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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
141

E-Grocery in Digital Age : ICA MAXI in Gävle

Kuang, Peiying, Ali, Mahmood January 2014 (has links)
Aim: The purpose of this study is to identify factors that can attract customers to buy online and help the grocers to improve their online grocery services to retain and obtain customers. Design/Methodology/Approach: A qualitative method was used, based on triangulation methodology including observation and interviews of manager and employees. Quantitative data was collected by handing out questionnaire to 204 potential customers and 30 existing customers. Findings: The study shows that product and service quality, time saving and convenience, web page layout, customers’ trust in grocers (service providers), store image and advertising are the important factors that customers consider when they decide to use online grocer service. E- grocers also need to consider these factors when they start online grocery service. Suggestions for Future Research: An extensive study with large population sample and co- operation from other companies can help to generalize the results. Future studies can be extended to include drive-in and shared reception box service method, and consider the cost for the customers in e-grocery sector.
142

Optimisation de la préparation de commandes dans les entrepôts de distribution / Order picking optimization in a distribution warehouse

Lenoble, Nicolas 23 October 2017 (has links)
La préparation de commandes est une activité primordiale dans les entrepôts de distribution (près de 60% des coûts opérationnels dans les entrepôts traditionnels). Un des moyens de réduire ces coûts est de collecter plusieurs commandes simultanément, plutôt qu’une par une ; cela permet d’éviter des déplacements inutiles des opérateurs dans le cas de collecte manuelle des produits, et de moins solliciter les machines, dans le cas de collecte automatisée. Nous considérons dans cette thèse des entrepôts de distribution où les produits sont stockés dans des machines appelées stockeurs automatisés composés de plateaux sur lesquels les produits sont stockés ; nous prenons en compte deux types de stockeurs : les VLMs et Carousels. Ces deux types de machines, en plein développement, se différencient par le temps nécessaire pour passer d’un plateau au plateau suivant à visiter (constant dans le cas d’un VLM, dépendant du nombre d’étages entre les 2 plateaux visités dans le cadre des carousels). L’objectif de la thèse est donc de développer des méthodes pour faire des regroupements de commandes en lots dans des entrepôts automatisés afin de collecter un ensemble donné de commandes le plus efficacement possible selon des critères que nous allons définir.Nous étudions tout d’abord un premier type de regroupement de commandes en lots, pour lequel chaque lot sera collecté entièrement (toutes les commandes composant le lot seront traitées) avant de passer au suivant. Nous parlerons simplement de batching. Nous évaluons le temps de préparation de commandes, dans le cas où l’opérateur effectue la collecte sur une ou sur plusieurs machines. L’intérêt d’utiliser plusieurs machines est de permettre la recherche de plateaux en temps masqué (le stockeur effectue un changement de plateaux pendant que l’opérateur est occupé à effectuer la collecte sur d’autres stockeurs). Cette évaluation du temps de préparation de commandes nous permet d’extraire un critère d’optimisation et d’établir des modèles d’optimisation exacts pour les VLMs puis les carousels. Ces modèles sont ensuite testés avec des données réelles d’entreprise, grâce au partenariat avec l’entreprise KLS Logistic, éditeur du WMS Gildas. Enfin, nous étendons la résolution aux méthodes approchées de type métaheuristiques, afin de garantir de bonnes solutions sous un temps de calcul raisonnable. Des résultats significatifs en termes de réduction du temps de préparation de commandes permettent de justifier l’intérêt de nos travaux.Nous étudions ensuite un deuxième type de regroupement, où un ensemble de commandes est collecté simultanément mais, contrairement au cas précédent, à chaque fois qu’une commande est terminée, elle est immédiatement remplacée. Nous parlerons ici de « Rolling batching ». Cette approche est classiquement utilisée dans les « Drive ». Nous nous focalisons sur le cas de collecte effectuée sur des carousels, système le plus utilisé dans les « Drive ». Nous développons un algorithme permettant le calcul du temps d’attente de l’opérateur. Une résolution approchée couplant l’utilisation d’heuristiques et d’une métaheuristique est proposée afin de résoudre efficacement le séquencement des commandes. Nous notons que des gains significatifs sont obtenus par l’utilisation de la méthode proposée. / The order picking is a critical activity in distribution warehouses (60% of the operational costs in traditional warehouses). One way to reduce these costs is to collect several orders simultaneously, rather than individually, to avoid unnecessary travels to the operators in the case of manual picking of the products, and less workload for the machines, in the case of automated picking. We consider, in this PhD, warehouses where products are stored in automated storage systems composed by trays on which products are stored. We consider two types of machines: VLMs and Carousels. These two types differ by the time required to move from a tray to the next one to visit (constant in the case of a VLM, depending on the number of trays between 2 consecutively visited trays for the carousels). We aim to develop order batching methods in automated warehouses to collect a set of orders efficiently, according to criteria that we will define.We study a first category of order batching, for which each batch will be entirely collected (all orders associated with a given batch will be collected) before moving to the next batch. We evaluate completion time, when the operator does the picking on one or several machines. The interest of using multiple machines is to search trays in masked time (the machine change trays while the operator is busy to collect on other machines). From this evaluation of the completion time, we extract an optimization criterion and establish optimization models for the VLMs then the carousels. These models are then tested with actual data, thanks to the partnership with the company KLS Logistic, editor of the WMS Gildas. Finally, we extend the resolution to metaheuristics, to ensure good solutions under reasonable computation time. Significant savings in terms of completion time reduction justifies the interest of our work.We then study the second category, where a set of orders is collected simultaneously, but unlike the previous case, whenever an order is collected, it is immediately replaced by a new one. We'll talk here about "Rolling batching”. This approach is typically used in the "Drive-in shops". We develop an algorithm for the computation of the waiting time of the operator. Resolution coupling heuristics and a metaheuristic is proposed in order to effectively resolve the order sequencing. Significant gains are achieved by the use of the proposed method.
143

Détection et estimation de pose d'instances d'objet rigide pour la manipulation robotisée / Detection and pose estimation of instances of a rigid object for robotic bin-picking

Brégier, Romain 11 June 2018 (has links)
La capacité à détecter des objets dans une scène et à estimer leur pose constitue un préalable essentiel à l'automatisation d'un grand nombre de tâches, qu'il s'agisse d'analyser automatiquement une situation, de proposer une expérience de réalité augmentée, ou encore de permettre à un robot d'interagir avec son environnement.Dans cette thèse, nous nous intéressons à cette problématique à travers le scénario du dévracage industriel, dans lequel il convient de détecter des instances d'un objet rigide au sein d'un vrac et d'estimer leur pose -- c'est-à-dire leur position et orientation -- à des fins de manipulation robotisée.Nous développons pour ce faire une méthode basée sur l'exploitation d'une image de profondeur, procédant par agrégation d'hypothèses générées par un ensemble d'estimateurs locaux au moyen d'une forêt de décision.La pose d'un objet rigide est usuellement modélisée sous forme d'une transformation rigide 6D dans la littérature. Cette représentation se révèle cependant inadéquate lorsqu'il s'agit de traiter des objets présentant des symétries, pourtant nombreux parmi les objets manufacturés.Afin de contourner ces difficultés, nous introduisons une formulation de la notion de pose compatible avec tout objet rigide physiquement admissible, et munissons l'espace des poses d'une distance quantifiant la longueur du plus petit déplacement entre deux poses. Ces notions fournissent un cadre théorique rigoureux à partir duquel nous développons des outils permettant de manipuler efficacement le concept de pose, et constituent le socle de notre approche du problème du dévracage.Les standards d'évaluation utilisés dans l'état de l'art souffrant de certaines limitations et n'étant que partiellement adaptés à notre contexte applicatif, nous proposons une méthodologie d'évaluation adaptée à des scènes présentant un nombre variable d'instances d'objet arbitraire, potentiellement occultées. Nous mettons celle-ci en œuvre sur des données synthétiques et réelles, et montrons la viabilité de la méthode proposée, compatible avec les problématiques de temps de cycle, de performance et de simplicité de mise en œuvre du dévracage industriel. / Visual object detection and estimation of their poses -- i.e. position and orientation for a rigid object -- is of utmost interest for automatic scene understanding.In this thesis, we address this topic through the bin-picking scenario, in which instances of a rigid object have to be automatically detected and localized in bulk, so as to be manipulated by a robot for various industrial tasks such as machine feeding, assembling, packing, etc.To this aim, we propose a novel method for object detection and pose estimation given an input depth image, based on the aggregation of local predictions through an Hough forest technique, that is suitable with industrial constraints of performance and ease of use.Overcoming limitations of existing approaches that assume objects not to have any proper symmetries, we develop a theoretical and practical framework enabling us to consider any physical rigid object, thanks to a novel definition of the notion of pose and an associated distance.This framework provides tools to deal with poses efficiently for operations such as pose averaging or neighborhood queries, and is based on rigorous mathematical developments.Evaluation benchmarks used in the literature are not very representative of our application scenario and suffer from some intrinsic limitations, therefore we formalize a methodology suited for scenes in which many object instances, partially occluded, in arbitrary poses may be considered. We apply this methodology on real and synthetic data, and demonstrate the soundness of our approach compared to the state of the art.
144

Využití dat z výnosového monitoru sklízecí mlátičky Claas Lexion pro diferencované hnojení základními prvky pomocí stroje Terra Gator 8103. / Data assimilation from the performance monitor picking threshing-machine CLAAS LEXION for the differential gear fertilization elements by the help of machinery Terra Gator 8103.

MEZERA, Tomáš January 2009 (has links)
Agriculture is the basic of the life cycle activities mankind and significant in a way work landscape. Picking threshing-machine equipment GPS to us offer high accurate data. This data with then further working odd exploited with for resulting fertilization basic nutriment. At the same time we shall completely worked with information on economy company. Record is then better economies odd largely smaller negative impact on environment.
145

Digitalisering av plockprocess : En fallstudie på Bilvårdsgrossisten / Digitalization of the picking process : A case study at Bilvårdsgrossisten

Rosvall, Hampus, Lindestam, Viktor January 2018 (has links)
Bakgrund: Enligt Richards (2014) har digitalisering förvandlat plockprocessen och förbättrat noggrannhet och produktivitet signifikant. Bilvårdsgrossisten upplever att deras plockprocess fungerar relativt bra men att det finns vissa brister som kan lösas av digitalisering. De är därför benägna att effektivisera den med hjälp av mer digitaliserade lösningar och de vill även veta vad som krävs vid en implementering. Syfte: Syftet med uppsatsen är att undersöka företagets plockprocess hur det ser ut idag för att sedan identifiera brister och problem. Baserat på dessa brister syftar arbetet på att diskutera alternativ som finns som kan förbättra denna process genom digitalisering. Detta för att stödja valet av digitalisering för fallföretaget och andra företag i en liknande situation. Vidare är syftet också att undersöka hur dessa lösningar kan implementeras och att ta fram kriterier som krävs för implementering samt förbereda för eventuella problem eller utmaningar. Metod: Studiens metod är av kvalitativ karaktär och för att besvara studiens frågeställningar har författarna använt sig av en fallstudie på Bilvårdsgrossisten. Det har också skett en jämförande studie med ett företag inom koncernen som i studien benämns Koncernbolaget. Empiri har samlats in genom semi-strukturerade intervjuer och observationer. Slutsats: I Bilvårdsgrossistens plockprocess har följande brister identifierats: fel i sorteringen av plocklistor, felplock, att lagerplatser inte påfyllts när plockare ska hämta artiklar, att plock av mindre artiklar går långsamt, att plock görs separat för varje kundorder och att produktiviteten är relativt låg. I frågeställning två har lösningar inom digitalisering analyserats och sammanställts i en tabell där de kopplas ihop med de identifierade bristerna på Bilvårdsgrossisten. Sammanfattningsvis kan mycket av de brister som identifierats kopplas ihop med alla de digitaliserade lösningar som presenterats och att användandet av WMS är en stor faktor på lösningarna. Slutligen har frågeställning tre visat att vid implementering av nya lösningar kan Bilvårdsgrossisten förvänta sig visst motstånd från anställda, det kommer krävas finansiell och tidsmässig investering. Det kommer att krävas strategi, planering, ledning av förändring samt systemstöd. Avslutningsvis kommer ledningen spela stor roll för att implementering ska lyckas. Det kommer att påverka dagligt arbete negativt. / Background: According to Richards (2014) digitalization has transformed the order picking process and improved accuracy as well as productivity significantly. The company Bilvårdsgrossisten considers their order picking process to be working fairly well but it has some flaws that can be solved by digitalization. They are therefore interested in making the process more efficient through through digitalized solutions and they also want information on what is required to implement these solutions. Purpose: The purpose of this paper is to investigate the company's picking process how it looks today to identify flaws and problems. Based on these flaws, the work aims at discussing options that can improve this process through digitization. This, in support of the choice of digitization for the case company and other companies in a similar situation. Furthermore, the purpose is also to investigate how these solutions can be implemented and to develop criteria that are required for implementation and to prepare for any problems or challenges. Method: The method of study is of a qualitative nature and, in order to answer the study's questions, the authors have used a case study at Bilvårdsgrossisten. There has also been a comparative study with a company within the concern, which in the study is called Koncernbolaget. Empirics has been collected through semi-structured interviews and observations. Conclusion: In the studied company´s picking process, the following flaws have been identified: errors in the sorting of picklists, picking errors, empty stock when pickers are about to pick up articles, picking up smaller items slowly, picking separately for each customer order, and low productivity. In question two, solutions in digitization have been analyzed and compiled in a table where they are linked to the identified flaws of Bilvårdsgrossisten. In summary, many of the identified flaws can be linked to all the digitized solutions presented and that the use of WMS is a major factor in the solutions. Finally, question three has shown that when implementing new solutions, Bilvårdsgrossisten can expect some resistance from employees, financial and time-related investment will be required. It will require strategy, planning, leadership of change as well as system support. In conclusion, the management w
146

Experimental Optical Pulse Picker for Lawrence Livermore National Lab

Wargo, Alexander Thomas 01 March 2019 (has links)
Proprietary.
147

Design robotického sběrače golfových míčků / Design of Robotic Golf Ball Picker

Myška, Miroslav January 2015 (has links)
The main aim of this master's thesis is create golf ball picker with charging station. These two components create the system, which automates process of golf ball collection on driving range. The robot replaces human manual activity in this branch and it eliminates injury. On the other hand, robot respects functional, psychological, ecological and aesthetic demands. It demarcates standard principles of these days and new way how to collect balls on driving range.
148

Bipartitní grafy pro analýzu mikrobiomů / Bipartite graphs for microbiome analysis

Šafárová, Marcela January 2017 (has links)
Microorganisms are all around us. Some of them even live in our body and are essential for our healthy being. Study of microbial communities based on their genetic content has become very popular with the development of new technologies, which enable easy reading of DNA or RNA. The key role of these studies is usually to characterize significant microbial patterns of an environment. However, currently used visualization tools have many drawbacks for such analyses. The subject of this thesis is to design a R/Bioconductor package for simple creation of bipartite graphs from microbial data. This type of visualization brings many advantages for microbiome analysis. Benefits of bipartite graphs are further demonstrated by analysis of main parameters affecting computer processing of microbial data.
149

Effektivisering genom utökning av automatiserad plockprocess : En fallstudie om skillnaderna mellan manuell- ochautomatiserad plockprocess på Arla Foods / Efficiency through an increase of the automated order picking process : A case study representing the differences between manual and automated orderpicking processes at Arla Foods.

Bahhi, Rama, Velic, Erna January 2022 (has links)
Context: Globalization and a growing logistic structure is forcing organizations to maintain their market share through logistics control. Additionally, this can be accomplished by making one of the most essential processes, order picking more efficient and effective. The development of the logistics structure has resulted in automated systems attracting a large amount of attention. The writers inquire into the benefits of an increasing use of automated order picking methods. Along with highlighting the challenges and driving forces of manual and automated order picking processes.  Purpose: This study's main purpose is to analyze possibilities of increasing efficiency through a change from manual order picking to automated order picking for non-self-manufactured products, in the organization Arla Foods AB.  Method: The method that is applied to generate a result in this study is a qualitative method with quantitative data. This has been accomplished through observations and a semi-structured interview. In addition to this the empirical material has been analyzed through pattern comparison.  Results & Conclusion: The empirical material illustrated that manual order picking included waste to a greater degree in contrast to automated order picking due to the variable of human labor. Unlike the Multipick system that is automated, human labor includes more challenges and is affected by external disturbances to a larger extent. Following the study has established that Arla Foods Multipick system has a higher delivery- security and reliability which has a relation to creating higher quality services.
150

Utveckling av Value Stream Mapping : En kvalitativ studie av en lagerverksamhets varuflöde

Axelsson, Casper, Eriksén, Viktor January 2022 (has links)
Företag har länge strävat efter att maximera kundnytta och bygga konkurrenskraft. Ett populärt sätt att göra det på är att använda sig av effektivitetsförbättrande filosofier. Lean Production är en sådan filosofi och den syftar till ett systematiskt förbättringsarbete i tillverkande företag där målet är att identifiera och eliminera slöserier för att bygga en snabbare och mer kvalitativ verksamhet. Det senaste decenniet har en utveckling av Lean Production ägt rum och återfinns nu även i en annan kontext, lagerverksamheter. På grund av e-handelns tillväxt har lagerverksamheter sett ett större behov av att ständigt arbeta med förbättringar och effektivisering. Eftersom Lean Production traditionellt varit anpassad till tillverkande företag har en specifik filosofi kallad Lean Warehousing utvecklats. Inom Lean Production har det arbetats fram vissa verktyg som syftar till att identifiera och eliminera slöserier i tillverkande företag. Dessa verktyg har inte anpassats till Lean Warehousing. Ett sådant verktyg är Value Stream Mapping, som syftar till att visualisera och kartlägga ett företags värdeskapande flöde med målet att identifiera slöserier. Tidigare forskning har visat att Value Stream Mapping har använts i en rad andra kontexter, däremot har ingen studie anpassat verktyget för lagerverksamheter. Detta har lett till studiens forskningsfråga: Hur kan Value Stream Mapping utvecklas för att bättre anpassas till en lagerverksamhet? Den teoretiska referensramen bygger på forskning inom området. Studier och litteratur om Lean Warehousing, lagerverksamheter i stort och om huvudaktiviteten orderplock presenteras. Kapitlet beskriver Value Stream Mapping och hur det använts i tillverkande företag. Vidare har det gjorts en genomgång av tidigare utvecklingar av verktyget och kapitlet avslutas sedan med att introducera ett nytt tillvägagångssätt. Avslutningsvis presenteras studiens resultat. De genomförda kvalitativa intervjuerna med hjälp av den teoretiska referensramen har utmynnat i en utvecklad modell – Warehouse Value Stream Mapping – med kontextspecifika anpassningar i form av mål kopplade till verksamheten och Key Performance Indicators som återspeglar orderplocket i lagerverksamheter. Föreliggande studie synliggör hur en anpassad modell av Value Stream Mapping bör se ut för att bättre kunna användas i lagerverksamheter i syfte att identifiera och eliminera slöseri och därmed effektivisera verksamheten.

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