1,720,954 research outputs found
Minskade orderstorlekars påverkan på produktionsplaneringen : En fallstudie av pappersmaskin 5 på Billerud i Gävle
No full textThe purpose of this study was to analyze how reduced order sizes affect the production planning of a paper machine (PM5) within Billerud, as well as suggest strategies to increase its planning flexibility and capacity utilization at varying order sizes. In this study where semi-structured interviews were conducted with key person in the planning and marketing departments as well as complementary literature studies focused on Advanced Planning Schedule (APS) systems, hybrid forecasting, lean and order size optimization. The related theories are all carefully applied to reflect the specific challenges identified in the case study. Together, they form a complex frame of reference that has enabled analysis, discussions and answers to the study's research questions in a structured and scientific manner. The study shows that PM5 today uses a twelve-campaign cycle with manual follow-ups in Excel reports and separate Gantt charts, which creates duplication of work and time delays. Since production is strictly order-driven without an inventory buffer, low order volumes result in both unused capacity and inefficient small runs, while varying forecasts require frequent manual adjustments. This leads to increased delays in planning and lost production time. The proposed measure indicates that a holistic approach where APS, forecasting and Lean principles interact not only increases flexibility in case of varying order sizes but also ensures a more predictable and cost-effective planning and production. The results and conclusions of the study show that the proposed measures can create a more coherent and efficient planning and production flow. By replacing manual routines with automated data updates every day, the need for manual adjustments can be reduced or eliminated, freeing up planners' time and reducing the risk of planning errors. In parallel, digital SMED tools contribute to shorter changeover times, which directly increases capacity utilization and lowers costs per order. Syftet med denna studie var att analysera hur minskade orderstorlekar påverkar produktionsplaneringen för en pappersmaskin (PM5) inom företaget, samt föreslå strategier för att öka dess planerings flexibilitet och kapacitetsutnyttjande vid varierande orderstorlekar. För att realisera studiens syfte genomfördes en fallstudie på Billerud, där semistrukturerade intervjuer utfördes med nyckelpersoner inom planerings- och marknadsavdelningarna samt kompletterande litteraturstudier som inriktades på APS-system, hybridprognoser, lean och orderstorleksoptimering. De valda teorierna är alla noggrant utvalda för att spegla de specifika utmaningar som identifieras i fallstudien. Tillsammans bildar de en sammansatt referensram som strukturerat och vetenskapligt har möjliggjort analys, diskussion och svar på studiens forskningsfrågor. Studien visar att PM5 använder idag en tolvkampanjcykel med manuella uppföljningar i Excel-rapporter och separata Gantt-scheman, vilket skapar dubbelarbete och tidsfördröjningar. Eftersom produktionen är strikt orderstyrd utan lagerbuffert, uppstår det vid låga ordervolymer bade outnyttjad kapacitet och ineffektiva småkörningar, samtidigt som varierande prognoser kräver frekventa manuella justeringar. leder detta till ökade utamningar i planerinmgen och förlorad produktionstid. De föreslagna åtgärderna visar att ett holistiskt tillvägagångssätt där APS-system, prognostisering och Lean-principer samverkar inte bara ökar flexibiliteten vid varierande orderstorlekar, utan också säkerställer en mer förutsägbar och kostnadseffektiv planering och produktion. Studiens resultat och slutsatser visar att de föreslagna åtgärderna kan skapa ett mer sammanhållet och effektivt planerings- och produktionsflöde. Genom att ersätta manuella rutiner med automatiserade datauppdateringar varje dag kan behovet av manuella justeringar minskas eller elimineras, vilket frigör tid för planerare och minskar risken för planeringsfel. Parallellt bidrar digitala SMED-verktyg till kortare omställningstider, vilket direkt ökar kapacitetsutnyttjandet och sänker kostnaderna per order
Minskade orderstorlekars påverkan på produktionsplaneringen : En fallstudie av pappersmaskin 5 på Billerud i Gävle
No full textThe purpose of this study was to analyze how reduced order sizes affect the production planning of a paper machine (PM5) within Billerud, as well as suggest strategies to increase its planning flexibility and capacity utilization at varying order sizes. In this study where semi-structured interviews were conducted with key person in the planning and marketing departments as well as complementary literature studies focused on Advanced Planning Schedule (APS) systems, hybrid forecasting, lean and order size optimization. The related theories are all carefully applied to reflect the specific challenges identified in the case study. Together, they form a complex frame of reference that has enabled analysis, discussions and answers to the study's research questions in a structured and scientific manner. The study shows that PM5 today uses a twelve-campaign cycle with manual follow-ups in Excel reports and separate Gantt charts, which creates duplication of work and time delays. Since production is strictly order-driven without an inventory buffer, low order volumes result in both unused capacity and inefficient small runs, while varying forecasts require frequent manual adjustments. This leads to increased delays in planning and lost production time. The proposed measure indicates that a holistic approach where APS, forecasting and Lean principles interact not only increases flexibility in case of varying order sizes but also ensures a more predictable and cost-effective planning and production. The results and conclusions of the study show that the proposed measures can create a more coherent and efficient planning and production flow. By replacing manual routines with automated data updates every day, the need for manual adjustments can be reduced or eliminated, freeing up planners' time and reducing the risk of planning errors. In parallel, digital SMED tools contribute to shorter changeover times, which directly increases capacity utilization and lowers costs per order. Syftet med denna studie var att analysera hur minskade orderstorlekar påverkar produktionsplaneringen för en pappersmaskin (PM5) inom företaget, samt föreslå strategier för att öka dess planerings flexibilitet och kapacitetsutnyttjande vid varierande orderstorlekar. För att realisera studiens syfte genomfördes en fallstudie på Billerud, där semistrukturerade intervjuer utfördes med nyckelpersoner inom planerings- och marknadsavdelningarna samt kompletterande litteraturstudier som inriktades på APS-system, hybridprognoser, lean och orderstorleksoptimering. De valda teorierna är alla noggrant utvalda för att spegla de specifika utmaningar som identifieras i fallstudien. Tillsammans bildar de en sammansatt referensram som strukturerat och vetenskapligt har möjliggjort analys, diskussion och svar på studiens forskningsfrågor. Studien visar att PM5 använder idag en tolvkampanjcykel med manuella uppföljningar i Excel-rapporter och separata Gantt-scheman, vilket skapar dubbelarbete och tidsfördröjningar. Eftersom produktionen är strikt orderstyrd utan lagerbuffert, uppstår det vid låga ordervolymer bade outnyttjad kapacitet och ineffektiva småkörningar, samtidigt som varierande prognoser kräver frekventa manuella justeringar. leder detta till ökade utamningar i planerinmgen och förlorad produktionstid. De föreslagna åtgärderna visar att ett holistiskt tillvägagångssätt där APS-system, prognostisering och Lean-principer samverkar inte bara ökar flexibiliteten vid varierande orderstorlekar, utan också säkerställer en mer förutsägbar och kostnadseffektiv planering och produktion. Studiens resultat och slutsatser visar att de föreslagna åtgärderna kan skapa ett mer sammanhållet och effektivt planerings- och produktionsflöde. Genom att ersätta manuella rutiner med automatiserade datauppdateringar varje dag kan behovet av manuella justeringar minskas eller elimineras, vilket frigör tid för planerare och minskar risken för planeringsfel. Parallellt bidrar digitala SMED-verktyg till kortare omställningstider, vilket direkt ökar kapacitetsutnyttjandet och sänker kostnaderna per order
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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