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Stochastic analysis of k-out-of-n: G type of repairable system in combination of subsystems with controllers and multi repair approach 带控制器子系统组合的n:G型可修系统的随机分析及多重修复方法
Q2 Engineering Pub Date : 2021-09-12 DOI: 10.22094/JOIE.2021.1906935.1780
V. V. Singh, P. K. Poonia
This paper describes the investigation of different reliability measures of a complex system consisting of two subsystems with controllers in a series configuration, which is a useful opportunity for specific design problems. Subsystem-1 consisting n units functioning under the policy k-out-of-n: G; policy, and subsystem-2 has m units and operating under r-out-of-m: G; policy. The system failure rates of both subsystems are constant and assumed to obey an exponential distribution; two types of distribution are allowed to repair: general distribution and Gumbel-Hougaard family copula distribution. The system's partially failed states/ completely failed states are repaired using General/ copula distribution. After repair, the units in both the subsystems are "as good as new." The controller control both subsystems and the failure of controllers brings the subsystem in the complete failed state. The operator may fail the system deliberately if not satisfied with the organization. The system is analyzed employing the supplementary variable technique, and Laplace transforms implications and traditional system reliability measures, such as the system's availability, system reliability, and profit analysis, have been computed for particular values of failure and repair parameters.
本文描述了对由两个子系统组成的复杂系统的不同可靠性措施的研究,该系统具有串联配置的控制器,这对于特定的设计问题是一个有用的机会。子系统-1,由n个单元组成,按照策略k-out-of-n:G运行;策略,并且子系统-2具有m个单元并且在m:G中的r-下操作;政策两个子系统的系统故障率是恒定的,并假设服从指数分布;允许修复两种类型的分布:一般分布和Gumbel-Hougaard家族copula分布。系统的部分故障状态/完全故障状态使用General/compla分布进行修复。修复后,两个子系统中的单元都“像新的一样”。控制器控制两个子系统,控制器的故障使子系统处于完全故障状态。如果操作员对组织不满意,可能会故意使系统失效。采用补充变量技术对系统进行了分析,并针对故障和修复参数的特定值计算了拉普拉斯变换含义和传统的系统可靠性度量,如系统的可用性、系统可靠性和利润分析。
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引用次数: 3
Developing a transfer point location problem considering normal demands distribution 考虑正态需求分布的转运点选址问题
Q2 Engineering Pub Date : 2021-09-12 DOI: 10.22094/JOIE.2021.1873323.1670
S. A. Darestani, Mollaie Ammar, Deneise Dadd
In the scope of center location problem, transfer point location problems (TPLP) are the ones which have been studied more recently to make models more applicable in real world. The contribution of this work is to develop a model in which demand points are weighted and have a normal distribution. As an assumption, there is no transformation directly from a demand point to the service facility location. This means that the transfer point is always engaged. The contribution of work is summarized in two models. In the first model, all the points are considered in an area while in the second one the points are considered in several areas. The problem is to find out the best location for the transfer point so that the maximum expected weighted distance to all demand points through the transfer point is minimized. A mathematical solution is employed when demand points follow normal distribution, with some points of demands being in regions. Then, this model was solved by replacing real number in a real condition. We used Maple software to solve this objective function as well as MATLAB software to solve this model numerically.
在中心定位问题中,转移点定位问题(TPLP)是近年来为使模型更适用于现实世界而进行的研究。这项工作的贡献是开发了一个模型,其中需求点被加权并具有正态分布。作为一种假设,不存在从需求点到服务设施位置的直接转换。这意味着转换点始终处于接合状态。工作的贡献总结为两个模式。在第一个模型中,所有的点都被考虑在一个区域中,而在第二个模型中这些点被考虑在几个区域中。问题是找出转移点的最佳位置,从而最小化通过转移点到所有需求点的最大期望加权距离。当需求点服从正态分布时,使用数学解,其中一些需求点位于区域中。然后,通过在真实条件下替换实数来求解该模型。我们使用Maple软件求解该目标函数,并使用MATLAB软件对该模型进行数值求解。
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引用次数: 0
Analysis of Causal Relationships Effective Factors on the Green Supplier Selection in Health Centers Using the Intuitionistic Fuzzy Cognitive Map (IFCM) Method 基于直觉模糊认知图(IFCM)方法的卫生中心绿色供应商选择因果关系及影响因素分析
Q2 Engineering Pub Date : 2021-09-02 DOI: 10.22094/JOIE.2021.1899316.1746
H. S. Tooranloo, Salim Karimi Takalo, Fatemeh Mohyadini
The healthcare sector is one of the largest service industries with the highest potential to improve environmental performance. Hospitals as an important part of the healthcare system must act in a way that reduces their environmental consequences, which requires having a green supplier. The aim of this study was to identify the effective factors on the green supplier selection (GSS) in the hospital and to present an excellent model for analyzing the relationships between these factors. In this study, 14 concepts that effect the green supplier selection of a hospital have been extracted from in-depth literature and interviews entailing: financial capability, creativity and innovation, green technology, flexibility, organizational capability, commitment, trust on supplier, green quality, green transportation, environmental cooperation with customers, hazardous materials management, buy green, green warehouse and green packaging.In addition Intuitive fuzzy cognitive mapping approach was also used for data analysis and conclusion. The results showed that green technology index with 0.43 degree was the most influential and organizational capability index with 0.29 degree had the most influence over the other concepts. In addition, focusing on concepts like financial capability, trust on supplier and creativity and innovation process of green supplier selection of hospital. Taking these in consideration these factors should be given specific attention.
医疗保健行业是最大的服务业之一,在改善环境绩效方面潜力最大。医院作为医疗系统的重要组成部分,必须以减少其环境后果的方式行事,这需要有一个绿色供应商。本研究的目的是确定医院绿色供应商选择的有效因素,并为分析这些因素之间的关系提供一个良好的模型。本研究从深入的文献和访谈中提取了影响医院绿色供应商选择的14个概念:财务能力、创造力和创新力、绿色技术、灵活性、组织能力、承诺、对供应商的信任、绿色质量、绿色交通、与客户的环境合作,危险品管理,购买绿色、绿色仓库和绿色包装。此外,还采用直觉模糊认知映射方法进行数据分析和结论。结果表明,0.43度的绿色技术指数影响最大,0.29度的组织能力指数影响最大。此外,重点关注财务能力、对供应商的信任以及医院绿色供应商选择的创造力和创新过程等概念。考虑到这些因素,应该特别注意这些因素。
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引用次数: 0
A bi-objective non-linear approach for determining the ordering strategy for group B in ABC analysis inventory ABC分析库存中确定B组订货策略的双目标非线性方法
Q2 Engineering Pub Date : 2021-09-02 DOI: 10.22094/JOIE.2021.1864151.1634
Fatemeh Keshavarz-Ghorbani, S. Pasandideh
The main aim of this research is to find the best inventory review policy for different types of items in group B in ABC analysis through minimizing the total cost of the system and maximizing the service level. Moreover, this study has considered several operational constraints such as limitations on storage space, number of orders, and allowable shortage. To solve this problem, first, an individual optimization method is utilized to obtain optimal solutions. Then, two classic and novel multi-objective optimization methods have been used to convert the bi-objective problem to a single-objective and reach the near-optimal solutions for both objectives simultaneously. Finally, the proposed methods are compared in terms of objective function values and computational time to find the better method.
本研究的主要目的是通过最小化系统总成本和最大化服务水平,找到ABC分析中B组不同类型物品的最佳库存审核策略。此外,本研究还考虑了一些操作约束,如存储空间限制、订单数量和允许短缺。为了解决这一问题,首先利用个体优化方法获得最优解。然后,利用两种经典的和新颖的多目标优化方法将双目标问题转化为单目标问题,并同时达到两个目标的近最优解。最后,从目标函数值和计算时间两方面对所提方法进行了比较,以找到更好的方法。
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引用次数: 1
Optimization of Inventory Controlling System Using Integrated Seasonal forecasting and Integer Programming 基于季节预测和整数规划的库存控制系统优化
Q2 Engineering Pub Date : 2021-08-15 DOI: 10.22094/JOIE.2021.1895036.1732
Hagazi Abrha Heniey, K. Gebrehiwot, Tsegay Berhe Desta, Leake Weleabzgi Gebrehiwot
Ethiopia's industrial development strategy is characterized by manufacturing-led and expansion labor-intensive industrialization. The country expects to generate more income from the exported market. However, the case company is still known not to become productive as much as possible due to different reasons. One of the big challenges of the company has the problem with holding inappropriate inventory and with determines their optimal cost due to poor production planning. So that to solve this problem objective of the paper is to minimize total cost through the integration of seasonal forecasting and integer programming model without violating demand fulfillments. This technique improves resource utilization and enhances inventory control or stock control system. Currently, the company produces different kinds of products grouped into four common types of products (knitted garment, knitted fabric, woven garment, and woven fabric). The data survey system was both primary and secondary system and classified the products using A B C (always better classification) classification. The optimal solution was settled through the integration of seasonal forecasting and integer programming. As the Sensitivity analysis indicated the a big gap between production capacity and actual demand of the products. As the optimized solution indicated that total cost of production cost and inventory cost was minimized and the optimal production plan as well safety stock levels in each quarter was settled. Seasonal demand forecasting is a key activity for a garment which more or less controls all activities of production processes since garment products are affected by seasonal. As the result and discussion have shown that after optimized increase profit of the company through minimizing production cost and inventory costs since both costs are the big constraint of the company. Based on the optimized solution finding annually total cost needs for each A, B, and C – categories products are 57,225,920 BIRR 4,733,013 BIRR, 8,229,309 BIRR, respectively for production and inventory costs. The optimized solution indicated that if the company implemented exactly the proposed solution it will get an additional,4,219,788.8 BIRR,772,055.8 BIRR,2,119,824.2 BIRR respectively for A, B, C categories products totally around 7,111,668.8 BIRR profit per year will get. To end, it was concluded that this remarkable profit increment of the case company can certainly enhance its productivity and worldwide competitiveness. This research will create further pathways for other researchers to accomplish substantial studies on other garment sectors or other manufacturing industries based on local and international perspectives.
埃塞俄比亚的工业发展战略的特点是制造业主导和扩大劳动密集型工业化。该国预计将从出口市场获得更多收入。然而,由于不同的原因,该案例公司仍然没有尽可能提高生产力。该公司面临的一大挑战是持有不适当的库存,以及由于生产计划不佳而确定最佳成本的问题。因此,为了解决这一问题,本文的目标是在不影响需求满足的情况下,通过季节预测和整数规划模型的集成,使总成本最小化。该技术提高了资源利用率,并增强了库存控制或库存控制系统。目前,该公司生产不同种类的产品,分为四种常见的产品(针织服装、针织面料、机织服装和机织面料)。数据调查系统是一级和二级系统,使用A B C(总是更好的分类)分类对产品进行分类。通过季节预报和整数规划相结合的方法,确定了最优解。敏感性分析表明,该产品的生产能力与实际需求之间存在很大差距。优化方案表明,生产成本和库存成本的总成本最小化,并确定了每个季度的最佳生产计划和安全库存水平。季节性需求预测是服装的一项关键活动,它或多或少地控制着生产过程的所有活动,因为服装产品受到季节性的影响。结果和讨论表明,优化后通过最小化生产成本和库存成本来增加公司利润,因为这两种成本都是公司的最大约束。根据优化的解决方案,每个A、B和C类产品的年度总成本需求分别为57225920 BIRR 4733013 BIRR和8229309 BIRR,用于生产和库存成本。优化后的解决方案表明,如果该公司完全实施了所提出的解决方案,则A、B、C类产品将分别获得4219788.8 BIRR、772055.8 BIRR和2119824.2 BIRR,每年的利润总额约为7111668.8 BIRR。最后得出结论,案例公司的这一显著利润增长肯定可以提高其生产力和全球竞争力。这项研究将为其他研究人员创造进一步的途径,以基于当地和国际视角对其他服装行业或其他制造业进行实质性研究。
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引用次数: 0
Design of Accelerated Life Testing Plans for Products Exposed to Random Usage 随机使用产品的加速寿命试验计划设计
Q2 Engineering Pub Date : 2021-07-01 DOI: 10.22094/JOIE.2020.1907303.1783
Kamyar Sabri-Laghaie, R. Noorossana
Accelerated Life Testing (ALT) is very important in evaluating the reliability of highly reliable products. According to ALT procedure, products undergo higher stress levels than normal conditions to reduce the failure times. ALTs have been studied for various conditions and stresses. In addition to common stress such as temperature and humidity, random usage can also be considered as another stress that can cause failure. Design of ALT plan for products which are exposed to random usage process have not been studied in the literature. Therefore, a procedure for designing ALT plan for these products is studied in this paper. To do so, hazard rate of products is formulated based on the random usage process and other stresses. Then, the variance of the hazard rate is estimated over a predetermined time period. Optimum stress levels and the number of units at every stress level are obtained by numerically minimizing the variance of the hazard rate estimate. Numerical example and sensitivity analysis are performed to show the application and robustness of the model to parameter deviations. The results show that the proposed procedure is robust to parameter changes and can be used for ALT planning of products under random usage.
加速寿命测试(ALT)在评估高可靠性产品的可靠性方面非常重要。根据ALT程序,产品承受比正常条件更高的应力水平,以减少故障次数。已经对各种条件和应力下的ALT进行了研究。除了温度和湿度等常见应力外,随机使用也可以被视为另一种可能导致故障的应力。文献中尚未对暴露于随机使用过程中的产品的ALT计划的设计进行研究。因此,本文研究了为这些产品设计ALT计划的程序。为此,产品的危险率是根据随机使用过程和其他应力制定的。然后,在预定的时间段内估计危险率的方差。通过数值最小化危险率估计的方差,可以获得最佳应力水平和每个应力水平下的单元数量。通过算例和灵敏度分析,说明了该模型的适用性和对参数偏差的鲁棒性。结果表明,该方法对参数变化具有鲁棒性,可用于随机使用下产品的ALT规划。
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引用次数: 2
Productivity Improvement of BOB T-shirt through Line Balancing Using Control Limit analysis and discrete event simulation (Case study: - MAA Garment and Textile Factory) 通过控制极限分析和离散事件模拟的线平衡提高BOB T恤的生产率(案例研究:MAA服装纺织厂)
Q2 Engineering Pub Date : 2021-07-01 DOI: 10.22094/JOIE.2020.561766.1545
A. Yemane
This study deals with line balancing of BOB T-shirt model with the help of control limit analysis and discrete event simulation of the assembly lines. In this study control limit analysis is used to measure the performance of the assembly line and used to show the bottleneck operations of the assembly line and line balancing technique improves the productivity of the sewing line of the model. BOB T-shirt model has 16 main operations and each operation’s time is analyzed as standard minute value (SMV). The main bottleneck operations are analyzed using the control limit analysis and simulation modeling. Based on the SMV of each operation, those operations which are out of lower control limit and upper control limit is called us bottlenecks of the sewing lines of the garment section and the 1st bottleneck operation is tread trimming operation. When we apply control limit analysis and discrete event simulation technique for the line balancing; the daily output has been increased from 1032 pieces to 1289 pieces. And labor productivity and machine productivity are increased from 46.9 and 54.32 to 58.59 and 71.61 respectively. And then finally, the profit that the line generated also increased from 22704 to 28358birr.
利用控制极限分析和装配线离散事件仿真,研究了BOB t恤模型的生产线平衡问题。在本研究中,采用控制极限分析来衡量装配线的性能,并使用控制极限分析来显示装配线的瓶颈操作和生产线平衡技术提高了模型缝纫线的生产率。BOB t恤模型有16个主要工序,每个工序的时间用标准分值(SMV)进行分析。利用控制极限分析和仿真建模对主要瓶颈操作进行了分析。根据各工序的SMV,将超出控制下限和控制上限的工序称为制衣段缝纫线的瓶颈工序,第一个瓶颈工序为修整踏面工序。当采用控制极限分析和离散事件仿真技术进行线路平衡时;日产量从1032件增加到1289件。劳动生产率和机器生产率分别从46.9和54.32提高到58.59和71.61。最后,这条线产生的利润也从22704美元增加到28358美元。
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引用次数: 2
A hybrid model based on machine learning and genetic algorithm for detecting fraud in financial statements 基于机器学习和遗传算法的财务报表舞弊检测混合模型
Q2 Engineering Pub Date : 2021-07-01 DOI: 10.22094/JOIE.2020.1877455.1685
Akbar Javadian Kootanaee, Abbas Ali Poor Aghajan, M. H. Shirvani
Financial statement fraud has increasingly become a serious problem for business, government, and investors. In fact, this threatens the reliability of capital markets, corporate heads, and even the audit profession. Auditors in particular face their apparent inability to detect large-scale fraud, and there are various ways to identify this problem. In order to identify this problem, the majority of the proposed methods are based on existing algorithms and have only attempted to identify human or simple data mining methods that have high overhead and are also costly. The data mining methods presented so far have had high computational overhead or low accuracy. The purpose of this study is to present a model in which an improved ID3 decision tree with a support vector machine is used as a hybrid approach and also to improve the performance and accuracy, genetic algorithm and multilayer perceptron neural networks are applied. More efficient feature selection has been used to reduce computational overhead. The tree proposed in the proposed method has the lowest depth possible and therefore has high velocity and low computational overhead. For this purpose, the financial statements of 151 listed companies in Tehran Stock Exchange during 2014-2015 were surveyed and 125 financial ratios were extracted using ANOVA test, 23 fraud related ratios were selected as model input data. The proposed model has a high accuracy of about 80% of prediction accuracy compared to similar models.
财务报表舞弊已日益成为企业、政府和投资者面临的严重问题。事实上,这威胁到资本市场、企业负责人甚至审计行业的可靠性。审计人员尤其面临着明显无法发现大规模欺诈的问题,有多种方法可以识别这一问题。为了识别这个问题,大多数提出的方法都是基于现有算法的,并且只试图识别人工或简单的数据挖掘方法,这些方法开销高,成本也很高。迄今为止提出的数据挖掘方法具有较高的计算开销或较低的准确性。本研究的目的是提出一个模型,其中使用带有支持向量机的改进ID3决策树作为混合方法,并应用遗传算法和多层感知器神经网络来提高性能和准确性。已经使用了更有效的特征选择来减少计算开销。在所提出的方法中提出的树具有尽可能低的深度,因此具有高速度和低计算开销。为此,对德黑兰证券交易所151家上市公司2014-2015年的财务报表进行了调查,并使用ANOVA检验提取了125个财务比率,选择了23个欺诈相关比率作为模型输入数据。与类似模型相比,所提出的模型具有约80%的预测精度的高精度。
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引用次数: 15
Relationship between Business Intelligence Components and Financial Reporting Quality in Firms 企业商业智能组件与财务报告质量的关系
Q2 Engineering Pub Date : 2021-07-01 DOI: 10.22094/JOIE.2020.575354.1585
H. Ahmadi, H. Valipour, Golamreza Jamali
The purpose of this research studies the impact of business intelligence on the financial reporting quality of listed companies in the Tehran Stock Exchange using structural equation modeling. The instruments of this research were the business Intelligence Questionnaire (Provich, 2012) and the financial statements of listed companies in The Tehran Stock Exchange to study of the financial reporting quality. For this purpose, the data of 182 listed companies in the Tehran Stock Exchange in 2018 was collected and processed. To analyze the data, Partial Least Squares Method and PLS-3 software were used. The findings of the research showed that each of the components of business intelligence including data integrity, analytical capabilities, information content quality, information access quality, use of information in business process, and Analytical decision - making culture has a positive and significant effect on the financial reporting quality
本研究的目的是利用结构方程模型研究商业智能对德黑兰证券交易所上市公司财务报告质量的影响。本研究的工具是商业智能问卷(Provich, 2012)和德黑兰证券交易所上市公司的财务报表,以研究财务报告质量。为此,收集并处理了德黑兰证券交易所2018年182家上市公司的数据。采用偏最小二乘法和PLS-3软件对数据进行分析。研究结果表明,商业智能的每一个组成部分,包括数据完整性、分析能力、信息内容质量、信息访问质量、业务流程中的信息使用和分析决策文化,对财务报告质量都有积极而显著的影响
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引用次数: 0
A Fractile Model for Stochastic Interval Linear Programming Problems 随机区间线性规划问题的分形模型
Q2 Engineering Pub Date : 2021-07-01 DOI: 10.22094/JOIE.2021.566423.1558
H. Nasseri, S. Bavandi
In this paper, we first introduce a new category of mathematical programming where the problem coefficients are interval random variables. These problems include two different kinds of ambiguity in the problem coefficients which are being interval and being random. We use Fractile method to solve these problems. In this method, using the existing method, we change the interval problem coefficients to random mode and then we solve the random problem using Fractile method. Also, a numerical example is presented to show the effectiveness of this model. Finally, we emphasize that this approach can be useful for the model with multi-objective as a generalized model in the future study.
在本文中,我们首先介绍了一类新的数学规划,其中问题系数是区间随机变量。这些问题包括问题系数中的两种不同类型的模糊性,即区间模糊性和随机模糊性。我们使用Fractile方法来解决这些问题。在该方法中,我们使用现有的方法,将区间问题的系数改为随机模式,然后使用分形方法来解决随机问题。通过算例验证了该模型的有效性。最后,我们强调,这种方法可以用于多目标模型作为未来研究中的广义模型。
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引用次数: 0
期刊
Journal of Optimization in Industrial Engineering
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