943 resultados para flexible manufacturing system
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A series of 4 experiments examined the performance of rats with retrohippocampal lesions on a spatial water-maze task. The animals were trained to find and escape onto a hidden platform after swimming in a large pool of opaque water. The platform was invisible and could not be located using olfactory cues. Successful escape performance required the rats to develop strategies of approaching the correct location with reference solely to distal extramaze cues. The lesions encompassed the entire rostro-caudal extent of the lateral and medial entorhinal cortex, and included parts of the pre- and para-subiculum, angular bundle and subiculum. Groups ECR 1 and 2 sustained only partial damage of the subiculum, while Group ECR+S sustained extensive damage. These groups were compared with sham-lesion and unoperated control groups. In Expt 1A, a profound deficit in spatial localisation was found in groups ECR 1 and ECR+S, the rats receiving all training postoperatively. In Expt 1B, these two groups showed hyperactivity in an open-field. In Expt 2, extensive preoperative training caused a transitory saving in performance of the spatial task by group ECR 2, but comparisons with the groups of Expt 1A revealed no sustained improvement, except on one measure of performance in a post-training transfer test. All rats were then given (Expt 3) training on a cueing procedure using a visible platform. The spatial deficit disappeared but, on returning to the normal hidden platform procedure, it reappeared. Nevertheless, a final transfer test, during which the platform was removed from the apparatus, revealed a dissociation between two independent measures of performance: the rats with ECR lesions failed to search for the hidden platform but repeatedly crossed its correct location accurately during traverses of the entire pool. This partial recovery of performance was not (Expt 4) associated with any ability to discriminate between two locations in the pool. The apparently selective recovery of aspects of spatial memory is discussed in relation to O'Keefe and Nadel's (1978) spatial mapping theory of hippocampal function. We propose a modification of the theory in terms of a dissociation between procedural and declarative subcomponents of spatial memory. The declarative component is a flexible access system in which information is stored in a form independent of action. It is permanently lost after the lesion. The procedural component is "unmasked" by the retrohippocampal lesion giving rise to the partial recovery of spatial localisation performance.
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Arkitus on kartongin jatkojalostusmuoto, jonka tehokkuus muodostuu monen tekijän vaikutuksesta. Tämän työn tavoitteena oli parantaa arkitustehokkuutta tutkitussa kahden folioleikkurin arkittamossa tuotannonsuunnittelun ja tuotannonohjauksen kehittämisellä. Kartonkitehtaan sisäisessä jalostusketjussa arkitus on viimeinen vaihe, mikä tekee siitä pitkälti riippuvaisen edeltävistä konevaiheista, eli kartonkikoneista ja PE-päällystyskoneista. Pelkkä arkituksen tuotannonsuunnittelun huomiointi ei siis vielä takaa hyvää lopputulosta arkitustehokkuuden kannalta. Folioarkitustoiminta on hyvin asiakassuuntautunutta. Arkkikoot määräytyvät asiakkaiden omien tarpeiden perusteella, jolloin eri arkkikokojen kokonaismäärä kasvaa huomattavan suureksi. Viime vuosien trendinä on ollut tilauseräkokojen pieneneminen. Näiden tekijöiden yhteisvaikutuksena arkituksen tuotantoprosessille on ominaista erilaisten asetusten aiheuttama katkonaisuus. Lisäksi pelkästään yhden millimetrin muutos arkin leveydessä voi usein vaikuttaa arkitustehokkuuteen hyvinkin merkittävästi. Näistä syistä arkituksen tuotannonsuunnittelun apuvälineeksi tarvitaan tarkkuuteen ja joustavuuteen kykenevää tietojärjestelmää. Tehokkaan tuotannonohjauksen tueksi tarvitaan lisäksi erilaisia leikkuri- ja kartonkilaatukohtaisia raportteja. Työn teoriaosassa käsitellään tarkemmin arkitustoiminnan ominaisuuksia ja sen tehokkuuteen vaikuttavia tekijöitä. Lisäksi käsitellään tuotannonsuunnittelun ja tuotannonohjauksen periaatteita ja toimintoja.
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Peer-reviewed
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The purpose of this research is to describe how the scope of internationalization affects partner management in software companies. The effects are analyzed separately for small and large companies. Partner management is described from three perspectives: who should manage partnerships, how they should be managed and how does the context affect the choice of management style. Inductive case study is selected as research design. Eventually four case companies are chosen. The findings reveal that the size of the company affects the volume whereas the scope of internationalization affects the choice of partner management activities. Companies with high scope of internationalization required a more formal yet flexible management system whereas companies with low scope of internationalization relied more on the informal relations and personal management.
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Työssä esitellään käytetyimpiä tuotantofilosofioita. Tuotantofilosofia on hyvin laaja käsite ja sen vuoksi myös jotkin esiteltävistä menetelmistä ovat hyvin kaukana toisistaan. Työ koostuu teoriaosiosta, jossa on esitelty kukin tuotantofilosofia ja lopuksi johtopäätöksiä-osiossa käsitellään sitä, kuinka menetelmät liittyvät toisiinsa. Työssä esitellään JIT/JOT-tuotanto, Lean-tuotanto, Monozukuri, Modulointi, Standardointi, Strategiatyö, Six Sigma, TQM, TPM, QFD, MFD, Simulointi, Digitaalinen valmistus, DFX ja ns. uudet tuotantofilosofiat. Eri menetelmistä löytyvää lähdemateriaalia on tarjolla monipuolisesti, josta johtuen menetelmistä on voitu esitellä vain pääpiirteet. Tuotantofilosofioiden avulla voidaan saavuttaa monia eri asioita. Osa menetelmistä on luotu tuotannon tehostamiseksi ja yksinkertaistamiseksi, osa puolestaan lisää tuotannon tai koko yrityksen laatutasoa ja osa puolestaan helpottaa tuotteiden suunnittelu-työtä. Moni esiteltävistä filosofioista ei istu yksinomaan yhteen edellä mainituista kategorioista vaan kattaa laajempia alueita pitäen sisällään jopa kaikkia kolmea mainittua tulosta. Näiden lisäksi työssä on esitelty lyhyesti uusia tuotantofilosofioita, jotka ovat hieman irrallisia kokonaisuuksia verrattuna muihin työssä esiteltäviin filosofioihin. Työn tarkoituksena on auttaa hahmottamaan suurta kokonaisuutta jonka tuotantofilosofiat tuottavat. On tärkeää osata hahmottaa filosofioiden riippuvuus toisistaan ja se, että otettaessa käyttöön jotain tuotantofilosofiaa, tarkoittaa se myös mahdollisesti monen muunkin asian huomioonottamista. Tätä näkökantaa selvennetään johtopäätöksissä.
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Tullit ja kuljetuskustannukset haittaavat suomalaisten puutuotteiden hintakilpailua Venäjällä, mikä on luonut tarpeen uudenlaisten toimintamallien kehittämiselle. Tutkimuksen hypoteesina on, että soveltamalla teorioita mobiilista tuotantojärjestelmästä puutalotuotantoon pystytään vastaamaan aluerakennustoiminnan ongelmiin ja saavuttamaan kustannusetuja. Tämän työn tavoitteena on antaa yritysjohdolle kuvaus siirrettävän talotehtaan tuotantokonseptista ja arvioida toiminnan kannattavuutta. Työn tulosten avulla pyritään vastaamaan kysymyksiin: millainen on siirrettävä puutalotehdas ja onko mobiilitehdaskonsepti puutalotuotannossa taloudellisesti kannattava. Tutkimusta tarkastellaan Venäjän liiketoiminta- ja Venäjän puurakentamiskontekstissa. Tutkimus on laadullinen tapaustutkimus, jossa käytettiin useiden menetelmien yhdistelmää. Tutkimusmenetelmät sisälsivät sekä teknisen suunnittelun että kannattavuuden arvioinnin menetelmiä. Työn tekninen osa perustui tehdassuunnittelun ja konseptin kehittämisen menetelmiin. Taloudellisessa tarkastelussa käytettiin tuloslaskelmaa sekä tuottoasteen ja takaisinmaksuajan menetelmiä. Eri tekijöiden vaikutusta kannattavuuteen arvioitiin herkkyysanalyysilla. Työssä esitellään mobiilin talotehtaan tehdassuunnitelma ja tuotantokonsepti sekä sivutaan logistista konseptia. Mobiiliin talotehtaaseen sovellettiin mobiilitehdaskonseptia ja verstastuotantomallia. Mobiili talotehdas koostuu kokoonpanolinjasta, jota täydennetään esivalmistusverstailla. Investoinnille laskettiin kannattavuutta kuvaavat tunnusluvut, joiden perusteella mobiilitehdas todettiin kannattamattomaksi ja riskialttiiksi. Kannattavuuden epävarmuutta analysoitiin herkkyysanalyysillä. Kannattavuuteen vaikuttavat merkittävästi muuttuvien kustannusten ja myyntihinnan muutokset. Työssä annetaan toimenpide-ehdotuksia siirrettävän talotuotannon konseptin kehittämiseen. Keskeiset jatkotutkimuskohteet liittyvät mobiilitehtaan elinkierron toimintojen ja osakonseptien kehittämiseen.
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The dissertation proposes two control strategies, which include the trajectory planning and vibration suppression, for a kinematic redundant serial-parallel robot machine, with the aim of attaining the satisfactory machining performance. For a given prescribed trajectory of the robot's end-effector in the Cartesian space, a set of trajectories in the robot's joint space are generated based on the best stiffness performance of the robot along the prescribed trajectory. To construct the required system-wide analytical stiffness model for the serial-parallel robot machine, a variant of the virtual joint method (VJM) is proposed in the dissertation. The modified method is an evolution of Gosselin's lumped model that can account for the deformations of a flexible link in more directions. The effectiveness of this VJM variant is validated by comparing the computed stiffness results of a flexible link with the those of a matrix structural analysis (MSA) method. The comparison shows that the numerical results from both methods on an individual flexible beam are almost identical, which, in some sense, provides mutual validation. The most prominent advantage of the presented VJM variant compared with the MSA method is that it can be applied in a flexible structure system with complicated kinematics formed in terms of flexible serial links and joints. Moreover, by combining the VJM variant and the virtual work principle, a systemwide analytical stiffness model can be easily obtained for mechanisms with both serial kinematics and parallel kinematics. In the dissertation, a system-wide stiffness model of a kinematic redundant serial-parallel robot machine is constructed based on integration of the VJM variant and the virtual work principle. Numerical results of its stiffness performance are reported. For a kinematic redundant robot, to generate a set of feasible joints' trajectories for a prescribed trajectory of its end-effector, its system-wide stiffness performance is taken as the constraint in the joints trajectory planning in the dissertation. For a prescribed location of the end-effector, the robot permits an infinite number of inverse solutions, which consequently yields infinite kinds of stiffness performance. Therefore, a differential evolution (DE) algorithm in which the positions of redundant joints in the kinematics are taken as input variables was employed to search for the best stiffness performance of the robot. Numerical results of the generated joint trajectories are given for a kinematic redundant serial-parallel robot machine, IWR (Intersector Welding/Cutting Robot), when a particular trajectory of its end-effector has been prescribed. The numerical results show that the joint trajectories generated based on the stiffness optimization are feasible for realization in the control system since they are acceptably smooth. The results imply that the stiffness performance of the robot machine deviates smoothly with respect to the kinematic configuration in the adjacent domain of its best stiffness performance. To suppress the vibration of the robot machine due to varying cutting force during the machining process, this dissertation proposed a feedforward control strategy, which is constructed based on the derived inverse dynamics model of target system. The effectiveness of applying such a feedforward control in the vibration suppression has been validated in a parallel manipulator in the software environment. The experimental study of such a feedforward control has also been included in the dissertation. The difficulties of modelling the actual system due to the unknown components in its dynamics is noticed. As a solution, a back propagation (BP) neural network is proposed for identification of the unknown components of the dynamics model of the target system. To train such a BP neural network, a modified Levenberg-Marquardt algorithm that can utilize an experimental input-output data set of the entire dynamic system is introduced in the dissertation. Validation of the BP neural network and the modified Levenberg- Marquardt algorithm is done, respectively, by a sinusoidal output approximation, a second order system parameters estimation, and a friction model estimation of a parallel manipulator, which represent three different application aspects of this method.
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In any manufacturing system, there are many factors that are affecting and limiting the capacity of the entire system. This thesis addressed a study on how to improve the production capacity in a Finnish company (Viljavuuspalvelu Oy) through different methods like bottleneck analysis, Overall Equipment Effectiveness (OEE), and Just in Time production. Four analyzing methods have been studied in order to detect the bottleneck machine in Viljavuuspalvelu Oy. The results shows that the bottleneck machine in the industrial area that constraint the production is the grinding machine while the bottleneck machine in the laboratory section is the photometry machine. In addition, the Overall Equipment Effectiveness (OEE) of the entire system of the studied case was calculated and it has been found that the OEE of the Viljavuuspalvelu Oy is 35.75%. Moreover, two methods on how to increase the OEE were studied and it was shown that either the total output of the company should be 1254 samples/shift in order to have an OEE around 85% which is considered as a world class or the Ideal run rate should be 1.45 pieces/minute. In addition, some realistic methods are applied based on the finding in this thesis to increase the OEE factor in the company and in one realistic method the % OEE has increase to 62.59%. Finally, an explanation on how to implement the Just in Time production in Viljavuuspalvelu Oy has been studied.
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Arbeitszeitpolitik und Arbeitszeitgestaltung haben seit dem Tarifkompromiss im Jahre 1984 in der Metall-, und Elektroindustrie in der politischen und wissenschaftlichen Diskussion einen immensen Bedeutungszuwachs erfahren. Die Forderungen nach einer flexibleren Arbeitszeitgestaltung haben zeitgleich sowohl aus der Globalisierungsdiskussion und der Debatte um die Wettbewerbsfähigkeit des "Wirtschaftsstandorts Deutschland" heraus wie auch aus beschäftigungspolitischen Gründen neuen Auftrieb bekommen. Die Diskussion um die Arbeitszeit ist gleichzeitig von verschiedenen, meist gegensätzlichen Interessen geprägt: Auf der Beschäftigtenseite zielt die Arbeitszeitflexibilisierung nach wie vor auf Zeitsouveränität: d.h. auf eine bessere Vereinbarkeit der Arbeitszeit mit allen Aktivitäten außerhalb der Arbeitszeit ab. Demgegenüber stellt die Arbeitgeberseite den betriebswirtschaftlichen Aspekt in den Vordergrund. D.h. die Anpassung der Arbeitszeit an den tatsächlichen Arbeitsanfall. So soll durch aufeinander abgestimmte Gestaltung von Betriebszeit und Arbeitszeit die Erhöhung der Produktivität und die Sicherung der Wettbewerbsfähigkeit erzielt werden. Durch diesen Trend verlor das sog. Normalarbeitsverhältnis an Allgemeingültigkeit und die Flexibilisierung der Arbeitszeiten nahm seit langem kontinuierlich zu. Folge ist, dass mittlerweile eine breite Palette von Arbeitszeitmodellen existiert, in denen die gesetzlich und vertraglich vereinbarte Wochenarbeitszeit in den Dimensionen Lage, Länge und Verteilung flexibilisiert wird. Auch die Tarifverhandlungen und Auseinandersetzung der Tarifparteien zur Arbeitszeitpolitik sind dadurch gekennzeichnet, dass die Arbeitszeitflexibilisierung und Verlagerung der Tarifpolitik auf betriebliche Ebene einen Bedeutungszuwachs bekam und die Meinungsführerschaft in Sachen Arbeitszeitgestaltung von der IG Metall zu Gesamtmetall wechselte. Ziel der vorliegenden Dissertation war es, anhand einer empirisch-historischen Untersuchung über Einstellungen sowie Strategien von Gesamtmetall und IG Metall die Gestaltungsspielräume flexibler Arbeitszeitmodelle zu bestimmen und gleichzeitig die Defizite herauszuarbeiten. Die Untersuchung gründete sich in erster Linie auf die Dokumentenanalyse von Stellungnahmen der Gesamtmetall und IG-Metall-Leitungsgremien sowie Primär- und Sekundäranalyse von Befragungen der Beschäftigten. Die leitende Frage der Untersuchung war, ob es den Arbeitgeberverbänden und den Gewerkschaften gelingen konnte, die Erfordernisse eines Betriebes und die Belange der Beschäftigten weitgehend in Übereinstimmung zu bringen? Und (wenn ja) unter welchen Voraussetzungen die neuen flexiblen Arbeitszeitsysteme mit den betrieblichen und außerbetrieblichen Interessen der Beschäftigten zu vereinbaren sind. Den Hintergrund für diese Zielerreichung bildete der gesellschaftliche Konflikt zwischen Arbeit und Kapital. Denn die Schwierigkeit bzw. Komplexität lag in der Frage, wie die unterschiedlichen Interessen, die sich in der industriekapitalistischen Gesellschaft durch den Gegensatz "Kapital" und "Arbeit" bestimmen lassen, zu vereinbaren waren bzw. sind.
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The costs of dispersal are an important factor promoting natal philopatry, thereby encouraging the formation of social groups. The red fox, Vulpes vulpes, exhibits a highly flexible social system and one that is thought to represent a possible stage in the evolution of more complex patterns of group-living. Although the potential benefits accruing to philopatric offspring have previously been studied in this species, the potential costs of dispersal have received less attention. We contrasted survival rates, nutritional status, injuries and reproductive output of dispersing and non-dispersing male and female foxes in an urban population to assess the relative costs of dispersal versus natal philopatry. Mortality rates were not significantly higher for dispersing foxes, either in the short- or long-term. There was no evidence of increased nutritional stress in dispersing individuals. Dispersing individuals did, however, exhibit greater levels of wounding, although this did not appear to affect survival. Dispersing females were more likely to miss a breeding opportunity early in their reproductive lifespan. In contrast, both dispersing and non-dispersing males were unlikely to breed in their first year. We conclude that the major fitness component in females affected by dispersing is age at first reproduction.
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We present a new, power-free and flexible detection system named MCFphone for portable colorimetric and fluorescence quantitative sandwich immunoassay detection of prostate specific antigen (PSA). The MCFphone is composed by a smartphone integrated with a magnifying lens, a simple light source and a miniaturised immunoassay platform, the Microcapillary Film (MCF). The excellent transparency and flat geometry of fluoropolymer MCF allowed quantitation of PSA in the range 0.9 to 60 ng/ml with < 7 % precision in 13 minutes using enzymatic amplification and a chromogenic substrate. The lower limit of detection was further improved from 0.4 to 0.08 ng/ml in whole blood samples with the use of a fluorescence substrate. The MCFphone has shown capable of performing rapid (13 to 22 minutes total assay time) colorimetric quantitative and highly sensitive fluorescence tests with good %Recovery, which represents a major step in the integration of a new generation of inexpensive and portable microfluidic devices with commercial immunoassay reagents and off-the-shelf smartphone technology.
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O objeto de estudo desta dissertação é a aplicação de ferramentas para o controle da qualidade e melhoria do processo de produção de uma etapa construtiva de edificações residenciais. As ferramentas aplicadas são: i) controle estatístico do processo – CEP, e; ii) dispositivos Poka-Yoke. A etapa construtiva mencionada é a elevação da estrutura de concreto armado. O estudo foi motivado pela necessidade de melhorar o sistema de manufatura de uma empresa construtora de Porto Alegre – RS, com vistas a reduzir o tempo de construção de suas edificações (lead-time de produção). Para tanto, a partir de conceitos teóricos do Sistema Toyota de Produção – STP, analisou-se o processo produtivo atual para a referida etapa construtiva, identificaram-se perdas existentes no processo e foram propostas melhorias. As ferramentas de qualidade CEP e Poka-Yoke enquadram-se dentro dessa perspectiva de melhoria. Através da sua aplicação, pretende-se eliminar algumas das perdas existentes no processo de construção melhorando sua produtividade e a qualidade do produto final. A aplicação do CEP tem como objetivo avaliar a capacidade do fornecedor de concreto de atender às exigências dos consumidores, de acordo com o que é estipulado pelas normas brasileiras de fabricação e aceitação de concreto, sem impor-lhes ônus desnecessário. A avaliação é efetuada através do monitoramento da variabilidade da propriedade que melhor caracteriza a qualidade do concreto, qual seja, a sua resistência à compressão axial. Os dispositivos Poka-Yoke, por sua vez, são aplicados com funções de controle da qualidade e prevenção de defeitos e, como ferramentas auxiliares na melhoria de atividades produtivas.
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O comércio eletrônico é uma força que promete mudar definitivamente o cenário das empresas e seu relacionamento com clientes, fornecedores e parceiros. De olho no crescimento explosivo da Internet e da Web, as empresas estão aprendendo a utilizar o comércio eletrônico em seus processos de negócio tanto quanto nas suas estratégias de integração interna e externa. Os bancos têm, desde há muito, estado entre as empresas que mais investem em tecnologia de informação para apoiar os seus processos de negócio, buscar a eficiência empresarial e aumentar a qualidade dos seus serviços. Tendo suas origens na convergência tecnológica entre a computação e a telecomunicação, o comércio eletrônico abre um leque de oportunidades aos bancos que há muito buscam alternativas para oferecer aos seus clientes a possibilidade de operar serviços bancários remotamente, sem a necessidade de deslocamento até Uma agência. Mas a importância da evolução do comércio eletrônico para os bancos é ainda maior se for considerado que não há comércio sem pagamento e os bancos são os principais responsáveis pela manutenção de um sistema de pagamento confiável e versátil. Portanto, a crescente utilização da Web e da Internet pelos bancos implica também na consolidação do comércio eletrônico, tanto pela sua importância no controle dos meios de pagamento quanto na confiabilidade que transmitem aos usuários dos sistemas eletrônicos de transferência de valor. Este trabalho tem como objetivo estabelecer critérios para avaliar a evolução do comércio eletrônico nos serviços bancários e a difusão do uso da Web entre os bancos. A partir da observação de que os bancos podem utilizar a Web para divulgar informação, distribuir produtos e serviços e melhorar o relacionamento com os clientes, foram realizadas pesquisas através de análises em Web sites, questionários e entrevistas, para caracterizar o ritmo, a direção, os determinantes e as implicações da evolução do uso da Web entre os bancos.
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O trabalho tem como objetivo avaliar e descrever analiticamente a implementação de práticas de manufatura enxuta pela Pirelli Pneus no seu complexo industrial da América Latina. Além de uma descrição estruturada e ampla dos princípios de produção de Toyota e fundamentos teóricos do Lean thinking, uma ênfase especial será dedicada ao projeto EGR (Especialistas em Gestão da Rotina), como uma ferramenta estratégica para ser usada pela empresa multinacional italiana no futuro próximo, de modo a alcançar um resultado mais eficaz e eficiente na gestão da rotina diária. Este projeto, que representa um componente significativo do Pirelli Manufacturing System (PMS) e, principalmente, voltado para supervisores e gestores de plantas, consiste principalmente em ajudar a empresa a desenvolver a capacidade empresarial para avaliar corretamente o gap potencial existente entre os resultados atuais e os esperados, para tanto entender os desvios, bem como as causas subjacentes, e melhorar continuamente o desempenho da empresa por meio da padronização de processos e redução de desperdicios. Esses objetivos podem ser perseguidos, atuando em dois meios essenciais: habilidades técnicas e comportamentais de liderança para apoiar cada equipe de projeto; uma maior eficácia na gestão de indicadores de desempenho nas diferentes unidades de fábrica, de acordo com KPIs estabelecidos no nível central pelo Head Quarter. Além disso, a investigação será focada na experiência peculiar da planta de Santo André, onde o EGR começou como piloto, com o objetivo de captar as alterações relevantes (no lado organizacional e econômico) que este projeto trouxe para a empresa, através da realização de pesquisa de campo e entrevistas, que são orientados a recolher provas, considerações e opiniões de todos os principais atores envolvidos.
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A partir de reflexão sobre uma hipotética transição do capitalismo em sua natureza manufatureira ao socialismo, procura-se deixar marcada a razão pela qual, seguindo a proposta de Marx, essa transição exige que a produção se realize sob a égide da maquinaria. Consegue-se, como parte dessa reflexão, identificar, para o caso da manufatura, um trade-off entre eficiência produtiva e humanização das atividades de trabalho. Procura-se esclarecer que, dada a natureza do taylorismo-fordismo como reinvenção da manufatura, o exercício de início especulativo passa a ter sentido histórico. Busca-se argumentar que a ampla assimilação do taylorismo-fordismo pela experiência de implantação do socialismo na União Soviética a aprisionou ao mencionado trade-off , fazendo com que a primeira experiência de superação do capitalismo se impregnasse perversamente da mediocridade imanente ao taylorismo-fordismo. Finalmente, são feitos rápidos comentários acerca dos desdobramentos da recente automação de base microeletrônica sobre a natureza de um projeto socialista.