Pub Date : 2023-08-16DOI: 10.24200/sci.2023.61143.7165
A. Ashouri-Zadeh, Z. Nasiri-Gheidari
This paper presents some novel force ripple reducing techniques for tubular permanentmagnetlinear machines (TPMLMs) with the square-shaped cross section. These methods are verystraightforward, so their implementation in TPMLMs with the square cross section is easy. Ananalytical form of machine parameters such as the thrust force is obtained by solving the analyticalfield. A modular configuration for permanent-magnet pole is used to reduce teeth coggingforce. Furthermore, the manufacturing cost of TPMLMs can be reduced by using modular polepermanent-magnet. In this method, the width of permanent-magnets (PMs) is calculated by usingFourier analysis and a sensitivity analysis has been conducted to identify the robustness of thistechnique. Additional stator side methods are used to decrease the end face cogging force. Moreover,the stator teeth shifting method is proposed to reduce the electromagnetic force ripples. Also,the produced electromagnetic force of the machine is increased by using a delay in the power supply.3 -D non-linear finite-element analyses and experimental tests are performed to investigatethe effectiveness and performance of proposed techniques.
{"title":"Force Ripple Reduction Methods for Tubular Permanent Magnet Linear Machines","authors":"A. Ashouri-Zadeh, Z. Nasiri-Gheidari","doi":"10.24200/sci.2023.61143.7165","DOIUrl":"https://doi.org/10.24200/sci.2023.61143.7165","url":null,"abstract":"This paper presents some novel force ripple reducing techniques for tubular permanentmagnetlinear machines (TPMLMs) with the square-shaped cross section. These methods are verystraightforward, so their implementation in TPMLMs with the square cross section is easy. Ananalytical form of machine parameters such as the thrust force is obtained by solving the analyticalfield. A modular configuration for permanent-magnet pole is used to reduce teeth coggingforce. Furthermore, the manufacturing cost of TPMLMs can be reduced by using modular polepermanent-magnet. In this method, the width of permanent-magnets (PMs) is calculated by usingFourier analysis and a sensitivity analysis has been conducted to identify the robustness of thistechnique. Additional stator side methods are used to decrease the end face cogging force. Moreover,the stator teeth shifting method is proposed to reduce the electromagnetic force ripples. Also,the produced electromagnetic force of the machine is increased by using a delay in the power supply.3 -D non-linear finite-element analyses and experimental tests are performed to investigatethe effectiveness and performance of proposed techniques.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135022830","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 : 2023-08-08DOI: 10.24200/sci.2023.58266.5647
M. Shiravi, B. Ganji
Nowadays, Halbach magnets serve different purposes in electrical machine designs by offering different structures. These structures can be used to shim (improve the inhomogeneity) of new static fields in the magnetic resonance imaging (MRI) system. The shimming method proposed here uses axial and radial Halbach arrays. The inhomogeneity and average field is obtained at a constant diameter of spherical volume. Using the FE Maxwell software, different topologies are evaluated and the best structure is then selected and optimized. The optimum structure is manufactured and all issues related to the construction are explained in details. Comparison between simulation and experimental results shows the effectiveness of the proposed idea.
{"title":"Introducing a new shimming method based on combination of axial and radial Halbach arrays to have a uniform flux density for a low-field portable MRI system","authors":"M. Shiravi, B. Ganji","doi":"10.24200/sci.2023.58266.5647","DOIUrl":"https://doi.org/10.24200/sci.2023.58266.5647","url":null,"abstract":"Nowadays, Halbach magnets serve different purposes in electrical machine designs by offering different structures. These structures can be used to shim (improve the inhomogeneity) of new static fields in the magnetic resonance imaging (MRI) system. The shimming method proposed here uses axial and radial Halbach arrays. The inhomogeneity and average field is obtained at a constant diameter of spherical volume. Using the FE Maxwell software, different topologies are evaluated and the best structure is then selected and optimized. The optimum structure is manufactured and all issues related to the construction are explained in details. Comparison between simulation and experimental results shows the effectiveness of the proposed idea.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135841569","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 : 2023-08-08DOI: 10.24200/sci.2023.54718.3884
Sharmin Moosavi, Mojtaba Vahidi-Asl, Hassan Haghighi, Mohammad Rezaalipour
To address the problems of automatic repair techniques, we present Doctor Code, a new APR technique that chooses repair operators by systematically learning from the features of the most common bugs in different programs, using machine learning. The wise selection of repair operators reduces the number of candidate patches. We compare our technique against Mutation repair, a test suite-based APR technique, using the Siemens suite. The experiment results indicate that our technique can fix 41 bugs while the baseline only repairs 22. In addition, Doctor Code can produce patches that do not exist in the search space of the three test suite-based techniques called SPR, Prophet, and SemFix. We also experiment with Doctor Code utilizing three buggy versions of a program called Space (9K LOC), to indicate its capability of repairing large-sized programs. In addition, we compare Doctor Code against 7 state-of-the-art APR tools like Elixir, using the Defects4j dataset. The experiment results indicate that our technique outperforms the other tools regarding the number of fixed bugs and overfitted patches.Comparing Doctor Code with RAPR as the baseline indicates that using machine learning reduces the number of overfitted patches and the time of patch production by 33.33% and 82.68%, respectively.
{"title":"Doctor Code: A Machine Learning-Based Approach to Program Repair","authors":"Sharmin Moosavi, Mojtaba Vahidi-Asl, Hassan Haghighi, Mohammad Rezaalipour","doi":"10.24200/sci.2023.54718.3884","DOIUrl":"https://doi.org/10.24200/sci.2023.54718.3884","url":null,"abstract":"To address the problems of automatic repair techniques, we present Doctor Code, a new APR technique that chooses repair operators by systematically learning from the features of the most common bugs in different programs, using machine learning. The wise selection of repair operators reduces the number of candidate patches. We compare our technique against Mutation repair, a test suite-based APR technique, using the Siemens suite. The experiment results indicate that our technique can fix 41 bugs while the baseline only repairs 22. In addition, Doctor Code can produce patches that do not exist in the search space of the three test suite-based techniques called SPR, Prophet, and SemFix. We also experiment with Doctor Code utilizing three buggy versions of a program called Space (9K LOC), to indicate its capability of repairing large-sized programs. In addition, we compare Doctor Code against 7 state-of-the-art APR tools like Elixir, using the Defects4j dataset. The experiment results indicate that our technique outperforms the other tools regarding the number of fixed bugs and overfitted patches.Comparing Doctor Code with RAPR as the baseline indicates that using machine learning reduces the number of overfitted patches and the time of patch production by 33.33% and 82.68%, respectively.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135841568","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 : 2023-07-18DOI: 10.24200/sci.2023.58193.5608
Ehsan Hassanzadeh, Zahra Amini
61 Predicting Origin-Destination demand has always been a challenging problem in transportation. 62 Conventional demand prediction methods mainly propose procedures for forecasting aggregated temporal 63 Origin-Destination (OD) flows. In other words, they are primarily unable to predict short-term demands. 64 Another limitation of these models is that they do not consider the impact of environmental conditions on 65 trip patterns. Furthermore, OD demand prediction requires two individual steps of modeling: trip 66 generation and trip distribution. This article presents a framework for predicting hourly OD flows using 67 the Neural Network. The proposed method utilizes trip patterns and environmental conditions for 68 predicting demands in single-step modeling. A case study on New York City Green Taxi 2018 trip data is 69 done to evaluate the method, and the results demonstrate that the network has reasonably accurate OD 70 flows predictions.
61 起点-目的地需求预测一直是交通领域的难题。62 传统的需求预测方法主要是提出预测时间性的起点-目的地（OD）总流量的程序。换言之，它们主要无法预测短期需求。64 这些模型的另一个局限是没有考虑环境条件对 65 行程模式的影响。此外，OD 需求预测需要两个单独的建模步骤：66 行程生成和行程分布。本文提出了一个利用 67 神经网络预测每小时 OD 流量的框架。所提出的方法利用了出行模式和环境条件，在单步建模中预测需求。为评估该方法，对纽约市绿色出租车 2018 年的出车数据进行了 69 案例研究，结果表明该网络能合理准确地预测 70 OD 流量。
{"title":"Using Neural Network for Predicting Hourly Origin-Destination Matrices from Trip Data and Environmental Information","authors":"Ehsan Hassanzadeh, Zahra Amini","doi":"10.24200/sci.2023.58193.5608","DOIUrl":"https://doi.org/10.24200/sci.2023.58193.5608","url":null,"abstract":"61 Predicting Origin-Destination demand has always been a challenging problem in transportation. 62 Conventional demand prediction methods mainly propose procedures for forecasting aggregated temporal 63 Origin-Destination (OD) flows. In other words, they are primarily unable to predict short-term demands. 64 Another limitation of these models is that they do not consider the impact of environmental conditions on 65 trip patterns. Furthermore, OD demand prediction requires two individual steps of modeling: trip 66 generation and trip distribution. This article presents a framework for predicting hourly OD flows using 67 the Neural Network. The proposed method utilizes trip patterns and environmental conditions for 68 predicting demands in single-step modeling. A case study on New York City Green Taxi 2018 trip data is 69 done to evaluate the method, and the results demonstrate that the network has reasonably accurate OD 70 flows predictions.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139358026","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 : 2023-07-18DOI: 10.24200/sci.2023.61034.7110
D. Bakhshesh, M. Farshi
For a real number 0 < γ < 180 ◦ , a geometric path P = ( p 1 , . . . , p n ) is called angle-monotone with width γ from p 1 to p n if there exists a closed wedge of angle γ such that every directed edge −−−−→ p i p i +1 of P lies inside the wedge whose apex is p i . A geometric graph G is called angle-monotone with width γ if for any two vertices p and q in G , there exists an angle-monotone path with width γ from p to q . In this paper, we show that for any integer k ≥ 1 and any i ∈ { 2 , 3 , 4 , 5 } , the theta-graph Θ 4 k + i on a set of points in convex position is angle-monotone with width 90 ◦ + iθ 4 , where θ = 360 ◦ 4 k + i . Moreover, we present two sets of points in the plane, one in convex position and the other in non-convex position, to show that for every 0 < γ < 180 ◦ , the graph Θ 4 is not angle-monotone with width γ . ,
对于实数 0 < γ < 180 ◦ ，如果存在一个角度为 γ 的封闭楔形，使得 P 的每条有向边 ----→ p i p i +1 都位于顶点为 p i 的楔形内，则从 p 1 到 p n 的几何路径 P = ( p 1 , ... , p n ) 称为宽度为 γ 的角单调路径。如果对于 G 中的任意两个顶点 p 和 q，存在一条宽度为 γ 的角单调路径从 p 到 q，则称几何图形 G 为宽度为 γ 的角单调图。在本文中，我们证明对于任意整数 k ≥ 1 和任意 i ∈ { 2 , 3 , 4 , 5 } ，θ 图 Θ 的宽度为 γ 。凸位置点集合上的θ图 Θ 4 k + i 是角度单调的，宽度为 90 ◦ + iθ 4，其中 θ = 360 ◦ 4 k + i 。此外，我们提出了平面上的两组点，一组处于凸位置，另一组处于非凸位置，以说明对于每 0 < γ < 180 ◦，图形 Θ 4 都不是宽度为 γ 的角单调图形。,
{"title":"Angle-monotonicity of theta-graphs for points in convex position","authors":"D. Bakhshesh, M. Farshi","doi":"10.24200/sci.2023.61034.7110","DOIUrl":"https://doi.org/10.24200/sci.2023.61034.7110","url":null,"abstract":"For a real number 0 < γ < 180 ◦ , a geometric path P = ( p 1 , . . . , p n ) is called angle-monotone with width γ from p 1 to p n if there exists a closed wedge of angle γ such that every directed edge −−−−→ p i p i +1 of P lies inside the wedge whose apex is p i . A geometric graph G is called angle-monotone with width γ if for any two vertices p and q in G , there exists an angle-monotone path with width γ from p to q . In this paper, we show that for any integer k ≥ 1 and any i ∈ { 2 , 3 , 4 , 5 } , the theta-graph Θ 4 k + i on a set of points in convex position is angle-monotone with width 90 ◦ + iθ 4 , where θ = 360 ◦ 4 k + i . Moreover, we present two sets of points in the plane, one in convex position and the other in non-convex position, to show that for every 0 < γ < 180 ◦ , the graph Θ 4 is not angle-monotone with width γ . ,","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139358462","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 : 2023-07-18DOI: 10.24200/sci.2023.61602.7395
M. Nalbant, S. Bağdatlı, A. Teki̇n
. Free vibration of stepped nanobeams was investigated using Eringen's nonlocal elasticity theory. Beam analysis is based on Bernoulli-Euler theory and nanoscale analysis is based on Eringen's nonlocal elasticity theory. The system boundary conditions were determined as simple-simple. The equations of motion of the system were obtained using Hamilton's principle. For the solution of the obtained state equations, a multi-time scale, which is one of the perturbation methods, was used. The results part of the study, it is aimed to observe the nano-size effect and the effects of the step state. For this purpose, the natural frequency values of the first three modes of the system were obtained for different non-local parameter values, step rates, and step positions. When the results were examined, it was determined that the non-local parameter value, step ratio, and natural frequency were inversely proportional to each other. In addition, to strengthen the accuracy of the results, the results obtained were compared with the results of other studies in the literature conducted under the specified conditions, and a perfect agreement was observed. The current beam model, on the other hand, could help design and manufacture ICs such as nano-sensors and nano-actuators.
{"title":"Free Vibrations Analysis of Stepped Nanobeams Using Nonlocal Elasticity Theory","authors":"M. Nalbant, S. Bağdatlı, A. Teki̇n","doi":"10.24200/sci.2023.61602.7395","DOIUrl":"https://doi.org/10.24200/sci.2023.61602.7395","url":null,"abstract":". Free vibration of stepped nanobeams was investigated using Eringen's nonlocal elasticity theory. Beam analysis is based on Bernoulli-Euler theory and nanoscale analysis is based on Eringen's nonlocal elasticity theory. The system boundary conditions were determined as simple-simple. The equations of motion of the system were obtained using Hamilton's principle. For the solution of the obtained state equations, a multi-time scale, which is one of the perturbation methods, was used. The results part of the study, it is aimed to observe the nano-size effect and the effects of the step state. For this purpose, the natural frequency values of the first three modes of the system were obtained for different non-local parameter values, step rates, and step positions. When the results were examined, it was determined that the non-local parameter value, step ratio, and natural frequency were inversely proportional to each other. In addition, to strengthen the accuracy of the results, the results obtained were compared with the results of other studies in the literature conducted under the specified conditions, and a perfect agreement was observed. The current beam model, on the other hand, could help design and manufacture ICs such as nano-sensors and nano-actuators.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139358193","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 : 2023-07-18DOI: 10.24200/sci.2023.60059.6574
N. Gupta, M. M. Kar, Arun Kumar Singh
In this article, for load frequency control(LFC) in power system an improved sine-cosine algorithm is proposed with 2-DOF-PID controller. To facilitate the inspection, a multi-area test system(three area) has been developed. Additionally, several physical restrictions have been taken into account while investigating practical power system analysis. For every scenario considered for the experiment, the suggested approach has been employed as the optimizer of parameter of the controller of LFC. 2-DOF-PID controllers has the ability to quickly reject disturbances without noticeably increasing overshoot in set point tracking, have been utilised as the controller of LFC. The PIDF and FOPID controllers has been compare with 2-DOF-PID controller to evaluate the usefulness of it. The simulation results of SCA, SSA, ALO, and PSO are some of the algorithm with which of the proposed modified algorithm were compared, in three distinct scenarios: disturbance in three areas, disturbance in two areas, and the final scenario with physical restrictions. Wilcoxon Sign Rank Test (WSRT) has been use for the statistical analysis and 20 separate times was carried out in order to further prove the supremacy of the suggested strategy.
{"title":"Statistical Analysis Based Load Frequency Control of multi-area system with Nonlinearities using 2-DOF-PID controller with Application of Improved Sine-Cosine Algorithm optimizer","authors":"N. Gupta, M. M. Kar, Arun Kumar Singh","doi":"10.24200/sci.2023.60059.6574","DOIUrl":"https://doi.org/10.24200/sci.2023.60059.6574","url":null,"abstract":"In this article, for load frequency control(LFC) in power system an improved sine-cosine algorithm is proposed with 2-DOF-PID controller. To facilitate the inspection, a multi-area test system(three area) has been developed. Additionally, several physical restrictions have been taken into account while investigating practical power system analysis. For every scenario considered for the experiment, the suggested approach has been employed as the optimizer of parameter of the controller of LFC. 2-DOF-PID controllers has the ability to quickly reject disturbances without noticeably increasing overshoot in set point tracking, have been utilised as the controller of LFC. The PIDF and FOPID controllers has been compare with 2-DOF-PID controller to evaluate the usefulness of it. The simulation results of SCA, SSA, ALO, and PSO are some of the algorithm with which of the proposed modified algorithm were compared, in three distinct scenarios: disturbance in three areas, disturbance in two areas, and the final scenario with physical restrictions. Wilcoxon Sign Rank Test (WSRT) has been use for the statistical analysis and 20 separate times was carried out in order to further prove the supremacy of the suggested strategy.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139357879","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 : 2023-07-18DOI: 10.24200/sci.2023.61637.7412
H. Sabahi, M. Vali, D. Shafie
9 Heart failure (HF) is a cardiac dysfunction disease with a high mortality rate that is mostly calculated via registry 10 data. The objective of this work was to predict in-hospital mortality in patients hospitalized with HF utilizing their 11 before-hospitalization registry data. The data include 3968 HF records extracted from Persian Registry Of cardio 12 Vascular diseasE (PROVE)/HF registry. We proposed a method that contains an imbalanced ensemble probabilistic 13 model which using registry data predicts HF patients who die during hospitalization from those who survive. The
{"title":"In-hospital mortality prediction model of heart failure patients using imbalanced registry data: A machine learning approach","authors":"H. Sabahi, M. Vali, D. Shafie","doi":"10.24200/sci.2023.61637.7412","DOIUrl":"https://doi.org/10.24200/sci.2023.61637.7412","url":null,"abstract":"9 Heart failure (HF) is a cardiac dysfunction disease with a high mortality rate that is mostly calculated via registry 10 data. The objective of this work was to predict in-hospital mortality in patients hospitalized with HF utilizing their 11 before-hospitalization registry data. The data include 3968 HF records extracted from Persian Registry Of cardio 12 Vascular diseasE (PROVE)/HF registry. We proposed a method that contains an imbalanced ensemble probabilistic 13 model which using registry data predicts HF patients who die during hospitalization from those who survive. The","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139358192","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 : 2023-07-18DOI: 10.24200/sci.2023.60251.6688
Mohammad Pourmehdi, Seyed Hossein Hosseinian-Kashani, M. Paydar, A. Divsalar
Agricultural activities have adverse effects on the environment by emitting greenhouse gases and consuming great deals of freshwater. In addition, fruits constitute a substantial part of agricultural products used for balancing diets. In particular, pomegranate is one of the most used products by people of different cultures. In this study, a multi-objective mathematical model was developed to balance sustainability dimensions by focusing on selecting the optimal cultivation process and determining the optimal material flows between pomegranate supply chain facilities. The proposed model maximizes the total profit and the number of created job opportunities due to cultivation process selection and the establishment of plants. It also addresses the environmental impacts by minimizing fertilizer, pesticide, and water consumption in pomegranate cultivation. The model also considers the reverse flow of pomegranate peel and seeds to recapture the value of these products, commonly known as waste. A real case in the Mazandaran province of Iran was considered for validating the developed model. Finally, comprehensive sensitivity analyses were performed on the influential factors of the problem, and managerial implications are presented.
{"title":"Sustainable pomegranate supply chain network design considering cultivation process and water consumption","authors":"Mohammad Pourmehdi, Seyed Hossein Hosseinian-Kashani, M. Paydar, A. Divsalar","doi":"10.24200/sci.2023.60251.6688","DOIUrl":"https://doi.org/10.24200/sci.2023.60251.6688","url":null,"abstract":"Agricultural activities have adverse effects on the environment by emitting greenhouse gases and consuming great deals of freshwater. In addition, fruits constitute a substantial part of agricultural products used for balancing diets. In particular, pomegranate is one of the most used products by people of different cultures. In this study, a multi-objective mathematical model was developed to balance sustainability dimensions by focusing on selecting the optimal cultivation process and determining the optimal material flows between pomegranate supply chain facilities. The proposed model maximizes the total profit and the number of created job opportunities due to cultivation process selection and the establishment of plants. It also addresses the environmental impacts by minimizing fertilizer, pesticide, and water consumption in pomegranate cultivation. The model also considers the reverse flow of pomegranate peel and seeds to recapture the value of these products, commonly known as waste. A real case in the Mazandaran province of Iran was considered for validating the developed model. Finally, comprehensive sensitivity analyses were performed on the influential factors of the problem, and managerial implications are presented.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139358051","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 : 2023-07-08DOI: 10.24200/sci.2023.57385.5213
G. Vishwakarma
In this manuscript, a generalized class of estimators has been developed for estimating a finite population means in ranked set sampling scheme. The expressions for bias and mean square error (MSE) of the proposed class of estimators have been derived up to the first order of approximation. Some estimators are shown to be a member of the proposed class. The proposed class of estimators has been compared through the MSE criterion over the other existing member estimators of the proposed class of estimators. The theoretical conditions are obtained under which the proposed class of estimators has performed better. Efficiency comparisons, empirical study, and simulation study also delineate the soundness of our proposed generalized class of the estimators under ranked
{"title":"Computing the population mean on the use of auxiliary information under ranked set sampling","authors":"G. Vishwakarma","doi":"10.24200/sci.2023.57385.5213","DOIUrl":"https://doi.org/10.24200/sci.2023.57385.5213","url":null,"abstract":"In this manuscript, a generalized class of estimators has been developed for estimating a finite population means in ranked set sampling scheme. The expressions for bias and mean square error (MSE) of the proposed class of estimators have been derived up to the first order of approximation. Some estimators are shown to be a member of the proposed class. The proposed class of estimators has been compared through the MSE criterion over the other existing member estimators of the proposed class of estimators. The theoretical conditions are obtained under which the proposed class of estimators has performed better. Efficiency comparisons, empirical study, and simulation study also delineate the soundness of our proposed generalized class of the estimators under ranked","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77719106","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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