Scientia Iranica最新文献_第10页

A multi-objective three-level hierarchical hub location-queue problem with congestion and reliability under uncertainty: A case study 不确定条件下具有拥塞和可靠性的多目标三层分层集线器位置-队列问题

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-05-22 DOI: 10.24200/sci.2023.61217.7205

Vahid Yahyapour-Ganji, A. Ghodratnama, R. Tavakkoli-Moghaddam

{"title":"A multi-objective three-level hierarchical hub location-queue problem with congestion and reliability under uncertainty: A case study","authors":"Vahid Yahyapour-Ganji, A. Ghodratnama, R. Tavakkoli-Moghaddam","doi":"10.24200/sci.2023.61217.7205","DOIUrl":"https://doi.org/10.24200/sci.2023.61217.7205","url":null,"abstract":". This study investigates a three-level hierarchical hub problem considering numerous features, such as congestion and reliability. This relates to ground and air hubs as high layers in this hierarchical network. A four-objective model is presented; it lowers the number of routes, network-related costs, and hub queue waiting times while raising the network’s route reliability. Due to the impact of service time on customer satisfaction in this issue, a time frame that a penalty is assigned for the amount of delay is considered. Both the airport and the ground are hub facilities in this regard. M/M/C/K queue systems are those found in the airport and ground hubs. Due to the multi-objective nature of the problem, the LP-metric and goal attainment (GA) approaches are used to resolve it and verify multiple samples with varying weight values provided by the decision-maker. The results from the above-mentioned methods are ranked using a simple additive weighting (SAW) method. A few parameters are treated as fuzzy numbers to make the model more realistic, and the Jimenez’s model and chance-constrained programming are used to present the findings. Considering numerous weights for each objective function and solving two methods, Pareto solutions are obtained.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"53 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84825699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Entropy generation on Darcy–Forchheimer flow of Copper-Aluminium oxide/Water hybrid nanofluid over a rotating disk: Semi-analytical and numerical approaches 铜-氧化铝/水混合纳米流体在旋转圆盘上Darcy-Forchheimer流动的熵生成:半解析和数值方法

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-05-22 DOI: 10.24200/sci.2023.60134.6617

Gunisetty Ramasekhar, P. Bala, A. Reddy

{"title":"Entropy generation on Darcy–Forchheimer flow of Copper-Aluminium oxide/Water hybrid nanofluid over a rotating disk: Semi-analytical and numerical approaches","authors":"Gunisetty Ramasekhar, P. Bala, A. Reddy","doi":"10.24200/sci.2023.60134.6617","DOIUrl":"https://doi.org/10.24200/sci.2023.60134.6617","url":null,"abstract":"The proficiency of hybrid nanoparticles in increasing heat transfer has impressed many researchers to further analyze the working of those fluids. In the current study, the impact of entropy generation on electromagnetohydrodynamic (EMHD) hybrid nanofluid (copper-aluminium oxide) flow over a rotating disk in the presence of the porous medium, Darcy ‐ Forchheimer, heat generation, viscous dissipation, and thermal radiation. By applying the self-similarity variables, the partial differential equations are converted into ordinary differential equations. After that, the dimensionless equations are numerically solved by using the Runge-Kutta technique, and also the comparison is done between the numerical technique (R-K method) and the homotopy perturbation method (HPM) where HPM yields a more effective and dependable conclusion. To highlight their physical significance, unique characteristic graphs are shown for the profiles of velocity, temperature, entropy generation, and bejan number along with a suitable explanation. The hybrid nanofluid velocity decreases with larger values of the magnetic parameter, but the velocity profile increases with the higher electric field. The findings are novel and innovative, with several modern industrial applications and the results are in excellent concurrence with the relevant literature. Applications of the current research are refrigeration, electronics, heat exchangers, and lubricants.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"52 6","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72412682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A new application of multi-criteria decision-making methods for the scheduling of flexible manufacturing systems: A case study 多准则决策方法在柔性制造系统调度中的新应用:一个案例研究

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-05-22 DOI: 10.24200/sci.2023.60125.6608

Z. Mohammadnazari, R. Tavakkoli-Moghaddam, M. Alipour-Vaezi

{"title":"A new application of multi-criteria decision-making methods for the scheduling of flexible manufacturing systems: A case study","authors":"Z. Mohammadnazari, R. Tavakkoli-Moghaddam, M. Alipour-Vaezi","doi":"10.24200/sci.2023.60125.6608","DOIUrl":"https://doi.org/10.24200/sci.2023.60125.6608","url":null,"abstract":". With the growing use of flexible manufacturing systems (FMSs), it became more important to optimize them. Scheduling is one of the critical problems in FMS optimization. This study presents a new application of multi-criterion decision-making (MCDM) methods for scheduling problems of automated guided vehicles (AGVs). Designation of AGVs to job shops is the major concern of this study. The research methodology consists of two steps. We first identify the criteria for finding the importance of jobs and then apply several MCDM methods (i.e., TOPSIS, VIKOR, and PROMRTHEE) to assign AGVs to the jobs. At last, we highlight the scheduling plan for AGVs using the mathematical formulation. This paper can bring some managerial insights not only for those who use an FMS but also for anyone who is working in the field of smart management. By the scrutiny, we highlight that the travel distance is significantly correlated with utilities. In other words, the more important are the jobs, the less distance is between jobs and AGVs. The findings support the minimization premise of the travel by AGVs and utility maximization of sending AGVs to the jobs simultaneously. This is achieved through assignment of two AGVs to seven jobs for multiple periods.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"7 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82342768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A resilient closed-loop supply chain network design through integrated sourcing and pricing strategies 通过整合采购和定价策略设计一个弹性闭环供应链网络

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-05-14 DOI: 10.24200/sci.2023.59944.6508

M. Farrokh, Reza Yousefi-Zenouz, Aboozar Jamalnia

引用次数: 0

PEBA/Na-X Multilayer Hybrid Membrane for CO2 Separation: Influence of Na-X Zeolite Layer Synthesis Condition 用于CO2分离的PEBA/Na-X多层杂化膜:Na-X沸石层合成条件的影响

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-05-10 DOI: 10.24200/sci.2023.60369.6762

M. Vaezi, H. Bagheri

{"title":"PEBA/Na-X Multilayer Hybrid Membrane for CO2 Separation: Influence of Na-X Zeolite Layer Synthesis Condition","authors":"M. Vaezi, H. Bagheri","doi":"10.24200/sci.2023.60369.6762","DOIUrl":"https://doi.org/10.24200/sci.2023.60369.6762","url":null,"abstract":"The effects of synthesis time and the number of synthesis layers were investigated on the synthesis of Na-X zeolite sublayer for fabricating a PEBA/Na-X hybrid membrane. The CO 2 /N 2 separation was considered as the objective function to obtain an effective Na-X sublayer. SEM and AFM studies of the synthesized sublayers reveal that 6 hour synthesis time and one synthesis layer give an Na-X sublayer (ZSL6-1) with sub-micron thickness (< 1µm), and roughness of 13 nm. The N 2 permeation ( 11900 GPU) shows the low mass transfer resistance through the ZSL6-1 sublayer. The ZSL6-1 sublayer in the hybrid structure of the membrane leads to the high stability of the multilayer structure via the anchoring effect of the polymer. Hydroxyl groups, along with positive and negative charges on the surface of the Na-X sublayer, cause to strong bonding of the polymer layer and prevent its delamination. The surface coverage of the sublayer by polymer has increased the mass transfer resistance just for N 2 and increase the perm-selectivity. These properties, along with the high affinity of the Na-X to the adsorption of CO 2 , results in a 56% increase in the perm-selectivity of CO 2 /N 2 ( ~ 70 ) compared to net PEBA ( ~ 40-50 ) and the recently reported hybrid membranes.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"17 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91074268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of a Hybrid Credit Scoring Model for the Banking System 银行系统混合信用评分模型的开发

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-05-10 DOI: 10.24200/sci.2023.60399.6778

M. Rastegar, Mitra Faraji

{"title":"Development of a Hybrid Credit Scoring Model for the Banking System","authors":"M. Rastegar, Mitra Faraji","doi":"10.24200/sci.2023.60399.6778","DOIUrl":"https://doi.org/10.24200/sci.2023.60399.6778","url":null,"abstract":"The banking system tend to internalize scoring according to Basel II & III and their Central Bank regulations. Consequently, these banking systems are in dire need of credit scoring models. In this study, first, we present a probabilistic neural network (PNN) algorithm for credit scoring of bank customers optimized by means of a genetic algorithm. Based on data from legal customers of one Iranian bank, its performance is compared with seven common machine-learning algorithms. Then we developed a new hybrid performance metric, called probabilities of credit scoring correctness, by combining several performance metrics. The banking system has proposed several credit-scoring models. Models such as single classifiers, hybrid models, and ensemble models determine the class of customers (good or bad). In order to calculate the expected loss and unexpected loss, banks need the probability of default. In general, the proposed model can utilize m performance metrics and n classifiers; the larger m and n , the more reliable the customer class estimates will be. In fact, the purpose of this paper is to create a hybrid approach for credit scoring Iranian banks' clients, thus obtaining the probability of default and credit risk models for the banking system, especially the weak banking system.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"20 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84280561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Application of simulated annealing algorithm for multi criteria operation planning in flexible manufacturing systems 模拟退火算法在柔性制造系统多准则作业规划中的应用

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-05-10 DOI: 10.24200/sci.2023.58148.5589

Mohammad Tavakkoli Nabavi, Masoud Azadi Moghaddam, F. Kolahan

{"title":"Application of simulated annealing algorithm for multi criteria operation planning in flexible manufacturing systems","authors":"Mohammad Tavakkoli Nabavi, Masoud Azadi Moghaddam, F. Kolahan","doi":"10.24200/sci.2023.58148.5589","DOIUrl":"https://doi.org/10.24200/sci.2023.58148.5589","url":null,"abstract":". This paper considers a multi-objective model in which operation planning and tool assignment are simultaneously in a Flexible Manufacturing System (FMS). In this regard, the main characteristics of FMS have been analyzed. Then, a comprehensive model, including major system parameters and cost components, has been designed and presented. The proposed model contains cost factors, including machining cost, earliness or tardiness penalties, tool and part movement or switch costs, and idle time costs of tools and machines. Then, a multi-objective model for the problem has been proposed, in which the relative importance of each cost through weighting these costs based on the decision-making goals and the sum of the mentioned costs have been considered simultaneously. Based on the complex nature of the problem, standard solution techniques have yet to be employed. Therefore, to reduce computational times, the Simulated Annealing (SA) algorithm has been used for about 30 minutes (10,000 movements). The total production costs have been decreased from 7,000 to 4333 units using the SA algorithm. Based on the results, a 38% reduction in total production costs has been achieved. Computational results revealed that the proposed method is quite e(cid:14)cient in the multi-objective optimization of FMS within a short computational","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"30 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76353144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mathematical Programming and Metaheuristics for Solving Continuous-Time Scheduling Optimization Problems in Low-Volume Low-Variety Production Systems 求解小批量低品种生产系统连续时间调度优化问题的数学规划与元启发式

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-05-10 DOI: 10.24200/sci.2023.59998.6542

Arya Russel, S. Taghipour, M. Sharifi

引用次数: 0

Dynamic modeling of the extended mobile robot: Composed N parallel axles, suspension system, and wheels slippage 扩展移动机器人的动力学建模:由N平行轴、悬挂系统和车轮滑移组成

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-05-10 DOI: 10.24200/sci.2023.56722.4874

Scientia Iranica, M. H. Korayem, S. F. Dehkordi, M. Aghajari

{"title":"Dynamic modeling of the extended mobile robot: Composed N parallel axles, suspension system, and wheels slippage","authors":"Scientia Iranica, M. H. Korayem, S. F. Dehkordi, M. Aghajari","doi":"10.24200/sci.2023.56722.4874","DOIUrl":"https://doi.org/10.24200/sci.2023.56722.4874","url":null,"abstract":". In this study, the new mobile robot structure with N parallel axles was designed and developed, as well as its motion equations derived. It uses several parallel axes, which increase its mobility at di(cid:11)erent surface conditions compared to similar ones. The number of parallel axes in such robotic systems makes studies of the e(cid:11)ect of slip mandatory due to the increase in the wheels’ contact area. These e(cid:11)ects make a di(cid:11)erence in the mobile robot kinematic constraints equations. On the other hand, added parallel axels prepare the capability for motion on rough and uneven surfaces. But the mobile platform requires a suspension system to reduce the e(cid:11)ects of oscillations due to the (cid:13)oor. Finally, the dynamics model of a mobile robot obtains by considering the e(cid:11)ect of wheels’ slips, suspension, and parallel axles using Lagrange equations. The concluded model is simulated for a two-axis mobile robot with four wheels in di(cid:11)erent surface conditions. It can be seen that the deviation of the robot is eminent, besides that the wheel’s slips a(cid:11)ect the system performance based on the (cid:13)oor conditions. Consequently, the robot deviation on ice is less than that on loose gravel","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"14 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87719362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

QQCAsim: a new simulation tool for quaternary logic in QCA technology QQCAsim: QCA技术中新的四元逻辑仿真工具

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-05-10 DOI: 10.24200/sci.2023.60421.6789

Mohammad Amin Mianroodi, Reza Akbari-Hasanjani, R. Sabbaghi‐Nadooshan

引用次数: 0