varit framgångsrikt inom tillverkningssektorn. Svårigheterna med att översätta detta koncept till icke-repetitiva miljöer har bidragit till den begränsade appliceringen av lean inom industrier som byggnadskonstruktion. Där företag inom uthyrning av byggnadsmaskiner och utrustning har en ännu större utmaning, då deras verksamhet bygger på cirkulära produktflöden. Vilket orsakar komplex lagerhantering av många olika produkter i stora mängder. Avhandlingen har fokuserat på att analysera lagerflödet av kollektiva fallskyddsmedel i uthyrningsbranschen, från kundorder till kundreturer. Detta har möjliggjorts genom att utföra en anpassad värdeflödeskartläggning i ett nytt sammanhang, nämligen för företag inom uthyrning av byggnadsmaskiner och utrustning. Där värdeflödeskartläggning vanligtvis används inom tillverkning för att visuellt representera de aktiviteter som krävs för att en produkt ska kunna flytta genom produktions- och informationsflödena. Syftet med studien är att tillämpa värdeflödeskartläggning utanför tillverkningssektorn och att sammanfatta resultaten i form av förslag på förbättringar av hanteringen av icke-serienumrerade produkter inom uthyrningsbranschen. Ett samarbete med ett fallföretag inom uthyrningsindustrin har genomgåtts för att uppfylla syftet med studien. Tillsammans med fallföretaget har det föreslagna ramarbetet testats och utvärderats. Resultaten har följts upp genom att genomföra en returhanteringsstudie, som utförs av verksamma inom lager hanteringen för kollektiva fallskyddsmedel, studiens resultat har sedan varit föremål för en statistisk analys. Upptäckterna från värdeflödeskartläggningen användes som grund för returhanteringsstudien, som agerat medel för att verifiera eller avfärda dem. Dessa har sedan sammanfattas i förslag till förbättringar till fallföretaget och förslag till framtida åtgärder. Bland resultaten finns indikationer på längre hanteringstider för returer som inte är förvarnade innan de blir återlämnade, samt minskade hanteringstider för sorterade returer. Dessutom krävde tre produkttyper ofta reparationer, rengöring och skrotning jämfört med andra produkter, vilket tyder på att dessa produkter är mer tidskrävande vid returer. Företaget rekommenderas att arbeta med standardiseringsprocesser för returhantering i hela organisationen, mer specifikt inom bestämmelser för fakturering och produktlagring. Förslag till framtida forskning inom ämnesområdet presenteras även.
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Wu, B. "An investigation into the operation of an Order-Handling-Manufacturing System." Thesis, Brunel University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384134.
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Boparai, Ramanpreet. "Integration of operation allocation and material handling in the design of flexible manufacturing systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ62188.pdf.
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Mercer, Robert M. "Attitudes and perceptions of instructors operating marine simulator courses." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/MQ36155.pdf.
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Hershberger, William K. "Improved questionnaire data handling and automated analysis capabilities for the MV-22 operational evaluation." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1999. http://handle.dtic.mil/100.2/ADA370796.
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Thesis (M.S. in Operations Research) Naval Postgraduate School, September 1999."September 1999". Thesis advisor(s): Lyn R, Whitaker. Includes bibliographical references (p. 95-96). Also available online.
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Saptari, Adi. "PC computer based algorithm for the selection of material handling equipment for a distribution warehouse based on least annual cost and operating parameters." Ohio : Ohio University, 1990. http://www.ohiolink.edu/etd/view.cgi?ohiou1183473503.
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Paulo, Jorge. "A mathematical model of operation allocation and materials handling system selection problems in a flexible manufacturing system." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0015/MQ52629.pdf.
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Dolley-Ryneveld, Mieshkah. "The effect of outsourcing a South African automotive company's material handling activities on its operational performance." Thesis, Nelson Mandela Metropolitan University, 2014. http://hdl.handle.net/10948/d1021202.
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Outsourcing has become a popular trend in the last two decades and has been applied in both non-essential and critical business functions. It has been viewed as a vital source of competitive advantage and is expected to remain an important component in future business strategies. Over the past few years, the outsourcing of logistics functions in particular has shown strong growth. Thus, an abundance of research on the outsourcing of logistics is available. However, there has been little research on the outsourcing of material handling activities as a sub-component of logistics, nor its effect on a company’s operational performance. The purpose of this treatise is to determine the effects of outsourcing a South African automotive company’s material handling activities on its operational performance. It further aims to compare the company’s expected outcomes for outsourcing with actual outcomes. In addition, the factors which contributed positively and negatively to the operation of the outsourced material handling activities at the company, are established. The automotive company in this study is situated in Port Elizabeth, but due to confidentiality reasons the name of the company is not mentioned in the study. The study consists of a literature review on the background of outsourcing, outsourcing theories, outsourcing trends, important outsourcing considerations and gaps in outsourcing research. Primary data, collected through the use of a questionnaire to determine the effects outsourcing has on the company’s operational performance, is collected, reported and analysed in the study. The performance criteria used to determine these effects are: cost; delivery speed and reliability; flexibility; quality; the outsourcing relationship and the management of the outsourcing relationship. The study results reveal that the operational performance of the company remained the same after outsourcing.
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Beque, Luciéli Tolfo. "Avaliação dos requisitos para teste de um sistema operacional embarcado." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/17799.
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A sociedade está cada vez mais dependente de sistemas embarcados, sendo que na grande maioria das vezes eles operam de maneira invisível aos seus usuários. Essa dependência torna esses usuários vulneráveis a riscos, devido às falhas que podem ocorrer. Essas falhas podem provocar perdas de vidas ou sérios danos materiais e financeiros. Devido a estes fatos, a qualidade destes produtos torna-se um ponto essencial para se ter um sistema estável, livre de erros e com todas as suas funcionalidades sendo executadas. De encontro a isso, a etapa de teste apresenta-se como indispensável e de relevada importância para a obtenção de um produto com uma boa qualidade. Devido ao alto custo de produção e energia gasto com testes, surge a necessidade de novos estudos, sobre diversificados métodos, para se testar um sistema embarcado. Neste contexto, este trabalho tem como objetivo apresentar os estudos iniciais do teste de um Sistema Operacional Embarcado (SOE), através de um estudo de caso focado na rotina de tratamento de exceção do eCos (Embedded Configurable Operating System), pois ela apresenta uma forte interação entre software e hardware, sendo que esta interação é um dos principais desafios encontrados no teste de um software embarcado. Com isso, este trabalho pretende dar o passo inicial para pesquisas relacionadas aos testes de um Sistema Operacional Embarcado. Após a análise dos experimentos, pôde-se notar que a principal característica do Sistema Operacional Embarcado eCos, a configurabilidade, é um ponto de dificuldade extra para a realização dos testes, pois exige um estudo detalhado do código do SOE, o qual é totalmente genérico, antes do planejamento dos testes, podendo ser gasto muito tempo nessa atividade. Outro ponto é que o teste torna-se totalmente dependente do hardware. Entretanto, os resultados experimentais apresentados para o estudo de caso do presente trabalho foram satisfatórios.Society is increasingly dependent on embedded systems, which in most cases operate in an invisible manner to its users. This dependence makes the user vulnerable to risks due to failures that may occur. These failures can cause loss of lives or serious property and financial damage. Because of these facts, the quality of these products becomes a key point to have a stable system, free of errors and with all the features running. This testing is of essential importance to obtain a product with good quality. Due to the high cost of production and energy spent on tests, there is a need for further studies on different methods, to test an embedded system. In this context, this work aims at presenting the initial studies as the testing of the Embedded Operating System. The case study was focused on the exception handling routine of the eCos (Embedded Configurable Operating System), because it has a strong interaction between software and hardware, and this interaction is one of the main challenges encountered in testing embedded software. Therefore, this work aims at taking the first steps towards research related to testing an Embedded Operating System. After analyzing the experiments, it was noted that the main feature of the Embedded Operating System, eCos, the configurability, is an extra point of difficulty for the tests. It requires a detailed study of the code eCos, which is completely general, before the planning of tests, and could be spent much time in this activity. Another point is that the test becomes totally dependent on hardware. However, the experimental results presented for the case study of this study showed satisfactory.
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Corwin, Matthew L. "A documentation and analysis of the physical, operating, and business environments for small-tree handling and harvesting." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/94498.
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Study objectives were 1) to identify successful mechanized thinning and prelogging systems currently operating in the South, 2) to document system characteristics contributing to their success, and 3) to determine which factors affect levels of residual stand damage from thinning operations. The first objective was accomplished by a South-wide industry survey. The latter two objectives were realized through in-depth field studies of selected systems.
The survey indicated three system types used on small-tree operations. Feller-buncher/grapple skidder/hydraulic loader systems comprised the majority of operations described. No predictable relationships between system type and tree size were apparent, so examples of the most common type were chosen for detailed study.
Three thinning and three prelogging systems were selected, covering a range of ownership patterns and physiographic regions. Information was obtained pertaining to each system's application; crew organization and background; equipment spread and descriptions; performance; and special considerations provided by landowners or timber buyers. Residual stand damage cruises were conducted at each thinning operation's job site.
Case-by-case analyses and comparisons between systems based on economic and productivity criteria resulted in a number of recommendations. These suggestions represented system characteristics seen as keys to the success of the operations studied. The recommendations focused on desirable contractor and crew characteristics, equipment selection decisions, job layout, minimization of residual stand damage, and methods of landowner/timber buyer support for small-tree operations.M.S.
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Swart, Marinda. "A Scheduling model for a coal handling facility [electronic resource] /." Diss., Pretoria : [s.n.], 2004. http://hdl.handle.net/2263/25388.
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The objective of this project is to develop an operational scheduling model for Sasol Mining’s coal handling facility, Sasol Coal Supply (referred to as SCS), to optimise daily operations. In this document, the specific scheduling problem at SCS is presented and solved using Mixed Integer Non-Linear Programming (MINLP) continuous time representation techniques. The most recent MINLP scheduling techniques are presented and applied to an example problem. The assumption is made that the results from the example problem will display trends which will apply to the SCS scheduling problem as well. Based on this assumption, the unit-specific event based continuous time formulation is chosen to apply to the SCS scheduling problem. The detail mathematical formulation of the SCS scheduling problem, based on the chosen technique, is discussed and the necessary changes presented to customise the formulation for the SCS situation. The results presented show that the first phase model does not solve within 72 hours. A solution time of more than three days is not acceptable for an operational scheduling model in a dynamic system like SCS. Various improvement approaches are applied during the second phase of the model development. Special Ordered Sets of Type 1 (SOS1) variables are successfully applied in the model to reduce the amount of binary variables. The time and duration constraints are restructured to simplify the structure of the model. A specific linearization and solution technique is applied to the non-linear equations to ensure reduced model solution times and reliable results. The improved model for one period solves to optimality within two minutes. This dramatic improvement ensures that the model will be used operationally at SCS to optimise daily operations. The scheduling model is currently being implemented at SCS. Examples of the input variables and output results are presented. It is concluded that the unit-specific event based MINLP continuous time formulation method, as presented in the literature, is not robust enough to be applied to an operational industrial-sized scheduling problem such as the SCS problem. Customised modifications to the formulation are necessary to ensure that the model solves in a time acceptable for operational use. However, it is proved that Mixed Integer Non-linear Programming (MINLP) can successfully be applied to optimise the scheduling of an industrial-sized plant such as SCS. Although more research is required to derive robust formulation techniques, the principle of using mathematical methods to optimise operational scheduling in industry can dramatically impact the way plants are operated. The optimisation of daily schedules at SCS by applying the MINLP continuous time scheduling technique, has made a significant contribution to the coal handling industry. Finally, it can be concluded that the SCS scheduling problem was successfully modelled and the operational scheduling model will add significant value to the Sasol Group.Dissertation (MEng (Industrial Engineering))--University of Pretoria, 2006.
Industrial and Systems Engineering
unrestricted
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Ho, John Kin Lim. "Some object-oriented design and software control methods of a flexible material handling system, operating in a CIM environment." Thesis, University of East London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282914.
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Saada, Hajer. "Exploiting Model Transformation Examples for Easy Model Transformation Handling (Learning and Recovery)." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20223/document.
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L'Ingénierie Dirigée par les Modèles (IDM) est un domaine de recherche en pleine émergence qui considère les modèles comme des éléments de base. Chaque modèle est conforme à un autre modèle, appelé son méta-modèle, qui définit sa syntaxe abstraite et ses concepts. Dans un processus IDM, différents types de modèles sont manipulés par des transformations de modèles. Une transformation génère un modèle dans un langage cible à partir d'un modèle dans un langage source. Pour concevoir une transformation, les développeurs doivent avoir une bonne connaissance des méta-modèles concernés ainsi que des langages de transformation, ce qui rend cette tâche difficile. Dans cette thèse, nous proposons d'assister l'écriture des transformations et plus généralement de comprendre comment une transformation opère. Nous adhérons à l'approche de transformation de modèles par l'exemple qui propose de créer une transformation de modèles à partir d'exemples de transformation. Cela permet d'utiliser la syntaxe concrète définie pour les méta-modèles, et cela évite donc de requérir que les développeurs aient une bonne maîtrise des méta-modèles utilisés. Dans ce contexte, nous proposons deux contributions. La première consiste à définir une méthode pour générer des règles de transformation opérationnelles à partir d'exemples. Nous nous basons sur une approche qui utilise l'Analyse Relationnelle de Concepts (ARC) comme technique d'apprentissage pour obtenir des patrons de transformation à partir d'un appariement de type 1-1 entre les modèles. Nous développons une technique pour extraire des règles de transformation opérationnelles à partir de ces patrons. Ensuite, nous utilisons le langage et le moteur de règles JESS pour exécuter ces règles. Nous étudions aussi comment mieux apprendre des règles de transformations à partir d'exemples, en utilisant séparément chaque exemple ou en réunissant tous les exemples. La deuxième contribution consiste à récupérer les traces de transformation à partir d'exemples de transformation. Ces traces peuvent être utilisées par exemple pour localiser des erreurs durant l'exécution des programmes de transformation ou vérifier la couverture de tous les modèles d'entrée par une transformation. Dans notre contexte, nous supposons que ces traces vont servir pour un futur apprentissage des règles de transformation. Nous traitons tout d'abord le problème de récupération des traces avec des exemples provenant d'un programme de transformation. Nous proposons une approche basée sur une méta-heuristique multi-objectifs pour générer des traces sous forme d'appariement de type n-m entre des éléments de modèles. La fonction objectif s'appuie sur une similarité lexicale et structurelle entre ces éléments. Une extension de cette méthode est proposée pour traiter le problème plus général de l'appariement entre modèlesModel Driven Engineering (MDE) considers models as first class artifacts. Each model conforms to another model, called its metamodel which defines its abstract syntax and its semantics.Various kinds of models are handled successively in an MDE development cycle. They are manipulated using, among others, programs called model transformations. A transformation takes as input a model in a source language and produces a model in a target language. The developers of a transformation must have a strong knowledge about the source and target metamodels which are involved and about the model transformation language. This makes the writing of the model transformation difficult.In this thesis, we address the problem of assisting the writing of a model transformation and more generally of understanding how a transformation operates.We adhere to the Model Transformation By example (MTBE) approach, which proposes to create a model transformation using examples of transformation. MTBE allows us to use the concrete syntaxes defined for the metamodels. Hence, the developers do not need in-depth knowledge about the metamodels. In this context, our thesis proposes two contributions.As a first contribution, we define a method to generate operational transformation rules from transformation examples. We extend a previous approach which uses Relational Concept Analysis as a learning technique for obtaining transformation patterns from 1-1 mapping between models. We develop a technique for extracting relevant transformation rules from these transformation patterns and we use JESS language and engine to make the rules executable. We also study how we better learn transformation rules from examples, using transformation examples separately or by gathering all the examples.The second contribution consists in recovering transformation traces from transformation examples. This trace recovery is useful for several purposes as locating bugs during the execution of transformation programs, or checking the coverage of all input models by a transformation. In our context, we expect also that this trace will provide data for a future model transformation learning technique. We first address the trace recovery problem with examples coming from a transformation program. We propose an approach, based on a multi-objective meta-heuristic, to generate the textit{many-to-many} mapping between model constructs which correspond to a trace. The fitness functions rely on the lexical and structure similarity between the constructs. We also refine the approach to apply it to the more general problem of model matching
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Attravanam, Siddarth Kashyap. "Identifying Operating Conditions of Tires During Highway Driving Maneuvers." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1534456018582412.
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Vogt, John Joseph. "The design principles and success factors for the operation of cross dock facilities in grocery and retail supply chains." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/50133.
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Dissertation (PhD)--Stellenbosch, 2004.ENGLISH ABSTRACT: The dissertation reflects the research done on the design principles and success factors for the operation of cross dock facilities in grocery and retail supply chains. The cross dock is a particular facility in the supply chain where goods are received from suppliers, sorted without storage of the goods, and then efficiently moved to downstream customers. Cross docks are not a new operation. However, the use in high volume grocery and retail operational capabilities is poorly understood and is not uniquely defined. The problem is that cross docks are often seen as extensions of warehouses. The same personnel, systems and processes are applied and the efficiency potential of the cross dock is not achieved. Warehouses are orientated towards storing the full range of product and allowing the pick to be done from this storage buffer to provide any or all of these products to a customer. Cross docks will only handle products that are used in larger quantities and that are sent to most, if not all, the customers. The cross dock is therefore distinct and very different from the traditional warehouse. The published research tends to focus on the technical aspects of the cross dock layout. This research is primarily in the scheduling of the trucks into the yard of the facility; the allocation of trucks to specific doors of the facility; and the allocation of doors to receiving and despatch functions within the facility. Very little information or research reflects the design principles and success factors for the cross dock and its supply chain. The only classification of the cross dock in the literature is whether the barcode is added to the item before or after receipt at the cross dock. For this research work a literature survey was conducted and five major operations were reviewed, in South Africa and the USA. The research empirically drew logical conclusions, which were tested in the operations and found to be correct. This allowed the design principles and success factors to be determined for a successful cross dock. The research extends the knowledge of the cross dock operation and design: - • A new classification for the feasible types of cross docks in the supply chain was developed. Three factors are shown to be of primary importance: - o Where in the supply chain the identification of specific items for a customer is done; o Where the sort is done for the items to be delivered to a customer; and o Whether the supplier is providing one product or multiple products to the sort. From these three factors, eight potential classifications could be defined. However, only three practical types of cross dock can be determined from these eight alternatives. These are named in this research as Cross Dock Managed Load (CML); Joint Managed Load (JML); and the Supplier Managed Load (SML). The cross dock is far more effective than the warehouse when the total work (excluding inventory) is considered. The earlier in the supply chain the product is identified for the use of the entire downstream supply chain, the more effective will be the total supply chain. Thus the greatest supply chain effectiveness possible is with the SML, then the JML and finally the CML. • The operation of a cross dock is very similar to a continuous manufacturing process. There is no buffer of stock to decouple the inbound and outbound processes, and the operation takes place in a restricted area. However, in the retail chain, the workload alters with different orders and different days. Daily load differences vary by as much as 90%. This results in vastly different workloads and variations of throughput. This is similar to a batch operation with highly variable workloads between batches. The literature recommends the use of Just in Time (JIT) practice for cross docks. This is inappropriate as its primary requirements are continuous full volume operation and continuous small improvements to achieve a balanced operation. The most appropriate method of process improvement is the Theory of Constraints (TO C) and not JlT. • The management must have a detailed, disciplined approach. This implies standardised methods of operation, and a high degree of training. Equally there is the requirement for a special type of personnel to operate the cross dock. These operating personnel must be able to operate with precision (i.e. very low error rates) and be able to maintain this capability for continuous periods. • The systems required for a successful operation must include the capabilities of Yard Management, WMS for cross docking, Order Management with Advanced Shipping Notice (ASN) capability and Track and Trace across the supply chain. The items need to be identified by a barcode. The information required on the barcode will be determined by. the information systems capability of the least advanced service provider in the supply chain. If this service provider can receive and transmit all the data required for the supply chain from and to the other members, then the barcode need only be an identification number of the specific item. The data pertaining to the items is then passed from system to system in the supply chain. If data movement is not possible between all the parties in the entire supply chain, then the barcode must contain the information that will identify the item, the origin and the final delivery destination. If the items are delivered as part of a consignment, a further quantum of information is required to identify the total number of items in the consignment and the specific item within the consignment. • The research shows that the overall capability of the cross dock or its maximum capacity is the combination of the capability of the personnel and the cross dock design. Restrictions on either the personnel capability or the design of the cross dock, or both, severely reduces the effectiveness of the cross dock. • The previous research on the sequence of allocation of trucks to specific doors within the cross dock can be enhanced with a new sequencing method. The new method allocates the transport, in sequence of arrival, to the open door that either numrruses the walk distance in the facility; or maximises the completion of the consignments in order to minimise the area required to build the consignments; or a combination of both. The choice of these will be determined by the constraints imposed by the design of the building. This is an important extension as this ties the supply chain into the cross dock operation, rather than looking at the cross dock in isolation as has been done in this previous research. • The factors that influence the design of a cross dock as to its size, shape, number of doors, and the specifically required additional areas, is defined in detail. The principles of these factors and their inter-relationships and dependencies are used in a detailed design for a cross dock. The detailed design process is set out from data analysis through to the actual size calculations and layouts. Measurements of walk distance and sort movement are used to determine the most effective design. The design is shown to be considerably more effective than the older designs. This work has significantly extended the research on the design principles and success factors for implementation of cross docks in retail supply chains. The research derives a unique new classification for cross docks. An improvement is made to existing research on the allocation of the transport to particular doors in the cross dock. The operation, management and personnel are shown to require specific characteristics. The information systems required for effective cross docks is determined and defined. The identification of the individual items by barcode and the information required within the barcode depending on the information sophistication of the service providers in the supply chain is defined. A detail process to design a cross dock is evolved, with the full knowledge of the factors that must be considered and their interrelationships. Measurements to determine the effectiveness of the design are used to choose the most appropriate design. All these are then synthesised into a new design, which is far more effective than any of the other designs researched. The design process will produce a very effective cross dock as has been demonstrated with a new facility.
AFRIKAANSE OPSOMMING: geen opsomming
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Bradley, Alexandre. "A comparison of whole life cycle costs of robotic, semi-automated, and manual build airport baggage handling systems." Thesis, Cranfield University, 2013. http://dspace.lib.cranfield.ac.uk/handle/1826/9311.
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This thesis proposes that a baggage handling system (BHS) environment can be defined and coupled to a whole life cycle cost (WLCC NPV) model. The results from specific experiments using the model can be used as the basis by which to commercially compare BHS flight build types of any capacity, and BHS geographical location.
The model examined the three flight build types(i): Fully automatic build2; (ii) Semi-automatic build, and(iii); Manual build.
The model has the ability to calculate a bag flow busy hour rate, and to replicate the baggage flow characteristics observed within real BHS operations. Whole life cycle costs (WLCC NPV) results are produced, and these form the basis by which the comparison of BHS types is made. An overall WLCC NPV scatter diagram was produced, which is a summation of each of the test sensitivities. The assumptions and limitations of the analysis are provided. It is proposed that the results, conclusions and recommendations shall be of value to airports, airlines, and design consultants.
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Heinig, Andreas [Verfasser], Peter [Akademischer Betreuer] Marwedel, and Hermann [Gutachter] Härtig. "Flexible error handling for embedded real time systems : Operating system and run time aspects / Andreas Heinig. Betreuer: Peter Marwedel. Gutachter: Hermann Härtig." Dortmund : Universitätsbibliothek Dortmund, 2015. http://d-nb.info/1108290477/34.
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Henriksen, Dag. "Operation Allied Force : a product of military theory or political pragmatism? : an examination of the role of air power in handling the Kosovo crisis, 1998-99." Thesis, University of Glasgow, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.439094.
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Bantel, Carlos Adolfo [UNESP]. "Análise de extração de madeira de eucalipto com forwarder em floresta de primeira e segunda rotação." Universidade Estadual Paulista (UNESP), 2006. http://hdl.handle.net/11449/90570.
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bantel_ca_me_botfca.pdf: 1764312 bytes, checksum: a4da2be782691f272a138472ddc521ba (MD5)Universidade Estadual Paulista (UNESP)
Foram avaliados três subsistemas de extração de madeira em floresta de Eucalyptus spp, de um sistema colheita florestal de madeira curta, com toretes de 6 metros de comprimento. Subsistema 1: floresta de primeira rotação com pilhas de madeira formadas sobre travesseiros e dispostas em ambos os lados do ramal de extração; Subsistema 2: floresta de primeira rotação com pilhas de madeira formadas sobre travesseiros e dispostas em uma só fileira de pilhas de madeira por ramal de extração; Subsistema 3: floresta de segunda rotação, com as pilhas de madeira dispostas diretamente sobre o solo, ou seja, sem o travesseiro, em ambos os lados do ramal de extração. As pilhas de toretes foram extraídas utilizando a máquina forwarder Valmet 890.2. Os tempos de carregamento, descarregamento, deslocamento sem carga, deslocamento com carga e o tempo total do ciclo de extração da madeira foram menores no subsistema 2. O subsistema 2 apresentou maior rendimento operacional e maior economia no consumo de óleo Diesel por metro cúbico de madeira extraída em comparação com os demais subsistemas. O aumento do tamanho das pilhas e a concentração da madeira em uma única fileira de pilhas por ramal resultaram em maior rendimento operacional na extração com o forwarder.
Three forest handling and harvesting subsystems in an area of Eucalyptus spp. were analysed, in a cut-to-length system with short wood logs of 6 meters length. Subsystem 1: first rotation forest with wood logs piling up formed over platform and disposed along both sides of the extraction branches; Subsystem 2: first rotation forest with wood logs piling up formed over platform and disposed only along one side of the extraction branches; Subsystem 3: second rotation forest, with wood logs disposed directly on the floor, without any platform, along both sides of the extraction branches. The short wood log piles were extracted using a Valmet 890.2 forwarder. Times of loading and unloading activities, loaded and unloaded movements and total extraction time were smaller on subsystem 2. The subsystem 2 also permitted upper operational yield and bigger savings on Diesel oil consumption per cubic meter of extracted wood when compared to the other subsystems. The adoption of bigger wood piles concentrated along only one side of the extraction branch also resulted in an increasing on operational yield with the forwarder.
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Hansson, Tengberg Henrik, and Andreas Adlerborn. "Design of an Assembly System at AERCRETE INDUSTRIES." Thesis, Jönköping University, Jönköping University, JTH, Industrial Engineering and Management, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-10742.
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The forming of an assembly system is a complex task, which should be considered as never ending. In order to successfully plan and implement an assembly system it is of vital importance that the obstacles and preconditions that have an impact on the system are identified and evaluated. This together with the necessary support activities and the attributes of the product to be assembled constitutes the starting point for the forming of the assembly system.
The aim of this thesis is to link the theoretical findings with the issues stated above, and through this explain a best practice approach when forming the assembly system. The theoretical work aims at describing the nature and activities within assembly and manufacturing systems and explains these in three different levels of strategies divided into Manufacturing strategies, Layout, material flow and design strategies and finally Logistic, material handling and quality strategies. Then the obstacles and preconditions found are discussed and evaluated which set the basis for the forming of the assembly system and by linking these with the relevant theory, conceptual design proposals for the assembly system and the Logistic support system are formed.
These are then evaluated and finally a proposal for the detailed layout of the assembly system is given. This proposal is then to be used as a guideline for the company Aercrete when forming their assembly system.
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Johnsson, Frida. "The Interface Between Social Entrepreneurship and Governance : A qualitative case study including eight social entrepreneurs operating within regions of India." Thesis, Karlstads universitet, Fakulteten för samhälls- och livsvetenskaper, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-15772.
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Instead of asking why governments in developing countries are not doing what (Western) governments can (or at least in the past could) be expected to do we may need to ask the questions of how governance empirically is provided and by whom. While the involvement of non-public actors within processes of governance is far from new, the increased interest in social entrepreneurship, both as a practice and scholarly, is. The aim of the present study has been to explore and describe the interface between social entrepreneurship and governance within regions of India. The study has been inspired by a case study research design, including a set of qualitative methods: A generated sampling frame has facilitated the selection of analytical units; The collection of data has been conducted by semi-structured interviews; The data has been analyzed by a comparative approach. Based on a broad analytical governance framework provided by Kooiman et al (2005a) three research questions have guided the analysis: 1. What arguments are provided by the examined social entrepreneurs for their intentional action? 2. May action taken by the social entrepreneurs in this study be understood as an expression of hierarchical governance, self-governance and/or co-governance, and if so, how? 3. How may action taken by the social entrepreneurs in this study be related to first-order governance (day-to-day problem-solving and opportunity creation), second-order governance (institutions) and/or third-order governance (principles)? The result of the study reveals how the action taken by the studied social entrepreneurs interface with several aspects of governance. The arguments presented for intentional action, related to the provision of collective goods to marginalized citizens, may be understood in relation to two themes: perceived government failures (as well as failures by traditional NGOs) and the self-perception of being “value-driven”. The data reveals strands of hierarchical-, self- and co-governance. The studied social entrepreneurs are understood to contribute to first-order governance. Their action is further suggested to be challenging existing institutions in the long-run and perhaps also dominating principles guiding the “governance of governance”.
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Margono, Buntoro Sandhy. "Optimierung von Bewegungsabläufen mit schwingungsfreien Endpositionen zur Verkürzung der Arbeitszyklen von Container-Schnellumschlag-Anlagen / Optimization of Vibration-free Positioning for Reducing the Operating Cycles of Container Handling Cranes." Gerhard-Mercator-Universitaet Duisburg, 2004. http://www.ub.uni-duisburg.de/ETD-db/theses/available/duett-10262004-094516/.
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Modern cranes built for the handling of containers should work efficiently concerning the energy consumption, and should also decrease the time of the handling process by using high trolley velocities. On the other hand these cranes should be able to reach the target positions precisely and without residual vibrations. Especially, the trolley accelerations needed to shorten the operating cycles excite the load as well as the crane structure, leading to vibrations, which should be reduced by suitable control methods. This Dissertation develops energy and time optimal control methods on the basis of suitable models of container handling systems for transferring a load unit. Based on the Pontryagin maximum principle the optimal control methods are determined. Their disadvantage, however, is that they react very sensitively on the inaccuracies of the system parameters. Especially, the data of the containers is very often not known exactly. That is why the input shaping method is taken as an alternative to the optimal solution based on the maximum principle. The corresponding suboptimal solutions are very robust concerning the inaccuracies of the system parameters and the initial conditions. The mechanical modelling takes into account the pendulum like motion of the load as well as the vibration of the crane structure.
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Bantel, Carlos Adolfo 1945. "Análise de extração de madeira de eucalipto com forwarder em floresta de primeira e segunda rotação /." Botucatu, [s.n.], 2006. http://hdl.handle.net/11449/90570.
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Resumo: Foram avaliados três subsistemas de extração de madeira em floresta de Eucalyptus spp, de um sistema colheita florestal de madeira curta, com toretes de 6 metros de comprimento. Subsistema 1: floresta de primeira rotação com pilhas de madeira formadas sobre travesseiros e dispostas em ambos os lados do ramal de extração; Subsistema 2: floresta de primeira rotação com pilhas de madeira formadas sobre travesseiros e dispostas em uma só fileira de pilhas de madeira por ramal de extração; Subsistema 3: floresta de segunda rotação, com as pilhas de madeira dispostas diretamente sobre o solo, ou seja, sem o travesseiro, em ambos os lados do ramal de extração. As pilhas de toretes foram extraídas utilizando a máquina forwarder Valmet 890.2. Os tempos de carregamento, descarregamento, deslocamento sem carga, deslocamento com carga e o tempo total do ciclo de extração da madeira foram menores no subsistema 2. O subsistema 2 apresentou maior rendimento operacional e maior economia no consumo de óleo Diesel por metro cúbico de madeira extraída em comparação com os demais subsistemas. O aumento do tamanho das pilhas e a concentração da madeira em uma única fileira de pilhas por ramal resultaram em maior rendimento operacional na extração com o forwarder.Abstract: Three forest handling and harvesting subsystems in an area of Eucalyptus spp. were analysed, in a cut-to-length system with short wood logs of 6 meters length. Subsystem 1: first rotation forest with wood logs piling up formed over platform and disposed along both sides of the extraction branches; Subsystem 2: first rotation forest with wood logs piling up formed over platform and disposed only along one side of the extraction branches; Subsystem 3: second rotation forest, with wood logs disposed directly on the floor, without any platform, along both sides of the extraction branches. The short wood log piles were extracted using a Valmet 890.2 forwarder. Times of loading and unloading activities, loaded and unloaded movements and total extraction time were smaller on subsystem 2. The subsystem 2 also permitted upper operational yield and bigger savings on Diesel oil consumption per cubic meter of extracted wood when compared to the other subsystems. The adoption of bigger wood piles concentrated along only one side of the extraction branch also resulted in an increasing on operational yield with the forwarder.
Orientador: Paulo Torres Fenner
Coorientador: Elias Taylor Durgante Severo
Banca: Kleber Pereira Lanças
Banca: Jair Rosas da Silva
Mestre
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Lindroos, Ola. "Efficiency and safety in self-employed family forestry /." Umeå : Dept. of Forest Resource Management and Geomatics, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/2006110.pdf.
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Coelho, Robson Jacinto. "Modelo de simulação operacional do manuseio de matérias-primas de uma usina siderúrgica integrada." Universidade Federal da Paraíba, 2011. http://tede.biblioteca.ufpb.br:8080/handle/tede/5196.
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The main goal of this dissertation is to design and implementation of an Operational Simulation Model (OSM) of the handling of raw material in an Integrated Steelmaking Plant, considering operations of receiving, unloading, stocking, handling and supplying the different raw materials related to the production process with an operational perspective. The aim of this focus is to help in the decision making of the team controlling the ore inventory. The construction of this computer model was based on the methodological framework developed by Coelho, which passed through problem formulation, planning and elaboration of a detailed specification of the model. The OSM showed that most of the valid concepts for simulations with a strategic focus do not present relevance from an operational point of view. The advantage of the OSM is the fact that it is not random or stochastic, but deterministic. The methodology allowed the model elaboration with a minimum effort and great consistency. The results of scenarios with scheduled equipment stops have shown the simulator s flexibility, with previous identification of bottlenecks and allowed the decision making of corrective actions for avoid them on real situations. The filling of the stockyard map using results of consistent scenarios was a great advance in order to automate this activity. The correct behaviour of the simulator allowed the raw material yard team to consider the well succeeded study.
O objetivo principal desta dissertação é construir um modelo de simulação operacional do manuseio de matérias-primas de uma usina siderúrgica integrada, contemplando as operações de recebimento, descarga, estocagem, manuseio e abastecimento das diversas matérias-primas pertinentes ao processo produtivo, com foco operacional, visando auxiliar a tomada de decisões operacionais da equipe que controla o pátio. A construção desse modelo computacional se baseou na estrutura metodológica desenvolvida por Coelho, que passou pela formulação do problema, planejamento do estudo e pela elaboração de uma especificação detalhada do modelo. O modelo de simulação operacional revelou que grande parte dos conceitos válidos para simulações com foco estratégico não representa tanta relevância sob o ponto de vista operacional. Mas a vantagem do modelo de simulação operacional é a ausência de aleatoriedade, não é estocástico, mas sim determinístico. A metodologia inédita, utilizada para desenvolvimento do modelo do pátio de matérias-primas, permitiu a elaboração do modelo com o mínimo de retrabalho e com grande consistência. Os resultados dos cenários, com paradas programadas dos equipamentos, mostraram a flexibilidade do simulador, permitindo a identificação prévia de gargalos e possibilitando a tomada de ações corretivas para evitá-los nas situações reais. O preenchimento do mapa do pátio, a partir de resultados de cenários consistentes, foi um grande avanço, no sentido de automatizar esta atividade. O comportamento correto do simulador permitiu que a equipe do pátio de matérias-primas considerasse o estudo muito bem sucedido.
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Reis, Neuto Gonçalves dos. "Viabilidade de operação do duplo semi-reboque de cinco eixos no Brasil." Universidade de São Paulo, 1996. http://www.teses.usp.br/teses/disponiveis/18/18137/tde-13042018-150847/.
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Este trabalho investiga a viabilidade de se implantar no Brasil o veículo combinado de cinco eixos constituído de um cavalo mecânico mais dois semi-reboques acoplados por um dolly intermediário e chamado aqui de Duplo Semi-Reboque (DSR). Essa investigação inclui tanto aspectos econômicos (custos operacionais) quanto operacionais (densidade das cargas, rotas, demandas, veículos utilizados), tecnológicos (veículos e implementes), legais (pesos e dimensões), de segurança (estabilidade, dirigibilidade, risco de acidentes e impacto sobre o tráfego de outros veículos) e de inter-relação com a infra-estrutura rodoviária. Como a configuração analisada é largamente utilizada nos Estados Unidos, com o nome de twin trailer truck, faz-se uma ampla revisão da literatura norte-americana. O estudo apresenta as características técnicas do twin, levanta a legislação norte-americana de carga por eixo e mostra como a busca de produtividade e o aumento da carga volumosa conduziram à necessidade de veículos mais longos. Compila artigos sobre a estabilidade, a dirigibilidade e o impacto sobre o tráfego dos veículos longos combinados. Sintetiza pesquisas comparando taxas de acidentes dos veículos combinados com os caminhões convencionais. A maioria desses estudos conduz à conclusão de que, embora os twins possam degradar ligeiramente as condições de segurança de tráfego e aumentar o desgaste elos pavimentos, essa degradação é compensada pela redução do número de viagens e do custo do transporte. Conclui-se que o veículo seria economicamente viável no Brasil para substituir caminhões trucados em rotas de demanda limitada, e que poderia também economizar custos na substituição a veículos convencionais no transporte de cargas volumosas, sem provocar maiores impactos sobre a segurança operacional. Pesquisa com frotistas mostra que quase 50% das transportadoras de carga fracionada operam cargas de densidade compatível com o DSR. A introdução do veículo, no entanto, enfrenta fortes obstáculos legais e exigiria mudança profunda na legislação dos veículos combinados longos.This paper investigates the feasibility of introducing the American twin trailer truck in the Brazilian road transport network. The twin is a five axle configuration with one tractor and two semi-trailers, coupled by an intermediate dolly. The investigation embraces not only economic questions (operational costs), but also operational aspects (freight density and volume, vehicle choice, line extension etc), technological questions (vehicles, trailers and dollies), weights and dimensions legislation, safety impacts (handling and stability, impact of traffic operations and statistic studies of accident rates) and the twin\'s interface with the highway facilities. The American and Canadian studies about twins are reviewed. The paper presents the technical characteristics of twins, the american weights and dimensions legislation and shows how the claim for more productivity in the transport industry and the low density freight growth have induced the use of longer combinations. The study compiles the main results presented in the literature about handling, stability and the twin trailer impact on the highway traffic and analyzes statistics comparing doubles with semi-trailer accident rates. The literature review leads to the conclusion that, althrough the twins could degrade slightly the vehicle traffic safety performance and accelerate the pavement wear, this degradation is overwhelmed by the reduction of the number of vehicles on the roads and direct and indirect transportation costs. The introduction of the win trailer truck in Brazil could be advantageous in order to replace tandem trucks on low demand routes. The savings in terminal times and the higher capacitiy of this configuration would cut costs as compared to the straight truck, semi-trailer and truck-and-trailer configurations, without relevant deterioration of the operational safety. The results of a large sample with brazilian LTL companies show that almost 50% of them operate with a freight density that would be ideal for twins. The twin\'s introduction, however, faces strong legal impediments in some markets, and only would be feasible if deep changes in the Brazilian weight and dimension regulations would be undertaken.