Pub Date : 2023-06-18DOI: 10.24200/sci.2023.60313.6727
Ali Bonyadi Naeini, Hossein Gholizadeh
An integrated intelligent algorithm is proposed to optimize the reliability, maintainability, and total cost in the job shop production system. The algorithm consists of three basic modules of computer simulation. each comprising three phases of Algorithm, simulation, and Experiments/robustness validation. In the design phase, different scenarios are determined by changing parameters affecting the reliability, maintainability, and total cost. The job shop production system is simulated in the simulation phase. Then, a fuzzy simulation approach is implemented to run the simulation model for each scenario with ambiguous inputs. Accordingly, the investment cost, maintenance cost, mean time to repair (MTTR), and mean time to failure (MTTF) are obtained. Finally, the performance of different scenarios is assessed in the third module. ANN and DEA are separately used in this module and the preferred method is selected based on the robustness test and extensive sensitivity analysis. DEA and ANN are then employed to rank the design alternatives concerning the initial inputs and outputs. To show the applicability and superiority of the proposed integrated algorithm, it is applied to optimize the design of a fuzzy job shop production system consisting of five workstations.
{"title":"Concurrent Optimization of Reliability, Maintainability and Total Cost in a Job Shop Production System with Multiple Fuzzy Parameters","authors":"Ali Bonyadi Naeini, Hossein Gholizadeh","doi":"10.24200/sci.2023.60313.6727","DOIUrl":"https://doi.org/10.24200/sci.2023.60313.6727","url":null,"abstract":"An integrated intelligent algorithm is proposed to optimize the reliability, maintainability, and total cost in the job shop production system. The algorithm consists of three basic modules of computer simulation. each comprising three phases of Algorithm, simulation, and Experiments/robustness validation. In the design phase, different scenarios are determined by changing parameters affecting the reliability, maintainability, and total cost. The job shop production system is simulated in the simulation phase. Then, a fuzzy simulation approach is implemented to run the simulation model for each scenario with ambiguous inputs. Accordingly, the investment cost, maintenance cost, mean time to repair (MTTR), and mean time to failure (MTTF) are obtained. Finally, the performance of different scenarios is assessed in the third module. ANN and DEA are separately used in this module and the preferred method is selected based on the robustness test and extensive sensitivity analysis. DEA and ANN are then employed to rank the design alternatives concerning the initial inputs and outputs. To show the applicability and superiority of the proposed integrated algorithm, it is applied to optimize the design of a fuzzy job shop production system consisting of five workstations.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72493445","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}
Pub Date : 2023-06-18DOI: 10.24200/sci.2023.61224.7209
D. Güleryüz, Ö. Efe, Burak Efe
.
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{"title":"Estimation of Anthropometric Measurements Using Optimized Machine Learning Models with Bayesian Algorithm","authors":"D. Güleryüz, Ö. Efe, Burak Efe","doi":"10.24200/sci.2023.61224.7209","DOIUrl":"https://doi.org/10.24200/sci.2023.61224.7209","url":null,"abstract":".","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73875349","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}
Pub Date : 2023-06-18DOI: 10.24200/sci.2023.60381.6774
V. Chaurasiya, R. Tripathi, Ramayan Singh
: In the present research article, we address the magnetically controlled thermal and solutal Marangoni convection in the flow of self-rewetting power-law liquid over a disk, in the existence of a space dependent heat source. The self re-wetting property of fluid is modelled by considering a quadratic dependence of surface tension on temperature and species concentration. The afore-mentioned problem is modelled by simplified Navier-Stokes equations. Identifying the appropriate transform variables is essential for developing ordinary differential equations from original partial differential equations that describe the flow conditions. The resulting ordinary differential equations are solved by using the bvp 4 c routine of MATLAB and numerical solutions are presented via Graphs and tables, illustrating the impact of several factors on fluid velocity, temperature, and concentration. Computation of the quantities of physical interest such as Nusselt and Sherwood numbers are also done from those numerical solutions. One of the key findings of present research work is that the Marangoni convection works differently for pseudo-plastic fluid and dilatant fluid. On increasing thermal Marangoni convection the temperature of dilatant fluid reaches a peak value much closer to the disk than temperature of pseudo plastic fluid.
{"title":"On the solutal and thermal Marangoni convection arising in the self-rewetting fluid flow under hydromagnetic consideration","authors":"V. Chaurasiya, R. Tripathi, Ramayan Singh","doi":"10.24200/sci.2023.60381.6774","DOIUrl":"https://doi.org/10.24200/sci.2023.60381.6774","url":null,"abstract":": In the present research article, we address the magnetically controlled thermal and solutal Marangoni convection in the flow of self-rewetting power-law liquid over a disk, in the existence of a space dependent heat source. The self re-wetting property of fluid is modelled by considering a quadratic dependence of surface tension on temperature and species concentration. The afore-mentioned problem is modelled by simplified Navier-Stokes equations. Identifying the appropriate transform variables is essential for developing ordinary differential equations from original partial differential equations that describe the flow conditions. The resulting ordinary differential equations are solved by using the bvp 4 c routine of MATLAB and numerical solutions are presented via Graphs and tables, illustrating the impact of several factors on fluid velocity, temperature, and concentration. Computation of the quantities of physical interest such as Nusselt and Sherwood numbers are also done from those numerical solutions. One of the key findings of present research work is that the Marangoni convection works differently for pseudo-plastic fluid and dilatant fluid. On increasing thermal Marangoni convection the temperature of dilatant fluid reaches a peak value much closer to the disk than temperature of pseudo plastic fluid.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83519561","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}
Pub Date : 2023-06-18DOI: 10.24200/sci.2023.57472.5313
Alireza Nourbakhsh, A. Safarian, Sanaz Sadeghi
—In this paper, a new approach to optimize phase noise and Figure-of-Merit (FoM) in class-C oscillators is presented. This approach recruits DC voltage of the common source node of the switching pair transistors as an indicator to achieve the best performance of a class-C oscillator. The proposed indicator has the advantages of not introducing any loading effect to the output node, and independency from PVT changes. The method is simple and applicable to any oscillator with class-C topology, and with some modifications it would be applied to other oscillator topologies like class-B. The idea is verified using theoretical analysis, and circuit simulations on 0.18 µ m CMOS technology at 2GHz oscillation frequency. Moreover, a discrete prototype is fabricated at 15MHz and measurement results are provided which further validate feasibility of this approach.
{"title":"FoM Optimization in Class-C Oscillators","authors":"Alireza Nourbakhsh, A. Safarian, Sanaz Sadeghi","doi":"10.24200/sci.2023.57472.5313","DOIUrl":"https://doi.org/10.24200/sci.2023.57472.5313","url":null,"abstract":"—In this paper, a new approach to optimize phase noise and Figure-of-Merit (FoM) in class-C oscillators is presented. This approach recruits DC voltage of the common source node of the switching pair transistors as an indicator to achieve the best performance of a class-C oscillator. The proposed indicator has the advantages of not introducing any loading effect to the output node, and independency from PVT changes. The method is simple and applicable to any oscillator with class-C topology, and with some modifications it would be applied to other oscillator topologies like class-B. The idea is verified using theoretical analysis, and circuit simulations on 0.18 µ m CMOS technology at 2GHz oscillation frequency. Moreover, a discrete prototype is fabricated at 15MHz and measurement results are provided which further validate feasibility of this approach.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82291051","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}
Pub Date : 2023-06-18DOI: 10.24200/sci.2023.60423.6816
M. Jafari, A. Makui, A. Raisi
Firms outperforming competitors often get their success through innovation and new technological knowledge acquisition. This study offers a Three-Stage decision-making model for acquiring new technological knowledge and the optimal time to invest. In the first Stage, two competing firms decide to invest in a new technological knowledge without knowing its level. In the next stage, firms will develop and integrate it with their knowledge. Due to the uncertainty of new technological knowledge, a stochastic programming model is used to determine the optimal acquisition time. This model identifies the leader and follower by considering advantages such as branding and high market share as well as disadvantages such as high cost of uncertainty. Finally, we used Cournot and Stackelberg game to determine the winner in the market. The proposed model can be used as a decision-making tool to help organizations, in uncertainty, invest as leaders in acquiring new technological knowledge and entering the market, or wait until things are clear. The results of stochastic programing and game theory model show that the level of knowledge of firms at the time of production, knowledge absorption coefficient, and constant demand coefficient will have a special effect on determining the winner in the market
{"title":"A TWO-STAGE STOCHASTIC PROGRAMMING MODEL FOR TECHNOLOGICAL KNOWLEDGE ACQUISITION BASED ON GAME THEORY","authors":"M. Jafari, A. Makui, A. Raisi","doi":"10.24200/sci.2023.60423.6816","DOIUrl":"https://doi.org/10.24200/sci.2023.60423.6816","url":null,"abstract":"Firms outperforming competitors often get their success through innovation and new technological knowledge acquisition. This study offers a Three-Stage decision-making model for acquiring new technological knowledge and the optimal time to invest. In the first Stage, two competing firms decide to invest in a new technological knowledge without knowing its level. In the next stage, firms will develop and integrate it with their knowledge. Due to the uncertainty of new technological knowledge, a stochastic programming model is used to determine the optimal acquisition time. This model identifies the leader and follower by considering advantages such as branding and high market share as well as disadvantages such as high cost of uncertainty. Finally, we used Cournot and Stackelberg game to determine the winner in the market. The proposed model can be used as a decision-making tool to help organizations, in uncertainty, invest as leaders in acquiring new technological knowledge and entering the market, or wait until things are clear. The results of stochastic programing and game theory model show that the level of knowledge of firms at the time of production, knowledge absorption coefficient, and constant demand coefficient will have a special effect on determining the winner in the market","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89404487","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}
Pub Date : 2023-06-18DOI: 10.24200/sci.2023.60864.7028
M. N, G. Y. H., Yellamma Yellamma, Fateh Mebarek-oudina, M. Sankar
The joint influences of variable heat source patterns and temperature-reliant viscosity on the onset of convective motion in porous beds in the presence of gravity variance have been investigated. The linear analysis is performed using normal mode analysis and the Galerkin technique is applied to analyze the impact of variable heating and changeable gravity field on the behavior of system stability. The exponential temperature-dependent viscosity is considered. We examined three different types of heat source and gravity variance function combinations: Convection is accelerated by increases in viscosity and the gravity variance parameter, but decelerated by increases in the heat source strength. It has been shown that the configuration is more stable when the gravity variance and heat source functions are combined in instance (ii), but less stable when they are combined in case (iii).
{"title":"Effect of Variable Heat Source and Gravity Variance on the Convection in Porous Layer with Temperature-Dependent Viscosity","authors":"M. N, G. Y. H., Yellamma Yellamma, Fateh Mebarek-oudina, M. Sankar","doi":"10.24200/sci.2023.60864.7028","DOIUrl":"https://doi.org/10.24200/sci.2023.60864.7028","url":null,"abstract":"The joint influences of variable heat source patterns and temperature-reliant viscosity on the onset of convective motion in porous beds in the presence of gravity variance have been investigated. The linear analysis is performed using normal mode analysis and the Galerkin technique is applied to analyze the impact of variable heating and changeable gravity field on the behavior of system stability. The exponential temperature-dependent viscosity is considered. We examined three different types of heat source and gravity variance function combinations: Convection is accelerated by increases in viscosity and the gravity variance parameter, but decelerated by increases in the heat source strength. It has been shown that the configuration is more stable when the gravity variance and heat source functions are combined in instance (ii), but less stable when they are combined in case (iii).","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75079099","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}
Pub Date : 2023-06-18DOI: 10.24200/sci.2023.61412.7291
D. A, B. P
The prediction of entropy generation with a thermal and exponential space dependent heat source of unsteady flow over a rotating disk is the artifact of the paper. For the specific physical model, Oldroyd-B within fluid flow is encrypted. Also, mechanism of cobalt and tantalum nanoparticles with in the blood is employed. The proper self-similarity variables are used to convert the non-linear PDE system of equations into an ODE form, which is then calculated using the Runge–Kutta 4 th with shooting technique and artificial neural network. Visual representations are used to show how different skewing interact with each other. With a few exceptions, the research findings of the model are quite consistent with those reported in the literature. Skin frictions decrease for the parameters like radiation, Eckert number, Brinkman number and exponential based heat source. Nusselt number rises for electric and unsteady parameters. Also, entropy generation rises for magnetic field and Brinkman number whereas opposite tendency is observed for the electric field. Since cobalt stimulates red blood cell production, while tantalum is employed in bone implants and iodinated agents for blood imaging due to its long circulation time. Thus, this research may be used to treat anemia.
{"title":"Entropy optimization of non-Newtonian hybrid nanofluid flow with non-linear radiation, exponential and thermal dependent heat source: Neuro-intelligent design","authors":"D. A, B. P","doi":"10.24200/sci.2023.61412.7291","DOIUrl":"https://doi.org/10.24200/sci.2023.61412.7291","url":null,"abstract":"The prediction of entropy generation with a thermal and exponential space dependent heat source of unsteady flow over a rotating disk is the artifact of the paper. For the specific physical model, Oldroyd-B within fluid flow is encrypted. Also, mechanism of cobalt and tantalum nanoparticles with in the blood is employed. The proper self-similarity variables are used to convert the non-linear PDE system of equations into an ODE form, which is then calculated using the Runge–Kutta 4 th with shooting technique and artificial neural network. Visual representations are used to show how different skewing interact with each other. With a few exceptions, the research findings of the model are quite consistent with those reported in the literature. Skin frictions decrease for the parameters like radiation, Eckert number, Brinkman number and exponential based heat source. Nusselt number rises for electric and unsteady parameters. Also, entropy generation rises for magnetic field and Brinkman number whereas opposite tendency is observed for the electric field. Since cobalt stimulates red blood cell production, while tantalum is employed in bone implants and iodinated agents for blood imaging due to its long circulation time. Thus, this research may be used to treat anemia.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89628784","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}
Pub Date : 2023-05-30DOI: 10.24200/sci.2023.60676.6935
A. Bedram
A
一个
{"title":"A novel method (a tube with successive increase and reduction in diameter) to increase nanofluid heat transfer in a tube","authors":"A. Bedram","doi":"10.24200/sci.2023.60676.6935","DOIUrl":"https://doi.org/10.24200/sci.2023.60676.6935","url":null,"abstract":"A","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79687646","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}
Pub Date : 2023-05-30DOI: 10.24200/sci.2023.61209.7200
A. A. Ansari, Giribabu Dyanmina
{"title":"Real-Time Implementation of The Fuzzy Logic Controlled Parallel Protection Technique to Enhance the DFIG System's FRT Capability","authors":"A. A. Ansari, Giribabu Dyanmina","doi":"10.24200/sci.2023.61209.7200","DOIUrl":"https://doi.org/10.24200/sci.2023.61209.7200","url":null,"abstract":"","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72533438","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}
Pub Date : 2023-05-30DOI: 10.24200/sci.2023.59239.6130
K. Ali, Anique Ahmad, Shahzad Ahmad
Flows involving two disks have significant applications in heat exchangers, rotating machinery parts, data storage devices, oceanography and viscometers. In this investigation, heat and mass transfer characteristics are examined in Casson flow between two orthogonally moving disks, with nonlinear thermal radiation under the slip and convective conditions, using the powerful tool of similarity transformation. A MATLAB code, based on quasi-linearization, has been developed for the numerical study. It is observed that, when the disks are receding, the disk expansion ratio raises the velocity profile near the center of the region between the two disks. The trend is, however, reversed when the disks are approaching each other. Moreover, all the governing parameters remarkably elevate the fluid temperature at a central region between the disks, for both cases. A remarkable lowering in concentration distribution is also noted with the Schmidt number and the chemical reaction parameter. Finally, compared to thermal and concentration profiles, it is the velocity distribution which is least affected.
{"title":"CONVECTION DRIVEN FLOW BETWEEN MOVING DISKS- A NON-LINEAR APPROACH FOR MODELLING THERMAL RADIATION","authors":"K. Ali, Anique Ahmad, Shahzad Ahmad","doi":"10.24200/sci.2023.59239.6130","DOIUrl":"https://doi.org/10.24200/sci.2023.59239.6130","url":null,"abstract":"Flows involving two disks have significant applications in heat exchangers, rotating machinery parts, data storage devices, oceanography and viscometers. In this investigation, heat and mass transfer characteristics are examined in Casson flow between two orthogonally moving disks, with nonlinear thermal radiation under the slip and convective conditions, using the powerful tool of similarity transformation. A MATLAB code, based on quasi-linearization, has been developed for the numerical study. It is observed that, when the disks are receding, the disk expansion ratio raises the velocity profile near the center of the region between the two disks. The trend is, however, reversed when the disks are approaching each other. Moreover, all the governing parameters remarkably elevate the fluid temperature at a central region between the disks, for both cases. A remarkable lowering in concentration distribution is also noted with the Schmidt number and the chemical reaction parameter. Finally, compared to thermal and concentration profiles, it is the velocity distribution which is least affected.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90186233","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}
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