complex production system
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2021 ◽  
Vol 40 (1) ◽  
pp. 103-115
Author(s):  
Xu Wang ◽  
Ying-Ming Wang

China has attracted the attention of the world owing its significant economic achievements, which are supported significantly by its booming industry. However, the issues of energy and pollutants have severely challenged the sustainability of the industry. The efficiency measurement is the premise intended to realize sustainability within the Chinese industry. Because the industry is a complex production system, there exists uncertainties and fuzziness regarding its inputs and outputs. This study proposes the application of an interval to describe these fuzzy data and employ the Enhanced Russell Measure to assess the performance of the Chinese industry, accounting for undesirable output such as pollution. In addition, for the ranking between interval efficiencies, a novel ranking approach based on the holistic acceptability of a possibility degree is proposed. The proposed method provides advice and guidance for decision makers to make appropriate and effective policies to balance industrial development and environmental protection in spite of uncertain and fuzzy data.


2020 ◽  
Vol 31 (4) ◽  
pp. 705-723 ◽  
Author(s):  
Raed EL-Khalil ◽  
Zachary Moran Leffakis ◽  
Paul C. Hong

PurposeThis paper empirically examines the implementation pattern of different types of lean management (LM) techniques on the shop-floor. Based on the socio-technical systems framework, LM techniques are classified as social improvement tools and technical process standardization and stability practices. This categorization facilitates investigating their implementation relationship in a complex production system.Design/methodology/approachBased on the survey data from managers of the three major US auto-manufacturers and their suppliers (n = 137), measurement scales are developed using confirmatory factor analysis for the LM process improvement, stability, and standardization constructs. Hypotheses are tested by applying the Sobel test technique for mediating regression.FindingsStatistical results confirm the mediation role of LM improvement tools between standardization and stability goal practices, indicating that technical process-oriented practices are not directly related and that their association is impacted by the corresponding implementation of social tools on the shop-floor.Practical implicationsThe results indicate that LM practices should not be randomly implemented on the shop-floor but rather adopted and executed based on a systematic pattern. In LM systems, the implementation of process stability, standardization, and improvement practices on the shop-floor are more tightly integrated than traditionally assumed.Originality/valueThis study establishes a new categorization of specific LM tools based on social and technical characteristics. The conclusions highlight the importance of adopting a social emphasize of continuous improvement to establish a technical focus of process standardization and stability for LM implementation success.


2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Yankun Wang ◽  
Binbin Xu ◽  
Tianqi Ma ◽  
Ziyue Wang

This paper involves a production system, which is composed of units (workstations) and buffers. The buffer is used to store semifinished and finished products in the production process, to reduce the impacts of bad equipment in the production system on the entire system performance. Considering the characteristics of the large number of components and the state of the buffers in the production system, this paper considers the influences of buffer states on upstream and downstream units. When using the availability as the allocation index and combining it with Markov theory, the production unit (workstation) and upstream and downstream buffers are regarded as an equivalent unit (workstation) with multiple output states. We establish the relationship between the availability of each equivalent unit (workstation) and the production system availability and determine a scaling factor for the availability of the equivalent unit to account for the system availability. The expected availability goal of the production system is allocated to each equivalent unit (workstation) by the scaling factor; then, the availability of each equivalent unit (workstation) is assigned to each unit. Finally, the Plant Simulation software is used to simulate and analyze the production system to verify the correctness of the allocation method and realize the reliability allocation from a complex production system to a unit.


2020 ◽  
Vol 51 ◽  
pp. 1439-1445
Author(s):  
Georgios Koulinas ◽  
Panagiotis Paraschos ◽  
Dimitrios Koulouriotis

2020 ◽  
Vol 311 ◽  
pp. 02004 ◽  
Author(s):  
Vladimir Volochienko ◽  
Ludmila Sorokina

The article deals with the feature’s projects portfolio formation of head enterprise that produces high-tech products. Methods the projects portfolio formation are considered: mathematical, simulation and economic-statistical. The factors that influence the choice of the model are illustrated.It is proposed to carry out research on the basis of creation complexes ofinterrelated, multi-level models and optimization-simulation approach. Themeans of implementing this approach are human-machine iterative,interactive procedures. To find the optimal solution by the decision maker,procedures should be based on the identification of the main goals andpreferences used in the creation of an optimal of the project portfolio, thestudy of a set of acceptable parameters and actions. The head enterprise is considered as a complex system described by severalmodels, to which the control scheme with direct and feedback is applicable,where: functional breakdown of the process of forming the projects portfolio into separate blocks justifies the use of multi-level modeling of a complex production system; in long-term planning and forecasting, it is necessary to solve both the direct problem of system consequences for a given “input”, and the inverse problem of planning, which has a significant spread of output parameters. In order to optimize the method, it is proposed to create iteration- optimization analytical models using the two-point boundary value method, including planning from the achieved and planning from the final result. Indicated the advantages of using a specialized mathematical apparatus inthe formation of the projects portfolio.


2018 ◽  
Vol 32 (31) ◽  
pp. 1850375
Author(s):  
Shuang Kan ◽  
Wei Lv ◽  
Fu Guo

Super network modeling has become an effective approach for analyzing complex systems. In this study, a super network is proposed in terms of systems science. A vital aspect of the modeling is the unique dynamic mechanism of the complex system, particularly the preferential mechanism. The preferential mechanism is the driving force of system evolution. However, in current studies, preferential probability has been mostly related to node degree, and there has been little consideration of multi-attribute decision-making based on complex system characteristics (multi-level, multi-traffic, etc.). Furthermore, association analysis of driving forces and the topology structure of the complex system should be highlighted to explore the operating mechanism. In this study, we consider a complex production system (CoPS) as the research object, propose a unique learning motivation mechanism and interaction mechanism of the CoPS, develop a preferential algorithm based on the interval-valued intuitionistic uncertain linguistic (IVIUL) operator, and construct a multi-organization knowledge learning super network model. A simulation experiment was conducted to explore the effect of the preferential parameter on learning performance. The results show that the feature of the project team has an important influence on the learning improvement velocity of the super network.


2017 ◽  
Vol 76 (5) ◽  
pp. 255-265 ◽  
Author(s):  
E. A. Sotnikov ◽  
K. P. Shenfeld

The paper considers conditions and methods for developing a strategic forecast for the technical and economic state of the worldwide and Russian railway transport for a period of 30-50 years or more. The analysis was made on changes in the state of infrastructure, rolling stock, organization of train traffic and shunting work, nature of the management of the transportation process from 1825 to the present. It is established that many quantitative and qualitative indicators of its technical and technological state have improved during this period many times and by orders of magnitude. This allowed the railway transport to ensure a high level of competitiveness in the transport system of the world, including our country, despite the emergence of all new modes of transport. At the same time, some such indicators are now close to the maximum possible and will not be able to grow rapidly in the future. It is accepted that in the development of strategic fore-casts of the technical and technological state of complex (large) production systems, it is necessary to determine the most important parameters, which in the long term can be improved many times substantially, which in the complex system under consideration will achieve a significant reduction in costs, and even increase their competitiveness. The main trends in the development of railways for a strategic long-term period are determined, taking into account the support of the development of its technical and technological state for the achievements of fundamental and branch science. These trends take into account both known solutions, for example, HS operation and new solutions. The implementation of the proposals will allow the railways to achieve a reduction in unit costs (per unit of transport output), preserve and increase their competitiveness in the constantly developing transport market.


Author(s):  
Mariane Scheffer Nazaro ◽  
Guilherme Marcelo Zanghelini ◽  
Edivan Cherubini ◽  
Karlan Rau ◽  
Sebastião Roberto Soares

As lâmpadas foram desenvolvidas da tecnologia incandescente, para a fluorescente e para o diodo emissor de luz (LED), o que aumentou a eficiência na conversão da iluminação e estendeu a vida útil do produto, consequentemente ocasionando na diminuição dos impactos ambientais. No entanto, a melhoria da fase de uso das lâmpadas, exige um sistema de produção mais complexo, incluindo (por vezes) materiais perigosos, o que piorou também sua disposição final. Estudos de Avaliação do Ciclo de Vida (ACV) são desenvolvidos desde 1996 envolvendo lâmpadas, e agora, com a evolução da tecnologia, as comparações estão ficando mais comuns. Esses estudos geram resultados variados, em que a unidade funcional (UF) desempenha um papel fundamental para gerar essas diferenças, mesmo quando os sistemas de produto são semelhantes, dificultando a compreensão das comparações. O objetivo deste artigo é analisar a produção científica de ACVs de lâmpadas, desenvolvendo um panorama dos sistemas de produto e suas definições de UF, bem como dos resultados, para indicar tendências e padrões da aplicação neste tema. A metodologia proposta foi de uma revisão integrativa da literatura aplicada a bases de dados científicos e outros documentos. A pesquisa identificou 16 artigos, onde ficou evidente o recente aumento dos estudos de ACVs comparativos. Nesta amostragem foram encontradas quatro diferentes definições de UF. Contudo, uma descrição complementar do desempenho do produto permite equalizar a UF numa base comum, em que os valores para a mudança climática têm mostrado que as lâmpadas LED são preferíveis às lâmpadas fluorescentes, que são preferíveis às incandescentes. Embora a comparação tenha sido possível, a UF deve ser claramente indicada para representar a função dos produtos, neste caso: a quantidade de lúmen.horas. Resumen Las lámparas se han desarrollado a partir de la tecnología incandescente, fluorescente, y un diodo emisor de luz (LED), lo que significa un aumento de la eficiencia de conversión de luz, que extiende la vida útil del producto y reduce así el impacto ambiental. Sin embargo, mejorar la fase de uso de las lámparas requiere un sistema de producción más complejo, incluyendo (a veces) materiales peligrosos, lo que empeora la disposición final. La Análisis del Ciclo de Vida (ACV) se ha dirigido a las lámparas desde 1996, y ahora con su evolución, las comparaciones son cada vez más comunes. Estos estudios llevan a resultados diferentes, donde la unidad funcional (UF) tiene un papel clave para la generación de estas diferencias, mismo cuando los sistemas de productos son similares, lo que dificultaría la comprensión general de las comparaciones. El objetivo fue analizar la producción científica de ACV de lámparas, el desarrollo de un marco de sistemas de productos, la definición de UF y los resultados para indicar tendencias y normas de aplicación de la metodología del ACV, incluyendo las posibilidades de comparabilidad. La metodología propuesta fue una revisión integrativa de la literatura aplicada a bases de datos científicas y análisis de contenido de documentos adicionales. La investigación identificó 16 artículos, donde está claro el reciente aumento en los estudios comparativos de ACV dirigidos a las tecnologías de iluminación. Había 4 diferentes definiciones de UF en los documentos. Sin embargo, la descripción adicional del rendimiento del producto permite equiparar el UF a una base común, donde los valores para el cambio climático han demostrado que las lámparas LED son mejores que las fluorescentes, que a su vez son preferibles que las incandescentes. Aunque esto podría ser posible, UF debe estar siempre claramente indicado y representar la función de los productos, en este caso la cantidad lúmen.hora de una lámpara Abstract Lamps have been developed since incandescent technology, to fluorescent and light emitted diode (LED), increasing lighting conversion efficiency, extending product’s life span, and, consequently, decreasing environmental impacts. However, improving the use phase of lamps demand a more complex production system, including (sometimes) hazardous materials, what have worsened final disposal as well. Life Cycle Assessment (LCA) has been addressed to lamps since 1996, and now with its evolution, comparisons are getting more common. These studies lead to different results, wherein functional unit (FU) plays a key role to generate these differences, even when product systems are similar, making difficult the overall understanding of comparisons. We aimed to analyze the scientific production of LCA of lamps, developing a framework of the product systems, the FU definition and the results to indicate trends and patterns of the LCA methodology application, including comparison possibilities. The proposed methodology was an integrative literature review applied to scientific databases and further papers content analysis. The survey identified 16 papers, where it is clear the recent increase on comparative LCA studies addressed to lighting technologies. There were 4 different FU definitions in papers. However, complementary description of product performance enable one to equalize FU into a common basis, wherein values for climate change have shown that LED lamps are preferable than fluorescents, that are preferable than incandescent. Even though this was possible, FU should be clearly indicated and represent products function, in this case: an amount of lumen-hour.


Procedia CIRP ◽  
2017 ◽  
Vol 62 ◽  
pp. 111-116 ◽  
Author(s):  
D.M. D’Addona ◽  
A.M.M. Sharif Ullah ◽  
R. Teti

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