1,721,074 research outputs found
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
Financial Measures and Their Relations to Decoupling Points and Decoupling Zones
No full textPart 3: Knowledge Based Production ManagementInternational audienceFinancial management is concerned with the financial evaluation of activities performed in the supply chain. Each activity has implications on the financial situation but the actual cause-effect relation involved in this context is not always obvious. From a return on investment (ROI) perspective the financial measures revenue, cost, and assets, i.e. investment, are identified. Strategic lead-times have been highlighted in the literature as key components for flow design. Strategic lead-times are thereafter further analyzed and the relations between financial measures and strategic lead-times are outlined. Based on these relations, it is possible to establish a relation between financial measures, and decoupling points and decoupling zones. Subsequently this is shown to also provide a reference to supply chain management strategies as they are defined in the literature
An ontology for flow thinking based on decoupling points – unravelling a control logic for lean thinking
No full textContinuous flow is the guiding star for lean thinking and considered the ideal state for value streams. Despite this objective, it is seldom possible to obtain a state of continuous flow in a wider context. Decision makers face dynamic environments, and variable internal preconditions require a flow-thinking approach that provides support in response to these challenges. In the present study, the underlying logic of flow thinking is first identified as the key management layer, and thereafter the effectiveness of flow is targeted. The vision of continuous flow is challenged by different exogenous requirements that result in flow discontinuities. Flow thinking is then used to identify 10 decision categories based on these discontinuities, each related to a type of decoupling point and classified as time-based (exogenous) or conversion-based (endogenous). The flow-thinking approach is finally applied in three different contexts: a time-phased product structure, a modularized approach for planning and control, and a mixed-model value stream
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
Kundorderstyrning och frikopplingszoner
No full textMed kundorderstyrning avses att kundens önskemål på någotsätt påverkar, d v s styr, hur den försörjande enheten agerar.Den här kopplingen till kunder innebär att företag som befinnersig nära kunderna kan utveckla konkurrensfördelar somföretag på längre avstånd från kunderna har svårt att möta.Olika grad av kundorderstyrning innebär på så sätt en viktigmöjlighet för t ex svenska företag att stärka sin position påhemmamarknaden i förhållande till konkurrenter med produktioni andra länder. Det teoretiska stödet för att beskrivaförsörjningssystem ur ett kundorderstyrningsperspektiv ärdock relativt begränsat. En viktig komponent är kundorderpunktenmen det är ett lite trubbigt verktyg som framförallt äranvändbart i renodlade fall med en tydlig uppdelning i prognosdrivnaoch kundorderdrivna aktiviteter. Här ges en meromfattande teoretisk plattform för kundorderstyrning sombaseras på en generisk bas av frikopplingspunkter och frikopplingszonervilka sedan appliceras i termer av processdrivare(kundorderpunkt och kundorderzon) och slutligen tillämpasoch tolkas med exempel från MRPII respektive lean produktion</p
Dynamic Modelling and Analysis of Information Flows in Production-Inventory and Supply Chain Systems
No full textSystem dynamics is the fundamental concept of this academic dissertation. The focus is on analysis and modelling of properties representative for production-inventory and supply chain systems. The modelling approach is based on Industrial Dynamics but employs a hybrid approach of Control Theory and simulation in the analysis. Simplification based on a structural approach is performed on block diagrams of complex systems as a prerequisite of analysis. In general, there are three main activities of interest when modelling manufacturing systems from a system dynamics point of view. Thus forecasting, lead times and inventory replenishment rules are each analysed and the properties of the suggested models discussed. Analogies between delays and density functions are identified introducing the concept of expected dynamic behaviour. Inventory replenishment rules based on inventory position enables a decomposition of production-inventory systems, thus simplifying the inclusion of trigger decision rule models. A production-inventory system and the Forrester supply chain are analysed based on a system simplification approach. It is shown that the amplification of demand fluctuations of the original Forrester model is not due to the much quoted feedback effect. Instead it is shown that no net feedback exists within the echelons due to cancellations of feedback information. Hence, the amplification is due to the design of the feedforward of orders through the supply chain. A difficult problem is the performance evaluation of dynamic systems. It is known that the net present value of a system can easily be obtained if a Laplace or z-transform model of the system and its cash flows exists. This theory is expanded also to cover general state space models and an application to a simple production-inventory model is given. In most cases, however, the models do not capture all aspects of economic relevance. Instead, as a complement to the cash flow based analysis, a multiple criteria approach for evaluating complex systems is suggested.</p
Ledtidsbaserat ramverk för kundorderstyrning
No full textGrad av kundorderstyrning är ett av de mest kritiska besluten för att skapa konkurrensfördelar i en industriell verksamhet. Som beslutsstöd för den utmaningen presenteras här en ledtidsbaserad analysmodell. Modellen definierar beslutsdomäner och omfattar kritiska beslut om grad av senare-läggning, tjänstefiering, kundanpassning, utkontraktering, och transparens.</p
A service decoupling point framework for logistics, manufacturing, and service operations
No full textCompeting through goods only has turned out to be increasingly difficult unless efficiency and low-cost manufacturing are at the core of the business. Extending the offering by introducing customisation in combination with services has improved the effectiveness capability. Still, much remains to understand how these servitised businesses can be managed in an integrated fashion. Service operations management and manufacturing operations management have evolved along separate paths but are beginning to align, and by focusing on value adding processes some fundamental principles can be identified. Using a value driven and process-based approach the value offering is defined as provided by initial capabilities and adapting capabilities of the provider. From a supply chain perspective this is shown to be identical to the established approach of balancing efficiency and responsiveness (also referred to as leagility) based on the customer order decoupling point. As a consequence focus on efficiency is at the core of goods-based supply and focus on responsiveness is at the core of service-based supply.</p
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