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Effects of standardization-based coordination mechanisms in project performance 基于标准化的协调机制对项目绩效的影响
Q3 Engineering Pub Date : 2021-08-02 DOI: 10.1590/1806-9649-2021v28e5257
R. Moura, T. Carneiro, T. Dias
Abstract: Among the coordination mechanisms present in an organization defined by Mintzberg, there are the mechanisms based on standardization of processes, employee skills and outputs. This study intends to investigate, through an exploratory and quantitative approach, the relationship between standardization-based coordination mechanisms, considered essential for project objectives accomplishment, and project performance. In addition, it is proposed to investigate whether project size, project manager power, technical system complexity and external environment stability affect the relationship between standardization mechanisms and project performance. In order to test the proposed model, the structural equation modeling technique was used in an empirical research with 216 professionals that have already worked on projects. The results showed that work processes standardization has a significant effect on the performance of projects and that their effectiveness is greater in smaller projects, when the project manager has power of action, when the external environment is stable and the technical system is not complex. This study also showed evidence that the proper use of standardization-based coordination mechanisms may have its effects enhanced when contingency factors are considered.
摘要:在明茨伯格定义的组织协调机制中,有基于流程标准化、员工技能标准化和产出标准化的协调机制。本研究旨在通过探索性和定量的方法,调查基于标准化的协调机制(被认为是实现项目目标的必要条件)与项目绩效之间的关系。此外,本文还提出研究项目规模、项目经理权力、技术系统复杂性和外部环境稳定性是否会影响标准化机制与项目绩效之间的关系。为了验证所提出的模型,本文采用结构方程建模技术对216名已参与项目的专业人员进行了实证研究。研究结果表明,工作过程标准化对项目绩效有显著影响,且在规模较小、项目经理有实权、外部环境稳定、技术系统不复杂的情况下,工作过程标准化的有效性更大。本研究还表明,在考虑偶然性因素的情况下,适当使用基于标准化的协调机制可能会增强其效果。
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引用次数: 1
Comparison of artificial neural networks learning methods to evaluate supply chain performance 人工神经网络学习方法在供应链绩效评估中的比较
Q3 Engineering Pub Date : 2021-08-02 DOI: 10.1590/1806-9649-2021v28e5450
Antonio Ricardo Lunardi, Francisco Rodrigues Lima Junior
Abstract: The supply chain performance evaluation is a critical activity to continuously improve operations. Literature presents several performance evaluation systems based on multi-criteria methods and artificial intelligence. Among them, the systems based on artificial neural networks (ANN) excel due to their capacity of modeling non-linear relationships between metrics and allowing adaptations to a specific environment by means of historical performance data. These systems’ accuracy depend directly on the adopted training algorithm, and no studies have been found that assess the efficiency of these algorithms when applied to supply chain performance evaluation. In this context, the present study evaluates four ANNs learning methods in order to investigate which one is the most adequate to deal with supply chain evaluation. The algorithms tested were Gradient Descendent Momentum, Levenberg-Marquardt, Quasi-Newton and Scale Conjugate Gradient. The performance metrics were extracted from SCOR®, which is a reference model used worldwide. The random sub-sampling cross-validation method was adopted to find the most adequate topological configuration for each model. A set of 80 topologies was implemented using MATLAB®. The prediction accuracy evaluation was based on the mean square error. For the four level 1 metrics considered, the Levenberg-Marquardt algorithm provided the most precise results. The results of correlation analysis and hypothesis tests reinforce the accuracy of the proposed models. Furthermore, the proposed computational models reached a prediction accuracy higher than previous approaches.
摘要:供应链绩效评估是持续改进运营的关键活动。文献介绍了几种基于多准则方法和人工智能的绩效评估系统。其中,基于人工神经网络(ANN)的系统表现出色,因为它们能够建模指标之间的非线性关系,并允许通过历史性能数据适应特定环境。这些系统的准确性直接取决于所采用的训练算法,并且没有发现评估这些算法在应用于供应链绩效评估时的效率的研究。在这种背景下,本研究评估了四种神经网络学习方法,以研究哪种方法最适合处理供应链评估。测试的算法有梯度下降动量、Levenberg-Marquardt、准牛顿和尺度共轭梯度。性能指标是从SCOR®中提取的,SCOR®是世界范围内使用的参考模型。采用随机子抽样交叉验证方法为每个模型找到最合适的拓扑配置。使用MATLAB®实现了一组80种拓扑结构。预测精度评估基于均方误差。对于所考虑的四个1级度量,Levenberg-Marquardt算法提供了最精确的结果。相关分析和假设检验的结果增强了所提出模型的准确性。此外,所提出的计算模型达到了比以前的方法更高的预测精度。
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引用次数: 3
Sustainable competitive advantage and green innovation: a review of joint scale propositions 可持续竞争优势与绿色创新:联合规模命题述评
Q3 Engineering Pub Date : 2021-08-02 DOI: 10.1590/1806-9649-2021v28e5669
Olívia Carolina de Resende Ribeiro, P. S. Steiner Neto
Abstract: The objective of this work was to present the analysis instruments of Green Innovation that seek to relate it to Sustainable Competitive Advantage. Determining the research instruments through which we can analyze the relations between Organizational Capacity, Green Innovation, and Performance can enlighten us in what contributes with the levels of competitiveness of a specific industry, i.e., the sustainable competitive advantage. To do this, we focused on articles indexed in Thomson Reuters, ´Web of Science databank. We analyzed the articles have been most cited and which had presented scales for the analysis and understanding of Green Innovation instruments. We explored three of the most cited articles. These works address innovation from the perspective of Green Innovation and seek to analyze the superior performance of environmental innovations through specific scales. The studies in question adopt quantitative research approaches and operationalized through surveys. According to our analysis, the instruments can represent significant advances concerning the problem addressed in this study.
摘要:本研究的目的是提出绿色创新的分析工具,试图将其与可持续竞争优势联系起来。通过确定研究工具,我们可以分析组织能力、绿色创新和绩效之间的关系,可以启发我们对特定行业竞争力水平的贡献,即可持续竞争优势。为了做到这一点,我们专注于在汤森路透,Web of Science数据库中索引的文章。我们分析了被引用次数最多的文章,这些文章为分析和理解绿色创新工具提供了尺度。我们研究了三篇被引用最多的文章。这些作品从绿色创新的角度来探讨创新,并试图通过特定的尺度来分析环境创新的卓越绩效。有关研究采用定量研究方法,并通过调查加以实施。根据我们的分析,这些工具可以代表本研究中解决的问题的重大进展。
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引用次数: 4
An EWMA control chart for the mean of individual streams in multiple stream processes 多流过程中单个流均值的EWMA控制图
Q3 Engineering Pub Date : 2021-07-12 DOI: 10.1590/1806-9649-2021v28e062
B. Simões, E. Epprecht
Abstract: In a multiple stream process (MSP) a product is manufactured in a number of streams in parallel. The traditional tool for monitoring MSPs, the group control chart (GCC), does not take into account that typically the value of the quality variable in each stream is the sum of a component common to all streams and an individual component, of the particular stream. This may render the GCC ineffective in detecting shifts in the mean of individual streams. Based on this two-components model, we propose an exponentially weighted moving average (EWMA) GCC to monitor the means of the individual streams components. We optimize its design (minimizing the ARL for given shifts in the mean of a stream) and compare their ARLs with the ones of other existing charts devised for two-components MSPs. For this comparison, we needed to obtain optimal designs of these previous charts too, which were not available in the literature; this is an additional contribution of our work. The ARLs of the charts were obtained by simulation, with a number of runs sufficiently large to ensure precise results. The results show that the proposed chart outperforms the previous ones, becoming thus recommended for the statistical control of MSPs.
摘要:在多流工艺(MSP)中,产品是在多个流中并行生产的。用于监测MSP的传统工具,即组控制图(GCC),没有考虑到每个流中质量变量的值通常是所有流的公共分量和特定流的单个分量的总和。这可能使GCC在检测单个流的平均值的变化方面无效。基于这一双分量模型,我们提出了一种指数加权移动平均(EWMA)GCC来监测单个流分量的均值。我们优化了它的设计(对于流的平均值的给定偏移,最小化ARL),并将它们的ARL与为两个分量MSP设计的其他现有图表的ARL进行比较。为了进行比较,我们还需要获得这些先前图表的最佳设计,而这些图表在文献中是不可用的;这是我们工作的又一贡献。图表的ARL是通过模拟获得的,运行次数足够大,以确保精确的结果。结果表明,所提出的图表优于以前的图表,因此被推荐用于MSP的统计控制。
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引用次数: 0
Linear combination of chi-squares for multinomial process monitoring 多项式过程监控的卡方线性组合
Q3 Engineering Pub Date : 2021-07-02 DOI: 10.1590/1806-9649-2021v28e41
Ramzi Talmoudi, Ali Achouri, H. Taleb
Abstract: Marcucci (1985) proposed a chi square goodness of fit statistic based generalized p-chart for multinomial process monitoring. A chi square distribution quantile was considered as a control chart limit. A weighted chi square goodness of fit statistic-based control chart is proposed for multinomial process monitoring in this paper, where more important weights are advocated to poor quality categories. The statistic distribution is approximated by a well-known linear combination of chi squares distribution. The approximation is assessed through a simulation, an extreme percentile of the approximated distribution is used as an upper control chart limit and a comparison is carried out with a chi square goodness of fit statistic-based control chart. The average run length is used as a benchmark and the comparison is performed using simulations considering two process shifts scenarios. Under some restrictions, the weighted statistic-based control chart allows an earlier detection of process shift in case of deterioration and postpones out of control signals in case of improvement. This benefit is clearer when the process is improved by a decrease in the poor quality probability category and an increase in the best quality category probability.
摘要:Marcucci(1985)提出了一种基于卡方拟合优度统计的广义p图用于多项过程监控。卡方分布分位数被认为是控制图极限。本文提出了一种基于加权卡方拟合优度统计的多项过程监控控制图,其中对质量较差的类别赋予更重要的权重。统计分布近似于著名的卡方分布的线性组合。通过模拟评估近似,使用近似分布的极端百分位数作为控制图上限,并与基于卡方拟合优度统计的控制图进行比较。使用平均运行长度作为基准,并使用考虑两种流程转移场景的模拟进行比较。在一定的限制条件下,基于加权统计的控制图允许在恶化情况下更早地发现过程移位,并在改进情况下延迟失控信号。当过程通过减少低质量概率类别和增加最佳质量类别概率来改进时,这种好处就更明显了。
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引用次数: 0
Monitoring multinomial processes based on a weighted chi-square control chart 基于加权卡方控制图的多项过程监控
Q3 Engineering Pub Date : 2021-07-02 DOI: 10.1590/1806-9649-2021v28e43
Achouri Ali, Emira Khedhiri, Ramzi Talmoudi, H. Taleb
Abstract: Interpreting an out-of-control signal is a crucial step in monitoring categorical processes. For the Chi-Square Control Chart (CSCC), an out-of control situation does not specify if it was a process deterioration or a process improvement. For this reason, a weighted chi-square statistical control chart WSCC is proposed with different weighting categories in order to enable an accelerated disclosure of a control situation after a shift due to a deterioration of quality and on the other hand, decelerate an out of control situation after a shift due to a quality improvement. Furthermore, in comparison with Marcucci’s method, the new procedure provides an accurate and easier way to interpret several signals. In other words, the WSCC allows a faster detection of an out-of control situation in the case of a quality deterioration, however, an out-of control situation is not quickly detected in the case of a quality improvement. Indeed, comparative studies have been performed to find the best control chart for each combination. Concluding remarks with comments and recommendations are given based on Average Run Length (ARL) and standard deviation run length (SDRL).
摘要:解释失控信号是监测分类过程的关键步骤。在卡方控制图(CSCC)中,失控情况没有指明是工艺恶化还是工艺改进。为此,我们提出了加权卡方统计控制图WSCC,该加权卡方统计控制图具有不同的权重类别,一方面可以使由于质量恶化导致的换班后控制情况加速披露,另一方面可以使由于质量改善导致的换班后失控情况减速。此外,与Marcucci的方法相比,新方法提供了一种准确而简单的方法来解释几种信号。换句话说,在质量恶化的情况下,WSCC允许更快地检测到失控情况,然而,在质量改进的情况下,无法快速检测到失控情况。事实上,已经进行了比较研究,以找到每种组合的最佳控制图。根据平均运行长度(ARL)和标准偏差运行长度(SDRL)给出结论和建议。
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引用次数: 2
Criteria analysis for deciding the LTL and FTL modes of transport 确定LTL和FTL运输方式的标准分析
Q3 Engineering Pub Date : 2021-06-30 DOI: 10.1590/1806-9649-2020v28e5065
D. A. S. L. Vega, Paula Horta Lemos, J. E. A. R. D. Silva, J. Vieira
Abstract: Choosing between Less Than Truckload (LTL) and Full Truckload (FTL) is based on a multicriteria decision because it takes into account aspects such as costs and operational efficiency in transportation, handling and stock of goods. The aim of this article is to provide a detailed analysis of the criteria that comprise the LTL and FTL transport decision using a multicriteria methodology that considers decision makers´ preferences. The SMARTS method was applied in a telecommunications company that outsources its logistics operation. Results show that the main criteria for choosing LTL shipment are related to the relationship with the customer and the efficiency in the delivery of the freight (reliability of the delivery time). On the other hand, choosing FTL transport requires a high weight given to the criteria regarding benefits and cost of transit inventory. The contribution of the research is to provide a structured and flexible analysis to choose the types of shipment (FTL and FLT) when taking into account the risk aversion of decision makers using a non-optimal approach, but with approximate solutions encompassing several qualitative and quantitative criteria in this choice.
摘要:在小货车(LTL)和满载货车(FTL)之间进行选择是基于多标准的决策,因为它考虑了运输、装卸和货物库存等方面的成本和运营效率。本文的目的是使用考虑决策者偏好的多标准方法,对构成LTL和FTL运输决策的标准进行详细分析。SMARTS方法被应用于外包物流业务的电信公司。结果表明,选择LTL运输的主要标准与与客户的关系和货运交付的效率(交付时间的可靠性)有关。另一方面,选择超光速运输需要高度重视运输库存的收益和成本标准。本研究的贡献在于,当考虑到决策者使用非最优方法的风险规避时,提供了一个结构化和灵活的分析来选择运输类型(FTL和FLT),但在这种选择中包含了几个定性和定量标准的近似解决方案。
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引用次数: 1
How to fight food waste in university restaurants? 如何应对大学餐厅的食物浪费?
Q3 Engineering Pub Date : 2021-06-30 DOI: 10.1590/1806-9649-2020v28e5415
Lucas Rodrigues Deliberador, A. S. César, M. Batalha
Abstract: About one-third of the world's food production is lost or wasted annually at different stages of food supply chains (FSCs). Food loss usually occurs in the early stages of FSCs, while waste is more prevalent in their final stages. Thus, the main objectives of the present study were to investigate the causes of loss and waste, as well as strategies that can minimize them. Decreasing food waste in collective catering organizations, including university restaurants, is situated in the context of these concerns. In order to contribute to this discussion, the authors investigated the causes of wastage in university restaurants and possible interventions recommended in the literature to reduce it. A search considering the “food waste” and “university restaurant” constructs in five different databases found 352 publications related to the theme, of which 21 supported to answer the two questions that guided this search: Q1: “What are the causes that contribute to food waste in university restaurants?” and Q2: “What are the interventions that can be or are used in university restaurants to reduce food waste?” The literature search identified 13 causes (portion size; quality; price; emotion; palatability; preparation/cooking; menu; time; satiety; storage; service; overbuying; security) and 14 possible interventions (campaigns; trayless systems; waste management; portion size; quality; changing menus; planning; preordering; charity/donations; nutritional information; coercion; changing the dishes; preparation/cooking; storage). From this perspective, the present article provides a holistic view of food waste in university restaurants, in order to guide mitigation interventions and future research on this theme.
摘要:全球每年约有三分之一的粮食产量在食品供应链的不同阶段被损失或浪费。食物损失通常发生在FSCs的早期阶段,而浪费在其最后阶段更为普遍。因此,本研究的主要目的是调查损失和浪费的原因,以及可以尽量减少损失和浪费的战略。减少包括大学餐厅在内的集体餐饮组织的食物浪费,就是在这些问题的背景下进行的。为了促进这一讨论,作者调查了大学餐厅浪费的原因和文献中推荐的可能的干预措施,以减少浪费。在五个不同的数据库中搜索“食物浪费”和“大学餐厅”结构,发现352篇与该主题相关的出版物,其中21篇支持回答指导本次搜索的两个问题:第一:“大学餐厅食物浪费的原因是什么?”问题二:“大学餐厅可以或正在使用哪些干预措施来减少食物浪费?”文献检索确定了13个原因(份量大小;质量;价格;情感;适口性;准备/烹饪;菜单;时间;饱腹感;存储;服务;过多地买;安全)和14项可能的干预措施(运动;trayless系统;废物管理;部分尺寸;质量;改变菜单;规划;预订;慈善机构/捐款;营养信息;胁迫的;换盘子;准备/烹饪;存储)。从这个角度来看,本文提供了大学餐厅食物浪费的整体观点,以指导缓解干预措施和未来对这一主题的研究。
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引用次数: 3
Difficulties observed when implementing Total Productive Maintenance (TPM): empirical evidences from the manufacturing sector 实施全面生产维护(TPM)时观察到的困难:来自制造业的经验证据
Q3 Engineering Pub Date : 2021-06-01 DOI: 10.1590/1806-9649-2021v28e5300
Iara Franchi Arromba, R. Anholon, I. Rampasso, Dirceu Silva, O. Quelhas, L. A. Santa-Eulalia, W. Leal Filho
Abstract: This article analyses the difficulties observed in adopting the Total Productive Maintenance (TPM) program in production systems. The research strategies used for this purpose consisted of a literature review, a panel of experts and a survey with professionals working in manufacturing companies. Altogether, 69 market professionals took part in the survey and the collected data was analyzed through the PLS-SEM technique. Results indicate that there is a causal relationship between difficulties associated with the planning phase of a TPM program and issues associated with its implementation. This is an original research and the results are valuable to business professionals desiring to properly implement TPM, as well for researchers interested in the mechanics of total productive maintenance system’s adoption.
摘要:本文分析了在生产系统中实施全面生产维护(TPM)计划的难点。为此目的使用的研究策略包括文献综述,专家小组和对在制造公司工作的专业人员的调查。共有69名市场专业人士参与了调查,收集的数据通过PLS-SEM技术进行了分析。结果表明,与TPM计划计划阶段相关的困难与其实施相关的问题之间存在因果关系。这是一项原创研究,其结果对于希望正确实现TPM的业务专业人员以及对采用全面生产维护系统的机制感兴趣的研究人员都很有价值。
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引用次数: 4
Principal causes and challenges for reducing product returns: applying FMEA in a case study 减少产品退货的主要原因和挑战:在案例研究中应用FMEA
Q3 Engineering Pub Date : 2021-05-31 DOI: 10.1590/1806-9649-2020V28E5115
Bruna Caffaro Boccaletti, L. C. B. B. Mello, Isadora de Paula Bastos
Abstract: The current economy has demanded from organizations greater quality in their operations, which makes necessary to avoid non-compliance of processes that generate extra expenses, efforts and influence satisfaction of clients. This article aims to understand main causes of products returns from market in a cosmetics company. Based on literature review and application of a quality tool, FMEA (Failure Modes and Effects Analysis), in the case study, solutions and their effects on the organization are evaluated. After studies, new solutions and suggestions were proposed to reduce organization's post-sale reverse logistics.
摘要:当前的经济要求组织提高其运营质量,这就有必要避免不符合流程,从而产生额外的费用、努力和影响客户满意度。本文旨在了解化妆品公司产品从市场上退货的主要原因。在案例研究中,基于文献综述和质量工具FMEA(失效模式和影响分析)的应用,评估了解决方案及其对组织的影响。通过研究,提出了减少组织售后逆向物流的新解决方案和建议。
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引用次数: 1
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Gestao e Producao
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